Commit | Line | Data |
---|---|---|
52d4b9ac KH |
1 | #include <linux/mm.h> |
2 | #include <linux/mmzone.h> | |
3 | #include <linux/bootmem.h> | |
4 | #include <linux/bit_spinlock.h> | |
5 | #include <linux/page_cgroup.h> | |
6 | #include <linux/hash.h> | |
94b6da5a | 7 | #include <linux/slab.h> |
52d4b9ac | 8 | #include <linux/memory.h> |
4c821042 | 9 | #include <linux/vmalloc.h> |
94b6da5a | 10 | #include <linux/cgroup.h> |
27a7faa0 | 11 | #include <linux/swapops.h> |
7952f988 | 12 | #include <linux/kmemleak.h> |
52d4b9ac | 13 | |
6b3ae58e | 14 | static void __meminit init_page_cgroup(struct page_cgroup *pc, unsigned long id) |
52d4b9ac KH |
15 | { |
16 | pc->flags = 0; | |
6b3ae58e | 17 | set_page_cgroup_array_id(pc, id); |
52d4b9ac | 18 | pc->mem_cgroup = NULL; |
08e552c6 | 19 | INIT_LIST_HEAD(&pc->lru); |
52d4b9ac KH |
20 | } |
21 | static unsigned long total_usage; | |
22 | ||
23 | #if !defined(CONFIG_SPARSEMEM) | |
24 | ||
25 | ||
31168481 | 26 | void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat) |
52d4b9ac KH |
27 | { |
28 | pgdat->node_page_cgroup = NULL; | |
29 | } | |
30 | ||
31 | struct page_cgroup *lookup_page_cgroup(struct page *page) | |
32 | { | |
33 | unsigned long pfn = page_to_pfn(page); | |
34 | unsigned long offset; | |
35 | struct page_cgroup *base; | |
36 | ||
37 | base = NODE_DATA(page_to_nid(page))->node_page_cgroup; | |
38 | if (unlikely(!base)) | |
39 | return NULL; | |
40 | ||
41 | offset = pfn - NODE_DATA(page_to_nid(page))->node_start_pfn; | |
42 | return base + offset; | |
43 | } | |
44 | ||
6b3ae58e JW |
45 | struct page *lookup_cgroup_page(struct page_cgroup *pc) |
46 | { | |
47 | unsigned long pfn; | |
48 | struct page *page; | |
49 | pg_data_t *pgdat; | |
50 | ||
51 | pgdat = NODE_DATA(page_cgroup_array_id(pc)); | |
52 | pfn = pc - pgdat->node_page_cgroup + pgdat->node_start_pfn; | |
53 | page = pfn_to_page(pfn); | |
54 | VM_BUG_ON(pc != lookup_page_cgroup(page)); | |
55 | return page; | |
56 | } | |
57 | ||
52d4b9ac KH |
58 | static int __init alloc_node_page_cgroup(int nid) |
59 | { | |
60 | struct page_cgroup *base, *pc; | |
61 | unsigned long table_size; | |
62 | unsigned long start_pfn, nr_pages, index; | |
63 | ||
64 | start_pfn = NODE_DATA(nid)->node_start_pfn; | |
65 | nr_pages = NODE_DATA(nid)->node_spanned_pages; | |
66 | ||
653d22c0 KH |
67 | if (!nr_pages) |
68 | return 0; | |
69 | ||
52d4b9ac | 70 | table_size = sizeof(struct page_cgroup) * nr_pages; |
ca371c0d KH |
71 | |
72 | base = __alloc_bootmem_node_nopanic(NODE_DATA(nid), | |
73 | table_size, PAGE_SIZE, __pa(MAX_DMA_ADDRESS)); | |
74 | if (!base) | |
52d4b9ac KH |
75 | return -ENOMEM; |
76 | for (index = 0; index < nr_pages; index++) { | |
77 | pc = base + index; | |
6b3ae58e | 78 | init_page_cgroup(pc, nid); |
52d4b9ac KH |
79 | } |
80 | NODE_DATA(nid)->node_page_cgroup = base; | |
81 | total_usage += table_size; | |
82 | return 0; | |
83 | } | |
84 | ||
ca371c0d | 85 | void __init page_cgroup_init_flatmem(void) |
52d4b9ac KH |
86 | { |
87 | ||
88 | int nid, fail; | |
89 | ||
f8d66542 | 90 | if (mem_cgroup_disabled()) |
94b6da5a KH |
91 | return; |
92 | ||
52d4b9ac KH |
93 | for_each_online_node(nid) { |
94 | fail = alloc_node_page_cgroup(nid); | |
95 | if (fail) | |
96 | goto fail; | |
97 | } | |
98 | printk(KERN_INFO "allocated %ld bytes of page_cgroup\n", total_usage); | |
8ca739e3 RD |
99 | printk(KERN_INFO "please try 'cgroup_disable=memory' option if you" |
100 | " don't want memory cgroups\n"); | |
52d4b9ac KH |
101 | return; |
102 | fail: | |
8ca739e3 RD |
103 | printk(KERN_CRIT "allocation of page_cgroup failed.\n"); |
104 | printk(KERN_CRIT "please try 'cgroup_disable=memory' boot option\n"); | |
52d4b9ac KH |
105 | panic("Out of memory"); |
106 | } | |
107 | ||
108 | #else /* CONFIG_FLAT_NODE_MEM_MAP */ | |
109 | ||
110 | struct page_cgroup *lookup_page_cgroup(struct page *page) | |
111 | { | |
112 | unsigned long pfn = page_to_pfn(page); | |
113 | struct mem_section *section = __pfn_to_section(pfn); | |
114 | ||
d69b042f BS |
115 | if (!section->page_cgroup) |
116 | return NULL; | |
52d4b9ac KH |
117 | return section->page_cgroup + pfn; |
118 | } | |
119 | ||
6b3ae58e JW |
120 | struct page *lookup_cgroup_page(struct page_cgroup *pc) |
121 | { | |
122 | struct mem_section *section; | |
123 | struct page *page; | |
124 | unsigned long nr; | |
125 | ||
126 | nr = page_cgroup_array_id(pc); | |
127 | section = __nr_to_section(nr); | |
128 | page = pfn_to_page(pc - section->page_cgroup); | |
129 | VM_BUG_ON(pc != lookup_page_cgroup(page)); | |
130 | return page; | |
131 | } | |
132 | ||
268433b8 | 133 | static void *__meminit alloc_page_cgroup(size_t size, int nid) |
dde79e00 MH |
134 | { |
135 | void *addr = NULL; | |
ff7ee93f | 136 | gfp_t flags = GFP_KERNEL | __GFP_NOWARN; |
dde79e00 | 137 | |
ff7ee93f SR |
138 | addr = alloc_pages_exact_nid(nid, size, flags); |
139 | if (addr) { | |
140 | kmemleak_alloc(addr, size, 1, flags); | |
dde79e00 | 141 | return addr; |
ff7ee93f | 142 | } |
dde79e00 MH |
143 | |
144 | if (node_state(nid, N_HIGH_MEMORY)) | |
145 | addr = vmalloc_node(size, nid); | |
146 | else | |
147 | addr = vmalloc(size); | |
148 | ||
149 | return addr; | |
150 | } | |
151 | ||
152 | #ifdef CONFIG_MEMORY_HOTPLUG | |
153 | static void free_page_cgroup(void *addr) | |
154 | { | |
155 | if (is_vmalloc_addr(addr)) { | |
156 | vfree(addr); | |
157 | } else { | |
158 | struct page *page = virt_to_page(addr); | |
6cfddb26 MH |
159 | size_t table_size = |
160 | sizeof(struct page_cgroup) * PAGES_PER_SECTION; | |
161 | ||
162 | BUG_ON(PageReserved(page)); | |
163 | free_pages_exact(addr, table_size); | |
dde79e00 MH |
164 | } |
165 | } | |
166 | #endif | |
167 | ||
37573e8c | 168 | static int __meminit init_section_page_cgroup(unsigned long pfn, int nid) |
52d4b9ac | 169 | { |
52d4b9ac | 170 | struct page_cgroup *base, *pc; |
6b3ae58e | 171 | struct mem_section *section; |
52d4b9ac | 172 | unsigned long table_size; |
6b3ae58e | 173 | unsigned long nr; |
37573e8c | 174 | int index; |
52d4b9ac | 175 | |
6b3ae58e JW |
176 | nr = pfn_to_section_nr(pfn); |
177 | section = __nr_to_section(nr); | |
178 | ||
179 | if (section->page_cgroup) | |
180 | return 0; | |
181 | ||
6b3ae58e | 182 | table_size = sizeof(struct page_cgroup) * PAGES_PER_SECTION; |
dde79e00 MH |
183 | base = alloc_page_cgroup(table_size, nid); |
184 | ||
6b3ae58e JW |
185 | /* |
186 | * The value stored in section->page_cgroup is (base - pfn) | |
187 | * and it does not point to the memory block allocated above, | |
188 | * causing kmemleak false positives. | |
189 | */ | |
190 | kmemleak_not_leak(base); | |
52d4b9ac KH |
191 | |
192 | if (!base) { | |
193 | printk(KERN_ERR "page cgroup allocation failure\n"); | |
194 | return -ENOMEM; | |
195 | } | |
196 | ||
197 | for (index = 0; index < PAGES_PER_SECTION; index++) { | |
198 | pc = base + index; | |
6b3ae58e | 199 | init_page_cgroup(pc, nr); |
52d4b9ac | 200 | } |
37573e8c KH |
201 | /* |
202 | * The passed "pfn" may not be aligned to SECTION. For the calculation | |
203 | * we need to apply a mask. | |
204 | */ | |
205 | pfn &= PAGE_SECTION_MASK; | |
52d4b9ac KH |
206 | section->page_cgroup = base - pfn; |
207 | total_usage += table_size; | |
208 | return 0; | |
209 | } | |
210 | #ifdef CONFIG_MEMORY_HOTPLUG | |
211 | void __free_page_cgroup(unsigned long pfn) | |
212 | { | |
213 | struct mem_section *ms; | |
214 | struct page_cgroup *base; | |
215 | ||
216 | ms = __pfn_to_section(pfn); | |
217 | if (!ms || !ms->page_cgroup) | |
218 | return; | |
219 | base = ms->page_cgroup + pfn; | |
dde79e00 MH |
220 | free_page_cgroup(base); |
221 | ms->page_cgroup = NULL; | |
52d4b9ac KH |
222 | } |
223 | ||
31168481 | 224 | int __meminit online_page_cgroup(unsigned long start_pfn, |
52d4b9ac KH |
225 | unsigned long nr_pages, |
226 | int nid) | |
227 | { | |
228 | unsigned long start, end, pfn; | |
229 | int fail = 0; | |
230 | ||
1bb36fbd DK |
231 | start = SECTION_ALIGN_DOWN(start_pfn); |
232 | end = SECTION_ALIGN_UP(start_pfn + nr_pages); | |
52d4b9ac | 233 | |
37573e8c KH |
234 | if (nid == -1) { |
235 | /* | |
236 | * In this case, "nid" already exists and contains valid memory. | |
237 | * "start_pfn" passed to us is a pfn which is an arg for | |
238 | * online__pages(), and start_pfn should exist. | |
239 | */ | |
240 | nid = pfn_to_nid(start_pfn); | |
241 | VM_BUG_ON(!node_state(nid, N_ONLINE)); | |
242 | } | |
243 | ||
52d4b9ac KH |
244 | for (pfn = start; !fail && pfn < end; pfn += PAGES_PER_SECTION) { |
245 | if (!pfn_present(pfn)) | |
246 | continue; | |
37573e8c | 247 | fail = init_section_page_cgroup(pfn, nid); |
52d4b9ac KH |
248 | } |
249 | if (!fail) | |
250 | return 0; | |
251 | ||
252 | /* rollback */ | |
253 | for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION) | |
254 | __free_page_cgroup(pfn); | |
255 | ||
256 | return -ENOMEM; | |
257 | } | |
258 | ||
31168481 | 259 | int __meminit offline_page_cgroup(unsigned long start_pfn, |
52d4b9ac KH |
260 | unsigned long nr_pages, int nid) |
261 | { | |
262 | unsigned long start, end, pfn; | |
263 | ||
1bb36fbd DK |
264 | start = SECTION_ALIGN_DOWN(start_pfn); |
265 | end = SECTION_ALIGN_UP(start_pfn + nr_pages); | |
52d4b9ac KH |
266 | |
267 | for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION) | |
268 | __free_page_cgroup(pfn); | |
269 | return 0; | |
270 | ||
271 | } | |
272 | ||
31168481 | 273 | static int __meminit page_cgroup_callback(struct notifier_block *self, |
52d4b9ac KH |
274 | unsigned long action, void *arg) |
275 | { | |
276 | struct memory_notify *mn = arg; | |
277 | int ret = 0; | |
278 | switch (action) { | |
279 | case MEM_GOING_ONLINE: | |
280 | ret = online_page_cgroup(mn->start_pfn, | |
281 | mn->nr_pages, mn->status_change_nid); | |
282 | break; | |
52d4b9ac KH |
283 | case MEM_OFFLINE: |
284 | offline_page_cgroup(mn->start_pfn, | |
285 | mn->nr_pages, mn->status_change_nid); | |
286 | break; | |
dc19f9db | 287 | case MEM_CANCEL_ONLINE: |
52d4b9ac KH |
288 | case MEM_GOING_OFFLINE: |
289 | break; | |
290 | case MEM_ONLINE: | |
291 | case MEM_CANCEL_OFFLINE: | |
292 | break; | |
293 | } | |
dc19f9db | 294 | |
5fda1bd5 | 295 | return notifier_from_errno(ret); |
52d4b9ac KH |
296 | } |
297 | ||
298 | #endif | |
299 | ||
300 | void __init page_cgroup_init(void) | |
301 | { | |
302 | unsigned long pfn; | |
37573e8c | 303 | int nid; |
52d4b9ac | 304 | |
f8d66542 | 305 | if (mem_cgroup_disabled()) |
94b6da5a KH |
306 | return; |
307 | ||
37573e8c KH |
308 | for_each_node_state(nid, N_HIGH_MEMORY) { |
309 | unsigned long start_pfn, end_pfn; | |
310 | ||
311 | start_pfn = node_start_pfn(nid); | |
312 | end_pfn = node_end_pfn(nid); | |
313 | /* | |
314 | * start_pfn and end_pfn may not be aligned to SECTION and the | |
315 | * page->flags of out of node pages are not initialized. So we | |
316 | * scan [start_pfn, the biggest section's pfn < end_pfn) here. | |
317 | */ | |
318 | for (pfn = start_pfn; | |
319 | pfn < end_pfn; | |
320 | pfn = ALIGN(pfn + 1, PAGES_PER_SECTION)) { | |
321 | ||
322 | if (!pfn_valid(pfn)) | |
323 | continue; | |
324 | /* | |
325 | * Nodes's pfns can be overlapping. | |
326 | * We know some arch can have a nodes layout such as | |
327 | * -------------pfn--------------> | |
328 | * N0 | N1 | N2 | N0 | N1 | N2|.... | |
329 | */ | |
330 | if (pfn_to_nid(pfn) != nid) | |
331 | continue; | |
332 | if (init_section_page_cgroup(pfn, nid)) | |
333 | goto oom; | |
334 | } | |
52d4b9ac | 335 | } |
37573e8c | 336 | hotplug_memory_notifier(page_cgroup_callback, 0); |
52d4b9ac | 337 | printk(KERN_INFO "allocated %ld bytes of page_cgroup\n", total_usage); |
37573e8c KH |
338 | printk(KERN_INFO "please try 'cgroup_disable=memory' option if you " |
339 | "don't want memory cgroups\n"); | |
340 | return; | |
341 | oom: | |
342 | printk(KERN_CRIT "try 'cgroup_disable=memory' boot option\n"); | |
343 | panic("Out of memory"); | |
52d4b9ac KH |
344 | } |
345 | ||
31168481 | 346 | void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat) |
52d4b9ac KH |
347 | { |
348 | return; | |
349 | } | |
350 | ||
351 | #endif | |
27a7faa0 KH |
352 | |
353 | ||
354 | #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP | |
355 | ||
356 | static DEFINE_MUTEX(swap_cgroup_mutex); | |
357 | struct swap_cgroup_ctrl { | |
358 | struct page **map; | |
359 | unsigned long length; | |
e9e58a4e | 360 | spinlock_t lock; |
27a7faa0 KH |
361 | }; |
362 | ||
61600f57 | 363 | static struct swap_cgroup_ctrl swap_cgroup_ctrl[MAX_SWAPFILES]; |
27a7faa0 | 364 | |
27a7faa0 | 365 | struct swap_cgroup { |
a3b2d692 | 366 | unsigned short id; |
27a7faa0 KH |
367 | }; |
368 | #define SC_PER_PAGE (PAGE_SIZE/sizeof(struct swap_cgroup)) | |
369 | #define SC_POS_MASK (SC_PER_PAGE - 1) | |
370 | ||
371 | /* | |
372 | * SwapCgroup implements "lookup" and "exchange" operations. | |
373 | * In typical usage, this swap_cgroup is accessed via memcg's charge/uncharge | |
374 | * against SwapCache. At swap_free(), this is accessed directly from swap. | |
375 | * | |
376 | * This means, | |
377 | * - we have no race in "exchange" when we're accessed via SwapCache because | |
378 | * SwapCache(and its swp_entry) is under lock. | |
379 | * - When called via swap_free(), there is no user of this entry and no race. | |
380 | * Then, we don't need lock around "exchange". | |
381 | * | |
382 | * TODO: we can push these buffers out to HIGHMEM. | |
383 | */ | |
384 | ||
385 | /* | |
386 | * allocate buffer for swap_cgroup. | |
387 | */ | |
388 | static int swap_cgroup_prepare(int type) | |
389 | { | |
390 | struct page *page; | |
391 | struct swap_cgroup_ctrl *ctrl; | |
392 | unsigned long idx, max; | |
393 | ||
27a7faa0 KH |
394 | ctrl = &swap_cgroup_ctrl[type]; |
395 | ||
396 | for (idx = 0; idx < ctrl->length; idx++) { | |
397 | page = alloc_page(GFP_KERNEL | __GFP_ZERO); | |
398 | if (!page) | |
399 | goto not_enough_page; | |
400 | ctrl->map[idx] = page; | |
401 | } | |
402 | return 0; | |
403 | not_enough_page: | |
404 | max = idx; | |
405 | for (idx = 0; idx < max; idx++) | |
406 | __free_page(ctrl->map[idx]); | |
407 | ||
408 | return -ENOMEM; | |
409 | } | |
410 | ||
02491447 DN |
411 | /** |
412 | * swap_cgroup_cmpxchg - cmpxchg mem_cgroup's id for this swp_entry. | |
413 | * @end: swap entry to be cmpxchged | |
414 | * @old: old id | |
415 | * @new: new id | |
416 | * | |
417 | * Returns old id at success, 0 at failure. | |
25985edc | 418 | * (There is no mem_cgroup using 0 as its id) |
02491447 DN |
419 | */ |
420 | unsigned short swap_cgroup_cmpxchg(swp_entry_t ent, | |
421 | unsigned short old, unsigned short new) | |
422 | { | |
423 | int type = swp_type(ent); | |
424 | unsigned long offset = swp_offset(ent); | |
425 | unsigned long idx = offset / SC_PER_PAGE; | |
426 | unsigned long pos = offset & SC_POS_MASK; | |
427 | struct swap_cgroup_ctrl *ctrl; | |
428 | struct page *mappage; | |
429 | struct swap_cgroup *sc; | |
e9e58a4e KH |
430 | unsigned long flags; |
431 | unsigned short retval; | |
02491447 DN |
432 | |
433 | ctrl = &swap_cgroup_ctrl[type]; | |
434 | ||
435 | mappage = ctrl->map[idx]; | |
436 | sc = page_address(mappage); | |
437 | sc += pos; | |
e9e58a4e KH |
438 | spin_lock_irqsave(&ctrl->lock, flags); |
439 | retval = sc->id; | |
440 | if (retval == old) | |
441 | sc->id = new; | |
02491447 | 442 | else |
e9e58a4e KH |
443 | retval = 0; |
444 | spin_unlock_irqrestore(&ctrl->lock, flags); | |
445 | return retval; | |
02491447 DN |
446 | } |
447 | ||
27a7faa0 KH |
448 | /** |
449 | * swap_cgroup_record - record mem_cgroup for this swp_entry. | |
450 | * @ent: swap entry to be recorded into | |
451 | * @mem: mem_cgroup to be recorded | |
452 | * | |
a3b2d692 KH |
453 | * Returns old value at success, 0 at failure. |
454 | * (Of course, old value can be 0.) | |
27a7faa0 | 455 | */ |
a3b2d692 | 456 | unsigned short swap_cgroup_record(swp_entry_t ent, unsigned short id) |
27a7faa0 KH |
457 | { |
458 | int type = swp_type(ent); | |
459 | unsigned long offset = swp_offset(ent); | |
460 | unsigned long idx = offset / SC_PER_PAGE; | |
461 | unsigned long pos = offset & SC_POS_MASK; | |
462 | struct swap_cgroup_ctrl *ctrl; | |
463 | struct page *mappage; | |
464 | struct swap_cgroup *sc; | |
a3b2d692 | 465 | unsigned short old; |
e9e58a4e | 466 | unsigned long flags; |
27a7faa0 | 467 | |
27a7faa0 KH |
468 | ctrl = &swap_cgroup_ctrl[type]; |
469 | ||
470 | mappage = ctrl->map[idx]; | |
471 | sc = page_address(mappage); | |
472 | sc += pos; | |
e9e58a4e KH |
473 | spin_lock_irqsave(&ctrl->lock, flags); |
474 | old = sc->id; | |
475 | sc->id = id; | |
476 | spin_unlock_irqrestore(&ctrl->lock, flags); | |
27a7faa0 KH |
477 | |
478 | return old; | |
479 | } | |
480 | ||
481 | /** | |
482 | * lookup_swap_cgroup - lookup mem_cgroup tied to swap entry | |
483 | * @ent: swap entry to be looked up. | |
484 | * | |
a3b2d692 | 485 | * Returns CSS ID of mem_cgroup at success. 0 at failure. (0 is invalid ID) |
27a7faa0 | 486 | */ |
a3b2d692 | 487 | unsigned short lookup_swap_cgroup(swp_entry_t ent) |
27a7faa0 KH |
488 | { |
489 | int type = swp_type(ent); | |
490 | unsigned long offset = swp_offset(ent); | |
491 | unsigned long idx = offset / SC_PER_PAGE; | |
492 | unsigned long pos = offset & SC_POS_MASK; | |
493 | struct swap_cgroup_ctrl *ctrl; | |
494 | struct page *mappage; | |
495 | struct swap_cgroup *sc; | |
a3b2d692 | 496 | unsigned short ret; |
27a7faa0 | 497 | |
27a7faa0 KH |
498 | ctrl = &swap_cgroup_ctrl[type]; |
499 | mappage = ctrl->map[idx]; | |
500 | sc = page_address(mappage); | |
501 | sc += pos; | |
a3b2d692 | 502 | ret = sc->id; |
27a7faa0 KH |
503 | return ret; |
504 | } | |
505 | ||
506 | int swap_cgroup_swapon(int type, unsigned long max_pages) | |
507 | { | |
508 | void *array; | |
509 | unsigned long array_size; | |
510 | unsigned long length; | |
511 | struct swap_cgroup_ctrl *ctrl; | |
512 | ||
513 | if (!do_swap_account) | |
514 | return 0; | |
515 | ||
33278f7f | 516 | length = DIV_ROUND_UP(max_pages, SC_PER_PAGE); |
27a7faa0 KH |
517 | array_size = length * sizeof(void *); |
518 | ||
8c1fec1b | 519 | array = vzalloc(array_size); |
27a7faa0 KH |
520 | if (!array) |
521 | goto nomem; | |
522 | ||
27a7faa0 KH |
523 | ctrl = &swap_cgroup_ctrl[type]; |
524 | mutex_lock(&swap_cgroup_mutex); | |
525 | ctrl->length = length; | |
526 | ctrl->map = array; | |
e9e58a4e | 527 | spin_lock_init(&ctrl->lock); |
27a7faa0 KH |
528 | if (swap_cgroup_prepare(type)) { |
529 | /* memory shortage */ | |
530 | ctrl->map = NULL; | |
531 | ctrl->length = 0; | |
27a7faa0 | 532 | mutex_unlock(&swap_cgroup_mutex); |
6a5b18d2 | 533 | vfree(array); |
27a7faa0 KH |
534 | goto nomem; |
535 | } | |
536 | mutex_unlock(&swap_cgroup_mutex); | |
537 | ||
27a7faa0 KH |
538 | return 0; |
539 | nomem: | |
540 | printk(KERN_INFO "couldn't allocate enough memory for swap_cgroup.\n"); | |
541 | printk(KERN_INFO | |
00a66d29 | 542 | "swap_cgroup can be disabled by swapaccount=0 boot option\n"); |
27a7faa0 KH |
543 | return -ENOMEM; |
544 | } | |
545 | ||
546 | void swap_cgroup_swapoff(int type) | |
547 | { | |
6a5b18d2 NK |
548 | struct page **map; |
549 | unsigned long i, length; | |
27a7faa0 KH |
550 | struct swap_cgroup_ctrl *ctrl; |
551 | ||
552 | if (!do_swap_account) | |
553 | return; | |
554 | ||
555 | mutex_lock(&swap_cgroup_mutex); | |
556 | ctrl = &swap_cgroup_ctrl[type]; | |
6a5b18d2 NK |
557 | map = ctrl->map; |
558 | length = ctrl->length; | |
559 | ctrl->map = NULL; | |
560 | ctrl->length = 0; | |
561 | mutex_unlock(&swap_cgroup_mutex); | |
562 | ||
563 | if (map) { | |
564 | for (i = 0; i < length; i++) { | |
565 | struct page *page = map[i]; | |
27a7faa0 KH |
566 | if (page) |
567 | __free_page(page); | |
568 | } | |
6a5b18d2 | 569 | vfree(map); |
27a7faa0 | 570 | } |
27a7faa0 KH |
571 | } |
572 | ||
573 | #endif |