Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/mm/page_alloc.c | |
3 | * | |
4 | * Manages the free list, the system allocates free pages here. | |
5 | * Note that kmalloc() lives in slab.c | |
6 | * | |
7 | * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds | |
8 | * Swap reorganised 29.12.95, Stephen Tweedie | |
9 | * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999 | |
10 | * Reshaped it to be a zoned allocator, Ingo Molnar, Red Hat, 1999 | |
11 | * Discontiguous memory support, Kanoj Sarcar, SGI, Nov 1999 | |
12 | * Zone balancing, Kanoj Sarcar, SGI, Jan 2000 | |
13 | * Per cpu hot/cold page lists, bulk allocation, Martin J. Bligh, Sept 2002 | |
14 | * (lots of bits borrowed from Ingo Molnar & Andrew Morton) | |
15 | */ | |
16 | ||
1da177e4 LT |
17 | #include <linux/stddef.h> |
18 | #include <linux/mm.h> | |
19 | #include <linux/swap.h> | |
20 | #include <linux/interrupt.h> | |
21 | #include <linux/pagemap.h> | |
10ed273f | 22 | #include <linux/jiffies.h> |
1da177e4 | 23 | #include <linux/bootmem.h> |
edbe7d23 | 24 | #include <linux/memblock.h> |
1da177e4 | 25 | #include <linux/compiler.h> |
9f158333 | 26 | #include <linux/kernel.h> |
b1eeab67 | 27 | #include <linux/kmemcheck.h> |
b8c73fc2 | 28 | #include <linux/kasan.h> |
1da177e4 LT |
29 | #include <linux/module.h> |
30 | #include <linux/suspend.h> | |
31 | #include <linux/pagevec.h> | |
32 | #include <linux/blkdev.h> | |
33 | #include <linux/slab.h> | |
a238ab5b | 34 | #include <linux/ratelimit.h> |
5a3135c2 | 35 | #include <linux/oom.h> |
1da177e4 LT |
36 | #include <linux/notifier.h> |
37 | #include <linux/topology.h> | |
38 | #include <linux/sysctl.h> | |
39 | #include <linux/cpu.h> | |
40 | #include <linux/cpuset.h> | |
bdc8cb98 | 41 | #include <linux/memory_hotplug.h> |
1da177e4 LT |
42 | #include <linux/nodemask.h> |
43 | #include <linux/vmalloc.h> | |
a6cccdc3 | 44 | #include <linux/vmstat.h> |
4be38e35 | 45 | #include <linux/mempolicy.h> |
4b94ffdc | 46 | #include <linux/memremap.h> |
6811378e | 47 | #include <linux/stop_machine.h> |
c713216d MG |
48 | #include <linux/sort.h> |
49 | #include <linux/pfn.h> | |
3fcfab16 | 50 | #include <linux/backing-dev.h> |
933e312e | 51 | #include <linux/fault-inject.h> |
a5d76b54 | 52 | #include <linux/page-isolation.h> |
eefa864b | 53 | #include <linux/page_ext.h> |
3ac7fe5a | 54 | #include <linux/debugobjects.h> |
dbb1f81c | 55 | #include <linux/kmemleak.h> |
56de7263 | 56 | #include <linux/compaction.h> |
0d3d062a | 57 | #include <trace/events/kmem.h> |
268bb0ce | 58 | #include <linux/prefetch.h> |
6e543d57 | 59 | #include <linux/mm_inline.h> |
041d3a8c | 60 | #include <linux/migrate.h> |
e30825f1 | 61 | #include <linux/page_ext.h> |
949f7ec5 | 62 | #include <linux/hugetlb.h> |
8bd75c77 | 63 | #include <linux/sched/rt.h> |
48c96a36 | 64 | #include <linux/page_owner.h> |
0e1cc95b | 65 | #include <linux/kthread.h> |
1da177e4 | 66 | |
7ee3d4e8 | 67 | #include <asm/sections.h> |
1da177e4 | 68 | #include <asm/tlbflush.h> |
ac924c60 | 69 | #include <asm/div64.h> |
1da177e4 LT |
70 | #include "internal.h" |
71 | ||
c8e251fa CS |
72 | /* prevent >1 _updater_ of zone percpu pageset ->high and ->batch fields */ |
73 | static DEFINE_MUTEX(pcp_batch_high_lock); | |
7cd2b0a3 | 74 | #define MIN_PERCPU_PAGELIST_FRACTION (8) |
c8e251fa | 75 | |
72812019 LS |
76 | #ifdef CONFIG_USE_PERCPU_NUMA_NODE_ID |
77 | DEFINE_PER_CPU(int, numa_node); | |
78 | EXPORT_PER_CPU_SYMBOL(numa_node); | |
79 | #endif | |
80 | ||
7aac7898 LS |
81 | #ifdef CONFIG_HAVE_MEMORYLESS_NODES |
82 | /* | |
83 | * N.B., Do NOT reference the '_numa_mem_' per cpu variable directly. | |
84 | * It will not be defined when CONFIG_HAVE_MEMORYLESS_NODES is not defined. | |
85 | * Use the accessor functions set_numa_mem(), numa_mem_id() and cpu_to_mem() | |
86 | * defined in <linux/topology.h>. | |
87 | */ | |
88 | DEFINE_PER_CPU(int, _numa_mem_); /* Kernel "local memory" node */ | |
89 | EXPORT_PER_CPU_SYMBOL(_numa_mem_); | |
ad2c8144 | 90 | int _node_numa_mem_[MAX_NUMNODES]; |
7aac7898 LS |
91 | #endif |
92 | ||
1da177e4 | 93 | /* |
13808910 | 94 | * Array of node states. |
1da177e4 | 95 | */ |
13808910 CL |
96 | nodemask_t node_states[NR_NODE_STATES] __read_mostly = { |
97 | [N_POSSIBLE] = NODE_MASK_ALL, | |
98 | [N_ONLINE] = { { [0] = 1UL } }, | |
99 | #ifndef CONFIG_NUMA | |
100 | [N_NORMAL_MEMORY] = { { [0] = 1UL } }, | |
101 | #ifdef CONFIG_HIGHMEM | |
102 | [N_HIGH_MEMORY] = { { [0] = 1UL } }, | |
20b2f52b LJ |
103 | #endif |
104 | #ifdef CONFIG_MOVABLE_NODE | |
105 | [N_MEMORY] = { { [0] = 1UL } }, | |
13808910 CL |
106 | #endif |
107 | [N_CPU] = { { [0] = 1UL } }, | |
108 | #endif /* NUMA */ | |
109 | }; | |
110 | EXPORT_SYMBOL(node_states); | |
111 | ||
c3d5f5f0 JL |
112 | /* Protect totalram_pages and zone->managed_pages */ |
113 | static DEFINE_SPINLOCK(managed_page_count_lock); | |
114 | ||
6c231b7b | 115 | unsigned long totalram_pages __read_mostly; |
cb45b0e9 | 116 | unsigned long totalreserve_pages __read_mostly; |
e48322ab | 117 | unsigned long totalcma_pages __read_mostly; |
ab8fabd4 | 118 | |
1b76b02f | 119 | int percpu_pagelist_fraction; |
dcce284a | 120 | gfp_t gfp_allowed_mask __read_mostly = GFP_BOOT_MASK; |
1da177e4 | 121 | |
bb14c2c7 VB |
122 | /* |
123 | * A cached value of the page's pageblock's migratetype, used when the page is | |
124 | * put on a pcplist. Used to avoid the pageblock migratetype lookup when | |
125 | * freeing from pcplists in most cases, at the cost of possibly becoming stale. | |
126 | * Also the migratetype set in the page does not necessarily match the pcplist | |
127 | * index, e.g. page might have MIGRATE_CMA set but be on a pcplist with any | |
128 | * other index - this ensures that it will be put on the correct CMA freelist. | |
129 | */ | |
130 | static inline int get_pcppage_migratetype(struct page *page) | |
131 | { | |
132 | return page->index; | |
133 | } | |
134 | ||
135 | static inline void set_pcppage_migratetype(struct page *page, int migratetype) | |
136 | { | |
137 | page->index = migratetype; | |
138 | } | |
139 | ||
452aa699 RW |
140 | #ifdef CONFIG_PM_SLEEP |
141 | /* | |
142 | * The following functions are used by the suspend/hibernate code to temporarily | |
143 | * change gfp_allowed_mask in order to avoid using I/O during memory allocations | |
144 | * while devices are suspended. To avoid races with the suspend/hibernate code, | |
145 | * they should always be called with pm_mutex held (gfp_allowed_mask also should | |
146 | * only be modified with pm_mutex held, unless the suspend/hibernate code is | |
147 | * guaranteed not to run in parallel with that modification). | |
148 | */ | |
c9e664f1 RW |
149 | |
150 | static gfp_t saved_gfp_mask; | |
151 | ||
152 | void pm_restore_gfp_mask(void) | |
452aa699 RW |
153 | { |
154 | WARN_ON(!mutex_is_locked(&pm_mutex)); | |
c9e664f1 RW |
155 | if (saved_gfp_mask) { |
156 | gfp_allowed_mask = saved_gfp_mask; | |
157 | saved_gfp_mask = 0; | |
158 | } | |
452aa699 RW |
159 | } |
160 | ||
c9e664f1 | 161 | void pm_restrict_gfp_mask(void) |
452aa699 | 162 | { |
452aa699 | 163 | WARN_ON(!mutex_is_locked(&pm_mutex)); |
c9e664f1 RW |
164 | WARN_ON(saved_gfp_mask); |
165 | saved_gfp_mask = gfp_allowed_mask; | |
d0164adc | 166 | gfp_allowed_mask &= ~(__GFP_IO | __GFP_FS); |
452aa699 | 167 | } |
f90ac398 MG |
168 | |
169 | bool pm_suspended_storage(void) | |
170 | { | |
d0164adc | 171 | if ((gfp_allowed_mask & (__GFP_IO | __GFP_FS)) == (__GFP_IO | __GFP_FS)) |
f90ac398 MG |
172 | return false; |
173 | return true; | |
174 | } | |
452aa699 RW |
175 | #endif /* CONFIG_PM_SLEEP */ |
176 | ||
d9c23400 | 177 | #ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE |
d00181b9 | 178 | unsigned int pageblock_order __read_mostly; |
d9c23400 MG |
179 | #endif |
180 | ||
d98c7a09 | 181 | static void __free_pages_ok(struct page *page, unsigned int order); |
a226f6c8 | 182 | |
1da177e4 LT |
183 | /* |
184 | * results with 256, 32 in the lowmem_reserve sysctl: | |
185 | * 1G machine -> (16M dma, 800M-16M normal, 1G-800M high) | |
186 | * 1G machine -> (16M dma, 784M normal, 224M high) | |
187 | * NORMAL allocation will leave 784M/256 of ram reserved in the ZONE_DMA | |
188 | * HIGHMEM allocation will leave 224M/32 of ram reserved in ZONE_NORMAL | |
84109e15 | 189 | * HIGHMEM allocation will leave (224M+784M)/256 of ram reserved in ZONE_DMA |
a2f1b424 AK |
190 | * |
191 | * TBD: should special case ZONE_DMA32 machines here - in those we normally | |
192 | * don't need any ZONE_NORMAL reservation | |
1da177e4 | 193 | */ |
2f1b6248 | 194 | int sysctl_lowmem_reserve_ratio[MAX_NR_ZONES-1] = { |
4b51d669 | 195 | #ifdef CONFIG_ZONE_DMA |
2f1b6248 | 196 | 256, |
4b51d669 | 197 | #endif |
fb0e7942 | 198 | #ifdef CONFIG_ZONE_DMA32 |
2f1b6248 | 199 | 256, |
fb0e7942 | 200 | #endif |
e53ef38d | 201 | #ifdef CONFIG_HIGHMEM |
2a1e274a | 202 | 32, |
e53ef38d | 203 | #endif |
2a1e274a | 204 | 32, |
2f1b6248 | 205 | }; |
1da177e4 LT |
206 | |
207 | EXPORT_SYMBOL(totalram_pages); | |
1da177e4 | 208 | |
15ad7cdc | 209 | static char * const zone_names[MAX_NR_ZONES] = { |
4b51d669 | 210 | #ifdef CONFIG_ZONE_DMA |
2f1b6248 | 211 | "DMA", |
4b51d669 | 212 | #endif |
fb0e7942 | 213 | #ifdef CONFIG_ZONE_DMA32 |
2f1b6248 | 214 | "DMA32", |
fb0e7942 | 215 | #endif |
2f1b6248 | 216 | "Normal", |
e53ef38d | 217 | #ifdef CONFIG_HIGHMEM |
2a1e274a | 218 | "HighMem", |
e53ef38d | 219 | #endif |
2a1e274a | 220 | "Movable", |
033fbae9 DW |
221 | #ifdef CONFIG_ZONE_DEVICE |
222 | "Device", | |
223 | #endif | |
2f1b6248 CL |
224 | }; |
225 | ||
60f30350 VB |
226 | char * const migratetype_names[MIGRATE_TYPES] = { |
227 | "Unmovable", | |
228 | "Movable", | |
229 | "Reclaimable", | |
230 | "HighAtomic", | |
231 | #ifdef CONFIG_CMA | |
232 | "CMA", | |
233 | #endif | |
234 | #ifdef CONFIG_MEMORY_ISOLATION | |
235 | "Isolate", | |
236 | #endif | |
237 | }; | |
238 | ||
f1e61557 KS |
239 | compound_page_dtor * const compound_page_dtors[] = { |
240 | NULL, | |
241 | free_compound_page, | |
242 | #ifdef CONFIG_HUGETLB_PAGE | |
243 | free_huge_page, | |
244 | #endif | |
9a982250 KS |
245 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
246 | free_transhuge_page, | |
247 | #endif | |
f1e61557 KS |
248 | }; |
249 | ||
1da177e4 | 250 | int min_free_kbytes = 1024; |
42aa83cb | 251 | int user_min_free_kbytes = -1; |
795ae7a0 | 252 | int watermark_scale_factor = 10; |
1da177e4 | 253 | |
2c85f51d JB |
254 | static unsigned long __meminitdata nr_kernel_pages; |
255 | static unsigned long __meminitdata nr_all_pages; | |
a3142c8e | 256 | static unsigned long __meminitdata dma_reserve; |
1da177e4 | 257 | |
0ee332c1 TH |
258 | #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP |
259 | static unsigned long __meminitdata arch_zone_lowest_possible_pfn[MAX_NR_ZONES]; | |
260 | static unsigned long __meminitdata arch_zone_highest_possible_pfn[MAX_NR_ZONES]; | |
261 | static unsigned long __initdata required_kernelcore; | |
262 | static unsigned long __initdata required_movablecore; | |
263 | static unsigned long __meminitdata zone_movable_pfn[MAX_NUMNODES]; | |
342332e6 | 264 | static bool mirrored_kernelcore; |
0ee332c1 TH |
265 | |
266 | /* movable_zone is the "real" zone pages in ZONE_MOVABLE are taken from */ | |
267 | int movable_zone; | |
268 | EXPORT_SYMBOL(movable_zone); | |
269 | #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ | |
c713216d | 270 | |
418508c1 MS |
271 | #if MAX_NUMNODES > 1 |
272 | int nr_node_ids __read_mostly = MAX_NUMNODES; | |
62bc62a8 | 273 | int nr_online_nodes __read_mostly = 1; |
418508c1 | 274 | EXPORT_SYMBOL(nr_node_ids); |
62bc62a8 | 275 | EXPORT_SYMBOL(nr_online_nodes); |
418508c1 MS |
276 | #endif |
277 | ||
9ef9acb0 MG |
278 | int page_group_by_mobility_disabled __read_mostly; |
279 | ||
3a80a7fa MG |
280 | #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT |
281 | static inline void reset_deferred_meminit(pg_data_t *pgdat) | |
282 | { | |
283 | pgdat->first_deferred_pfn = ULONG_MAX; | |
284 | } | |
285 | ||
286 | /* Returns true if the struct page for the pfn is uninitialised */ | |
0e1cc95b | 287 | static inline bool __meminit early_page_uninitialised(unsigned long pfn) |
3a80a7fa | 288 | { |
ae026b2a | 289 | if (pfn >= NODE_DATA(early_pfn_to_nid(pfn))->first_deferred_pfn) |
3a80a7fa MG |
290 | return true; |
291 | ||
292 | return false; | |
293 | } | |
294 | ||
7e18adb4 MG |
295 | static inline bool early_page_nid_uninitialised(unsigned long pfn, int nid) |
296 | { | |
297 | if (pfn >= NODE_DATA(nid)->first_deferred_pfn) | |
298 | return true; | |
299 | ||
300 | return false; | |
301 | } | |
302 | ||
3a80a7fa MG |
303 | /* |
304 | * Returns false when the remaining initialisation should be deferred until | |
305 | * later in the boot cycle when it can be parallelised. | |
306 | */ | |
307 | static inline bool update_defer_init(pg_data_t *pgdat, | |
308 | unsigned long pfn, unsigned long zone_end, | |
309 | unsigned long *nr_initialised) | |
310 | { | |
987b3095 LZ |
311 | unsigned long max_initialise; |
312 | ||
3a80a7fa MG |
313 | /* Always populate low zones for address-contrained allocations */ |
314 | if (zone_end < pgdat_end_pfn(pgdat)) | |
315 | return true; | |
987b3095 LZ |
316 | /* |
317 | * Initialise at least 2G of a node but also take into account that | |
318 | * two large system hashes that can take up 1GB for 0.25TB/node. | |
319 | */ | |
320 | max_initialise = max(2UL << (30 - PAGE_SHIFT), | |
321 | (pgdat->node_spanned_pages >> 8)); | |
3a80a7fa | 322 | |
3a80a7fa | 323 | (*nr_initialised)++; |
987b3095 | 324 | if ((*nr_initialised > max_initialise) && |
3a80a7fa MG |
325 | (pfn & (PAGES_PER_SECTION - 1)) == 0) { |
326 | pgdat->first_deferred_pfn = pfn; | |
327 | return false; | |
328 | } | |
329 | ||
330 | return true; | |
331 | } | |
332 | #else | |
333 | static inline void reset_deferred_meminit(pg_data_t *pgdat) | |
334 | { | |
335 | } | |
336 | ||
337 | static inline bool early_page_uninitialised(unsigned long pfn) | |
338 | { | |
339 | return false; | |
340 | } | |
341 | ||
7e18adb4 MG |
342 | static inline bool early_page_nid_uninitialised(unsigned long pfn, int nid) |
343 | { | |
344 | return false; | |
345 | } | |
346 | ||
3a80a7fa MG |
347 | static inline bool update_defer_init(pg_data_t *pgdat, |
348 | unsigned long pfn, unsigned long zone_end, | |
349 | unsigned long *nr_initialised) | |
350 | { | |
351 | return true; | |
352 | } | |
353 | #endif | |
354 | ||
0b423ca2 MG |
355 | /* Return a pointer to the bitmap storing bits affecting a block of pages */ |
356 | static inline unsigned long *get_pageblock_bitmap(struct page *page, | |
357 | unsigned long pfn) | |
358 | { | |
359 | #ifdef CONFIG_SPARSEMEM | |
360 | return __pfn_to_section(pfn)->pageblock_flags; | |
361 | #else | |
362 | return page_zone(page)->pageblock_flags; | |
363 | #endif /* CONFIG_SPARSEMEM */ | |
364 | } | |
365 | ||
366 | static inline int pfn_to_bitidx(struct page *page, unsigned long pfn) | |
367 | { | |
368 | #ifdef CONFIG_SPARSEMEM | |
369 | pfn &= (PAGES_PER_SECTION-1); | |
370 | return (pfn >> pageblock_order) * NR_PAGEBLOCK_BITS; | |
371 | #else | |
372 | pfn = pfn - round_down(page_zone(page)->zone_start_pfn, pageblock_nr_pages); | |
373 | return (pfn >> pageblock_order) * NR_PAGEBLOCK_BITS; | |
374 | #endif /* CONFIG_SPARSEMEM */ | |
375 | } | |
376 | ||
377 | /** | |
378 | * get_pfnblock_flags_mask - Return the requested group of flags for the pageblock_nr_pages block of pages | |
379 | * @page: The page within the block of interest | |
380 | * @pfn: The target page frame number | |
381 | * @end_bitidx: The last bit of interest to retrieve | |
382 | * @mask: mask of bits that the caller is interested in | |
383 | * | |
384 | * Return: pageblock_bits flags | |
385 | */ | |
386 | static __always_inline unsigned long __get_pfnblock_flags_mask(struct page *page, | |
387 | unsigned long pfn, | |
388 | unsigned long end_bitidx, | |
389 | unsigned long mask) | |
390 | { | |
391 | unsigned long *bitmap; | |
392 | unsigned long bitidx, word_bitidx; | |
393 | unsigned long word; | |
394 | ||
395 | bitmap = get_pageblock_bitmap(page, pfn); | |
396 | bitidx = pfn_to_bitidx(page, pfn); | |
397 | word_bitidx = bitidx / BITS_PER_LONG; | |
398 | bitidx &= (BITS_PER_LONG-1); | |
399 | ||
400 | word = bitmap[word_bitidx]; | |
401 | bitidx += end_bitidx; | |
402 | return (word >> (BITS_PER_LONG - bitidx - 1)) & mask; | |
403 | } | |
404 | ||
405 | unsigned long get_pfnblock_flags_mask(struct page *page, unsigned long pfn, | |
406 | unsigned long end_bitidx, | |
407 | unsigned long mask) | |
408 | { | |
409 | return __get_pfnblock_flags_mask(page, pfn, end_bitidx, mask); | |
410 | } | |
411 | ||
412 | static __always_inline int get_pfnblock_migratetype(struct page *page, unsigned long pfn) | |
413 | { | |
414 | return __get_pfnblock_flags_mask(page, pfn, PB_migrate_end, MIGRATETYPE_MASK); | |
415 | } | |
416 | ||
417 | /** | |
418 | * set_pfnblock_flags_mask - Set the requested group of flags for a pageblock_nr_pages block of pages | |
419 | * @page: The page within the block of interest | |
420 | * @flags: The flags to set | |
421 | * @pfn: The target page frame number | |
422 | * @end_bitidx: The last bit of interest | |
423 | * @mask: mask of bits that the caller is interested in | |
424 | */ | |
425 | void set_pfnblock_flags_mask(struct page *page, unsigned long flags, | |
426 | unsigned long pfn, | |
427 | unsigned long end_bitidx, | |
428 | unsigned long mask) | |
429 | { | |
430 | unsigned long *bitmap; | |
431 | unsigned long bitidx, word_bitidx; | |
432 | unsigned long old_word, word; | |
433 | ||
434 | BUILD_BUG_ON(NR_PAGEBLOCK_BITS != 4); | |
435 | ||
436 | bitmap = get_pageblock_bitmap(page, pfn); | |
437 | bitidx = pfn_to_bitidx(page, pfn); | |
438 | word_bitidx = bitidx / BITS_PER_LONG; | |
439 | bitidx &= (BITS_PER_LONG-1); | |
440 | ||
441 | VM_BUG_ON_PAGE(!zone_spans_pfn(page_zone(page), pfn), page); | |
442 | ||
443 | bitidx += end_bitidx; | |
444 | mask <<= (BITS_PER_LONG - bitidx - 1); | |
445 | flags <<= (BITS_PER_LONG - bitidx - 1); | |
446 | ||
447 | word = READ_ONCE(bitmap[word_bitidx]); | |
448 | for (;;) { | |
449 | old_word = cmpxchg(&bitmap[word_bitidx], word, (word & ~mask) | flags); | |
450 | if (word == old_word) | |
451 | break; | |
452 | word = old_word; | |
453 | } | |
454 | } | |
3a80a7fa | 455 | |
ee6f509c | 456 | void set_pageblock_migratetype(struct page *page, int migratetype) |
b2a0ac88 | 457 | { |
5d0f3f72 KM |
458 | if (unlikely(page_group_by_mobility_disabled && |
459 | migratetype < MIGRATE_PCPTYPES)) | |
49255c61 MG |
460 | migratetype = MIGRATE_UNMOVABLE; |
461 | ||
b2a0ac88 MG |
462 | set_pageblock_flags_group(page, (unsigned long)migratetype, |
463 | PB_migrate, PB_migrate_end); | |
464 | } | |
465 | ||
13e7444b | 466 | #ifdef CONFIG_DEBUG_VM |
c6a57e19 | 467 | static int page_outside_zone_boundaries(struct zone *zone, struct page *page) |
1da177e4 | 468 | { |
bdc8cb98 DH |
469 | int ret = 0; |
470 | unsigned seq; | |
471 | unsigned long pfn = page_to_pfn(page); | |
b5e6a5a2 | 472 | unsigned long sp, start_pfn; |
c6a57e19 | 473 | |
bdc8cb98 DH |
474 | do { |
475 | seq = zone_span_seqbegin(zone); | |
b5e6a5a2 CS |
476 | start_pfn = zone->zone_start_pfn; |
477 | sp = zone->spanned_pages; | |
108bcc96 | 478 | if (!zone_spans_pfn(zone, pfn)) |
bdc8cb98 DH |
479 | ret = 1; |
480 | } while (zone_span_seqretry(zone, seq)); | |
481 | ||
b5e6a5a2 | 482 | if (ret) |
613813e8 DH |
483 | pr_err("page 0x%lx outside node %d zone %s [ 0x%lx - 0x%lx ]\n", |
484 | pfn, zone_to_nid(zone), zone->name, | |
485 | start_pfn, start_pfn + sp); | |
b5e6a5a2 | 486 | |
bdc8cb98 | 487 | return ret; |
c6a57e19 DH |
488 | } |
489 | ||
490 | static int page_is_consistent(struct zone *zone, struct page *page) | |
491 | { | |
14e07298 | 492 | if (!pfn_valid_within(page_to_pfn(page))) |
c6a57e19 | 493 | return 0; |
1da177e4 | 494 | if (zone != page_zone(page)) |
c6a57e19 DH |
495 | return 0; |
496 | ||
497 | return 1; | |
498 | } | |
499 | /* | |
500 | * Temporary debugging check for pages not lying within a given zone. | |
501 | */ | |
502 | static int bad_range(struct zone *zone, struct page *page) | |
503 | { | |
504 | if (page_outside_zone_boundaries(zone, page)) | |
1da177e4 | 505 | return 1; |
c6a57e19 DH |
506 | if (!page_is_consistent(zone, page)) |
507 | return 1; | |
508 | ||
1da177e4 LT |
509 | return 0; |
510 | } | |
13e7444b NP |
511 | #else |
512 | static inline int bad_range(struct zone *zone, struct page *page) | |
513 | { | |
514 | return 0; | |
515 | } | |
516 | #endif | |
517 | ||
d230dec1 KS |
518 | static void bad_page(struct page *page, const char *reason, |
519 | unsigned long bad_flags) | |
1da177e4 | 520 | { |
d936cf9b HD |
521 | static unsigned long resume; |
522 | static unsigned long nr_shown; | |
523 | static unsigned long nr_unshown; | |
524 | ||
525 | /* | |
526 | * Allow a burst of 60 reports, then keep quiet for that minute; | |
527 | * or allow a steady drip of one report per second. | |
528 | */ | |
529 | if (nr_shown == 60) { | |
530 | if (time_before(jiffies, resume)) { | |
531 | nr_unshown++; | |
532 | goto out; | |
533 | } | |
534 | if (nr_unshown) { | |
ff8e8116 | 535 | pr_alert( |
1e9e6365 | 536 | "BUG: Bad page state: %lu messages suppressed\n", |
d936cf9b HD |
537 | nr_unshown); |
538 | nr_unshown = 0; | |
539 | } | |
540 | nr_shown = 0; | |
541 | } | |
542 | if (nr_shown++ == 0) | |
543 | resume = jiffies + 60 * HZ; | |
544 | ||
ff8e8116 | 545 | pr_alert("BUG: Bad page state in process %s pfn:%05lx\n", |
3dc14741 | 546 | current->comm, page_to_pfn(page)); |
ff8e8116 VB |
547 | __dump_page(page, reason); |
548 | bad_flags &= page->flags; | |
549 | if (bad_flags) | |
550 | pr_alert("bad because of flags: %#lx(%pGp)\n", | |
551 | bad_flags, &bad_flags); | |
4e462112 | 552 | dump_page_owner(page); |
3dc14741 | 553 | |
4f31888c | 554 | print_modules(); |
1da177e4 | 555 | dump_stack(); |
d936cf9b | 556 | out: |
8cc3b392 | 557 | /* Leave bad fields for debug, except PageBuddy could make trouble */ |
22b751c3 | 558 | page_mapcount_reset(page); /* remove PageBuddy */ |
373d4d09 | 559 | add_taint(TAINT_BAD_PAGE, LOCKDEP_NOW_UNRELIABLE); |
1da177e4 LT |
560 | } |
561 | ||
1da177e4 LT |
562 | /* |
563 | * Higher-order pages are called "compound pages". They are structured thusly: | |
564 | * | |
1d798ca3 | 565 | * The first PAGE_SIZE page is called the "head page" and have PG_head set. |
1da177e4 | 566 | * |
1d798ca3 KS |
567 | * The remaining PAGE_SIZE pages are called "tail pages". PageTail() is encoded |
568 | * in bit 0 of page->compound_head. The rest of bits is pointer to head page. | |
1da177e4 | 569 | * |
1d798ca3 KS |
570 | * The first tail page's ->compound_dtor holds the offset in array of compound |
571 | * page destructors. See compound_page_dtors. | |
1da177e4 | 572 | * |
1d798ca3 | 573 | * The first tail page's ->compound_order holds the order of allocation. |
41d78ba5 | 574 | * This usage means that zero-order pages may not be compound. |
1da177e4 | 575 | */ |
d98c7a09 | 576 | |
9a982250 | 577 | void free_compound_page(struct page *page) |
d98c7a09 | 578 | { |
d85f3385 | 579 | __free_pages_ok(page, compound_order(page)); |
d98c7a09 HD |
580 | } |
581 | ||
d00181b9 | 582 | void prep_compound_page(struct page *page, unsigned int order) |
18229df5 AW |
583 | { |
584 | int i; | |
585 | int nr_pages = 1 << order; | |
586 | ||
f1e61557 | 587 | set_compound_page_dtor(page, COMPOUND_PAGE_DTOR); |
18229df5 AW |
588 | set_compound_order(page, order); |
589 | __SetPageHead(page); | |
590 | for (i = 1; i < nr_pages; i++) { | |
591 | struct page *p = page + i; | |
58a84aa9 | 592 | set_page_count(p, 0); |
1c290f64 | 593 | p->mapping = TAIL_MAPPING; |
1d798ca3 | 594 | set_compound_head(p, page); |
18229df5 | 595 | } |
53f9263b | 596 | atomic_set(compound_mapcount_ptr(page), -1); |
18229df5 AW |
597 | } |
598 | ||
c0a32fc5 SG |
599 | #ifdef CONFIG_DEBUG_PAGEALLOC |
600 | unsigned int _debug_guardpage_minorder; | |
ea6eabb0 CB |
601 | bool _debug_pagealloc_enabled __read_mostly |
602 | = IS_ENABLED(CONFIG_DEBUG_PAGEALLOC_ENABLE_DEFAULT); | |
505f6d22 | 603 | EXPORT_SYMBOL(_debug_pagealloc_enabled); |
e30825f1 JK |
604 | bool _debug_guardpage_enabled __read_mostly; |
605 | ||
031bc574 JK |
606 | static int __init early_debug_pagealloc(char *buf) |
607 | { | |
608 | if (!buf) | |
609 | return -EINVAL; | |
2a138dc7 | 610 | return kstrtobool(buf, &_debug_pagealloc_enabled); |
031bc574 JK |
611 | } |
612 | early_param("debug_pagealloc", early_debug_pagealloc); | |
613 | ||
e30825f1 JK |
614 | static bool need_debug_guardpage(void) |
615 | { | |
031bc574 JK |
616 | /* If we don't use debug_pagealloc, we don't need guard page */ |
617 | if (!debug_pagealloc_enabled()) | |
618 | return false; | |
619 | ||
e30825f1 JK |
620 | return true; |
621 | } | |
622 | ||
623 | static void init_debug_guardpage(void) | |
624 | { | |
031bc574 JK |
625 | if (!debug_pagealloc_enabled()) |
626 | return; | |
627 | ||
e30825f1 JK |
628 | _debug_guardpage_enabled = true; |
629 | } | |
630 | ||
631 | struct page_ext_operations debug_guardpage_ops = { | |
632 | .need = need_debug_guardpage, | |
633 | .init = init_debug_guardpage, | |
634 | }; | |
c0a32fc5 SG |
635 | |
636 | static int __init debug_guardpage_minorder_setup(char *buf) | |
637 | { | |
638 | unsigned long res; | |
639 | ||
640 | if (kstrtoul(buf, 10, &res) < 0 || res > MAX_ORDER / 2) { | |
1170532b | 641 | pr_err("Bad debug_guardpage_minorder value\n"); |
c0a32fc5 SG |
642 | return 0; |
643 | } | |
644 | _debug_guardpage_minorder = res; | |
1170532b | 645 | pr_info("Setting debug_guardpage_minorder to %lu\n", res); |
c0a32fc5 SG |
646 | return 0; |
647 | } | |
648 | __setup("debug_guardpage_minorder=", debug_guardpage_minorder_setup); | |
649 | ||
2847cf95 JK |
650 | static inline void set_page_guard(struct zone *zone, struct page *page, |
651 | unsigned int order, int migratetype) | |
c0a32fc5 | 652 | { |
e30825f1 JK |
653 | struct page_ext *page_ext; |
654 | ||
655 | if (!debug_guardpage_enabled()) | |
656 | return; | |
657 | ||
658 | page_ext = lookup_page_ext(page); | |
659 | __set_bit(PAGE_EXT_DEBUG_GUARD, &page_ext->flags); | |
660 | ||
2847cf95 JK |
661 | INIT_LIST_HEAD(&page->lru); |
662 | set_page_private(page, order); | |
663 | /* Guard pages are not available for any usage */ | |
664 | __mod_zone_freepage_state(zone, -(1 << order), migratetype); | |
c0a32fc5 SG |
665 | } |
666 | ||
2847cf95 JK |
667 | static inline void clear_page_guard(struct zone *zone, struct page *page, |
668 | unsigned int order, int migratetype) | |
c0a32fc5 | 669 | { |
e30825f1 JK |
670 | struct page_ext *page_ext; |
671 | ||
672 | if (!debug_guardpage_enabled()) | |
673 | return; | |
674 | ||
675 | page_ext = lookup_page_ext(page); | |
676 | __clear_bit(PAGE_EXT_DEBUG_GUARD, &page_ext->flags); | |
677 | ||
2847cf95 JK |
678 | set_page_private(page, 0); |
679 | if (!is_migrate_isolate(migratetype)) | |
680 | __mod_zone_freepage_state(zone, (1 << order), migratetype); | |
c0a32fc5 SG |
681 | } |
682 | #else | |
e30825f1 | 683 | struct page_ext_operations debug_guardpage_ops = { NULL, }; |
2847cf95 JK |
684 | static inline void set_page_guard(struct zone *zone, struct page *page, |
685 | unsigned int order, int migratetype) {} | |
686 | static inline void clear_page_guard(struct zone *zone, struct page *page, | |
687 | unsigned int order, int migratetype) {} | |
c0a32fc5 SG |
688 | #endif |
689 | ||
7aeb09f9 | 690 | static inline void set_page_order(struct page *page, unsigned int order) |
6aa3001b | 691 | { |
4c21e2f2 | 692 | set_page_private(page, order); |
676165a8 | 693 | __SetPageBuddy(page); |
1da177e4 LT |
694 | } |
695 | ||
696 | static inline void rmv_page_order(struct page *page) | |
697 | { | |
676165a8 | 698 | __ClearPageBuddy(page); |
4c21e2f2 | 699 | set_page_private(page, 0); |
1da177e4 LT |
700 | } |
701 | ||
1da177e4 LT |
702 | /* |
703 | * This function checks whether a page is free && is the buddy | |
704 | * we can do coalesce a page and its buddy if | |
13e7444b | 705 | * (a) the buddy is not in a hole && |
676165a8 | 706 | * (b) the buddy is in the buddy system && |
cb2b95e1 AW |
707 | * (c) a page and its buddy have the same order && |
708 | * (d) a page and its buddy are in the same zone. | |
676165a8 | 709 | * |
cf6fe945 WSH |
710 | * For recording whether a page is in the buddy system, we set ->_mapcount |
711 | * PAGE_BUDDY_MAPCOUNT_VALUE. | |
712 | * Setting, clearing, and testing _mapcount PAGE_BUDDY_MAPCOUNT_VALUE is | |
713 | * serialized by zone->lock. | |
1da177e4 | 714 | * |
676165a8 | 715 | * For recording page's order, we use page_private(page). |
1da177e4 | 716 | */ |
cb2b95e1 | 717 | static inline int page_is_buddy(struct page *page, struct page *buddy, |
7aeb09f9 | 718 | unsigned int order) |
1da177e4 | 719 | { |
14e07298 | 720 | if (!pfn_valid_within(page_to_pfn(buddy))) |
13e7444b | 721 | return 0; |
13e7444b | 722 | |
c0a32fc5 | 723 | if (page_is_guard(buddy) && page_order(buddy) == order) { |
d34c5fa0 MG |
724 | if (page_zone_id(page) != page_zone_id(buddy)) |
725 | return 0; | |
726 | ||
4c5018ce WY |
727 | VM_BUG_ON_PAGE(page_count(buddy) != 0, buddy); |
728 | ||
c0a32fc5 SG |
729 | return 1; |
730 | } | |
731 | ||
cb2b95e1 | 732 | if (PageBuddy(buddy) && page_order(buddy) == order) { |
d34c5fa0 MG |
733 | /* |
734 | * zone check is done late to avoid uselessly | |
735 | * calculating zone/node ids for pages that could | |
736 | * never merge. | |
737 | */ | |
738 | if (page_zone_id(page) != page_zone_id(buddy)) | |
739 | return 0; | |
740 | ||
4c5018ce WY |
741 | VM_BUG_ON_PAGE(page_count(buddy) != 0, buddy); |
742 | ||
6aa3001b | 743 | return 1; |
676165a8 | 744 | } |
6aa3001b | 745 | return 0; |
1da177e4 LT |
746 | } |
747 | ||
748 | /* | |
749 | * Freeing function for a buddy system allocator. | |
750 | * | |
751 | * The concept of a buddy system is to maintain direct-mapped table | |
752 | * (containing bit values) for memory blocks of various "orders". | |
753 | * The bottom level table contains the map for the smallest allocatable | |
754 | * units of memory (here, pages), and each level above it describes | |
755 | * pairs of units from the levels below, hence, "buddies". | |
756 | * At a high level, all that happens here is marking the table entry | |
757 | * at the bottom level available, and propagating the changes upward | |
758 | * as necessary, plus some accounting needed to play nicely with other | |
759 | * parts of the VM system. | |
760 | * At each level, we keep a list of pages, which are heads of continuous | |
cf6fe945 WSH |
761 | * free pages of length of (1 << order) and marked with _mapcount |
762 | * PAGE_BUDDY_MAPCOUNT_VALUE. Page's order is recorded in page_private(page) | |
763 | * field. | |
1da177e4 | 764 | * So when we are allocating or freeing one, we can derive the state of the |
5f63b720 MN |
765 | * other. That is, if we allocate a small block, and both were |
766 | * free, the remainder of the region must be split into blocks. | |
1da177e4 | 767 | * If a block is freed, and its buddy is also free, then this |
5f63b720 | 768 | * triggers coalescing into a block of larger size. |
1da177e4 | 769 | * |
6d49e352 | 770 | * -- nyc |
1da177e4 LT |
771 | */ |
772 | ||
48db57f8 | 773 | static inline void __free_one_page(struct page *page, |
dc4b0caf | 774 | unsigned long pfn, |
ed0ae21d MG |
775 | struct zone *zone, unsigned int order, |
776 | int migratetype) | |
1da177e4 LT |
777 | { |
778 | unsigned long page_idx; | |
6dda9d55 | 779 | unsigned long combined_idx; |
43506fad | 780 | unsigned long uninitialized_var(buddy_idx); |
6dda9d55 | 781 | struct page *buddy; |
d9dddbf5 VB |
782 | unsigned int max_order; |
783 | ||
784 | max_order = min_t(unsigned int, MAX_ORDER, pageblock_order + 1); | |
1da177e4 | 785 | |
d29bb978 | 786 | VM_BUG_ON(!zone_is_initialized(zone)); |
6e9f0d58 | 787 | VM_BUG_ON_PAGE(page->flags & PAGE_FLAGS_CHECK_AT_PREP, page); |
1da177e4 | 788 | |
ed0ae21d | 789 | VM_BUG_ON(migratetype == -1); |
d9dddbf5 | 790 | if (likely(!is_migrate_isolate(migratetype))) |
8f82b55d | 791 | __mod_zone_freepage_state(zone, 1 << order, migratetype); |
ed0ae21d | 792 | |
d9dddbf5 | 793 | page_idx = pfn & ((1 << MAX_ORDER) - 1); |
1da177e4 | 794 | |
309381fe SL |
795 | VM_BUG_ON_PAGE(page_idx & ((1 << order) - 1), page); |
796 | VM_BUG_ON_PAGE(bad_range(zone, page), page); | |
1da177e4 | 797 | |
d9dddbf5 | 798 | continue_merging: |
3c605096 | 799 | while (order < max_order - 1) { |
43506fad KC |
800 | buddy_idx = __find_buddy_index(page_idx, order); |
801 | buddy = page + (buddy_idx - page_idx); | |
cb2b95e1 | 802 | if (!page_is_buddy(page, buddy, order)) |
d9dddbf5 | 803 | goto done_merging; |
c0a32fc5 SG |
804 | /* |
805 | * Our buddy is free or it is CONFIG_DEBUG_PAGEALLOC guard page, | |
806 | * merge with it and move up one order. | |
807 | */ | |
808 | if (page_is_guard(buddy)) { | |
2847cf95 | 809 | clear_page_guard(zone, buddy, order, migratetype); |
c0a32fc5 SG |
810 | } else { |
811 | list_del(&buddy->lru); | |
812 | zone->free_area[order].nr_free--; | |
813 | rmv_page_order(buddy); | |
814 | } | |
43506fad | 815 | combined_idx = buddy_idx & page_idx; |
1da177e4 LT |
816 | page = page + (combined_idx - page_idx); |
817 | page_idx = combined_idx; | |
818 | order++; | |
819 | } | |
d9dddbf5 VB |
820 | if (max_order < MAX_ORDER) { |
821 | /* If we are here, it means order is >= pageblock_order. | |
822 | * We want to prevent merge between freepages on isolate | |
823 | * pageblock and normal pageblock. Without this, pageblock | |
824 | * isolation could cause incorrect freepage or CMA accounting. | |
825 | * | |
826 | * We don't want to hit this code for the more frequent | |
827 | * low-order merging. | |
828 | */ | |
829 | if (unlikely(has_isolate_pageblock(zone))) { | |
830 | int buddy_mt; | |
831 | ||
832 | buddy_idx = __find_buddy_index(page_idx, order); | |
833 | buddy = page + (buddy_idx - page_idx); | |
834 | buddy_mt = get_pageblock_migratetype(buddy); | |
835 | ||
836 | if (migratetype != buddy_mt | |
837 | && (is_migrate_isolate(migratetype) || | |
838 | is_migrate_isolate(buddy_mt))) | |
839 | goto done_merging; | |
840 | } | |
841 | max_order++; | |
842 | goto continue_merging; | |
843 | } | |
844 | ||
845 | done_merging: | |
1da177e4 | 846 | set_page_order(page, order); |
6dda9d55 CZ |
847 | |
848 | /* | |
849 | * If this is not the largest possible page, check if the buddy | |
850 | * of the next-highest order is free. If it is, it's possible | |
851 | * that pages are being freed that will coalesce soon. In case, | |
852 | * that is happening, add the free page to the tail of the list | |
853 | * so it's less likely to be used soon and more likely to be merged | |
854 | * as a higher order page | |
855 | */ | |
b7f50cfa | 856 | if ((order < MAX_ORDER-2) && pfn_valid_within(page_to_pfn(buddy))) { |
6dda9d55 | 857 | struct page *higher_page, *higher_buddy; |
43506fad KC |
858 | combined_idx = buddy_idx & page_idx; |
859 | higher_page = page + (combined_idx - page_idx); | |
860 | buddy_idx = __find_buddy_index(combined_idx, order + 1); | |
0ba8f2d5 | 861 | higher_buddy = higher_page + (buddy_idx - combined_idx); |
6dda9d55 CZ |
862 | if (page_is_buddy(higher_page, higher_buddy, order + 1)) { |
863 | list_add_tail(&page->lru, | |
864 | &zone->free_area[order].free_list[migratetype]); | |
865 | goto out; | |
866 | } | |
867 | } | |
868 | ||
869 | list_add(&page->lru, &zone->free_area[order].free_list[migratetype]); | |
870 | out: | |
1da177e4 LT |
871 | zone->free_area[order].nr_free++; |
872 | } | |
873 | ||
7bfec6f4 MG |
874 | /* |
875 | * A bad page could be due to a number of fields. Instead of multiple branches, | |
876 | * try and check multiple fields with one check. The caller must do a detailed | |
877 | * check if necessary. | |
878 | */ | |
879 | static inline bool page_expected_state(struct page *page, | |
880 | unsigned long check_flags) | |
881 | { | |
882 | if (unlikely(atomic_read(&page->_mapcount) != -1)) | |
883 | return false; | |
884 | ||
885 | if (unlikely((unsigned long)page->mapping | | |
886 | page_ref_count(page) | | |
887 | #ifdef CONFIG_MEMCG | |
888 | (unsigned long)page->mem_cgroup | | |
889 | #endif | |
890 | (page->flags & check_flags))) | |
891 | return false; | |
892 | ||
893 | return true; | |
894 | } | |
895 | ||
bb552ac6 | 896 | static void free_pages_check_bad(struct page *page) |
1da177e4 | 897 | { |
7bfec6f4 MG |
898 | const char *bad_reason; |
899 | unsigned long bad_flags; | |
900 | ||
7bfec6f4 MG |
901 | bad_reason = NULL; |
902 | bad_flags = 0; | |
f0b791a3 | 903 | |
53f9263b | 904 | if (unlikely(atomic_read(&page->_mapcount) != -1)) |
f0b791a3 DH |
905 | bad_reason = "nonzero mapcount"; |
906 | if (unlikely(page->mapping != NULL)) | |
907 | bad_reason = "non-NULL mapping"; | |
fe896d18 | 908 | if (unlikely(page_ref_count(page) != 0)) |
0139aa7b | 909 | bad_reason = "nonzero _refcount"; |
f0b791a3 DH |
910 | if (unlikely(page->flags & PAGE_FLAGS_CHECK_AT_FREE)) { |
911 | bad_reason = "PAGE_FLAGS_CHECK_AT_FREE flag(s) set"; | |
912 | bad_flags = PAGE_FLAGS_CHECK_AT_FREE; | |
913 | } | |
9edad6ea JW |
914 | #ifdef CONFIG_MEMCG |
915 | if (unlikely(page->mem_cgroup)) | |
916 | bad_reason = "page still charged to cgroup"; | |
917 | #endif | |
7bfec6f4 | 918 | bad_page(page, bad_reason, bad_flags); |
bb552ac6 MG |
919 | } |
920 | ||
921 | static inline int free_pages_check(struct page *page) | |
922 | { | |
da838d4f | 923 | if (likely(page_expected_state(page, PAGE_FLAGS_CHECK_AT_FREE))) |
bb552ac6 | 924 | return 0; |
bb552ac6 MG |
925 | |
926 | /* Something has gone sideways, find it */ | |
927 | free_pages_check_bad(page); | |
7bfec6f4 | 928 | return 1; |
1da177e4 LT |
929 | } |
930 | ||
4db7548c MG |
931 | static int free_tail_pages_check(struct page *head_page, struct page *page) |
932 | { | |
933 | int ret = 1; | |
934 | ||
935 | /* | |
936 | * We rely page->lru.next never has bit 0 set, unless the page | |
937 | * is PageTail(). Let's make sure that's true even for poisoned ->lru. | |
938 | */ | |
939 | BUILD_BUG_ON((unsigned long)LIST_POISON1 & 1); | |
940 | ||
941 | if (!IS_ENABLED(CONFIG_DEBUG_VM)) { | |
942 | ret = 0; | |
943 | goto out; | |
944 | } | |
945 | switch (page - head_page) { | |
946 | case 1: | |
947 | /* the first tail page: ->mapping is compound_mapcount() */ | |
948 | if (unlikely(compound_mapcount(page))) { | |
949 | bad_page(page, "nonzero compound_mapcount", 0); | |
950 | goto out; | |
951 | } | |
952 | break; | |
953 | case 2: | |
954 | /* | |
955 | * the second tail page: ->mapping is | |
956 | * page_deferred_list().next -- ignore value. | |
957 | */ | |
958 | break; | |
959 | default: | |
960 | if (page->mapping != TAIL_MAPPING) { | |
961 | bad_page(page, "corrupted mapping in tail page", 0); | |
962 | goto out; | |
963 | } | |
964 | break; | |
965 | } | |
966 | if (unlikely(!PageTail(page))) { | |
967 | bad_page(page, "PageTail not set", 0); | |
968 | goto out; | |
969 | } | |
970 | if (unlikely(compound_head(page) != head_page)) { | |
971 | bad_page(page, "compound_head not consistent", 0); | |
972 | goto out; | |
973 | } | |
974 | ret = 0; | |
975 | out: | |
976 | page->mapping = NULL; | |
977 | clear_compound_head(page); | |
978 | return ret; | |
979 | } | |
980 | ||
e2769dbd MG |
981 | static __always_inline bool free_pages_prepare(struct page *page, |
982 | unsigned int order, bool check_free) | |
4db7548c | 983 | { |
e2769dbd | 984 | int bad = 0; |
4db7548c | 985 | |
4db7548c MG |
986 | VM_BUG_ON_PAGE(PageTail(page), page); |
987 | ||
e2769dbd MG |
988 | trace_mm_page_free(page, order); |
989 | kmemcheck_free_shadow(page, order); | |
e2769dbd MG |
990 | |
991 | /* | |
992 | * Check tail pages before head page information is cleared to | |
993 | * avoid checking PageCompound for order-0 pages. | |
994 | */ | |
995 | if (unlikely(order)) { | |
996 | bool compound = PageCompound(page); | |
997 | int i; | |
998 | ||
999 | VM_BUG_ON_PAGE(compound && compound_order(page) != order, page); | |
4db7548c | 1000 | |
e2769dbd MG |
1001 | for (i = 1; i < (1 << order); i++) { |
1002 | if (compound) | |
1003 | bad += free_tail_pages_check(page, page + i); | |
1004 | if (unlikely(free_pages_check(page + i))) { | |
1005 | bad++; | |
1006 | continue; | |
1007 | } | |
1008 | (page + i)->flags &= ~PAGE_FLAGS_CHECK_AT_PREP; | |
1009 | } | |
1010 | } | |
4db7548c MG |
1011 | if (PageAnonHead(page)) |
1012 | page->mapping = NULL; | |
e2769dbd MG |
1013 | if (check_free) |
1014 | bad += free_pages_check(page); | |
1015 | if (bad) | |
1016 | return false; | |
4db7548c | 1017 | |
e2769dbd MG |
1018 | page_cpupid_reset_last(page); |
1019 | page->flags &= ~PAGE_FLAGS_CHECK_AT_PREP; | |
1020 | reset_page_owner(page, order); | |
4db7548c MG |
1021 | |
1022 | if (!PageHighMem(page)) { | |
1023 | debug_check_no_locks_freed(page_address(page), | |
e2769dbd | 1024 | PAGE_SIZE << order); |
4db7548c | 1025 | debug_check_no_obj_freed(page_address(page), |
e2769dbd | 1026 | PAGE_SIZE << order); |
4db7548c | 1027 | } |
e2769dbd MG |
1028 | arch_free_page(page, order); |
1029 | kernel_poison_pages(page, 1 << order, 0); | |
1030 | kernel_map_pages(page, 1 << order, 0); | |
29b52de1 | 1031 | kasan_free_pages(page, order); |
4db7548c | 1032 | |
4db7548c MG |
1033 | return true; |
1034 | } | |
1035 | ||
e2769dbd MG |
1036 | #ifdef CONFIG_DEBUG_VM |
1037 | static inline bool free_pcp_prepare(struct page *page) | |
1038 | { | |
1039 | return free_pages_prepare(page, 0, true); | |
1040 | } | |
1041 | ||
1042 | static inline bool bulkfree_pcp_prepare(struct page *page) | |
1043 | { | |
1044 | return false; | |
1045 | } | |
1046 | #else | |
1047 | static bool free_pcp_prepare(struct page *page) | |
1048 | { | |
1049 | return free_pages_prepare(page, 0, false); | |
1050 | } | |
1051 | ||
4db7548c MG |
1052 | static bool bulkfree_pcp_prepare(struct page *page) |
1053 | { | |
1054 | return free_pages_check(page); | |
1055 | } | |
1056 | #endif /* CONFIG_DEBUG_VM */ | |
1057 | ||
1da177e4 | 1058 | /* |
5f8dcc21 | 1059 | * Frees a number of pages from the PCP lists |
1da177e4 | 1060 | * Assumes all pages on list are in same zone, and of same order. |
207f36ee | 1061 | * count is the number of pages to free. |
1da177e4 LT |
1062 | * |
1063 | * If the zone was previously in an "all pages pinned" state then look to | |
1064 | * see if this freeing clears that state. | |
1065 | * | |
1066 | * And clear the zone's pages_scanned counter, to hold off the "all pages are | |
1067 | * pinned" detection logic. | |
1068 | */ | |
5f8dcc21 MG |
1069 | static void free_pcppages_bulk(struct zone *zone, int count, |
1070 | struct per_cpu_pages *pcp) | |
1da177e4 | 1071 | { |
5f8dcc21 | 1072 | int migratetype = 0; |
a6f9edd6 | 1073 | int batch_free = 0; |
0d5d823a | 1074 | unsigned long nr_scanned; |
3777999d | 1075 | bool isolated_pageblocks; |
5f8dcc21 | 1076 | |
c54ad30c | 1077 | spin_lock(&zone->lock); |
3777999d | 1078 | isolated_pageblocks = has_isolate_pageblock(zone); |
0d5d823a MG |
1079 | nr_scanned = zone_page_state(zone, NR_PAGES_SCANNED); |
1080 | if (nr_scanned) | |
1081 | __mod_zone_page_state(zone, NR_PAGES_SCANNED, -nr_scanned); | |
f2260e6b | 1082 | |
e5b31ac2 | 1083 | while (count) { |
48db57f8 | 1084 | struct page *page; |
5f8dcc21 MG |
1085 | struct list_head *list; |
1086 | ||
1087 | /* | |
a6f9edd6 MG |
1088 | * Remove pages from lists in a round-robin fashion. A |
1089 | * batch_free count is maintained that is incremented when an | |
1090 | * empty list is encountered. This is so more pages are freed | |
1091 | * off fuller lists instead of spinning excessively around empty | |
1092 | * lists | |
5f8dcc21 MG |
1093 | */ |
1094 | do { | |
a6f9edd6 | 1095 | batch_free++; |
5f8dcc21 MG |
1096 | if (++migratetype == MIGRATE_PCPTYPES) |
1097 | migratetype = 0; | |
1098 | list = &pcp->lists[migratetype]; | |
1099 | } while (list_empty(list)); | |
48db57f8 | 1100 | |
1d16871d NK |
1101 | /* This is the only non-empty list. Free them all. */ |
1102 | if (batch_free == MIGRATE_PCPTYPES) | |
e5b31ac2 | 1103 | batch_free = count; |
1d16871d | 1104 | |
a6f9edd6 | 1105 | do { |
770c8aaa BZ |
1106 | int mt; /* migratetype of the to-be-freed page */ |
1107 | ||
a16601c5 | 1108 | page = list_last_entry(list, struct page, lru); |
a6f9edd6 MG |
1109 | /* must delete as __free_one_page list manipulates */ |
1110 | list_del(&page->lru); | |
aa016d14 | 1111 | |
bb14c2c7 | 1112 | mt = get_pcppage_migratetype(page); |
aa016d14 VB |
1113 | /* MIGRATE_ISOLATE page should not go to pcplists */ |
1114 | VM_BUG_ON_PAGE(is_migrate_isolate(mt), page); | |
1115 | /* Pageblock could have been isolated meanwhile */ | |
3777999d | 1116 | if (unlikely(isolated_pageblocks)) |
51bb1a40 | 1117 | mt = get_pageblock_migratetype(page); |
51bb1a40 | 1118 | |
4db7548c MG |
1119 | if (bulkfree_pcp_prepare(page)) |
1120 | continue; | |
1121 | ||
dc4b0caf | 1122 | __free_one_page(page, page_to_pfn(page), zone, 0, mt); |
770c8aaa | 1123 | trace_mm_page_pcpu_drain(page, 0, mt); |
e5b31ac2 | 1124 | } while (--count && --batch_free && !list_empty(list)); |
1da177e4 | 1125 | } |
c54ad30c | 1126 | spin_unlock(&zone->lock); |
1da177e4 LT |
1127 | } |
1128 | ||
dc4b0caf MG |
1129 | static void free_one_page(struct zone *zone, |
1130 | struct page *page, unsigned long pfn, | |
7aeb09f9 | 1131 | unsigned int order, |
ed0ae21d | 1132 | int migratetype) |
1da177e4 | 1133 | { |
0d5d823a | 1134 | unsigned long nr_scanned; |
006d22d9 | 1135 | spin_lock(&zone->lock); |
0d5d823a MG |
1136 | nr_scanned = zone_page_state(zone, NR_PAGES_SCANNED); |
1137 | if (nr_scanned) | |
1138 | __mod_zone_page_state(zone, NR_PAGES_SCANNED, -nr_scanned); | |
f2260e6b | 1139 | |
ad53f92e JK |
1140 | if (unlikely(has_isolate_pageblock(zone) || |
1141 | is_migrate_isolate(migratetype))) { | |
1142 | migratetype = get_pfnblock_migratetype(page, pfn); | |
ad53f92e | 1143 | } |
dc4b0caf | 1144 | __free_one_page(page, pfn, zone, order, migratetype); |
006d22d9 | 1145 | spin_unlock(&zone->lock); |
48db57f8 NP |
1146 | } |
1147 | ||
1e8ce83c RH |
1148 | static void __meminit __init_single_page(struct page *page, unsigned long pfn, |
1149 | unsigned long zone, int nid) | |
1150 | { | |
1e8ce83c | 1151 | set_page_links(page, zone, nid, pfn); |
1e8ce83c RH |
1152 | init_page_count(page); |
1153 | page_mapcount_reset(page); | |
1154 | page_cpupid_reset_last(page); | |
1e8ce83c | 1155 | |
1e8ce83c RH |
1156 | INIT_LIST_HEAD(&page->lru); |
1157 | #ifdef WANT_PAGE_VIRTUAL | |
1158 | /* The shift won't overflow because ZONE_NORMAL is below 4G. */ | |
1159 | if (!is_highmem_idx(zone)) | |
1160 | set_page_address(page, __va(pfn << PAGE_SHIFT)); | |
1161 | #endif | |
1162 | } | |
1163 | ||
1164 | static void __meminit __init_single_pfn(unsigned long pfn, unsigned long zone, | |
1165 | int nid) | |
1166 | { | |
1167 | return __init_single_page(pfn_to_page(pfn), pfn, zone, nid); | |
1168 | } | |
1169 | ||
7e18adb4 MG |
1170 | #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT |
1171 | static void init_reserved_page(unsigned long pfn) | |
1172 | { | |
1173 | pg_data_t *pgdat; | |
1174 | int nid, zid; | |
1175 | ||
1176 | if (!early_page_uninitialised(pfn)) | |
1177 | return; | |
1178 | ||
1179 | nid = early_pfn_to_nid(pfn); | |
1180 | pgdat = NODE_DATA(nid); | |
1181 | ||
1182 | for (zid = 0; zid < MAX_NR_ZONES; zid++) { | |
1183 | struct zone *zone = &pgdat->node_zones[zid]; | |
1184 | ||
1185 | if (pfn >= zone->zone_start_pfn && pfn < zone_end_pfn(zone)) | |
1186 | break; | |
1187 | } | |
1188 | __init_single_pfn(pfn, zid, nid); | |
1189 | } | |
1190 | #else | |
1191 | static inline void init_reserved_page(unsigned long pfn) | |
1192 | { | |
1193 | } | |
1194 | #endif /* CONFIG_DEFERRED_STRUCT_PAGE_INIT */ | |
1195 | ||
92923ca3 NZ |
1196 | /* |
1197 | * Initialised pages do not have PageReserved set. This function is | |
1198 | * called for each range allocated by the bootmem allocator and | |
1199 | * marks the pages PageReserved. The remaining valid pages are later | |
1200 | * sent to the buddy page allocator. | |
1201 | */ | |
4b50bcc7 | 1202 | void __meminit reserve_bootmem_region(phys_addr_t start, phys_addr_t end) |
92923ca3 NZ |
1203 | { |
1204 | unsigned long start_pfn = PFN_DOWN(start); | |
1205 | unsigned long end_pfn = PFN_UP(end); | |
1206 | ||
7e18adb4 MG |
1207 | for (; start_pfn < end_pfn; start_pfn++) { |
1208 | if (pfn_valid(start_pfn)) { | |
1209 | struct page *page = pfn_to_page(start_pfn); | |
1210 | ||
1211 | init_reserved_page(start_pfn); | |
1d798ca3 KS |
1212 | |
1213 | /* Avoid false-positive PageTail() */ | |
1214 | INIT_LIST_HEAD(&page->lru); | |
1215 | ||
7e18adb4 MG |
1216 | SetPageReserved(page); |
1217 | } | |
1218 | } | |
92923ca3 NZ |
1219 | } |
1220 | ||
ec95f53a KM |
1221 | static void __free_pages_ok(struct page *page, unsigned int order) |
1222 | { | |
1223 | unsigned long flags; | |
95e34412 | 1224 | int migratetype; |
dc4b0caf | 1225 | unsigned long pfn = page_to_pfn(page); |
ec95f53a | 1226 | |
e2769dbd | 1227 | if (!free_pages_prepare(page, order, true)) |
ec95f53a KM |
1228 | return; |
1229 | ||
cfc47a28 | 1230 | migratetype = get_pfnblock_migratetype(page, pfn); |
c54ad30c | 1231 | local_irq_save(flags); |
f8891e5e | 1232 | __count_vm_events(PGFREE, 1 << order); |
dc4b0caf | 1233 | free_one_page(page_zone(page), page, pfn, order, migratetype); |
c54ad30c | 1234 | local_irq_restore(flags); |
1da177e4 LT |
1235 | } |
1236 | ||
949698a3 | 1237 | static void __init __free_pages_boot_core(struct page *page, unsigned int order) |
a226f6c8 | 1238 | { |
c3993076 | 1239 | unsigned int nr_pages = 1 << order; |
e2d0bd2b | 1240 | struct page *p = page; |
c3993076 | 1241 | unsigned int loop; |
a226f6c8 | 1242 | |
e2d0bd2b YL |
1243 | prefetchw(p); |
1244 | for (loop = 0; loop < (nr_pages - 1); loop++, p++) { | |
1245 | prefetchw(p + 1); | |
c3993076 JW |
1246 | __ClearPageReserved(p); |
1247 | set_page_count(p, 0); | |
a226f6c8 | 1248 | } |
e2d0bd2b YL |
1249 | __ClearPageReserved(p); |
1250 | set_page_count(p, 0); | |
c3993076 | 1251 | |
e2d0bd2b | 1252 | page_zone(page)->managed_pages += nr_pages; |
c3993076 JW |
1253 | set_page_refcounted(page); |
1254 | __free_pages(page, order); | |
a226f6c8 DH |
1255 | } |
1256 | ||
75a592a4 MG |
1257 | #if defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID) || \ |
1258 | defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) | |
7ace9917 | 1259 | |
75a592a4 MG |
1260 | static struct mminit_pfnnid_cache early_pfnnid_cache __meminitdata; |
1261 | ||
1262 | int __meminit early_pfn_to_nid(unsigned long pfn) | |
1263 | { | |
7ace9917 | 1264 | static DEFINE_SPINLOCK(early_pfn_lock); |
75a592a4 MG |
1265 | int nid; |
1266 | ||
7ace9917 | 1267 | spin_lock(&early_pfn_lock); |
75a592a4 | 1268 | nid = __early_pfn_to_nid(pfn, &early_pfnnid_cache); |
7ace9917 MG |
1269 | if (nid < 0) |
1270 | nid = 0; | |
1271 | spin_unlock(&early_pfn_lock); | |
1272 | ||
1273 | return nid; | |
75a592a4 MG |
1274 | } |
1275 | #endif | |
1276 | ||
1277 | #ifdef CONFIG_NODES_SPAN_OTHER_NODES | |
1278 | static inline bool __meminit meminit_pfn_in_nid(unsigned long pfn, int node, | |
1279 | struct mminit_pfnnid_cache *state) | |
1280 | { | |
1281 | int nid; | |
1282 | ||
1283 | nid = __early_pfn_to_nid(pfn, state); | |
1284 | if (nid >= 0 && nid != node) | |
1285 | return false; | |
1286 | return true; | |
1287 | } | |
1288 | ||
1289 | /* Only safe to use early in boot when initialisation is single-threaded */ | |
1290 | static inline bool __meminit early_pfn_in_nid(unsigned long pfn, int node) | |
1291 | { | |
1292 | return meminit_pfn_in_nid(pfn, node, &early_pfnnid_cache); | |
1293 | } | |
1294 | ||
1295 | #else | |
1296 | ||
1297 | static inline bool __meminit early_pfn_in_nid(unsigned long pfn, int node) | |
1298 | { | |
1299 | return true; | |
1300 | } | |
1301 | static inline bool __meminit meminit_pfn_in_nid(unsigned long pfn, int node, | |
1302 | struct mminit_pfnnid_cache *state) | |
1303 | { | |
1304 | return true; | |
1305 | } | |
1306 | #endif | |
1307 | ||
1308 | ||
0e1cc95b | 1309 | void __init __free_pages_bootmem(struct page *page, unsigned long pfn, |
3a80a7fa MG |
1310 | unsigned int order) |
1311 | { | |
1312 | if (early_page_uninitialised(pfn)) | |
1313 | return; | |
949698a3 | 1314 | return __free_pages_boot_core(page, order); |
3a80a7fa MG |
1315 | } |
1316 | ||
7cf91a98 JK |
1317 | /* |
1318 | * Check that the whole (or subset of) a pageblock given by the interval of | |
1319 | * [start_pfn, end_pfn) is valid and within the same zone, before scanning it | |
1320 | * with the migration of free compaction scanner. The scanners then need to | |
1321 | * use only pfn_valid_within() check for arches that allow holes within | |
1322 | * pageblocks. | |
1323 | * | |
1324 | * Return struct page pointer of start_pfn, or NULL if checks were not passed. | |
1325 | * | |
1326 | * It's possible on some configurations to have a setup like node0 node1 node0 | |
1327 | * i.e. it's possible that all pages within a zones range of pages do not | |
1328 | * belong to a single zone. We assume that a border between node0 and node1 | |
1329 | * can occur within a single pageblock, but not a node0 node1 node0 | |
1330 | * interleaving within a single pageblock. It is therefore sufficient to check | |
1331 | * the first and last page of a pageblock and avoid checking each individual | |
1332 | * page in a pageblock. | |
1333 | */ | |
1334 | struct page *__pageblock_pfn_to_page(unsigned long start_pfn, | |
1335 | unsigned long end_pfn, struct zone *zone) | |
1336 | { | |
1337 | struct page *start_page; | |
1338 | struct page *end_page; | |
1339 | ||
1340 | /* end_pfn is one past the range we are checking */ | |
1341 | end_pfn--; | |
1342 | ||
1343 | if (!pfn_valid(start_pfn) || !pfn_valid(end_pfn)) | |
1344 | return NULL; | |
1345 | ||
1346 | start_page = pfn_to_page(start_pfn); | |
1347 | ||
1348 | if (page_zone(start_page) != zone) | |
1349 | return NULL; | |
1350 | ||
1351 | end_page = pfn_to_page(end_pfn); | |
1352 | ||
1353 | /* This gives a shorter code than deriving page_zone(end_page) */ | |
1354 | if (page_zone_id(start_page) != page_zone_id(end_page)) | |
1355 | return NULL; | |
1356 | ||
1357 | return start_page; | |
1358 | } | |
1359 | ||
1360 | void set_zone_contiguous(struct zone *zone) | |
1361 | { | |
1362 | unsigned long block_start_pfn = zone->zone_start_pfn; | |
1363 | unsigned long block_end_pfn; | |
1364 | ||
1365 | block_end_pfn = ALIGN(block_start_pfn + 1, pageblock_nr_pages); | |
1366 | for (; block_start_pfn < zone_end_pfn(zone); | |
1367 | block_start_pfn = block_end_pfn, | |
1368 | block_end_pfn += pageblock_nr_pages) { | |
1369 | ||
1370 | block_end_pfn = min(block_end_pfn, zone_end_pfn(zone)); | |
1371 | ||
1372 | if (!__pageblock_pfn_to_page(block_start_pfn, | |
1373 | block_end_pfn, zone)) | |
1374 | return; | |
1375 | } | |
1376 | ||
1377 | /* We confirm that there is no hole */ | |
1378 | zone->contiguous = true; | |
1379 | } | |
1380 | ||
1381 | void clear_zone_contiguous(struct zone *zone) | |
1382 | { | |
1383 | zone->contiguous = false; | |
1384 | } | |
1385 | ||
7e18adb4 | 1386 | #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT |
0e1cc95b | 1387 | static void __init deferred_free_range(struct page *page, |
a4de83dd MG |
1388 | unsigned long pfn, int nr_pages) |
1389 | { | |
1390 | int i; | |
1391 | ||
1392 | if (!page) | |
1393 | return; | |
1394 | ||
1395 | /* Free a large naturally-aligned chunk if possible */ | |
1396 | if (nr_pages == MAX_ORDER_NR_PAGES && | |
1397 | (pfn & (MAX_ORDER_NR_PAGES-1)) == 0) { | |
ac5d2539 | 1398 | set_pageblock_migratetype(page, MIGRATE_MOVABLE); |
949698a3 | 1399 | __free_pages_boot_core(page, MAX_ORDER-1); |
a4de83dd MG |
1400 | return; |
1401 | } | |
1402 | ||
949698a3 LZ |
1403 | for (i = 0; i < nr_pages; i++, page++) |
1404 | __free_pages_boot_core(page, 0); | |
a4de83dd MG |
1405 | } |
1406 | ||
d3cd131d NS |
1407 | /* Completion tracking for deferred_init_memmap() threads */ |
1408 | static atomic_t pgdat_init_n_undone __initdata; | |
1409 | static __initdata DECLARE_COMPLETION(pgdat_init_all_done_comp); | |
1410 | ||
1411 | static inline void __init pgdat_init_report_one_done(void) | |
1412 | { | |
1413 | if (atomic_dec_and_test(&pgdat_init_n_undone)) | |
1414 | complete(&pgdat_init_all_done_comp); | |
1415 | } | |
0e1cc95b | 1416 | |
7e18adb4 | 1417 | /* Initialise remaining memory on a node */ |
0e1cc95b | 1418 | static int __init deferred_init_memmap(void *data) |
7e18adb4 | 1419 | { |
0e1cc95b MG |
1420 | pg_data_t *pgdat = data; |
1421 | int nid = pgdat->node_id; | |
7e18adb4 MG |
1422 | struct mminit_pfnnid_cache nid_init_state = { }; |
1423 | unsigned long start = jiffies; | |
1424 | unsigned long nr_pages = 0; | |
1425 | unsigned long walk_start, walk_end; | |
1426 | int i, zid; | |
1427 | struct zone *zone; | |
7e18adb4 | 1428 | unsigned long first_init_pfn = pgdat->first_deferred_pfn; |
0e1cc95b | 1429 | const struct cpumask *cpumask = cpumask_of_node(pgdat->node_id); |
7e18adb4 | 1430 | |
0e1cc95b | 1431 | if (first_init_pfn == ULONG_MAX) { |
d3cd131d | 1432 | pgdat_init_report_one_done(); |
0e1cc95b MG |
1433 | return 0; |
1434 | } | |
1435 | ||
1436 | /* Bind memory initialisation thread to a local node if possible */ | |
1437 | if (!cpumask_empty(cpumask)) | |
1438 | set_cpus_allowed_ptr(current, cpumask); | |
7e18adb4 MG |
1439 | |
1440 | /* Sanity check boundaries */ | |
1441 | BUG_ON(pgdat->first_deferred_pfn < pgdat->node_start_pfn); | |
1442 | BUG_ON(pgdat->first_deferred_pfn > pgdat_end_pfn(pgdat)); | |
1443 | pgdat->first_deferred_pfn = ULONG_MAX; | |
1444 | ||
1445 | /* Only the highest zone is deferred so find it */ | |
1446 | for (zid = 0; zid < MAX_NR_ZONES; zid++) { | |
1447 | zone = pgdat->node_zones + zid; | |
1448 | if (first_init_pfn < zone_end_pfn(zone)) | |
1449 | break; | |
1450 | } | |
1451 | ||
1452 | for_each_mem_pfn_range(i, nid, &walk_start, &walk_end, NULL) { | |
1453 | unsigned long pfn, end_pfn; | |
54608c3f | 1454 | struct page *page = NULL; |
a4de83dd MG |
1455 | struct page *free_base_page = NULL; |
1456 | unsigned long free_base_pfn = 0; | |
1457 | int nr_to_free = 0; | |
7e18adb4 MG |
1458 | |
1459 | end_pfn = min(walk_end, zone_end_pfn(zone)); | |
1460 | pfn = first_init_pfn; | |
1461 | if (pfn < walk_start) | |
1462 | pfn = walk_start; | |
1463 | if (pfn < zone->zone_start_pfn) | |
1464 | pfn = zone->zone_start_pfn; | |
1465 | ||
1466 | for (; pfn < end_pfn; pfn++) { | |
54608c3f | 1467 | if (!pfn_valid_within(pfn)) |
a4de83dd | 1468 | goto free_range; |
7e18adb4 | 1469 | |
54608c3f MG |
1470 | /* |
1471 | * Ensure pfn_valid is checked every | |
1472 | * MAX_ORDER_NR_PAGES for memory holes | |
1473 | */ | |
1474 | if ((pfn & (MAX_ORDER_NR_PAGES - 1)) == 0) { | |
1475 | if (!pfn_valid(pfn)) { | |
1476 | page = NULL; | |
a4de83dd | 1477 | goto free_range; |
54608c3f MG |
1478 | } |
1479 | } | |
1480 | ||
1481 | if (!meminit_pfn_in_nid(pfn, nid, &nid_init_state)) { | |
1482 | page = NULL; | |
a4de83dd | 1483 | goto free_range; |
54608c3f MG |
1484 | } |
1485 | ||
1486 | /* Minimise pfn page lookups and scheduler checks */ | |
1487 | if (page && (pfn & (MAX_ORDER_NR_PAGES - 1)) != 0) { | |
1488 | page++; | |
1489 | } else { | |
a4de83dd MG |
1490 | nr_pages += nr_to_free; |
1491 | deferred_free_range(free_base_page, | |
1492 | free_base_pfn, nr_to_free); | |
1493 | free_base_page = NULL; | |
1494 | free_base_pfn = nr_to_free = 0; | |
1495 | ||
54608c3f MG |
1496 | page = pfn_to_page(pfn); |
1497 | cond_resched(); | |
1498 | } | |
7e18adb4 MG |
1499 | |
1500 | if (page->flags) { | |
1501 | VM_BUG_ON(page_zone(page) != zone); | |
a4de83dd | 1502 | goto free_range; |
7e18adb4 MG |
1503 | } |
1504 | ||
1505 | __init_single_page(page, pfn, zid, nid); | |
a4de83dd MG |
1506 | if (!free_base_page) { |
1507 | free_base_page = page; | |
1508 | free_base_pfn = pfn; | |
1509 | nr_to_free = 0; | |
1510 | } | |
1511 | nr_to_free++; | |
1512 | ||
1513 | /* Where possible, batch up pages for a single free */ | |
1514 | continue; | |
1515 | free_range: | |
1516 | /* Free the current block of pages to allocator */ | |
1517 | nr_pages += nr_to_free; | |
1518 | deferred_free_range(free_base_page, free_base_pfn, | |
1519 | nr_to_free); | |
1520 | free_base_page = NULL; | |
1521 | free_base_pfn = nr_to_free = 0; | |
7e18adb4 | 1522 | } |
a4de83dd | 1523 | |
7e18adb4 MG |
1524 | first_init_pfn = max(end_pfn, first_init_pfn); |
1525 | } | |
1526 | ||
1527 | /* Sanity check that the next zone really is unpopulated */ | |
1528 | WARN_ON(++zid < MAX_NR_ZONES && populated_zone(++zone)); | |
1529 | ||
0e1cc95b | 1530 | pr_info("node %d initialised, %lu pages in %ums\n", nid, nr_pages, |
7e18adb4 | 1531 | jiffies_to_msecs(jiffies - start)); |
d3cd131d NS |
1532 | |
1533 | pgdat_init_report_one_done(); | |
0e1cc95b MG |
1534 | return 0; |
1535 | } | |
7cf91a98 | 1536 | #endif /* CONFIG_DEFERRED_STRUCT_PAGE_INIT */ |
0e1cc95b MG |
1537 | |
1538 | void __init page_alloc_init_late(void) | |
1539 | { | |
7cf91a98 JK |
1540 | struct zone *zone; |
1541 | ||
1542 | #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT | |
0e1cc95b MG |
1543 | int nid; |
1544 | ||
d3cd131d NS |
1545 | /* There will be num_node_state(N_MEMORY) threads */ |
1546 | atomic_set(&pgdat_init_n_undone, num_node_state(N_MEMORY)); | |
0e1cc95b | 1547 | for_each_node_state(nid, N_MEMORY) { |
0e1cc95b MG |
1548 | kthread_run(deferred_init_memmap, NODE_DATA(nid), "pgdatinit%d", nid); |
1549 | } | |
1550 | ||
1551 | /* Block until all are initialised */ | |
d3cd131d | 1552 | wait_for_completion(&pgdat_init_all_done_comp); |
4248b0da MG |
1553 | |
1554 | /* Reinit limits that are based on free pages after the kernel is up */ | |
1555 | files_maxfiles_init(); | |
7cf91a98 JK |
1556 | #endif |
1557 | ||
1558 | for_each_populated_zone(zone) | |
1559 | set_zone_contiguous(zone); | |
7e18adb4 | 1560 | } |
7e18adb4 | 1561 | |
47118af0 | 1562 | #ifdef CONFIG_CMA |
9cf510a5 | 1563 | /* Free whole pageblock and set its migration type to MIGRATE_CMA. */ |
47118af0 MN |
1564 | void __init init_cma_reserved_pageblock(struct page *page) |
1565 | { | |
1566 | unsigned i = pageblock_nr_pages; | |
1567 | struct page *p = page; | |
1568 | ||
1569 | do { | |
1570 | __ClearPageReserved(p); | |
1571 | set_page_count(p, 0); | |
1572 | } while (++p, --i); | |
1573 | ||
47118af0 | 1574 | set_pageblock_migratetype(page, MIGRATE_CMA); |
dc78327c MN |
1575 | |
1576 | if (pageblock_order >= MAX_ORDER) { | |
1577 | i = pageblock_nr_pages; | |
1578 | p = page; | |
1579 | do { | |
1580 | set_page_refcounted(p); | |
1581 | __free_pages(p, MAX_ORDER - 1); | |
1582 | p += MAX_ORDER_NR_PAGES; | |
1583 | } while (i -= MAX_ORDER_NR_PAGES); | |
1584 | } else { | |
1585 | set_page_refcounted(page); | |
1586 | __free_pages(page, pageblock_order); | |
1587 | } | |
1588 | ||
3dcc0571 | 1589 | adjust_managed_page_count(page, pageblock_nr_pages); |
47118af0 MN |
1590 | } |
1591 | #endif | |
1da177e4 LT |
1592 | |
1593 | /* | |
1594 | * The order of subdivision here is critical for the IO subsystem. | |
1595 | * Please do not alter this order without good reasons and regression | |
1596 | * testing. Specifically, as large blocks of memory are subdivided, | |
1597 | * the order in which smaller blocks are delivered depends on the order | |
1598 | * they're subdivided in this function. This is the primary factor | |
1599 | * influencing the order in which pages are delivered to the IO | |
1600 | * subsystem according to empirical testing, and this is also justified | |
1601 | * by considering the behavior of a buddy system containing a single | |
1602 | * large block of memory acted on by a series of small allocations. | |
1603 | * This behavior is a critical factor in sglist merging's success. | |
1604 | * | |
6d49e352 | 1605 | * -- nyc |
1da177e4 | 1606 | */ |
085cc7d5 | 1607 | static inline void expand(struct zone *zone, struct page *page, |
b2a0ac88 MG |
1608 | int low, int high, struct free_area *area, |
1609 | int migratetype) | |
1da177e4 LT |
1610 | { |
1611 | unsigned long size = 1 << high; | |
1612 | ||
1613 | while (high > low) { | |
1614 | area--; | |
1615 | high--; | |
1616 | size >>= 1; | |
309381fe | 1617 | VM_BUG_ON_PAGE(bad_range(zone, &page[size]), &page[size]); |
c0a32fc5 | 1618 | |
2847cf95 | 1619 | if (IS_ENABLED(CONFIG_DEBUG_PAGEALLOC) && |
e30825f1 | 1620 | debug_guardpage_enabled() && |
2847cf95 | 1621 | high < debug_guardpage_minorder()) { |
c0a32fc5 SG |
1622 | /* |
1623 | * Mark as guard pages (or page), that will allow to | |
1624 | * merge back to allocator when buddy will be freed. | |
1625 | * Corresponding page table entries will not be touched, | |
1626 | * pages will stay not present in virtual address space | |
1627 | */ | |
2847cf95 | 1628 | set_page_guard(zone, &page[size], high, migratetype); |
c0a32fc5 SG |
1629 | continue; |
1630 | } | |
b2a0ac88 | 1631 | list_add(&page[size].lru, &area->free_list[migratetype]); |
1da177e4 LT |
1632 | area->nr_free++; |
1633 | set_page_order(&page[size], high); | |
1634 | } | |
1da177e4 LT |
1635 | } |
1636 | ||
4e611801 | 1637 | static void check_new_page_bad(struct page *page) |
1da177e4 | 1638 | { |
4e611801 VB |
1639 | const char *bad_reason = NULL; |
1640 | unsigned long bad_flags = 0; | |
7bfec6f4 | 1641 | |
53f9263b | 1642 | if (unlikely(atomic_read(&page->_mapcount) != -1)) |
f0b791a3 DH |
1643 | bad_reason = "nonzero mapcount"; |
1644 | if (unlikely(page->mapping != NULL)) | |
1645 | bad_reason = "non-NULL mapping"; | |
fe896d18 | 1646 | if (unlikely(page_ref_count(page) != 0)) |
f0b791a3 | 1647 | bad_reason = "nonzero _count"; |
f4c18e6f NH |
1648 | if (unlikely(page->flags & __PG_HWPOISON)) { |
1649 | bad_reason = "HWPoisoned (hardware-corrupted)"; | |
1650 | bad_flags = __PG_HWPOISON; | |
e570f56c NH |
1651 | /* Don't complain about hwpoisoned pages */ |
1652 | page_mapcount_reset(page); /* remove PageBuddy */ | |
1653 | return; | |
f4c18e6f | 1654 | } |
f0b791a3 DH |
1655 | if (unlikely(page->flags & PAGE_FLAGS_CHECK_AT_PREP)) { |
1656 | bad_reason = "PAGE_FLAGS_CHECK_AT_PREP flag set"; | |
1657 | bad_flags = PAGE_FLAGS_CHECK_AT_PREP; | |
1658 | } | |
9edad6ea JW |
1659 | #ifdef CONFIG_MEMCG |
1660 | if (unlikely(page->mem_cgroup)) | |
1661 | bad_reason = "page still charged to cgroup"; | |
1662 | #endif | |
4e611801 VB |
1663 | bad_page(page, bad_reason, bad_flags); |
1664 | } | |
1665 | ||
1666 | /* | |
1667 | * This page is about to be returned from the page allocator | |
1668 | */ | |
1669 | static inline int check_new_page(struct page *page) | |
1670 | { | |
1671 | if (likely(page_expected_state(page, | |
1672 | PAGE_FLAGS_CHECK_AT_PREP|__PG_HWPOISON))) | |
1673 | return 0; | |
1674 | ||
1675 | check_new_page_bad(page); | |
1676 | return 1; | |
2a7684a2 WF |
1677 | } |
1678 | ||
1414c7f4 LA |
1679 | static inline bool free_pages_prezeroed(bool poisoned) |
1680 | { | |
1681 | return IS_ENABLED(CONFIG_PAGE_POISONING_ZERO) && | |
1682 | page_poisoning_enabled() && poisoned; | |
1683 | } | |
1684 | ||
479f854a MG |
1685 | #ifdef CONFIG_DEBUG_VM |
1686 | static bool check_pcp_refill(struct page *page) | |
1687 | { | |
1688 | return false; | |
1689 | } | |
1690 | ||
1691 | static bool check_new_pcp(struct page *page) | |
1692 | { | |
1693 | return check_new_page(page); | |
1694 | } | |
1695 | #else | |
1696 | static bool check_pcp_refill(struct page *page) | |
1697 | { | |
1698 | return check_new_page(page); | |
1699 | } | |
1700 | static bool check_new_pcp(struct page *page) | |
1701 | { | |
1702 | return false; | |
1703 | } | |
1704 | #endif /* CONFIG_DEBUG_VM */ | |
1705 | ||
1706 | static bool check_new_pages(struct page *page, unsigned int order) | |
1707 | { | |
1708 | int i; | |
1709 | for (i = 0; i < (1 << order); i++) { | |
1710 | struct page *p = page + i; | |
1711 | ||
1712 | if (unlikely(check_new_page(p))) | |
1713 | return true; | |
1714 | } | |
1715 | ||
1716 | return false; | |
1717 | } | |
1718 | ||
1719 | static void prep_new_page(struct page *page, unsigned int order, gfp_t gfp_flags, | |
c603844b | 1720 | unsigned int alloc_flags) |
2a7684a2 WF |
1721 | { |
1722 | int i; | |
1414c7f4 | 1723 | bool poisoned = true; |
2a7684a2 WF |
1724 | |
1725 | for (i = 0; i < (1 << order); i++) { | |
1726 | struct page *p = page + i; | |
1414c7f4 LA |
1727 | if (poisoned) |
1728 | poisoned &= page_is_poisoned(p); | |
2a7684a2 | 1729 | } |
689bcebf | 1730 | |
4c21e2f2 | 1731 | set_page_private(page, 0); |
7835e98b | 1732 | set_page_refcounted(page); |
cc102509 NP |
1733 | |
1734 | arch_alloc_page(page, order); | |
1da177e4 | 1735 | kernel_map_pages(page, 1 << order, 1); |
8823b1db | 1736 | kernel_poison_pages(page, 1 << order, 1); |
b8c73fc2 | 1737 | kasan_alloc_pages(page, order); |
17cf4406 | 1738 | |
1414c7f4 | 1739 | if (!free_pages_prezeroed(poisoned) && (gfp_flags & __GFP_ZERO)) |
f4d2897b AA |
1740 | for (i = 0; i < (1 << order); i++) |
1741 | clear_highpage(page + i); | |
17cf4406 NP |
1742 | |
1743 | if (order && (gfp_flags & __GFP_COMP)) | |
1744 | prep_compound_page(page, order); | |
1745 | ||
48c96a36 JK |
1746 | set_page_owner(page, order, gfp_flags); |
1747 | ||
75379191 | 1748 | /* |
2f064f34 | 1749 | * page is set pfmemalloc when ALLOC_NO_WATERMARKS was necessary to |
75379191 VB |
1750 | * allocate the page. The expectation is that the caller is taking |
1751 | * steps that will free more memory. The caller should avoid the page | |
1752 | * being used for !PFMEMALLOC purposes. | |
1753 | */ | |
2f064f34 MH |
1754 | if (alloc_flags & ALLOC_NO_WATERMARKS) |
1755 | set_page_pfmemalloc(page); | |
1756 | else | |
1757 | clear_page_pfmemalloc(page); | |
1da177e4 LT |
1758 | } |
1759 | ||
56fd56b8 MG |
1760 | /* |
1761 | * Go through the free lists for the given migratetype and remove | |
1762 | * the smallest available page from the freelists | |
1763 | */ | |
728ec980 MG |
1764 | static inline |
1765 | struct page *__rmqueue_smallest(struct zone *zone, unsigned int order, | |
56fd56b8 MG |
1766 | int migratetype) |
1767 | { | |
1768 | unsigned int current_order; | |
b8af2941 | 1769 | struct free_area *area; |
56fd56b8 MG |
1770 | struct page *page; |
1771 | ||
1772 | /* Find a page of the appropriate size in the preferred list */ | |
1773 | for (current_order = order; current_order < MAX_ORDER; ++current_order) { | |
1774 | area = &(zone->free_area[current_order]); | |
a16601c5 | 1775 | page = list_first_entry_or_null(&area->free_list[migratetype], |
56fd56b8 | 1776 | struct page, lru); |
a16601c5 GT |
1777 | if (!page) |
1778 | continue; | |
56fd56b8 MG |
1779 | list_del(&page->lru); |
1780 | rmv_page_order(page); | |
1781 | area->nr_free--; | |
56fd56b8 | 1782 | expand(zone, page, order, current_order, area, migratetype); |
bb14c2c7 | 1783 | set_pcppage_migratetype(page, migratetype); |
56fd56b8 MG |
1784 | return page; |
1785 | } | |
1786 | ||
1787 | return NULL; | |
1788 | } | |
1789 | ||
1790 | ||
b2a0ac88 MG |
1791 | /* |
1792 | * This array describes the order lists are fallen back to when | |
1793 | * the free lists for the desirable migrate type are depleted | |
1794 | */ | |
47118af0 | 1795 | static int fallbacks[MIGRATE_TYPES][4] = { |
974a786e MG |
1796 | [MIGRATE_UNMOVABLE] = { MIGRATE_RECLAIMABLE, MIGRATE_MOVABLE, MIGRATE_TYPES }, |
1797 | [MIGRATE_RECLAIMABLE] = { MIGRATE_UNMOVABLE, MIGRATE_MOVABLE, MIGRATE_TYPES }, | |
1798 | [MIGRATE_MOVABLE] = { MIGRATE_RECLAIMABLE, MIGRATE_UNMOVABLE, MIGRATE_TYPES }, | |
47118af0 | 1799 | #ifdef CONFIG_CMA |
974a786e | 1800 | [MIGRATE_CMA] = { MIGRATE_TYPES }, /* Never used */ |
47118af0 | 1801 | #endif |
194159fb | 1802 | #ifdef CONFIG_MEMORY_ISOLATION |
974a786e | 1803 | [MIGRATE_ISOLATE] = { MIGRATE_TYPES }, /* Never used */ |
194159fb | 1804 | #endif |
b2a0ac88 MG |
1805 | }; |
1806 | ||
dc67647b JK |
1807 | #ifdef CONFIG_CMA |
1808 | static struct page *__rmqueue_cma_fallback(struct zone *zone, | |
1809 | unsigned int order) | |
1810 | { | |
1811 | return __rmqueue_smallest(zone, order, MIGRATE_CMA); | |
1812 | } | |
1813 | #else | |
1814 | static inline struct page *__rmqueue_cma_fallback(struct zone *zone, | |
1815 | unsigned int order) { return NULL; } | |
1816 | #endif | |
1817 | ||
c361be55 MG |
1818 | /* |
1819 | * Move the free pages in a range to the free lists of the requested type. | |
d9c23400 | 1820 | * Note that start_page and end_pages are not aligned on a pageblock |
c361be55 MG |
1821 | * boundary. If alignment is required, use move_freepages_block() |
1822 | */ | |
435b405c | 1823 | int move_freepages(struct zone *zone, |
b69a7288 AB |
1824 | struct page *start_page, struct page *end_page, |
1825 | int migratetype) | |
c361be55 MG |
1826 | { |
1827 | struct page *page; | |
d00181b9 | 1828 | unsigned int order; |
d100313f | 1829 | int pages_moved = 0; |
c361be55 MG |
1830 | |
1831 | #ifndef CONFIG_HOLES_IN_ZONE | |
1832 | /* | |
1833 | * page_zone is not safe to call in this context when | |
1834 | * CONFIG_HOLES_IN_ZONE is set. This bug check is probably redundant | |
1835 | * anyway as we check zone boundaries in move_freepages_block(). | |
1836 | * Remove at a later date when no bug reports exist related to | |
ac0e5b7a | 1837 | * grouping pages by mobility |
c361be55 | 1838 | */ |
97ee4ba7 | 1839 | VM_BUG_ON(page_zone(start_page) != page_zone(end_page)); |
c361be55 MG |
1840 | #endif |
1841 | ||
1842 | for (page = start_page; page <= end_page;) { | |
344c790e | 1843 | /* Make sure we are not inadvertently changing nodes */ |
309381fe | 1844 | VM_BUG_ON_PAGE(page_to_nid(page) != zone_to_nid(zone), page); |
344c790e | 1845 | |
c361be55 MG |
1846 | if (!pfn_valid_within(page_to_pfn(page))) { |
1847 | page++; | |
1848 | continue; | |
1849 | } | |
1850 | ||
1851 | if (!PageBuddy(page)) { | |
1852 | page++; | |
1853 | continue; | |
1854 | } | |
1855 | ||
1856 | order = page_order(page); | |
84be48d8 KS |
1857 | list_move(&page->lru, |
1858 | &zone->free_area[order].free_list[migratetype]); | |
c361be55 | 1859 | page += 1 << order; |
d100313f | 1860 | pages_moved += 1 << order; |
c361be55 MG |
1861 | } |
1862 | ||
d100313f | 1863 | return pages_moved; |
c361be55 MG |
1864 | } |
1865 | ||
ee6f509c | 1866 | int move_freepages_block(struct zone *zone, struct page *page, |
68e3e926 | 1867 | int migratetype) |
c361be55 MG |
1868 | { |
1869 | unsigned long start_pfn, end_pfn; | |
1870 | struct page *start_page, *end_page; | |
1871 | ||
1872 | start_pfn = page_to_pfn(page); | |
d9c23400 | 1873 | start_pfn = start_pfn & ~(pageblock_nr_pages-1); |
c361be55 | 1874 | start_page = pfn_to_page(start_pfn); |
d9c23400 MG |
1875 | end_page = start_page + pageblock_nr_pages - 1; |
1876 | end_pfn = start_pfn + pageblock_nr_pages - 1; | |
c361be55 MG |
1877 | |
1878 | /* Do not cross zone boundaries */ | |
108bcc96 | 1879 | if (!zone_spans_pfn(zone, start_pfn)) |
c361be55 | 1880 | start_page = page; |
108bcc96 | 1881 | if (!zone_spans_pfn(zone, end_pfn)) |
c361be55 MG |
1882 | return 0; |
1883 | ||
1884 | return move_freepages(zone, start_page, end_page, migratetype); | |
1885 | } | |
1886 | ||
2f66a68f MG |
1887 | static void change_pageblock_range(struct page *pageblock_page, |
1888 | int start_order, int migratetype) | |
1889 | { | |
1890 | int nr_pageblocks = 1 << (start_order - pageblock_order); | |
1891 | ||
1892 | while (nr_pageblocks--) { | |
1893 | set_pageblock_migratetype(pageblock_page, migratetype); | |
1894 | pageblock_page += pageblock_nr_pages; | |
1895 | } | |
1896 | } | |
1897 | ||
fef903ef | 1898 | /* |
9c0415eb VB |
1899 | * When we are falling back to another migratetype during allocation, try to |
1900 | * steal extra free pages from the same pageblocks to satisfy further | |
1901 | * allocations, instead of polluting multiple pageblocks. | |
1902 | * | |
1903 | * If we are stealing a relatively large buddy page, it is likely there will | |
1904 | * be more free pages in the pageblock, so try to steal them all. For | |
1905 | * reclaimable and unmovable allocations, we steal regardless of page size, | |
1906 | * as fragmentation caused by those allocations polluting movable pageblocks | |
1907 | * is worse than movable allocations stealing from unmovable and reclaimable | |
1908 | * pageblocks. | |
fef903ef | 1909 | */ |
4eb7dce6 JK |
1910 | static bool can_steal_fallback(unsigned int order, int start_mt) |
1911 | { | |
1912 | /* | |
1913 | * Leaving this order check is intended, although there is | |
1914 | * relaxed order check in next check. The reason is that | |
1915 | * we can actually steal whole pageblock if this condition met, | |
1916 | * but, below check doesn't guarantee it and that is just heuristic | |
1917 | * so could be changed anytime. | |
1918 | */ | |
1919 | if (order >= pageblock_order) | |
1920 | return true; | |
1921 | ||
1922 | if (order >= pageblock_order / 2 || | |
1923 | start_mt == MIGRATE_RECLAIMABLE || | |
1924 | start_mt == MIGRATE_UNMOVABLE || | |
1925 | page_group_by_mobility_disabled) | |
1926 | return true; | |
1927 | ||
1928 | return false; | |
1929 | } | |
1930 | ||
1931 | /* | |
1932 | * This function implements actual steal behaviour. If order is large enough, | |
1933 | * we can steal whole pageblock. If not, we first move freepages in this | |
1934 | * pageblock and check whether half of pages are moved or not. If half of | |
1935 | * pages are moved, we can change migratetype of pageblock and permanently | |
1936 | * use it's pages as requested migratetype in the future. | |
1937 | */ | |
1938 | static void steal_suitable_fallback(struct zone *zone, struct page *page, | |
1939 | int start_type) | |
fef903ef | 1940 | { |
d00181b9 | 1941 | unsigned int current_order = page_order(page); |
4eb7dce6 | 1942 | int pages; |
fef903ef | 1943 | |
fef903ef SB |
1944 | /* Take ownership for orders >= pageblock_order */ |
1945 | if (current_order >= pageblock_order) { | |
1946 | change_pageblock_range(page, current_order, start_type); | |
3a1086fb | 1947 | return; |
fef903ef SB |
1948 | } |
1949 | ||
4eb7dce6 | 1950 | pages = move_freepages_block(zone, page, start_type); |
fef903ef | 1951 | |
4eb7dce6 JK |
1952 | /* Claim the whole block if over half of it is free */ |
1953 | if (pages >= (1 << (pageblock_order-1)) || | |
1954 | page_group_by_mobility_disabled) | |
1955 | set_pageblock_migratetype(page, start_type); | |
1956 | } | |
1957 | ||
2149cdae JK |
1958 | /* |
1959 | * Check whether there is a suitable fallback freepage with requested order. | |
1960 | * If only_stealable is true, this function returns fallback_mt only if | |
1961 | * we can steal other freepages all together. This would help to reduce | |
1962 | * fragmentation due to mixed migratetype pages in one pageblock. | |
1963 | */ | |
1964 | int find_suitable_fallback(struct free_area *area, unsigned int order, | |
1965 | int migratetype, bool only_stealable, bool *can_steal) | |
4eb7dce6 JK |
1966 | { |
1967 | int i; | |
1968 | int fallback_mt; | |
1969 | ||
1970 | if (area->nr_free == 0) | |
1971 | return -1; | |
1972 | ||
1973 | *can_steal = false; | |
1974 | for (i = 0;; i++) { | |
1975 | fallback_mt = fallbacks[migratetype][i]; | |
974a786e | 1976 | if (fallback_mt == MIGRATE_TYPES) |
4eb7dce6 JK |
1977 | break; |
1978 | ||
1979 | if (list_empty(&area->free_list[fallback_mt])) | |
1980 | continue; | |
fef903ef | 1981 | |
4eb7dce6 JK |
1982 | if (can_steal_fallback(order, migratetype)) |
1983 | *can_steal = true; | |
1984 | ||
2149cdae JK |
1985 | if (!only_stealable) |
1986 | return fallback_mt; | |
1987 | ||
1988 | if (*can_steal) | |
1989 | return fallback_mt; | |
fef903ef | 1990 | } |
4eb7dce6 JK |
1991 | |
1992 | return -1; | |
fef903ef SB |
1993 | } |
1994 | ||
0aaa29a5 MG |
1995 | /* |
1996 | * Reserve a pageblock for exclusive use of high-order atomic allocations if | |
1997 | * there are no empty page blocks that contain a page with a suitable order | |
1998 | */ | |
1999 | static void reserve_highatomic_pageblock(struct page *page, struct zone *zone, | |
2000 | unsigned int alloc_order) | |
2001 | { | |
2002 | int mt; | |
2003 | unsigned long max_managed, flags; | |
2004 | ||
2005 | /* | |
2006 | * Limit the number reserved to 1 pageblock or roughly 1% of a zone. | |
2007 | * Check is race-prone but harmless. | |
2008 | */ | |
2009 | max_managed = (zone->managed_pages / 100) + pageblock_nr_pages; | |
2010 | if (zone->nr_reserved_highatomic >= max_managed) | |
2011 | return; | |
2012 | ||
2013 | spin_lock_irqsave(&zone->lock, flags); | |
2014 | ||
2015 | /* Recheck the nr_reserved_highatomic limit under the lock */ | |
2016 | if (zone->nr_reserved_highatomic >= max_managed) | |
2017 | goto out_unlock; | |
2018 | ||
2019 | /* Yoink! */ | |
2020 | mt = get_pageblock_migratetype(page); | |
2021 | if (mt != MIGRATE_HIGHATOMIC && | |
2022 | !is_migrate_isolate(mt) && !is_migrate_cma(mt)) { | |
2023 | zone->nr_reserved_highatomic += pageblock_nr_pages; | |
2024 | set_pageblock_migratetype(page, MIGRATE_HIGHATOMIC); | |
2025 | move_freepages_block(zone, page, MIGRATE_HIGHATOMIC); | |
2026 | } | |
2027 | ||
2028 | out_unlock: | |
2029 | spin_unlock_irqrestore(&zone->lock, flags); | |
2030 | } | |
2031 | ||
2032 | /* | |
2033 | * Used when an allocation is about to fail under memory pressure. This | |
2034 | * potentially hurts the reliability of high-order allocations when under | |
2035 | * intense memory pressure but failed atomic allocations should be easier | |
2036 | * to recover from than an OOM. | |
2037 | */ | |
2038 | static void unreserve_highatomic_pageblock(const struct alloc_context *ac) | |
2039 | { | |
2040 | struct zonelist *zonelist = ac->zonelist; | |
2041 | unsigned long flags; | |
2042 | struct zoneref *z; | |
2043 | struct zone *zone; | |
2044 | struct page *page; | |
2045 | int order; | |
2046 | ||
2047 | for_each_zone_zonelist_nodemask(zone, z, zonelist, ac->high_zoneidx, | |
2048 | ac->nodemask) { | |
2049 | /* Preserve at least one pageblock */ | |
2050 | if (zone->nr_reserved_highatomic <= pageblock_nr_pages) | |
2051 | continue; | |
2052 | ||
2053 | spin_lock_irqsave(&zone->lock, flags); | |
2054 | for (order = 0; order < MAX_ORDER; order++) { | |
2055 | struct free_area *area = &(zone->free_area[order]); | |
2056 | ||
a16601c5 GT |
2057 | page = list_first_entry_or_null( |
2058 | &area->free_list[MIGRATE_HIGHATOMIC], | |
2059 | struct page, lru); | |
2060 | if (!page) | |
0aaa29a5 MG |
2061 | continue; |
2062 | ||
0aaa29a5 MG |
2063 | /* |
2064 | * It should never happen but changes to locking could | |
2065 | * inadvertently allow a per-cpu drain to add pages | |
2066 | * to MIGRATE_HIGHATOMIC while unreserving so be safe | |
2067 | * and watch for underflows. | |
2068 | */ | |
2069 | zone->nr_reserved_highatomic -= min(pageblock_nr_pages, | |
2070 | zone->nr_reserved_highatomic); | |
2071 | ||
2072 | /* | |
2073 | * Convert to ac->migratetype and avoid the normal | |
2074 | * pageblock stealing heuristics. Minimally, the caller | |
2075 | * is doing the work and needs the pages. More | |
2076 | * importantly, if the block was always converted to | |
2077 | * MIGRATE_UNMOVABLE or another type then the number | |
2078 | * of pageblocks that cannot be completely freed | |
2079 | * may increase. | |
2080 | */ | |
2081 | set_pageblock_migratetype(page, ac->migratetype); | |
2082 | move_freepages_block(zone, page, ac->migratetype); | |
2083 | spin_unlock_irqrestore(&zone->lock, flags); | |
2084 | return; | |
2085 | } | |
2086 | spin_unlock_irqrestore(&zone->lock, flags); | |
2087 | } | |
2088 | } | |
2089 | ||
b2a0ac88 | 2090 | /* Remove an element from the buddy allocator from the fallback list */ |
0ac3a409 | 2091 | static inline struct page * |
7aeb09f9 | 2092 | __rmqueue_fallback(struct zone *zone, unsigned int order, int start_migratetype) |
b2a0ac88 | 2093 | { |
b8af2941 | 2094 | struct free_area *area; |
7aeb09f9 | 2095 | unsigned int current_order; |
b2a0ac88 | 2096 | struct page *page; |
4eb7dce6 JK |
2097 | int fallback_mt; |
2098 | bool can_steal; | |
b2a0ac88 MG |
2099 | |
2100 | /* Find the largest possible block of pages in the other list */ | |
7aeb09f9 MG |
2101 | for (current_order = MAX_ORDER-1; |
2102 | current_order >= order && current_order <= MAX_ORDER-1; | |
2103 | --current_order) { | |
4eb7dce6 JK |
2104 | area = &(zone->free_area[current_order]); |
2105 | fallback_mt = find_suitable_fallback(area, current_order, | |
2149cdae | 2106 | start_migratetype, false, &can_steal); |
4eb7dce6 JK |
2107 | if (fallback_mt == -1) |
2108 | continue; | |
b2a0ac88 | 2109 | |
a16601c5 | 2110 | page = list_first_entry(&area->free_list[fallback_mt], |
4eb7dce6 JK |
2111 | struct page, lru); |
2112 | if (can_steal) | |
2113 | steal_suitable_fallback(zone, page, start_migratetype); | |
b2a0ac88 | 2114 | |
4eb7dce6 JK |
2115 | /* Remove the page from the freelists */ |
2116 | area->nr_free--; | |
2117 | list_del(&page->lru); | |
2118 | rmv_page_order(page); | |
3a1086fb | 2119 | |
4eb7dce6 JK |
2120 | expand(zone, page, order, current_order, area, |
2121 | start_migratetype); | |
2122 | /* | |
bb14c2c7 | 2123 | * The pcppage_migratetype may differ from pageblock's |
4eb7dce6 | 2124 | * migratetype depending on the decisions in |
bb14c2c7 VB |
2125 | * find_suitable_fallback(). This is OK as long as it does not |
2126 | * differ for MIGRATE_CMA pageblocks. Those can be used as | |
2127 | * fallback only via special __rmqueue_cma_fallback() function | |
4eb7dce6 | 2128 | */ |
bb14c2c7 | 2129 | set_pcppage_migratetype(page, start_migratetype); |
e0fff1bd | 2130 | |
4eb7dce6 JK |
2131 | trace_mm_page_alloc_extfrag(page, order, current_order, |
2132 | start_migratetype, fallback_mt); | |
e0fff1bd | 2133 | |
4eb7dce6 | 2134 | return page; |
b2a0ac88 MG |
2135 | } |
2136 | ||
728ec980 | 2137 | return NULL; |
b2a0ac88 MG |
2138 | } |
2139 | ||
56fd56b8 | 2140 | /* |
1da177e4 LT |
2141 | * Do the hard work of removing an element from the buddy allocator. |
2142 | * Call me with the zone->lock already held. | |
2143 | */ | |
b2a0ac88 | 2144 | static struct page *__rmqueue(struct zone *zone, unsigned int order, |
6ac0206b | 2145 | int migratetype) |
1da177e4 | 2146 | { |
1da177e4 LT |
2147 | struct page *page; |
2148 | ||
56fd56b8 | 2149 | page = __rmqueue_smallest(zone, order, migratetype); |
974a786e | 2150 | if (unlikely(!page)) { |
dc67647b JK |
2151 | if (migratetype == MIGRATE_MOVABLE) |
2152 | page = __rmqueue_cma_fallback(zone, order); | |
2153 | ||
2154 | if (!page) | |
2155 | page = __rmqueue_fallback(zone, order, migratetype); | |
728ec980 MG |
2156 | } |
2157 | ||
0d3d062a | 2158 | trace_mm_page_alloc_zone_locked(page, order, migratetype); |
b2a0ac88 | 2159 | return page; |
1da177e4 LT |
2160 | } |
2161 | ||
5f63b720 | 2162 | /* |
1da177e4 LT |
2163 | * Obtain a specified number of elements from the buddy allocator, all under |
2164 | * a single hold of the lock, for efficiency. Add them to the supplied list. | |
2165 | * Returns the number of new pages which were placed at *list. | |
2166 | */ | |
5f63b720 | 2167 | static int rmqueue_bulk(struct zone *zone, unsigned int order, |
b2a0ac88 | 2168 | unsigned long count, struct list_head *list, |
b745bc85 | 2169 | int migratetype, bool cold) |
1da177e4 | 2170 | { |
5bcc9f86 | 2171 | int i; |
5f63b720 | 2172 | |
c54ad30c | 2173 | spin_lock(&zone->lock); |
1da177e4 | 2174 | for (i = 0; i < count; ++i) { |
6ac0206b | 2175 | struct page *page = __rmqueue(zone, order, migratetype); |
085cc7d5 | 2176 | if (unlikely(page == NULL)) |
1da177e4 | 2177 | break; |
81eabcbe | 2178 | |
479f854a MG |
2179 | if (unlikely(check_pcp_refill(page))) |
2180 | continue; | |
2181 | ||
81eabcbe MG |
2182 | /* |
2183 | * Split buddy pages returned by expand() are received here | |
2184 | * in physical page order. The page is added to the callers and | |
2185 | * list and the list head then moves forward. From the callers | |
2186 | * perspective, the linked list is ordered by page number in | |
2187 | * some conditions. This is useful for IO devices that can | |
2188 | * merge IO requests if the physical pages are ordered | |
2189 | * properly. | |
2190 | */ | |
b745bc85 | 2191 | if (likely(!cold)) |
e084b2d9 MG |
2192 | list_add(&page->lru, list); |
2193 | else | |
2194 | list_add_tail(&page->lru, list); | |
81eabcbe | 2195 | list = &page->lru; |
bb14c2c7 | 2196 | if (is_migrate_cma(get_pcppage_migratetype(page))) |
d1ce749a BZ |
2197 | __mod_zone_page_state(zone, NR_FREE_CMA_PAGES, |
2198 | -(1 << order)); | |
1da177e4 | 2199 | } |
f2260e6b | 2200 | __mod_zone_page_state(zone, NR_FREE_PAGES, -(i << order)); |
c54ad30c | 2201 | spin_unlock(&zone->lock); |
085cc7d5 | 2202 | return i; |
1da177e4 LT |
2203 | } |
2204 | ||
4ae7c039 | 2205 | #ifdef CONFIG_NUMA |
8fce4d8e | 2206 | /* |
4037d452 CL |
2207 | * Called from the vmstat counter updater to drain pagesets of this |
2208 | * currently executing processor on remote nodes after they have | |
2209 | * expired. | |
2210 | * | |
879336c3 CL |
2211 | * Note that this function must be called with the thread pinned to |
2212 | * a single processor. | |
8fce4d8e | 2213 | */ |
4037d452 | 2214 | void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp) |
4ae7c039 | 2215 | { |
4ae7c039 | 2216 | unsigned long flags; |
7be12fc9 | 2217 | int to_drain, batch; |
4ae7c039 | 2218 | |
4037d452 | 2219 | local_irq_save(flags); |
4db0c3c2 | 2220 | batch = READ_ONCE(pcp->batch); |
7be12fc9 | 2221 | to_drain = min(pcp->count, batch); |
2a13515c KM |
2222 | if (to_drain > 0) { |
2223 | free_pcppages_bulk(zone, to_drain, pcp); | |
2224 | pcp->count -= to_drain; | |
2225 | } | |
4037d452 | 2226 | local_irq_restore(flags); |
4ae7c039 CL |
2227 | } |
2228 | #endif | |
2229 | ||
9f8f2172 | 2230 | /* |
93481ff0 | 2231 | * Drain pcplists of the indicated processor and zone. |
9f8f2172 CL |
2232 | * |
2233 | * The processor must either be the current processor and the | |
2234 | * thread pinned to the current processor or a processor that | |
2235 | * is not online. | |
2236 | */ | |
93481ff0 | 2237 | static void drain_pages_zone(unsigned int cpu, struct zone *zone) |
1da177e4 | 2238 | { |
c54ad30c | 2239 | unsigned long flags; |
93481ff0 VB |
2240 | struct per_cpu_pageset *pset; |
2241 | struct per_cpu_pages *pcp; | |
1da177e4 | 2242 | |
93481ff0 VB |
2243 | local_irq_save(flags); |
2244 | pset = per_cpu_ptr(zone->pageset, cpu); | |
1da177e4 | 2245 | |
93481ff0 VB |
2246 | pcp = &pset->pcp; |
2247 | if (pcp->count) { | |
2248 | free_pcppages_bulk(zone, pcp->count, pcp); | |
2249 | pcp->count = 0; | |
2250 | } | |
2251 | local_irq_restore(flags); | |
2252 | } | |
3dfa5721 | 2253 | |
93481ff0 VB |
2254 | /* |
2255 | * Drain pcplists of all zones on the indicated processor. | |
2256 | * | |
2257 | * The processor must either be the current processor and the | |
2258 | * thread pinned to the current processor or a processor that | |
2259 | * is not online. | |
2260 | */ | |
2261 | static void drain_pages(unsigned int cpu) | |
2262 | { | |
2263 | struct zone *zone; | |
2264 | ||
2265 | for_each_populated_zone(zone) { | |
2266 | drain_pages_zone(cpu, zone); | |
1da177e4 LT |
2267 | } |
2268 | } | |
1da177e4 | 2269 | |
9f8f2172 CL |
2270 | /* |
2271 | * Spill all of this CPU's per-cpu pages back into the buddy allocator. | |
93481ff0 VB |
2272 | * |
2273 | * The CPU has to be pinned. When zone parameter is non-NULL, spill just | |
2274 | * the single zone's pages. | |
9f8f2172 | 2275 | */ |
93481ff0 | 2276 | void drain_local_pages(struct zone *zone) |
9f8f2172 | 2277 | { |
93481ff0 VB |
2278 | int cpu = smp_processor_id(); |
2279 | ||
2280 | if (zone) | |
2281 | drain_pages_zone(cpu, zone); | |
2282 | else | |
2283 | drain_pages(cpu); | |
9f8f2172 CL |
2284 | } |
2285 | ||
2286 | /* | |
74046494 GBY |
2287 | * Spill all the per-cpu pages from all CPUs back into the buddy allocator. |
2288 | * | |
93481ff0 VB |
2289 | * When zone parameter is non-NULL, spill just the single zone's pages. |
2290 | * | |
74046494 GBY |
2291 | * Note that this code is protected against sending an IPI to an offline |
2292 | * CPU but does not guarantee sending an IPI to newly hotplugged CPUs: | |
2293 | * on_each_cpu_mask() blocks hotplug and won't talk to offlined CPUs but | |
2294 | * nothing keeps CPUs from showing up after we populated the cpumask and | |
2295 | * before the call to on_each_cpu_mask(). | |
9f8f2172 | 2296 | */ |
93481ff0 | 2297 | void drain_all_pages(struct zone *zone) |
9f8f2172 | 2298 | { |
74046494 | 2299 | int cpu; |
74046494 GBY |
2300 | |
2301 | /* | |
2302 | * Allocate in the BSS so we wont require allocation in | |
2303 | * direct reclaim path for CONFIG_CPUMASK_OFFSTACK=y | |
2304 | */ | |
2305 | static cpumask_t cpus_with_pcps; | |
2306 | ||
2307 | /* | |
2308 | * We don't care about racing with CPU hotplug event | |
2309 | * as offline notification will cause the notified | |
2310 | * cpu to drain that CPU pcps and on_each_cpu_mask | |
2311 | * disables preemption as part of its processing | |
2312 | */ | |
2313 | for_each_online_cpu(cpu) { | |
93481ff0 VB |
2314 | struct per_cpu_pageset *pcp; |
2315 | struct zone *z; | |
74046494 | 2316 | bool has_pcps = false; |
93481ff0 VB |
2317 | |
2318 | if (zone) { | |
74046494 | 2319 | pcp = per_cpu_ptr(zone->pageset, cpu); |
93481ff0 | 2320 | if (pcp->pcp.count) |
74046494 | 2321 | has_pcps = true; |
93481ff0 VB |
2322 | } else { |
2323 | for_each_populated_zone(z) { | |
2324 | pcp = per_cpu_ptr(z->pageset, cpu); | |
2325 | if (pcp->pcp.count) { | |
2326 | has_pcps = true; | |
2327 | break; | |
2328 | } | |
74046494 GBY |
2329 | } |
2330 | } | |
93481ff0 | 2331 | |
74046494 GBY |
2332 | if (has_pcps) |
2333 | cpumask_set_cpu(cpu, &cpus_with_pcps); | |
2334 | else | |
2335 | cpumask_clear_cpu(cpu, &cpus_with_pcps); | |
2336 | } | |
93481ff0 VB |
2337 | on_each_cpu_mask(&cpus_with_pcps, (smp_call_func_t) drain_local_pages, |
2338 | zone, 1); | |
9f8f2172 CL |
2339 | } |
2340 | ||
296699de | 2341 | #ifdef CONFIG_HIBERNATION |
1da177e4 LT |
2342 | |
2343 | void mark_free_pages(struct zone *zone) | |
2344 | { | |
f623f0db RW |
2345 | unsigned long pfn, max_zone_pfn; |
2346 | unsigned long flags; | |
7aeb09f9 | 2347 | unsigned int order, t; |
86760a2c | 2348 | struct page *page; |
1da177e4 | 2349 | |
8080fc03 | 2350 | if (zone_is_empty(zone)) |
1da177e4 LT |
2351 | return; |
2352 | ||
2353 | spin_lock_irqsave(&zone->lock, flags); | |
f623f0db | 2354 | |
108bcc96 | 2355 | max_zone_pfn = zone_end_pfn(zone); |
f623f0db RW |
2356 | for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++) |
2357 | if (pfn_valid(pfn)) { | |
86760a2c | 2358 | page = pfn_to_page(pfn); |
ba6b0979 JK |
2359 | |
2360 | if (page_zone(page) != zone) | |
2361 | continue; | |
2362 | ||
7be98234 RW |
2363 | if (!swsusp_page_is_forbidden(page)) |
2364 | swsusp_unset_page_free(page); | |
f623f0db | 2365 | } |
1da177e4 | 2366 | |
b2a0ac88 | 2367 | for_each_migratetype_order(order, t) { |
86760a2c GT |
2368 | list_for_each_entry(page, |
2369 | &zone->free_area[order].free_list[t], lru) { | |
f623f0db | 2370 | unsigned long i; |
1da177e4 | 2371 | |
86760a2c | 2372 | pfn = page_to_pfn(page); |
f623f0db | 2373 | for (i = 0; i < (1UL << order); i++) |
7be98234 | 2374 | swsusp_set_page_free(pfn_to_page(pfn + i)); |
f623f0db | 2375 | } |
b2a0ac88 | 2376 | } |
1da177e4 LT |
2377 | spin_unlock_irqrestore(&zone->lock, flags); |
2378 | } | |
e2c55dc8 | 2379 | #endif /* CONFIG_PM */ |
1da177e4 | 2380 | |
1da177e4 LT |
2381 | /* |
2382 | * Free a 0-order page | |
b745bc85 | 2383 | * cold == true ? free a cold page : free a hot page |
1da177e4 | 2384 | */ |
b745bc85 | 2385 | void free_hot_cold_page(struct page *page, bool cold) |
1da177e4 LT |
2386 | { |
2387 | struct zone *zone = page_zone(page); | |
2388 | struct per_cpu_pages *pcp; | |
2389 | unsigned long flags; | |
dc4b0caf | 2390 | unsigned long pfn = page_to_pfn(page); |
5f8dcc21 | 2391 | int migratetype; |
1da177e4 | 2392 | |
4db7548c | 2393 | if (!free_pcp_prepare(page)) |
689bcebf HD |
2394 | return; |
2395 | ||
dc4b0caf | 2396 | migratetype = get_pfnblock_migratetype(page, pfn); |
bb14c2c7 | 2397 | set_pcppage_migratetype(page, migratetype); |
1da177e4 | 2398 | local_irq_save(flags); |
f8891e5e | 2399 | __count_vm_event(PGFREE); |
da456f14 | 2400 | |
5f8dcc21 MG |
2401 | /* |
2402 | * We only track unmovable, reclaimable and movable on pcp lists. | |
2403 | * Free ISOLATE pages back to the allocator because they are being | |
2404 | * offlined but treat RESERVE as movable pages so we can get those | |
2405 | * areas back if necessary. Otherwise, we may have to free | |
2406 | * excessively into the page allocator | |
2407 | */ | |
2408 | if (migratetype >= MIGRATE_PCPTYPES) { | |
194159fb | 2409 | if (unlikely(is_migrate_isolate(migratetype))) { |
dc4b0caf | 2410 | free_one_page(zone, page, pfn, 0, migratetype); |
5f8dcc21 MG |
2411 | goto out; |
2412 | } | |
2413 | migratetype = MIGRATE_MOVABLE; | |
2414 | } | |
2415 | ||
99dcc3e5 | 2416 | pcp = &this_cpu_ptr(zone->pageset)->pcp; |
b745bc85 | 2417 | if (!cold) |
5f8dcc21 | 2418 | list_add(&page->lru, &pcp->lists[migratetype]); |
b745bc85 MG |
2419 | else |
2420 | list_add_tail(&page->lru, &pcp->lists[migratetype]); | |
1da177e4 | 2421 | pcp->count++; |
48db57f8 | 2422 | if (pcp->count >= pcp->high) { |
4db0c3c2 | 2423 | unsigned long batch = READ_ONCE(pcp->batch); |
998d39cb CS |
2424 | free_pcppages_bulk(zone, batch, pcp); |
2425 | pcp->count -= batch; | |
48db57f8 | 2426 | } |
5f8dcc21 MG |
2427 | |
2428 | out: | |
1da177e4 | 2429 | local_irq_restore(flags); |
1da177e4 LT |
2430 | } |
2431 | ||
cc59850e KK |
2432 | /* |
2433 | * Free a list of 0-order pages | |
2434 | */ | |
b745bc85 | 2435 | void free_hot_cold_page_list(struct list_head *list, bool cold) |
cc59850e KK |
2436 | { |
2437 | struct page *page, *next; | |
2438 | ||
2439 | list_for_each_entry_safe(page, next, list, lru) { | |
b413d48a | 2440 | trace_mm_page_free_batched(page, cold); |
cc59850e KK |
2441 | free_hot_cold_page(page, cold); |
2442 | } | |
2443 | } | |
2444 | ||
8dfcc9ba NP |
2445 | /* |
2446 | * split_page takes a non-compound higher-order page, and splits it into | |
2447 | * n (1<<order) sub-pages: page[0..n] | |
2448 | * Each sub-page must be freed individually. | |
2449 | * | |
2450 | * Note: this is probably too low level an operation for use in drivers. | |
2451 | * Please consult with lkml before using this in your driver. | |
2452 | */ | |
2453 | void split_page(struct page *page, unsigned int order) | |
2454 | { | |
2455 | int i; | |
e2cfc911 | 2456 | gfp_t gfp_mask; |
8dfcc9ba | 2457 | |
309381fe SL |
2458 | VM_BUG_ON_PAGE(PageCompound(page), page); |
2459 | VM_BUG_ON_PAGE(!page_count(page), page); | |
b1eeab67 VN |
2460 | |
2461 | #ifdef CONFIG_KMEMCHECK | |
2462 | /* | |
2463 | * Split shadow pages too, because free(page[0]) would | |
2464 | * otherwise free the whole shadow. | |
2465 | */ | |
2466 | if (kmemcheck_page_is_tracked(page)) | |
2467 | split_page(virt_to_page(page[0].shadow), order); | |
2468 | #endif | |
2469 | ||
e2cfc911 JK |
2470 | gfp_mask = get_page_owner_gfp(page); |
2471 | set_page_owner(page, 0, gfp_mask); | |
48c96a36 | 2472 | for (i = 1; i < (1 << order); i++) { |
7835e98b | 2473 | set_page_refcounted(page + i); |
e2cfc911 | 2474 | set_page_owner(page + i, 0, gfp_mask); |
48c96a36 | 2475 | } |
8dfcc9ba | 2476 | } |
5853ff23 | 2477 | EXPORT_SYMBOL_GPL(split_page); |
8dfcc9ba | 2478 | |
3c605096 | 2479 | int __isolate_free_page(struct page *page, unsigned int order) |
748446bb | 2480 | { |
748446bb MG |
2481 | unsigned long watermark; |
2482 | struct zone *zone; | |
2139cbe6 | 2483 | int mt; |
748446bb MG |
2484 | |
2485 | BUG_ON(!PageBuddy(page)); | |
2486 | ||
2487 | zone = page_zone(page); | |
2e30abd1 | 2488 | mt = get_pageblock_migratetype(page); |
748446bb | 2489 | |
194159fb | 2490 | if (!is_migrate_isolate(mt)) { |
2e30abd1 MS |
2491 | /* Obey watermarks as if the page was being allocated */ |
2492 | watermark = low_wmark_pages(zone) + (1 << order); | |
2493 | if (!zone_watermark_ok(zone, 0, watermark, 0, 0)) | |
2494 | return 0; | |
2495 | ||
8fb74b9f | 2496 | __mod_zone_freepage_state(zone, -(1UL << order), mt); |
2e30abd1 | 2497 | } |
748446bb MG |
2498 | |
2499 | /* Remove page from free list */ | |
2500 | list_del(&page->lru); | |
2501 | zone->free_area[order].nr_free--; | |
2502 | rmv_page_order(page); | |
2139cbe6 | 2503 | |
e2cfc911 | 2504 | set_page_owner(page, order, __GFP_MOVABLE); |
f3a14ced | 2505 | |
8fb74b9f | 2506 | /* Set the pageblock if the isolated page is at least a pageblock */ |
748446bb MG |
2507 | if (order >= pageblock_order - 1) { |
2508 | struct page *endpage = page + (1 << order) - 1; | |
47118af0 MN |
2509 | for (; page < endpage; page += pageblock_nr_pages) { |
2510 | int mt = get_pageblock_migratetype(page); | |
194159fb | 2511 | if (!is_migrate_isolate(mt) && !is_migrate_cma(mt)) |
47118af0 MN |
2512 | set_pageblock_migratetype(page, |
2513 | MIGRATE_MOVABLE); | |
2514 | } | |
748446bb MG |
2515 | } |
2516 | ||
f3a14ced | 2517 | |
8fb74b9f | 2518 | return 1UL << order; |
1fb3f8ca MG |
2519 | } |
2520 | ||
2521 | /* | |
2522 | * Similar to split_page except the page is already free. As this is only | |
2523 | * being used for migration, the migratetype of the block also changes. | |
2524 | * As this is called with interrupts disabled, the caller is responsible | |
2525 | * for calling arch_alloc_page() and kernel_map_page() after interrupts | |
2526 | * are enabled. | |
2527 | * | |
2528 | * Note: this is probably too low level an operation for use in drivers. | |
2529 | * Please consult with lkml before using this in your driver. | |
2530 | */ | |
2531 | int split_free_page(struct page *page) | |
2532 | { | |
2533 | unsigned int order; | |
2534 | int nr_pages; | |
2535 | ||
1fb3f8ca MG |
2536 | order = page_order(page); |
2537 | ||
8fb74b9f | 2538 | nr_pages = __isolate_free_page(page, order); |
1fb3f8ca MG |
2539 | if (!nr_pages) |
2540 | return 0; | |
2541 | ||
2542 | /* Split into individual pages */ | |
2543 | set_page_refcounted(page); | |
2544 | split_page(page, order); | |
2545 | return nr_pages; | |
748446bb MG |
2546 | } |
2547 | ||
060e7417 MG |
2548 | /* |
2549 | * Update NUMA hit/miss statistics | |
2550 | * | |
2551 | * Must be called with interrupts disabled. | |
2552 | * | |
2553 | * When __GFP_OTHER_NODE is set assume the node of the preferred | |
2554 | * zone is the local node. This is useful for daemons who allocate | |
2555 | * memory on behalf of other processes. | |
2556 | */ | |
2557 | static inline void zone_statistics(struct zone *preferred_zone, struct zone *z, | |
2558 | gfp_t flags) | |
2559 | { | |
2560 | #ifdef CONFIG_NUMA | |
2561 | int local_nid = numa_node_id(); | |
2562 | enum zone_stat_item local_stat = NUMA_LOCAL; | |
2563 | ||
2564 | if (unlikely(flags & __GFP_OTHER_NODE)) { | |
2565 | local_stat = NUMA_OTHER; | |
2566 | local_nid = preferred_zone->node; | |
2567 | } | |
2568 | ||
2569 | if (z->node == local_nid) { | |
2570 | __inc_zone_state(z, NUMA_HIT); | |
2571 | __inc_zone_state(z, local_stat); | |
2572 | } else { | |
2573 | __inc_zone_state(z, NUMA_MISS); | |
2574 | __inc_zone_state(preferred_zone, NUMA_FOREIGN); | |
2575 | } | |
2576 | #endif | |
2577 | } | |
2578 | ||
1da177e4 | 2579 | /* |
75379191 | 2580 | * Allocate a page from the given zone. Use pcplists for order-0 allocations. |
1da177e4 | 2581 | */ |
0a15c3e9 MG |
2582 | static inline |
2583 | struct page *buffered_rmqueue(struct zone *preferred_zone, | |
7aeb09f9 | 2584 | struct zone *zone, unsigned int order, |
c603844b MG |
2585 | gfp_t gfp_flags, unsigned int alloc_flags, |
2586 | int migratetype) | |
1da177e4 LT |
2587 | { |
2588 | unsigned long flags; | |
689bcebf | 2589 | struct page *page; |
b745bc85 | 2590 | bool cold = ((gfp_flags & __GFP_COLD) != 0); |
1da177e4 | 2591 | |
48db57f8 | 2592 | if (likely(order == 0)) { |
1da177e4 | 2593 | struct per_cpu_pages *pcp; |
5f8dcc21 | 2594 | struct list_head *list; |
1da177e4 | 2595 | |
1da177e4 | 2596 | local_irq_save(flags); |
479f854a MG |
2597 | do { |
2598 | pcp = &this_cpu_ptr(zone->pageset)->pcp; | |
2599 | list = &pcp->lists[migratetype]; | |
2600 | if (list_empty(list)) { | |
2601 | pcp->count += rmqueue_bulk(zone, 0, | |
2602 | pcp->batch, list, | |
2603 | migratetype, cold); | |
2604 | if (unlikely(list_empty(list))) | |
2605 | goto failed; | |
2606 | } | |
b92a6edd | 2607 | |
479f854a MG |
2608 | if (cold) |
2609 | page = list_last_entry(list, struct page, lru); | |
2610 | else | |
2611 | page = list_first_entry(list, struct page, lru); | |
2612 | } while (page && check_new_pcp(page)); | |
5f8dcc21 | 2613 | |
754078eb | 2614 | __dec_zone_state(zone, NR_ALLOC_BATCH); |
b92a6edd MG |
2615 | list_del(&page->lru); |
2616 | pcp->count--; | |
7fb1d9fc | 2617 | } else { |
0f352e53 MH |
2618 | /* |
2619 | * We most definitely don't want callers attempting to | |
2620 | * allocate greater than order-1 page units with __GFP_NOFAIL. | |
2621 | */ | |
2622 | WARN_ON_ONCE((gfp_flags & __GFP_NOFAIL) && (order > 1)); | |
1da177e4 | 2623 | spin_lock_irqsave(&zone->lock, flags); |
0aaa29a5 | 2624 | |
479f854a MG |
2625 | do { |
2626 | page = NULL; | |
2627 | if (alloc_flags & ALLOC_HARDER) { | |
2628 | page = __rmqueue_smallest(zone, order, MIGRATE_HIGHATOMIC); | |
2629 | if (page) | |
2630 | trace_mm_page_alloc_zone_locked(page, order, migratetype); | |
2631 | } | |
2632 | if (!page) | |
2633 | page = __rmqueue(zone, order, migratetype); | |
2634 | } while (page && check_new_pages(page, order)); | |
a74609fa NP |
2635 | spin_unlock(&zone->lock); |
2636 | if (!page) | |
2637 | goto failed; | |
754078eb | 2638 | __mod_zone_page_state(zone, NR_ALLOC_BATCH, -(1 << order)); |
d1ce749a | 2639 | __mod_zone_freepage_state(zone, -(1 << order), |
bb14c2c7 | 2640 | get_pcppage_migratetype(page)); |
1da177e4 LT |
2641 | } |
2642 | ||
abe5f972 | 2643 | if (atomic_long_read(&zone->vm_stat[NR_ALLOC_BATCH]) <= 0 && |
57054651 JW |
2644 | !test_bit(ZONE_FAIR_DEPLETED, &zone->flags)) |
2645 | set_bit(ZONE_FAIR_DEPLETED, &zone->flags); | |
27329369 | 2646 | |
f8891e5e | 2647 | __count_zone_vm_events(PGALLOC, zone, 1 << order); |
78afd561 | 2648 | zone_statistics(preferred_zone, zone, gfp_flags); |
a74609fa | 2649 | local_irq_restore(flags); |
1da177e4 | 2650 | |
309381fe | 2651 | VM_BUG_ON_PAGE(bad_range(zone, page), page); |
1da177e4 | 2652 | return page; |
a74609fa NP |
2653 | |
2654 | failed: | |
2655 | local_irq_restore(flags); | |
a74609fa | 2656 | return NULL; |
1da177e4 LT |
2657 | } |
2658 | ||
933e312e AM |
2659 | #ifdef CONFIG_FAIL_PAGE_ALLOC |
2660 | ||
b2588c4b | 2661 | static struct { |
933e312e AM |
2662 | struct fault_attr attr; |
2663 | ||
621a5f7a | 2664 | bool ignore_gfp_highmem; |
71baba4b | 2665 | bool ignore_gfp_reclaim; |
54114994 | 2666 | u32 min_order; |
933e312e AM |
2667 | } fail_page_alloc = { |
2668 | .attr = FAULT_ATTR_INITIALIZER, | |
71baba4b | 2669 | .ignore_gfp_reclaim = true, |
621a5f7a | 2670 | .ignore_gfp_highmem = true, |
54114994 | 2671 | .min_order = 1, |
933e312e AM |
2672 | }; |
2673 | ||
2674 | static int __init setup_fail_page_alloc(char *str) | |
2675 | { | |
2676 | return setup_fault_attr(&fail_page_alloc.attr, str); | |
2677 | } | |
2678 | __setup("fail_page_alloc=", setup_fail_page_alloc); | |
2679 | ||
deaf386e | 2680 | static bool should_fail_alloc_page(gfp_t gfp_mask, unsigned int order) |
933e312e | 2681 | { |
54114994 | 2682 | if (order < fail_page_alloc.min_order) |
deaf386e | 2683 | return false; |
933e312e | 2684 | if (gfp_mask & __GFP_NOFAIL) |
deaf386e | 2685 | return false; |
933e312e | 2686 | if (fail_page_alloc.ignore_gfp_highmem && (gfp_mask & __GFP_HIGHMEM)) |
deaf386e | 2687 | return false; |
71baba4b MG |
2688 | if (fail_page_alloc.ignore_gfp_reclaim && |
2689 | (gfp_mask & __GFP_DIRECT_RECLAIM)) | |
deaf386e | 2690 | return false; |
933e312e AM |
2691 | |
2692 | return should_fail(&fail_page_alloc.attr, 1 << order); | |
2693 | } | |
2694 | ||
2695 | #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS | |
2696 | ||
2697 | static int __init fail_page_alloc_debugfs(void) | |
2698 | { | |
f4ae40a6 | 2699 | umode_t mode = S_IFREG | S_IRUSR | S_IWUSR; |
933e312e | 2700 | struct dentry *dir; |
933e312e | 2701 | |
dd48c085 AM |
2702 | dir = fault_create_debugfs_attr("fail_page_alloc", NULL, |
2703 | &fail_page_alloc.attr); | |
2704 | if (IS_ERR(dir)) | |
2705 | return PTR_ERR(dir); | |
933e312e | 2706 | |
b2588c4b | 2707 | if (!debugfs_create_bool("ignore-gfp-wait", mode, dir, |
71baba4b | 2708 | &fail_page_alloc.ignore_gfp_reclaim)) |
b2588c4b AM |
2709 | goto fail; |
2710 | if (!debugfs_create_bool("ignore-gfp-highmem", mode, dir, | |
2711 | &fail_page_alloc.ignore_gfp_highmem)) | |
2712 | goto fail; | |
2713 | if (!debugfs_create_u32("min-order", mode, dir, | |
2714 | &fail_page_alloc.min_order)) | |
2715 | goto fail; | |
2716 | ||
2717 | return 0; | |
2718 | fail: | |
dd48c085 | 2719 | debugfs_remove_recursive(dir); |
933e312e | 2720 | |
b2588c4b | 2721 | return -ENOMEM; |
933e312e AM |
2722 | } |
2723 | ||
2724 | late_initcall(fail_page_alloc_debugfs); | |
2725 | ||
2726 | #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */ | |
2727 | ||
2728 | #else /* CONFIG_FAIL_PAGE_ALLOC */ | |
2729 | ||
deaf386e | 2730 | static inline bool should_fail_alloc_page(gfp_t gfp_mask, unsigned int order) |
933e312e | 2731 | { |
deaf386e | 2732 | return false; |
933e312e AM |
2733 | } |
2734 | ||
2735 | #endif /* CONFIG_FAIL_PAGE_ALLOC */ | |
2736 | ||
1da177e4 | 2737 | /* |
97a16fc8 MG |
2738 | * Return true if free base pages are above 'mark'. For high-order checks it |
2739 | * will return true of the order-0 watermark is reached and there is at least | |
2740 | * one free page of a suitable size. Checking now avoids taking the zone lock | |
2741 | * to check in the allocation paths if no pages are free. | |
1da177e4 | 2742 | */ |
86a294a8 MH |
2743 | bool __zone_watermark_ok(struct zone *z, unsigned int order, unsigned long mark, |
2744 | int classzone_idx, unsigned int alloc_flags, | |
2745 | long free_pages) | |
1da177e4 | 2746 | { |
d23ad423 | 2747 | long min = mark; |
1da177e4 | 2748 | int o; |
c603844b | 2749 | const bool alloc_harder = (alloc_flags & ALLOC_HARDER); |
1da177e4 | 2750 | |
0aaa29a5 | 2751 | /* free_pages may go negative - that's OK */ |
df0a6daa | 2752 | free_pages -= (1 << order) - 1; |
0aaa29a5 | 2753 | |
7fb1d9fc | 2754 | if (alloc_flags & ALLOC_HIGH) |
1da177e4 | 2755 | min -= min / 2; |
0aaa29a5 MG |
2756 | |
2757 | /* | |
2758 | * If the caller does not have rights to ALLOC_HARDER then subtract | |
2759 | * the high-atomic reserves. This will over-estimate the size of the | |
2760 | * atomic reserve but it avoids a search. | |
2761 | */ | |
97a16fc8 | 2762 | if (likely(!alloc_harder)) |
0aaa29a5 MG |
2763 | free_pages -= z->nr_reserved_highatomic; |
2764 | else | |
1da177e4 | 2765 | min -= min / 4; |
e2b19197 | 2766 | |
d95ea5d1 BZ |
2767 | #ifdef CONFIG_CMA |
2768 | /* If allocation can't use CMA areas don't use free CMA pages */ | |
2769 | if (!(alloc_flags & ALLOC_CMA)) | |
97a16fc8 | 2770 | free_pages -= zone_page_state(z, NR_FREE_CMA_PAGES); |
d95ea5d1 | 2771 | #endif |
026b0814 | 2772 | |
97a16fc8 MG |
2773 | /* |
2774 | * Check watermarks for an order-0 allocation request. If these | |
2775 | * are not met, then a high-order request also cannot go ahead | |
2776 | * even if a suitable page happened to be free. | |
2777 | */ | |
2778 | if (free_pages <= min + z->lowmem_reserve[classzone_idx]) | |
88f5acf8 | 2779 | return false; |
1da177e4 | 2780 | |
97a16fc8 MG |
2781 | /* If this is an order-0 request then the watermark is fine */ |
2782 | if (!order) | |
2783 | return true; | |
2784 | ||
2785 | /* For a high-order request, check at least one suitable page is free */ | |
2786 | for (o = order; o < MAX_ORDER; o++) { | |
2787 | struct free_area *area = &z->free_area[o]; | |
2788 | int mt; | |
2789 | ||
2790 | if (!area->nr_free) | |
2791 | continue; | |
2792 | ||
2793 | if (alloc_harder) | |
2794 | return true; | |
1da177e4 | 2795 | |
97a16fc8 MG |
2796 | for (mt = 0; mt < MIGRATE_PCPTYPES; mt++) { |
2797 | if (!list_empty(&area->free_list[mt])) | |
2798 | return true; | |
2799 | } | |
2800 | ||
2801 | #ifdef CONFIG_CMA | |
2802 | if ((alloc_flags & ALLOC_CMA) && | |
2803 | !list_empty(&area->free_list[MIGRATE_CMA])) { | |
2804 | return true; | |
2805 | } | |
2806 | #endif | |
1da177e4 | 2807 | } |
97a16fc8 | 2808 | return false; |
88f5acf8 MG |
2809 | } |
2810 | ||
7aeb09f9 | 2811 | bool zone_watermark_ok(struct zone *z, unsigned int order, unsigned long mark, |
c603844b | 2812 | int classzone_idx, unsigned int alloc_flags) |
88f5acf8 MG |
2813 | { |
2814 | return __zone_watermark_ok(z, order, mark, classzone_idx, alloc_flags, | |
2815 | zone_page_state(z, NR_FREE_PAGES)); | |
2816 | } | |
2817 | ||
48ee5f36 MG |
2818 | static inline bool zone_watermark_fast(struct zone *z, unsigned int order, |
2819 | unsigned long mark, int classzone_idx, unsigned int alloc_flags) | |
2820 | { | |
2821 | long free_pages = zone_page_state(z, NR_FREE_PAGES); | |
2822 | long cma_pages = 0; | |
2823 | ||
2824 | #ifdef CONFIG_CMA | |
2825 | /* If allocation can't use CMA areas don't use free CMA pages */ | |
2826 | if (!(alloc_flags & ALLOC_CMA)) | |
2827 | cma_pages = zone_page_state(z, NR_FREE_CMA_PAGES); | |
2828 | #endif | |
2829 | ||
2830 | /* | |
2831 | * Fast check for order-0 only. If this fails then the reserves | |
2832 | * need to be calculated. There is a corner case where the check | |
2833 | * passes but only the high-order atomic reserve are free. If | |
2834 | * the caller is !atomic then it'll uselessly search the free | |
2835 | * list. That corner case is then slower but it is harmless. | |
2836 | */ | |
2837 | if (!order && (free_pages - cma_pages) > mark + z->lowmem_reserve[classzone_idx]) | |
2838 | return true; | |
2839 | ||
2840 | return __zone_watermark_ok(z, order, mark, classzone_idx, alloc_flags, | |
2841 | free_pages); | |
2842 | } | |
2843 | ||
7aeb09f9 | 2844 | bool zone_watermark_ok_safe(struct zone *z, unsigned int order, |
e2b19197 | 2845 | unsigned long mark, int classzone_idx) |
88f5acf8 MG |
2846 | { |
2847 | long free_pages = zone_page_state(z, NR_FREE_PAGES); | |
2848 | ||
2849 | if (z->percpu_drift_mark && free_pages < z->percpu_drift_mark) | |
2850 | free_pages = zone_page_state_snapshot(z, NR_FREE_PAGES); | |
2851 | ||
e2b19197 | 2852 | return __zone_watermark_ok(z, order, mark, classzone_idx, 0, |
88f5acf8 | 2853 | free_pages); |
1da177e4 LT |
2854 | } |
2855 | ||
9276b1bc | 2856 | #ifdef CONFIG_NUMA |
81c0a2bb JW |
2857 | static bool zone_local(struct zone *local_zone, struct zone *zone) |
2858 | { | |
fff4068c | 2859 | return local_zone->node == zone->node; |
81c0a2bb JW |
2860 | } |
2861 | ||
957f822a DR |
2862 | static bool zone_allows_reclaim(struct zone *local_zone, struct zone *zone) |
2863 | { | |
5f7a75ac MG |
2864 | return node_distance(zone_to_nid(local_zone), zone_to_nid(zone)) < |
2865 | RECLAIM_DISTANCE; | |
957f822a | 2866 | } |
9276b1bc | 2867 | #else /* CONFIG_NUMA */ |
81c0a2bb JW |
2868 | static bool zone_local(struct zone *local_zone, struct zone *zone) |
2869 | { | |
2870 | return true; | |
2871 | } | |
2872 | ||
957f822a DR |
2873 | static bool zone_allows_reclaim(struct zone *local_zone, struct zone *zone) |
2874 | { | |
2875 | return true; | |
2876 | } | |
9276b1bc PJ |
2877 | #endif /* CONFIG_NUMA */ |
2878 | ||
4ffeaf35 MG |
2879 | static void reset_alloc_batches(struct zone *preferred_zone) |
2880 | { | |
2881 | struct zone *zone = preferred_zone->zone_pgdat->node_zones; | |
2882 | ||
2883 | do { | |
2884 | mod_zone_page_state(zone, NR_ALLOC_BATCH, | |
2885 | high_wmark_pages(zone) - low_wmark_pages(zone) - | |
2886 | atomic_long_read(&zone->vm_stat[NR_ALLOC_BATCH])); | |
57054651 | 2887 | clear_bit(ZONE_FAIR_DEPLETED, &zone->flags); |
4ffeaf35 MG |
2888 | } while (zone++ != preferred_zone); |
2889 | } | |
2890 | ||
7fb1d9fc | 2891 | /* |
0798e519 | 2892 | * get_page_from_freelist goes through the zonelist trying to allocate |
7fb1d9fc RS |
2893 | * a page. |
2894 | */ | |
2895 | static struct page * | |
a9263751 VB |
2896 | get_page_from_freelist(gfp_t gfp_mask, unsigned int order, int alloc_flags, |
2897 | const struct alloc_context *ac) | |
753ee728 | 2898 | { |
c33d6c06 | 2899 | struct zoneref *z = ac->preferred_zoneref; |
5117f45d | 2900 | struct zone *zone; |
30534755 MG |
2901 | bool fair_skipped = false; |
2902 | bool apply_fair = (alloc_flags & ALLOC_FAIR); | |
54a6eb5c | 2903 | |
9276b1bc | 2904 | zonelist_scan: |
7fb1d9fc | 2905 | /* |
9276b1bc | 2906 | * Scan zonelist, looking for a zone with enough free. |
344736f2 | 2907 | * See also __cpuset_node_allowed() comment in kernel/cpuset.c. |
7fb1d9fc | 2908 | */ |
c33d6c06 | 2909 | for_next_zone_zonelist_nodemask(zone, z, ac->zonelist, ac->high_zoneidx, |
a9263751 | 2910 | ac->nodemask) { |
be06af00 | 2911 | struct page *page; |
e085dbc5 JW |
2912 | unsigned long mark; |
2913 | ||
664eedde MG |
2914 | if (cpusets_enabled() && |
2915 | (alloc_flags & ALLOC_CPUSET) && | |
002f2906 | 2916 | !__cpuset_zone_allowed(zone, gfp_mask)) |
cd38b115 | 2917 | continue; |
81c0a2bb JW |
2918 | /* |
2919 | * Distribute pages in proportion to the individual | |
2920 | * zone size to ensure fair page aging. The zone a | |
2921 | * page was allocated in should have no effect on the | |
2922 | * time the page has in memory before being reclaimed. | |
81c0a2bb | 2923 | */ |
30534755 | 2924 | if (apply_fair) { |
57054651 | 2925 | if (test_bit(ZONE_FAIR_DEPLETED, &zone->flags)) { |
fa379b95 | 2926 | fair_skipped = true; |
3a025760 | 2927 | continue; |
4ffeaf35 | 2928 | } |
c33d6c06 | 2929 | if (!zone_local(ac->preferred_zoneref->zone, zone)) { |
30534755 MG |
2930 | if (fair_skipped) |
2931 | goto reset_fair; | |
2932 | apply_fair = false; | |
2933 | } | |
81c0a2bb | 2934 | } |
a756cf59 JW |
2935 | /* |
2936 | * When allocating a page cache page for writing, we | |
2937 | * want to get it from a zone that is within its dirty | |
2938 | * limit, such that no single zone holds more than its | |
2939 | * proportional share of globally allowed dirty pages. | |
2940 | * The dirty limits take into account the zone's | |
2941 | * lowmem reserves and high watermark so that kswapd | |
2942 | * should be able to balance it without having to | |
2943 | * write pages from its LRU list. | |
2944 | * | |
2945 | * This may look like it could increase pressure on | |
2946 | * lower zones by failing allocations in higher zones | |
2947 | * before they are full. But the pages that do spill | |
2948 | * over are limited as the lower zones are protected | |
2949 | * by this very same mechanism. It should not become | |
2950 | * a practical burden to them. | |
2951 | * | |
2952 | * XXX: For now, allow allocations to potentially | |
2953 | * exceed the per-zone dirty limit in the slowpath | |
c9ab0c4f | 2954 | * (spread_dirty_pages unset) before going into reclaim, |
a756cf59 JW |
2955 | * which is important when on a NUMA setup the allowed |
2956 | * zones are together not big enough to reach the | |
2957 | * global limit. The proper fix for these situations | |
2958 | * will require awareness of zones in the | |
2959 | * dirty-throttling and the flusher threads. | |
2960 | */ | |
c9ab0c4f | 2961 | if (ac->spread_dirty_pages && !zone_dirty_ok(zone)) |
800a1e75 | 2962 | continue; |
7fb1d9fc | 2963 | |
e085dbc5 | 2964 | mark = zone->watermark[alloc_flags & ALLOC_WMARK_MASK]; |
48ee5f36 | 2965 | if (!zone_watermark_fast(zone, order, mark, |
93ea9964 | 2966 | ac_classzone_idx(ac), alloc_flags)) { |
fa5e084e MG |
2967 | int ret; |
2968 | ||
5dab2911 MG |
2969 | /* Checked here to keep the fast path fast */ |
2970 | BUILD_BUG_ON(ALLOC_NO_WATERMARKS < NR_WMARK); | |
2971 | if (alloc_flags & ALLOC_NO_WATERMARKS) | |
2972 | goto try_this_zone; | |
2973 | ||
957f822a | 2974 | if (zone_reclaim_mode == 0 || |
c33d6c06 | 2975 | !zone_allows_reclaim(ac->preferred_zoneref->zone, zone)) |
cd38b115 MG |
2976 | continue; |
2977 | ||
fa5e084e MG |
2978 | ret = zone_reclaim(zone, gfp_mask, order); |
2979 | switch (ret) { | |
2980 | case ZONE_RECLAIM_NOSCAN: | |
2981 | /* did not scan */ | |
cd38b115 | 2982 | continue; |
fa5e084e MG |
2983 | case ZONE_RECLAIM_FULL: |
2984 | /* scanned but unreclaimable */ | |
cd38b115 | 2985 | continue; |
fa5e084e MG |
2986 | default: |
2987 | /* did we reclaim enough */ | |
fed2719e | 2988 | if (zone_watermark_ok(zone, order, mark, |
93ea9964 | 2989 | ac_classzone_idx(ac), alloc_flags)) |
fed2719e MG |
2990 | goto try_this_zone; |
2991 | ||
fed2719e | 2992 | continue; |
0798e519 | 2993 | } |
7fb1d9fc RS |
2994 | } |
2995 | ||
fa5e084e | 2996 | try_this_zone: |
c33d6c06 | 2997 | page = buffered_rmqueue(ac->preferred_zoneref->zone, zone, order, |
0aaa29a5 | 2998 | gfp_mask, alloc_flags, ac->migratetype); |
75379191 | 2999 | if (page) { |
479f854a | 3000 | prep_new_page(page, order, gfp_mask, alloc_flags); |
0aaa29a5 MG |
3001 | |
3002 | /* | |
3003 | * If this is a high-order atomic allocation then check | |
3004 | * if the pageblock should be reserved for the future | |
3005 | */ | |
3006 | if (unlikely(order && (alloc_flags & ALLOC_HARDER))) | |
3007 | reserve_highatomic_pageblock(page, zone, order); | |
3008 | ||
75379191 VB |
3009 | return page; |
3010 | } | |
54a6eb5c | 3011 | } |
9276b1bc | 3012 | |
4ffeaf35 MG |
3013 | /* |
3014 | * The first pass makes sure allocations are spread fairly within the | |
3015 | * local node. However, the local node might have free pages left | |
3016 | * after the fairness batches are exhausted, and remote zones haven't | |
3017 | * even been considered yet. Try once more without fairness, and | |
3018 | * include remote zones now, before entering the slowpath and waking | |
3019 | * kswapd: prefer spilling to a remote zone over swapping locally. | |
3020 | */ | |
30534755 MG |
3021 | if (fair_skipped) { |
3022 | reset_fair: | |
3023 | apply_fair = false; | |
3024 | fair_skipped = false; | |
c33d6c06 | 3025 | reset_alloc_batches(ac->preferred_zoneref->zone); |
4ffeaf35 | 3026 | goto zonelist_scan; |
30534755 | 3027 | } |
4ffeaf35 MG |
3028 | |
3029 | return NULL; | |
753ee728 MH |
3030 | } |
3031 | ||
29423e77 DR |
3032 | /* |
3033 | * Large machines with many possible nodes should not always dump per-node | |
3034 | * meminfo in irq context. | |
3035 | */ | |
3036 | static inline bool should_suppress_show_mem(void) | |
3037 | { | |
3038 | bool ret = false; | |
3039 | ||
3040 | #if NODES_SHIFT > 8 | |
3041 | ret = in_interrupt(); | |
3042 | #endif | |
3043 | return ret; | |
3044 | } | |
3045 | ||
a238ab5b DH |
3046 | static DEFINE_RATELIMIT_STATE(nopage_rs, |
3047 | DEFAULT_RATELIMIT_INTERVAL, | |
3048 | DEFAULT_RATELIMIT_BURST); | |
3049 | ||
d00181b9 | 3050 | void warn_alloc_failed(gfp_t gfp_mask, unsigned int order, const char *fmt, ...) |
a238ab5b | 3051 | { |
a238ab5b DH |
3052 | unsigned int filter = SHOW_MEM_FILTER_NODES; |
3053 | ||
c0a32fc5 SG |
3054 | if ((gfp_mask & __GFP_NOWARN) || !__ratelimit(&nopage_rs) || |
3055 | debug_guardpage_minorder() > 0) | |
a238ab5b DH |
3056 | return; |
3057 | ||
3058 | /* | |
3059 | * This documents exceptions given to allocations in certain | |
3060 | * contexts that are allowed to allocate outside current's set | |
3061 | * of allowed nodes. | |
3062 | */ | |
3063 | if (!(gfp_mask & __GFP_NOMEMALLOC)) | |
3064 | if (test_thread_flag(TIF_MEMDIE) || | |
3065 | (current->flags & (PF_MEMALLOC | PF_EXITING))) | |
3066 | filter &= ~SHOW_MEM_FILTER_NODES; | |
d0164adc | 3067 | if (in_interrupt() || !(gfp_mask & __GFP_DIRECT_RECLAIM)) |
a238ab5b DH |
3068 | filter &= ~SHOW_MEM_FILTER_NODES; |
3069 | ||
3070 | if (fmt) { | |
3ee9a4f0 JP |
3071 | struct va_format vaf; |
3072 | va_list args; | |
3073 | ||
a238ab5b | 3074 | va_start(args, fmt); |
3ee9a4f0 JP |
3075 | |
3076 | vaf.fmt = fmt; | |
3077 | vaf.va = &args; | |
3078 | ||
3079 | pr_warn("%pV", &vaf); | |
3080 | ||
a238ab5b DH |
3081 | va_end(args); |
3082 | } | |
3083 | ||
c5c990e8 VB |
3084 | pr_warn("%s: page allocation failure: order:%u, mode:%#x(%pGg)\n", |
3085 | current->comm, order, gfp_mask, &gfp_mask); | |
a238ab5b DH |
3086 | dump_stack(); |
3087 | if (!should_suppress_show_mem()) | |
3088 | show_mem(filter); | |
3089 | } | |
3090 | ||
11e33f6a MG |
3091 | static inline struct page * |
3092 | __alloc_pages_may_oom(gfp_t gfp_mask, unsigned int order, | |
a9263751 | 3093 | const struct alloc_context *ac, unsigned long *did_some_progress) |
11e33f6a | 3094 | { |
6e0fc46d DR |
3095 | struct oom_control oc = { |
3096 | .zonelist = ac->zonelist, | |
3097 | .nodemask = ac->nodemask, | |
3098 | .gfp_mask = gfp_mask, | |
3099 | .order = order, | |
6e0fc46d | 3100 | }; |
11e33f6a MG |
3101 | struct page *page; |
3102 | ||
9879de73 JW |
3103 | *did_some_progress = 0; |
3104 | ||
9879de73 | 3105 | /* |
dc56401f JW |
3106 | * Acquire the oom lock. If that fails, somebody else is |
3107 | * making progress for us. | |
9879de73 | 3108 | */ |
dc56401f | 3109 | if (!mutex_trylock(&oom_lock)) { |
9879de73 | 3110 | *did_some_progress = 1; |
11e33f6a | 3111 | schedule_timeout_uninterruptible(1); |
1da177e4 LT |
3112 | return NULL; |
3113 | } | |
6b1de916 | 3114 | |
11e33f6a MG |
3115 | /* |
3116 | * Go through the zonelist yet one more time, keep very high watermark | |
3117 | * here, this is only to catch a parallel oom killing, we must fail if | |
3118 | * we're still under heavy pressure. | |
3119 | */ | |
a9263751 VB |
3120 | page = get_page_from_freelist(gfp_mask | __GFP_HARDWALL, order, |
3121 | ALLOC_WMARK_HIGH|ALLOC_CPUSET, ac); | |
7fb1d9fc | 3122 | if (page) |
11e33f6a MG |
3123 | goto out; |
3124 | ||
4365a567 | 3125 | if (!(gfp_mask & __GFP_NOFAIL)) { |
9879de73 JW |
3126 | /* Coredumps can quickly deplete all memory reserves */ |
3127 | if (current->flags & PF_DUMPCORE) | |
3128 | goto out; | |
4365a567 KH |
3129 | /* The OOM killer will not help higher order allocs */ |
3130 | if (order > PAGE_ALLOC_COSTLY_ORDER) | |
3131 | goto out; | |
03668b3c | 3132 | /* The OOM killer does not needlessly kill tasks for lowmem */ |
a9263751 | 3133 | if (ac->high_zoneidx < ZONE_NORMAL) |
03668b3c | 3134 | goto out; |
9083905a JW |
3135 | if (pm_suspended_storage()) |
3136 | goto out; | |
3da88fb3 MH |
3137 | /* |
3138 | * XXX: GFP_NOFS allocations should rather fail than rely on | |
3139 | * other request to make a forward progress. | |
3140 | * We are in an unfortunate situation where out_of_memory cannot | |
3141 | * do much for this context but let's try it to at least get | |
3142 | * access to memory reserved if the current task is killed (see | |
3143 | * out_of_memory). Once filesystems are ready to handle allocation | |
3144 | * failures more gracefully we should just bail out here. | |
3145 | */ | |
3146 | ||
4167e9b2 | 3147 | /* The OOM killer may not free memory on a specific node */ |
4365a567 KH |
3148 | if (gfp_mask & __GFP_THISNODE) |
3149 | goto out; | |
3150 | } | |
11e33f6a | 3151 | /* Exhausted what can be done so it's blamo time */ |
5020e285 | 3152 | if (out_of_memory(&oc) || WARN_ON_ONCE(gfp_mask & __GFP_NOFAIL)) { |
c32b3cbe | 3153 | *did_some_progress = 1; |
5020e285 MH |
3154 | |
3155 | if (gfp_mask & __GFP_NOFAIL) { | |
3156 | page = get_page_from_freelist(gfp_mask, order, | |
3157 | ALLOC_NO_WATERMARKS|ALLOC_CPUSET, ac); | |
3158 | /* | |
3159 | * fallback to ignore cpuset restriction if our nodes | |
3160 | * are depleted | |
3161 | */ | |
3162 | if (!page) | |
3163 | page = get_page_from_freelist(gfp_mask, order, | |
3164 | ALLOC_NO_WATERMARKS, ac); | |
3165 | } | |
3166 | } | |
11e33f6a | 3167 | out: |
dc56401f | 3168 | mutex_unlock(&oom_lock); |
11e33f6a MG |
3169 | return page; |
3170 | } | |
3171 | ||
33c2d214 MH |
3172 | |
3173 | /* | |
3174 | * Maximum number of compaction retries wit a progress before OOM | |
3175 | * killer is consider as the only way to move forward. | |
3176 | */ | |
3177 | #define MAX_COMPACT_RETRIES 16 | |
3178 | ||
56de7263 MG |
3179 | #ifdef CONFIG_COMPACTION |
3180 | /* Try memory compaction for high-order allocations before reclaim */ | |
3181 | static struct page * | |
3182 | __alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order, | |
c603844b | 3183 | unsigned int alloc_flags, const struct alloc_context *ac, |
c5d01d0d | 3184 | enum migrate_mode mode, enum compact_result *compact_result) |
56de7263 | 3185 | { |
98dd3b48 | 3186 | struct page *page; |
c5d01d0d | 3187 | int contended_compaction; |
53853e2d VB |
3188 | |
3189 | if (!order) | |
66199712 | 3190 | return NULL; |
66199712 | 3191 | |
c06b1fca | 3192 | current->flags |= PF_MEMALLOC; |
c5d01d0d MH |
3193 | *compact_result = try_to_compact_pages(gfp_mask, order, alloc_flags, ac, |
3194 | mode, &contended_compaction); | |
c06b1fca | 3195 | current->flags &= ~PF_MEMALLOC; |
56de7263 | 3196 | |
c5d01d0d | 3197 | if (*compact_result <= COMPACT_INACTIVE) |
98dd3b48 | 3198 | return NULL; |
53853e2d | 3199 | |
98dd3b48 VB |
3200 | /* |
3201 | * At least in one zone compaction wasn't deferred or skipped, so let's | |
3202 | * count a compaction stall | |
3203 | */ | |
3204 | count_vm_event(COMPACTSTALL); | |
8fb74b9f | 3205 | |
a9263751 VB |
3206 | page = get_page_from_freelist(gfp_mask, order, |
3207 | alloc_flags & ~ALLOC_NO_WATERMARKS, ac); | |
53853e2d | 3208 | |
98dd3b48 VB |
3209 | if (page) { |
3210 | struct zone *zone = page_zone(page); | |
53853e2d | 3211 | |
98dd3b48 VB |
3212 | zone->compact_blockskip_flush = false; |
3213 | compaction_defer_reset(zone, order, true); | |
3214 | count_vm_event(COMPACTSUCCESS); | |
3215 | return page; | |
3216 | } | |
56de7263 | 3217 | |
98dd3b48 VB |
3218 | /* |
3219 | * It's bad if compaction run occurs and fails. The most likely reason | |
3220 | * is that pages exist, but not enough to satisfy watermarks. | |
3221 | */ | |
3222 | count_vm_event(COMPACTFAIL); | |
66199712 | 3223 | |
c5d01d0d MH |
3224 | /* |
3225 | * In all zones where compaction was attempted (and not | |
3226 | * deferred or skipped), lock contention has been detected. | |
3227 | * For THP allocation we do not want to disrupt the others | |
3228 | * so we fallback to base pages instead. | |
3229 | */ | |
3230 | if (contended_compaction == COMPACT_CONTENDED_LOCK) | |
3231 | *compact_result = COMPACT_CONTENDED; | |
3232 | ||
3233 | /* | |
3234 | * If compaction was aborted due to need_resched(), we do not | |
3235 | * want to further increase allocation latency, unless it is | |
3236 | * khugepaged trying to collapse. | |
3237 | */ | |
3238 | if (contended_compaction == COMPACT_CONTENDED_SCHED | |
3239 | && !(current->flags & PF_KTHREAD)) | |
3240 | *compact_result = COMPACT_CONTENDED; | |
3241 | ||
98dd3b48 | 3242 | cond_resched(); |
56de7263 MG |
3243 | |
3244 | return NULL; | |
3245 | } | |
33c2d214 MH |
3246 | |
3247 | static inline bool | |
86a294a8 MH |
3248 | should_compact_retry(struct alloc_context *ac, int order, int alloc_flags, |
3249 | enum compact_result compact_result, enum migrate_mode *migrate_mode, | |
33c2d214 MH |
3250 | int compaction_retries) |
3251 | { | |
7854ea6c MH |
3252 | int max_retries = MAX_COMPACT_RETRIES; |
3253 | ||
33c2d214 MH |
3254 | if (!order) |
3255 | return false; | |
3256 | ||
3257 | /* | |
3258 | * compaction considers all the zone as desperately out of memory | |
3259 | * so it doesn't really make much sense to retry except when the | |
3260 | * failure could be caused by weak migration mode. | |
3261 | */ | |
3262 | if (compaction_failed(compact_result)) { | |
3263 | if (*migrate_mode == MIGRATE_ASYNC) { | |
3264 | *migrate_mode = MIGRATE_SYNC_LIGHT; | |
3265 | return true; | |
3266 | } | |
3267 | return false; | |
3268 | } | |
3269 | ||
3270 | /* | |
7854ea6c MH |
3271 | * make sure the compaction wasn't deferred or didn't bail out early |
3272 | * due to locks contention before we declare that we should give up. | |
86a294a8 MH |
3273 | * But do not retry if the given zonelist is not suitable for |
3274 | * compaction. | |
33c2d214 | 3275 | */ |
7854ea6c | 3276 | if (compaction_withdrawn(compact_result)) |
86a294a8 | 3277 | return compaction_zonelist_suitable(ac, order, alloc_flags); |
7854ea6c MH |
3278 | |
3279 | /* | |
3280 | * !costly requests are much more important than __GFP_REPEAT | |
3281 | * costly ones because they are de facto nofail and invoke OOM | |
3282 | * killer to move on while costly can fail and users are ready | |
3283 | * to cope with that. 1/4 retries is rather arbitrary but we | |
3284 | * would need much more detailed feedback from compaction to | |
3285 | * make a better decision. | |
3286 | */ | |
3287 | if (order > PAGE_ALLOC_COSTLY_ORDER) | |
3288 | max_retries /= 4; | |
3289 | if (compaction_retries <= max_retries) | |
3290 | return true; | |
33c2d214 MH |
3291 | |
3292 | return false; | |
3293 | } | |
56de7263 MG |
3294 | #else |
3295 | static inline struct page * | |
3296 | __alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order, | |
c603844b | 3297 | unsigned int alloc_flags, const struct alloc_context *ac, |
c5d01d0d | 3298 | enum migrate_mode mode, enum compact_result *compact_result) |
56de7263 | 3299 | { |
33c2d214 | 3300 | *compact_result = COMPACT_SKIPPED; |
56de7263 MG |
3301 | return NULL; |
3302 | } | |
33c2d214 MH |
3303 | |
3304 | static inline bool | |
86a294a8 MH |
3305 | should_compact_retry(struct alloc_context *ac, unsigned int order, int alloc_flags, |
3306 | enum compact_result compact_result, | |
33c2d214 MH |
3307 | enum migrate_mode *migrate_mode, |
3308 | int compaction_retries) | |
3309 | { | |
31e49bfd MH |
3310 | struct zone *zone; |
3311 | struct zoneref *z; | |
3312 | ||
3313 | if (!order || order > PAGE_ALLOC_COSTLY_ORDER) | |
3314 | return false; | |
3315 | ||
3316 | /* | |
3317 | * There are setups with compaction disabled which would prefer to loop | |
3318 | * inside the allocator rather than hit the oom killer prematurely. | |
3319 | * Let's give them a good hope and keep retrying while the order-0 | |
3320 | * watermarks are OK. | |
3321 | */ | |
3322 | for_each_zone_zonelist_nodemask(zone, z, ac->zonelist, ac->high_zoneidx, | |
3323 | ac->nodemask) { | |
3324 | if (zone_watermark_ok(zone, 0, min_wmark_pages(zone), | |
3325 | ac_classzone_idx(ac), alloc_flags)) | |
3326 | return true; | |
3327 | } | |
33c2d214 MH |
3328 | return false; |
3329 | } | |
56de7263 MG |
3330 | #endif /* CONFIG_COMPACTION */ |
3331 | ||
bba90710 MS |
3332 | /* Perform direct synchronous page reclaim */ |
3333 | static int | |
a9263751 VB |
3334 | __perform_reclaim(gfp_t gfp_mask, unsigned int order, |
3335 | const struct alloc_context *ac) | |
11e33f6a | 3336 | { |
11e33f6a | 3337 | struct reclaim_state reclaim_state; |
bba90710 | 3338 | int progress; |
11e33f6a MG |
3339 | |
3340 | cond_resched(); | |
3341 | ||
3342 | /* We now go into synchronous reclaim */ | |
3343 | cpuset_memory_pressure_bump(); | |
c06b1fca | 3344 | current->flags |= PF_MEMALLOC; |
11e33f6a MG |
3345 | lockdep_set_current_reclaim_state(gfp_mask); |
3346 | reclaim_state.reclaimed_slab = 0; | |
c06b1fca | 3347 | current->reclaim_state = &reclaim_state; |
11e33f6a | 3348 | |
a9263751 VB |
3349 | progress = try_to_free_pages(ac->zonelist, order, gfp_mask, |
3350 | ac->nodemask); | |
11e33f6a | 3351 | |
c06b1fca | 3352 | current->reclaim_state = NULL; |
11e33f6a | 3353 | lockdep_clear_current_reclaim_state(); |
c06b1fca | 3354 | current->flags &= ~PF_MEMALLOC; |
11e33f6a MG |
3355 | |
3356 | cond_resched(); | |
3357 | ||
bba90710 MS |
3358 | return progress; |
3359 | } | |
3360 | ||
3361 | /* The really slow allocator path where we enter direct reclaim */ | |
3362 | static inline struct page * | |
3363 | __alloc_pages_direct_reclaim(gfp_t gfp_mask, unsigned int order, | |
c603844b | 3364 | unsigned int alloc_flags, const struct alloc_context *ac, |
a9263751 | 3365 | unsigned long *did_some_progress) |
bba90710 MS |
3366 | { |
3367 | struct page *page = NULL; | |
3368 | bool drained = false; | |
3369 | ||
a9263751 | 3370 | *did_some_progress = __perform_reclaim(gfp_mask, order, ac); |
9ee493ce MG |
3371 | if (unlikely(!(*did_some_progress))) |
3372 | return NULL; | |
11e33f6a | 3373 | |
9ee493ce | 3374 | retry: |
a9263751 VB |
3375 | page = get_page_from_freelist(gfp_mask, order, |
3376 | alloc_flags & ~ALLOC_NO_WATERMARKS, ac); | |
9ee493ce MG |
3377 | |
3378 | /* | |
3379 | * If an allocation failed after direct reclaim, it could be because | |
0aaa29a5 MG |
3380 | * pages are pinned on the per-cpu lists or in high alloc reserves. |
3381 | * Shrink them them and try again | |
9ee493ce MG |
3382 | */ |
3383 | if (!page && !drained) { | |
0aaa29a5 | 3384 | unreserve_highatomic_pageblock(ac); |
93481ff0 | 3385 | drain_all_pages(NULL); |
9ee493ce MG |
3386 | drained = true; |
3387 | goto retry; | |
3388 | } | |
3389 | ||
11e33f6a MG |
3390 | return page; |
3391 | } | |
3392 | ||
a9263751 | 3393 | static void wake_all_kswapds(unsigned int order, const struct alloc_context *ac) |
3a025760 JW |
3394 | { |
3395 | struct zoneref *z; | |
3396 | struct zone *zone; | |
3397 | ||
a9263751 VB |
3398 | for_each_zone_zonelist_nodemask(zone, z, ac->zonelist, |
3399 | ac->high_zoneidx, ac->nodemask) | |
93ea9964 | 3400 | wakeup_kswapd(zone, order, ac_classzone_idx(ac)); |
3a025760 JW |
3401 | } |
3402 | ||
c603844b | 3403 | static inline unsigned int |
341ce06f PZ |
3404 | gfp_to_alloc_flags(gfp_t gfp_mask) |
3405 | { | |
c603844b | 3406 | unsigned int alloc_flags = ALLOC_WMARK_MIN | ALLOC_CPUSET; |
1da177e4 | 3407 | |
a56f57ff | 3408 | /* __GFP_HIGH is assumed to be the same as ALLOC_HIGH to save a branch. */ |
e6223a3b | 3409 | BUILD_BUG_ON(__GFP_HIGH != (__force gfp_t) ALLOC_HIGH); |
933e312e | 3410 | |
341ce06f PZ |
3411 | /* |
3412 | * The caller may dip into page reserves a bit more if the caller | |
3413 | * cannot run direct reclaim, or if the caller has realtime scheduling | |
3414 | * policy or is asking for __GFP_HIGH memory. GFP_ATOMIC requests will | |
d0164adc | 3415 | * set both ALLOC_HARDER (__GFP_ATOMIC) and ALLOC_HIGH (__GFP_HIGH). |
341ce06f | 3416 | */ |
e6223a3b | 3417 | alloc_flags |= (__force int) (gfp_mask & __GFP_HIGH); |
1da177e4 | 3418 | |
d0164adc | 3419 | if (gfp_mask & __GFP_ATOMIC) { |
5c3240d9 | 3420 | /* |
b104a35d DR |
3421 | * Not worth trying to allocate harder for __GFP_NOMEMALLOC even |
3422 | * if it can't schedule. | |
5c3240d9 | 3423 | */ |
b104a35d | 3424 | if (!(gfp_mask & __GFP_NOMEMALLOC)) |
5c3240d9 | 3425 | alloc_flags |= ALLOC_HARDER; |
523b9458 | 3426 | /* |
b104a35d | 3427 | * Ignore cpuset mems for GFP_ATOMIC rather than fail, see the |
344736f2 | 3428 | * comment for __cpuset_node_allowed(). |
523b9458 | 3429 | */ |
341ce06f | 3430 | alloc_flags &= ~ALLOC_CPUSET; |
c06b1fca | 3431 | } else if (unlikely(rt_task(current)) && !in_interrupt()) |
341ce06f PZ |
3432 | alloc_flags |= ALLOC_HARDER; |
3433 | ||
b37f1dd0 MG |
3434 | if (likely(!(gfp_mask & __GFP_NOMEMALLOC))) { |
3435 | if (gfp_mask & __GFP_MEMALLOC) | |
3436 | alloc_flags |= ALLOC_NO_WATERMARKS; | |
907aed48 MG |
3437 | else if (in_serving_softirq() && (current->flags & PF_MEMALLOC)) |
3438 | alloc_flags |= ALLOC_NO_WATERMARKS; | |
3439 | else if (!in_interrupt() && | |
3440 | ((current->flags & PF_MEMALLOC) || | |
3441 | unlikely(test_thread_flag(TIF_MEMDIE)))) | |
341ce06f | 3442 | alloc_flags |= ALLOC_NO_WATERMARKS; |
1da177e4 | 3443 | } |
d95ea5d1 | 3444 | #ifdef CONFIG_CMA |
43e7a34d | 3445 | if (gfpflags_to_migratetype(gfp_mask) == MIGRATE_MOVABLE) |
d95ea5d1 BZ |
3446 | alloc_flags |= ALLOC_CMA; |
3447 | #endif | |
341ce06f PZ |
3448 | return alloc_flags; |
3449 | } | |
3450 | ||
072bb0aa MG |
3451 | bool gfp_pfmemalloc_allowed(gfp_t gfp_mask) |
3452 | { | |
b37f1dd0 | 3453 | return !!(gfp_to_alloc_flags(gfp_mask) & ALLOC_NO_WATERMARKS); |
072bb0aa MG |
3454 | } |
3455 | ||
d0164adc MG |
3456 | static inline bool is_thp_gfp_mask(gfp_t gfp_mask) |
3457 | { | |
3458 | return (gfp_mask & (GFP_TRANSHUGE | __GFP_KSWAPD_RECLAIM)) == GFP_TRANSHUGE; | |
3459 | } | |
3460 | ||
0a0337e0 MH |
3461 | /* |
3462 | * Maximum number of reclaim retries without any progress before OOM killer | |
3463 | * is consider as the only way to move forward. | |
3464 | */ | |
3465 | #define MAX_RECLAIM_RETRIES 16 | |
3466 | ||
3467 | /* | |
3468 | * Checks whether it makes sense to retry the reclaim to make a forward progress | |
3469 | * for the given allocation request. | |
3470 | * The reclaim feedback represented by did_some_progress (any progress during | |
7854ea6c MH |
3471 | * the last reclaim round) and no_progress_loops (number of reclaim rounds without |
3472 | * any progress in a row) is considered as well as the reclaimable pages on the | |
3473 | * applicable zone list (with a backoff mechanism which is a function of | |
3474 | * no_progress_loops). | |
0a0337e0 MH |
3475 | * |
3476 | * Returns true if a retry is viable or false to enter the oom path. | |
3477 | */ | |
3478 | static inline bool | |
3479 | should_reclaim_retry(gfp_t gfp_mask, unsigned order, | |
3480 | struct alloc_context *ac, int alloc_flags, | |
7854ea6c | 3481 | bool did_some_progress, int no_progress_loops) |
0a0337e0 MH |
3482 | { |
3483 | struct zone *zone; | |
3484 | struct zoneref *z; | |
3485 | ||
3486 | /* | |
3487 | * Make sure we converge to OOM if we cannot make any progress | |
3488 | * several times in the row. | |
3489 | */ | |
3490 | if (no_progress_loops > MAX_RECLAIM_RETRIES) | |
3491 | return false; | |
3492 | ||
0a0337e0 MH |
3493 | /* |
3494 | * Keep reclaiming pages while there is a chance this will lead somewhere. | |
3495 | * If none of the target zones can satisfy our allocation request even | |
3496 | * if all reclaimable pages are considered then we are screwed and have | |
3497 | * to go OOM. | |
3498 | */ | |
3499 | for_each_zone_zonelist_nodemask(zone, z, ac->zonelist, ac->high_zoneidx, | |
3500 | ac->nodemask) { | |
3501 | unsigned long available; | |
ede37713 | 3502 | unsigned long reclaimable; |
0a0337e0 | 3503 | |
ede37713 | 3504 | available = reclaimable = zone_reclaimable_pages(zone); |
0a0337e0 MH |
3505 | available -= DIV_ROUND_UP(no_progress_loops * available, |
3506 | MAX_RECLAIM_RETRIES); | |
3507 | available += zone_page_state_snapshot(zone, NR_FREE_PAGES); | |
3508 | ||
3509 | /* | |
3510 | * Would the allocation succeed if we reclaimed the whole | |
3511 | * available? | |
3512 | */ | |
3513 | if (__zone_watermark_ok(zone, order, min_wmark_pages(zone), | |
ede37713 MH |
3514 | ac_classzone_idx(ac), alloc_flags, available)) { |
3515 | /* | |
3516 | * If we didn't make any progress and have a lot of | |
3517 | * dirty + writeback pages then we should wait for | |
3518 | * an IO to complete to slow down the reclaim and | |
3519 | * prevent from pre mature OOM | |
3520 | */ | |
3521 | if (!did_some_progress) { | |
3522 | unsigned long writeback; | |
3523 | unsigned long dirty; | |
3524 | ||
3525 | writeback = zone_page_state_snapshot(zone, | |
3526 | NR_WRITEBACK); | |
3527 | dirty = zone_page_state_snapshot(zone, NR_FILE_DIRTY); | |
3528 | ||
3529 | if (2*(writeback + dirty) > reclaimable) { | |
3530 | congestion_wait(BLK_RW_ASYNC, HZ/10); | |
3531 | return true; | |
3532 | } | |
3533 | } | |
3534 | ||
3535 | /* | |
3536 | * Memory allocation/reclaim might be called from a WQ | |
3537 | * context and the current implementation of the WQ | |
3538 | * concurrency control doesn't recognize that | |
3539 | * a particular WQ is congested if the worker thread is | |
3540 | * looping without ever sleeping. Therefore we have to | |
3541 | * do a short sleep here rather than calling | |
3542 | * cond_resched(). | |
3543 | */ | |
3544 | if (current->flags & PF_WQ_WORKER) | |
3545 | schedule_timeout_uninterruptible(1); | |
3546 | else | |
3547 | cond_resched(); | |
3548 | ||
0a0337e0 MH |
3549 | return true; |
3550 | } | |
3551 | } | |
3552 | ||
3553 | return false; | |
3554 | } | |
3555 | ||
11e33f6a MG |
3556 | static inline struct page * |
3557 | __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order, | |
a9263751 | 3558 | struct alloc_context *ac) |
11e33f6a | 3559 | { |
d0164adc | 3560 | bool can_direct_reclaim = gfp_mask & __GFP_DIRECT_RECLAIM; |
11e33f6a | 3561 | struct page *page = NULL; |
c603844b | 3562 | unsigned int alloc_flags; |
11e33f6a | 3563 | unsigned long did_some_progress; |
e0b9daeb | 3564 | enum migrate_mode migration_mode = MIGRATE_ASYNC; |
c5d01d0d | 3565 | enum compact_result compact_result; |
33c2d214 | 3566 | int compaction_retries = 0; |
0a0337e0 | 3567 | int no_progress_loops = 0; |
1da177e4 | 3568 | |
72807a74 MG |
3569 | /* |
3570 | * In the slowpath, we sanity check order to avoid ever trying to | |
3571 | * reclaim >= MAX_ORDER areas which will never succeed. Callers may | |
3572 | * be using allocators in order of preference for an area that is | |
3573 | * too large. | |
3574 | */ | |
1fc28b70 MG |
3575 | if (order >= MAX_ORDER) { |
3576 | WARN_ON_ONCE(!(gfp_mask & __GFP_NOWARN)); | |
72807a74 | 3577 | return NULL; |
1fc28b70 | 3578 | } |
1da177e4 | 3579 | |
d0164adc MG |
3580 | /* |
3581 | * We also sanity check to catch abuse of atomic reserves being used by | |
3582 | * callers that are not in atomic context. | |
3583 | */ | |
3584 | if (WARN_ON_ONCE((gfp_mask & (__GFP_ATOMIC|__GFP_DIRECT_RECLAIM)) == | |
3585 | (__GFP_ATOMIC|__GFP_DIRECT_RECLAIM))) | |
3586 | gfp_mask &= ~__GFP_ATOMIC; | |
3587 | ||
9879de73 | 3588 | retry: |
d0164adc | 3589 | if (gfp_mask & __GFP_KSWAPD_RECLAIM) |
a9263751 | 3590 | wake_all_kswapds(order, ac); |
1da177e4 | 3591 | |
9bf2229f | 3592 | /* |
7fb1d9fc RS |
3593 | * OK, we're below the kswapd watermark and have kicked background |
3594 | * reclaim. Now things get more complex, so set up alloc_flags according | |
3595 | * to how we want to proceed. | |
9bf2229f | 3596 | */ |
341ce06f | 3597 | alloc_flags = gfp_to_alloc_flags(gfp_mask); |
1da177e4 | 3598 | |
341ce06f | 3599 | /* This is the last chance, in general, before the goto nopage. */ |
a9263751 VB |
3600 | page = get_page_from_freelist(gfp_mask, order, |
3601 | alloc_flags & ~ALLOC_NO_WATERMARKS, ac); | |
7fb1d9fc RS |
3602 | if (page) |
3603 | goto got_pg; | |
1da177e4 | 3604 | |
11e33f6a | 3605 | /* Allocate without watermarks if the context allows */ |
341ce06f | 3606 | if (alloc_flags & ALLOC_NO_WATERMARKS) { |
183f6371 MG |
3607 | /* |
3608 | * Ignore mempolicies if ALLOC_NO_WATERMARKS on the grounds | |
3609 | * the allocation is high priority and these type of | |
3610 | * allocations are system rather than user orientated | |
3611 | */ | |
a9263751 | 3612 | ac->zonelist = node_zonelist(numa_node_id(), gfp_mask); |
33d53103 MH |
3613 | page = get_page_from_freelist(gfp_mask, order, |
3614 | ALLOC_NO_WATERMARKS, ac); | |
3615 | if (page) | |
3616 | goto got_pg; | |
1da177e4 LT |
3617 | } |
3618 | ||
d0164adc MG |
3619 | /* Caller is not willing to reclaim, we can't balance anything */ |
3620 | if (!can_direct_reclaim) { | |
aed0a0e3 | 3621 | /* |
33d53103 MH |
3622 | * All existing users of the __GFP_NOFAIL are blockable, so warn |
3623 | * of any new users that actually allow this type of allocation | |
3624 | * to fail. | |
aed0a0e3 DR |
3625 | */ |
3626 | WARN_ON_ONCE(gfp_mask & __GFP_NOFAIL); | |
1da177e4 | 3627 | goto nopage; |
aed0a0e3 | 3628 | } |
1da177e4 | 3629 | |
341ce06f | 3630 | /* Avoid recursion of direct reclaim */ |
33d53103 MH |
3631 | if (current->flags & PF_MEMALLOC) { |
3632 | /* | |
3633 | * __GFP_NOFAIL request from this context is rather bizarre | |
3634 | * because we cannot reclaim anything and only can loop waiting | |
3635 | * for somebody to do a work for us. | |
3636 | */ | |
3637 | if (WARN_ON_ONCE(gfp_mask & __GFP_NOFAIL)) { | |
3638 | cond_resched(); | |
3639 | goto retry; | |
3640 | } | |
341ce06f | 3641 | goto nopage; |
33d53103 | 3642 | } |
341ce06f | 3643 | |
6583bb64 DR |
3644 | /* Avoid allocations with no watermarks from looping endlessly */ |
3645 | if (test_thread_flag(TIF_MEMDIE) && !(gfp_mask & __GFP_NOFAIL)) | |
3646 | goto nopage; | |
3647 | ||
77f1fe6b MG |
3648 | /* |
3649 | * Try direct compaction. The first pass is asynchronous. Subsequent | |
3650 | * attempts after direct reclaim are synchronous | |
3651 | */ | |
a9263751 VB |
3652 | page = __alloc_pages_direct_compact(gfp_mask, order, alloc_flags, ac, |
3653 | migration_mode, | |
c5d01d0d | 3654 | &compact_result); |
56de7263 MG |
3655 | if (page) |
3656 | goto got_pg; | |
75f30861 | 3657 | |
1f9efdef | 3658 | /* Checks for THP-specific high-order allocations */ |
d0164adc | 3659 | if (is_thp_gfp_mask(gfp_mask)) { |
1f9efdef VB |
3660 | /* |
3661 | * If compaction is deferred for high-order allocations, it is | |
3662 | * because sync compaction recently failed. If this is the case | |
3663 | * and the caller requested a THP allocation, we do not want | |
3664 | * to heavily disrupt the system, so we fail the allocation | |
3665 | * instead of entering direct reclaim. | |
3666 | */ | |
c5d01d0d | 3667 | if (compact_result == COMPACT_DEFERRED) |
1f9efdef VB |
3668 | goto nopage; |
3669 | ||
3670 | /* | |
c5d01d0d MH |
3671 | * Compaction is contended so rather back off than cause |
3672 | * excessive stalls. | |
1f9efdef | 3673 | */ |
c5d01d0d | 3674 | if(compact_result == COMPACT_CONTENDED) |
1f9efdef VB |
3675 | goto nopage; |
3676 | } | |
66199712 | 3677 | |
33c2d214 MH |
3678 | if (order && compaction_made_progress(compact_result)) |
3679 | compaction_retries++; | |
8fe78048 | 3680 | |
11e33f6a | 3681 | /* Try direct reclaim and then allocating */ |
a9263751 VB |
3682 | page = __alloc_pages_direct_reclaim(gfp_mask, order, alloc_flags, ac, |
3683 | &did_some_progress); | |
11e33f6a MG |
3684 | if (page) |
3685 | goto got_pg; | |
1da177e4 | 3686 | |
9083905a JW |
3687 | /* Do not loop if specifically requested */ |
3688 | if (gfp_mask & __GFP_NORETRY) | |
3689 | goto noretry; | |
3690 | ||
0a0337e0 MH |
3691 | /* |
3692 | * Do not retry costly high order allocations unless they are | |
3693 | * __GFP_REPEAT | |
3694 | */ | |
3695 | if (order > PAGE_ALLOC_COSTLY_ORDER && !(gfp_mask & __GFP_REPEAT)) | |
3696 | goto noretry; | |
3697 | ||
7854ea6c MH |
3698 | /* |
3699 | * Costly allocations might have made a progress but this doesn't mean | |
3700 | * their order will become available due to high fragmentation so | |
3701 | * always increment the no progress counter for them | |
3702 | */ | |
3703 | if (did_some_progress && order <= PAGE_ALLOC_COSTLY_ORDER) | |
0a0337e0 | 3704 | no_progress_loops = 0; |
7854ea6c | 3705 | else |
0a0337e0 | 3706 | no_progress_loops++; |
1da177e4 | 3707 | |
0a0337e0 | 3708 | if (should_reclaim_retry(gfp_mask, order, ac, alloc_flags, |
7854ea6c | 3709 | did_some_progress > 0, no_progress_loops)) |
0a0337e0 MH |
3710 | goto retry; |
3711 | ||
33c2d214 MH |
3712 | /* |
3713 | * It doesn't make any sense to retry for the compaction if the order-0 | |
3714 | * reclaim is not able to make any progress because the current | |
3715 | * implementation of the compaction depends on the sufficient amount | |
3716 | * of free memory (see __compaction_suitable) | |
3717 | */ | |
3718 | if (did_some_progress > 0 && | |
86a294a8 MH |
3719 | should_compact_retry(ac, order, alloc_flags, |
3720 | compact_result, &migration_mode, | |
3721 | compaction_retries)) | |
33c2d214 MH |
3722 | goto retry; |
3723 | ||
9083905a JW |
3724 | /* Reclaim has failed us, start killing things */ |
3725 | page = __alloc_pages_may_oom(gfp_mask, order, ac, &did_some_progress); | |
3726 | if (page) | |
3727 | goto got_pg; | |
3728 | ||
3729 | /* Retry as long as the OOM killer is making progress */ | |
0a0337e0 MH |
3730 | if (did_some_progress) { |
3731 | no_progress_loops = 0; | |
9083905a | 3732 | goto retry; |
0a0337e0 | 3733 | } |
9083905a JW |
3734 | |
3735 | noretry: | |
3736 | /* | |
33c2d214 MH |
3737 | * High-order allocations do not necessarily loop after direct reclaim |
3738 | * and reclaim/compaction depends on compaction being called after | |
3739 | * reclaim so call directly if necessary. | |
3740 | * It can become very expensive to allocate transparent hugepages at | |
3741 | * fault, so use asynchronous memory compaction for THP unless it is | |
3742 | * khugepaged trying to collapse. All other requests should tolerate | |
3743 | * at least light sync migration. | |
9083905a | 3744 | */ |
33c2d214 MH |
3745 | if (is_thp_gfp_mask(gfp_mask) && !(current->flags & PF_KTHREAD)) |
3746 | migration_mode = MIGRATE_ASYNC; | |
3747 | else | |
3748 | migration_mode = MIGRATE_SYNC_LIGHT; | |
9083905a JW |
3749 | page = __alloc_pages_direct_compact(gfp_mask, order, alloc_flags, |
3750 | ac, migration_mode, | |
c5d01d0d | 3751 | &compact_result); |
9083905a JW |
3752 | if (page) |
3753 | goto got_pg; | |
1da177e4 | 3754 | nopage: |
a238ab5b | 3755 | warn_alloc_failed(gfp_mask, order, NULL); |
1da177e4 | 3756 | got_pg: |
072bb0aa | 3757 | return page; |
1da177e4 | 3758 | } |
11e33f6a MG |
3759 | |
3760 | /* | |
3761 | * This is the 'heart' of the zoned buddy allocator. | |
3762 | */ | |
3763 | struct page * | |
3764 | __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order, | |
3765 | struct zonelist *zonelist, nodemask_t *nodemask) | |
3766 | { | |
5bb1b169 | 3767 | struct page *page; |
cc9a6c87 | 3768 | unsigned int cpuset_mems_cookie; |
c603844b | 3769 | unsigned int alloc_flags = ALLOC_WMARK_LOW|ALLOC_FAIR; |
83d4ca81 | 3770 | gfp_t alloc_mask = gfp_mask; /* The gfp_t that was actually used for allocation */ |
a9263751 VB |
3771 | struct alloc_context ac = { |
3772 | .high_zoneidx = gfp_zone(gfp_mask), | |
682a3385 | 3773 | .zonelist = zonelist, |
a9263751 VB |
3774 | .nodemask = nodemask, |
3775 | .migratetype = gfpflags_to_migratetype(gfp_mask), | |
3776 | }; | |
11e33f6a | 3777 | |
682a3385 | 3778 | if (cpusets_enabled()) { |
83d4ca81 | 3779 | alloc_mask |= __GFP_HARDWALL; |
682a3385 MG |
3780 | alloc_flags |= ALLOC_CPUSET; |
3781 | if (!ac.nodemask) | |
3782 | ac.nodemask = &cpuset_current_mems_allowed; | |
3783 | } | |
3784 | ||
dcce284a BH |
3785 | gfp_mask &= gfp_allowed_mask; |
3786 | ||
11e33f6a MG |
3787 | lockdep_trace_alloc(gfp_mask); |
3788 | ||
d0164adc | 3789 | might_sleep_if(gfp_mask & __GFP_DIRECT_RECLAIM); |
11e33f6a MG |
3790 | |
3791 | if (should_fail_alloc_page(gfp_mask, order)) | |
3792 | return NULL; | |
3793 | ||
3794 | /* | |
3795 | * Check the zones suitable for the gfp_mask contain at least one | |
3796 | * valid zone. It's possible to have an empty zonelist as a result | |
4167e9b2 | 3797 | * of __GFP_THISNODE and a memoryless node |
11e33f6a MG |
3798 | */ |
3799 | if (unlikely(!zonelist->_zonerefs->zone)) | |
3800 | return NULL; | |
3801 | ||
a9263751 | 3802 | if (IS_ENABLED(CONFIG_CMA) && ac.migratetype == MIGRATE_MOVABLE) |
21bb9bd1 VB |
3803 | alloc_flags |= ALLOC_CMA; |
3804 | ||
cc9a6c87 | 3805 | retry_cpuset: |
d26914d1 | 3806 | cpuset_mems_cookie = read_mems_allowed_begin(); |
cc9a6c87 | 3807 | |
c9ab0c4f MG |
3808 | /* Dirty zone balancing only done in the fast path */ |
3809 | ac.spread_dirty_pages = (gfp_mask & __GFP_WRITE); | |
3810 | ||
5117f45d | 3811 | /* The preferred zone is used for statistics later */ |
c33d6c06 MG |
3812 | ac.preferred_zoneref = first_zones_zonelist(ac.zonelist, |
3813 | ac.high_zoneidx, ac.nodemask); | |
3814 | if (!ac.preferred_zoneref) { | |
5bb1b169 | 3815 | page = NULL; |
4fcb0971 | 3816 | goto no_zone; |
5bb1b169 MG |
3817 | } |
3818 | ||
5117f45d | 3819 | /* First allocation attempt */ |
a9263751 | 3820 | page = get_page_from_freelist(alloc_mask, order, alloc_flags, &ac); |
4fcb0971 MG |
3821 | if (likely(page)) |
3822 | goto out; | |
11e33f6a | 3823 | |
4fcb0971 MG |
3824 | /* |
3825 | * Runtime PM, block IO and its error handling path can deadlock | |
3826 | * because I/O on the device might not complete. | |
3827 | */ | |
3828 | alloc_mask = memalloc_noio_flags(gfp_mask); | |
3829 | ac.spread_dirty_pages = false; | |
23f086f9 | 3830 | |
4741526b MG |
3831 | /* |
3832 | * Restore the original nodemask if it was potentially replaced with | |
3833 | * &cpuset_current_mems_allowed to optimize the fast-path attempt. | |
3834 | */ | |
3835 | if (cpusets_enabled()) | |
3836 | ac.nodemask = nodemask; | |
4fcb0971 | 3837 | page = __alloc_pages_slowpath(alloc_mask, order, &ac); |
cc9a6c87 | 3838 | |
4fcb0971 | 3839 | no_zone: |
cc9a6c87 MG |
3840 | /* |
3841 | * When updating a task's mems_allowed, it is possible to race with | |
3842 | * parallel threads in such a way that an allocation can fail while | |
3843 | * the mask is being updated. If a page allocation is about to fail, | |
3844 | * check if the cpuset changed during allocation and if so, retry. | |
3845 | */ | |
83d4ca81 MG |
3846 | if (unlikely(!page && read_mems_allowed_retry(cpuset_mems_cookie))) { |
3847 | alloc_mask = gfp_mask; | |
cc9a6c87 | 3848 | goto retry_cpuset; |
83d4ca81 | 3849 | } |
cc9a6c87 | 3850 | |
4fcb0971 MG |
3851 | out: |
3852 | if (kmemcheck_enabled && page) | |
3853 | kmemcheck_pagealloc_alloc(page, order, gfp_mask); | |
3854 | ||
3855 | trace_mm_page_alloc(page, order, alloc_mask, ac.migratetype); | |
3856 | ||
11e33f6a | 3857 | return page; |
1da177e4 | 3858 | } |
d239171e | 3859 | EXPORT_SYMBOL(__alloc_pages_nodemask); |
1da177e4 LT |
3860 | |
3861 | /* | |
3862 | * Common helper functions. | |
3863 | */ | |
920c7a5d | 3864 | unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order) |
1da177e4 | 3865 | { |
945a1113 AM |
3866 | struct page *page; |
3867 | ||
3868 | /* | |
3869 | * __get_free_pages() returns a 32-bit address, which cannot represent | |
3870 | * a highmem page | |
3871 | */ | |
3872 | VM_BUG_ON((gfp_mask & __GFP_HIGHMEM) != 0); | |
3873 | ||
1da177e4 LT |
3874 | page = alloc_pages(gfp_mask, order); |
3875 | if (!page) | |
3876 | return 0; | |
3877 | return (unsigned long) page_address(page); | |
3878 | } | |
1da177e4 LT |
3879 | EXPORT_SYMBOL(__get_free_pages); |
3880 | ||
920c7a5d | 3881 | unsigned long get_zeroed_page(gfp_t gfp_mask) |
1da177e4 | 3882 | { |
945a1113 | 3883 | return __get_free_pages(gfp_mask | __GFP_ZERO, 0); |
1da177e4 | 3884 | } |
1da177e4 LT |
3885 | EXPORT_SYMBOL(get_zeroed_page); |
3886 | ||
920c7a5d | 3887 | void __free_pages(struct page *page, unsigned int order) |
1da177e4 | 3888 | { |
b5810039 | 3889 | if (put_page_testzero(page)) { |
1da177e4 | 3890 | if (order == 0) |
b745bc85 | 3891 | free_hot_cold_page(page, false); |
1da177e4 LT |
3892 | else |
3893 | __free_pages_ok(page, order); | |
3894 | } | |
3895 | } | |
3896 | ||
3897 | EXPORT_SYMBOL(__free_pages); | |
3898 | ||
920c7a5d | 3899 | void free_pages(unsigned long addr, unsigned int order) |
1da177e4 LT |
3900 | { |
3901 | if (addr != 0) { | |
725d704e | 3902 | VM_BUG_ON(!virt_addr_valid((void *)addr)); |
1da177e4 LT |
3903 | __free_pages(virt_to_page((void *)addr), order); |
3904 | } | |
3905 | } | |
3906 | ||
3907 | EXPORT_SYMBOL(free_pages); | |
3908 | ||
b63ae8ca AD |
3909 | /* |
3910 | * Page Fragment: | |
3911 | * An arbitrary-length arbitrary-offset area of memory which resides | |
3912 | * within a 0 or higher order page. Multiple fragments within that page | |
3913 | * are individually refcounted, in the page's reference counter. | |
3914 | * | |
3915 | * The page_frag functions below provide a simple allocation framework for | |
3916 | * page fragments. This is used by the network stack and network device | |
3917 | * drivers to provide a backing region of memory for use as either an | |
3918 | * sk_buff->head, or to be used in the "frags" portion of skb_shared_info. | |
3919 | */ | |
3920 | static struct page *__page_frag_refill(struct page_frag_cache *nc, | |
3921 | gfp_t gfp_mask) | |
3922 | { | |
3923 | struct page *page = NULL; | |
3924 | gfp_t gfp = gfp_mask; | |
3925 | ||
3926 | #if (PAGE_SIZE < PAGE_FRAG_CACHE_MAX_SIZE) | |
3927 | gfp_mask |= __GFP_COMP | __GFP_NOWARN | __GFP_NORETRY | | |
3928 | __GFP_NOMEMALLOC; | |
3929 | page = alloc_pages_node(NUMA_NO_NODE, gfp_mask, | |
3930 | PAGE_FRAG_CACHE_MAX_ORDER); | |
3931 | nc->size = page ? PAGE_FRAG_CACHE_MAX_SIZE : PAGE_SIZE; | |
3932 | #endif | |
3933 | if (unlikely(!page)) | |
3934 | page = alloc_pages_node(NUMA_NO_NODE, gfp, 0); | |
3935 | ||
3936 | nc->va = page ? page_address(page) : NULL; | |
3937 | ||
3938 | return page; | |
3939 | } | |
3940 | ||
3941 | void *__alloc_page_frag(struct page_frag_cache *nc, | |
3942 | unsigned int fragsz, gfp_t gfp_mask) | |
3943 | { | |
3944 | unsigned int size = PAGE_SIZE; | |
3945 | struct page *page; | |
3946 | int offset; | |
3947 | ||
3948 | if (unlikely(!nc->va)) { | |
3949 | refill: | |
3950 | page = __page_frag_refill(nc, gfp_mask); | |
3951 | if (!page) | |
3952 | return NULL; | |
3953 | ||
3954 | #if (PAGE_SIZE < PAGE_FRAG_CACHE_MAX_SIZE) | |
3955 | /* if size can vary use size else just use PAGE_SIZE */ | |
3956 | size = nc->size; | |
3957 | #endif | |
3958 | /* Even if we own the page, we do not use atomic_set(). | |
3959 | * This would break get_page_unless_zero() users. | |
3960 | */ | |
fe896d18 | 3961 | page_ref_add(page, size - 1); |
b63ae8ca AD |
3962 | |
3963 | /* reset page count bias and offset to start of new frag */ | |
2f064f34 | 3964 | nc->pfmemalloc = page_is_pfmemalloc(page); |
b63ae8ca AD |
3965 | nc->pagecnt_bias = size; |
3966 | nc->offset = size; | |
3967 | } | |
3968 | ||
3969 | offset = nc->offset - fragsz; | |
3970 | if (unlikely(offset < 0)) { | |
3971 | page = virt_to_page(nc->va); | |
3972 | ||
fe896d18 | 3973 | if (!page_ref_sub_and_test(page, nc->pagecnt_bias)) |
b63ae8ca AD |
3974 | goto refill; |
3975 | ||
3976 | #if (PAGE_SIZE < PAGE_FRAG_CACHE_MAX_SIZE) | |
3977 | /* if size can vary use size else just use PAGE_SIZE */ | |
3978 | size = nc->size; | |
3979 | #endif | |
3980 | /* OK, page count is 0, we can safely set it */ | |
fe896d18 | 3981 | set_page_count(page, size); |
b63ae8ca AD |
3982 | |
3983 | /* reset page count bias and offset to start of new frag */ | |
3984 | nc->pagecnt_bias = size; | |
3985 | offset = size - fragsz; | |
3986 | } | |
3987 | ||
3988 | nc->pagecnt_bias--; | |
3989 | nc->offset = offset; | |
3990 | ||
3991 | return nc->va + offset; | |
3992 | } | |
3993 | EXPORT_SYMBOL(__alloc_page_frag); | |
3994 | ||
3995 | /* | |
3996 | * Frees a page fragment allocated out of either a compound or order 0 page. | |
3997 | */ | |
3998 | void __free_page_frag(void *addr) | |
3999 | { | |
4000 | struct page *page = virt_to_head_page(addr); | |
4001 | ||
4002 | if (unlikely(put_page_testzero(page))) | |
4003 | __free_pages_ok(page, compound_order(page)); | |
4004 | } | |
4005 | EXPORT_SYMBOL(__free_page_frag); | |
4006 | ||
6a1a0d3b | 4007 | /* |
52383431 | 4008 | * alloc_kmem_pages charges newly allocated pages to the kmem resource counter |
a9bb7e62 VD |
4009 | * of the current memory cgroup if __GFP_ACCOUNT is set, other than that it is |
4010 | * equivalent to alloc_pages. | |
6a1a0d3b | 4011 | * |
52383431 VD |
4012 | * It should be used when the caller would like to use kmalloc, but since the |
4013 | * allocation is large, it has to fall back to the page allocator. | |
4014 | */ | |
4015 | struct page *alloc_kmem_pages(gfp_t gfp_mask, unsigned int order) | |
4016 | { | |
4017 | struct page *page; | |
52383431 | 4018 | |
52383431 | 4019 | page = alloc_pages(gfp_mask, order); |
d05e83a6 VD |
4020 | if (page && memcg_kmem_charge(page, gfp_mask, order) != 0) { |
4021 | __free_pages(page, order); | |
4022 | page = NULL; | |
4023 | } | |
52383431 VD |
4024 | return page; |
4025 | } | |
4026 | ||
4027 | struct page *alloc_kmem_pages_node(int nid, gfp_t gfp_mask, unsigned int order) | |
4028 | { | |
4029 | struct page *page; | |
52383431 | 4030 | |
52383431 | 4031 | page = alloc_pages_node(nid, gfp_mask, order); |
d05e83a6 VD |
4032 | if (page && memcg_kmem_charge(page, gfp_mask, order) != 0) { |
4033 | __free_pages(page, order); | |
4034 | page = NULL; | |
4035 | } | |
52383431 VD |
4036 | return page; |
4037 | } | |
4038 | ||
4039 | /* | |
4040 | * __free_kmem_pages and free_kmem_pages will free pages allocated with | |
4041 | * alloc_kmem_pages. | |
6a1a0d3b | 4042 | */ |
52383431 | 4043 | void __free_kmem_pages(struct page *page, unsigned int order) |
6a1a0d3b | 4044 | { |
d05e83a6 | 4045 | memcg_kmem_uncharge(page, order); |
6a1a0d3b GC |
4046 | __free_pages(page, order); |
4047 | } | |
4048 | ||
52383431 | 4049 | void free_kmem_pages(unsigned long addr, unsigned int order) |
6a1a0d3b GC |
4050 | { |
4051 | if (addr != 0) { | |
4052 | VM_BUG_ON(!virt_addr_valid((void *)addr)); | |
52383431 | 4053 | __free_kmem_pages(virt_to_page((void *)addr), order); |
6a1a0d3b GC |
4054 | } |
4055 | } | |
4056 | ||
d00181b9 KS |
4057 | static void *make_alloc_exact(unsigned long addr, unsigned int order, |
4058 | size_t size) | |
ee85c2e1 AK |
4059 | { |
4060 | if (addr) { | |
4061 | unsigned long alloc_end = addr + (PAGE_SIZE << order); | |
4062 | unsigned long used = addr + PAGE_ALIGN(size); | |
4063 | ||
4064 | split_page(virt_to_page((void *)addr), order); | |
4065 | while (used < alloc_end) { | |
4066 | free_page(used); | |
4067 | used += PAGE_SIZE; | |
4068 | } | |
4069 | } | |
4070 | return (void *)addr; | |
4071 | } | |
4072 | ||
2be0ffe2 TT |
4073 | /** |
4074 | * alloc_pages_exact - allocate an exact number physically-contiguous pages. | |
4075 | * @size: the number of bytes to allocate | |
4076 | * @gfp_mask: GFP flags for the allocation | |
4077 | * | |
4078 | * This function is similar to alloc_pages(), except that it allocates the | |
4079 | * minimum number of pages to satisfy the request. alloc_pages() can only | |
4080 | * allocate memory in power-of-two pages. | |
4081 | * | |
4082 | * This function is also limited by MAX_ORDER. | |
4083 | * | |
4084 | * Memory allocated by this function must be released by free_pages_exact(). | |
4085 | */ | |
4086 | void *alloc_pages_exact(size_t size, gfp_t gfp_mask) | |
4087 | { | |
4088 | unsigned int order = get_order(size); | |
4089 | unsigned long addr; | |
4090 | ||
4091 | addr = __get_free_pages(gfp_mask, order); | |
ee85c2e1 | 4092 | return make_alloc_exact(addr, order, size); |
2be0ffe2 TT |
4093 | } |
4094 | EXPORT_SYMBOL(alloc_pages_exact); | |
4095 | ||
ee85c2e1 AK |
4096 | /** |
4097 | * alloc_pages_exact_nid - allocate an exact number of physically-contiguous | |
4098 | * pages on a node. | |
b5e6ab58 | 4099 | * @nid: the preferred node ID where memory should be allocated |
ee85c2e1 AK |
4100 | * @size: the number of bytes to allocate |
4101 | * @gfp_mask: GFP flags for the allocation | |
4102 | * | |
4103 | * Like alloc_pages_exact(), but try to allocate on node nid first before falling | |
4104 | * back. | |
ee85c2e1 | 4105 | */ |
e1931811 | 4106 | void * __meminit alloc_pages_exact_nid(int nid, size_t size, gfp_t gfp_mask) |
ee85c2e1 | 4107 | { |
d00181b9 | 4108 | unsigned int order = get_order(size); |
ee85c2e1 AK |
4109 | struct page *p = alloc_pages_node(nid, gfp_mask, order); |
4110 | if (!p) | |
4111 | return NULL; | |
4112 | return make_alloc_exact((unsigned long)page_address(p), order, size); | |
4113 | } | |
ee85c2e1 | 4114 | |
2be0ffe2 TT |
4115 | /** |
4116 | * free_pages_exact - release memory allocated via alloc_pages_exact() | |
4117 | * @virt: the value returned by alloc_pages_exact. | |
4118 | * @size: size of allocation, same value as passed to alloc_pages_exact(). | |
4119 | * | |
4120 | * Release the memory allocated by a previous call to alloc_pages_exact. | |
4121 | */ | |
4122 | void free_pages_exact(void *virt, size_t size) | |
4123 | { | |
4124 | unsigned long addr = (unsigned long)virt; | |
4125 | unsigned long end = addr + PAGE_ALIGN(size); | |
4126 | ||
4127 | while (addr < end) { | |
4128 | free_page(addr); | |
4129 | addr += PAGE_SIZE; | |
4130 | } | |
4131 | } | |
4132 | EXPORT_SYMBOL(free_pages_exact); | |
4133 | ||
e0fb5815 ZY |
4134 | /** |
4135 | * nr_free_zone_pages - count number of pages beyond high watermark | |
4136 | * @offset: The zone index of the highest zone | |
4137 | * | |
4138 | * nr_free_zone_pages() counts the number of counts pages which are beyond the | |
4139 | * high watermark within all zones at or below a given zone index. For each | |
4140 | * zone, the number of pages is calculated as: | |
834405c3 | 4141 | * managed_pages - high_pages |
e0fb5815 | 4142 | */ |
ebec3862 | 4143 | static unsigned long nr_free_zone_pages(int offset) |
1da177e4 | 4144 | { |
dd1a239f | 4145 | struct zoneref *z; |
54a6eb5c MG |
4146 | struct zone *zone; |
4147 | ||
e310fd43 | 4148 | /* Just pick one node, since fallback list is circular */ |
ebec3862 | 4149 | unsigned long sum = 0; |
1da177e4 | 4150 | |
0e88460d | 4151 | struct zonelist *zonelist = node_zonelist(numa_node_id(), GFP_KERNEL); |
1da177e4 | 4152 | |
54a6eb5c | 4153 | for_each_zone_zonelist(zone, z, zonelist, offset) { |
b40da049 | 4154 | unsigned long size = zone->managed_pages; |
41858966 | 4155 | unsigned long high = high_wmark_pages(zone); |
e310fd43 MB |
4156 | if (size > high) |
4157 | sum += size - high; | |
1da177e4 LT |
4158 | } |
4159 | ||
4160 | return sum; | |
4161 | } | |
4162 | ||
e0fb5815 ZY |
4163 | /** |
4164 | * nr_free_buffer_pages - count number of pages beyond high watermark | |
4165 | * | |
4166 | * nr_free_buffer_pages() counts the number of pages which are beyond the high | |
4167 | * watermark within ZONE_DMA and ZONE_NORMAL. | |
1da177e4 | 4168 | */ |
ebec3862 | 4169 | unsigned long nr_free_buffer_pages(void) |
1da177e4 | 4170 | { |
af4ca457 | 4171 | return nr_free_zone_pages(gfp_zone(GFP_USER)); |
1da177e4 | 4172 | } |
c2f1a551 | 4173 | EXPORT_SYMBOL_GPL(nr_free_buffer_pages); |
1da177e4 | 4174 | |
e0fb5815 ZY |
4175 | /** |
4176 | * nr_free_pagecache_pages - count number of pages beyond high watermark | |
4177 | * | |
4178 | * nr_free_pagecache_pages() counts the number of pages which are beyond the | |
4179 | * high watermark within all zones. | |
1da177e4 | 4180 | */ |
ebec3862 | 4181 | unsigned long nr_free_pagecache_pages(void) |
1da177e4 | 4182 | { |
2a1e274a | 4183 | return nr_free_zone_pages(gfp_zone(GFP_HIGHUSER_MOVABLE)); |
1da177e4 | 4184 | } |
08e0f6a9 CL |
4185 | |
4186 | static inline void show_node(struct zone *zone) | |
1da177e4 | 4187 | { |
e5adfffc | 4188 | if (IS_ENABLED(CONFIG_NUMA)) |
25ba77c1 | 4189 | printk("Node %d ", zone_to_nid(zone)); |
1da177e4 | 4190 | } |
1da177e4 | 4191 | |
d02bd27b IR |
4192 | long si_mem_available(void) |
4193 | { | |
4194 | long available; | |
4195 | unsigned long pagecache; | |
4196 | unsigned long wmark_low = 0; | |
4197 | unsigned long pages[NR_LRU_LISTS]; | |
4198 | struct zone *zone; | |
4199 | int lru; | |
4200 | ||
4201 | for (lru = LRU_BASE; lru < NR_LRU_LISTS; lru++) | |
4202 | pages[lru] = global_page_state(NR_LRU_BASE + lru); | |
4203 | ||
4204 | for_each_zone(zone) | |
4205 | wmark_low += zone->watermark[WMARK_LOW]; | |
4206 | ||
4207 | /* | |
4208 | * Estimate the amount of memory available for userspace allocations, | |
4209 | * without causing swapping. | |
4210 | */ | |
4211 | available = global_page_state(NR_FREE_PAGES) - totalreserve_pages; | |
4212 | ||
4213 | /* | |
4214 | * Not all the page cache can be freed, otherwise the system will | |
4215 | * start swapping. Assume at least half of the page cache, or the | |
4216 | * low watermark worth of cache, needs to stay. | |
4217 | */ | |
4218 | pagecache = pages[LRU_ACTIVE_FILE] + pages[LRU_INACTIVE_FILE]; | |
4219 | pagecache -= min(pagecache / 2, wmark_low); | |
4220 | available += pagecache; | |
4221 | ||
4222 | /* | |
4223 | * Part of the reclaimable slab consists of items that are in use, | |
4224 | * and cannot be freed. Cap this estimate at the low watermark. | |
4225 | */ | |
4226 | available += global_page_state(NR_SLAB_RECLAIMABLE) - | |
4227 | min(global_page_state(NR_SLAB_RECLAIMABLE) / 2, wmark_low); | |
4228 | ||
4229 | if (available < 0) | |
4230 | available = 0; | |
4231 | return available; | |
4232 | } | |
4233 | EXPORT_SYMBOL_GPL(si_mem_available); | |
4234 | ||
1da177e4 LT |
4235 | void si_meminfo(struct sysinfo *val) |
4236 | { | |
4237 | val->totalram = totalram_pages; | |
cc7452b6 | 4238 | val->sharedram = global_page_state(NR_SHMEM); |
d23ad423 | 4239 | val->freeram = global_page_state(NR_FREE_PAGES); |
1da177e4 | 4240 | val->bufferram = nr_blockdev_pages(); |
1da177e4 LT |
4241 | val->totalhigh = totalhigh_pages; |
4242 | val->freehigh = nr_free_highpages(); | |
1da177e4 LT |
4243 | val->mem_unit = PAGE_SIZE; |
4244 | } | |
4245 | ||
4246 | EXPORT_SYMBOL(si_meminfo); | |
4247 | ||
4248 | #ifdef CONFIG_NUMA | |
4249 | void si_meminfo_node(struct sysinfo *val, int nid) | |
4250 | { | |
cdd91a77 JL |
4251 | int zone_type; /* needs to be signed */ |
4252 | unsigned long managed_pages = 0; | |
fc2bd799 JK |
4253 | unsigned long managed_highpages = 0; |
4254 | unsigned long free_highpages = 0; | |
1da177e4 LT |
4255 | pg_data_t *pgdat = NODE_DATA(nid); |
4256 | ||
cdd91a77 JL |
4257 | for (zone_type = 0; zone_type < MAX_NR_ZONES; zone_type++) |
4258 | managed_pages += pgdat->node_zones[zone_type].managed_pages; | |
4259 | val->totalram = managed_pages; | |
cc7452b6 | 4260 | val->sharedram = node_page_state(nid, NR_SHMEM); |
d23ad423 | 4261 | val->freeram = node_page_state(nid, NR_FREE_PAGES); |
98d2b0eb | 4262 | #ifdef CONFIG_HIGHMEM |
fc2bd799 JK |
4263 | for (zone_type = 0; zone_type < MAX_NR_ZONES; zone_type++) { |
4264 | struct zone *zone = &pgdat->node_zones[zone_type]; | |
4265 | ||
4266 | if (is_highmem(zone)) { | |
4267 | managed_highpages += zone->managed_pages; | |
4268 | free_highpages += zone_page_state(zone, NR_FREE_PAGES); | |
4269 | } | |
4270 | } | |
4271 | val->totalhigh = managed_highpages; | |
4272 | val->freehigh = free_highpages; | |
98d2b0eb | 4273 | #else |
fc2bd799 JK |
4274 | val->totalhigh = managed_highpages; |
4275 | val->freehigh = free_highpages; | |
98d2b0eb | 4276 | #endif |
1da177e4 LT |
4277 | val->mem_unit = PAGE_SIZE; |
4278 | } | |
4279 | #endif | |
4280 | ||
ddd588b5 | 4281 | /* |
7bf02ea2 DR |
4282 | * Determine whether the node should be displayed or not, depending on whether |
4283 | * SHOW_MEM_FILTER_NODES was passed to show_free_areas(). | |
ddd588b5 | 4284 | */ |
7bf02ea2 | 4285 | bool skip_free_areas_node(unsigned int flags, int nid) |
ddd588b5 DR |
4286 | { |
4287 | bool ret = false; | |
cc9a6c87 | 4288 | unsigned int cpuset_mems_cookie; |
ddd588b5 DR |
4289 | |
4290 | if (!(flags & SHOW_MEM_FILTER_NODES)) | |
4291 | goto out; | |
4292 | ||
cc9a6c87 | 4293 | do { |
d26914d1 | 4294 | cpuset_mems_cookie = read_mems_allowed_begin(); |
cc9a6c87 | 4295 | ret = !node_isset(nid, cpuset_current_mems_allowed); |
d26914d1 | 4296 | } while (read_mems_allowed_retry(cpuset_mems_cookie)); |
ddd588b5 DR |
4297 | out: |
4298 | return ret; | |
4299 | } | |
4300 | ||
1da177e4 LT |
4301 | #define K(x) ((x) << (PAGE_SHIFT-10)) |
4302 | ||
377e4f16 RV |
4303 | static void show_migration_types(unsigned char type) |
4304 | { | |
4305 | static const char types[MIGRATE_TYPES] = { | |
4306 | [MIGRATE_UNMOVABLE] = 'U', | |
377e4f16 | 4307 | [MIGRATE_MOVABLE] = 'M', |
475a2f90 VB |
4308 | [MIGRATE_RECLAIMABLE] = 'E', |
4309 | [MIGRATE_HIGHATOMIC] = 'H', | |
377e4f16 RV |
4310 | #ifdef CONFIG_CMA |
4311 | [MIGRATE_CMA] = 'C', | |
4312 | #endif | |
194159fb | 4313 | #ifdef CONFIG_MEMORY_ISOLATION |
377e4f16 | 4314 | [MIGRATE_ISOLATE] = 'I', |
194159fb | 4315 | #endif |
377e4f16 RV |
4316 | }; |
4317 | char tmp[MIGRATE_TYPES + 1]; | |
4318 | char *p = tmp; | |
4319 | int i; | |
4320 | ||
4321 | for (i = 0; i < MIGRATE_TYPES; i++) { | |
4322 | if (type & (1 << i)) | |
4323 | *p++ = types[i]; | |
4324 | } | |
4325 | ||
4326 | *p = '\0'; | |
4327 | printk("(%s) ", tmp); | |
4328 | } | |
4329 | ||
1da177e4 LT |
4330 | /* |
4331 | * Show free area list (used inside shift_scroll-lock stuff) | |
4332 | * We also calculate the percentage fragmentation. We do this by counting the | |
4333 | * memory on each free list with the exception of the first item on the list. | |
d1bfcdb8 KK |
4334 | * |
4335 | * Bits in @filter: | |
4336 | * SHOW_MEM_FILTER_NODES: suppress nodes that are not allowed by current's | |
4337 | * cpuset. | |
1da177e4 | 4338 | */ |
7bf02ea2 | 4339 | void show_free_areas(unsigned int filter) |
1da177e4 | 4340 | { |
d1bfcdb8 | 4341 | unsigned long free_pcp = 0; |
c7241913 | 4342 | int cpu; |
1da177e4 LT |
4343 | struct zone *zone; |
4344 | ||
ee99c71c | 4345 | for_each_populated_zone(zone) { |
7bf02ea2 | 4346 | if (skip_free_areas_node(filter, zone_to_nid(zone))) |
ddd588b5 | 4347 | continue; |
d1bfcdb8 | 4348 | |
761b0677 KK |
4349 | for_each_online_cpu(cpu) |
4350 | free_pcp += per_cpu_ptr(zone->pageset, cpu)->pcp.count; | |
1da177e4 LT |
4351 | } |
4352 | ||
a731286d KM |
4353 | printk("active_anon:%lu inactive_anon:%lu isolated_anon:%lu\n" |
4354 | " active_file:%lu inactive_file:%lu isolated_file:%lu\n" | |
d1bfcdb8 KK |
4355 | " unevictable:%lu dirty:%lu writeback:%lu unstable:%lu\n" |
4356 | " slab_reclaimable:%lu slab_unreclaimable:%lu\n" | |
d1ce749a | 4357 | " mapped:%lu shmem:%lu pagetables:%lu bounce:%lu\n" |
d1bfcdb8 | 4358 | " free:%lu free_pcp:%lu free_cma:%lu\n", |
4f98a2fe | 4359 | global_page_state(NR_ACTIVE_ANON), |
4f98a2fe | 4360 | global_page_state(NR_INACTIVE_ANON), |
a731286d KM |
4361 | global_page_state(NR_ISOLATED_ANON), |
4362 | global_page_state(NR_ACTIVE_FILE), | |
4f98a2fe | 4363 | global_page_state(NR_INACTIVE_FILE), |
a731286d | 4364 | global_page_state(NR_ISOLATED_FILE), |
7b854121 | 4365 | global_page_state(NR_UNEVICTABLE), |
b1e7a8fd | 4366 | global_page_state(NR_FILE_DIRTY), |
ce866b34 | 4367 | global_page_state(NR_WRITEBACK), |
fd39fc85 | 4368 | global_page_state(NR_UNSTABLE_NFS), |
3701b033 KM |
4369 | global_page_state(NR_SLAB_RECLAIMABLE), |
4370 | global_page_state(NR_SLAB_UNRECLAIMABLE), | |
65ba55f5 | 4371 | global_page_state(NR_FILE_MAPPED), |
4b02108a | 4372 | global_page_state(NR_SHMEM), |
a25700a5 | 4373 | global_page_state(NR_PAGETABLE), |
d1ce749a | 4374 | global_page_state(NR_BOUNCE), |
d1bfcdb8 KK |
4375 | global_page_state(NR_FREE_PAGES), |
4376 | free_pcp, | |
d1ce749a | 4377 | global_page_state(NR_FREE_CMA_PAGES)); |
1da177e4 | 4378 | |
ee99c71c | 4379 | for_each_populated_zone(zone) { |
1da177e4 LT |
4380 | int i; |
4381 | ||
7bf02ea2 | 4382 | if (skip_free_areas_node(filter, zone_to_nid(zone))) |
ddd588b5 | 4383 | continue; |
d1bfcdb8 KK |
4384 | |
4385 | free_pcp = 0; | |
4386 | for_each_online_cpu(cpu) | |
4387 | free_pcp += per_cpu_ptr(zone->pageset, cpu)->pcp.count; | |
4388 | ||
1da177e4 LT |
4389 | show_node(zone); |
4390 | printk("%s" | |
4391 | " free:%lukB" | |
4392 | " min:%lukB" | |
4393 | " low:%lukB" | |
4394 | " high:%lukB" | |
4f98a2fe RR |
4395 | " active_anon:%lukB" |
4396 | " inactive_anon:%lukB" | |
4397 | " active_file:%lukB" | |
4398 | " inactive_file:%lukB" | |
7b854121 | 4399 | " unevictable:%lukB" |
a731286d KM |
4400 | " isolated(anon):%lukB" |
4401 | " isolated(file):%lukB" | |
1da177e4 | 4402 | " present:%lukB" |
9feedc9d | 4403 | " managed:%lukB" |
4a0aa73f KM |
4404 | " mlocked:%lukB" |
4405 | " dirty:%lukB" | |
4406 | " writeback:%lukB" | |
4407 | " mapped:%lukB" | |
4b02108a | 4408 | " shmem:%lukB" |
4a0aa73f KM |
4409 | " slab_reclaimable:%lukB" |
4410 | " slab_unreclaimable:%lukB" | |
c6a7f572 | 4411 | " kernel_stack:%lukB" |
4a0aa73f KM |
4412 | " pagetables:%lukB" |
4413 | " unstable:%lukB" | |
4414 | " bounce:%lukB" | |
d1bfcdb8 KK |
4415 | " free_pcp:%lukB" |
4416 | " local_pcp:%ukB" | |
d1ce749a | 4417 | " free_cma:%lukB" |
4a0aa73f | 4418 | " writeback_tmp:%lukB" |
1da177e4 LT |
4419 | " pages_scanned:%lu" |
4420 | " all_unreclaimable? %s" | |
4421 | "\n", | |
4422 | zone->name, | |
88f5acf8 | 4423 | K(zone_page_state(zone, NR_FREE_PAGES)), |
41858966 MG |
4424 | K(min_wmark_pages(zone)), |
4425 | K(low_wmark_pages(zone)), | |
4426 | K(high_wmark_pages(zone)), | |
4f98a2fe RR |
4427 | K(zone_page_state(zone, NR_ACTIVE_ANON)), |
4428 | K(zone_page_state(zone, NR_INACTIVE_ANON)), | |
4429 | K(zone_page_state(zone, NR_ACTIVE_FILE)), | |
4430 | K(zone_page_state(zone, NR_INACTIVE_FILE)), | |
7b854121 | 4431 | K(zone_page_state(zone, NR_UNEVICTABLE)), |
a731286d KM |
4432 | K(zone_page_state(zone, NR_ISOLATED_ANON)), |
4433 | K(zone_page_state(zone, NR_ISOLATED_FILE)), | |
1da177e4 | 4434 | K(zone->present_pages), |
9feedc9d | 4435 | K(zone->managed_pages), |
4a0aa73f KM |
4436 | K(zone_page_state(zone, NR_MLOCK)), |
4437 | K(zone_page_state(zone, NR_FILE_DIRTY)), | |
4438 | K(zone_page_state(zone, NR_WRITEBACK)), | |
4439 | K(zone_page_state(zone, NR_FILE_MAPPED)), | |
4b02108a | 4440 | K(zone_page_state(zone, NR_SHMEM)), |
4a0aa73f KM |
4441 | K(zone_page_state(zone, NR_SLAB_RECLAIMABLE)), |
4442 | K(zone_page_state(zone, NR_SLAB_UNRECLAIMABLE)), | |
c6a7f572 KM |
4443 | zone_page_state(zone, NR_KERNEL_STACK) * |
4444 | THREAD_SIZE / 1024, | |
4a0aa73f KM |
4445 | K(zone_page_state(zone, NR_PAGETABLE)), |
4446 | K(zone_page_state(zone, NR_UNSTABLE_NFS)), | |
4447 | K(zone_page_state(zone, NR_BOUNCE)), | |
d1bfcdb8 KK |
4448 | K(free_pcp), |
4449 | K(this_cpu_read(zone->pageset->pcp.count)), | |
d1ce749a | 4450 | K(zone_page_state(zone, NR_FREE_CMA_PAGES)), |
4a0aa73f | 4451 | K(zone_page_state(zone, NR_WRITEBACK_TEMP)), |
0d5d823a | 4452 | K(zone_page_state(zone, NR_PAGES_SCANNED)), |
6e543d57 | 4453 | (!zone_reclaimable(zone) ? "yes" : "no") |
1da177e4 LT |
4454 | ); |
4455 | printk("lowmem_reserve[]:"); | |
4456 | for (i = 0; i < MAX_NR_ZONES; i++) | |
3484b2de | 4457 | printk(" %ld", zone->lowmem_reserve[i]); |
1da177e4 LT |
4458 | printk("\n"); |
4459 | } | |
4460 | ||
ee99c71c | 4461 | for_each_populated_zone(zone) { |
d00181b9 KS |
4462 | unsigned int order; |
4463 | unsigned long nr[MAX_ORDER], flags, total = 0; | |
377e4f16 | 4464 | unsigned char types[MAX_ORDER]; |
1da177e4 | 4465 | |
7bf02ea2 | 4466 | if (skip_free_areas_node(filter, zone_to_nid(zone))) |
ddd588b5 | 4467 | continue; |
1da177e4 LT |
4468 | show_node(zone); |
4469 | printk("%s: ", zone->name); | |
1da177e4 LT |
4470 | |
4471 | spin_lock_irqsave(&zone->lock, flags); | |
4472 | for (order = 0; order < MAX_ORDER; order++) { | |
377e4f16 RV |
4473 | struct free_area *area = &zone->free_area[order]; |
4474 | int type; | |
4475 | ||
4476 | nr[order] = area->nr_free; | |
8f9de51a | 4477 | total += nr[order] << order; |
377e4f16 RV |
4478 | |
4479 | types[order] = 0; | |
4480 | for (type = 0; type < MIGRATE_TYPES; type++) { | |
4481 | if (!list_empty(&area->free_list[type])) | |
4482 | types[order] |= 1 << type; | |
4483 | } | |
1da177e4 LT |
4484 | } |
4485 | spin_unlock_irqrestore(&zone->lock, flags); | |
377e4f16 | 4486 | for (order = 0; order < MAX_ORDER; order++) { |
8f9de51a | 4487 | printk("%lu*%lukB ", nr[order], K(1UL) << order); |
377e4f16 RV |
4488 | if (nr[order]) |
4489 | show_migration_types(types[order]); | |
4490 | } | |
1da177e4 LT |
4491 | printk("= %lukB\n", K(total)); |
4492 | } | |
4493 | ||
949f7ec5 DR |
4494 | hugetlb_show_meminfo(); |
4495 | ||
e6f3602d LW |
4496 | printk("%ld total pagecache pages\n", global_page_state(NR_FILE_PAGES)); |
4497 | ||
1da177e4 LT |
4498 | show_swap_cache_info(); |
4499 | } | |
4500 | ||
19770b32 MG |
4501 | static void zoneref_set_zone(struct zone *zone, struct zoneref *zoneref) |
4502 | { | |
4503 | zoneref->zone = zone; | |
4504 | zoneref->zone_idx = zone_idx(zone); | |
4505 | } | |
4506 | ||
1da177e4 LT |
4507 | /* |
4508 | * Builds allocation fallback zone lists. | |
1a93205b CL |
4509 | * |
4510 | * Add all populated zones of a node to the zonelist. | |
1da177e4 | 4511 | */ |
f0c0b2b8 | 4512 | static int build_zonelists_node(pg_data_t *pgdat, struct zonelist *zonelist, |
bc732f1d | 4513 | int nr_zones) |
1da177e4 | 4514 | { |
1a93205b | 4515 | struct zone *zone; |
bc732f1d | 4516 | enum zone_type zone_type = MAX_NR_ZONES; |
02a68a5e CL |
4517 | |
4518 | do { | |
2f6726e5 | 4519 | zone_type--; |
070f8032 | 4520 | zone = pgdat->node_zones + zone_type; |
1a93205b | 4521 | if (populated_zone(zone)) { |
dd1a239f MG |
4522 | zoneref_set_zone(zone, |
4523 | &zonelist->_zonerefs[nr_zones++]); | |
070f8032 | 4524 | check_highest_zone(zone_type); |
1da177e4 | 4525 | } |
2f6726e5 | 4526 | } while (zone_type); |
bc732f1d | 4527 | |
070f8032 | 4528 | return nr_zones; |
1da177e4 LT |
4529 | } |
4530 | ||
f0c0b2b8 KH |
4531 | |
4532 | /* | |
4533 | * zonelist_order: | |
4534 | * 0 = automatic detection of better ordering. | |
4535 | * 1 = order by ([node] distance, -zonetype) | |
4536 | * 2 = order by (-zonetype, [node] distance) | |
4537 | * | |
4538 | * If not NUMA, ZONELIST_ORDER_ZONE and ZONELIST_ORDER_NODE will create | |
4539 | * the same zonelist. So only NUMA can configure this param. | |
4540 | */ | |
4541 | #define ZONELIST_ORDER_DEFAULT 0 | |
4542 | #define ZONELIST_ORDER_NODE 1 | |
4543 | #define ZONELIST_ORDER_ZONE 2 | |
4544 | ||
4545 | /* zonelist order in the kernel. | |
4546 | * set_zonelist_order() will set this to NODE or ZONE. | |
4547 | */ | |
4548 | static int current_zonelist_order = ZONELIST_ORDER_DEFAULT; | |
4549 | static char zonelist_order_name[3][8] = {"Default", "Node", "Zone"}; | |
4550 | ||
4551 | ||
1da177e4 | 4552 | #ifdef CONFIG_NUMA |
f0c0b2b8 KH |
4553 | /* The value user specified ....changed by config */ |
4554 | static int user_zonelist_order = ZONELIST_ORDER_DEFAULT; | |
4555 | /* string for sysctl */ | |
4556 | #define NUMA_ZONELIST_ORDER_LEN 16 | |
4557 | char numa_zonelist_order[16] = "default"; | |
4558 | ||
4559 | /* | |
4560 | * interface for configure zonelist ordering. | |
4561 | * command line option "numa_zonelist_order" | |
4562 | * = "[dD]efault - default, automatic configuration. | |
4563 | * = "[nN]ode - order by node locality, then by zone within node | |
4564 | * = "[zZ]one - order by zone, then by locality within zone | |
4565 | */ | |
4566 | ||
4567 | static int __parse_numa_zonelist_order(char *s) | |
4568 | { | |
4569 | if (*s == 'd' || *s == 'D') { | |
4570 | user_zonelist_order = ZONELIST_ORDER_DEFAULT; | |
4571 | } else if (*s == 'n' || *s == 'N') { | |
4572 | user_zonelist_order = ZONELIST_ORDER_NODE; | |
4573 | } else if (*s == 'z' || *s == 'Z') { | |
4574 | user_zonelist_order = ZONELIST_ORDER_ZONE; | |
4575 | } else { | |
1170532b | 4576 | pr_warn("Ignoring invalid numa_zonelist_order value: %s\n", s); |
f0c0b2b8 KH |
4577 | return -EINVAL; |
4578 | } | |
4579 | return 0; | |
4580 | } | |
4581 | ||
4582 | static __init int setup_numa_zonelist_order(char *s) | |
4583 | { | |
ecb256f8 VL |
4584 | int ret; |
4585 | ||
4586 | if (!s) | |
4587 | return 0; | |
4588 | ||
4589 | ret = __parse_numa_zonelist_order(s); | |
4590 | if (ret == 0) | |
4591 | strlcpy(numa_zonelist_order, s, NUMA_ZONELIST_ORDER_LEN); | |
4592 | ||
4593 | return ret; | |
f0c0b2b8 KH |
4594 | } |
4595 | early_param("numa_zonelist_order", setup_numa_zonelist_order); | |
4596 | ||
4597 | /* | |
4598 | * sysctl handler for numa_zonelist_order | |
4599 | */ | |
cccad5b9 | 4600 | int numa_zonelist_order_handler(struct ctl_table *table, int write, |
8d65af78 | 4601 | void __user *buffer, size_t *length, |
f0c0b2b8 KH |
4602 | loff_t *ppos) |
4603 | { | |
4604 | char saved_string[NUMA_ZONELIST_ORDER_LEN]; | |
4605 | int ret; | |
443c6f14 | 4606 | static DEFINE_MUTEX(zl_order_mutex); |
f0c0b2b8 | 4607 | |
443c6f14 | 4608 | mutex_lock(&zl_order_mutex); |
dacbde09 CG |
4609 | if (write) { |
4610 | if (strlen((char *)table->data) >= NUMA_ZONELIST_ORDER_LEN) { | |
4611 | ret = -EINVAL; | |
4612 | goto out; | |
4613 | } | |
4614 | strcpy(saved_string, (char *)table->data); | |
4615 | } | |
8d65af78 | 4616 | ret = proc_dostring(table, write, buffer, length, ppos); |
f0c0b2b8 | 4617 | if (ret) |
443c6f14 | 4618 | goto out; |
f0c0b2b8 KH |
4619 | if (write) { |
4620 | int oldval = user_zonelist_order; | |
dacbde09 CG |
4621 | |
4622 | ret = __parse_numa_zonelist_order((char *)table->data); | |
4623 | if (ret) { | |
f0c0b2b8 KH |
4624 | /* |
4625 | * bogus value. restore saved string | |
4626 | */ | |
dacbde09 | 4627 | strncpy((char *)table->data, saved_string, |
f0c0b2b8 KH |
4628 | NUMA_ZONELIST_ORDER_LEN); |
4629 | user_zonelist_order = oldval; | |
4eaf3f64 HL |
4630 | } else if (oldval != user_zonelist_order) { |
4631 | mutex_lock(&zonelists_mutex); | |
9adb62a5 | 4632 | build_all_zonelists(NULL, NULL); |
4eaf3f64 HL |
4633 | mutex_unlock(&zonelists_mutex); |
4634 | } | |
f0c0b2b8 | 4635 | } |
443c6f14 AK |
4636 | out: |
4637 | mutex_unlock(&zl_order_mutex); | |
4638 | return ret; | |
f0c0b2b8 KH |
4639 | } |
4640 | ||
4641 | ||
62bc62a8 | 4642 | #define MAX_NODE_LOAD (nr_online_nodes) |
f0c0b2b8 KH |
4643 | static int node_load[MAX_NUMNODES]; |
4644 | ||
1da177e4 | 4645 | /** |
4dc3b16b | 4646 | * find_next_best_node - find the next node that should appear in a given node's fallback list |
1da177e4 LT |
4647 | * @node: node whose fallback list we're appending |
4648 | * @used_node_mask: nodemask_t of already used nodes | |
4649 | * | |
4650 | * We use a number of factors to determine which is the next node that should | |
4651 | * appear on a given node's fallback list. The node should not have appeared | |
4652 | * already in @node's fallback list, and it should be the next closest node | |
4653 | * according to the distance array (which contains arbitrary distance values | |
4654 | * from each node to each node in the system), and should also prefer nodes | |
4655 | * with no CPUs, since presumably they'll have very little allocation pressure | |
4656 | * on them otherwise. | |
4657 | * It returns -1 if no node is found. | |
4658 | */ | |
f0c0b2b8 | 4659 | static int find_next_best_node(int node, nodemask_t *used_node_mask) |
1da177e4 | 4660 | { |
4cf808eb | 4661 | int n, val; |
1da177e4 | 4662 | int min_val = INT_MAX; |
00ef2d2f | 4663 | int best_node = NUMA_NO_NODE; |
a70f7302 | 4664 | const struct cpumask *tmp = cpumask_of_node(0); |
1da177e4 | 4665 | |
4cf808eb LT |
4666 | /* Use the local node if we haven't already */ |
4667 | if (!node_isset(node, *used_node_mask)) { | |
4668 | node_set(node, *used_node_mask); | |
4669 | return node; | |
4670 | } | |
1da177e4 | 4671 | |
4b0ef1fe | 4672 | for_each_node_state(n, N_MEMORY) { |
1da177e4 LT |
4673 | |
4674 | /* Don't want a node to appear more than once */ | |
4675 | if (node_isset(n, *used_node_mask)) | |
4676 | continue; | |
4677 | ||
1da177e4 LT |
4678 | /* Use the distance array to find the distance */ |
4679 | val = node_distance(node, n); | |
4680 | ||
4cf808eb LT |
4681 | /* Penalize nodes under us ("prefer the next node") */ |
4682 | val += (n < node); | |
4683 | ||
1da177e4 | 4684 | /* Give preference to headless and unused nodes */ |
a70f7302 RR |
4685 | tmp = cpumask_of_node(n); |
4686 | if (!cpumask_empty(tmp)) | |
1da177e4 LT |
4687 | val += PENALTY_FOR_NODE_WITH_CPUS; |
4688 | ||
4689 | /* Slight preference for less loaded node */ | |
4690 | val *= (MAX_NODE_LOAD*MAX_NUMNODES); | |
4691 | val += node_load[n]; | |
4692 | ||
4693 | if (val < min_val) { | |
4694 | min_val = val; | |
4695 | best_node = n; | |
4696 | } | |
4697 | } | |
4698 | ||
4699 | if (best_node >= 0) | |
4700 | node_set(best_node, *used_node_mask); | |
4701 | ||
4702 | return best_node; | |
4703 | } | |
4704 | ||
f0c0b2b8 KH |
4705 | |
4706 | /* | |
4707 | * Build zonelists ordered by node and zones within node. | |
4708 | * This results in maximum locality--normal zone overflows into local | |
4709 | * DMA zone, if any--but risks exhausting DMA zone. | |
4710 | */ | |
4711 | static void build_zonelists_in_node_order(pg_data_t *pgdat, int node) | |
1da177e4 | 4712 | { |
f0c0b2b8 | 4713 | int j; |
1da177e4 | 4714 | struct zonelist *zonelist; |
f0c0b2b8 | 4715 | |
54a6eb5c | 4716 | zonelist = &pgdat->node_zonelists[0]; |
dd1a239f | 4717 | for (j = 0; zonelist->_zonerefs[j].zone != NULL; j++) |
54a6eb5c | 4718 | ; |
bc732f1d | 4719 | j = build_zonelists_node(NODE_DATA(node), zonelist, j); |
dd1a239f MG |
4720 | zonelist->_zonerefs[j].zone = NULL; |
4721 | zonelist->_zonerefs[j].zone_idx = 0; | |
f0c0b2b8 KH |
4722 | } |
4723 | ||
523b9458 CL |
4724 | /* |
4725 | * Build gfp_thisnode zonelists | |
4726 | */ | |
4727 | static void build_thisnode_zonelists(pg_data_t *pgdat) | |
4728 | { | |
523b9458 CL |
4729 | int j; |
4730 | struct zonelist *zonelist; | |
4731 | ||
54a6eb5c | 4732 | zonelist = &pgdat->node_zonelists[1]; |
bc732f1d | 4733 | j = build_zonelists_node(pgdat, zonelist, 0); |
dd1a239f MG |
4734 | zonelist->_zonerefs[j].zone = NULL; |
4735 | zonelist->_zonerefs[j].zone_idx = 0; | |
523b9458 CL |
4736 | } |
4737 | ||
f0c0b2b8 KH |
4738 | /* |
4739 | * Build zonelists ordered by zone and nodes within zones. | |
4740 | * This results in conserving DMA zone[s] until all Normal memory is | |
4741 | * exhausted, but results in overflowing to remote node while memory | |
4742 | * may still exist in local DMA zone. | |
4743 | */ | |
4744 | static int node_order[MAX_NUMNODES]; | |
4745 | ||
4746 | static void build_zonelists_in_zone_order(pg_data_t *pgdat, int nr_nodes) | |
4747 | { | |
f0c0b2b8 KH |
4748 | int pos, j, node; |
4749 | int zone_type; /* needs to be signed */ | |
4750 | struct zone *z; | |
4751 | struct zonelist *zonelist; | |
4752 | ||
54a6eb5c MG |
4753 | zonelist = &pgdat->node_zonelists[0]; |
4754 | pos = 0; | |
4755 | for (zone_type = MAX_NR_ZONES - 1; zone_type >= 0; zone_type--) { | |
4756 | for (j = 0; j < nr_nodes; j++) { | |
4757 | node = node_order[j]; | |
4758 | z = &NODE_DATA(node)->node_zones[zone_type]; | |
4759 | if (populated_zone(z)) { | |
dd1a239f MG |
4760 | zoneref_set_zone(z, |
4761 | &zonelist->_zonerefs[pos++]); | |
54a6eb5c | 4762 | check_highest_zone(zone_type); |
f0c0b2b8 KH |
4763 | } |
4764 | } | |
f0c0b2b8 | 4765 | } |
dd1a239f MG |
4766 | zonelist->_zonerefs[pos].zone = NULL; |
4767 | zonelist->_zonerefs[pos].zone_idx = 0; | |
f0c0b2b8 KH |
4768 | } |
4769 | ||
3193913c MG |
4770 | #if defined(CONFIG_64BIT) |
4771 | /* | |
4772 | * Devices that require DMA32/DMA are relatively rare and do not justify a | |
4773 | * penalty to every machine in case the specialised case applies. Default | |
4774 | * to Node-ordering on 64-bit NUMA machines | |
4775 | */ | |
4776 | static int default_zonelist_order(void) | |
4777 | { | |
4778 | return ZONELIST_ORDER_NODE; | |
4779 | } | |
4780 | #else | |
4781 | /* | |
4782 | * On 32-bit, the Normal zone needs to be preserved for allocations accessible | |
4783 | * by the kernel. If processes running on node 0 deplete the low memory zone | |
4784 | * then reclaim will occur more frequency increasing stalls and potentially | |
4785 | * be easier to OOM if a large percentage of the zone is under writeback or | |
4786 | * dirty. The problem is significantly worse if CONFIG_HIGHPTE is not set. | |
4787 | * Hence, default to zone ordering on 32-bit. | |
4788 | */ | |
f0c0b2b8 KH |
4789 | static int default_zonelist_order(void) |
4790 | { | |
f0c0b2b8 KH |
4791 | return ZONELIST_ORDER_ZONE; |
4792 | } | |
3193913c | 4793 | #endif /* CONFIG_64BIT */ |
f0c0b2b8 KH |
4794 | |
4795 | static void set_zonelist_order(void) | |
4796 | { | |
4797 | if (user_zonelist_order == ZONELIST_ORDER_DEFAULT) | |
4798 | current_zonelist_order = default_zonelist_order(); | |
4799 | else | |
4800 | current_zonelist_order = user_zonelist_order; | |
4801 | } | |
4802 | ||
4803 | static void build_zonelists(pg_data_t *pgdat) | |
4804 | { | |
c00eb15a | 4805 | int i, node, load; |
1da177e4 | 4806 | nodemask_t used_mask; |
f0c0b2b8 KH |
4807 | int local_node, prev_node; |
4808 | struct zonelist *zonelist; | |
d00181b9 | 4809 | unsigned int order = current_zonelist_order; |
1da177e4 LT |
4810 | |
4811 | /* initialize zonelists */ | |
523b9458 | 4812 | for (i = 0; i < MAX_ZONELISTS; i++) { |
1da177e4 | 4813 | zonelist = pgdat->node_zonelists + i; |
dd1a239f MG |
4814 | zonelist->_zonerefs[0].zone = NULL; |
4815 | zonelist->_zonerefs[0].zone_idx = 0; | |
1da177e4 LT |
4816 | } |
4817 | ||
4818 | /* NUMA-aware ordering of nodes */ | |
4819 | local_node = pgdat->node_id; | |
62bc62a8 | 4820 | load = nr_online_nodes; |
1da177e4 LT |
4821 | prev_node = local_node; |
4822 | nodes_clear(used_mask); | |
f0c0b2b8 | 4823 | |
f0c0b2b8 | 4824 | memset(node_order, 0, sizeof(node_order)); |
c00eb15a | 4825 | i = 0; |
f0c0b2b8 | 4826 | |
1da177e4 LT |
4827 | while ((node = find_next_best_node(local_node, &used_mask)) >= 0) { |
4828 | /* | |
4829 | * We don't want to pressure a particular node. | |
4830 | * So adding penalty to the first node in same | |
4831 | * distance group to make it round-robin. | |
4832 | */ | |
957f822a DR |
4833 | if (node_distance(local_node, node) != |
4834 | node_distance(local_node, prev_node)) | |
f0c0b2b8 KH |
4835 | node_load[node] = load; |
4836 | ||
1da177e4 LT |
4837 | prev_node = node; |
4838 | load--; | |
f0c0b2b8 KH |
4839 | if (order == ZONELIST_ORDER_NODE) |
4840 | build_zonelists_in_node_order(pgdat, node); | |
4841 | else | |
c00eb15a | 4842 | node_order[i++] = node; /* remember order */ |
f0c0b2b8 | 4843 | } |
1da177e4 | 4844 | |
f0c0b2b8 KH |
4845 | if (order == ZONELIST_ORDER_ZONE) { |
4846 | /* calculate node order -- i.e., DMA last! */ | |
c00eb15a | 4847 | build_zonelists_in_zone_order(pgdat, i); |
1da177e4 | 4848 | } |
523b9458 CL |
4849 | |
4850 | build_thisnode_zonelists(pgdat); | |
1da177e4 LT |
4851 | } |
4852 | ||
7aac7898 LS |
4853 | #ifdef CONFIG_HAVE_MEMORYLESS_NODES |
4854 | /* | |
4855 | * Return node id of node used for "local" allocations. | |
4856 | * I.e., first node id of first zone in arg node's generic zonelist. | |
4857 | * Used for initializing percpu 'numa_mem', which is used primarily | |
4858 | * for kernel allocations, so use GFP_KERNEL flags to locate zonelist. | |
4859 | */ | |
4860 | int local_memory_node(int node) | |
4861 | { | |
c33d6c06 | 4862 | struct zoneref *z; |
7aac7898 | 4863 | |
c33d6c06 | 4864 | z = first_zones_zonelist(node_zonelist(node, GFP_KERNEL), |
7aac7898 | 4865 | gfp_zone(GFP_KERNEL), |
c33d6c06 MG |
4866 | NULL); |
4867 | return z->zone->node; | |
7aac7898 LS |
4868 | } |
4869 | #endif | |
f0c0b2b8 | 4870 | |
1da177e4 LT |
4871 | #else /* CONFIG_NUMA */ |
4872 | ||
f0c0b2b8 KH |
4873 | static void set_zonelist_order(void) |
4874 | { | |
4875 | current_zonelist_order = ZONELIST_ORDER_ZONE; | |
4876 | } | |
4877 | ||
4878 | static void build_zonelists(pg_data_t *pgdat) | |
1da177e4 | 4879 | { |
19655d34 | 4880 | int node, local_node; |
54a6eb5c MG |
4881 | enum zone_type j; |
4882 | struct zonelist *zonelist; | |
1da177e4 LT |
4883 | |
4884 | local_node = pgdat->node_id; | |
1da177e4 | 4885 | |
54a6eb5c | 4886 | zonelist = &pgdat->node_zonelists[0]; |
bc732f1d | 4887 | j = build_zonelists_node(pgdat, zonelist, 0); |
1da177e4 | 4888 | |
54a6eb5c MG |
4889 | /* |
4890 | * Now we build the zonelist so that it contains the zones | |
4891 | * of all the other nodes. | |
4892 | * We don't want to pressure a particular node, so when | |
4893 | * building the zones for node N, we make sure that the | |
4894 | * zones coming right after the local ones are those from | |
4895 | * node N+1 (modulo N) | |
4896 | */ | |
4897 | for (node = local_node + 1; node < MAX_NUMNODES; node++) { | |
4898 | if (!node_online(node)) | |
4899 | continue; | |
bc732f1d | 4900 | j = build_zonelists_node(NODE_DATA(node), zonelist, j); |
1da177e4 | 4901 | } |
54a6eb5c MG |
4902 | for (node = 0; node < local_node; node++) { |
4903 | if (!node_online(node)) | |
4904 | continue; | |
bc732f1d | 4905 | j = build_zonelists_node(NODE_DATA(node), zonelist, j); |
54a6eb5c MG |
4906 | } |
4907 | ||
dd1a239f MG |
4908 | zonelist->_zonerefs[j].zone = NULL; |
4909 | zonelist->_zonerefs[j].zone_idx = 0; | |
1da177e4 LT |
4910 | } |
4911 | ||
4912 | #endif /* CONFIG_NUMA */ | |
4913 | ||
99dcc3e5 CL |
4914 | /* |
4915 | * Boot pageset table. One per cpu which is going to be used for all | |
4916 | * zones and all nodes. The parameters will be set in such a way | |
4917 | * that an item put on a list will immediately be handed over to | |
4918 | * the buddy list. This is safe since pageset manipulation is done | |
4919 | * with interrupts disabled. | |
4920 | * | |
4921 | * The boot_pagesets must be kept even after bootup is complete for | |
4922 | * unused processors and/or zones. They do play a role for bootstrapping | |
4923 | * hotplugged processors. | |
4924 | * | |
4925 | * zoneinfo_show() and maybe other functions do | |
4926 | * not check if the processor is online before following the pageset pointer. | |
4927 | * Other parts of the kernel may not check if the zone is available. | |
4928 | */ | |
4929 | static void setup_pageset(struct per_cpu_pageset *p, unsigned long batch); | |
4930 | static DEFINE_PER_CPU(struct per_cpu_pageset, boot_pageset); | |
1f522509 | 4931 | static void setup_zone_pageset(struct zone *zone); |
99dcc3e5 | 4932 | |
4eaf3f64 HL |
4933 | /* |
4934 | * Global mutex to protect against size modification of zonelists | |
4935 | * as well as to serialize pageset setup for the new populated zone. | |
4936 | */ | |
4937 | DEFINE_MUTEX(zonelists_mutex); | |
4938 | ||
9b1a4d38 | 4939 | /* return values int ....just for stop_machine() */ |
4ed7e022 | 4940 | static int __build_all_zonelists(void *data) |
1da177e4 | 4941 | { |
6811378e | 4942 | int nid; |
99dcc3e5 | 4943 | int cpu; |
9adb62a5 | 4944 | pg_data_t *self = data; |
9276b1bc | 4945 | |
7f9cfb31 BL |
4946 | #ifdef CONFIG_NUMA |
4947 | memset(node_load, 0, sizeof(node_load)); | |
4948 | #endif | |
9adb62a5 JL |
4949 | |
4950 | if (self && !node_online(self->node_id)) { | |
4951 | build_zonelists(self); | |
9adb62a5 JL |
4952 | } |
4953 | ||
9276b1bc | 4954 | for_each_online_node(nid) { |
7ea1530a CL |
4955 | pg_data_t *pgdat = NODE_DATA(nid); |
4956 | ||
4957 | build_zonelists(pgdat); | |
9276b1bc | 4958 | } |
99dcc3e5 CL |
4959 | |
4960 | /* | |
4961 | * Initialize the boot_pagesets that are going to be used | |
4962 | * for bootstrapping processors. The real pagesets for | |
4963 | * each zone will be allocated later when the per cpu | |
4964 | * allocator is available. | |
4965 | * | |
4966 | * boot_pagesets are used also for bootstrapping offline | |
4967 | * cpus if the system is already booted because the pagesets | |
4968 | * are needed to initialize allocators on a specific cpu too. | |
4969 | * F.e. the percpu allocator needs the page allocator which | |
4970 | * needs the percpu allocator in order to allocate its pagesets | |
4971 | * (a chicken-egg dilemma). | |
4972 | */ | |
7aac7898 | 4973 | for_each_possible_cpu(cpu) { |
99dcc3e5 CL |
4974 | setup_pageset(&per_cpu(boot_pageset, cpu), 0); |
4975 | ||
7aac7898 LS |
4976 | #ifdef CONFIG_HAVE_MEMORYLESS_NODES |
4977 | /* | |
4978 | * We now know the "local memory node" for each node-- | |
4979 | * i.e., the node of the first zone in the generic zonelist. | |
4980 | * Set up numa_mem percpu variable for on-line cpus. During | |
4981 | * boot, only the boot cpu should be on-line; we'll init the | |
4982 | * secondary cpus' numa_mem as they come on-line. During | |
4983 | * node/memory hotplug, we'll fixup all on-line cpus. | |
4984 | */ | |
4985 | if (cpu_online(cpu)) | |
4986 | set_cpu_numa_mem(cpu, local_memory_node(cpu_to_node(cpu))); | |
4987 | #endif | |
4988 | } | |
4989 | ||
6811378e YG |
4990 | return 0; |
4991 | } | |
4992 | ||
061f67bc RV |
4993 | static noinline void __init |
4994 | build_all_zonelists_init(void) | |
4995 | { | |
4996 | __build_all_zonelists(NULL); | |
4997 | mminit_verify_zonelist(); | |
4998 | cpuset_init_current_mems_allowed(); | |
4999 | } | |
5000 | ||
4eaf3f64 HL |
5001 | /* |
5002 | * Called with zonelists_mutex held always | |
5003 | * unless system_state == SYSTEM_BOOTING. | |
061f67bc RV |
5004 | * |
5005 | * __ref due to (1) call of __meminit annotated setup_zone_pageset | |
5006 | * [we're only called with non-NULL zone through __meminit paths] and | |
5007 | * (2) call of __init annotated helper build_all_zonelists_init | |
5008 | * [protected by SYSTEM_BOOTING]. | |
4eaf3f64 | 5009 | */ |
9adb62a5 | 5010 | void __ref build_all_zonelists(pg_data_t *pgdat, struct zone *zone) |
6811378e | 5011 | { |
f0c0b2b8 KH |
5012 | set_zonelist_order(); |
5013 | ||
6811378e | 5014 | if (system_state == SYSTEM_BOOTING) { |
061f67bc | 5015 | build_all_zonelists_init(); |
6811378e | 5016 | } else { |
e9959f0f | 5017 | #ifdef CONFIG_MEMORY_HOTPLUG |
9adb62a5 JL |
5018 | if (zone) |
5019 | setup_zone_pageset(zone); | |
e9959f0f | 5020 | #endif |
dd1895e2 CS |
5021 | /* we have to stop all cpus to guarantee there is no user |
5022 | of zonelist */ | |
9adb62a5 | 5023 | stop_machine(__build_all_zonelists, pgdat, NULL); |
6811378e YG |
5024 | /* cpuset refresh routine should be here */ |
5025 | } | |
bd1e22b8 | 5026 | vm_total_pages = nr_free_pagecache_pages(); |
9ef9acb0 MG |
5027 | /* |
5028 | * Disable grouping by mobility if the number of pages in the | |
5029 | * system is too low to allow the mechanism to work. It would be | |
5030 | * more accurate, but expensive to check per-zone. This check is | |
5031 | * made on memory-hotadd so a system can start with mobility | |
5032 | * disabled and enable it later | |
5033 | */ | |
d9c23400 | 5034 | if (vm_total_pages < (pageblock_nr_pages * MIGRATE_TYPES)) |
9ef9acb0 MG |
5035 | page_group_by_mobility_disabled = 1; |
5036 | else | |
5037 | page_group_by_mobility_disabled = 0; | |
5038 | ||
756a025f JP |
5039 | pr_info("Built %i zonelists in %s order, mobility grouping %s. Total pages: %ld\n", |
5040 | nr_online_nodes, | |
5041 | zonelist_order_name[current_zonelist_order], | |
5042 | page_group_by_mobility_disabled ? "off" : "on", | |
5043 | vm_total_pages); | |
f0c0b2b8 | 5044 | #ifdef CONFIG_NUMA |
f88dfff5 | 5045 | pr_info("Policy zone: %s\n", zone_names[policy_zone]); |
f0c0b2b8 | 5046 | #endif |
1da177e4 LT |
5047 | } |
5048 | ||
5049 | /* | |
5050 | * Helper functions to size the waitqueue hash table. | |
5051 | * Essentially these want to choose hash table sizes sufficiently | |
5052 | * large so that collisions trying to wait on pages are rare. | |
5053 | * But in fact, the number of active page waitqueues on typical | |
5054 | * systems is ridiculously low, less than 200. So this is even | |
5055 | * conservative, even though it seems large. | |
5056 | * | |
5057 | * The constant PAGES_PER_WAITQUEUE specifies the ratio of pages to | |
5058 | * waitqueues, i.e. the size of the waitq table given the number of pages. | |
5059 | */ | |
5060 | #define PAGES_PER_WAITQUEUE 256 | |
5061 | ||
cca448fe | 5062 | #ifndef CONFIG_MEMORY_HOTPLUG |
02b694de | 5063 | static inline unsigned long wait_table_hash_nr_entries(unsigned long pages) |
1da177e4 LT |
5064 | { |
5065 | unsigned long size = 1; | |
5066 | ||
5067 | pages /= PAGES_PER_WAITQUEUE; | |
5068 | ||
5069 | while (size < pages) | |
5070 | size <<= 1; | |
5071 | ||
5072 | /* | |
5073 | * Once we have dozens or even hundreds of threads sleeping | |
5074 | * on IO we've got bigger problems than wait queue collision. | |
5075 | * Limit the size of the wait table to a reasonable size. | |
5076 | */ | |
5077 | size = min(size, 4096UL); | |
5078 | ||
5079 | return max(size, 4UL); | |
5080 | } | |
cca448fe YG |
5081 | #else |
5082 | /* | |
5083 | * A zone's size might be changed by hot-add, so it is not possible to determine | |
5084 | * a suitable size for its wait_table. So we use the maximum size now. | |
5085 | * | |
5086 | * The max wait table size = 4096 x sizeof(wait_queue_head_t). ie: | |
5087 | * | |
5088 | * i386 (preemption config) : 4096 x 16 = 64Kbyte. | |
5089 | * ia64, x86-64 (no preemption): 4096 x 20 = 80Kbyte. | |
5090 | * ia64, x86-64 (preemption) : 4096 x 24 = 96Kbyte. | |
5091 | * | |
5092 | * The maximum entries are prepared when a zone's memory is (512K + 256) pages | |
5093 | * or more by the traditional way. (See above). It equals: | |
5094 | * | |
5095 | * i386, x86-64, powerpc(4K page size) : = ( 2G + 1M)byte. | |
5096 | * ia64(16K page size) : = ( 8G + 4M)byte. | |
5097 | * powerpc (64K page size) : = (32G +16M)byte. | |
5098 | */ | |
5099 | static inline unsigned long wait_table_hash_nr_entries(unsigned long pages) | |
5100 | { | |
5101 | return 4096UL; | |
5102 | } | |
5103 | #endif | |
1da177e4 LT |
5104 | |
5105 | /* | |
5106 | * This is an integer logarithm so that shifts can be used later | |
5107 | * to extract the more random high bits from the multiplicative | |
5108 | * hash function before the remainder is taken. | |
5109 | */ | |
5110 | static inline unsigned long wait_table_bits(unsigned long size) | |
5111 | { | |
5112 | return ffz(~size); | |
5113 | } | |
5114 | ||
1da177e4 LT |
5115 | /* |
5116 | * Initially all pages are reserved - free ones are freed | |
5117 | * up by free_all_bootmem() once the early boot process is | |
5118 | * done. Non-atomic initialization, single-pass. | |
5119 | */ | |
c09b4240 | 5120 | void __meminit memmap_init_zone(unsigned long size, int nid, unsigned long zone, |
a2f3aa02 | 5121 | unsigned long start_pfn, enum memmap_context context) |
1da177e4 | 5122 | { |
4b94ffdc | 5123 | struct vmem_altmap *altmap = to_vmem_altmap(__pfn_to_phys(start_pfn)); |
29751f69 | 5124 | unsigned long end_pfn = start_pfn + size; |
4b94ffdc | 5125 | pg_data_t *pgdat = NODE_DATA(nid); |
29751f69 | 5126 | unsigned long pfn; |
3a80a7fa | 5127 | unsigned long nr_initialised = 0; |
342332e6 TI |
5128 | #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP |
5129 | struct memblock_region *r = NULL, *tmp; | |
5130 | #endif | |
1da177e4 | 5131 | |
22b31eec HD |
5132 | if (highest_memmap_pfn < end_pfn - 1) |
5133 | highest_memmap_pfn = end_pfn - 1; | |
5134 | ||
4b94ffdc DW |
5135 | /* |
5136 | * Honor reservation requested by the driver for this ZONE_DEVICE | |
5137 | * memory | |
5138 | */ | |
5139 | if (altmap && start_pfn == altmap->base_pfn) | |
5140 | start_pfn += altmap->reserve; | |
5141 | ||
cbe8dd4a | 5142 | for (pfn = start_pfn; pfn < end_pfn; pfn++) { |
a2f3aa02 | 5143 | /* |
b72d0ffb AM |
5144 | * There can be holes in boot-time mem_map[]s handed to this |
5145 | * function. They do not exist on hotplugged memory. | |
a2f3aa02 | 5146 | */ |
b72d0ffb AM |
5147 | if (context != MEMMAP_EARLY) |
5148 | goto not_early; | |
5149 | ||
5150 | if (!early_pfn_valid(pfn)) | |
5151 | continue; | |
5152 | if (!early_pfn_in_nid(pfn, nid)) | |
5153 | continue; | |
5154 | if (!update_defer_init(pgdat, pfn, end_pfn, &nr_initialised)) | |
5155 | break; | |
342332e6 TI |
5156 | |
5157 | #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP | |
b72d0ffb AM |
5158 | /* |
5159 | * If not mirrored_kernelcore and ZONE_MOVABLE exists, range | |
5160 | * from zone_movable_pfn[nid] to end of each node should be | |
5161 | * ZONE_MOVABLE not ZONE_NORMAL. skip it. | |
5162 | */ | |
5163 | if (!mirrored_kernelcore && zone_movable_pfn[nid]) | |
5164 | if (zone == ZONE_NORMAL && pfn >= zone_movable_pfn[nid]) | |
5165 | continue; | |
342332e6 | 5166 | |
b72d0ffb AM |
5167 | /* |
5168 | * Check given memblock attribute by firmware which can affect | |
5169 | * kernel memory layout. If zone==ZONE_MOVABLE but memory is | |
5170 | * mirrored, it's an overlapped memmap init. skip it. | |
5171 | */ | |
5172 | if (mirrored_kernelcore && zone == ZONE_MOVABLE) { | |
5173 | if (!r || pfn >= memblock_region_memory_end_pfn(r)) { | |
5174 | for_each_memblock(memory, tmp) | |
5175 | if (pfn < memblock_region_memory_end_pfn(tmp)) | |
5176 | break; | |
5177 | r = tmp; | |
5178 | } | |
5179 | if (pfn >= memblock_region_memory_base_pfn(r) && | |
5180 | memblock_is_mirror(r)) { | |
5181 | /* already initialized as NORMAL */ | |
5182 | pfn = memblock_region_memory_end_pfn(r); | |
5183 | continue; | |
342332e6 | 5184 | } |
a2f3aa02 | 5185 | } |
b72d0ffb | 5186 | #endif |
ac5d2539 | 5187 | |
b72d0ffb | 5188 | not_early: |
ac5d2539 MG |
5189 | /* |
5190 | * Mark the block movable so that blocks are reserved for | |
5191 | * movable at startup. This will force kernel allocations | |
5192 | * to reserve their blocks rather than leaking throughout | |
5193 | * the address space during boot when many long-lived | |
974a786e | 5194 | * kernel allocations are made. |
ac5d2539 MG |
5195 | * |
5196 | * bitmap is created for zone's valid pfn range. but memmap | |
5197 | * can be created for invalid pages (for alignment) | |
5198 | * check here not to call set_pageblock_migratetype() against | |
5199 | * pfn out of zone. | |
5200 | */ | |
5201 | if (!(pfn & (pageblock_nr_pages - 1))) { | |
5202 | struct page *page = pfn_to_page(pfn); | |
5203 | ||
5204 | __init_single_page(page, pfn, zone, nid); | |
5205 | set_pageblock_migratetype(page, MIGRATE_MOVABLE); | |
5206 | } else { | |
5207 | __init_single_pfn(pfn, zone, nid); | |
5208 | } | |
1da177e4 LT |
5209 | } |
5210 | } | |
5211 | ||
1e548deb | 5212 | static void __meminit zone_init_free_lists(struct zone *zone) |
1da177e4 | 5213 | { |
7aeb09f9 | 5214 | unsigned int order, t; |
b2a0ac88 MG |
5215 | for_each_migratetype_order(order, t) { |
5216 | INIT_LIST_HEAD(&zone->free_area[order].free_list[t]); | |
1da177e4 LT |
5217 | zone->free_area[order].nr_free = 0; |
5218 | } | |
5219 | } | |
5220 | ||
5221 | #ifndef __HAVE_ARCH_MEMMAP_INIT | |
5222 | #define memmap_init(size, nid, zone, start_pfn) \ | |
a2f3aa02 | 5223 | memmap_init_zone((size), (nid), (zone), (start_pfn), MEMMAP_EARLY) |
1da177e4 LT |
5224 | #endif |
5225 | ||
7cd2b0a3 | 5226 | static int zone_batchsize(struct zone *zone) |
e7c8d5c9 | 5227 | { |
3a6be87f | 5228 | #ifdef CONFIG_MMU |
e7c8d5c9 CL |
5229 | int batch; |
5230 | ||
5231 | /* | |
5232 | * The per-cpu-pages pools are set to around 1000th of the | |
ba56e91c | 5233 | * size of the zone. But no more than 1/2 of a meg. |
e7c8d5c9 CL |
5234 | * |
5235 | * OK, so we don't know how big the cache is. So guess. | |
5236 | */ | |
b40da049 | 5237 | batch = zone->managed_pages / 1024; |
ba56e91c SR |
5238 | if (batch * PAGE_SIZE > 512 * 1024) |
5239 | batch = (512 * 1024) / PAGE_SIZE; | |
e7c8d5c9 CL |
5240 | batch /= 4; /* We effectively *= 4 below */ |
5241 | if (batch < 1) | |
5242 | batch = 1; | |
5243 | ||
5244 | /* | |
0ceaacc9 NP |
5245 | * Clamp the batch to a 2^n - 1 value. Having a power |
5246 | * of 2 value was found to be more likely to have | |
5247 | * suboptimal cache aliasing properties in some cases. | |
e7c8d5c9 | 5248 | * |
0ceaacc9 NP |
5249 | * For example if 2 tasks are alternately allocating |
5250 | * batches of pages, one task can end up with a lot | |
5251 | * of pages of one half of the possible page colors | |
5252 | * and the other with pages of the other colors. | |
e7c8d5c9 | 5253 | */ |
9155203a | 5254 | batch = rounddown_pow_of_two(batch + batch/2) - 1; |
ba56e91c | 5255 | |
e7c8d5c9 | 5256 | return batch; |
3a6be87f DH |
5257 | |
5258 | #else | |
5259 | /* The deferral and batching of frees should be suppressed under NOMMU | |
5260 | * conditions. | |
5261 | * | |
5262 | * The problem is that NOMMU needs to be able to allocate large chunks | |
5263 | * of contiguous memory as there's no hardware page translation to | |
5264 | * assemble apparent contiguous memory from discontiguous pages. | |
5265 | * | |
5266 | * Queueing large contiguous runs of pages for batching, however, | |
5267 | * causes the pages to actually be freed in smaller chunks. As there | |
5268 | * can be a significant delay between the individual batches being | |
5269 | * recycled, this leads to the once large chunks of space being | |
5270 | * fragmented and becoming unavailable for high-order allocations. | |
5271 | */ | |
5272 | return 0; | |
5273 | #endif | |
e7c8d5c9 CL |
5274 | } |
5275 | ||
8d7a8fa9 CS |
5276 | /* |
5277 | * pcp->high and pcp->batch values are related and dependent on one another: | |
5278 | * ->batch must never be higher then ->high. | |
5279 | * The following function updates them in a safe manner without read side | |
5280 | * locking. | |
5281 | * | |
5282 | * Any new users of pcp->batch and pcp->high should ensure they can cope with | |
5283 | * those fields changing asynchronously (acording the the above rule). | |
5284 | * | |
5285 | * mutex_is_locked(&pcp_batch_high_lock) required when calling this function | |
5286 | * outside of boot time (or some other assurance that no concurrent updaters | |
5287 | * exist). | |
5288 | */ | |
5289 | static void pageset_update(struct per_cpu_pages *pcp, unsigned long high, | |
5290 | unsigned long batch) | |
5291 | { | |
5292 | /* start with a fail safe value for batch */ | |
5293 | pcp->batch = 1; | |
5294 | smp_wmb(); | |
5295 | ||
5296 | /* Update high, then batch, in order */ | |
5297 | pcp->high = high; | |
5298 | smp_wmb(); | |
5299 | ||
5300 | pcp->batch = batch; | |
5301 | } | |
5302 | ||
3664033c | 5303 | /* a companion to pageset_set_high() */ |
4008bab7 CS |
5304 | static void pageset_set_batch(struct per_cpu_pageset *p, unsigned long batch) |
5305 | { | |
8d7a8fa9 | 5306 | pageset_update(&p->pcp, 6 * batch, max(1UL, 1 * batch)); |
4008bab7 CS |
5307 | } |
5308 | ||
88c90dbc | 5309 | static void pageset_init(struct per_cpu_pageset *p) |
2caaad41 CL |
5310 | { |
5311 | struct per_cpu_pages *pcp; | |
5f8dcc21 | 5312 | int migratetype; |
2caaad41 | 5313 | |
1c6fe946 MD |
5314 | memset(p, 0, sizeof(*p)); |
5315 | ||
3dfa5721 | 5316 | pcp = &p->pcp; |
2caaad41 | 5317 | pcp->count = 0; |
5f8dcc21 MG |
5318 | for (migratetype = 0; migratetype < MIGRATE_PCPTYPES; migratetype++) |
5319 | INIT_LIST_HEAD(&pcp->lists[migratetype]); | |
2caaad41 CL |
5320 | } |
5321 | ||
88c90dbc CS |
5322 | static void setup_pageset(struct per_cpu_pageset *p, unsigned long batch) |
5323 | { | |
5324 | pageset_init(p); | |
5325 | pageset_set_batch(p, batch); | |
5326 | } | |
5327 | ||
8ad4b1fb | 5328 | /* |
3664033c | 5329 | * pageset_set_high() sets the high water mark for hot per_cpu_pagelist |
8ad4b1fb RS |
5330 | * to the value high for the pageset p. |
5331 | */ | |
3664033c | 5332 | static void pageset_set_high(struct per_cpu_pageset *p, |
8ad4b1fb RS |
5333 | unsigned long high) |
5334 | { | |
8d7a8fa9 CS |
5335 | unsigned long batch = max(1UL, high / 4); |
5336 | if ((high / 4) > (PAGE_SHIFT * 8)) | |
5337 | batch = PAGE_SHIFT * 8; | |
8ad4b1fb | 5338 | |
8d7a8fa9 | 5339 | pageset_update(&p->pcp, high, batch); |
8ad4b1fb RS |
5340 | } |
5341 | ||
7cd2b0a3 DR |
5342 | static void pageset_set_high_and_batch(struct zone *zone, |
5343 | struct per_cpu_pageset *pcp) | |
56cef2b8 | 5344 | { |
56cef2b8 | 5345 | if (percpu_pagelist_fraction) |
3664033c | 5346 | pageset_set_high(pcp, |
56cef2b8 CS |
5347 | (zone->managed_pages / |
5348 | percpu_pagelist_fraction)); | |
5349 | else | |
5350 | pageset_set_batch(pcp, zone_batchsize(zone)); | |
5351 | } | |
5352 | ||
169f6c19 CS |
5353 | static void __meminit zone_pageset_init(struct zone *zone, int cpu) |
5354 | { | |
5355 | struct per_cpu_pageset *pcp = per_cpu_ptr(zone->pageset, cpu); | |
5356 | ||
5357 | pageset_init(pcp); | |
5358 | pageset_set_high_and_batch(zone, pcp); | |
5359 | } | |
5360 | ||
4ed7e022 | 5361 | static void __meminit setup_zone_pageset(struct zone *zone) |
319774e2 WF |
5362 | { |
5363 | int cpu; | |
319774e2 | 5364 | zone->pageset = alloc_percpu(struct per_cpu_pageset); |
56cef2b8 CS |
5365 | for_each_possible_cpu(cpu) |
5366 | zone_pageset_init(zone, cpu); | |
319774e2 WF |
5367 | } |
5368 | ||
2caaad41 | 5369 | /* |
99dcc3e5 CL |
5370 | * Allocate per cpu pagesets and initialize them. |
5371 | * Before this call only boot pagesets were available. | |
e7c8d5c9 | 5372 | */ |
99dcc3e5 | 5373 | void __init setup_per_cpu_pageset(void) |
e7c8d5c9 | 5374 | { |
99dcc3e5 | 5375 | struct zone *zone; |
e7c8d5c9 | 5376 | |
319774e2 WF |
5377 | for_each_populated_zone(zone) |
5378 | setup_zone_pageset(zone); | |
e7c8d5c9 CL |
5379 | } |
5380 | ||
577a32f6 | 5381 | static noinline __init_refok |
cca448fe | 5382 | int zone_wait_table_init(struct zone *zone, unsigned long zone_size_pages) |
ed8ece2e DH |
5383 | { |
5384 | int i; | |
cca448fe | 5385 | size_t alloc_size; |
ed8ece2e DH |
5386 | |
5387 | /* | |
5388 | * The per-page waitqueue mechanism uses hashed waitqueues | |
5389 | * per zone. | |
5390 | */ | |
02b694de YG |
5391 | zone->wait_table_hash_nr_entries = |
5392 | wait_table_hash_nr_entries(zone_size_pages); | |
5393 | zone->wait_table_bits = | |
5394 | wait_table_bits(zone->wait_table_hash_nr_entries); | |
cca448fe YG |
5395 | alloc_size = zone->wait_table_hash_nr_entries |
5396 | * sizeof(wait_queue_head_t); | |
5397 | ||
cd94b9db | 5398 | if (!slab_is_available()) { |
cca448fe | 5399 | zone->wait_table = (wait_queue_head_t *) |
6782832e SS |
5400 | memblock_virt_alloc_node_nopanic( |
5401 | alloc_size, zone->zone_pgdat->node_id); | |
cca448fe YG |
5402 | } else { |
5403 | /* | |
5404 | * This case means that a zone whose size was 0 gets new memory | |
5405 | * via memory hot-add. | |
5406 | * But it may be the case that a new node was hot-added. In | |
5407 | * this case vmalloc() will not be able to use this new node's | |
5408 | * memory - this wait_table must be initialized to use this new | |
5409 | * node itself as well. | |
5410 | * To use this new node's memory, further consideration will be | |
5411 | * necessary. | |
5412 | */ | |
8691f3a7 | 5413 | zone->wait_table = vmalloc(alloc_size); |
cca448fe YG |
5414 | } |
5415 | if (!zone->wait_table) | |
5416 | return -ENOMEM; | |
ed8ece2e | 5417 | |
b8af2941 | 5418 | for (i = 0; i < zone->wait_table_hash_nr_entries; ++i) |
ed8ece2e | 5419 | init_waitqueue_head(zone->wait_table + i); |
cca448fe YG |
5420 | |
5421 | return 0; | |
ed8ece2e DH |
5422 | } |
5423 | ||
c09b4240 | 5424 | static __meminit void zone_pcp_init(struct zone *zone) |
ed8ece2e | 5425 | { |
99dcc3e5 CL |
5426 | /* |
5427 | * per cpu subsystem is not up at this point. The following code | |
5428 | * relies on the ability of the linker to provide the | |
5429 | * offset of a (static) per cpu variable into the per cpu area. | |
5430 | */ | |
5431 | zone->pageset = &boot_pageset; | |
ed8ece2e | 5432 | |
b38a8725 | 5433 | if (populated_zone(zone)) |
99dcc3e5 CL |
5434 | printk(KERN_DEBUG " %s zone: %lu pages, LIFO batch:%u\n", |
5435 | zone->name, zone->present_pages, | |
5436 | zone_batchsize(zone)); | |
ed8ece2e DH |
5437 | } |
5438 | ||
4ed7e022 | 5439 | int __meminit init_currently_empty_zone(struct zone *zone, |
718127cc | 5440 | unsigned long zone_start_pfn, |
b171e409 | 5441 | unsigned long size) |
ed8ece2e DH |
5442 | { |
5443 | struct pglist_data *pgdat = zone->zone_pgdat; | |
cca448fe YG |
5444 | int ret; |
5445 | ret = zone_wait_table_init(zone, size); | |
5446 | if (ret) | |
5447 | return ret; | |
ed8ece2e DH |
5448 | pgdat->nr_zones = zone_idx(zone) + 1; |
5449 | ||
ed8ece2e DH |
5450 | zone->zone_start_pfn = zone_start_pfn; |
5451 | ||
708614e6 MG |
5452 | mminit_dprintk(MMINIT_TRACE, "memmap_init", |
5453 | "Initialising map node %d zone %lu pfns %lu -> %lu\n", | |
5454 | pgdat->node_id, | |
5455 | (unsigned long)zone_idx(zone), | |
5456 | zone_start_pfn, (zone_start_pfn + size)); | |
5457 | ||
1e548deb | 5458 | zone_init_free_lists(zone); |
718127cc YG |
5459 | |
5460 | return 0; | |
ed8ece2e DH |
5461 | } |
5462 | ||
0ee332c1 | 5463 | #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP |
c713216d | 5464 | #ifndef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID |
8a942fde | 5465 | |
c713216d MG |
5466 | /* |
5467 | * Required by SPARSEMEM. Given a PFN, return what node the PFN is on. | |
c713216d | 5468 | */ |
8a942fde MG |
5469 | int __meminit __early_pfn_to_nid(unsigned long pfn, |
5470 | struct mminit_pfnnid_cache *state) | |
c713216d | 5471 | { |
c13291a5 | 5472 | unsigned long start_pfn, end_pfn; |
e76b63f8 | 5473 | int nid; |
7c243c71 | 5474 | |
8a942fde MG |
5475 | if (state->last_start <= pfn && pfn < state->last_end) |
5476 | return state->last_nid; | |
c713216d | 5477 | |
e76b63f8 YL |
5478 | nid = memblock_search_pfn_nid(pfn, &start_pfn, &end_pfn); |
5479 | if (nid != -1) { | |
8a942fde MG |
5480 | state->last_start = start_pfn; |
5481 | state->last_end = end_pfn; | |
5482 | state->last_nid = nid; | |
e76b63f8 YL |
5483 | } |
5484 | ||
5485 | return nid; | |
c713216d MG |
5486 | } |
5487 | #endif /* CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID */ | |
5488 | ||
c713216d | 5489 | /** |
6782832e | 5490 | * free_bootmem_with_active_regions - Call memblock_free_early_nid for each active range |
88ca3b94 | 5491 | * @nid: The node to free memory on. If MAX_NUMNODES, all nodes are freed. |
6782832e | 5492 | * @max_low_pfn: The highest PFN that will be passed to memblock_free_early_nid |
c713216d | 5493 | * |
7d018176 ZZ |
5494 | * If an architecture guarantees that all ranges registered contain no holes |
5495 | * and may be freed, this this function may be used instead of calling | |
5496 | * memblock_free_early_nid() manually. | |
c713216d | 5497 | */ |
c13291a5 | 5498 | void __init free_bootmem_with_active_regions(int nid, unsigned long max_low_pfn) |
cc289894 | 5499 | { |
c13291a5 TH |
5500 | unsigned long start_pfn, end_pfn; |
5501 | int i, this_nid; | |
edbe7d23 | 5502 | |
c13291a5 TH |
5503 | for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, &this_nid) { |
5504 | start_pfn = min(start_pfn, max_low_pfn); | |
5505 | end_pfn = min(end_pfn, max_low_pfn); | |
edbe7d23 | 5506 | |
c13291a5 | 5507 | if (start_pfn < end_pfn) |
6782832e SS |
5508 | memblock_free_early_nid(PFN_PHYS(start_pfn), |
5509 | (end_pfn - start_pfn) << PAGE_SHIFT, | |
5510 | this_nid); | |
edbe7d23 | 5511 | } |
edbe7d23 | 5512 | } |
edbe7d23 | 5513 | |
c713216d MG |
5514 | /** |
5515 | * sparse_memory_present_with_active_regions - Call memory_present for each active range | |
88ca3b94 | 5516 | * @nid: The node to call memory_present for. If MAX_NUMNODES, all nodes will be used. |
c713216d | 5517 | * |
7d018176 ZZ |
5518 | * If an architecture guarantees that all ranges registered contain no holes and may |
5519 | * be freed, this function may be used instead of calling memory_present() manually. | |
c713216d MG |
5520 | */ |
5521 | void __init sparse_memory_present_with_active_regions(int nid) | |
5522 | { | |
c13291a5 TH |
5523 | unsigned long start_pfn, end_pfn; |
5524 | int i, this_nid; | |
c713216d | 5525 | |
c13291a5 TH |
5526 | for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, &this_nid) |
5527 | memory_present(this_nid, start_pfn, end_pfn); | |
c713216d MG |
5528 | } |
5529 | ||
5530 | /** | |
5531 | * get_pfn_range_for_nid - Return the start and end page frames for a node | |
88ca3b94 RD |
5532 | * @nid: The nid to return the range for. If MAX_NUMNODES, the min and max PFN are returned. |
5533 | * @start_pfn: Passed by reference. On return, it will have the node start_pfn. | |
5534 | * @end_pfn: Passed by reference. On return, it will have the node end_pfn. | |
c713216d MG |
5535 | * |
5536 | * It returns the start and end page frame of a node based on information | |
7d018176 | 5537 | * provided by memblock_set_node(). If called for a node |
c713216d | 5538 | * with no available memory, a warning is printed and the start and end |
88ca3b94 | 5539 | * PFNs will be 0. |
c713216d | 5540 | */ |
a3142c8e | 5541 | void __meminit get_pfn_range_for_nid(unsigned int nid, |
c713216d MG |
5542 | unsigned long *start_pfn, unsigned long *end_pfn) |
5543 | { | |
c13291a5 | 5544 | unsigned long this_start_pfn, this_end_pfn; |
c713216d | 5545 | int i; |
c13291a5 | 5546 | |
c713216d MG |
5547 | *start_pfn = -1UL; |
5548 | *end_pfn = 0; | |
5549 | ||
c13291a5 TH |
5550 | for_each_mem_pfn_range(i, nid, &this_start_pfn, &this_end_pfn, NULL) { |
5551 | *start_pfn = min(*start_pfn, this_start_pfn); | |
5552 | *end_pfn = max(*end_pfn, this_end_pfn); | |
c713216d MG |
5553 | } |
5554 | ||
633c0666 | 5555 | if (*start_pfn == -1UL) |
c713216d | 5556 | *start_pfn = 0; |
c713216d MG |
5557 | } |
5558 | ||
2a1e274a MG |
5559 | /* |
5560 | * This finds a zone that can be used for ZONE_MOVABLE pages. The | |
5561 | * assumption is made that zones within a node are ordered in monotonic | |
5562 | * increasing memory addresses so that the "highest" populated zone is used | |
5563 | */ | |
b69a7288 | 5564 | static void __init find_usable_zone_for_movable(void) |
2a1e274a MG |
5565 | { |
5566 | int zone_index; | |
5567 | for (zone_index = MAX_NR_ZONES - 1; zone_index >= 0; zone_index--) { | |
5568 | if (zone_index == ZONE_MOVABLE) | |
5569 | continue; | |
5570 | ||
5571 | if (arch_zone_highest_possible_pfn[zone_index] > | |
5572 | arch_zone_lowest_possible_pfn[zone_index]) | |
5573 | break; | |
5574 | } | |
5575 | ||
5576 | VM_BUG_ON(zone_index == -1); | |
5577 | movable_zone = zone_index; | |
5578 | } | |
5579 | ||
5580 | /* | |
5581 | * The zone ranges provided by the architecture do not include ZONE_MOVABLE | |
25985edc | 5582 | * because it is sized independent of architecture. Unlike the other zones, |
2a1e274a MG |
5583 | * the starting point for ZONE_MOVABLE is not fixed. It may be different |
5584 | * in each node depending on the size of each node and how evenly kernelcore | |
5585 | * is distributed. This helper function adjusts the zone ranges | |
5586 | * provided by the architecture for a given node by using the end of the | |
5587 | * highest usable zone for ZONE_MOVABLE. This preserves the assumption that | |
5588 | * zones within a node are in order of monotonic increases memory addresses | |
5589 | */ | |
b69a7288 | 5590 | static void __meminit adjust_zone_range_for_zone_movable(int nid, |
2a1e274a MG |
5591 | unsigned long zone_type, |
5592 | unsigned long node_start_pfn, | |
5593 | unsigned long node_end_pfn, | |
5594 | unsigned long *zone_start_pfn, | |
5595 | unsigned long *zone_end_pfn) | |
5596 | { | |
5597 | /* Only adjust if ZONE_MOVABLE is on this node */ | |
5598 | if (zone_movable_pfn[nid]) { | |
5599 | /* Size ZONE_MOVABLE */ | |
5600 | if (zone_type == ZONE_MOVABLE) { | |
5601 | *zone_start_pfn = zone_movable_pfn[nid]; | |
5602 | *zone_end_pfn = min(node_end_pfn, | |
5603 | arch_zone_highest_possible_pfn[movable_zone]); | |
5604 | ||
2a1e274a MG |
5605 | /* Check if this whole range is within ZONE_MOVABLE */ |
5606 | } else if (*zone_start_pfn >= zone_movable_pfn[nid]) | |
5607 | *zone_start_pfn = *zone_end_pfn; | |
5608 | } | |
5609 | } | |
5610 | ||
c713216d MG |
5611 | /* |
5612 | * Return the number of pages a zone spans in a node, including holes | |
5613 | * present_pages = zone_spanned_pages_in_node() - zone_absent_pages_in_node() | |
5614 | */ | |
6ea6e688 | 5615 | static unsigned long __meminit zone_spanned_pages_in_node(int nid, |
c713216d | 5616 | unsigned long zone_type, |
7960aedd ZY |
5617 | unsigned long node_start_pfn, |
5618 | unsigned long node_end_pfn, | |
d91749c1 TI |
5619 | unsigned long *zone_start_pfn, |
5620 | unsigned long *zone_end_pfn, | |
c713216d MG |
5621 | unsigned long *ignored) |
5622 | { | |
b5685e92 | 5623 | /* When hotadd a new node from cpu_up(), the node should be empty */ |
f9126ab9 XQ |
5624 | if (!node_start_pfn && !node_end_pfn) |
5625 | return 0; | |
5626 | ||
7960aedd | 5627 | /* Get the start and end of the zone */ |
d91749c1 TI |
5628 | *zone_start_pfn = arch_zone_lowest_possible_pfn[zone_type]; |
5629 | *zone_end_pfn = arch_zone_highest_possible_pfn[zone_type]; | |
2a1e274a MG |
5630 | adjust_zone_range_for_zone_movable(nid, zone_type, |
5631 | node_start_pfn, node_end_pfn, | |
d91749c1 | 5632 | zone_start_pfn, zone_end_pfn); |
c713216d MG |
5633 | |
5634 | /* Check that this node has pages within the zone's required range */ | |
d91749c1 | 5635 | if (*zone_end_pfn < node_start_pfn || *zone_start_pfn > node_end_pfn) |
c713216d MG |
5636 | return 0; |
5637 | ||
5638 | /* Move the zone boundaries inside the node if necessary */ | |
d91749c1 TI |
5639 | *zone_end_pfn = min(*zone_end_pfn, node_end_pfn); |
5640 | *zone_start_pfn = max(*zone_start_pfn, node_start_pfn); | |
c713216d MG |
5641 | |
5642 | /* Return the spanned pages */ | |
d91749c1 | 5643 | return *zone_end_pfn - *zone_start_pfn; |
c713216d MG |
5644 | } |
5645 | ||
5646 | /* | |
5647 | * Return the number of holes in a range on a node. If nid is MAX_NUMNODES, | |
88ca3b94 | 5648 | * then all holes in the requested range will be accounted for. |
c713216d | 5649 | */ |
32996250 | 5650 | unsigned long __meminit __absent_pages_in_range(int nid, |
c713216d MG |
5651 | unsigned long range_start_pfn, |
5652 | unsigned long range_end_pfn) | |
5653 | { | |
96e907d1 TH |
5654 | unsigned long nr_absent = range_end_pfn - range_start_pfn; |
5655 | unsigned long start_pfn, end_pfn; | |
5656 | int i; | |
c713216d | 5657 | |
96e907d1 TH |
5658 | for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, NULL) { |
5659 | start_pfn = clamp(start_pfn, range_start_pfn, range_end_pfn); | |
5660 | end_pfn = clamp(end_pfn, range_start_pfn, range_end_pfn); | |
5661 | nr_absent -= end_pfn - start_pfn; | |
c713216d | 5662 | } |
96e907d1 | 5663 | return nr_absent; |
c713216d MG |
5664 | } |
5665 | ||
5666 | /** | |
5667 | * absent_pages_in_range - Return number of page frames in holes within a range | |
5668 | * @start_pfn: The start PFN to start searching for holes | |
5669 | * @end_pfn: The end PFN to stop searching for holes | |
5670 | * | |
88ca3b94 | 5671 | * It returns the number of pages frames in memory holes within a range. |
c713216d MG |
5672 | */ |
5673 | unsigned long __init absent_pages_in_range(unsigned long start_pfn, | |
5674 | unsigned long end_pfn) | |
5675 | { | |
5676 | return __absent_pages_in_range(MAX_NUMNODES, start_pfn, end_pfn); | |
5677 | } | |
5678 | ||
5679 | /* Return the number of page frames in holes in a zone on a node */ | |
6ea6e688 | 5680 | static unsigned long __meminit zone_absent_pages_in_node(int nid, |
c713216d | 5681 | unsigned long zone_type, |
7960aedd ZY |
5682 | unsigned long node_start_pfn, |
5683 | unsigned long node_end_pfn, | |
c713216d MG |
5684 | unsigned long *ignored) |
5685 | { | |
96e907d1 TH |
5686 | unsigned long zone_low = arch_zone_lowest_possible_pfn[zone_type]; |
5687 | unsigned long zone_high = arch_zone_highest_possible_pfn[zone_type]; | |
9c7cd687 | 5688 | unsigned long zone_start_pfn, zone_end_pfn; |
342332e6 | 5689 | unsigned long nr_absent; |
9c7cd687 | 5690 | |
b5685e92 | 5691 | /* When hotadd a new node from cpu_up(), the node should be empty */ |
f9126ab9 XQ |
5692 | if (!node_start_pfn && !node_end_pfn) |
5693 | return 0; | |
5694 | ||
96e907d1 TH |
5695 | zone_start_pfn = clamp(node_start_pfn, zone_low, zone_high); |
5696 | zone_end_pfn = clamp(node_end_pfn, zone_low, zone_high); | |
9c7cd687 | 5697 | |
2a1e274a MG |
5698 | adjust_zone_range_for_zone_movable(nid, zone_type, |
5699 | node_start_pfn, node_end_pfn, | |
5700 | &zone_start_pfn, &zone_end_pfn); | |
342332e6 TI |
5701 | nr_absent = __absent_pages_in_range(nid, zone_start_pfn, zone_end_pfn); |
5702 | ||
5703 | /* | |
5704 | * ZONE_MOVABLE handling. | |
5705 | * Treat pages to be ZONE_MOVABLE in ZONE_NORMAL as absent pages | |
5706 | * and vice versa. | |
5707 | */ | |
5708 | if (zone_movable_pfn[nid]) { | |
5709 | if (mirrored_kernelcore) { | |
5710 | unsigned long start_pfn, end_pfn; | |
5711 | struct memblock_region *r; | |
5712 | ||
5713 | for_each_memblock(memory, r) { | |
5714 | start_pfn = clamp(memblock_region_memory_base_pfn(r), | |
5715 | zone_start_pfn, zone_end_pfn); | |
5716 | end_pfn = clamp(memblock_region_memory_end_pfn(r), | |
5717 | zone_start_pfn, zone_end_pfn); | |
5718 | ||
5719 | if (zone_type == ZONE_MOVABLE && | |
5720 | memblock_is_mirror(r)) | |
5721 | nr_absent += end_pfn - start_pfn; | |
5722 | ||
5723 | if (zone_type == ZONE_NORMAL && | |
5724 | !memblock_is_mirror(r)) | |
5725 | nr_absent += end_pfn - start_pfn; | |
5726 | } | |
5727 | } else { | |
5728 | if (zone_type == ZONE_NORMAL) | |
5729 | nr_absent += node_end_pfn - zone_movable_pfn[nid]; | |
5730 | } | |
5731 | } | |
5732 | ||
5733 | return nr_absent; | |
c713216d | 5734 | } |
0e0b864e | 5735 | |
0ee332c1 | 5736 | #else /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ |
6ea6e688 | 5737 | static inline unsigned long __meminit zone_spanned_pages_in_node(int nid, |
c713216d | 5738 | unsigned long zone_type, |
7960aedd ZY |
5739 | unsigned long node_start_pfn, |
5740 | unsigned long node_end_pfn, | |
d91749c1 TI |
5741 | unsigned long *zone_start_pfn, |
5742 | unsigned long *zone_end_pfn, | |
c713216d MG |
5743 | unsigned long *zones_size) |
5744 | { | |
d91749c1 TI |
5745 | unsigned int zone; |
5746 | ||
5747 | *zone_start_pfn = node_start_pfn; | |
5748 | for (zone = 0; zone < zone_type; zone++) | |
5749 | *zone_start_pfn += zones_size[zone]; | |
5750 | ||
5751 | *zone_end_pfn = *zone_start_pfn + zones_size[zone_type]; | |
5752 | ||
c713216d MG |
5753 | return zones_size[zone_type]; |
5754 | } | |
5755 | ||
6ea6e688 | 5756 | static inline unsigned long __meminit zone_absent_pages_in_node(int nid, |
c713216d | 5757 | unsigned long zone_type, |
7960aedd ZY |
5758 | unsigned long node_start_pfn, |
5759 | unsigned long node_end_pfn, | |
c713216d MG |
5760 | unsigned long *zholes_size) |
5761 | { | |
5762 | if (!zholes_size) | |
5763 | return 0; | |
5764 | ||
5765 | return zholes_size[zone_type]; | |
5766 | } | |
20e6926d | 5767 | |
0ee332c1 | 5768 | #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ |
c713216d | 5769 | |
a3142c8e | 5770 | static void __meminit calculate_node_totalpages(struct pglist_data *pgdat, |
7960aedd ZY |
5771 | unsigned long node_start_pfn, |
5772 | unsigned long node_end_pfn, | |
5773 | unsigned long *zones_size, | |
5774 | unsigned long *zholes_size) | |
c713216d | 5775 | { |
febd5949 | 5776 | unsigned long realtotalpages = 0, totalpages = 0; |
c713216d MG |
5777 | enum zone_type i; |
5778 | ||
febd5949 GZ |
5779 | for (i = 0; i < MAX_NR_ZONES; i++) { |
5780 | struct zone *zone = pgdat->node_zones + i; | |
d91749c1 | 5781 | unsigned long zone_start_pfn, zone_end_pfn; |
febd5949 | 5782 | unsigned long size, real_size; |
c713216d | 5783 | |
febd5949 GZ |
5784 | size = zone_spanned_pages_in_node(pgdat->node_id, i, |
5785 | node_start_pfn, | |
5786 | node_end_pfn, | |
d91749c1 TI |
5787 | &zone_start_pfn, |
5788 | &zone_end_pfn, | |
febd5949 GZ |
5789 | zones_size); |
5790 | real_size = size - zone_absent_pages_in_node(pgdat->node_id, i, | |
7960aedd ZY |
5791 | node_start_pfn, node_end_pfn, |
5792 | zholes_size); | |
d91749c1 TI |
5793 | if (size) |
5794 | zone->zone_start_pfn = zone_start_pfn; | |
5795 | else | |
5796 | zone->zone_start_pfn = 0; | |
febd5949 GZ |
5797 | zone->spanned_pages = size; |
5798 | zone->present_pages = real_size; | |
5799 | ||
5800 | totalpages += size; | |
5801 | realtotalpages += real_size; | |
5802 | } | |
5803 | ||
5804 | pgdat->node_spanned_pages = totalpages; | |
c713216d MG |
5805 | pgdat->node_present_pages = realtotalpages; |
5806 | printk(KERN_DEBUG "On node %d totalpages: %lu\n", pgdat->node_id, | |
5807 | realtotalpages); | |
5808 | } | |
5809 | ||
835c134e MG |
5810 | #ifndef CONFIG_SPARSEMEM |
5811 | /* | |
5812 | * Calculate the size of the zone->blockflags rounded to an unsigned long | |
d9c23400 MG |
5813 | * Start by making sure zonesize is a multiple of pageblock_order by rounding |
5814 | * up. Then use 1 NR_PAGEBLOCK_BITS worth of bits per pageblock, finally | |
835c134e MG |
5815 | * round what is now in bits to nearest long in bits, then return it in |
5816 | * bytes. | |
5817 | */ | |
7c45512d | 5818 | static unsigned long __init usemap_size(unsigned long zone_start_pfn, unsigned long zonesize) |
835c134e MG |
5819 | { |
5820 | unsigned long usemapsize; | |
5821 | ||
7c45512d | 5822 | zonesize += zone_start_pfn & (pageblock_nr_pages-1); |
d9c23400 MG |
5823 | usemapsize = roundup(zonesize, pageblock_nr_pages); |
5824 | usemapsize = usemapsize >> pageblock_order; | |
835c134e MG |
5825 | usemapsize *= NR_PAGEBLOCK_BITS; |
5826 | usemapsize = roundup(usemapsize, 8 * sizeof(unsigned long)); | |
5827 | ||
5828 | return usemapsize / 8; | |
5829 | } | |
5830 | ||
5831 | static void __init setup_usemap(struct pglist_data *pgdat, | |
7c45512d LT |
5832 | struct zone *zone, |
5833 | unsigned long zone_start_pfn, | |
5834 | unsigned long zonesize) | |
835c134e | 5835 | { |
7c45512d | 5836 | unsigned long usemapsize = usemap_size(zone_start_pfn, zonesize); |
835c134e | 5837 | zone->pageblock_flags = NULL; |
58a01a45 | 5838 | if (usemapsize) |
6782832e SS |
5839 | zone->pageblock_flags = |
5840 | memblock_virt_alloc_node_nopanic(usemapsize, | |
5841 | pgdat->node_id); | |
835c134e MG |
5842 | } |
5843 | #else | |
7c45512d LT |
5844 | static inline void setup_usemap(struct pglist_data *pgdat, struct zone *zone, |
5845 | unsigned long zone_start_pfn, unsigned long zonesize) {} | |
835c134e MG |
5846 | #endif /* CONFIG_SPARSEMEM */ |
5847 | ||
d9c23400 | 5848 | #ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE |
ba72cb8c | 5849 | |
d9c23400 | 5850 | /* Initialise the number of pages represented by NR_PAGEBLOCK_BITS */ |
15ca220e | 5851 | void __paginginit set_pageblock_order(void) |
d9c23400 | 5852 | { |
955c1cd7 AM |
5853 | unsigned int order; |
5854 | ||
d9c23400 MG |
5855 | /* Check that pageblock_nr_pages has not already been setup */ |
5856 | if (pageblock_order) | |
5857 | return; | |
5858 | ||
955c1cd7 AM |
5859 | if (HPAGE_SHIFT > PAGE_SHIFT) |
5860 | order = HUGETLB_PAGE_ORDER; | |
5861 | else | |
5862 | order = MAX_ORDER - 1; | |
5863 | ||
d9c23400 MG |
5864 | /* |
5865 | * Assume the largest contiguous order of interest is a huge page. | |
955c1cd7 AM |
5866 | * This value may be variable depending on boot parameters on IA64 and |
5867 | * powerpc. | |
d9c23400 MG |
5868 | */ |
5869 | pageblock_order = order; | |
5870 | } | |
5871 | #else /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */ | |
5872 | ||
ba72cb8c MG |
5873 | /* |
5874 | * When CONFIG_HUGETLB_PAGE_SIZE_VARIABLE is not set, set_pageblock_order() | |
955c1cd7 AM |
5875 | * is unused as pageblock_order is set at compile-time. See |
5876 | * include/linux/pageblock-flags.h for the values of pageblock_order based on | |
5877 | * the kernel config | |
ba72cb8c | 5878 | */ |
15ca220e | 5879 | void __paginginit set_pageblock_order(void) |
ba72cb8c | 5880 | { |
ba72cb8c | 5881 | } |
d9c23400 MG |
5882 | |
5883 | #endif /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */ | |
5884 | ||
01cefaef JL |
5885 | static unsigned long __paginginit calc_memmap_size(unsigned long spanned_pages, |
5886 | unsigned long present_pages) | |
5887 | { | |
5888 | unsigned long pages = spanned_pages; | |
5889 | ||
5890 | /* | |
5891 | * Provide a more accurate estimation if there are holes within | |
5892 | * the zone and SPARSEMEM is in use. If there are holes within the | |
5893 | * zone, each populated memory region may cost us one or two extra | |
5894 | * memmap pages due to alignment because memmap pages for each | |
5895 | * populated regions may not naturally algined on page boundary. | |
5896 | * So the (present_pages >> 4) heuristic is a tradeoff for that. | |
5897 | */ | |
5898 | if (spanned_pages > present_pages + (present_pages >> 4) && | |
5899 | IS_ENABLED(CONFIG_SPARSEMEM)) | |
5900 | pages = present_pages; | |
5901 | ||
5902 | return PAGE_ALIGN(pages * sizeof(struct page)) >> PAGE_SHIFT; | |
5903 | } | |
5904 | ||
1da177e4 LT |
5905 | /* |
5906 | * Set up the zone data structures: | |
5907 | * - mark all pages reserved | |
5908 | * - mark all memory queues empty | |
5909 | * - clear the memory bitmaps | |
6527af5d MK |
5910 | * |
5911 | * NOTE: pgdat should get zeroed by caller. | |
1da177e4 | 5912 | */ |
7f3eb55b | 5913 | static void __paginginit free_area_init_core(struct pglist_data *pgdat) |
1da177e4 | 5914 | { |
2f1b6248 | 5915 | enum zone_type j; |
ed8ece2e | 5916 | int nid = pgdat->node_id; |
718127cc | 5917 | int ret; |
1da177e4 | 5918 | |
208d54e5 | 5919 | pgdat_resize_init(pgdat); |
8177a420 AA |
5920 | #ifdef CONFIG_NUMA_BALANCING |
5921 | spin_lock_init(&pgdat->numabalancing_migrate_lock); | |
5922 | pgdat->numabalancing_migrate_nr_pages = 0; | |
5923 | pgdat->numabalancing_migrate_next_window = jiffies; | |
a3d0a918 KS |
5924 | #endif |
5925 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
5926 | spin_lock_init(&pgdat->split_queue_lock); | |
5927 | INIT_LIST_HEAD(&pgdat->split_queue); | |
5928 | pgdat->split_queue_len = 0; | |
8177a420 | 5929 | #endif |
1da177e4 | 5930 | init_waitqueue_head(&pgdat->kswapd_wait); |
5515061d | 5931 | init_waitqueue_head(&pgdat->pfmemalloc_wait); |
698b1b30 VB |
5932 | #ifdef CONFIG_COMPACTION |
5933 | init_waitqueue_head(&pgdat->kcompactd_wait); | |
5934 | #endif | |
eefa864b | 5935 | pgdat_page_ext_init(pgdat); |
5f63b720 | 5936 | |
1da177e4 LT |
5937 | for (j = 0; j < MAX_NR_ZONES; j++) { |
5938 | struct zone *zone = pgdat->node_zones + j; | |
9feedc9d | 5939 | unsigned long size, realsize, freesize, memmap_pages; |
d91749c1 | 5940 | unsigned long zone_start_pfn = zone->zone_start_pfn; |
1da177e4 | 5941 | |
febd5949 GZ |
5942 | size = zone->spanned_pages; |
5943 | realsize = freesize = zone->present_pages; | |
1da177e4 | 5944 | |
0e0b864e | 5945 | /* |
9feedc9d | 5946 | * Adjust freesize so that it accounts for how much memory |
0e0b864e MG |
5947 | * is used by this zone for memmap. This affects the watermark |
5948 | * and per-cpu initialisations | |
5949 | */ | |
01cefaef | 5950 | memmap_pages = calc_memmap_size(size, realsize); |
ba914f48 ZH |
5951 | if (!is_highmem_idx(j)) { |
5952 | if (freesize >= memmap_pages) { | |
5953 | freesize -= memmap_pages; | |
5954 | if (memmap_pages) | |
5955 | printk(KERN_DEBUG | |
5956 | " %s zone: %lu pages used for memmap\n", | |
5957 | zone_names[j], memmap_pages); | |
5958 | } else | |
1170532b | 5959 | pr_warn(" %s zone: %lu pages exceeds freesize %lu\n", |
ba914f48 ZH |
5960 | zone_names[j], memmap_pages, freesize); |
5961 | } | |
0e0b864e | 5962 | |
6267276f | 5963 | /* Account for reserved pages */ |
9feedc9d JL |
5964 | if (j == 0 && freesize > dma_reserve) { |
5965 | freesize -= dma_reserve; | |
d903ef9f | 5966 | printk(KERN_DEBUG " %s zone: %lu pages reserved\n", |
6267276f | 5967 | zone_names[0], dma_reserve); |
0e0b864e MG |
5968 | } |
5969 | ||
98d2b0eb | 5970 | if (!is_highmem_idx(j)) |
9feedc9d | 5971 | nr_kernel_pages += freesize; |
01cefaef JL |
5972 | /* Charge for highmem memmap if there are enough kernel pages */ |
5973 | else if (nr_kernel_pages > memmap_pages * 2) | |
5974 | nr_kernel_pages -= memmap_pages; | |
9feedc9d | 5975 | nr_all_pages += freesize; |
1da177e4 | 5976 | |
9feedc9d JL |
5977 | /* |
5978 | * Set an approximate value for lowmem here, it will be adjusted | |
5979 | * when the bootmem allocator frees pages into the buddy system. | |
5980 | * And all highmem pages will be managed by the buddy system. | |
5981 | */ | |
5982 | zone->managed_pages = is_highmem_idx(j) ? realsize : freesize; | |
9614634f | 5983 | #ifdef CONFIG_NUMA |
d5f541ed | 5984 | zone->node = nid; |
9feedc9d | 5985 | zone->min_unmapped_pages = (freesize*sysctl_min_unmapped_ratio) |
9614634f | 5986 | / 100; |
9feedc9d | 5987 | zone->min_slab_pages = (freesize * sysctl_min_slab_ratio) / 100; |
9614634f | 5988 | #endif |
1da177e4 LT |
5989 | zone->name = zone_names[j]; |
5990 | spin_lock_init(&zone->lock); | |
5991 | spin_lock_init(&zone->lru_lock); | |
bdc8cb98 | 5992 | zone_seqlock_init(zone); |
1da177e4 | 5993 | zone->zone_pgdat = pgdat; |
ed8ece2e | 5994 | zone_pcp_init(zone); |
81c0a2bb JW |
5995 | |
5996 | /* For bootup, initialized properly in watermark setup */ | |
5997 | mod_zone_page_state(zone, NR_ALLOC_BATCH, zone->managed_pages); | |
5998 | ||
bea8c150 | 5999 | lruvec_init(&zone->lruvec); |
1da177e4 LT |
6000 | if (!size) |
6001 | continue; | |
6002 | ||
955c1cd7 | 6003 | set_pageblock_order(); |
7c45512d | 6004 | setup_usemap(pgdat, zone, zone_start_pfn, size); |
b171e409 | 6005 | ret = init_currently_empty_zone(zone, zone_start_pfn, size); |
718127cc | 6006 | BUG_ON(ret); |
76cdd58e | 6007 | memmap_init(size, nid, j, zone_start_pfn); |
1da177e4 LT |
6008 | } |
6009 | } | |
6010 | ||
577a32f6 | 6011 | static void __init_refok alloc_node_mem_map(struct pglist_data *pgdat) |
1da177e4 | 6012 | { |
b0aeba74 | 6013 | unsigned long __maybe_unused start = 0; |
a1c34a3b LA |
6014 | unsigned long __maybe_unused offset = 0; |
6015 | ||
1da177e4 LT |
6016 | /* Skip empty nodes */ |
6017 | if (!pgdat->node_spanned_pages) | |
6018 | return; | |
6019 | ||
d41dee36 | 6020 | #ifdef CONFIG_FLAT_NODE_MEM_MAP |
b0aeba74 TL |
6021 | start = pgdat->node_start_pfn & ~(MAX_ORDER_NR_PAGES - 1); |
6022 | offset = pgdat->node_start_pfn - start; | |
1da177e4 LT |
6023 | /* ia64 gets its own node_mem_map, before this, without bootmem */ |
6024 | if (!pgdat->node_mem_map) { | |
b0aeba74 | 6025 | unsigned long size, end; |
d41dee36 AW |
6026 | struct page *map; |
6027 | ||
e984bb43 BP |
6028 | /* |
6029 | * The zone's endpoints aren't required to be MAX_ORDER | |
6030 | * aligned but the node_mem_map endpoints must be in order | |
6031 | * for the buddy allocator to function correctly. | |
6032 | */ | |
108bcc96 | 6033 | end = pgdat_end_pfn(pgdat); |
e984bb43 BP |
6034 | end = ALIGN(end, MAX_ORDER_NR_PAGES); |
6035 | size = (end - start) * sizeof(struct page); | |
6f167ec7 DH |
6036 | map = alloc_remap(pgdat->node_id, size); |
6037 | if (!map) | |
6782832e SS |
6038 | map = memblock_virt_alloc_node_nopanic(size, |
6039 | pgdat->node_id); | |
a1c34a3b | 6040 | pgdat->node_mem_map = map + offset; |
1da177e4 | 6041 | } |
12d810c1 | 6042 | #ifndef CONFIG_NEED_MULTIPLE_NODES |
1da177e4 LT |
6043 | /* |
6044 | * With no DISCONTIG, the global mem_map is just set as node 0's | |
6045 | */ | |
c713216d | 6046 | if (pgdat == NODE_DATA(0)) { |
1da177e4 | 6047 | mem_map = NODE_DATA(0)->node_mem_map; |
a1c34a3b | 6048 | #if defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) || defined(CONFIG_FLATMEM) |
c713216d | 6049 | if (page_to_pfn(mem_map) != pgdat->node_start_pfn) |
a1c34a3b | 6050 | mem_map -= offset; |
0ee332c1 | 6051 | #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ |
c713216d | 6052 | } |
1da177e4 | 6053 | #endif |
d41dee36 | 6054 | #endif /* CONFIG_FLAT_NODE_MEM_MAP */ |
1da177e4 LT |
6055 | } |
6056 | ||
9109fb7b JW |
6057 | void __paginginit free_area_init_node(int nid, unsigned long *zones_size, |
6058 | unsigned long node_start_pfn, unsigned long *zholes_size) | |
1da177e4 | 6059 | { |
9109fb7b | 6060 | pg_data_t *pgdat = NODE_DATA(nid); |
7960aedd ZY |
6061 | unsigned long start_pfn = 0; |
6062 | unsigned long end_pfn = 0; | |
9109fb7b | 6063 | |
88fdf75d | 6064 | /* pg_data_t should be reset to zero when it's allocated */ |
8783b6e2 | 6065 | WARN_ON(pgdat->nr_zones || pgdat->classzone_idx); |
88fdf75d | 6066 | |
3a80a7fa | 6067 | reset_deferred_meminit(pgdat); |
1da177e4 LT |
6068 | pgdat->node_id = nid; |
6069 | pgdat->node_start_pfn = node_start_pfn; | |
7960aedd ZY |
6070 | #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP |
6071 | get_pfn_range_for_nid(nid, &start_pfn, &end_pfn); | |
8d29e18a | 6072 | pr_info("Initmem setup node %d [mem %#018Lx-%#018Lx]\n", nid, |
4ada0c5a ZL |
6073 | (u64)start_pfn << PAGE_SHIFT, |
6074 | end_pfn ? ((u64)end_pfn << PAGE_SHIFT) - 1 : 0); | |
d91749c1 TI |
6075 | #else |
6076 | start_pfn = node_start_pfn; | |
7960aedd ZY |
6077 | #endif |
6078 | calculate_node_totalpages(pgdat, start_pfn, end_pfn, | |
6079 | zones_size, zholes_size); | |
1da177e4 LT |
6080 | |
6081 | alloc_node_mem_map(pgdat); | |
e8c27ac9 YL |
6082 | #ifdef CONFIG_FLAT_NODE_MEM_MAP |
6083 | printk(KERN_DEBUG "free_area_init_node: node %d, pgdat %08lx, node_mem_map %08lx\n", | |
6084 | nid, (unsigned long)pgdat, | |
6085 | (unsigned long)pgdat->node_mem_map); | |
6086 | #endif | |
1da177e4 | 6087 | |
7f3eb55b | 6088 | free_area_init_core(pgdat); |
1da177e4 LT |
6089 | } |
6090 | ||
0ee332c1 | 6091 | #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP |
418508c1 MS |
6092 | |
6093 | #if MAX_NUMNODES > 1 | |
6094 | /* | |
6095 | * Figure out the number of possible node ids. | |
6096 | */ | |
f9872caf | 6097 | void __init setup_nr_node_ids(void) |
418508c1 | 6098 | { |
904a9553 | 6099 | unsigned int highest; |
418508c1 | 6100 | |
904a9553 | 6101 | highest = find_last_bit(node_possible_map.bits, MAX_NUMNODES); |
418508c1 MS |
6102 | nr_node_ids = highest + 1; |
6103 | } | |
418508c1 MS |
6104 | #endif |
6105 | ||
1e01979c TH |
6106 | /** |
6107 | * node_map_pfn_alignment - determine the maximum internode alignment | |
6108 | * | |
6109 | * This function should be called after node map is populated and sorted. | |
6110 | * It calculates the maximum power of two alignment which can distinguish | |
6111 | * all the nodes. | |
6112 | * | |
6113 | * For example, if all nodes are 1GiB and aligned to 1GiB, the return value | |
6114 | * would indicate 1GiB alignment with (1 << (30 - PAGE_SHIFT)). If the | |
6115 | * nodes are shifted by 256MiB, 256MiB. Note that if only the last node is | |
6116 | * shifted, 1GiB is enough and this function will indicate so. | |
6117 | * | |
6118 | * This is used to test whether pfn -> nid mapping of the chosen memory | |
6119 | * model has fine enough granularity to avoid incorrect mapping for the | |
6120 | * populated node map. | |
6121 | * | |
6122 | * Returns the determined alignment in pfn's. 0 if there is no alignment | |
6123 | * requirement (single node). | |
6124 | */ | |
6125 | unsigned long __init node_map_pfn_alignment(void) | |
6126 | { | |
6127 | unsigned long accl_mask = 0, last_end = 0; | |
c13291a5 | 6128 | unsigned long start, end, mask; |
1e01979c | 6129 | int last_nid = -1; |
c13291a5 | 6130 | int i, nid; |
1e01979c | 6131 | |
c13291a5 | 6132 | for_each_mem_pfn_range(i, MAX_NUMNODES, &start, &end, &nid) { |
1e01979c TH |
6133 | if (!start || last_nid < 0 || last_nid == nid) { |
6134 | last_nid = nid; | |
6135 | last_end = end; | |
6136 | continue; | |
6137 | } | |
6138 | ||
6139 | /* | |
6140 | * Start with a mask granular enough to pin-point to the | |
6141 | * start pfn and tick off bits one-by-one until it becomes | |
6142 | * too coarse to separate the current node from the last. | |
6143 | */ | |
6144 | mask = ~((1 << __ffs(start)) - 1); | |
6145 | while (mask && last_end <= (start & (mask << 1))) | |
6146 | mask <<= 1; | |
6147 | ||
6148 | /* accumulate all internode masks */ | |
6149 | accl_mask |= mask; | |
6150 | } | |
6151 | ||
6152 | /* convert mask to number of pages */ | |
6153 | return ~accl_mask + 1; | |
6154 | } | |
6155 | ||
a6af2bc3 | 6156 | /* Find the lowest pfn for a node */ |
b69a7288 | 6157 | static unsigned long __init find_min_pfn_for_node(int nid) |
c713216d | 6158 | { |
a6af2bc3 | 6159 | unsigned long min_pfn = ULONG_MAX; |
c13291a5 TH |
6160 | unsigned long start_pfn; |
6161 | int i; | |
1abbfb41 | 6162 | |
c13291a5 TH |
6163 | for_each_mem_pfn_range(i, nid, &start_pfn, NULL, NULL) |
6164 | min_pfn = min(min_pfn, start_pfn); | |
c713216d | 6165 | |
a6af2bc3 | 6166 | if (min_pfn == ULONG_MAX) { |
1170532b | 6167 | pr_warn("Could not find start_pfn for node %d\n", nid); |
a6af2bc3 MG |
6168 | return 0; |
6169 | } | |
6170 | ||
6171 | return min_pfn; | |
c713216d MG |
6172 | } |
6173 | ||
6174 | /** | |
6175 | * find_min_pfn_with_active_regions - Find the minimum PFN registered | |
6176 | * | |
6177 | * It returns the minimum PFN based on information provided via | |
7d018176 | 6178 | * memblock_set_node(). |
c713216d MG |
6179 | */ |
6180 | unsigned long __init find_min_pfn_with_active_regions(void) | |
6181 | { | |
6182 | return find_min_pfn_for_node(MAX_NUMNODES); | |
6183 | } | |
6184 | ||
37b07e41 LS |
6185 | /* |
6186 | * early_calculate_totalpages() | |
6187 | * Sum pages in active regions for movable zone. | |
4b0ef1fe | 6188 | * Populate N_MEMORY for calculating usable_nodes. |
37b07e41 | 6189 | */ |
484f51f8 | 6190 | static unsigned long __init early_calculate_totalpages(void) |
7e63efef | 6191 | { |
7e63efef | 6192 | unsigned long totalpages = 0; |
c13291a5 TH |
6193 | unsigned long start_pfn, end_pfn; |
6194 | int i, nid; | |
6195 | ||
6196 | for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, &nid) { | |
6197 | unsigned long pages = end_pfn - start_pfn; | |
7e63efef | 6198 | |
37b07e41 LS |
6199 | totalpages += pages; |
6200 | if (pages) | |
4b0ef1fe | 6201 | node_set_state(nid, N_MEMORY); |
37b07e41 | 6202 | } |
b8af2941 | 6203 | return totalpages; |
7e63efef MG |
6204 | } |
6205 | ||
2a1e274a MG |
6206 | /* |
6207 | * Find the PFN the Movable zone begins in each node. Kernel memory | |
6208 | * is spread evenly between nodes as long as the nodes have enough | |
6209 | * memory. When they don't, some nodes will have more kernelcore than | |
6210 | * others | |
6211 | */ | |
b224ef85 | 6212 | static void __init find_zone_movable_pfns_for_nodes(void) |
2a1e274a MG |
6213 | { |
6214 | int i, nid; | |
6215 | unsigned long usable_startpfn; | |
6216 | unsigned long kernelcore_node, kernelcore_remaining; | |
66918dcd | 6217 | /* save the state before borrow the nodemask */ |
4b0ef1fe | 6218 | nodemask_t saved_node_state = node_states[N_MEMORY]; |
37b07e41 | 6219 | unsigned long totalpages = early_calculate_totalpages(); |
4b0ef1fe | 6220 | int usable_nodes = nodes_weight(node_states[N_MEMORY]); |
136199f0 | 6221 | struct memblock_region *r; |
b2f3eebe TC |
6222 | |
6223 | /* Need to find movable_zone earlier when movable_node is specified. */ | |
6224 | find_usable_zone_for_movable(); | |
6225 | ||
6226 | /* | |
6227 | * If movable_node is specified, ignore kernelcore and movablecore | |
6228 | * options. | |
6229 | */ | |
6230 | if (movable_node_is_enabled()) { | |
136199f0 EM |
6231 | for_each_memblock(memory, r) { |
6232 | if (!memblock_is_hotpluggable(r)) | |
b2f3eebe TC |
6233 | continue; |
6234 | ||
136199f0 | 6235 | nid = r->nid; |
b2f3eebe | 6236 | |
136199f0 | 6237 | usable_startpfn = PFN_DOWN(r->base); |
b2f3eebe TC |
6238 | zone_movable_pfn[nid] = zone_movable_pfn[nid] ? |
6239 | min(usable_startpfn, zone_movable_pfn[nid]) : | |
6240 | usable_startpfn; | |
6241 | } | |
6242 | ||
6243 | goto out2; | |
6244 | } | |
2a1e274a | 6245 | |
342332e6 TI |
6246 | /* |
6247 | * If kernelcore=mirror is specified, ignore movablecore option | |
6248 | */ | |
6249 | if (mirrored_kernelcore) { | |
6250 | bool mem_below_4gb_not_mirrored = false; | |
6251 | ||
6252 | for_each_memblock(memory, r) { | |
6253 | if (memblock_is_mirror(r)) | |
6254 | continue; | |
6255 | ||
6256 | nid = r->nid; | |
6257 | ||
6258 | usable_startpfn = memblock_region_memory_base_pfn(r); | |
6259 | ||
6260 | if (usable_startpfn < 0x100000) { | |
6261 | mem_below_4gb_not_mirrored = true; | |
6262 | continue; | |
6263 | } | |
6264 | ||
6265 | zone_movable_pfn[nid] = zone_movable_pfn[nid] ? | |
6266 | min(usable_startpfn, zone_movable_pfn[nid]) : | |
6267 | usable_startpfn; | |
6268 | } | |
6269 | ||
6270 | if (mem_below_4gb_not_mirrored) | |
6271 | pr_warn("This configuration results in unmirrored kernel memory."); | |
6272 | ||
6273 | goto out2; | |
6274 | } | |
6275 | ||
7e63efef | 6276 | /* |
b2f3eebe | 6277 | * If movablecore=nn[KMG] was specified, calculate what size of |
7e63efef MG |
6278 | * kernelcore that corresponds so that memory usable for |
6279 | * any allocation type is evenly spread. If both kernelcore | |
6280 | * and movablecore are specified, then the value of kernelcore | |
6281 | * will be used for required_kernelcore if it's greater than | |
6282 | * what movablecore would have allowed. | |
6283 | */ | |
6284 | if (required_movablecore) { | |
7e63efef MG |
6285 | unsigned long corepages; |
6286 | ||
6287 | /* | |
6288 | * Round-up so that ZONE_MOVABLE is at least as large as what | |
6289 | * was requested by the user | |
6290 | */ | |
6291 | required_movablecore = | |
6292 | roundup(required_movablecore, MAX_ORDER_NR_PAGES); | |
9fd745d4 | 6293 | required_movablecore = min(totalpages, required_movablecore); |
7e63efef MG |
6294 | corepages = totalpages - required_movablecore; |
6295 | ||
6296 | required_kernelcore = max(required_kernelcore, corepages); | |
6297 | } | |
6298 | ||
bde304bd XQ |
6299 | /* |
6300 | * If kernelcore was not specified or kernelcore size is larger | |
6301 | * than totalpages, there is no ZONE_MOVABLE. | |
6302 | */ | |
6303 | if (!required_kernelcore || required_kernelcore >= totalpages) | |
66918dcd | 6304 | goto out; |
2a1e274a MG |
6305 | |
6306 | /* usable_startpfn is the lowest possible pfn ZONE_MOVABLE can be at */ | |
2a1e274a MG |
6307 | usable_startpfn = arch_zone_lowest_possible_pfn[movable_zone]; |
6308 | ||
6309 | restart: | |
6310 | /* Spread kernelcore memory as evenly as possible throughout nodes */ | |
6311 | kernelcore_node = required_kernelcore / usable_nodes; | |
4b0ef1fe | 6312 | for_each_node_state(nid, N_MEMORY) { |
c13291a5 TH |
6313 | unsigned long start_pfn, end_pfn; |
6314 | ||
2a1e274a MG |
6315 | /* |
6316 | * Recalculate kernelcore_node if the division per node | |
6317 | * now exceeds what is necessary to satisfy the requested | |
6318 | * amount of memory for the kernel | |
6319 | */ | |
6320 | if (required_kernelcore < kernelcore_node) | |
6321 | kernelcore_node = required_kernelcore / usable_nodes; | |
6322 | ||
6323 | /* | |
6324 | * As the map is walked, we track how much memory is usable | |
6325 | * by the kernel using kernelcore_remaining. When it is | |
6326 | * 0, the rest of the node is usable by ZONE_MOVABLE | |
6327 | */ | |
6328 | kernelcore_remaining = kernelcore_node; | |
6329 | ||
6330 | /* Go through each range of PFNs within this node */ | |
c13291a5 | 6331 | for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, NULL) { |
2a1e274a MG |
6332 | unsigned long size_pages; |
6333 | ||
c13291a5 | 6334 | start_pfn = max(start_pfn, zone_movable_pfn[nid]); |
2a1e274a MG |
6335 | if (start_pfn >= end_pfn) |
6336 | continue; | |
6337 | ||
6338 | /* Account for what is only usable for kernelcore */ | |
6339 | if (start_pfn < usable_startpfn) { | |
6340 | unsigned long kernel_pages; | |
6341 | kernel_pages = min(end_pfn, usable_startpfn) | |
6342 | - start_pfn; | |
6343 | ||
6344 | kernelcore_remaining -= min(kernel_pages, | |
6345 | kernelcore_remaining); | |
6346 | required_kernelcore -= min(kernel_pages, | |
6347 | required_kernelcore); | |
6348 | ||
6349 | /* Continue if range is now fully accounted */ | |
6350 | if (end_pfn <= usable_startpfn) { | |
6351 | ||
6352 | /* | |
6353 | * Push zone_movable_pfn to the end so | |
6354 | * that if we have to rebalance | |
6355 | * kernelcore across nodes, we will | |
6356 | * not double account here | |
6357 | */ | |
6358 | zone_movable_pfn[nid] = end_pfn; | |
6359 | continue; | |
6360 | } | |
6361 | start_pfn = usable_startpfn; | |
6362 | } | |
6363 | ||
6364 | /* | |
6365 | * The usable PFN range for ZONE_MOVABLE is from | |
6366 | * start_pfn->end_pfn. Calculate size_pages as the | |
6367 | * number of pages used as kernelcore | |
6368 | */ | |
6369 | size_pages = end_pfn - start_pfn; | |
6370 | if (size_pages > kernelcore_remaining) | |
6371 | size_pages = kernelcore_remaining; | |
6372 | zone_movable_pfn[nid] = start_pfn + size_pages; | |
6373 | ||
6374 | /* | |
6375 | * Some kernelcore has been met, update counts and | |
6376 | * break if the kernelcore for this node has been | |
b8af2941 | 6377 | * satisfied |
2a1e274a MG |
6378 | */ |
6379 | required_kernelcore -= min(required_kernelcore, | |
6380 | size_pages); | |
6381 | kernelcore_remaining -= size_pages; | |
6382 | if (!kernelcore_remaining) | |
6383 | break; | |
6384 | } | |
6385 | } | |
6386 | ||
6387 | /* | |
6388 | * If there is still required_kernelcore, we do another pass with one | |
6389 | * less node in the count. This will push zone_movable_pfn[nid] further | |
6390 | * along on the nodes that still have memory until kernelcore is | |
b8af2941 | 6391 | * satisfied |
2a1e274a MG |
6392 | */ |
6393 | usable_nodes--; | |
6394 | if (usable_nodes && required_kernelcore > usable_nodes) | |
6395 | goto restart; | |
6396 | ||
b2f3eebe | 6397 | out2: |
2a1e274a MG |
6398 | /* Align start of ZONE_MOVABLE on all nids to MAX_ORDER_NR_PAGES */ |
6399 | for (nid = 0; nid < MAX_NUMNODES; nid++) | |
6400 | zone_movable_pfn[nid] = | |
6401 | roundup(zone_movable_pfn[nid], MAX_ORDER_NR_PAGES); | |
66918dcd | 6402 | |
20e6926d | 6403 | out: |
66918dcd | 6404 | /* restore the node_state */ |
4b0ef1fe | 6405 | node_states[N_MEMORY] = saved_node_state; |
2a1e274a MG |
6406 | } |
6407 | ||
4b0ef1fe LJ |
6408 | /* Any regular or high memory on that node ? */ |
6409 | static void check_for_memory(pg_data_t *pgdat, int nid) | |
37b07e41 | 6410 | { |
37b07e41 LS |
6411 | enum zone_type zone_type; |
6412 | ||
4b0ef1fe LJ |
6413 | if (N_MEMORY == N_NORMAL_MEMORY) |
6414 | return; | |
6415 | ||
6416 | for (zone_type = 0; zone_type <= ZONE_MOVABLE - 1; zone_type++) { | |
37b07e41 | 6417 | struct zone *zone = &pgdat->node_zones[zone_type]; |
b38a8725 | 6418 | if (populated_zone(zone)) { |
4b0ef1fe LJ |
6419 | node_set_state(nid, N_HIGH_MEMORY); |
6420 | if (N_NORMAL_MEMORY != N_HIGH_MEMORY && | |
6421 | zone_type <= ZONE_NORMAL) | |
6422 | node_set_state(nid, N_NORMAL_MEMORY); | |
d0048b0e BL |
6423 | break; |
6424 | } | |
37b07e41 | 6425 | } |
37b07e41 LS |
6426 | } |
6427 | ||
c713216d MG |
6428 | /** |
6429 | * free_area_init_nodes - Initialise all pg_data_t and zone data | |
88ca3b94 | 6430 | * @max_zone_pfn: an array of max PFNs for each zone |
c713216d MG |
6431 | * |
6432 | * This will call free_area_init_node() for each active node in the system. | |
7d018176 | 6433 | * Using the page ranges provided by memblock_set_node(), the size of each |
c713216d MG |
6434 | * zone in each node and their holes is calculated. If the maximum PFN |
6435 | * between two adjacent zones match, it is assumed that the zone is empty. | |
6436 | * For example, if arch_max_dma_pfn == arch_max_dma32_pfn, it is assumed | |
6437 | * that arch_max_dma32_pfn has no pages. It is also assumed that a zone | |
6438 | * starts where the previous one ended. For example, ZONE_DMA32 starts | |
6439 | * at arch_max_dma_pfn. | |
6440 | */ | |
6441 | void __init free_area_init_nodes(unsigned long *max_zone_pfn) | |
6442 | { | |
c13291a5 TH |
6443 | unsigned long start_pfn, end_pfn; |
6444 | int i, nid; | |
a6af2bc3 | 6445 | |
c713216d MG |
6446 | /* Record where the zone boundaries are */ |
6447 | memset(arch_zone_lowest_possible_pfn, 0, | |
6448 | sizeof(arch_zone_lowest_possible_pfn)); | |
6449 | memset(arch_zone_highest_possible_pfn, 0, | |
6450 | sizeof(arch_zone_highest_possible_pfn)); | |
6451 | arch_zone_lowest_possible_pfn[0] = find_min_pfn_with_active_regions(); | |
6452 | arch_zone_highest_possible_pfn[0] = max_zone_pfn[0]; | |
6453 | for (i = 1; i < MAX_NR_ZONES; i++) { | |
2a1e274a MG |
6454 | if (i == ZONE_MOVABLE) |
6455 | continue; | |
c713216d MG |
6456 | arch_zone_lowest_possible_pfn[i] = |
6457 | arch_zone_highest_possible_pfn[i-1]; | |
6458 | arch_zone_highest_possible_pfn[i] = | |
6459 | max(max_zone_pfn[i], arch_zone_lowest_possible_pfn[i]); | |
6460 | } | |
2a1e274a MG |
6461 | arch_zone_lowest_possible_pfn[ZONE_MOVABLE] = 0; |
6462 | arch_zone_highest_possible_pfn[ZONE_MOVABLE] = 0; | |
6463 | ||
6464 | /* Find the PFNs that ZONE_MOVABLE begins at in each node */ | |
6465 | memset(zone_movable_pfn, 0, sizeof(zone_movable_pfn)); | |
b224ef85 | 6466 | find_zone_movable_pfns_for_nodes(); |
c713216d | 6467 | |
c713216d | 6468 | /* Print out the zone ranges */ |
f88dfff5 | 6469 | pr_info("Zone ranges:\n"); |
2a1e274a MG |
6470 | for (i = 0; i < MAX_NR_ZONES; i++) { |
6471 | if (i == ZONE_MOVABLE) | |
6472 | continue; | |
f88dfff5 | 6473 | pr_info(" %-8s ", zone_names[i]); |
72f0ba02 DR |
6474 | if (arch_zone_lowest_possible_pfn[i] == |
6475 | arch_zone_highest_possible_pfn[i]) | |
f88dfff5 | 6476 | pr_cont("empty\n"); |
72f0ba02 | 6477 | else |
8d29e18a JG |
6478 | pr_cont("[mem %#018Lx-%#018Lx]\n", |
6479 | (u64)arch_zone_lowest_possible_pfn[i] | |
6480 | << PAGE_SHIFT, | |
6481 | ((u64)arch_zone_highest_possible_pfn[i] | |
a62e2f4f | 6482 | << PAGE_SHIFT) - 1); |
2a1e274a MG |
6483 | } |
6484 | ||
6485 | /* Print out the PFNs ZONE_MOVABLE begins at in each node */ | |
f88dfff5 | 6486 | pr_info("Movable zone start for each node\n"); |
2a1e274a MG |
6487 | for (i = 0; i < MAX_NUMNODES; i++) { |
6488 | if (zone_movable_pfn[i]) | |
8d29e18a JG |
6489 | pr_info(" Node %d: %#018Lx\n", i, |
6490 | (u64)zone_movable_pfn[i] << PAGE_SHIFT); | |
2a1e274a | 6491 | } |
c713216d | 6492 | |
f2d52fe5 | 6493 | /* Print out the early node map */ |
f88dfff5 | 6494 | pr_info("Early memory node ranges\n"); |
c13291a5 | 6495 | for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, &nid) |
8d29e18a JG |
6496 | pr_info(" node %3d: [mem %#018Lx-%#018Lx]\n", nid, |
6497 | (u64)start_pfn << PAGE_SHIFT, | |
6498 | ((u64)end_pfn << PAGE_SHIFT) - 1); | |
c713216d MG |
6499 | |
6500 | /* Initialise every node */ | |
708614e6 | 6501 | mminit_verify_pageflags_layout(); |
8ef82866 | 6502 | setup_nr_node_ids(); |
c713216d MG |
6503 | for_each_online_node(nid) { |
6504 | pg_data_t *pgdat = NODE_DATA(nid); | |
9109fb7b | 6505 | free_area_init_node(nid, NULL, |
c713216d | 6506 | find_min_pfn_for_node(nid), NULL); |
37b07e41 LS |
6507 | |
6508 | /* Any memory on that node */ | |
6509 | if (pgdat->node_present_pages) | |
4b0ef1fe LJ |
6510 | node_set_state(nid, N_MEMORY); |
6511 | check_for_memory(pgdat, nid); | |
c713216d MG |
6512 | } |
6513 | } | |
2a1e274a | 6514 | |
7e63efef | 6515 | static int __init cmdline_parse_core(char *p, unsigned long *core) |
2a1e274a MG |
6516 | { |
6517 | unsigned long long coremem; | |
6518 | if (!p) | |
6519 | return -EINVAL; | |
6520 | ||
6521 | coremem = memparse(p, &p); | |
7e63efef | 6522 | *core = coremem >> PAGE_SHIFT; |
2a1e274a | 6523 | |
7e63efef | 6524 | /* Paranoid check that UL is enough for the coremem value */ |
2a1e274a MG |
6525 | WARN_ON((coremem >> PAGE_SHIFT) > ULONG_MAX); |
6526 | ||
6527 | return 0; | |
6528 | } | |
ed7ed365 | 6529 | |
7e63efef MG |
6530 | /* |
6531 | * kernelcore=size sets the amount of memory for use for allocations that | |
6532 | * cannot be reclaimed or migrated. | |
6533 | */ | |
6534 | static int __init cmdline_parse_kernelcore(char *p) | |
6535 | { | |
342332e6 TI |
6536 | /* parse kernelcore=mirror */ |
6537 | if (parse_option_str(p, "mirror")) { | |
6538 | mirrored_kernelcore = true; | |
6539 | return 0; | |
6540 | } | |
6541 | ||
7e63efef MG |
6542 | return cmdline_parse_core(p, &required_kernelcore); |
6543 | } | |
6544 | ||
6545 | /* | |
6546 | * movablecore=size sets the amount of memory for use for allocations that | |
6547 | * can be reclaimed or migrated. | |
6548 | */ | |
6549 | static int __init cmdline_parse_movablecore(char *p) | |
6550 | { | |
6551 | return cmdline_parse_core(p, &required_movablecore); | |
6552 | } | |
6553 | ||
ed7ed365 | 6554 | early_param("kernelcore", cmdline_parse_kernelcore); |
7e63efef | 6555 | early_param("movablecore", cmdline_parse_movablecore); |
ed7ed365 | 6556 | |
0ee332c1 | 6557 | #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ |
c713216d | 6558 | |
c3d5f5f0 JL |
6559 | void adjust_managed_page_count(struct page *page, long count) |
6560 | { | |
6561 | spin_lock(&managed_page_count_lock); | |
6562 | page_zone(page)->managed_pages += count; | |
6563 | totalram_pages += count; | |
3dcc0571 JL |
6564 | #ifdef CONFIG_HIGHMEM |
6565 | if (PageHighMem(page)) | |
6566 | totalhigh_pages += count; | |
6567 | #endif | |
c3d5f5f0 JL |
6568 | spin_unlock(&managed_page_count_lock); |
6569 | } | |
3dcc0571 | 6570 | EXPORT_SYMBOL(adjust_managed_page_count); |
c3d5f5f0 | 6571 | |
11199692 | 6572 | unsigned long free_reserved_area(void *start, void *end, int poison, char *s) |
69afade7 | 6573 | { |
11199692 JL |
6574 | void *pos; |
6575 | unsigned long pages = 0; | |
69afade7 | 6576 | |
11199692 JL |
6577 | start = (void *)PAGE_ALIGN((unsigned long)start); |
6578 | end = (void *)((unsigned long)end & PAGE_MASK); | |
6579 | for (pos = start; pos < end; pos += PAGE_SIZE, pages++) { | |
dbe67df4 | 6580 | if ((unsigned int)poison <= 0xFF) |
11199692 JL |
6581 | memset(pos, poison, PAGE_SIZE); |
6582 | free_reserved_page(virt_to_page(pos)); | |
69afade7 JL |
6583 | } |
6584 | ||
6585 | if (pages && s) | |
11199692 | 6586 | pr_info("Freeing %s memory: %ldK (%p - %p)\n", |
69afade7 JL |
6587 | s, pages << (PAGE_SHIFT - 10), start, end); |
6588 | ||
6589 | return pages; | |
6590 | } | |
11199692 | 6591 | EXPORT_SYMBOL(free_reserved_area); |
69afade7 | 6592 | |
cfa11e08 JL |
6593 | #ifdef CONFIG_HIGHMEM |
6594 | void free_highmem_page(struct page *page) | |
6595 | { | |
6596 | __free_reserved_page(page); | |
6597 | totalram_pages++; | |
7b4b2a0d | 6598 | page_zone(page)->managed_pages++; |
cfa11e08 JL |
6599 | totalhigh_pages++; |
6600 | } | |
6601 | #endif | |
6602 | ||
7ee3d4e8 JL |
6603 | |
6604 | void __init mem_init_print_info(const char *str) | |
6605 | { | |
6606 | unsigned long physpages, codesize, datasize, rosize, bss_size; | |
6607 | unsigned long init_code_size, init_data_size; | |
6608 | ||
6609 | physpages = get_num_physpages(); | |
6610 | codesize = _etext - _stext; | |
6611 | datasize = _edata - _sdata; | |
6612 | rosize = __end_rodata - __start_rodata; | |
6613 | bss_size = __bss_stop - __bss_start; | |
6614 | init_data_size = __init_end - __init_begin; | |
6615 | init_code_size = _einittext - _sinittext; | |
6616 | ||
6617 | /* | |
6618 | * Detect special cases and adjust section sizes accordingly: | |
6619 | * 1) .init.* may be embedded into .data sections | |
6620 | * 2) .init.text.* may be out of [__init_begin, __init_end], | |
6621 | * please refer to arch/tile/kernel/vmlinux.lds.S. | |
6622 | * 3) .rodata.* may be embedded into .text or .data sections. | |
6623 | */ | |
6624 | #define adj_init_size(start, end, size, pos, adj) \ | |
b8af2941 PK |
6625 | do { \ |
6626 | if (start <= pos && pos < end && size > adj) \ | |
6627 | size -= adj; \ | |
6628 | } while (0) | |
7ee3d4e8 JL |
6629 | |
6630 | adj_init_size(__init_begin, __init_end, init_data_size, | |
6631 | _sinittext, init_code_size); | |
6632 | adj_init_size(_stext, _etext, codesize, _sinittext, init_code_size); | |
6633 | adj_init_size(_sdata, _edata, datasize, __init_begin, init_data_size); | |
6634 | adj_init_size(_stext, _etext, codesize, __start_rodata, rosize); | |
6635 | adj_init_size(_sdata, _edata, datasize, __start_rodata, rosize); | |
6636 | ||
6637 | #undef adj_init_size | |
6638 | ||
756a025f | 6639 | pr_info("Memory: %luK/%luK available (%luK kernel code, %luK rwdata, %luK rodata, %luK init, %luK bss, %luK reserved, %luK cma-reserved" |
7ee3d4e8 | 6640 | #ifdef CONFIG_HIGHMEM |
756a025f | 6641 | ", %luK highmem" |
7ee3d4e8 | 6642 | #endif |
756a025f JP |
6643 | "%s%s)\n", |
6644 | nr_free_pages() << (PAGE_SHIFT - 10), | |
6645 | physpages << (PAGE_SHIFT - 10), | |
6646 | codesize >> 10, datasize >> 10, rosize >> 10, | |
6647 | (init_data_size + init_code_size) >> 10, bss_size >> 10, | |
6648 | (physpages - totalram_pages - totalcma_pages) << (PAGE_SHIFT - 10), | |
6649 | totalcma_pages << (PAGE_SHIFT - 10), | |
7ee3d4e8 | 6650 | #ifdef CONFIG_HIGHMEM |
756a025f | 6651 | totalhigh_pages << (PAGE_SHIFT - 10), |
7ee3d4e8 | 6652 | #endif |
756a025f | 6653 | str ? ", " : "", str ? str : ""); |
7ee3d4e8 JL |
6654 | } |
6655 | ||
0e0b864e | 6656 | /** |
88ca3b94 RD |
6657 | * set_dma_reserve - set the specified number of pages reserved in the first zone |
6658 | * @new_dma_reserve: The number of pages to mark reserved | |
0e0b864e | 6659 | * |
013110a7 | 6660 | * The per-cpu batchsize and zone watermarks are determined by managed_pages. |
0e0b864e MG |
6661 | * In the DMA zone, a significant percentage may be consumed by kernel image |
6662 | * and other unfreeable allocations which can skew the watermarks badly. This | |
88ca3b94 RD |
6663 | * function may optionally be used to account for unfreeable pages in the |
6664 | * first zone (e.g., ZONE_DMA). The effect will be lower watermarks and | |
6665 | * smaller per-cpu batchsize. | |
0e0b864e MG |
6666 | */ |
6667 | void __init set_dma_reserve(unsigned long new_dma_reserve) | |
6668 | { | |
6669 | dma_reserve = new_dma_reserve; | |
6670 | } | |
6671 | ||
1da177e4 LT |
6672 | void __init free_area_init(unsigned long *zones_size) |
6673 | { | |
9109fb7b | 6674 | free_area_init_node(0, zones_size, |
1da177e4 LT |
6675 | __pa(PAGE_OFFSET) >> PAGE_SHIFT, NULL); |
6676 | } | |
1da177e4 | 6677 | |
1da177e4 LT |
6678 | static int page_alloc_cpu_notify(struct notifier_block *self, |
6679 | unsigned long action, void *hcpu) | |
6680 | { | |
6681 | int cpu = (unsigned long)hcpu; | |
1da177e4 | 6682 | |
8bb78442 | 6683 | if (action == CPU_DEAD || action == CPU_DEAD_FROZEN) { |
f0cb3c76 | 6684 | lru_add_drain_cpu(cpu); |
9f8f2172 CL |
6685 | drain_pages(cpu); |
6686 | ||
6687 | /* | |
6688 | * Spill the event counters of the dead processor | |
6689 | * into the current processors event counters. | |
6690 | * This artificially elevates the count of the current | |
6691 | * processor. | |
6692 | */ | |
f8891e5e | 6693 | vm_events_fold_cpu(cpu); |
9f8f2172 CL |
6694 | |
6695 | /* | |
6696 | * Zero the differential counters of the dead processor | |
6697 | * so that the vm statistics are consistent. | |
6698 | * | |
6699 | * This is only okay since the processor is dead and cannot | |
6700 | * race with what we are doing. | |
6701 | */ | |
2bb921e5 | 6702 | cpu_vm_stats_fold(cpu); |
1da177e4 LT |
6703 | } |
6704 | return NOTIFY_OK; | |
6705 | } | |
1da177e4 LT |
6706 | |
6707 | void __init page_alloc_init(void) | |
6708 | { | |
6709 | hotcpu_notifier(page_alloc_cpu_notify, 0); | |
6710 | } | |
6711 | ||
cb45b0e9 | 6712 | /* |
34b10060 | 6713 | * calculate_totalreserve_pages - called when sysctl_lowmem_reserve_ratio |
cb45b0e9 HA |
6714 | * or min_free_kbytes changes. |
6715 | */ | |
6716 | static void calculate_totalreserve_pages(void) | |
6717 | { | |
6718 | struct pglist_data *pgdat; | |
6719 | unsigned long reserve_pages = 0; | |
2f6726e5 | 6720 | enum zone_type i, j; |
cb45b0e9 HA |
6721 | |
6722 | for_each_online_pgdat(pgdat) { | |
6723 | for (i = 0; i < MAX_NR_ZONES; i++) { | |
6724 | struct zone *zone = pgdat->node_zones + i; | |
3484b2de | 6725 | long max = 0; |
cb45b0e9 HA |
6726 | |
6727 | /* Find valid and maximum lowmem_reserve in the zone */ | |
6728 | for (j = i; j < MAX_NR_ZONES; j++) { | |
6729 | if (zone->lowmem_reserve[j] > max) | |
6730 | max = zone->lowmem_reserve[j]; | |
6731 | } | |
6732 | ||
41858966 MG |
6733 | /* we treat the high watermark as reserved pages. */ |
6734 | max += high_wmark_pages(zone); | |
cb45b0e9 | 6735 | |
b40da049 JL |
6736 | if (max > zone->managed_pages) |
6737 | max = zone->managed_pages; | |
a8d01437 JW |
6738 | |
6739 | zone->totalreserve_pages = max; | |
6740 | ||
cb45b0e9 HA |
6741 | reserve_pages += max; |
6742 | } | |
6743 | } | |
6744 | totalreserve_pages = reserve_pages; | |
6745 | } | |
6746 | ||
1da177e4 LT |
6747 | /* |
6748 | * setup_per_zone_lowmem_reserve - called whenever | |
34b10060 | 6749 | * sysctl_lowmem_reserve_ratio changes. Ensures that each zone |
1da177e4 LT |
6750 | * has a correct pages reserved value, so an adequate number of |
6751 | * pages are left in the zone after a successful __alloc_pages(). | |
6752 | */ | |
6753 | static void setup_per_zone_lowmem_reserve(void) | |
6754 | { | |
6755 | struct pglist_data *pgdat; | |
2f6726e5 | 6756 | enum zone_type j, idx; |
1da177e4 | 6757 | |
ec936fc5 | 6758 | for_each_online_pgdat(pgdat) { |
1da177e4 LT |
6759 | for (j = 0; j < MAX_NR_ZONES; j++) { |
6760 | struct zone *zone = pgdat->node_zones + j; | |
b40da049 | 6761 | unsigned long managed_pages = zone->managed_pages; |
1da177e4 LT |
6762 | |
6763 | zone->lowmem_reserve[j] = 0; | |
6764 | ||
2f6726e5 CL |
6765 | idx = j; |
6766 | while (idx) { | |
1da177e4 LT |
6767 | struct zone *lower_zone; |
6768 | ||
2f6726e5 CL |
6769 | idx--; |
6770 | ||
1da177e4 LT |
6771 | if (sysctl_lowmem_reserve_ratio[idx] < 1) |
6772 | sysctl_lowmem_reserve_ratio[idx] = 1; | |
6773 | ||
6774 | lower_zone = pgdat->node_zones + idx; | |
b40da049 | 6775 | lower_zone->lowmem_reserve[j] = managed_pages / |
1da177e4 | 6776 | sysctl_lowmem_reserve_ratio[idx]; |
b40da049 | 6777 | managed_pages += lower_zone->managed_pages; |
1da177e4 LT |
6778 | } |
6779 | } | |
6780 | } | |
cb45b0e9 HA |
6781 | |
6782 | /* update totalreserve_pages */ | |
6783 | calculate_totalreserve_pages(); | |
1da177e4 LT |
6784 | } |
6785 | ||
cfd3da1e | 6786 | static void __setup_per_zone_wmarks(void) |
1da177e4 LT |
6787 | { |
6788 | unsigned long pages_min = min_free_kbytes >> (PAGE_SHIFT - 10); | |
6789 | unsigned long lowmem_pages = 0; | |
6790 | struct zone *zone; | |
6791 | unsigned long flags; | |
6792 | ||
6793 | /* Calculate total number of !ZONE_HIGHMEM pages */ | |
6794 | for_each_zone(zone) { | |
6795 | if (!is_highmem(zone)) | |
b40da049 | 6796 | lowmem_pages += zone->managed_pages; |
1da177e4 LT |
6797 | } |
6798 | ||
6799 | for_each_zone(zone) { | |
ac924c60 AM |
6800 | u64 tmp; |
6801 | ||
1125b4e3 | 6802 | spin_lock_irqsave(&zone->lock, flags); |
b40da049 | 6803 | tmp = (u64)pages_min * zone->managed_pages; |
ac924c60 | 6804 | do_div(tmp, lowmem_pages); |
1da177e4 LT |
6805 | if (is_highmem(zone)) { |
6806 | /* | |
669ed175 NP |
6807 | * __GFP_HIGH and PF_MEMALLOC allocations usually don't |
6808 | * need highmem pages, so cap pages_min to a small | |
6809 | * value here. | |
6810 | * | |
41858966 | 6811 | * The WMARK_HIGH-WMARK_LOW and (WMARK_LOW-WMARK_MIN) |
42ff2703 | 6812 | * deltas control asynch page reclaim, and so should |
669ed175 | 6813 | * not be capped for highmem. |
1da177e4 | 6814 | */ |
90ae8d67 | 6815 | unsigned long min_pages; |
1da177e4 | 6816 | |
b40da049 | 6817 | min_pages = zone->managed_pages / 1024; |
90ae8d67 | 6818 | min_pages = clamp(min_pages, SWAP_CLUSTER_MAX, 128UL); |
41858966 | 6819 | zone->watermark[WMARK_MIN] = min_pages; |
1da177e4 | 6820 | } else { |
669ed175 NP |
6821 | /* |
6822 | * If it's a lowmem zone, reserve a number of pages | |
1da177e4 LT |
6823 | * proportionate to the zone's size. |
6824 | */ | |
41858966 | 6825 | zone->watermark[WMARK_MIN] = tmp; |
1da177e4 LT |
6826 | } |
6827 | ||
795ae7a0 JW |
6828 | /* |
6829 | * Set the kswapd watermarks distance according to the | |
6830 | * scale factor in proportion to available memory, but | |
6831 | * ensure a minimum size on small systems. | |
6832 | */ | |
6833 | tmp = max_t(u64, tmp >> 2, | |
6834 | mult_frac(zone->managed_pages, | |
6835 | watermark_scale_factor, 10000)); | |
6836 | ||
6837 | zone->watermark[WMARK_LOW] = min_wmark_pages(zone) + tmp; | |
6838 | zone->watermark[WMARK_HIGH] = min_wmark_pages(zone) + tmp * 2; | |
49f223a9 | 6839 | |
81c0a2bb | 6840 | __mod_zone_page_state(zone, NR_ALLOC_BATCH, |
abe5f972 JW |
6841 | high_wmark_pages(zone) - low_wmark_pages(zone) - |
6842 | atomic_long_read(&zone->vm_stat[NR_ALLOC_BATCH])); | |
81c0a2bb | 6843 | |
1125b4e3 | 6844 | spin_unlock_irqrestore(&zone->lock, flags); |
1da177e4 | 6845 | } |
cb45b0e9 HA |
6846 | |
6847 | /* update totalreserve_pages */ | |
6848 | calculate_totalreserve_pages(); | |
1da177e4 LT |
6849 | } |
6850 | ||
cfd3da1e MG |
6851 | /** |
6852 | * setup_per_zone_wmarks - called when min_free_kbytes changes | |
6853 | * or when memory is hot-{added|removed} | |
6854 | * | |
6855 | * Ensures that the watermark[min,low,high] values for each zone are set | |
6856 | * correctly with respect to min_free_kbytes. | |
6857 | */ | |
6858 | void setup_per_zone_wmarks(void) | |
6859 | { | |
6860 | mutex_lock(&zonelists_mutex); | |
6861 | __setup_per_zone_wmarks(); | |
6862 | mutex_unlock(&zonelists_mutex); | |
6863 | } | |
6864 | ||
1da177e4 LT |
6865 | /* |
6866 | * Initialise min_free_kbytes. | |
6867 | * | |
6868 | * For small machines we want it small (128k min). For large machines | |
6869 | * we want it large (64MB max). But it is not linear, because network | |
6870 | * bandwidth does not increase linearly with machine size. We use | |
6871 | * | |
b8af2941 | 6872 | * min_free_kbytes = 4 * sqrt(lowmem_kbytes), for better accuracy: |
1da177e4 LT |
6873 | * min_free_kbytes = sqrt(lowmem_kbytes * 16) |
6874 | * | |
6875 | * which yields | |
6876 | * | |
6877 | * 16MB: 512k | |
6878 | * 32MB: 724k | |
6879 | * 64MB: 1024k | |
6880 | * 128MB: 1448k | |
6881 | * 256MB: 2048k | |
6882 | * 512MB: 2896k | |
6883 | * 1024MB: 4096k | |
6884 | * 2048MB: 5792k | |
6885 | * 4096MB: 8192k | |
6886 | * 8192MB: 11584k | |
6887 | * 16384MB: 16384k | |
6888 | */ | |
1b79acc9 | 6889 | int __meminit init_per_zone_wmark_min(void) |
1da177e4 LT |
6890 | { |
6891 | unsigned long lowmem_kbytes; | |
5f12733e | 6892 | int new_min_free_kbytes; |
1da177e4 LT |
6893 | |
6894 | lowmem_kbytes = nr_free_buffer_pages() * (PAGE_SIZE >> 10); | |
5f12733e MH |
6895 | new_min_free_kbytes = int_sqrt(lowmem_kbytes * 16); |
6896 | ||
6897 | if (new_min_free_kbytes > user_min_free_kbytes) { | |
6898 | min_free_kbytes = new_min_free_kbytes; | |
6899 | if (min_free_kbytes < 128) | |
6900 | min_free_kbytes = 128; | |
6901 | if (min_free_kbytes > 65536) | |
6902 | min_free_kbytes = 65536; | |
6903 | } else { | |
6904 | pr_warn("min_free_kbytes is not updated to %d because user defined value %d is preferred\n", | |
6905 | new_min_free_kbytes, user_min_free_kbytes); | |
6906 | } | |
bc75d33f | 6907 | setup_per_zone_wmarks(); |
a6cccdc3 | 6908 | refresh_zone_stat_thresholds(); |
1da177e4 LT |
6909 | setup_per_zone_lowmem_reserve(); |
6910 | return 0; | |
6911 | } | |
bc22af74 | 6912 | core_initcall(init_per_zone_wmark_min) |
1da177e4 LT |
6913 | |
6914 | /* | |
b8af2941 | 6915 | * min_free_kbytes_sysctl_handler - just a wrapper around proc_dointvec() so |
1da177e4 LT |
6916 | * that we can call two helper functions whenever min_free_kbytes |
6917 | * changes. | |
6918 | */ | |
cccad5b9 | 6919 | int min_free_kbytes_sysctl_handler(struct ctl_table *table, int write, |
8d65af78 | 6920 | void __user *buffer, size_t *length, loff_t *ppos) |
1da177e4 | 6921 | { |
da8c757b HP |
6922 | int rc; |
6923 | ||
6924 | rc = proc_dointvec_minmax(table, write, buffer, length, ppos); | |
6925 | if (rc) | |
6926 | return rc; | |
6927 | ||
5f12733e MH |
6928 | if (write) { |
6929 | user_min_free_kbytes = min_free_kbytes; | |
bc75d33f | 6930 | setup_per_zone_wmarks(); |
5f12733e | 6931 | } |
1da177e4 LT |
6932 | return 0; |
6933 | } | |
6934 | ||
795ae7a0 JW |
6935 | int watermark_scale_factor_sysctl_handler(struct ctl_table *table, int write, |
6936 | void __user *buffer, size_t *length, loff_t *ppos) | |
6937 | { | |
6938 | int rc; | |
6939 | ||
6940 | rc = proc_dointvec_minmax(table, write, buffer, length, ppos); | |
6941 | if (rc) | |
6942 | return rc; | |
6943 | ||
6944 | if (write) | |
6945 | setup_per_zone_wmarks(); | |
6946 | ||
6947 | return 0; | |
6948 | } | |
6949 | ||
9614634f | 6950 | #ifdef CONFIG_NUMA |
cccad5b9 | 6951 | int sysctl_min_unmapped_ratio_sysctl_handler(struct ctl_table *table, int write, |
8d65af78 | 6952 | void __user *buffer, size_t *length, loff_t *ppos) |
9614634f CL |
6953 | { |
6954 | struct zone *zone; | |
6955 | int rc; | |
6956 | ||
8d65af78 | 6957 | rc = proc_dointvec_minmax(table, write, buffer, length, ppos); |
9614634f CL |
6958 | if (rc) |
6959 | return rc; | |
6960 | ||
6961 | for_each_zone(zone) | |
b40da049 | 6962 | zone->min_unmapped_pages = (zone->managed_pages * |
9614634f CL |
6963 | sysctl_min_unmapped_ratio) / 100; |
6964 | return 0; | |
6965 | } | |
0ff38490 | 6966 | |
cccad5b9 | 6967 | int sysctl_min_slab_ratio_sysctl_handler(struct ctl_table *table, int write, |
8d65af78 | 6968 | void __user *buffer, size_t *length, loff_t *ppos) |
0ff38490 CL |
6969 | { |
6970 | struct zone *zone; | |
6971 | int rc; | |
6972 | ||
8d65af78 | 6973 | rc = proc_dointvec_minmax(table, write, buffer, length, ppos); |
0ff38490 CL |
6974 | if (rc) |
6975 | return rc; | |
6976 | ||
6977 | for_each_zone(zone) | |
b40da049 | 6978 | zone->min_slab_pages = (zone->managed_pages * |
0ff38490 CL |
6979 | sysctl_min_slab_ratio) / 100; |
6980 | return 0; | |
6981 | } | |
9614634f CL |
6982 | #endif |
6983 | ||
1da177e4 LT |
6984 | /* |
6985 | * lowmem_reserve_ratio_sysctl_handler - just a wrapper around | |
6986 | * proc_dointvec() so that we can call setup_per_zone_lowmem_reserve() | |
6987 | * whenever sysctl_lowmem_reserve_ratio changes. | |
6988 | * | |
6989 | * The reserve ratio obviously has absolutely no relation with the | |
41858966 | 6990 | * minimum watermarks. The lowmem reserve ratio can only make sense |
1da177e4 LT |
6991 | * if in function of the boot time zone sizes. |
6992 | */ | |
cccad5b9 | 6993 | int lowmem_reserve_ratio_sysctl_handler(struct ctl_table *table, int write, |
8d65af78 | 6994 | void __user *buffer, size_t *length, loff_t *ppos) |
1da177e4 | 6995 | { |
8d65af78 | 6996 | proc_dointvec_minmax(table, write, buffer, length, ppos); |
1da177e4 LT |
6997 | setup_per_zone_lowmem_reserve(); |
6998 | return 0; | |
6999 | } | |
7000 | ||
8ad4b1fb RS |
7001 | /* |
7002 | * percpu_pagelist_fraction - changes the pcp->high for each zone on each | |
b8af2941 PK |
7003 | * cpu. It is the fraction of total pages in each zone that a hot per cpu |
7004 | * pagelist can have before it gets flushed back to buddy allocator. | |
8ad4b1fb | 7005 | */ |
cccad5b9 | 7006 | int percpu_pagelist_fraction_sysctl_handler(struct ctl_table *table, int write, |
8d65af78 | 7007 | void __user *buffer, size_t *length, loff_t *ppos) |
8ad4b1fb RS |
7008 | { |
7009 | struct zone *zone; | |
7cd2b0a3 | 7010 | int old_percpu_pagelist_fraction; |
8ad4b1fb RS |
7011 | int ret; |
7012 | ||
7cd2b0a3 DR |
7013 | mutex_lock(&pcp_batch_high_lock); |
7014 | old_percpu_pagelist_fraction = percpu_pagelist_fraction; | |
7015 | ||
8d65af78 | 7016 | ret = proc_dointvec_minmax(table, write, buffer, length, ppos); |
7cd2b0a3 DR |
7017 | if (!write || ret < 0) |
7018 | goto out; | |
7019 | ||
7020 | /* Sanity checking to avoid pcp imbalance */ | |
7021 | if (percpu_pagelist_fraction && | |
7022 | percpu_pagelist_fraction < MIN_PERCPU_PAGELIST_FRACTION) { | |
7023 | percpu_pagelist_fraction = old_percpu_pagelist_fraction; | |
7024 | ret = -EINVAL; | |
7025 | goto out; | |
7026 | } | |
7027 | ||
7028 | /* No change? */ | |
7029 | if (percpu_pagelist_fraction == old_percpu_pagelist_fraction) | |
7030 | goto out; | |
c8e251fa | 7031 | |
364df0eb | 7032 | for_each_populated_zone(zone) { |
7cd2b0a3 DR |
7033 | unsigned int cpu; |
7034 | ||
22a7f12b | 7035 | for_each_possible_cpu(cpu) |
7cd2b0a3 DR |
7036 | pageset_set_high_and_batch(zone, |
7037 | per_cpu_ptr(zone->pageset, cpu)); | |
8ad4b1fb | 7038 | } |
7cd2b0a3 | 7039 | out: |
c8e251fa | 7040 | mutex_unlock(&pcp_batch_high_lock); |
7cd2b0a3 | 7041 | return ret; |
8ad4b1fb RS |
7042 | } |
7043 | ||
a9919c79 | 7044 | #ifdef CONFIG_NUMA |
f034b5d4 | 7045 | int hashdist = HASHDIST_DEFAULT; |
1da177e4 | 7046 | |
1da177e4 LT |
7047 | static int __init set_hashdist(char *str) |
7048 | { | |
7049 | if (!str) | |
7050 | return 0; | |
7051 | hashdist = simple_strtoul(str, &str, 0); | |
7052 | return 1; | |
7053 | } | |
7054 | __setup("hashdist=", set_hashdist); | |
7055 | #endif | |
7056 | ||
7057 | /* | |
7058 | * allocate a large system hash table from bootmem | |
7059 | * - it is assumed that the hash table must contain an exact power-of-2 | |
7060 | * quantity of entries | |
7061 | * - limit is the number of hash buckets, not the total allocation size | |
7062 | */ | |
7063 | void *__init alloc_large_system_hash(const char *tablename, | |
7064 | unsigned long bucketsize, | |
7065 | unsigned long numentries, | |
7066 | int scale, | |
7067 | int flags, | |
7068 | unsigned int *_hash_shift, | |
7069 | unsigned int *_hash_mask, | |
31fe62b9 TB |
7070 | unsigned long low_limit, |
7071 | unsigned long high_limit) | |
1da177e4 | 7072 | { |
31fe62b9 | 7073 | unsigned long long max = high_limit; |
1da177e4 LT |
7074 | unsigned long log2qty, size; |
7075 | void *table = NULL; | |
7076 | ||
7077 | /* allow the kernel cmdline to have a say */ | |
7078 | if (!numentries) { | |
7079 | /* round applicable memory size up to nearest megabyte */ | |
04903664 | 7080 | numentries = nr_kernel_pages; |
a7e83318 JZ |
7081 | |
7082 | /* It isn't necessary when PAGE_SIZE >= 1MB */ | |
7083 | if (PAGE_SHIFT < 20) | |
7084 | numentries = round_up(numentries, (1<<20)/PAGE_SIZE); | |
1da177e4 LT |
7085 | |
7086 | /* limit to 1 bucket per 2^scale bytes of low memory */ | |
7087 | if (scale > PAGE_SHIFT) | |
7088 | numentries >>= (scale - PAGE_SHIFT); | |
7089 | else | |
7090 | numentries <<= (PAGE_SHIFT - scale); | |
9ab37b8f PM |
7091 | |
7092 | /* Make sure we've got at least a 0-order allocation.. */ | |
2c85f51d JB |
7093 | if (unlikely(flags & HASH_SMALL)) { |
7094 | /* Makes no sense without HASH_EARLY */ | |
7095 | WARN_ON(!(flags & HASH_EARLY)); | |
7096 | if (!(numentries >> *_hash_shift)) { | |
7097 | numentries = 1UL << *_hash_shift; | |
7098 | BUG_ON(!numentries); | |
7099 | } | |
7100 | } else if (unlikely((numentries * bucketsize) < PAGE_SIZE)) | |
9ab37b8f | 7101 | numentries = PAGE_SIZE / bucketsize; |
1da177e4 | 7102 | } |
6e692ed3 | 7103 | numentries = roundup_pow_of_two(numentries); |
1da177e4 LT |
7104 | |
7105 | /* limit allocation size to 1/16 total memory by default */ | |
7106 | if (max == 0) { | |
7107 | max = ((unsigned long long)nr_all_pages << PAGE_SHIFT) >> 4; | |
7108 | do_div(max, bucketsize); | |
7109 | } | |
074b8517 | 7110 | max = min(max, 0x80000000ULL); |
1da177e4 | 7111 | |
31fe62b9 TB |
7112 | if (numentries < low_limit) |
7113 | numentries = low_limit; | |
1da177e4 LT |
7114 | if (numentries > max) |
7115 | numentries = max; | |
7116 | ||
f0d1b0b3 | 7117 | log2qty = ilog2(numentries); |
1da177e4 LT |
7118 | |
7119 | do { | |
7120 | size = bucketsize << log2qty; | |
7121 | if (flags & HASH_EARLY) | |
6782832e | 7122 | table = memblock_virt_alloc_nopanic(size, 0); |
1da177e4 LT |
7123 | else if (hashdist) |
7124 | table = __vmalloc(size, GFP_ATOMIC, PAGE_KERNEL); | |
7125 | else { | |
1037b83b ED |
7126 | /* |
7127 | * If bucketsize is not a power-of-two, we may free | |
a1dd268c MG |
7128 | * some pages at the end of hash table which |
7129 | * alloc_pages_exact() automatically does | |
1037b83b | 7130 | */ |
264ef8a9 | 7131 | if (get_order(size) < MAX_ORDER) { |
a1dd268c | 7132 | table = alloc_pages_exact(size, GFP_ATOMIC); |
264ef8a9 CM |
7133 | kmemleak_alloc(table, size, 1, GFP_ATOMIC); |
7134 | } | |
1da177e4 LT |
7135 | } |
7136 | } while (!table && size > PAGE_SIZE && --log2qty); | |
7137 | ||
7138 | if (!table) | |
7139 | panic("Failed to allocate %s hash table\n", tablename); | |
7140 | ||
1170532b JP |
7141 | pr_info("%s hash table entries: %ld (order: %d, %lu bytes)\n", |
7142 | tablename, 1UL << log2qty, ilog2(size) - PAGE_SHIFT, size); | |
1da177e4 LT |
7143 | |
7144 | if (_hash_shift) | |
7145 | *_hash_shift = log2qty; | |
7146 | if (_hash_mask) | |
7147 | *_hash_mask = (1 << log2qty) - 1; | |
7148 | ||
7149 | return table; | |
7150 | } | |
a117e66e | 7151 | |
a5d76b54 | 7152 | /* |
80934513 MK |
7153 | * This function checks whether pageblock includes unmovable pages or not. |
7154 | * If @count is not zero, it is okay to include less @count unmovable pages | |
7155 | * | |
b8af2941 | 7156 | * PageLRU check without isolation or lru_lock could race so that |
80934513 MK |
7157 | * MIGRATE_MOVABLE block might include unmovable pages. It means you can't |
7158 | * expect this function should be exact. | |
a5d76b54 | 7159 | */ |
b023f468 WC |
7160 | bool has_unmovable_pages(struct zone *zone, struct page *page, int count, |
7161 | bool skip_hwpoisoned_pages) | |
49ac8255 KH |
7162 | { |
7163 | unsigned long pfn, iter, found; | |
47118af0 MN |
7164 | int mt; |
7165 | ||
49ac8255 KH |
7166 | /* |
7167 | * For avoiding noise data, lru_add_drain_all() should be called | |
80934513 | 7168 | * If ZONE_MOVABLE, the zone never contains unmovable pages |
49ac8255 KH |
7169 | */ |
7170 | if (zone_idx(zone) == ZONE_MOVABLE) | |
80934513 | 7171 | return false; |
47118af0 MN |
7172 | mt = get_pageblock_migratetype(page); |
7173 | if (mt == MIGRATE_MOVABLE || is_migrate_cma(mt)) | |
80934513 | 7174 | return false; |
49ac8255 KH |
7175 | |
7176 | pfn = page_to_pfn(page); | |
7177 | for (found = 0, iter = 0; iter < pageblock_nr_pages; iter++) { | |
7178 | unsigned long check = pfn + iter; | |
7179 | ||
29723fcc | 7180 | if (!pfn_valid_within(check)) |
49ac8255 | 7181 | continue; |
29723fcc | 7182 | |
49ac8255 | 7183 | page = pfn_to_page(check); |
c8721bbb NH |
7184 | |
7185 | /* | |
7186 | * Hugepages are not in LRU lists, but they're movable. | |
7187 | * We need not scan over tail pages bacause we don't | |
7188 | * handle each tail page individually in migration. | |
7189 | */ | |
7190 | if (PageHuge(page)) { | |
7191 | iter = round_up(iter + 1, 1<<compound_order(page)) - 1; | |
7192 | continue; | |
7193 | } | |
7194 | ||
97d255c8 MK |
7195 | /* |
7196 | * We can't use page_count without pin a page | |
7197 | * because another CPU can free compound page. | |
7198 | * This check already skips compound tails of THP | |
0139aa7b | 7199 | * because their page->_refcount is zero at all time. |
97d255c8 | 7200 | */ |
fe896d18 | 7201 | if (!page_ref_count(page)) { |
49ac8255 KH |
7202 | if (PageBuddy(page)) |
7203 | iter += (1 << page_order(page)) - 1; | |
7204 | continue; | |
7205 | } | |
97d255c8 | 7206 | |
b023f468 WC |
7207 | /* |
7208 | * The HWPoisoned page may be not in buddy system, and | |
7209 | * page_count() is not 0. | |
7210 | */ | |
7211 | if (skip_hwpoisoned_pages && PageHWPoison(page)) | |
7212 | continue; | |
7213 | ||
49ac8255 KH |
7214 | if (!PageLRU(page)) |
7215 | found++; | |
7216 | /* | |
6b4f7799 JW |
7217 | * If there are RECLAIMABLE pages, we need to check |
7218 | * it. But now, memory offline itself doesn't call | |
7219 | * shrink_node_slabs() and it still to be fixed. | |
49ac8255 KH |
7220 | */ |
7221 | /* | |
7222 | * If the page is not RAM, page_count()should be 0. | |
7223 | * we don't need more check. This is an _used_ not-movable page. | |
7224 | * | |
7225 | * The problematic thing here is PG_reserved pages. PG_reserved | |
7226 | * is set to both of a memory hole page and a _used_ kernel | |
7227 | * page at boot. | |
7228 | */ | |
7229 | if (found > count) | |
80934513 | 7230 | return true; |
49ac8255 | 7231 | } |
80934513 | 7232 | return false; |
49ac8255 KH |
7233 | } |
7234 | ||
7235 | bool is_pageblock_removable_nolock(struct page *page) | |
7236 | { | |
656a0706 MH |
7237 | struct zone *zone; |
7238 | unsigned long pfn; | |
687875fb MH |
7239 | |
7240 | /* | |
7241 | * We have to be careful here because we are iterating over memory | |
7242 | * sections which are not zone aware so we might end up outside of | |
7243 | * the zone but still within the section. | |
656a0706 MH |
7244 | * We have to take care about the node as well. If the node is offline |
7245 | * its NODE_DATA will be NULL - see page_zone. | |
687875fb | 7246 | */ |
656a0706 MH |
7247 | if (!node_online(page_to_nid(page))) |
7248 | return false; | |
7249 | ||
7250 | zone = page_zone(page); | |
7251 | pfn = page_to_pfn(page); | |
108bcc96 | 7252 | if (!zone_spans_pfn(zone, pfn)) |
687875fb MH |
7253 | return false; |
7254 | ||
b023f468 | 7255 | return !has_unmovable_pages(zone, page, 0, true); |
a5d76b54 | 7256 | } |
0c0e6195 | 7257 | |
080fe206 | 7258 | #if (defined(CONFIG_MEMORY_ISOLATION) && defined(CONFIG_COMPACTION)) || defined(CONFIG_CMA) |
041d3a8c MN |
7259 | |
7260 | static unsigned long pfn_max_align_down(unsigned long pfn) | |
7261 | { | |
7262 | return pfn & ~(max_t(unsigned long, MAX_ORDER_NR_PAGES, | |
7263 | pageblock_nr_pages) - 1); | |
7264 | } | |
7265 | ||
7266 | static unsigned long pfn_max_align_up(unsigned long pfn) | |
7267 | { | |
7268 | return ALIGN(pfn, max_t(unsigned long, MAX_ORDER_NR_PAGES, | |
7269 | pageblock_nr_pages)); | |
7270 | } | |
7271 | ||
041d3a8c | 7272 | /* [start, end) must belong to a single zone. */ |
bb13ffeb MG |
7273 | static int __alloc_contig_migrate_range(struct compact_control *cc, |
7274 | unsigned long start, unsigned long end) | |
041d3a8c MN |
7275 | { |
7276 | /* This function is based on compact_zone() from compaction.c. */ | |
beb51eaa | 7277 | unsigned long nr_reclaimed; |
041d3a8c MN |
7278 | unsigned long pfn = start; |
7279 | unsigned int tries = 0; | |
7280 | int ret = 0; | |
7281 | ||
be49a6e1 | 7282 | migrate_prep(); |
041d3a8c | 7283 | |
bb13ffeb | 7284 | while (pfn < end || !list_empty(&cc->migratepages)) { |
041d3a8c MN |
7285 | if (fatal_signal_pending(current)) { |
7286 | ret = -EINTR; | |
7287 | break; | |
7288 | } | |
7289 | ||
bb13ffeb MG |
7290 | if (list_empty(&cc->migratepages)) { |
7291 | cc->nr_migratepages = 0; | |
edc2ca61 | 7292 | pfn = isolate_migratepages_range(cc, pfn, end); |
041d3a8c MN |
7293 | if (!pfn) { |
7294 | ret = -EINTR; | |
7295 | break; | |
7296 | } | |
7297 | tries = 0; | |
7298 | } else if (++tries == 5) { | |
7299 | ret = ret < 0 ? ret : -EBUSY; | |
7300 | break; | |
7301 | } | |
7302 | ||
beb51eaa MK |
7303 | nr_reclaimed = reclaim_clean_pages_from_list(cc->zone, |
7304 | &cc->migratepages); | |
7305 | cc->nr_migratepages -= nr_reclaimed; | |
02c6de8d | 7306 | |
9c620e2b | 7307 | ret = migrate_pages(&cc->migratepages, alloc_migrate_target, |
e0b9daeb | 7308 | NULL, 0, cc->mode, MR_CMA); |
041d3a8c | 7309 | } |
2a6f5124 SP |
7310 | if (ret < 0) { |
7311 | putback_movable_pages(&cc->migratepages); | |
7312 | return ret; | |
7313 | } | |
7314 | return 0; | |
041d3a8c MN |
7315 | } |
7316 | ||
7317 | /** | |
7318 | * alloc_contig_range() -- tries to allocate given range of pages | |
7319 | * @start: start PFN to allocate | |
7320 | * @end: one-past-the-last PFN to allocate | |
0815f3d8 MN |
7321 | * @migratetype: migratetype of the underlaying pageblocks (either |
7322 | * #MIGRATE_MOVABLE or #MIGRATE_CMA). All pageblocks | |
7323 | * in range must have the same migratetype and it must | |
7324 | * be either of the two. | |
041d3a8c MN |
7325 | * |
7326 | * The PFN range does not have to be pageblock or MAX_ORDER_NR_PAGES | |
7327 | * aligned, however it's the caller's responsibility to guarantee that | |
7328 | * we are the only thread that changes migrate type of pageblocks the | |
7329 | * pages fall in. | |
7330 | * | |
7331 | * The PFN range must belong to a single zone. | |
7332 | * | |
7333 | * Returns zero on success or negative error code. On success all | |
7334 | * pages which PFN is in [start, end) are allocated for the caller and | |
7335 | * need to be freed with free_contig_range(). | |
7336 | */ | |
0815f3d8 MN |
7337 | int alloc_contig_range(unsigned long start, unsigned long end, |
7338 | unsigned migratetype) | |
041d3a8c | 7339 | { |
041d3a8c | 7340 | unsigned long outer_start, outer_end; |
d00181b9 KS |
7341 | unsigned int order; |
7342 | int ret = 0; | |
041d3a8c | 7343 | |
bb13ffeb MG |
7344 | struct compact_control cc = { |
7345 | .nr_migratepages = 0, | |
7346 | .order = -1, | |
7347 | .zone = page_zone(pfn_to_page(start)), | |
e0b9daeb | 7348 | .mode = MIGRATE_SYNC, |
bb13ffeb MG |
7349 | .ignore_skip_hint = true, |
7350 | }; | |
7351 | INIT_LIST_HEAD(&cc.migratepages); | |
7352 | ||
041d3a8c MN |
7353 | /* |
7354 | * What we do here is we mark all pageblocks in range as | |
7355 | * MIGRATE_ISOLATE. Because pageblock and max order pages may | |
7356 | * have different sizes, and due to the way page allocator | |
7357 | * work, we align the range to biggest of the two pages so | |
7358 | * that page allocator won't try to merge buddies from | |
7359 | * different pageblocks and change MIGRATE_ISOLATE to some | |
7360 | * other migration type. | |
7361 | * | |
7362 | * Once the pageblocks are marked as MIGRATE_ISOLATE, we | |
7363 | * migrate the pages from an unaligned range (ie. pages that | |
7364 | * we are interested in). This will put all the pages in | |
7365 | * range back to page allocator as MIGRATE_ISOLATE. | |
7366 | * | |
7367 | * When this is done, we take the pages in range from page | |
7368 | * allocator removing them from the buddy system. This way | |
7369 | * page allocator will never consider using them. | |
7370 | * | |
7371 | * This lets us mark the pageblocks back as | |
7372 | * MIGRATE_CMA/MIGRATE_MOVABLE so that free pages in the | |
7373 | * aligned range but not in the unaligned, original range are | |
7374 | * put back to page allocator so that buddy can use them. | |
7375 | */ | |
7376 | ||
7377 | ret = start_isolate_page_range(pfn_max_align_down(start), | |
b023f468 WC |
7378 | pfn_max_align_up(end), migratetype, |
7379 | false); | |
041d3a8c | 7380 | if (ret) |
86a595f9 | 7381 | return ret; |
041d3a8c | 7382 | |
8ef5849f JK |
7383 | /* |
7384 | * In case of -EBUSY, we'd like to know which page causes problem. | |
7385 | * So, just fall through. We will check it in test_pages_isolated(). | |
7386 | */ | |
bb13ffeb | 7387 | ret = __alloc_contig_migrate_range(&cc, start, end); |
8ef5849f | 7388 | if (ret && ret != -EBUSY) |
041d3a8c MN |
7389 | goto done; |
7390 | ||
7391 | /* | |
7392 | * Pages from [start, end) are within a MAX_ORDER_NR_PAGES | |
7393 | * aligned blocks that are marked as MIGRATE_ISOLATE. What's | |
7394 | * more, all pages in [start, end) are free in page allocator. | |
7395 | * What we are going to do is to allocate all pages from | |
7396 | * [start, end) (that is remove them from page allocator). | |
7397 | * | |
7398 | * The only problem is that pages at the beginning and at the | |
7399 | * end of interesting range may be not aligned with pages that | |
7400 | * page allocator holds, ie. they can be part of higher order | |
7401 | * pages. Because of this, we reserve the bigger range and | |
7402 | * once this is done free the pages we are not interested in. | |
7403 | * | |
7404 | * We don't have to hold zone->lock here because the pages are | |
7405 | * isolated thus they won't get removed from buddy. | |
7406 | */ | |
7407 | ||
7408 | lru_add_drain_all(); | |
510f5507 | 7409 | drain_all_pages(cc.zone); |
041d3a8c MN |
7410 | |
7411 | order = 0; | |
7412 | outer_start = start; | |
7413 | while (!PageBuddy(pfn_to_page(outer_start))) { | |
7414 | if (++order >= MAX_ORDER) { | |
8ef5849f JK |
7415 | outer_start = start; |
7416 | break; | |
041d3a8c MN |
7417 | } |
7418 | outer_start &= ~0UL << order; | |
7419 | } | |
7420 | ||
8ef5849f JK |
7421 | if (outer_start != start) { |
7422 | order = page_order(pfn_to_page(outer_start)); | |
7423 | ||
7424 | /* | |
7425 | * outer_start page could be small order buddy page and | |
7426 | * it doesn't include start page. Adjust outer_start | |
7427 | * in this case to report failed page properly | |
7428 | * on tracepoint in test_pages_isolated() | |
7429 | */ | |
7430 | if (outer_start + (1UL << order) <= start) | |
7431 | outer_start = start; | |
7432 | } | |
7433 | ||
041d3a8c | 7434 | /* Make sure the range is really isolated. */ |
b023f468 | 7435 | if (test_pages_isolated(outer_start, end, false)) { |
dae803e1 MN |
7436 | pr_info("%s: [%lx, %lx) PFNs busy\n", |
7437 | __func__, outer_start, end); | |
041d3a8c MN |
7438 | ret = -EBUSY; |
7439 | goto done; | |
7440 | } | |
7441 | ||
49f223a9 | 7442 | /* Grab isolated pages from freelists. */ |
bb13ffeb | 7443 | outer_end = isolate_freepages_range(&cc, outer_start, end); |
041d3a8c MN |
7444 | if (!outer_end) { |
7445 | ret = -EBUSY; | |
7446 | goto done; | |
7447 | } | |
7448 | ||
7449 | /* Free head and tail (if any) */ | |
7450 | if (start != outer_start) | |
7451 | free_contig_range(outer_start, start - outer_start); | |
7452 | if (end != outer_end) | |
7453 | free_contig_range(end, outer_end - end); | |
7454 | ||
7455 | done: | |
7456 | undo_isolate_page_range(pfn_max_align_down(start), | |
0815f3d8 | 7457 | pfn_max_align_up(end), migratetype); |
041d3a8c MN |
7458 | return ret; |
7459 | } | |
7460 | ||
7461 | void free_contig_range(unsigned long pfn, unsigned nr_pages) | |
7462 | { | |
bcc2b02f MS |
7463 | unsigned int count = 0; |
7464 | ||
7465 | for (; nr_pages--; pfn++) { | |
7466 | struct page *page = pfn_to_page(pfn); | |
7467 | ||
7468 | count += page_count(page) != 1; | |
7469 | __free_page(page); | |
7470 | } | |
7471 | WARN(count != 0, "%d pages are still in use!\n", count); | |
041d3a8c MN |
7472 | } |
7473 | #endif | |
7474 | ||
4ed7e022 | 7475 | #ifdef CONFIG_MEMORY_HOTPLUG |
0a647f38 CS |
7476 | /* |
7477 | * The zone indicated has a new number of managed_pages; batch sizes and percpu | |
7478 | * page high values need to be recalulated. | |
7479 | */ | |
4ed7e022 JL |
7480 | void __meminit zone_pcp_update(struct zone *zone) |
7481 | { | |
0a647f38 | 7482 | unsigned cpu; |
c8e251fa | 7483 | mutex_lock(&pcp_batch_high_lock); |
0a647f38 | 7484 | for_each_possible_cpu(cpu) |
169f6c19 CS |
7485 | pageset_set_high_and_batch(zone, |
7486 | per_cpu_ptr(zone->pageset, cpu)); | |
c8e251fa | 7487 | mutex_unlock(&pcp_batch_high_lock); |
4ed7e022 JL |
7488 | } |
7489 | #endif | |
7490 | ||
340175b7 JL |
7491 | void zone_pcp_reset(struct zone *zone) |
7492 | { | |
7493 | unsigned long flags; | |
5a883813 MK |
7494 | int cpu; |
7495 | struct per_cpu_pageset *pset; | |
340175b7 JL |
7496 | |
7497 | /* avoid races with drain_pages() */ | |
7498 | local_irq_save(flags); | |
7499 | if (zone->pageset != &boot_pageset) { | |
5a883813 MK |
7500 | for_each_online_cpu(cpu) { |
7501 | pset = per_cpu_ptr(zone->pageset, cpu); | |
7502 | drain_zonestat(zone, pset); | |
7503 | } | |
340175b7 JL |
7504 | free_percpu(zone->pageset); |
7505 | zone->pageset = &boot_pageset; | |
7506 | } | |
7507 | local_irq_restore(flags); | |
7508 | } | |
7509 | ||
6dcd73d7 | 7510 | #ifdef CONFIG_MEMORY_HOTREMOVE |
0c0e6195 | 7511 | /* |
b9eb6319 JK |
7512 | * All pages in the range must be in a single zone and isolated |
7513 | * before calling this. | |
0c0e6195 KH |
7514 | */ |
7515 | void | |
7516 | __offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn) | |
7517 | { | |
7518 | struct page *page; | |
7519 | struct zone *zone; | |
7aeb09f9 | 7520 | unsigned int order, i; |
0c0e6195 KH |
7521 | unsigned long pfn; |
7522 | unsigned long flags; | |
7523 | /* find the first valid pfn */ | |
7524 | for (pfn = start_pfn; pfn < end_pfn; pfn++) | |
7525 | if (pfn_valid(pfn)) | |
7526 | break; | |
7527 | if (pfn == end_pfn) | |
7528 | return; | |
7529 | zone = page_zone(pfn_to_page(pfn)); | |
7530 | spin_lock_irqsave(&zone->lock, flags); | |
7531 | pfn = start_pfn; | |
7532 | while (pfn < end_pfn) { | |
7533 | if (!pfn_valid(pfn)) { | |
7534 | pfn++; | |
7535 | continue; | |
7536 | } | |
7537 | page = pfn_to_page(pfn); | |
b023f468 WC |
7538 | /* |
7539 | * The HWPoisoned page may be not in buddy system, and | |
7540 | * page_count() is not 0. | |
7541 | */ | |
7542 | if (unlikely(!PageBuddy(page) && PageHWPoison(page))) { | |
7543 | pfn++; | |
7544 | SetPageReserved(page); | |
7545 | continue; | |
7546 | } | |
7547 | ||
0c0e6195 KH |
7548 | BUG_ON(page_count(page)); |
7549 | BUG_ON(!PageBuddy(page)); | |
7550 | order = page_order(page); | |
7551 | #ifdef CONFIG_DEBUG_VM | |
1170532b JP |
7552 | pr_info("remove from free list %lx %d %lx\n", |
7553 | pfn, 1 << order, end_pfn); | |
0c0e6195 KH |
7554 | #endif |
7555 | list_del(&page->lru); | |
7556 | rmv_page_order(page); | |
7557 | zone->free_area[order].nr_free--; | |
0c0e6195 KH |
7558 | for (i = 0; i < (1 << order); i++) |
7559 | SetPageReserved((page+i)); | |
7560 | pfn += (1 << order); | |
7561 | } | |
7562 | spin_unlock_irqrestore(&zone->lock, flags); | |
7563 | } | |
7564 | #endif | |
8d22ba1b | 7565 | |
8d22ba1b WF |
7566 | bool is_free_buddy_page(struct page *page) |
7567 | { | |
7568 | struct zone *zone = page_zone(page); | |
7569 | unsigned long pfn = page_to_pfn(page); | |
7570 | unsigned long flags; | |
7aeb09f9 | 7571 | unsigned int order; |
8d22ba1b WF |
7572 | |
7573 | spin_lock_irqsave(&zone->lock, flags); | |
7574 | for (order = 0; order < MAX_ORDER; order++) { | |
7575 | struct page *page_head = page - (pfn & ((1 << order) - 1)); | |
7576 | ||
7577 | if (PageBuddy(page_head) && page_order(page_head) >= order) | |
7578 | break; | |
7579 | } | |
7580 | spin_unlock_irqrestore(&zone->lock, flags); | |
7581 | ||
7582 | return order < MAX_ORDER; | |
7583 | } |