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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> |
33398cf2 MH |
26 | #include <linux/page_counter.h> |
27 | #include <linux/vmpressure.h> | |
28 | #include <linux/eventfd.h> | |
29 | #include <linux/mmzone.h> | |
30 | #include <linux/writeback.h> | |
456f998e | 31 | |
78fb7466 | 32 | struct mem_cgroup; |
8697d331 BS |
33 | struct page; |
34 | struct mm_struct; | |
2633d7a0 | 35 | struct kmem_cache; |
78fb7466 | 36 | |
68b4876d SZ |
37 | /* |
38 | * The corresponding mem_cgroup_stat_names is defined in mm/memcontrol.c, | |
39 | * These two lists should keep in accord with each other. | |
40 | */ | |
41 | enum mem_cgroup_stat_index { | |
42 | /* | |
43 | * For MEM_CONTAINER_TYPE_ALL, usage = pagecache + rss. | |
44 | */ | |
45 | MEM_CGROUP_STAT_CACHE, /* # of pages charged as cache */ | |
46 | MEM_CGROUP_STAT_RSS, /* # of pages charged as anon rss */ | |
47 | MEM_CGROUP_STAT_RSS_HUGE, /* # of pages charged as anon huge */ | |
48 | MEM_CGROUP_STAT_FILE_MAPPED, /* # of pages charged as file rss */ | |
c4843a75 | 49 | MEM_CGROUP_STAT_DIRTY, /* # of dirty pages in page cache */ |
3ea67d06 | 50 | MEM_CGROUP_STAT_WRITEBACK, /* # of pages under writeback */ |
68b4876d SZ |
51 | MEM_CGROUP_STAT_SWAP, /* # of pages, swapped out */ |
52 | MEM_CGROUP_STAT_NSTATS, | |
2a7106f2 GT |
53 | }; |
54 | ||
5660048c JW |
55 | struct mem_cgroup_reclaim_cookie { |
56 | struct zone *zone; | |
57 | int priority; | |
58 | unsigned int generation; | |
59 | }; | |
60 | ||
241994ed JW |
61 | enum mem_cgroup_events_index { |
62 | MEM_CGROUP_EVENTS_PGPGIN, /* # of pages paged in */ | |
63 | MEM_CGROUP_EVENTS_PGPGOUT, /* # of pages paged out */ | |
64 | MEM_CGROUP_EVENTS_PGFAULT, /* # of page-faults */ | |
65 | MEM_CGROUP_EVENTS_PGMAJFAULT, /* # of major page-faults */ | |
66 | MEM_CGROUP_EVENTS_NSTATS, | |
67 | /* default hierarchy events */ | |
68 | MEMCG_LOW = MEM_CGROUP_EVENTS_NSTATS, | |
69 | MEMCG_HIGH, | |
70 | MEMCG_MAX, | |
71 | MEMCG_OOM, | |
72 | MEMCG_NR_EVENTS, | |
73 | }; | |
74 | ||
33398cf2 MH |
75 | /* |
76 | * Per memcg event counter is incremented at every pagein/pageout. With THP, | |
77 | * it will be incremated by the number of pages. This counter is used for | |
78 | * for trigger some periodic events. This is straightforward and better | |
79 | * than using jiffies etc. to handle periodic memcg event. | |
80 | */ | |
81 | enum mem_cgroup_events_target { | |
82 | MEM_CGROUP_TARGET_THRESH, | |
83 | MEM_CGROUP_TARGET_SOFTLIMIT, | |
84 | MEM_CGROUP_TARGET_NUMAINFO, | |
85 | MEM_CGROUP_NTARGETS, | |
86 | }; | |
87 | ||
33398cf2 MH |
88 | struct cg_proto { |
89 | struct page_counter memory_allocated; /* Current allocated memory. */ | |
33398cf2 | 90 | int memory_pressure; |
9ee11ba4 | 91 | bool active; |
33398cf2 MH |
92 | }; |
93 | ||
c255a458 | 94 | #ifdef CONFIG_MEMCG |
33398cf2 MH |
95 | struct mem_cgroup_stat_cpu { |
96 | long count[MEM_CGROUP_STAT_NSTATS]; | |
97 | unsigned long events[MEMCG_NR_EVENTS]; | |
98 | unsigned long nr_page_events; | |
99 | unsigned long targets[MEM_CGROUP_NTARGETS]; | |
100 | }; | |
101 | ||
102 | struct mem_cgroup_reclaim_iter { | |
103 | struct mem_cgroup *position; | |
104 | /* scan generation, increased every round-trip */ | |
105 | unsigned int generation; | |
106 | }; | |
107 | ||
108 | /* | |
109 | * per-zone information in memory controller. | |
110 | */ | |
111 | struct mem_cgroup_per_zone { | |
112 | struct lruvec lruvec; | |
113 | unsigned long lru_size[NR_LRU_LISTS]; | |
114 | ||
115 | struct mem_cgroup_reclaim_iter iter[DEF_PRIORITY + 1]; | |
116 | ||
117 | struct rb_node tree_node; /* RB tree node */ | |
118 | unsigned long usage_in_excess;/* Set to the value by which */ | |
119 | /* the soft limit is exceeded*/ | |
120 | bool on_tree; | |
121 | struct mem_cgroup *memcg; /* Back pointer, we cannot */ | |
122 | /* use container_of */ | |
123 | }; | |
124 | ||
125 | struct mem_cgroup_per_node { | |
126 | struct mem_cgroup_per_zone zoneinfo[MAX_NR_ZONES]; | |
127 | }; | |
128 | ||
129 | struct mem_cgroup_threshold { | |
130 | struct eventfd_ctx *eventfd; | |
131 | unsigned long threshold; | |
132 | }; | |
133 | ||
134 | /* For threshold */ | |
135 | struct mem_cgroup_threshold_ary { | |
136 | /* An array index points to threshold just below or equal to usage. */ | |
137 | int current_threshold; | |
138 | /* Size of entries[] */ | |
139 | unsigned int size; | |
140 | /* Array of thresholds */ | |
141 | struct mem_cgroup_threshold entries[0]; | |
142 | }; | |
143 | ||
144 | struct mem_cgroup_thresholds { | |
145 | /* Primary thresholds array */ | |
146 | struct mem_cgroup_threshold_ary *primary; | |
147 | /* | |
148 | * Spare threshold array. | |
149 | * This is needed to make mem_cgroup_unregister_event() "never fail". | |
150 | * It must be able to store at least primary->size - 1 entries. | |
151 | */ | |
152 | struct mem_cgroup_threshold_ary *spare; | |
153 | }; | |
154 | ||
155 | /* | |
156 | * The memory controller data structure. The memory controller controls both | |
157 | * page cache and RSS per cgroup. We would eventually like to provide | |
158 | * statistics based on the statistics developed by Rik Van Riel for clock-pro, | |
159 | * to help the administrator determine what knobs to tune. | |
160 | */ | |
161 | struct mem_cgroup { | |
162 | struct cgroup_subsys_state css; | |
163 | ||
164 | /* Accounted resources */ | |
165 | struct page_counter memory; | |
166 | struct page_counter memsw; | |
167 | struct page_counter kmem; | |
168 | ||
169 | /* Normal memory consumption range */ | |
170 | unsigned long low; | |
171 | unsigned long high; | |
172 | ||
f7e1cb6e JW |
173 | /* Range enforcement for interrupt charges */ |
174 | struct work_struct high_work; | |
175 | ||
33398cf2 MH |
176 | unsigned long soft_limit; |
177 | ||
178 | /* vmpressure notifications */ | |
179 | struct vmpressure vmpressure; | |
180 | ||
181 | /* css_online() has been completed */ | |
182 | int initialized; | |
183 | ||
184 | /* | |
185 | * Should the accounting and control be hierarchical, per subtree? | |
186 | */ | |
187 | bool use_hierarchy; | |
188 | ||
189 | /* protected by memcg_oom_lock */ | |
190 | bool oom_lock; | |
191 | int under_oom; | |
192 | ||
193 | int swappiness; | |
194 | /* OOM-Killer disable */ | |
195 | int oom_kill_disable; | |
196 | ||
472912a2 TH |
197 | /* handle for "memory.events" */ |
198 | struct cgroup_file events_file; | |
199 | ||
33398cf2 MH |
200 | /* protect arrays of thresholds */ |
201 | struct mutex thresholds_lock; | |
202 | ||
203 | /* thresholds for memory usage. RCU-protected */ | |
204 | struct mem_cgroup_thresholds thresholds; | |
205 | ||
206 | /* thresholds for mem+swap usage. RCU-protected */ | |
207 | struct mem_cgroup_thresholds memsw_thresholds; | |
208 | ||
209 | /* For oom notifier event fd */ | |
210 | struct list_head oom_notify; | |
211 | ||
212 | /* | |
213 | * Should we move charges of a task when a task is moved into this | |
214 | * mem_cgroup ? And what type of charges should we move ? | |
215 | */ | |
216 | unsigned long move_charge_at_immigrate; | |
217 | /* | |
218 | * set > 0 if pages under this cgroup are moving to other cgroup. | |
219 | */ | |
220 | atomic_t moving_account; | |
221 | /* taken only while moving_account > 0 */ | |
222 | spinlock_t move_lock; | |
223 | struct task_struct *move_lock_task; | |
224 | unsigned long move_lock_flags; | |
225 | /* | |
226 | * percpu counter. | |
227 | */ | |
228 | struct mem_cgroup_stat_cpu __percpu *stat; | |
33398cf2 MH |
229 | |
230 | #if defined(CONFIG_MEMCG_KMEM) && defined(CONFIG_INET) | |
231 | struct cg_proto tcp_mem; | |
232 | #endif | |
233 | #if defined(CONFIG_MEMCG_KMEM) | |
234 | /* Index in the kmem_cache->memcg_params.memcg_caches array */ | |
235 | int kmemcg_id; | |
236 | bool kmem_acct_activated; | |
237 | bool kmem_acct_active; | |
238 | #endif | |
239 | ||
240 | int last_scanned_node; | |
241 | #if MAX_NUMNODES > 1 | |
242 | nodemask_t scan_nodes; | |
243 | atomic_t numainfo_events; | |
244 | atomic_t numainfo_updating; | |
245 | #endif | |
246 | ||
247 | #ifdef CONFIG_CGROUP_WRITEBACK | |
248 | struct list_head cgwb_list; | |
249 | struct wb_domain cgwb_domain; | |
250 | #endif | |
251 | ||
8e8ae645 JW |
252 | #ifdef CONFIG_INET |
253 | unsigned long socket_pressure; | |
254 | #endif | |
255 | ||
33398cf2 MH |
256 | /* List of events which userspace want to receive */ |
257 | struct list_head event_list; | |
258 | spinlock_t event_list_lock; | |
259 | ||
260 | struct mem_cgroup_per_node *nodeinfo[0]; | |
261 | /* WARNING: nodeinfo must be the last member here */ | |
262 | }; | |
7d828602 JW |
263 | |
264 | extern struct mem_cgroup *root_mem_cgroup; | |
56161634 | 265 | |
33398cf2 MH |
266 | /** |
267 | * mem_cgroup_events - count memory events against a cgroup | |
268 | * @memcg: the memory cgroup | |
269 | * @idx: the event index | |
270 | * @nr: the number of events to account for | |
271 | */ | |
272 | static inline void mem_cgroup_events(struct mem_cgroup *memcg, | |
241994ed | 273 | enum mem_cgroup_events_index idx, |
33398cf2 MH |
274 | unsigned int nr) |
275 | { | |
276 | this_cpu_add(memcg->stat->events[idx], nr); | |
472912a2 | 277 | cgroup_file_notify(&memcg->events_file); |
33398cf2 | 278 | } |
241994ed JW |
279 | |
280 | bool mem_cgroup_low(struct mem_cgroup *root, struct mem_cgroup *memcg); | |
281 | ||
00501b53 JW |
282 | int mem_cgroup_try_charge(struct page *page, struct mm_struct *mm, |
283 | gfp_t gfp_mask, struct mem_cgroup **memcgp); | |
284 | void mem_cgroup_commit_charge(struct page *page, struct mem_cgroup *memcg, | |
285 | bool lrucare); | |
286 | void mem_cgroup_cancel_charge(struct page *page, struct mem_cgroup *memcg); | |
0a31bc97 | 287 | void mem_cgroup_uncharge(struct page *page); |
747db954 | 288 | void mem_cgroup_uncharge_list(struct list_head *page_list); |
569b846d | 289 | |
45637bab | 290 | void mem_cgroup_replace_page(struct page *oldpage, struct page *newpage); |
569b846d | 291 | |
0a31bc97 JW |
292 | struct lruvec *mem_cgroup_zone_lruvec(struct zone *, struct mem_cgroup *); |
293 | struct lruvec *mem_cgroup_page_lruvec(struct page *, struct zone *); | |
c9b0ed51 | 294 | |
2314b42d | 295 | bool task_in_mem_cgroup(struct task_struct *task, struct mem_cgroup *memcg); |
64219994 | 296 | struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p); |
e993d905 | 297 | |
33398cf2 MH |
298 | static inline |
299 | struct mem_cgroup *mem_cgroup_from_css(struct cgroup_subsys_state *css){ | |
300 | return css ? container_of(css, struct mem_cgroup, css) : NULL; | |
301 | } | |
302 | ||
8e8ae645 JW |
303 | #define mem_cgroup_from_counter(counter, member) \ |
304 | container_of(counter, struct mem_cgroup, member) | |
305 | ||
33398cf2 MH |
306 | struct mem_cgroup *mem_cgroup_iter(struct mem_cgroup *, |
307 | struct mem_cgroup *, | |
308 | struct mem_cgroup_reclaim_cookie *); | |
309 | void mem_cgroup_iter_break(struct mem_cgroup *, struct mem_cgroup *); | |
310 | ||
8e8ae645 JW |
311 | /** |
312 | * parent_mem_cgroup - find the accounting parent of a memcg | |
313 | * @memcg: memcg whose parent to find | |
314 | * | |
315 | * Returns the parent memcg, or NULL if this is the root or the memory | |
316 | * controller is in legacy no-hierarchy mode. | |
317 | */ | |
318 | static inline struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg) | |
319 | { | |
320 | if (!memcg->memory.parent) | |
321 | return NULL; | |
322 | return mem_cgroup_from_counter(memcg->memory.parent, memory); | |
323 | } | |
324 | ||
33398cf2 MH |
325 | static inline bool mem_cgroup_is_descendant(struct mem_cgroup *memcg, |
326 | struct mem_cgroup *root) | |
327 | { | |
328 | if (root == memcg) | |
329 | return true; | |
330 | if (!root->use_hierarchy) | |
331 | return false; | |
332 | return cgroup_is_descendant(memcg->css.cgroup, root->css.cgroup); | |
333 | } | |
e1aab161 | 334 | |
2314b42d JW |
335 | static inline bool mm_match_cgroup(struct mm_struct *mm, |
336 | struct mem_cgroup *memcg) | |
2e4d4091 | 337 | { |
587af308 | 338 | struct mem_cgroup *task_memcg; |
413918bb | 339 | bool match = false; |
c3ac9a8a | 340 | |
2e4d4091 | 341 | rcu_read_lock(); |
587af308 | 342 | task_memcg = mem_cgroup_from_task(rcu_dereference(mm->owner)); |
413918bb | 343 | if (task_memcg) |
2314b42d | 344 | match = mem_cgroup_is_descendant(task_memcg, memcg); |
2e4d4091 | 345 | rcu_read_unlock(); |
c3ac9a8a | 346 | return match; |
2e4d4091 | 347 | } |
8a9f3ccd | 348 | |
64219994 | 349 | struct cgroup_subsys_state *mem_cgroup_css_from_page(struct page *page); |
2fc04524 | 350 | ino_t page_cgroup_ino(struct page *page); |
d324236b | 351 | |
33398cf2 MH |
352 | static inline bool mem_cgroup_disabled(void) |
353 | { | |
fc5ed1e9 | 354 | return !cgroup_subsys_enabled(memory_cgrp_subsys); |
33398cf2 | 355 | } |
5660048c | 356 | |
58ae83db KH |
357 | /* |
358 | * For memory reclaim. | |
359 | */ | |
889976db | 360 | int mem_cgroup_select_victim_node(struct mem_cgroup *memcg); |
33398cf2 MH |
361 | |
362 | void mem_cgroup_update_lru_size(struct lruvec *lruvec, enum lru_list lru, | |
363 | int nr_pages); | |
364 | ||
365 | static inline bool mem_cgroup_lruvec_online(struct lruvec *lruvec) | |
366 | { | |
367 | struct mem_cgroup_per_zone *mz; | |
368 | struct mem_cgroup *memcg; | |
369 | ||
370 | if (mem_cgroup_disabled()) | |
371 | return true; | |
372 | ||
373 | mz = container_of(lruvec, struct mem_cgroup_per_zone, lruvec); | |
374 | memcg = mz->memcg; | |
375 | ||
376 | return !!(memcg->css.flags & CSS_ONLINE); | |
377 | } | |
378 | ||
379 | static inline | |
380 | unsigned long mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list lru) | |
381 | { | |
382 | struct mem_cgroup_per_zone *mz; | |
383 | ||
384 | mz = container_of(lruvec, struct mem_cgroup_per_zone, lruvec); | |
385 | return mz->lru_size[lru]; | |
386 | } | |
387 | ||
13308ca9 | 388 | static inline bool mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec) |
33398cf2 MH |
389 | { |
390 | unsigned long inactive_ratio; | |
391 | unsigned long inactive; | |
392 | unsigned long active; | |
393 | unsigned long gb; | |
394 | ||
395 | inactive = mem_cgroup_get_lru_size(lruvec, LRU_INACTIVE_ANON); | |
396 | active = mem_cgroup_get_lru_size(lruvec, LRU_ACTIVE_ANON); | |
397 | ||
398 | gb = (inactive + active) >> (30 - PAGE_SHIFT); | |
399 | if (gb) | |
400 | inactive_ratio = int_sqrt(10 * gb); | |
401 | else | |
402 | inactive_ratio = 1; | |
403 | ||
404 | return inactive * inactive_ratio < active; | |
405 | } | |
406 | ||
b23afb93 TH |
407 | void mem_cgroup_handle_over_high(void); |
408 | ||
64219994 MH |
409 | void mem_cgroup_print_oom_info(struct mem_cgroup *memcg, |
410 | struct task_struct *p); | |
58ae83db | 411 | |
49426420 | 412 | static inline void mem_cgroup_oom_enable(void) |
519e5247 | 413 | { |
626ebc41 TH |
414 | WARN_ON(current->memcg_may_oom); |
415 | current->memcg_may_oom = 1; | |
519e5247 JW |
416 | } |
417 | ||
49426420 | 418 | static inline void mem_cgroup_oom_disable(void) |
519e5247 | 419 | { |
626ebc41 TH |
420 | WARN_ON(!current->memcg_may_oom); |
421 | current->memcg_may_oom = 0; | |
519e5247 JW |
422 | } |
423 | ||
3812c8c8 JW |
424 | static inline bool task_in_memcg_oom(struct task_struct *p) |
425 | { | |
626ebc41 | 426 | return p->memcg_in_oom; |
3812c8c8 JW |
427 | } |
428 | ||
49426420 | 429 | bool mem_cgroup_oom_synchronize(bool wait); |
3812c8c8 | 430 | |
c255a458 | 431 | #ifdef CONFIG_MEMCG_SWAP |
c077719b KH |
432 | extern int do_swap_account; |
433 | #endif | |
f8d66542 | 434 | |
6de22619 | 435 | struct mem_cgroup *mem_cgroup_begin_page_stat(struct page *page); |
6de22619 | 436 | void mem_cgroup_end_page_stat(struct mem_cgroup *memcg); |
d7365e78 | 437 | |
33398cf2 MH |
438 | /** |
439 | * mem_cgroup_update_page_stat - update page state statistics | |
440 | * @memcg: memcg to account against | |
441 | * @idx: page state item to account | |
442 | * @val: number of pages (positive or negative) | |
443 | * | |
444 | * See mem_cgroup_begin_page_stat() for locking requirements. | |
445 | */ | |
446 | static inline void mem_cgroup_update_page_stat(struct mem_cgroup *memcg, | |
447 | enum mem_cgroup_stat_index idx, int val) | |
448 | { | |
449 | VM_BUG_ON(!rcu_read_lock_held()); | |
450 | ||
451 | if (memcg) | |
452 | this_cpu_add(memcg->stat->count[idx], val); | |
453 | } | |
454 | ||
d7365e78 | 455 | static inline void mem_cgroup_inc_page_stat(struct mem_cgroup *memcg, |
68b4876d | 456 | enum mem_cgroup_stat_index idx) |
2a7106f2 | 457 | { |
d7365e78 | 458 | mem_cgroup_update_page_stat(memcg, idx, 1); |
2a7106f2 GT |
459 | } |
460 | ||
d7365e78 | 461 | static inline void mem_cgroup_dec_page_stat(struct mem_cgroup *memcg, |
68b4876d | 462 | enum mem_cgroup_stat_index idx) |
2a7106f2 | 463 | { |
d7365e78 | 464 | mem_cgroup_update_page_stat(memcg, idx, -1); |
2a7106f2 GT |
465 | } |
466 | ||
0608f43d AM |
467 | unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order, |
468 | gfp_t gfp_mask, | |
469 | unsigned long *total_scanned); | |
a63d83f4 | 470 | |
68ae564b DR |
471 | static inline void mem_cgroup_count_vm_event(struct mm_struct *mm, |
472 | enum vm_event_item idx) | |
473 | { | |
33398cf2 MH |
474 | struct mem_cgroup *memcg; |
475 | ||
68ae564b DR |
476 | if (mem_cgroup_disabled()) |
477 | return; | |
33398cf2 MH |
478 | |
479 | rcu_read_lock(); | |
480 | memcg = mem_cgroup_from_task(rcu_dereference(mm->owner)); | |
481 | if (unlikely(!memcg)) | |
482 | goto out; | |
483 | ||
484 | switch (idx) { | |
485 | case PGFAULT: | |
486 | this_cpu_inc(memcg->stat->events[MEM_CGROUP_EVENTS_PGFAULT]); | |
487 | break; | |
488 | case PGMAJFAULT: | |
489 | this_cpu_inc(memcg->stat->events[MEM_CGROUP_EVENTS_PGMAJFAULT]); | |
490 | break; | |
491 | default: | |
492 | BUG(); | |
493 | } | |
494 | out: | |
495 | rcu_read_unlock(); | |
68ae564b | 496 | } |
ca3e0214 | 497 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
e94c8a9c | 498 | void mem_cgroup_split_huge_fixup(struct page *head); |
ca3e0214 KH |
499 | #endif |
500 | ||
c255a458 | 501 | #else /* CONFIG_MEMCG */ |
7a81b88c KH |
502 | struct mem_cgroup; |
503 | ||
241994ed JW |
504 | static inline void mem_cgroup_events(struct mem_cgroup *memcg, |
505 | enum mem_cgroup_events_index idx, | |
506 | unsigned int nr) | |
507 | { | |
508 | } | |
509 | ||
510 | static inline bool mem_cgroup_low(struct mem_cgroup *root, | |
511 | struct mem_cgroup *memcg) | |
512 | { | |
513 | return false; | |
514 | } | |
515 | ||
00501b53 JW |
516 | static inline int mem_cgroup_try_charge(struct page *page, struct mm_struct *mm, |
517 | gfp_t gfp_mask, | |
518 | struct mem_cgroup **memcgp) | |
7a81b88c | 519 | { |
00501b53 | 520 | *memcgp = NULL; |
7a81b88c KH |
521 | return 0; |
522 | } | |
523 | ||
00501b53 JW |
524 | static inline void mem_cgroup_commit_charge(struct page *page, |
525 | struct mem_cgroup *memcg, | |
526 | bool lrucare) | |
7a81b88c KH |
527 | { |
528 | } | |
529 | ||
00501b53 JW |
530 | static inline void mem_cgroup_cancel_charge(struct page *page, |
531 | struct mem_cgroup *memcg) | |
7a81b88c KH |
532 | { |
533 | } | |
534 | ||
0a31bc97 | 535 | static inline void mem_cgroup_uncharge(struct page *page) |
569b846d KH |
536 | { |
537 | } | |
538 | ||
747db954 | 539 | static inline void mem_cgroup_uncharge_list(struct list_head *page_list) |
8a9f3ccd BS |
540 | { |
541 | } | |
542 | ||
45637bab | 543 | static inline void mem_cgroup_replace_page(struct page *old, struct page *new) |
69029cd5 KH |
544 | { |
545 | } | |
546 | ||
925b7673 JW |
547 | static inline struct lruvec *mem_cgroup_zone_lruvec(struct zone *zone, |
548 | struct mem_cgroup *memcg) | |
08e552c6 | 549 | { |
925b7673 | 550 | return &zone->lruvec; |
08e552c6 KH |
551 | } |
552 | ||
fa9add64 HD |
553 | static inline struct lruvec *mem_cgroup_page_lruvec(struct page *page, |
554 | struct zone *zone) | |
66e1707b | 555 | { |
925b7673 | 556 | return &zone->lruvec; |
66e1707b BS |
557 | } |
558 | ||
587af308 | 559 | static inline bool mm_match_cgroup(struct mm_struct *mm, |
c0ff4b85 | 560 | struct mem_cgroup *memcg) |
bed7161a | 561 | { |
587af308 | 562 | return true; |
bed7161a BS |
563 | } |
564 | ||
ffbdccf5 DR |
565 | static inline bool task_in_mem_cgroup(struct task_struct *task, |
566 | const struct mem_cgroup *memcg) | |
4c4a2214 | 567 | { |
ffbdccf5 | 568 | return true; |
4c4a2214 DR |
569 | } |
570 | ||
5660048c JW |
571 | static inline struct mem_cgroup * |
572 | mem_cgroup_iter(struct mem_cgroup *root, | |
573 | struct mem_cgroup *prev, | |
574 | struct mem_cgroup_reclaim_cookie *reclaim) | |
575 | { | |
576 | return NULL; | |
577 | } | |
578 | ||
579 | static inline void mem_cgroup_iter_break(struct mem_cgroup *root, | |
580 | struct mem_cgroup *prev) | |
581 | { | |
582 | } | |
583 | ||
f8d66542 HT |
584 | static inline bool mem_cgroup_disabled(void) |
585 | { | |
586 | return true; | |
587 | } | |
a636b327 | 588 | |
13308ca9 | 589 | static inline bool |
c56d5c7d | 590 | mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec) |
14797e23 | 591 | { |
13308ca9 | 592 | return true; |
14797e23 KM |
593 | } |
594 | ||
90cbc250 VD |
595 | static inline bool mem_cgroup_lruvec_online(struct lruvec *lruvec) |
596 | { | |
597 | return true; | |
598 | } | |
599 | ||
a3d8e054 | 600 | static inline unsigned long |
4d7dcca2 | 601 | mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list lru) |
a3d8e054 KM |
602 | { |
603 | return 0; | |
604 | } | |
605 | ||
fa9add64 HD |
606 | static inline void |
607 | mem_cgroup_update_lru_size(struct lruvec *lruvec, enum lru_list lru, | |
608 | int increment) | |
3e2f41f1 | 609 | { |
3e2f41f1 KM |
610 | } |
611 | ||
e222432b BS |
612 | static inline void |
613 | mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p) | |
614 | { | |
615 | } | |
616 | ||
6de22619 | 617 | static inline struct mem_cgroup *mem_cgroup_begin_page_stat(struct page *page) |
89c06bd5 | 618 | { |
d7365e78 | 619 | return NULL; |
89c06bd5 KH |
620 | } |
621 | ||
6de22619 | 622 | static inline void mem_cgroup_end_page_stat(struct mem_cgroup *memcg) |
89c06bd5 KH |
623 | { |
624 | } | |
625 | ||
b23afb93 TH |
626 | static inline void mem_cgroup_handle_over_high(void) |
627 | { | |
628 | } | |
629 | ||
49426420 | 630 | static inline void mem_cgroup_oom_enable(void) |
519e5247 JW |
631 | { |
632 | } | |
633 | ||
49426420 | 634 | static inline void mem_cgroup_oom_disable(void) |
519e5247 JW |
635 | { |
636 | } | |
637 | ||
3812c8c8 JW |
638 | static inline bool task_in_memcg_oom(struct task_struct *p) |
639 | { | |
640 | return false; | |
641 | } | |
642 | ||
49426420 | 643 | static inline bool mem_cgroup_oom_synchronize(bool wait) |
3812c8c8 JW |
644 | { |
645 | return false; | |
646 | } | |
647 | ||
d7365e78 | 648 | static inline void mem_cgroup_inc_page_stat(struct mem_cgroup *memcg, |
68b4876d | 649 | enum mem_cgroup_stat_index idx) |
2a7106f2 GT |
650 | { |
651 | } | |
652 | ||
d7365e78 | 653 | static inline void mem_cgroup_dec_page_stat(struct mem_cgroup *memcg, |
68b4876d | 654 | enum mem_cgroup_stat_index idx) |
d69b042f BS |
655 | { |
656 | } | |
657 | ||
4e416953 | 658 | static inline |
0608f43d AM |
659 | unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order, |
660 | gfp_t gfp_mask, | |
661 | unsigned long *total_scanned) | |
4e416953 | 662 | { |
0608f43d | 663 | return 0; |
4e416953 BS |
664 | } |
665 | ||
e94c8a9c | 666 | static inline void mem_cgroup_split_huge_fixup(struct page *head) |
ca3e0214 KH |
667 | { |
668 | } | |
669 | ||
456f998e YH |
670 | static inline |
671 | void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx) | |
672 | { | |
673 | } | |
c255a458 | 674 | #endif /* CONFIG_MEMCG */ |
78fb7466 | 675 | |
52ebea74 | 676 | #ifdef CONFIG_CGROUP_WRITEBACK |
841710aa | 677 | |
52ebea74 | 678 | struct list_head *mem_cgroup_cgwb_list(struct mem_cgroup *memcg); |
841710aa | 679 | struct wb_domain *mem_cgroup_wb_domain(struct bdi_writeback *wb); |
c5edf9cd TH |
680 | void mem_cgroup_wb_stats(struct bdi_writeback *wb, unsigned long *pfilepages, |
681 | unsigned long *pheadroom, unsigned long *pdirty, | |
682 | unsigned long *pwriteback); | |
841710aa TH |
683 | |
684 | #else /* CONFIG_CGROUP_WRITEBACK */ | |
685 | ||
686 | static inline struct wb_domain *mem_cgroup_wb_domain(struct bdi_writeback *wb) | |
687 | { | |
688 | return NULL; | |
689 | } | |
690 | ||
c2aa723a | 691 | static inline void mem_cgroup_wb_stats(struct bdi_writeback *wb, |
c5edf9cd TH |
692 | unsigned long *pfilepages, |
693 | unsigned long *pheadroom, | |
c2aa723a TH |
694 | unsigned long *pdirty, |
695 | unsigned long *pwriteback) | |
696 | { | |
697 | } | |
698 | ||
841710aa | 699 | #endif /* CONFIG_CGROUP_WRITEBACK */ |
52ebea74 | 700 | |
e1aab161 | 701 | struct sock; |
e1aab161 GC |
702 | void sock_update_memcg(struct sock *sk); |
703 | void sock_release_memcg(struct sock *sk); | |
baac50bb JW |
704 | bool mem_cgroup_charge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages); |
705 | void mem_cgroup_uncharge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages); | |
f7e1cb6e | 706 | #if defined(CONFIG_MEMCG) && defined(CONFIG_INET) |
80e95fe0 JW |
707 | extern struct static_key memcg_sockets_enabled_key; |
708 | #define mem_cgroup_sockets_enabled static_key_false(&memcg_sockets_enabled_key) | |
baac50bb | 709 | static inline bool mem_cgroup_under_socket_pressure(struct mem_cgroup *memcg) |
e805605c | 710 | { |
f7e1cb6e | 711 | #ifdef CONFIG_MEMCG_KMEM |
8e8ae645 JW |
712 | if (memcg->tcp_mem.memory_pressure) |
713 | return true; | |
f7e1cb6e | 714 | #endif |
8e8ae645 JW |
715 | do { |
716 | if (time_before(jiffies, memcg->socket_pressure)) | |
717 | return true; | |
718 | } while ((memcg = parent_mem_cgroup(memcg))); | |
719 | return false; | |
e805605c JW |
720 | } |
721 | #else | |
80e95fe0 | 722 | #define mem_cgroup_sockets_enabled 0 |
baac50bb | 723 | static inline bool mem_cgroup_under_socket_pressure(struct mem_cgroup *memcg) |
e805605c JW |
724 | { |
725 | return false; | |
726 | } | |
727 | #endif | |
7ae1e1d0 GC |
728 | |
729 | #ifdef CONFIG_MEMCG_KMEM | |
a8964b9b | 730 | extern struct static_key memcg_kmem_enabled_key; |
749c5415 | 731 | |
dbcf73e2 | 732 | extern int memcg_nr_cache_ids; |
64219994 MH |
733 | void memcg_get_cache_ids(void); |
734 | void memcg_put_cache_ids(void); | |
ebe945c2 GC |
735 | |
736 | /* | |
737 | * Helper macro to loop through all memcg-specific caches. Callers must still | |
738 | * check if the cache is valid (it is either valid or NULL). | |
739 | * the slab_mutex must be held when looping through those caches | |
740 | */ | |
749c5415 | 741 | #define for_each_memcg_cache_index(_idx) \ |
dbcf73e2 | 742 | for ((_idx) = 0; (_idx) < memcg_nr_cache_ids; (_idx)++) |
749c5415 | 743 | |
7ae1e1d0 GC |
744 | static inline bool memcg_kmem_enabled(void) |
745 | { | |
a8964b9b | 746 | return static_key_false(&memcg_kmem_enabled_key); |
7ae1e1d0 GC |
747 | } |
748 | ||
33398cf2 MH |
749 | static inline bool memcg_kmem_is_active(struct mem_cgroup *memcg) |
750 | { | |
751 | return memcg->kmem_acct_active; | |
752 | } | |
cb731d6c | 753 | |
7ae1e1d0 GC |
754 | /* |
755 | * In general, we'll do everything in our power to not incur in any overhead | |
756 | * for non-memcg users for the kmem functions. Not even a function call, if we | |
757 | * can avoid it. | |
758 | * | |
759 | * Therefore, we'll inline all those functions so that in the best case, we'll | |
760 | * see that kmemcg is off for everybody and proceed quickly. If it is on, | |
761 | * we'll still do most of the flag checking inline. We check a lot of | |
762 | * conditions, but because they are pretty simple, they are expected to be | |
763 | * fast. | |
764 | */ | |
f3ccb2c4 VD |
765 | int __memcg_kmem_charge_memcg(struct page *page, gfp_t gfp, int order, |
766 | struct mem_cgroup *memcg); | |
d05e83a6 VD |
767 | int __memcg_kmem_charge(struct page *page, gfp_t gfp, int order); |
768 | void __memcg_kmem_uncharge(struct page *page, int order); | |
7ae1e1d0 | 769 | |
33398cf2 MH |
770 | /* |
771 | * helper for acessing a memcg's index. It will be used as an index in the | |
772 | * child cache array in kmem_cache, and also to derive its name. This function | |
773 | * will return -1 when this is not a kmem-limited memcg. | |
774 | */ | |
775 | static inline int memcg_cache_id(struct mem_cgroup *memcg) | |
776 | { | |
777 | return memcg ? memcg->kmemcg_id : -1; | |
778 | } | |
5722d094 | 779 | |
230e9fc2 | 780 | struct kmem_cache *__memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp); |
8135be5a | 781 | void __memcg_kmem_put_cache(struct kmem_cache *cachep); |
d7f25f8a | 782 | |
230e9fc2 | 783 | static inline bool __memcg_kmem_bypass(void) |
7ae1e1d0 GC |
784 | { |
785 | if (!memcg_kmem_enabled()) | |
786 | return true; | |
7ae1e1d0 GC |
787 | if (in_interrupt() || (!current->mm) || (current->flags & PF_KTHREAD)) |
788 | return true; | |
cbfb4798 | 789 | return false; |
7ae1e1d0 GC |
790 | } |
791 | ||
792 | /** | |
d05e83a6 VD |
793 | * memcg_kmem_charge: charge a kmem page |
794 | * @page: page to charge | |
795 | * @gfp: reclaim mode | |
796 | * @order: allocation order | |
cbfb4798 | 797 | * |
d05e83a6 | 798 | * Returns 0 on success, an error code on failure. |
7ae1e1d0 | 799 | */ |
d05e83a6 VD |
800 | static __always_inline int memcg_kmem_charge(struct page *page, |
801 | gfp_t gfp, int order) | |
7ae1e1d0 | 802 | { |
230e9fc2 VD |
803 | if (__memcg_kmem_bypass()) |
804 | return 0; | |
805 | if (!(gfp & __GFP_ACCOUNT)) | |
d05e83a6 VD |
806 | return 0; |
807 | return __memcg_kmem_charge(page, gfp, order); | |
7ae1e1d0 GC |
808 | } |
809 | ||
810 | /** | |
d05e83a6 VD |
811 | * memcg_kmem_uncharge: uncharge a kmem page |
812 | * @page: page to uncharge | |
813 | * @order: allocation order | |
7ae1e1d0 | 814 | */ |
d05e83a6 | 815 | static __always_inline void memcg_kmem_uncharge(struct page *page, int order) |
7ae1e1d0 | 816 | { |
7ae1e1d0 | 817 | if (memcg_kmem_enabled()) |
d05e83a6 | 818 | __memcg_kmem_uncharge(page, order); |
7ae1e1d0 GC |
819 | } |
820 | ||
d7f25f8a GC |
821 | /** |
822 | * memcg_kmem_get_cache: selects the correct per-memcg cache for allocation | |
823 | * @cachep: the original global kmem cache | |
d7f25f8a | 824 | * |
5dfb4175 | 825 | * All memory allocated from a per-memcg cache is charged to the owner memcg. |
d7f25f8a GC |
826 | */ |
827 | static __always_inline struct kmem_cache * | |
828 | memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp) | |
829 | { | |
230e9fc2 | 830 | if (__memcg_kmem_bypass()) |
d7f25f8a | 831 | return cachep; |
230e9fc2 | 832 | return __memcg_kmem_get_cache(cachep, gfp); |
d7f25f8a | 833 | } |
8135be5a VD |
834 | |
835 | static __always_inline void memcg_kmem_put_cache(struct kmem_cache *cachep) | |
836 | { | |
837 | if (memcg_kmem_enabled()) | |
838 | __memcg_kmem_put_cache(cachep); | |
839 | } | |
7ae1e1d0 | 840 | #else |
749c5415 GC |
841 | #define for_each_memcg_cache_index(_idx) \ |
842 | for (; NULL; ) | |
843 | ||
b9ce5ef4 GC |
844 | static inline bool memcg_kmem_enabled(void) |
845 | { | |
846 | return false; | |
847 | } | |
848 | ||
cb731d6c VD |
849 | static inline bool memcg_kmem_is_active(struct mem_cgroup *memcg) |
850 | { | |
851 | return false; | |
852 | } | |
853 | ||
d05e83a6 | 854 | static inline int memcg_kmem_charge(struct page *page, gfp_t gfp, int order) |
7ae1e1d0 | 855 | { |
d05e83a6 | 856 | return 0; |
7ae1e1d0 GC |
857 | } |
858 | ||
d05e83a6 | 859 | static inline void memcg_kmem_uncharge(struct page *page, int order) |
7ae1e1d0 GC |
860 | { |
861 | } | |
2633d7a0 GC |
862 | |
863 | static inline int memcg_cache_id(struct mem_cgroup *memcg) | |
864 | { | |
865 | return -1; | |
866 | } | |
867 | ||
05257a1a VD |
868 | static inline void memcg_get_cache_ids(void) |
869 | { | |
870 | } | |
871 | ||
872 | static inline void memcg_put_cache_ids(void) | |
873 | { | |
874 | } | |
875 | ||
d7f25f8a GC |
876 | static inline struct kmem_cache * |
877 | memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp) | |
878 | { | |
879 | return cachep; | |
880 | } | |
8135be5a VD |
881 | |
882 | static inline void memcg_kmem_put_cache(struct kmem_cache *cachep) | |
883 | { | |
884 | } | |
7ae1e1d0 | 885 | #endif /* CONFIG_MEMCG_KMEM */ |
8cdea7c0 | 886 | #endif /* _LINUX_MEMCONTROL_H */ |