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1 | /* memcontrol.h - Memory Controller | |
2 | * | |
3 | * Copyright IBM Corporation, 2007 | |
4 | * Author Balbir Singh <balbir@linux.vnet.ibm.com> | |
5 | * | |
6 | * Copyright 2007 OpenVZ SWsoft Inc | |
7 | * Author: Pavel Emelianov <xemul@openvz.org> | |
8 | * | |
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 | #ifndef _LINUX_MEMCONTROL_H | |
21 | #define _LINUX_MEMCONTROL_H | |
22 | #include <linux/cgroup.h> | |
23 | #include <linux/vm_event_item.h> | |
24 | #include <linux/hardirq.h> | |
25 | #include <linux/jump_label.h> | |
26 | ||
27 | struct mem_cgroup; | |
28 | struct page_cgroup; | |
29 | struct page; | |
30 | struct mm_struct; | |
31 | struct kmem_cache; | |
32 | ||
33 | /* | |
34 | * The corresponding mem_cgroup_stat_names is defined in mm/memcontrol.c, | |
35 | * These two lists should keep in accord with each other. | |
36 | */ | |
37 | enum mem_cgroup_stat_index { | |
38 | /* | |
39 | * For MEM_CONTAINER_TYPE_ALL, usage = pagecache + rss. | |
40 | */ | |
41 | MEM_CGROUP_STAT_CACHE, /* # of pages charged as cache */ | |
42 | MEM_CGROUP_STAT_RSS, /* # of pages charged as anon rss */ | |
43 | MEM_CGROUP_STAT_RSS_HUGE, /* # of pages charged as anon huge */ | |
44 | MEM_CGROUP_STAT_FILE_MAPPED, /* # of pages charged as file rss */ | |
45 | MEM_CGROUP_STAT_WRITEBACK, /* # of pages under writeback */ | |
46 | MEM_CGROUP_STAT_SWAP, /* # of pages, swapped out */ | |
47 | MEM_CGROUP_STAT_NSTATS, | |
48 | }; | |
49 | ||
50 | struct mem_cgroup_reclaim_cookie { | |
51 | struct zone *zone; | |
52 | int priority; | |
53 | unsigned int generation; | |
54 | }; | |
55 | ||
56 | #ifdef CONFIG_MEMCG | |
57 | /* | |
58 | * All "charge" functions with gfp_mask should use GFP_KERNEL or | |
59 | * (gfp_mask & GFP_RECLAIM_MASK). In current implementatin, memcg doesn't | |
60 | * alloc memory but reclaims memory from all available zones. So, "where I want | |
61 | * memory from" bits of gfp_mask has no meaning. So any bits of that field is | |
62 | * available but adding a rule is better. charge functions' gfp_mask should | |
63 | * be set to GFP_KERNEL or gfp_mask & GFP_RECLAIM_MASK for avoiding ambiguous | |
64 | * codes. | |
65 | * (Of course, if memcg does memory allocation in future, GFP_KERNEL is sane.) | |
66 | */ | |
67 | ||
68 | extern int mem_cgroup_charge_anon(struct page *page, struct mm_struct *mm, | |
69 | gfp_t gfp_mask); | |
70 | /* for swap handling */ | |
71 | extern int mem_cgroup_try_charge_swapin(struct mm_struct *mm, | |
72 | struct page *page, gfp_t mask, struct mem_cgroup **memcgp); | |
73 | extern void mem_cgroup_commit_charge_swapin(struct page *page, | |
74 | struct mem_cgroup *memcg); | |
75 | extern void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *memcg); | |
76 | ||
77 | extern int mem_cgroup_charge_file(struct page *page, struct mm_struct *mm, | |
78 | gfp_t gfp_mask); | |
79 | ||
80 | struct lruvec *mem_cgroup_zone_lruvec(struct zone *, struct mem_cgroup *); | |
81 | struct lruvec *mem_cgroup_page_lruvec(struct page *, struct zone *); | |
82 | ||
83 | /* For coalescing uncharge for reducing memcg' overhead*/ | |
84 | extern void mem_cgroup_uncharge_start(void); | |
85 | extern void mem_cgroup_uncharge_end(void); | |
86 | ||
87 | extern void mem_cgroup_uncharge_page(struct page *page); | |
88 | extern void mem_cgroup_uncharge_cache_page(struct page *page); | |
89 | ||
90 | bool __mem_cgroup_same_or_subtree(const struct mem_cgroup *root_memcg, | |
91 | struct mem_cgroup *memcg); | |
92 | bool task_in_mem_cgroup(struct task_struct *task, | |
93 | const struct mem_cgroup *memcg); | |
94 | ||
95 | extern struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page); | |
96 | extern struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p); | |
97 | ||
98 | extern struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg); | |
99 | extern struct mem_cgroup *mem_cgroup_from_css(struct cgroup_subsys_state *css); | |
100 | ||
101 | static inline | |
102 | bool mm_match_cgroup(const struct mm_struct *mm, const struct mem_cgroup *memcg) | |
103 | { | |
104 | struct mem_cgroup *task_memcg; | |
105 | bool match; | |
106 | ||
107 | rcu_read_lock(); | |
108 | task_memcg = mem_cgroup_from_task(rcu_dereference(mm->owner)); | |
109 | match = __mem_cgroup_same_or_subtree(memcg, task_memcg); | |
110 | rcu_read_unlock(); | |
111 | return match; | |
112 | } | |
113 | ||
114 | extern struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *memcg); | |
115 | ||
116 | extern void | |
117 | mem_cgroup_prepare_migration(struct page *page, struct page *newpage, | |
118 | struct mem_cgroup **memcgp); | |
119 | extern void mem_cgroup_end_migration(struct mem_cgroup *memcg, | |
120 | struct page *oldpage, struct page *newpage, bool migration_ok); | |
121 | ||
122 | struct mem_cgroup *mem_cgroup_iter(struct mem_cgroup *, | |
123 | struct mem_cgroup *, | |
124 | struct mem_cgroup_reclaim_cookie *); | |
125 | void mem_cgroup_iter_break(struct mem_cgroup *, struct mem_cgroup *); | |
126 | ||
127 | /* | |
128 | * For memory reclaim. | |
129 | */ | |
130 | int mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec); | |
131 | int mem_cgroup_select_victim_node(struct mem_cgroup *memcg); | |
132 | unsigned long mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list); | |
133 | void mem_cgroup_update_lru_size(struct lruvec *, enum lru_list, int); | |
134 | extern void mem_cgroup_print_oom_info(struct mem_cgroup *memcg, | |
135 | struct task_struct *p); | |
136 | extern void mem_cgroup_replace_page_cache(struct page *oldpage, | |
137 | struct page *newpage); | |
138 | ||
139 | static inline void mem_cgroup_oom_enable(void) | |
140 | { | |
141 | WARN_ON(current->memcg_oom.may_oom); | |
142 | current->memcg_oom.may_oom = 1; | |
143 | } | |
144 | ||
145 | static inline void mem_cgroup_oom_disable(void) | |
146 | { | |
147 | WARN_ON(!current->memcg_oom.may_oom); | |
148 | current->memcg_oom.may_oom = 0; | |
149 | } | |
150 | ||
151 | static inline bool task_in_memcg_oom(struct task_struct *p) | |
152 | { | |
153 | return p->memcg_oom.memcg; | |
154 | } | |
155 | ||
156 | bool mem_cgroup_oom_synchronize(bool wait); | |
157 | ||
158 | #ifdef CONFIG_MEMCG_SWAP | |
159 | extern int do_swap_account; | |
160 | #endif | |
161 | ||
162 | static inline bool mem_cgroup_disabled(void) | |
163 | { | |
164 | if (memory_cgrp_subsys.disabled) | |
165 | return true; | |
166 | return false; | |
167 | } | |
168 | ||
169 | void __mem_cgroup_begin_update_page_stat(struct page *page, bool *locked, | |
170 | unsigned long *flags); | |
171 | ||
172 | extern atomic_t memcg_moving; | |
173 | ||
174 | static inline void mem_cgroup_begin_update_page_stat(struct page *page, | |
175 | bool *locked, unsigned long *flags) | |
176 | { | |
177 | if (mem_cgroup_disabled()) | |
178 | return; | |
179 | rcu_read_lock(); | |
180 | *locked = false; | |
181 | if (atomic_read(&memcg_moving)) | |
182 | __mem_cgroup_begin_update_page_stat(page, locked, flags); | |
183 | } | |
184 | ||
185 | void __mem_cgroup_end_update_page_stat(struct page *page, | |
186 | unsigned long *flags); | |
187 | static inline void mem_cgroup_end_update_page_stat(struct page *page, | |
188 | bool *locked, unsigned long *flags) | |
189 | { | |
190 | if (mem_cgroup_disabled()) | |
191 | return; | |
192 | if (*locked) | |
193 | __mem_cgroup_end_update_page_stat(page, flags); | |
194 | rcu_read_unlock(); | |
195 | } | |
196 | ||
197 | void mem_cgroup_update_page_stat(struct page *page, | |
198 | enum mem_cgroup_stat_index idx, | |
199 | int val); | |
200 | ||
201 | static inline void mem_cgroup_inc_page_stat(struct page *page, | |
202 | enum mem_cgroup_stat_index idx) | |
203 | { | |
204 | mem_cgroup_update_page_stat(page, idx, 1); | |
205 | } | |
206 | ||
207 | static inline void mem_cgroup_dec_page_stat(struct page *page, | |
208 | enum mem_cgroup_stat_index idx) | |
209 | { | |
210 | mem_cgroup_update_page_stat(page, idx, -1); | |
211 | } | |
212 | ||
213 | unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order, | |
214 | gfp_t gfp_mask, | |
215 | unsigned long *total_scanned); | |
216 | ||
217 | void __mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx); | |
218 | static inline void mem_cgroup_count_vm_event(struct mm_struct *mm, | |
219 | enum vm_event_item idx) | |
220 | { | |
221 | if (mem_cgroup_disabled()) | |
222 | return; | |
223 | __mem_cgroup_count_vm_event(mm, idx); | |
224 | } | |
225 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
226 | void mem_cgroup_split_huge_fixup(struct page *head); | |
227 | #endif | |
228 | ||
229 | #ifdef CONFIG_DEBUG_VM | |
230 | bool mem_cgroup_bad_page_check(struct page *page); | |
231 | void mem_cgroup_print_bad_page(struct page *page); | |
232 | #endif | |
233 | #else /* CONFIG_MEMCG */ | |
234 | struct mem_cgroup; | |
235 | ||
236 | static inline int mem_cgroup_charge_anon(struct page *page, | |
237 | struct mm_struct *mm, gfp_t gfp_mask) | |
238 | { | |
239 | return 0; | |
240 | } | |
241 | ||
242 | static inline int mem_cgroup_charge_file(struct page *page, | |
243 | struct mm_struct *mm, gfp_t gfp_mask) | |
244 | { | |
245 | return 0; | |
246 | } | |
247 | ||
248 | static inline int mem_cgroup_try_charge_swapin(struct mm_struct *mm, | |
249 | struct page *page, gfp_t gfp_mask, struct mem_cgroup **memcgp) | |
250 | { | |
251 | return 0; | |
252 | } | |
253 | ||
254 | static inline void mem_cgroup_commit_charge_swapin(struct page *page, | |
255 | struct mem_cgroup *memcg) | |
256 | { | |
257 | } | |
258 | ||
259 | static inline void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *memcg) | |
260 | { | |
261 | } | |
262 | ||
263 | static inline void mem_cgroup_uncharge_start(void) | |
264 | { | |
265 | } | |
266 | ||
267 | static inline void mem_cgroup_uncharge_end(void) | |
268 | { | |
269 | } | |
270 | ||
271 | static inline void mem_cgroup_uncharge_page(struct page *page) | |
272 | { | |
273 | } | |
274 | ||
275 | static inline void mem_cgroup_uncharge_cache_page(struct page *page) | |
276 | { | |
277 | } | |
278 | ||
279 | static inline struct lruvec *mem_cgroup_zone_lruvec(struct zone *zone, | |
280 | struct mem_cgroup *memcg) | |
281 | { | |
282 | return &zone->lruvec; | |
283 | } | |
284 | ||
285 | static inline struct lruvec *mem_cgroup_page_lruvec(struct page *page, | |
286 | struct zone *zone) | |
287 | { | |
288 | return &zone->lruvec; | |
289 | } | |
290 | ||
291 | static inline struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page) | |
292 | { | |
293 | return NULL; | |
294 | } | |
295 | ||
296 | static inline bool mm_match_cgroup(struct mm_struct *mm, | |
297 | struct mem_cgroup *memcg) | |
298 | { | |
299 | return true; | |
300 | } | |
301 | ||
302 | static inline bool task_in_mem_cgroup(struct task_struct *task, | |
303 | const struct mem_cgroup *memcg) | |
304 | { | |
305 | return true; | |
306 | } | |
307 | ||
308 | static inline struct cgroup_subsys_state | |
309 | *mem_cgroup_css(struct mem_cgroup *memcg) | |
310 | { | |
311 | return NULL; | |
312 | } | |
313 | ||
314 | static inline void | |
315 | mem_cgroup_prepare_migration(struct page *page, struct page *newpage, | |
316 | struct mem_cgroup **memcgp) | |
317 | { | |
318 | } | |
319 | ||
320 | static inline void mem_cgroup_end_migration(struct mem_cgroup *memcg, | |
321 | struct page *oldpage, struct page *newpage, bool migration_ok) | |
322 | { | |
323 | } | |
324 | ||
325 | static inline struct mem_cgroup * | |
326 | mem_cgroup_iter(struct mem_cgroup *root, | |
327 | struct mem_cgroup *prev, | |
328 | struct mem_cgroup_reclaim_cookie *reclaim) | |
329 | { | |
330 | return NULL; | |
331 | } | |
332 | ||
333 | static inline void mem_cgroup_iter_break(struct mem_cgroup *root, | |
334 | struct mem_cgroup *prev) | |
335 | { | |
336 | } | |
337 | ||
338 | static inline bool mem_cgroup_disabled(void) | |
339 | { | |
340 | return true; | |
341 | } | |
342 | ||
343 | static inline int | |
344 | mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec) | |
345 | { | |
346 | return 1; | |
347 | } | |
348 | ||
349 | static inline unsigned long | |
350 | mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list lru) | |
351 | { | |
352 | return 0; | |
353 | } | |
354 | ||
355 | static inline void | |
356 | mem_cgroup_update_lru_size(struct lruvec *lruvec, enum lru_list lru, | |
357 | int increment) | |
358 | { | |
359 | } | |
360 | ||
361 | static inline void | |
362 | mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p) | |
363 | { | |
364 | } | |
365 | ||
366 | static inline void mem_cgroup_begin_update_page_stat(struct page *page, | |
367 | bool *locked, unsigned long *flags) | |
368 | { | |
369 | } | |
370 | ||
371 | static inline void mem_cgroup_end_update_page_stat(struct page *page, | |
372 | bool *locked, unsigned long *flags) | |
373 | { | |
374 | } | |
375 | ||
376 | static inline void mem_cgroup_oom_enable(void) | |
377 | { | |
378 | } | |
379 | ||
380 | static inline void mem_cgroup_oom_disable(void) | |
381 | { | |
382 | } | |
383 | ||
384 | static inline bool task_in_memcg_oom(struct task_struct *p) | |
385 | { | |
386 | return false; | |
387 | } | |
388 | ||
389 | static inline bool mem_cgroup_oom_synchronize(bool wait) | |
390 | { | |
391 | return false; | |
392 | } | |
393 | ||
394 | static inline void mem_cgroup_inc_page_stat(struct page *page, | |
395 | enum mem_cgroup_stat_index idx) | |
396 | { | |
397 | } | |
398 | ||
399 | static inline void mem_cgroup_dec_page_stat(struct page *page, | |
400 | enum mem_cgroup_stat_index idx) | |
401 | { | |
402 | } | |
403 | ||
404 | static inline | |
405 | unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order, | |
406 | gfp_t gfp_mask, | |
407 | unsigned long *total_scanned) | |
408 | { | |
409 | return 0; | |
410 | } | |
411 | ||
412 | static inline void mem_cgroup_split_huge_fixup(struct page *head) | |
413 | { | |
414 | } | |
415 | ||
416 | static inline | |
417 | void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx) | |
418 | { | |
419 | } | |
420 | static inline void mem_cgroup_replace_page_cache(struct page *oldpage, | |
421 | struct page *newpage) | |
422 | { | |
423 | } | |
424 | #endif /* CONFIG_MEMCG */ | |
425 | ||
426 | #if !defined(CONFIG_MEMCG) || !defined(CONFIG_DEBUG_VM) | |
427 | static inline bool | |
428 | mem_cgroup_bad_page_check(struct page *page) | |
429 | { | |
430 | return false; | |
431 | } | |
432 | ||
433 | static inline void | |
434 | mem_cgroup_print_bad_page(struct page *page) | |
435 | { | |
436 | } | |
437 | #endif | |
438 | ||
439 | enum { | |
440 | UNDER_LIMIT, | |
441 | SOFT_LIMIT, | |
442 | OVER_LIMIT, | |
443 | }; | |
444 | ||
445 | struct sock; | |
446 | #if defined(CONFIG_INET) && defined(CONFIG_MEMCG_KMEM) | |
447 | void sock_update_memcg(struct sock *sk); | |
448 | void sock_release_memcg(struct sock *sk); | |
449 | #else | |
450 | static inline void sock_update_memcg(struct sock *sk) | |
451 | { | |
452 | } | |
453 | static inline void sock_release_memcg(struct sock *sk) | |
454 | { | |
455 | } | |
456 | #endif /* CONFIG_INET && CONFIG_MEMCG_KMEM */ | |
457 | ||
458 | #ifdef CONFIG_MEMCG_KMEM | |
459 | extern struct static_key memcg_kmem_enabled_key; | |
460 | ||
461 | extern int memcg_limited_groups_array_size; | |
462 | ||
463 | /* | |
464 | * Helper macro to loop through all memcg-specific caches. Callers must still | |
465 | * check if the cache is valid (it is either valid or NULL). | |
466 | * the slab_mutex must be held when looping through those caches | |
467 | */ | |
468 | #define for_each_memcg_cache_index(_idx) \ | |
469 | for ((_idx) = 0; (_idx) < memcg_limited_groups_array_size; (_idx)++) | |
470 | ||
471 | static inline bool memcg_kmem_enabled(void) | |
472 | { | |
473 | return static_key_false(&memcg_kmem_enabled_key); | |
474 | } | |
475 | ||
476 | /* | |
477 | * In general, we'll do everything in our power to not incur in any overhead | |
478 | * for non-memcg users for the kmem functions. Not even a function call, if we | |
479 | * can avoid it. | |
480 | * | |
481 | * Therefore, we'll inline all those functions so that in the best case, we'll | |
482 | * see that kmemcg is off for everybody and proceed quickly. If it is on, | |
483 | * we'll still do most of the flag checking inline. We check a lot of | |
484 | * conditions, but because they are pretty simple, they are expected to be | |
485 | * fast. | |
486 | */ | |
487 | bool __memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg, | |
488 | int order); | |
489 | void __memcg_kmem_commit_charge(struct page *page, | |
490 | struct mem_cgroup *memcg, int order); | |
491 | void __memcg_kmem_uncharge_pages(struct page *page, int order); | |
492 | ||
493 | int memcg_cache_id(struct mem_cgroup *memcg); | |
494 | ||
495 | char *memcg_create_cache_name(struct mem_cgroup *memcg, | |
496 | struct kmem_cache *root_cache); | |
497 | int memcg_alloc_cache_params(struct mem_cgroup *memcg, struct kmem_cache *s, | |
498 | struct kmem_cache *root_cache); | |
499 | void memcg_free_cache_params(struct kmem_cache *s); | |
500 | void memcg_register_cache(struct kmem_cache *s); | |
501 | void memcg_unregister_cache(struct kmem_cache *s); | |
502 | ||
503 | int memcg_update_cache_size(struct kmem_cache *s, int num_groups); | |
504 | void memcg_update_array_size(int num_groups); | |
505 | ||
506 | struct kmem_cache * | |
507 | __memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp); | |
508 | ||
509 | void mem_cgroup_destroy_cache(struct kmem_cache *cachep); | |
510 | int __kmem_cache_destroy_memcg_children(struct kmem_cache *s); | |
511 | ||
512 | /** | |
513 | * memcg_kmem_newpage_charge: verify if a new kmem allocation is allowed. | |
514 | * @gfp: the gfp allocation flags. | |
515 | * @memcg: a pointer to the memcg this was charged against. | |
516 | * @order: allocation order. | |
517 | * | |
518 | * returns true if the memcg where the current task belongs can hold this | |
519 | * allocation. | |
520 | * | |
521 | * We return true automatically if this allocation is not to be accounted to | |
522 | * any memcg. | |
523 | */ | |
524 | static inline bool | |
525 | memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg, int order) | |
526 | { | |
527 | if (!memcg_kmem_enabled()) | |
528 | return true; | |
529 | ||
530 | /* | |
531 | * __GFP_NOFAIL allocations will move on even if charging is not | |
532 | * possible. Therefore we don't even try, and have this allocation | |
533 | * unaccounted. We could in theory charge it with | |
534 | * res_counter_charge_nofail, but we hope those allocations are rare, | |
535 | * and won't be worth the trouble. | |
536 | */ | |
537 | if (!(gfp & __GFP_KMEMCG) || (gfp & __GFP_NOFAIL)) | |
538 | return true; | |
539 | if (in_interrupt() || (!current->mm) || (current->flags & PF_KTHREAD)) | |
540 | return true; | |
541 | ||
542 | /* If the test is dying, just let it go. */ | |
543 | if (unlikely(fatal_signal_pending(current))) | |
544 | return true; | |
545 | ||
546 | return __memcg_kmem_newpage_charge(gfp, memcg, order); | |
547 | } | |
548 | ||
549 | /** | |
550 | * memcg_kmem_uncharge_pages: uncharge pages from memcg | |
551 | * @page: pointer to struct page being freed | |
552 | * @order: allocation order. | |
553 | * | |
554 | * there is no need to specify memcg here, since it is embedded in page_cgroup | |
555 | */ | |
556 | static inline void | |
557 | memcg_kmem_uncharge_pages(struct page *page, int order) | |
558 | { | |
559 | if (memcg_kmem_enabled()) | |
560 | __memcg_kmem_uncharge_pages(page, order); | |
561 | } | |
562 | ||
563 | /** | |
564 | * memcg_kmem_commit_charge: embeds correct memcg in a page | |
565 | * @page: pointer to struct page recently allocated | |
566 | * @memcg: the memcg structure we charged against | |
567 | * @order: allocation order. | |
568 | * | |
569 | * Needs to be called after memcg_kmem_newpage_charge, regardless of success or | |
570 | * failure of the allocation. if @page is NULL, this function will revert the | |
571 | * charges. Otherwise, it will commit the memcg given by @memcg to the | |
572 | * corresponding page_cgroup. | |
573 | */ | |
574 | static inline void | |
575 | memcg_kmem_commit_charge(struct page *page, struct mem_cgroup *memcg, int order) | |
576 | { | |
577 | if (memcg_kmem_enabled() && memcg) | |
578 | __memcg_kmem_commit_charge(page, memcg, order); | |
579 | } | |
580 | ||
581 | /** | |
582 | * memcg_kmem_get_cache: selects the correct per-memcg cache for allocation | |
583 | * @cachep: the original global kmem cache | |
584 | * @gfp: allocation flags. | |
585 | * | |
586 | * This function assumes that the task allocating, which determines the memcg | |
587 | * in the page allocator, belongs to the same cgroup throughout the whole | |
588 | * process. Misacounting can happen if the task calls memcg_kmem_get_cache() | |
589 | * while belonging to a cgroup, and later on changes. This is considered | |
590 | * acceptable, and should only happen upon task migration. | |
591 | * | |
592 | * Before the cache is created by the memcg core, there is also a possible | |
593 | * imbalance: the task belongs to a memcg, but the cache being allocated from | |
594 | * is the global cache, since the child cache is not yet guaranteed to be | |
595 | * ready. This case is also fine, since in this case the GFP_KMEMCG will not be | |
596 | * passed and the page allocator will not attempt any cgroup accounting. | |
597 | */ | |
598 | static __always_inline struct kmem_cache * | |
599 | memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp) | |
600 | { | |
601 | if (!memcg_kmem_enabled()) | |
602 | return cachep; | |
603 | if (gfp & __GFP_NOFAIL) | |
604 | return cachep; | |
605 | if (in_interrupt() || (!current->mm) || (current->flags & PF_KTHREAD)) | |
606 | return cachep; | |
607 | if (unlikely(fatal_signal_pending(current))) | |
608 | return cachep; | |
609 | ||
610 | return __memcg_kmem_get_cache(cachep, gfp); | |
611 | } | |
612 | #else | |
613 | #define for_each_memcg_cache_index(_idx) \ | |
614 | for (; NULL; ) | |
615 | ||
616 | static inline bool memcg_kmem_enabled(void) | |
617 | { | |
618 | return false; | |
619 | } | |
620 | ||
621 | static inline bool | |
622 | memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg, int order) | |
623 | { | |
624 | return true; | |
625 | } | |
626 | ||
627 | static inline void memcg_kmem_uncharge_pages(struct page *page, int order) | |
628 | { | |
629 | } | |
630 | ||
631 | static inline void | |
632 | memcg_kmem_commit_charge(struct page *page, struct mem_cgroup *memcg, int order) | |
633 | { | |
634 | } | |
635 | ||
636 | static inline int memcg_cache_id(struct mem_cgroup *memcg) | |
637 | { | |
638 | return -1; | |
639 | } | |
640 | ||
641 | static inline int memcg_alloc_cache_params(struct mem_cgroup *memcg, | |
642 | struct kmem_cache *s, struct kmem_cache *root_cache) | |
643 | { | |
644 | return 0; | |
645 | } | |
646 | ||
647 | static inline void memcg_free_cache_params(struct kmem_cache *s) | |
648 | { | |
649 | } | |
650 | ||
651 | static inline void memcg_register_cache(struct kmem_cache *s) | |
652 | { | |
653 | } | |
654 | ||
655 | static inline void memcg_unregister_cache(struct kmem_cache *s) | |
656 | { | |
657 | } | |
658 | ||
659 | static inline struct kmem_cache * | |
660 | memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp) | |
661 | { | |
662 | return cachep; | |
663 | } | |
664 | #endif /* CONFIG_MEMCG_KMEM */ | |
665 | #endif /* _LINUX_MEMCONTROL_H */ | |
666 |