Commit | Line | Data |
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8cdea7c0 BS |
1 | /* memcontrol.h - 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 | #ifndef _LINUX_MEMCONTROL_H | |
21 | #define _LINUX_MEMCONTROL_H | |
f8d66542 | 22 | #include <linux/cgroup.h> |
456f998e | 23 | #include <linux/vm_event_item.h> |
7ae1e1d0 | 24 | #include <linux/hardirq.h> |
a8964b9b | 25 | #include <linux/jump_label.h> |
456f998e | 26 | |
78fb7466 PE |
27 | struct mem_cgroup; |
28 | struct page_cgroup; | |
8697d331 BS |
29 | struct page; |
30 | struct mm_struct; | |
2633d7a0 | 31 | struct kmem_cache; |
78fb7466 | 32 | |
68b4876d SZ |
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 */ | |
3ea67d06 | 45 | MEM_CGROUP_STAT_WRITEBACK, /* # of pages under writeback */ |
68b4876d SZ |
46 | MEM_CGROUP_STAT_SWAP, /* # of pages, swapped out */ |
47 | MEM_CGROUP_STAT_NSTATS, | |
2a7106f2 GT |
48 | }; |
49 | ||
5660048c JW |
50 | struct mem_cgroup_reclaim_cookie { |
51 | struct zone *zone; | |
52 | int priority; | |
53 | unsigned int generation; | |
54 | }; | |
55 | ||
c255a458 | 56 | #ifdef CONFIG_MEMCG |
00501b53 JW |
57 | int mem_cgroup_try_charge(struct page *page, struct mm_struct *mm, |
58 | gfp_t gfp_mask, struct mem_cgroup **memcgp); | |
59 | void mem_cgroup_commit_charge(struct page *page, struct mem_cgroup *memcg, | |
60 | bool lrucare); | |
61 | void mem_cgroup_cancel_charge(struct page *page, struct mem_cgroup *memcg); | |
925b7673 | 62 | |
0a31bc97 JW |
63 | void mem_cgroup_uncharge(struct page *page); |
64 | ||
65 | /* Batched uncharging */ | |
66 | void mem_cgroup_uncharge_start(void); | |
67 | void mem_cgroup_uncharge_end(void); | |
569b846d | 68 | |
0a31bc97 JW |
69 | void mem_cgroup_migrate(struct page *oldpage, struct page *newpage, |
70 | bool lrucare); | |
569b846d | 71 | |
0a31bc97 JW |
72 | struct lruvec *mem_cgroup_zone_lruvec(struct zone *, struct mem_cgroup *); |
73 | struct lruvec *mem_cgroup_page_lruvec(struct page *, struct zone *); | |
c9b0ed51 | 74 | |
c3ac9a8a JW |
75 | bool __mem_cgroup_same_or_subtree(const struct mem_cgroup *root_memcg, |
76 | struct mem_cgroup *memcg); | |
ffbdccf5 DR |
77 | bool task_in_mem_cgroup(struct task_struct *task, |
78 | const struct mem_cgroup *memcg); | |
3062fc67 | 79 | |
e42d9d5d | 80 | extern struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page); |
cf475ad2 BS |
81 | extern struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p); |
82 | ||
e1aab161 | 83 | extern struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg); |
182446d0 | 84 | extern struct mem_cgroup *mem_cgroup_from_css(struct cgroup_subsys_state *css); |
e1aab161 | 85 | |
2e4d4091 | 86 | static inline |
587af308 | 87 | bool mm_match_cgroup(const struct mm_struct *mm, const struct mem_cgroup *memcg) |
2e4d4091 | 88 | { |
587af308 JW |
89 | struct mem_cgroup *task_memcg; |
90 | bool match; | |
c3ac9a8a | 91 | |
2e4d4091 | 92 | rcu_read_lock(); |
587af308 JW |
93 | task_memcg = mem_cgroup_from_task(rcu_dereference(mm->owner)); |
94 | match = __mem_cgroup_same_or_subtree(memcg, task_memcg); | |
2e4d4091 | 95 | rcu_read_unlock(); |
c3ac9a8a | 96 | return match; |
2e4d4091 | 97 | } |
8a9f3ccd | 98 | |
c0ff4b85 | 99 | extern struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *memcg); |
d324236b | 100 | |
694fbc0f AM |
101 | struct mem_cgroup *mem_cgroup_iter(struct mem_cgroup *, |
102 | struct mem_cgroup *, | |
103 | struct mem_cgroup_reclaim_cookie *); | |
5660048c JW |
104 | void mem_cgroup_iter_break(struct mem_cgroup *, struct mem_cgroup *); |
105 | ||
58ae83db KH |
106 | /* |
107 | * For memory reclaim. | |
108 | */ | |
c56d5c7d | 109 | int mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec); |
889976db | 110 | int mem_cgroup_select_victim_node(struct mem_cgroup *memcg); |
4d7dcca2 | 111 | unsigned long mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list); |
fa9add64 | 112 | void mem_cgroup_update_lru_size(struct lruvec *, enum lru_list, int); |
e222432b BS |
113 | extern void mem_cgroup_print_oom_info(struct mem_cgroup *memcg, |
114 | struct task_struct *p); | |
58ae83db | 115 | |
49426420 | 116 | static inline void mem_cgroup_oom_enable(void) |
519e5247 | 117 | { |
49426420 JW |
118 | WARN_ON(current->memcg_oom.may_oom); |
119 | current->memcg_oom.may_oom = 1; | |
519e5247 JW |
120 | } |
121 | ||
49426420 | 122 | static inline void mem_cgroup_oom_disable(void) |
519e5247 | 123 | { |
49426420 JW |
124 | WARN_ON(!current->memcg_oom.may_oom); |
125 | current->memcg_oom.may_oom = 0; | |
519e5247 JW |
126 | } |
127 | ||
3812c8c8 JW |
128 | static inline bool task_in_memcg_oom(struct task_struct *p) |
129 | { | |
49426420 | 130 | return p->memcg_oom.memcg; |
3812c8c8 JW |
131 | } |
132 | ||
49426420 | 133 | bool mem_cgroup_oom_synchronize(bool wait); |
3812c8c8 | 134 | |
c255a458 | 135 | #ifdef CONFIG_MEMCG_SWAP |
c077719b KH |
136 | extern int do_swap_account; |
137 | #endif | |
f8d66542 HT |
138 | |
139 | static inline bool mem_cgroup_disabled(void) | |
140 | { | |
073219e9 | 141 | if (memory_cgrp_subsys.disabled) |
f8d66542 HT |
142 | return true; |
143 | return false; | |
144 | } | |
145 | ||
89c06bd5 KH |
146 | void __mem_cgroup_begin_update_page_stat(struct page *page, bool *locked, |
147 | unsigned long *flags); | |
148 | ||
4331f7d3 KH |
149 | extern atomic_t memcg_moving; |
150 | ||
89c06bd5 KH |
151 | static inline void mem_cgroup_begin_update_page_stat(struct page *page, |
152 | bool *locked, unsigned long *flags) | |
153 | { | |
154 | if (mem_cgroup_disabled()) | |
155 | return; | |
156 | rcu_read_lock(); | |
157 | *locked = false; | |
4331f7d3 KH |
158 | if (atomic_read(&memcg_moving)) |
159 | __mem_cgroup_begin_update_page_stat(page, locked, flags); | |
89c06bd5 KH |
160 | } |
161 | ||
162 | void __mem_cgroup_end_update_page_stat(struct page *page, | |
163 | unsigned long *flags); | |
164 | static inline void mem_cgroup_end_update_page_stat(struct page *page, | |
165 | bool *locked, unsigned long *flags) | |
166 | { | |
167 | if (mem_cgroup_disabled()) | |
168 | return; | |
169 | if (*locked) | |
170 | __mem_cgroup_end_update_page_stat(page, flags); | |
171 | rcu_read_unlock(); | |
172 | } | |
173 | ||
2a7106f2 | 174 | void mem_cgroup_update_page_stat(struct page *page, |
68b4876d | 175 | enum mem_cgroup_stat_index idx, |
2a7106f2 GT |
176 | int val); |
177 | ||
178 | static inline void mem_cgroup_inc_page_stat(struct page *page, | |
68b4876d | 179 | enum mem_cgroup_stat_index idx) |
2a7106f2 GT |
180 | { |
181 | mem_cgroup_update_page_stat(page, idx, 1); | |
182 | } | |
183 | ||
184 | static inline void mem_cgroup_dec_page_stat(struct page *page, | |
68b4876d | 185 | enum mem_cgroup_stat_index idx) |
2a7106f2 GT |
186 | { |
187 | mem_cgroup_update_page_stat(page, idx, -1); | |
188 | } | |
189 | ||
0608f43d AM |
190 | unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order, |
191 | gfp_t gfp_mask, | |
192 | unsigned long *total_scanned); | |
a63d83f4 | 193 | |
68ae564b DR |
194 | void __mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx); |
195 | static inline void mem_cgroup_count_vm_event(struct mm_struct *mm, | |
196 | enum vm_event_item idx) | |
197 | { | |
198 | if (mem_cgroup_disabled()) | |
199 | return; | |
200 | __mem_cgroup_count_vm_event(mm, idx); | |
201 | } | |
ca3e0214 | 202 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
e94c8a9c | 203 | void mem_cgroup_split_huge_fixup(struct page *head); |
ca3e0214 KH |
204 | #endif |
205 | ||
f212ad7c DN |
206 | #ifdef CONFIG_DEBUG_VM |
207 | bool mem_cgroup_bad_page_check(struct page *page); | |
208 | void mem_cgroup_print_bad_page(struct page *page); | |
209 | #endif | |
c255a458 | 210 | #else /* CONFIG_MEMCG */ |
7a81b88c KH |
211 | struct mem_cgroup; |
212 | ||
00501b53 JW |
213 | static inline int mem_cgroup_try_charge(struct page *page, struct mm_struct *mm, |
214 | gfp_t gfp_mask, | |
215 | struct mem_cgroup **memcgp) | |
7a81b88c | 216 | { |
00501b53 | 217 | *memcgp = NULL; |
7a81b88c KH |
218 | return 0; |
219 | } | |
220 | ||
00501b53 JW |
221 | static inline void mem_cgroup_commit_charge(struct page *page, |
222 | struct mem_cgroup *memcg, | |
223 | bool lrucare) | |
7a81b88c KH |
224 | { |
225 | } | |
226 | ||
00501b53 JW |
227 | static inline void mem_cgroup_cancel_charge(struct page *page, |
228 | struct mem_cgroup *memcg) | |
7a81b88c KH |
229 | { |
230 | } | |
231 | ||
0a31bc97 | 232 | static inline void mem_cgroup_uncharge(struct page *page) |
569b846d KH |
233 | { |
234 | } | |
235 | ||
0a31bc97 | 236 | static inline void mem_cgroup_uncharge_start(void) |
569b846d KH |
237 | { |
238 | } | |
239 | ||
0a31bc97 | 240 | static inline void mem_cgroup_uncharge_end(void) |
8a9f3ccd BS |
241 | { |
242 | } | |
243 | ||
0a31bc97 JW |
244 | static inline void mem_cgroup_migrate(struct page *oldpage, |
245 | struct page *newpage, | |
246 | bool lrucare) | |
69029cd5 KH |
247 | { |
248 | } | |
249 | ||
925b7673 JW |
250 | static inline struct lruvec *mem_cgroup_zone_lruvec(struct zone *zone, |
251 | struct mem_cgroup *memcg) | |
08e552c6 | 252 | { |
925b7673 | 253 | return &zone->lruvec; |
08e552c6 KH |
254 | } |
255 | ||
fa9add64 HD |
256 | static inline struct lruvec *mem_cgroup_page_lruvec(struct page *page, |
257 | struct zone *zone) | |
66e1707b | 258 | { |
925b7673 | 259 | return &zone->lruvec; |
66e1707b BS |
260 | } |
261 | ||
e42d9d5d WF |
262 | static inline struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page) |
263 | { | |
264 | return NULL; | |
265 | } | |
266 | ||
587af308 | 267 | static inline bool mm_match_cgroup(struct mm_struct *mm, |
c0ff4b85 | 268 | struct mem_cgroup *memcg) |
bed7161a | 269 | { |
587af308 | 270 | return true; |
bed7161a BS |
271 | } |
272 | ||
ffbdccf5 DR |
273 | static inline bool task_in_mem_cgroup(struct task_struct *task, |
274 | const struct mem_cgroup *memcg) | |
4c4a2214 | 275 | { |
ffbdccf5 | 276 | return true; |
4c4a2214 DR |
277 | } |
278 | ||
c0ff4b85 R |
279 | static inline struct cgroup_subsys_state |
280 | *mem_cgroup_css(struct mem_cgroup *memcg) | |
d324236b WF |
281 | { |
282 | return NULL; | |
283 | } | |
284 | ||
5660048c JW |
285 | static inline struct mem_cgroup * |
286 | mem_cgroup_iter(struct mem_cgroup *root, | |
287 | struct mem_cgroup *prev, | |
288 | struct mem_cgroup_reclaim_cookie *reclaim) | |
289 | { | |
290 | return NULL; | |
291 | } | |
292 | ||
293 | static inline void mem_cgroup_iter_break(struct mem_cgroup *root, | |
294 | struct mem_cgroup *prev) | |
295 | { | |
296 | } | |
297 | ||
f8d66542 HT |
298 | static inline bool mem_cgroup_disabled(void) |
299 | { | |
300 | return true; | |
301 | } | |
a636b327 | 302 | |
14797e23 | 303 | static inline int |
c56d5c7d | 304 | mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec) |
14797e23 KM |
305 | { |
306 | return 1; | |
307 | } | |
308 | ||
a3d8e054 | 309 | static inline unsigned long |
4d7dcca2 | 310 | mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list lru) |
a3d8e054 KM |
311 | { |
312 | return 0; | |
313 | } | |
314 | ||
fa9add64 HD |
315 | static inline void |
316 | mem_cgroup_update_lru_size(struct lruvec *lruvec, enum lru_list lru, | |
317 | int increment) | |
3e2f41f1 | 318 | { |
3e2f41f1 KM |
319 | } |
320 | ||
e222432b BS |
321 | static inline void |
322 | mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p) | |
323 | { | |
324 | } | |
325 | ||
89c06bd5 KH |
326 | static inline void mem_cgroup_begin_update_page_stat(struct page *page, |
327 | bool *locked, unsigned long *flags) | |
328 | { | |
329 | } | |
330 | ||
331 | static inline void mem_cgroup_end_update_page_stat(struct page *page, | |
332 | bool *locked, unsigned long *flags) | |
333 | { | |
334 | } | |
335 | ||
49426420 | 336 | static inline void mem_cgroup_oom_enable(void) |
519e5247 JW |
337 | { |
338 | } | |
339 | ||
49426420 | 340 | static inline void mem_cgroup_oom_disable(void) |
519e5247 JW |
341 | { |
342 | } | |
343 | ||
3812c8c8 JW |
344 | static inline bool task_in_memcg_oom(struct task_struct *p) |
345 | { | |
346 | return false; | |
347 | } | |
348 | ||
49426420 | 349 | static inline bool mem_cgroup_oom_synchronize(bool wait) |
3812c8c8 JW |
350 | { |
351 | return false; | |
352 | } | |
353 | ||
2a7106f2 | 354 | static inline void mem_cgroup_inc_page_stat(struct page *page, |
68b4876d | 355 | enum mem_cgroup_stat_index idx) |
2a7106f2 GT |
356 | { |
357 | } | |
358 | ||
359 | static inline void mem_cgroup_dec_page_stat(struct page *page, | |
68b4876d | 360 | enum mem_cgroup_stat_index idx) |
d69b042f BS |
361 | { |
362 | } | |
363 | ||
4e416953 | 364 | static inline |
0608f43d AM |
365 | unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order, |
366 | gfp_t gfp_mask, | |
367 | unsigned long *total_scanned) | |
4e416953 | 368 | { |
0608f43d | 369 | return 0; |
4e416953 BS |
370 | } |
371 | ||
e94c8a9c | 372 | static inline void mem_cgroup_split_huge_fixup(struct page *head) |
ca3e0214 KH |
373 | { |
374 | } | |
375 | ||
456f998e YH |
376 | static inline |
377 | void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx) | |
378 | { | |
379 | } | |
c255a458 | 380 | #endif /* CONFIG_MEMCG */ |
78fb7466 | 381 | |
c255a458 | 382 | #if !defined(CONFIG_MEMCG) || !defined(CONFIG_DEBUG_VM) |
f212ad7c DN |
383 | static inline bool |
384 | mem_cgroup_bad_page_check(struct page *page) | |
385 | { | |
386 | return false; | |
387 | } | |
388 | ||
389 | static inline void | |
390 | mem_cgroup_print_bad_page(struct page *page) | |
391 | { | |
392 | } | |
393 | #endif | |
394 | ||
e1aab161 GC |
395 | enum { |
396 | UNDER_LIMIT, | |
397 | SOFT_LIMIT, | |
398 | OVER_LIMIT, | |
399 | }; | |
400 | ||
401 | struct sock; | |
cd59085a | 402 | #if defined(CONFIG_INET) && defined(CONFIG_MEMCG_KMEM) |
e1aab161 GC |
403 | void sock_update_memcg(struct sock *sk); |
404 | void sock_release_memcg(struct sock *sk); | |
405 | #else | |
406 | static inline void sock_update_memcg(struct sock *sk) | |
407 | { | |
408 | } | |
409 | static inline void sock_release_memcg(struct sock *sk) | |
410 | { | |
411 | } | |
cd59085a | 412 | #endif /* CONFIG_INET && CONFIG_MEMCG_KMEM */ |
7ae1e1d0 GC |
413 | |
414 | #ifdef CONFIG_MEMCG_KMEM | |
a8964b9b | 415 | extern struct static_key memcg_kmem_enabled_key; |
749c5415 GC |
416 | |
417 | extern int memcg_limited_groups_array_size; | |
ebe945c2 GC |
418 | |
419 | /* | |
420 | * Helper macro to loop through all memcg-specific caches. Callers must still | |
421 | * check if the cache is valid (it is either valid or NULL). | |
422 | * the slab_mutex must be held when looping through those caches | |
423 | */ | |
749c5415 | 424 | #define for_each_memcg_cache_index(_idx) \ |
91c777d8 | 425 | for ((_idx) = 0; (_idx) < memcg_limited_groups_array_size; (_idx)++) |
749c5415 | 426 | |
7ae1e1d0 GC |
427 | static inline bool memcg_kmem_enabled(void) |
428 | { | |
a8964b9b | 429 | return static_key_false(&memcg_kmem_enabled_key); |
7ae1e1d0 GC |
430 | } |
431 | ||
432 | /* | |
433 | * In general, we'll do everything in our power to not incur in any overhead | |
434 | * for non-memcg users for the kmem functions. Not even a function call, if we | |
435 | * can avoid it. | |
436 | * | |
437 | * Therefore, we'll inline all those functions so that in the best case, we'll | |
438 | * see that kmemcg is off for everybody and proceed quickly. If it is on, | |
439 | * we'll still do most of the flag checking inline. We check a lot of | |
440 | * conditions, but because they are pretty simple, they are expected to be | |
441 | * fast. | |
442 | */ | |
443 | bool __memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg, | |
444 | int order); | |
445 | void __memcg_kmem_commit_charge(struct page *page, | |
446 | struct mem_cgroup *memcg, int order); | |
447 | void __memcg_kmem_uncharge_pages(struct page *page, int order); | |
448 | ||
2633d7a0 | 449 | int memcg_cache_id(struct mem_cgroup *memcg); |
5722d094 | 450 | |
363a044f VD |
451 | int memcg_alloc_cache_params(struct mem_cgroup *memcg, struct kmem_cache *s, |
452 | struct kmem_cache *root_cache); | |
453 | void memcg_free_cache_params(struct kmem_cache *s); | |
2633d7a0 | 454 | |
55007d84 GC |
455 | int memcg_update_cache_size(struct kmem_cache *s, int num_groups); |
456 | void memcg_update_array_size(int num_groups); | |
d7f25f8a GC |
457 | |
458 | struct kmem_cache * | |
459 | __memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp); | |
460 | ||
c67a8a68 VD |
461 | int __memcg_charge_slab(struct kmem_cache *cachep, gfp_t gfp, int order); |
462 | void __memcg_uncharge_slab(struct kmem_cache *cachep, int order); | |
5dfb4175 | 463 | |
776ed0f0 | 464 | int __memcg_cleanup_cache_params(struct kmem_cache *s); |
1f458cbf | 465 | |
7ae1e1d0 GC |
466 | /** |
467 | * memcg_kmem_newpage_charge: verify if a new kmem allocation is allowed. | |
468 | * @gfp: the gfp allocation flags. | |
469 | * @memcg: a pointer to the memcg this was charged against. | |
470 | * @order: allocation order. | |
471 | * | |
472 | * returns true if the memcg where the current task belongs can hold this | |
473 | * allocation. | |
474 | * | |
475 | * We return true automatically if this allocation is not to be accounted to | |
476 | * any memcg. | |
477 | */ | |
478 | static inline bool | |
479 | memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg, int order) | |
480 | { | |
481 | if (!memcg_kmem_enabled()) | |
482 | return true; | |
483 | ||
484 | /* | |
485 | * __GFP_NOFAIL allocations will move on even if charging is not | |
486 | * possible. Therefore we don't even try, and have this allocation | |
487 | * unaccounted. We could in theory charge it with | |
488 | * res_counter_charge_nofail, but we hope those allocations are rare, | |
489 | * and won't be worth the trouble. | |
490 | */ | |
52383431 | 491 | if (gfp & __GFP_NOFAIL) |
7ae1e1d0 GC |
492 | return true; |
493 | if (in_interrupt() || (!current->mm) || (current->flags & PF_KTHREAD)) | |
494 | return true; | |
495 | ||
496 | /* If the test is dying, just let it go. */ | |
497 | if (unlikely(fatal_signal_pending(current))) | |
498 | return true; | |
499 | ||
500 | return __memcg_kmem_newpage_charge(gfp, memcg, order); | |
501 | } | |
502 | ||
503 | /** | |
504 | * memcg_kmem_uncharge_pages: uncharge pages from memcg | |
505 | * @page: pointer to struct page being freed | |
506 | * @order: allocation order. | |
507 | * | |
508 | * there is no need to specify memcg here, since it is embedded in page_cgroup | |
509 | */ | |
510 | static inline void | |
511 | memcg_kmem_uncharge_pages(struct page *page, int order) | |
512 | { | |
513 | if (memcg_kmem_enabled()) | |
514 | __memcg_kmem_uncharge_pages(page, order); | |
515 | } | |
516 | ||
517 | /** | |
518 | * memcg_kmem_commit_charge: embeds correct memcg in a page | |
519 | * @page: pointer to struct page recently allocated | |
520 | * @memcg: the memcg structure we charged against | |
521 | * @order: allocation order. | |
522 | * | |
523 | * Needs to be called after memcg_kmem_newpage_charge, regardless of success or | |
524 | * failure of the allocation. if @page is NULL, this function will revert the | |
525 | * charges. Otherwise, it will commit the memcg given by @memcg to the | |
526 | * corresponding page_cgroup. | |
527 | */ | |
528 | static inline void | |
529 | memcg_kmem_commit_charge(struct page *page, struct mem_cgroup *memcg, int order) | |
530 | { | |
531 | if (memcg_kmem_enabled() && memcg) | |
532 | __memcg_kmem_commit_charge(page, memcg, order); | |
533 | } | |
534 | ||
d7f25f8a GC |
535 | /** |
536 | * memcg_kmem_get_cache: selects the correct per-memcg cache for allocation | |
537 | * @cachep: the original global kmem cache | |
538 | * @gfp: allocation flags. | |
539 | * | |
5dfb4175 | 540 | * All memory allocated from a per-memcg cache is charged to the owner memcg. |
d7f25f8a GC |
541 | */ |
542 | static __always_inline struct kmem_cache * | |
543 | memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp) | |
544 | { | |
545 | if (!memcg_kmem_enabled()) | |
546 | return cachep; | |
547 | if (gfp & __GFP_NOFAIL) | |
548 | return cachep; | |
549 | if (in_interrupt() || (!current->mm) || (current->flags & PF_KTHREAD)) | |
550 | return cachep; | |
551 | if (unlikely(fatal_signal_pending(current))) | |
552 | return cachep; | |
553 | ||
554 | return __memcg_kmem_get_cache(cachep, gfp); | |
555 | } | |
7ae1e1d0 | 556 | #else |
749c5415 GC |
557 | #define for_each_memcg_cache_index(_idx) \ |
558 | for (; NULL; ) | |
559 | ||
b9ce5ef4 GC |
560 | static inline bool memcg_kmem_enabled(void) |
561 | { | |
562 | return false; | |
563 | } | |
564 | ||
7ae1e1d0 GC |
565 | static inline bool |
566 | memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg, int order) | |
567 | { | |
568 | return true; | |
569 | } | |
570 | ||
571 | static inline void memcg_kmem_uncharge_pages(struct page *page, int order) | |
572 | { | |
573 | } | |
574 | ||
575 | static inline void | |
576 | memcg_kmem_commit_charge(struct page *page, struct mem_cgroup *memcg, int order) | |
577 | { | |
578 | } | |
2633d7a0 GC |
579 | |
580 | static inline int memcg_cache_id(struct mem_cgroup *memcg) | |
581 | { | |
582 | return -1; | |
583 | } | |
584 | ||
363a044f VD |
585 | static inline int memcg_alloc_cache_params(struct mem_cgroup *memcg, |
586 | struct kmem_cache *s, struct kmem_cache *root_cache) | |
2633d7a0 GC |
587 | { |
588 | return 0; | |
589 | } | |
590 | ||
363a044f VD |
591 | static inline void memcg_free_cache_params(struct kmem_cache *s) |
592 | { | |
593 | } | |
594 | ||
d7f25f8a GC |
595 | static inline struct kmem_cache * |
596 | memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp) | |
597 | { | |
598 | return cachep; | |
599 | } | |
7ae1e1d0 | 600 | #endif /* CONFIG_MEMCG_KMEM */ |
8cdea7c0 BS |
601 | #endif /* _LINUX_MEMCONTROL_H */ |
602 |