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8cdea7c0 BS |
1 | /* memcontrol.c - Memory Controller |
2 | * | |
3 | * Copyright IBM Corporation, 2007 | |
4 | * Author Balbir Singh <balbir@linux.vnet.ibm.com> | |
5 | * | |
78fb7466 PE |
6 | * Copyright 2007 OpenVZ SWsoft Inc |
7 | * Author: Pavel Emelianov <xemul@openvz.org> | |
8 | * | |
8cdea7c0 BS |
9 | * This program is free software; you can redistribute it and/or modify |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | */ | |
19 | ||
20 | #include <linux/res_counter.h> | |
21 | #include <linux/memcontrol.h> | |
22 | #include <linux/cgroup.h> | |
78fb7466 | 23 | #include <linux/mm.h> |
d13d1443 | 24 | #include <linux/pagemap.h> |
d52aa412 | 25 | #include <linux/smp.h> |
8a9f3ccd | 26 | #include <linux/page-flags.h> |
66e1707b | 27 | #include <linux/backing-dev.h> |
8a9f3ccd BS |
28 | #include <linux/bit_spinlock.h> |
29 | #include <linux/rcupdate.h> | |
8c7c6e34 | 30 | #include <linux/mutex.h> |
b6ac57d5 | 31 | #include <linux/slab.h> |
66e1707b BS |
32 | #include <linux/swap.h> |
33 | #include <linux/spinlock.h> | |
34 | #include <linux/fs.h> | |
d2ceb9b7 | 35 | #include <linux/seq_file.h> |
33327948 | 36 | #include <linux/vmalloc.h> |
b69408e8 | 37 | #include <linux/mm_inline.h> |
52d4b9ac | 38 | #include <linux/page_cgroup.h> |
08e552c6 | 39 | #include "internal.h" |
8cdea7c0 | 40 | |
8697d331 BS |
41 | #include <asm/uaccess.h> |
42 | ||
a181b0e8 | 43 | struct cgroup_subsys mem_cgroup_subsys __read_mostly; |
a181b0e8 | 44 | #define MEM_CGROUP_RECLAIM_RETRIES 5 |
8cdea7c0 | 45 | |
c077719b KH |
46 | #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP |
47 | /* Turned on only when memory cgroup is enabled && really_do_swap_account = 0 */ | |
48 | int do_swap_account __read_mostly; | |
49 | static int really_do_swap_account __initdata = 1; /* for remember boot option*/ | |
50 | #else | |
51 | #define do_swap_account (0) | |
52 | #endif | |
53 | ||
54 | ||
d52aa412 KH |
55 | /* |
56 | * Statistics for memory cgroup. | |
57 | */ | |
58 | enum mem_cgroup_stat_index { | |
59 | /* | |
60 | * For MEM_CONTAINER_TYPE_ALL, usage = pagecache + rss. | |
61 | */ | |
62 | MEM_CGROUP_STAT_CACHE, /* # of pages charged as cache */ | |
63 | MEM_CGROUP_STAT_RSS, /* # of pages charged as rss */ | |
55e462b0 BR |
64 | MEM_CGROUP_STAT_PGPGIN_COUNT, /* # of pages paged in */ |
65 | MEM_CGROUP_STAT_PGPGOUT_COUNT, /* # of pages paged out */ | |
d52aa412 KH |
66 | |
67 | MEM_CGROUP_STAT_NSTATS, | |
68 | }; | |
69 | ||
70 | struct mem_cgroup_stat_cpu { | |
71 | s64 count[MEM_CGROUP_STAT_NSTATS]; | |
72 | } ____cacheline_aligned_in_smp; | |
73 | ||
74 | struct mem_cgroup_stat { | |
c8dad2bb | 75 | struct mem_cgroup_stat_cpu cpustat[0]; |
d52aa412 KH |
76 | }; |
77 | ||
78 | /* | |
79 | * For accounting under irq disable, no need for increment preempt count. | |
80 | */ | |
addb9efe | 81 | static inline void __mem_cgroup_stat_add_safe(struct mem_cgroup_stat_cpu *stat, |
d52aa412 KH |
82 | enum mem_cgroup_stat_index idx, int val) |
83 | { | |
addb9efe | 84 | stat->count[idx] += val; |
d52aa412 KH |
85 | } |
86 | ||
87 | static s64 mem_cgroup_read_stat(struct mem_cgroup_stat *stat, | |
88 | enum mem_cgroup_stat_index idx) | |
89 | { | |
90 | int cpu; | |
91 | s64 ret = 0; | |
92 | for_each_possible_cpu(cpu) | |
93 | ret += stat->cpustat[cpu].count[idx]; | |
94 | return ret; | |
95 | } | |
96 | ||
6d12e2d8 KH |
97 | /* |
98 | * per-zone information in memory controller. | |
99 | */ | |
6d12e2d8 | 100 | struct mem_cgroup_per_zone { |
072c56c1 KH |
101 | /* |
102 | * spin_lock to protect the per cgroup LRU | |
103 | */ | |
b69408e8 CL |
104 | struct list_head lists[NR_LRU_LISTS]; |
105 | unsigned long count[NR_LRU_LISTS]; | |
6d12e2d8 KH |
106 | }; |
107 | /* Macro for accessing counter */ | |
108 | #define MEM_CGROUP_ZSTAT(mz, idx) ((mz)->count[(idx)]) | |
109 | ||
110 | struct mem_cgroup_per_node { | |
111 | struct mem_cgroup_per_zone zoneinfo[MAX_NR_ZONES]; | |
112 | }; | |
113 | ||
114 | struct mem_cgroup_lru_info { | |
115 | struct mem_cgroup_per_node *nodeinfo[MAX_NUMNODES]; | |
116 | }; | |
117 | ||
8cdea7c0 BS |
118 | /* |
119 | * The memory controller data structure. The memory controller controls both | |
120 | * page cache and RSS per cgroup. We would eventually like to provide | |
121 | * statistics based on the statistics developed by Rik Van Riel for clock-pro, | |
122 | * to help the administrator determine what knobs to tune. | |
123 | * | |
124 | * TODO: Add a water mark for the memory controller. Reclaim will begin when | |
8a9f3ccd BS |
125 | * we hit the water mark. May be even add a low water mark, such that |
126 | * no reclaim occurs from a cgroup at it's low water mark, this is | |
127 | * a feature that will be implemented much later in the future. | |
8cdea7c0 BS |
128 | */ |
129 | struct mem_cgroup { | |
130 | struct cgroup_subsys_state css; | |
131 | /* | |
132 | * the counter to account for memory usage | |
133 | */ | |
134 | struct res_counter res; | |
8c7c6e34 KH |
135 | /* |
136 | * the counter to account for mem+swap usage. | |
137 | */ | |
138 | struct res_counter memsw; | |
78fb7466 PE |
139 | /* |
140 | * Per cgroup active and inactive list, similar to the | |
141 | * per zone LRU lists. | |
78fb7466 | 142 | */ |
6d12e2d8 | 143 | struct mem_cgroup_lru_info info; |
072c56c1 | 144 | |
6c48a1d0 | 145 | int prev_priority; /* for recording reclaim priority */ |
6d61ef40 BS |
146 | |
147 | /* | |
148 | * While reclaiming in a hiearchy, we cache the last child we | |
149 | * reclaimed from. Protected by cgroup_lock() | |
150 | */ | |
151 | struct mem_cgroup *last_scanned_child; | |
18f59ea7 BS |
152 | /* |
153 | * Should the accounting and control be hierarchical, per subtree? | |
154 | */ | |
155 | bool use_hierarchy; | |
a636b327 | 156 | unsigned long last_oom_jiffies; |
8c7c6e34 KH |
157 | int obsolete; |
158 | atomic_t refcnt; | |
d52aa412 | 159 | /* |
c8dad2bb | 160 | * statistics. This must be placed at the end of memcg. |
d52aa412 KH |
161 | */ |
162 | struct mem_cgroup_stat stat; | |
8cdea7c0 BS |
163 | }; |
164 | ||
217bc319 KH |
165 | enum charge_type { |
166 | MEM_CGROUP_CHARGE_TYPE_CACHE = 0, | |
167 | MEM_CGROUP_CHARGE_TYPE_MAPPED, | |
4f98a2fe | 168 | MEM_CGROUP_CHARGE_TYPE_SHMEM, /* used by page migration of shmem */ |
c05555b5 | 169 | MEM_CGROUP_CHARGE_TYPE_FORCE, /* used by force_empty */ |
d13d1443 | 170 | MEM_CGROUP_CHARGE_TYPE_SWAPOUT, /* for accounting swapcache */ |
c05555b5 KH |
171 | NR_CHARGE_TYPE, |
172 | }; | |
173 | ||
52d4b9ac KH |
174 | /* only for here (for easy reading.) */ |
175 | #define PCGF_CACHE (1UL << PCG_CACHE) | |
176 | #define PCGF_USED (1UL << PCG_USED) | |
52d4b9ac | 177 | #define PCGF_LOCK (1UL << PCG_LOCK) |
c05555b5 KH |
178 | static const unsigned long |
179 | pcg_default_flags[NR_CHARGE_TYPE] = { | |
08e552c6 KH |
180 | PCGF_CACHE | PCGF_USED | PCGF_LOCK, /* File Cache */ |
181 | PCGF_USED | PCGF_LOCK, /* Anon */ | |
182 | PCGF_CACHE | PCGF_USED | PCGF_LOCK, /* Shmem */ | |
52d4b9ac | 183 | 0, /* FORCE */ |
217bc319 KH |
184 | }; |
185 | ||
8c7c6e34 KH |
186 | |
187 | /* for encoding cft->private value on file */ | |
188 | #define _MEM (0) | |
189 | #define _MEMSWAP (1) | |
190 | #define MEMFILE_PRIVATE(x, val) (((x) << 16) | (val)) | |
191 | #define MEMFILE_TYPE(val) (((val) >> 16) & 0xffff) | |
192 | #define MEMFILE_ATTR(val) ((val) & 0xffff) | |
193 | ||
194 | static void mem_cgroup_get(struct mem_cgroup *mem); | |
195 | static void mem_cgroup_put(struct mem_cgroup *mem); | |
196 | ||
c05555b5 KH |
197 | static void mem_cgroup_charge_statistics(struct mem_cgroup *mem, |
198 | struct page_cgroup *pc, | |
199 | bool charge) | |
d52aa412 KH |
200 | { |
201 | int val = (charge)? 1 : -1; | |
202 | struct mem_cgroup_stat *stat = &mem->stat; | |
addb9efe | 203 | struct mem_cgroup_stat_cpu *cpustat; |
08e552c6 | 204 | int cpu = get_cpu(); |
d52aa412 | 205 | |
08e552c6 | 206 | cpustat = &stat->cpustat[cpu]; |
c05555b5 | 207 | if (PageCgroupCache(pc)) |
addb9efe | 208 | __mem_cgroup_stat_add_safe(cpustat, MEM_CGROUP_STAT_CACHE, val); |
d52aa412 | 209 | else |
addb9efe | 210 | __mem_cgroup_stat_add_safe(cpustat, MEM_CGROUP_STAT_RSS, val); |
55e462b0 BR |
211 | |
212 | if (charge) | |
addb9efe | 213 | __mem_cgroup_stat_add_safe(cpustat, |
55e462b0 BR |
214 | MEM_CGROUP_STAT_PGPGIN_COUNT, 1); |
215 | else | |
addb9efe | 216 | __mem_cgroup_stat_add_safe(cpustat, |
55e462b0 | 217 | MEM_CGROUP_STAT_PGPGOUT_COUNT, 1); |
08e552c6 | 218 | put_cpu(); |
6d12e2d8 KH |
219 | } |
220 | ||
d5b69e38 | 221 | static struct mem_cgroup_per_zone * |
6d12e2d8 KH |
222 | mem_cgroup_zoneinfo(struct mem_cgroup *mem, int nid, int zid) |
223 | { | |
6d12e2d8 KH |
224 | return &mem->info.nodeinfo[nid]->zoneinfo[zid]; |
225 | } | |
226 | ||
d5b69e38 | 227 | static struct mem_cgroup_per_zone * |
6d12e2d8 KH |
228 | page_cgroup_zoneinfo(struct page_cgroup *pc) |
229 | { | |
230 | struct mem_cgroup *mem = pc->mem_cgroup; | |
231 | int nid = page_cgroup_nid(pc); | |
232 | int zid = page_cgroup_zid(pc); | |
d52aa412 | 233 | |
6d12e2d8 KH |
234 | return mem_cgroup_zoneinfo(mem, nid, zid); |
235 | } | |
236 | ||
237 | static unsigned long mem_cgroup_get_all_zonestat(struct mem_cgroup *mem, | |
b69408e8 | 238 | enum lru_list idx) |
6d12e2d8 KH |
239 | { |
240 | int nid, zid; | |
241 | struct mem_cgroup_per_zone *mz; | |
242 | u64 total = 0; | |
243 | ||
244 | for_each_online_node(nid) | |
245 | for (zid = 0; zid < MAX_NR_ZONES; zid++) { | |
246 | mz = mem_cgroup_zoneinfo(mem, nid, zid); | |
247 | total += MEM_CGROUP_ZSTAT(mz, idx); | |
248 | } | |
249 | return total; | |
d52aa412 KH |
250 | } |
251 | ||
d5b69e38 | 252 | static struct mem_cgroup *mem_cgroup_from_cont(struct cgroup *cont) |
8cdea7c0 BS |
253 | { |
254 | return container_of(cgroup_subsys_state(cont, | |
255 | mem_cgroup_subsys_id), struct mem_cgroup, | |
256 | css); | |
257 | } | |
258 | ||
cf475ad2 | 259 | struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p) |
78fb7466 | 260 | { |
31a78f23 BS |
261 | /* |
262 | * mm_update_next_owner() may clear mm->owner to NULL | |
263 | * if it races with swapoff, page migration, etc. | |
264 | * So this can be called with p == NULL. | |
265 | */ | |
266 | if (unlikely(!p)) | |
267 | return NULL; | |
268 | ||
78fb7466 PE |
269 | return container_of(task_subsys_state(p, mem_cgroup_subsys_id), |
270 | struct mem_cgroup, css); | |
271 | } | |
272 | ||
08e552c6 KH |
273 | /* |
274 | * Following LRU functions are allowed to be used without PCG_LOCK. | |
275 | * Operations are called by routine of global LRU independently from memcg. | |
276 | * What we have to take care of here is validness of pc->mem_cgroup. | |
277 | * | |
278 | * Changes to pc->mem_cgroup happens when | |
279 | * 1. charge | |
280 | * 2. moving account | |
281 | * In typical case, "charge" is done before add-to-lru. Exception is SwapCache. | |
282 | * It is added to LRU before charge. | |
283 | * If PCG_USED bit is not set, page_cgroup is not added to this private LRU. | |
284 | * When moving account, the page is not on LRU. It's isolated. | |
285 | */ | |
4f98a2fe | 286 | |
08e552c6 KH |
287 | void mem_cgroup_del_lru_list(struct page *page, enum lru_list lru) |
288 | { | |
289 | struct page_cgroup *pc; | |
290 | struct mem_cgroup *mem; | |
291 | struct mem_cgroup_per_zone *mz; | |
6d12e2d8 | 292 | |
f8d66542 | 293 | if (mem_cgroup_disabled()) |
08e552c6 KH |
294 | return; |
295 | pc = lookup_page_cgroup(page); | |
296 | /* can happen while we handle swapcache. */ | |
297 | if (list_empty(&pc->lru)) | |
298 | return; | |
299 | mz = page_cgroup_zoneinfo(pc); | |
300 | mem = pc->mem_cgroup; | |
b69408e8 | 301 | MEM_CGROUP_ZSTAT(mz, lru) -= 1; |
08e552c6 KH |
302 | list_del_init(&pc->lru); |
303 | return; | |
6d12e2d8 KH |
304 | } |
305 | ||
08e552c6 | 306 | void mem_cgroup_del_lru(struct page *page) |
6d12e2d8 | 307 | { |
08e552c6 KH |
308 | mem_cgroup_del_lru_list(page, page_lru(page)); |
309 | } | |
b69408e8 | 310 | |
08e552c6 KH |
311 | void mem_cgroup_rotate_lru_list(struct page *page, enum lru_list lru) |
312 | { | |
313 | struct mem_cgroup_per_zone *mz; | |
314 | struct page_cgroup *pc; | |
b69408e8 | 315 | |
f8d66542 | 316 | if (mem_cgroup_disabled()) |
08e552c6 | 317 | return; |
6d12e2d8 | 318 | |
08e552c6 KH |
319 | pc = lookup_page_cgroup(page); |
320 | smp_rmb(); | |
321 | /* unused page is not rotated. */ | |
322 | if (!PageCgroupUsed(pc)) | |
323 | return; | |
324 | mz = page_cgroup_zoneinfo(pc); | |
325 | list_move(&pc->lru, &mz->lists[lru]); | |
6d12e2d8 KH |
326 | } |
327 | ||
08e552c6 | 328 | void mem_cgroup_add_lru_list(struct page *page, enum lru_list lru) |
66e1707b | 329 | { |
08e552c6 KH |
330 | struct page_cgroup *pc; |
331 | struct mem_cgroup_per_zone *mz; | |
6d12e2d8 | 332 | |
f8d66542 | 333 | if (mem_cgroup_disabled()) |
08e552c6 KH |
334 | return; |
335 | pc = lookup_page_cgroup(page); | |
336 | /* barrier to sync with "charge" */ | |
337 | smp_rmb(); | |
338 | if (!PageCgroupUsed(pc)) | |
894bc310 | 339 | return; |
b69408e8 | 340 | |
08e552c6 | 341 | mz = page_cgroup_zoneinfo(pc); |
b69408e8 | 342 | MEM_CGROUP_ZSTAT(mz, lru) += 1; |
08e552c6 KH |
343 | list_add(&pc->lru, &mz->lists[lru]); |
344 | } | |
345 | /* | |
346 | * To add swapcache into LRU. Be careful to all this function. | |
347 | * zone->lru_lock shouldn't be held and irq must not be disabled. | |
348 | */ | |
349 | static void mem_cgroup_lru_fixup(struct page *page) | |
350 | { | |
351 | if (!isolate_lru_page(page)) | |
352 | putback_lru_page(page); | |
353 | } | |
354 | ||
355 | void mem_cgroup_move_lists(struct page *page, | |
356 | enum lru_list from, enum lru_list to) | |
357 | { | |
f8d66542 | 358 | if (mem_cgroup_disabled()) |
08e552c6 KH |
359 | return; |
360 | mem_cgroup_del_lru_list(page, from); | |
361 | mem_cgroup_add_lru_list(page, to); | |
66e1707b BS |
362 | } |
363 | ||
4c4a2214 DR |
364 | int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem) |
365 | { | |
366 | int ret; | |
367 | ||
368 | task_lock(task); | |
bd845e38 | 369 | ret = task->mm && mm_match_cgroup(task->mm, mem); |
4c4a2214 DR |
370 | task_unlock(task); |
371 | return ret; | |
372 | } | |
373 | ||
58ae83db KH |
374 | /* |
375 | * Calculate mapped_ratio under memory controller. This will be used in | |
376 | * vmscan.c for deteremining we have to reclaim mapped pages. | |
377 | */ | |
378 | int mem_cgroup_calc_mapped_ratio(struct mem_cgroup *mem) | |
379 | { | |
380 | long total, rss; | |
381 | ||
382 | /* | |
383 | * usage is recorded in bytes. But, here, we assume the number of | |
384 | * physical pages can be represented by "long" on any arch. | |
385 | */ | |
386 | total = (long) (mem->res.usage >> PAGE_SHIFT) + 1L; | |
387 | rss = (long)mem_cgroup_read_stat(&mem->stat, MEM_CGROUP_STAT_RSS); | |
388 | return (int)((rss * 100L) / total); | |
389 | } | |
8869b8f6 | 390 | |
6c48a1d0 KH |
391 | /* |
392 | * prev_priority control...this will be used in memory reclaim path. | |
393 | */ | |
394 | int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem) | |
395 | { | |
396 | return mem->prev_priority; | |
397 | } | |
398 | ||
399 | void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem, int priority) | |
400 | { | |
401 | if (priority < mem->prev_priority) | |
402 | mem->prev_priority = priority; | |
403 | } | |
404 | ||
405 | void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem, int priority) | |
406 | { | |
407 | mem->prev_priority = priority; | |
408 | } | |
409 | ||
cc38108e KH |
410 | /* |
411 | * Calculate # of pages to be scanned in this priority/zone. | |
412 | * See also vmscan.c | |
413 | * | |
414 | * priority starts from "DEF_PRIORITY" and decremented in each loop. | |
415 | * (see include/linux/mmzone.h) | |
416 | */ | |
417 | ||
b69408e8 CL |
418 | long mem_cgroup_calc_reclaim(struct mem_cgroup *mem, struct zone *zone, |
419 | int priority, enum lru_list lru) | |
cc38108e | 420 | { |
b69408e8 | 421 | long nr_pages; |
cc38108e KH |
422 | int nid = zone->zone_pgdat->node_id; |
423 | int zid = zone_idx(zone); | |
424 | struct mem_cgroup_per_zone *mz = mem_cgroup_zoneinfo(mem, nid, zid); | |
425 | ||
b69408e8 | 426 | nr_pages = MEM_CGROUP_ZSTAT(mz, lru); |
cc38108e | 427 | |
b69408e8 | 428 | return (nr_pages >> priority); |
cc38108e KH |
429 | } |
430 | ||
66e1707b BS |
431 | unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan, |
432 | struct list_head *dst, | |
433 | unsigned long *scanned, int order, | |
434 | int mode, struct zone *z, | |
435 | struct mem_cgroup *mem_cont, | |
4f98a2fe | 436 | int active, int file) |
66e1707b BS |
437 | { |
438 | unsigned long nr_taken = 0; | |
439 | struct page *page; | |
440 | unsigned long scan; | |
441 | LIST_HEAD(pc_list); | |
442 | struct list_head *src; | |
ff7283fa | 443 | struct page_cgroup *pc, *tmp; |
1ecaab2b KH |
444 | int nid = z->zone_pgdat->node_id; |
445 | int zid = zone_idx(z); | |
446 | struct mem_cgroup_per_zone *mz; | |
4f98a2fe | 447 | int lru = LRU_FILE * !!file + !!active; |
66e1707b | 448 | |
cf475ad2 | 449 | BUG_ON(!mem_cont); |
1ecaab2b | 450 | mz = mem_cgroup_zoneinfo(mem_cont, nid, zid); |
b69408e8 | 451 | src = &mz->lists[lru]; |
66e1707b | 452 | |
ff7283fa KH |
453 | scan = 0; |
454 | list_for_each_entry_safe_reverse(pc, tmp, src, lru) { | |
436c6541 | 455 | if (scan >= nr_to_scan) |
ff7283fa | 456 | break; |
08e552c6 KH |
457 | |
458 | page = pc->page; | |
52d4b9ac KH |
459 | if (unlikely(!PageCgroupUsed(pc))) |
460 | continue; | |
436c6541 | 461 | if (unlikely(!PageLRU(page))) |
ff7283fa | 462 | continue; |
ff7283fa | 463 | |
436c6541 | 464 | scan++; |
4f98a2fe | 465 | if (__isolate_lru_page(page, mode, file) == 0) { |
66e1707b BS |
466 | list_move(&page->lru, dst); |
467 | nr_taken++; | |
468 | } | |
469 | } | |
470 | ||
66e1707b BS |
471 | *scanned = scan; |
472 | return nr_taken; | |
473 | } | |
474 | ||
6d61ef40 BS |
475 | #define mem_cgroup_from_res_counter(counter, member) \ |
476 | container_of(counter, struct mem_cgroup, member) | |
477 | ||
478 | /* | |
479 | * This routine finds the DFS walk successor. This routine should be | |
480 | * called with cgroup_mutex held | |
481 | */ | |
482 | static struct mem_cgroup * | |
483 | mem_cgroup_get_next_node(struct mem_cgroup *curr, struct mem_cgroup *root_mem) | |
484 | { | |
485 | struct cgroup *cgroup, *curr_cgroup, *root_cgroup; | |
486 | ||
487 | curr_cgroup = curr->css.cgroup; | |
488 | root_cgroup = root_mem->css.cgroup; | |
489 | ||
490 | if (!list_empty(&curr_cgroup->children)) { | |
491 | /* | |
492 | * Walk down to children | |
493 | */ | |
494 | mem_cgroup_put(curr); | |
495 | cgroup = list_entry(curr_cgroup->children.next, | |
496 | struct cgroup, sibling); | |
497 | curr = mem_cgroup_from_cont(cgroup); | |
498 | mem_cgroup_get(curr); | |
499 | goto done; | |
500 | } | |
501 | ||
502 | visit_parent: | |
503 | if (curr_cgroup == root_cgroup) { | |
504 | mem_cgroup_put(curr); | |
505 | curr = root_mem; | |
506 | mem_cgroup_get(curr); | |
507 | goto done; | |
508 | } | |
509 | ||
510 | /* | |
511 | * Goto next sibling | |
512 | */ | |
513 | if (curr_cgroup->sibling.next != &curr_cgroup->parent->children) { | |
514 | mem_cgroup_put(curr); | |
515 | cgroup = list_entry(curr_cgroup->sibling.next, struct cgroup, | |
516 | sibling); | |
517 | curr = mem_cgroup_from_cont(cgroup); | |
518 | mem_cgroup_get(curr); | |
519 | goto done; | |
520 | } | |
521 | ||
522 | /* | |
523 | * Go up to next parent and next parent's sibling if need be | |
524 | */ | |
525 | curr_cgroup = curr_cgroup->parent; | |
526 | goto visit_parent; | |
527 | ||
528 | done: | |
529 | root_mem->last_scanned_child = curr; | |
530 | return curr; | |
531 | } | |
532 | ||
533 | /* | |
534 | * Visit the first child (need not be the first child as per the ordering | |
535 | * of the cgroup list, since we track last_scanned_child) of @mem and use | |
536 | * that to reclaim free pages from. | |
537 | */ | |
538 | static struct mem_cgroup * | |
539 | mem_cgroup_get_first_node(struct mem_cgroup *root_mem) | |
540 | { | |
541 | struct cgroup *cgroup; | |
542 | struct mem_cgroup *ret; | |
543 | bool obsolete = (root_mem->last_scanned_child && | |
544 | root_mem->last_scanned_child->obsolete); | |
545 | ||
546 | /* | |
547 | * Scan all children under the mem_cgroup mem | |
548 | */ | |
549 | cgroup_lock(); | |
550 | if (list_empty(&root_mem->css.cgroup->children)) { | |
551 | ret = root_mem; | |
552 | goto done; | |
553 | } | |
554 | ||
555 | if (!root_mem->last_scanned_child || obsolete) { | |
556 | ||
557 | if (obsolete) | |
558 | mem_cgroup_put(root_mem->last_scanned_child); | |
559 | ||
560 | cgroup = list_first_entry(&root_mem->css.cgroup->children, | |
561 | struct cgroup, sibling); | |
562 | ret = mem_cgroup_from_cont(cgroup); | |
563 | mem_cgroup_get(ret); | |
564 | } else | |
565 | ret = mem_cgroup_get_next_node(root_mem->last_scanned_child, | |
566 | root_mem); | |
567 | ||
568 | done: | |
569 | root_mem->last_scanned_child = ret; | |
570 | cgroup_unlock(); | |
571 | return ret; | |
572 | } | |
573 | ||
574 | /* | |
575 | * Dance down the hierarchy if needed to reclaim memory. We remember the | |
576 | * last child we reclaimed from, so that we don't end up penalizing | |
577 | * one child extensively based on its position in the children list. | |
578 | * | |
579 | * root_mem is the original ancestor that we've been reclaim from. | |
580 | */ | |
581 | static int mem_cgroup_hierarchical_reclaim(struct mem_cgroup *root_mem, | |
582 | gfp_t gfp_mask, bool noswap) | |
583 | { | |
584 | struct mem_cgroup *next_mem; | |
585 | int ret = 0; | |
586 | ||
587 | /* | |
588 | * Reclaim unconditionally and don't check for return value. | |
589 | * We need to reclaim in the current group and down the tree. | |
590 | * One might think about checking for children before reclaiming, | |
591 | * but there might be left over accounting, even after children | |
592 | * have left. | |
593 | */ | |
594 | ret = try_to_free_mem_cgroup_pages(root_mem, gfp_mask, noswap); | |
595 | if (res_counter_check_under_limit(&root_mem->res)) | |
596 | return 0; | |
597 | ||
598 | next_mem = mem_cgroup_get_first_node(root_mem); | |
599 | ||
600 | while (next_mem != root_mem) { | |
601 | if (next_mem->obsolete) { | |
602 | mem_cgroup_put(next_mem); | |
603 | cgroup_lock(); | |
604 | next_mem = mem_cgroup_get_first_node(root_mem); | |
605 | cgroup_unlock(); | |
606 | continue; | |
607 | } | |
608 | ret = try_to_free_mem_cgroup_pages(next_mem, gfp_mask, noswap); | |
609 | if (res_counter_check_under_limit(&root_mem->res)) | |
610 | return 0; | |
611 | cgroup_lock(); | |
612 | next_mem = mem_cgroup_get_next_node(next_mem, root_mem); | |
613 | cgroup_unlock(); | |
614 | } | |
615 | return ret; | |
616 | } | |
617 | ||
a636b327 KH |
618 | bool mem_cgroup_oom_called(struct task_struct *task) |
619 | { | |
620 | bool ret = false; | |
621 | struct mem_cgroup *mem; | |
622 | struct mm_struct *mm; | |
623 | ||
624 | rcu_read_lock(); | |
625 | mm = task->mm; | |
626 | if (!mm) | |
627 | mm = &init_mm; | |
628 | mem = mem_cgroup_from_task(rcu_dereference(mm->owner)); | |
629 | if (mem && time_before(jiffies, mem->last_oom_jiffies + HZ/10)) | |
630 | ret = true; | |
631 | rcu_read_unlock(); | |
632 | return ret; | |
633 | } | |
f817ed48 KH |
634 | /* |
635 | * Unlike exported interface, "oom" parameter is added. if oom==true, | |
636 | * oom-killer can be invoked. | |
8a9f3ccd | 637 | */ |
f817ed48 | 638 | static int __mem_cgroup_try_charge(struct mm_struct *mm, |
8c7c6e34 KH |
639 | gfp_t gfp_mask, struct mem_cgroup **memcg, |
640 | bool oom) | |
8a9f3ccd | 641 | { |
6d61ef40 | 642 | struct mem_cgroup *mem, *mem_over_limit; |
7a81b88c | 643 | int nr_retries = MEM_CGROUP_RECLAIM_RETRIES; |
28dbc4b6 | 644 | struct res_counter *fail_res; |
a636b327 KH |
645 | |
646 | if (unlikely(test_thread_flag(TIF_MEMDIE))) { | |
647 | /* Don't account this! */ | |
648 | *memcg = NULL; | |
649 | return 0; | |
650 | } | |
651 | ||
8a9f3ccd | 652 | /* |
3be91277 HD |
653 | * We always charge the cgroup the mm_struct belongs to. |
654 | * The mm_struct's mem_cgroup changes on task migration if the | |
8a9f3ccd BS |
655 | * thread group leader migrates. It's possible that mm is not |
656 | * set, if so charge the init_mm (happens for pagecache usage). | |
657 | */ | |
7a81b88c | 658 | if (likely(!*memcg)) { |
e8589cc1 KH |
659 | rcu_read_lock(); |
660 | mem = mem_cgroup_from_task(rcu_dereference(mm->owner)); | |
31a78f23 BS |
661 | if (unlikely(!mem)) { |
662 | rcu_read_unlock(); | |
31a78f23 BS |
663 | return 0; |
664 | } | |
e8589cc1 KH |
665 | /* |
666 | * For every charge from the cgroup, increment reference count | |
667 | */ | |
668 | css_get(&mem->css); | |
7a81b88c | 669 | *memcg = mem; |
e8589cc1 KH |
670 | rcu_read_unlock(); |
671 | } else { | |
7a81b88c KH |
672 | mem = *memcg; |
673 | css_get(&mem->css); | |
e8589cc1 | 674 | } |
8a9f3ccd | 675 | |
8c7c6e34 KH |
676 | while (1) { |
677 | int ret; | |
678 | bool noswap = false; | |
7a81b88c | 679 | |
28dbc4b6 | 680 | ret = res_counter_charge(&mem->res, PAGE_SIZE, &fail_res); |
8c7c6e34 KH |
681 | if (likely(!ret)) { |
682 | if (!do_swap_account) | |
683 | break; | |
28dbc4b6 BS |
684 | ret = res_counter_charge(&mem->memsw, PAGE_SIZE, |
685 | &fail_res); | |
8c7c6e34 KH |
686 | if (likely(!ret)) |
687 | break; | |
688 | /* mem+swap counter fails */ | |
689 | res_counter_uncharge(&mem->res, PAGE_SIZE); | |
690 | noswap = true; | |
6d61ef40 BS |
691 | mem_over_limit = mem_cgroup_from_res_counter(fail_res, |
692 | memsw); | |
693 | } else | |
694 | /* mem counter fails */ | |
695 | mem_over_limit = mem_cgroup_from_res_counter(fail_res, | |
696 | res); | |
697 | ||
3be91277 | 698 | if (!(gfp_mask & __GFP_WAIT)) |
7a81b88c | 699 | goto nomem; |
e1a1cd59 | 700 | |
6d61ef40 BS |
701 | ret = mem_cgroup_hierarchical_reclaim(mem_over_limit, gfp_mask, |
702 | noswap); | |
66e1707b BS |
703 | |
704 | /* | |
8869b8f6 HD |
705 | * try_to_free_mem_cgroup_pages() might not give us a full |
706 | * picture of reclaim. Some pages are reclaimed and might be | |
707 | * moved to swap cache or just unmapped from the cgroup. | |
708 | * Check the limit again to see if the reclaim reduced the | |
709 | * current usage of the cgroup before giving up | |
8c7c6e34 | 710 | * |
8869b8f6 | 711 | */ |
88700756 KH |
712 | if (do_swap_account) { |
713 | if (res_counter_check_under_limit(&mem_over_limit->res) && | |
714 | res_counter_check_under_limit(&mem_over_limit->memsw)) | |
715 | continue; | |
716 | } else if (res_counter_check_under_limit(&mem_over_limit->res)) | |
717 | continue; | |
3be91277 HD |
718 | |
719 | if (!nr_retries--) { | |
a636b327 | 720 | if (oom) { |
88700756 KH |
721 | mem_cgroup_out_of_memory(mem_over_limit, gfp_mask); |
722 | mem_over_limit->last_oom_jiffies = jiffies; | |
a636b327 | 723 | } |
7a81b88c | 724 | goto nomem; |
66e1707b | 725 | } |
8a9f3ccd | 726 | } |
7a81b88c KH |
727 | return 0; |
728 | nomem: | |
729 | css_put(&mem->css); | |
730 | return -ENOMEM; | |
731 | } | |
8a9f3ccd | 732 | |
f817ed48 KH |
733 | /** |
734 | * mem_cgroup_try_charge - get charge of PAGE_SIZE. | |
735 | * @mm: an mm_struct which is charged against. (when *memcg is NULL) | |
736 | * @gfp_mask: gfp_mask for reclaim. | |
737 | * @memcg: a pointer to memory cgroup which is charged against. | |
738 | * | |
739 | * charge against memory cgroup pointed by *memcg. if *memcg == NULL, estimated | |
740 | * memory cgroup from @mm is got and stored in *memcg. | |
741 | * | |
742 | * Returns 0 if success. -ENOMEM at failure. | |
743 | * This call can invoke OOM-Killer. | |
744 | */ | |
745 | ||
746 | int mem_cgroup_try_charge(struct mm_struct *mm, | |
747 | gfp_t mask, struct mem_cgroup **memcg) | |
748 | { | |
749 | return __mem_cgroup_try_charge(mm, mask, memcg, true); | |
750 | } | |
751 | ||
7a81b88c KH |
752 | /* |
753 | * commit a charge got by mem_cgroup_try_charge() and makes page_cgroup to be | |
754 | * USED state. If already USED, uncharge and return. | |
755 | */ | |
756 | ||
757 | static void __mem_cgroup_commit_charge(struct mem_cgroup *mem, | |
758 | struct page_cgroup *pc, | |
759 | enum charge_type ctype) | |
760 | { | |
7a81b88c KH |
761 | /* try_charge() can return NULL to *memcg, taking care of it. */ |
762 | if (!mem) | |
763 | return; | |
52d4b9ac KH |
764 | |
765 | lock_page_cgroup(pc); | |
766 | if (unlikely(PageCgroupUsed(pc))) { | |
767 | unlock_page_cgroup(pc); | |
768 | res_counter_uncharge(&mem->res, PAGE_SIZE); | |
8c7c6e34 KH |
769 | if (do_swap_account) |
770 | res_counter_uncharge(&mem->memsw, PAGE_SIZE); | |
52d4b9ac | 771 | css_put(&mem->css); |
7a81b88c | 772 | return; |
52d4b9ac | 773 | } |
8a9f3ccd | 774 | pc->mem_cgroup = mem; |
08e552c6 | 775 | smp_wmb(); |
c05555b5 | 776 | pc->flags = pcg_default_flags[ctype]; |
3be91277 | 777 | |
08e552c6 | 778 | mem_cgroup_charge_statistics(mem, pc, true); |
52d4b9ac | 779 | |
52d4b9ac | 780 | unlock_page_cgroup(pc); |
7a81b88c | 781 | } |
66e1707b | 782 | |
f817ed48 KH |
783 | /** |
784 | * mem_cgroup_move_account - move account of the page | |
785 | * @pc: page_cgroup of the page. | |
786 | * @from: mem_cgroup which the page is moved from. | |
787 | * @to: mem_cgroup which the page is moved to. @from != @to. | |
788 | * | |
789 | * The caller must confirm following. | |
08e552c6 | 790 | * - page is not on LRU (isolate_page() is useful.) |
f817ed48 KH |
791 | * |
792 | * returns 0 at success, | |
793 | * returns -EBUSY when lock is busy or "pc" is unstable. | |
794 | * | |
795 | * This function does "uncharge" from old cgroup but doesn't do "charge" to | |
796 | * new cgroup. It should be done by a caller. | |
797 | */ | |
798 | ||
799 | static int mem_cgroup_move_account(struct page_cgroup *pc, | |
800 | struct mem_cgroup *from, struct mem_cgroup *to) | |
801 | { | |
802 | struct mem_cgroup_per_zone *from_mz, *to_mz; | |
803 | int nid, zid; | |
804 | int ret = -EBUSY; | |
805 | ||
f817ed48 | 806 | VM_BUG_ON(from == to); |
08e552c6 | 807 | VM_BUG_ON(PageLRU(pc->page)); |
f817ed48 KH |
808 | |
809 | nid = page_cgroup_nid(pc); | |
810 | zid = page_cgroup_zid(pc); | |
811 | from_mz = mem_cgroup_zoneinfo(from, nid, zid); | |
812 | to_mz = mem_cgroup_zoneinfo(to, nid, zid); | |
813 | ||
f817ed48 KH |
814 | if (!trylock_page_cgroup(pc)) |
815 | return ret; | |
816 | ||
817 | if (!PageCgroupUsed(pc)) | |
818 | goto out; | |
819 | ||
820 | if (pc->mem_cgroup != from) | |
821 | goto out; | |
822 | ||
08e552c6 KH |
823 | css_put(&from->css); |
824 | res_counter_uncharge(&from->res, PAGE_SIZE); | |
825 | mem_cgroup_charge_statistics(from, pc, false); | |
826 | if (do_swap_account) | |
827 | res_counter_uncharge(&from->memsw, PAGE_SIZE); | |
828 | pc->mem_cgroup = to; | |
829 | mem_cgroup_charge_statistics(to, pc, true); | |
830 | css_get(&to->css); | |
831 | ret = 0; | |
f817ed48 KH |
832 | out: |
833 | unlock_page_cgroup(pc); | |
834 | return ret; | |
835 | } | |
836 | ||
837 | /* | |
838 | * move charges to its parent. | |
839 | */ | |
840 | ||
841 | static int mem_cgroup_move_parent(struct page_cgroup *pc, | |
842 | struct mem_cgroup *child, | |
843 | gfp_t gfp_mask) | |
844 | { | |
08e552c6 | 845 | struct page *page = pc->page; |
f817ed48 KH |
846 | struct cgroup *cg = child->css.cgroup; |
847 | struct cgroup *pcg = cg->parent; | |
848 | struct mem_cgroup *parent; | |
f817ed48 KH |
849 | int ret; |
850 | ||
851 | /* Is ROOT ? */ | |
852 | if (!pcg) | |
853 | return -EINVAL; | |
854 | ||
08e552c6 | 855 | |
f817ed48 KH |
856 | parent = mem_cgroup_from_cont(pcg); |
857 | ||
08e552c6 | 858 | |
f817ed48 | 859 | ret = __mem_cgroup_try_charge(NULL, gfp_mask, &parent, false); |
a636b327 | 860 | if (ret || !parent) |
f817ed48 KH |
861 | return ret; |
862 | ||
08e552c6 KH |
863 | if (!get_page_unless_zero(page)) |
864 | return -EBUSY; | |
865 | ||
866 | ret = isolate_lru_page(page); | |
867 | ||
868 | if (ret) | |
869 | goto cancel; | |
f817ed48 | 870 | |
f817ed48 | 871 | ret = mem_cgroup_move_account(pc, child, parent); |
f817ed48 | 872 | |
08e552c6 | 873 | /* drop extra refcnt by try_charge() (move_account increment one) */ |
f817ed48 | 874 | css_put(&parent->css); |
08e552c6 KH |
875 | putback_lru_page(page); |
876 | if (!ret) { | |
877 | put_page(page); | |
878 | return 0; | |
8c7c6e34 | 879 | } |
08e552c6 KH |
880 | /* uncharge if move fails */ |
881 | cancel: | |
882 | res_counter_uncharge(&parent->res, PAGE_SIZE); | |
883 | if (do_swap_account) | |
884 | res_counter_uncharge(&parent->memsw, PAGE_SIZE); | |
885 | put_page(page); | |
f817ed48 KH |
886 | return ret; |
887 | } | |
888 | ||
7a81b88c KH |
889 | /* |
890 | * Charge the memory controller for page usage. | |
891 | * Return | |
892 | * 0 if the charge was successful | |
893 | * < 0 if the cgroup is over its limit | |
894 | */ | |
895 | static int mem_cgroup_charge_common(struct page *page, struct mm_struct *mm, | |
896 | gfp_t gfp_mask, enum charge_type ctype, | |
897 | struct mem_cgroup *memcg) | |
898 | { | |
899 | struct mem_cgroup *mem; | |
900 | struct page_cgroup *pc; | |
901 | int ret; | |
902 | ||
903 | pc = lookup_page_cgroup(page); | |
904 | /* can happen at boot */ | |
905 | if (unlikely(!pc)) | |
906 | return 0; | |
907 | prefetchw(pc); | |
908 | ||
909 | mem = memcg; | |
f817ed48 | 910 | ret = __mem_cgroup_try_charge(mm, gfp_mask, &mem, true); |
a636b327 | 911 | if (ret || !mem) |
7a81b88c KH |
912 | return ret; |
913 | ||
914 | __mem_cgroup_commit_charge(mem, pc, ctype); | |
8a9f3ccd | 915 | return 0; |
8a9f3ccd BS |
916 | } |
917 | ||
7a81b88c KH |
918 | int mem_cgroup_newpage_charge(struct page *page, |
919 | struct mm_struct *mm, gfp_t gfp_mask) | |
217bc319 | 920 | { |
f8d66542 | 921 | if (mem_cgroup_disabled()) |
cede86ac | 922 | return 0; |
52d4b9ac KH |
923 | if (PageCompound(page)) |
924 | return 0; | |
69029cd5 KH |
925 | /* |
926 | * If already mapped, we don't have to account. | |
927 | * If page cache, page->mapping has address_space. | |
928 | * But page->mapping may have out-of-use anon_vma pointer, | |
929 | * detecit it by PageAnon() check. newly-mapped-anon's page->mapping | |
930 | * is NULL. | |
931 | */ | |
932 | if (page_mapped(page) || (page->mapping && !PageAnon(page))) | |
933 | return 0; | |
934 | if (unlikely(!mm)) | |
935 | mm = &init_mm; | |
217bc319 | 936 | return mem_cgroup_charge_common(page, mm, gfp_mask, |
e8589cc1 | 937 | MEM_CGROUP_CHARGE_TYPE_MAPPED, NULL); |
217bc319 KH |
938 | } |
939 | ||
e1a1cd59 BS |
940 | int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm, |
941 | gfp_t gfp_mask) | |
8697d331 | 942 | { |
f8d66542 | 943 | if (mem_cgroup_disabled()) |
cede86ac | 944 | return 0; |
52d4b9ac KH |
945 | if (PageCompound(page)) |
946 | return 0; | |
accf163e KH |
947 | /* |
948 | * Corner case handling. This is called from add_to_page_cache() | |
949 | * in usual. But some FS (shmem) precharges this page before calling it | |
950 | * and call add_to_page_cache() with GFP_NOWAIT. | |
951 | * | |
952 | * For GFP_NOWAIT case, the page may be pre-charged before calling | |
953 | * add_to_page_cache(). (See shmem.c) check it here and avoid to call | |
954 | * charge twice. (It works but has to pay a bit larger cost.) | |
955 | */ | |
956 | if (!(gfp_mask & __GFP_WAIT)) { | |
957 | struct page_cgroup *pc; | |
958 | ||
52d4b9ac KH |
959 | |
960 | pc = lookup_page_cgroup(page); | |
961 | if (!pc) | |
962 | return 0; | |
963 | lock_page_cgroup(pc); | |
964 | if (PageCgroupUsed(pc)) { | |
965 | unlock_page_cgroup(pc); | |
accf163e KH |
966 | return 0; |
967 | } | |
52d4b9ac | 968 | unlock_page_cgroup(pc); |
accf163e KH |
969 | } |
970 | ||
69029cd5 | 971 | if (unlikely(!mm)) |
8697d331 | 972 | mm = &init_mm; |
accf163e | 973 | |
c05555b5 KH |
974 | if (page_is_file_cache(page)) |
975 | return mem_cgroup_charge_common(page, mm, gfp_mask, | |
e8589cc1 | 976 | MEM_CGROUP_CHARGE_TYPE_CACHE, NULL); |
c05555b5 KH |
977 | else |
978 | return mem_cgroup_charge_common(page, mm, gfp_mask, | |
979 | MEM_CGROUP_CHARGE_TYPE_SHMEM, NULL); | |
e8589cc1 KH |
980 | } |
981 | ||
8c7c6e34 KH |
982 | int mem_cgroup_try_charge_swapin(struct mm_struct *mm, |
983 | struct page *page, | |
984 | gfp_t mask, struct mem_cgroup **ptr) | |
985 | { | |
986 | struct mem_cgroup *mem; | |
987 | swp_entry_t ent; | |
988 | ||
f8d66542 | 989 | if (mem_cgroup_disabled()) |
8c7c6e34 KH |
990 | return 0; |
991 | ||
992 | if (!do_swap_account) | |
993 | goto charge_cur_mm; | |
994 | ||
995 | /* | |
996 | * A racing thread's fault, or swapoff, may have already updated | |
997 | * the pte, and even removed page from swap cache: return success | |
998 | * to go on to do_swap_page()'s pte_same() test, which should fail. | |
999 | */ | |
1000 | if (!PageSwapCache(page)) | |
1001 | return 0; | |
1002 | ||
1003 | ent.val = page_private(page); | |
1004 | ||
1005 | mem = lookup_swap_cgroup(ent); | |
1006 | if (!mem || mem->obsolete) | |
1007 | goto charge_cur_mm; | |
1008 | *ptr = mem; | |
1009 | return __mem_cgroup_try_charge(NULL, mask, ptr, true); | |
1010 | charge_cur_mm: | |
1011 | if (unlikely(!mm)) | |
1012 | mm = &init_mm; | |
1013 | return __mem_cgroup_try_charge(mm, mask, ptr, true); | |
1014 | } | |
1015 | ||
d13d1443 | 1016 | #ifdef CONFIG_SWAP |
8c7c6e34 | 1017 | |
d13d1443 KH |
1018 | int mem_cgroup_cache_charge_swapin(struct page *page, |
1019 | struct mm_struct *mm, gfp_t mask, bool locked) | |
1020 | { | |
1021 | int ret = 0; | |
1022 | ||
f8d66542 | 1023 | if (mem_cgroup_disabled()) |
d13d1443 KH |
1024 | return 0; |
1025 | if (unlikely(!mm)) | |
1026 | mm = &init_mm; | |
1027 | if (!locked) | |
1028 | lock_page(page); | |
1029 | /* | |
1030 | * If not locked, the page can be dropped from SwapCache until | |
1031 | * we reach here. | |
1032 | */ | |
1033 | if (PageSwapCache(page)) { | |
8c7c6e34 KH |
1034 | struct mem_cgroup *mem = NULL; |
1035 | swp_entry_t ent; | |
1036 | ||
1037 | ent.val = page_private(page); | |
1038 | if (do_swap_account) { | |
1039 | mem = lookup_swap_cgroup(ent); | |
1040 | if (mem && mem->obsolete) | |
1041 | mem = NULL; | |
1042 | if (mem) | |
1043 | mm = NULL; | |
1044 | } | |
d13d1443 | 1045 | ret = mem_cgroup_charge_common(page, mm, mask, |
8c7c6e34 KH |
1046 | MEM_CGROUP_CHARGE_TYPE_SHMEM, mem); |
1047 | ||
1048 | if (!ret && do_swap_account) { | |
1049 | /* avoid double counting */ | |
1050 | mem = swap_cgroup_record(ent, NULL); | |
1051 | if (mem) { | |
1052 | res_counter_uncharge(&mem->memsw, PAGE_SIZE); | |
1053 | mem_cgroup_put(mem); | |
1054 | } | |
1055 | } | |
d13d1443 KH |
1056 | } |
1057 | if (!locked) | |
1058 | unlock_page(page); | |
08e552c6 KH |
1059 | /* add this page(page_cgroup) to the LRU we want. */ |
1060 | mem_cgroup_lru_fixup(page); | |
d13d1443 KH |
1061 | |
1062 | return ret; | |
1063 | } | |
1064 | #endif | |
1065 | ||
7a81b88c KH |
1066 | void mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *ptr) |
1067 | { | |
1068 | struct page_cgroup *pc; | |
1069 | ||
f8d66542 | 1070 | if (mem_cgroup_disabled()) |
7a81b88c KH |
1071 | return; |
1072 | if (!ptr) | |
1073 | return; | |
1074 | pc = lookup_page_cgroup(page); | |
1075 | __mem_cgroup_commit_charge(ptr, pc, MEM_CGROUP_CHARGE_TYPE_MAPPED); | |
8c7c6e34 KH |
1076 | /* |
1077 | * Now swap is on-memory. This means this page may be | |
1078 | * counted both as mem and swap....double count. | |
1079 | * Fix it by uncharging from memsw. This SwapCache is stable | |
1080 | * because we're still under lock_page(). | |
1081 | */ | |
1082 | if (do_swap_account) { | |
1083 | swp_entry_t ent = {.val = page_private(page)}; | |
1084 | struct mem_cgroup *memcg; | |
1085 | memcg = swap_cgroup_record(ent, NULL); | |
1086 | if (memcg) { | |
1087 | /* If memcg is obsolete, memcg can be != ptr */ | |
1088 | res_counter_uncharge(&memcg->memsw, PAGE_SIZE); | |
1089 | mem_cgroup_put(memcg); | |
1090 | } | |
1091 | ||
1092 | } | |
08e552c6 KH |
1093 | /* add this page(page_cgroup) to the LRU we want. */ |
1094 | mem_cgroup_lru_fixup(page); | |
7a81b88c KH |
1095 | } |
1096 | ||
1097 | void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *mem) | |
1098 | { | |
f8d66542 | 1099 | if (mem_cgroup_disabled()) |
7a81b88c KH |
1100 | return; |
1101 | if (!mem) | |
1102 | return; | |
1103 | res_counter_uncharge(&mem->res, PAGE_SIZE); | |
8c7c6e34 KH |
1104 | if (do_swap_account) |
1105 | res_counter_uncharge(&mem->memsw, PAGE_SIZE); | |
7a81b88c KH |
1106 | css_put(&mem->css); |
1107 | } | |
1108 | ||
1109 | ||
8a9f3ccd | 1110 | /* |
69029cd5 | 1111 | * uncharge if !page_mapped(page) |
8a9f3ccd | 1112 | */ |
8c7c6e34 | 1113 | static struct mem_cgroup * |
69029cd5 | 1114 | __mem_cgroup_uncharge_common(struct page *page, enum charge_type ctype) |
8a9f3ccd | 1115 | { |
8289546e | 1116 | struct page_cgroup *pc; |
8c7c6e34 | 1117 | struct mem_cgroup *mem = NULL; |
072c56c1 | 1118 | struct mem_cgroup_per_zone *mz; |
8a9f3ccd | 1119 | |
f8d66542 | 1120 | if (mem_cgroup_disabled()) |
8c7c6e34 | 1121 | return NULL; |
4077960e | 1122 | |
d13d1443 | 1123 | if (PageSwapCache(page)) |
8c7c6e34 | 1124 | return NULL; |
d13d1443 | 1125 | |
8697d331 | 1126 | /* |
3c541e14 | 1127 | * Check if our page_cgroup is valid |
8697d331 | 1128 | */ |
52d4b9ac KH |
1129 | pc = lookup_page_cgroup(page); |
1130 | if (unlikely(!pc || !PageCgroupUsed(pc))) | |
8c7c6e34 | 1131 | return NULL; |
b9c565d5 | 1132 | |
52d4b9ac | 1133 | lock_page_cgroup(pc); |
d13d1443 | 1134 | |
8c7c6e34 KH |
1135 | mem = pc->mem_cgroup; |
1136 | ||
d13d1443 KH |
1137 | if (!PageCgroupUsed(pc)) |
1138 | goto unlock_out; | |
1139 | ||
1140 | switch (ctype) { | |
1141 | case MEM_CGROUP_CHARGE_TYPE_MAPPED: | |
1142 | if (page_mapped(page)) | |
1143 | goto unlock_out; | |
1144 | break; | |
1145 | case MEM_CGROUP_CHARGE_TYPE_SWAPOUT: | |
1146 | if (!PageAnon(page)) { /* Shared memory */ | |
1147 | if (page->mapping && !page_is_file_cache(page)) | |
1148 | goto unlock_out; | |
1149 | } else if (page_mapped(page)) /* Anon */ | |
1150 | goto unlock_out; | |
1151 | break; | |
1152 | default: | |
1153 | break; | |
52d4b9ac | 1154 | } |
d13d1443 | 1155 | |
8c7c6e34 KH |
1156 | res_counter_uncharge(&mem->res, PAGE_SIZE); |
1157 | if (do_swap_account && (ctype != MEM_CGROUP_CHARGE_TYPE_SWAPOUT)) | |
1158 | res_counter_uncharge(&mem->memsw, PAGE_SIZE); | |
1159 | ||
08e552c6 | 1160 | mem_cgroup_charge_statistics(mem, pc, false); |
52d4b9ac | 1161 | ClearPageCgroupUsed(pc); |
b9c565d5 | 1162 | |
69029cd5 | 1163 | mz = page_cgroup_zoneinfo(pc); |
52d4b9ac | 1164 | unlock_page_cgroup(pc); |
fb59e9f1 | 1165 | |
69029cd5 | 1166 | css_put(&mem->css); |
6d12e2d8 | 1167 | |
8c7c6e34 | 1168 | return mem; |
d13d1443 KH |
1169 | |
1170 | unlock_out: | |
1171 | unlock_page_cgroup(pc); | |
8c7c6e34 | 1172 | return NULL; |
3c541e14 BS |
1173 | } |
1174 | ||
69029cd5 KH |
1175 | void mem_cgroup_uncharge_page(struct page *page) |
1176 | { | |
52d4b9ac KH |
1177 | /* early check. */ |
1178 | if (page_mapped(page)) | |
1179 | return; | |
1180 | if (page->mapping && !PageAnon(page)) | |
1181 | return; | |
69029cd5 KH |
1182 | __mem_cgroup_uncharge_common(page, MEM_CGROUP_CHARGE_TYPE_MAPPED); |
1183 | } | |
1184 | ||
1185 | void mem_cgroup_uncharge_cache_page(struct page *page) | |
1186 | { | |
1187 | VM_BUG_ON(page_mapped(page)); | |
b7abea96 | 1188 | VM_BUG_ON(page->mapping); |
69029cd5 KH |
1189 | __mem_cgroup_uncharge_common(page, MEM_CGROUP_CHARGE_TYPE_CACHE); |
1190 | } | |
1191 | ||
8c7c6e34 KH |
1192 | /* |
1193 | * called from __delete_from_swap_cache() and drop "page" account. | |
1194 | * memcg information is recorded to swap_cgroup of "ent" | |
1195 | */ | |
1196 | void mem_cgroup_uncharge_swapcache(struct page *page, swp_entry_t ent) | |
1197 | { | |
1198 | struct mem_cgroup *memcg; | |
1199 | ||
1200 | memcg = __mem_cgroup_uncharge_common(page, | |
1201 | MEM_CGROUP_CHARGE_TYPE_SWAPOUT); | |
1202 | /* record memcg information */ | |
1203 | if (do_swap_account && memcg) { | |
1204 | swap_cgroup_record(ent, memcg); | |
1205 | mem_cgroup_get(memcg); | |
1206 | } | |
1207 | } | |
1208 | ||
1209 | #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP | |
1210 | /* | |
1211 | * called from swap_entry_free(). remove record in swap_cgroup and | |
1212 | * uncharge "memsw" account. | |
1213 | */ | |
1214 | void mem_cgroup_uncharge_swap(swp_entry_t ent) | |
d13d1443 | 1215 | { |
8c7c6e34 KH |
1216 | struct mem_cgroup *memcg; |
1217 | ||
1218 | if (!do_swap_account) | |
1219 | return; | |
1220 | ||
1221 | memcg = swap_cgroup_record(ent, NULL); | |
1222 | if (memcg) { | |
1223 | res_counter_uncharge(&memcg->memsw, PAGE_SIZE); | |
1224 | mem_cgroup_put(memcg); | |
1225 | } | |
d13d1443 | 1226 | } |
8c7c6e34 | 1227 | #endif |
d13d1443 | 1228 | |
ae41be37 | 1229 | /* |
01b1ae63 KH |
1230 | * Before starting migration, account PAGE_SIZE to mem_cgroup that the old |
1231 | * page belongs to. | |
ae41be37 | 1232 | */ |
01b1ae63 | 1233 | int mem_cgroup_prepare_migration(struct page *page, struct mem_cgroup **ptr) |
ae41be37 KH |
1234 | { |
1235 | struct page_cgroup *pc; | |
e8589cc1 | 1236 | struct mem_cgroup *mem = NULL; |
e8589cc1 | 1237 | int ret = 0; |
8869b8f6 | 1238 | |
f8d66542 | 1239 | if (mem_cgroup_disabled()) |
4077960e BS |
1240 | return 0; |
1241 | ||
52d4b9ac KH |
1242 | pc = lookup_page_cgroup(page); |
1243 | lock_page_cgroup(pc); | |
1244 | if (PageCgroupUsed(pc)) { | |
e8589cc1 KH |
1245 | mem = pc->mem_cgroup; |
1246 | css_get(&mem->css); | |
e8589cc1 | 1247 | } |
52d4b9ac | 1248 | unlock_page_cgroup(pc); |
01b1ae63 | 1249 | |
e8589cc1 | 1250 | if (mem) { |
01b1ae63 | 1251 | ret = mem_cgroup_try_charge(NULL, GFP_HIGHUSER_MOVABLE, &mem); |
e8589cc1 KH |
1252 | css_put(&mem->css); |
1253 | } | |
01b1ae63 | 1254 | *ptr = mem; |
e8589cc1 | 1255 | return ret; |
ae41be37 | 1256 | } |
8869b8f6 | 1257 | |
69029cd5 | 1258 | /* remove redundant charge if migration failed*/ |
01b1ae63 KH |
1259 | void mem_cgroup_end_migration(struct mem_cgroup *mem, |
1260 | struct page *oldpage, struct page *newpage) | |
ae41be37 | 1261 | { |
01b1ae63 KH |
1262 | struct page *target, *unused; |
1263 | struct page_cgroup *pc; | |
1264 | enum charge_type ctype; | |
1265 | ||
1266 | if (!mem) | |
1267 | return; | |
1268 | ||
1269 | /* at migration success, oldpage->mapping is NULL. */ | |
1270 | if (oldpage->mapping) { | |
1271 | target = oldpage; | |
1272 | unused = NULL; | |
1273 | } else { | |
1274 | target = newpage; | |
1275 | unused = oldpage; | |
1276 | } | |
1277 | ||
1278 | if (PageAnon(target)) | |
1279 | ctype = MEM_CGROUP_CHARGE_TYPE_MAPPED; | |
1280 | else if (page_is_file_cache(target)) | |
1281 | ctype = MEM_CGROUP_CHARGE_TYPE_CACHE; | |
1282 | else | |
1283 | ctype = MEM_CGROUP_CHARGE_TYPE_SHMEM; | |
1284 | ||
1285 | /* unused page is not on radix-tree now. */ | |
d13d1443 | 1286 | if (unused) |
01b1ae63 KH |
1287 | __mem_cgroup_uncharge_common(unused, ctype); |
1288 | ||
1289 | pc = lookup_page_cgroup(target); | |
69029cd5 | 1290 | /* |
01b1ae63 KH |
1291 | * __mem_cgroup_commit_charge() check PCG_USED bit of page_cgroup. |
1292 | * So, double-counting is effectively avoided. | |
1293 | */ | |
1294 | __mem_cgroup_commit_charge(mem, pc, ctype); | |
1295 | ||
1296 | /* | |
1297 | * Both of oldpage and newpage are still under lock_page(). | |
1298 | * Then, we don't have to care about race in radix-tree. | |
1299 | * But we have to be careful that this page is unmapped or not. | |
1300 | * | |
1301 | * There is a case for !page_mapped(). At the start of | |
1302 | * migration, oldpage was mapped. But now, it's zapped. | |
1303 | * But we know *target* page is not freed/reused under us. | |
1304 | * mem_cgroup_uncharge_page() does all necessary checks. | |
69029cd5 | 1305 | */ |
01b1ae63 KH |
1306 | if (ctype == MEM_CGROUP_CHARGE_TYPE_MAPPED) |
1307 | mem_cgroup_uncharge_page(target); | |
ae41be37 | 1308 | } |
78fb7466 | 1309 | |
c9b0ed51 KH |
1310 | /* |
1311 | * A call to try to shrink memory usage under specified resource controller. | |
1312 | * This is typically used for page reclaiming for shmem for reducing side | |
1313 | * effect of page allocation from shmem, which is used by some mem_cgroup. | |
1314 | */ | |
1315 | int mem_cgroup_shrink_usage(struct mm_struct *mm, gfp_t gfp_mask) | |
1316 | { | |
1317 | struct mem_cgroup *mem; | |
1318 | int progress = 0; | |
1319 | int retry = MEM_CGROUP_RECLAIM_RETRIES; | |
1320 | ||
f8d66542 | 1321 | if (mem_cgroup_disabled()) |
cede86ac | 1322 | return 0; |
9623e078 HD |
1323 | if (!mm) |
1324 | return 0; | |
cede86ac | 1325 | |
c9b0ed51 KH |
1326 | rcu_read_lock(); |
1327 | mem = mem_cgroup_from_task(rcu_dereference(mm->owner)); | |
31a78f23 BS |
1328 | if (unlikely(!mem)) { |
1329 | rcu_read_unlock(); | |
1330 | return 0; | |
1331 | } | |
c9b0ed51 KH |
1332 | css_get(&mem->css); |
1333 | rcu_read_unlock(); | |
1334 | ||
1335 | do { | |
8c7c6e34 | 1336 | progress = try_to_free_mem_cgroup_pages(mem, gfp_mask, true); |
a10cebf5 | 1337 | progress += res_counter_check_under_limit(&mem->res); |
c9b0ed51 KH |
1338 | } while (!progress && --retry); |
1339 | ||
1340 | css_put(&mem->css); | |
1341 | if (!retry) | |
1342 | return -ENOMEM; | |
1343 | return 0; | |
1344 | } | |
1345 | ||
8c7c6e34 KH |
1346 | static DEFINE_MUTEX(set_limit_mutex); |
1347 | ||
d38d2a75 | 1348 | static int mem_cgroup_resize_limit(struct mem_cgroup *memcg, |
8c7c6e34 | 1349 | unsigned long long val) |
628f4235 KH |
1350 | { |
1351 | ||
1352 | int retry_count = MEM_CGROUP_RECLAIM_RETRIES; | |
1353 | int progress; | |
8c7c6e34 | 1354 | u64 memswlimit; |
628f4235 KH |
1355 | int ret = 0; |
1356 | ||
8c7c6e34 | 1357 | while (retry_count) { |
628f4235 KH |
1358 | if (signal_pending(current)) { |
1359 | ret = -EINTR; | |
1360 | break; | |
1361 | } | |
8c7c6e34 KH |
1362 | /* |
1363 | * Rather than hide all in some function, I do this in | |
1364 | * open coded manner. You see what this really does. | |
1365 | * We have to guarantee mem->res.limit < mem->memsw.limit. | |
1366 | */ | |
1367 | mutex_lock(&set_limit_mutex); | |
1368 | memswlimit = res_counter_read_u64(&memcg->memsw, RES_LIMIT); | |
1369 | if (memswlimit < val) { | |
1370 | ret = -EINVAL; | |
1371 | mutex_unlock(&set_limit_mutex); | |
628f4235 KH |
1372 | break; |
1373 | } | |
8c7c6e34 KH |
1374 | ret = res_counter_set_limit(&memcg->res, val); |
1375 | mutex_unlock(&set_limit_mutex); | |
1376 | ||
1377 | if (!ret) | |
1378 | break; | |
1379 | ||
bced0520 | 1380 | progress = try_to_free_mem_cgroup_pages(memcg, |
8c7c6e34 KH |
1381 | GFP_HIGHUSER_MOVABLE, false); |
1382 | if (!progress) retry_count--; | |
1383 | } | |
1384 | return ret; | |
1385 | } | |
1386 | ||
1387 | int mem_cgroup_resize_memsw_limit(struct mem_cgroup *memcg, | |
1388 | unsigned long long val) | |
1389 | { | |
1390 | int retry_count = MEM_CGROUP_RECLAIM_RETRIES; | |
1391 | u64 memlimit, oldusage, curusage; | |
1392 | int ret; | |
1393 | ||
1394 | if (!do_swap_account) | |
1395 | return -EINVAL; | |
1396 | ||
1397 | while (retry_count) { | |
1398 | if (signal_pending(current)) { | |
1399 | ret = -EINTR; | |
1400 | break; | |
1401 | } | |
1402 | /* | |
1403 | * Rather than hide all in some function, I do this in | |
1404 | * open coded manner. You see what this really does. | |
1405 | * We have to guarantee mem->res.limit < mem->memsw.limit. | |
1406 | */ | |
1407 | mutex_lock(&set_limit_mutex); | |
1408 | memlimit = res_counter_read_u64(&memcg->res, RES_LIMIT); | |
1409 | if (memlimit > val) { | |
1410 | ret = -EINVAL; | |
1411 | mutex_unlock(&set_limit_mutex); | |
1412 | break; | |
1413 | } | |
1414 | ret = res_counter_set_limit(&memcg->memsw, val); | |
1415 | mutex_unlock(&set_limit_mutex); | |
1416 | ||
1417 | if (!ret) | |
1418 | break; | |
1419 | ||
1420 | oldusage = res_counter_read_u64(&memcg->memsw, RES_USAGE); | |
1421 | try_to_free_mem_cgroup_pages(memcg, GFP_HIGHUSER_MOVABLE, true); | |
1422 | curusage = res_counter_read_u64(&memcg->memsw, RES_USAGE); | |
1423 | if (curusage >= oldusage) | |
628f4235 KH |
1424 | retry_count--; |
1425 | } | |
1426 | return ret; | |
1427 | } | |
1428 | ||
cc847582 KH |
1429 | /* |
1430 | * This routine traverse page_cgroup in given list and drop them all. | |
cc847582 KH |
1431 | * *And* this routine doesn't reclaim page itself, just removes page_cgroup. |
1432 | */ | |
f817ed48 | 1433 | static int mem_cgroup_force_empty_list(struct mem_cgroup *mem, |
08e552c6 | 1434 | int node, int zid, enum lru_list lru) |
cc847582 | 1435 | { |
08e552c6 KH |
1436 | struct zone *zone; |
1437 | struct mem_cgroup_per_zone *mz; | |
f817ed48 | 1438 | struct page_cgroup *pc, *busy; |
08e552c6 | 1439 | unsigned long flags, loop; |
072c56c1 | 1440 | struct list_head *list; |
f817ed48 | 1441 | int ret = 0; |
072c56c1 | 1442 | |
08e552c6 KH |
1443 | zone = &NODE_DATA(node)->node_zones[zid]; |
1444 | mz = mem_cgroup_zoneinfo(mem, node, zid); | |
b69408e8 | 1445 | list = &mz->lists[lru]; |
cc847582 | 1446 | |
f817ed48 KH |
1447 | loop = MEM_CGROUP_ZSTAT(mz, lru); |
1448 | /* give some margin against EBUSY etc...*/ | |
1449 | loop += 256; | |
1450 | busy = NULL; | |
1451 | while (loop--) { | |
1452 | ret = 0; | |
08e552c6 | 1453 | spin_lock_irqsave(&zone->lru_lock, flags); |
f817ed48 | 1454 | if (list_empty(list)) { |
08e552c6 | 1455 | spin_unlock_irqrestore(&zone->lru_lock, flags); |
52d4b9ac | 1456 | break; |
f817ed48 KH |
1457 | } |
1458 | pc = list_entry(list->prev, struct page_cgroup, lru); | |
1459 | if (busy == pc) { | |
1460 | list_move(&pc->lru, list); | |
1461 | busy = 0; | |
08e552c6 | 1462 | spin_unlock_irqrestore(&zone->lru_lock, flags); |
f817ed48 KH |
1463 | continue; |
1464 | } | |
08e552c6 | 1465 | spin_unlock_irqrestore(&zone->lru_lock, flags); |
f817ed48 KH |
1466 | |
1467 | ret = mem_cgroup_move_parent(pc, mem, GFP_HIGHUSER_MOVABLE); | |
1468 | if (ret == -ENOMEM) | |
52d4b9ac | 1469 | break; |
f817ed48 KH |
1470 | |
1471 | if (ret == -EBUSY || ret == -EINVAL) { | |
1472 | /* found lock contention or "pc" is obsolete. */ | |
1473 | busy = pc; | |
1474 | cond_resched(); | |
1475 | } else | |
1476 | busy = NULL; | |
cc847582 | 1477 | } |
08e552c6 | 1478 | |
f817ed48 KH |
1479 | if (!ret && !list_empty(list)) |
1480 | return -EBUSY; | |
1481 | return ret; | |
cc847582 KH |
1482 | } |
1483 | ||
1484 | /* | |
1485 | * make mem_cgroup's charge to be 0 if there is no task. | |
1486 | * This enables deleting this mem_cgroup. | |
1487 | */ | |
c1e862c1 | 1488 | static int mem_cgroup_force_empty(struct mem_cgroup *mem, bool free_all) |
cc847582 | 1489 | { |
f817ed48 KH |
1490 | int ret; |
1491 | int node, zid, shrink; | |
1492 | int nr_retries = MEM_CGROUP_RECLAIM_RETRIES; | |
c1e862c1 | 1493 | struct cgroup *cgrp = mem->css.cgroup; |
8869b8f6 | 1494 | |
cc847582 | 1495 | css_get(&mem->css); |
f817ed48 KH |
1496 | |
1497 | shrink = 0; | |
c1e862c1 KH |
1498 | /* should free all ? */ |
1499 | if (free_all) | |
1500 | goto try_to_free; | |
f817ed48 | 1501 | move_account: |
1ecaab2b | 1502 | while (mem->res.usage > 0) { |
f817ed48 | 1503 | ret = -EBUSY; |
c1e862c1 KH |
1504 | if (cgroup_task_count(cgrp) || !list_empty(&cgrp->children)) |
1505 | goto out; | |
1506 | ret = -EINTR; | |
1507 | if (signal_pending(current)) | |
cc847582 | 1508 | goto out; |
52d4b9ac KH |
1509 | /* This is for making all *used* pages to be on LRU. */ |
1510 | lru_add_drain_all(); | |
f817ed48 KH |
1511 | ret = 0; |
1512 | for_each_node_state(node, N_POSSIBLE) { | |
1513 | for (zid = 0; !ret && zid < MAX_NR_ZONES; zid++) { | |
b69408e8 | 1514 | enum lru_list l; |
f817ed48 KH |
1515 | for_each_lru(l) { |
1516 | ret = mem_cgroup_force_empty_list(mem, | |
08e552c6 | 1517 | node, zid, l); |
f817ed48 KH |
1518 | if (ret) |
1519 | break; | |
1520 | } | |
1ecaab2b | 1521 | } |
f817ed48 KH |
1522 | if (ret) |
1523 | break; | |
1524 | } | |
1525 | /* it seems parent cgroup doesn't have enough mem */ | |
1526 | if (ret == -ENOMEM) | |
1527 | goto try_to_free; | |
52d4b9ac | 1528 | cond_resched(); |
cc847582 KH |
1529 | } |
1530 | ret = 0; | |
1531 | out: | |
1532 | css_put(&mem->css); | |
1533 | return ret; | |
f817ed48 KH |
1534 | |
1535 | try_to_free: | |
c1e862c1 KH |
1536 | /* returns EBUSY if there is a task or if we come here twice. */ |
1537 | if (cgroup_task_count(cgrp) || !list_empty(&cgrp->children) || shrink) { | |
f817ed48 KH |
1538 | ret = -EBUSY; |
1539 | goto out; | |
1540 | } | |
c1e862c1 KH |
1541 | /* we call try-to-free pages for make this cgroup empty */ |
1542 | lru_add_drain_all(); | |
f817ed48 KH |
1543 | /* try to free all pages in this cgroup */ |
1544 | shrink = 1; | |
1545 | while (nr_retries && mem->res.usage > 0) { | |
1546 | int progress; | |
c1e862c1 KH |
1547 | |
1548 | if (signal_pending(current)) { | |
1549 | ret = -EINTR; | |
1550 | goto out; | |
1551 | } | |
f817ed48 | 1552 | progress = try_to_free_mem_cgroup_pages(mem, |
8c7c6e34 | 1553 | GFP_HIGHUSER_MOVABLE, false); |
c1e862c1 | 1554 | if (!progress) { |
f817ed48 | 1555 | nr_retries--; |
c1e862c1 KH |
1556 | /* maybe some writeback is necessary */ |
1557 | congestion_wait(WRITE, HZ/10); | |
1558 | } | |
f817ed48 KH |
1559 | |
1560 | } | |
08e552c6 | 1561 | lru_add_drain(); |
f817ed48 KH |
1562 | /* try move_account...there may be some *locked* pages. */ |
1563 | if (mem->res.usage) | |
1564 | goto move_account; | |
1565 | ret = 0; | |
1566 | goto out; | |
cc847582 KH |
1567 | } |
1568 | ||
c1e862c1 KH |
1569 | int mem_cgroup_force_empty_write(struct cgroup *cont, unsigned int event) |
1570 | { | |
1571 | return mem_cgroup_force_empty(mem_cgroup_from_cont(cont), true); | |
1572 | } | |
1573 | ||
1574 | ||
18f59ea7 BS |
1575 | static u64 mem_cgroup_hierarchy_read(struct cgroup *cont, struct cftype *cft) |
1576 | { | |
1577 | return mem_cgroup_from_cont(cont)->use_hierarchy; | |
1578 | } | |
1579 | ||
1580 | static int mem_cgroup_hierarchy_write(struct cgroup *cont, struct cftype *cft, | |
1581 | u64 val) | |
1582 | { | |
1583 | int retval = 0; | |
1584 | struct mem_cgroup *mem = mem_cgroup_from_cont(cont); | |
1585 | struct cgroup *parent = cont->parent; | |
1586 | struct mem_cgroup *parent_mem = NULL; | |
1587 | ||
1588 | if (parent) | |
1589 | parent_mem = mem_cgroup_from_cont(parent); | |
1590 | ||
1591 | cgroup_lock(); | |
1592 | /* | |
1593 | * If parent's use_hiearchy is set, we can't make any modifications | |
1594 | * in the child subtrees. If it is unset, then the change can | |
1595 | * occur, provided the current cgroup has no children. | |
1596 | * | |
1597 | * For the root cgroup, parent_mem is NULL, we allow value to be | |
1598 | * set if there are no children. | |
1599 | */ | |
1600 | if ((!parent_mem || !parent_mem->use_hierarchy) && | |
1601 | (val == 1 || val == 0)) { | |
1602 | if (list_empty(&cont->children)) | |
1603 | mem->use_hierarchy = val; | |
1604 | else | |
1605 | retval = -EBUSY; | |
1606 | } else | |
1607 | retval = -EINVAL; | |
1608 | cgroup_unlock(); | |
1609 | ||
1610 | return retval; | |
1611 | } | |
1612 | ||
2c3daa72 | 1613 | static u64 mem_cgroup_read(struct cgroup *cont, struct cftype *cft) |
8cdea7c0 | 1614 | { |
8c7c6e34 KH |
1615 | struct mem_cgroup *mem = mem_cgroup_from_cont(cont); |
1616 | u64 val = 0; | |
1617 | int type, name; | |
1618 | ||
1619 | type = MEMFILE_TYPE(cft->private); | |
1620 | name = MEMFILE_ATTR(cft->private); | |
1621 | switch (type) { | |
1622 | case _MEM: | |
1623 | val = res_counter_read_u64(&mem->res, name); | |
1624 | break; | |
1625 | case _MEMSWAP: | |
1626 | if (do_swap_account) | |
1627 | val = res_counter_read_u64(&mem->memsw, name); | |
1628 | break; | |
1629 | default: | |
1630 | BUG(); | |
1631 | break; | |
1632 | } | |
1633 | return val; | |
8cdea7c0 | 1634 | } |
628f4235 KH |
1635 | /* |
1636 | * The user of this function is... | |
1637 | * RES_LIMIT. | |
1638 | */ | |
856c13aa PM |
1639 | static int mem_cgroup_write(struct cgroup *cont, struct cftype *cft, |
1640 | const char *buffer) | |
8cdea7c0 | 1641 | { |
628f4235 | 1642 | struct mem_cgroup *memcg = mem_cgroup_from_cont(cont); |
8c7c6e34 | 1643 | int type, name; |
628f4235 KH |
1644 | unsigned long long val; |
1645 | int ret; | |
1646 | ||
8c7c6e34 KH |
1647 | type = MEMFILE_TYPE(cft->private); |
1648 | name = MEMFILE_ATTR(cft->private); | |
1649 | switch (name) { | |
628f4235 KH |
1650 | case RES_LIMIT: |
1651 | /* This function does all necessary parse...reuse it */ | |
1652 | ret = res_counter_memparse_write_strategy(buffer, &val); | |
8c7c6e34 KH |
1653 | if (ret) |
1654 | break; | |
1655 | if (type == _MEM) | |
628f4235 | 1656 | ret = mem_cgroup_resize_limit(memcg, val); |
8c7c6e34 KH |
1657 | else |
1658 | ret = mem_cgroup_resize_memsw_limit(memcg, val); | |
628f4235 KH |
1659 | break; |
1660 | default: | |
1661 | ret = -EINVAL; /* should be BUG() ? */ | |
1662 | break; | |
1663 | } | |
1664 | return ret; | |
8cdea7c0 BS |
1665 | } |
1666 | ||
29f2a4da | 1667 | static int mem_cgroup_reset(struct cgroup *cont, unsigned int event) |
c84872e1 PE |
1668 | { |
1669 | struct mem_cgroup *mem; | |
8c7c6e34 | 1670 | int type, name; |
c84872e1 PE |
1671 | |
1672 | mem = mem_cgroup_from_cont(cont); | |
8c7c6e34 KH |
1673 | type = MEMFILE_TYPE(event); |
1674 | name = MEMFILE_ATTR(event); | |
1675 | switch (name) { | |
29f2a4da | 1676 | case RES_MAX_USAGE: |
8c7c6e34 KH |
1677 | if (type == _MEM) |
1678 | res_counter_reset_max(&mem->res); | |
1679 | else | |
1680 | res_counter_reset_max(&mem->memsw); | |
29f2a4da PE |
1681 | break; |
1682 | case RES_FAILCNT: | |
8c7c6e34 KH |
1683 | if (type == _MEM) |
1684 | res_counter_reset_failcnt(&mem->res); | |
1685 | else | |
1686 | res_counter_reset_failcnt(&mem->memsw); | |
29f2a4da PE |
1687 | break; |
1688 | } | |
85cc59db | 1689 | return 0; |
c84872e1 PE |
1690 | } |
1691 | ||
d2ceb9b7 KH |
1692 | static const struct mem_cgroup_stat_desc { |
1693 | const char *msg; | |
1694 | u64 unit; | |
1695 | } mem_cgroup_stat_desc[] = { | |
1696 | [MEM_CGROUP_STAT_CACHE] = { "cache", PAGE_SIZE, }, | |
1697 | [MEM_CGROUP_STAT_RSS] = { "rss", PAGE_SIZE, }, | |
55e462b0 BR |
1698 | [MEM_CGROUP_STAT_PGPGIN_COUNT] = {"pgpgin", 1, }, |
1699 | [MEM_CGROUP_STAT_PGPGOUT_COUNT] = {"pgpgout", 1, }, | |
d2ceb9b7 KH |
1700 | }; |
1701 | ||
c64745cf PM |
1702 | static int mem_control_stat_show(struct cgroup *cont, struct cftype *cft, |
1703 | struct cgroup_map_cb *cb) | |
d2ceb9b7 | 1704 | { |
d2ceb9b7 KH |
1705 | struct mem_cgroup *mem_cont = mem_cgroup_from_cont(cont); |
1706 | struct mem_cgroup_stat *stat = &mem_cont->stat; | |
1707 | int i; | |
1708 | ||
1709 | for (i = 0; i < ARRAY_SIZE(stat->cpustat[0].count); i++) { | |
1710 | s64 val; | |
1711 | ||
1712 | val = mem_cgroup_read_stat(stat, i); | |
1713 | val *= mem_cgroup_stat_desc[i].unit; | |
c64745cf | 1714 | cb->fill(cb, mem_cgroup_stat_desc[i].msg, val); |
d2ceb9b7 | 1715 | } |
6d12e2d8 KH |
1716 | /* showing # of active pages */ |
1717 | { | |
4f98a2fe RR |
1718 | unsigned long active_anon, inactive_anon; |
1719 | unsigned long active_file, inactive_file; | |
7b854121 | 1720 | unsigned long unevictable; |
4f98a2fe RR |
1721 | |
1722 | inactive_anon = mem_cgroup_get_all_zonestat(mem_cont, | |
1723 | LRU_INACTIVE_ANON); | |
1724 | active_anon = mem_cgroup_get_all_zonestat(mem_cont, | |
1725 | LRU_ACTIVE_ANON); | |
1726 | inactive_file = mem_cgroup_get_all_zonestat(mem_cont, | |
1727 | LRU_INACTIVE_FILE); | |
1728 | active_file = mem_cgroup_get_all_zonestat(mem_cont, | |
1729 | LRU_ACTIVE_FILE); | |
7b854121 LS |
1730 | unevictable = mem_cgroup_get_all_zonestat(mem_cont, |
1731 | LRU_UNEVICTABLE); | |
1732 | ||
4f98a2fe RR |
1733 | cb->fill(cb, "active_anon", (active_anon) * PAGE_SIZE); |
1734 | cb->fill(cb, "inactive_anon", (inactive_anon) * PAGE_SIZE); | |
1735 | cb->fill(cb, "active_file", (active_file) * PAGE_SIZE); | |
1736 | cb->fill(cb, "inactive_file", (inactive_file) * PAGE_SIZE); | |
7b854121 LS |
1737 | cb->fill(cb, "unevictable", unevictable * PAGE_SIZE); |
1738 | ||
6d12e2d8 | 1739 | } |
d2ceb9b7 KH |
1740 | return 0; |
1741 | } | |
1742 | ||
c1e862c1 | 1743 | |
8cdea7c0 BS |
1744 | static struct cftype mem_cgroup_files[] = { |
1745 | { | |
0eea1030 | 1746 | .name = "usage_in_bytes", |
8c7c6e34 | 1747 | .private = MEMFILE_PRIVATE(_MEM, RES_USAGE), |
2c3daa72 | 1748 | .read_u64 = mem_cgroup_read, |
8cdea7c0 | 1749 | }, |
c84872e1 PE |
1750 | { |
1751 | .name = "max_usage_in_bytes", | |
8c7c6e34 | 1752 | .private = MEMFILE_PRIVATE(_MEM, RES_MAX_USAGE), |
29f2a4da | 1753 | .trigger = mem_cgroup_reset, |
c84872e1 PE |
1754 | .read_u64 = mem_cgroup_read, |
1755 | }, | |
8cdea7c0 | 1756 | { |
0eea1030 | 1757 | .name = "limit_in_bytes", |
8c7c6e34 | 1758 | .private = MEMFILE_PRIVATE(_MEM, RES_LIMIT), |
856c13aa | 1759 | .write_string = mem_cgroup_write, |
2c3daa72 | 1760 | .read_u64 = mem_cgroup_read, |
8cdea7c0 BS |
1761 | }, |
1762 | { | |
1763 | .name = "failcnt", | |
8c7c6e34 | 1764 | .private = MEMFILE_PRIVATE(_MEM, RES_FAILCNT), |
29f2a4da | 1765 | .trigger = mem_cgroup_reset, |
2c3daa72 | 1766 | .read_u64 = mem_cgroup_read, |
8cdea7c0 | 1767 | }, |
d2ceb9b7 KH |
1768 | { |
1769 | .name = "stat", | |
c64745cf | 1770 | .read_map = mem_control_stat_show, |
d2ceb9b7 | 1771 | }, |
c1e862c1 KH |
1772 | { |
1773 | .name = "force_empty", | |
1774 | .trigger = mem_cgroup_force_empty_write, | |
1775 | }, | |
18f59ea7 BS |
1776 | { |
1777 | .name = "use_hierarchy", | |
1778 | .write_u64 = mem_cgroup_hierarchy_write, | |
1779 | .read_u64 = mem_cgroup_hierarchy_read, | |
1780 | }, | |
8cdea7c0 BS |
1781 | }; |
1782 | ||
8c7c6e34 KH |
1783 | #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP |
1784 | static struct cftype memsw_cgroup_files[] = { | |
1785 | { | |
1786 | .name = "memsw.usage_in_bytes", | |
1787 | .private = MEMFILE_PRIVATE(_MEMSWAP, RES_USAGE), | |
1788 | .read_u64 = mem_cgroup_read, | |
1789 | }, | |
1790 | { | |
1791 | .name = "memsw.max_usage_in_bytes", | |
1792 | .private = MEMFILE_PRIVATE(_MEMSWAP, RES_MAX_USAGE), | |
1793 | .trigger = mem_cgroup_reset, | |
1794 | .read_u64 = mem_cgroup_read, | |
1795 | }, | |
1796 | { | |
1797 | .name = "memsw.limit_in_bytes", | |
1798 | .private = MEMFILE_PRIVATE(_MEMSWAP, RES_LIMIT), | |
1799 | .write_string = mem_cgroup_write, | |
1800 | .read_u64 = mem_cgroup_read, | |
1801 | }, | |
1802 | { | |
1803 | .name = "memsw.failcnt", | |
1804 | .private = MEMFILE_PRIVATE(_MEMSWAP, RES_FAILCNT), | |
1805 | .trigger = mem_cgroup_reset, | |
1806 | .read_u64 = mem_cgroup_read, | |
1807 | }, | |
1808 | }; | |
1809 | ||
1810 | static int register_memsw_files(struct cgroup *cont, struct cgroup_subsys *ss) | |
1811 | { | |
1812 | if (!do_swap_account) | |
1813 | return 0; | |
1814 | return cgroup_add_files(cont, ss, memsw_cgroup_files, | |
1815 | ARRAY_SIZE(memsw_cgroup_files)); | |
1816 | }; | |
1817 | #else | |
1818 | static int register_memsw_files(struct cgroup *cont, struct cgroup_subsys *ss) | |
1819 | { | |
1820 | return 0; | |
1821 | } | |
1822 | #endif | |
1823 | ||
6d12e2d8 KH |
1824 | static int alloc_mem_cgroup_per_zone_info(struct mem_cgroup *mem, int node) |
1825 | { | |
1826 | struct mem_cgroup_per_node *pn; | |
1ecaab2b | 1827 | struct mem_cgroup_per_zone *mz; |
b69408e8 | 1828 | enum lru_list l; |
41e3355d | 1829 | int zone, tmp = node; |
1ecaab2b KH |
1830 | /* |
1831 | * This routine is called against possible nodes. | |
1832 | * But it's BUG to call kmalloc() against offline node. | |
1833 | * | |
1834 | * TODO: this routine can waste much memory for nodes which will | |
1835 | * never be onlined. It's better to use memory hotplug callback | |
1836 | * function. | |
1837 | */ | |
41e3355d KH |
1838 | if (!node_state(node, N_NORMAL_MEMORY)) |
1839 | tmp = -1; | |
1840 | pn = kmalloc_node(sizeof(*pn), GFP_KERNEL, tmp); | |
6d12e2d8 KH |
1841 | if (!pn) |
1842 | return 1; | |
1ecaab2b | 1843 | |
6d12e2d8 KH |
1844 | mem->info.nodeinfo[node] = pn; |
1845 | memset(pn, 0, sizeof(*pn)); | |
1ecaab2b KH |
1846 | |
1847 | for (zone = 0; zone < MAX_NR_ZONES; zone++) { | |
1848 | mz = &pn->zoneinfo[zone]; | |
b69408e8 CL |
1849 | for_each_lru(l) |
1850 | INIT_LIST_HEAD(&mz->lists[l]); | |
1ecaab2b | 1851 | } |
6d12e2d8 KH |
1852 | return 0; |
1853 | } | |
1854 | ||
1ecaab2b KH |
1855 | static void free_mem_cgroup_per_zone_info(struct mem_cgroup *mem, int node) |
1856 | { | |
1857 | kfree(mem->info.nodeinfo[node]); | |
1858 | } | |
1859 | ||
c8dad2bb JB |
1860 | static int mem_cgroup_size(void) |
1861 | { | |
1862 | int cpustat_size = nr_cpu_ids * sizeof(struct mem_cgroup_stat_cpu); | |
1863 | return sizeof(struct mem_cgroup) + cpustat_size; | |
1864 | } | |
1865 | ||
33327948 KH |
1866 | static struct mem_cgroup *mem_cgroup_alloc(void) |
1867 | { | |
1868 | struct mem_cgroup *mem; | |
c8dad2bb | 1869 | int size = mem_cgroup_size(); |
33327948 | 1870 | |
c8dad2bb JB |
1871 | if (size < PAGE_SIZE) |
1872 | mem = kmalloc(size, GFP_KERNEL); | |
33327948 | 1873 | else |
c8dad2bb | 1874 | mem = vmalloc(size); |
33327948 KH |
1875 | |
1876 | if (mem) | |
c8dad2bb | 1877 | memset(mem, 0, size); |
33327948 KH |
1878 | return mem; |
1879 | } | |
1880 | ||
8c7c6e34 KH |
1881 | /* |
1882 | * At destroying mem_cgroup, references from swap_cgroup can remain. | |
1883 | * (scanning all at force_empty is too costly...) | |
1884 | * | |
1885 | * Instead of clearing all references at force_empty, we remember | |
1886 | * the number of reference from swap_cgroup and free mem_cgroup when | |
1887 | * it goes down to 0. | |
1888 | * | |
1889 | * When mem_cgroup is destroyed, mem->obsolete will be set to 0 and | |
1890 | * entry which points to this memcg will be ignore at swapin. | |
1891 | * | |
1892 | * Removal of cgroup itself succeeds regardless of refs from swap. | |
1893 | */ | |
1894 | ||
33327948 KH |
1895 | static void mem_cgroup_free(struct mem_cgroup *mem) |
1896 | { | |
08e552c6 KH |
1897 | int node; |
1898 | ||
8c7c6e34 KH |
1899 | if (atomic_read(&mem->refcnt) > 0) |
1900 | return; | |
08e552c6 KH |
1901 | |
1902 | ||
1903 | for_each_node_state(node, N_POSSIBLE) | |
1904 | free_mem_cgroup_per_zone_info(mem, node); | |
1905 | ||
c8dad2bb | 1906 | if (mem_cgroup_size() < PAGE_SIZE) |
33327948 KH |
1907 | kfree(mem); |
1908 | else | |
1909 | vfree(mem); | |
1910 | } | |
1911 | ||
8c7c6e34 KH |
1912 | static void mem_cgroup_get(struct mem_cgroup *mem) |
1913 | { | |
1914 | atomic_inc(&mem->refcnt); | |
1915 | } | |
1916 | ||
1917 | static void mem_cgroup_put(struct mem_cgroup *mem) | |
1918 | { | |
1919 | if (atomic_dec_and_test(&mem->refcnt)) { | |
1920 | if (!mem->obsolete) | |
1921 | return; | |
1922 | mem_cgroup_free(mem); | |
1923 | } | |
1924 | } | |
1925 | ||
33327948 | 1926 | |
c077719b KH |
1927 | #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP |
1928 | static void __init enable_swap_cgroup(void) | |
1929 | { | |
f8d66542 | 1930 | if (!mem_cgroup_disabled() && really_do_swap_account) |
c077719b KH |
1931 | do_swap_account = 1; |
1932 | } | |
1933 | #else | |
1934 | static void __init enable_swap_cgroup(void) | |
1935 | { | |
1936 | } | |
1937 | #endif | |
1938 | ||
8cdea7c0 BS |
1939 | static struct cgroup_subsys_state * |
1940 | mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont) | |
1941 | { | |
28dbc4b6 | 1942 | struct mem_cgroup *mem, *parent; |
6d12e2d8 | 1943 | int node; |
8cdea7c0 | 1944 | |
c8dad2bb JB |
1945 | mem = mem_cgroup_alloc(); |
1946 | if (!mem) | |
1947 | return ERR_PTR(-ENOMEM); | |
78fb7466 | 1948 | |
6d12e2d8 KH |
1949 | for_each_node_state(node, N_POSSIBLE) |
1950 | if (alloc_mem_cgroup_per_zone_info(mem, node)) | |
1951 | goto free_out; | |
c077719b | 1952 | /* root ? */ |
28dbc4b6 | 1953 | if (cont->parent == NULL) { |
c077719b | 1954 | enable_swap_cgroup(); |
28dbc4b6 | 1955 | parent = NULL; |
18f59ea7 | 1956 | } else { |
28dbc4b6 | 1957 | parent = mem_cgroup_from_cont(cont->parent); |
18f59ea7 BS |
1958 | mem->use_hierarchy = parent->use_hierarchy; |
1959 | } | |
28dbc4b6 | 1960 | |
18f59ea7 BS |
1961 | if (parent && parent->use_hierarchy) { |
1962 | res_counter_init(&mem->res, &parent->res); | |
1963 | res_counter_init(&mem->memsw, &parent->memsw); | |
1964 | } else { | |
1965 | res_counter_init(&mem->res, NULL); | |
1966 | res_counter_init(&mem->memsw, NULL); | |
1967 | } | |
6d12e2d8 | 1968 | |
6d61ef40 BS |
1969 | mem->last_scanned_child = NULL; |
1970 | ||
8cdea7c0 | 1971 | return &mem->css; |
6d12e2d8 KH |
1972 | free_out: |
1973 | for_each_node_state(node, N_POSSIBLE) | |
1ecaab2b | 1974 | free_mem_cgroup_per_zone_info(mem, node); |
c8dad2bb | 1975 | mem_cgroup_free(mem); |
2dda81ca | 1976 | return ERR_PTR(-ENOMEM); |
8cdea7c0 BS |
1977 | } |
1978 | ||
df878fb0 KH |
1979 | static void mem_cgroup_pre_destroy(struct cgroup_subsys *ss, |
1980 | struct cgroup *cont) | |
1981 | { | |
1982 | struct mem_cgroup *mem = mem_cgroup_from_cont(cont); | |
8c7c6e34 | 1983 | mem->obsolete = 1; |
c1e862c1 | 1984 | mem_cgroup_force_empty(mem, false); |
df878fb0 KH |
1985 | } |
1986 | ||
8cdea7c0 BS |
1987 | static void mem_cgroup_destroy(struct cgroup_subsys *ss, |
1988 | struct cgroup *cont) | |
1989 | { | |
33327948 | 1990 | mem_cgroup_free(mem_cgroup_from_cont(cont)); |
8cdea7c0 BS |
1991 | } |
1992 | ||
1993 | static int mem_cgroup_populate(struct cgroup_subsys *ss, | |
1994 | struct cgroup *cont) | |
1995 | { | |
8c7c6e34 KH |
1996 | int ret; |
1997 | ||
1998 | ret = cgroup_add_files(cont, ss, mem_cgroup_files, | |
1999 | ARRAY_SIZE(mem_cgroup_files)); | |
2000 | ||
2001 | if (!ret) | |
2002 | ret = register_memsw_files(cont, ss); | |
2003 | return ret; | |
8cdea7c0 BS |
2004 | } |
2005 | ||
67e465a7 BS |
2006 | static void mem_cgroup_move_task(struct cgroup_subsys *ss, |
2007 | struct cgroup *cont, | |
2008 | struct cgroup *old_cont, | |
2009 | struct task_struct *p) | |
2010 | { | |
2011 | struct mm_struct *mm; | |
2012 | struct mem_cgroup *mem, *old_mem; | |
2013 | ||
2014 | mm = get_task_mm(p); | |
2015 | if (mm == NULL) | |
2016 | return; | |
2017 | ||
2018 | mem = mem_cgroup_from_cont(cont); | |
2019 | old_mem = mem_cgroup_from_cont(old_cont); | |
2020 | ||
67e465a7 BS |
2021 | /* |
2022 | * Only thread group leaders are allowed to migrate, the mm_struct is | |
2023 | * in effect owned by the leader | |
2024 | */ | |
52ea27eb | 2025 | if (!thread_group_leader(p)) |
67e465a7 BS |
2026 | goto out; |
2027 | ||
67e465a7 BS |
2028 | out: |
2029 | mmput(mm); | |
67e465a7 BS |
2030 | } |
2031 | ||
8cdea7c0 BS |
2032 | struct cgroup_subsys mem_cgroup_subsys = { |
2033 | .name = "memory", | |
2034 | .subsys_id = mem_cgroup_subsys_id, | |
2035 | .create = mem_cgroup_create, | |
df878fb0 | 2036 | .pre_destroy = mem_cgroup_pre_destroy, |
8cdea7c0 BS |
2037 | .destroy = mem_cgroup_destroy, |
2038 | .populate = mem_cgroup_populate, | |
67e465a7 | 2039 | .attach = mem_cgroup_move_task, |
6d12e2d8 | 2040 | .early_init = 0, |
8cdea7c0 | 2041 | }; |
c077719b KH |
2042 | |
2043 | #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP | |
2044 | ||
2045 | static int __init disable_swap_account(char *s) | |
2046 | { | |
2047 | really_do_swap_account = 0; | |
2048 | return 1; | |
2049 | } | |
2050 | __setup("noswapaccount", disable_swap_account); | |
2051 | #endif |