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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. */ | |
90 | struct percpu_counter sockets_allocated; /* Current number of sockets. */ | |
91 | int memory_pressure; | |
9ee11ba4 | 92 | bool active; |
33398cf2 | 93 | long sysctl_mem[3]; |
33398cf2 MH |
94 | /* |
95 | * memcg field is used to find which memcg we belong directly | |
96 | * Each memcg struct can hold more than one cg_proto, so container_of | |
97 | * won't really cut. | |
98 | * | |
99 | * The elegant solution would be having an inverse function to | |
100 | * proto_cgroup in struct proto, but that means polluting the structure | |
101 | * for everybody, instead of just for memcg users. | |
102 | */ | |
103 | struct mem_cgroup *memcg; | |
104 | }; | |
105 | ||
c255a458 | 106 | #ifdef CONFIG_MEMCG |
33398cf2 MH |
107 | struct mem_cgroup_stat_cpu { |
108 | long count[MEM_CGROUP_STAT_NSTATS]; | |
109 | unsigned long events[MEMCG_NR_EVENTS]; | |
110 | unsigned long nr_page_events; | |
111 | unsigned long targets[MEM_CGROUP_NTARGETS]; | |
112 | }; | |
113 | ||
114 | struct mem_cgroup_reclaim_iter { | |
115 | struct mem_cgroup *position; | |
116 | /* scan generation, increased every round-trip */ | |
117 | unsigned int generation; | |
118 | }; | |
119 | ||
120 | /* | |
121 | * per-zone information in memory controller. | |
122 | */ | |
123 | struct mem_cgroup_per_zone { | |
124 | struct lruvec lruvec; | |
125 | unsigned long lru_size[NR_LRU_LISTS]; | |
126 | ||
127 | struct mem_cgroup_reclaim_iter iter[DEF_PRIORITY + 1]; | |
128 | ||
129 | struct rb_node tree_node; /* RB tree node */ | |
130 | unsigned long usage_in_excess;/* Set to the value by which */ | |
131 | /* the soft limit is exceeded*/ | |
132 | bool on_tree; | |
133 | struct mem_cgroup *memcg; /* Back pointer, we cannot */ | |
134 | /* use container_of */ | |
135 | }; | |
136 | ||
137 | struct mem_cgroup_per_node { | |
138 | struct mem_cgroup_per_zone zoneinfo[MAX_NR_ZONES]; | |
139 | }; | |
140 | ||
141 | struct mem_cgroup_threshold { | |
142 | struct eventfd_ctx *eventfd; | |
143 | unsigned long threshold; | |
144 | }; | |
145 | ||
146 | /* For threshold */ | |
147 | struct mem_cgroup_threshold_ary { | |
148 | /* An array index points to threshold just below or equal to usage. */ | |
149 | int current_threshold; | |
150 | /* Size of entries[] */ | |
151 | unsigned int size; | |
152 | /* Array of thresholds */ | |
153 | struct mem_cgroup_threshold entries[0]; | |
154 | }; | |
155 | ||
156 | struct mem_cgroup_thresholds { | |
157 | /* Primary thresholds array */ | |
158 | struct mem_cgroup_threshold_ary *primary; | |
159 | /* | |
160 | * Spare threshold array. | |
161 | * This is needed to make mem_cgroup_unregister_event() "never fail". | |
162 | * It must be able to store at least primary->size - 1 entries. | |
163 | */ | |
164 | struct mem_cgroup_threshold_ary *spare; | |
165 | }; | |
166 | ||
167 | /* | |
168 | * The memory controller data structure. The memory controller controls both | |
169 | * page cache and RSS per cgroup. We would eventually like to provide | |
170 | * statistics based on the statistics developed by Rik Van Riel for clock-pro, | |
171 | * to help the administrator determine what knobs to tune. | |
172 | */ | |
173 | struct mem_cgroup { | |
174 | struct cgroup_subsys_state css; | |
175 | ||
176 | /* Accounted resources */ | |
177 | struct page_counter memory; | |
178 | struct page_counter memsw; | |
179 | struct page_counter kmem; | |
180 | ||
181 | /* Normal memory consumption range */ | |
182 | unsigned long low; | |
183 | unsigned long high; | |
184 | ||
185 | unsigned long soft_limit; | |
186 | ||
187 | /* vmpressure notifications */ | |
188 | struct vmpressure vmpressure; | |
189 | ||
190 | /* css_online() has been completed */ | |
191 | int initialized; | |
192 | ||
193 | /* | |
194 | * Should the accounting and control be hierarchical, per subtree? | |
195 | */ | |
196 | bool use_hierarchy; | |
197 | ||
198 | /* protected by memcg_oom_lock */ | |
199 | bool oom_lock; | |
200 | int under_oom; | |
201 | ||
202 | int swappiness; | |
203 | /* OOM-Killer disable */ | |
204 | int oom_kill_disable; | |
205 | ||
472912a2 TH |
206 | /* handle for "memory.events" */ |
207 | struct cgroup_file events_file; | |
208 | ||
33398cf2 MH |
209 | /* protect arrays of thresholds */ |
210 | struct mutex thresholds_lock; | |
211 | ||
212 | /* thresholds for memory usage. RCU-protected */ | |
213 | struct mem_cgroup_thresholds thresholds; | |
214 | ||
215 | /* thresholds for mem+swap usage. RCU-protected */ | |
216 | struct mem_cgroup_thresholds memsw_thresholds; | |
217 | ||
218 | /* For oom notifier event fd */ | |
219 | struct list_head oom_notify; | |
220 | ||
221 | /* | |
222 | * Should we move charges of a task when a task is moved into this | |
223 | * mem_cgroup ? And what type of charges should we move ? | |
224 | */ | |
225 | unsigned long move_charge_at_immigrate; | |
226 | /* | |
227 | * set > 0 if pages under this cgroup are moving to other cgroup. | |
228 | */ | |
229 | atomic_t moving_account; | |
230 | /* taken only while moving_account > 0 */ | |
231 | spinlock_t move_lock; | |
232 | struct task_struct *move_lock_task; | |
233 | unsigned long move_lock_flags; | |
234 | /* | |
235 | * percpu counter. | |
236 | */ | |
237 | struct mem_cgroup_stat_cpu __percpu *stat; | |
33398cf2 MH |
238 | |
239 | #if defined(CONFIG_MEMCG_KMEM) && defined(CONFIG_INET) | |
240 | struct cg_proto tcp_mem; | |
241 | #endif | |
242 | #if defined(CONFIG_MEMCG_KMEM) | |
243 | /* Index in the kmem_cache->memcg_params.memcg_caches array */ | |
244 | int kmemcg_id; | |
245 | bool kmem_acct_activated; | |
246 | bool kmem_acct_active; | |
247 | #endif | |
248 | ||
249 | int last_scanned_node; | |
250 | #if MAX_NUMNODES > 1 | |
251 | nodemask_t scan_nodes; | |
252 | atomic_t numainfo_events; | |
253 | atomic_t numainfo_updating; | |
254 | #endif | |
255 | ||
256 | #ifdef CONFIG_CGROUP_WRITEBACK | |
257 | struct list_head cgwb_list; | |
258 | struct wb_domain cgwb_domain; | |
259 | #endif | |
260 | ||
261 | /* List of events which userspace want to receive */ | |
262 | struct list_head event_list; | |
263 | spinlock_t event_list_lock; | |
264 | ||
265 | struct mem_cgroup_per_node *nodeinfo[0]; | |
266 | /* WARNING: nodeinfo must be the last member here */ | |
267 | }; | |
56161634 TH |
268 | extern struct cgroup_subsys_state *mem_cgroup_root_css; |
269 | ||
33398cf2 MH |
270 | /** |
271 | * mem_cgroup_events - count memory events against a cgroup | |
272 | * @memcg: the memory cgroup | |
273 | * @idx: the event index | |
274 | * @nr: the number of events to account for | |
275 | */ | |
276 | static inline void mem_cgroup_events(struct mem_cgroup *memcg, | |
241994ed | 277 | enum mem_cgroup_events_index idx, |
33398cf2 MH |
278 | unsigned int nr) |
279 | { | |
280 | this_cpu_add(memcg->stat->events[idx], nr); | |
472912a2 | 281 | cgroup_file_notify(&memcg->events_file); |
33398cf2 | 282 | } |
241994ed JW |
283 | |
284 | bool mem_cgroup_low(struct mem_cgroup *root, struct mem_cgroup *memcg); | |
285 | ||
00501b53 JW |
286 | int mem_cgroup_try_charge(struct page *page, struct mm_struct *mm, |
287 | gfp_t gfp_mask, struct mem_cgroup **memcgp); | |
288 | void mem_cgroup_commit_charge(struct page *page, struct mem_cgroup *memcg, | |
289 | bool lrucare); | |
290 | void mem_cgroup_cancel_charge(struct page *page, struct mem_cgroup *memcg); | |
0a31bc97 | 291 | void mem_cgroup_uncharge(struct page *page); |
747db954 | 292 | void mem_cgroup_uncharge_list(struct list_head *page_list); |
569b846d | 293 | |
45637bab | 294 | void mem_cgroup_replace_page(struct page *oldpage, struct page *newpage); |
569b846d | 295 | |
0a31bc97 JW |
296 | struct lruvec *mem_cgroup_zone_lruvec(struct zone *, struct mem_cgroup *); |
297 | struct lruvec *mem_cgroup_page_lruvec(struct page *, struct zone *); | |
c9b0ed51 | 298 | |
2314b42d | 299 | bool task_in_mem_cgroup(struct task_struct *task, struct mem_cgroup *memcg); |
64219994 | 300 | struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p); |
64219994 | 301 | struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg); |
e993d905 | 302 | |
33398cf2 MH |
303 | static inline |
304 | struct mem_cgroup *mem_cgroup_from_css(struct cgroup_subsys_state *css){ | |
305 | return css ? container_of(css, struct mem_cgroup, css) : NULL; | |
306 | } | |
307 | ||
308 | struct mem_cgroup *mem_cgroup_iter(struct mem_cgroup *, | |
309 | struct mem_cgroup *, | |
310 | struct mem_cgroup_reclaim_cookie *); | |
311 | void mem_cgroup_iter_break(struct mem_cgroup *, struct mem_cgroup *); | |
312 | ||
313 | static inline bool mem_cgroup_is_descendant(struct mem_cgroup *memcg, | |
314 | struct mem_cgroup *root) | |
315 | { | |
316 | if (root == memcg) | |
317 | return true; | |
318 | if (!root->use_hierarchy) | |
319 | return false; | |
320 | return cgroup_is_descendant(memcg->css.cgroup, root->css.cgroup); | |
321 | } | |
e1aab161 | 322 | |
2314b42d JW |
323 | static inline bool mm_match_cgroup(struct mm_struct *mm, |
324 | struct mem_cgroup *memcg) | |
2e4d4091 | 325 | { |
587af308 | 326 | struct mem_cgroup *task_memcg; |
413918bb | 327 | bool match = false; |
c3ac9a8a | 328 | |
2e4d4091 | 329 | rcu_read_lock(); |
587af308 | 330 | task_memcg = mem_cgroup_from_task(rcu_dereference(mm->owner)); |
413918bb | 331 | if (task_memcg) |
2314b42d | 332 | match = mem_cgroup_is_descendant(task_memcg, memcg); |
2e4d4091 | 333 | rcu_read_unlock(); |
c3ac9a8a | 334 | return match; |
2e4d4091 | 335 | } |
8a9f3ccd | 336 | |
64219994 | 337 | struct cgroup_subsys_state *mem_cgroup_css_from_page(struct page *page); |
2fc04524 | 338 | ino_t page_cgroup_ino(struct page *page); |
d324236b | 339 | |
33398cf2 MH |
340 | static inline bool mem_cgroup_disabled(void) |
341 | { | |
fc5ed1e9 | 342 | return !cgroup_subsys_enabled(memory_cgrp_subsys); |
33398cf2 | 343 | } |
5660048c | 344 | |
58ae83db KH |
345 | /* |
346 | * For memory reclaim. | |
347 | */ | |
889976db | 348 | int mem_cgroup_select_victim_node(struct mem_cgroup *memcg); |
33398cf2 MH |
349 | |
350 | void mem_cgroup_update_lru_size(struct lruvec *lruvec, enum lru_list lru, | |
351 | int nr_pages); | |
352 | ||
353 | static inline bool mem_cgroup_lruvec_online(struct lruvec *lruvec) | |
354 | { | |
355 | struct mem_cgroup_per_zone *mz; | |
356 | struct mem_cgroup *memcg; | |
357 | ||
358 | if (mem_cgroup_disabled()) | |
359 | return true; | |
360 | ||
361 | mz = container_of(lruvec, struct mem_cgroup_per_zone, lruvec); | |
362 | memcg = mz->memcg; | |
363 | ||
364 | return !!(memcg->css.flags & CSS_ONLINE); | |
365 | } | |
366 | ||
367 | static inline | |
368 | unsigned long mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list lru) | |
369 | { | |
370 | struct mem_cgroup_per_zone *mz; | |
371 | ||
372 | mz = container_of(lruvec, struct mem_cgroup_per_zone, lruvec); | |
373 | return mz->lru_size[lru]; | |
374 | } | |
375 | ||
13308ca9 | 376 | static inline bool mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec) |
33398cf2 MH |
377 | { |
378 | unsigned long inactive_ratio; | |
379 | unsigned long inactive; | |
380 | unsigned long active; | |
381 | unsigned long gb; | |
382 | ||
383 | inactive = mem_cgroup_get_lru_size(lruvec, LRU_INACTIVE_ANON); | |
384 | active = mem_cgroup_get_lru_size(lruvec, LRU_ACTIVE_ANON); | |
385 | ||
386 | gb = (inactive + active) >> (30 - PAGE_SHIFT); | |
387 | if (gb) | |
388 | inactive_ratio = int_sqrt(10 * gb); | |
389 | else | |
390 | inactive_ratio = 1; | |
391 | ||
392 | return inactive * inactive_ratio < active; | |
393 | } | |
394 | ||
b23afb93 TH |
395 | void mem_cgroup_handle_over_high(void); |
396 | ||
64219994 MH |
397 | void mem_cgroup_print_oom_info(struct mem_cgroup *memcg, |
398 | struct task_struct *p); | |
58ae83db | 399 | |
49426420 | 400 | static inline void mem_cgroup_oom_enable(void) |
519e5247 | 401 | { |
626ebc41 TH |
402 | WARN_ON(current->memcg_may_oom); |
403 | current->memcg_may_oom = 1; | |
519e5247 JW |
404 | } |
405 | ||
49426420 | 406 | static inline void mem_cgroup_oom_disable(void) |
519e5247 | 407 | { |
626ebc41 TH |
408 | WARN_ON(!current->memcg_may_oom); |
409 | current->memcg_may_oom = 0; | |
519e5247 JW |
410 | } |
411 | ||
3812c8c8 JW |
412 | static inline bool task_in_memcg_oom(struct task_struct *p) |
413 | { | |
626ebc41 | 414 | return p->memcg_in_oom; |
3812c8c8 JW |
415 | } |
416 | ||
49426420 | 417 | bool mem_cgroup_oom_synchronize(bool wait); |
3812c8c8 | 418 | |
c255a458 | 419 | #ifdef CONFIG_MEMCG_SWAP |
c077719b KH |
420 | extern int do_swap_account; |
421 | #endif | |
f8d66542 | 422 | |
6de22619 | 423 | struct mem_cgroup *mem_cgroup_begin_page_stat(struct page *page); |
6de22619 | 424 | void mem_cgroup_end_page_stat(struct mem_cgroup *memcg); |
d7365e78 | 425 | |
33398cf2 MH |
426 | /** |
427 | * mem_cgroup_update_page_stat - update page state statistics | |
428 | * @memcg: memcg to account against | |
429 | * @idx: page state item to account | |
430 | * @val: number of pages (positive or negative) | |
431 | * | |
432 | * See mem_cgroup_begin_page_stat() for locking requirements. | |
433 | */ | |
434 | static inline void mem_cgroup_update_page_stat(struct mem_cgroup *memcg, | |
435 | enum mem_cgroup_stat_index idx, int val) | |
436 | { | |
437 | VM_BUG_ON(!rcu_read_lock_held()); | |
438 | ||
439 | if (memcg) | |
440 | this_cpu_add(memcg->stat->count[idx], val); | |
441 | } | |
442 | ||
d7365e78 | 443 | static inline void mem_cgroup_inc_page_stat(struct mem_cgroup *memcg, |
68b4876d | 444 | enum mem_cgroup_stat_index idx) |
2a7106f2 | 445 | { |
d7365e78 | 446 | mem_cgroup_update_page_stat(memcg, idx, 1); |
2a7106f2 GT |
447 | } |
448 | ||
d7365e78 | 449 | static inline void mem_cgroup_dec_page_stat(struct mem_cgroup *memcg, |
68b4876d | 450 | enum mem_cgroup_stat_index idx) |
2a7106f2 | 451 | { |
d7365e78 | 452 | mem_cgroup_update_page_stat(memcg, idx, -1); |
2a7106f2 GT |
453 | } |
454 | ||
0608f43d AM |
455 | unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order, |
456 | gfp_t gfp_mask, | |
457 | unsigned long *total_scanned); | |
a63d83f4 | 458 | |
68ae564b DR |
459 | static inline void mem_cgroup_count_vm_event(struct mm_struct *mm, |
460 | enum vm_event_item idx) | |
461 | { | |
33398cf2 MH |
462 | struct mem_cgroup *memcg; |
463 | ||
68ae564b DR |
464 | if (mem_cgroup_disabled()) |
465 | return; | |
33398cf2 MH |
466 | |
467 | rcu_read_lock(); | |
468 | memcg = mem_cgroup_from_task(rcu_dereference(mm->owner)); | |
469 | if (unlikely(!memcg)) | |
470 | goto out; | |
471 | ||
472 | switch (idx) { | |
473 | case PGFAULT: | |
474 | this_cpu_inc(memcg->stat->events[MEM_CGROUP_EVENTS_PGFAULT]); | |
475 | break; | |
476 | case PGMAJFAULT: | |
477 | this_cpu_inc(memcg->stat->events[MEM_CGROUP_EVENTS_PGMAJFAULT]); | |
478 | break; | |
479 | default: | |
480 | BUG(); | |
481 | } | |
482 | out: | |
483 | rcu_read_unlock(); | |
68ae564b | 484 | } |
ca3e0214 | 485 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
e94c8a9c | 486 | void mem_cgroup_split_huge_fixup(struct page *head); |
ca3e0214 KH |
487 | #endif |
488 | ||
c255a458 | 489 | #else /* CONFIG_MEMCG */ |
7a81b88c KH |
490 | struct mem_cgroup; |
491 | ||
241994ed JW |
492 | static inline void mem_cgroup_events(struct mem_cgroup *memcg, |
493 | enum mem_cgroup_events_index idx, | |
494 | unsigned int nr) | |
495 | { | |
496 | } | |
497 | ||
498 | static inline bool mem_cgroup_low(struct mem_cgroup *root, | |
499 | struct mem_cgroup *memcg) | |
500 | { | |
501 | return false; | |
502 | } | |
503 | ||
00501b53 JW |
504 | static inline int mem_cgroup_try_charge(struct page *page, struct mm_struct *mm, |
505 | gfp_t gfp_mask, | |
506 | struct mem_cgroup **memcgp) | |
7a81b88c | 507 | { |
00501b53 | 508 | *memcgp = NULL; |
7a81b88c KH |
509 | return 0; |
510 | } | |
511 | ||
00501b53 JW |
512 | static inline void mem_cgroup_commit_charge(struct page *page, |
513 | struct mem_cgroup *memcg, | |
514 | bool lrucare) | |
7a81b88c KH |
515 | { |
516 | } | |
517 | ||
00501b53 JW |
518 | static inline void mem_cgroup_cancel_charge(struct page *page, |
519 | struct mem_cgroup *memcg) | |
7a81b88c KH |
520 | { |
521 | } | |
522 | ||
0a31bc97 | 523 | static inline void mem_cgroup_uncharge(struct page *page) |
569b846d KH |
524 | { |
525 | } | |
526 | ||
747db954 | 527 | static inline void mem_cgroup_uncharge_list(struct list_head *page_list) |
8a9f3ccd BS |
528 | { |
529 | } | |
530 | ||
45637bab | 531 | static inline void mem_cgroup_replace_page(struct page *old, struct page *new) |
69029cd5 KH |
532 | { |
533 | } | |
534 | ||
925b7673 JW |
535 | static inline struct lruvec *mem_cgroup_zone_lruvec(struct zone *zone, |
536 | struct mem_cgroup *memcg) | |
08e552c6 | 537 | { |
925b7673 | 538 | return &zone->lruvec; |
08e552c6 KH |
539 | } |
540 | ||
fa9add64 HD |
541 | static inline struct lruvec *mem_cgroup_page_lruvec(struct page *page, |
542 | struct zone *zone) | |
66e1707b | 543 | { |
925b7673 | 544 | return &zone->lruvec; |
66e1707b BS |
545 | } |
546 | ||
587af308 | 547 | static inline bool mm_match_cgroup(struct mm_struct *mm, |
c0ff4b85 | 548 | struct mem_cgroup *memcg) |
bed7161a | 549 | { |
587af308 | 550 | return true; |
bed7161a BS |
551 | } |
552 | ||
ffbdccf5 DR |
553 | static inline bool task_in_mem_cgroup(struct task_struct *task, |
554 | const struct mem_cgroup *memcg) | |
4c4a2214 | 555 | { |
ffbdccf5 | 556 | return true; |
4c4a2214 DR |
557 | } |
558 | ||
5660048c JW |
559 | static inline struct mem_cgroup * |
560 | mem_cgroup_iter(struct mem_cgroup *root, | |
561 | struct mem_cgroup *prev, | |
562 | struct mem_cgroup_reclaim_cookie *reclaim) | |
563 | { | |
564 | return NULL; | |
565 | } | |
566 | ||
567 | static inline void mem_cgroup_iter_break(struct mem_cgroup *root, | |
568 | struct mem_cgroup *prev) | |
569 | { | |
570 | } | |
571 | ||
f8d66542 HT |
572 | static inline bool mem_cgroup_disabled(void) |
573 | { | |
574 | return true; | |
575 | } | |
a636b327 | 576 | |
13308ca9 | 577 | static inline bool |
c56d5c7d | 578 | mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec) |
14797e23 | 579 | { |
13308ca9 | 580 | return true; |
14797e23 KM |
581 | } |
582 | ||
90cbc250 VD |
583 | static inline bool mem_cgroup_lruvec_online(struct lruvec *lruvec) |
584 | { | |
585 | return true; | |
586 | } | |
587 | ||
a3d8e054 | 588 | static inline unsigned long |
4d7dcca2 | 589 | mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list lru) |
a3d8e054 KM |
590 | { |
591 | return 0; | |
592 | } | |
593 | ||
fa9add64 HD |
594 | static inline void |
595 | mem_cgroup_update_lru_size(struct lruvec *lruvec, enum lru_list lru, | |
596 | int increment) | |
3e2f41f1 | 597 | { |
3e2f41f1 KM |
598 | } |
599 | ||
e222432b BS |
600 | static inline void |
601 | mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p) | |
602 | { | |
603 | } | |
604 | ||
6de22619 | 605 | static inline struct mem_cgroup *mem_cgroup_begin_page_stat(struct page *page) |
89c06bd5 | 606 | { |
d7365e78 | 607 | return NULL; |
89c06bd5 KH |
608 | } |
609 | ||
6de22619 | 610 | static inline void mem_cgroup_end_page_stat(struct mem_cgroup *memcg) |
89c06bd5 KH |
611 | { |
612 | } | |
613 | ||
b23afb93 TH |
614 | static inline void mem_cgroup_handle_over_high(void) |
615 | { | |
616 | } | |
617 | ||
49426420 | 618 | static inline void mem_cgroup_oom_enable(void) |
519e5247 JW |
619 | { |
620 | } | |
621 | ||
49426420 | 622 | static inline void mem_cgroup_oom_disable(void) |
519e5247 JW |
623 | { |
624 | } | |
625 | ||
3812c8c8 JW |
626 | static inline bool task_in_memcg_oom(struct task_struct *p) |
627 | { | |
628 | return false; | |
629 | } | |
630 | ||
49426420 | 631 | static inline bool mem_cgroup_oom_synchronize(bool wait) |
3812c8c8 JW |
632 | { |
633 | return false; | |
634 | } | |
635 | ||
d7365e78 | 636 | static inline void mem_cgroup_inc_page_stat(struct mem_cgroup *memcg, |
68b4876d | 637 | enum mem_cgroup_stat_index idx) |
2a7106f2 GT |
638 | { |
639 | } | |
640 | ||
d7365e78 | 641 | static inline void mem_cgroup_dec_page_stat(struct mem_cgroup *memcg, |
68b4876d | 642 | enum mem_cgroup_stat_index idx) |
d69b042f BS |
643 | { |
644 | } | |
645 | ||
4e416953 | 646 | static inline |
0608f43d AM |
647 | unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order, |
648 | gfp_t gfp_mask, | |
649 | unsigned long *total_scanned) | |
4e416953 | 650 | { |
0608f43d | 651 | return 0; |
4e416953 BS |
652 | } |
653 | ||
e94c8a9c | 654 | static inline void mem_cgroup_split_huge_fixup(struct page *head) |
ca3e0214 KH |
655 | { |
656 | } | |
657 | ||
456f998e YH |
658 | static inline |
659 | void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx) | |
660 | { | |
661 | } | |
c255a458 | 662 | #endif /* CONFIG_MEMCG */ |
78fb7466 | 663 | |
e1aab161 GC |
664 | enum { |
665 | UNDER_LIMIT, | |
666 | SOFT_LIMIT, | |
667 | OVER_LIMIT, | |
668 | }; | |
669 | ||
52ebea74 | 670 | #ifdef CONFIG_CGROUP_WRITEBACK |
841710aa | 671 | |
52ebea74 | 672 | struct list_head *mem_cgroup_cgwb_list(struct mem_cgroup *memcg); |
841710aa | 673 | struct wb_domain *mem_cgroup_wb_domain(struct bdi_writeback *wb); |
c5edf9cd TH |
674 | void mem_cgroup_wb_stats(struct bdi_writeback *wb, unsigned long *pfilepages, |
675 | unsigned long *pheadroom, unsigned long *pdirty, | |
676 | unsigned long *pwriteback); | |
841710aa TH |
677 | |
678 | #else /* CONFIG_CGROUP_WRITEBACK */ | |
679 | ||
680 | static inline struct wb_domain *mem_cgroup_wb_domain(struct bdi_writeback *wb) | |
681 | { | |
682 | return NULL; | |
683 | } | |
684 | ||
c2aa723a | 685 | static inline void mem_cgroup_wb_stats(struct bdi_writeback *wb, |
c5edf9cd TH |
686 | unsigned long *pfilepages, |
687 | unsigned long *pheadroom, | |
c2aa723a TH |
688 | unsigned long *pdirty, |
689 | unsigned long *pwriteback) | |
690 | { | |
691 | } | |
692 | ||
841710aa | 693 | #endif /* CONFIG_CGROUP_WRITEBACK */ |
52ebea74 | 694 | |
e1aab161 | 695 | struct sock; |
cd59085a | 696 | #if defined(CONFIG_INET) && defined(CONFIG_MEMCG_KMEM) |
e1aab161 GC |
697 | void sock_update_memcg(struct sock *sk); |
698 | void sock_release_memcg(struct sock *sk); | |
699 | #else | |
700 | static inline void sock_update_memcg(struct sock *sk) | |
701 | { | |
702 | } | |
703 | static inline void sock_release_memcg(struct sock *sk) | |
704 | { | |
705 | } | |
cd59085a | 706 | #endif /* CONFIG_INET && CONFIG_MEMCG_KMEM */ |
7ae1e1d0 GC |
707 | |
708 | #ifdef CONFIG_MEMCG_KMEM | |
a8964b9b | 709 | extern struct static_key memcg_kmem_enabled_key; |
749c5415 | 710 | |
dbcf73e2 | 711 | extern int memcg_nr_cache_ids; |
64219994 MH |
712 | void memcg_get_cache_ids(void); |
713 | void memcg_put_cache_ids(void); | |
ebe945c2 GC |
714 | |
715 | /* | |
716 | * Helper macro to loop through all memcg-specific caches. Callers must still | |
717 | * check if the cache is valid (it is either valid or NULL). | |
718 | * the slab_mutex must be held when looping through those caches | |
719 | */ | |
749c5415 | 720 | #define for_each_memcg_cache_index(_idx) \ |
dbcf73e2 | 721 | for ((_idx) = 0; (_idx) < memcg_nr_cache_ids; (_idx)++) |
749c5415 | 722 | |
7ae1e1d0 GC |
723 | static inline bool memcg_kmem_enabled(void) |
724 | { | |
a8964b9b | 725 | return static_key_false(&memcg_kmem_enabled_key); |
7ae1e1d0 GC |
726 | } |
727 | ||
33398cf2 MH |
728 | static inline bool memcg_kmem_is_active(struct mem_cgroup *memcg) |
729 | { | |
730 | return memcg->kmem_acct_active; | |
731 | } | |
cb731d6c | 732 | |
7ae1e1d0 GC |
733 | /* |
734 | * In general, we'll do everything in our power to not incur in any overhead | |
735 | * for non-memcg users for the kmem functions. Not even a function call, if we | |
736 | * can avoid it. | |
737 | * | |
738 | * Therefore, we'll inline all those functions so that in the best case, we'll | |
739 | * see that kmemcg is off for everybody and proceed quickly. If it is on, | |
740 | * we'll still do most of the flag checking inline. We check a lot of | |
741 | * conditions, but because they are pretty simple, they are expected to be | |
742 | * fast. | |
743 | */ | |
f3ccb2c4 VD |
744 | int __memcg_kmem_charge_memcg(struct page *page, gfp_t gfp, int order, |
745 | struct mem_cgroup *memcg); | |
d05e83a6 VD |
746 | int __memcg_kmem_charge(struct page *page, gfp_t gfp, int order); |
747 | void __memcg_kmem_uncharge(struct page *page, int order); | |
7ae1e1d0 | 748 | |
33398cf2 MH |
749 | /* |
750 | * helper for acessing a memcg's index. It will be used as an index in the | |
751 | * child cache array in kmem_cache, and also to derive its name. This function | |
752 | * will return -1 when this is not a kmem-limited memcg. | |
753 | */ | |
754 | static inline int memcg_cache_id(struct mem_cgroup *memcg) | |
755 | { | |
756 | return memcg ? memcg->kmemcg_id : -1; | |
757 | } | |
5722d094 | 758 | |
230e9fc2 | 759 | struct kmem_cache *__memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp); |
8135be5a | 760 | void __memcg_kmem_put_cache(struct kmem_cache *cachep); |
d7f25f8a | 761 | |
230e9fc2 | 762 | static inline bool __memcg_kmem_bypass(void) |
7ae1e1d0 GC |
763 | { |
764 | if (!memcg_kmem_enabled()) | |
765 | return true; | |
7ae1e1d0 GC |
766 | if (in_interrupt() || (!current->mm) || (current->flags & PF_KTHREAD)) |
767 | return true; | |
cbfb4798 | 768 | return false; |
7ae1e1d0 GC |
769 | } |
770 | ||
771 | /** | |
d05e83a6 VD |
772 | * memcg_kmem_charge: charge a kmem page |
773 | * @page: page to charge | |
774 | * @gfp: reclaim mode | |
775 | * @order: allocation order | |
cbfb4798 | 776 | * |
d05e83a6 | 777 | * Returns 0 on success, an error code on failure. |
7ae1e1d0 | 778 | */ |
d05e83a6 VD |
779 | static __always_inline int memcg_kmem_charge(struct page *page, |
780 | gfp_t gfp, int order) | |
7ae1e1d0 | 781 | { |
230e9fc2 VD |
782 | if (__memcg_kmem_bypass()) |
783 | return 0; | |
784 | if (!(gfp & __GFP_ACCOUNT)) | |
d05e83a6 VD |
785 | return 0; |
786 | return __memcg_kmem_charge(page, gfp, order); | |
7ae1e1d0 GC |
787 | } |
788 | ||
789 | /** | |
d05e83a6 VD |
790 | * memcg_kmem_uncharge: uncharge a kmem page |
791 | * @page: page to uncharge | |
792 | * @order: allocation order | |
7ae1e1d0 | 793 | */ |
d05e83a6 | 794 | static __always_inline void memcg_kmem_uncharge(struct page *page, int order) |
7ae1e1d0 | 795 | { |
7ae1e1d0 | 796 | if (memcg_kmem_enabled()) |
d05e83a6 | 797 | __memcg_kmem_uncharge(page, order); |
7ae1e1d0 GC |
798 | } |
799 | ||
d7f25f8a GC |
800 | /** |
801 | * memcg_kmem_get_cache: selects the correct per-memcg cache for allocation | |
802 | * @cachep: the original global kmem cache | |
d7f25f8a | 803 | * |
5dfb4175 | 804 | * All memory allocated from a per-memcg cache is charged to the owner memcg. |
d7f25f8a GC |
805 | */ |
806 | static __always_inline struct kmem_cache * | |
807 | memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp) | |
808 | { | |
230e9fc2 | 809 | if (__memcg_kmem_bypass()) |
d7f25f8a | 810 | return cachep; |
230e9fc2 | 811 | return __memcg_kmem_get_cache(cachep, gfp); |
d7f25f8a | 812 | } |
8135be5a VD |
813 | |
814 | static __always_inline void memcg_kmem_put_cache(struct kmem_cache *cachep) | |
815 | { | |
816 | if (memcg_kmem_enabled()) | |
817 | __memcg_kmem_put_cache(cachep); | |
818 | } | |
7ae1e1d0 | 819 | #else |
749c5415 GC |
820 | #define for_each_memcg_cache_index(_idx) \ |
821 | for (; NULL; ) | |
822 | ||
b9ce5ef4 GC |
823 | static inline bool memcg_kmem_enabled(void) |
824 | { | |
825 | return false; | |
826 | } | |
827 | ||
cb731d6c VD |
828 | static inline bool memcg_kmem_is_active(struct mem_cgroup *memcg) |
829 | { | |
830 | return false; | |
831 | } | |
832 | ||
d05e83a6 | 833 | static inline int memcg_kmem_charge(struct page *page, gfp_t gfp, int order) |
7ae1e1d0 | 834 | { |
d05e83a6 | 835 | return 0; |
7ae1e1d0 GC |
836 | } |
837 | ||
d05e83a6 | 838 | static inline void memcg_kmem_uncharge(struct page *page, int order) |
7ae1e1d0 GC |
839 | { |
840 | } | |
2633d7a0 GC |
841 | |
842 | static inline int memcg_cache_id(struct mem_cgroup *memcg) | |
843 | { | |
844 | return -1; | |
845 | } | |
846 | ||
05257a1a VD |
847 | static inline void memcg_get_cache_ids(void) |
848 | { | |
849 | } | |
850 | ||
851 | static inline void memcg_put_cache_ids(void) | |
852 | { | |
853 | } | |
854 | ||
d7f25f8a GC |
855 | static inline struct kmem_cache * |
856 | memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp) | |
857 | { | |
858 | return cachep; | |
859 | } | |
8135be5a VD |
860 | |
861 | static inline void memcg_kmem_put_cache(struct kmem_cache *cachep) | |
862 | { | |
863 | } | |
7ae1e1d0 | 864 | #endif /* CONFIG_MEMCG_KMEM */ |
8cdea7c0 | 865 | #endif /* _LINUX_MEMCONTROL_H */ |