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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> |
d52aa412 | 24 | #include <linux/smp.h> |
8a9f3ccd | 25 | #include <linux/page-flags.h> |
66e1707b | 26 | #include <linux/backing-dev.h> |
8a9f3ccd BS |
27 | #include <linux/bit_spinlock.h> |
28 | #include <linux/rcupdate.h> | |
66e1707b BS |
29 | #include <linux/swap.h> |
30 | #include <linux/spinlock.h> | |
31 | #include <linux/fs.h> | |
d2ceb9b7 | 32 | #include <linux/seq_file.h> |
8cdea7c0 | 33 | |
8697d331 BS |
34 | #include <asm/uaccess.h> |
35 | ||
8cdea7c0 | 36 | struct cgroup_subsys mem_cgroup_subsys; |
66e1707b | 37 | static const int MEM_CGROUP_RECLAIM_RETRIES = 5; |
8cdea7c0 | 38 | |
d52aa412 KH |
39 | /* |
40 | * Statistics for memory cgroup. | |
41 | */ | |
42 | enum mem_cgroup_stat_index { | |
43 | /* | |
44 | * For MEM_CONTAINER_TYPE_ALL, usage = pagecache + rss. | |
45 | */ | |
46 | MEM_CGROUP_STAT_CACHE, /* # of pages charged as cache */ | |
47 | MEM_CGROUP_STAT_RSS, /* # of pages charged as rss */ | |
48 | ||
49 | MEM_CGROUP_STAT_NSTATS, | |
50 | }; | |
51 | ||
52 | struct mem_cgroup_stat_cpu { | |
53 | s64 count[MEM_CGROUP_STAT_NSTATS]; | |
54 | } ____cacheline_aligned_in_smp; | |
55 | ||
56 | struct mem_cgroup_stat { | |
57 | struct mem_cgroup_stat_cpu cpustat[NR_CPUS]; | |
58 | }; | |
59 | ||
60 | /* | |
61 | * For accounting under irq disable, no need for increment preempt count. | |
62 | */ | |
63 | static void __mem_cgroup_stat_add_safe(struct mem_cgroup_stat *stat, | |
64 | enum mem_cgroup_stat_index idx, int val) | |
65 | { | |
66 | int cpu = smp_processor_id(); | |
67 | stat->cpustat[cpu].count[idx] += val; | |
68 | } | |
69 | ||
70 | static s64 mem_cgroup_read_stat(struct mem_cgroup_stat *stat, | |
71 | enum mem_cgroup_stat_index idx) | |
72 | { | |
73 | int cpu; | |
74 | s64 ret = 0; | |
75 | for_each_possible_cpu(cpu) | |
76 | ret += stat->cpustat[cpu].count[idx]; | |
77 | return ret; | |
78 | } | |
79 | ||
6d12e2d8 KH |
80 | /* |
81 | * per-zone information in memory controller. | |
82 | */ | |
83 | ||
84 | enum mem_cgroup_zstat_index { | |
85 | MEM_CGROUP_ZSTAT_ACTIVE, | |
86 | MEM_CGROUP_ZSTAT_INACTIVE, | |
87 | ||
88 | NR_MEM_CGROUP_ZSTAT, | |
89 | }; | |
90 | ||
91 | struct mem_cgroup_per_zone { | |
072c56c1 KH |
92 | /* |
93 | * spin_lock to protect the per cgroup LRU | |
94 | */ | |
95 | spinlock_t lru_lock; | |
1ecaab2b KH |
96 | struct list_head active_list; |
97 | struct list_head inactive_list; | |
6d12e2d8 KH |
98 | unsigned long count[NR_MEM_CGROUP_ZSTAT]; |
99 | }; | |
100 | /* Macro for accessing counter */ | |
101 | #define MEM_CGROUP_ZSTAT(mz, idx) ((mz)->count[(idx)]) | |
102 | ||
103 | struct mem_cgroup_per_node { | |
104 | struct mem_cgroup_per_zone zoneinfo[MAX_NR_ZONES]; | |
105 | }; | |
106 | ||
107 | struct mem_cgroup_lru_info { | |
108 | struct mem_cgroup_per_node *nodeinfo[MAX_NUMNODES]; | |
109 | }; | |
110 | ||
8cdea7c0 BS |
111 | /* |
112 | * The memory controller data structure. The memory controller controls both | |
113 | * page cache and RSS per cgroup. We would eventually like to provide | |
114 | * statistics based on the statistics developed by Rik Van Riel for clock-pro, | |
115 | * to help the administrator determine what knobs to tune. | |
116 | * | |
117 | * TODO: Add a water mark for the memory controller. Reclaim will begin when | |
8a9f3ccd BS |
118 | * we hit the water mark. May be even add a low water mark, such that |
119 | * no reclaim occurs from a cgroup at it's low water mark, this is | |
120 | * a feature that will be implemented much later in the future. | |
8cdea7c0 BS |
121 | */ |
122 | struct mem_cgroup { | |
123 | struct cgroup_subsys_state css; | |
124 | /* | |
125 | * the counter to account for memory usage | |
126 | */ | |
127 | struct res_counter res; | |
78fb7466 PE |
128 | /* |
129 | * Per cgroup active and inactive list, similar to the | |
130 | * per zone LRU lists. | |
78fb7466 | 131 | */ |
6d12e2d8 | 132 | struct mem_cgroup_lru_info info; |
072c56c1 | 133 | |
6c48a1d0 | 134 | int prev_priority; /* for recording reclaim priority */ |
d52aa412 KH |
135 | /* |
136 | * statistics. | |
137 | */ | |
138 | struct mem_cgroup_stat stat; | |
8cdea7c0 BS |
139 | }; |
140 | ||
8a9f3ccd BS |
141 | /* |
142 | * We use the lower bit of the page->page_cgroup pointer as a bit spin | |
9442ec9d HD |
143 | * lock. We need to ensure that page->page_cgroup is at least two |
144 | * byte aligned (based on comments from Nick Piggin). But since | |
145 | * bit_spin_lock doesn't actually set that lock bit in a non-debug | |
146 | * uniprocessor kernel, we should avoid setting it here too. | |
8a9f3ccd BS |
147 | */ |
148 | #define PAGE_CGROUP_LOCK_BIT 0x0 | |
9442ec9d HD |
149 | #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK) |
150 | #define PAGE_CGROUP_LOCK (1 << PAGE_CGROUP_LOCK_BIT) | |
151 | #else | |
152 | #define PAGE_CGROUP_LOCK 0x0 | |
153 | #endif | |
8a9f3ccd | 154 | |
8cdea7c0 BS |
155 | /* |
156 | * A page_cgroup page is associated with every page descriptor. The | |
157 | * page_cgroup helps us identify information about the cgroup | |
158 | */ | |
159 | struct page_cgroup { | |
160 | struct list_head lru; /* per cgroup LRU list */ | |
161 | struct page *page; | |
162 | struct mem_cgroup *mem_cgroup; | |
8a9f3ccd BS |
163 | atomic_t ref_cnt; /* Helpful when pages move b/w */ |
164 | /* mapped and cached states */ | |
217bc319 | 165 | int flags; |
8cdea7c0 | 166 | }; |
217bc319 | 167 | #define PAGE_CGROUP_FLAG_CACHE (0x1) /* charged as cache */ |
3564c7c4 | 168 | #define PAGE_CGROUP_FLAG_ACTIVE (0x2) /* page is active in this cgroup */ |
8cdea7c0 | 169 | |
c0149530 KH |
170 | static inline int page_cgroup_nid(struct page_cgroup *pc) |
171 | { | |
172 | return page_to_nid(pc->page); | |
173 | } | |
174 | ||
175 | static inline enum zone_type page_cgroup_zid(struct page_cgroup *pc) | |
176 | { | |
177 | return page_zonenum(pc->page); | |
178 | } | |
179 | ||
8697d331 BS |
180 | enum { |
181 | MEM_CGROUP_TYPE_UNSPEC = 0, | |
182 | MEM_CGROUP_TYPE_MAPPED, | |
183 | MEM_CGROUP_TYPE_CACHED, | |
184 | MEM_CGROUP_TYPE_ALL, | |
185 | MEM_CGROUP_TYPE_MAX, | |
186 | }; | |
187 | ||
217bc319 KH |
188 | enum charge_type { |
189 | MEM_CGROUP_CHARGE_TYPE_CACHE = 0, | |
190 | MEM_CGROUP_CHARGE_TYPE_MAPPED, | |
191 | }; | |
192 | ||
6d12e2d8 | 193 | |
d52aa412 KH |
194 | /* |
195 | * Always modified under lru lock. Then, not necessary to preempt_disable() | |
196 | */ | |
197 | static void mem_cgroup_charge_statistics(struct mem_cgroup *mem, int flags, | |
198 | bool charge) | |
199 | { | |
200 | int val = (charge)? 1 : -1; | |
201 | struct mem_cgroup_stat *stat = &mem->stat; | |
202 | VM_BUG_ON(!irqs_disabled()); | |
203 | ||
204 | if (flags & PAGE_CGROUP_FLAG_CACHE) | |
205 | __mem_cgroup_stat_add_safe(stat, | |
206 | MEM_CGROUP_STAT_CACHE, val); | |
207 | else | |
208 | __mem_cgroup_stat_add_safe(stat, MEM_CGROUP_STAT_RSS, val); | |
6d12e2d8 KH |
209 | } |
210 | ||
211 | static inline struct mem_cgroup_per_zone * | |
212 | mem_cgroup_zoneinfo(struct mem_cgroup *mem, int nid, int zid) | |
213 | { | |
214 | BUG_ON(!mem->info.nodeinfo[nid]); | |
215 | return &mem->info.nodeinfo[nid]->zoneinfo[zid]; | |
216 | } | |
217 | ||
218 | static inline struct mem_cgroup_per_zone * | |
219 | page_cgroup_zoneinfo(struct page_cgroup *pc) | |
220 | { | |
221 | struct mem_cgroup *mem = pc->mem_cgroup; | |
222 | int nid = page_cgroup_nid(pc); | |
223 | int zid = page_cgroup_zid(pc); | |
d52aa412 | 224 | |
6d12e2d8 KH |
225 | return mem_cgroup_zoneinfo(mem, nid, zid); |
226 | } | |
227 | ||
228 | static unsigned long mem_cgroup_get_all_zonestat(struct mem_cgroup *mem, | |
229 | enum mem_cgroup_zstat_index idx) | |
230 | { | |
231 | int nid, zid; | |
232 | struct mem_cgroup_per_zone *mz; | |
233 | u64 total = 0; | |
234 | ||
235 | for_each_online_node(nid) | |
236 | for (zid = 0; zid < MAX_NR_ZONES; zid++) { | |
237 | mz = mem_cgroup_zoneinfo(mem, nid, zid); | |
238 | total += MEM_CGROUP_ZSTAT(mz, idx); | |
239 | } | |
240 | return total; | |
d52aa412 KH |
241 | } |
242 | ||
8697d331 | 243 | static struct mem_cgroup init_mem_cgroup; |
8cdea7c0 BS |
244 | |
245 | static inline | |
246 | struct mem_cgroup *mem_cgroup_from_cont(struct cgroup *cont) | |
247 | { | |
248 | return container_of(cgroup_subsys_state(cont, | |
249 | mem_cgroup_subsys_id), struct mem_cgroup, | |
250 | css); | |
251 | } | |
252 | ||
78fb7466 PE |
253 | static inline |
254 | struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p) | |
255 | { | |
256 | return container_of(task_subsys_state(p, mem_cgroup_subsys_id), | |
257 | struct mem_cgroup, css); | |
258 | } | |
259 | ||
260 | void mm_init_cgroup(struct mm_struct *mm, struct task_struct *p) | |
261 | { | |
262 | struct mem_cgroup *mem; | |
263 | ||
264 | mem = mem_cgroup_from_task(p); | |
265 | css_get(&mem->css); | |
266 | mm->mem_cgroup = mem; | |
267 | } | |
268 | ||
269 | void mm_free_cgroup(struct mm_struct *mm) | |
270 | { | |
271 | css_put(&mm->mem_cgroup->css); | |
272 | } | |
273 | ||
8a9f3ccd BS |
274 | static inline int page_cgroup_locked(struct page *page) |
275 | { | |
276 | return bit_spin_is_locked(PAGE_CGROUP_LOCK_BIT, | |
277 | &page->page_cgroup); | |
278 | } | |
279 | ||
9442ec9d | 280 | static void page_assign_page_cgroup(struct page *page, struct page_cgroup *pc) |
78fb7466 | 281 | { |
9442ec9d HD |
282 | VM_BUG_ON(!page_cgroup_locked(page)); |
283 | page->page_cgroup = ((unsigned long)pc | PAGE_CGROUP_LOCK); | |
78fb7466 PE |
284 | } |
285 | ||
286 | struct page_cgroup *page_get_page_cgroup(struct page *page) | |
287 | { | |
8a9f3ccd BS |
288 | return (struct page_cgroup *) |
289 | (page->page_cgroup & ~PAGE_CGROUP_LOCK); | |
290 | } | |
291 | ||
8697d331 | 292 | static void __always_inline lock_page_cgroup(struct page *page) |
8a9f3ccd BS |
293 | { |
294 | bit_spin_lock(PAGE_CGROUP_LOCK_BIT, &page->page_cgroup); | |
295 | VM_BUG_ON(!page_cgroup_locked(page)); | |
296 | } | |
297 | ||
8697d331 | 298 | static void __always_inline unlock_page_cgroup(struct page *page) |
8a9f3ccd BS |
299 | { |
300 | bit_spin_unlock(PAGE_CGROUP_LOCK_BIT, &page->page_cgroup); | |
301 | } | |
302 | ||
9175e031 KH |
303 | /* |
304 | * Tie new page_cgroup to struct page under lock_page_cgroup() | |
305 | * This can fail if the page has been tied to a page_cgroup. | |
306 | * If success, returns 0. | |
307 | */ | |
d52aa412 KH |
308 | static int page_cgroup_assign_new_page_cgroup(struct page *page, |
309 | struct page_cgroup *pc) | |
9175e031 KH |
310 | { |
311 | int ret = 0; | |
312 | ||
313 | lock_page_cgroup(page); | |
314 | if (!page_get_page_cgroup(page)) | |
315 | page_assign_page_cgroup(page, pc); | |
316 | else /* A page is tied to other pc. */ | |
317 | ret = 1; | |
318 | unlock_page_cgroup(page); | |
319 | return ret; | |
320 | } | |
321 | ||
322 | /* | |
323 | * Clear page->page_cgroup member under lock_page_cgroup(). | |
324 | * If given "pc" value is different from one page->page_cgroup, | |
325 | * page->cgroup is not cleared. | |
326 | * Returns a value of page->page_cgroup at lock taken. | |
327 | * A can can detect failure of clearing by following | |
328 | * clear_page_cgroup(page, pc) == pc | |
329 | */ | |
330 | ||
d52aa412 KH |
331 | static struct page_cgroup *clear_page_cgroup(struct page *page, |
332 | struct page_cgroup *pc) | |
9175e031 KH |
333 | { |
334 | struct page_cgroup *ret; | |
335 | /* lock and clear */ | |
336 | lock_page_cgroup(page); | |
337 | ret = page_get_page_cgroup(page); | |
338 | if (likely(ret == pc)) | |
339 | page_assign_page_cgroup(page, NULL); | |
340 | unlock_page_cgroup(page); | |
341 | return ret; | |
342 | } | |
343 | ||
6d12e2d8 KH |
344 | static void __mem_cgroup_remove_list(struct page_cgroup *pc) |
345 | { | |
346 | int from = pc->flags & PAGE_CGROUP_FLAG_ACTIVE; | |
347 | struct mem_cgroup_per_zone *mz = page_cgroup_zoneinfo(pc); | |
348 | ||
349 | if (from) | |
350 | MEM_CGROUP_ZSTAT(mz, MEM_CGROUP_ZSTAT_ACTIVE) -= 1; | |
351 | else | |
352 | MEM_CGROUP_ZSTAT(mz, MEM_CGROUP_ZSTAT_INACTIVE) -= 1; | |
353 | ||
354 | mem_cgroup_charge_statistics(pc->mem_cgroup, pc->flags, false); | |
355 | list_del_init(&pc->lru); | |
356 | } | |
357 | ||
358 | static void __mem_cgroup_add_list(struct page_cgroup *pc) | |
359 | { | |
360 | int to = pc->flags & PAGE_CGROUP_FLAG_ACTIVE; | |
361 | struct mem_cgroup_per_zone *mz = page_cgroup_zoneinfo(pc); | |
362 | ||
363 | if (!to) { | |
364 | MEM_CGROUP_ZSTAT(mz, MEM_CGROUP_ZSTAT_INACTIVE) += 1; | |
1ecaab2b | 365 | list_add(&pc->lru, &mz->inactive_list); |
6d12e2d8 KH |
366 | } else { |
367 | MEM_CGROUP_ZSTAT(mz, MEM_CGROUP_ZSTAT_ACTIVE) += 1; | |
1ecaab2b | 368 | list_add(&pc->lru, &mz->active_list); |
6d12e2d8 KH |
369 | } |
370 | mem_cgroup_charge_statistics(pc->mem_cgroup, pc->flags, true); | |
371 | } | |
372 | ||
8697d331 | 373 | static void __mem_cgroup_move_lists(struct page_cgroup *pc, bool active) |
66e1707b | 374 | { |
6d12e2d8 KH |
375 | int from = pc->flags & PAGE_CGROUP_FLAG_ACTIVE; |
376 | struct mem_cgroup_per_zone *mz = page_cgroup_zoneinfo(pc); | |
377 | ||
378 | if (from) | |
379 | MEM_CGROUP_ZSTAT(mz, MEM_CGROUP_ZSTAT_ACTIVE) -= 1; | |
380 | else | |
381 | MEM_CGROUP_ZSTAT(mz, MEM_CGROUP_ZSTAT_INACTIVE) -= 1; | |
382 | ||
3564c7c4 | 383 | if (active) { |
6d12e2d8 | 384 | MEM_CGROUP_ZSTAT(mz, MEM_CGROUP_ZSTAT_ACTIVE) += 1; |
3564c7c4 | 385 | pc->flags |= PAGE_CGROUP_FLAG_ACTIVE; |
1ecaab2b | 386 | list_move(&pc->lru, &mz->active_list); |
3564c7c4 | 387 | } else { |
6d12e2d8 | 388 | MEM_CGROUP_ZSTAT(mz, MEM_CGROUP_ZSTAT_INACTIVE) += 1; |
3564c7c4 | 389 | pc->flags &= ~PAGE_CGROUP_FLAG_ACTIVE; |
1ecaab2b | 390 | list_move(&pc->lru, &mz->inactive_list); |
3564c7c4 | 391 | } |
66e1707b BS |
392 | } |
393 | ||
4c4a2214 DR |
394 | int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem) |
395 | { | |
396 | int ret; | |
397 | ||
398 | task_lock(task); | |
bd845e38 | 399 | ret = task->mm && mm_match_cgroup(task->mm, mem); |
4c4a2214 DR |
400 | task_unlock(task); |
401 | return ret; | |
402 | } | |
403 | ||
66e1707b BS |
404 | /* |
405 | * This routine assumes that the appropriate zone's lru lock is already held | |
406 | */ | |
427d5416 | 407 | void mem_cgroup_move_lists(struct page *page, bool active) |
66e1707b | 408 | { |
427d5416 | 409 | struct page_cgroup *pc; |
072c56c1 KH |
410 | struct mem_cgroup_per_zone *mz; |
411 | unsigned long flags; | |
412 | ||
427d5416 | 413 | pc = page_get_page_cgroup(page); |
66e1707b BS |
414 | if (!pc) |
415 | return; | |
416 | ||
072c56c1 KH |
417 | mz = page_cgroup_zoneinfo(pc); |
418 | spin_lock_irqsave(&mz->lru_lock, flags); | |
66e1707b | 419 | __mem_cgroup_move_lists(pc, active); |
072c56c1 | 420 | spin_unlock_irqrestore(&mz->lru_lock, flags); |
66e1707b BS |
421 | } |
422 | ||
58ae83db KH |
423 | /* |
424 | * Calculate mapped_ratio under memory controller. This will be used in | |
425 | * vmscan.c for deteremining we have to reclaim mapped pages. | |
426 | */ | |
427 | int mem_cgroup_calc_mapped_ratio(struct mem_cgroup *mem) | |
428 | { | |
429 | long total, rss; | |
430 | ||
431 | /* | |
432 | * usage is recorded in bytes. But, here, we assume the number of | |
433 | * physical pages can be represented by "long" on any arch. | |
434 | */ | |
435 | total = (long) (mem->res.usage >> PAGE_SHIFT) + 1L; | |
436 | rss = (long)mem_cgroup_read_stat(&mem->stat, MEM_CGROUP_STAT_RSS); | |
437 | return (int)((rss * 100L) / total); | |
438 | } | |
5932f367 KH |
439 | /* |
440 | * This function is called from vmscan.c. In page reclaiming loop. balance | |
441 | * between active and inactive list is calculated. For memory controller | |
442 | * page reclaiming, we should use using mem_cgroup's imbalance rather than | |
443 | * zone's global lru imbalance. | |
444 | */ | |
445 | long mem_cgroup_reclaim_imbalance(struct mem_cgroup *mem) | |
446 | { | |
447 | unsigned long active, inactive; | |
448 | /* active and inactive are the number of pages. 'long' is ok.*/ | |
449 | active = mem_cgroup_get_all_zonestat(mem, MEM_CGROUP_ZSTAT_ACTIVE); | |
450 | inactive = mem_cgroup_get_all_zonestat(mem, MEM_CGROUP_ZSTAT_INACTIVE); | |
451 | return (long) (active / (inactive + 1)); | |
452 | } | |
58ae83db | 453 | |
6c48a1d0 KH |
454 | /* |
455 | * prev_priority control...this will be used in memory reclaim path. | |
456 | */ | |
457 | int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem) | |
458 | { | |
459 | return mem->prev_priority; | |
460 | } | |
461 | ||
462 | void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem, int priority) | |
463 | { | |
464 | if (priority < mem->prev_priority) | |
465 | mem->prev_priority = priority; | |
466 | } | |
467 | ||
468 | void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem, int priority) | |
469 | { | |
470 | mem->prev_priority = priority; | |
471 | } | |
472 | ||
cc38108e KH |
473 | /* |
474 | * Calculate # of pages to be scanned in this priority/zone. | |
475 | * See also vmscan.c | |
476 | * | |
477 | * priority starts from "DEF_PRIORITY" and decremented in each loop. | |
478 | * (see include/linux/mmzone.h) | |
479 | */ | |
480 | ||
481 | long mem_cgroup_calc_reclaim_active(struct mem_cgroup *mem, | |
482 | struct zone *zone, int priority) | |
483 | { | |
484 | long nr_active; | |
485 | int nid = zone->zone_pgdat->node_id; | |
486 | int zid = zone_idx(zone); | |
487 | struct mem_cgroup_per_zone *mz = mem_cgroup_zoneinfo(mem, nid, zid); | |
488 | ||
489 | nr_active = MEM_CGROUP_ZSTAT(mz, MEM_CGROUP_ZSTAT_ACTIVE); | |
490 | return (nr_active >> priority); | |
491 | } | |
492 | ||
493 | long mem_cgroup_calc_reclaim_inactive(struct mem_cgroup *mem, | |
494 | struct zone *zone, int priority) | |
495 | { | |
496 | long nr_inactive; | |
497 | int nid = zone->zone_pgdat->node_id; | |
498 | int zid = zone_idx(zone); | |
499 | struct mem_cgroup_per_zone *mz = mem_cgroup_zoneinfo(mem, nid, zid); | |
500 | ||
501 | nr_inactive = MEM_CGROUP_ZSTAT(mz, MEM_CGROUP_ZSTAT_INACTIVE); | |
502 | ||
503 | return (nr_inactive >> priority); | |
504 | } | |
505 | ||
66e1707b BS |
506 | unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan, |
507 | struct list_head *dst, | |
508 | unsigned long *scanned, int order, | |
509 | int mode, struct zone *z, | |
510 | struct mem_cgroup *mem_cont, | |
511 | int active) | |
512 | { | |
513 | unsigned long nr_taken = 0; | |
514 | struct page *page; | |
515 | unsigned long scan; | |
516 | LIST_HEAD(pc_list); | |
517 | struct list_head *src; | |
ff7283fa | 518 | struct page_cgroup *pc, *tmp; |
1ecaab2b KH |
519 | int nid = z->zone_pgdat->node_id; |
520 | int zid = zone_idx(z); | |
521 | struct mem_cgroup_per_zone *mz; | |
66e1707b | 522 | |
1ecaab2b | 523 | mz = mem_cgroup_zoneinfo(mem_cont, nid, zid); |
66e1707b | 524 | if (active) |
1ecaab2b | 525 | src = &mz->active_list; |
66e1707b | 526 | else |
1ecaab2b KH |
527 | src = &mz->inactive_list; |
528 | ||
66e1707b | 529 | |
072c56c1 | 530 | spin_lock(&mz->lru_lock); |
ff7283fa KH |
531 | scan = 0; |
532 | list_for_each_entry_safe_reverse(pc, tmp, src, lru) { | |
436c6541 | 533 | if (scan >= nr_to_scan) |
ff7283fa | 534 | break; |
66e1707b | 535 | page = pc->page; |
66e1707b | 536 | |
436c6541 | 537 | if (unlikely(!PageLRU(page))) |
ff7283fa | 538 | continue; |
ff7283fa | 539 | |
66e1707b BS |
540 | if (PageActive(page) && !active) { |
541 | __mem_cgroup_move_lists(pc, true); | |
66e1707b BS |
542 | continue; |
543 | } | |
544 | if (!PageActive(page) && active) { | |
545 | __mem_cgroup_move_lists(pc, false); | |
66e1707b BS |
546 | continue; |
547 | } | |
548 | ||
436c6541 HD |
549 | scan++; |
550 | list_move(&pc->lru, &pc_list); | |
66e1707b BS |
551 | |
552 | if (__isolate_lru_page(page, mode) == 0) { | |
553 | list_move(&page->lru, dst); | |
554 | nr_taken++; | |
555 | } | |
556 | } | |
557 | ||
558 | list_splice(&pc_list, src); | |
072c56c1 | 559 | spin_unlock(&mz->lru_lock); |
66e1707b BS |
560 | |
561 | *scanned = scan; | |
562 | return nr_taken; | |
563 | } | |
564 | ||
8a9f3ccd BS |
565 | /* |
566 | * Charge the memory controller for page usage. | |
567 | * Return | |
568 | * 0 if the charge was successful | |
569 | * < 0 if the cgroup is over its limit | |
570 | */ | |
217bc319 KH |
571 | static int mem_cgroup_charge_common(struct page *page, struct mm_struct *mm, |
572 | gfp_t gfp_mask, enum charge_type ctype) | |
8a9f3ccd BS |
573 | { |
574 | struct mem_cgroup *mem; | |
9175e031 | 575 | struct page_cgroup *pc; |
66e1707b BS |
576 | unsigned long flags; |
577 | unsigned long nr_retries = MEM_CGROUP_RECLAIM_RETRIES; | |
072c56c1 | 578 | struct mem_cgroup_per_zone *mz; |
8a9f3ccd BS |
579 | |
580 | /* | |
581 | * Should page_cgroup's go to their own slab? | |
582 | * One could optimize the performance of the charging routine | |
583 | * by saving a bit in the page_flags and using it as a lock | |
584 | * to see if the cgroup page already has a page_cgroup associated | |
585 | * with it | |
586 | */ | |
66e1707b | 587 | retry: |
82369553 HD |
588 | if (page) { |
589 | lock_page_cgroup(page); | |
590 | pc = page_get_page_cgroup(page); | |
591 | /* | |
592 | * The page_cgroup exists and | |
593 | * the page has already been accounted. | |
594 | */ | |
595 | if (pc) { | |
596 | if (unlikely(!atomic_inc_not_zero(&pc->ref_cnt))) { | |
597 | /* this page is under being uncharged ? */ | |
598 | unlock_page_cgroup(page); | |
599 | cpu_relax(); | |
600 | goto retry; | |
601 | } else { | |
602 | unlock_page_cgroup(page); | |
603 | goto done; | |
604 | } | |
9175e031 | 605 | } |
82369553 | 606 | unlock_page_cgroup(page); |
8a9f3ccd | 607 | } |
8a9f3ccd | 608 | |
e1a1cd59 | 609 | pc = kzalloc(sizeof(struct page_cgroup), gfp_mask); |
8a9f3ccd BS |
610 | if (pc == NULL) |
611 | goto err; | |
612 | ||
8a9f3ccd | 613 | /* |
3be91277 HD |
614 | * We always charge the cgroup the mm_struct belongs to. |
615 | * The mm_struct's mem_cgroup changes on task migration if the | |
8a9f3ccd BS |
616 | * thread group leader migrates. It's possible that mm is not |
617 | * set, if so charge the init_mm (happens for pagecache usage). | |
618 | */ | |
619 | if (!mm) | |
620 | mm = &init_mm; | |
621 | ||
3be91277 | 622 | rcu_read_lock(); |
8a9f3ccd BS |
623 | mem = rcu_dereference(mm->mem_cgroup); |
624 | /* | |
625 | * For every charge from the cgroup, increment reference | |
626 | * count | |
627 | */ | |
628 | css_get(&mem->css); | |
629 | rcu_read_unlock(); | |
630 | ||
631 | /* | |
632 | * If we created the page_cgroup, we should free it on exceeding | |
633 | * the cgroup limit. | |
634 | */ | |
0eea1030 | 635 | while (res_counter_charge(&mem->res, PAGE_SIZE)) { |
3be91277 HD |
636 | if (!(gfp_mask & __GFP_WAIT)) |
637 | goto out; | |
e1a1cd59 BS |
638 | |
639 | if (try_to_free_mem_cgroup_pages(mem, gfp_mask)) | |
66e1707b BS |
640 | continue; |
641 | ||
642 | /* | |
643 | * try_to_free_mem_cgroup_pages() might not give us a full | |
644 | * picture of reclaim. Some pages are reclaimed and might be | |
645 | * moved to swap cache or just unmapped from the cgroup. | |
646 | * Check the limit again to see if the reclaim reduced the | |
647 | * current usage of the cgroup before giving up | |
648 | */ | |
649 | if (res_counter_check_under_limit(&mem->res)) | |
650 | continue; | |
3be91277 HD |
651 | |
652 | if (!nr_retries--) { | |
653 | mem_cgroup_out_of_memory(mem, gfp_mask); | |
654 | goto out; | |
66e1707b | 655 | } |
3be91277 | 656 | congestion_wait(WRITE, HZ/10); |
8a9f3ccd BS |
657 | } |
658 | ||
8a9f3ccd BS |
659 | atomic_set(&pc->ref_cnt, 1); |
660 | pc->mem_cgroup = mem; | |
661 | pc->page = page; | |
3564c7c4 | 662 | pc->flags = PAGE_CGROUP_FLAG_ACTIVE; |
217bc319 KH |
663 | if (ctype == MEM_CGROUP_CHARGE_TYPE_CACHE) |
664 | pc->flags |= PAGE_CGROUP_FLAG_CACHE; | |
3be91277 | 665 | |
82369553 | 666 | if (!page || page_cgroup_assign_new_page_cgroup(page, pc)) { |
9175e031 | 667 | /* |
3be91277 HD |
668 | * Another charge has been added to this page already. |
669 | * We take lock_page_cgroup(page) again and read | |
9175e031 KH |
670 | * page->cgroup, increment refcnt.... just retry is OK. |
671 | */ | |
672 | res_counter_uncharge(&mem->res, PAGE_SIZE); | |
673 | css_put(&mem->css); | |
674 | kfree(pc); | |
82369553 HD |
675 | if (!page) |
676 | goto done; | |
9175e031 KH |
677 | goto retry; |
678 | } | |
8a9f3ccd | 679 | |
072c56c1 KH |
680 | mz = page_cgroup_zoneinfo(pc); |
681 | spin_lock_irqsave(&mz->lru_lock, flags); | |
d52aa412 | 682 | /* Update statistics vector */ |
6d12e2d8 | 683 | __mem_cgroup_add_list(pc); |
072c56c1 | 684 | spin_unlock_irqrestore(&mz->lru_lock, flags); |
66e1707b | 685 | |
8a9f3ccd | 686 | done: |
8a9f3ccd | 687 | return 0; |
3be91277 HD |
688 | out: |
689 | css_put(&mem->css); | |
8a9f3ccd | 690 | kfree(pc); |
8a9f3ccd | 691 | err: |
8a9f3ccd BS |
692 | return -ENOMEM; |
693 | } | |
694 | ||
217bc319 KH |
695 | int mem_cgroup_charge(struct page *page, struct mm_struct *mm, |
696 | gfp_t gfp_mask) | |
697 | { | |
698 | return mem_cgroup_charge_common(page, mm, gfp_mask, | |
699 | MEM_CGROUP_CHARGE_TYPE_MAPPED); | |
700 | } | |
701 | ||
8697d331 BS |
702 | /* |
703 | * See if the cached pages should be charged at all? | |
704 | */ | |
e1a1cd59 BS |
705 | int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm, |
706 | gfp_t gfp_mask) | |
8697d331 | 707 | { |
ac44d354 | 708 | int ret = 0; |
8697d331 BS |
709 | if (!mm) |
710 | mm = &init_mm; | |
711 | ||
3c541e14 | 712 | ret = mem_cgroup_charge_common(page, mm, gfp_mask, |
217bc319 | 713 | MEM_CGROUP_CHARGE_TYPE_CACHE); |
ac44d354 | 714 | return ret; |
8697d331 BS |
715 | } |
716 | ||
8a9f3ccd BS |
717 | /* |
718 | * Uncharging is always a welcome operation, we never complain, simply | |
3c541e14 | 719 | * uncharge. This routine should be called with lock_page_cgroup held |
8a9f3ccd BS |
720 | */ |
721 | void mem_cgroup_uncharge(struct page_cgroup *pc) | |
722 | { | |
723 | struct mem_cgroup *mem; | |
072c56c1 | 724 | struct mem_cgroup_per_zone *mz; |
8a9f3ccd | 725 | struct page *page; |
66e1707b | 726 | unsigned long flags; |
8a9f3ccd | 727 | |
8697d331 | 728 | /* |
3c541e14 | 729 | * Check if our page_cgroup is valid |
8697d331 | 730 | */ |
8a9f3ccd BS |
731 | if (!pc) |
732 | return; | |
733 | ||
734 | if (atomic_dec_and_test(&pc->ref_cnt)) { | |
735 | page = pc->page; | |
072c56c1 | 736 | mz = page_cgroup_zoneinfo(pc); |
9175e031 KH |
737 | /* |
738 | * get page->cgroup and clear it under lock. | |
cc847582 | 739 | * force_empty can drop page->cgroup without checking refcnt. |
9175e031 | 740 | */ |
3c541e14 | 741 | unlock_page_cgroup(page); |
9175e031 KH |
742 | if (clear_page_cgroup(page, pc) == pc) { |
743 | mem = pc->mem_cgroup; | |
744 | css_put(&mem->css); | |
745 | res_counter_uncharge(&mem->res, PAGE_SIZE); | |
072c56c1 | 746 | spin_lock_irqsave(&mz->lru_lock, flags); |
6d12e2d8 | 747 | __mem_cgroup_remove_list(pc); |
072c56c1 | 748 | spin_unlock_irqrestore(&mz->lru_lock, flags); |
9175e031 | 749 | kfree(pc); |
9175e031 | 750 | } |
3c541e14 | 751 | lock_page_cgroup(page); |
8a9f3ccd | 752 | } |
78fb7466 | 753 | } |
6d12e2d8 | 754 | |
3c541e14 BS |
755 | void mem_cgroup_uncharge_page(struct page *page) |
756 | { | |
757 | lock_page_cgroup(page); | |
758 | mem_cgroup_uncharge(page_get_page_cgroup(page)); | |
759 | unlock_page_cgroup(page); | |
760 | } | |
761 | ||
ae41be37 KH |
762 | /* |
763 | * Returns non-zero if a page (under migration) has valid page_cgroup member. | |
764 | * Refcnt of page_cgroup is incremented. | |
765 | */ | |
766 | ||
767 | int mem_cgroup_prepare_migration(struct page *page) | |
768 | { | |
769 | struct page_cgroup *pc; | |
770 | int ret = 0; | |
771 | lock_page_cgroup(page); | |
772 | pc = page_get_page_cgroup(page); | |
773 | if (pc && atomic_inc_not_zero(&pc->ref_cnt)) | |
774 | ret = 1; | |
775 | unlock_page_cgroup(page); | |
776 | return ret; | |
777 | } | |
778 | ||
779 | void mem_cgroup_end_migration(struct page *page) | |
780 | { | |
3c541e14 BS |
781 | struct page_cgroup *pc; |
782 | ||
783 | lock_page_cgroup(page); | |
784 | pc = page_get_page_cgroup(page); | |
ae41be37 | 785 | mem_cgroup_uncharge(pc); |
3c541e14 | 786 | unlock_page_cgroup(page); |
ae41be37 KH |
787 | } |
788 | /* | |
789 | * We know both *page* and *newpage* are now not-on-LRU and Pg_locked. | |
790 | * And no race with uncharge() routines because page_cgroup for *page* | |
791 | * has extra one reference by mem_cgroup_prepare_migration. | |
792 | */ | |
793 | ||
794 | void mem_cgroup_page_migration(struct page *page, struct page *newpage) | |
795 | { | |
796 | struct page_cgroup *pc; | |
6d12e2d8 KH |
797 | struct mem_cgroup *mem; |
798 | unsigned long flags; | |
072c56c1 | 799 | struct mem_cgroup_per_zone *mz; |
ae41be37 KH |
800 | retry: |
801 | pc = page_get_page_cgroup(page); | |
802 | if (!pc) | |
803 | return; | |
6d12e2d8 | 804 | mem = pc->mem_cgroup; |
072c56c1 | 805 | mz = page_cgroup_zoneinfo(pc); |
ae41be37 KH |
806 | if (clear_page_cgroup(page, pc) != pc) |
807 | goto retry; | |
072c56c1 | 808 | spin_lock_irqsave(&mz->lru_lock, flags); |
6d12e2d8 KH |
809 | |
810 | __mem_cgroup_remove_list(pc); | |
072c56c1 KH |
811 | spin_unlock_irqrestore(&mz->lru_lock, flags); |
812 | ||
ae41be37 KH |
813 | pc->page = newpage; |
814 | lock_page_cgroup(newpage); | |
815 | page_assign_page_cgroup(newpage, pc); | |
816 | unlock_page_cgroup(newpage); | |
6d12e2d8 | 817 | |
072c56c1 KH |
818 | mz = page_cgroup_zoneinfo(pc); |
819 | spin_lock_irqsave(&mz->lru_lock, flags); | |
820 | __mem_cgroup_add_list(pc); | |
821 | spin_unlock_irqrestore(&mz->lru_lock, flags); | |
ae41be37 KH |
822 | return; |
823 | } | |
78fb7466 | 824 | |
cc847582 KH |
825 | /* |
826 | * This routine traverse page_cgroup in given list and drop them all. | |
827 | * This routine ignores page_cgroup->ref_cnt. | |
828 | * *And* this routine doesn't reclaim page itself, just removes page_cgroup. | |
829 | */ | |
830 | #define FORCE_UNCHARGE_BATCH (128) | |
831 | static void | |
072c56c1 KH |
832 | mem_cgroup_force_empty_list(struct mem_cgroup *mem, |
833 | struct mem_cgroup_per_zone *mz, | |
834 | int active) | |
cc847582 KH |
835 | { |
836 | struct page_cgroup *pc; | |
837 | struct page *page; | |
838 | int count; | |
839 | unsigned long flags; | |
072c56c1 KH |
840 | struct list_head *list; |
841 | ||
842 | if (active) | |
843 | list = &mz->active_list; | |
844 | else | |
845 | list = &mz->inactive_list; | |
cc847582 | 846 | |
1ecaab2b KH |
847 | if (list_empty(list)) |
848 | return; | |
cc847582 KH |
849 | retry: |
850 | count = FORCE_UNCHARGE_BATCH; | |
072c56c1 | 851 | spin_lock_irqsave(&mz->lru_lock, flags); |
cc847582 KH |
852 | |
853 | while (--count && !list_empty(list)) { | |
854 | pc = list_entry(list->prev, struct page_cgroup, lru); | |
855 | page = pc->page; | |
856 | /* Avoid race with charge */ | |
857 | atomic_set(&pc->ref_cnt, 0); | |
858 | if (clear_page_cgroup(page, pc) == pc) { | |
859 | css_put(&mem->css); | |
860 | res_counter_uncharge(&mem->res, PAGE_SIZE); | |
6d12e2d8 | 861 | __mem_cgroup_remove_list(pc); |
cc847582 KH |
862 | kfree(pc); |
863 | } else /* being uncharged ? ...do relax */ | |
864 | break; | |
865 | } | |
072c56c1 | 866 | spin_unlock_irqrestore(&mz->lru_lock, flags); |
cc847582 KH |
867 | if (!list_empty(list)) { |
868 | cond_resched(); | |
869 | goto retry; | |
870 | } | |
871 | return; | |
872 | } | |
873 | ||
874 | /* | |
875 | * make mem_cgroup's charge to be 0 if there is no task. | |
876 | * This enables deleting this mem_cgroup. | |
877 | */ | |
878 | ||
879 | int mem_cgroup_force_empty(struct mem_cgroup *mem) | |
880 | { | |
881 | int ret = -EBUSY; | |
1ecaab2b | 882 | int node, zid; |
cc847582 KH |
883 | css_get(&mem->css); |
884 | /* | |
885 | * page reclaim code (kswapd etc..) will move pages between | |
886 | ` * active_list <-> inactive_list while we don't take a lock. | |
887 | * So, we have to do loop here until all lists are empty. | |
888 | */ | |
1ecaab2b | 889 | while (mem->res.usage > 0) { |
cc847582 KH |
890 | if (atomic_read(&mem->css.cgroup->count) > 0) |
891 | goto out; | |
1ecaab2b KH |
892 | for_each_node_state(node, N_POSSIBLE) |
893 | for (zid = 0; zid < MAX_NR_ZONES; zid++) { | |
894 | struct mem_cgroup_per_zone *mz; | |
895 | mz = mem_cgroup_zoneinfo(mem, node, zid); | |
896 | /* drop all page_cgroup in active_list */ | |
072c56c1 | 897 | mem_cgroup_force_empty_list(mem, mz, 1); |
1ecaab2b | 898 | /* drop all page_cgroup in inactive_list */ |
072c56c1 | 899 | mem_cgroup_force_empty_list(mem, mz, 0); |
1ecaab2b | 900 | } |
cc847582 KH |
901 | } |
902 | ret = 0; | |
903 | out: | |
904 | css_put(&mem->css); | |
905 | return ret; | |
906 | } | |
907 | ||
908 | ||
909 | ||
0eea1030 BS |
910 | int mem_cgroup_write_strategy(char *buf, unsigned long long *tmp) |
911 | { | |
912 | *tmp = memparse(buf, &buf); | |
913 | if (*buf != '\0') | |
914 | return -EINVAL; | |
915 | ||
916 | /* | |
917 | * Round up the value to the closest page size | |
918 | */ | |
919 | *tmp = ((*tmp + PAGE_SIZE - 1) >> PAGE_SHIFT) << PAGE_SHIFT; | |
920 | return 0; | |
921 | } | |
922 | ||
923 | static ssize_t mem_cgroup_read(struct cgroup *cont, | |
924 | struct cftype *cft, struct file *file, | |
925 | char __user *userbuf, size_t nbytes, loff_t *ppos) | |
8cdea7c0 BS |
926 | { |
927 | return res_counter_read(&mem_cgroup_from_cont(cont)->res, | |
0eea1030 BS |
928 | cft->private, userbuf, nbytes, ppos, |
929 | NULL); | |
8cdea7c0 BS |
930 | } |
931 | ||
932 | static ssize_t mem_cgroup_write(struct cgroup *cont, struct cftype *cft, | |
933 | struct file *file, const char __user *userbuf, | |
934 | size_t nbytes, loff_t *ppos) | |
935 | { | |
936 | return res_counter_write(&mem_cgroup_from_cont(cont)->res, | |
0eea1030 BS |
937 | cft->private, userbuf, nbytes, ppos, |
938 | mem_cgroup_write_strategy); | |
8cdea7c0 BS |
939 | } |
940 | ||
cc847582 KH |
941 | static ssize_t mem_force_empty_write(struct cgroup *cont, |
942 | struct cftype *cft, struct file *file, | |
943 | const char __user *userbuf, | |
944 | size_t nbytes, loff_t *ppos) | |
945 | { | |
946 | struct mem_cgroup *mem = mem_cgroup_from_cont(cont); | |
947 | int ret; | |
948 | ret = mem_cgroup_force_empty(mem); | |
949 | if (!ret) | |
950 | ret = nbytes; | |
951 | return ret; | |
952 | } | |
953 | ||
954 | /* | |
955 | * Note: This should be removed if cgroup supports write-only file. | |
956 | */ | |
957 | ||
958 | static ssize_t mem_force_empty_read(struct cgroup *cont, | |
959 | struct cftype *cft, | |
960 | struct file *file, char __user *userbuf, | |
961 | size_t nbytes, loff_t *ppos) | |
962 | { | |
963 | return -EINVAL; | |
964 | } | |
965 | ||
966 | ||
d2ceb9b7 KH |
967 | static const struct mem_cgroup_stat_desc { |
968 | const char *msg; | |
969 | u64 unit; | |
970 | } mem_cgroup_stat_desc[] = { | |
971 | [MEM_CGROUP_STAT_CACHE] = { "cache", PAGE_SIZE, }, | |
972 | [MEM_CGROUP_STAT_RSS] = { "rss", PAGE_SIZE, }, | |
973 | }; | |
974 | ||
975 | static int mem_control_stat_show(struct seq_file *m, void *arg) | |
976 | { | |
977 | struct cgroup *cont = m->private; | |
978 | struct mem_cgroup *mem_cont = mem_cgroup_from_cont(cont); | |
979 | struct mem_cgroup_stat *stat = &mem_cont->stat; | |
980 | int i; | |
981 | ||
982 | for (i = 0; i < ARRAY_SIZE(stat->cpustat[0].count); i++) { | |
983 | s64 val; | |
984 | ||
985 | val = mem_cgroup_read_stat(stat, i); | |
986 | val *= mem_cgroup_stat_desc[i].unit; | |
987 | seq_printf(m, "%s %lld\n", mem_cgroup_stat_desc[i].msg, | |
988 | (long long)val); | |
989 | } | |
6d12e2d8 KH |
990 | /* showing # of active pages */ |
991 | { | |
992 | unsigned long active, inactive; | |
993 | ||
994 | inactive = mem_cgroup_get_all_zonestat(mem_cont, | |
995 | MEM_CGROUP_ZSTAT_INACTIVE); | |
996 | active = mem_cgroup_get_all_zonestat(mem_cont, | |
997 | MEM_CGROUP_ZSTAT_ACTIVE); | |
998 | seq_printf(m, "active %ld\n", (active) * PAGE_SIZE); | |
999 | seq_printf(m, "inactive %ld\n", (inactive) * PAGE_SIZE); | |
1000 | } | |
d2ceb9b7 KH |
1001 | return 0; |
1002 | } | |
1003 | ||
1004 | static const struct file_operations mem_control_stat_file_operations = { | |
1005 | .read = seq_read, | |
1006 | .llseek = seq_lseek, | |
1007 | .release = single_release, | |
1008 | }; | |
1009 | ||
1010 | static int mem_control_stat_open(struct inode *unused, struct file *file) | |
1011 | { | |
1012 | /* XXX __d_cont */ | |
1013 | struct cgroup *cont = file->f_dentry->d_parent->d_fsdata; | |
1014 | ||
1015 | file->f_op = &mem_control_stat_file_operations; | |
1016 | return single_open(file, mem_control_stat_show, cont); | |
1017 | } | |
1018 | ||
1019 | ||
1020 | ||
8cdea7c0 BS |
1021 | static struct cftype mem_cgroup_files[] = { |
1022 | { | |
0eea1030 | 1023 | .name = "usage_in_bytes", |
8cdea7c0 BS |
1024 | .private = RES_USAGE, |
1025 | .read = mem_cgroup_read, | |
1026 | }, | |
1027 | { | |
0eea1030 | 1028 | .name = "limit_in_bytes", |
8cdea7c0 BS |
1029 | .private = RES_LIMIT, |
1030 | .write = mem_cgroup_write, | |
1031 | .read = mem_cgroup_read, | |
1032 | }, | |
1033 | { | |
1034 | .name = "failcnt", | |
1035 | .private = RES_FAILCNT, | |
1036 | .read = mem_cgroup_read, | |
1037 | }, | |
cc847582 KH |
1038 | { |
1039 | .name = "force_empty", | |
1040 | .write = mem_force_empty_write, | |
1041 | .read = mem_force_empty_read, | |
1042 | }, | |
d2ceb9b7 KH |
1043 | { |
1044 | .name = "stat", | |
1045 | .open = mem_control_stat_open, | |
1046 | }, | |
8cdea7c0 BS |
1047 | }; |
1048 | ||
6d12e2d8 KH |
1049 | static int alloc_mem_cgroup_per_zone_info(struct mem_cgroup *mem, int node) |
1050 | { | |
1051 | struct mem_cgroup_per_node *pn; | |
1ecaab2b KH |
1052 | struct mem_cgroup_per_zone *mz; |
1053 | int zone; | |
1054 | /* | |
1055 | * This routine is called against possible nodes. | |
1056 | * But it's BUG to call kmalloc() against offline node. | |
1057 | * | |
1058 | * TODO: this routine can waste much memory for nodes which will | |
1059 | * never be onlined. It's better to use memory hotplug callback | |
1060 | * function. | |
1061 | */ | |
1062 | if (node_state(node, N_HIGH_MEMORY)) | |
1063 | pn = kmalloc_node(sizeof(*pn), GFP_KERNEL, node); | |
1064 | else | |
1065 | pn = kmalloc(sizeof(*pn), GFP_KERNEL); | |
6d12e2d8 KH |
1066 | if (!pn) |
1067 | return 1; | |
1ecaab2b | 1068 | |
6d12e2d8 KH |
1069 | mem->info.nodeinfo[node] = pn; |
1070 | memset(pn, 0, sizeof(*pn)); | |
1ecaab2b KH |
1071 | |
1072 | for (zone = 0; zone < MAX_NR_ZONES; zone++) { | |
1073 | mz = &pn->zoneinfo[zone]; | |
1074 | INIT_LIST_HEAD(&mz->active_list); | |
1075 | INIT_LIST_HEAD(&mz->inactive_list); | |
072c56c1 | 1076 | spin_lock_init(&mz->lru_lock); |
1ecaab2b | 1077 | } |
6d12e2d8 KH |
1078 | return 0; |
1079 | } | |
1080 | ||
1ecaab2b KH |
1081 | static void free_mem_cgroup_per_zone_info(struct mem_cgroup *mem, int node) |
1082 | { | |
1083 | kfree(mem->info.nodeinfo[node]); | |
1084 | } | |
1085 | ||
1086 | ||
78fb7466 PE |
1087 | static struct mem_cgroup init_mem_cgroup; |
1088 | ||
8cdea7c0 BS |
1089 | static struct cgroup_subsys_state * |
1090 | mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont) | |
1091 | { | |
1092 | struct mem_cgroup *mem; | |
6d12e2d8 | 1093 | int node; |
8cdea7c0 | 1094 | |
78fb7466 PE |
1095 | if (unlikely((cont->parent) == NULL)) { |
1096 | mem = &init_mem_cgroup; | |
1097 | init_mm.mem_cgroup = mem; | |
1098 | } else | |
1099 | mem = kzalloc(sizeof(struct mem_cgroup), GFP_KERNEL); | |
1100 | ||
1101 | if (mem == NULL) | |
2dda81ca | 1102 | return ERR_PTR(-ENOMEM); |
8cdea7c0 BS |
1103 | |
1104 | res_counter_init(&mem->res); | |
1ecaab2b | 1105 | |
6d12e2d8 KH |
1106 | memset(&mem->info, 0, sizeof(mem->info)); |
1107 | ||
1108 | for_each_node_state(node, N_POSSIBLE) | |
1109 | if (alloc_mem_cgroup_per_zone_info(mem, node)) | |
1110 | goto free_out; | |
1111 | ||
8cdea7c0 | 1112 | return &mem->css; |
6d12e2d8 KH |
1113 | free_out: |
1114 | for_each_node_state(node, N_POSSIBLE) | |
1ecaab2b | 1115 | free_mem_cgroup_per_zone_info(mem, node); |
6d12e2d8 KH |
1116 | if (cont->parent != NULL) |
1117 | kfree(mem); | |
2dda81ca | 1118 | return ERR_PTR(-ENOMEM); |
8cdea7c0 BS |
1119 | } |
1120 | ||
df878fb0 KH |
1121 | static void mem_cgroup_pre_destroy(struct cgroup_subsys *ss, |
1122 | struct cgroup *cont) | |
1123 | { | |
1124 | struct mem_cgroup *mem = mem_cgroup_from_cont(cont); | |
1125 | mem_cgroup_force_empty(mem); | |
1126 | } | |
1127 | ||
8cdea7c0 BS |
1128 | static void mem_cgroup_destroy(struct cgroup_subsys *ss, |
1129 | struct cgroup *cont) | |
1130 | { | |
6d12e2d8 KH |
1131 | int node; |
1132 | struct mem_cgroup *mem = mem_cgroup_from_cont(cont); | |
1133 | ||
1134 | for_each_node_state(node, N_POSSIBLE) | |
1ecaab2b | 1135 | free_mem_cgroup_per_zone_info(mem, node); |
6d12e2d8 | 1136 | |
8cdea7c0 BS |
1137 | kfree(mem_cgroup_from_cont(cont)); |
1138 | } | |
1139 | ||
1140 | static int mem_cgroup_populate(struct cgroup_subsys *ss, | |
1141 | struct cgroup *cont) | |
1142 | { | |
1143 | return cgroup_add_files(cont, ss, mem_cgroup_files, | |
1144 | ARRAY_SIZE(mem_cgroup_files)); | |
1145 | } | |
1146 | ||
67e465a7 BS |
1147 | static void mem_cgroup_move_task(struct cgroup_subsys *ss, |
1148 | struct cgroup *cont, | |
1149 | struct cgroup *old_cont, | |
1150 | struct task_struct *p) | |
1151 | { | |
1152 | struct mm_struct *mm; | |
1153 | struct mem_cgroup *mem, *old_mem; | |
1154 | ||
1155 | mm = get_task_mm(p); | |
1156 | if (mm == NULL) | |
1157 | return; | |
1158 | ||
1159 | mem = mem_cgroup_from_cont(cont); | |
1160 | old_mem = mem_cgroup_from_cont(old_cont); | |
1161 | ||
1162 | if (mem == old_mem) | |
1163 | goto out; | |
1164 | ||
1165 | /* | |
1166 | * Only thread group leaders are allowed to migrate, the mm_struct is | |
1167 | * in effect owned by the leader | |
1168 | */ | |
1169 | if (p->tgid != p->pid) | |
1170 | goto out; | |
1171 | ||
1172 | css_get(&mem->css); | |
1173 | rcu_assign_pointer(mm->mem_cgroup, mem); | |
1174 | css_put(&old_mem->css); | |
1175 | ||
1176 | out: | |
1177 | mmput(mm); | |
1178 | return; | |
1179 | } | |
1180 | ||
8cdea7c0 BS |
1181 | struct cgroup_subsys mem_cgroup_subsys = { |
1182 | .name = "memory", | |
1183 | .subsys_id = mem_cgroup_subsys_id, | |
1184 | .create = mem_cgroup_create, | |
df878fb0 | 1185 | .pre_destroy = mem_cgroup_pre_destroy, |
8cdea7c0 BS |
1186 | .destroy = mem_cgroup_destroy, |
1187 | .populate = mem_cgroup_populate, | |
67e465a7 | 1188 | .attach = mem_cgroup_move_task, |
6d12e2d8 | 1189 | .early_init = 0, |
8cdea7c0 | 1190 | }; |