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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> | |
fdf1cdb9 | 31 | #include <linux/page-flags.h> |
456f998e | 32 | |
78fb7466 | 33 | struct mem_cgroup; |
8697d331 BS |
34 | struct page; |
35 | struct mm_struct; | |
2633d7a0 | 36 | struct kmem_cache; |
78fb7466 | 37 | |
68b4876d SZ |
38 | /* |
39 | * The corresponding mem_cgroup_stat_names is defined in mm/memcontrol.c, | |
40 | * These two lists should keep in accord with each other. | |
41 | */ | |
42 | enum mem_cgroup_stat_index { | |
43 | /* | |
44 | * For MEM_CONTAINER_TYPE_ALL, usage = pagecache + rss. | |
45 | */ | |
46 | MEM_CGROUP_STAT_CACHE, /* # of pages charged as cache */ | |
47 | MEM_CGROUP_STAT_RSS, /* # of pages charged as anon rss */ | |
48 | MEM_CGROUP_STAT_RSS_HUGE, /* # of pages charged as anon huge */ | |
49 | MEM_CGROUP_STAT_FILE_MAPPED, /* # of pages charged as file rss */ | |
c4843a75 | 50 | MEM_CGROUP_STAT_DIRTY, /* # of dirty pages in page cache */ |
3ea67d06 | 51 | MEM_CGROUP_STAT_WRITEBACK, /* # of pages under writeback */ |
68b4876d SZ |
52 | MEM_CGROUP_STAT_SWAP, /* # of pages, swapped out */ |
53 | MEM_CGROUP_STAT_NSTATS, | |
b2807f07 | 54 | /* default hierarchy stats */ |
12580e4b | 55 | MEMCG_KERNEL_STACK = MEM_CGROUP_STAT_NSTATS, |
27ee57c9 VD |
56 | MEMCG_SLAB_RECLAIMABLE, |
57 | MEMCG_SLAB_UNRECLAIMABLE, | |
12580e4b | 58 | MEMCG_SOCK, |
b2807f07 | 59 | MEMCG_NR_STAT, |
2a7106f2 GT |
60 | }; |
61 | ||
5660048c JW |
62 | struct mem_cgroup_reclaim_cookie { |
63 | struct zone *zone; | |
64 | int priority; | |
65 | unsigned int generation; | |
66 | }; | |
67 | ||
241994ed JW |
68 | enum mem_cgroup_events_index { |
69 | MEM_CGROUP_EVENTS_PGPGIN, /* # of pages paged in */ | |
70 | MEM_CGROUP_EVENTS_PGPGOUT, /* # of pages paged out */ | |
71 | MEM_CGROUP_EVENTS_PGFAULT, /* # of page-faults */ | |
72 | MEM_CGROUP_EVENTS_PGMAJFAULT, /* # of major page-faults */ | |
73 | MEM_CGROUP_EVENTS_NSTATS, | |
74 | /* default hierarchy events */ | |
75 | MEMCG_LOW = MEM_CGROUP_EVENTS_NSTATS, | |
76 | MEMCG_HIGH, | |
77 | MEMCG_MAX, | |
78 | MEMCG_OOM, | |
79 | MEMCG_NR_EVENTS, | |
80 | }; | |
81 | ||
33398cf2 MH |
82 | /* |
83 | * Per memcg event counter is incremented at every pagein/pageout. With THP, | |
84 | * it will be incremated by the number of pages. This counter is used for | |
85 | * for trigger some periodic events. This is straightforward and better | |
86 | * than using jiffies etc. to handle periodic memcg event. | |
87 | */ | |
88 | enum mem_cgroup_events_target { | |
89 | MEM_CGROUP_TARGET_THRESH, | |
90 | MEM_CGROUP_TARGET_SOFTLIMIT, | |
91 | MEM_CGROUP_TARGET_NUMAINFO, | |
92 | MEM_CGROUP_NTARGETS, | |
93 | }; | |
94 | ||
c255a458 | 95 | #ifdef CONFIG_MEMCG |
23047a96 JW |
96 | |
97 | #define MEM_CGROUP_ID_SHIFT 16 | |
98 | #define MEM_CGROUP_ID_MAX USHRT_MAX | |
99 | ||
33398cf2 | 100 | struct mem_cgroup_stat_cpu { |
b2807f07 | 101 | long count[MEMCG_NR_STAT]; |
33398cf2 MH |
102 | unsigned long events[MEMCG_NR_EVENTS]; |
103 | unsigned long nr_page_events; | |
104 | unsigned long targets[MEM_CGROUP_NTARGETS]; | |
105 | }; | |
106 | ||
107 | struct mem_cgroup_reclaim_iter { | |
108 | struct mem_cgroup *position; | |
109 | /* scan generation, increased every round-trip */ | |
110 | unsigned int generation; | |
111 | }; | |
112 | ||
113 | /* | |
114 | * per-zone information in memory controller. | |
115 | */ | |
116 | struct mem_cgroup_per_zone { | |
117 | struct lruvec lruvec; | |
118 | unsigned long lru_size[NR_LRU_LISTS]; | |
119 | ||
120 | struct mem_cgroup_reclaim_iter iter[DEF_PRIORITY + 1]; | |
121 | ||
122 | struct rb_node tree_node; /* RB tree node */ | |
123 | unsigned long usage_in_excess;/* Set to the value by which */ | |
124 | /* the soft limit is exceeded*/ | |
125 | bool on_tree; | |
126 | struct mem_cgroup *memcg; /* Back pointer, we cannot */ | |
127 | /* use container_of */ | |
128 | }; | |
129 | ||
130 | struct mem_cgroup_per_node { | |
131 | struct mem_cgroup_per_zone zoneinfo[MAX_NR_ZONES]; | |
132 | }; | |
133 | ||
134 | struct mem_cgroup_threshold { | |
135 | struct eventfd_ctx *eventfd; | |
136 | unsigned long threshold; | |
137 | }; | |
138 | ||
139 | /* For threshold */ | |
140 | struct mem_cgroup_threshold_ary { | |
141 | /* An array index points to threshold just below or equal to usage. */ | |
142 | int current_threshold; | |
143 | /* Size of entries[] */ | |
144 | unsigned int size; | |
145 | /* Array of thresholds */ | |
146 | struct mem_cgroup_threshold entries[0]; | |
147 | }; | |
148 | ||
149 | struct mem_cgroup_thresholds { | |
150 | /* Primary thresholds array */ | |
151 | struct mem_cgroup_threshold_ary *primary; | |
152 | /* | |
153 | * Spare threshold array. | |
154 | * This is needed to make mem_cgroup_unregister_event() "never fail". | |
155 | * It must be able to store at least primary->size - 1 entries. | |
156 | */ | |
157 | struct mem_cgroup_threshold_ary *spare; | |
158 | }; | |
159 | ||
567e9ab2 JW |
160 | enum memcg_kmem_state { |
161 | KMEM_NONE, | |
162 | KMEM_ALLOCATED, | |
163 | KMEM_ONLINE, | |
164 | }; | |
165 | ||
33398cf2 MH |
166 | /* |
167 | * The memory controller data structure. The memory controller controls both | |
168 | * page cache and RSS per cgroup. We would eventually like to provide | |
169 | * statistics based on the statistics developed by Rik Van Riel for clock-pro, | |
170 | * to help the administrator determine what knobs to tune. | |
171 | */ | |
172 | struct mem_cgroup { | |
173 | struct cgroup_subsys_state css; | |
174 | ||
175 | /* Accounted resources */ | |
176 | struct page_counter memory; | |
37e84351 | 177 | struct page_counter swap; |
0db15298 JW |
178 | |
179 | /* Legacy consumer-oriented counters */ | |
33398cf2 MH |
180 | struct page_counter memsw; |
181 | struct page_counter kmem; | |
0db15298 | 182 | struct page_counter tcpmem; |
33398cf2 MH |
183 | |
184 | /* Normal memory consumption range */ | |
185 | unsigned long low; | |
186 | unsigned long high; | |
187 | ||
f7e1cb6e JW |
188 | /* Range enforcement for interrupt charges */ |
189 | struct work_struct high_work; | |
190 | ||
33398cf2 MH |
191 | unsigned long soft_limit; |
192 | ||
193 | /* vmpressure notifications */ | |
194 | struct vmpressure vmpressure; | |
195 | ||
33398cf2 MH |
196 | /* |
197 | * Should the accounting and control be hierarchical, per subtree? | |
198 | */ | |
199 | bool use_hierarchy; | |
200 | ||
201 | /* protected by memcg_oom_lock */ | |
202 | bool oom_lock; | |
203 | int under_oom; | |
204 | ||
205 | int swappiness; | |
206 | /* OOM-Killer disable */ | |
207 | int oom_kill_disable; | |
208 | ||
472912a2 TH |
209 | /* handle for "memory.events" */ |
210 | struct cgroup_file events_file; | |
211 | ||
33398cf2 MH |
212 | /* protect arrays of thresholds */ |
213 | struct mutex thresholds_lock; | |
214 | ||
215 | /* thresholds for memory usage. RCU-protected */ | |
216 | struct mem_cgroup_thresholds thresholds; | |
217 | ||
218 | /* thresholds for mem+swap usage. RCU-protected */ | |
219 | struct mem_cgroup_thresholds memsw_thresholds; | |
220 | ||
221 | /* For oom notifier event fd */ | |
222 | struct list_head oom_notify; | |
223 | ||
224 | /* | |
225 | * Should we move charges of a task when a task is moved into this | |
226 | * mem_cgroup ? And what type of charges should we move ? | |
227 | */ | |
228 | unsigned long move_charge_at_immigrate; | |
229 | /* | |
230 | * set > 0 if pages under this cgroup are moving to other cgroup. | |
231 | */ | |
232 | atomic_t moving_account; | |
233 | /* taken only while moving_account > 0 */ | |
234 | spinlock_t move_lock; | |
235 | struct task_struct *move_lock_task; | |
236 | unsigned long move_lock_flags; | |
237 | /* | |
238 | * percpu counter. | |
239 | */ | |
240 | struct mem_cgroup_stat_cpu __percpu *stat; | |
33398cf2 | 241 | |
d886f4e4 JW |
242 | unsigned long socket_pressure; |
243 | ||
244 | /* Legacy tcp memory accounting */ | |
0db15298 JW |
245 | bool tcpmem_active; |
246 | int tcpmem_pressure; | |
d886f4e4 | 247 | |
127424c8 | 248 | #ifndef CONFIG_SLOB |
33398cf2 MH |
249 | /* Index in the kmem_cache->memcg_params.memcg_caches array */ |
250 | int kmemcg_id; | |
567e9ab2 | 251 | enum memcg_kmem_state kmem_state; |
33398cf2 MH |
252 | #endif |
253 | ||
254 | int last_scanned_node; | |
255 | #if MAX_NUMNODES > 1 | |
256 | nodemask_t scan_nodes; | |
257 | atomic_t numainfo_events; | |
258 | atomic_t numainfo_updating; | |
259 | #endif | |
260 | ||
261 | #ifdef CONFIG_CGROUP_WRITEBACK | |
262 | struct list_head cgwb_list; | |
263 | struct wb_domain cgwb_domain; | |
264 | #endif | |
265 | ||
266 | /* List of events which userspace want to receive */ | |
267 | struct list_head event_list; | |
268 | spinlock_t event_list_lock; | |
269 | ||
270 | struct mem_cgroup_per_node *nodeinfo[0]; | |
271 | /* WARNING: nodeinfo must be the last member here */ | |
272 | }; | |
7d828602 JW |
273 | |
274 | extern struct mem_cgroup *root_mem_cgroup; | |
56161634 | 275 | |
23047a96 JW |
276 | static inline bool mem_cgroup_disabled(void) |
277 | { | |
278 | return !cgroup_subsys_enabled(memory_cgrp_subsys); | |
279 | } | |
280 | ||
33398cf2 MH |
281 | /** |
282 | * mem_cgroup_events - count memory events against a cgroup | |
283 | * @memcg: the memory cgroup | |
284 | * @idx: the event index | |
285 | * @nr: the number of events to account for | |
286 | */ | |
287 | static inline void mem_cgroup_events(struct mem_cgroup *memcg, | |
241994ed | 288 | enum mem_cgroup_events_index idx, |
33398cf2 MH |
289 | unsigned int nr) |
290 | { | |
291 | this_cpu_add(memcg->stat->events[idx], nr); | |
472912a2 | 292 | cgroup_file_notify(&memcg->events_file); |
33398cf2 | 293 | } |
241994ed JW |
294 | |
295 | bool mem_cgroup_low(struct mem_cgroup *root, struct mem_cgroup *memcg); | |
296 | ||
00501b53 | 297 | int mem_cgroup_try_charge(struct page *page, struct mm_struct *mm, |
f627c2f5 KS |
298 | gfp_t gfp_mask, struct mem_cgroup **memcgp, |
299 | bool compound); | |
00501b53 | 300 | void mem_cgroup_commit_charge(struct page *page, struct mem_cgroup *memcg, |
f627c2f5 KS |
301 | bool lrucare, bool compound); |
302 | void mem_cgroup_cancel_charge(struct page *page, struct mem_cgroup *memcg, | |
303 | bool compound); | |
0a31bc97 | 304 | void mem_cgroup_uncharge(struct page *page); |
747db954 | 305 | void mem_cgroup_uncharge_list(struct list_head *page_list); |
569b846d | 306 | |
6a93ca8f | 307 | void mem_cgroup_migrate(struct page *oldpage, struct page *newpage); |
569b846d | 308 | |
0a31bc97 JW |
309 | struct lruvec *mem_cgroup_zone_lruvec(struct zone *, struct mem_cgroup *); |
310 | struct lruvec *mem_cgroup_page_lruvec(struct page *, struct zone *); | |
c9b0ed51 | 311 | |
2314b42d | 312 | bool task_in_mem_cgroup(struct task_struct *task, struct mem_cgroup *memcg); |
64219994 | 313 | struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p); |
e993d905 | 314 | |
33398cf2 MH |
315 | static inline |
316 | struct mem_cgroup *mem_cgroup_from_css(struct cgroup_subsys_state *css){ | |
317 | return css ? container_of(css, struct mem_cgroup, css) : NULL; | |
318 | } | |
319 | ||
8e8ae645 JW |
320 | #define mem_cgroup_from_counter(counter, member) \ |
321 | container_of(counter, struct mem_cgroup, member) | |
322 | ||
33398cf2 MH |
323 | struct mem_cgroup *mem_cgroup_iter(struct mem_cgroup *, |
324 | struct mem_cgroup *, | |
325 | struct mem_cgroup_reclaim_cookie *); | |
326 | void mem_cgroup_iter_break(struct mem_cgroup *, struct mem_cgroup *); | |
327 | ||
23047a96 JW |
328 | static inline unsigned short mem_cgroup_id(struct mem_cgroup *memcg) |
329 | { | |
330 | if (mem_cgroup_disabled()) | |
331 | return 0; | |
332 | ||
333 | return memcg->css.id; | |
334 | } | |
335 | ||
336 | /** | |
337 | * mem_cgroup_from_id - look up a memcg from an id | |
338 | * @id: the id to look up | |
339 | * | |
340 | * Caller must hold rcu_read_lock() and use css_tryget() as necessary. | |
341 | */ | |
342 | static inline struct mem_cgroup *mem_cgroup_from_id(unsigned short id) | |
343 | { | |
344 | struct cgroup_subsys_state *css; | |
345 | ||
346 | css = css_from_id(id, &memory_cgrp_subsys); | |
347 | return mem_cgroup_from_css(css); | |
348 | } | |
349 | ||
8e8ae645 JW |
350 | /** |
351 | * parent_mem_cgroup - find the accounting parent of a memcg | |
352 | * @memcg: memcg whose parent to find | |
353 | * | |
354 | * Returns the parent memcg, or NULL if this is the root or the memory | |
355 | * controller is in legacy no-hierarchy mode. | |
356 | */ | |
357 | static inline struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg) | |
358 | { | |
359 | if (!memcg->memory.parent) | |
360 | return NULL; | |
361 | return mem_cgroup_from_counter(memcg->memory.parent, memory); | |
362 | } | |
363 | ||
33398cf2 MH |
364 | static inline bool mem_cgroup_is_descendant(struct mem_cgroup *memcg, |
365 | struct mem_cgroup *root) | |
366 | { | |
367 | if (root == memcg) | |
368 | return true; | |
369 | if (!root->use_hierarchy) | |
370 | return false; | |
371 | return cgroup_is_descendant(memcg->css.cgroup, root->css.cgroup); | |
372 | } | |
e1aab161 | 373 | |
2314b42d JW |
374 | static inline bool mm_match_cgroup(struct mm_struct *mm, |
375 | struct mem_cgroup *memcg) | |
2e4d4091 | 376 | { |
587af308 | 377 | struct mem_cgroup *task_memcg; |
413918bb | 378 | bool match = false; |
c3ac9a8a | 379 | |
2e4d4091 | 380 | rcu_read_lock(); |
587af308 | 381 | task_memcg = mem_cgroup_from_task(rcu_dereference(mm->owner)); |
413918bb | 382 | if (task_memcg) |
2314b42d | 383 | match = mem_cgroup_is_descendant(task_memcg, memcg); |
2e4d4091 | 384 | rcu_read_unlock(); |
c3ac9a8a | 385 | return match; |
2e4d4091 | 386 | } |
8a9f3ccd | 387 | |
64219994 | 388 | struct cgroup_subsys_state *mem_cgroup_css_from_page(struct page *page); |
2fc04524 | 389 | ino_t page_cgroup_ino(struct page *page); |
d324236b | 390 | |
eb01aaab VD |
391 | static inline bool mem_cgroup_online(struct mem_cgroup *memcg) |
392 | { | |
393 | if (mem_cgroup_disabled()) | |
394 | return true; | |
395 | return !!(memcg->css.flags & CSS_ONLINE); | |
396 | } | |
397 | ||
58ae83db KH |
398 | /* |
399 | * For memory reclaim. | |
400 | */ | |
889976db | 401 | int mem_cgroup_select_victim_node(struct mem_cgroup *memcg); |
33398cf2 MH |
402 | |
403 | void mem_cgroup_update_lru_size(struct lruvec *lruvec, enum lru_list lru, | |
404 | int nr_pages); | |
405 | ||
0a6b76dd VD |
406 | unsigned long mem_cgroup_node_nr_lru_pages(struct mem_cgroup *memcg, |
407 | int nid, unsigned int lru_mask); | |
408 | ||
33398cf2 MH |
409 | static inline |
410 | unsigned long mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list lru) | |
411 | { | |
412 | struct mem_cgroup_per_zone *mz; | |
413 | ||
414 | mz = container_of(lruvec, struct mem_cgroup_per_zone, lruvec); | |
415 | return mz->lru_size[lru]; | |
416 | } | |
417 | ||
b23afb93 TH |
418 | void mem_cgroup_handle_over_high(void); |
419 | ||
64219994 MH |
420 | void mem_cgroup_print_oom_info(struct mem_cgroup *memcg, |
421 | struct task_struct *p); | |
58ae83db | 422 | |
49426420 | 423 | static inline void mem_cgroup_oom_enable(void) |
519e5247 | 424 | { |
626ebc41 TH |
425 | WARN_ON(current->memcg_may_oom); |
426 | current->memcg_may_oom = 1; | |
519e5247 JW |
427 | } |
428 | ||
49426420 | 429 | static inline void mem_cgroup_oom_disable(void) |
519e5247 | 430 | { |
626ebc41 TH |
431 | WARN_ON(!current->memcg_may_oom); |
432 | current->memcg_may_oom = 0; | |
519e5247 JW |
433 | } |
434 | ||
3812c8c8 JW |
435 | static inline bool task_in_memcg_oom(struct task_struct *p) |
436 | { | |
626ebc41 | 437 | return p->memcg_in_oom; |
3812c8c8 JW |
438 | } |
439 | ||
49426420 | 440 | bool mem_cgroup_oom_synchronize(bool wait); |
3812c8c8 | 441 | |
c255a458 | 442 | #ifdef CONFIG_MEMCG_SWAP |
c077719b KH |
443 | extern int do_swap_account; |
444 | #endif | |
f8d66542 | 445 | |
62cccb8c JW |
446 | void lock_page_memcg(struct page *page); |
447 | void unlock_page_memcg(struct page *page); | |
d7365e78 | 448 | |
33398cf2 MH |
449 | /** |
450 | * mem_cgroup_update_page_stat - update page state statistics | |
62cccb8c | 451 | * @page: the page |
33398cf2 MH |
452 | * @idx: page state item to account |
453 | * @val: number of pages (positive or negative) | |
454 | * | |
fdf1cdb9 JW |
455 | * The @page must be locked or the caller must use lock_page_memcg() |
456 | * to prevent double accounting when the page is concurrently being | |
457 | * moved to another memcg: | |
81f8c3a4 | 458 | * |
fdf1cdb9 | 459 | * lock_page(page) or lock_page_memcg(page) |
81f8c3a4 | 460 | * if (TestClearPageState(page)) |
62cccb8c | 461 | * mem_cgroup_update_page_stat(page, state, -1); |
fdf1cdb9 | 462 | * unlock_page(page) or unlock_page_memcg(page) |
33398cf2 | 463 | */ |
62cccb8c | 464 | static inline void mem_cgroup_update_page_stat(struct page *page, |
33398cf2 MH |
465 | enum mem_cgroup_stat_index idx, int val) |
466 | { | |
fdf1cdb9 | 467 | VM_BUG_ON(!(rcu_read_lock_held() || PageLocked(page))); |
33398cf2 | 468 | |
62cccb8c JW |
469 | if (page->mem_cgroup) |
470 | this_cpu_add(page->mem_cgroup->stat->count[idx], val); | |
33398cf2 MH |
471 | } |
472 | ||
62cccb8c | 473 | static inline void mem_cgroup_inc_page_stat(struct page *page, |
68b4876d | 474 | enum mem_cgroup_stat_index idx) |
2a7106f2 | 475 | { |
62cccb8c | 476 | mem_cgroup_update_page_stat(page, idx, 1); |
2a7106f2 GT |
477 | } |
478 | ||
62cccb8c | 479 | static inline void mem_cgroup_dec_page_stat(struct page *page, |
68b4876d | 480 | enum mem_cgroup_stat_index idx) |
2a7106f2 | 481 | { |
62cccb8c | 482 | mem_cgroup_update_page_stat(page, idx, -1); |
2a7106f2 GT |
483 | } |
484 | ||
0608f43d AM |
485 | unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order, |
486 | gfp_t gfp_mask, | |
487 | unsigned long *total_scanned); | |
a63d83f4 | 488 | |
68ae564b DR |
489 | static inline void mem_cgroup_count_vm_event(struct mm_struct *mm, |
490 | enum vm_event_item idx) | |
491 | { | |
33398cf2 MH |
492 | struct mem_cgroup *memcg; |
493 | ||
68ae564b DR |
494 | if (mem_cgroup_disabled()) |
495 | return; | |
33398cf2 MH |
496 | |
497 | rcu_read_lock(); | |
498 | memcg = mem_cgroup_from_task(rcu_dereference(mm->owner)); | |
499 | if (unlikely(!memcg)) | |
500 | goto out; | |
501 | ||
502 | switch (idx) { | |
503 | case PGFAULT: | |
504 | this_cpu_inc(memcg->stat->events[MEM_CGROUP_EVENTS_PGFAULT]); | |
505 | break; | |
506 | case PGMAJFAULT: | |
507 | this_cpu_inc(memcg->stat->events[MEM_CGROUP_EVENTS_PGMAJFAULT]); | |
508 | break; | |
509 | default: | |
510 | BUG(); | |
511 | } | |
512 | out: | |
513 | rcu_read_unlock(); | |
68ae564b | 514 | } |
ca3e0214 | 515 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
e94c8a9c | 516 | void mem_cgroup_split_huge_fixup(struct page *head); |
ca3e0214 KH |
517 | #endif |
518 | ||
c255a458 | 519 | #else /* CONFIG_MEMCG */ |
23047a96 JW |
520 | |
521 | #define MEM_CGROUP_ID_SHIFT 0 | |
522 | #define MEM_CGROUP_ID_MAX 0 | |
523 | ||
7a81b88c KH |
524 | struct mem_cgroup; |
525 | ||
23047a96 JW |
526 | static inline bool mem_cgroup_disabled(void) |
527 | { | |
528 | return true; | |
529 | } | |
530 | ||
241994ed JW |
531 | static inline void mem_cgroup_events(struct mem_cgroup *memcg, |
532 | enum mem_cgroup_events_index idx, | |
533 | unsigned int nr) | |
534 | { | |
535 | } | |
536 | ||
537 | static inline bool mem_cgroup_low(struct mem_cgroup *root, | |
538 | struct mem_cgroup *memcg) | |
539 | { | |
540 | return false; | |
541 | } | |
542 | ||
00501b53 JW |
543 | static inline int mem_cgroup_try_charge(struct page *page, struct mm_struct *mm, |
544 | gfp_t gfp_mask, | |
f627c2f5 KS |
545 | struct mem_cgroup **memcgp, |
546 | bool compound) | |
7a81b88c | 547 | { |
00501b53 | 548 | *memcgp = NULL; |
7a81b88c KH |
549 | return 0; |
550 | } | |
551 | ||
00501b53 JW |
552 | static inline void mem_cgroup_commit_charge(struct page *page, |
553 | struct mem_cgroup *memcg, | |
f627c2f5 | 554 | bool lrucare, bool compound) |
7a81b88c KH |
555 | { |
556 | } | |
557 | ||
00501b53 | 558 | static inline void mem_cgroup_cancel_charge(struct page *page, |
f627c2f5 KS |
559 | struct mem_cgroup *memcg, |
560 | bool compound) | |
7a81b88c KH |
561 | { |
562 | } | |
563 | ||
0a31bc97 | 564 | static inline void mem_cgroup_uncharge(struct page *page) |
569b846d KH |
565 | { |
566 | } | |
567 | ||
747db954 | 568 | static inline void mem_cgroup_uncharge_list(struct list_head *page_list) |
8a9f3ccd BS |
569 | { |
570 | } | |
571 | ||
6a93ca8f | 572 | static inline void mem_cgroup_migrate(struct page *old, struct page *new) |
69029cd5 KH |
573 | { |
574 | } | |
575 | ||
925b7673 JW |
576 | static inline struct lruvec *mem_cgroup_zone_lruvec(struct zone *zone, |
577 | struct mem_cgroup *memcg) | |
08e552c6 | 578 | { |
925b7673 | 579 | return &zone->lruvec; |
08e552c6 KH |
580 | } |
581 | ||
fa9add64 HD |
582 | static inline struct lruvec *mem_cgroup_page_lruvec(struct page *page, |
583 | struct zone *zone) | |
66e1707b | 584 | { |
925b7673 | 585 | return &zone->lruvec; |
66e1707b BS |
586 | } |
587 | ||
587af308 | 588 | static inline bool mm_match_cgroup(struct mm_struct *mm, |
c0ff4b85 | 589 | struct mem_cgroup *memcg) |
bed7161a | 590 | { |
587af308 | 591 | return true; |
bed7161a BS |
592 | } |
593 | ||
ffbdccf5 DR |
594 | static inline bool task_in_mem_cgroup(struct task_struct *task, |
595 | const struct mem_cgroup *memcg) | |
4c4a2214 | 596 | { |
ffbdccf5 | 597 | return true; |
4c4a2214 DR |
598 | } |
599 | ||
5660048c JW |
600 | static inline struct mem_cgroup * |
601 | mem_cgroup_iter(struct mem_cgroup *root, | |
602 | struct mem_cgroup *prev, | |
603 | struct mem_cgroup_reclaim_cookie *reclaim) | |
604 | { | |
605 | return NULL; | |
606 | } | |
607 | ||
608 | static inline void mem_cgroup_iter_break(struct mem_cgroup *root, | |
609 | struct mem_cgroup *prev) | |
610 | { | |
611 | } | |
612 | ||
23047a96 | 613 | static inline unsigned short mem_cgroup_id(struct mem_cgroup *memcg) |
f8d66542 | 614 | { |
23047a96 JW |
615 | return 0; |
616 | } | |
617 | ||
618 | static inline struct mem_cgroup *mem_cgroup_from_id(unsigned short id) | |
619 | { | |
620 | WARN_ON_ONCE(id); | |
621 | /* XXX: This should always return root_mem_cgroup */ | |
622 | return NULL; | |
f8d66542 | 623 | } |
a636b327 | 624 | |
eb01aaab | 625 | static inline bool mem_cgroup_online(struct mem_cgroup *memcg) |
14797e23 | 626 | { |
13308ca9 | 627 | return true; |
14797e23 KM |
628 | } |
629 | ||
a3d8e054 | 630 | static inline unsigned long |
4d7dcca2 | 631 | mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list lru) |
a3d8e054 KM |
632 | { |
633 | return 0; | |
634 | } | |
635 | ||
0a6b76dd VD |
636 | static inline unsigned long |
637 | mem_cgroup_node_nr_lru_pages(struct mem_cgroup *memcg, | |
638 | int nid, unsigned int lru_mask) | |
639 | { | |
640 | return 0; | |
641 | } | |
642 | ||
e222432b BS |
643 | static inline void |
644 | mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p) | |
645 | { | |
646 | } | |
647 | ||
62cccb8c | 648 | static inline void lock_page_memcg(struct page *page) |
89c06bd5 KH |
649 | { |
650 | } | |
651 | ||
62cccb8c | 652 | static inline void unlock_page_memcg(struct page *page) |
89c06bd5 KH |
653 | { |
654 | } | |
655 | ||
b23afb93 TH |
656 | static inline void mem_cgroup_handle_over_high(void) |
657 | { | |
658 | } | |
659 | ||
49426420 | 660 | static inline void mem_cgroup_oom_enable(void) |
519e5247 JW |
661 | { |
662 | } | |
663 | ||
49426420 | 664 | static inline void mem_cgroup_oom_disable(void) |
519e5247 JW |
665 | { |
666 | } | |
667 | ||
3812c8c8 JW |
668 | static inline bool task_in_memcg_oom(struct task_struct *p) |
669 | { | |
670 | return false; | |
671 | } | |
672 | ||
49426420 | 673 | static inline bool mem_cgroup_oom_synchronize(bool wait) |
3812c8c8 JW |
674 | { |
675 | return false; | |
676 | } | |
677 | ||
62cccb8c | 678 | static inline void mem_cgroup_inc_page_stat(struct page *page, |
68b4876d | 679 | enum mem_cgroup_stat_index idx) |
2a7106f2 GT |
680 | { |
681 | } | |
682 | ||
62cccb8c | 683 | static inline void mem_cgroup_dec_page_stat(struct page *page, |
68b4876d | 684 | enum mem_cgroup_stat_index idx) |
d69b042f BS |
685 | { |
686 | } | |
687 | ||
4e416953 | 688 | static inline |
0608f43d AM |
689 | unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order, |
690 | gfp_t gfp_mask, | |
691 | unsigned long *total_scanned) | |
4e416953 | 692 | { |
0608f43d | 693 | return 0; |
4e416953 BS |
694 | } |
695 | ||
e94c8a9c | 696 | static inline void mem_cgroup_split_huge_fixup(struct page *head) |
ca3e0214 KH |
697 | { |
698 | } | |
699 | ||
456f998e YH |
700 | static inline |
701 | void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx) | |
702 | { | |
703 | } | |
c255a458 | 704 | #endif /* CONFIG_MEMCG */ |
78fb7466 | 705 | |
52ebea74 | 706 | #ifdef CONFIG_CGROUP_WRITEBACK |
841710aa | 707 | |
52ebea74 | 708 | struct list_head *mem_cgroup_cgwb_list(struct mem_cgroup *memcg); |
841710aa | 709 | struct wb_domain *mem_cgroup_wb_domain(struct bdi_writeback *wb); |
c5edf9cd TH |
710 | void mem_cgroup_wb_stats(struct bdi_writeback *wb, unsigned long *pfilepages, |
711 | unsigned long *pheadroom, unsigned long *pdirty, | |
712 | unsigned long *pwriteback); | |
841710aa TH |
713 | |
714 | #else /* CONFIG_CGROUP_WRITEBACK */ | |
715 | ||
716 | static inline struct wb_domain *mem_cgroup_wb_domain(struct bdi_writeback *wb) | |
717 | { | |
718 | return NULL; | |
719 | } | |
720 | ||
c2aa723a | 721 | static inline void mem_cgroup_wb_stats(struct bdi_writeback *wb, |
c5edf9cd TH |
722 | unsigned long *pfilepages, |
723 | unsigned long *pheadroom, | |
c2aa723a TH |
724 | unsigned long *pdirty, |
725 | unsigned long *pwriteback) | |
726 | { | |
727 | } | |
728 | ||
841710aa | 729 | #endif /* CONFIG_CGROUP_WRITEBACK */ |
52ebea74 | 730 | |
e1aab161 | 731 | struct sock; |
e1aab161 GC |
732 | void sock_update_memcg(struct sock *sk); |
733 | void sock_release_memcg(struct sock *sk); | |
baac50bb JW |
734 | bool mem_cgroup_charge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages); |
735 | void mem_cgroup_uncharge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages); | |
d886f4e4 | 736 | #ifdef CONFIG_MEMCG |
ef12947c JW |
737 | extern struct static_key_false memcg_sockets_enabled_key; |
738 | #define mem_cgroup_sockets_enabled static_branch_unlikely(&memcg_sockets_enabled_key) | |
baac50bb | 739 | static inline bool mem_cgroup_under_socket_pressure(struct mem_cgroup *memcg) |
e805605c | 740 | { |
0db15298 | 741 | if (!cgroup_subsys_on_dfl(memory_cgrp_subsys) && memcg->tcpmem_pressure) |
8e8ae645 | 742 | return true; |
8e8ae645 JW |
743 | do { |
744 | if (time_before(jiffies, memcg->socket_pressure)) | |
745 | return true; | |
746 | } while ((memcg = parent_mem_cgroup(memcg))); | |
747 | return false; | |
e805605c JW |
748 | } |
749 | #else | |
80e95fe0 | 750 | #define mem_cgroup_sockets_enabled 0 |
baac50bb | 751 | static inline bool mem_cgroup_under_socket_pressure(struct mem_cgroup *memcg) |
e805605c JW |
752 | { |
753 | return false; | |
754 | } | |
755 | #endif | |
7ae1e1d0 | 756 | |
127424c8 | 757 | #if defined(CONFIG_MEMCG) && !defined(CONFIG_SLOB) |
ef12947c | 758 | extern struct static_key_false memcg_kmem_enabled_key; |
749c5415 | 759 | |
dbcf73e2 | 760 | extern int memcg_nr_cache_ids; |
64219994 MH |
761 | void memcg_get_cache_ids(void); |
762 | void memcg_put_cache_ids(void); | |
ebe945c2 GC |
763 | |
764 | /* | |
765 | * Helper macro to loop through all memcg-specific caches. Callers must still | |
766 | * check if the cache is valid (it is either valid or NULL). | |
767 | * the slab_mutex must be held when looping through those caches | |
768 | */ | |
749c5415 | 769 | #define for_each_memcg_cache_index(_idx) \ |
dbcf73e2 | 770 | for ((_idx) = 0; (_idx) < memcg_nr_cache_ids; (_idx)++) |
749c5415 | 771 | |
7ae1e1d0 GC |
772 | static inline bool memcg_kmem_enabled(void) |
773 | { | |
ef12947c | 774 | return static_branch_unlikely(&memcg_kmem_enabled_key); |
7ae1e1d0 GC |
775 | } |
776 | ||
777 | /* | |
778 | * In general, we'll do everything in our power to not incur in any overhead | |
779 | * for non-memcg users for the kmem functions. Not even a function call, if we | |
780 | * can avoid it. | |
781 | * | |
782 | * Therefore, we'll inline all those functions so that in the best case, we'll | |
783 | * see that kmemcg is off for everybody and proceed quickly. If it is on, | |
784 | * we'll still do most of the flag checking inline. We check a lot of | |
785 | * conditions, but because they are pretty simple, they are expected to be | |
786 | * fast. | |
787 | */ | |
f3ccb2c4 VD |
788 | int __memcg_kmem_charge_memcg(struct page *page, gfp_t gfp, int order, |
789 | struct mem_cgroup *memcg); | |
d05e83a6 VD |
790 | int __memcg_kmem_charge(struct page *page, gfp_t gfp, int order); |
791 | void __memcg_kmem_uncharge(struct page *page, int order); | |
7ae1e1d0 | 792 | |
33398cf2 | 793 | /* |
9f706d68 | 794 | * helper for accessing a memcg's index. It will be used as an index in the |
33398cf2 MH |
795 | * child cache array in kmem_cache, and also to derive its name. This function |
796 | * will return -1 when this is not a kmem-limited memcg. | |
797 | */ | |
798 | static inline int memcg_cache_id(struct mem_cgroup *memcg) | |
799 | { | |
800 | return memcg ? memcg->kmemcg_id : -1; | |
801 | } | |
5722d094 | 802 | |
230e9fc2 | 803 | struct kmem_cache *__memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp); |
8135be5a | 804 | void __memcg_kmem_put_cache(struct kmem_cache *cachep); |
d7f25f8a | 805 | |
230e9fc2 | 806 | static inline bool __memcg_kmem_bypass(void) |
7ae1e1d0 GC |
807 | { |
808 | if (!memcg_kmem_enabled()) | |
809 | return true; | |
7ae1e1d0 GC |
810 | if (in_interrupt() || (!current->mm) || (current->flags & PF_KTHREAD)) |
811 | return true; | |
cbfb4798 | 812 | return false; |
7ae1e1d0 GC |
813 | } |
814 | ||
815 | /** | |
d05e83a6 VD |
816 | * memcg_kmem_charge: charge a kmem page |
817 | * @page: page to charge | |
818 | * @gfp: reclaim mode | |
819 | * @order: allocation order | |
cbfb4798 | 820 | * |
d05e83a6 | 821 | * Returns 0 on success, an error code on failure. |
7ae1e1d0 | 822 | */ |
d05e83a6 VD |
823 | static __always_inline int memcg_kmem_charge(struct page *page, |
824 | gfp_t gfp, int order) | |
7ae1e1d0 | 825 | { |
230e9fc2 VD |
826 | if (__memcg_kmem_bypass()) |
827 | return 0; | |
828 | if (!(gfp & __GFP_ACCOUNT)) | |
d05e83a6 VD |
829 | return 0; |
830 | return __memcg_kmem_charge(page, gfp, order); | |
7ae1e1d0 GC |
831 | } |
832 | ||
833 | /** | |
d05e83a6 VD |
834 | * memcg_kmem_uncharge: uncharge a kmem page |
835 | * @page: page to uncharge | |
836 | * @order: allocation order | |
7ae1e1d0 | 837 | */ |
d05e83a6 | 838 | static __always_inline void memcg_kmem_uncharge(struct page *page, int order) |
7ae1e1d0 | 839 | { |
7ae1e1d0 | 840 | if (memcg_kmem_enabled()) |
d05e83a6 | 841 | __memcg_kmem_uncharge(page, order); |
7ae1e1d0 GC |
842 | } |
843 | ||
d7f25f8a GC |
844 | /** |
845 | * memcg_kmem_get_cache: selects the correct per-memcg cache for allocation | |
846 | * @cachep: the original global kmem cache | |
d7f25f8a | 847 | * |
5dfb4175 | 848 | * All memory allocated from a per-memcg cache is charged to the owner memcg. |
d7f25f8a GC |
849 | */ |
850 | static __always_inline struct kmem_cache * | |
851 | memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp) | |
852 | { | |
230e9fc2 | 853 | if (__memcg_kmem_bypass()) |
d7f25f8a | 854 | return cachep; |
230e9fc2 | 855 | return __memcg_kmem_get_cache(cachep, gfp); |
d7f25f8a | 856 | } |
8135be5a VD |
857 | |
858 | static __always_inline void memcg_kmem_put_cache(struct kmem_cache *cachep) | |
859 | { | |
860 | if (memcg_kmem_enabled()) | |
861 | __memcg_kmem_put_cache(cachep); | |
862 | } | |
27ee57c9 VD |
863 | |
864 | /** | |
865 | * memcg_kmem_update_page_stat - update kmem page state statistics | |
866 | * @page: the page | |
867 | * @idx: page state item to account | |
868 | * @val: number of pages (positive or negative) | |
869 | */ | |
870 | static inline void memcg_kmem_update_page_stat(struct page *page, | |
871 | enum mem_cgroup_stat_index idx, int val) | |
872 | { | |
873 | if (memcg_kmem_enabled() && page->mem_cgroup) | |
874 | this_cpu_add(page->mem_cgroup->stat->count[idx], val); | |
875 | } | |
876 | ||
7ae1e1d0 | 877 | #else |
749c5415 GC |
878 | #define for_each_memcg_cache_index(_idx) \ |
879 | for (; NULL; ) | |
880 | ||
b9ce5ef4 GC |
881 | static inline bool memcg_kmem_enabled(void) |
882 | { | |
883 | return false; | |
884 | } | |
885 | ||
d05e83a6 | 886 | static inline int memcg_kmem_charge(struct page *page, gfp_t gfp, int order) |
7ae1e1d0 | 887 | { |
d05e83a6 | 888 | return 0; |
7ae1e1d0 GC |
889 | } |
890 | ||
d05e83a6 | 891 | static inline void memcg_kmem_uncharge(struct page *page, int order) |
7ae1e1d0 GC |
892 | { |
893 | } | |
2633d7a0 GC |
894 | |
895 | static inline int memcg_cache_id(struct mem_cgroup *memcg) | |
896 | { | |
897 | return -1; | |
898 | } | |
899 | ||
05257a1a VD |
900 | static inline void memcg_get_cache_ids(void) |
901 | { | |
902 | } | |
903 | ||
904 | static inline void memcg_put_cache_ids(void) | |
905 | { | |
906 | } | |
907 | ||
d7f25f8a GC |
908 | static inline struct kmem_cache * |
909 | memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp) | |
910 | { | |
911 | return cachep; | |
912 | } | |
8135be5a VD |
913 | |
914 | static inline void memcg_kmem_put_cache(struct kmem_cache *cachep) | |
915 | { | |
916 | } | |
27ee57c9 VD |
917 | |
918 | static inline void memcg_kmem_update_page_stat(struct page *page, | |
919 | enum mem_cgroup_stat_index idx, int val) | |
920 | { | |
921 | } | |
127424c8 JW |
922 | #endif /* CONFIG_MEMCG && !CONFIG_SLOB */ |
923 | ||
8cdea7c0 | 924 | #endif /* _LINUX_MEMCONTROL_H */ |