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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 |
2c26fdd7 KH |
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 | */ | |
78fb7466 | 67 | |
7a81b88c | 68 | extern int mem_cgroup_newpage_charge(struct page *page, struct mm_struct *mm, |
e1a1cd59 | 69 | gfp_t gfp_mask); |
7a81b88c | 70 | /* for swap handling */ |
8c7c6e34 | 71 | extern int mem_cgroup_try_charge_swapin(struct mm_struct *mm, |
72835c86 | 72 | struct page *page, gfp_t mask, struct mem_cgroup **memcgp); |
7a81b88c | 73 | extern void mem_cgroup_commit_charge_swapin(struct page *page, |
72835c86 JW |
74 | struct mem_cgroup *memcg); |
75 | extern void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *memcg); | |
7a81b88c | 76 | |
8289546e HD |
77 | extern int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm, |
78 | gfp_t gfp_mask); | |
925b7673 JW |
79 | |
80 | struct lruvec *mem_cgroup_zone_lruvec(struct zone *, struct mem_cgroup *); | |
fa9add64 | 81 | struct lruvec *mem_cgroup_page_lruvec(struct page *, struct zone *); |
569b846d KH |
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 | ||
3c541e14 | 87 | extern void mem_cgroup_uncharge_page(struct page *page); |
69029cd5 | 88 | extern void mem_cgroup_uncharge_cache_page(struct page *page); |
c9b0ed51 | 89 | |
c3ac9a8a JW |
90 | bool __mem_cgroup_same_or_subtree(const struct mem_cgroup *root_memcg, |
91 | struct mem_cgroup *memcg); | |
ffbdccf5 DR |
92 | bool task_in_mem_cgroup(struct task_struct *task, |
93 | const struct mem_cgroup *memcg); | |
3062fc67 | 94 | |
e42d9d5d | 95 | extern struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page); |
cf475ad2 | 96 | extern struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p); |
a433658c | 97 | extern struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm); |
cf475ad2 | 98 | |
e1aab161 | 99 | extern struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg); |
182446d0 | 100 | extern struct mem_cgroup *mem_cgroup_from_css(struct cgroup_subsys_state *css); |
e1aab161 | 101 | |
2e4d4091 | 102 | static inline |
587af308 | 103 | bool mm_match_cgroup(const struct mm_struct *mm, const struct mem_cgroup *memcg) |
2e4d4091 | 104 | { |
587af308 JW |
105 | struct mem_cgroup *task_memcg; |
106 | bool match; | |
c3ac9a8a | 107 | |
2e4d4091 | 108 | rcu_read_lock(); |
587af308 JW |
109 | task_memcg = mem_cgroup_from_task(rcu_dereference(mm->owner)); |
110 | match = __mem_cgroup_same_or_subtree(memcg, task_memcg); | |
2e4d4091 | 111 | rcu_read_unlock(); |
c3ac9a8a | 112 | return match; |
2e4d4091 | 113 | } |
8a9f3ccd | 114 | |
c0ff4b85 | 115 | extern struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *memcg); |
d324236b | 116 | |
0030f535 JW |
117 | extern void |
118 | mem_cgroup_prepare_migration(struct page *page, struct page *newpage, | |
119 | struct mem_cgroup **memcgp); | |
c0ff4b85 | 120 | extern void mem_cgroup_end_migration(struct mem_cgroup *memcg, |
50de1dd9 | 121 | struct page *oldpage, struct page *newpage, bool migration_ok); |
ae41be37 | 122 | |
694fbc0f AM |
123 | struct mem_cgroup *mem_cgroup_iter(struct mem_cgroup *, |
124 | struct mem_cgroup *, | |
125 | struct mem_cgroup_reclaim_cookie *); | |
5660048c JW |
126 | void mem_cgroup_iter_break(struct mem_cgroup *, struct mem_cgroup *); |
127 | ||
58ae83db KH |
128 | /* |
129 | * For memory reclaim. | |
130 | */ | |
c56d5c7d | 131 | int mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec); |
889976db | 132 | int mem_cgroup_select_victim_node(struct mem_cgroup *memcg); |
4d7dcca2 | 133 | unsigned long mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list); |
fa9add64 | 134 | void mem_cgroup_update_lru_size(struct lruvec *, enum lru_list, int); |
e222432b BS |
135 | extern void mem_cgroup_print_oom_info(struct mem_cgroup *memcg, |
136 | struct task_struct *p); | |
ab936cbc KH |
137 | extern void mem_cgroup_replace_page_cache(struct page *oldpage, |
138 | struct page *newpage); | |
58ae83db | 139 | |
49426420 | 140 | static inline void mem_cgroup_oom_enable(void) |
519e5247 | 141 | { |
49426420 JW |
142 | WARN_ON(current->memcg_oom.may_oom); |
143 | current->memcg_oom.may_oom = 1; | |
519e5247 JW |
144 | } |
145 | ||
49426420 | 146 | static inline void mem_cgroup_oom_disable(void) |
519e5247 | 147 | { |
49426420 JW |
148 | WARN_ON(!current->memcg_oom.may_oom); |
149 | current->memcg_oom.may_oom = 0; | |
519e5247 JW |
150 | } |
151 | ||
3812c8c8 JW |
152 | static inline bool task_in_memcg_oom(struct task_struct *p) |
153 | { | |
49426420 | 154 | return p->memcg_oom.memcg; |
3812c8c8 JW |
155 | } |
156 | ||
49426420 | 157 | bool mem_cgroup_oom_synchronize(bool wait); |
3812c8c8 | 158 | |
c255a458 | 159 | #ifdef CONFIG_MEMCG_SWAP |
c077719b KH |
160 | extern int do_swap_account; |
161 | #endif | |
f8d66542 HT |
162 | |
163 | static inline bool mem_cgroup_disabled(void) | |
164 | { | |
165 | if (mem_cgroup_subsys.disabled) | |
166 | return true; | |
167 | return false; | |
168 | } | |
169 | ||
89c06bd5 KH |
170 | void __mem_cgroup_begin_update_page_stat(struct page *page, bool *locked, |
171 | unsigned long *flags); | |
172 | ||
4331f7d3 KH |
173 | extern atomic_t memcg_moving; |
174 | ||
89c06bd5 KH |
175 | static inline void mem_cgroup_begin_update_page_stat(struct page *page, |
176 | bool *locked, unsigned long *flags) | |
177 | { | |
178 | if (mem_cgroup_disabled()) | |
179 | return; | |
180 | rcu_read_lock(); | |
181 | *locked = false; | |
4331f7d3 KH |
182 | if (atomic_read(&memcg_moving)) |
183 | __mem_cgroup_begin_update_page_stat(page, locked, flags); | |
89c06bd5 KH |
184 | } |
185 | ||
186 | void __mem_cgroup_end_update_page_stat(struct page *page, | |
187 | unsigned long *flags); | |
188 | static inline void mem_cgroup_end_update_page_stat(struct page *page, | |
189 | bool *locked, unsigned long *flags) | |
190 | { | |
191 | if (mem_cgroup_disabled()) | |
192 | return; | |
193 | if (*locked) | |
194 | __mem_cgroup_end_update_page_stat(page, flags); | |
195 | rcu_read_unlock(); | |
196 | } | |
197 | ||
2a7106f2 | 198 | void mem_cgroup_update_page_stat(struct page *page, |
68b4876d | 199 | enum mem_cgroup_stat_index idx, |
2a7106f2 GT |
200 | int val); |
201 | ||
202 | static inline void mem_cgroup_inc_page_stat(struct page *page, | |
68b4876d | 203 | enum mem_cgroup_stat_index idx) |
2a7106f2 GT |
204 | { |
205 | mem_cgroup_update_page_stat(page, idx, 1); | |
206 | } | |
207 | ||
208 | static inline void mem_cgroup_dec_page_stat(struct page *page, | |
68b4876d | 209 | enum mem_cgroup_stat_index idx) |
2a7106f2 GT |
210 | { |
211 | mem_cgroup_update_page_stat(page, idx, -1); | |
212 | } | |
213 | ||
0608f43d AM |
214 | unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order, |
215 | gfp_t gfp_mask, | |
216 | unsigned long *total_scanned); | |
a63d83f4 | 217 | |
68ae564b DR |
218 | void __mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx); |
219 | static inline void mem_cgroup_count_vm_event(struct mm_struct *mm, | |
220 | enum vm_event_item idx) | |
221 | { | |
222 | if (mem_cgroup_disabled()) | |
223 | return; | |
224 | __mem_cgroup_count_vm_event(mm, idx); | |
225 | } | |
ca3e0214 | 226 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
e94c8a9c | 227 | void mem_cgroup_split_huge_fixup(struct page *head); |
ca3e0214 KH |
228 | #endif |
229 | ||
f212ad7c DN |
230 | #ifdef CONFIG_DEBUG_VM |
231 | bool mem_cgroup_bad_page_check(struct page *page); | |
232 | void mem_cgroup_print_bad_page(struct page *page); | |
233 | #endif | |
c255a458 | 234 | #else /* CONFIG_MEMCG */ |
7a81b88c KH |
235 | struct mem_cgroup; |
236 | ||
237 | static inline int mem_cgroup_newpage_charge(struct page *page, | |
8289546e | 238 | struct mm_struct *mm, gfp_t gfp_mask) |
8a9f3ccd BS |
239 | { |
240 | return 0; | |
241 | } | |
242 | ||
8289546e HD |
243 | static inline int mem_cgroup_cache_charge(struct page *page, |
244 | struct mm_struct *mm, gfp_t gfp_mask) | |
8a9f3ccd | 245 | { |
8289546e | 246 | return 0; |
8a9f3ccd BS |
247 | } |
248 | ||
8c7c6e34 | 249 | static inline int mem_cgroup_try_charge_swapin(struct mm_struct *mm, |
72835c86 | 250 | struct page *page, gfp_t gfp_mask, struct mem_cgroup **memcgp) |
7a81b88c KH |
251 | { |
252 | return 0; | |
253 | } | |
254 | ||
255 | static inline void mem_cgroup_commit_charge_swapin(struct page *page, | |
72835c86 | 256 | struct mem_cgroup *memcg) |
7a81b88c KH |
257 | { |
258 | } | |
259 | ||
72835c86 | 260 | static inline void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *memcg) |
7a81b88c KH |
261 | { |
262 | } | |
263 | ||
569b846d KH |
264 | static inline void mem_cgroup_uncharge_start(void) |
265 | { | |
266 | } | |
267 | ||
268 | static inline void mem_cgroup_uncharge_end(void) | |
269 | { | |
270 | } | |
271 | ||
8a9f3ccd BS |
272 | static inline void mem_cgroup_uncharge_page(struct page *page) |
273 | { | |
274 | } | |
275 | ||
69029cd5 KH |
276 | static inline void mem_cgroup_uncharge_cache_page(struct page *page) |
277 | { | |
278 | } | |
279 | ||
925b7673 JW |
280 | static inline struct lruvec *mem_cgroup_zone_lruvec(struct zone *zone, |
281 | struct mem_cgroup *memcg) | |
08e552c6 | 282 | { |
925b7673 | 283 | return &zone->lruvec; |
08e552c6 KH |
284 | } |
285 | ||
fa9add64 HD |
286 | static inline struct lruvec *mem_cgroup_page_lruvec(struct page *page, |
287 | struct zone *zone) | |
66e1707b | 288 | { |
925b7673 | 289 | return &zone->lruvec; |
66e1707b BS |
290 | } |
291 | ||
e42d9d5d WF |
292 | static inline struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page) |
293 | { | |
294 | return NULL; | |
295 | } | |
296 | ||
a433658c KM |
297 | static inline struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm) |
298 | { | |
299 | return NULL; | |
300 | } | |
301 | ||
587af308 | 302 | static inline bool mm_match_cgroup(struct mm_struct *mm, |
c0ff4b85 | 303 | struct mem_cgroup *memcg) |
bed7161a | 304 | { |
587af308 | 305 | return true; |
bed7161a BS |
306 | } |
307 | ||
ffbdccf5 DR |
308 | static inline bool task_in_mem_cgroup(struct task_struct *task, |
309 | const struct mem_cgroup *memcg) | |
4c4a2214 | 310 | { |
ffbdccf5 | 311 | return true; |
4c4a2214 DR |
312 | } |
313 | ||
c0ff4b85 R |
314 | static inline struct cgroup_subsys_state |
315 | *mem_cgroup_css(struct mem_cgroup *memcg) | |
d324236b WF |
316 | { |
317 | return NULL; | |
318 | } | |
319 | ||
0030f535 | 320 | static inline void |
ac39cf8c | 321 | mem_cgroup_prepare_migration(struct page *page, struct page *newpage, |
0030f535 | 322 | struct mem_cgroup **memcgp) |
ae41be37 | 323 | { |
ae41be37 KH |
324 | } |
325 | ||
c0ff4b85 | 326 | static inline void mem_cgroup_end_migration(struct mem_cgroup *memcg, |
50de1dd9 | 327 | struct page *oldpage, struct page *newpage, bool migration_ok) |
ae41be37 KH |
328 | { |
329 | } | |
330 | ||
5660048c JW |
331 | static inline struct mem_cgroup * |
332 | mem_cgroup_iter(struct mem_cgroup *root, | |
333 | struct mem_cgroup *prev, | |
334 | struct mem_cgroup_reclaim_cookie *reclaim) | |
335 | { | |
336 | return NULL; | |
337 | } | |
338 | ||
339 | static inline void mem_cgroup_iter_break(struct mem_cgroup *root, | |
340 | struct mem_cgroup *prev) | |
341 | { | |
342 | } | |
343 | ||
f8d66542 HT |
344 | static inline bool mem_cgroup_disabled(void) |
345 | { | |
346 | return true; | |
347 | } | |
a636b327 | 348 | |
14797e23 | 349 | static inline int |
c56d5c7d | 350 | mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec) |
14797e23 KM |
351 | { |
352 | return 1; | |
353 | } | |
354 | ||
a3d8e054 | 355 | static inline unsigned long |
4d7dcca2 | 356 | mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list lru) |
a3d8e054 KM |
357 | { |
358 | return 0; | |
359 | } | |
360 | ||
fa9add64 HD |
361 | static inline void |
362 | mem_cgroup_update_lru_size(struct lruvec *lruvec, enum lru_list lru, | |
363 | int increment) | |
3e2f41f1 | 364 | { |
3e2f41f1 KM |
365 | } |
366 | ||
e222432b BS |
367 | static inline void |
368 | mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p) | |
369 | { | |
370 | } | |
371 | ||
89c06bd5 KH |
372 | static inline void mem_cgroup_begin_update_page_stat(struct page *page, |
373 | bool *locked, unsigned long *flags) | |
374 | { | |
375 | } | |
376 | ||
377 | static inline void mem_cgroup_end_update_page_stat(struct page *page, | |
378 | bool *locked, unsigned long *flags) | |
379 | { | |
380 | } | |
381 | ||
49426420 | 382 | static inline void mem_cgroup_oom_enable(void) |
519e5247 JW |
383 | { |
384 | } | |
385 | ||
49426420 | 386 | static inline void mem_cgroup_oom_disable(void) |
519e5247 JW |
387 | { |
388 | } | |
389 | ||
3812c8c8 JW |
390 | static inline bool task_in_memcg_oom(struct task_struct *p) |
391 | { | |
392 | return false; | |
393 | } | |
394 | ||
49426420 | 395 | static inline bool mem_cgroup_oom_synchronize(bool wait) |
3812c8c8 JW |
396 | { |
397 | return false; | |
398 | } | |
399 | ||
2a7106f2 | 400 | static inline void mem_cgroup_inc_page_stat(struct page *page, |
68b4876d | 401 | enum mem_cgroup_stat_index idx) |
2a7106f2 GT |
402 | { |
403 | } | |
404 | ||
405 | static inline void mem_cgroup_dec_page_stat(struct page *page, | |
68b4876d | 406 | enum mem_cgroup_stat_index idx) |
d69b042f BS |
407 | { |
408 | } | |
409 | ||
4e416953 | 410 | static inline |
0608f43d AM |
411 | unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order, |
412 | gfp_t gfp_mask, | |
413 | unsigned long *total_scanned) | |
4e416953 | 414 | { |
0608f43d | 415 | return 0; |
4e416953 BS |
416 | } |
417 | ||
e94c8a9c | 418 | static inline void mem_cgroup_split_huge_fixup(struct page *head) |
ca3e0214 KH |
419 | { |
420 | } | |
421 | ||
456f998e YH |
422 | static inline |
423 | void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx) | |
424 | { | |
425 | } | |
ab936cbc KH |
426 | static inline void mem_cgroup_replace_page_cache(struct page *oldpage, |
427 | struct page *newpage) | |
428 | { | |
429 | } | |
c255a458 | 430 | #endif /* CONFIG_MEMCG */ |
78fb7466 | 431 | |
c255a458 | 432 | #if !defined(CONFIG_MEMCG) || !defined(CONFIG_DEBUG_VM) |
f212ad7c DN |
433 | static inline bool |
434 | mem_cgroup_bad_page_check(struct page *page) | |
435 | { | |
436 | return false; | |
437 | } | |
438 | ||
439 | static inline void | |
440 | mem_cgroup_print_bad_page(struct page *page) | |
441 | { | |
442 | } | |
443 | #endif | |
444 | ||
e1aab161 GC |
445 | enum { |
446 | UNDER_LIMIT, | |
447 | SOFT_LIMIT, | |
448 | OVER_LIMIT, | |
449 | }; | |
450 | ||
451 | struct sock; | |
cd59085a | 452 | #if defined(CONFIG_INET) && defined(CONFIG_MEMCG_KMEM) |
e1aab161 GC |
453 | void sock_update_memcg(struct sock *sk); |
454 | void sock_release_memcg(struct sock *sk); | |
455 | #else | |
456 | static inline void sock_update_memcg(struct sock *sk) | |
457 | { | |
458 | } | |
459 | static inline void sock_release_memcg(struct sock *sk) | |
460 | { | |
461 | } | |
cd59085a | 462 | #endif /* CONFIG_INET && CONFIG_MEMCG_KMEM */ |
7ae1e1d0 GC |
463 | |
464 | #ifdef CONFIG_MEMCG_KMEM | |
a8964b9b | 465 | extern struct static_key memcg_kmem_enabled_key; |
749c5415 GC |
466 | |
467 | extern int memcg_limited_groups_array_size; | |
ebe945c2 GC |
468 | |
469 | /* | |
470 | * Helper macro to loop through all memcg-specific caches. Callers must still | |
471 | * check if the cache is valid (it is either valid or NULL). | |
472 | * the slab_mutex must be held when looping through those caches | |
473 | */ | |
749c5415 | 474 | #define for_each_memcg_cache_index(_idx) \ |
91c777d8 | 475 | for ((_idx) = 0; (_idx) < memcg_limited_groups_array_size; (_idx)++) |
749c5415 | 476 | |
7ae1e1d0 GC |
477 | static inline bool memcg_kmem_enabled(void) |
478 | { | |
a8964b9b | 479 | return static_key_false(&memcg_kmem_enabled_key); |
7ae1e1d0 GC |
480 | } |
481 | ||
482 | /* | |
483 | * In general, we'll do everything in our power to not incur in any overhead | |
484 | * for non-memcg users for the kmem functions. Not even a function call, if we | |
485 | * can avoid it. | |
486 | * | |
487 | * Therefore, we'll inline all those functions so that in the best case, we'll | |
488 | * see that kmemcg is off for everybody and proceed quickly. If it is on, | |
489 | * we'll still do most of the flag checking inline. We check a lot of | |
490 | * conditions, but because they are pretty simple, they are expected to be | |
491 | * fast. | |
492 | */ | |
493 | bool __memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg, | |
494 | int order); | |
495 | void __memcg_kmem_commit_charge(struct page *page, | |
496 | struct mem_cgroup *memcg, int order); | |
497 | void __memcg_kmem_uncharge_pages(struct page *page, int order); | |
498 | ||
2633d7a0 | 499 | int memcg_cache_id(struct mem_cgroup *memcg); |
363a044f VD |
500 | int memcg_alloc_cache_params(struct mem_cgroup *memcg, struct kmem_cache *s, |
501 | struct kmem_cache *root_cache); | |
502 | void memcg_free_cache_params(struct kmem_cache *s); | |
2633d7a0 GC |
503 | void memcg_release_cache(struct kmem_cache *cachep); |
504 | void memcg_cache_list_add(struct mem_cgroup *memcg, struct kmem_cache *cachep); | |
505 | ||
55007d84 GC |
506 | int memcg_update_cache_size(struct kmem_cache *s, int num_groups); |
507 | void memcg_update_array_size(int num_groups); | |
d7f25f8a GC |
508 | |
509 | struct kmem_cache * | |
510 | __memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp); | |
511 | ||
1f458cbf | 512 | void mem_cgroup_destroy_cache(struct kmem_cache *cachep); |
7cf27982 | 513 | void kmem_cache_destroy_memcg_children(struct kmem_cache *s); |
1f458cbf | 514 | |
7ae1e1d0 GC |
515 | /** |
516 | * memcg_kmem_newpage_charge: verify if a new kmem allocation is allowed. | |
517 | * @gfp: the gfp allocation flags. | |
518 | * @memcg: a pointer to the memcg this was charged against. | |
519 | * @order: allocation order. | |
520 | * | |
521 | * returns true if the memcg where the current task belongs can hold this | |
522 | * allocation. | |
523 | * | |
524 | * We return true automatically if this allocation is not to be accounted to | |
525 | * any memcg. | |
526 | */ | |
527 | static inline bool | |
528 | memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg, int order) | |
529 | { | |
530 | if (!memcg_kmem_enabled()) | |
531 | return true; | |
532 | ||
533 | /* | |
534 | * __GFP_NOFAIL allocations will move on even if charging is not | |
535 | * possible. Therefore we don't even try, and have this allocation | |
536 | * unaccounted. We could in theory charge it with | |
537 | * res_counter_charge_nofail, but we hope those allocations are rare, | |
538 | * and won't be worth the trouble. | |
539 | */ | |
540 | if (!(gfp & __GFP_KMEMCG) || (gfp & __GFP_NOFAIL)) | |
541 | return true; | |
542 | if (in_interrupt() || (!current->mm) || (current->flags & PF_KTHREAD)) | |
543 | return true; | |
544 | ||
545 | /* If the test is dying, just let it go. */ | |
546 | if (unlikely(fatal_signal_pending(current))) | |
547 | return true; | |
548 | ||
549 | return __memcg_kmem_newpage_charge(gfp, memcg, order); | |
550 | } | |
551 | ||
552 | /** | |
553 | * memcg_kmem_uncharge_pages: uncharge pages from memcg | |
554 | * @page: pointer to struct page being freed | |
555 | * @order: allocation order. | |
556 | * | |
557 | * there is no need to specify memcg here, since it is embedded in page_cgroup | |
558 | */ | |
559 | static inline void | |
560 | memcg_kmem_uncharge_pages(struct page *page, int order) | |
561 | { | |
562 | if (memcg_kmem_enabled()) | |
563 | __memcg_kmem_uncharge_pages(page, order); | |
564 | } | |
565 | ||
566 | /** | |
567 | * memcg_kmem_commit_charge: embeds correct memcg in a page | |
568 | * @page: pointer to struct page recently allocated | |
569 | * @memcg: the memcg structure we charged against | |
570 | * @order: allocation order. | |
571 | * | |
572 | * Needs to be called after memcg_kmem_newpage_charge, regardless of success or | |
573 | * failure of the allocation. if @page is NULL, this function will revert the | |
574 | * charges. Otherwise, it will commit the memcg given by @memcg to the | |
575 | * corresponding page_cgroup. | |
576 | */ | |
577 | static inline void | |
578 | memcg_kmem_commit_charge(struct page *page, struct mem_cgroup *memcg, int order) | |
579 | { | |
580 | if (memcg_kmem_enabled() && memcg) | |
581 | __memcg_kmem_commit_charge(page, memcg, order); | |
582 | } | |
583 | ||
d7f25f8a GC |
584 | /** |
585 | * memcg_kmem_get_cache: selects the correct per-memcg cache for allocation | |
586 | * @cachep: the original global kmem cache | |
587 | * @gfp: allocation flags. | |
588 | * | |
589 | * This function assumes that the task allocating, which determines the memcg | |
590 | * in the page allocator, belongs to the same cgroup throughout the whole | |
591 | * process. Misacounting can happen if the task calls memcg_kmem_get_cache() | |
592 | * while belonging to a cgroup, and later on changes. This is considered | |
593 | * acceptable, and should only happen upon task migration. | |
594 | * | |
595 | * Before the cache is created by the memcg core, there is also a possible | |
596 | * imbalance: the task belongs to a memcg, but the cache being allocated from | |
597 | * is the global cache, since the child cache is not yet guaranteed to be | |
598 | * ready. This case is also fine, since in this case the GFP_KMEMCG will not be | |
599 | * passed and the page allocator will not attempt any cgroup accounting. | |
600 | */ | |
601 | static __always_inline struct kmem_cache * | |
602 | memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp) | |
603 | { | |
604 | if (!memcg_kmem_enabled()) | |
605 | return cachep; | |
606 | if (gfp & __GFP_NOFAIL) | |
607 | return cachep; | |
608 | if (in_interrupt() || (!current->mm) || (current->flags & PF_KTHREAD)) | |
609 | return cachep; | |
610 | if (unlikely(fatal_signal_pending(current))) | |
611 | return cachep; | |
612 | ||
613 | return __memcg_kmem_get_cache(cachep, gfp); | |
614 | } | |
7ae1e1d0 | 615 | #else |
749c5415 GC |
616 | #define for_each_memcg_cache_index(_idx) \ |
617 | for (; NULL; ) | |
618 | ||
b9ce5ef4 GC |
619 | static inline bool memcg_kmem_enabled(void) |
620 | { | |
621 | return false; | |
622 | } | |
623 | ||
7ae1e1d0 GC |
624 | static inline bool |
625 | memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg, int order) | |
626 | { | |
627 | return true; | |
628 | } | |
629 | ||
630 | static inline void memcg_kmem_uncharge_pages(struct page *page, int order) | |
631 | { | |
632 | } | |
633 | ||
634 | static inline void | |
635 | memcg_kmem_commit_charge(struct page *page, struct mem_cgroup *memcg, int order) | |
636 | { | |
637 | } | |
2633d7a0 GC |
638 | |
639 | static inline int memcg_cache_id(struct mem_cgroup *memcg) | |
640 | { | |
641 | return -1; | |
642 | } | |
643 | ||
363a044f VD |
644 | static inline int memcg_alloc_cache_params(struct mem_cgroup *memcg, |
645 | struct kmem_cache *s, struct kmem_cache *root_cache) | |
2633d7a0 GC |
646 | { |
647 | return 0; | |
648 | } | |
649 | ||
363a044f VD |
650 | static inline void memcg_free_cache_params(struct kmem_cache *s) |
651 | { | |
652 | } | |
653 | ||
2633d7a0 GC |
654 | static inline void memcg_release_cache(struct kmem_cache *cachep) |
655 | { | |
656 | } | |
657 | ||
658 | static inline void memcg_cache_list_add(struct mem_cgroup *memcg, | |
659 | struct kmem_cache *s) | |
660 | { | |
661 | } | |
d7f25f8a GC |
662 | |
663 | static inline struct kmem_cache * | |
664 | memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp) | |
665 | { | |
666 | return cachep; | |
667 | } | |
7cf27982 GC |
668 | |
669 | static inline void kmem_cache_destroy_memcg_children(struct kmem_cache *s) | |
670 | { | |
671 | } | |
7ae1e1d0 | 672 | #endif /* CONFIG_MEMCG_KMEM */ |
8cdea7c0 BS |
673 | #endif /* _LINUX_MEMCONTROL_H */ |
674 |