Commit | Line | Data |
---|---|---|
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 | |
519e5247 JW |
140 | /** |
141 | * mem_cgroup_toggle_oom - toggle the memcg OOM killer for the current task | |
142 | * @new: true to enable, false to disable | |
143 | * | |
144 | * Toggle whether a failed memcg charge should invoke the OOM killer | |
145 | * or just return -ENOMEM. Returns the previous toggle state. | |
3812c8c8 JW |
146 | * |
147 | * NOTE: Any path that enables the OOM killer before charging must | |
148 | * call mem_cgroup_oom_synchronize() afterward to finalize the | |
149 | * OOM handling and clean up. | |
519e5247 JW |
150 | */ |
151 | static inline bool mem_cgroup_toggle_oom(bool new) | |
152 | { | |
153 | bool old; | |
154 | ||
155 | old = current->memcg_oom.may_oom; | |
156 | current->memcg_oom.may_oom = new; | |
157 | ||
158 | return old; | |
159 | } | |
160 | ||
161 | static inline void mem_cgroup_enable_oom(void) | |
162 | { | |
163 | bool old = mem_cgroup_toggle_oom(true); | |
164 | ||
165 | WARN_ON(old == true); | |
166 | } | |
167 | ||
168 | static inline void mem_cgroup_disable_oom(void) | |
169 | { | |
170 | bool old = mem_cgroup_toggle_oom(false); | |
171 | ||
172 | WARN_ON(old == false); | |
173 | } | |
174 | ||
3812c8c8 JW |
175 | static inline bool task_in_memcg_oom(struct task_struct *p) |
176 | { | |
177 | return p->memcg_oom.in_memcg_oom; | |
178 | } | |
179 | ||
180 | bool mem_cgroup_oom_synchronize(void); | |
181 | ||
c255a458 | 182 | #ifdef CONFIG_MEMCG_SWAP |
c077719b KH |
183 | extern int do_swap_account; |
184 | #endif | |
f8d66542 HT |
185 | |
186 | static inline bool mem_cgroup_disabled(void) | |
187 | { | |
188 | if (mem_cgroup_subsys.disabled) | |
189 | return true; | |
190 | return false; | |
191 | } | |
192 | ||
89c06bd5 KH |
193 | void __mem_cgroup_begin_update_page_stat(struct page *page, bool *locked, |
194 | unsigned long *flags); | |
195 | ||
4331f7d3 KH |
196 | extern atomic_t memcg_moving; |
197 | ||
89c06bd5 KH |
198 | static inline void mem_cgroup_begin_update_page_stat(struct page *page, |
199 | bool *locked, unsigned long *flags) | |
200 | { | |
201 | if (mem_cgroup_disabled()) | |
202 | return; | |
203 | rcu_read_lock(); | |
204 | *locked = false; | |
4331f7d3 KH |
205 | if (atomic_read(&memcg_moving)) |
206 | __mem_cgroup_begin_update_page_stat(page, locked, flags); | |
89c06bd5 KH |
207 | } |
208 | ||
209 | void __mem_cgroup_end_update_page_stat(struct page *page, | |
210 | unsigned long *flags); | |
211 | static inline void mem_cgroup_end_update_page_stat(struct page *page, | |
212 | bool *locked, unsigned long *flags) | |
213 | { | |
214 | if (mem_cgroup_disabled()) | |
215 | return; | |
216 | if (*locked) | |
217 | __mem_cgroup_end_update_page_stat(page, flags); | |
218 | rcu_read_unlock(); | |
219 | } | |
220 | ||
2a7106f2 | 221 | void mem_cgroup_update_page_stat(struct page *page, |
68b4876d | 222 | enum mem_cgroup_stat_index idx, |
2a7106f2 GT |
223 | int val); |
224 | ||
225 | static inline void mem_cgroup_inc_page_stat(struct page *page, | |
68b4876d | 226 | enum mem_cgroup_stat_index idx) |
2a7106f2 GT |
227 | { |
228 | mem_cgroup_update_page_stat(page, idx, 1); | |
229 | } | |
230 | ||
231 | static inline void mem_cgroup_dec_page_stat(struct page *page, | |
68b4876d | 232 | enum mem_cgroup_stat_index idx) |
2a7106f2 GT |
233 | { |
234 | mem_cgroup_update_page_stat(page, idx, -1); | |
235 | } | |
236 | ||
0608f43d AM |
237 | unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order, |
238 | gfp_t gfp_mask, | |
239 | unsigned long *total_scanned); | |
a63d83f4 | 240 | |
68ae564b DR |
241 | void __mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx); |
242 | static inline void mem_cgroup_count_vm_event(struct mm_struct *mm, | |
243 | enum vm_event_item idx) | |
244 | { | |
245 | if (mem_cgroup_disabled()) | |
246 | return; | |
247 | __mem_cgroup_count_vm_event(mm, idx); | |
248 | } | |
ca3e0214 | 249 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
e94c8a9c | 250 | void mem_cgroup_split_huge_fixup(struct page *head); |
ca3e0214 KH |
251 | #endif |
252 | ||
f212ad7c DN |
253 | #ifdef CONFIG_DEBUG_VM |
254 | bool mem_cgroup_bad_page_check(struct page *page); | |
255 | void mem_cgroup_print_bad_page(struct page *page); | |
256 | #endif | |
c255a458 | 257 | #else /* CONFIG_MEMCG */ |
7a81b88c KH |
258 | struct mem_cgroup; |
259 | ||
260 | static inline int mem_cgroup_newpage_charge(struct page *page, | |
8289546e | 261 | struct mm_struct *mm, gfp_t gfp_mask) |
8a9f3ccd BS |
262 | { |
263 | return 0; | |
264 | } | |
265 | ||
8289546e HD |
266 | static inline int mem_cgroup_cache_charge(struct page *page, |
267 | struct mm_struct *mm, gfp_t gfp_mask) | |
8a9f3ccd | 268 | { |
8289546e | 269 | return 0; |
8a9f3ccd BS |
270 | } |
271 | ||
8c7c6e34 | 272 | static inline int mem_cgroup_try_charge_swapin(struct mm_struct *mm, |
72835c86 | 273 | struct page *page, gfp_t gfp_mask, struct mem_cgroup **memcgp) |
7a81b88c KH |
274 | { |
275 | return 0; | |
276 | } | |
277 | ||
278 | static inline void mem_cgroup_commit_charge_swapin(struct page *page, | |
72835c86 | 279 | struct mem_cgroup *memcg) |
7a81b88c KH |
280 | { |
281 | } | |
282 | ||
72835c86 | 283 | static inline void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *memcg) |
7a81b88c KH |
284 | { |
285 | } | |
286 | ||
569b846d KH |
287 | static inline void mem_cgroup_uncharge_start(void) |
288 | { | |
289 | } | |
290 | ||
291 | static inline void mem_cgroup_uncharge_end(void) | |
292 | { | |
293 | } | |
294 | ||
8a9f3ccd BS |
295 | static inline void mem_cgroup_uncharge_page(struct page *page) |
296 | { | |
297 | } | |
298 | ||
69029cd5 KH |
299 | static inline void mem_cgroup_uncharge_cache_page(struct page *page) |
300 | { | |
301 | } | |
302 | ||
925b7673 JW |
303 | static inline struct lruvec *mem_cgroup_zone_lruvec(struct zone *zone, |
304 | struct mem_cgroup *memcg) | |
08e552c6 | 305 | { |
925b7673 | 306 | return &zone->lruvec; |
08e552c6 KH |
307 | } |
308 | ||
fa9add64 HD |
309 | static inline struct lruvec *mem_cgroup_page_lruvec(struct page *page, |
310 | struct zone *zone) | |
66e1707b | 311 | { |
925b7673 | 312 | return &zone->lruvec; |
66e1707b BS |
313 | } |
314 | ||
e42d9d5d WF |
315 | static inline struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page) |
316 | { | |
317 | return NULL; | |
318 | } | |
319 | ||
a433658c KM |
320 | static inline struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm) |
321 | { | |
322 | return NULL; | |
323 | } | |
324 | ||
587af308 | 325 | static inline bool mm_match_cgroup(struct mm_struct *mm, |
c0ff4b85 | 326 | struct mem_cgroup *memcg) |
bed7161a | 327 | { |
587af308 | 328 | return true; |
bed7161a BS |
329 | } |
330 | ||
ffbdccf5 DR |
331 | static inline bool task_in_mem_cgroup(struct task_struct *task, |
332 | const struct mem_cgroup *memcg) | |
4c4a2214 | 333 | { |
ffbdccf5 | 334 | return true; |
4c4a2214 DR |
335 | } |
336 | ||
c0ff4b85 R |
337 | static inline struct cgroup_subsys_state |
338 | *mem_cgroup_css(struct mem_cgroup *memcg) | |
d324236b WF |
339 | { |
340 | return NULL; | |
341 | } | |
342 | ||
0030f535 | 343 | static inline void |
ac39cf8c | 344 | mem_cgroup_prepare_migration(struct page *page, struct page *newpage, |
0030f535 | 345 | struct mem_cgroup **memcgp) |
ae41be37 | 346 | { |
ae41be37 KH |
347 | } |
348 | ||
c0ff4b85 | 349 | static inline void mem_cgroup_end_migration(struct mem_cgroup *memcg, |
50de1dd9 | 350 | struct page *oldpage, struct page *newpage, bool migration_ok) |
ae41be37 KH |
351 | { |
352 | } | |
353 | ||
5660048c JW |
354 | static inline struct mem_cgroup * |
355 | mem_cgroup_iter(struct mem_cgroup *root, | |
356 | struct mem_cgroup *prev, | |
357 | struct mem_cgroup_reclaim_cookie *reclaim) | |
358 | { | |
359 | return NULL; | |
360 | } | |
361 | ||
362 | static inline void mem_cgroup_iter_break(struct mem_cgroup *root, | |
363 | struct mem_cgroup *prev) | |
364 | { | |
365 | } | |
366 | ||
f8d66542 HT |
367 | static inline bool mem_cgroup_disabled(void) |
368 | { | |
369 | return true; | |
370 | } | |
a636b327 | 371 | |
14797e23 | 372 | static inline int |
c56d5c7d | 373 | mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec) |
14797e23 KM |
374 | { |
375 | return 1; | |
376 | } | |
377 | ||
a3d8e054 | 378 | static inline unsigned long |
4d7dcca2 | 379 | mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list lru) |
a3d8e054 KM |
380 | { |
381 | return 0; | |
382 | } | |
383 | ||
fa9add64 HD |
384 | static inline void |
385 | mem_cgroup_update_lru_size(struct lruvec *lruvec, enum lru_list lru, | |
386 | int increment) | |
3e2f41f1 | 387 | { |
3e2f41f1 KM |
388 | } |
389 | ||
e222432b BS |
390 | static inline void |
391 | mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p) | |
392 | { | |
393 | } | |
394 | ||
89c06bd5 KH |
395 | static inline void mem_cgroup_begin_update_page_stat(struct page *page, |
396 | bool *locked, unsigned long *flags) | |
397 | { | |
398 | } | |
399 | ||
400 | static inline void mem_cgroup_end_update_page_stat(struct page *page, | |
401 | bool *locked, unsigned long *flags) | |
402 | { | |
403 | } | |
404 | ||
519e5247 JW |
405 | static inline bool mem_cgroup_toggle_oom(bool new) |
406 | { | |
407 | return false; | |
408 | } | |
409 | ||
410 | static inline void mem_cgroup_enable_oom(void) | |
411 | { | |
412 | } | |
413 | ||
414 | static inline void mem_cgroup_disable_oom(void) | |
415 | { | |
416 | } | |
417 | ||
3812c8c8 JW |
418 | static inline bool task_in_memcg_oom(struct task_struct *p) |
419 | { | |
420 | return false; | |
421 | } | |
422 | ||
423 | static inline bool mem_cgroup_oom_synchronize(void) | |
424 | { | |
425 | return false; | |
426 | } | |
427 | ||
2a7106f2 | 428 | static inline void mem_cgroup_inc_page_stat(struct page *page, |
68b4876d | 429 | enum mem_cgroup_stat_index idx) |
2a7106f2 GT |
430 | { |
431 | } | |
432 | ||
433 | static inline void mem_cgroup_dec_page_stat(struct page *page, | |
68b4876d | 434 | enum mem_cgroup_stat_index idx) |
d69b042f BS |
435 | { |
436 | } | |
437 | ||
4e416953 | 438 | static inline |
0608f43d AM |
439 | unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order, |
440 | gfp_t gfp_mask, | |
441 | unsigned long *total_scanned) | |
4e416953 | 442 | { |
0608f43d | 443 | return 0; |
4e416953 BS |
444 | } |
445 | ||
e94c8a9c | 446 | static inline void mem_cgroup_split_huge_fixup(struct page *head) |
ca3e0214 KH |
447 | { |
448 | } | |
449 | ||
456f998e YH |
450 | static inline |
451 | void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx) | |
452 | { | |
453 | } | |
ab936cbc KH |
454 | static inline void mem_cgroup_replace_page_cache(struct page *oldpage, |
455 | struct page *newpage) | |
456 | { | |
457 | } | |
c255a458 | 458 | #endif /* CONFIG_MEMCG */ |
78fb7466 | 459 | |
c255a458 | 460 | #if !defined(CONFIG_MEMCG) || !defined(CONFIG_DEBUG_VM) |
f212ad7c DN |
461 | static inline bool |
462 | mem_cgroup_bad_page_check(struct page *page) | |
463 | { | |
464 | return false; | |
465 | } | |
466 | ||
467 | static inline void | |
468 | mem_cgroup_print_bad_page(struct page *page) | |
469 | { | |
470 | } | |
471 | #endif | |
472 | ||
e1aab161 GC |
473 | enum { |
474 | UNDER_LIMIT, | |
475 | SOFT_LIMIT, | |
476 | OVER_LIMIT, | |
477 | }; | |
478 | ||
479 | struct sock; | |
cd59085a | 480 | #if defined(CONFIG_INET) && defined(CONFIG_MEMCG_KMEM) |
e1aab161 GC |
481 | void sock_update_memcg(struct sock *sk); |
482 | void sock_release_memcg(struct sock *sk); | |
483 | #else | |
484 | static inline void sock_update_memcg(struct sock *sk) | |
485 | { | |
486 | } | |
487 | static inline void sock_release_memcg(struct sock *sk) | |
488 | { | |
489 | } | |
cd59085a | 490 | #endif /* CONFIG_INET && CONFIG_MEMCG_KMEM */ |
7ae1e1d0 GC |
491 | |
492 | #ifdef CONFIG_MEMCG_KMEM | |
a8964b9b | 493 | extern struct static_key memcg_kmem_enabled_key; |
749c5415 GC |
494 | |
495 | extern int memcg_limited_groups_array_size; | |
ebe945c2 GC |
496 | |
497 | /* | |
498 | * Helper macro to loop through all memcg-specific caches. Callers must still | |
499 | * check if the cache is valid (it is either valid or NULL). | |
500 | * the slab_mutex must be held when looping through those caches | |
501 | */ | |
749c5415 | 502 | #define for_each_memcg_cache_index(_idx) \ |
91c777d8 | 503 | for ((_idx) = 0; (_idx) < memcg_limited_groups_array_size; (_idx)++) |
749c5415 | 504 | |
7ae1e1d0 GC |
505 | static inline bool memcg_kmem_enabled(void) |
506 | { | |
a8964b9b | 507 | return static_key_false(&memcg_kmem_enabled_key); |
7ae1e1d0 GC |
508 | } |
509 | ||
510 | /* | |
511 | * In general, we'll do everything in our power to not incur in any overhead | |
512 | * for non-memcg users for the kmem functions. Not even a function call, if we | |
513 | * can avoid it. | |
514 | * | |
515 | * Therefore, we'll inline all those functions so that in the best case, we'll | |
516 | * see that kmemcg is off for everybody and proceed quickly. If it is on, | |
517 | * we'll still do most of the flag checking inline. We check a lot of | |
518 | * conditions, but because they are pretty simple, they are expected to be | |
519 | * fast. | |
520 | */ | |
521 | bool __memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg, | |
522 | int order); | |
523 | void __memcg_kmem_commit_charge(struct page *page, | |
524 | struct mem_cgroup *memcg, int order); | |
525 | void __memcg_kmem_uncharge_pages(struct page *page, int order); | |
526 | ||
2633d7a0 | 527 | int memcg_cache_id(struct mem_cgroup *memcg); |
943a451a GC |
528 | int memcg_register_cache(struct mem_cgroup *memcg, struct kmem_cache *s, |
529 | struct kmem_cache *root_cache); | |
2633d7a0 GC |
530 | void memcg_release_cache(struct kmem_cache *cachep); |
531 | void memcg_cache_list_add(struct mem_cgroup *memcg, struct kmem_cache *cachep); | |
532 | ||
55007d84 GC |
533 | int memcg_update_cache_size(struct kmem_cache *s, int num_groups); |
534 | void memcg_update_array_size(int num_groups); | |
d7f25f8a GC |
535 | |
536 | struct kmem_cache * | |
537 | __memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp); | |
538 | ||
1f458cbf | 539 | void mem_cgroup_destroy_cache(struct kmem_cache *cachep); |
7cf27982 | 540 | void kmem_cache_destroy_memcg_children(struct kmem_cache *s); |
1f458cbf | 541 | |
7ae1e1d0 GC |
542 | /** |
543 | * memcg_kmem_newpage_charge: verify if a new kmem allocation is allowed. | |
544 | * @gfp: the gfp allocation flags. | |
545 | * @memcg: a pointer to the memcg this was charged against. | |
546 | * @order: allocation order. | |
547 | * | |
548 | * returns true if the memcg where the current task belongs can hold this | |
549 | * allocation. | |
550 | * | |
551 | * We return true automatically if this allocation is not to be accounted to | |
552 | * any memcg. | |
553 | */ | |
554 | static inline bool | |
555 | memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg, int order) | |
556 | { | |
557 | if (!memcg_kmem_enabled()) | |
558 | return true; | |
559 | ||
560 | /* | |
561 | * __GFP_NOFAIL allocations will move on even if charging is not | |
562 | * possible. Therefore we don't even try, and have this allocation | |
563 | * unaccounted. We could in theory charge it with | |
564 | * res_counter_charge_nofail, but we hope those allocations are rare, | |
565 | * and won't be worth the trouble. | |
566 | */ | |
567 | if (!(gfp & __GFP_KMEMCG) || (gfp & __GFP_NOFAIL)) | |
568 | return true; | |
569 | if (in_interrupt() || (!current->mm) || (current->flags & PF_KTHREAD)) | |
570 | return true; | |
571 | ||
572 | /* If the test is dying, just let it go. */ | |
573 | if (unlikely(fatal_signal_pending(current))) | |
574 | return true; | |
575 | ||
576 | return __memcg_kmem_newpage_charge(gfp, memcg, order); | |
577 | } | |
578 | ||
579 | /** | |
580 | * memcg_kmem_uncharge_pages: uncharge pages from memcg | |
581 | * @page: pointer to struct page being freed | |
582 | * @order: allocation order. | |
583 | * | |
584 | * there is no need to specify memcg here, since it is embedded in page_cgroup | |
585 | */ | |
586 | static inline void | |
587 | memcg_kmem_uncharge_pages(struct page *page, int order) | |
588 | { | |
589 | if (memcg_kmem_enabled()) | |
590 | __memcg_kmem_uncharge_pages(page, order); | |
591 | } | |
592 | ||
593 | /** | |
594 | * memcg_kmem_commit_charge: embeds correct memcg in a page | |
595 | * @page: pointer to struct page recently allocated | |
596 | * @memcg: the memcg structure we charged against | |
597 | * @order: allocation order. | |
598 | * | |
599 | * Needs to be called after memcg_kmem_newpage_charge, regardless of success or | |
600 | * failure of the allocation. if @page is NULL, this function will revert the | |
601 | * charges. Otherwise, it will commit the memcg given by @memcg to the | |
602 | * corresponding page_cgroup. | |
603 | */ | |
604 | static inline void | |
605 | memcg_kmem_commit_charge(struct page *page, struct mem_cgroup *memcg, int order) | |
606 | { | |
607 | if (memcg_kmem_enabled() && memcg) | |
608 | __memcg_kmem_commit_charge(page, memcg, order); | |
609 | } | |
610 | ||
d7f25f8a GC |
611 | /** |
612 | * memcg_kmem_get_cache: selects the correct per-memcg cache for allocation | |
613 | * @cachep: the original global kmem cache | |
614 | * @gfp: allocation flags. | |
615 | * | |
616 | * This function assumes that the task allocating, which determines the memcg | |
617 | * in the page allocator, belongs to the same cgroup throughout the whole | |
618 | * process. Misacounting can happen if the task calls memcg_kmem_get_cache() | |
619 | * while belonging to a cgroup, and later on changes. This is considered | |
620 | * acceptable, and should only happen upon task migration. | |
621 | * | |
622 | * Before the cache is created by the memcg core, there is also a possible | |
623 | * imbalance: the task belongs to a memcg, but the cache being allocated from | |
624 | * is the global cache, since the child cache is not yet guaranteed to be | |
625 | * ready. This case is also fine, since in this case the GFP_KMEMCG will not be | |
626 | * passed and the page allocator will not attempt any cgroup accounting. | |
627 | */ | |
628 | static __always_inline struct kmem_cache * | |
629 | memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp) | |
630 | { | |
631 | if (!memcg_kmem_enabled()) | |
632 | return cachep; | |
633 | if (gfp & __GFP_NOFAIL) | |
634 | return cachep; | |
635 | if (in_interrupt() || (!current->mm) || (current->flags & PF_KTHREAD)) | |
636 | return cachep; | |
637 | if (unlikely(fatal_signal_pending(current))) | |
638 | return cachep; | |
639 | ||
640 | return __memcg_kmem_get_cache(cachep, gfp); | |
641 | } | |
7ae1e1d0 | 642 | #else |
749c5415 GC |
643 | #define for_each_memcg_cache_index(_idx) \ |
644 | for (; NULL; ) | |
645 | ||
b9ce5ef4 GC |
646 | static inline bool memcg_kmem_enabled(void) |
647 | { | |
648 | return false; | |
649 | } | |
650 | ||
7ae1e1d0 GC |
651 | static inline bool |
652 | memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg, int order) | |
653 | { | |
654 | return true; | |
655 | } | |
656 | ||
657 | static inline void memcg_kmem_uncharge_pages(struct page *page, int order) | |
658 | { | |
659 | } | |
660 | ||
661 | static inline void | |
662 | memcg_kmem_commit_charge(struct page *page, struct mem_cgroup *memcg, int order) | |
663 | { | |
664 | } | |
2633d7a0 GC |
665 | |
666 | static inline int memcg_cache_id(struct mem_cgroup *memcg) | |
667 | { | |
668 | return -1; | |
669 | } | |
670 | ||
943a451a GC |
671 | static inline int |
672 | memcg_register_cache(struct mem_cgroup *memcg, struct kmem_cache *s, | |
673 | struct kmem_cache *root_cache) | |
2633d7a0 GC |
674 | { |
675 | return 0; | |
676 | } | |
677 | ||
678 | static inline void memcg_release_cache(struct kmem_cache *cachep) | |
679 | { | |
680 | } | |
681 | ||
682 | static inline void memcg_cache_list_add(struct mem_cgroup *memcg, | |
683 | struct kmem_cache *s) | |
684 | { | |
685 | } | |
d7f25f8a GC |
686 | |
687 | static inline struct kmem_cache * | |
688 | memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp) | |
689 | { | |
690 | return cachep; | |
691 | } | |
7cf27982 GC |
692 | |
693 | static inline void kmem_cache_destroy_memcg_children(struct kmem_cache *s) | |
694 | { | |
695 | } | |
7ae1e1d0 | 696 | #endif /* CONFIG_MEMCG_KMEM */ |
8cdea7c0 BS |
697 | #endif /* _LINUX_MEMCONTROL_H */ |
698 |