Commit | Line | Data |
---|---|---|
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> |
6811378e | 46 | #include <linux/stop_machine.h> |
c713216d MG |
47 | #include <linux/sort.h> |
48 | #include <linux/pfn.h> | |
3fcfab16 | 49 | #include <linux/backing-dev.h> |
933e312e | 50 | #include <linux/fault-inject.h> |
a5d76b54 | 51 | #include <linux/page-isolation.h> |
eefa864b | 52 | #include <linux/page_ext.h> |
3ac7fe5a | 53 | #include <linux/debugobjects.h> |
dbb1f81c | 54 | #include <linux/kmemleak.h> |
56de7263 | 55 | #include <linux/compaction.h> |
0d3d062a | 56 | #include <trace/events/kmem.h> |
268bb0ce | 57 | #include <linux/prefetch.h> |
6e543d57 | 58 | #include <linux/mm_inline.h> |
041d3a8c | 59 | #include <linux/migrate.h> |
e30825f1 | 60 | #include <linux/page_ext.h> |
949f7ec5 | 61 | #include <linux/hugetlb.h> |
8bd75c77 | 62 | #include <linux/sched/rt.h> |
48c96a36 | 63 | #include <linux/page_owner.h> |
0e1cc95b | 64 | #include <linux/kthread.h> |
1da177e4 | 65 | |
7ee3d4e8 | 66 | #include <asm/sections.h> |
1da177e4 | 67 | #include <asm/tlbflush.h> |
ac924c60 | 68 | #include <asm/div64.h> |
1da177e4 LT |
69 | #include "internal.h" |
70 | ||
c8e251fa CS |
71 | /* prevent >1 _updater_ of zone percpu pageset ->high and ->batch fields */ |
72 | static DEFINE_MUTEX(pcp_batch_high_lock); | |
7cd2b0a3 | 73 | #define MIN_PERCPU_PAGELIST_FRACTION (8) |
c8e251fa | 74 | |
72812019 LS |
75 | #ifdef CONFIG_USE_PERCPU_NUMA_NODE_ID |
76 | DEFINE_PER_CPU(int, numa_node); | |
77 | EXPORT_PER_CPU_SYMBOL(numa_node); | |
78 | #endif | |
79 | ||
7aac7898 LS |
80 | #ifdef CONFIG_HAVE_MEMORYLESS_NODES |
81 | /* | |
82 | * N.B., Do NOT reference the '_numa_mem_' per cpu variable directly. | |
83 | * It will not be defined when CONFIG_HAVE_MEMORYLESS_NODES is not defined. | |
84 | * Use the accessor functions set_numa_mem(), numa_mem_id() and cpu_to_mem() | |
85 | * defined in <linux/topology.h>. | |
86 | */ | |
87 | DEFINE_PER_CPU(int, _numa_mem_); /* Kernel "local memory" node */ | |
88 | EXPORT_PER_CPU_SYMBOL(_numa_mem_); | |
ad2c8144 | 89 | int _node_numa_mem_[MAX_NUMNODES]; |
7aac7898 LS |
90 | #endif |
91 | ||
1da177e4 | 92 | /* |
13808910 | 93 | * Array of node states. |
1da177e4 | 94 | */ |
13808910 CL |
95 | nodemask_t node_states[NR_NODE_STATES] __read_mostly = { |
96 | [N_POSSIBLE] = NODE_MASK_ALL, | |
97 | [N_ONLINE] = { { [0] = 1UL } }, | |
98 | #ifndef CONFIG_NUMA | |
99 | [N_NORMAL_MEMORY] = { { [0] = 1UL } }, | |
100 | #ifdef CONFIG_HIGHMEM | |
101 | [N_HIGH_MEMORY] = { { [0] = 1UL } }, | |
20b2f52b LJ |
102 | #endif |
103 | #ifdef CONFIG_MOVABLE_NODE | |
104 | [N_MEMORY] = { { [0] = 1UL } }, | |
13808910 CL |
105 | #endif |
106 | [N_CPU] = { { [0] = 1UL } }, | |
107 | #endif /* NUMA */ | |
108 | }; | |
109 | EXPORT_SYMBOL(node_states); | |
110 | ||
c3d5f5f0 JL |
111 | /* Protect totalram_pages and zone->managed_pages */ |
112 | static DEFINE_SPINLOCK(managed_page_count_lock); | |
113 | ||
6c231b7b | 114 | unsigned long totalram_pages __read_mostly; |
cb45b0e9 | 115 | unsigned long totalreserve_pages __read_mostly; |
e48322ab | 116 | unsigned long totalcma_pages __read_mostly; |
ab8fabd4 JW |
117 | /* |
118 | * When calculating the number of globally allowed dirty pages, there | |
119 | * is a certain number of per-zone reserves that should not be | |
120 | * considered dirtyable memory. This is the sum of those reserves | |
121 | * over all existing zones that contribute dirtyable memory. | |
122 | */ | |
123 | unsigned long dirty_balance_reserve __read_mostly; | |
124 | ||
1b76b02f | 125 | int percpu_pagelist_fraction; |
dcce284a | 126 | gfp_t gfp_allowed_mask __read_mostly = GFP_BOOT_MASK; |
1da177e4 | 127 | |
bb14c2c7 VB |
128 | /* |
129 | * A cached value of the page's pageblock's migratetype, used when the page is | |
130 | * put on a pcplist. Used to avoid the pageblock migratetype lookup when | |
131 | * freeing from pcplists in most cases, at the cost of possibly becoming stale. | |
132 | * Also the migratetype set in the page does not necessarily match the pcplist | |
133 | * index, e.g. page might have MIGRATE_CMA set but be on a pcplist with any | |
134 | * other index - this ensures that it will be put on the correct CMA freelist. | |
135 | */ | |
136 | static inline int get_pcppage_migratetype(struct page *page) | |
137 | { | |
138 | return page->index; | |
139 | } | |
140 | ||
141 | static inline void set_pcppage_migratetype(struct page *page, int migratetype) | |
142 | { | |
143 | page->index = migratetype; | |
144 | } | |
145 | ||
452aa699 RW |
146 | #ifdef CONFIG_PM_SLEEP |
147 | /* | |
148 | * The following functions are used by the suspend/hibernate code to temporarily | |
149 | * change gfp_allowed_mask in order to avoid using I/O during memory allocations | |
150 | * while devices are suspended. To avoid races with the suspend/hibernate code, | |
151 | * they should always be called with pm_mutex held (gfp_allowed_mask also should | |
152 | * only be modified with pm_mutex held, unless the suspend/hibernate code is | |
153 | * guaranteed not to run in parallel with that modification). | |
154 | */ | |
c9e664f1 RW |
155 | |
156 | static gfp_t saved_gfp_mask; | |
157 | ||
158 | void pm_restore_gfp_mask(void) | |
452aa699 RW |
159 | { |
160 | WARN_ON(!mutex_is_locked(&pm_mutex)); | |
c9e664f1 RW |
161 | if (saved_gfp_mask) { |
162 | gfp_allowed_mask = saved_gfp_mask; | |
163 | saved_gfp_mask = 0; | |
164 | } | |
452aa699 RW |
165 | } |
166 | ||
c9e664f1 | 167 | void pm_restrict_gfp_mask(void) |
452aa699 | 168 | { |
452aa699 | 169 | WARN_ON(!mutex_is_locked(&pm_mutex)); |
c9e664f1 RW |
170 | WARN_ON(saved_gfp_mask); |
171 | saved_gfp_mask = gfp_allowed_mask; | |
d0164adc | 172 | gfp_allowed_mask &= ~(__GFP_IO | __GFP_FS); |
452aa699 | 173 | } |
f90ac398 MG |
174 | |
175 | bool pm_suspended_storage(void) | |
176 | { | |
d0164adc | 177 | if ((gfp_allowed_mask & (__GFP_IO | __GFP_FS)) == (__GFP_IO | __GFP_FS)) |
f90ac398 MG |
178 | return false; |
179 | return true; | |
180 | } | |
452aa699 RW |
181 | #endif /* CONFIG_PM_SLEEP */ |
182 | ||
d9c23400 | 183 | #ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE |
d00181b9 | 184 | unsigned int pageblock_order __read_mostly; |
d9c23400 MG |
185 | #endif |
186 | ||
d98c7a09 | 187 | static void __free_pages_ok(struct page *page, unsigned int order); |
a226f6c8 | 188 | |
1da177e4 LT |
189 | /* |
190 | * results with 256, 32 in the lowmem_reserve sysctl: | |
191 | * 1G machine -> (16M dma, 800M-16M normal, 1G-800M high) | |
192 | * 1G machine -> (16M dma, 784M normal, 224M high) | |
193 | * NORMAL allocation will leave 784M/256 of ram reserved in the ZONE_DMA | |
194 | * HIGHMEM allocation will leave 224M/32 of ram reserved in ZONE_NORMAL | |
84109e15 | 195 | * HIGHMEM allocation will leave (224M+784M)/256 of ram reserved in ZONE_DMA |
a2f1b424 AK |
196 | * |
197 | * TBD: should special case ZONE_DMA32 machines here - in those we normally | |
198 | * don't need any ZONE_NORMAL reservation | |
1da177e4 | 199 | */ |
2f1b6248 | 200 | int sysctl_lowmem_reserve_ratio[MAX_NR_ZONES-1] = { |
4b51d669 | 201 | #ifdef CONFIG_ZONE_DMA |
2f1b6248 | 202 | 256, |
4b51d669 | 203 | #endif |
fb0e7942 | 204 | #ifdef CONFIG_ZONE_DMA32 |
2f1b6248 | 205 | 256, |
fb0e7942 | 206 | #endif |
e53ef38d | 207 | #ifdef CONFIG_HIGHMEM |
2a1e274a | 208 | 32, |
e53ef38d | 209 | #endif |
2a1e274a | 210 | 32, |
2f1b6248 | 211 | }; |
1da177e4 LT |
212 | |
213 | EXPORT_SYMBOL(totalram_pages); | |
1da177e4 | 214 | |
15ad7cdc | 215 | static char * const zone_names[MAX_NR_ZONES] = { |
4b51d669 | 216 | #ifdef CONFIG_ZONE_DMA |
2f1b6248 | 217 | "DMA", |
4b51d669 | 218 | #endif |
fb0e7942 | 219 | #ifdef CONFIG_ZONE_DMA32 |
2f1b6248 | 220 | "DMA32", |
fb0e7942 | 221 | #endif |
2f1b6248 | 222 | "Normal", |
e53ef38d | 223 | #ifdef CONFIG_HIGHMEM |
2a1e274a | 224 | "HighMem", |
e53ef38d | 225 | #endif |
2a1e274a | 226 | "Movable", |
033fbae9 DW |
227 | #ifdef CONFIG_ZONE_DEVICE |
228 | "Device", | |
229 | #endif | |
2f1b6248 CL |
230 | }; |
231 | ||
f1e61557 KS |
232 | static void free_compound_page(struct page *page); |
233 | compound_page_dtor * const compound_page_dtors[] = { | |
234 | NULL, | |
235 | free_compound_page, | |
236 | #ifdef CONFIG_HUGETLB_PAGE | |
237 | free_huge_page, | |
238 | #endif | |
239 | }; | |
240 | ||
1da177e4 | 241 | int min_free_kbytes = 1024; |
42aa83cb | 242 | int user_min_free_kbytes = -1; |
1da177e4 | 243 | |
2c85f51d JB |
244 | static unsigned long __meminitdata nr_kernel_pages; |
245 | static unsigned long __meminitdata nr_all_pages; | |
a3142c8e | 246 | static unsigned long __meminitdata dma_reserve; |
1da177e4 | 247 | |
0ee332c1 TH |
248 | #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP |
249 | static unsigned long __meminitdata arch_zone_lowest_possible_pfn[MAX_NR_ZONES]; | |
250 | static unsigned long __meminitdata arch_zone_highest_possible_pfn[MAX_NR_ZONES]; | |
251 | static unsigned long __initdata required_kernelcore; | |
252 | static unsigned long __initdata required_movablecore; | |
253 | static unsigned long __meminitdata zone_movable_pfn[MAX_NUMNODES]; | |
254 | ||
255 | /* movable_zone is the "real" zone pages in ZONE_MOVABLE are taken from */ | |
256 | int movable_zone; | |
257 | EXPORT_SYMBOL(movable_zone); | |
258 | #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ | |
c713216d | 259 | |
418508c1 MS |
260 | #if MAX_NUMNODES > 1 |
261 | int nr_node_ids __read_mostly = MAX_NUMNODES; | |
62bc62a8 | 262 | int nr_online_nodes __read_mostly = 1; |
418508c1 | 263 | EXPORT_SYMBOL(nr_node_ids); |
62bc62a8 | 264 | EXPORT_SYMBOL(nr_online_nodes); |
418508c1 MS |
265 | #endif |
266 | ||
9ef9acb0 MG |
267 | int page_group_by_mobility_disabled __read_mostly; |
268 | ||
3a80a7fa MG |
269 | #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT |
270 | static inline void reset_deferred_meminit(pg_data_t *pgdat) | |
271 | { | |
272 | pgdat->first_deferred_pfn = ULONG_MAX; | |
273 | } | |
274 | ||
275 | /* Returns true if the struct page for the pfn is uninitialised */ | |
0e1cc95b | 276 | static inline bool __meminit early_page_uninitialised(unsigned long pfn) |
3a80a7fa | 277 | { |
ae026b2a | 278 | if (pfn >= NODE_DATA(early_pfn_to_nid(pfn))->first_deferred_pfn) |
3a80a7fa MG |
279 | return true; |
280 | ||
281 | return false; | |
282 | } | |
283 | ||
7e18adb4 MG |
284 | static inline bool early_page_nid_uninitialised(unsigned long pfn, int nid) |
285 | { | |
286 | if (pfn >= NODE_DATA(nid)->first_deferred_pfn) | |
287 | return true; | |
288 | ||
289 | return false; | |
290 | } | |
291 | ||
3a80a7fa MG |
292 | /* |
293 | * Returns false when the remaining initialisation should be deferred until | |
294 | * later in the boot cycle when it can be parallelised. | |
295 | */ | |
296 | static inline bool update_defer_init(pg_data_t *pgdat, | |
297 | unsigned long pfn, unsigned long zone_end, | |
298 | unsigned long *nr_initialised) | |
299 | { | |
300 | /* Always populate low zones for address-contrained allocations */ | |
301 | if (zone_end < pgdat_end_pfn(pgdat)) | |
302 | return true; | |
303 | ||
304 | /* Initialise at least 2G of the highest zone */ | |
305 | (*nr_initialised)++; | |
306 | if (*nr_initialised > (2UL << (30 - PAGE_SHIFT)) && | |
307 | (pfn & (PAGES_PER_SECTION - 1)) == 0) { | |
308 | pgdat->first_deferred_pfn = pfn; | |
309 | return false; | |
310 | } | |
311 | ||
312 | return true; | |
313 | } | |
314 | #else | |
315 | static inline void reset_deferred_meminit(pg_data_t *pgdat) | |
316 | { | |
317 | } | |
318 | ||
319 | static inline bool early_page_uninitialised(unsigned long pfn) | |
320 | { | |
321 | return false; | |
322 | } | |
323 | ||
7e18adb4 MG |
324 | static inline bool early_page_nid_uninitialised(unsigned long pfn, int nid) |
325 | { | |
326 | return false; | |
327 | } | |
328 | ||
3a80a7fa MG |
329 | static inline bool update_defer_init(pg_data_t *pgdat, |
330 | unsigned long pfn, unsigned long zone_end, | |
331 | unsigned long *nr_initialised) | |
332 | { | |
333 | return true; | |
334 | } | |
335 | #endif | |
336 | ||
337 | ||
ee6f509c | 338 | void set_pageblock_migratetype(struct page *page, int migratetype) |
b2a0ac88 | 339 | { |
5d0f3f72 KM |
340 | if (unlikely(page_group_by_mobility_disabled && |
341 | migratetype < MIGRATE_PCPTYPES)) | |
49255c61 MG |
342 | migratetype = MIGRATE_UNMOVABLE; |
343 | ||
b2a0ac88 MG |
344 | set_pageblock_flags_group(page, (unsigned long)migratetype, |
345 | PB_migrate, PB_migrate_end); | |
346 | } | |
347 | ||
13e7444b | 348 | #ifdef CONFIG_DEBUG_VM |
c6a57e19 | 349 | static int page_outside_zone_boundaries(struct zone *zone, struct page *page) |
1da177e4 | 350 | { |
bdc8cb98 DH |
351 | int ret = 0; |
352 | unsigned seq; | |
353 | unsigned long pfn = page_to_pfn(page); | |
b5e6a5a2 | 354 | unsigned long sp, start_pfn; |
c6a57e19 | 355 | |
bdc8cb98 DH |
356 | do { |
357 | seq = zone_span_seqbegin(zone); | |
b5e6a5a2 CS |
358 | start_pfn = zone->zone_start_pfn; |
359 | sp = zone->spanned_pages; | |
108bcc96 | 360 | if (!zone_spans_pfn(zone, pfn)) |
bdc8cb98 DH |
361 | ret = 1; |
362 | } while (zone_span_seqretry(zone, seq)); | |
363 | ||
b5e6a5a2 | 364 | if (ret) |
613813e8 DH |
365 | pr_err("page 0x%lx outside node %d zone %s [ 0x%lx - 0x%lx ]\n", |
366 | pfn, zone_to_nid(zone), zone->name, | |
367 | start_pfn, start_pfn + sp); | |
b5e6a5a2 | 368 | |
bdc8cb98 | 369 | return ret; |
c6a57e19 DH |
370 | } |
371 | ||
372 | static int page_is_consistent(struct zone *zone, struct page *page) | |
373 | { | |
14e07298 | 374 | if (!pfn_valid_within(page_to_pfn(page))) |
c6a57e19 | 375 | return 0; |
1da177e4 | 376 | if (zone != page_zone(page)) |
c6a57e19 DH |
377 | return 0; |
378 | ||
379 | return 1; | |
380 | } | |
381 | /* | |
382 | * Temporary debugging check for pages not lying within a given zone. | |
383 | */ | |
384 | static int bad_range(struct zone *zone, struct page *page) | |
385 | { | |
386 | if (page_outside_zone_boundaries(zone, page)) | |
1da177e4 | 387 | return 1; |
c6a57e19 DH |
388 | if (!page_is_consistent(zone, page)) |
389 | return 1; | |
390 | ||
1da177e4 LT |
391 | return 0; |
392 | } | |
13e7444b NP |
393 | #else |
394 | static inline int bad_range(struct zone *zone, struct page *page) | |
395 | { | |
396 | return 0; | |
397 | } | |
398 | #endif | |
399 | ||
d230dec1 KS |
400 | static void bad_page(struct page *page, const char *reason, |
401 | unsigned long bad_flags) | |
1da177e4 | 402 | { |
d936cf9b HD |
403 | static unsigned long resume; |
404 | static unsigned long nr_shown; | |
405 | static unsigned long nr_unshown; | |
406 | ||
2a7684a2 WF |
407 | /* Don't complain about poisoned pages */ |
408 | if (PageHWPoison(page)) { | |
22b751c3 | 409 | page_mapcount_reset(page); /* remove PageBuddy */ |
2a7684a2 WF |
410 | return; |
411 | } | |
412 | ||
d936cf9b HD |
413 | /* |
414 | * Allow a burst of 60 reports, then keep quiet for that minute; | |
415 | * or allow a steady drip of one report per second. | |
416 | */ | |
417 | if (nr_shown == 60) { | |
418 | if (time_before(jiffies, resume)) { | |
419 | nr_unshown++; | |
420 | goto out; | |
421 | } | |
422 | if (nr_unshown) { | |
1e9e6365 HD |
423 | printk(KERN_ALERT |
424 | "BUG: Bad page state: %lu messages suppressed\n", | |
d936cf9b HD |
425 | nr_unshown); |
426 | nr_unshown = 0; | |
427 | } | |
428 | nr_shown = 0; | |
429 | } | |
430 | if (nr_shown++ == 0) | |
431 | resume = jiffies + 60 * HZ; | |
432 | ||
1e9e6365 | 433 | printk(KERN_ALERT "BUG: Bad page state in process %s pfn:%05lx\n", |
3dc14741 | 434 | current->comm, page_to_pfn(page)); |
f0b791a3 | 435 | dump_page_badflags(page, reason, bad_flags); |
3dc14741 | 436 | |
4f31888c | 437 | print_modules(); |
1da177e4 | 438 | dump_stack(); |
d936cf9b | 439 | out: |
8cc3b392 | 440 | /* Leave bad fields for debug, except PageBuddy could make trouble */ |
22b751c3 | 441 | page_mapcount_reset(page); /* remove PageBuddy */ |
373d4d09 | 442 | add_taint(TAINT_BAD_PAGE, LOCKDEP_NOW_UNRELIABLE); |
1da177e4 LT |
443 | } |
444 | ||
1da177e4 LT |
445 | /* |
446 | * Higher-order pages are called "compound pages". They are structured thusly: | |
447 | * | |
1d798ca3 | 448 | * The first PAGE_SIZE page is called the "head page" and have PG_head set. |
1da177e4 | 449 | * |
1d798ca3 KS |
450 | * The remaining PAGE_SIZE pages are called "tail pages". PageTail() is encoded |
451 | * in bit 0 of page->compound_head. The rest of bits is pointer to head page. | |
1da177e4 | 452 | * |
1d798ca3 KS |
453 | * The first tail page's ->compound_dtor holds the offset in array of compound |
454 | * page destructors. See compound_page_dtors. | |
1da177e4 | 455 | * |
1d798ca3 | 456 | * The first tail page's ->compound_order holds the order of allocation. |
41d78ba5 | 457 | * This usage means that zero-order pages may not be compound. |
1da177e4 | 458 | */ |
d98c7a09 HD |
459 | |
460 | static void free_compound_page(struct page *page) | |
461 | { | |
d85f3385 | 462 | __free_pages_ok(page, compound_order(page)); |
d98c7a09 HD |
463 | } |
464 | ||
d00181b9 | 465 | void prep_compound_page(struct page *page, unsigned int order) |
18229df5 AW |
466 | { |
467 | int i; | |
468 | int nr_pages = 1 << order; | |
469 | ||
f1e61557 | 470 | set_compound_page_dtor(page, COMPOUND_PAGE_DTOR); |
18229df5 AW |
471 | set_compound_order(page, order); |
472 | __SetPageHead(page); | |
473 | for (i = 1; i < nr_pages; i++) { | |
474 | struct page *p = page + i; | |
58a84aa9 | 475 | set_page_count(p, 0); |
1d798ca3 | 476 | set_compound_head(p, page); |
18229df5 AW |
477 | } |
478 | } | |
479 | ||
c0a32fc5 SG |
480 | #ifdef CONFIG_DEBUG_PAGEALLOC |
481 | unsigned int _debug_guardpage_minorder; | |
031bc574 | 482 | bool _debug_pagealloc_enabled __read_mostly; |
e30825f1 JK |
483 | bool _debug_guardpage_enabled __read_mostly; |
484 | ||
031bc574 JK |
485 | static int __init early_debug_pagealloc(char *buf) |
486 | { | |
487 | if (!buf) | |
488 | return -EINVAL; | |
489 | ||
490 | if (strcmp(buf, "on") == 0) | |
491 | _debug_pagealloc_enabled = true; | |
492 | ||
493 | return 0; | |
494 | } | |
495 | early_param("debug_pagealloc", early_debug_pagealloc); | |
496 | ||
e30825f1 JK |
497 | static bool need_debug_guardpage(void) |
498 | { | |
031bc574 JK |
499 | /* If we don't use debug_pagealloc, we don't need guard page */ |
500 | if (!debug_pagealloc_enabled()) | |
501 | return false; | |
502 | ||
e30825f1 JK |
503 | return true; |
504 | } | |
505 | ||
506 | static void init_debug_guardpage(void) | |
507 | { | |
031bc574 JK |
508 | if (!debug_pagealloc_enabled()) |
509 | return; | |
510 | ||
e30825f1 JK |
511 | _debug_guardpage_enabled = true; |
512 | } | |
513 | ||
514 | struct page_ext_operations debug_guardpage_ops = { | |
515 | .need = need_debug_guardpage, | |
516 | .init = init_debug_guardpage, | |
517 | }; | |
c0a32fc5 SG |
518 | |
519 | static int __init debug_guardpage_minorder_setup(char *buf) | |
520 | { | |
521 | unsigned long res; | |
522 | ||
523 | if (kstrtoul(buf, 10, &res) < 0 || res > MAX_ORDER / 2) { | |
524 | printk(KERN_ERR "Bad debug_guardpage_minorder value\n"); | |
525 | return 0; | |
526 | } | |
527 | _debug_guardpage_minorder = res; | |
528 | printk(KERN_INFO "Setting debug_guardpage_minorder to %lu\n", res); | |
529 | return 0; | |
530 | } | |
531 | __setup("debug_guardpage_minorder=", debug_guardpage_minorder_setup); | |
532 | ||
2847cf95 JK |
533 | static inline void set_page_guard(struct zone *zone, struct page *page, |
534 | unsigned int order, int migratetype) | |
c0a32fc5 | 535 | { |
e30825f1 JK |
536 | struct page_ext *page_ext; |
537 | ||
538 | if (!debug_guardpage_enabled()) | |
539 | return; | |
540 | ||
541 | page_ext = lookup_page_ext(page); | |
542 | __set_bit(PAGE_EXT_DEBUG_GUARD, &page_ext->flags); | |
543 | ||
2847cf95 JK |
544 | INIT_LIST_HEAD(&page->lru); |
545 | set_page_private(page, order); | |
546 | /* Guard pages are not available for any usage */ | |
547 | __mod_zone_freepage_state(zone, -(1 << order), migratetype); | |
c0a32fc5 SG |
548 | } |
549 | ||
2847cf95 JK |
550 | static inline void clear_page_guard(struct zone *zone, struct page *page, |
551 | unsigned int order, int migratetype) | |
c0a32fc5 | 552 | { |
e30825f1 JK |
553 | struct page_ext *page_ext; |
554 | ||
555 | if (!debug_guardpage_enabled()) | |
556 | return; | |
557 | ||
558 | page_ext = lookup_page_ext(page); | |
559 | __clear_bit(PAGE_EXT_DEBUG_GUARD, &page_ext->flags); | |
560 | ||
2847cf95 JK |
561 | set_page_private(page, 0); |
562 | if (!is_migrate_isolate(migratetype)) | |
563 | __mod_zone_freepage_state(zone, (1 << order), migratetype); | |
c0a32fc5 SG |
564 | } |
565 | #else | |
e30825f1 | 566 | struct page_ext_operations debug_guardpage_ops = { NULL, }; |
2847cf95 JK |
567 | static inline void set_page_guard(struct zone *zone, struct page *page, |
568 | unsigned int order, int migratetype) {} | |
569 | static inline void clear_page_guard(struct zone *zone, struct page *page, | |
570 | unsigned int order, int migratetype) {} | |
c0a32fc5 SG |
571 | #endif |
572 | ||
7aeb09f9 | 573 | static inline void set_page_order(struct page *page, unsigned int order) |
6aa3001b | 574 | { |
4c21e2f2 | 575 | set_page_private(page, order); |
676165a8 | 576 | __SetPageBuddy(page); |
1da177e4 LT |
577 | } |
578 | ||
579 | static inline void rmv_page_order(struct page *page) | |
580 | { | |
676165a8 | 581 | __ClearPageBuddy(page); |
4c21e2f2 | 582 | set_page_private(page, 0); |
1da177e4 LT |
583 | } |
584 | ||
1da177e4 LT |
585 | /* |
586 | * This function checks whether a page is free && is the buddy | |
587 | * we can do coalesce a page and its buddy if | |
13e7444b | 588 | * (a) the buddy is not in a hole && |
676165a8 | 589 | * (b) the buddy is in the buddy system && |
cb2b95e1 AW |
590 | * (c) a page and its buddy have the same order && |
591 | * (d) a page and its buddy are in the same zone. | |
676165a8 | 592 | * |
cf6fe945 WSH |
593 | * For recording whether a page is in the buddy system, we set ->_mapcount |
594 | * PAGE_BUDDY_MAPCOUNT_VALUE. | |
595 | * Setting, clearing, and testing _mapcount PAGE_BUDDY_MAPCOUNT_VALUE is | |
596 | * serialized by zone->lock. | |
1da177e4 | 597 | * |
676165a8 | 598 | * For recording page's order, we use page_private(page). |
1da177e4 | 599 | */ |
cb2b95e1 | 600 | static inline int page_is_buddy(struct page *page, struct page *buddy, |
7aeb09f9 | 601 | unsigned int order) |
1da177e4 | 602 | { |
14e07298 | 603 | if (!pfn_valid_within(page_to_pfn(buddy))) |
13e7444b | 604 | return 0; |
13e7444b | 605 | |
c0a32fc5 | 606 | if (page_is_guard(buddy) && page_order(buddy) == order) { |
d34c5fa0 MG |
607 | if (page_zone_id(page) != page_zone_id(buddy)) |
608 | return 0; | |
609 | ||
4c5018ce WY |
610 | VM_BUG_ON_PAGE(page_count(buddy) != 0, buddy); |
611 | ||
c0a32fc5 SG |
612 | return 1; |
613 | } | |
614 | ||
cb2b95e1 | 615 | if (PageBuddy(buddy) && page_order(buddy) == order) { |
d34c5fa0 MG |
616 | /* |
617 | * zone check is done late to avoid uselessly | |
618 | * calculating zone/node ids for pages that could | |
619 | * never merge. | |
620 | */ | |
621 | if (page_zone_id(page) != page_zone_id(buddy)) | |
622 | return 0; | |
623 | ||
4c5018ce WY |
624 | VM_BUG_ON_PAGE(page_count(buddy) != 0, buddy); |
625 | ||
6aa3001b | 626 | return 1; |
676165a8 | 627 | } |
6aa3001b | 628 | return 0; |
1da177e4 LT |
629 | } |
630 | ||
631 | /* | |
632 | * Freeing function for a buddy system allocator. | |
633 | * | |
634 | * The concept of a buddy system is to maintain direct-mapped table | |
635 | * (containing bit values) for memory blocks of various "orders". | |
636 | * The bottom level table contains the map for the smallest allocatable | |
637 | * units of memory (here, pages), and each level above it describes | |
638 | * pairs of units from the levels below, hence, "buddies". | |
639 | * At a high level, all that happens here is marking the table entry | |
640 | * at the bottom level available, and propagating the changes upward | |
641 | * as necessary, plus some accounting needed to play nicely with other | |
642 | * parts of the VM system. | |
643 | * At each level, we keep a list of pages, which are heads of continuous | |
cf6fe945 WSH |
644 | * free pages of length of (1 << order) and marked with _mapcount |
645 | * PAGE_BUDDY_MAPCOUNT_VALUE. Page's order is recorded in page_private(page) | |
646 | * field. | |
1da177e4 | 647 | * So when we are allocating or freeing one, we can derive the state of the |
5f63b720 MN |
648 | * other. That is, if we allocate a small block, and both were |
649 | * free, the remainder of the region must be split into blocks. | |
1da177e4 | 650 | * If a block is freed, and its buddy is also free, then this |
5f63b720 | 651 | * triggers coalescing into a block of larger size. |
1da177e4 | 652 | * |
6d49e352 | 653 | * -- nyc |
1da177e4 LT |
654 | */ |
655 | ||
48db57f8 | 656 | static inline void __free_one_page(struct page *page, |
dc4b0caf | 657 | unsigned long pfn, |
ed0ae21d MG |
658 | struct zone *zone, unsigned int order, |
659 | int migratetype) | |
1da177e4 LT |
660 | { |
661 | unsigned long page_idx; | |
6dda9d55 | 662 | unsigned long combined_idx; |
43506fad | 663 | unsigned long uninitialized_var(buddy_idx); |
6dda9d55 | 664 | struct page *buddy; |
d00181b9 | 665 | unsigned int max_order = MAX_ORDER; |
1da177e4 | 666 | |
d29bb978 | 667 | VM_BUG_ON(!zone_is_initialized(zone)); |
6e9f0d58 | 668 | VM_BUG_ON_PAGE(page->flags & PAGE_FLAGS_CHECK_AT_PREP, page); |
1da177e4 | 669 | |
ed0ae21d | 670 | VM_BUG_ON(migratetype == -1); |
3c605096 JK |
671 | if (is_migrate_isolate(migratetype)) { |
672 | /* | |
673 | * We restrict max order of merging to prevent merge | |
674 | * between freepages on isolate pageblock and normal | |
675 | * pageblock. Without this, pageblock isolation | |
676 | * could cause incorrect freepage accounting. | |
677 | */ | |
d00181b9 | 678 | max_order = min_t(unsigned int, MAX_ORDER, pageblock_order + 1); |
3c605096 | 679 | } else { |
8f82b55d | 680 | __mod_zone_freepage_state(zone, 1 << order, migratetype); |
3c605096 | 681 | } |
ed0ae21d | 682 | |
3c605096 | 683 | page_idx = pfn & ((1 << max_order) - 1); |
1da177e4 | 684 | |
309381fe SL |
685 | VM_BUG_ON_PAGE(page_idx & ((1 << order) - 1), page); |
686 | VM_BUG_ON_PAGE(bad_range(zone, page), page); | |
1da177e4 | 687 | |
3c605096 | 688 | while (order < max_order - 1) { |
43506fad KC |
689 | buddy_idx = __find_buddy_index(page_idx, order); |
690 | buddy = page + (buddy_idx - page_idx); | |
cb2b95e1 | 691 | if (!page_is_buddy(page, buddy, order)) |
3c82d0ce | 692 | break; |
c0a32fc5 SG |
693 | /* |
694 | * Our buddy is free or it is CONFIG_DEBUG_PAGEALLOC guard page, | |
695 | * merge with it and move up one order. | |
696 | */ | |
697 | if (page_is_guard(buddy)) { | |
2847cf95 | 698 | clear_page_guard(zone, buddy, order, migratetype); |
c0a32fc5 SG |
699 | } else { |
700 | list_del(&buddy->lru); | |
701 | zone->free_area[order].nr_free--; | |
702 | rmv_page_order(buddy); | |
703 | } | |
43506fad | 704 | combined_idx = buddy_idx & page_idx; |
1da177e4 LT |
705 | page = page + (combined_idx - page_idx); |
706 | page_idx = combined_idx; | |
707 | order++; | |
708 | } | |
709 | set_page_order(page, order); | |
6dda9d55 CZ |
710 | |
711 | /* | |
712 | * If this is not the largest possible page, check if the buddy | |
713 | * of the next-highest order is free. If it is, it's possible | |
714 | * that pages are being freed that will coalesce soon. In case, | |
715 | * that is happening, add the free page to the tail of the list | |
716 | * so it's less likely to be used soon and more likely to be merged | |
717 | * as a higher order page | |
718 | */ | |
b7f50cfa | 719 | if ((order < MAX_ORDER-2) && pfn_valid_within(page_to_pfn(buddy))) { |
6dda9d55 | 720 | struct page *higher_page, *higher_buddy; |
43506fad KC |
721 | combined_idx = buddy_idx & page_idx; |
722 | higher_page = page + (combined_idx - page_idx); | |
723 | buddy_idx = __find_buddy_index(combined_idx, order + 1); | |
0ba8f2d5 | 724 | higher_buddy = higher_page + (buddy_idx - combined_idx); |
6dda9d55 CZ |
725 | if (page_is_buddy(higher_page, higher_buddy, order + 1)) { |
726 | list_add_tail(&page->lru, | |
727 | &zone->free_area[order].free_list[migratetype]); | |
728 | goto out; | |
729 | } | |
730 | } | |
731 | ||
732 | list_add(&page->lru, &zone->free_area[order].free_list[migratetype]); | |
733 | out: | |
1da177e4 LT |
734 | zone->free_area[order].nr_free++; |
735 | } | |
736 | ||
224abf92 | 737 | static inline int free_pages_check(struct page *page) |
1da177e4 | 738 | { |
d230dec1 | 739 | const char *bad_reason = NULL; |
f0b791a3 DH |
740 | unsigned long bad_flags = 0; |
741 | ||
742 | if (unlikely(page_mapcount(page))) | |
743 | bad_reason = "nonzero mapcount"; | |
744 | if (unlikely(page->mapping != NULL)) | |
745 | bad_reason = "non-NULL mapping"; | |
746 | if (unlikely(atomic_read(&page->_count) != 0)) | |
747 | bad_reason = "nonzero _count"; | |
748 | if (unlikely(page->flags & PAGE_FLAGS_CHECK_AT_FREE)) { | |
749 | bad_reason = "PAGE_FLAGS_CHECK_AT_FREE flag(s) set"; | |
750 | bad_flags = PAGE_FLAGS_CHECK_AT_FREE; | |
751 | } | |
9edad6ea JW |
752 | #ifdef CONFIG_MEMCG |
753 | if (unlikely(page->mem_cgroup)) | |
754 | bad_reason = "page still charged to cgroup"; | |
755 | #endif | |
f0b791a3 DH |
756 | if (unlikely(bad_reason)) { |
757 | bad_page(page, bad_reason, bad_flags); | |
79f4b7bf | 758 | return 1; |
8cc3b392 | 759 | } |
90572890 | 760 | page_cpupid_reset_last(page); |
79f4b7bf HD |
761 | if (page->flags & PAGE_FLAGS_CHECK_AT_PREP) |
762 | page->flags &= ~PAGE_FLAGS_CHECK_AT_PREP; | |
763 | return 0; | |
1da177e4 LT |
764 | } |
765 | ||
766 | /* | |
5f8dcc21 | 767 | * Frees a number of pages from the PCP lists |
1da177e4 | 768 | * Assumes all pages on list are in same zone, and of same order. |
207f36ee | 769 | * count is the number of pages to free. |
1da177e4 LT |
770 | * |
771 | * If the zone was previously in an "all pages pinned" state then look to | |
772 | * see if this freeing clears that state. | |
773 | * | |
774 | * And clear the zone's pages_scanned counter, to hold off the "all pages are | |
775 | * pinned" detection logic. | |
776 | */ | |
5f8dcc21 MG |
777 | static void free_pcppages_bulk(struct zone *zone, int count, |
778 | struct per_cpu_pages *pcp) | |
1da177e4 | 779 | { |
5f8dcc21 | 780 | int migratetype = 0; |
a6f9edd6 | 781 | int batch_free = 0; |
72853e29 | 782 | int to_free = count; |
0d5d823a | 783 | unsigned long nr_scanned; |
5f8dcc21 | 784 | |
c54ad30c | 785 | spin_lock(&zone->lock); |
0d5d823a MG |
786 | nr_scanned = zone_page_state(zone, NR_PAGES_SCANNED); |
787 | if (nr_scanned) | |
788 | __mod_zone_page_state(zone, NR_PAGES_SCANNED, -nr_scanned); | |
f2260e6b | 789 | |
72853e29 | 790 | while (to_free) { |
48db57f8 | 791 | struct page *page; |
5f8dcc21 MG |
792 | struct list_head *list; |
793 | ||
794 | /* | |
a6f9edd6 MG |
795 | * Remove pages from lists in a round-robin fashion. A |
796 | * batch_free count is maintained that is incremented when an | |
797 | * empty list is encountered. This is so more pages are freed | |
798 | * off fuller lists instead of spinning excessively around empty | |
799 | * lists | |
5f8dcc21 MG |
800 | */ |
801 | do { | |
a6f9edd6 | 802 | batch_free++; |
5f8dcc21 MG |
803 | if (++migratetype == MIGRATE_PCPTYPES) |
804 | migratetype = 0; | |
805 | list = &pcp->lists[migratetype]; | |
806 | } while (list_empty(list)); | |
48db57f8 | 807 | |
1d16871d NK |
808 | /* This is the only non-empty list. Free them all. */ |
809 | if (batch_free == MIGRATE_PCPTYPES) | |
810 | batch_free = to_free; | |
811 | ||
a6f9edd6 | 812 | do { |
770c8aaa BZ |
813 | int mt; /* migratetype of the to-be-freed page */ |
814 | ||
a6f9edd6 MG |
815 | page = list_entry(list->prev, struct page, lru); |
816 | /* must delete as __free_one_page list manipulates */ | |
817 | list_del(&page->lru); | |
aa016d14 | 818 | |
bb14c2c7 | 819 | mt = get_pcppage_migratetype(page); |
aa016d14 VB |
820 | /* MIGRATE_ISOLATE page should not go to pcplists */ |
821 | VM_BUG_ON_PAGE(is_migrate_isolate(mt), page); | |
822 | /* Pageblock could have been isolated meanwhile */ | |
8f82b55d | 823 | if (unlikely(has_isolate_pageblock(zone))) |
51bb1a40 | 824 | mt = get_pageblock_migratetype(page); |
51bb1a40 | 825 | |
dc4b0caf | 826 | __free_one_page(page, page_to_pfn(page), zone, 0, mt); |
770c8aaa | 827 | trace_mm_page_pcpu_drain(page, 0, mt); |
72853e29 | 828 | } while (--to_free && --batch_free && !list_empty(list)); |
1da177e4 | 829 | } |
c54ad30c | 830 | spin_unlock(&zone->lock); |
1da177e4 LT |
831 | } |
832 | ||
dc4b0caf MG |
833 | static void free_one_page(struct zone *zone, |
834 | struct page *page, unsigned long pfn, | |
7aeb09f9 | 835 | unsigned int order, |
ed0ae21d | 836 | int migratetype) |
1da177e4 | 837 | { |
0d5d823a | 838 | unsigned long nr_scanned; |
006d22d9 | 839 | spin_lock(&zone->lock); |
0d5d823a MG |
840 | nr_scanned = zone_page_state(zone, NR_PAGES_SCANNED); |
841 | if (nr_scanned) | |
842 | __mod_zone_page_state(zone, NR_PAGES_SCANNED, -nr_scanned); | |
f2260e6b | 843 | |
ad53f92e JK |
844 | if (unlikely(has_isolate_pageblock(zone) || |
845 | is_migrate_isolate(migratetype))) { | |
846 | migratetype = get_pfnblock_migratetype(page, pfn); | |
ad53f92e | 847 | } |
dc4b0caf | 848 | __free_one_page(page, pfn, zone, order, migratetype); |
006d22d9 | 849 | spin_unlock(&zone->lock); |
48db57f8 NP |
850 | } |
851 | ||
81422f29 KS |
852 | static int free_tail_pages_check(struct page *head_page, struct page *page) |
853 | { | |
1d798ca3 KS |
854 | int ret = 1; |
855 | ||
856 | /* | |
857 | * We rely page->lru.next never has bit 0 set, unless the page | |
858 | * is PageTail(). Let's make sure that's true even for poisoned ->lru. | |
859 | */ | |
860 | BUILD_BUG_ON((unsigned long)LIST_POISON1 & 1); | |
861 | ||
862 | if (!IS_ENABLED(CONFIG_DEBUG_VM)) { | |
863 | ret = 0; | |
864 | goto out; | |
865 | } | |
81422f29 KS |
866 | if (unlikely(!PageTail(page))) { |
867 | bad_page(page, "PageTail not set", 0); | |
1d798ca3 | 868 | goto out; |
81422f29 | 869 | } |
1d798ca3 KS |
870 | if (unlikely(compound_head(page) != head_page)) { |
871 | bad_page(page, "compound_head not consistent", 0); | |
872 | goto out; | |
81422f29 | 873 | } |
1d798ca3 KS |
874 | ret = 0; |
875 | out: | |
876 | clear_compound_head(page); | |
877 | return ret; | |
81422f29 KS |
878 | } |
879 | ||
1e8ce83c RH |
880 | static void __meminit __init_single_page(struct page *page, unsigned long pfn, |
881 | unsigned long zone, int nid) | |
882 | { | |
1e8ce83c | 883 | set_page_links(page, zone, nid, pfn); |
1e8ce83c RH |
884 | init_page_count(page); |
885 | page_mapcount_reset(page); | |
886 | page_cpupid_reset_last(page); | |
1e8ce83c | 887 | |
1e8ce83c RH |
888 | INIT_LIST_HEAD(&page->lru); |
889 | #ifdef WANT_PAGE_VIRTUAL | |
890 | /* The shift won't overflow because ZONE_NORMAL is below 4G. */ | |
891 | if (!is_highmem_idx(zone)) | |
892 | set_page_address(page, __va(pfn << PAGE_SHIFT)); | |
893 | #endif | |
894 | } | |
895 | ||
896 | static void __meminit __init_single_pfn(unsigned long pfn, unsigned long zone, | |
897 | int nid) | |
898 | { | |
899 | return __init_single_page(pfn_to_page(pfn), pfn, zone, nid); | |
900 | } | |
901 | ||
7e18adb4 MG |
902 | #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT |
903 | static void init_reserved_page(unsigned long pfn) | |
904 | { | |
905 | pg_data_t *pgdat; | |
906 | int nid, zid; | |
907 | ||
908 | if (!early_page_uninitialised(pfn)) | |
909 | return; | |
910 | ||
911 | nid = early_pfn_to_nid(pfn); | |
912 | pgdat = NODE_DATA(nid); | |
913 | ||
914 | for (zid = 0; zid < MAX_NR_ZONES; zid++) { | |
915 | struct zone *zone = &pgdat->node_zones[zid]; | |
916 | ||
917 | if (pfn >= zone->zone_start_pfn && pfn < zone_end_pfn(zone)) | |
918 | break; | |
919 | } | |
920 | __init_single_pfn(pfn, zid, nid); | |
921 | } | |
922 | #else | |
923 | static inline void init_reserved_page(unsigned long pfn) | |
924 | { | |
925 | } | |
926 | #endif /* CONFIG_DEFERRED_STRUCT_PAGE_INIT */ | |
927 | ||
92923ca3 NZ |
928 | /* |
929 | * Initialised pages do not have PageReserved set. This function is | |
930 | * called for each range allocated by the bootmem allocator and | |
931 | * marks the pages PageReserved. The remaining valid pages are later | |
932 | * sent to the buddy page allocator. | |
933 | */ | |
7e18adb4 | 934 | void __meminit reserve_bootmem_region(unsigned long start, unsigned long end) |
92923ca3 NZ |
935 | { |
936 | unsigned long start_pfn = PFN_DOWN(start); | |
937 | unsigned long end_pfn = PFN_UP(end); | |
938 | ||
7e18adb4 MG |
939 | for (; start_pfn < end_pfn; start_pfn++) { |
940 | if (pfn_valid(start_pfn)) { | |
941 | struct page *page = pfn_to_page(start_pfn); | |
942 | ||
943 | init_reserved_page(start_pfn); | |
1d798ca3 KS |
944 | |
945 | /* Avoid false-positive PageTail() */ | |
946 | INIT_LIST_HEAD(&page->lru); | |
947 | ||
7e18adb4 MG |
948 | SetPageReserved(page); |
949 | } | |
950 | } | |
92923ca3 NZ |
951 | } |
952 | ||
ec95f53a | 953 | static bool free_pages_prepare(struct page *page, unsigned int order) |
48db57f8 | 954 | { |
81422f29 KS |
955 | bool compound = PageCompound(page); |
956 | int i, bad = 0; | |
1da177e4 | 957 | |
ab1f306f | 958 | VM_BUG_ON_PAGE(PageTail(page), page); |
81422f29 | 959 | VM_BUG_ON_PAGE(compound && compound_order(page) != order, page); |
ab1f306f | 960 | |
b413d48a | 961 | trace_mm_page_free(page, order); |
b1eeab67 | 962 | kmemcheck_free_shadow(page, order); |
b8c73fc2 | 963 | kasan_free_pages(page, order); |
b1eeab67 | 964 | |
8dd60a3a AA |
965 | if (PageAnon(page)) |
966 | page->mapping = NULL; | |
81422f29 KS |
967 | bad += free_pages_check(page); |
968 | for (i = 1; i < (1 << order); i++) { | |
969 | if (compound) | |
970 | bad += free_tail_pages_check(page, page + i); | |
8dd60a3a | 971 | bad += free_pages_check(page + i); |
81422f29 | 972 | } |
8cc3b392 | 973 | if (bad) |
ec95f53a | 974 | return false; |
689bcebf | 975 | |
48c96a36 JK |
976 | reset_page_owner(page, order); |
977 | ||
3ac7fe5a | 978 | if (!PageHighMem(page)) { |
b8af2941 PK |
979 | debug_check_no_locks_freed(page_address(page), |
980 | PAGE_SIZE << order); | |
3ac7fe5a TG |
981 | debug_check_no_obj_freed(page_address(page), |
982 | PAGE_SIZE << order); | |
983 | } | |
dafb1367 | 984 | arch_free_page(page, order); |
48db57f8 | 985 | kernel_map_pages(page, 1 << order, 0); |
dafb1367 | 986 | |
ec95f53a KM |
987 | return true; |
988 | } | |
989 | ||
990 | static void __free_pages_ok(struct page *page, unsigned int order) | |
991 | { | |
992 | unsigned long flags; | |
95e34412 | 993 | int migratetype; |
dc4b0caf | 994 | unsigned long pfn = page_to_pfn(page); |
ec95f53a KM |
995 | |
996 | if (!free_pages_prepare(page, order)) | |
997 | return; | |
998 | ||
cfc47a28 | 999 | migratetype = get_pfnblock_migratetype(page, pfn); |
c54ad30c | 1000 | local_irq_save(flags); |
f8891e5e | 1001 | __count_vm_events(PGFREE, 1 << order); |
dc4b0caf | 1002 | free_one_page(page_zone(page), page, pfn, order, migratetype); |
c54ad30c | 1003 | local_irq_restore(flags); |
1da177e4 LT |
1004 | } |
1005 | ||
0e1cc95b | 1006 | static void __init __free_pages_boot_core(struct page *page, |
3a80a7fa | 1007 | unsigned long pfn, unsigned int order) |
a226f6c8 | 1008 | { |
c3993076 | 1009 | unsigned int nr_pages = 1 << order; |
e2d0bd2b | 1010 | struct page *p = page; |
c3993076 | 1011 | unsigned int loop; |
a226f6c8 | 1012 | |
e2d0bd2b YL |
1013 | prefetchw(p); |
1014 | for (loop = 0; loop < (nr_pages - 1); loop++, p++) { | |
1015 | prefetchw(p + 1); | |
c3993076 JW |
1016 | __ClearPageReserved(p); |
1017 | set_page_count(p, 0); | |
a226f6c8 | 1018 | } |
e2d0bd2b YL |
1019 | __ClearPageReserved(p); |
1020 | set_page_count(p, 0); | |
c3993076 | 1021 | |
e2d0bd2b | 1022 | page_zone(page)->managed_pages += nr_pages; |
c3993076 JW |
1023 | set_page_refcounted(page); |
1024 | __free_pages(page, order); | |
a226f6c8 DH |
1025 | } |
1026 | ||
75a592a4 MG |
1027 | #if defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID) || \ |
1028 | defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) | |
7ace9917 | 1029 | |
75a592a4 MG |
1030 | static struct mminit_pfnnid_cache early_pfnnid_cache __meminitdata; |
1031 | ||
1032 | int __meminit early_pfn_to_nid(unsigned long pfn) | |
1033 | { | |
7ace9917 | 1034 | static DEFINE_SPINLOCK(early_pfn_lock); |
75a592a4 MG |
1035 | int nid; |
1036 | ||
7ace9917 | 1037 | spin_lock(&early_pfn_lock); |
75a592a4 | 1038 | nid = __early_pfn_to_nid(pfn, &early_pfnnid_cache); |
7ace9917 MG |
1039 | if (nid < 0) |
1040 | nid = 0; | |
1041 | spin_unlock(&early_pfn_lock); | |
1042 | ||
1043 | return nid; | |
75a592a4 MG |
1044 | } |
1045 | #endif | |
1046 | ||
1047 | #ifdef CONFIG_NODES_SPAN_OTHER_NODES | |
1048 | static inline bool __meminit meminit_pfn_in_nid(unsigned long pfn, int node, | |
1049 | struct mminit_pfnnid_cache *state) | |
1050 | { | |
1051 | int nid; | |
1052 | ||
1053 | nid = __early_pfn_to_nid(pfn, state); | |
1054 | if (nid >= 0 && nid != node) | |
1055 | return false; | |
1056 | return true; | |
1057 | } | |
1058 | ||
1059 | /* Only safe to use early in boot when initialisation is single-threaded */ | |
1060 | static inline bool __meminit early_pfn_in_nid(unsigned long pfn, int node) | |
1061 | { | |
1062 | return meminit_pfn_in_nid(pfn, node, &early_pfnnid_cache); | |
1063 | } | |
1064 | ||
1065 | #else | |
1066 | ||
1067 | static inline bool __meminit early_pfn_in_nid(unsigned long pfn, int node) | |
1068 | { | |
1069 | return true; | |
1070 | } | |
1071 | static inline bool __meminit meminit_pfn_in_nid(unsigned long pfn, int node, | |
1072 | struct mminit_pfnnid_cache *state) | |
1073 | { | |
1074 | return true; | |
1075 | } | |
1076 | #endif | |
1077 | ||
1078 | ||
0e1cc95b | 1079 | void __init __free_pages_bootmem(struct page *page, unsigned long pfn, |
3a80a7fa MG |
1080 | unsigned int order) |
1081 | { | |
1082 | if (early_page_uninitialised(pfn)) | |
1083 | return; | |
1084 | return __free_pages_boot_core(page, pfn, order); | |
1085 | } | |
1086 | ||
7e18adb4 | 1087 | #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT |
0e1cc95b | 1088 | static void __init deferred_free_range(struct page *page, |
a4de83dd MG |
1089 | unsigned long pfn, int nr_pages) |
1090 | { | |
1091 | int i; | |
1092 | ||
1093 | if (!page) | |
1094 | return; | |
1095 | ||
1096 | /* Free a large naturally-aligned chunk if possible */ | |
1097 | if (nr_pages == MAX_ORDER_NR_PAGES && | |
1098 | (pfn & (MAX_ORDER_NR_PAGES-1)) == 0) { | |
ac5d2539 | 1099 | set_pageblock_migratetype(page, MIGRATE_MOVABLE); |
a4de83dd MG |
1100 | __free_pages_boot_core(page, pfn, MAX_ORDER-1); |
1101 | return; | |
1102 | } | |
1103 | ||
1104 | for (i = 0; i < nr_pages; i++, page++, pfn++) | |
1105 | __free_pages_boot_core(page, pfn, 0); | |
1106 | } | |
1107 | ||
d3cd131d NS |
1108 | /* Completion tracking for deferred_init_memmap() threads */ |
1109 | static atomic_t pgdat_init_n_undone __initdata; | |
1110 | static __initdata DECLARE_COMPLETION(pgdat_init_all_done_comp); | |
1111 | ||
1112 | static inline void __init pgdat_init_report_one_done(void) | |
1113 | { | |
1114 | if (atomic_dec_and_test(&pgdat_init_n_undone)) | |
1115 | complete(&pgdat_init_all_done_comp); | |
1116 | } | |
0e1cc95b | 1117 | |
7e18adb4 | 1118 | /* Initialise remaining memory on a node */ |
0e1cc95b | 1119 | static int __init deferred_init_memmap(void *data) |
7e18adb4 | 1120 | { |
0e1cc95b MG |
1121 | pg_data_t *pgdat = data; |
1122 | int nid = pgdat->node_id; | |
7e18adb4 MG |
1123 | struct mminit_pfnnid_cache nid_init_state = { }; |
1124 | unsigned long start = jiffies; | |
1125 | unsigned long nr_pages = 0; | |
1126 | unsigned long walk_start, walk_end; | |
1127 | int i, zid; | |
1128 | struct zone *zone; | |
7e18adb4 | 1129 | unsigned long first_init_pfn = pgdat->first_deferred_pfn; |
0e1cc95b | 1130 | const struct cpumask *cpumask = cpumask_of_node(pgdat->node_id); |
7e18adb4 | 1131 | |
0e1cc95b | 1132 | if (first_init_pfn == ULONG_MAX) { |
d3cd131d | 1133 | pgdat_init_report_one_done(); |
0e1cc95b MG |
1134 | return 0; |
1135 | } | |
1136 | ||
1137 | /* Bind memory initialisation thread to a local node if possible */ | |
1138 | if (!cpumask_empty(cpumask)) | |
1139 | set_cpus_allowed_ptr(current, cpumask); | |
7e18adb4 MG |
1140 | |
1141 | /* Sanity check boundaries */ | |
1142 | BUG_ON(pgdat->first_deferred_pfn < pgdat->node_start_pfn); | |
1143 | BUG_ON(pgdat->first_deferred_pfn > pgdat_end_pfn(pgdat)); | |
1144 | pgdat->first_deferred_pfn = ULONG_MAX; | |
1145 | ||
1146 | /* Only the highest zone is deferred so find it */ | |
1147 | for (zid = 0; zid < MAX_NR_ZONES; zid++) { | |
1148 | zone = pgdat->node_zones + zid; | |
1149 | if (first_init_pfn < zone_end_pfn(zone)) | |
1150 | break; | |
1151 | } | |
1152 | ||
1153 | for_each_mem_pfn_range(i, nid, &walk_start, &walk_end, NULL) { | |
1154 | unsigned long pfn, end_pfn; | |
54608c3f | 1155 | struct page *page = NULL; |
a4de83dd MG |
1156 | struct page *free_base_page = NULL; |
1157 | unsigned long free_base_pfn = 0; | |
1158 | int nr_to_free = 0; | |
7e18adb4 MG |
1159 | |
1160 | end_pfn = min(walk_end, zone_end_pfn(zone)); | |
1161 | pfn = first_init_pfn; | |
1162 | if (pfn < walk_start) | |
1163 | pfn = walk_start; | |
1164 | if (pfn < zone->zone_start_pfn) | |
1165 | pfn = zone->zone_start_pfn; | |
1166 | ||
1167 | for (; pfn < end_pfn; pfn++) { | |
54608c3f | 1168 | if (!pfn_valid_within(pfn)) |
a4de83dd | 1169 | goto free_range; |
7e18adb4 | 1170 | |
54608c3f MG |
1171 | /* |
1172 | * Ensure pfn_valid is checked every | |
1173 | * MAX_ORDER_NR_PAGES for memory holes | |
1174 | */ | |
1175 | if ((pfn & (MAX_ORDER_NR_PAGES - 1)) == 0) { | |
1176 | if (!pfn_valid(pfn)) { | |
1177 | page = NULL; | |
a4de83dd | 1178 | goto free_range; |
54608c3f MG |
1179 | } |
1180 | } | |
1181 | ||
1182 | if (!meminit_pfn_in_nid(pfn, nid, &nid_init_state)) { | |
1183 | page = NULL; | |
a4de83dd | 1184 | goto free_range; |
54608c3f MG |
1185 | } |
1186 | ||
1187 | /* Minimise pfn page lookups and scheduler checks */ | |
1188 | if (page && (pfn & (MAX_ORDER_NR_PAGES - 1)) != 0) { | |
1189 | page++; | |
1190 | } else { | |
a4de83dd MG |
1191 | nr_pages += nr_to_free; |
1192 | deferred_free_range(free_base_page, | |
1193 | free_base_pfn, nr_to_free); | |
1194 | free_base_page = NULL; | |
1195 | free_base_pfn = nr_to_free = 0; | |
1196 | ||
54608c3f MG |
1197 | page = pfn_to_page(pfn); |
1198 | cond_resched(); | |
1199 | } | |
7e18adb4 MG |
1200 | |
1201 | if (page->flags) { | |
1202 | VM_BUG_ON(page_zone(page) != zone); | |
a4de83dd | 1203 | goto free_range; |
7e18adb4 MG |
1204 | } |
1205 | ||
1206 | __init_single_page(page, pfn, zid, nid); | |
a4de83dd MG |
1207 | if (!free_base_page) { |
1208 | free_base_page = page; | |
1209 | free_base_pfn = pfn; | |
1210 | nr_to_free = 0; | |
1211 | } | |
1212 | nr_to_free++; | |
1213 | ||
1214 | /* Where possible, batch up pages for a single free */ | |
1215 | continue; | |
1216 | free_range: | |
1217 | /* Free the current block of pages to allocator */ | |
1218 | nr_pages += nr_to_free; | |
1219 | deferred_free_range(free_base_page, free_base_pfn, | |
1220 | nr_to_free); | |
1221 | free_base_page = NULL; | |
1222 | free_base_pfn = nr_to_free = 0; | |
7e18adb4 | 1223 | } |
a4de83dd | 1224 | |
7e18adb4 MG |
1225 | first_init_pfn = max(end_pfn, first_init_pfn); |
1226 | } | |
1227 | ||
1228 | /* Sanity check that the next zone really is unpopulated */ | |
1229 | WARN_ON(++zid < MAX_NR_ZONES && populated_zone(++zone)); | |
1230 | ||
0e1cc95b | 1231 | pr_info("node %d initialised, %lu pages in %ums\n", nid, nr_pages, |
7e18adb4 | 1232 | jiffies_to_msecs(jiffies - start)); |
d3cd131d NS |
1233 | |
1234 | pgdat_init_report_one_done(); | |
0e1cc95b MG |
1235 | return 0; |
1236 | } | |
1237 | ||
1238 | void __init page_alloc_init_late(void) | |
1239 | { | |
1240 | int nid; | |
1241 | ||
d3cd131d NS |
1242 | /* There will be num_node_state(N_MEMORY) threads */ |
1243 | atomic_set(&pgdat_init_n_undone, num_node_state(N_MEMORY)); | |
0e1cc95b | 1244 | for_each_node_state(nid, N_MEMORY) { |
0e1cc95b MG |
1245 | kthread_run(deferred_init_memmap, NODE_DATA(nid), "pgdatinit%d", nid); |
1246 | } | |
1247 | ||
1248 | /* Block until all are initialised */ | |
d3cd131d | 1249 | wait_for_completion(&pgdat_init_all_done_comp); |
4248b0da MG |
1250 | |
1251 | /* Reinit limits that are based on free pages after the kernel is up */ | |
1252 | files_maxfiles_init(); | |
7e18adb4 MG |
1253 | } |
1254 | #endif /* CONFIG_DEFERRED_STRUCT_PAGE_INIT */ | |
1255 | ||
47118af0 | 1256 | #ifdef CONFIG_CMA |
9cf510a5 | 1257 | /* Free whole pageblock and set its migration type to MIGRATE_CMA. */ |
47118af0 MN |
1258 | void __init init_cma_reserved_pageblock(struct page *page) |
1259 | { | |
1260 | unsigned i = pageblock_nr_pages; | |
1261 | struct page *p = page; | |
1262 | ||
1263 | do { | |
1264 | __ClearPageReserved(p); | |
1265 | set_page_count(p, 0); | |
1266 | } while (++p, --i); | |
1267 | ||
47118af0 | 1268 | set_pageblock_migratetype(page, MIGRATE_CMA); |
dc78327c MN |
1269 | |
1270 | if (pageblock_order >= MAX_ORDER) { | |
1271 | i = pageblock_nr_pages; | |
1272 | p = page; | |
1273 | do { | |
1274 | set_page_refcounted(p); | |
1275 | __free_pages(p, MAX_ORDER - 1); | |
1276 | p += MAX_ORDER_NR_PAGES; | |
1277 | } while (i -= MAX_ORDER_NR_PAGES); | |
1278 | } else { | |
1279 | set_page_refcounted(page); | |
1280 | __free_pages(page, pageblock_order); | |
1281 | } | |
1282 | ||
3dcc0571 | 1283 | adjust_managed_page_count(page, pageblock_nr_pages); |
47118af0 MN |
1284 | } |
1285 | #endif | |
1da177e4 LT |
1286 | |
1287 | /* | |
1288 | * The order of subdivision here is critical for the IO subsystem. | |
1289 | * Please do not alter this order without good reasons and regression | |
1290 | * testing. Specifically, as large blocks of memory are subdivided, | |
1291 | * the order in which smaller blocks are delivered depends on the order | |
1292 | * they're subdivided in this function. This is the primary factor | |
1293 | * influencing the order in which pages are delivered to the IO | |
1294 | * subsystem according to empirical testing, and this is also justified | |
1295 | * by considering the behavior of a buddy system containing a single | |
1296 | * large block of memory acted on by a series of small allocations. | |
1297 | * This behavior is a critical factor in sglist merging's success. | |
1298 | * | |
6d49e352 | 1299 | * -- nyc |
1da177e4 | 1300 | */ |
085cc7d5 | 1301 | static inline void expand(struct zone *zone, struct page *page, |
b2a0ac88 MG |
1302 | int low, int high, struct free_area *area, |
1303 | int migratetype) | |
1da177e4 LT |
1304 | { |
1305 | unsigned long size = 1 << high; | |
1306 | ||
1307 | while (high > low) { | |
1308 | area--; | |
1309 | high--; | |
1310 | size >>= 1; | |
309381fe | 1311 | VM_BUG_ON_PAGE(bad_range(zone, &page[size]), &page[size]); |
c0a32fc5 | 1312 | |
2847cf95 | 1313 | if (IS_ENABLED(CONFIG_DEBUG_PAGEALLOC) && |
e30825f1 | 1314 | debug_guardpage_enabled() && |
2847cf95 | 1315 | high < debug_guardpage_minorder()) { |
c0a32fc5 SG |
1316 | /* |
1317 | * Mark as guard pages (or page), that will allow to | |
1318 | * merge back to allocator when buddy will be freed. | |
1319 | * Corresponding page table entries will not be touched, | |
1320 | * pages will stay not present in virtual address space | |
1321 | */ | |
2847cf95 | 1322 | set_page_guard(zone, &page[size], high, migratetype); |
c0a32fc5 SG |
1323 | continue; |
1324 | } | |
b2a0ac88 | 1325 | list_add(&page[size].lru, &area->free_list[migratetype]); |
1da177e4 LT |
1326 | area->nr_free++; |
1327 | set_page_order(&page[size], high); | |
1328 | } | |
1da177e4 LT |
1329 | } |
1330 | ||
1da177e4 LT |
1331 | /* |
1332 | * This page is about to be returned from the page allocator | |
1333 | */ | |
2a7684a2 | 1334 | static inline int check_new_page(struct page *page) |
1da177e4 | 1335 | { |
d230dec1 | 1336 | const char *bad_reason = NULL; |
f0b791a3 DH |
1337 | unsigned long bad_flags = 0; |
1338 | ||
1339 | if (unlikely(page_mapcount(page))) | |
1340 | bad_reason = "nonzero mapcount"; | |
1341 | if (unlikely(page->mapping != NULL)) | |
1342 | bad_reason = "non-NULL mapping"; | |
1343 | if (unlikely(atomic_read(&page->_count) != 0)) | |
1344 | bad_reason = "nonzero _count"; | |
f4c18e6f NH |
1345 | if (unlikely(page->flags & __PG_HWPOISON)) { |
1346 | bad_reason = "HWPoisoned (hardware-corrupted)"; | |
1347 | bad_flags = __PG_HWPOISON; | |
1348 | } | |
f0b791a3 DH |
1349 | if (unlikely(page->flags & PAGE_FLAGS_CHECK_AT_PREP)) { |
1350 | bad_reason = "PAGE_FLAGS_CHECK_AT_PREP flag set"; | |
1351 | bad_flags = PAGE_FLAGS_CHECK_AT_PREP; | |
1352 | } | |
9edad6ea JW |
1353 | #ifdef CONFIG_MEMCG |
1354 | if (unlikely(page->mem_cgroup)) | |
1355 | bad_reason = "page still charged to cgroup"; | |
1356 | #endif | |
f0b791a3 DH |
1357 | if (unlikely(bad_reason)) { |
1358 | bad_page(page, bad_reason, bad_flags); | |
689bcebf | 1359 | return 1; |
8cc3b392 | 1360 | } |
2a7684a2 WF |
1361 | return 0; |
1362 | } | |
1363 | ||
75379191 VB |
1364 | static int prep_new_page(struct page *page, unsigned int order, gfp_t gfp_flags, |
1365 | int alloc_flags) | |
2a7684a2 WF |
1366 | { |
1367 | int i; | |
1368 | ||
1369 | for (i = 0; i < (1 << order); i++) { | |
1370 | struct page *p = page + i; | |
1371 | if (unlikely(check_new_page(p))) | |
1372 | return 1; | |
1373 | } | |
689bcebf | 1374 | |
4c21e2f2 | 1375 | set_page_private(page, 0); |
7835e98b | 1376 | set_page_refcounted(page); |
cc102509 NP |
1377 | |
1378 | arch_alloc_page(page, order); | |
1da177e4 | 1379 | kernel_map_pages(page, 1 << order, 1); |
b8c73fc2 | 1380 | kasan_alloc_pages(page, order); |
17cf4406 NP |
1381 | |
1382 | if (gfp_flags & __GFP_ZERO) | |
f4d2897b AA |
1383 | for (i = 0; i < (1 << order); i++) |
1384 | clear_highpage(page + i); | |
17cf4406 NP |
1385 | |
1386 | if (order && (gfp_flags & __GFP_COMP)) | |
1387 | prep_compound_page(page, order); | |
1388 | ||
48c96a36 JK |
1389 | set_page_owner(page, order, gfp_flags); |
1390 | ||
75379191 | 1391 | /* |
2f064f34 | 1392 | * page is set pfmemalloc when ALLOC_NO_WATERMARKS was necessary to |
75379191 VB |
1393 | * allocate the page. The expectation is that the caller is taking |
1394 | * steps that will free more memory. The caller should avoid the page | |
1395 | * being used for !PFMEMALLOC purposes. | |
1396 | */ | |
2f064f34 MH |
1397 | if (alloc_flags & ALLOC_NO_WATERMARKS) |
1398 | set_page_pfmemalloc(page); | |
1399 | else | |
1400 | clear_page_pfmemalloc(page); | |
75379191 | 1401 | |
689bcebf | 1402 | return 0; |
1da177e4 LT |
1403 | } |
1404 | ||
56fd56b8 MG |
1405 | /* |
1406 | * Go through the free lists for the given migratetype and remove | |
1407 | * the smallest available page from the freelists | |
1408 | */ | |
728ec980 MG |
1409 | static inline |
1410 | struct page *__rmqueue_smallest(struct zone *zone, unsigned int order, | |
56fd56b8 MG |
1411 | int migratetype) |
1412 | { | |
1413 | unsigned int current_order; | |
b8af2941 | 1414 | struct free_area *area; |
56fd56b8 MG |
1415 | struct page *page; |
1416 | ||
1417 | /* Find a page of the appropriate size in the preferred list */ | |
1418 | for (current_order = order; current_order < MAX_ORDER; ++current_order) { | |
1419 | area = &(zone->free_area[current_order]); | |
1420 | if (list_empty(&area->free_list[migratetype])) | |
1421 | continue; | |
1422 | ||
1423 | page = list_entry(area->free_list[migratetype].next, | |
1424 | struct page, lru); | |
1425 | list_del(&page->lru); | |
1426 | rmv_page_order(page); | |
1427 | area->nr_free--; | |
56fd56b8 | 1428 | expand(zone, page, order, current_order, area, migratetype); |
bb14c2c7 | 1429 | set_pcppage_migratetype(page, migratetype); |
56fd56b8 MG |
1430 | return page; |
1431 | } | |
1432 | ||
1433 | return NULL; | |
1434 | } | |
1435 | ||
1436 | ||
b2a0ac88 MG |
1437 | /* |
1438 | * This array describes the order lists are fallen back to when | |
1439 | * the free lists for the desirable migrate type are depleted | |
1440 | */ | |
47118af0 | 1441 | static int fallbacks[MIGRATE_TYPES][4] = { |
974a786e MG |
1442 | [MIGRATE_UNMOVABLE] = { MIGRATE_RECLAIMABLE, MIGRATE_MOVABLE, MIGRATE_TYPES }, |
1443 | [MIGRATE_RECLAIMABLE] = { MIGRATE_UNMOVABLE, MIGRATE_MOVABLE, MIGRATE_TYPES }, | |
1444 | [MIGRATE_MOVABLE] = { MIGRATE_RECLAIMABLE, MIGRATE_UNMOVABLE, MIGRATE_TYPES }, | |
47118af0 | 1445 | #ifdef CONFIG_CMA |
974a786e | 1446 | [MIGRATE_CMA] = { MIGRATE_TYPES }, /* Never used */ |
47118af0 | 1447 | #endif |
194159fb | 1448 | #ifdef CONFIG_MEMORY_ISOLATION |
974a786e | 1449 | [MIGRATE_ISOLATE] = { MIGRATE_TYPES }, /* Never used */ |
194159fb | 1450 | #endif |
b2a0ac88 MG |
1451 | }; |
1452 | ||
dc67647b JK |
1453 | #ifdef CONFIG_CMA |
1454 | static struct page *__rmqueue_cma_fallback(struct zone *zone, | |
1455 | unsigned int order) | |
1456 | { | |
1457 | return __rmqueue_smallest(zone, order, MIGRATE_CMA); | |
1458 | } | |
1459 | #else | |
1460 | static inline struct page *__rmqueue_cma_fallback(struct zone *zone, | |
1461 | unsigned int order) { return NULL; } | |
1462 | #endif | |
1463 | ||
c361be55 MG |
1464 | /* |
1465 | * Move the free pages in a range to the free lists of the requested type. | |
d9c23400 | 1466 | * Note that start_page and end_pages are not aligned on a pageblock |
c361be55 MG |
1467 | * boundary. If alignment is required, use move_freepages_block() |
1468 | */ | |
435b405c | 1469 | int move_freepages(struct zone *zone, |
b69a7288 AB |
1470 | struct page *start_page, struct page *end_page, |
1471 | int migratetype) | |
c361be55 MG |
1472 | { |
1473 | struct page *page; | |
d00181b9 | 1474 | unsigned int order; |
d100313f | 1475 | int pages_moved = 0; |
c361be55 MG |
1476 | |
1477 | #ifndef CONFIG_HOLES_IN_ZONE | |
1478 | /* | |
1479 | * page_zone is not safe to call in this context when | |
1480 | * CONFIG_HOLES_IN_ZONE is set. This bug check is probably redundant | |
1481 | * anyway as we check zone boundaries in move_freepages_block(). | |
1482 | * Remove at a later date when no bug reports exist related to | |
ac0e5b7a | 1483 | * grouping pages by mobility |
c361be55 | 1484 | */ |
97ee4ba7 | 1485 | VM_BUG_ON(page_zone(start_page) != page_zone(end_page)); |
c361be55 MG |
1486 | #endif |
1487 | ||
1488 | for (page = start_page; page <= end_page;) { | |
344c790e | 1489 | /* Make sure we are not inadvertently changing nodes */ |
309381fe | 1490 | VM_BUG_ON_PAGE(page_to_nid(page) != zone_to_nid(zone), page); |
344c790e | 1491 | |
c361be55 MG |
1492 | if (!pfn_valid_within(page_to_pfn(page))) { |
1493 | page++; | |
1494 | continue; | |
1495 | } | |
1496 | ||
1497 | if (!PageBuddy(page)) { | |
1498 | page++; | |
1499 | continue; | |
1500 | } | |
1501 | ||
1502 | order = page_order(page); | |
84be48d8 KS |
1503 | list_move(&page->lru, |
1504 | &zone->free_area[order].free_list[migratetype]); | |
c361be55 | 1505 | page += 1 << order; |
d100313f | 1506 | pages_moved += 1 << order; |
c361be55 MG |
1507 | } |
1508 | ||
d100313f | 1509 | return pages_moved; |
c361be55 MG |
1510 | } |
1511 | ||
ee6f509c | 1512 | int move_freepages_block(struct zone *zone, struct page *page, |
68e3e926 | 1513 | int migratetype) |
c361be55 MG |
1514 | { |
1515 | unsigned long start_pfn, end_pfn; | |
1516 | struct page *start_page, *end_page; | |
1517 | ||
1518 | start_pfn = page_to_pfn(page); | |
d9c23400 | 1519 | start_pfn = start_pfn & ~(pageblock_nr_pages-1); |
c361be55 | 1520 | start_page = pfn_to_page(start_pfn); |
d9c23400 MG |
1521 | end_page = start_page + pageblock_nr_pages - 1; |
1522 | end_pfn = start_pfn + pageblock_nr_pages - 1; | |
c361be55 MG |
1523 | |
1524 | /* Do not cross zone boundaries */ | |
108bcc96 | 1525 | if (!zone_spans_pfn(zone, start_pfn)) |
c361be55 | 1526 | start_page = page; |
108bcc96 | 1527 | if (!zone_spans_pfn(zone, end_pfn)) |
c361be55 MG |
1528 | return 0; |
1529 | ||
1530 | return move_freepages(zone, start_page, end_page, migratetype); | |
1531 | } | |
1532 | ||
2f66a68f MG |
1533 | static void change_pageblock_range(struct page *pageblock_page, |
1534 | int start_order, int migratetype) | |
1535 | { | |
1536 | int nr_pageblocks = 1 << (start_order - pageblock_order); | |
1537 | ||
1538 | while (nr_pageblocks--) { | |
1539 | set_pageblock_migratetype(pageblock_page, migratetype); | |
1540 | pageblock_page += pageblock_nr_pages; | |
1541 | } | |
1542 | } | |
1543 | ||
fef903ef | 1544 | /* |
9c0415eb VB |
1545 | * When we are falling back to another migratetype during allocation, try to |
1546 | * steal extra free pages from the same pageblocks to satisfy further | |
1547 | * allocations, instead of polluting multiple pageblocks. | |
1548 | * | |
1549 | * If we are stealing a relatively large buddy page, it is likely there will | |
1550 | * be more free pages in the pageblock, so try to steal them all. For | |
1551 | * reclaimable and unmovable allocations, we steal regardless of page size, | |
1552 | * as fragmentation caused by those allocations polluting movable pageblocks | |
1553 | * is worse than movable allocations stealing from unmovable and reclaimable | |
1554 | * pageblocks. | |
fef903ef | 1555 | */ |
4eb7dce6 JK |
1556 | static bool can_steal_fallback(unsigned int order, int start_mt) |
1557 | { | |
1558 | /* | |
1559 | * Leaving this order check is intended, although there is | |
1560 | * relaxed order check in next check. The reason is that | |
1561 | * we can actually steal whole pageblock if this condition met, | |
1562 | * but, below check doesn't guarantee it and that is just heuristic | |
1563 | * so could be changed anytime. | |
1564 | */ | |
1565 | if (order >= pageblock_order) | |
1566 | return true; | |
1567 | ||
1568 | if (order >= pageblock_order / 2 || | |
1569 | start_mt == MIGRATE_RECLAIMABLE || | |
1570 | start_mt == MIGRATE_UNMOVABLE || | |
1571 | page_group_by_mobility_disabled) | |
1572 | return true; | |
1573 | ||
1574 | return false; | |
1575 | } | |
1576 | ||
1577 | /* | |
1578 | * This function implements actual steal behaviour. If order is large enough, | |
1579 | * we can steal whole pageblock. If not, we first move freepages in this | |
1580 | * pageblock and check whether half of pages are moved or not. If half of | |
1581 | * pages are moved, we can change migratetype of pageblock and permanently | |
1582 | * use it's pages as requested migratetype in the future. | |
1583 | */ | |
1584 | static void steal_suitable_fallback(struct zone *zone, struct page *page, | |
1585 | int start_type) | |
fef903ef | 1586 | { |
d00181b9 | 1587 | unsigned int current_order = page_order(page); |
4eb7dce6 | 1588 | int pages; |
fef903ef | 1589 | |
fef903ef SB |
1590 | /* Take ownership for orders >= pageblock_order */ |
1591 | if (current_order >= pageblock_order) { | |
1592 | change_pageblock_range(page, current_order, start_type); | |
3a1086fb | 1593 | return; |
fef903ef SB |
1594 | } |
1595 | ||
4eb7dce6 | 1596 | pages = move_freepages_block(zone, page, start_type); |
fef903ef | 1597 | |
4eb7dce6 JK |
1598 | /* Claim the whole block if over half of it is free */ |
1599 | if (pages >= (1 << (pageblock_order-1)) || | |
1600 | page_group_by_mobility_disabled) | |
1601 | set_pageblock_migratetype(page, start_type); | |
1602 | } | |
1603 | ||
2149cdae JK |
1604 | /* |
1605 | * Check whether there is a suitable fallback freepage with requested order. | |
1606 | * If only_stealable is true, this function returns fallback_mt only if | |
1607 | * we can steal other freepages all together. This would help to reduce | |
1608 | * fragmentation due to mixed migratetype pages in one pageblock. | |
1609 | */ | |
1610 | int find_suitable_fallback(struct free_area *area, unsigned int order, | |
1611 | int migratetype, bool only_stealable, bool *can_steal) | |
4eb7dce6 JK |
1612 | { |
1613 | int i; | |
1614 | int fallback_mt; | |
1615 | ||
1616 | if (area->nr_free == 0) | |
1617 | return -1; | |
1618 | ||
1619 | *can_steal = false; | |
1620 | for (i = 0;; i++) { | |
1621 | fallback_mt = fallbacks[migratetype][i]; | |
974a786e | 1622 | if (fallback_mt == MIGRATE_TYPES) |
4eb7dce6 JK |
1623 | break; |
1624 | ||
1625 | if (list_empty(&area->free_list[fallback_mt])) | |
1626 | continue; | |
fef903ef | 1627 | |
4eb7dce6 JK |
1628 | if (can_steal_fallback(order, migratetype)) |
1629 | *can_steal = true; | |
1630 | ||
2149cdae JK |
1631 | if (!only_stealable) |
1632 | return fallback_mt; | |
1633 | ||
1634 | if (*can_steal) | |
1635 | return fallback_mt; | |
fef903ef | 1636 | } |
4eb7dce6 JK |
1637 | |
1638 | return -1; | |
fef903ef SB |
1639 | } |
1640 | ||
0aaa29a5 MG |
1641 | /* |
1642 | * Reserve a pageblock for exclusive use of high-order atomic allocations if | |
1643 | * there are no empty page blocks that contain a page with a suitable order | |
1644 | */ | |
1645 | static void reserve_highatomic_pageblock(struct page *page, struct zone *zone, | |
1646 | unsigned int alloc_order) | |
1647 | { | |
1648 | int mt; | |
1649 | unsigned long max_managed, flags; | |
1650 | ||
1651 | /* | |
1652 | * Limit the number reserved to 1 pageblock or roughly 1% of a zone. | |
1653 | * Check is race-prone but harmless. | |
1654 | */ | |
1655 | max_managed = (zone->managed_pages / 100) + pageblock_nr_pages; | |
1656 | if (zone->nr_reserved_highatomic >= max_managed) | |
1657 | return; | |
1658 | ||
1659 | spin_lock_irqsave(&zone->lock, flags); | |
1660 | ||
1661 | /* Recheck the nr_reserved_highatomic limit under the lock */ | |
1662 | if (zone->nr_reserved_highatomic >= max_managed) | |
1663 | goto out_unlock; | |
1664 | ||
1665 | /* Yoink! */ | |
1666 | mt = get_pageblock_migratetype(page); | |
1667 | if (mt != MIGRATE_HIGHATOMIC && | |
1668 | !is_migrate_isolate(mt) && !is_migrate_cma(mt)) { | |
1669 | zone->nr_reserved_highatomic += pageblock_nr_pages; | |
1670 | set_pageblock_migratetype(page, MIGRATE_HIGHATOMIC); | |
1671 | move_freepages_block(zone, page, MIGRATE_HIGHATOMIC); | |
1672 | } | |
1673 | ||
1674 | out_unlock: | |
1675 | spin_unlock_irqrestore(&zone->lock, flags); | |
1676 | } | |
1677 | ||
1678 | /* | |
1679 | * Used when an allocation is about to fail under memory pressure. This | |
1680 | * potentially hurts the reliability of high-order allocations when under | |
1681 | * intense memory pressure but failed atomic allocations should be easier | |
1682 | * to recover from than an OOM. | |
1683 | */ | |
1684 | static void unreserve_highatomic_pageblock(const struct alloc_context *ac) | |
1685 | { | |
1686 | struct zonelist *zonelist = ac->zonelist; | |
1687 | unsigned long flags; | |
1688 | struct zoneref *z; | |
1689 | struct zone *zone; | |
1690 | struct page *page; | |
1691 | int order; | |
1692 | ||
1693 | for_each_zone_zonelist_nodemask(zone, z, zonelist, ac->high_zoneidx, | |
1694 | ac->nodemask) { | |
1695 | /* Preserve at least one pageblock */ | |
1696 | if (zone->nr_reserved_highatomic <= pageblock_nr_pages) | |
1697 | continue; | |
1698 | ||
1699 | spin_lock_irqsave(&zone->lock, flags); | |
1700 | for (order = 0; order < MAX_ORDER; order++) { | |
1701 | struct free_area *area = &(zone->free_area[order]); | |
1702 | ||
1703 | if (list_empty(&area->free_list[MIGRATE_HIGHATOMIC])) | |
1704 | continue; | |
1705 | ||
1706 | page = list_entry(area->free_list[MIGRATE_HIGHATOMIC].next, | |
1707 | struct page, lru); | |
1708 | ||
1709 | /* | |
1710 | * It should never happen but changes to locking could | |
1711 | * inadvertently allow a per-cpu drain to add pages | |
1712 | * to MIGRATE_HIGHATOMIC while unreserving so be safe | |
1713 | * and watch for underflows. | |
1714 | */ | |
1715 | zone->nr_reserved_highatomic -= min(pageblock_nr_pages, | |
1716 | zone->nr_reserved_highatomic); | |
1717 | ||
1718 | /* | |
1719 | * Convert to ac->migratetype and avoid the normal | |
1720 | * pageblock stealing heuristics. Minimally, the caller | |
1721 | * is doing the work and needs the pages. More | |
1722 | * importantly, if the block was always converted to | |
1723 | * MIGRATE_UNMOVABLE or another type then the number | |
1724 | * of pageblocks that cannot be completely freed | |
1725 | * may increase. | |
1726 | */ | |
1727 | set_pageblock_migratetype(page, ac->migratetype); | |
1728 | move_freepages_block(zone, page, ac->migratetype); | |
1729 | spin_unlock_irqrestore(&zone->lock, flags); | |
1730 | return; | |
1731 | } | |
1732 | spin_unlock_irqrestore(&zone->lock, flags); | |
1733 | } | |
1734 | } | |
1735 | ||
b2a0ac88 | 1736 | /* Remove an element from the buddy allocator from the fallback list */ |
0ac3a409 | 1737 | static inline struct page * |
7aeb09f9 | 1738 | __rmqueue_fallback(struct zone *zone, unsigned int order, int start_migratetype) |
b2a0ac88 | 1739 | { |
b8af2941 | 1740 | struct free_area *area; |
7aeb09f9 | 1741 | unsigned int current_order; |
b2a0ac88 | 1742 | struct page *page; |
4eb7dce6 JK |
1743 | int fallback_mt; |
1744 | bool can_steal; | |
b2a0ac88 MG |
1745 | |
1746 | /* Find the largest possible block of pages in the other list */ | |
7aeb09f9 MG |
1747 | for (current_order = MAX_ORDER-1; |
1748 | current_order >= order && current_order <= MAX_ORDER-1; | |
1749 | --current_order) { | |
4eb7dce6 JK |
1750 | area = &(zone->free_area[current_order]); |
1751 | fallback_mt = find_suitable_fallback(area, current_order, | |
2149cdae | 1752 | start_migratetype, false, &can_steal); |
4eb7dce6 JK |
1753 | if (fallback_mt == -1) |
1754 | continue; | |
b2a0ac88 | 1755 | |
4eb7dce6 JK |
1756 | page = list_entry(area->free_list[fallback_mt].next, |
1757 | struct page, lru); | |
1758 | if (can_steal) | |
1759 | steal_suitable_fallback(zone, page, start_migratetype); | |
b2a0ac88 | 1760 | |
4eb7dce6 JK |
1761 | /* Remove the page from the freelists */ |
1762 | area->nr_free--; | |
1763 | list_del(&page->lru); | |
1764 | rmv_page_order(page); | |
3a1086fb | 1765 | |
4eb7dce6 JK |
1766 | expand(zone, page, order, current_order, area, |
1767 | start_migratetype); | |
1768 | /* | |
bb14c2c7 | 1769 | * The pcppage_migratetype may differ from pageblock's |
4eb7dce6 | 1770 | * migratetype depending on the decisions in |
bb14c2c7 VB |
1771 | * find_suitable_fallback(). This is OK as long as it does not |
1772 | * differ for MIGRATE_CMA pageblocks. Those can be used as | |
1773 | * fallback only via special __rmqueue_cma_fallback() function | |
4eb7dce6 | 1774 | */ |
bb14c2c7 | 1775 | set_pcppage_migratetype(page, start_migratetype); |
e0fff1bd | 1776 | |
4eb7dce6 JK |
1777 | trace_mm_page_alloc_extfrag(page, order, current_order, |
1778 | start_migratetype, fallback_mt); | |
e0fff1bd | 1779 | |
4eb7dce6 | 1780 | return page; |
b2a0ac88 MG |
1781 | } |
1782 | ||
728ec980 | 1783 | return NULL; |
b2a0ac88 MG |
1784 | } |
1785 | ||
56fd56b8 | 1786 | /* |
1da177e4 LT |
1787 | * Do the hard work of removing an element from the buddy allocator. |
1788 | * Call me with the zone->lock already held. | |
1789 | */ | |
b2a0ac88 | 1790 | static struct page *__rmqueue(struct zone *zone, unsigned int order, |
0aaa29a5 | 1791 | int migratetype, gfp_t gfp_flags) |
1da177e4 | 1792 | { |
1da177e4 LT |
1793 | struct page *page; |
1794 | ||
56fd56b8 | 1795 | page = __rmqueue_smallest(zone, order, migratetype); |
974a786e | 1796 | if (unlikely(!page)) { |
dc67647b JK |
1797 | if (migratetype == MIGRATE_MOVABLE) |
1798 | page = __rmqueue_cma_fallback(zone, order); | |
1799 | ||
1800 | if (!page) | |
1801 | page = __rmqueue_fallback(zone, order, migratetype); | |
728ec980 MG |
1802 | } |
1803 | ||
0d3d062a | 1804 | trace_mm_page_alloc_zone_locked(page, order, migratetype); |
b2a0ac88 | 1805 | return page; |
1da177e4 LT |
1806 | } |
1807 | ||
5f63b720 | 1808 | /* |
1da177e4 LT |
1809 | * Obtain a specified number of elements from the buddy allocator, all under |
1810 | * a single hold of the lock, for efficiency. Add them to the supplied list. | |
1811 | * Returns the number of new pages which were placed at *list. | |
1812 | */ | |
5f63b720 | 1813 | static int rmqueue_bulk(struct zone *zone, unsigned int order, |
b2a0ac88 | 1814 | unsigned long count, struct list_head *list, |
b745bc85 | 1815 | int migratetype, bool cold) |
1da177e4 | 1816 | { |
5bcc9f86 | 1817 | int i; |
5f63b720 | 1818 | |
c54ad30c | 1819 | spin_lock(&zone->lock); |
1da177e4 | 1820 | for (i = 0; i < count; ++i) { |
0aaa29a5 | 1821 | struct page *page = __rmqueue(zone, order, migratetype, 0); |
085cc7d5 | 1822 | if (unlikely(page == NULL)) |
1da177e4 | 1823 | break; |
81eabcbe MG |
1824 | |
1825 | /* | |
1826 | * Split buddy pages returned by expand() are received here | |
1827 | * in physical page order. The page is added to the callers and | |
1828 | * list and the list head then moves forward. From the callers | |
1829 | * perspective, the linked list is ordered by page number in | |
1830 | * some conditions. This is useful for IO devices that can | |
1831 | * merge IO requests if the physical pages are ordered | |
1832 | * properly. | |
1833 | */ | |
b745bc85 | 1834 | if (likely(!cold)) |
e084b2d9 MG |
1835 | list_add(&page->lru, list); |
1836 | else | |
1837 | list_add_tail(&page->lru, list); | |
81eabcbe | 1838 | list = &page->lru; |
bb14c2c7 | 1839 | if (is_migrate_cma(get_pcppage_migratetype(page))) |
d1ce749a BZ |
1840 | __mod_zone_page_state(zone, NR_FREE_CMA_PAGES, |
1841 | -(1 << order)); | |
1da177e4 | 1842 | } |
f2260e6b | 1843 | __mod_zone_page_state(zone, NR_FREE_PAGES, -(i << order)); |
c54ad30c | 1844 | spin_unlock(&zone->lock); |
085cc7d5 | 1845 | return i; |
1da177e4 LT |
1846 | } |
1847 | ||
4ae7c039 | 1848 | #ifdef CONFIG_NUMA |
8fce4d8e | 1849 | /* |
4037d452 CL |
1850 | * Called from the vmstat counter updater to drain pagesets of this |
1851 | * currently executing processor on remote nodes after they have | |
1852 | * expired. | |
1853 | * | |
879336c3 CL |
1854 | * Note that this function must be called with the thread pinned to |
1855 | * a single processor. | |
8fce4d8e | 1856 | */ |
4037d452 | 1857 | void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp) |
4ae7c039 | 1858 | { |
4ae7c039 | 1859 | unsigned long flags; |
7be12fc9 | 1860 | int to_drain, batch; |
4ae7c039 | 1861 | |
4037d452 | 1862 | local_irq_save(flags); |
4db0c3c2 | 1863 | batch = READ_ONCE(pcp->batch); |
7be12fc9 | 1864 | to_drain = min(pcp->count, batch); |
2a13515c KM |
1865 | if (to_drain > 0) { |
1866 | free_pcppages_bulk(zone, to_drain, pcp); | |
1867 | pcp->count -= to_drain; | |
1868 | } | |
4037d452 | 1869 | local_irq_restore(flags); |
4ae7c039 CL |
1870 | } |
1871 | #endif | |
1872 | ||
9f8f2172 | 1873 | /* |
93481ff0 | 1874 | * Drain pcplists of the indicated processor and zone. |
9f8f2172 CL |
1875 | * |
1876 | * The processor must either be the current processor and the | |
1877 | * thread pinned to the current processor or a processor that | |
1878 | * is not online. | |
1879 | */ | |
93481ff0 | 1880 | static void drain_pages_zone(unsigned int cpu, struct zone *zone) |
1da177e4 | 1881 | { |
c54ad30c | 1882 | unsigned long flags; |
93481ff0 VB |
1883 | struct per_cpu_pageset *pset; |
1884 | struct per_cpu_pages *pcp; | |
1da177e4 | 1885 | |
93481ff0 VB |
1886 | local_irq_save(flags); |
1887 | pset = per_cpu_ptr(zone->pageset, cpu); | |
1da177e4 | 1888 | |
93481ff0 VB |
1889 | pcp = &pset->pcp; |
1890 | if (pcp->count) { | |
1891 | free_pcppages_bulk(zone, pcp->count, pcp); | |
1892 | pcp->count = 0; | |
1893 | } | |
1894 | local_irq_restore(flags); | |
1895 | } | |
3dfa5721 | 1896 | |
93481ff0 VB |
1897 | /* |
1898 | * Drain pcplists of all zones on the indicated processor. | |
1899 | * | |
1900 | * The processor must either be the current processor and the | |
1901 | * thread pinned to the current processor or a processor that | |
1902 | * is not online. | |
1903 | */ | |
1904 | static void drain_pages(unsigned int cpu) | |
1905 | { | |
1906 | struct zone *zone; | |
1907 | ||
1908 | for_each_populated_zone(zone) { | |
1909 | drain_pages_zone(cpu, zone); | |
1da177e4 LT |
1910 | } |
1911 | } | |
1da177e4 | 1912 | |
9f8f2172 CL |
1913 | /* |
1914 | * Spill all of this CPU's per-cpu pages back into the buddy allocator. | |
93481ff0 VB |
1915 | * |
1916 | * The CPU has to be pinned. When zone parameter is non-NULL, spill just | |
1917 | * the single zone's pages. | |
9f8f2172 | 1918 | */ |
93481ff0 | 1919 | void drain_local_pages(struct zone *zone) |
9f8f2172 | 1920 | { |
93481ff0 VB |
1921 | int cpu = smp_processor_id(); |
1922 | ||
1923 | if (zone) | |
1924 | drain_pages_zone(cpu, zone); | |
1925 | else | |
1926 | drain_pages(cpu); | |
9f8f2172 CL |
1927 | } |
1928 | ||
1929 | /* | |
74046494 GBY |
1930 | * Spill all the per-cpu pages from all CPUs back into the buddy allocator. |
1931 | * | |
93481ff0 VB |
1932 | * When zone parameter is non-NULL, spill just the single zone's pages. |
1933 | * | |
74046494 GBY |
1934 | * Note that this code is protected against sending an IPI to an offline |
1935 | * CPU but does not guarantee sending an IPI to newly hotplugged CPUs: | |
1936 | * on_each_cpu_mask() blocks hotplug and won't talk to offlined CPUs but | |
1937 | * nothing keeps CPUs from showing up after we populated the cpumask and | |
1938 | * before the call to on_each_cpu_mask(). | |
9f8f2172 | 1939 | */ |
93481ff0 | 1940 | void drain_all_pages(struct zone *zone) |
9f8f2172 | 1941 | { |
74046494 | 1942 | int cpu; |
74046494 GBY |
1943 | |
1944 | /* | |
1945 | * Allocate in the BSS so we wont require allocation in | |
1946 | * direct reclaim path for CONFIG_CPUMASK_OFFSTACK=y | |
1947 | */ | |
1948 | static cpumask_t cpus_with_pcps; | |
1949 | ||
1950 | /* | |
1951 | * We don't care about racing with CPU hotplug event | |
1952 | * as offline notification will cause the notified | |
1953 | * cpu to drain that CPU pcps and on_each_cpu_mask | |
1954 | * disables preemption as part of its processing | |
1955 | */ | |
1956 | for_each_online_cpu(cpu) { | |
93481ff0 VB |
1957 | struct per_cpu_pageset *pcp; |
1958 | struct zone *z; | |
74046494 | 1959 | bool has_pcps = false; |
93481ff0 VB |
1960 | |
1961 | if (zone) { | |
74046494 | 1962 | pcp = per_cpu_ptr(zone->pageset, cpu); |
93481ff0 | 1963 | if (pcp->pcp.count) |
74046494 | 1964 | has_pcps = true; |
93481ff0 VB |
1965 | } else { |
1966 | for_each_populated_zone(z) { | |
1967 | pcp = per_cpu_ptr(z->pageset, cpu); | |
1968 | if (pcp->pcp.count) { | |
1969 | has_pcps = true; | |
1970 | break; | |
1971 | } | |
74046494 GBY |
1972 | } |
1973 | } | |
93481ff0 | 1974 | |
74046494 GBY |
1975 | if (has_pcps) |
1976 | cpumask_set_cpu(cpu, &cpus_with_pcps); | |
1977 | else | |
1978 | cpumask_clear_cpu(cpu, &cpus_with_pcps); | |
1979 | } | |
93481ff0 VB |
1980 | on_each_cpu_mask(&cpus_with_pcps, (smp_call_func_t) drain_local_pages, |
1981 | zone, 1); | |
9f8f2172 CL |
1982 | } |
1983 | ||
296699de | 1984 | #ifdef CONFIG_HIBERNATION |
1da177e4 LT |
1985 | |
1986 | void mark_free_pages(struct zone *zone) | |
1987 | { | |
f623f0db RW |
1988 | unsigned long pfn, max_zone_pfn; |
1989 | unsigned long flags; | |
7aeb09f9 | 1990 | unsigned int order, t; |
1da177e4 LT |
1991 | struct list_head *curr; |
1992 | ||
8080fc03 | 1993 | if (zone_is_empty(zone)) |
1da177e4 LT |
1994 | return; |
1995 | ||
1996 | spin_lock_irqsave(&zone->lock, flags); | |
f623f0db | 1997 | |
108bcc96 | 1998 | max_zone_pfn = zone_end_pfn(zone); |
f623f0db RW |
1999 | for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++) |
2000 | if (pfn_valid(pfn)) { | |
2001 | struct page *page = pfn_to_page(pfn); | |
2002 | ||
7be98234 RW |
2003 | if (!swsusp_page_is_forbidden(page)) |
2004 | swsusp_unset_page_free(page); | |
f623f0db | 2005 | } |
1da177e4 | 2006 | |
b2a0ac88 MG |
2007 | for_each_migratetype_order(order, t) { |
2008 | list_for_each(curr, &zone->free_area[order].free_list[t]) { | |
f623f0db | 2009 | unsigned long i; |
1da177e4 | 2010 | |
f623f0db RW |
2011 | pfn = page_to_pfn(list_entry(curr, struct page, lru)); |
2012 | for (i = 0; i < (1UL << order); i++) | |
7be98234 | 2013 | swsusp_set_page_free(pfn_to_page(pfn + i)); |
f623f0db | 2014 | } |
b2a0ac88 | 2015 | } |
1da177e4 LT |
2016 | spin_unlock_irqrestore(&zone->lock, flags); |
2017 | } | |
e2c55dc8 | 2018 | #endif /* CONFIG_PM */ |
1da177e4 | 2019 | |
1da177e4 LT |
2020 | /* |
2021 | * Free a 0-order page | |
b745bc85 | 2022 | * cold == true ? free a cold page : free a hot page |
1da177e4 | 2023 | */ |
b745bc85 | 2024 | void free_hot_cold_page(struct page *page, bool cold) |
1da177e4 LT |
2025 | { |
2026 | struct zone *zone = page_zone(page); | |
2027 | struct per_cpu_pages *pcp; | |
2028 | unsigned long flags; | |
dc4b0caf | 2029 | unsigned long pfn = page_to_pfn(page); |
5f8dcc21 | 2030 | int migratetype; |
1da177e4 | 2031 | |
ec95f53a | 2032 | if (!free_pages_prepare(page, 0)) |
689bcebf HD |
2033 | return; |
2034 | ||
dc4b0caf | 2035 | migratetype = get_pfnblock_migratetype(page, pfn); |
bb14c2c7 | 2036 | set_pcppage_migratetype(page, migratetype); |
1da177e4 | 2037 | local_irq_save(flags); |
f8891e5e | 2038 | __count_vm_event(PGFREE); |
da456f14 | 2039 | |
5f8dcc21 MG |
2040 | /* |
2041 | * We only track unmovable, reclaimable and movable on pcp lists. | |
2042 | * Free ISOLATE pages back to the allocator because they are being | |
2043 | * offlined but treat RESERVE as movable pages so we can get those | |
2044 | * areas back if necessary. Otherwise, we may have to free | |
2045 | * excessively into the page allocator | |
2046 | */ | |
2047 | if (migratetype >= MIGRATE_PCPTYPES) { | |
194159fb | 2048 | if (unlikely(is_migrate_isolate(migratetype))) { |
dc4b0caf | 2049 | free_one_page(zone, page, pfn, 0, migratetype); |
5f8dcc21 MG |
2050 | goto out; |
2051 | } | |
2052 | migratetype = MIGRATE_MOVABLE; | |
2053 | } | |
2054 | ||
99dcc3e5 | 2055 | pcp = &this_cpu_ptr(zone->pageset)->pcp; |
b745bc85 | 2056 | if (!cold) |
5f8dcc21 | 2057 | list_add(&page->lru, &pcp->lists[migratetype]); |
b745bc85 MG |
2058 | else |
2059 | list_add_tail(&page->lru, &pcp->lists[migratetype]); | |
1da177e4 | 2060 | pcp->count++; |
48db57f8 | 2061 | if (pcp->count >= pcp->high) { |
4db0c3c2 | 2062 | unsigned long batch = READ_ONCE(pcp->batch); |
998d39cb CS |
2063 | free_pcppages_bulk(zone, batch, pcp); |
2064 | pcp->count -= batch; | |
48db57f8 | 2065 | } |
5f8dcc21 MG |
2066 | |
2067 | out: | |
1da177e4 | 2068 | local_irq_restore(flags); |
1da177e4 LT |
2069 | } |
2070 | ||
cc59850e KK |
2071 | /* |
2072 | * Free a list of 0-order pages | |
2073 | */ | |
b745bc85 | 2074 | void free_hot_cold_page_list(struct list_head *list, bool cold) |
cc59850e KK |
2075 | { |
2076 | struct page *page, *next; | |
2077 | ||
2078 | list_for_each_entry_safe(page, next, list, lru) { | |
b413d48a | 2079 | trace_mm_page_free_batched(page, cold); |
cc59850e KK |
2080 | free_hot_cold_page(page, cold); |
2081 | } | |
2082 | } | |
2083 | ||
8dfcc9ba NP |
2084 | /* |
2085 | * split_page takes a non-compound higher-order page, and splits it into | |
2086 | * n (1<<order) sub-pages: page[0..n] | |
2087 | * Each sub-page must be freed individually. | |
2088 | * | |
2089 | * Note: this is probably too low level an operation for use in drivers. | |
2090 | * Please consult with lkml before using this in your driver. | |
2091 | */ | |
2092 | void split_page(struct page *page, unsigned int order) | |
2093 | { | |
2094 | int i; | |
e2cfc911 | 2095 | gfp_t gfp_mask; |
8dfcc9ba | 2096 | |
309381fe SL |
2097 | VM_BUG_ON_PAGE(PageCompound(page), page); |
2098 | VM_BUG_ON_PAGE(!page_count(page), page); | |
b1eeab67 VN |
2099 | |
2100 | #ifdef CONFIG_KMEMCHECK | |
2101 | /* | |
2102 | * Split shadow pages too, because free(page[0]) would | |
2103 | * otherwise free the whole shadow. | |
2104 | */ | |
2105 | if (kmemcheck_page_is_tracked(page)) | |
2106 | split_page(virt_to_page(page[0].shadow), order); | |
2107 | #endif | |
2108 | ||
e2cfc911 JK |
2109 | gfp_mask = get_page_owner_gfp(page); |
2110 | set_page_owner(page, 0, gfp_mask); | |
48c96a36 | 2111 | for (i = 1; i < (1 << order); i++) { |
7835e98b | 2112 | set_page_refcounted(page + i); |
e2cfc911 | 2113 | set_page_owner(page + i, 0, gfp_mask); |
48c96a36 | 2114 | } |
8dfcc9ba | 2115 | } |
5853ff23 | 2116 | EXPORT_SYMBOL_GPL(split_page); |
8dfcc9ba | 2117 | |
3c605096 | 2118 | int __isolate_free_page(struct page *page, unsigned int order) |
748446bb | 2119 | { |
748446bb MG |
2120 | unsigned long watermark; |
2121 | struct zone *zone; | |
2139cbe6 | 2122 | int mt; |
748446bb MG |
2123 | |
2124 | BUG_ON(!PageBuddy(page)); | |
2125 | ||
2126 | zone = page_zone(page); | |
2e30abd1 | 2127 | mt = get_pageblock_migratetype(page); |
748446bb | 2128 | |
194159fb | 2129 | if (!is_migrate_isolate(mt)) { |
2e30abd1 MS |
2130 | /* Obey watermarks as if the page was being allocated */ |
2131 | watermark = low_wmark_pages(zone) + (1 << order); | |
2132 | if (!zone_watermark_ok(zone, 0, watermark, 0, 0)) | |
2133 | return 0; | |
2134 | ||
8fb74b9f | 2135 | __mod_zone_freepage_state(zone, -(1UL << order), mt); |
2e30abd1 | 2136 | } |
748446bb MG |
2137 | |
2138 | /* Remove page from free list */ | |
2139 | list_del(&page->lru); | |
2140 | zone->free_area[order].nr_free--; | |
2141 | rmv_page_order(page); | |
2139cbe6 | 2142 | |
e2cfc911 | 2143 | set_page_owner(page, order, __GFP_MOVABLE); |
f3a14ced | 2144 | |
8fb74b9f | 2145 | /* Set the pageblock if the isolated page is at least a pageblock */ |
748446bb MG |
2146 | if (order >= pageblock_order - 1) { |
2147 | struct page *endpage = page + (1 << order) - 1; | |
47118af0 MN |
2148 | for (; page < endpage; page += pageblock_nr_pages) { |
2149 | int mt = get_pageblock_migratetype(page); | |
194159fb | 2150 | if (!is_migrate_isolate(mt) && !is_migrate_cma(mt)) |
47118af0 MN |
2151 | set_pageblock_migratetype(page, |
2152 | MIGRATE_MOVABLE); | |
2153 | } | |
748446bb MG |
2154 | } |
2155 | ||
f3a14ced | 2156 | |
8fb74b9f | 2157 | return 1UL << order; |
1fb3f8ca MG |
2158 | } |
2159 | ||
2160 | /* | |
2161 | * Similar to split_page except the page is already free. As this is only | |
2162 | * being used for migration, the migratetype of the block also changes. | |
2163 | * As this is called with interrupts disabled, the caller is responsible | |
2164 | * for calling arch_alloc_page() and kernel_map_page() after interrupts | |
2165 | * are enabled. | |
2166 | * | |
2167 | * Note: this is probably too low level an operation for use in drivers. | |
2168 | * Please consult with lkml before using this in your driver. | |
2169 | */ | |
2170 | int split_free_page(struct page *page) | |
2171 | { | |
2172 | unsigned int order; | |
2173 | int nr_pages; | |
2174 | ||
1fb3f8ca MG |
2175 | order = page_order(page); |
2176 | ||
8fb74b9f | 2177 | nr_pages = __isolate_free_page(page, order); |
1fb3f8ca MG |
2178 | if (!nr_pages) |
2179 | return 0; | |
2180 | ||
2181 | /* Split into individual pages */ | |
2182 | set_page_refcounted(page); | |
2183 | split_page(page, order); | |
2184 | return nr_pages; | |
748446bb MG |
2185 | } |
2186 | ||
1da177e4 | 2187 | /* |
75379191 | 2188 | * Allocate a page from the given zone. Use pcplists for order-0 allocations. |
1da177e4 | 2189 | */ |
0a15c3e9 MG |
2190 | static inline |
2191 | struct page *buffered_rmqueue(struct zone *preferred_zone, | |
7aeb09f9 | 2192 | struct zone *zone, unsigned int order, |
0aaa29a5 | 2193 | gfp_t gfp_flags, int alloc_flags, int migratetype) |
1da177e4 LT |
2194 | { |
2195 | unsigned long flags; | |
689bcebf | 2196 | struct page *page; |
b745bc85 | 2197 | bool cold = ((gfp_flags & __GFP_COLD) != 0); |
1da177e4 | 2198 | |
48db57f8 | 2199 | if (likely(order == 0)) { |
1da177e4 | 2200 | struct per_cpu_pages *pcp; |
5f8dcc21 | 2201 | struct list_head *list; |
1da177e4 | 2202 | |
1da177e4 | 2203 | local_irq_save(flags); |
99dcc3e5 CL |
2204 | pcp = &this_cpu_ptr(zone->pageset)->pcp; |
2205 | list = &pcp->lists[migratetype]; | |
5f8dcc21 | 2206 | if (list_empty(list)) { |
535131e6 | 2207 | pcp->count += rmqueue_bulk(zone, 0, |
5f8dcc21 | 2208 | pcp->batch, list, |
e084b2d9 | 2209 | migratetype, cold); |
5f8dcc21 | 2210 | if (unlikely(list_empty(list))) |
6fb332fa | 2211 | goto failed; |
535131e6 | 2212 | } |
b92a6edd | 2213 | |
5f8dcc21 MG |
2214 | if (cold) |
2215 | page = list_entry(list->prev, struct page, lru); | |
2216 | else | |
2217 | page = list_entry(list->next, struct page, lru); | |
2218 | ||
b92a6edd MG |
2219 | list_del(&page->lru); |
2220 | pcp->count--; | |
7fb1d9fc | 2221 | } else { |
dab48dab AM |
2222 | if (unlikely(gfp_flags & __GFP_NOFAIL)) { |
2223 | /* | |
2224 | * __GFP_NOFAIL is not to be used in new code. | |
2225 | * | |
2226 | * All __GFP_NOFAIL callers should be fixed so that they | |
2227 | * properly detect and handle allocation failures. | |
2228 | * | |
2229 | * We most definitely don't want callers attempting to | |
4923abf9 | 2230 | * allocate greater than order-1 page units with |
dab48dab AM |
2231 | * __GFP_NOFAIL. |
2232 | */ | |
4923abf9 | 2233 | WARN_ON_ONCE(order > 1); |
dab48dab | 2234 | } |
1da177e4 | 2235 | spin_lock_irqsave(&zone->lock, flags); |
0aaa29a5 MG |
2236 | |
2237 | page = NULL; | |
2238 | if (alloc_flags & ALLOC_HARDER) { | |
2239 | page = __rmqueue_smallest(zone, order, MIGRATE_HIGHATOMIC); | |
2240 | if (page) | |
2241 | trace_mm_page_alloc_zone_locked(page, order, migratetype); | |
2242 | } | |
2243 | if (!page) | |
2244 | page = __rmqueue(zone, order, migratetype, gfp_flags); | |
a74609fa NP |
2245 | spin_unlock(&zone->lock); |
2246 | if (!page) | |
2247 | goto failed; | |
d1ce749a | 2248 | __mod_zone_freepage_state(zone, -(1 << order), |
bb14c2c7 | 2249 | get_pcppage_migratetype(page)); |
1da177e4 LT |
2250 | } |
2251 | ||
3a025760 | 2252 | __mod_zone_page_state(zone, NR_ALLOC_BATCH, -(1 << order)); |
abe5f972 | 2253 | if (atomic_long_read(&zone->vm_stat[NR_ALLOC_BATCH]) <= 0 && |
57054651 JW |
2254 | !test_bit(ZONE_FAIR_DEPLETED, &zone->flags)) |
2255 | set_bit(ZONE_FAIR_DEPLETED, &zone->flags); | |
27329369 | 2256 | |
f8891e5e | 2257 | __count_zone_vm_events(PGALLOC, zone, 1 << order); |
78afd561 | 2258 | zone_statistics(preferred_zone, zone, gfp_flags); |
a74609fa | 2259 | local_irq_restore(flags); |
1da177e4 | 2260 | |
309381fe | 2261 | VM_BUG_ON_PAGE(bad_range(zone, page), page); |
1da177e4 | 2262 | return page; |
a74609fa NP |
2263 | |
2264 | failed: | |
2265 | local_irq_restore(flags); | |
a74609fa | 2266 | return NULL; |
1da177e4 LT |
2267 | } |
2268 | ||
933e312e AM |
2269 | #ifdef CONFIG_FAIL_PAGE_ALLOC |
2270 | ||
b2588c4b | 2271 | static struct { |
933e312e AM |
2272 | struct fault_attr attr; |
2273 | ||
621a5f7a | 2274 | bool ignore_gfp_highmem; |
71baba4b | 2275 | bool ignore_gfp_reclaim; |
54114994 | 2276 | u32 min_order; |
933e312e AM |
2277 | } fail_page_alloc = { |
2278 | .attr = FAULT_ATTR_INITIALIZER, | |
71baba4b | 2279 | .ignore_gfp_reclaim = true, |
621a5f7a | 2280 | .ignore_gfp_highmem = true, |
54114994 | 2281 | .min_order = 1, |
933e312e AM |
2282 | }; |
2283 | ||
2284 | static int __init setup_fail_page_alloc(char *str) | |
2285 | { | |
2286 | return setup_fault_attr(&fail_page_alloc.attr, str); | |
2287 | } | |
2288 | __setup("fail_page_alloc=", setup_fail_page_alloc); | |
2289 | ||
deaf386e | 2290 | static bool should_fail_alloc_page(gfp_t gfp_mask, unsigned int order) |
933e312e | 2291 | { |
54114994 | 2292 | if (order < fail_page_alloc.min_order) |
deaf386e | 2293 | return false; |
933e312e | 2294 | if (gfp_mask & __GFP_NOFAIL) |
deaf386e | 2295 | return false; |
933e312e | 2296 | if (fail_page_alloc.ignore_gfp_highmem && (gfp_mask & __GFP_HIGHMEM)) |
deaf386e | 2297 | return false; |
71baba4b MG |
2298 | if (fail_page_alloc.ignore_gfp_reclaim && |
2299 | (gfp_mask & __GFP_DIRECT_RECLAIM)) | |
deaf386e | 2300 | return false; |
933e312e AM |
2301 | |
2302 | return should_fail(&fail_page_alloc.attr, 1 << order); | |
2303 | } | |
2304 | ||
2305 | #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS | |
2306 | ||
2307 | static int __init fail_page_alloc_debugfs(void) | |
2308 | { | |
f4ae40a6 | 2309 | umode_t mode = S_IFREG | S_IRUSR | S_IWUSR; |
933e312e | 2310 | struct dentry *dir; |
933e312e | 2311 | |
dd48c085 AM |
2312 | dir = fault_create_debugfs_attr("fail_page_alloc", NULL, |
2313 | &fail_page_alloc.attr); | |
2314 | if (IS_ERR(dir)) | |
2315 | return PTR_ERR(dir); | |
933e312e | 2316 | |
b2588c4b | 2317 | if (!debugfs_create_bool("ignore-gfp-wait", mode, dir, |
71baba4b | 2318 | &fail_page_alloc.ignore_gfp_reclaim)) |
b2588c4b AM |
2319 | goto fail; |
2320 | if (!debugfs_create_bool("ignore-gfp-highmem", mode, dir, | |
2321 | &fail_page_alloc.ignore_gfp_highmem)) | |
2322 | goto fail; | |
2323 | if (!debugfs_create_u32("min-order", mode, dir, | |
2324 | &fail_page_alloc.min_order)) | |
2325 | goto fail; | |
2326 | ||
2327 | return 0; | |
2328 | fail: | |
dd48c085 | 2329 | debugfs_remove_recursive(dir); |
933e312e | 2330 | |
b2588c4b | 2331 | return -ENOMEM; |
933e312e AM |
2332 | } |
2333 | ||
2334 | late_initcall(fail_page_alloc_debugfs); | |
2335 | ||
2336 | #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */ | |
2337 | ||
2338 | #else /* CONFIG_FAIL_PAGE_ALLOC */ | |
2339 | ||
deaf386e | 2340 | static inline bool should_fail_alloc_page(gfp_t gfp_mask, unsigned int order) |
933e312e | 2341 | { |
deaf386e | 2342 | return false; |
933e312e AM |
2343 | } |
2344 | ||
2345 | #endif /* CONFIG_FAIL_PAGE_ALLOC */ | |
2346 | ||
1da177e4 | 2347 | /* |
97a16fc8 MG |
2348 | * Return true if free base pages are above 'mark'. For high-order checks it |
2349 | * will return true of the order-0 watermark is reached and there is at least | |
2350 | * one free page of a suitable size. Checking now avoids taking the zone lock | |
2351 | * to check in the allocation paths if no pages are free. | |
1da177e4 | 2352 | */ |
7aeb09f9 MG |
2353 | static bool __zone_watermark_ok(struct zone *z, unsigned int order, |
2354 | unsigned long mark, int classzone_idx, int alloc_flags, | |
2355 | long free_pages) | |
1da177e4 | 2356 | { |
d23ad423 | 2357 | long min = mark; |
1da177e4 | 2358 | int o; |
97a16fc8 | 2359 | const int alloc_harder = (alloc_flags & ALLOC_HARDER); |
1da177e4 | 2360 | |
0aaa29a5 | 2361 | /* free_pages may go negative - that's OK */ |
df0a6daa | 2362 | free_pages -= (1 << order) - 1; |
0aaa29a5 | 2363 | |
7fb1d9fc | 2364 | if (alloc_flags & ALLOC_HIGH) |
1da177e4 | 2365 | min -= min / 2; |
0aaa29a5 MG |
2366 | |
2367 | /* | |
2368 | * If the caller does not have rights to ALLOC_HARDER then subtract | |
2369 | * the high-atomic reserves. This will over-estimate the size of the | |
2370 | * atomic reserve but it avoids a search. | |
2371 | */ | |
97a16fc8 | 2372 | if (likely(!alloc_harder)) |
0aaa29a5 MG |
2373 | free_pages -= z->nr_reserved_highatomic; |
2374 | else | |
1da177e4 | 2375 | min -= min / 4; |
e2b19197 | 2376 | |
d95ea5d1 BZ |
2377 | #ifdef CONFIG_CMA |
2378 | /* If allocation can't use CMA areas don't use free CMA pages */ | |
2379 | if (!(alloc_flags & ALLOC_CMA)) | |
97a16fc8 | 2380 | free_pages -= zone_page_state(z, NR_FREE_CMA_PAGES); |
d95ea5d1 | 2381 | #endif |
026b0814 | 2382 | |
97a16fc8 MG |
2383 | /* |
2384 | * Check watermarks for an order-0 allocation request. If these | |
2385 | * are not met, then a high-order request also cannot go ahead | |
2386 | * even if a suitable page happened to be free. | |
2387 | */ | |
2388 | if (free_pages <= min + z->lowmem_reserve[classzone_idx]) | |
88f5acf8 | 2389 | return false; |
1da177e4 | 2390 | |
97a16fc8 MG |
2391 | /* If this is an order-0 request then the watermark is fine */ |
2392 | if (!order) | |
2393 | return true; | |
2394 | ||
2395 | /* For a high-order request, check at least one suitable page is free */ | |
2396 | for (o = order; o < MAX_ORDER; o++) { | |
2397 | struct free_area *area = &z->free_area[o]; | |
2398 | int mt; | |
2399 | ||
2400 | if (!area->nr_free) | |
2401 | continue; | |
2402 | ||
2403 | if (alloc_harder) | |
2404 | return true; | |
1da177e4 | 2405 | |
97a16fc8 MG |
2406 | for (mt = 0; mt < MIGRATE_PCPTYPES; mt++) { |
2407 | if (!list_empty(&area->free_list[mt])) | |
2408 | return true; | |
2409 | } | |
2410 | ||
2411 | #ifdef CONFIG_CMA | |
2412 | if ((alloc_flags & ALLOC_CMA) && | |
2413 | !list_empty(&area->free_list[MIGRATE_CMA])) { | |
2414 | return true; | |
2415 | } | |
2416 | #endif | |
1da177e4 | 2417 | } |
97a16fc8 | 2418 | return false; |
88f5acf8 MG |
2419 | } |
2420 | ||
7aeb09f9 | 2421 | bool zone_watermark_ok(struct zone *z, unsigned int order, unsigned long mark, |
88f5acf8 MG |
2422 | int classzone_idx, int alloc_flags) |
2423 | { | |
2424 | return __zone_watermark_ok(z, order, mark, classzone_idx, alloc_flags, | |
2425 | zone_page_state(z, NR_FREE_PAGES)); | |
2426 | } | |
2427 | ||
7aeb09f9 | 2428 | bool zone_watermark_ok_safe(struct zone *z, unsigned int order, |
e2b19197 | 2429 | unsigned long mark, int classzone_idx) |
88f5acf8 MG |
2430 | { |
2431 | long free_pages = zone_page_state(z, NR_FREE_PAGES); | |
2432 | ||
2433 | if (z->percpu_drift_mark && free_pages < z->percpu_drift_mark) | |
2434 | free_pages = zone_page_state_snapshot(z, NR_FREE_PAGES); | |
2435 | ||
e2b19197 | 2436 | return __zone_watermark_ok(z, order, mark, classzone_idx, 0, |
88f5acf8 | 2437 | free_pages); |
1da177e4 LT |
2438 | } |
2439 | ||
9276b1bc | 2440 | #ifdef CONFIG_NUMA |
81c0a2bb JW |
2441 | static bool zone_local(struct zone *local_zone, struct zone *zone) |
2442 | { | |
fff4068c | 2443 | return local_zone->node == zone->node; |
81c0a2bb JW |
2444 | } |
2445 | ||
957f822a DR |
2446 | static bool zone_allows_reclaim(struct zone *local_zone, struct zone *zone) |
2447 | { | |
5f7a75ac MG |
2448 | return node_distance(zone_to_nid(local_zone), zone_to_nid(zone)) < |
2449 | RECLAIM_DISTANCE; | |
957f822a | 2450 | } |
9276b1bc | 2451 | #else /* CONFIG_NUMA */ |
81c0a2bb JW |
2452 | static bool zone_local(struct zone *local_zone, struct zone *zone) |
2453 | { | |
2454 | return true; | |
2455 | } | |
2456 | ||
957f822a DR |
2457 | static bool zone_allows_reclaim(struct zone *local_zone, struct zone *zone) |
2458 | { | |
2459 | return true; | |
2460 | } | |
9276b1bc PJ |
2461 | #endif /* CONFIG_NUMA */ |
2462 | ||
4ffeaf35 MG |
2463 | static void reset_alloc_batches(struct zone *preferred_zone) |
2464 | { | |
2465 | struct zone *zone = preferred_zone->zone_pgdat->node_zones; | |
2466 | ||
2467 | do { | |
2468 | mod_zone_page_state(zone, NR_ALLOC_BATCH, | |
2469 | high_wmark_pages(zone) - low_wmark_pages(zone) - | |
2470 | atomic_long_read(&zone->vm_stat[NR_ALLOC_BATCH])); | |
57054651 | 2471 | clear_bit(ZONE_FAIR_DEPLETED, &zone->flags); |
4ffeaf35 MG |
2472 | } while (zone++ != preferred_zone); |
2473 | } | |
2474 | ||
7fb1d9fc | 2475 | /* |
0798e519 | 2476 | * get_page_from_freelist goes through the zonelist trying to allocate |
7fb1d9fc RS |
2477 | * a page. |
2478 | */ | |
2479 | static struct page * | |
a9263751 VB |
2480 | get_page_from_freelist(gfp_t gfp_mask, unsigned int order, int alloc_flags, |
2481 | const struct alloc_context *ac) | |
753ee728 | 2482 | { |
a9263751 | 2483 | struct zonelist *zonelist = ac->zonelist; |
dd1a239f | 2484 | struct zoneref *z; |
7fb1d9fc | 2485 | struct page *page = NULL; |
5117f45d | 2486 | struct zone *zone; |
4ffeaf35 MG |
2487 | int nr_fair_skipped = 0; |
2488 | bool zonelist_rescan; | |
54a6eb5c | 2489 | |
9276b1bc | 2490 | zonelist_scan: |
4ffeaf35 MG |
2491 | zonelist_rescan = false; |
2492 | ||
7fb1d9fc | 2493 | /* |
9276b1bc | 2494 | * Scan zonelist, looking for a zone with enough free. |
344736f2 | 2495 | * See also __cpuset_node_allowed() comment in kernel/cpuset.c. |
7fb1d9fc | 2496 | */ |
a9263751 VB |
2497 | for_each_zone_zonelist_nodemask(zone, z, zonelist, ac->high_zoneidx, |
2498 | ac->nodemask) { | |
e085dbc5 JW |
2499 | unsigned long mark; |
2500 | ||
664eedde MG |
2501 | if (cpusets_enabled() && |
2502 | (alloc_flags & ALLOC_CPUSET) && | |
344736f2 | 2503 | !cpuset_zone_allowed(zone, gfp_mask)) |
cd38b115 | 2504 | continue; |
81c0a2bb JW |
2505 | /* |
2506 | * Distribute pages in proportion to the individual | |
2507 | * zone size to ensure fair page aging. The zone a | |
2508 | * page was allocated in should have no effect on the | |
2509 | * time the page has in memory before being reclaimed. | |
81c0a2bb | 2510 | */ |
3a025760 | 2511 | if (alloc_flags & ALLOC_FAIR) { |
a9263751 | 2512 | if (!zone_local(ac->preferred_zone, zone)) |
f7b5d647 | 2513 | break; |
57054651 | 2514 | if (test_bit(ZONE_FAIR_DEPLETED, &zone->flags)) { |
4ffeaf35 | 2515 | nr_fair_skipped++; |
3a025760 | 2516 | continue; |
4ffeaf35 | 2517 | } |
81c0a2bb | 2518 | } |
a756cf59 JW |
2519 | /* |
2520 | * When allocating a page cache page for writing, we | |
2521 | * want to get it from a zone that is within its dirty | |
2522 | * limit, such that no single zone holds more than its | |
2523 | * proportional share of globally allowed dirty pages. | |
2524 | * The dirty limits take into account the zone's | |
2525 | * lowmem reserves and high watermark so that kswapd | |
2526 | * should be able to balance it without having to | |
2527 | * write pages from its LRU list. | |
2528 | * | |
2529 | * This may look like it could increase pressure on | |
2530 | * lower zones by failing allocations in higher zones | |
2531 | * before they are full. But the pages that do spill | |
2532 | * over are limited as the lower zones are protected | |
2533 | * by this very same mechanism. It should not become | |
2534 | * a practical burden to them. | |
2535 | * | |
2536 | * XXX: For now, allow allocations to potentially | |
2537 | * exceed the per-zone dirty limit in the slowpath | |
c9ab0c4f | 2538 | * (spread_dirty_pages unset) before going into reclaim, |
a756cf59 JW |
2539 | * which is important when on a NUMA setup the allowed |
2540 | * zones are together not big enough to reach the | |
2541 | * global limit. The proper fix for these situations | |
2542 | * will require awareness of zones in the | |
2543 | * dirty-throttling and the flusher threads. | |
2544 | */ | |
c9ab0c4f | 2545 | if (ac->spread_dirty_pages && !zone_dirty_ok(zone)) |
800a1e75 | 2546 | continue; |
7fb1d9fc | 2547 | |
e085dbc5 JW |
2548 | mark = zone->watermark[alloc_flags & ALLOC_WMARK_MASK]; |
2549 | if (!zone_watermark_ok(zone, order, mark, | |
a9263751 | 2550 | ac->classzone_idx, alloc_flags)) { |
fa5e084e MG |
2551 | int ret; |
2552 | ||
5dab2911 MG |
2553 | /* Checked here to keep the fast path fast */ |
2554 | BUILD_BUG_ON(ALLOC_NO_WATERMARKS < NR_WMARK); | |
2555 | if (alloc_flags & ALLOC_NO_WATERMARKS) | |
2556 | goto try_this_zone; | |
2557 | ||
957f822a | 2558 | if (zone_reclaim_mode == 0 || |
a9263751 | 2559 | !zone_allows_reclaim(ac->preferred_zone, zone)) |
cd38b115 MG |
2560 | continue; |
2561 | ||
fa5e084e MG |
2562 | ret = zone_reclaim(zone, gfp_mask, order); |
2563 | switch (ret) { | |
2564 | case ZONE_RECLAIM_NOSCAN: | |
2565 | /* did not scan */ | |
cd38b115 | 2566 | continue; |
fa5e084e MG |
2567 | case ZONE_RECLAIM_FULL: |
2568 | /* scanned but unreclaimable */ | |
cd38b115 | 2569 | continue; |
fa5e084e MG |
2570 | default: |
2571 | /* did we reclaim enough */ | |
fed2719e | 2572 | if (zone_watermark_ok(zone, order, mark, |
a9263751 | 2573 | ac->classzone_idx, alloc_flags)) |
fed2719e MG |
2574 | goto try_this_zone; |
2575 | ||
fed2719e | 2576 | continue; |
0798e519 | 2577 | } |
7fb1d9fc RS |
2578 | } |
2579 | ||
fa5e084e | 2580 | try_this_zone: |
a9263751 | 2581 | page = buffered_rmqueue(ac->preferred_zone, zone, order, |
0aaa29a5 | 2582 | gfp_mask, alloc_flags, ac->migratetype); |
75379191 VB |
2583 | if (page) { |
2584 | if (prep_new_page(page, order, gfp_mask, alloc_flags)) | |
2585 | goto try_this_zone; | |
0aaa29a5 MG |
2586 | |
2587 | /* | |
2588 | * If this is a high-order atomic allocation then check | |
2589 | * if the pageblock should be reserved for the future | |
2590 | */ | |
2591 | if (unlikely(order && (alloc_flags & ALLOC_HARDER))) | |
2592 | reserve_highatomic_pageblock(page, zone, order); | |
2593 | ||
75379191 VB |
2594 | return page; |
2595 | } | |
54a6eb5c | 2596 | } |
9276b1bc | 2597 | |
4ffeaf35 MG |
2598 | /* |
2599 | * The first pass makes sure allocations are spread fairly within the | |
2600 | * local node. However, the local node might have free pages left | |
2601 | * after the fairness batches are exhausted, and remote zones haven't | |
2602 | * even been considered yet. Try once more without fairness, and | |
2603 | * include remote zones now, before entering the slowpath and waking | |
2604 | * kswapd: prefer spilling to a remote zone over swapping locally. | |
2605 | */ | |
2606 | if (alloc_flags & ALLOC_FAIR) { | |
2607 | alloc_flags &= ~ALLOC_FAIR; | |
2608 | if (nr_fair_skipped) { | |
2609 | zonelist_rescan = true; | |
a9263751 | 2610 | reset_alloc_batches(ac->preferred_zone); |
4ffeaf35 MG |
2611 | } |
2612 | if (nr_online_nodes > 1) | |
2613 | zonelist_rescan = true; | |
2614 | } | |
2615 | ||
4ffeaf35 MG |
2616 | if (zonelist_rescan) |
2617 | goto zonelist_scan; | |
2618 | ||
2619 | return NULL; | |
753ee728 MH |
2620 | } |
2621 | ||
29423e77 DR |
2622 | /* |
2623 | * Large machines with many possible nodes should not always dump per-node | |
2624 | * meminfo in irq context. | |
2625 | */ | |
2626 | static inline bool should_suppress_show_mem(void) | |
2627 | { | |
2628 | bool ret = false; | |
2629 | ||
2630 | #if NODES_SHIFT > 8 | |
2631 | ret = in_interrupt(); | |
2632 | #endif | |
2633 | return ret; | |
2634 | } | |
2635 | ||
a238ab5b DH |
2636 | static DEFINE_RATELIMIT_STATE(nopage_rs, |
2637 | DEFAULT_RATELIMIT_INTERVAL, | |
2638 | DEFAULT_RATELIMIT_BURST); | |
2639 | ||
d00181b9 | 2640 | void warn_alloc_failed(gfp_t gfp_mask, unsigned int order, const char *fmt, ...) |
a238ab5b | 2641 | { |
a238ab5b DH |
2642 | unsigned int filter = SHOW_MEM_FILTER_NODES; |
2643 | ||
c0a32fc5 SG |
2644 | if ((gfp_mask & __GFP_NOWARN) || !__ratelimit(&nopage_rs) || |
2645 | debug_guardpage_minorder() > 0) | |
a238ab5b DH |
2646 | return; |
2647 | ||
2648 | /* | |
2649 | * This documents exceptions given to allocations in certain | |
2650 | * contexts that are allowed to allocate outside current's set | |
2651 | * of allowed nodes. | |
2652 | */ | |
2653 | if (!(gfp_mask & __GFP_NOMEMALLOC)) | |
2654 | if (test_thread_flag(TIF_MEMDIE) || | |
2655 | (current->flags & (PF_MEMALLOC | PF_EXITING))) | |
2656 | filter &= ~SHOW_MEM_FILTER_NODES; | |
d0164adc | 2657 | if (in_interrupt() || !(gfp_mask & __GFP_DIRECT_RECLAIM)) |
a238ab5b DH |
2658 | filter &= ~SHOW_MEM_FILTER_NODES; |
2659 | ||
2660 | if (fmt) { | |
3ee9a4f0 JP |
2661 | struct va_format vaf; |
2662 | va_list args; | |
2663 | ||
a238ab5b | 2664 | va_start(args, fmt); |
3ee9a4f0 JP |
2665 | |
2666 | vaf.fmt = fmt; | |
2667 | vaf.va = &args; | |
2668 | ||
2669 | pr_warn("%pV", &vaf); | |
2670 | ||
a238ab5b DH |
2671 | va_end(args); |
2672 | } | |
2673 | ||
d00181b9 | 2674 | pr_warn("%s: page allocation failure: order:%u, mode:0x%x\n", |
3ee9a4f0 | 2675 | current->comm, order, gfp_mask); |
a238ab5b DH |
2676 | |
2677 | dump_stack(); | |
2678 | if (!should_suppress_show_mem()) | |
2679 | show_mem(filter); | |
2680 | } | |
2681 | ||
11e33f6a MG |
2682 | static inline struct page * |
2683 | __alloc_pages_may_oom(gfp_t gfp_mask, unsigned int order, | |
a9263751 | 2684 | const struct alloc_context *ac, unsigned long *did_some_progress) |
11e33f6a | 2685 | { |
6e0fc46d DR |
2686 | struct oom_control oc = { |
2687 | .zonelist = ac->zonelist, | |
2688 | .nodemask = ac->nodemask, | |
2689 | .gfp_mask = gfp_mask, | |
2690 | .order = order, | |
6e0fc46d | 2691 | }; |
11e33f6a MG |
2692 | struct page *page; |
2693 | ||
9879de73 JW |
2694 | *did_some_progress = 0; |
2695 | ||
9879de73 | 2696 | /* |
dc56401f JW |
2697 | * Acquire the oom lock. If that fails, somebody else is |
2698 | * making progress for us. | |
9879de73 | 2699 | */ |
dc56401f | 2700 | if (!mutex_trylock(&oom_lock)) { |
9879de73 | 2701 | *did_some_progress = 1; |
11e33f6a | 2702 | schedule_timeout_uninterruptible(1); |
1da177e4 LT |
2703 | return NULL; |
2704 | } | |
6b1de916 | 2705 | |
11e33f6a MG |
2706 | /* |
2707 | * Go through the zonelist yet one more time, keep very high watermark | |
2708 | * here, this is only to catch a parallel oom killing, we must fail if | |
2709 | * we're still under heavy pressure. | |
2710 | */ | |
a9263751 VB |
2711 | page = get_page_from_freelist(gfp_mask | __GFP_HARDWALL, order, |
2712 | ALLOC_WMARK_HIGH|ALLOC_CPUSET, ac); | |
7fb1d9fc | 2713 | if (page) |
11e33f6a MG |
2714 | goto out; |
2715 | ||
4365a567 | 2716 | if (!(gfp_mask & __GFP_NOFAIL)) { |
9879de73 JW |
2717 | /* Coredumps can quickly deplete all memory reserves */ |
2718 | if (current->flags & PF_DUMPCORE) | |
2719 | goto out; | |
4365a567 KH |
2720 | /* The OOM killer will not help higher order allocs */ |
2721 | if (order > PAGE_ALLOC_COSTLY_ORDER) | |
2722 | goto out; | |
03668b3c | 2723 | /* The OOM killer does not needlessly kill tasks for lowmem */ |
a9263751 | 2724 | if (ac->high_zoneidx < ZONE_NORMAL) |
03668b3c | 2725 | goto out; |
9083905a | 2726 | /* The OOM killer does not compensate for IO-less reclaim */ |
cc873177 JW |
2727 | if (!(gfp_mask & __GFP_FS)) { |
2728 | /* | |
2729 | * XXX: Page reclaim didn't yield anything, | |
2730 | * and the OOM killer can't be invoked, but | |
9083905a | 2731 | * keep looping as per tradition. |
cc873177 JW |
2732 | */ |
2733 | *did_some_progress = 1; | |
9879de73 | 2734 | goto out; |
cc873177 | 2735 | } |
9083905a JW |
2736 | if (pm_suspended_storage()) |
2737 | goto out; | |
4167e9b2 | 2738 | /* The OOM killer may not free memory on a specific node */ |
4365a567 KH |
2739 | if (gfp_mask & __GFP_THISNODE) |
2740 | goto out; | |
2741 | } | |
11e33f6a | 2742 | /* Exhausted what can be done so it's blamo time */ |
6e0fc46d | 2743 | if (out_of_memory(&oc) || WARN_ON_ONCE(gfp_mask & __GFP_NOFAIL)) |
c32b3cbe | 2744 | *did_some_progress = 1; |
11e33f6a | 2745 | out: |
dc56401f | 2746 | mutex_unlock(&oom_lock); |
11e33f6a MG |
2747 | return page; |
2748 | } | |
2749 | ||
56de7263 MG |
2750 | #ifdef CONFIG_COMPACTION |
2751 | /* Try memory compaction for high-order allocations before reclaim */ | |
2752 | static struct page * | |
2753 | __alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order, | |
a9263751 VB |
2754 | int alloc_flags, const struct alloc_context *ac, |
2755 | enum migrate_mode mode, int *contended_compaction, | |
2756 | bool *deferred_compaction) | |
56de7263 | 2757 | { |
53853e2d | 2758 | unsigned long compact_result; |
98dd3b48 | 2759 | struct page *page; |
53853e2d VB |
2760 | |
2761 | if (!order) | |
66199712 | 2762 | return NULL; |
66199712 | 2763 | |
c06b1fca | 2764 | current->flags |= PF_MEMALLOC; |
1a6d53a1 VB |
2765 | compact_result = try_to_compact_pages(gfp_mask, order, alloc_flags, ac, |
2766 | mode, contended_compaction); | |
c06b1fca | 2767 | current->flags &= ~PF_MEMALLOC; |
56de7263 | 2768 | |
98dd3b48 VB |
2769 | switch (compact_result) { |
2770 | case COMPACT_DEFERRED: | |
53853e2d | 2771 | *deferred_compaction = true; |
98dd3b48 VB |
2772 | /* fall-through */ |
2773 | case COMPACT_SKIPPED: | |
2774 | return NULL; | |
2775 | default: | |
2776 | break; | |
2777 | } | |
53853e2d | 2778 | |
98dd3b48 VB |
2779 | /* |
2780 | * At least in one zone compaction wasn't deferred or skipped, so let's | |
2781 | * count a compaction stall | |
2782 | */ | |
2783 | count_vm_event(COMPACTSTALL); | |
8fb74b9f | 2784 | |
a9263751 VB |
2785 | page = get_page_from_freelist(gfp_mask, order, |
2786 | alloc_flags & ~ALLOC_NO_WATERMARKS, ac); | |
53853e2d | 2787 | |
98dd3b48 VB |
2788 | if (page) { |
2789 | struct zone *zone = page_zone(page); | |
53853e2d | 2790 | |
98dd3b48 VB |
2791 | zone->compact_blockskip_flush = false; |
2792 | compaction_defer_reset(zone, order, true); | |
2793 | count_vm_event(COMPACTSUCCESS); | |
2794 | return page; | |
2795 | } | |
56de7263 | 2796 | |
98dd3b48 VB |
2797 | /* |
2798 | * It's bad if compaction run occurs and fails. The most likely reason | |
2799 | * is that pages exist, but not enough to satisfy watermarks. | |
2800 | */ | |
2801 | count_vm_event(COMPACTFAIL); | |
66199712 | 2802 | |
98dd3b48 | 2803 | cond_resched(); |
56de7263 MG |
2804 | |
2805 | return NULL; | |
2806 | } | |
2807 | #else | |
2808 | static inline struct page * | |
2809 | __alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order, | |
a9263751 VB |
2810 | int alloc_flags, const struct alloc_context *ac, |
2811 | enum migrate_mode mode, int *contended_compaction, | |
2812 | bool *deferred_compaction) | |
56de7263 MG |
2813 | { |
2814 | return NULL; | |
2815 | } | |
2816 | #endif /* CONFIG_COMPACTION */ | |
2817 | ||
bba90710 MS |
2818 | /* Perform direct synchronous page reclaim */ |
2819 | static int | |
a9263751 VB |
2820 | __perform_reclaim(gfp_t gfp_mask, unsigned int order, |
2821 | const struct alloc_context *ac) | |
11e33f6a | 2822 | { |
11e33f6a | 2823 | struct reclaim_state reclaim_state; |
bba90710 | 2824 | int progress; |
11e33f6a MG |
2825 | |
2826 | cond_resched(); | |
2827 | ||
2828 | /* We now go into synchronous reclaim */ | |
2829 | cpuset_memory_pressure_bump(); | |
c06b1fca | 2830 | current->flags |= PF_MEMALLOC; |
11e33f6a MG |
2831 | lockdep_set_current_reclaim_state(gfp_mask); |
2832 | reclaim_state.reclaimed_slab = 0; | |
c06b1fca | 2833 | current->reclaim_state = &reclaim_state; |
11e33f6a | 2834 | |
a9263751 VB |
2835 | progress = try_to_free_pages(ac->zonelist, order, gfp_mask, |
2836 | ac->nodemask); | |
11e33f6a | 2837 | |
c06b1fca | 2838 | current->reclaim_state = NULL; |
11e33f6a | 2839 | lockdep_clear_current_reclaim_state(); |
c06b1fca | 2840 | current->flags &= ~PF_MEMALLOC; |
11e33f6a MG |
2841 | |
2842 | cond_resched(); | |
2843 | ||
bba90710 MS |
2844 | return progress; |
2845 | } | |
2846 | ||
2847 | /* The really slow allocator path where we enter direct reclaim */ | |
2848 | static inline struct page * | |
2849 | __alloc_pages_direct_reclaim(gfp_t gfp_mask, unsigned int order, | |
a9263751 VB |
2850 | int alloc_flags, const struct alloc_context *ac, |
2851 | unsigned long *did_some_progress) | |
bba90710 MS |
2852 | { |
2853 | struct page *page = NULL; | |
2854 | bool drained = false; | |
2855 | ||
a9263751 | 2856 | *did_some_progress = __perform_reclaim(gfp_mask, order, ac); |
9ee493ce MG |
2857 | if (unlikely(!(*did_some_progress))) |
2858 | return NULL; | |
11e33f6a | 2859 | |
9ee493ce | 2860 | retry: |
a9263751 VB |
2861 | page = get_page_from_freelist(gfp_mask, order, |
2862 | alloc_flags & ~ALLOC_NO_WATERMARKS, ac); | |
9ee493ce MG |
2863 | |
2864 | /* | |
2865 | * If an allocation failed after direct reclaim, it could be because | |
0aaa29a5 MG |
2866 | * pages are pinned on the per-cpu lists or in high alloc reserves. |
2867 | * Shrink them them and try again | |
9ee493ce MG |
2868 | */ |
2869 | if (!page && !drained) { | |
0aaa29a5 | 2870 | unreserve_highatomic_pageblock(ac); |
93481ff0 | 2871 | drain_all_pages(NULL); |
9ee493ce MG |
2872 | drained = true; |
2873 | goto retry; | |
2874 | } | |
2875 | ||
11e33f6a MG |
2876 | return page; |
2877 | } | |
2878 | ||
1da177e4 | 2879 | /* |
11e33f6a MG |
2880 | * This is called in the allocator slow-path if the allocation request is of |
2881 | * sufficient urgency to ignore watermarks and take other desperate measures | |
1da177e4 | 2882 | */ |
11e33f6a MG |
2883 | static inline struct page * |
2884 | __alloc_pages_high_priority(gfp_t gfp_mask, unsigned int order, | |
a9263751 | 2885 | const struct alloc_context *ac) |
11e33f6a MG |
2886 | { |
2887 | struct page *page; | |
2888 | ||
2889 | do { | |
a9263751 VB |
2890 | page = get_page_from_freelist(gfp_mask, order, |
2891 | ALLOC_NO_WATERMARKS, ac); | |
11e33f6a MG |
2892 | |
2893 | if (!page && gfp_mask & __GFP_NOFAIL) | |
a9263751 VB |
2894 | wait_iff_congested(ac->preferred_zone, BLK_RW_ASYNC, |
2895 | HZ/50); | |
11e33f6a MG |
2896 | } while (!page && (gfp_mask & __GFP_NOFAIL)); |
2897 | ||
2898 | return page; | |
2899 | } | |
2900 | ||
a9263751 | 2901 | static void wake_all_kswapds(unsigned int order, const struct alloc_context *ac) |
3a025760 JW |
2902 | { |
2903 | struct zoneref *z; | |
2904 | struct zone *zone; | |
2905 | ||
a9263751 VB |
2906 | for_each_zone_zonelist_nodemask(zone, z, ac->zonelist, |
2907 | ac->high_zoneidx, ac->nodemask) | |
2908 | wakeup_kswapd(zone, order, zone_idx(ac->preferred_zone)); | |
3a025760 JW |
2909 | } |
2910 | ||
341ce06f PZ |
2911 | static inline int |
2912 | gfp_to_alloc_flags(gfp_t gfp_mask) | |
2913 | { | |
341ce06f | 2914 | int alloc_flags = ALLOC_WMARK_MIN | ALLOC_CPUSET; |
1da177e4 | 2915 | |
a56f57ff | 2916 | /* __GFP_HIGH is assumed to be the same as ALLOC_HIGH to save a branch. */ |
e6223a3b | 2917 | BUILD_BUG_ON(__GFP_HIGH != (__force gfp_t) ALLOC_HIGH); |
933e312e | 2918 | |
341ce06f PZ |
2919 | /* |
2920 | * The caller may dip into page reserves a bit more if the caller | |
2921 | * cannot run direct reclaim, or if the caller has realtime scheduling | |
2922 | * policy or is asking for __GFP_HIGH memory. GFP_ATOMIC requests will | |
d0164adc | 2923 | * set both ALLOC_HARDER (__GFP_ATOMIC) and ALLOC_HIGH (__GFP_HIGH). |
341ce06f | 2924 | */ |
e6223a3b | 2925 | alloc_flags |= (__force int) (gfp_mask & __GFP_HIGH); |
1da177e4 | 2926 | |
d0164adc | 2927 | if (gfp_mask & __GFP_ATOMIC) { |
5c3240d9 | 2928 | /* |
b104a35d DR |
2929 | * Not worth trying to allocate harder for __GFP_NOMEMALLOC even |
2930 | * if it can't schedule. | |
5c3240d9 | 2931 | */ |
b104a35d | 2932 | if (!(gfp_mask & __GFP_NOMEMALLOC)) |
5c3240d9 | 2933 | alloc_flags |= ALLOC_HARDER; |
523b9458 | 2934 | /* |
b104a35d | 2935 | * Ignore cpuset mems for GFP_ATOMIC rather than fail, see the |
344736f2 | 2936 | * comment for __cpuset_node_allowed(). |
523b9458 | 2937 | */ |
341ce06f | 2938 | alloc_flags &= ~ALLOC_CPUSET; |
c06b1fca | 2939 | } else if (unlikely(rt_task(current)) && !in_interrupt()) |
341ce06f PZ |
2940 | alloc_flags |= ALLOC_HARDER; |
2941 | ||
b37f1dd0 MG |
2942 | if (likely(!(gfp_mask & __GFP_NOMEMALLOC))) { |
2943 | if (gfp_mask & __GFP_MEMALLOC) | |
2944 | alloc_flags |= ALLOC_NO_WATERMARKS; | |
907aed48 MG |
2945 | else if (in_serving_softirq() && (current->flags & PF_MEMALLOC)) |
2946 | alloc_flags |= ALLOC_NO_WATERMARKS; | |
2947 | else if (!in_interrupt() && | |
2948 | ((current->flags & PF_MEMALLOC) || | |
2949 | unlikely(test_thread_flag(TIF_MEMDIE)))) | |
341ce06f | 2950 | alloc_flags |= ALLOC_NO_WATERMARKS; |
1da177e4 | 2951 | } |
d95ea5d1 | 2952 | #ifdef CONFIG_CMA |
43e7a34d | 2953 | if (gfpflags_to_migratetype(gfp_mask) == MIGRATE_MOVABLE) |
d95ea5d1 BZ |
2954 | alloc_flags |= ALLOC_CMA; |
2955 | #endif | |
341ce06f PZ |
2956 | return alloc_flags; |
2957 | } | |
2958 | ||
072bb0aa MG |
2959 | bool gfp_pfmemalloc_allowed(gfp_t gfp_mask) |
2960 | { | |
b37f1dd0 | 2961 | return !!(gfp_to_alloc_flags(gfp_mask) & ALLOC_NO_WATERMARKS); |
072bb0aa MG |
2962 | } |
2963 | ||
d0164adc MG |
2964 | static inline bool is_thp_gfp_mask(gfp_t gfp_mask) |
2965 | { | |
2966 | return (gfp_mask & (GFP_TRANSHUGE | __GFP_KSWAPD_RECLAIM)) == GFP_TRANSHUGE; | |
2967 | } | |
2968 | ||
11e33f6a MG |
2969 | static inline struct page * |
2970 | __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order, | |
a9263751 | 2971 | struct alloc_context *ac) |
11e33f6a | 2972 | { |
d0164adc | 2973 | bool can_direct_reclaim = gfp_mask & __GFP_DIRECT_RECLAIM; |
11e33f6a MG |
2974 | struct page *page = NULL; |
2975 | int alloc_flags; | |
2976 | unsigned long pages_reclaimed = 0; | |
2977 | unsigned long did_some_progress; | |
e0b9daeb | 2978 | enum migrate_mode migration_mode = MIGRATE_ASYNC; |
66199712 | 2979 | bool deferred_compaction = false; |
1f9efdef | 2980 | int contended_compaction = COMPACT_CONTENDED_NONE; |
1da177e4 | 2981 | |
72807a74 MG |
2982 | /* |
2983 | * In the slowpath, we sanity check order to avoid ever trying to | |
2984 | * reclaim >= MAX_ORDER areas which will never succeed. Callers may | |
2985 | * be using allocators in order of preference for an area that is | |
2986 | * too large. | |
2987 | */ | |
1fc28b70 MG |
2988 | if (order >= MAX_ORDER) { |
2989 | WARN_ON_ONCE(!(gfp_mask & __GFP_NOWARN)); | |
72807a74 | 2990 | return NULL; |
1fc28b70 | 2991 | } |
1da177e4 | 2992 | |
d0164adc MG |
2993 | /* |
2994 | * We also sanity check to catch abuse of atomic reserves being used by | |
2995 | * callers that are not in atomic context. | |
2996 | */ | |
2997 | if (WARN_ON_ONCE((gfp_mask & (__GFP_ATOMIC|__GFP_DIRECT_RECLAIM)) == | |
2998 | (__GFP_ATOMIC|__GFP_DIRECT_RECLAIM))) | |
2999 | gfp_mask &= ~__GFP_ATOMIC; | |
3000 | ||
952f3b51 | 3001 | /* |
4167e9b2 DR |
3002 | * If this allocation cannot block and it is for a specific node, then |
3003 | * fail early. There's no need to wakeup kswapd or retry for a | |
3004 | * speculative node-specific allocation. | |
952f3b51 | 3005 | */ |
d0164adc | 3006 | if (IS_ENABLED(CONFIG_NUMA) && (gfp_mask & __GFP_THISNODE) && !can_direct_reclaim) |
952f3b51 CL |
3007 | goto nopage; |
3008 | ||
9879de73 | 3009 | retry: |
d0164adc | 3010 | if (gfp_mask & __GFP_KSWAPD_RECLAIM) |
a9263751 | 3011 | wake_all_kswapds(order, ac); |
1da177e4 | 3012 | |
9bf2229f | 3013 | /* |
7fb1d9fc RS |
3014 | * OK, we're below the kswapd watermark and have kicked background |
3015 | * reclaim. Now things get more complex, so set up alloc_flags according | |
3016 | * to how we want to proceed. | |
9bf2229f | 3017 | */ |
341ce06f | 3018 | alloc_flags = gfp_to_alloc_flags(gfp_mask); |
1da177e4 | 3019 | |
f33261d7 DR |
3020 | /* |
3021 | * Find the true preferred zone if the allocation is unconstrained by | |
3022 | * cpusets. | |
3023 | */ | |
a9263751 | 3024 | if (!(alloc_flags & ALLOC_CPUSET) && !ac->nodemask) { |
d8846374 | 3025 | struct zoneref *preferred_zoneref; |
a9263751 VB |
3026 | preferred_zoneref = first_zones_zonelist(ac->zonelist, |
3027 | ac->high_zoneidx, NULL, &ac->preferred_zone); | |
3028 | ac->classzone_idx = zonelist_zone_idx(preferred_zoneref); | |
d8846374 | 3029 | } |
f33261d7 | 3030 | |
341ce06f | 3031 | /* This is the last chance, in general, before the goto nopage. */ |
a9263751 VB |
3032 | page = get_page_from_freelist(gfp_mask, order, |
3033 | alloc_flags & ~ALLOC_NO_WATERMARKS, ac); | |
7fb1d9fc RS |
3034 | if (page) |
3035 | goto got_pg; | |
1da177e4 | 3036 | |
11e33f6a | 3037 | /* Allocate without watermarks if the context allows */ |
341ce06f | 3038 | if (alloc_flags & ALLOC_NO_WATERMARKS) { |
183f6371 MG |
3039 | /* |
3040 | * Ignore mempolicies if ALLOC_NO_WATERMARKS on the grounds | |
3041 | * the allocation is high priority and these type of | |
3042 | * allocations are system rather than user orientated | |
3043 | */ | |
a9263751 VB |
3044 | ac->zonelist = node_zonelist(numa_node_id(), gfp_mask); |
3045 | ||
3046 | page = __alloc_pages_high_priority(gfp_mask, order, ac); | |
183f6371 | 3047 | |
cfd19c5a | 3048 | if (page) { |
341ce06f | 3049 | goto got_pg; |
cfd19c5a | 3050 | } |
1da177e4 LT |
3051 | } |
3052 | ||
d0164adc MG |
3053 | /* Caller is not willing to reclaim, we can't balance anything */ |
3054 | if (!can_direct_reclaim) { | |
aed0a0e3 DR |
3055 | /* |
3056 | * All existing users of the deprecated __GFP_NOFAIL are | |
3057 | * blockable, so warn of any new users that actually allow this | |
3058 | * type of allocation to fail. | |
3059 | */ | |
3060 | WARN_ON_ONCE(gfp_mask & __GFP_NOFAIL); | |
1da177e4 | 3061 | goto nopage; |
aed0a0e3 | 3062 | } |
1da177e4 | 3063 | |
341ce06f | 3064 | /* Avoid recursion of direct reclaim */ |
c06b1fca | 3065 | if (current->flags & PF_MEMALLOC) |
341ce06f PZ |
3066 | goto nopage; |
3067 | ||
6583bb64 DR |
3068 | /* Avoid allocations with no watermarks from looping endlessly */ |
3069 | if (test_thread_flag(TIF_MEMDIE) && !(gfp_mask & __GFP_NOFAIL)) | |
3070 | goto nopage; | |
3071 | ||
77f1fe6b MG |
3072 | /* |
3073 | * Try direct compaction. The first pass is asynchronous. Subsequent | |
3074 | * attempts after direct reclaim are synchronous | |
3075 | */ | |
a9263751 VB |
3076 | page = __alloc_pages_direct_compact(gfp_mask, order, alloc_flags, ac, |
3077 | migration_mode, | |
3078 | &contended_compaction, | |
53853e2d | 3079 | &deferred_compaction); |
56de7263 MG |
3080 | if (page) |
3081 | goto got_pg; | |
75f30861 | 3082 | |
1f9efdef | 3083 | /* Checks for THP-specific high-order allocations */ |
d0164adc | 3084 | if (is_thp_gfp_mask(gfp_mask)) { |
1f9efdef VB |
3085 | /* |
3086 | * If compaction is deferred for high-order allocations, it is | |
3087 | * because sync compaction recently failed. If this is the case | |
3088 | * and the caller requested a THP allocation, we do not want | |
3089 | * to heavily disrupt the system, so we fail the allocation | |
3090 | * instead of entering direct reclaim. | |
3091 | */ | |
3092 | if (deferred_compaction) | |
3093 | goto nopage; | |
3094 | ||
3095 | /* | |
3096 | * In all zones where compaction was attempted (and not | |
3097 | * deferred or skipped), lock contention has been detected. | |
3098 | * For THP allocation we do not want to disrupt the others | |
3099 | * so we fallback to base pages instead. | |
3100 | */ | |
3101 | if (contended_compaction == COMPACT_CONTENDED_LOCK) | |
3102 | goto nopage; | |
3103 | ||
3104 | /* | |
3105 | * If compaction was aborted due to need_resched(), we do not | |
3106 | * want to further increase allocation latency, unless it is | |
3107 | * khugepaged trying to collapse. | |
3108 | */ | |
3109 | if (contended_compaction == COMPACT_CONTENDED_SCHED | |
3110 | && !(current->flags & PF_KTHREAD)) | |
3111 | goto nopage; | |
3112 | } | |
66199712 | 3113 | |
8fe78048 DR |
3114 | /* |
3115 | * It can become very expensive to allocate transparent hugepages at | |
3116 | * fault, so use asynchronous memory compaction for THP unless it is | |
3117 | * khugepaged trying to collapse. | |
3118 | */ | |
d0164adc | 3119 | if (!is_thp_gfp_mask(gfp_mask) || (current->flags & PF_KTHREAD)) |
8fe78048 DR |
3120 | migration_mode = MIGRATE_SYNC_LIGHT; |
3121 | ||
11e33f6a | 3122 | /* Try direct reclaim and then allocating */ |
a9263751 VB |
3123 | page = __alloc_pages_direct_reclaim(gfp_mask, order, alloc_flags, ac, |
3124 | &did_some_progress); | |
11e33f6a MG |
3125 | if (page) |
3126 | goto got_pg; | |
1da177e4 | 3127 | |
9083905a JW |
3128 | /* Do not loop if specifically requested */ |
3129 | if (gfp_mask & __GFP_NORETRY) | |
3130 | goto noretry; | |
3131 | ||
3132 | /* Keep reclaiming pages as long as there is reasonable progress */ | |
a41f24ea | 3133 | pages_reclaimed += did_some_progress; |
9083905a JW |
3134 | if ((did_some_progress && order <= PAGE_ALLOC_COSTLY_ORDER) || |
3135 | ((gfp_mask & __GFP_REPEAT) && pages_reclaimed < (1 << order))) { | |
11e33f6a | 3136 | /* Wait for some write requests to complete then retry */ |
a9263751 | 3137 | wait_iff_congested(ac->preferred_zone, BLK_RW_ASYNC, HZ/50); |
9879de73 | 3138 | goto retry; |
1da177e4 LT |
3139 | } |
3140 | ||
9083905a JW |
3141 | /* Reclaim has failed us, start killing things */ |
3142 | page = __alloc_pages_may_oom(gfp_mask, order, ac, &did_some_progress); | |
3143 | if (page) | |
3144 | goto got_pg; | |
3145 | ||
3146 | /* Retry as long as the OOM killer is making progress */ | |
3147 | if (did_some_progress) | |
3148 | goto retry; | |
3149 | ||
3150 | noretry: | |
3151 | /* | |
3152 | * High-order allocations do not necessarily loop after | |
3153 | * direct reclaim and reclaim/compaction depends on compaction | |
3154 | * being called after reclaim so call directly if necessary | |
3155 | */ | |
3156 | page = __alloc_pages_direct_compact(gfp_mask, order, alloc_flags, | |
3157 | ac, migration_mode, | |
3158 | &contended_compaction, | |
3159 | &deferred_compaction); | |
3160 | if (page) | |
3161 | goto got_pg; | |
1da177e4 | 3162 | nopage: |
a238ab5b | 3163 | warn_alloc_failed(gfp_mask, order, NULL); |
1da177e4 | 3164 | got_pg: |
072bb0aa | 3165 | return page; |
1da177e4 | 3166 | } |
11e33f6a MG |
3167 | |
3168 | /* | |
3169 | * This is the 'heart' of the zoned buddy allocator. | |
3170 | */ | |
3171 | struct page * | |
3172 | __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order, | |
3173 | struct zonelist *zonelist, nodemask_t *nodemask) | |
3174 | { | |
d8846374 | 3175 | struct zoneref *preferred_zoneref; |
cc9a6c87 | 3176 | struct page *page = NULL; |
cc9a6c87 | 3177 | unsigned int cpuset_mems_cookie; |
3a025760 | 3178 | int alloc_flags = ALLOC_WMARK_LOW|ALLOC_CPUSET|ALLOC_FAIR; |
91fbdc0f | 3179 | gfp_t alloc_mask; /* The gfp_t that was actually used for allocation */ |
a9263751 VB |
3180 | struct alloc_context ac = { |
3181 | .high_zoneidx = gfp_zone(gfp_mask), | |
3182 | .nodemask = nodemask, | |
3183 | .migratetype = gfpflags_to_migratetype(gfp_mask), | |
3184 | }; | |
11e33f6a | 3185 | |
dcce284a BH |
3186 | gfp_mask &= gfp_allowed_mask; |
3187 | ||
11e33f6a MG |
3188 | lockdep_trace_alloc(gfp_mask); |
3189 | ||
d0164adc | 3190 | might_sleep_if(gfp_mask & __GFP_DIRECT_RECLAIM); |
11e33f6a MG |
3191 | |
3192 | if (should_fail_alloc_page(gfp_mask, order)) | |
3193 | return NULL; | |
3194 | ||
3195 | /* | |
3196 | * Check the zones suitable for the gfp_mask contain at least one | |
3197 | * valid zone. It's possible to have an empty zonelist as a result | |
4167e9b2 | 3198 | * of __GFP_THISNODE and a memoryless node |
11e33f6a MG |
3199 | */ |
3200 | if (unlikely(!zonelist->_zonerefs->zone)) | |
3201 | return NULL; | |
3202 | ||
a9263751 | 3203 | if (IS_ENABLED(CONFIG_CMA) && ac.migratetype == MIGRATE_MOVABLE) |
21bb9bd1 VB |
3204 | alloc_flags |= ALLOC_CMA; |
3205 | ||
cc9a6c87 | 3206 | retry_cpuset: |
d26914d1 | 3207 | cpuset_mems_cookie = read_mems_allowed_begin(); |
cc9a6c87 | 3208 | |
a9263751 VB |
3209 | /* We set it here, as __alloc_pages_slowpath might have changed it */ |
3210 | ac.zonelist = zonelist; | |
c9ab0c4f MG |
3211 | |
3212 | /* Dirty zone balancing only done in the fast path */ | |
3213 | ac.spread_dirty_pages = (gfp_mask & __GFP_WRITE); | |
3214 | ||
5117f45d | 3215 | /* The preferred zone is used for statistics later */ |
a9263751 VB |
3216 | preferred_zoneref = first_zones_zonelist(ac.zonelist, ac.high_zoneidx, |
3217 | ac.nodemask ? : &cpuset_current_mems_allowed, | |
3218 | &ac.preferred_zone); | |
3219 | if (!ac.preferred_zone) | |
cc9a6c87 | 3220 | goto out; |
a9263751 | 3221 | ac.classzone_idx = zonelist_zone_idx(preferred_zoneref); |
5117f45d MG |
3222 | |
3223 | /* First allocation attempt */ | |
91fbdc0f | 3224 | alloc_mask = gfp_mask|__GFP_HARDWALL; |
a9263751 | 3225 | page = get_page_from_freelist(alloc_mask, order, alloc_flags, &ac); |
21caf2fc ML |
3226 | if (unlikely(!page)) { |
3227 | /* | |
3228 | * Runtime PM, block IO and its error handling path | |
3229 | * can deadlock because I/O on the device might not | |
3230 | * complete. | |
3231 | */ | |
91fbdc0f | 3232 | alloc_mask = memalloc_noio_flags(gfp_mask); |
c9ab0c4f | 3233 | ac.spread_dirty_pages = false; |
91fbdc0f | 3234 | |
a9263751 | 3235 | page = __alloc_pages_slowpath(alloc_mask, order, &ac); |
21caf2fc | 3236 | } |
11e33f6a | 3237 | |
23f086f9 XQ |
3238 | if (kmemcheck_enabled && page) |
3239 | kmemcheck_pagealloc_alloc(page, order, gfp_mask); | |
3240 | ||
a9263751 | 3241 | trace_mm_page_alloc(page, order, alloc_mask, ac.migratetype); |
cc9a6c87 MG |
3242 | |
3243 | out: | |
3244 | /* | |
3245 | * When updating a task's mems_allowed, it is possible to race with | |
3246 | * parallel threads in such a way that an allocation can fail while | |
3247 | * the mask is being updated. If a page allocation is about to fail, | |
3248 | * check if the cpuset changed during allocation and if so, retry. | |
3249 | */ | |
d26914d1 | 3250 | if (unlikely(!page && read_mems_allowed_retry(cpuset_mems_cookie))) |
cc9a6c87 MG |
3251 | goto retry_cpuset; |
3252 | ||
11e33f6a | 3253 | return page; |
1da177e4 | 3254 | } |
d239171e | 3255 | EXPORT_SYMBOL(__alloc_pages_nodemask); |
1da177e4 LT |
3256 | |
3257 | /* | |
3258 | * Common helper functions. | |
3259 | */ | |
920c7a5d | 3260 | unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order) |
1da177e4 | 3261 | { |
945a1113 AM |
3262 | struct page *page; |
3263 | ||
3264 | /* | |
3265 | * __get_free_pages() returns a 32-bit address, which cannot represent | |
3266 | * a highmem page | |
3267 | */ | |
3268 | VM_BUG_ON((gfp_mask & __GFP_HIGHMEM) != 0); | |
3269 | ||
1da177e4 LT |
3270 | page = alloc_pages(gfp_mask, order); |
3271 | if (!page) | |
3272 | return 0; | |
3273 | return (unsigned long) page_address(page); | |
3274 | } | |
1da177e4 LT |
3275 | EXPORT_SYMBOL(__get_free_pages); |
3276 | ||
920c7a5d | 3277 | unsigned long get_zeroed_page(gfp_t gfp_mask) |
1da177e4 | 3278 | { |
945a1113 | 3279 | return __get_free_pages(gfp_mask | __GFP_ZERO, 0); |
1da177e4 | 3280 | } |
1da177e4 LT |
3281 | EXPORT_SYMBOL(get_zeroed_page); |
3282 | ||
920c7a5d | 3283 | void __free_pages(struct page *page, unsigned int order) |
1da177e4 | 3284 | { |
b5810039 | 3285 | if (put_page_testzero(page)) { |
1da177e4 | 3286 | if (order == 0) |
b745bc85 | 3287 | free_hot_cold_page(page, false); |
1da177e4 LT |
3288 | else |
3289 | __free_pages_ok(page, order); | |
3290 | } | |
3291 | } | |
3292 | ||
3293 | EXPORT_SYMBOL(__free_pages); | |
3294 | ||
920c7a5d | 3295 | void free_pages(unsigned long addr, unsigned int order) |
1da177e4 LT |
3296 | { |
3297 | if (addr != 0) { | |
725d704e | 3298 | VM_BUG_ON(!virt_addr_valid((void *)addr)); |
1da177e4 LT |
3299 | __free_pages(virt_to_page((void *)addr), order); |
3300 | } | |
3301 | } | |
3302 | ||
3303 | EXPORT_SYMBOL(free_pages); | |
3304 | ||
b63ae8ca AD |
3305 | /* |
3306 | * Page Fragment: | |
3307 | * An arbitrary-length arbitrary-offset area of memory which resides | |
3308 | * within a 0 or higher order page. Multiple fragments within that page | |
3309 | * are individually refcounted, in the page's reference counter. | |
3310 | * | |
3311 | * The page_frag functions below provide a simple allocation framework for | |
3312 | * page fragments. This is used by the network stack and network device | |
3313 | * drivers to provide a backing region of memory for use as either an | |
3314 | * sk_buff->head, or to be used in the "frags" portion of skb_shared_info. | |
3315 | */ | |
3316 | static struct page *__page_frag_refill(struct page_frag_cache *nc, | |
3317 | gfp_t gfp_mask) | |
3318 | { | |
3319 | struct page *page = NULL; | |
3320 | gfp_t gfp = gfp_mask; | |
3321 | ||
3322 | #if (PAGE_SIZE < PAGE_FRAG_CACHE_MAX_SIZE) | |
3323 | gfp_mask |= __GFP_COMP | __GFP_NOWARN | __GFP_NORETRY | | |
3324 | __GFP_NOMEMALLOC; | |
3325 | page = alloc_pages_node(NUMA_NO_NODE, gfp_mask, | |
3326 | PAGE_FRAG_CACHE_MAX_ORDER); | |
3327 | nc->size = page ? PAGE_FRAG_CACHE_MAX_SIZE : PAGE_SIZE; | |
3328 | #endif | |
3329 | if (unlikely(!page)) | |
3330 | page = alloc_pages_node(NUMA_NO_NODE, gfp, 0); | |
3331 | ||
3332 | nc->va = page ? page_address(page) : NULL; | |
3333 | ||
3334 | return page; | |
3335 | } | |
3336 | ||
3337 | void *__alloc_page_frag(struct page_frag_cache *nc, | |
3338 | unsigned int fragsz, gfp_t gfp_mask) | |
3339 | { | |
3340 | unsigned int size = PAGE_SIZE; | |
3341 | struct page *page; | |
3342 | int offset; | |
3343 | ||
3344 | if (unlikely(!nc->va)) { | |
3345 | refill: | |
3346 | page = __page_frag_refill(nc, gfp_mask); | |
3347 | if (!page) | |
3348 | return NULL; | |
3349 | ||
3350 | #if (PAGE_SIZE < PAGE_FRAG_CACHE_MAX_SIZE) | |
3351 | /* if size can vary use size else just use PAGE_SIZE */ | |
3352 | size = nc->size; | |
3353 | #endif | |
3354 | /* Even if we own the page, we do not use atomic_set(). | |
3355 | * This would break get_page_unless_zero() users. | |
3356 | */ | |
3357 | atomic_add(size - 1, &page->_count); | |
3358 | ||
3359 | /* reset page count bias and offset to start of new frag */ | |
2f064f34 | 3360 | nc->pfmemalloc = page_is_pfmemalloc(page); |
b63ae8ca AD |
3361 | nc->pagecnt_bias = size; |
3362 | nc->offset = size; | |
3363 | } | |
3364 | ||
3365 | offset = nc->offset - fragsz; | |
3366 | if (unlikely(offset < 0)) { | |
3367 | page = virt_to_page(nc->va); | |
3368 | ||
3369 | if (!atomic_sub_and_test(nc->pagecnt_bias, &page->_count)) | |
3370 | goto refill; | |
3371 | ||
3372 | #if (PAGE_SIZE < PAGE_FRAG_CACHE_MAX_SIZE) | |
3373 | /* if size can vary use size else just use PAGE_SIZE */ | |
3374 | size = nc->size; | |
3375 | #endif | |
3376 | /* OK, page count is 0, we can safely set it */ | |
3377 | atomic_set(&page->_count, size); | |
3378 | ||
3379 | /* reset page count bias and offset to start of new frag */ | |
3380 | nc->pagecnt_bias = size; | |
3381 | offset = size - fragsz; | |
3382 | } | |
3383 | ||
3384 | nc->pagecnt_bias--; | |
3385 | nc->offset = offset; | |
3386 | ||
3387 | return nc->va + offset; | |
3388 | } | |
3389 | EXPORT_SYMBOL(__alloc_page_frag); | |
3390 | ||
3391 | /* | |
3392 | * Frees a page fragment allocated out of either a compound or order 0 page. | |
3393 | */ | |
3394 | void __free_page_frag(void *addr) | |
3395 | { | |
3396 | struct page *page = virt_to_head_page(addr); | |
3397 | ||
3398 | if (unlikely(put_page_testzero(page))) | |
3399 | __free_pages_ok(page, compound_order(page)); | |
3400 | } | |
3401 | EXPORT_SYMBOL(__free_page_frag); | |
3402 | ||
6a1a0d3b | 3403 | /* |
52383431 VD |
3404 | * alloc_kmem_pages charges newly allocated pages to the kmem resource counter |
3405 | * of the current memory cgroup. | |
6a1a0d3b | 3406 | * |
52383431 VD |
3407 | * It should be used when the caller would like to use kmalloc, but since the |
3408 | * allocation is large, it has to fall back to the page allocator. | |
3409 | */ | |
3410 | struct page *alloc_kmem_pages(gfp_t gfp_mask, unsigned int order) | |
3411 | { | |
3412 | struct page *page; | |
52383431 | 3413 | |
52383431 | 3414 | page = alloc_pages(gfp_mask, order); |
d05e83a6 VD |
3415 | if (page && memcg_kmem_charge(page, gfp_mask, order) != 0) { |
3416 | __free_pages(page, order); | |
3417 | page = NULL; | |
3418 | } | |
52383431 VD |
3419 | return page; |
3420 | } | |
3421 | ||
3422 | struct page *alloc_kmem_pages_node(int nid, gfp_t gfp_mask, unsigned int order) | |
3423 | { | |
3424 | struct page *page; | |
52383431 | 3425 | |
52383431 | 3426 | page = alloc_pages_node(nid, gfp_mask, order); |
d05e83a6 VD |
3427 | if (page && memcg_kmem_charge(page, gfp_mask, order) != 0) { |
3428 | __free_pages(page, order); | |
3429 | page = NULL; | |
3430 | } | |
52383431 VD |
3431 | return page; |
3432 | } | |
3433 | ||
3434 | /* | |
3435 | * __free_kmem_pages and free_kmem_pages will free pages allocated with | |
3436 | * alloc_kmem_pages. | |
6a1a0d3b | 3437 | */ |
52383431 | 3438 | void __free_kmem_pages(struct page *page, unsigned int order) |
6a1a0d3b | 3439 | { |
d05e83a6 | 3440 | memcg_kmem_uncharge(page, order); |
6a1a0d3b GC |
3441 | __free_pages(page, order); |
3442 | } | |
3443 | ||
52383431 | 3444 | void free_kmem_pages(unsigned long addr, unsigned int order) |
6a1a0d3b GC |
3445 | { |
3446 | if (addr != 0) { | |
3447 | VM_BUG_ON(!virt_addr_valid((void *)addr)); | |
52383431 | 3448 | __free_kmem_pages(virt_to_page((void *)addr), order); |
6a1a0d3b GC |
3449 | } |
3450 | } | |
3451 | ||
d00181b9 KS |
3452 | static void *make_alloc_exact(unsigned long addr, unsigned int order, |
3453 | size_t size) | |
ee85c2e1 AK |
3454 | { |
3455 | if (addr) { | |
3456 | unsigned long alloc_end = addr + (PAGE_SIZE << order); | |
3457 | unsigned long used = addr + PAGE_ALIGN(size); | |
3458 | ||
3459 | split_page(virt_to_page((void *)addr), order); | |
3460 | while (used < alloc_end) { | |
3461 | free_page(used); | |
3462 | used += PAGE_SIZE; | |
3463 | } | |
3464 | } | |
3465 | return (void *)addr; | |
3466 | } | |
3467 | ||
2be0ffe2 TT |
3468 | /** |
3469 | * alloc_pages_exact - allocate an exact number physically-contiguous pages. | |
3470 | * @size: the number of bytes to allocate | |
3471 | * @gfp_mask: GFP flags for the allocation | |
3472 | * | |
3473 | * This function is similar to alloc_pages(), except that it allocates the | |
3474 | * minimum number of pages to satisfy the request. alloc_pages() can only | |
3475 | * allocate memory in power-of-two pages. | |
3476 | * | |
3477 | * This function is also limited by MAX_ORDER. | |
3478 | * | |
3479 | * Memory allocated by this function must be released by free_pages_exact(). | |
3480 | */ | |
3481 | void *alloc_pages_exact(size_t size, gfp_t gfp_mask) | |
3482 | { | |
3483 | unsigned int order = get_order(size); | |
3484 | unsigned long addr; | |
3485 | ||
3486 | addr = __get_free_pages(gfp_mask, order); | |
ee85c2e1 | 3487 | return make_alloc_exact(addr, order, size); |
2be0ffe2 TT |
3488 | } |
3489 | EXPORT_SYMBOL(alloc_pages_exact); | |
3490 | ||
ee85c2e1 AK |
3491 | /** |
3492 | * alloc_pages_exact_nid - allocate an exact number of physically-contiguous | |
3493 | * pages on a node. | |
b5e6ab58 | 3494 | * @nid: the preferred node ID where memory should be allocated |
ee85c2e1 AK |
3495 | * @size: the number of bytes to allocate |
3496 | * @gfp_mask: GFP flags for the allocation | |
3497 | * | |
3498 | * Like alloc_pages_exact(), but try to allocate on node nid first before falling | |
3499 | * back. | |
ee85c2e1 | 3500 | */ |
e1931811 | 3501 | void * __meminit alloc_pages_exact_nid(int nid, size_t size, gfp_t gfp_mask) |
ee85c2e1 | 3502 | { |
d00181b9 | 3503 | unsigned int order = get_order(size); |
ee85c2e1 AK |
3504 | struct page *p = alloc_pages_node(nid, gfp_mask, order); |
3505 | if (!p) | |
3506 | return NULL; | |
3507 | return make_alloc_exact((unsigned long)page_address(p), order, size); | |
3508 | } | |
ee85c2e1 | 3509 | |
2be0ffe2 TT |
3510 | /** |
3511 | * free_pages_exact - release memory allocated via alloc_pages_exact() | |
3512 | * @virt: the value returned by alloc_pages_exact. | |
3513 | * @size: size of allocation, same value as passed to alloc_pages_exact(). | |
3514 | * | |
3515 | * Release the memory allocated by a previous call to alloc_pages_exact. | |
3516 | */ | |
3517 | void free_pages_exact(void *virt, size_t size) | |
3518 | { | |
3519 | unsigned long addr = (unsigned long)virt; | |
3520 | unsigned long end = addr + PAGE_ALIGN(size); | |
3521 | ||
3522 | while (addr < end) { | |
3523 | free_page(addr); | |
3524 | addr += PAGE_SIZE; | |
3525 | } | |
3526 | } | |
3527 | EXPORT_SYMBOL(free_pages_exact); | |
3528 | ||
e0fb5815 ZY |
3529 | /** |
3530 | * nr_free_zone_pages - count number of pages beyond high watermark | |
3531 | * @offset: The zone index of the highest zone | |
3532 | * | |
3533 | * nr_free_zone_pages() counts the number of counts pages which are beyond the | |
3534 | * high watermark within all zones at or below a given zone index. For each | |
3535 | * zone, the number of pages is calculated as: | |
834405c3 | 3536 | * managed_pages - high_pages |
e0fb5815 | 3537 | */ |
ebec3862 | 3538 | static unsigned long nr_free_zone_pages(int offset) |
1da177e4 | 3539 | { |
dd1a239f | 3540 | struct zoneref *z; |
54a6eb5c MG |
3541 | struct zone *zone; |
3542 | ||
e310fd43 | 3543 | /* Just pick one node, since fallback list is circular */ |
ebec3862 | 3544 | unsigned long sum = 0; |
1da177e4 | 3545 | |
0e88460d | 3546 | struct zonelist *zonelist = node_zonelist(numa_node_id(), GFP_KERNEL); |
1da177e4 | 3547 | |
54a6eb5c | 3548 | for_each_zone_zonelist(zone, z, zonelist, offset) { |
b40da049 | 3549 | unsigned long size = zone->managed_pages; |
41858966 | 3550 | unsigned long high = high_wmark_pages(zone); |
e310fd43 MB |
3551 | if (size > high) |
3552 | sum += size - high; | |
1da177e4 LT |
3553 | } |
3554 | ||
3555 | return sum; | |
3556 | } | |
3557 | ||
e0fb5815 ZY |
3558 | /** |
3559 | * nr_free_buffer_pages - count number of pages beyond high watermark | |
3560 | * | |
3561 | * nr_free_buffer_pages() counts the number of pages which are beyond the high | |
3562 | * watermark within ZONE_DMA and ZONE_NORMAL. | |
1da177e4 | 3563 | */ |
ebec3862 | 3564 | unsigned long nr_free_buffer_pages(void) |
1da177e4 | 3565 | { |
af4ca457 | 3566 | return nr_free_zone_pages(gfp_zone(GFP_USER)); |
1da177e4 | 3567 | } |
c2f1a551 | 3568 | EXPORT_SYMBOL_GPL(nr_free_buffer_pages); |
1da177e4 | 3569 | |
e0fb5815 ZY |
3570 | /** |
3571 | * nr_free_pagecache_pages - count number of pages beyond high watermark | |
3572 | * | |
3573 | * nr_free_pagecache_pages() counts the number of pages which are beyond the | |
3574 | * high watermark within all zones. | |
1da177e4 | 3575 | */ |
ebec3862 | 3576 | unsigned long nr_free_pagecache_pages(void) |
1da177e4 | 3577 | { |
2a1e274a | 3578 | return nr_free_zone_pages(gfp_zone(GFP_HIGHUSER_MOVABLE)); |
1da177e4 | 3579 | } |
08e0f6a9 CL |
3580 | |
3581 | static inline void show_node(struct zone *zone) | |
1da177e4 | 3582 | { |
e5adfffc | 3583 | if (IS_ENABLED(CONFIG_NUMA)) |
25ba77c1 | 3584 | printk("Node %d ", zone_to_nid(zone)); |
1da177e4 | 3585 | } |
1da177e4 | 3586 | |
1da177e4 LT |
3587 | void si_meminfo(struct sysinfo *val) |
3588 | { | |
3589 | val->totalram = totalram_pages; | |
cc7452b6 | 3590 | val->sharedram = global_page_state(NR_SHMEM); |
d23ad423 | 3591 | val->freeram = global_page_state(NR_FREE_PAGES); |
1da177e4 | 3592 | val->bufferram = nr_blockdev_pages(); |
1da177e4 LT |
3593 | val->totalhigh = totalhigh_pages; |
3594 | val->freehigh = nr_free_highpages(); | |
1da177e4 LT |
3595 | val->mem_unit = PAGE_SIZE; |
3596 | } | |
3597 | ||
3598 | EXPORT_SYMBOL(si_meminfo); | |
3599 | ||
3600 | #ifdef CONFIG_NUMA | |
3601 | void si_meminfo_node(struct sysinfo *val, int nid) | |
3602 | { | |
cdd91a77 JL |
3603 | int zone_type; /* needs to be signed */ |
3604 | unsigned long managed_pages = 0; | |
1da177e4 LT |
3605 | pg_data_t *pgdat = NODE_DATA(nid); |
3606 | ||
cdd91a77 JL |
3607 | for (zone_type = 0; zone_type < MAX_NR_ZONES; zone_type++) |
3608 | managed_pages += pgdat->node_zones[zone_type].managed_pages; | |
3609 | val->totalram = managed_pages; | |
cc7452b6 | 3610 | val->sharedram = node_page_state(nid, NR_SHMEM); |
d23ad423 | 3611 | val->freeram = node_page_state(nid, NR_FREE_PAGES); |
98d2b0eb | 3612 | #ifdef CONFIG_HIGHMEM |
b40da049 | 3613 | val->totalhigh = pgdat->node_zones[ZONE_HIGHMEM].managed_pages; |
d23ad423 CL |
3614 | val->freehigh = zone_page_state(&pgdat->node_zones[ZONE_HIGHMEM], |
3615 | NR_FREE_PAGES); | |
98d2b0eb CL |
3616 | #else |
3617 | val->totalhigh = 0; | |
3618 | val->freehigh = 0; | |
3619 | #endif | |
1da177e4 LT |
3620 | val->mem_unit = PAGE_SIZE; |
3621 | } | |
3622 | #endif | |
3623 | ||
ddd588b5 | 3624 | /* |
7bf02ea2 DR |
3625 | * Determine whether the node should be displayed or not, depending on whether |
3626 | * SHOW_MEM_FILTER_NODES was passed to show_free_areas(). | |
ddd588b5 | 3627 | */ |
7bf02ea2 | 3628 | bool skip_free_areas_node(unsigned int flags, int nid) |
ddd588b5 DR |
3629 | { |
3630 | bool ret = false; | |
cc9a6c87 | 3631 | unsigned int cpuset_mems_cookie; |
ddd588b5 DR |
3632 | |
3633 | if (!(flags & SHOW_MEM_FILTER_NODES)) | |
3634 | goto out; | |
3635 | ||
cc9a6c87 | 3636 | do { |
d26914d1 | 3637 | cpuset_mems_cookie = read_mems_allowed_begin(); |
cc9a6c87 | 3638 | ret = !node_isset(nid, cpuset_current_mems_allowed); |
d26914d1 | 3639 | } while (read_mems_allowed_retry(cpuset_mems_cookie)); |
ddd588b5 DR |
3640 | out: |
3641 | return ret; | |
3642 | } | |
3643 | ||
1da177e4 LT |
3644 | #define K(x) ((x) << (PAGE_SHIFT-10)) |
3645 | ||
377e4f16 RV |
3646 | static void show_migration_types(unsigned char type) |
3647 | { | |
3648 | static const char types[MIGRATE_TYPES] = { | |
3649 | [MIGRATE_UNMOVABLE] = 'U', | |
3650 | [MIGRATE_RECLAIMABLE] = 'E', | |
3651 | [MIGRATE_MOVABLE] = 'M', | |
377e4f16 RV |
3652 | #ifdef CONFIG_CMA |
3653 | [MIGRATE_CMA] = 'C', | |
3654 | #endif | |
194159fb | 3655 | #ifdef CONFIG_MEMORY_ISOLATION |
377e4f16 | 3656 | [MIGRATE_ISOLATE] = 'I', |
194159fb | 3657 | #endif |
377e4f16 RV |
3658 | }; |
3659 | char tmp[MIGRATE_TYPES + 1]; | |
3660 | char *p = tmp; | |
3661 | int i; | |
3662 | ||
3663 | for (i = 0; i < MIGRATE_TYPES; i++) { | |
3664 | if (type & (1 << i)) | |
3665 | *p++ = types[i]; | |
3666 | } | |
3667 | ||
3668 | *p = '\0'; | |
3669 | printk("(%s) ", tmp); | |
3670 | } | |
3671 | ||
1da177e4 LT |
3672 | /* |
3673 | * Show free area list (used inside shift_scroll-lock stuff) | |
3674 | * We also calculate the percentage fragmentation. We do this by counting the | |
3675 | * memory on each free list with the exception of the first item on the list. | |
d1bfcdb8 KK |
3676 | * |
3677 | * Bits in @filter: | |
3678 | * SHOW_MEM_FILTER_NODES: suppress nodes that are not allowed by current's | |
3679 | * cpuset. | |
1da177e4 | 3680 | */ |
7bf02ea2 | 3681 | void show_free_areas(unsigned int filter) |
1da177e4 | 3682 | { |
d1bfcdb8 | 3683 | unsigned long free_pcp = 0; |
c7241913 | 3684 | int cpu; |
1da177e4 LT |
3685 | struct zone *zone; |
3686 | ||
ee99c71c | 3687 | for_each_populated_zone(zone) { |
7bf02ea2 | 3688 | if (skip_free_areas_node(filter, zone_to_nid(zone))) |
ddd588b5 | 3689 | continue; |
d1bfcdb8 | 3690 | |
761b0677 KK |
3691 | for_each_online_cpu(cpu) |
3692 | free_pcp += per_cpu_ptr(zone->pageset, cpu)->pcp.count; | |
1da177e4 LT |
3693 | } |
3694 | ||
a731286d KM |
3695 | printk("active_anon:%lu inactive_anon:%lu isolated_anon:%lu\n" |
3696 | " active_file:%lu inactive_file:%lu isolated_file:%lu\n" | |
d1bfcdb8 KK |
3697 | " unevictable:%lu dirty:%lu writeback:%lu unstable:%lu\n" |
3698 | " slab_reclaimable:%lu slab_unreclaimable:%lu\n" | |
d1ce749a | 3699 | " mapped:%lu shmem:%lu pagetables:%lu bounce:%lu\n" |
d1bfcdb8 | 3700 | " free:%lu free_pcp:%lu free_cma:%lu\n", |
4f98a2fe | 3701 | global_page_state(NR_ACTIVE_ANON), |
4f98a2fe | 3702 | global_page_state(NR_INACTIVE_ANON), |
a731286d KM |
3703 | global_page_state(NR_ISOLATED_ANON), |
3704 | global_page_state(NR_ACTIVE_FILE), | |
4f98a2fe | 3705 | global_page_state(NR_INACTIVE_FILE), |
a731286d | 3706 | global_page_state(NR_ISOLATED_FILE), |
7b854121 | 3707 | global_page_state(NR_UNEVICTABLE), |
b1e7a8fd | 3708 | global_page_state(NR_FILE_DIRTY), |
ce866b34 | 3709 | global_page_state(NR_WRITEBACK), |
fd39fc85 | 3710 | global_page_state(NR_UNSTABLE_NFS), |
3701b033 KM |
3711 | global_page_state(NR_SLAB_RECLAIMABLE), |
3712 | global_page_state(NR_SLAB_UNRECLAIMABLE), | |
65ba55f5 | 3713 | global_page_state(NR_FILE_MAPPED), |
4b02108a | 3714 | global_page_state(NR_SHMEM), |
a25700a5 | 3715 | global_page_state(NR_PAGETABLE), |
d1ce749a | 3716 | global_page_state(NR_BOUNCE), |
d1bfcdb8 KK |
3717 | global_page_state(NR_FREE_PAGES), |
3718 | free_pcp, | |
d1ce749a | 3719 | global_page_state(NR_FREE_CMA_PAGES)); |
1da177e4 | 3720 | |
ee99c71c | 3721 | for_each_populated_zone(zone) { |
1da177e4 LT |
3722 | int i; |
3723 | ||
7bf02ea2 | 3724 | if (skip_free_areas_node(filter, zone_to_nid(zone))) |
ddd588b5 | 3725 | continue; |
d1bfcdb8 KK |
3726 | |
3727 | free_pcp = 0; | |
3728 | for_each_online_cpu(cpu) | |
3729 | free_pcp += per_cpu_ptr(zone->pageset, cpu)->pcp.count; | |
3730 | ||
1da177e4 LT |
3731 | show_node(zone); |
3732 | printk("%s" | |
3733 | " free:%lukB" | |
3734 | " min:%lukB" | |
3735 | " low:%lukB" | |
3736 | " high:%lukB" | |
4f98a2fe RR |
3737 | " active_anon:%lukB" |
3738 | " inactive_anon:%lukB" | |
3739 | " active_file:%lukB" | |
3740 | " inactive_file:%lukB" | |
7b854121 | 3741 | " unevictable:%lukB" |
a731286d KM |
3742 | " isolated(anon):%lukB" |
3743 | " isolated(file):%lukB" | |
1da177e4 | 3744 | " present:%lukB" |
9feedc9d | 3745 | " managed:%lukB" |
4a0aa73f KM |
3746 | " mlocked:%lukB" |
3747 | " dirty:%lukB" | |
3748 | " writeback:%lukB" | |
3749 | " mapped:%lukB" | |
4b02108a | 3750 | " shmem:%lukB" |
4a0aa73f KM |
3751 | " slab_reclaimable:%lukB" |
3752 | " slab_unreclaimable:%lukB" | |
c6a7f572 | 3753 | " kernel_stack:%lukB" |
4a0aa73f KM |
3754 | " pagetables:%lukB" |
3755 | " unstable:%lukB" | |
3756 | " bounce:%lukB" | |
d1bfcdb8 KK |
3757 | " free_pcp:%lukB" |
3758 | " local_pcp:%ukB" | |
d1ce749a | 3759 | " free_cma:%lukB" |
4a0aa73f | 3760 | " writeback_tmp:%lukB" |
1da177e4 LT |
3761 | " pages_scanned:%lu" |
3762 | " all_unreclaimable? %s" | |
3763 | "\n", | |
3764 | zone->name, | |
88f5acf8 | 3765 | K(zone_page_state(zone, NR_FREE_PAGES)), |
41858966 MG |
3766 | K(min_wmark_pages(zone)), |
3767 | K(low_wmark_pages(zone)), | |
3768 | K(high_wmark_pages(zone)), | |
4f98a2fe RR |
3769 | K(zone_page_state(zone, NR_ACTIVE_ANON)), |
3770 | K(zone_page_state(zone, NR_INACTIVE_ANON)), | |
3771 | K(zone_page_state(zone, NR_ACTIVE_FILE)), | |
3772 | K(zone_page_state(zone, NR_INACTIVE_FILE)), | |
7b854121 | 3773 | K(zone_page_state(zone, NR_UNEVICTABLE)), |
a731286d KM |
3774 | K(zone_page_state(zone, NR_ISOLATED_ANON)), |
3775 | K(zone_page_state(zone, NR_ISOLATED_FILE)), | |
1da177e4 | 3776 | K(zone->present_pages), |
9feedc9d | 3777 | K(zone->managed_pages), |
4a0aa73f KM |
3778 | K(zone_page_state(zone, NR_MLOCK)), |
3779 | K(zone_page_state(zone, NR_FILE_DIRTY)), | |
3780 | K(zone_page_state(zone, NR_WRITEBACK)), | |
3781 | K(zone_page_state(zone, NR_FILE_MAPPED)), | |
4b02108a | 3782 | K(zone_page_state(zone, NR_SHMEM)), |
4a0aa73f KM |
3783 | K(zone_page_state(zone, NR_SLAB_RECLAIMABLE)), |
3784 | K(zone_page_state(zone, NR_SLAB_UNRECLAIMABLE)), | |
c6a7f572 KM |
3785 | zone_page_state(zone, NR_KERNEL_STACK) * |
3786 | THREAD_SIZE / 1024, | |
4a0aa73f KM |
3787 | K(zone_page_state(zone, NR_PAGETABLE)), |
3788 | K(zone_page_state(zone, NR_UNSTABLE_NFS)), | |
3789 | K(zone_page_state(zone, NR_BOUNCE)), | |
d1bfcdb8 KK |
3790 | K(free_pcp), |
3791 | K(this_cpu_read(zone->pageset->pcp.count)), | |
d1ce749a | 3792 | K(zone_page_state(zone, NR_FREE_CMA_PAGES)), |
4a0aa73f | 3793 | K(zone_page_state(zone, NR_WRITEBACK_TEMP)), |
0d5d823a | 3794 | K(zone_page_state(zone, NR_PAGES_SCANNED)), |
6e543d57 | 3795 | (!zone_reclaimable(zone) ? "yes" : "no") |
1da177e4 LT |
3796 | ); |
3797 | printk("lowmem_reserve[]:"); | |
3798 | for (i = 0; i < MAX_NR_ZONES; i++) | |
3484b2de | 3799 | printk(" %ld", zone->lowmem_reserve[i]); |
1da177e4 LT |
3800 | printk("\n"); |
3801 | } | |
3802 | ||
ee99c71c | 3803 | for_each_populated_zone(zone) { |
d00181b9 KS |
3804 | unsigned int order; |
3805 | unsigned long nr[MAX_ORDER], flags, total = 0; | |
377e4f16 | 3806 | unsigned char types[MAX_ORDER]; |
1da177e4 | 3807 | |
7bf02ea2 | 3808 | if (skip_free_areas_node(filter, zone_to_nid(zone))) |
ddd588b5 | 3809 | continue; |
1da177e4 LT |
3810 | show_node(zone); |
3811 | printk("%s: ", zone->name); | |
1da177e4 LT |
3812 | |
3813 | spin_lock_irqsave(&zone->lock, flags); | |
3814 | for (order = 0; order < MAX_ORDER; order++) { | |
377e4f16 RV |
3815 | struct free_area *area = &zone->free_area[order]; |
3816 | int type; | |
3817 | ||
3818 | nr[order] = area->nr_free; | |
8f9de51a | 3819 | total += nr[order] << order; |
377e4f16 RV |
3820 | |
3821 | types[order] = 0; | |
3822 | for (type = 0; type < MIGRATE_TYPES; type++) { | |
3823 | if (!list_empty(&area->free_list[type])) | |
3824 | types[order] |= 1 << type; | |
3825 | } | |
1da177e4 LT |
3826 | } |
3827 | spin_unlock_irqrestore(&zone->lock, flags); | |
377e4f16 | 3828 | for (order = 0; order < MAX_ORDER; order++) { |
8f9de51a | 3829 | printk("%lu*%lukB ", nr[order], K(1UL) << order); |
377e4f16 RV |
3830 | if (nr[order]) |
3831 | show_migration_types(types[order]); | |
3832 | } | |
1da177e4 LT |
3833 | printk("= %lukB\n", K(total)); |
3834 | } | |
3835 | ||
949f7ec5 DR |
3836 | hugetlb_show_meminfo(); |
3837 | ||
e6f3602d LW |
3838 | printk("%ld total pagecache pages\n", global_page_state(NR_FILE_PAGES)); |
3839 | ||
1da177e4 LT |
3840 | show_swap_cache_info(); |
3841 | } | |
3842 | ||
19770b32 MG |
3843 | static void zoneref_set_zone(struct zone *zone, struct zoneref *zoneref) |
3844 | { | |
3845 | zoneref->zone = zone; | |
3846 | zoneref->zone_idx = zone_idx(zone); | |
3847 | } | |
3848 | ||
1da177e4 LT |
3849 | /* |
3850 | * Builds allocation fallback zone lists. | |
1a93205b CL |
3851 | * |
3852 | * Add all populated zones of a node to the zonelist. | |
1da177e4 | 3853 | */ |
f0c0b2b8 | 3854 | static int build_zonelists_node(pg_data_t *pgdat, struct zonelist *zonelist, |
bc732f1d | 3855 | int nr_zones) |
1da177e4 | 3856 | { |
1a93205b | 3857 | struct zone *zone; |
bc732f1d | 3858 | enum zone_type zone_type = MAX_NR_ZONES; |
02a68a5e CL |
3859 | |
3860 | do { | |
2f6726e5 | 3861 | zone_type--; |
070f8032 | 3862 | zone = pgdat->node_zones + zone_type; |
1a93205b | 3863 | if (populated_zone(zone)) { |
dd1a239f MG |
3864 | zoneref_set_zone(zone, |
3865 | &zonelist->_zonerefs[nr_zones++]); | |
070f8032 | 3866 | check_highest_zone(zone_type); |
1da177e4 | 3867 | } |
2f6726e5 | 3868 | } while (zone_type); |
bc732f1d | 3869 | |
070f8032 | 3870 | return nr_zones; |
1da177e4 LT |
3871 | } |
3872 | ||
f0c0b2b8 KH |
3873 | |
3874 | /* | |
3875 | * zonelist_order: | |
3876 | * 0 = automatic detection of better ordering. | |
3877 | * 1 = order by ([node] distance, -zonetype) | |
3878 | * 2 = order by (-zonetype, [node] distance) | |
3879 | * | |
3880 | * If not NUMA, ZONELIST_ORDER_ZONE and ZONELIST_ORDER_NODE will create | |
3881 | * the same zonelist. So only NUMA can configure this param. | |
3882 | */ | |
3883 | #define ZONELIST_ORDER_DEFAULT 0 | |
3884 | #define ZONELIST_ORDER_NODE 1 | |
3885 | #define ZONELIST_ORDER_ZONE 2 | |
3886 | ||
3887 | /* zonelist order in the kernel. | |
3888 | * set_zonelist_order() will set this to NODE or ZONE. | |
3889 | */ | |
3890 | static int current_zonelist_order = ZONELIST_ORDER_DEFAULT; | |
3891 | static char zonelist_order_name[3][8] = {"Default", "Node", "Zone"}; | |
3892 | ||
3893 | ||
1da177e4 | 3894 | #ifdef CONFIG_NUMA |
f0c0b2b8 KH |
3895 | /* The value user specified ....changed by config */ |
3896 | static int user_zonelist_order = ZONELIST_ORDER_DEFAULT; | |
3897 | /* string for sysctl */ | |
3898 | #define NUMA_ZONELIST_ORDER_LEN 16 | |
3899 | char numa_zonelist_order[16] = "default"; | |
3900 | ||
3901 | /* | |
3902 | * interface for configure zonelist ordering. | |
3903 | * command line option "numa_zonelist_order" | |
3904 | * = "[dD]efault - default, automatic configuration. | |
3905 | * = "[nN]ode - order by node locality, then by zone within node | |
3906 | * = "[zZ]one - order by zone, then by locality within zone | |
3907 | */ | |
3908 | ||
3909 | static int __parse_numa_zonelist_order(char *s) | |
3910 | { | |
3911 | if (*s == 'd' || *s == 'D') { | |
3912 | user_zonelist_order = ZONELIST_ORDER_DEFAULT; | |
3913 | } else if (*s == 'n' || *s == 'N') { | |
3914 | user_zonelist_order = ZONELIST_ORDER_NODE; | |
3915 | } else if (*s == 'z' || *s == 'Z') { | |
3916 | user_zonelist_order = ZONELIST_ORDER_ZONE; | |
3917 | } else { | |
3918 | printk(KERN_WARNING | |
3919 | "Ignoring invalid numa_zonelist_order value: " | |
3920 | "%s\n", s); | |
3921 | return -EINVAL; | |
3922 | } | |
3923 | return 0; | |
3924 | } | |
3925 | ||
3926 | static __init int setup_numa_zonelist_order(char *s) | |
3927 | { | |
ecb256f8 VL |
3928 | int ret; |
3929 | ||
3930 | if (!s) | |
3931 | return 0; | |
3932 | ||
3933 | ret = __parse_numa_zonelist_order(s); | |
3934 | if (ret == 0) | |
3935 | strlcpy(numa_zonelist_order, s, NUMA_ZONELIST_ORDER_LEN); | |
3936 | ||
3937 | return ret; | |
f0c0b2b8 KH |
3938 | } |
3939 | early_param("numa_zonelist_order", setup_numa_zonelist_order); | |
3940 | ||
3941 | /* | |
3942 | * sysctl handler for numa_zonelist_order | |
3943 | */ | |
cccad5b9 | 3944 | int numa_zonelist_order_handler(struct ctl_table *table, int write, |
8d65af78 | 3945 | void __user *buffer, size_t *length, |
f0c0b2b8 KH |
3946 | loff_t *ppos) |
3947 | { | |
3948 | char saved_string[NUMA_ZONELIST_ORDER_LEN]; | |
3949 | int ret; | |
443c6f14 | 3950 | static DEFINE_MUTEX(zl_order_mutex); |
f0c0b2b8 | 3951 | |
443c6f14 | 3952 | mutex_lock(&zl_order_mutex); |
dacbde09 CG |
3953 | if (write) { |
3954 | if (strlen((char *)table->data) >= NUMA_ZONELIST_ORDER_LEN) { | |
3955 | ret = -EINVAL; | |
3956 | goto out; | |
3957 | } | |
3958 | strcpy(saved_string, (char *)table->data); | |
3959 | } | |
8d65af78 | 3960 | ret = proc_dostring(table, write, buffer, length, ppos); |
f0c0b2b8 | 3961 | if (ret) |
443c6f14 | 3962 | goto out; |
f0c0b2b8 KH |
3963 | if (write) { |
3964 | int oldval = user_zonelist_order; | |
dacbde09 CG |
3965 | |
3966 | ret = __parse_numa_zonelist_order((char *)table->data); | |
3967 | if (ret) { | |
f0c0b2b8 KH |
3968 | /* |
3969 | * bogus value. restore saved string | |
3970 | */ | |
dacbde09 | 3971 | strncpy((char *)table->data, saved_string, |
f0c0b2b8 KH |
3972 | NUMA_ZONELIST_ORDER_LEN); |
3973 | user_zonelist_order = oldval; | |
4eaf3f64 HL |
3974 | } else if (oldval != user_zonelist_order) { |
3975 | mutex_lock(&zonelists_mutex); | |
9adb62a5 | 3976 | build_all_zonelists(NULL, NULL); |
4eaf3f64 HL |
3977 | mutex_unlock(&zonelists_mutex); |
3978 | } | |
f0c0b2b8 | 3979 | } |
443c6f14 AK |
3980 | out: |
3981 | mutex_unlock(&zl_order_mutex); | |
3982 | return ret; | |
f0c0b2b8 KH |
3983 | } |
3984 | ||
3985 | ||
62bc62a8 | 3986 | #define MAX_NODE_LOAD (nr_online_nodes) |
f0c0b2b8 KH |
3987 | static int node_load[MAX_NUMNODES]; |
3988 | ||
1da177e4 | 3989 | /** |
4dc3b16b | 3990 | * find_next_best_node - find the next node that should appear in a given node's fallback list |
1da177e4 LT |
3991 | * @node: node whose fallback list we're appending |
3992 | * @used_node_mask: nodemask_t of already used nodes | |
3993 | * | |
3994 | * We use a number of factors to determine which is the next node that should | |
3995 | * appear on a given node's fallback list. The node should not have appeared | |
3996 | * already in @node's fallback list, and it should be the next closest node | |
3997 | * according to the distance array (which contains arbitrary distance values | |
3998 | * from each node to each node in the system), and should also prefer nodes | |
3999 | * with no CPUs, since presumably they'll have very little allocation pressure | |
4000 | * on them otherwise. | |
4001 | * It returns -1 if no node is found. | |
4002 | */ | |
f0c0b2b8 | 4003 | static int find_next_best_node(int node, nodemask_t *used_node_mask) |
1da177e4 | 4004 | { |
4cf808eb | 4005 | int n, val; |
1da177e4 | 4006 | int min_val = INT_MAX; |
00ef2d2f | 4007 | int best_node = NUMA_NO_NODE; |
a70f7302 | 4008 | const struct cpumask *tmp = cpumask_of_node(0); |
1da177e4 | 4009 | |
4cf808eb LT |
4010 | /* Use the local node if we haven't already */ |
4011 | if (!node_isset(node, *used_node_mask)) { | |
4012 | node_set(node, *used_node_mask); | |
4013 | return node; | |
4014 | } | |
1da177e4 | 4015 | |
4b0ef1fe | 4016 | for_each_node_state(n, N_MEMORY) { |
1da177e4 LT |
4017 | |
4018 | /* Don't want a node to appear more than once */ | |
4019 | if (node_isset(n, *used_node_mask)) | |
4020 | continue; | |
4021 | ||
1da177e4 LT |
4022 | /* Use the distance array to find the distance */ |
4023 | val = node_distance(node, n); | |
4024 | ||
4cf808eb LT |
4025 | /* Penalize nodes under us ("prefer the next node") */ |
4026 | val += (n < node); | |
4027 | ||
1da177e4 | 4028 | /* Give preference to headless and unused nodes */ |
a70f7302 RR |
4029 | tmp = cpumask_of_node(n); |
4030 | if (!cpumask_empty(tmp)) | |
1da177e4 LT |
4031 | val += PENALTY_FOR_NODE_WITH_CPUS; |
4032 | ||
4033 | /* Slight preference for less loaded node */ | |
4034 | val *= (MAX_NODE_LOAD*MAX_NUMNODES); | |
4035 | val += node_load[n]; | |
4036 | ||
4037 | if (val < min_val) { | |
4038 | min_val = val; | |
4039 | best_node = n; | |
4040 | } | |
4041 | } | |
4042 | ||
4043 | if (best_node >= 0) | |
4044 | node_set(best_node, *used_node_mask); | |
4045 | ||
4046 | return best_node; | |
4047 | } | |
4048 | ||
f0c0b2b8 KH |
4049 | |
4050 | /* | |
4051 | * Build zonelists ordered by node and zones within node. | |
4052 | * This results in maximum locality--normal zone overflows into local | |
4053 | * DMA zone, if any--but risks exhausting DMA zone. | |
4054 | */ | |
4055 | static void build_zonelists_in_node_order(pg_data_t *pgdat, int node) | |
1da177e4 | 4056 | { |
f0c0b2b8 | 4057 | int j; |
1da177e4 | 4058 | struct zonelist *zonelist; |
f0c0b2b8 | 4059 | |
54a6eb5c | 4060 | zonelist = &pgdat->node_zonelists[0]; |
dd1a239f | 4061 | for (j = 0; zonelist->_zonerefs[j].zone != NULL; j++) |
54a6eb5c | 4062 | ; |
bc732f1d | 4063 | j = build_zonelists_node(NODE_DATA(node), zonelist, j); |
dd1a239f MG |
4064 | zonelist->_zonerefs[j].zone = NULL; |
4065 | zonelist->_zonerefs[j].zone_idx = 0; | |
f0c0b2b8 KH |
4066 | } |
4067 | ||
523b9458 CL |
4068 | /* |
4069 | * Build gfp_thisnode zonelists | |
4070 | */ | |
4071 | static void build_thisnode_zonelists(pg_data_t *pgdat) | |
4072 | { | |
523b9458 CL |
4073 | int j; |
4074 | struct zonelist *zonelist; | |
4075 | ||
54a6eb5c | 4076 | zonelist = &pgdat->node_zonelists[1]; |
bc732f1d | 4077 | j = build_zonelists_node(pgdat, zonelist, 0); |
dd1a239f MG |
4078 | zonelist->_zonerefs[j].zone = NULL; |
4079 | zonelist->_zonerefs[j].zone_idx = 0; | |
523b9458 CL |
4080 | } |
4081 | ||
f0c0b2b8 KH |
4082 | /* |
4083 | * Build zonelists ordered by zone and nodes within zones. | |
4084 | * This results in conserving DMA zone[s] until all Normal memory is | |
4085 | * exhausted, but results in overflowing to remote node while memory | |
4086 | * may still exist in local DMA zone. | |
4087 | */ | |
4088 | static int node_order[MAX_NUMNODES]; | |
4089 | ||
4090 | static void build_zonelists_in_zone_order(pg_data_t *pgdat, int nr_nodes) | |
4091 | { | |
f0c0b2b8 KH |
4092 | int pos, j, node; |
4093 | int zone_type; /* needs to be signed */ | |
4094 | struct zone *z; | |
4095 | struct zonelist *zonelist; | |
4096 | ||
54a6eb5c MG |
4097 | zonelist = &pgdat->node_zonelists[0]; |
4098 | pos = 0; | |
4099 | for (zone_type = MAX_NR_ZONES - 1; zone_type >= 0; zone_type--) { | |
4100 | for (j = 0; j < nr_nodes; j++) { | |
4101 | node = node_order[j]; | |
4102 | z = &NODE_DATA(node)->node_zones[zone_type]; | |
4103 | if (populated_zone(z)) { | |
dd1a239f MG |
4104 | zoneref_set_zone(z, |
4105 | &zonelist->_zonerefs[pos++]); | |
54a6eb5c | 4106 | check_highest_zone(zone_type); |
f0c0b2b8 KH |
4107 | } |
4108 | } | |
f0c0b2b8 | 4109 | } |
dd1a239f MG |
4110 | zonelist->_zonerefs[pos].zone = NULL; |
4111 | zonelist->_zonerefs[pos].zone_idx = 0; | |
f0c0b2b8 KH |
4112 | } |
4113 | ||
3193913c MG |
4114 | #if defined(CONFIG_64BIT) |
4115 | /* | |
4116 | * Devices that require DMA32/DMA are relatively rare and do not justify a | |
4117 | * penalty to every machine in case the specialised case applies. Default | |
4118 | * to Node-ordering on 64-bit NUMA machines | |
4119 | */ | |
4120 | static int default_zonelist_order(void) | |
4121 | { | |
4122 | return ZONELIST_ORDER_NODE; | |
4123 | } | |
4124 | #else | |
4125 | /* | |
4126 | * On 32-bit, the Normal zone needs to be preserved for allocations accessible | |
4127 | * by the kernel. If processes running on node 0 deplete the low memory zone | |
4128 | * then reclaim will occur more frequency increasing stalls and potentially | |
4129 | * be easier to OOM if a large percentage of the zone is under writeback or | |
4130 | * dirty. The problem is significantly worse if CONFIG_HIGHPTE is not set. | |
4131 | * Hence, default to zone ordering on 32-bit. | |
4132 | */ | |
f0c0b2b8 KH |
4133 | static int default_zonelist_order(void) |
4134 | { | |
f0c0b2b8 KH |
4135 | return ZONELIST_ORDER_ZONE; |
4136 | } | |
3193913c | 4137 | #endif /* CONFIG_64BIT */ |
f0c0b2b8 KH |
4138 | |
4139 | static void set_zonelist_order(void) | |
4140 | { | |
4141 | if (user_zonelist_order == ZONELIST_ORDER_DEFAULT) | |
4142 | current_zonelist_order = default_zonelist_order(); | |
4143 | else | |
4144 | current_zonelist_order = user_zonelist_order; | |
4145 | } | |
4146 | ||
4147 | static void build_zonelists(pg_data_t *pgdat) | |
4148 | { | |
4149 | int j, node, load; | |
4150 | enum zone_type i; | |
1da177e4 | 4151 | nodemask_t used_mask; |
f0c0b2b8 KH |
4152 | int local_node, prev_node; |
4153 | struct zonelist *zonelist; | |
d00181b9 | 4154 | unsigned int order = current_zonelist_order; |
1da177e4 LT |
4155 | |
4156 | /* initialize zonelists */ | |
523b9458 | 4157 | for (i = 0; i < MAX_ZONELISTS; i++) { |
1da177e4 | 4158 | zonelist = pgdat->node_zonelists + i; |
dd1a239f MG |
4159 | zonelist->_zonerefs[0].zone = NULL; |
4160 | zonelist->_zonerefs[0].zone_idx = 0; | |
1da177e4 LT |
4161 | } |
4162 | ||
4163 | /* NUMA-aware ordering of nodes */ | |
4164 | local_node = pgdat->node_id; | |
62bc62a8 | 4165 | load = nr_online_nodes; |
1da177e4 LT |
4166 | prev_node = local_node; |
4167 | nodes_clear(used_mask); | |
f0c0b2b8 | 4168 | |
f0c0b2b8 KH |
4169 | memset(node_order, 0, sizeof(node_order)); |
4170 | j = 0; | |
4171 | ||
1da177e4 LT |
4172 | while ((node = find_next_best_node(local_node, &used_mask)) >= 0) { |
4173 | /* | |
4174 | * We don't want to pressure a particular node. | |
4175 | * So adding penalty to the first node in same | |
4176 | * distance group to make it round-robin. | |
4177 | */ | |
957f822a DR |
4178 | if (node_distance(local_node, node) != |
4179 | node_distance(local_node, prev_node)) | |
f0c0b2b8 KH |
4180 | node_load[node] = load; |
4181 | ||
1da177e4 LT |
4182 | prev_node = node; |
4183 | load--; | |
f0c0b2b8 KH |
4184 | if (order == ZONELIST_ORDER_NODE) |
4185 | build_zonelists_in_node_order(pgdat, node); | |
4186 | else | |
4187 | node_order[j++] = node; /* remember order */ | |
4188 | } | |
1da177e4 | 4189 | |
f0c0b2b8 KH |
4190 | if (order == ZONELIST_ORDER_ZONE) { |
4191 | /* calculate node order -- i.e., DMA last! */ | |
4192 | build_zonelists_in_zone_order(pgdat, j); | |
1da177e4 | 4193 | } |
523b9458 CL |
4194 | |
4195 | build_thisnode_zonelists(pgdat); | |
1da177e4 LT |
4196 | } |
4197 | ||
7aac7898 LS |
4198 | #ifdef CONFIG_HAVE_MEMORYLESS_NODES |
4199 | /* | |
4200 | * Return node id of node used for "local" allocations. | |
4201 | * I.e., first node id of first zone in arg node's generic zonelist. | |
4202 | * Used for initializing percpu 'numa_mem', which is used primarily | |
4203 | * for kernel allocations, so use GFP_KERNEL flags to locate zonelist. | |
4204 | */ | |
4205 | int local_memory_node(int node) | |
4206 | { | |
4207 | struct zone *zone; | |
4208 | ||
4209 | (void)first_zones_zonelist(node_zonelist(node, GFP_KERNEL), | |
4210 | gfp_zone(GFP_KERNEL), | |
4211 | NULL, | |
4212 | &zone); | |
4213 | return zone->node; | |
4214 | } | |
4215 | #endif | |
f0c0b2b8 | 4216 | |
1da177e4 LT |
4217 | #else /* CONFIG_NUMA */ |
4218 | ||
f0c0b2b8 KH |
4219 | static void set_zonelist_order(void) |
4220 | { | |
4221 | current_zonelist_order = ZONELIST_ORDER_ZONE; | |
4222 | } | |
4223 | ||
4224 | static void build_zonelists(pg_data_t *pgdat) | |
1da177e4 | 4225 | { |
19655d34 | 4226 | int node, local_node; |
54a6eb5c MG |
4227 | enum zone_type j; |
4228 | struct zonelist *zonelist; | |
1da177e4 LT |
4229 | |
4230 | local_node = pgdat->node_id; | |
1da177e4 | 4231 | |
54a6eb5c | 4232 | zonelist = &pgdat->node_zonelists[0]; |
bc732f1d | 4233 | j = build_zonelists_node(pgdat, zonelist, 0); |
1da177e4 | 4234 | |
54a6eb5c MG |
4235 | /* |
4236 | * Now we build the zonelist so that it contains the zones | |
4237 | * of all the other nodes. | |
4238 | * We don't want to pressure a particular node, so when | |
4239 | * building the zones for node N, we make sure that the | |
4240 | * zones coming right after the local ones are those from | |
4241 | * node N+1 (modulo N) | |
4242 | */ | |
4243 | for (node = local_node + 1; node < MAX_NUMNODES; node++) { | |
4244 | if (!node_online(node)) | |
4245 | continue; | |
bc732f1d | 4246 | j = build_zonelists_node(NODE_DATA(node), zonelist, j); |
1da177e4 | 4247 | } |
54a6eb5c MG |
4248 | for (node = 0; node < local_node; node++) { |
4249 | if (!node_online(node)) | |
4250 | continue; | |
bc732f1d | 4251 | j = build_zonelists_node(NODE_DATA(node), zonelist, j); |
54a6eb5c MG |
4252 | } |
4253 | ||
dd1a239f MG |
4254 | zonelist->_zonerefs[j].zone = NULL; |
4255 | zonelist->_zonerefs[j].zone_idx = 0; | |
1da177e4 LT |
4256 | } |
4257 | ||
4258 | #endif /* CONFIG_NUMA */ | |
4259 | ||
99dcc3e5 CL |
4260 | /* |
4261 | * Boot pageset table. One per cpu which is going to be used for all | |
4262 | * zones and all nodes. The parameters will be set in such a way | |
4263 | * that an item put on a list will immediately be handed over to | |
4264 | * the buddy list. This is safe since pageset manipulation is done | |
4265 | * with interrupts disabled. | |
4266 | * | |
4267 | * The boot_pagesets must be kept even after bootup is complete for | |
4268 | * unused processors and/or zones. They do play a role for bootstrapping | |
4269 | * hotplugged processors. | |
4270 | * | |
4271 | * zoneinfo_show() and maybe other functions do | |
4272 | * not check if the processor is online before following the pageset pointer. | |
4273 | * Other parts of the kernel may not check if the zone is available. | |
4274 | */ | |
4275 | static void setup_pageset(struct per_cpu_pageset *p, unsigned long batch); | |
4276 | static DEFINE_PER_CPU(struct per_cpu_pageset, boot_pageset); | |
1f522509 | 4277 | static void setup_zone_pageset(struct zone *zone); |
99dcc3e5 | 4278 | |
4eaf3f64 HL |
4279 | /* |
4280 | * Global mutex to protect against size modification of zonelists | |
4281 | * as well as to serialize pageset setup for the new populated zone. | |
4282 | */ | |
4283 | DEFINE_MUTEX(zonelists_mutex); | |
4284 | ||
9b1a4d38 | 4285 | /* return values int ....just for stop_machine() */ |
4ed7e022 | 4286 | static int __build_all_zonelists(void *data) |
1da177e4 | 4287 | { |
6811378e | 4288 | int nid; |
99dcc3e5 | 4289 | int cpu; |
9adb62a5 | 4290 | pg_data_t *self = data; |
9276b1bc | 4291 | |
7f9cfb31 BL |
4292 | #ifdef CONFIG_NUMA |
4293 | memset(node_load, 0, sizeof(node_load)); | |
4294 | #endif | |
9adb62a5 JL |
4295 | |
4296 | if (self && !node_online(self->node_id)) { | |
4297 | build_zonelists(self); | |
9adb62a5 JL |
4298 | } |
4299 | ||
9276b1bc | 4300 | for_each_online_node(nid) { |
7ea1530a CL |
4301 | pg_data_t *pgdat = NODE_DATA(nid); |
4302 | ||
4303 | build_zonelists(pgdat); | |
9276b1bc | 4304 | } |
99dcc3e5 CL |
4305 | |
4306 | /* | |
4307 | * Initialize the boot_pagesets that are going to be used | |
4308 | * for bootstrapping processors. The real pagesets for | |
4309 | * each zone will be allocated later when the per cpu | |
4310 | * allocator is available. | |
4311 | * | |
4312 | * boot_pagesets are used also for bootstrapping offline | |
4313 | * cpus if the system is already booted because the pagesets | |
4314 | * are needed to initialize allocators on a specific cpu too. | |
4315 | * F.e. the percpu allocator needs the page allocator which | |
4316 | * needs the percpu allocator in order to allocate its pagesets | |
4317 | * (a chicken-egg dilemma). | |
4318 | */ | |
7aac7898 | 4319 | for_each_possible_cpu(cpu) { |
99dcc3e5 CL |
4320 | setup_pageset(&per_cpu(boot_pageset, cpu), 0); |
4321 | ||
7aac7898 LS |
4322 | #ifdef CONFIG_HAVE_MEMORYLESS_NODES |
4323 | /* | |
4324 | * We now know the "local memory node" for each node-- | |
4325 | * i.e., the node of the first zone in the generic zonelist. | |
4326 | * Set up numa_mem percpu variable for on-line cpus. During | |
4327 | * boot, only the boot cpu should be on-line; we'll init the | |
4328 | * secondary cpus' numa_mem as they come on-line. During | |
4329 | * node/memory hotplug, we'll fixup all on-line cpus. | |
4330 | */ | |
4331 | if (cpu_online(cpu)) | |
4332 | set_cpu_numa_mem(cpu, local_memory_node(cpu_to_node(cpu))); | |
4333 | #endif | |
4334 | } | |
4335 | ||
6811378e YG |
4336 | return 0; |
4337 | } | |
4338 | ||
061f67bc RV |
4339 | static noinline void __init |
4340 | build_all_zonelists_init(void) | |
4341 | { | |
4342 | __build_all_zonelists(NULL); | |
4343 | mminit_verify_zonelist(); | |
4344 | cpuset_init_current_mems_allowed(); | |
4345 | } | |
4346 | ||
4eaf3f64 HL |
4347 | /* |
4348 | * Called with zonelists_mutex held always | |
4349 | * unless system_state == SYSTEM_BOOTING. | |
061f67bc RV |
4350 | * |
4351 | * __ref due to (1) call of __meminit annotated setup_zone_pageset | |
4352 | * [we're only called with non-NULL zone through __meminit paths] and | |
4353 | * (2) call of __init annotated helper build_all_zonelists_init | |
4354 | * [protected by SYSTEM_BOOTING]. | |
4eaf3f64 | 4355 | */ |
9adb62a5 | 4356 | void __ref build_all_zonelists(pg_data_t *pgdat, struct zone *zone) |
6811378e | 4357 | { |
f0c0b2b8 KH |
4358 | set_zonelist_order(); |
4359 | ||
6811378e | 4360 | if (system_state == SYSTEM_BOOTING) { |
061f67bc | 4361 | build_all_zonelists_init(); |
6811378e | 4362 | } else { |
e9959f0f | 4363 | #ifdef CONFIG_MEMORY_HOTPLUG |
9adb62a5 JL |
4364 | if (zone) |
4365 | setup_zone_pageset(zone); | |
e9959f0f | 4366 | #endif |
dd1895e2 CS |
4367 | /* we have to stop all cpus to guarantee there is no user |
4368 | of zonelist */ | |
9adb62a5 | 4369 | stop_machine(__build_all_zonelists, pgdat, NULL); |
6811378e YG |
4370 | /* cpuset refresh routine should be here */ |
4371 | } | |
bd1e22b8 | 4372 | vm_total_pages = nr_free_pagecache_pages(); |
9ef9acb0 MG |
4373 | /* |
4374 | * Disable grouping by mobility if the number of pages in the | |
4375 | * system is too low to allow the mechanism to work. It would be | |
4376 | * more accurate, but expensive to check per-zone. This check is | |
4377 | * made on memory-hotadd so a system can start with mobility | |
4378 | * disabled and enable it later | |
4379 | */ | |
d9c23400 | 4380 | if (vm_total_pages < (pageblock_nr_pages * MIGRATE_TYPES)) |
9ef9acb0 MG |
4381 | page_group_by_mobility_disabled = 1; |
4382 | else | |
4383 | page_group_by_mobility_disabled = 0; | |
4384 | ||
f88dfff5 | 4385 | pr_info("Built %i zonelists in %s order, mobility grouping %s. " |
9ef9acb0 | 4386 | "Total pages: %ld\n", |
62bc62a8 | 4387 | nr_online_nodes, |
f0c0b2b8 | 4388 | zonelist_order_name[current_zonelist_order], |
9ef9acb0 | 4389 | page_group_by_mobility_disabled ? "off" : "on", |
f0c0b2b8 KH |
4390 | vm_total_pages); |
4391 | #ifdef CONFIG_NUMA | |
f88dfff5 | 4392 | pr_info("Policy zone: %s\n", zone_names[policy_zone]); |
f0c0b2b8 | 4393 | #endif |
1da177e4 LT |
4394 | } |
4395 | ||
4396 | /* | |
4397 | * Helper functions to size the waitqueue hash table. | |
4398 | * Essentially these want to choose hash table sizes sufficiently | |
4399 | * large so that collisions trying to wait on pages are rare. | |
4400 | * But in fact, the number of active page waitqueues on typical | |
4401 | * systems is ridiculously low, less than 200. So this is even | |
4402 | * conservative, even though it seems large. | |
4403 | * | |
4404 | * The constant PAGES_PER_WAITQUEUE specifies the ratio of pages to | |
4405 | * waitqueues, i.e. the size of the waitq table given the number of pages. | |
4406 | */ | |
4407 | #define PAGES_PER_WAITQUEUE 256 | |
4408 | ||
cca448fe | 4409 | #ifndef CONFIG_MEMORY_HOTPLUG |
02b694de | 4410 | static inline unsigned long wait_table_hash_nr_entries(unsigned long pages) |
1da177e4 LT |
4411 | { |
4412 | unsigned long size = 1; | |
4413 | ||
4414 | pages /= PAGES_PER_WAITQUEUE; | |
4415 | ||
4416 | while (size < pages) | |
4417 | size <<= 1; | |
4418 | ||
4419 | /* | |
4420 | * Once we have dozens or even hundreds of threads sleeping | |
4421 | * on IO we've got bigger problems than wait queue collision. | |
4422 | * Limit the size of the wait table to a reasonable size. | |
4423 | */ | |
4424 | size = min(size, 4096UL); | |
4425 | ||
4426 | return max(size, 4UL); | |
4427 | } | |
cca448fe YG |
4428 | #else |
4429 | /* | |
4430 | * A zone's size might be changed by hot-add, so it is not possible to determine | |
4431 | * a suitable size for its wait_table. So we use the maximum size now. | |
4432 | * | |
4433 | * The max wait table size = 4096 x sizeof(wait_queue_head_t). ie: | |
4434 | * | |
4435 | * i386 (preemption config) : 4096 x 16 = 64Kbyte. | |
4436 | * ia64, x86-64 (no preemption): 4096 x 20 = 80Kbyte. | |
4437 | * ia64, x86-64 (preemption) : 4096 x 24 = 96Kbyte. | |
4438 | * | |
4439 | * The maximum entries are prepared when a zone's memory is (512K + 256) pages | |
4440 | * or more by the traditional way. (See above). It equals: | |
4441 | * | |
4442 | * i386, x86-64, powerpc(4K page size) : = ( 2G + 1M)byte. | |
4443 | * ia64(16K page size) : = ( 8G + 4M)byte. | |
4444 | * powerpc (64K page size) : = (32G +16M)byte. | |
4445 | */ | |
4446 | static inline unsigned long wait_table_hash_nr_entries(unsigned long pages) | |
4447 | { | |
4448 | return 4096UL; | |
4449 | } | |
4450 | #endif | |
1da177e4 LT |
4451 | |
4452 | /* | |
4453 | * This is an integer logarithm so that shifts can be used later | |
4454 | * to extract the more random high bits from the multiplicative | |
4455 | * hash function before the remainder is taken. | |
4456 | */ | |
4457 | static inline unsigned long wait_table_bits(unsigned long size) | |
4458 | { | |
4459 | return ffz(~size); | |
4460 | } | |
4461 | ||
1da177e4 LT |
4462 | /* |
4463 | * Initially all pages are reserved - free ones are freed | |
4464 | * up by free_all_bootmem() once the early boot process is | |
4465 | * done. Non-atomic initialization, single-pass. | |
4466 | */ | |
c09b4240 | 4467 | void __meminit memmap_init_zone(unsigned long size, int nid, unsigned long zone, |
a2f3aa02 | 4468 | unsigned long start_pfn, enum memmap_context context) |
1da177e4 | 4469 | { |
3a80a7fa | 4470 | pg_data_t *pgdat = NODE_DATA(nid); |
29751f69 AW |
4471 | unsigned long end_pfn = start_pfn + size; |
4472 | unsigned long pfn; | |
86051ca5 | 4473 | struct zone *z; |
3a80a7fa | 4474 | unsigned long nr_initialised = 0; |
1da177e4 | 4475 | |
22b31eec HD |
4476 | if (highest_memmap_pfn < end_pfn - 1) |
4477 | highest_memmap_pfn = end_pfn - 1; | |
4478 | ||
3a80a7fa | 4479 | z = &pgdat->node_zones[zone]; |
cbe8dd4a | 4480 | for (pfn = start_pfn; pfn < end_pfn; pfn++) { |
a2f3aa02 DH |
4481 | /* |
4482 | * There can be holes in boot-time mem_map[]s | |
4483 | * handed to this function. They do not | |
4484 | * exist on hotplugged memory. | |
4485 | */ | |
4486 | if (context == MEMMAP_EARLY) { | |
4487 | if (!early_pfn_valid(pfn)) | |
4488 | continue; | |
4489 | if (!early_pfn_in_nid(pfn, nid)) | |
4490 | continue; | |
3a80a7fa MG |
4491 | if (!update_defer_init(pgdat, pfn, end_pfn, |
4492 | &nr_initialised)) | |
4493 | break; | |
a2f3aa02 | 4494 | } |
ac5d2539 MG |
4495 | |
4496 | /* | |
4497 | * Mark the block movable so that blocks are reserved for | |
4498 | * movable at startup. This will force kernel allocations | |
4499 | * to reserve their blocks rather than leaking throughout | |
4500 | * the address space during boot when many long-lived | |
974a786e | 4501 | * kernel allocations are made. |
ac5d2539 MG |
4502 | * |
4503 | * bitmap is created for zone's valid pfn range. but memmap | |
4504 | * can be created for invalid pages (for alignment) | |
4505 | * check here not to call set_pageblock_migratetype() against | |
4506 | * pfn out of zone. | |
4507 | */ | |
4508 | if (!(pfn & (pageblock_nr_pages - 1))) { | |
4509 | struct page *page = pfn_to_page(pfn); | |
4510 | ||
4511 | __init_single_page(page, pfn, zone, nid); | |
4512 | set_pageblock_migratetype(page, MIGRATE_MOVABLE); | |
4513 | } else { | |
4514 | __init_single_pfn(pfn, zone, nid); | |
4515 | } | |
1da177e4 LT |
4516 | } |
4517 | } | |
4518 | ||
1e548deb | 4519 | static void __meminit zone_init_free_lists(struct zone *zone) |
1da177e4 | 4520 | { |
7aeb09f9 | 4521 | unsigned int order, t; |
b2a0ac88 MG |
4522 | for_each_migratetype_order(order, t) { |
4523 | INIT_LIST_HEAD(&zone->free_area[order].free_list[t]); | |
1da177e4 LT |
4524 | zone->free_area[order].nr_free = 0; |
4525 | } | |
4526 | } | |
4527 | ||
4528 | #ifndef __HAVE_ARCH_MEMMAP_INIT | |
4529 | #define memmap_init(size, nid, zone, start_pfn) \ | |
a2f3aa02 | 4530 | memmap_init_zone((size), (nid), (zone), (start_pfn), MEMMAP_EARLY) |
1da177e4 LT |
4531 | #endif |
4532 | ||
7cd2b0a3 | 4533 | static int zone_batchsize(struct zone *zone) |
e7c8d5c9 | 4534 | { |
3a6be87f | 4535 | #ifdef CONFIG_MMU |
e7c8d5c9 CL |
4536 | int batch; |
4537 | ||
4538 | /* | |
4539 | * The per-cpu-pages pools are set to around 1000th of the | |
ba56e91c | 4540 | * size of the zone. But no more than 1/2 of a meg. |
e7c8d5c9 CL |
4541 | * |
4542 | * OK, so we don't know how big the cache is. So guess. | |
4543 | */ | |
b40da049 | 4544 | batch = zone->managed_pages / 1024; |
ba56e91c SR |
4545 | if (batch * PAGE_SIZE > 512 * 1024) |
4546 | batch = (512 * 1024) / PAGE_SIZE; | |
e7c8d5c9 CL |
4547 | batch /= 4; /* We effectively *= 4 below */ |
4548 | if (batch < 1) | |
4549 | batch = 1; | |
4550 | ||
4551 | /* | |
0ceaacc9 NP |
4552 | * Clamp the batch to a 2^n - 1 value. Having a power |
4553 | * of 2 value was found to be more likely to have | |
4554 | * suboptimal cache aliasing properties in some cases. | |
e7c8d5c9 | 4555 | * |
0ceaacc9 NP |
4556 | * For example if 2 tasks are alternately allocating |
4557 | * batches of pages, one task can end up with a lot | |
4558 | * of pages of one half of the possible page colors | |
4559 | * and the other with pages of the other colors. | |
e7c8d5c9 | 4560 | */ |
9155203a | 4561 | batch = rounddown_pow_of_two(batch + batch/2) - 1; |
ba56e91c | 4562 | |
e7c8d5c9 | 4563 | return batch; |
3a6be87f DH |
4564 | |
4565 | #else | |
4566 | /* The deferral and batching of frees should be suppressed under NOMMU | |
4567 | * conditions. | |
4568 | * | |
4569 | * The problem is that NOMMU needs to be able to allocate large chunks | |
4570 | * of contiguous memory as there's no hardware page translation to | |
4571 | * assemble apparent contiguous memory from discontiguous pages. | |
4572 | * | |
4573 | * Queueing large contiguous runs of pages for batching, however, | |
4574 | * causes the pages to actually be freed in smaller chunks. As there | |
4575 | * can be a significant delay between the individual batches being | |
4576 | * recycled, this leads to the once large chunks of space being | |
4577 | * fragmented and becoming unavailable for high-order allocations. | |
4578 | */ | |
4579 | return 0; | |
4580 | #endif | |
e7c8d5c9 CL |
4581 | } |
4582 | ||
8d7a8fa9 CS |
4583 | /* |
4584 | * pcp->high and pcp->batch values are related and dependent on one another: | |
4585 | * ->batch must never be higher then ->high. | |
4586 | * The following function updates them in a safe manner without read side | |
4587 | * locking. | |
4588 | * | |
4589 | * Any new users of pcp->batch and pcp->high should ensure they can cope with | |
4590 | * those fields changing asynchronously (acording the the above rule). | |
4591 | * | |
4592 | * mutex_is_locked(&pcp_batch_high_lock) required when calling this function | |
4593 | * outside of boot time (or some other assurance that no concurrent updaters | |
4594 | * exist). | |
4595 | */ | |
4596 | static void pageset_update(struct per_cpu_pages *pcp, unsigned long high, | |
4597 | unsigned long batch) | |
4598 | { | |
4599 | /* start with a fail safe value for batch */ | |
4600 | pcp->batch = 1; | |
4601 | smp_wmb(); | |
4602 | ||
4603 | /* Update high, then batch, in order */ | |
4604 | pcp->high = high; | |
4605 | smp_wmb(); | |
4606 | ||
4607 | pcp->batch = batch; | |
4608 | } | |
4609 | ||
3664033c | 4610 | /* a companion to pageset_set_high() */ |
4008bab7 CS |
4611 | static void pageset_set_batch(struct per_cpu_pageset *p, unsigned long batch) |
4612 | { | |
8d7a8fa9 | 4613 | pageset_update(&p->pcp, 6 * batch, max(1UL, 1 * batch)); |
4008bab7 CS |
4614 | } |
4615 | ||
88c90dbc | 4616 | static void pageset_init(struct per_cpu_pageset *p) |
2caaad41 CL |
4617 | { |
4618 | struct per_cpu_pages *pcp; | |
5f8dcc21 | 4619 | int migratetype; |
2caaad41 | 4620 | |
1c6fe946 MD |
4621 | memset(p, 0, sizeof(*p)); |
4622 | ||
3dfa5721 | 4623 | pcp = &p->pcp; |
2caaad41 | 4624 | pcp->count = 0; |
5f8dcc21 MG |
4625 | for (migratetype = 0; migratetype < MIGRATE_PCPTYPES; migratetype++) |
4626 | INIT_LIST_HEAD(&pcp->lists[migratetype]); | |
2caaad41 CL |
4627 | } |
4628 | ||
88c90dbc CS |
4629 | static void setup_pageset(struct per_cpu_pageset *p, unsigned long batch) |
4630 | { | |
4631 | pageset_init(p); | |
4632 | pageset_set_batch(p, batch); | |
4633 | } | |
4634 | ||
8ad4b1fb | 4635 | /* |
3664033c | 4636 | * pageset_set_high() sets the high water mark for hot per_cpu_pagelist |
8ad4b1fb RS |
4637 | * to the value high for the pageset p. |
4638 | */ | |
3664033c | 4639 | static void pageset_set_high(struct per_cpu_pageset *p, |
8ad4b1fb RS |
4640 | unsigned long high) |
4641 | { | |
8d7a8fa9 CS |
4642 | unsigned long batch = max(1UL, high / 4); |
4643 | if ((high / 4) > (PAGE_SHIFT * 8)) | |
4644 | batch = PAGE_SHIFT * 8; | |
8ad4b1fb | 4645 | |
8d7a8fa9 | 4646 | pageset_update(&p->pcp, high, batch); |
8ad4b1fb RS |
4647 | } |
4648 | ||
7cd2b0a3 DR |
4649 | static void pageset_set_high_and_batch(struct zone *zone, |
4650 | struct per_cpu_pageset *pcp) | |
56cef2b8 | 4651 | { |
56cef2b8 | 4652 | if (percpu_pagelist_fraction) |
3664033c | 4653 | pageset_set_high(pcp, |
56cef2b8 CS |
4654 | (zone->managed_pages / |
4655 | percpu_pagelist_fraction)); | |
4656 | else | |
4657 | pageset_set_batch(pcp, zone_batchsize(zone)); | |
4658 | } | |
4659 | ||
169f6c19 CS |
4660 | static void __meminit zone_pageset_init(struct zone *zone, int cpu) |
4661 | { | |
4662 | struct per_cpu_pageset *pcp = per_cpu_ptr(zone->pageset, cpu); | |
4663 | ||
4664 | pageset_init(pcp); | |
4665 | pageset_set_high_and_batch(zone, pcp); | |
4666 | } | |
4667 | ||
4ed7e022 | 4668 | static void __meminit setup_zone_pageset(struct zone *zone) |
319774e2 WF |
4669 | { |
4670 | int cpu; | |
319774e2 | 4671 | zone->pageset = alloc_percpu(struct per_cpu_pageset); |
56cef2b8 CS |
4672 | for_each_possible_cpu(cpu) |
4673 | zone_pageset_init(zone, cpu); | |
319774e2 WF |
4674 | } |
4675 | ||
2caaad41 | 4676 | /* |
99dcc3e5 CL |
4677 | * Allocate per cpu pagesets and initialize them. |
4678 | * Before this call only boot pagesets were available. | |
e7c8d5c9 | 4679 | */ |
99dcc3e5 | 4680 | void __init setup_per_cpu_pageset(void) |
e7c8d5c9 | 4681 | { |
99dcc3e5 | 4682 | struct zone *zone; |
e7c8d5c9 | 4683 | |
319774e2 WF |
4684 | for_each_populated_zone(zone) |
4685 | setup_zone_pageset(zone); | |
e7c8d5c9 CL |
4686 | } |
4687 | ||
577a32f6 | 4688 | static noinline __init_refok |
cca448fe | 4689 | int zone_wait_table_init(struct zone *zone, unsigned long zone_size_pages) |
ed8ece2e DH |
4690 | { |
4691 | int i; | |
cca448fe | 4692 | size_t alloc_size; |
ed8ece2e DH |
4693 | |
4694 | /* | |
4695 | * The per-page waitqueue mechanism uses hashed waitqueues | |
4696 | * per zone. | |
4697 | */ | |
02b694de YG |
4698 | zone->wait_table_hash_nr_entries = |
4699 | wait_table_hash_nr_entries(zone_size_pages); | |
4700 | zone->wait_table_bits = | |
4701 | wait_table_bits(zone->wait_table_hash_nr_entries); | |
cca448fe YG |
4702 | alloc_size = zone->wait_table_hash_nr_entries |
4703 | * sizeof(wait_queue_head_t); | |
4704 | ||
cd94b9db | 4705 | if (!slab_is_available()) { |
cca448fe | 4706 | zone->wait_table = (wait_queue_head_t *) |
6782832e SS |
4707 | memblock_virt_alloc_node_nopanic( |
4708 | alloc_size, zone->zone_pgdat->node_id); | |
cca448fe YG |
4709 | } else { |
4710 | /* | |
4711 | * This case means that a zone whose size was 0 gets new memory | |
4712 | * via memory hot-add. | |
4713 | * But it may be the case that a new node was hot-added. In | |
4714 | * this case vmalloc() will not be able to use this new node's | |
4715 | * memory - this wait_table must be initialized to use this new | |
4716 | * node itself as well. | |
4717 | * To use this new node's memory, further consideration will be | |
4718 | * necessary. | |
4719 | */ | |
8691f3a7 | 4720 | zone->wait_table = vmalloc(alloc_size); |
cca448fe YG |
4721 | } |
4722 | if (!zone->wait_table) | |
4723 | return -ENOMEM; | |
ed8ece2e | 4724 | |
b8af2941 | 4725 | for (i = 0; i < zone->wait_table_hash_nr_entries; ++i) |
ed8ece2e | 4726 | init_waitqueue_head(zone->wait_table + i); |
cca448fe YG |
4727 | |
4728 | return 0; | |
ed8ece2e DH |
4729 | } |
4730 | ||
c09b4240 | 4731 | static __meminit void zone_pcp_init(struct zone *zone) |
ed8ece2e | 4732 | { |
99dcc3e5 CL |
4733 | /* |
4734 | * per cpu subsystem is not up at this point. The following code | |
4735 | * relies on the ability of the linker to provide the | |
4736 | * offset of a (static) per cpu variable into the per cpu area. | |
4737 | */ | |
4738 | zone->pageset = &boot_pageset; | |
ed8ece2e | 4739 | |
b38a8725 | 4740 | if (populated_zone(zone)) |
99dcc3e5 CL |
4741 | printk(KERN_DEBUG " %s zone: %lu pages, LIFO batch:%u\n", |
4742 | zone->name, zone->present_pages, | |
4743 | zone_batchsize(zone)); | |
ed8ece2e DH |
4744 | } |
4745 | ||
4ed7e022 | 4746 | int __meminit init_currently_empty_zone(struct zone *zone, |
718127cc | 4747 | unsigned long zone_start_pfn, |
b171e409 | 4748 | unsigned long size) |
ed8ece2e DH |
4749 | { |
4750 | struct pglist_data *pgdat = zone->zone_pgdat; | |
cca448fe YG |
4751 | int ret; |
4752 | ret = zone_wait_table_init(zone, size); | |
4753 | if (ret) | |
4754 | return ret; | |
ed8ece2e DH |
4755 | pgdat->nr_zones = zone_idx(zone) + 1; |
4756 | ||
ed8ece2e DH |
4757 | zone->zone_start_pfn = zone_start_pfn; |
4758 | ||
708614e6 MG |
4759 | mminit_dprintk(MMINIT_TRACE, "memmap_init", |
4760 | "Initialising map node %d zone %lu pfns %lu -> %lu\n", | |
4761 | pgdat->node_id, | |
4762 | (unsigned long)zone_idx(zone), | |
4763 | zone_start_pfn, (zone_start_pfn + size)); | |
4764 | ||
1e548deb | 4765 | zone_init_free_lists(zone); |
718127cc YG |
4766 | |
4767 | return 0; | |
ed8ece2e DH |
4768 | } |
4769 | ||
0ee332c1 | 4770 | #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP |
c713216d | 4771 | #ifndef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID |
8a942fde | 4772 | |
c713216d MG |
4773 | /* |
4774 | * Required by SPARSEMEM. Given a PFN, return what node the PFN is on. | |
c713216d | 4775 | */ |
8a942fde MG |
4776 | int __meminit __early_pfn_to_nid(unsigned long pfn, |
4777 | struct mminit_pfnnid_cache *state) | |
c713216d | 4778 | { |
c13291a5 | 4779 | unsigned long start_pfn, end_pfn; |
e76b63f8 | 4780 | int nid; |
7c243c71 | 4781 | |
8a942fde MG |
4782 | if (state->last_start <= pfn && pfn < state->last_end) |
4783 | return state->last_nid; | |
c713216d | 4784 | |
e76b63f8 YL |
4785 | nid = memblock_search_pfn_nid(pfn, &start_pfn, &end_pfn); |
4786 | if (nid != -1) { | |
8a942fde MG |
4787 | state->last_start = start_pfn; |
4788 | state->last_end = end_pfn; | |
4789 | state->last_nid = nid; | |
e76b63f8 YL |
4790 | } |
4791 | ||
4792 | return nid; | |
c713216d MG |
4793 | } |
4794 | #endif /* CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID */ | |
4795 | ||
c713216d | 4796 | /** |
6782832e | 4797 | * free_bootmem_with_active_regions - Call memblock_free_early_nid for each active range |
88ca3b94 | 4798 | * @nid: The node to free memory on. If MAX_NUMNODES, all nodes are freed. |
6782832e | 4799 | * @max_low_pfn: The highest PFN that will be passed to memblock_free_early_nid |
c713216d | 4800 | * |
7d018176 ZZ |
4801 | * If an architecture guarantees that all ranges registered contain no holes |
4802 | * and may be freed, this this function may be used instead of calling | |
4803 | * memblock_free_early_nid() manually. | |
c713216d | 4804 | */ |
c13291a5 | 4805 | void __init free_bootmem_with_active_regions(int nid, unsigned long max_low_pfn) |
cc289894 | 4806 | { |
c13291a5 TH |
4807 | unsigned long start_pfn, end_pfn; |
4808 | int i, this_nid; | |
edbe7d23 | 4809 | |
c13291a5 TH |
4810 | for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, &this_nid) { |
4811 | start_pfn = min(start_pfn, max_low_pfn); | |
4812 | end_pfn = min(end_pfn, max_low_pfn); | |
edbe7d23 | 4813 | |
c13291a5 | 4814 | if (start_pfn < end_pfn) |
6782832e SS |
4815 | memblock_free_early_nid(PFN_PHYS(start_pfn), |
4816 | (end_pfn - start_pfn) << PAGE_SHIFT, | |
4817 | this_nid); | |
edbe7d23 | 4818 | } |
edbe7d23 | 4819 | } |
edbe7d23 | 4820 | |
c713216d MG |
4821 | /** |
4822 | * sparse_memory_present_with_active_regions - Call memory_present for each active range | |
88ca3b94 | 4823 | * @nid: The node to call memory_present for. If MAX_NUMNODES, all nodes will be used. |
c713216d | 4824 | * |
7d018176 ZZ |
4825 | * If an architecture guarantees that all ranges registered contain no holes and may |
4826 | * be freed, this function may be used instead of calling memory_present() manually. | |
c713216d MG |
4827 | */ |
4828 | void __init sparse_memory_present_with_active_regions(int nid) | |
4829 | { | |
c13291a5 TH |
4830 | unsigned long start_pfn, end_pfn; |
4831 | int i, this_nid; | |
c713216d | 4832 | |
c13291a5 TH |
4833 | for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, &this_nid) |
4834 | memory_present(this_nid, start_pfn, end_pfn); | |
c713216d MG |
4835 | } |
4836 | ||
4837 | /** | |
4838 | * get_pfn_range_for_nid - Return the start and end page frames for a node | |
88ca3b94 RD |
4839 | * @nid: The nid to return the range for. If MAX_NUMNODES, the min and max PFN are returned. |
4840 | * @start_pfn: Passed by reference. On return, it will have the node start_pfn. | |
4841 | * @end_pfn: Passed by reference. On return, it will have the node end_pfn. | |
c713216d MG |
4842 | * |
4843 | * It returns the start and end page frame of a node based on information | |
7d018176 | 4844 | * provided by memblock_set_node(). If called for a node |
c713216d | 4845 | * with no available memory, a warning is printed and the start and end |
88ca3b94 | 4846 | * PFNs will be 0. |
c713216d | 4847 | */ |
a3142c8e | 4848 | void __meminit get_pfn_range_for_nid(unsigned int nid, |
c713216d MG |
4849 | unsigned long *start_pfn, unsigned long *end_pfn) |
4850 | { | |
c13291a5 | 4851 | unsigned long this_start_pfn, this_end_pfn; |
c713216d | 4852 | int i; |
c13291a5 | 4853 | |
c713216d MG |
4854 | *start_pfn = -1UL; |
4855 | *end_pfn = 0; | |
4856 | ||
c13291a5 TH |
4857 | for_each_mem_pfn_range(i, nid, &this_start_pfn, &this_end_pfn, NULL) { |
4858 | *start_pfn = min(*start_pfn, this_start_pfn); | |
4859 | *end_pfn = max(*end_pfn, this_end_pfn); | |
c713216d MG |
4860 | } |
4861 | ||
633c0666 | 4862 | if (*start_pfn == -1UL) |
c713216d | 4863 | *start_pfn = 0; |
c713216d MG |
4864 | } |
4865 | ||
2a1e274a MG |
4866 | /* |
4867 | * This finds a zone that can be used for ZONE_MOVABLE pages. The | |
4868 | * assumption is made that zones within a node are ordered in monotonic | |
4869 | * increasing memory addresses so that the "highest" populated zone is used | |
4870 | */ | |
b69a7288 | 4871 | static void __init find_usable_zone_for_movable(void) |
2a1e274a MG |
4872 | { |
4873 | int zone_index; | |
4874 | for (zone_index = MAX_NR_ZONES - 1; zone_index >= 0; zone_index--) { | |
4875 | if (zone_index == ZONE_MOVABLE) | |
4876 | continue; | |
4877 | ||
4878 | if (arch_zone_highest_possible_pfn[zone_index] > | |
4879 | arch_zone_lowest_possible_pfn[zone_index]) | |
4880 | break; | |
4881 | } | |
4882 | ||
4883 | VM_BUG_ON(zone_index == -1); | |
4884 | movable_zone = zone_index; | |
4885 | } | |
4886 | ||
4887 | /* | |
4888 | * The zone ranges provided by the architecture do not include ZONE_MOVABLE | |
25985edc | 4889 | * because it is sized independent of architecture. Unlike the other zones, |
2a1e274a MG |
4890 | * the starting point for ZONE_MOVABLE is not fixed. It may be different |
4891 | * in each node depending on the size of each node and how evenly kernelcore | |
4892 | * is distributed. This helper function adjusts the zone ranges | |
4893 | * provided by the architecture for a given node by using the end of the | |
4894 | * highest usable zone for ZONE_MOVABLE. This preserves the assumption that | |
4895 | * zones within a node are in order of monotonic increases memory addresses | |
4896 | */ | |
b69a7288 | 4897 | static void __meminit adjust_zone_range_for_zone_movable(int nid, |
2a1e274a MG |
4898 | unsigned long zone_type, |
4899 | unsigned long node_start_pfn, | |
4900 | unsigned long node_end_pfn, | |
4901 | unsigned long *zone_start_pfn, | |
4902 | unsigned long *zone_end_pfn) | |
4903 | { | |
4904 | /* Only adjust if ZONE_MOVABLE is on this node */ | |
4905 | if (zone_movable_pfn[nid]) { | |
4906 | /* Size ZONE_MOVABLE */ | |
4907 | if (zone_type == ZONE_MOVABLE) { | |
4908 | *zone_start_pfn = zone_movable_pfn[nid]; | |
4909 | *zone_end_pfn = min(node_end_pfn, | |
4910 | arch_zone_highest_possible_pfn[movable_zone]); | |
4911 | ||
4912 | /* Adjust for ZONE_MOVABLE starting within this range */ | |
4913 | } else if (*zone_start_pfn < zone_movable_pfn[nid] && | |
4914 | *zone_end_pfn > zone_movable_pfn[nid]) { | |
4915 | *zone_end_pfn = zone_movable_pfn[nid]; | |
4916 | ||
4917 | /* Check if this whole range is within ZONE_MOVABLE */ | |
4918 | } else if (*zone_start_pfn >= zone_movable_pfn[nid]) | |
4919 | *zone_start_pfn = *zone_end_pfn; | |
4920 | } | |
4921 | } | |
4922 | ||
c713216d MG |
4923 | /* |
4924 | * Return the number of pages a zone spans in a node, including holes | |
4925 | * present_pages = zone_spanned_pages_in_node() - zone_absent_pages_in_node() | |
4926 | */ | |
6ea6e688 | 4927 | static unsigned long __meminit zone_spanned_pages_in_node(int nid, |
c713216d | 4928 | unsigned long zone_type, |
7960aedd ZY |
4929 | unsigned long node_start_pfn, |
4930 | unsigned long node_end_pfn, | |
c713216d MG |
4931 | unsigned long *ignored) |
4932 | { | |
c713216d MG |
4933 | unsigned long zone_start_pfn, zone_end_pfn; |
4934 | ||
b5685e92 | 4935 | /* When hotadd a new node from cpu_up(), the node should be empty */ |
f9126ab9 XQ |
4936 | if (!node_start_pfn && !node_end_pfn) |
4937 | return 0; | |
4938 | ||
7960aedd | 4939 | /* Get the start and end of the zone */ |
c713216d MG |
4940 | zone_start_pfn = arch_zone_lowest_possible_pfn[zone_type]; |
4941 | zone_end_pfn = arch_zone_highest_possible_pfn[zone_type]; | |
2a1e274a MG |
4942 | adjust_zone_range_for_zone_movable(nid, zone_type, |
4943 | node_start_pfn, node_end_pfn, | |
4944 | &zone_start_pfn, &zone_end_pfn); | |
c713216d MG |
4945 | |
4946 | /* Check that this node has pages within the zone's required range */ | |
4947 | if (zone_end_pfn < node_start_pfn || zone_start_pfn > node_end_pfn) | |
4948 | return 0; | |
4949 | ||
4950 | /* Move the zone boundaries inside the node if necessary */ | |
4951 | zone_end_pfn = min(zone_end_pfn, node_end_pfn); | |
4952 | zone_start_pfn = max(zone_start_pfn, node_start_pfn); | |
4953 | ||
4954 | /* Return the spanned pages */ | |
4955 | return zone_end_pfn - zone_start_pfn; | |
4956 | } | |
4957 | ||
4958 | /* | |
4959 | * Return the number of holes in a range on a node. If nid is MAX_NUMNODES, | |
88ca3b94 | 4960 | * then all holes in the requested range will be accounted for. |
c713216d | 4961 | */ |
32996250 | 4962 | unsigned long __meminit __absent_pages_in_range(int nid, |
c713216d MG |
4963 | unsigned long range_start_pfn, |
4964 | unsigned long range_end_pfn) | |
4965 | { | |
96e907d1 TH |
4966 | unsigned long nr_absent = range_end_pfn - range_start_pfn; |
4967 | unsigned long start_pfn, end_pfn; | |
4968 | int i; | |
c713216d | 4969 | |
96e907d1 TH |
4970 | for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, NULL) { |
4971 | start_pfn = clamp(start_pfn, range_start_pfn, range_end_pfn); | |
4972 | end_pfn = clamp(end_pfn, range_start_pfn, range_end_pfn); | |
4973 | nr_absent -= end_pfn - start_pfn; | |
c713216d | 4974 | } |
96e907d1 | 4975 | return nr_absent; |
c713216d MG |
4976 | } |
4977 | ||
4978 | /** | |
4979 | * absent_pages_in_range - Return number of page frames in holes within a range | |
4980 | * @start_pfn: The start PFN to start searching for holes | |
4981 | * @end_pfn: The end PFN to stop searching for holes | |
4982 | * | |
88ca3b94 | 4983 | * It returns the number of pages frames in memory holes within a range. |
c713216d MG |
4984 | */ |
4985 | unsigned long __init absent_pages_in_range(unsigned long start_pfn, | |
4986 | unsigned long end_pfn) | |
4987 | { | |
4988 | return __absent_pages_in_range(MAX_NUMNODES, start_pfn, end_pfn); | |
4989 | } | |
4990 | ||
4991 | /* Return the number of page frames in holes in a zone on a node */ | |
6ea6e688 | 4992 | static unsigned long __meminit zone_absent_pages_in_node(int nid, |
c713216d | 4993 | unsigned long zone_type, |
7960aedd ZY |
4994 | unsigned long node_start_pfn, |
4995 | unsigned long node_end_pfn, | |
c713216d MG |
4996 | unsigned long *ignored) |
4997 | { | |
96e907d1 TH |
4998 | unsigned long zone_low = arch_zone_lowest_possible_pfn[zone_type]; |
4999 | unsigned long zone_high = arch_zone_highest_possible_pfn[zone_type]; | |
9c7cd687 MG |
5000 | unsigned long zone_start_pfn, zone_end_pfn; |
5001 | ||
b5685e92 | 5002 | /* When hotadd a new node from cpu_up(), the node should be empty */ |
f9126ab9 XQ |
5003 | if (!node_start_pfn && !node_end_pfn) |
5004 | return 0; | |
5005 | ||
96e907d1 TH |
5006 | zone_start_pfn = clamp(node_start_pfn, zone_low, zone_high); |
5007 | zone_end_pfn = clamp(node_end_pfn, zone_low, zone_high); | |
9c7cd687 | 5008 | |
2a1e274a MG |
5009 | adjust_zone_range_for_zone_movable(nid, zone_type, |
5010 | node_start_pfn, node_end_pfn, | |
5011 | &zone_start_pfn, &zone_end_pfn); | |
9c7cd687 | 5012 | return __absent_pages_in_range(nid, zone_start_pfn, zone_end_pfn); |
c713216d | 5013 | } |
0e0b864e | 5014 | |
0ee332c1 | 5015 | #else /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ |
6ea6e688 | 5016 | static inline unsigned long __meminit zone_spanned_pages_in_node(int nid, |
c713216d | 5017 | unsigned long zone_type, |
7960aedd ZY |
5018 | unsigned long node_start_pfn, |
5019 | unsigned long node_end_pfn, | |
c713216d MG |
5020 | unsigned long *zones_size) |
5021 | { | |
5022 | return zones_size[zone_type]; | |
5023 | } | |
5024 | ||
6ea6e688 | 5025 | static inline unsigned long __meminit zone_absent_pages_in_node(int nid, |
c713216d | 5026 | unsigned long zone_type, |
7960aedd ZY |
5027 | unsigned long node_start_pfn, |
5028 | unsigned long node_end_pfn, | |
c713216d MG |
5029 | unsigned long *zholes_size) |
5030 | { | |
5031 | if (!zholes_size) | |
5032 | return 0; | |
5033 | ||
5034 | return zholes_size[zone_type]; | |
5035 | } | |
20e6926d | 5036 | |
0ee332c1 | 5037 | #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ |
c713216d | 5038 | |
a3142c8e | 5039 | static void __meminit calculate_node_totalpages(struct pglist_data *pgdat, |
7960aedd ZY |
5040 | unsigned long node_start_pfn, |
5041 | unsigned long node_end_pfn, | |
5042 | unsigned long *zones_size, | |
5043 | unsigned long *zholes_size) | |
c713216d | 5044 | { |
febd5949 | 5045 | unsigned long realtotalpages = 0, totalpages = 0; |
c713216d MG |
5046 | enum zone_type i; |
5047 | ||
febd5949 GZ |
5048 | for (i = 0; i < MAX_NR_ZONES; i++) { |
5049 | struct zone *zone = pgdat->node_zones + i; | |
5050 | unsigned long size, real_size; | |
c713216d | 5051 | |
febd5949 GZ |
5052 | size = zone_spanned_pages_in_node(pgdat->node_id, i, |
5053 | node_start_pfn, | |
5054 | node_end_pfn, | |
5055 | zones_size); | |
5056 | real_size = size - zone_absent_pages_in_node(pgdat->node_id, i, | |
7960aedd ZY |
5057 | node_start_pfn, node_end_pfn, |
5058 | zholes_size); | |
febd5949 GZ |
5059 | zone->spanned_pages = size; |
5060 | zone->present_pages = real_size; | |
5061 | ||
5062 | totalpages += size; | |
5063 | realtotalpages += real_size; | |
5064 | } | |
5065 | ||
5066 | pgdat->node_spanned_pages = totalpages; | |
c713216d MG |
5067 | pgdat->node_present_pages = realtotalpages; |
5068 | printk(KERN_DEBUG "On node %d totalpages: %lu\n", pgdat->node_id, | |
5069 | realtotalpages); | |
5070 | } | |
5071 | ||
835c134e MG |
5072 | #ifndef CONFIG_SPARSEMEM |
5073 | /* | |
5074 | * Calculate the size of the zone->blockflags rounded to an unsigned long | |
d9c23400 MG |
5075 | * Start by making sure zonesize is a multiple of pageblock_order by rounding |
5076 | * up. Then use 1 NR_PAGEBLOCK_BITS worth of bits per pageblock, finally | |
835c134e MG |
5077 | * round what is now in bits to nearest long in bits, then return it in |
5078 | * bytes. | |
5079 | */ | |
7c45512d | 5080 | static unsigned long __init usemap_size(unsigned long zone_start_pfn, unsigned long zonesize) |
835c134e MG |
5081 | { |
5082 | unsigned long usemapsize; | |
5083 | ||
7c45512d | 5084 | zonesize += zone_start_pfn & (pageblock_nr_pages-1); |
d9c23400 MG |
5085 | usemapsize = roundup(zonesize, pageblock_nr_pages); |
5086 | usemapsize = usemapsize >> pageblock_order; | |
835c134e MG |
5087 | usemapsize *= NR_PAGEBLOCK_BITS; |
5088 | usemapsize = roundup(usemapsize, 8 * sizeof(unsigned long)); | |
5089 | ||
5090 | return usemapsize / 8; | |
5091 | } | |
5092 | ||
5093 | static void __init setup_usemap(struct pglist_data *pgdat, | |
7c45512d LT |
5094 | struct zone *zone, |
5095 | unsigned long zone_start_pfn, | |
5096 | unsigned long zonesize) | |
835c134e | 5097 | { |
7c45512d | 5098 | unsigned long usemapsize = usemap_size(zone_start_pfn, zonesize); |
835c134e | 5099 | zone->pageblock_flags = NULL; |
58a01a45 | 5100 | if (usemapsize) |
6782832e SS |
5101 | zone->pageblock_flags = |
5102 | memblock_virt_alloc_node_nopanic(usemapsize, | |
5103 | pgdat->node_id); | |
835c134e MG |
5104 | } |
5105 | #else | |
7c45512d LT |
5106 | static inline void setup_usemap(struct pglist_data *pgdat, struct zone *zone, |
5107 | unsigned long zone_start_pfn, unsigned long zonesize) {} | |
835c134e MG |
5108 | #endif /* CONFIG_SPARSEMEM */ |
5109 | ||
d9c23400 | 5110 | #ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE |
ba72cb8c | 5111 | |
d9c23400 | 5112 | /* Initialise the number of pages represented by NR_PAGEBLOCK_BITS */ |
15ca220e | 5113 | void __paginginit set_pageblock_order(void) |
d9c23400 | 5114 | { |
955c1cd7 AM |
5115 | unsigned int order; |
5116 | ||
d9c23400 MG |
5117 | /* Check that pageblock_nr_pages has not already been setup */ |
5118 | if (pageblock_order) | |
5119 | return; | |
5120 | ||
955c1cd7 AM |
5121 | if (HPAGE_SHIFT > PAGE_SHIFT) |
5122 | order = HUGETLB_PAGE_ORDER; | |
5123 | else | |
5124 | order = MAX_ORDER - 1; | |
5125 | ||
d9c23400 MG |
5126 | /* |
5127 | * Assume the largest contiguous order of interest is a huge page. | |
955c1cd7 AM |
5128 | * This value may be variable depending on boot parameters on IA64 and |
5129 | * powerpc. | |
d9c23400 MG |
5130 | */ |
5131 | pageblock_order = order; | |
5132 | } | |
5133 | #else /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */ | |
5134 | ||
ba72cb8c MG |
5135 | /* |
5136 | * When CONFIG_HUGETLB_PAGE_SIZE_VARIABLE is not set, set_pageblock_order() | |
955c1cd7 AM |
5137 | * is unused as pageblock_order is set at compile-time. See |
5138 | * include/linux/pageblock-flags.h for the values of pageblock_order based on | |
5139 | * the kernel config | |
ba72cb8c | 5140 | */ |
15ca220e | 5141 | void __paginginit set_pageblock_order(void) |
ba72cb8c | 5142 | { |
ba72cb8c | 5143 | } |
d9c23400 MG |
5144 | |
5145 | #endif /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */ | |
5146 | ||
01cefaef JL |
5147 | static unsigned long __paginginit calc_memmap_size(unsigned long spanned_pages, |
5148 | unsigned long present_pages) | |
5149 | { | |
5150 | unsigned long pages = spanned_pages; | |
5151 | ||
5152 | /* | |
5153 | * Provide a more accurate estimation if there are holes within | |
5154 | * the zone and SPARSEMEM is in use. If there are holes within the | |
5155 | * zone, each populated memory region may cost us one or two extra | |
5156 | * memmap pages due to alignment because memmap pages for each | |
5157 | * populated regions may not naturally algined on page boundary. | |
5158 | * So the (present_pages >> 4) heuristic is a tradeoff for that. | |
5159 | */ | |
5160 | if (spanned_pages > present_pages + (present_pages >> 4) && | |
5161 | IS_ENABLED(CONFIG_SPARSEMEM)) | |
5162 | pages = present_pages; | |
5163 | ||
5164 | return PAGE_ALIGN(pages * sizeof(struct page)) >> PAGE_SHIFT; | |
5165 | } | |
5166 | ||
1da177e4 LT |
5167 | /* |
5168 | * Set up the zone data structures: | |
5169 | * - mark all pages reserved | |
5170 | * - mark all memory queues empty | |
5171 | * - clear the memory bitmaps | |
6527af5d MK |
5172 | * |
5173 | * NOTE: pgdat should get zeroed by caller. | |
1da177e4 | 5174 | */ |
7f3eb55b | 5175 | static void __paginginit free_area_init_core(struct pglist_data *pgdat) |
1da177e4 | 5176 | { |
2f1b6248 | 5177 | enum zone_type j; |
ed8ece2e | 5178 | int nid = pgdat->node_id; |
1da177e4 | 5179 | unsigned long zone_start_pfn = pgdat->node_start_pfn; |
718127cc | 5180 | int ret; |
1da177e4 | 5181 | |
208d54e5 | 5182 | pgdat_resize_init(pgdat); |
8177a420 AA |
5183 | #ifdef CONFIG_NUMA_BALANCING |
5184 | spin_lock_init(&pgdat->numabalancing_migrate_lock); | |
5185 | pgdat->numabalancing_migrate_nr_pages = 0; | |
5186 | pgdat->numabalancing_migrate_next_window = jiffies; | |
5187 | #endif | |
1da177e4 | 5188 | init_waitqueue_head(&pgdat->kswapd_wait); |
5515061d | 5189 | init_waitqueue_head(&pgdat->pfmemalloc_wait); |
eefa864b | 5190 | pgdat_page_ext_init(pgdat); |
5f63b720 | 5191 | |
1da177e4 LT |
5192 | for (j = 0; j < MAX_NR_ZONES; j++) { |
5193 | struct zone *zone = pgdat->node_zones + j; | |
9feedc9d | 5194 | unsigned long size, realsize, freesize, memmap_pages; |
1da177e4 | 5195 | |
febd5949 GZ |
5196 | size = zone->spanned_pages; |
5197 | realsize = freesize = zone->present_pages; | |
1da177e4 | 5198 | |
0e0b864e | 5199 | /* |
9feedc9d | 5200 | * Adjust freesize so that it accounts for how much memory |
0e0b864e MG |
5201 | * is used by this zone for memmap. This affects the watermark |
5202 | * and per-cpu initialisations | |
5203 | */ | |
01cefaef | 5204 | memmap_pages = calc_memmap_size(size, realsize); |
ba914f48 ZH |
5205 | if (!is_highmem_idx(j)) { |
5206 | if (freesize >= memmap_pages) { | |
5207 | freesize -= memmap_pages; | |
5208 | if (memmap_pages) | |
5209 | printk(KERN_DEBUG | |
5210 | " %s zone: %lu pages used for memmap\n", | |
5211 | zone_names[j], memmap_pages); | |
5212 | } else | |
5213 | printk(KERN_WARNING | |
5214 | " %s zone: %lu pages exceeds freesize %lu\n", | |
5215 | zone_names[j], memmap_pages, freesize); | |
5216 | } | |
0e0b864e | 5217 | |
6267276f | 5218 | /* Account for reserved pages */ |
9feedc9d JL |
5219 | if (j == 0 && freesize > dma_reserve) { |
5220 | freesize -= dma_reserve; | |
d903ef9f | 5221 | printk(KERN_DEBUG " %s zone: %lu pages reserved\n", |
6267276f | 5222 | zone_names[0], dma_reserve); |
0e0b864e MG |
5223 | } |
5224 | ||
98d2b0eb | 5225 | if (!is_highmem_idx(j)) |
9feedc9d | 5226 | nr_kernel_pages += freesize; |
01cefaef JL |
5227 | /* Charge for highmem memmap if there are enough kernel pages */ |
5228 | else if (nr_kernel_pages > memmap_pages * 2) | |
5229 | nr_kernel_pages -= memmap_pages; | |
9feedc9d | 5230 | nr_all_pages += freesize; |
1da177e4 | 5231 | |
9feedc9d JL |
5232 | /* |
5233 | * Set an approximate value for lowmem here, it will be adjusted | |
5234 | * when the bootmem allocator frees pages into the buddy system. | |
5235 | * And all highmem pages will be managed by the buddy system. | |
5236 | */ | |
5237 | zone->managed_pages = is_highmem_idx(j) ? realsize : freesize; | |
9614634f | 5238 | #ifdef CONFIG_NUMA |
d5f541ed | 5239 | zone->node = nid; |
9feedc9d | 5240 | zone->min_unmapped_pages = (freesize*sysctl_min_unmapped_ratio) |
9614634f | 5241 | / 100; |
9feedc9d | 5242 | zone->min_slab_pages = (freesize * sysctl_min_slab_ratio) / 100; |
9614634f | 5243 | #endif |
1da177e4 LT |
5244 | zone->name = zone_names[j]; |
5245 | spin_lock_init(&zone->lock); | |
5246 | spin_lock_init(&zone->lru_lock); | |
bdc8cb98 | 5247 | zone_seqlock_init(zone); |
1da177e4 | 5248 | zone->zone_pgdat = pgdat; |
ed8ece2e | 5249 | zone_pcp_init(zone); |
81c0a2bb JW |
5250 | |
5251 | /* For bootup, initialized properly in watermark setup */ | |
5252 | mod_zone_page_state(zone, NR_ALLOC_BATCH, zone->managed_pages); | |
5253 | ||
bea8c150 | 5254 | lruvec_init(&zone->lruvec); |
1da177e4 LT |
5255 | if (!size) |
5256 | continue; | |
5257 | ||
955c1cd7 | 5258 | set_pageblock_order(); |
7c45512d | 5259 | setup_usemap(pgdat, zone, zone_start_pfn, size); |
b171e409 | 5260 | ret = init_currently_empty_zone(zone, zone_start_pfn, size); |
718127cc | 5261 | BUG_ON(ret); |
76cdd58e | 5262 | memmap_init(size, nid, j, zone_start_pfn); |
1da177e4 | 5263 | zone_start_pfn += size; |
1da177e4 LT |
5264 | } |
5265 | } | |
5266 | ||
577a32f6 | 5267 | static void __init_refok alloc_node_mem_map(struct pglist_data *pgdat) |
1da177e4 | 5268 | { |
b0aeba74 | 5269 | unsigned long __maybe_unused start = 0; |
a1c34a3b LA |
5270 | unsigned long __maybe_unused offset = 0; |
5271 | ||
1da177e4 LT |
5272 | /* Skip empty nodes */ |
5273 | if (!pgdat->node_spanned_pages) | |
5274 | return; | |
5275 | ||
d41dee36 | 5276 | #ifdef CONFIG_FLAT_NODE_MEM_MAP |
b0aeba74 TL |
5277 | start = pgdat->node_start_pfn & ~(MAX_ORDER_NR_PAGES - 1); |
5278 | offset = pgdat->node_start_pfn - start; | |
1da177e4 LT |
5279 | /* ia64 gets its own node_mem_map, before this, without bootmem */ |
5280 | if (!pgdat->node_mem_map) { | |
b0aeba74 | 5281 | unsigned long size, end; |
d41dee36 AW |
5282 | struct page *map; |
5283 | ||
e984bb43 BP |
5284 | /* |
5285 | * The zone's endpoints aren't required to be MAX_ORDER | |
5286 | * aligned but the node_mem_map endpoints must be in order | |
5287 | * for the buddy allocator to function correctly. | |
5288 | */ | |
108bcc96 | 5289 | end = pgdat_end_pfn(pgdat); |
e984bb43 BP |
5290 | end = ALIGN(end, MAX_ORDER_NR_PAGES); |
5291 | size = (end - start) * sizeof(struct page); | |
6f167ec7 DH |
5292 | map = alloc_remap(pgdat->node_id, size); |
5293 | if (!map) | |
6782832e SS |
5294 | map = memblock_virt_alloc_node_nopanic(size, |
5295 | pgdat->node_id); | |
a1c34a3b | 5296 | pgdat->node_mem_map = map + offset; |
1da177e4 | 5297 | } |
12d810c1 | 5298 | #ifndef CONFIG_NEED_MULTIPLE_NODES |
1da177e4 LT |
5299 | /* |
5300 | * With no DISCONTIG, the global mem_map is just set as node 0's | |
5301 | */ | |
c713216d | 5302 | if (pgdat == NODE_DATA(0)) { |
1da177e4 | 5303 | mem_map = NODE_DATA(0)->node_mem_map; |
a1c34a3b | 5304 | #if defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) || defined(CONFIG_FLATMEM) |
c713216d | 5305 | if (page_to_pfn(mem_map) != pgdat->node_start_pfn) |
a1c34a3b | 5306 | mem_map -= offset; |
0ee332c1 | 5307 | #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ |
c713216d | 5308 | } |
1da177e4 | 5309 | #endif |
d41dee36 | 5310 | #endif /* CONFIG_FLAT_NODE_MEM_MAP */ |
1da177e4 LT |
5311 | } |
5312 | ||
9109fb7b JW |
5313 | void __paginginit free_area_init_node(int nid, unsigned long *zones_size, |
5314 | unsigned long node_start_pfn, unsigned long *zholes_size) | |
1da177e4 | 5315 | { |
9109fb7b | 5316 | pg_data_t *pgdat = NODE_DATA(nid); |
7960aedd ZY |
5317 | unsigned long start_pfn = 0; |
5318 | unsigned long end_pfn = 0; | |
9109fb7b | 5319 | |
88fdf75d | 5320 | /* pg_data_t should be reset to zero when it's allocated */ |
8783b6e2 | 5321 | WARN_ON(pgdat->nr_zones || pgdat->classzone_idx); |
88fdf75d | 5322 | |
3a80a7fa | 5323 | reset_deferred_meminit(pgdat); |
1da177e4 LT |
5324 | pgdat->node_id = nid; |
5325 | pgdat->node_start_pfn = node_start_pfn; | |
7960aedd ZY |
5326 | #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP |
5327 | get_pfn_range_for_nid(nid, &start_pfn, &end_pfn); | |
8d29e18a | 5328 | pr_info("Initmem setup node %d [mem %#018Lx-%#018Lx]\n", nid, |
4ada0c5a ZL |
5329 | (u64)start_pfn << PAGE_SHIFT, |
5330 | end_pfn ? ((u64)end_pfn << PAGE_SHIFT) - 1 : 0); | |
7960aedd ZY |
5331 | #endif |
5332 | calculate_node_totalpages(pgdat, start_pfn, end_pfn, | |
5333 | zones_size, zholes_size); | |
1da177e4 LT |
5334 | |
5335 | alloc_node_mem_map(pgdat); | |
e8c27ac9 YL |
5336 | #ifdef CONFIG_FLAT_NODE_MEM_MAP |
5337 | printk(KERN_DEBUG "free_area_init_node: node %d, pgdat %08lx, node_mem_map %08lx\n", | |
5338 | nid, (unsigned long)pgdat, | |
5339 | (unsigned long)pgdat->node_mem_map); | |
5340 | #endif | |
1da177e4 | 5341 | |
7f3eb55b | 5342 | free_area_init_core(pgdat); |
1da177e4 LT |
5343 | } |
5344 | ||
0ee332c1 | 5345 | #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP |
418508c1 MS |
5346 | |
5347 | #if MAX_NUMNODES > 1 | |
5348 | /* | |
5349 | * Figure out the number of possible node ids. | |
5350 | */ | |
f9872caf | 5351 | void __init setup_nr_node_ids(void) |
418508c1 | 5352 | { |
904a9553 | 5353 | unsigned int highest; |
418508c1 | 5354 | |
904a9553 | 5355 | highest = find_last_bit(node_possible_map.bits, MAX_NUMNODES); |
418508c1 MS |
5356 | nr_node_ids = highest + 1; |
5357 | } | |
418508c1 MS |
5358 | #endif |
5359 | ||
1e01979c TH |
5360 | /** |
5361 | * node_map_pfn_alignment - determine the maximum internode alignment | |
5362 | * | |
5363 | * This function should be called after node map is populated and sorted. | |
5364 | * It calculates the maximum power of two alignment which can distinguish | |
5365 | * all the nodes. | |
5366 | * | |
5367 | * For example, if all nodes are 1GiB and aligned to 1GiB, the return value | |
5368 | * would indicate 1GiB alignment with (1 << (30 - PAGE_SHIFT)). If the | |
5369 | * nodes are shifted by 256MiB, 256MiB. Note that if only the last node is | |
5370 | * shifted, 1GiB is enough and this function will indicate so. | |
5371 | * | |
5372 | * This is used to test whether pfn -> nid mapping of the chosen memory | |
5373 | * model has fine enough granularity to avoid incorrect mapping for the | |
5374 | * populated node map. | |
5375 | * | |
5376 | * Returns the determined alignment in pfn's. 0 if there is no alignment | |
5377 | * requirement (single node). | |
5378 | */ | |
5379 | unsigned long __init node_map_pfn_alignment(void) | |
5380 | { | |
5381 | unsigned long accl_mask = 0, last_end = 0; | |
c13291a5 | 5382 | unsigned long start, end, mask; |
1e01979c | 5383 | int last_nid = -1; |
c13291a5 | 5384 | int i, nid; |
1e01979c | 5385 | |
c13291a5 | 5386 | for_each_mem_pfn_range(i, MAX_NUMNODES, &start, &end, &nid) { |
1e01979c TH |
5387 | if (!start || last_nid < 0 || last_nid == nid) { |
5388 | last_nid = nid; | |
5389 | last_end = end; | |
5390 | continue; | |
5391 | } | |
5392 | ||
5393 | /* | |
5394 | * Start with a mask granular enough to pin-point to the | |
5395 | * start pfn and tick off bits one-by-one until it becomes | |
5396 | * too coarse to separate the current node from the last. | |
5397 | */ | |
5398 | mask = ~((1 << __ffs(start)) - 1); | |
5399 | while (mask && last_end <= (start & (mask << 1))) | |
5400 | mask <<= 1; | |
5401 | ||
5402 | /* accumulate all internode masks */ | |
5403 | accl_mask |= mask; | |
5404 | } | |
5405 | ||
5406 | /* convert mask to number of pages */ | |
5407 | return ~accl_mask + 1; | |
5408 | } | |
5409 | ||
a6af2bc3 | 5410 | /* Find the lowest pfn for a node */ |
b69a7288 | 5411 | static unsigned long __init find_min_pfn_for_node(int nid) |
c713216d | 5412 | { |
a6af2bc3 | 5413 | unsigned long min_pfn = ULONG_MAX; |
c13291a5 TH |
5414 | unsigned long start_pfn; |
5415 | int i; | |
1abbfb41 | 5416 | |
c13291a5 TH |
5417 | for_each_mem_pfn_range(i, nid, &start_pfn, NULL, NULL) |
5418 | min_pfn = min(min_pfn, start_pfn); | |
c713216d | 5419 | |
a6af2bc3 MG |
5420 | if (min_pfn == ULONG_MAX) { |
5421 | printk(KERN_WARNING | |
2bc0d261 | 5422 | "Could not find start_pfn for node %d\n", nid); |
a6af2bc3 MG |
5423 | return 0; |
5424 | } | |
5425 | ||
5426 | return min_pfn; | |
c713216d MG |
5427 | } |
5428 | ||
5429 | /** | |
5430 | * find_min_pfn_with_active_regions - Find the minimum PFN registered | |
5431 | * | |
5432 | * It returns the minimum PFN based on information provided via | |
7d018176 | 5433 | * memblock_set_node(). |
c713216d MG |
5434 | */ |
5435 | unsigned long __init find_min_pfn_with_active_regions(void) | |
5436 | { | |
5437 | return find_min_pfn_for_node(MAX_NUMNODES); | |
5438 | } | |
5439 | ||
37b07e41 LS |
5440 | /* |
5441 | * early_calculate_totalpages() | |
5442 | * Sum pages in active regions for movable zone. | |
4b0ef1fe | 5443 | * Populate N_MEMORY for calculating usable_nodes. |
37b07e41 | 5444 | */ |
484f51f8 | 5445 | static unsigned long __init early_calculate_totalpages(void) |
7e63efef | 5446 | { |
7e63efef | 5447 | unsigned long totalpages = 0; |
c13291a5 TH |
5448 | unsigned long start_pfn, end_pfn; |
5449 | int i, nid; | |
5450 | ||
5451 | for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, &nid) { | |
5452 | unsigned long pages = end_pfn - start_pfn; | |
7e63efef | 5453 | |
37b07e41 LS |
5454 | totalpages += pages; |
5455 | if (pages) | |
4b0ef1fe | 5456 | node_set_state(nid, N_MEMORY); |
37b07e41 | 5457 | } |
b8af2941 | 5458 | return totalpages; |
7e63efef MG |
5459 | } |
5460 | ||
2a1e274a MG |
5461 | /* |
5462 | * Find the PFN the Movable zone begins in each node. Kernel memory | |
5463 | * is spread evenly between nodes as long as the nodes have enough | |
5464 | * memory. When they don't, some nodes will have more kernelcore than | |
5465 | * others | |
5466 | */ | |
b224ef85 | 5467 | static void __init find_zone_movable_pfns_for_nodes(void) |
2a1e274a MG |
5468 | { |
5469 | int i, nid; | |
5470 | unsigned long usable_startpfn; | |
5471 | unsigned long kernelcore_node, kernelcore_remaining; | |
66918dcd | 5472 | /* save the state before borrow the nodemask */ |
4b0ef1fe | 5473 | nodemask_t saved_node_state = node_states[N_MEMORY]; |
37b07e41 | 5474 | unsigned long totalpages = early_calculate_totalpages(); |
4b0ef1fe | 5475 | int usable_nodes = nodes_weight(node_states[N_MEMORY]); |
136199f0 | 5476 | struct memblock_region *r; |
b2f3eebe TC |
5477 | |
5478 | /* Need to find movable_zone earlier when movable_node is specified. */ | |
5479 | find_usable_zone_for_movable(); | |
5480 | ||
5481 | /* | |
5482 | * If movable_node is specified, ignore kernelcore and movablecore | |
5483 | * options. | |
5484 | */ | |
5485 | if (movable_node_is_enabled()) { | |
136199f0 EM |
5486 | for_each_memblock(memory, r) { |
5487 | if (!memblock_is_hotpluggable(r)) | |
b2f3eebe TC |
5488 | continue; |
5489 | ||
136199f0 | 5490 | nid = r->nid; |
b2f3eebe | 5491 | |
136199f0 | 5492 | usable_startpfn = PFN_DOWN(r->base); |
b2f3eebe TC |
5493 | zone_movable_pfn[nid] = zone_movable_pfn[nid] ? |
5494 | min(usable_startpfn, zone_movable_pfn[nid]) : | |
5495 | usable_startpfn; | |
5496 | } | |
5497 | ||
5498 | goto out2; | |
5499 | } | |
2a1e274a | 5500 | |
7e63efef | 5501 | /* |
b2f3eebe | 5502 | * If movablecore=nn[KMG] was specified, calculate what size of |
7e63efef MG |
5503 | * kernelcore that corresponds so that memory usable for |
5504 | * any allocation type is evenly spread. If both kernelcore | |
5505 | * and movablecore are specified, then the value of kernelcore | |
5506 | * will be used for required_kernelcore if it's greater than | |
5507 | * what movablecore would have allowed. | |
5508 | */ | |
5509 | if (required_movablecore) { | |
7e63efef MG |
5510 | unsigned long corepages; |
5511 | ||
5512 | /* | |
5513 | * Round-up so that ZONE_MOVABLE is at least as large as what | |
5514 | * was requested by the user | |
5515 | */ | |
5516 | required_movablecore = | |
5517 | roundup(required_movablecore, MAX_ORDER_NR_PAGES); | |
9fd745d4 | 5518 | required_movablecore = min(totalpages, required_movablecore); |
7e63efef MG |
5519 | corepages = totalpages - required_movablecore; |
5520 | ||
5521 | required_kernelcore = max(required_kernelcore, corepages); | |
5522 | } | |
5523 | ||
bde304bd XQ |
5524 | /* |
5525 | * If kernelcore was not specified or kernelcore size is larger | |
5526 | * than totalpages, there is no ZONE_MOVABLE. | |
5527 | */ | |
5528 | if (!required_kernelcore || required_kernelcore >= totalpages) | |
66918dcd | 5529 | goto out; |
2a1e274a MG |
5530 | |
5531 | /* usable_startpfn is the lowest possible pfn ZONE_MOVABLE can be at */ | |
2a1e274a MG |
5532 | usable_startpfn = arch_zone_lowest_possible_pfn[movable_zone]; |
5533 | ||
5534 | restart: | |
5535 | /* Spread kernelcore memory as evenly as possible throughout nodes */ | |
5536 | kernelcore_node = required_kernelcore / usable_nodes; | |
4b0ef1fe | 5537 | for_each_node_state(nid, N_MEMORY) { |
c13291a5 TH |
5538 | unsigned long start_pfn, end_pfn; |
5539 | ||
2a1e274a MG |
5540 | /* |
5541 | * Recalculate kernelcore_node if the division per node | |
5542 | * now exceeds what is necessary to satisfy the requested | |
5543 | * amount of memory for the kernel | |
5544 | */ | |
5545 | if (required_kernelcore < kernelcore_node) | |
5546 | kernelcore_node = required_kernelcore / usable_nodes; | |
5547 | ||
5548 | /* | |
5549 | * As the map is walked, we track how much memory is usable | |
5550 | * by the kernel using kernelcore_remaining. When it is | |
5551 | * 0, the rest of the node is usable by ZONE_MOVABLE | |
5552 | */ | |
5553 | kernelcore_remaining = kernelcore_node; | |
5554 | ||
5555 | /* Go through each range of PFNs within this node */ | |
c13291a5 | 5556 | for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, NULL) { |
2a1e274a MG |
5557 | unsigned long size_pages; |
5558 | ||
c13291a5 | 5559 | start_pfn = max(start_pfn, zone_movable_pfn[nid]); |
2a1e274a MG |
5560 | if (start_pfn >= end_pfn) |
5561 | continue; | |
5562 | ||
5563 | /* Account for what is only usable for kernelcore */ | |
5564 | if (start_pfn < usable_startpfn) { | |
5565 | unsigned long kernel_pages; | |
5566 | kernel_pages = min(end_pfn, usable_startpfn) | |
5567 | - start_pfn; | |
5568 | ||
5569 | kernelcore_remaining -= min(kernel_pages, | |
5570 | kernelcore_remaining); | |
5571 | required_kernelcore -= min(kernel_pages, | |
5572 | required_kernelcore); | |
5573 | ||
5574 | /* Continue if range is now fully accounted */ | |
5575 | if (end_pfn <= usable_startpfn) { | |
5576 | ||
5577 | /* | |
5578 | * Push zone_movable_pfn to the end so | |
5579 | * that if we have to rebalance | |
5580 | * kernelcore across nodes, we will | |
5581 | * not double account here | |
5582 | */ | |
5583 | zone_movable_pfn[nid] = end_pfn; | |
5584 | continue; | |
5585 | } | |
5586 | start_pfn = usable_startpfn; | |
5587 | } | |
5588 | ||
5589 | /* | |
5590 | * The usable PFN range for ZONE_MOVABLE is from | |
5591 | * start_pfn->end_pfn. Calculate size_pages as the | |
5592 | * number of pages used as kernelcore | |
5593 | */ | |
5594 | size_pages = end_pfn - start_pfn; | |
5595 | if (size_pages > kernelcore_remaining) | |
5596 | size_pages = kernelcore_remaining; | |
5597 | zone_movable_pfn[nid] = start_pfn + size_pages; | |
5598 | ||
5599 | /* | |
5600 | * Some kernelcore has been met, update counts and | |
5601 | * break if the kernelcore for this node has been | |
b8af2941 | 5602 | * satisfied |
2a1e274a MG |
5603 | */ |
5604 | required_kernelcore -= min(required_kernelcore, | |
5605 | size_pages); | |
5606 | kernelcore_remaining -= size_pages; | |
5607 | if (!kernelcore_remaining) | |
5608 | break; | |
5609 | } | |
5610 | } | |
5611 | ||
5612 | /* | |
5613 | * If there is still required_kernelcore, we do another pass with one | |
5614 | * less node in the count. This will push zone_movable_pfn[nid] further | |
5615 | * along on the nodes that still have memory until kernelcore is | |
b8af2941 | 5616 | * satisfied |
2a1e274a MG |
5617 | */ |
5618 | usable_nodes--; | |
5619 | if (usable_nodes && required_kernelcore > usable_nodes) | |
5620 | goto restart; | |
5621 | ||
b2f3eebe | 5622 | out2: |
2a1e274a MG |
5623 | /* Align start of ZONE_MOVABLE on all nids to MAX_ORDER_NR_PAGES */ |
5624 | for (nid = 0; nid < MAX_NUMNODES; nid++) | |
5625 | zone_movable_pfn[nid] = | |
5626 | roundup(zone_movable_pfn[nid], MAX_ORDER_NR_PAGES); | |
66918dcd | 5627 | |
20e6926d | 5628 | out: |
66918dcd | 5629 | /* restore the node_state */ |
4b0ef1fe | 5630 | node_states[N_MEMORY] = saved_node_state; |
2a1e274a MG |
5631 | } |
5632 | ||
4b0ef1fe LJ |
5633 | /* Any regular or high memory on that node ? */ |
5634 | static void check_for_memory(pg_data_t *pgdat, int nid) | |
37b07e41 | 5635 | { |
37b07e41 LS |
5636 | enum zone_type zone_type; |
5637 | ||
4b0ef1fe LJ |
5638 | if (N_MEMORY == N_NORMAL_MEMORY) |
5639 | return; | |
5640 | ||
5641 | for (zone_type = 0; zone_type <= ZONE_MOVABLE - 1; zone_type++) { | |
37b07e41 | 5642 | struct zone *zone = &pgdat->node_zones[zone_type]; |
b38a8725 | 5643 | if (populated_zone(zone)) { |
4b0ef1fe LJ |
5644 | node_set_state(nid, N_HIGH_MEMORY); |
5645 | if (N_NORMAL_MEMORY != N_HIGH_MEMORY && | |
5646 | zone_type <= ZONE_NORMAL) | |
5647 | node_set_state(nid, N_NORMAL_MEMORY); | |
d0048b0e BL |
5648 | break; |
5649 | } | |
37b07e41 | 5650 | } |
37b07e41 LS |
5651 | } |
5652 | ||
c713216d MG |
5653 | /** |
5654 | * free_area_init_nodes - Initialise all pg_data_t and zone data | |
88ca3b94 | 5655 | * @max_zone_pfn: an array of max PFNs for each zone |
c713216d MG |
5656 | * |
5657 | * This will call free_area_init_node() for each active node in the system. | |
7d018176 | 5658 | * Using the page ranges provided by memblock_set_node(), the size of each |
c713216d MG |
5659 | * zone in each node and their holes is calculated. If the maximum PFN |
5660 | * between two adjacent zones match, it is assumed that the zone is empty. | |
5661 | * For example, if arch_max_dma_pfn == arch_max_dma32_pfn, it is assumed | |
5662 | * that arch_max_dma32_pfn has no pages. It is also assumed that a zone | |
5663 | * starts where the previous one ended. For example, ZONE_DMA32 starts | |
5664 | * at arch_max_dma_pfn. | |
5665 | */ | |
5666 | void __init free_area_init_nodes(unsigned long *max_zone_pfn) | |
5667 | { | |
c13291a5 TH |
5668 | unsigned long start_pfn, end_pfn; |
5669 | int i, nid; | |
a6af2bc3 | 5670 | |
c713216d MG |
5671 | /* Record where the zone boundaries are */ |
5672 | memset(arch_zone_lowest_possible_pfn, 0, | |
5673 | sizeof(arch_zone_lowest_possible_pfn)); | |
5674 | memset(arch_zone_highest_possible_pfn, 0, | |
5675 | sizeof(arch_zone_highest_possible_pfn)); | |
5676 | arch_zone_lowest_possible_pfn[0] = find_min_pfn_with_active_regions(); | |
5677 | arch_zone_highest_possible_pfn[0] = max_zone_pfn[0]; | |
5678 | for (i = 1; i < MAX_NR_ZONES; i++) { | |
2a1e274a MG |
5679 | if (i == ZONE_MOVABLE) |
5680 | continue; | |
c713216d MG |
5681 | arch_zone_lowest_possible_pfn[i] = |
5682 | arch_zone_highest_possible_pfn[i-1]; | |
5683 | arch_zone_highest_possible_pfn[i] = | |
5684 | max(max_zone_pfn[i], arch_zone_lowest_possible_pfn[i]); | |
5685 | } | |
2a1e274a MG |
5686 | arch_zone_lowest_possible_pfn[ZONE_MOVABLE] = 0; |
5687 | arch_zone_highest_possible_pfn[ZONE_MOVABLE] = 0; | |
5688 | ||
5689 | /* Find the PFNs that ZONE_MOVABLE begins at in each node */ | |
5690 | memset(zone_movable_pfn, 0, sizeof(zone_movable_pfn)); | |
b224ef85 | 5691 | find_zone_movable_pfns_for_nodes(); |
c713216d | 5692 | |
c713216d | 5693 | /* Print out the zone ranges */ |
f88dfff5 | 5694 | pr_info("Zone ranges:\n"); |
2a1e274a MG |
5695 | for (i = 0; i < MAX_NR_ZONES; i++) { |
5696 | if (i == ZONE_MOVABLE) | |
5697 | continue; | |
f88dfff5 | 5698 | pr_info(" %-8s ", zone_names[i]); |
72f0ba02 DR |
5699 | if (arch_zone_lowest_possible_pfn[i] == |
5700 | arch_zone_highest_possible_pfn[i]) | |
f88dfff5 | 5701 | pr_cont("empty\n"); |
72f0ba02 | 5702 | else |
8d29e18a JG |
5703 | pr_cont("[mem %#018Lx-%#018Lx]\n", |
5704 | (u64)arch_zone_lowest_possible_pfn[i] | |
5705 | << PAGE_SHIFT, | |
5706 | ((u64)arch_zone_highest_possible_pfn[i] | |
a62e2f4f | 5707 | << PAGE_SHIFT) - 1); |
2a1e274a MG |
5708 | } |
5709 | ||
5710 | /* Print out the PFNs ZONE_MOVABLE begins at in each node */ | |
f88dfff5 | 5711 | pr_info("Movable zone start for each node\n"); |
2a1e274a MG |
5712 | for (i = 0; i < MAX_NUMNODES; i++) { |
5713 | if (zone_movable_pfn[i]) | |
8d29e18a JG |
5714 | pr_info(" Node %d: %#018Lx\n", i, |
5715 | (u64)zone_movable_pfn[i] << PAGE_SHIFT); | |
2a1e274a | 5716 | } |
c713216d | 5717 | |
f2d52fe5 | 5718 | /* Print out the early node map */ |
f88dfff5 | 5719 | pr_info("Early memory node ranges\n"); |
c13291a5 | 5720 | for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, &nid) |
8d29e18a JG |
5721 | pr_info(" node %3d: [mem %#018Lx-%#018Lx]\n", nid, |
5722 | (u64)start_pfn << PAGE_SHIFT, | |
5723 | ((u64)end_pfn << PAGE_SHIFT) - 1); | |
c713216d MG |
5724 | |
5725 | /* Initialise every node */ | |
708614e6 | 5726 | mminit_verify_pageflags_layout(); |
8ef82866 | 5727 | setup_nr_node_ids(); |
c713216d MG |
5728 | for_each_online_node(nid) { |
5729 | pg_data_t *pgdat = NODE_DATA(nid); | |
9109fb7b | 5730 | free_area_init_node(nid, NULL, |
c713216d | 5731 | find_min_pfn_for_node(nid), NULL); |
37b07e41 LS |
5732 | |
5733 | /* Any memory on that node */ | |
5734 | if (pgdat->node_present_pages) | |
4b0ef1fe LJ |
5735 | node_set_state(nid, N_MEMORY); |
5736 | check_for_memory(pgdat, nid); | |
c713216d MG |
5737 | } |
5738 | } | |
2a1e274a | 5739 | |
7e63efef | 5740 | static int __init cmdline_parse_core(char *p, unsigned long *core) |
2a1e274a MG |
5741 | { |
5742 | unsigned long long coremem; | |
5743 | if (!p) | |
5744 | return -EINVAL; | |
5745 | ||
5746 | coremem = memparse(p, &p); | |
7e63efef | 5747 | *core = coremem >> PAGE_SHIFT; |
2a1e274a | 5748 | |
7e63efef | 5749 | /* Paranoid check that UL is enough for the coremem value */ |
2a1e274a MG |
5750 | WARN_ON((coremem >> PAGE_SHIFT) > ULONG_MAX); |
5751 | ||
5752 | return 0; | |
5753 | } | |
ed7ed365 | 5754 | |
7e63efef MG |
5755 | /* |
5756 | * kernelcore=size sets the amount of memory for use for allocations that | |
5757 | * cannot be reclaimed or migrated. | |
5758 | */ | |
5759 | static int __init cmdline_parse_kernelcore(char *p) | |
5760 | { | |
5761 | return cmdline_parse_core(p, &required_kernelcore); | |
5762 | } | |
5763 | ||
5764 | /* | |
5765 | * movablecore=size sets the amount of memory for use for allocations that | |
5766 | * can be reclaimed or migrated. | |
5767 | */ | |
5768 | static int __init cmdline_parse_movablecore(char *p) | |
5769 | { | |
5770 | return cmdline_parse_core(p, &required_movablecore); | |
5771 | } | |
5772 | ||
ed7ed365 | 5773 | early_param("kernelcore", cmdline_parse_kernelcore); |
7e63efef | 5774 | early_param("movablecore", cmdline_parse_movablecore); |
ed7ed365 | 5775 | |
0ee332c1 | 5776 | #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ |
c713216d | 5777 | |
c3d5f5f0 JL |
5778 | void adjust_managed_page_count(struct page *page, long count) |
5779 | { | |
5780 | spin_lock(&managed_page_count_lock); | |
5781 | page_zone(page)->managed_pages += count; | |
5782 | totalram_pages += count; | |
3dcc0571 JL |
5783 | #ifdef CONFIG_HIGHMEM |
5784 | if (PageHighMem(page)) | |
5785 | totalhigh_pages += count; | |
5786 | #endif | |
c3d5f5f0 JL |
5787 | spin_unlock(&managed_page_count_lock); |
5788 | } | |
3dcc0571 | 5789 | EXPORT_SYMBOL(adjust_managed_page_count); |
c3d5f5f0 | 5790 | |
11199692 | 5791 | unsigned long free_reserved_area(void *start, void *end, int poison, char *s) |
69afade7 | 5792 | { |
11199692 JL |
5793 | void *pos; |
5794 | unsigned long pages = 0; | |
69afade7 | 5795 | |
11199692 JL |
5796 | start = (void *)PAGE_ALIGN((unsigned long)start); |
5797 | end = (void *)((unsigned long)end & PAGE_MASK); | |
5798 | for (pos = start; pos < end; pos += PAGE_SIZE, pages++) { | |
dbe67df4 | 5799 | if ((unsigned int)poison <= 0xFF) |
11199692 JL |
5800 | memset(pos, poison, PAGE_SIZE); |
5801 | free_reserved_page(virt_to_page(pos)); | |
69afade7 JL |
5802 | } |
5803 | ||
5804 | if (pages && s) | |
11199692 | 5805 | pr_info("Freeing %s memory: %ldK (%p - %p)\n", |
69afade7 JL |
5806 | s, pages << (PAGE_SHIFT - 10), start, end); |
5807 | ||
5808 | return pages; | |
5809 | } | |
11199692 | 5810 | EXPORT_SYMBOL(free_reserved_area); |
69afade7 | 5811 | |
cfa11e08 JL |
5812 | #ifdef CONFIG_HIGHMEM |
5813 | void free_highmem_page(struct page *page) | |
5814 | { | |
5815 | __free_reserved_page(page); | |
5816 | totalram_pages++; | |
7b4b2a0d | 5817 | page_zone(page)->managed_pages++; |
cfa11e08 JL |
5818 | totalhigh_pages++; |
5819 | } | |
5820 | #endif | |
5821 | ||
7ee3d4e8 JL |
5822 | |
5823 | void __init mem_init_print_info(const char *str) | |
5824 | { | |
5825 | unsigned long physpages, codesize, datasize, rosize, bss_size; | |
5826 | unsigned long init_code_size, init_data_size; | |
5827 | ||
5828 | physpages = get_num_physpages(); | |
5829 | codesize = _etext - _stext; | |
5830 | datasize = _edata - _sdata; | |
5831 | rosize = __end_rodata - __start_rodata; | |
5832 | bss_size = __bss_stop - __bss_start; | |
5833 | init_data_size = __init_end - __init_begin; | |
5834 | init_code_size = _einittext - _sinittext; | |
5835 | ||
5836 | /* | |
5837 | * Detect special cases and adjust section sizes accordingly: | |
5838 | * 1) .init.* may be embedded into .data sections | |
5839 | * 2) .init.text.* may be out of [__init_begin, __init_end], | |
5840 | * please refer to arch/tile/kernel/vmlinux.lds.S. | |
5841 | * 3) .rodata.* may be embedded into .text or .data sections. | |
5842 | */ | |
5843 | #define adj_init_size(start, end, size, pos, adj) \ | |
b8af2941 PK |
5844 | do { \ |
5845 | if (start <= pos && pos < end && size > adj) \ | |
5846 | size -= adj; \ | |
5847 | } while (0) | |
7ee3d4e8 JL |
5848 | |
5849 | adj_init_size(__init_begin, __init_end, init_data_size, | |
5850 | _sinittext, init_code_size); | |
5851 | adj_init_size(_stext, _etext, codesize, _sinittext, init_code_size); | |
5852 | adj_init_size(_sdata, _edata, datasize, __init_begin, init_data_size); | |
5853 | adj_init_size(_stext, _etext, codesize, __start_rodata, rosize); | |
5854 | adj_init_size(_sdata, _edata, datasize, __start_rodata, rosize); | |
5855 | ||
5856 | #undef adj_init_size | |
5857 | ||
f88dfff5 | 5858 | pr_info("Memory: %luK/%luK available " |
7ee3d4e8 | 5859 | "(%luK kernel code, %luK rwdata, %luK rodata, " |
e48322ab | 5860 | "%luK init, %luK bss, %luK reserved, %luK cma-reserved" |
7ee3d4e8 JL |
5861 | #ifdef CONFIG_HIGHMEM |
5862 | ", %luK highmem" | |
5863 | #endif | |
5864 | "%s%s)\n", | |
5865 | nr_free_pages() << (PAGE_SHIFT-10), physpages << (PAGE_SHIFT-10), | |
5866 | codesize >> 10, datasize >> 10, rosize >> 10, | |
5867 | (init_data_size + init_code_size) >> 10, bss_size >> 10, | |
e48322ab PK |
5868 | (physpages - totalram_pages - totalcma_pages) << (PAGE_SHIFT-10), |
5869 | totalcma_pages << (PAGE_SHIFT-10), | |
7ee3d4e8 JL |
5870 | #ifdef CONFIG_HIGHMEM |
5871 | totalhigh_pages << (PAGE_SHIFT-10), | |
5872 | #endif | |
5873 | str ? ", " : "", str ? str : ""); | |
5874 | } | |
5875 | ||
0e0b864e | 5876 | /** |
88ca3b94 RD |
5877 | * set_dma_reserve - set the specified number of pages reserved in the first zone |
5878 | * @new_dma_reserve: The number of pages to mark reserved | |
0e0b864e | 5879 | * |
013110a7 | 5880 | * The per-cpu batchsize and zone watermarks are determined by managed_pages. |
0e0b864e MG |
5881 | * In the DMA zone, a significant percentage may be consumed by kernel image |
5882 | * and other unfreeable allocations which can skew the watermarks badly. This | |
88ca3b94 RD |
5883 | * function may optionally be used to account for unfreeable pages in the |
5884 | * first zone (e.g., ZONE_DMA). The effect will be lower watermarks and | |
5885 | * smaller per-cpu batchsize. | |
0e0b864e MG |
5886 | */ |
5887 | void __init set_dma_reserve(unsigned long new_dma_reserve) | |
5888 | { | |
5889 | dma_reserve = new_dma_reserve; | |
5890 | } | |
5891 | ||
1da177e4 LT |
5892 | void __init free_area_init(unsigned long *zones_size) |
5893 | { | |
9109fb7b | 5894 | free_area_init_node(0, zones_size, |
1da177e4 LT |
5895 | __pa(PAGE_OFFSET) >> PAGE_SHIFT, NULL); |
5896 | } | |
1da177e4 | 5897 | |
1da177e4 LT |
5898 | static int page_alloc_cpu_notify(struct notifier_block *self, |
5899 | unsigned long action, void *hcpu) | |
5900 | { | |
5901 | int cpu = (unsigned long)hcpu; | |
1da177e4 | 5902 | |
8bb78442 | 5903 | if (action == CPU_DEAD || action == CPU_DEAD_FROZEN) { |
f0cb3c76 | 5904 | lru_add_drain_cpu(cpu); |
9f8f2172 CL |
5905 | drain_pages(cpu); |
5906 | ||
5907 | /* | |
5908 | * Spill the event counters of the dead processor | |
5909 | * into the current processors event counters. | |
5910 | * This artificially elevates the count of the current | |
5911 | * processor. | |
5912 | */ | |
f8891e5e | 5913 | vm_events_fold_cpu(cpu); |
9f8f2172 CL |
5914 | |
5915 | /* | |
5916 | * Zero the differential counters of the dead processor | |
5917 | * so that the vm statistics are consistent. | |
5918 | * | |
5919 | * This is only okay since the processor is dead and cannot | |
5920 | * race with what we are doing. | |
5921 | */ | |
2bb921e5 | 5922 | cpu_vm_stats_fold(cpu); |
1da177e4 LT |
5923 | } |
5924 | return NOTIFY_OK; | |
5925 | } | |
1da177e4 LT |
5926 | |
5927 | void __init page_alloc_init(void) | |
5928 | { | |
5929 | hotcpu_notifier(page_alloc_cpu_notify, 0); | |
5930 | } | |
5931 | ||
cb45b0e9 | 5932 | /* |
34b10060 | 5933 | * calculate_totalreserve_pages - called when sysctl_lowmem_reserve_ratio |
cb45b0e9 HA |
5934 | * or min_free_kbytes changes. |
5935 | */ | |
5936 | static void calculate_totalreserve_pages(void) | |
5937 | { | |
5938 | struct pglist_data *pgdat; | |
5939 | unsigned long reserve_pages = 0; | |
2f6726e5 | 5940 | enum zone_type i, j; |
cb45b0e9 HA |
5941 | |
5942 | for_each_online_pgdat(pgdat) { | |
5943 | for (i = 0; i < MAX_NR_ZONES; i++) { | |
5944 | struct zone *zone = pgdat->node_zones + i; | |
3484b2de | 5945 | long max = 0; |
cb45b0e9 HA |
5946 | |
5947 | /* Find valid and maximum lowmem_reserve in the zone */ | |
5948 | for (j = i; j < MAX_NR_ZONES; j++) { | |
5949 | if (zone->lowmem_reserve[j] > max) | |
5950 | max = zone->lowmem_reserve[j]; | |
5951 | } | |
5952 | ||
41858966 MG |
5953 | /* we treat the high watermark as reserved pages. */ |
5954 | max += high_wmark_pages(zone); | |
cb45b0e9 | 5955 | |
b40da049 JL |
5956 | if (max > zone->managed_pages) |
5957 | max = zone->managed_pages; | |
cb45b0e9 | 5958 | reserve_pages += max; |
ab8fabd4 JW |
5959 | /* |
5960 | * Lowmem reserves are not available to | |
5961 | * GFP_HIGHUSER page cache allocations and | |
5962 | * kswapd tries to balance zones to their high | |
5963 | * watermark. As a result, neither should be | |
5964 | * regarded as dirtyable memory, to prevent a | |
5965 | * situation where reclaim has to clean pages | |
5966 | * in order to balance the zones. | |
5967 | */ | |
5968 | zone->dirty_balance_reserve = max; | |
cb45b0e9 HA |
5969 | } |
5970 | } | |
ab8fabd4 | 5971 | dirty_balance_reserve = reserve_pages; |
cb45b0e9 HA |
5972 | totalreserve_pages = reserve_pages; |
5973 | } | |
5974 | ||
1da177e4 LT |
5975 | /* |
5976 | * setup_per_zone_lowmem_reserve - called whenever | |
34b10060 | 5977 | * sysctl_lowmem_reserve_ratio changes. Ensures that each zone |
1da177e4 LT |
5978 | * has a correct pages reserved value, so an adequate number of |
5979 | * pages are left in the zone after a successful __alloc_pages(). | |
5980 | */ | |
5981 | static void setup_per_zone_lowmem_reserve(void) | |
5982 | { | |
5983 | struct pglist_data *pgdat; | |
2f6726e5 | 5984 | enum zone_type j, idx; |
1da177e4 | 5985 | |
ec936fc5 | 5986 | for_each_online_pgdat(pgdat) { |
1da177e4 LT |
5987 | for (j = 0; j < MAX_NR_ZONES; j++) { |
5988 | struct zone *zone = pgdat->node_zones + j; | |
b40da049 | 5989 | unsigned long managed_pages = zone->managed_pages; |
1da177e4 LT |
5990 | |
5991 | zone->lowmem_reserve[j] = 0; | |
5992 | ||
2f6726e5 CL |
5993 | idx = j; |
5994 | while (idx) { | |
1da177e4 LT |
5995 | struct zone *lower_zone; |
5996 | ||
2f6726e5 CL |
5997 | idx--; |
5998 | ||
1da177e4 LT |
5999 | if (sysctl_lowmem_reserve_ratio[idx] < 1) |
6000 | sysctl_lowmem_reserve_ratio[idx] = 1; | |
6001 | ||
6002 | lower_zone = pgdat->node_zones + idx; | |
b40da049 | 6003 | lower_zone->lowmem_reserve[j] = managed_pages / |
1da177e4 | 6004 | sysctl_lowmem_reserve_ratio[idx]; |
b40da049 | 6005 | managed_pages += lower_zone->managed_pages; |
1da177e4 LT |
6006 | } |
6007 | } | |
6008 | } | |
cb45b0e9 HA |
6009 | |
6010 | /* update totalreserve_pages */ | |
6011 | calculate_totalreserve_pages(); | |
1da177e4 LT |
6012 | } |
6013 | ||
cfd3da1e | 6014 | static void __setup_per_zone_wmarks(void) |
1da177e4 LT |
6015 | { |
6016 | unsigned long pages_min = min_free_kbytes >> (PAGE_SHIFT - 10); | |
6017 | unsigned long lowmem_pages = 0; | |
6018 | struct zone *zone; | |
6019 | unsigned long flags; | |
6020 | ||
6021 | /* Calculate total number of !ZONE_HIGHMEM pages */ | |
6022 | for_each_zone(zone) { | |
6023 | if (!is_highmem(zone)) | |
b40da049 | 6024 | lowmem_pages += zone->managed_pages; |
1da177e4 LT |
6025 | } |
6026 | ||
6027 | for_each_zone(zone) { | |
ac924c60 AM |
6028 | u64 tmp; |
6029 | ||
1125b4e3 | 6030 | spin_lock_irqsave(&zone->lock, flags); |
b40da049 | 6031 | tmp = (u64)pages_min * zone->managed_pages; |
ac924c60 | 6032 | do_div(tmp, lowmem_pages); |
1da177e4 LT |
6033 | if (is_highmem(zone)) { |
6034 | /* | |
669ed175 NP |
6035 | * __GFP_HIGH and PF_MEMALLOC allocations usually don't |
6036 | * need highmem pages, so cap pages_min to a small | |
6037 | * value here. | |
6038 | * | |
41858966 | 6039 | * The WMARK_HIGH-WMARK_LOW and (WMARK_LOW-WMARK_MIN) |
42ff2703 | 6040 | * deltas control asynch page reclaim, and so should |
669ed175 | 6041 | * not be capped for highmem. |
1da177e4 | 6042 | */ |
90ae8d67 | 6043 | unsigned long min_pages; |
1da177e4 | 6044 | |
b40da049 | 6045 | min_pages = zone->managed_pages / 1024; |
90ae8d67 | 6046 | min_pages = clamp(min_pages, SWAP_CLUSTER_MAX, 128UL); |
41858966 | 6047 | zone->watermark[WMARK_MIN] = min_pages; |
1da177e4 | 6048 | } else { |
669ed175 NP |
6049 | /* |
6050 | * If it's a lowmem zone, reserve a number of pages | |
1da177e4 LT |
6051 | * proportionate to the zone's size. |
6052 | */ | |
41858966 | 6053 | zone->watermark[WMARK_MIN] = tmp; |
1da177e4 LT |
6054 | } |
6055 | ||
41858966 MG |
6056 | zone->watermark[WMARK_LOW] = min_wmark_pages(zone) + (tmp >> 2); |
6057 | zone->watermark[WMARK_HIGH] = min_wmark_pages(zone) + (tmp >> 1); | |
49f223a9 | 6058 | |
81c0a2bb | 6059 | __mod_zone_page_state(zone, NR_ALLOC_BATCH, |
abe5f972 JW |
6060 | high_wmark_pages(zone) - low_wmark_pages(zone) - |
6061 | atomic_long_read(&zone->vm_stat[NR_ALLOC_BATCH])); | |
81c0a2bb | 6062 | |
1125b4e3 | 6063 | spin_unlock_irqrestore(&zone->lock, flags); |
1da177e4 | 6064 | } |
cb45b0e9 HA |
6065 | |
6066 | /* update totalreserve_pages */ | |
6067 | calculate_totalreserve_pages(); | |
1da177e4 LT |
6068 | } |
6069 | ||
cfd3da1e MG |
6070 | /** |
6071 | * setup_per_zone_wmarks - called when min_free_kbytes changes | |
6072 | * or when memory is hot-{added|removed} | |
6073 | * | |
6074 | * Ensures that the watermark[min,low,high] values for each zone are set | |
6075 | * correctly with respect to min_free_kbytes. | |
6076 | */ | |
6077 | void setup_per_zone_wmarks(void) | |
6078 | { | |
6079 | mutex_lock(&zonelists_mutex); | |
6080 | __setup_per_zone_wmarks(); | |
6081 | mutex_unlock(&zonelists_mutex); | |
6082 | } | |
6083 | ||
55a4462a | 6084 | /* |
556adecb RR |
6085 | * The inactive anon list should be small enough that the VM never has to |
6086 | * do too much work, but large enough that each inactive page has a chance | |
6087 | * to be referenced again before it is swapped out. | |
6088 | * | |
6089 | * The inactive_anon ratio is the target ratio of ACTIVE_ANON to | |
6090 | * INACTIVE_ANON pages on this zone's LRU, maintained by the | |
6091 | * pageout code. A zone->inactive_ratio of 3 means 3:1 or 25% of | |
6092 | * the anonymous pages are kept on the inactive list. | |
6093 | * | |
6094 | * total target max | |
6095 | * memory ratio inactive anon | |
6096 | * ------------------------------------- | |
6097 | * 10MB 1 5MB | |
6098 | * 100MB 1 50MB | |
6099 | * 1GB 3 250MB | |
6100 | * 10GB 10 0.9GB | |
6101 | * 100GB 31 3GB | |
6102 | * 1TB 101 10GB | |
6103 | * 10TB 320 32GB | |
6104 | */ | |
1b79acc9 | 6105 | static void __meminit calculate_zone_inactive_ratio(struct zone *zone) |
556adecb | 6106 | { |
96cb4df5 | 6107 | unsigned int gb, ratio; |
556adecb | 6108 | |
96cb4df5 | 6109 | /* Zone size in gigabytes */ |
b40da049 | 6110 | gb = zone->managed_pages >> (30 - PAGE_SHIFT); |
96cb4df5 | 6111 | if (gb) |
556adecb | 6112 | ratio = int_sqrt(10 * gb); |
96cb4df5 MK |
6113 | else |
6114 | ratio = 1; | |
556adecb | 6115 | |
96cb4df5 MK |
6116 | zone->inactive_ratio = ratio; |
6117 | } | |
556adecb | 6118 | |
839a4fcc | 6119 | static void __meminit setup_per_zone_inactive_ratio(void) |
96cb4df5 MK |
6120 | { |
6121 | struct zone *zone; | |
6122 | ||
6123 | for_each_zone(zone) | |
6124 | calculate_zone_inactive_ratio(zone); | |
556adecb RR |
6125 | } |
6126 | ||
1da177e4 LT |
6127 | /* |
6128 | * Initialise min_free_kbytes. | |
6129 | * | |
6130 | * For small machines we want it small (128k min). For large machines | |
6131 | * we want it large (64MB max). But it is not linear, because network | |
6132 | * bandwidth does not increase linearly with machine size. We use | |
6133 | * | |
b8af2941 | 6134 | * min_free_kbytes = 4 * sqrt(lowmem_kbytes), for better accuracy: |
1da177e4 LT |
6135 | * min_free_kbytes = sqrt(lowmem_kbytes * 16) |
6136 | * | |
6137 | * which yields | |
6138 | * | |
6139 | * 16MB: 512k | |
6140 | * 32MB: 724k | |
6141 | * 64MB: 1024k | |
6142 | * 128MB: 1448k | |
6143 | * 256MB: 2048k | |
6144 | * 512MB: 2896k | |
6145 | * 1024MB: 4096k | |
6146 | * 2048MB: 5792k | |
6147 | * 4096MB: 8192k | |
6148 | * 8192MB: 11584k | |
6149 | * 16384MB: 16384k | |
6150 | */ | |
1b79acc9 | 6151 | int __meminit init_per_zone_wmark_min(void) |
1da177e4 LT |
6152 | { |
6153 | unsigned long lowmem_kbytes; | |
5f12733e | 6154 | int new_min_free_kbytes; |
1da177e4 LT |
6155 | |
6156 | lowmem_kbytes = nr_free_buffer_pages() * (PAGE_SIZE >> 10); | |
5f12733e MH |
6157 | new_min_free_kbytes = int_sqrt(lowmem_kbytes * 16); |
6158 | ||
6159 | if (new_min_free_kbytes > user_min_free_kbytes) { | |
6160 | min_free_kbytes = new_min_free_kbytes; | |
6161 | if (min_free_kbytes < 128) | |
6162 | min_free_kbytes = 128; | |
6163 | if (min_free_kbytes > 65536) | |
6164 | min_free_kbytes = 65536; | |
6165 | } else { | |
6166 | pr_warn("min_free_kbytes is not updated to %d because user defined value %d is preferred\n", | |
6167 | new_min_free_kbytes, user_min_free_kbytes); | |
6168 | } | |
bc75d33f | 6169 | setup_per_zone_wmarks(); |
a6cccdc3 | 6170 | refresh_zone_stat_thresholds(); |
1da177e4 | 6171 | setup_per_zone_lowmem_reserve(); |
556adecb | 6172 | setup_per_zone_inactive_ratio(); |
1da177e4 LT |
6173 | return 0; |
6174 | } | |
bc75d33f | 6175 | module_init(init_per_zone_wmark_min) |
1da177e4 LT |
6176 | |
6177 | /* | |
b8af2941 | 6178 | * min_free_kbytes_sysctl_handler - just a wrapper around proc_dointvec() so |
1da177e4 LT |
6179 | * that we can call two helper functions whenever min_free_kbytes |
6180 | * changes. | |
6181 | */ | |
cccad5b9 | 6182 | int min_free_kbytes_sysctl_handler(struct ctl_table *table, int write, |
8d65af78 | 6183 | void __user *buffer, size_t *length, loff_t *ppos) |
1da177e4 | 6184 | { |
da8c757b HP |
6185 | int rc; |
6186 | ||
6187 | rc = proc_dointvec_minmax(table, write, buffer, length, ppos); | |
6188 | if (rc) | |
6189 | return rc; | |
6190 | ||
5f12733e MH |
6191 | if (write) { |
6192 | user_min_free_kbytes = min_free_kbytes; | |
bc75d33f | 6193 | setup_per_zone_wmarks(); |
5f12733e | 6194 | } |
1da177e4 LT |
6195 | return 0; |
6196 | } | |
6197 | ||
9614634f | 6198 | #ifdef CONFIG_NUMA |
cccad5b9 | 6199 | int sysctl_min_unmapped_ratio_sysctl_handler(struct ctl_table *table, int write, |
8d65af78 | 6200 | void __user *buffer, size_t *length, loff_t *ppos) |
9614634f CL |
6201 | { |
6202 | struct zone *zone; | |
6203 | int rc; | |
6204 | ||
8d65af78 | 6205 | rc = proc_dointvec_minmax(table, write, buffer, length, ppos); |
9614634f CL |
6206 | if (rc) |
6207 | return rc; | |
6208 | ||
6209 | for_each_zone(zone) | |
b40da049 | 6210 | zone->min_unmapped_pages = (zone->managed_pages * |
9614634f CL |
6211 | sysctl_min_unmapped_ratio) / 100; |
6212 | return 0; | |
6213 | } | |
0ff38490 | 6214 | |
cccad5b9 | 6215 | int sysctl_min_slab_ratio_sysctl_handler(struct ctl_table *table, int write, |
8d65af78 | 6216 | void __user *buffer, size_t *length, loff_t *ppos) |
0ff38490 CL |
6217 | { |
6218 | struct zone *zone; | |
6219 | int rc; | |
6220 | ||
8d65af78 | 6221 | rc = proc_dointvec_minmax(table, write, buffer, length, ppos); |
0ff38490 CL |
6222 | if (rc) |
6223 | return rc; | |
6224 | ||
6225 | for_each_zone(zone) | |
b40da049 | 6226 | zone->min_slab_pages = (zone->managed_pages * |
0ff38490 CL |
6227 | sysctl_min_slab_ratio) / 100; |
6228 | return 0; | |
6229 | } | |
9614634f CL |
6230 | #endif |
6231 | ||
1da177e4 LT |
6232 | /* |
6233 | * lowmem_reserve_ratio_sysctl_handler - just a wrapper around | |
6234 | * proc_dointvec() so that we can call setup_per_zone_lowmem_reserve() | |
6235 | * whenever sysctl_lowmem_reserve_ratio changes. | |
6236 | * | |
6237 | * The reserve ratio obviously has absolutely no relation with the | |
41858966 | 6238 | * minimum watermarks. The lowmem reserve ratio can only make sense |
1da177e4 LT |
6239 | * if in function of the boot time zone sizes. |
6240 | */ | |
cccad5b9 | 6241 | int lowmem_reserve_ratio_sysctl_handler(struct ctl_table *table, int write, |
8d65af78 | 6242 | void __user *buffer, size_t *length, loff_t *ppos) |
1da177e4 | 6243 | { |
8d65af78 | 6244 | proc_dointvec_minmax(table, write, buffer, length, ppos); |
1da177e4 LT |
6245 | setup_per_zone_lowmem_reserve(); |
6246 | return 0; | |
6247 | } | |
6248 | ||
8ad4b1fb RS |
6249 | /* |
6250 | * percpu_pagelist_fraction - changes the pcp->high for each zone on each | |
b8af2941 PK |
6251 | * cpu. It is the fraction of total pages in each zone that a hot per cpu |
6252 | * pagelist can have before it gets flushed back to buddy allocator. | |
8ad4b1fb | 6253 | */ |
cccad5b9 | 6254 | int percpu_pagelist_fraction_sysctl_handler(struct ctl_table *table, int write, |
8d65af78 | 6255 | void __user *buffer, size_t *length, loff_t *ppos) |
8ad4b1fb RS |
6256 | { |
6257 | struct zone *zone; | |
7cd2b0a3 | 6258 | int old_percpu_pagelist_fraction; |
8ad4b1fb RS |
6259 | int ret; |
6260 | ||
7cd2b0a3 DR |
6261 | mutex_lock(&pcp_batch_high_lock); |
6262 | old_percpu_pagelist_fraction = percpu_pagelist_fraction; | |
6263 | ||
8d65af78 | 6264 | ret = proc_dointvec_minmax(table, write, buffer, length, ppos); |
7cd2b0a3 DR |
6265 | if (!write || ret < 0) |
6266 | goto out; | |
6267 | ||
6268 | /* Sanity checking to avoid pcp imbalance */ | |
6269 | if (percpu_pagelist_fraction && | |
6270 | percpu_pagelist_fraction < MIN_PERCPU_PAGELIST_FRACTION) { | |
6271 | percpu_pagelist_fraction = old_percpu_pagelist_fraction; | |
6272 | ret = -EINVAL; | |
6273 | goto out; | |
6274 | } | |
6275 | ||
6276 | /* No change? */ | |
6277 | if (percpu_pagelist_fraction == old_percpu_pagelist_fraction) | |
6278 | goto out; | |
c8e251fa | 6279 | |
364df0eb | 6280 | for_each_populated_zone(zone) { |
7cd2b0a3 DR |
6281 | unsigned int cpu; |
6282 | ||
22a7f12b | 6283 | for_each_possible_cpu(cpu) |
7cd2b0a3 DR |
6284 | pageset_set_high_and_batch(zone, |
6285 | per_cpu_ptr(zone->pageset, cpu)); | |
8ad4b1fb | 6286 | } |
7cd2b0a3 | 6287 | out: |
c8e251fa | 6288 | mutex_unlock(&pcp_batch_high_lock); |
7cd2b0a3 | 6289 | return ret; |
8ad4b1fb RS |
6290 | } |
6291 | ||
a9919c79 | 6292 | #ifdef CONFIG_NUMA |
f034b5d4 | 6293 | int hashdist = HASHDIST_DEFAULT; |
1da177e4 | 6294 | |
1da177e4 LT |
6295 | static int __init set_hashdist(char *str) |
6296 | { | |
6297 | if (!str) | |
6298 | return 0; | |
6299 | hashdist = simple_strtoul(str, &str, 0); | |
6300 | return 1; | |
6301 | } | |
6302 | __setup("hashdist=", set_hashdist); | |
6303 | #endif | |
6304 | ||
6305 | /* | |
6306 | * allocate a large system hash table from bootmem | |
6307 | * - it is assumed that the hash table must contain an exact power-of-2 | |
6308 | * quantity of entries | |
6309 | * - limit is the number of hash buckets, not the total allocation size | |
6310 | */ | |
6311 | void *__init alloc_large_system_hash(const char *tablename, | |
6312 | unsigned long bucketsize, | |
6313 | unsigned long numentries, | |
6314 | int scale, | |
6315 | int flags, | |
6316 | unsigned int *_hash_shift, | |
6317 | unsigned int *_hash_mask, | |
31fe62b9 TB |
6318 | unsigned long low_limit, |
6319 | unsigned long high_limit) | |
1da177e4 | 6320 | { |
31fe62b9 | 6321 | unsigned long long max = high_limit; |
1da177e4 LT |
6322 | unsigned long log2qty, size; |
6323 | void *table = NULL; | |
6324 | ||
6325 | /* allow the kernel cmdline to have a say */ | |
6326 | if (!numentries) { | |
6327 | /* round applicable memory size up to nearest megabyte */ | |
04903664 | 6328 | numentries = nr_kernel_pages; |
a7e83318 JZ |
6329 | |
6330 | /* It isn't necessary when PAGE_SIZE >= 1MB */ | |
6331 | if (PAGE_SHIFT < 20) | |
6332 | numentries = round_up(numentries, (1<<20)/PAGE_SIZE); | |
1da177e4 LT |
6333 | |
6334 | /* limit to 1 bucket per 2^scale bytes of low memory */ | |
6335 | if (scale > PAGE_SHIFT) | |
6336 | numentries >>= (scale - PAGE_SHIFT); | |
6337 | else | |
6338 | numentries <<= (PAGE_SHIFT - scale); | |
9ab37b8f PM |
6339 | |
6340 | /* Make sure we've got at least a 0-order allocation.. */ | |
2c85f51d JB |
6341 | if (unlikely(flags & HASH_SMALL)) { |
6342 | /* Makes no sense without HASH_EARLY */ | |
6343 | WARN_ON(!(flags & HASH_EARLY)); | |
6344 | if (!(numentries >> *_hash_shift)) { | |
6345 | numentries = 1UL << *_hash_shift; | |
6346 | BUG_ON(!numentries); | |
6347 | } | |
6348 | } else if (unlikely((numentries * bucketsize) < PAGE_SIZE)) | |
9ab37b8f | 6349 | numentries = PAGE_SIZE / bucketsize; |
1da177e4 | 6350 | } |
6e692ed3 | 6351 | numentries = roundup_pow_of_two(numentries); |
1da177e4 LT |
6352 | |
6353 | /* limit allocation size to 1/16 total memory by default */ | |
6354 | if (max == 0) { | |
6355 | max = ((unsigned long long)nr_all_pages << PAGE_SHIFT) >> 4; | |
6356 | do_div(max, bucketsize); | |
6357 | } | |
074b8517 | 6358 | max = min(max, 0x80000000ULL); |
1da177e4 | 6359 | |
31fe62b9 TB |
6360 | if (numentries < low_limit) |
6361 | numentries = low_limit; | |
1da177e4 LT |
6362 | if (numentries > max) |
6363 | numentries = max; | |
6364 | ||
f0d1b0b3 | 6365 | log2qty = ilog2(numentries); |
1da177e4 LT |
6366 | |
6367 | do { | |
6368 | size = bucketsize << log2qty; | |
6369 | if (flags & HASH_EARLY) | |
6782832e | 6370 | table = memblock_virt_alloc_nopanic(size, 0); |
1da177e4 LT |
6371 | else if (hashdist) |
6372 | table = __vmalloc(size, GFP_ATOMIC, PAGE_KERNEL); | |
6373 | else { | |
1037b83b ED |
6374 | /* |
6375 | * If bucketsize is not a power-of-two, we may free | |
a1dd268c MG |
6376 | * some pages at the end of hash table which |
6377 | * alloc_pages_exact() automatically does | |
1037b83b | 6378 | */ |
264ef8a9 | 6379 | if (get_order(size) < MAX_ORDER) { |
a1dd268c | 6380 | table = alloc_pages_exact(size, GFP_ATOMIC); |
264ef8a9 CM |
6381 | kmemleak_alloc(table, size, 1, GFP_ATOMIC); |
6382 | } | |
1da177e4 LT |
6383 | } |
6384 | } while (!table && size > PAGE_SIZE && --log2qty); | |
6385 | ||
6386 | if (!table) | |
6387 | panic("Failed to allocate %s hash table\n", tablename); | |
6388 | ||
f241e660 | 6389 | printk(KERN_INFO "%s hash table entries: %ld (order: %d, %lu bytes)\n", |
1da177e4 | 6390 | tablename, |
f241e660 | 6391 | (1UL << log2qty), |
f0d1b0b3 | 6392 | ilog2(size) - PAGE_SHIFT, |
1da177e4 LT |
6393 | size); |
6394 | ||
6395 | if (_hash_shift) | |
6396 | *_hash_shift = log2qty; | |
6397 | if (_hash_mask) | |
6398 | *_hash_mask = (1 << log2qty) - 1; | |
6399 | ||
6400 | return table; | |
6401 | } | |
a117e66e | 6402 | |
835c134e MG |
6403 | /* Return a pointer to the bitmap storing bits affecting a block of pages */ |
6404 | static inline unsigned long *get_pageblock_bitmap(struct zone *zone, | |
6405 | unsigned long pfn) | |
6406 | { | |
6407 | #ifdef CONFIG_SPARSEMEM | |
6408 | return __pfn_to_section(pfn)->pageblock_flags; | |
6409 | #else | |
6410 | return zone->pageblock_flags; | |
6411 | #endif /* CONFIG_SPARSEMEM */ | |
6412 | } | |
6413 | ||
6414 | static inline int pfn_to_bitidx(struct zone *zone, unsigned long pfn) | |
6415 | { | |
6416 | #ifdef CONFIG_SPARSEMEM | |
6417 | pfn &= (PAGES_PER_SECTION-1); | |
d9c23400 | 6418 | return (pfn >> pageblock_order) * NR_PAGEBLOCK_BITS; |
835c134e | 6419 | #else |
c060f943 | 6420 | pfn = pfn - round_down(zone->zone_start_pfn, pageblock_nr_pages); |
d9c23400 | 6421 | return (pfn >> pageblock_order) * NR_PAGEBLOCK_BITS; |
835c134e MG |
6422 | #endif /* CONFIG_SPARSEMEM */ |
6423 | } | |
6424 | ||
6425 | /** | |
1aab4d77 | 6426 | * get_pfnblock_flags_mask - Return the requested group of flags for the pageblock_nr_pages block of pages |
835c134e | 6427 | * @page: The page within the block of interest |
1aab4d77 RD |
6428 | * @pfn: The target page frame number |
6429 | * @end_bitidx: The last bit of interest to retrieve | |
6430 | * @mask: mask of bits that the caller is interested in | |
6431 | * | |
6432 | * Return: pageblock_bits flags | |
835c134e | 6433 | */ |
dc4b0caf | 6434 | unsigned long get_pfnblock_flags_mask(struct page *page, unsigned long pfn, |
e58469ba MG |
6435 | unsigned long end_bitidx, |
6436 | unsigned long mask) | |
835c134e MG |
6437 | { |
6438 | struct zone *zone; | |
6439 | unsigned long *bitmap; | |
dc4b0caf | 6440 | unsigned long bitidx, word_bitidx; |
e58469ba | 6441 | unsigned long word; |
835c134e MG |
6442 | |
6443 | zone = page_zone(page); | |
835c134e MG |
6444 | bitmap = get_pageblock_bitmap(zone, pfn); |
6445 | bitidx = pfn_to_bitidx(zone, pfn); | |
e58469ba MG |
6446 | word_bitidx = bitidx / BITS_PER_LONG; |
6447 | bitidx &= (BITS_PER_LONG-1); | |
835c134e | 6448 | |
e58469ba MG |
6449 | word = bitmap[word_bitidx]; |
6450 | bitidx += end_bitidx; | |
6451 | return (word >> (BITS_PER_LONG - bitidx - 1)) & mask; | |
835c134e MG |
6452 | } |
6453 | ||
6454 | /** | |
dc4b0caf | 6455 | * set_pfnblock_flags_mask - Set the requested group of flags for a pageblock_nr_pages block of pages |
835c134e | 6456 | * @page: The page within the block of interest |
835c134e | 6457 | * @flags: The flags to set |
1aab4d77 RD |
6458 | * @pfn: The target page frame number |
6459 | * @end_bitidx: The last bit of interest | |
6460 | * @mask: mask of bits that the caller is interested in | |
835c134e | 6461 | */ |
dc4b0caf MG |
6462 | void set_pfnblock_flags_mask(struct page *page, unsigned long flags, |
6463 | unsigned long pfn, | |
e58469ba MG |
6464 | unsigned long end_bitidx, |
6465 | unsigned long mask) | |
835c134e MG |
6466 | { |
6467 | struct zone *zone; | |
6468 | unsigned long *bitmap; | |
dc4b0caf | 6469 | unsigned long bitidx, word_bitidx; |
e58469ba MG |
6470 | unsigned long old_word, word; |
6471 | ||
6472 | BUILD_BUG_ON(NR_PAGEBLOCK_BITS != 4); | |
835c134e MG |
6473 | |
6474 | zone = page_zone(page); | |
835c134e MG |
6475 | bitmap = get_pageblock_bitmap(zone, pfn); |
6476 | bitidx = pfn_to_bitidx(zone, pfn); | |
e58469ba MG |
6477 | word_bitidx = bitidx / BITS_PER_LONG; |
6478 | bitidx &= (BITS_PER_LONG-1); | |
6479 | ||
309381fe | 6480 | VM_BUG_ON_PAGE(!zone_spans_pfn(zone, pfn), page); |
835c134e | 6481 | |
e58469ba MG |
6482 | bitidx += end_bitidx; |
6483 | mask <<= (BITS_PER_LONG - bitidx - 1); | |
6484 | flags <<= (BITS_PER_LONG - bitidx - 1); | |
6485 | ||
4db0c3c2 | 6486 | word = READ_ONCE(bitmap[word_bitidx]); |
e58469ba MG |
6487 | for (;;) { |
6488 | old_word = cmpxchg(&bitmap[word_bitidx], word, (word & ~mask) | flags); | |
6489 | if (word == old_word) | |
6490 | break; | |
6491 | word = old_word; | |
6492 | } | |
835c134e | 6493 | } |
a5d76b54 KH |
6494 | |
6495 | /* | |
80934513 MK |
6496 | * This function checks whether pageblock includes unmovable pages or not. |
6497 | * If @count is not zero, it is okay to include less @count unmovable pages | |
6498 | * | |
b8af2941 | 6499 | * PageLRU check without isolation or lru_lock could race so that |
80934513 MK |
6500 | * MIGRATE_MOVABLE block might include unmovable pages. It means you can't |
6501 | * expect this function should be exact. | |
a5d76b54 | 6502 | */ |
b023f468 WC |
6503 | bool has_unmovable_pages(struct zone *zone, struct page *page, int count, |
6504 | bool skip_hwpoisoned_pages) | |
49ac8255 KH |
6505 | { |
6506 | unsigned long pfn, iter, found; | |
47118af0 MN |
6507 | int mt; |
6508 | ||
49ac8255 KH |
6509 | /* |
6510 | * For avoiding noise data, lru_add_drain_all() should be called | |
80934513 | 6511 | * If ZONE_MOVABLE, the zone never contains unmovable pages |
49ac8255 KH |
6512 | */ |
6513 | if (zone_idx(zone) == ZONE_MOVABLE) | |
80934513 | 6514 | return false; |
47118af0 MN |
6515 | mt = get_pageblock_migratetype(page); |
6516 | if (mt == MIGRATE_MOVABLE || is_migrate_cma(mt)) | |
80934513 | 6517 | return false; |
49ac8255 KH |
6518 | |
6519 | pfn = page_to_pfn(page); | |
6520 | for (found = 0, iter = 0; iter < pageblock_nr_pages; iter++) { | |
6521 | unsigned long check = pfn + iter; | |
6522 | ||
29723fcc | 6523 | if (!pfn_valid_within(check)) |
49ac8255 | 6524 | continue; |
29723fcc | 6525 | |
49ac8255 | 6526 | page = pfn_to_page(check); |
c8721bbb NH |
6527 | |
6528 | /* | |
6529 | * Hugepages are not in LRU lists, but they're movable. | |
6530 | * We need not scan over tail pages bacause we don't | |
6531 | * handle each tail page individually in migration. | |
6532 | */ | |
6533 | if (PageHuge(page)) { | |
6534 | iter = round_up(iter + 1, 1<<compound_order(page)) - 1; | |
6535 | continue; | |
6536 | } | |
6537 | ||
97d255c8 MK |
6538 | /* |
6539 | * We can't use page_count without pin a page | |
6540 | * because another CPU can free compound page. | |
6541 | * This check already skips compound tails of THP | |
6542 | * because their page->_count is zero at all time. | |
6543 | */ | |
6544 | if (!atomic_read(&page->_count)) { | |
49ac8255 KH |
6545 | if (PageBuddy(page)) |
6546 | iter += (1 << page_order(page)) - 1; | |
6547 | continue; | |
6548 | } | |
97d255c8 | 6549 | |
b023f468 WC |
6550 | /* |
6551 | * The HWPoisoned page may be not in buddy system, and | |
6552 | * page_count() is not 0. | |
6553 | */ | |
6554 | if (skip_hwpoisoned_pages && PageHWPoison(page)) | |
6555 | continue; | |
6556 | ||
49ac8255 KH |
6557 | if (!PageLRU(page)) |
6558 | found++; | |
6559 | /* | |
6b4f7799 JW |
6560 | * If there are RECLAIMABLE pages, we need to check |
6561 | * it. But now, memory offline itself doesn't call | |
6562 | * shrink_node_slabs() and it still to be fixed. | |
49ac8255 KH |
6563 | */ |
6564 | /* | |
6565 | * If the page is not RAM, page_count()should be 0. | |
6566 | * we don't need more check. This is an _used_ not-movable page. | |
6567 | * | |
6568 | * The problematic thing here is PG_reserved pages. PG_reserved | |
6569 | * is set to both of a memory hole page and a _used_ kernel | |
6570 | * page at boot. | |
6571 | */ | |
6572 | if (found > count) | |
80934513 | 6573 | return true; |
49ac8255 | 6574 | } |
80934513 | 6575 | return false; |
49ac8255 KH |
6576 | } |
6577 | ||
6578 | bool is_pageblock_removable_nolock(struct page *page) | |
6579 | { | |
656a0706 MH |
6580 | struct zone *zone; |
6581 | unsigned long pfn; | |
687875fb MH |
6582 | |
6583 | /* | |
6584 | * We have to be careful here because we are iterating over memory | |
6585 | * sections which are not zone aware so we might end up outside of | |
6586 | * the zone but still within the section. | |
656a0706 MH |
6587 | * We have to take care about the node as well. If the node is offline |
6588 | * its NODE_DATA will be NULL - see page_zone. | |
687875fb | 6589 | */ |
656a0706 MH |
6590 | if (!node_online(page_to_nid(page))) |
6591 | return false; | |
6592 | ||
6593 | zone = page_zone(page); | |
6594 | pfn = page_to_pfn(page); | |
108bcc96 | 6595 | if (!zone_spans_pfn(zone, pfn)) |
687875fb MH |
6596 | return false; |
6597 | ||
b023f468 | 6598 | return !has_unmovable_pages(zone, page, 0, true); |
a5d76b54 | 6599 | } |
0c0e6195 | 6600 | |
041d3a8c MN |
6601 | #ifdef CONFIG_CMA |
6602 | ||
6603 | static unsigned long pfn_max_align_down(unsigned long pfn) | |
6604 | { | |
6605 | return pfn & ~(max_t(unsigned long, MAX_ORDER_NR_PAGES, | |
6606 | pageblock_nr_pages) - 1); | |
6607 | } | |
6608 | ||
6609 | static unsigned long pfn_max_align_up(unsigned long pfn) | |
6610 | { | |
6611 | return ALIGN(pfn, max_t(unsigned long, MAX_ORDER_NR_PAGES, | |
6612 | pageblock_nr_pages)); | |
6613 | } | |
6614 | ||
041d3a8c | 6615 | /* [start, end) must belong to a single zone. */ |
bb13ffeb MG |
6616 | static int __alloc_contig_migrate_range(struct compact_control *cc, |
6617 | unsigned long start, unsigned long end) | |
041d3a8c MN |
6618 | { |
6619 | /* This function is based on compact_zone() from compaction.c. */ | |
beb51eaa | 6620 | unsigned long nr_reclaimed; |
041d3a8c MN |
6621 | unsigned long pfn = start; |
6622 | unsigned int tries = 0; | |
6623 | int ret = 0; | |
6624 | ||
be49a6e1 | 6625 | migrate_prep(); |
041d3a8c | 6626 | |
bb13ffeb | 6627 | while (pfn < end || !list_empty(&cc->migratepages)) { |
041d3a8c MN |
6628 | if (fatal_signal_pending(current)) { |
6629 | ret = -EINTR; | |
6630 | break; | |
6631 | } | |
6632 | ||
bb13ffeb MG |
6633 | if (list_empty(&cc->migratepages)) { |
6634 | cc->nr_migratepages = 0; | |
edc2ca61 | 6635 | pfn = isolate_migratepages_range(cc, pfn, end); |
041d3a8c MN |
6636 | if (!pfn) { |
6637 | ret = -EINTR; | |
6638 | break; | |
6639 | } | |
6640 | tries = 0; | |
6641 | } else if (++tries == 5) { | |
6642 | ret = ret < 0 ? ret : -EBUSY; | |
6643 | break; | |
6644 | } | |
6645 | ||
beb51eaa MK |
6646 | nr_reclaimed = reclaim_clean_pages_from_list(cc->zone, |
6647 | &cc->migratepages); | |
6648 | cc->nr_migratepages -= nr_reclaimed; | |
02c6de8d | 6649 | |
9c620e2b | 6650 | ret = migrate_pages(&cc->migratepages, alloc_migrate_target, |
e0b9daeb | 6651 | NULL, 0, cc->mode, MR_CMA); |
041d3a8c | 6652 | } |
2a6f5124 SP |
6653 | if (ret < 0) { |
6654 | putback_movable_pages(&cc->migratepages); | |
6655 | return ret; | |
6656 | } | |
6657 | return 0; | |
041d3a8c MN |
6658 | } |
6659 | ||
6660 | /** | |
6661 | * alloc_contig_range() -- tries to allocate given range of pages | |
6662 | * @start: start PFN to allocate | |
6663 | * @end: one-past-the-last PFN to allocate | |
0815f3d8 MN |
6664 | * @migratetype: migratetype of the underlaying pageblocks (either |
6665 | * #MIGRATE_MOVABLE or #MIGRATE_CMA). All pageblocks | |
6666 | * in range must have the same migratetype and it must | |
6667 | * be either of the two. | |
041d3a8c MN |
6668 | * |
6669 | * The PFN range does not have to be pageblock or MAX_ORDER_NR_PAGES | |
6670 | * aligned, however it's the caller's responsibility to guarantee that | |
6671 | * we are the only thread that changes migrate type of pageblocks the | |
6672 | * pages fall in. | |
6673 | * | |
6674 | * The PFN range must belong to a single zone. | |
6675 | * | |
6676 | * Returns zero on success or negative error code. On success all | |
6677 | * pages which PFN is in [start, end) are allocated for the caller and | |
6678 | * need to be freed with free_contig_range(). | |
6679 | */ | |
0815f3d8 MN |
6680 | int alloc_contig_range(unsigned long start, unsigned long end, |
6681 | unsigned migratetype) | |
041d3a8c | 6682 | { |
041d3a8c | 6683 | unsigned long outer_start, outer_end; |
d00181b9 KS |
6684 | unsigned int order; |
6685 | int ret = 0; | |
041d3a8c | 6686 | |
bb13ffeb MG |
6687 | struct compact_control cc = { |
6688 | .nr_migratepages = 0, | |
6689 | .order = -1, | |
6690 | .zone = page_zone(pfn_to_page(start)), | |
e0b9daeb | 6691 | .mode = MIGRATE_SYNC, |
bb13ffeb MG |
6692 | .ignore_skip_hint = true, |
6693 | }; | |
6694 | INIT_LIST_HEAD(&cc.migratepages); | |
6695 | ||
041d3a8c MN |
6696 | /* |
6697 | * What we do here is we mark all pageblocks in range as | |
6698 | * MIGRATE_ISOLATE. Because pageblock and max order pages may | |
6699 | * have different sizes, and due to the way page allocator | |
6700 | * work, we align the range to biggest of the two pages so | |
6701 | * that page allocator won't try to merge buddies from | |
6702 | * different pageblocks and change MIGRATE_ISOLATE to some | |
6703 | * other migration type. | |
6704 | * | |
6705 | * Once the pageblocks are marked as MIGRATE_ISOLATE, we | |
6706 | * migrate the pages from an unaligned range (ie. pages that | |
6707 | * we are interested in). This will put all the pages in | |
6708 | * range back to page allocator as MIGRATE_ISOLATE. | |
6709 | * | |
6710 | * When this is done, we take the pages in range from page | |
6711 | * allocator removing them from the buddy system. This way | |
6712 | * page allocator will never consider using them. | |
6713 | * | |
6714 | * This lets us mark the pageblocks back as | |
6715 | * MIGRATE_CMA/MIGRATE_MOVABLE so that free pages in the | |
6716 | * aligned range but not in the unaligned, original range are | |
6717 | * put back to page allocator so that buddy can use them. | |
6718 | */ | |
6719 | ||
6720 | ret = start_isolate_page_range(pfn_max_align_down(start), | |
b023f468 WC |
6721 | pfn_max_align_up(end), migratetype, |
6722 | false); | |
041d3a8c | 6723 | if (ret) |
86a595f9 | 6724 | return ret; |
041d3a8c | 6725 | |
bb13ffeb | 6726 | ret = __alloc_contig_migrate_range(&cc, start, end); |
041d3a8c MN |
6727 | if (ret) |
6728 | goto done; | |
6729 | ||
6730 | /* | |
6731 | * Pages from [start, end) are within a MAX_ORDER_NR_PAGES | |
6732 | * aligned blocks that are marked as MIGRATE_ISOLATE. What's | |
6733 | * more, all pages in [start, end) are free in page allocator. | |
6734 | * What we are going to do is to allocate all pages from | |
6735 | * [start, end) (that is remove them from page allocator). | |
6736 | * | |
6737 | * The only problem is that pages at the beginning and at the | |
6738 | * end of interesting range may be not aligned with pages that | |
6739 | * page allocator holds, ie. they can be part of higher order | |
6740 | * pages. Because of this, we reserve the bigger range and | |
6741 | * once this is done free the pages we are not interested in. | |
6742 | * | |
6743 | * We don't have to hold zone->lock here because the pages are | |
6744 | * isolated thus they won't get removed from buddy. | |
6745 | */ | |
6746 | ||
6747 | lru_add_drain_all(); | |
510f5507 | 6748 | drain_all_pages(cc.zone); |
041d3a8c MN |
6749 | |
6750 | order = 0; | |
6751 | outer_start = start; | |
6752 | while (!PageBuddy(pfn_to_page(outer_start))) { | |
6753 | if (++order >= MAX_ORDER) { | |
6754 | ret = -EBUSY; | |
6755 | goto done; | |
6756 | } | |
6757 | outer_start &= ~0UL << order; | |
6758 | } | |
6759 | ||
6760 | /* Make sure the range is really isolated. */ | |
b023f468 | 6761 | if (test_pages_isolated(outer_start, end, false)) { |
dae803e1 MN |
6762 | pr_info("%s: [%lx, %lx) PFNs busy\n", |
6763 | __func__, outer_start, end); | |
041d3a8c MN |
6764 | ret = -EBUSY; |
6765 | goto done; | |
6766 | } | |
6767 | ||
49f223a9 | 6768 | /* Grab isolated pages from freelists. */ |
bb13ffeb | 6769 | outer_end = isolate_freepages_range(&cc, outer_start, end); |
041d3a8c MN |
6770 | if (!outer_end) { |
6771 | ret = -EBUSY; | |
6772 | goto done; | |
6773 | } | |
6774 | ||
6775 | /* Free head and tail (if any) */ | |
6776 | if (start != outer_start) | |
6777 | free_contig_range(outer_start, start - outer_start); | |
6778 | if (end != outer_end) | |
6779 | free_contig_range(end, outer_end - end); | |
6780 | ||
6781 | done: | |
6782 | undo_isolate_page_range(pfn_max_align_down(start), | |
0815f3d8 | 6783 | pfn_max_align_up(end), migratetype); |
041d3a8c MN |
6784 | return ret; |
6785 | } | |
6786 | ||
6787 | void free_contig_range(unsigned long pfn, unsigned nr_pages) | |
6788 | { | |
bcc2b02f MS |
6789 | unsigned int count = 0; |
6790 | ||
6791 | for (; nr_pages--; pfn++) { | |
6792 | struct page *page = pfn_to_page(pfn); | |
6793 | ||
6794 | count += page_count(page) != 1; | |
6795 | __free_page(page); | |
6796 | } | |
6797 | WARN(count != 0, "%d pages are still in use!\n", count); | |
041d3a8c MN |
6798 | } |
6799 | #endif | |
6800 | ||
4ed7e022 | 6801 | #ifdef CONFIG_MEMORY_HOTPLUG |
0a647f38 CS |
6802 | /* |
6803 | * The zone indicated has a new number of managed_pages; batch sizes and percpu | |
6804 | * page high values need to be recalulated. | |
6805 | */ | |
4ed7e022 JL |
6806 | void __meminit zone_pcp_update(struct zone *zone) |
6807 | { | |
0a647f38 | 6808 | unsigned cpu; |
c8e251fa | 6809 | mutex_lock(&pcp_batch_high_lock); |
0a647f38 | 6810 | for_each_possible_cpu(cpu) |
169f6c19 CS |
6811 | pageset_set_high_and_batch(zone, |
6812 | per_cpu_ptr(zone->pageset, cpu)); | |
c8e251fa | 6813 | mutex_unlock(&pcp_batch_high_lock); |
4ed7e022 JL |
6814 | } |
6815 | #endif | |
6816 | ||
340175b7 JL |
6817 | void zone_pcp_reset(struct zone *zone) |
6818 | { | |
6819 | unsigned long flags; | |
5a883813 MK |
6820 | int cpu; |
6821 | struct per_cpu_pageset *pset; | |
340175b7 JL |
6822 | |
6823 | /* avoid races with drain_pages() */ | |
6824 | local_irq_save(flags); | |
6825 | if (zone->pageset != &boot_pageset) { | |
5a883813 MK |
6826 | for_each_online_cpu(cpu) { |
6827 | pset = per_cpu_ptr(zone->pageset, cpu); | |
6828 | drain_zonestat(zone, pset); | |
6829 | } | |
340175b7 JL |
6830 | free_percpu(zone->pageset); |
6831 | zone->pageset = &boot_pageset; | |
6832 | } | |
6833 | local_irq_restore(flags); | |
6834 | } | |
6835 | ||
6dcd73d7 | 6836 | #ifdef CONFIG_MEMORY_HOTREMOVE |
0c0e6195 KH |
6837 | /* |
6838 | * All pages in the range must be isolated before calling this. | |
6839 | */ | |
6840 | void | |
6841 | __offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn) | |
6842 | { | |
6843 | struct page *page; | |
6844 | struct zone *zone; | |
7aeb09f9 | 6845 | unsigned int order, i; |
0c0e6195 KH |
6846 | unsigned long pfn; |
6847 | unsigned long flags; | |
6848 | /* find the first valid pfn */ | |
6849 | for (pfn = start_pfn; pfn < end_pfn; pfn++) | |
6850 | if (pfn_valid(pfn)) | |
6851 | break; | |
6852 | if (pfn == end_pfn) | |
6853 | return; | |
6854 | zone = page_zone(pfn_to_page(pfn)); | |
6855 | spin_lock_irqsave(&zone->lock, flags); | |
6856 | pfn = start_pfn; | |
6857 | while (pfn < end_pfn) { | |
6858 | if (!pfn_valid(pfn)) { | |
6859 | pfn++; | |
6860 | continue; | |
6861 | } | |
6862 | page = pfn_to_page(pfn); | |
b023f468 WC |
6863 | /* |
6864 | * The HWPoisoned page may be not in buddy system, and | |
6865 | * page_count() is not 0. | |
6866 | */ | |
6867 | if (unlikely(!PageBuddy(page) && PageHWPoison(page))) { | |
6868 | pfn++; | |
6869 | SetPageReserved(page); | |
6870 | continue; | |
6871 | } | |
6872 | ||
0c0e6195 KH |
6873 | BUG_ON(page_count(page)); |
6874 | BUG_ON(!PageBuddy(page)); | |
6875 | order = page_order(page); | |
6876 | #ifdef CONFIG_DEBUG_VM | |
6877 | printk(KERN_INFO "remove from free list %lx %d %lx\n", | |
6878 | pfn, 1 << order, end_pfn); | |
6879 | #endif | |
6880 | list_del(&page->lru); | |
6881 | rmv_page_order(page); | |
6882 | zone->free_area[order].nr_free--; | |
0c0e6195 KH |
6883 | for (i = 0; i < (1 << order); i++) |
6884 | SetPageReserved((page+i)); | |
6885 | pfn += (1 << order); | |
6886 | } | |
6887 | spin_unlock_irqrestore(&zone->lock, flags); | |
6888 | } | |
6889 | #endif | |
8d22ba1b WF |
6890 | |
6891 | #ifdef CONFIG_MEMORY_FAILURE | |
6892 | bool is_free_buddy_page(struct page *page) | |
6893 | { | |
6894 | struct zone *zone = page_zone(page); | |
6895 | unsigned long pfn = page_to_pfn(page); | |
6896 | unsigned long flags; | |
7aeb09f9 | 6897 | unsigned int order; |
8d22ba1b WF |
6898 | |
6899 | spin_lock_irqsave(&zone->lock, flags); | |
6900 | for (order = 0; order < MAX_ORDER; order++) { | |
6901 | struct page *page_head = page - (pfn & ((1 << order) - 1)); | |
6902 | ||
6903 | if (PageBuddy(page_head) && page_order(page_head) >= order) | |
6904 | break; | |
6905 | } | |
6906 | spin_unlock_irqrestore(&zone->lock, flags); | |
6907 | ||
6908 | return order < MAX_ORDER; | |
6909 | } | |
6910 | #endif |