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1 | /* memcontrol.h - Memory Controller | |
2 | * | |
3 | * Copyright IBM Corporation, 2007 | |
4 | * Author Balbir Singh <balbir@linux.vnet.ibm.com> | |
5 | * | |
6 | * Copyright 2007 OpenVZ SWsoft Inc | |
7 | * Author: Pavel Emelianov <xemul@openvz.org> | |
8 | * | |
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 | |
22 | #include <linux/cgroup.h> | |
23 | #include <linux/vm_event_item.h> | |
24 | #include <linux/hardirq.h> | |
25 | #include <linux/jump_label.h> | |
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> | |
31 | #include <linux/page-flags.h> | |
32 | ||
33 | struct mem_cgroup; | |
34 | struct page; | |
35 | struct mm_struct; | |
36 | struct kmem_cache; | |
37 | ||
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 */ | |
50 | MEM_CGROUP_STAT_DIRTY, /* # of dirty pages in page cache */ | |
51 | MEM_CGROUP_STAT_WRITEBACK, /* # of pages under writeback */ | |
52 | MEM_CGROUP_STAT_SWAP, /* # of pages, swapped out */ | |
53 | MEM_CGROUP_STAT_NSTATS, | |
54 | /* default hierarchy stats */ | |
55 | MEMCG_KERNEL_STACK = MEM_CGROUP_STAT_NSTATS, | |
56 | MEMCG_SLAB_RECLAIMABLE, | |
57 | MEMCG_SLAB_UNRECLAIMABLE, | |
58 | MEMCG_SOCK, | |
59 | MEMCG_NR_STAT, | |
60 | }; | |
61 | ||
62 | struct mem_cgroup_reclaim_cookie { | |
63 | struct zone *zone; | |
64 | int priority; | |
65 | unsigned int generation; | |
66 | }; | |
67 | ||
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 | ||
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 | ||
95 | #ifdef CONFIG_MEMCG | |
96 | ||
97 | #define MEM_CGROUP_ID_SHIFT 16 | |
98 | #define MEM_CGROUP_ID_MAX USHRT_MAX | |
99 | ||
100 | struct mem_cgroup_id { | |
101 | int id; | |
102 | atomic_t ref; | |
103 | }; | |
104 | ||
105 | struct mem_cgroup_stat_cpu { | |
106 | long count[MEMCG_NR_STAT]; | |
107 | unsigned long events[MEMCG_NR_EVENTS]; | |
108 | unsigned long nr_page_events; | |
109 | unsigned long targets[MEM_CGROUP_NTARGETS]; | |
110 | }; | |
111 | ||
112 | struct mem_cgroup_reclaim_iter { | |
113 | struct mem_cgroup *position; | |
114 | /* scan generation, increased every round-trip */ | |
115 | unsigned int generation; | |
116 | }; | |
117 | ||
118 | /* | |
119 | * per-zone information in memory controller. | |
120 | */ | |
121 | struct mem_cgroup_per_zone { | |
122 | struct lruvec lruvec; | |
123 | unsigned long lru_size[NR_LRU_LISTS]; | |
124 | ||
125 | struct mem_cgroup_reclaim_iter iter[DEF_PRIORITY + 1]; | |
126 | ||
127 | struct rb_node tree_node; /* RB tree node */ | |
128 | unsigned long usage_in_excess;/* Set to the value by which */ | |
129 | /* the soft limit is exceeded*/ | |
130 | bool on_tree; | |
131 | struct mem_cgroup *memcg; /* Back pointer, we cannot */ | |
132 | /* use container_of */ | |
133 | }; | |
134 | ||
135 | struct mem_cgroup_per_node { | |
136 | struct mem_cgroup_per_zone zoneinfo[MAX_NR_ZONES]; | |
137 | }; | |
138 | ||
139 | struct mem_cgroup_threshold { | |
140 | struct eventfd_ctx *eventfd; | |
141 | unsigned long threshold; | |
142 | }; | |
143 | ||
144 | /* For threshold */ | |
145 | struct mem_cgroup_threshold_ary { | |
146 | /* An array index points to threshold just below or equal to usage. */ | |
147 | int current_threshold; | |
148 | /* Size of entries[] */ | |
149 | unsigned int size; | |
150 | /* Array of thresholds */ | |
151 | struct mem_cgroup_threshold entries[0]; | |
152 | }; | |
153 | ||
154 | struct mem_cgroup_thresholds { | |
155 | /* Primary thresholds array */ | |
156 | struct mem_cgroup_threshold_ary *primary; | |
157 | /* | |
158 | * Spare threshold array. | |
159 | * This is needed to make mem_cgroup_unregister_event() "never fail". | |
160 | * It must be able to store at least primary->size - 1 entries. | |
161 | */ | |
162 | struct mem_cgroup_threshold_ary *spare; | |
163 | }; | |
164 | ||
165 | enum memcg_kmem_state { | |
166 | KMEM_NONE, | |
167 | KMEM_ALLOCATED, | |
168 | KMEM_ONLINE, | |
169 | }; | |
170 | ||
171 | /* | |
172 | * The memory controller data structure. The memory controller controls both | |
173 | * page cache and RSS per cgroup. We would eventually like to provide | |
174 | * statistics based on the statistics developed by Rik Van Riel for clock-pro, | |
175 | * to help the administrator determine what knobs to tune. | |
176 | */ | |
177 | struct mem_cgroup { | |
178 | struct cgroup_subsys_state css; | |
179 | ||
180 | /* Private memcg ID. Used to ID objects that outlive the cgroup */ | |
181 | struct mem_cgroup_id id; | |
182 | ||
183 | /* Accounted resources */ | |
184 | struct page_counter memory; | |
185 | struct page_counter swap; | |
186 | ||
187 | /* Legacy consumer-oriented counters */ | |
188 | struct page_counter memsw; | |
189 | struct page_counter kmem; | |
190 | struct page_counter tcpmem; | |
191 | ||
192 | /* Normal memory consumption range */ | |
193 | unsigned long low; | |
194 | unsigned long high; | |
195 | ||
196 | /* Range enforcement for interrupt charges */ | |
197 | struct work_struct high_work; | |
198 | ||
199 | unsigned long soft_limit; | |
200 | ||
201 | /* vmpressure notifications */ | |
202 | struct vmpressure vmpressure; | |
203 | ||
204 | /* | |
205 | * Should the accounting and control be hierarchical, per subtree? | |
206 | */ | |
207 | bool use_hierarchy; | |
208 | ||
209 | /* protected by memcg_oom_lock */ | |
210 | bool oom_lock; | |
211 | int under_oom; | |
212 | ||
213 | int swappiness; | |
214 | /* OOM-Killer disable */ | |
215 | int oom_kill_disable; | |
216 | ||
217 | /* handle for "memory.events" */ | |
218 | struct cgroup_file events_file; | |
219 | ||
220 | /* protect arrays of thresholds */ | |
221 | struct mutex thresholds_lock; | |
222 | ||
223 | /* thresholds for memory usage. RCU-protected */ | |
224 | struct mem_cgroup_thresholds thresholds; | |
225 | ||
226 | /* thresholds for mem+swap usage. RCU-protected */ | |
227 | struct mem_cgroup_thresholds memsw_thresholds; | |
228 | ||
229 | /* For oom notifier event fd */ | |
230 | struct list_head oom_notify; | |
231 | ||
232 | /* | |
233 | * Should we move charges of a task when a task is moved into this | |
234 | * mem_cgroup ? And what type of charges should we move ? | |
235 | */ | |
236 | unsigned long move_charge_at_immigrate; | |
237 | /* | |
238 | * set > 0 if pages under this cgroup are moving to other cgroup. | |
239 | */ | |
240 | atomic_t moving_account; | |
241 | /* taken only while moving_account > 0 */ | |
242 | spinlock_t move_lock; | |
243 | struct task_struct *move_lock_task; | |
244 | unsigned long move_lock_flags; | |
245 | /* | |
246 | * percpu counter. | |
247 | */ | |
248 | struct mem_cgroup_stat_cpu __percpu *stat; | |
249 | ||
250 | unsigned long socket_pressure; | |
251 | ||
252 | /* Legacy tcp memory accounting */ | |
253 | bool tcpmem_active; | |
254 | int tcpmem_pressure; | |
255 | ||
256 | #ifndef CONFIG_SLOB | |
257 | /* Index in the kmem_cache->memcg_params.memcg_caches array */ | |
258 | int kmemcg_id; | |
259 | enum memcg_kmem_state kmem_state; | |
260 | #endif | |
261 | ||
262 | int last_scanned_node; | |
263 | #if MAX_NUMNODES > 1 | |
264 | nodemask_t scan_nodes; | |
265 | atomic_t numainfo_events; | |
266 | atomic_t numainfo_updating; | |
267 | #endif | |
268 | ||
269 | #ifdef CONFIG_CGROUP_WRITEBACK | |
270 | struct list_head cgwb_list; | |
271 | struct wb_domain cgwb_domain; | |
272 | #endif | |
273 | ||
274 | /* List of events which userspace want to receive */ | |
275 | struct list_head event_list; | |
276 | spinlock_t event_list_lock; | |
277 | ||
278 | struct mem_cgroup_per_node *nodeinfo[0]; | |
279 | /* WARNING: nodeinfo must be the last member here */ | |
280 | }; | |
281 | ||
282 | extern struct mem_cgroup *root_mem_cgroup; | |
283 | ||
284 | static inline bool mem_cgroup_disabled(void) | |
285 | { | |
286 | return !cgroup_subsys_enabled(memory_cgrp_subsys); | |
287 | } | |
288 | ||
289 | /** | |
290 | * mem_cgroup_events - count memory events against a cgroup | |
291 | * @memcg: the memory cgroup | |
292 | * @idx: the event index | |
293 | * @nr: the number of events to account for | |
294 | */ | |
295 | static inline void mem_cgroup_events(struct mem_cgroup *memcg, | |
296 | enum mem_cgroup_events_index idx, | |
297 | unsigned int nr) | |
298 | { | |
299 | this_cpu_add(memcg->stat->events[idx], nr); | |
300 | cgroup_file_notify(&memcg->events_file); | |
301 | } | |
302 | ||
303 | bool mem_cgroup_low(struct mem_cgroup *root, struct mem_cgroup *memcg); | |
304 | ||
305 | int mem_cgroup_try_charge(struct page *page, struct mm_struct *mm, | |
306 | gfp_t gfp_mask, struct mem_cgroup **memcgp, | |
307 | bool compound); | |
308 | void mem_cgroup_commit_charge(struct page *page, struct mem_cgroup *memcg, | |
309 | bool lrucare, bool compound); | |
310 | void mem_cgroup_cancel_charge(struct page *page, struct mem_cgroup *memcg, | |
311 | bool compound); | |
312 | void mem_cgroup_uncharge(struct page *page); | |
313 | void mem_cgroup_uncharge_list(struct list_head *page_list); | |
314 | ||
315 | void mem_cgroup_migrate(struct page *oldpage, struct page *newpage); | |
316 | ||
317 | struct lruvec *mem_cgroup_zone_lruvec(struct zone *, struct mem_cgroup *); | |
318 | struct lruvec *mem_cgroup_page_lruvec(struct page *, struct zone *); | |
319 | ||
320 | bool task_in_mem_cgroup(struct task_struct *task, struct mem_cgroup *memcg); | |
321 | struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p); | |
322 | ||
323 | static inline | |
324 | struct mem_cgroup *mem_cgroup_from_css(struct cgroup_subsys_state *css){ | |
325 | return css ? container_of(css, struct mem_cgroup, css) : NULL; | |
326 | } | |
327 | ||
328 | #define mem_cgroup_from_counter(counter, member) \ | |
329 | container_of(counter, struct mem_cgroup, member) | |
330 | ||
331 | struct mem_cgroup *mem_cgroup_iter(struct mem_cgroup *, | |
332 | struct mem_cgroup *, | |
333 | struct mem_cgroup_reclaim_cookie *); | |
334 | void mem_cgroup_iter_break(struct mem_cgroup *, struct mem_cgroup *); | |
335 | ||
336 | static inline unsigned short mem_cgroup_id(struct mem_cgroup *memcg) | |
337 | { | |
338 | if (mem_cgroup_disabled()) | |
339 | return 0; | |
340 | ||
341 | return memcg->id.id; | |
342 | } | |
343 | struct mem_cgroup *mem_cgroup_from_id(unsigned short id); | |
344 | ||
345 | /** | |
346 | * parent_mem_cgroup - find the accounting parent of a memcg | |
347 | * @memcg: memcg whose parent to find | |
348 | * | |
349 | * Returns the parent memcg, or NULL if this is the root or the memory | |
350 | * controller is in legacy no-hierarchy mode. | |
351 | */ | |
352 | static inline struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg) | |
353 | { | |
354 | if (!memcg->memory.parent) | |
355 | return NULL; | |
356 | return mem_cgroup_from_counter(memcg->memory.parent, memory); | |
357 | } | |
358 | ||
359 | static inline bool mem_cgroup_is_descendant(struct mem_cgroup *memcg, | |
360 | struct mem_cgroup *root) | |
361 | { | |
362 | if (root == memcg) | |
363 | return true; | |
364 | if (!root->use_hierarchy) | |
365 | return false; | |
366 | return cgroup_is_descendant(memcg->css.cgroup, root->css.cgroup); | |
367 | } | |
368 | ||
369 | static inline bool mm_match_cgroup(struct mm_struct *mm, | |
370 | struct mem_cgroup *memcg) | |
371 | { | |
372 | struct mem_cgroup *task_memcg; | |
373 | bool match = false; | |
374 | ||
375 | rcu_read_lock(); | |
376 | task_memcg = mem_cgroup_from_task(rcu_dereference(mm->owner)); | |
377 | if (task_memcg) | |
378 | match = mem_cgroup_is_descendant(task_memcg, memcg); | |
379 | rcu_read_unlock(); | |
380 | return match; | |
381 | } | |
382 | ||
383 | struct cgroup_subsys_state *mem_cgroup_css_from_page(struct page *page); | |
384 | ino_t page_cgroup_ino(struct page *page); | |
385 | ||
386 | static inline bool mem_cgroup_online(struct mem_cgroup *memcg) | |
387 | { | |
388 | if (mem_cgroup_disabled()) | |
389 | return true; | |
390 | return !!(memcg->css.flags & CSS_ONLINE); | |
391 | } | |
392 | ||
393 | /* | |
394 | * For memory reclaim. | |
395 | */ | |
396 | int mem_cgroup_select_victim_node(struct mem_cgroup *memcg); | |
397 | ||
398 | void mem_cgroup_update_lru_size(struct lruvec *lruvec, enum lru_list lru, | |
399 | int nr_pages); | |
400 | ||
401 | unsigned long mem_cgroup_node_nr_lru_pages(struct mem_cgroup *memcg, | |
402 | int nid, unsigned int lru_mask); | |
403 | ||
404 | static inline | |
405 | unsigned long mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list lru) | |
406 | { | |
407 | struct mem_cgroup_per_zone *mz; | |
408 | ||
409 | mz = container_of(lruvec, struct mem_cgroup_per_zone, lruvec); | |
410 | return mz->lru_size[lru]; | |
411 | } | |
412 | ||
413 | void mem_cgroup_handle_over_high(void); | |
414 | ||
415 | void mem_cgroup_print_oom_info(struct mem_cgroup *memcg, | |
416 | struct task_struct *p); | |
417 | ||
418 | static inline void mem_cgroup_oom_enable(void) | |
419 | { | |
420 | WARN_ON(current->memcg_may_oom); | |
421 | current->memcg_may_oom = 1; | |
422 | } | |
423 | ||
424 | static inline void mem_cgroup_oom_disable(void) | |
425 | { | |
426 | WARN_ON(!current->memcg_may_oom); | |
427 | current->memcg_may_oom = 0; | |
428 | } | |
429 | ||
430 | static inline bool task_in_memcg_oom(struct task_struct *p) | |
431 | { | |
432 | return p->memcg_in_oom; | |
433 | } | |
434 | ||
435 | bool mem_cgroup_oom_synchronize(bool wait); | |
436 | ||
437 | #ifdef CONFIG_MEMCG_SWAP | |
438 | extern int do_swap_account; | |
439 | #endif | |
440 | ||
441 | void lock_page_memcg(struct page *page); | |
442 | void unlock_page_memcg(struct page *page); | |
443 | ||
444 | /** | |
445 | * mem_cgroup_update_page_stat - update page state statistics | |
446 | * @page: the page | |
447 | * @idx: page state item to account | |
448 | * @val: number of pages (positive or negative) | |
449 | * | |
450 | * The @page must be locked or the caller must use lock_page_memcg() | |
451 | * to prevent double accounting when the page is concurrently being | |
452 | * moved to another memcg: | |
453 | * | |
454 | * lock_page(page) or lock_page_memcg(page) | |
455 | * if (TestClearPageState(page)) | |
456 | * mem_cgroup_update_page_stat(page, state, -1); | |
457 | * unlock_page(page) or unlock_page_memcg(page) | |
458 | */ | |
459 | static inline void mem_cgroup_update_page_stat(struct page *page, | |
460 | enum mem_cgroup_stat_index idx, int val) | |
461 | { | |
462 | VM_BUG_ON(!(rcu_read_lock_held() || PageLocked(page))); | |
463 | ||
464 | if (page->mem_cgroup) | |
465 | this_cpu_add(page->mem_cgroup->stat->count[idx], val); | |
466 | } | |
467 | ||
468 | static inline void mem_cgroup_inc_page_stat(struct page *page, | |
469 | enum mem_cgroup_stat_index idx) | |
470 | { | |
471 | mem_cgroup_update_page_stat(page, idx, 1); | |
472 | } | |
473 | ||
474 | static inline void mem_cgroup_dec_page_stat(struct page *page, | |
475 | enum mem_cgroup_stat_index idx) | |
476 | { | |
477 | mem_cgroup_update_page_stat(page, idx, -1); | |
478 | } | |
479 | ||
480 | unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order, | |
481 | gfp_t gfp_mask, | |
482 | unsigned long *total_scanned); | |
483 | ||
484 | static inline void mem_cgroup_count_vm_event(struct mm_struct *mm, | |
485 | enum vm_event_item idx) | |
486 | { | |
487 | struct mem_cgroup *memcg; | |
488 | ||
489 | if (mem_cgroup_disabled()) | |
490 | return; | |
491 | ||
492 | rcu_read_lock(); | |
493 | memcg = mem_cgroup_from_task(rcu_dereference(mm->owner)); | |
494 | if (unlikely(!memcg)) | |
495 | goto out; | |
496 | ||
497 | switch (idx) { | |
498 | case PGFAULT: | |
499 | this_cpu_inc(memcg->stat->events[MEM_CGROUP_EVENTS_PGFAULT]); | |
500 | break; | |
501 | case PGMAJFAULT: | |
502 | this_cpu_inc(memcg->stat->events[MEM_CGROUP_EVENTS_PGMAJFAULT]); | |
503 | break; | |
504 | default: | |
505 | BUG(); | |
506 | } | |
507 | out: | |
508 | rcu_read_unlock(); | |
509 | } | |
510 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
511 | void mem_cgroup_split_huge_fixup(struct page *head); | |
512 | #endif | |
513 | ||
514 | #else /* CONFIG_MEMCG */ | |
515 | ||
516 | #define MEM_CGROUP_ID_SHIFT 0 | |
517 | #define MEM_CGROUP_ID_MAX 0 | |
518 | ||
519 | struct mem_cgroup; | |
520 | ||
521 | static inline bool mem_cgroup_disabled(void) | |
522 | { | |
523 | return true; | |
524 | } | |
525 | ||
526 | static inline void mem_cgroup_events(struct mem_cgroup *memcg, | |
527 | enum mem_cgroup_events_index idx, | |
528 | unsigned int nr) | |
529 | { | |
530 | } | |
531 | ||
532 | static inline bool mem_cgroup_low(struct mem_cgroup *root, | |
533 | struct mem_cgroup *memcg) | |
534 | { | |
535 | return false; | |
536 | } | |
537 | ||
538 | static inline int mem_cgroup_try_charge(struct page *page, struct mm_struct *mm, | |
539 | gfp_t gfp_mask, | |
540 | struct mem_cgroup **memcgp, | |
541 | bool compound) | |
542 | { | |
543 | *memcgp = NULL; | |
544 | return 0; | |
545 | } | |
546 | ||
547 | static inline void mem_cgroup_commit_charge(struct page *page, | |
548 | struct mem_cgroup *memcg, | |
549 | bool lrucare, bool compound) | |
550 | { | |
551 | } | |
552 | ||
553 | static inline void mem_cgroup_cancel_charge(struct page *page, | |
554 | struct mem_cgroup *memcg, | |
555 | bool compound) | |
556 | { | |
557 | } | |
558 | ||
559 | static inline void mem_cgroup_uncharge(struct page *page) | |
560 | { | |
561 | } | |
562 | ||
563 | static inline void mem_cgroup_uncharge_list(struct list_head *page_list) | |
564 | { | |
565 | } | |
566 | ||
567 | static inline void mem_cgroup_migrate(struct page *old, struct page *new) | |
568 | { | |
569 | } | |
570 | ||
571 | static inline struct lruvec *mem_cgroup_zone_lruvec(struct zone *zone, | |
572 | struct mem_cgroup *memcg) | |
573 | { | |
574 | return &zone->lruvec; | |
575 | } | |
576 | ||
577 | static inline struct lruvec *mem_cgroup_page_lruvec(struct page *page, | |
578 | struct zone *zone) | |
579 | { | |
580 | return &zone->lruvec; | |
581 | } | |
582 | ||
583 | static inline bool mm_match_cgroup(struct mm_struct *mm, | |
584 | struct mem_cgroup *memcg) | |
585 | { | |
586 | return true; | |
587 | } | |
588 | ||
589 | static inline bool task_in_mem_cgroup(struct task_struct *task, | |
590 | const struct mem_cgroup *memcg) | |
591 | { | |
592 | return true; | |
593 | } | |
594 | ||
595 | static inline struct mem_cgroup * | |
596 | mem_cgroup_iter(struct mem_cgroup *root, | |
597 | struct mem_cgroup *prev, | |
598 | struct mem_cgroup_reclaim_cookie *reclaim) | |
599 | { | |
600 | return NULL; | |
601 | } | |
602 | ||
603 | static inline void mem_cgroup_iter_break(struct mem_cgroup *root, | |
604 | struct mem_cgroup *prev) | |
605 | { | |
606 | } | |
607 | ||
608 | static inline unsigned short mem_cgroup_id(struct mem_cgroup *memcg) | |
609 | { | |
610 | return 0; | |
611 | } | |
612 | ||
613 | static inline struct mem_cgroup *mem_cgroup_from_id(unsigned short id) | |
614 | { | |
615 | WARN_ON_ONCE(id); | |
616 | /* XXX: This should always return root_mem_cgroup */ | |
617 | return NULL; | |
618 | } | |
619 | ||
620 | static inline bool mem_cgroup_online(struct mem_cgroup *memcg) | |
621 | { | |
622 | return true; | |
623 | } | |
624 | ||
625 | static inline unsigned long | |
626 | mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list lru) | |
627 | { | |
628 | return 0; | |
629 | } | |
630 | ||
631 | static inline unsigned long | |
632 | mem_cgroup_node_nr_lru_pages(struct mem_cgroup *memcg, | |
633 | int nid, unsigned int lru_mask) | |
634 | { | |
635 | return 0; | |
636 | } | |
637 | ||
638 | static inline void | |
639 | mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p) | |
640 | { | |
641 | } | |
642 | ||
643 | static inline void lock_page_memcg(struct page *page) | |
644 | { | |
645 | } | |
646 | ||
647 | static inline void unlock_page_memcg(struct page *page) | |
648 | { | |
649 | } | |
650 | ||
651 | static inline void mem_cgroup_handle_over_high(void) | |
652 | { | |
653 | } | |
654 | ||
655 | static inline void mem_cgroup_oom_enable(void) | |
656 | { | |
657 | } | |
658 | ||
659 | static inline void mem_cgroup_oom_disable(void) | |
660 | { | |
661 | } | |
662 | ||
663 | static inline bool task_in_memcg_oom(struct task_struct *p) | |
664 | { | |
665 | return false; | |
666 | } | |
667 | ||
668 | static inline bool mem_cgroup_oom_synchronize(bool wait) | |
669 | { | |
670 | return false; | |
671 | } | |
672 | ||
673 | static inline void mem_cgroup_inc_page_stat(struct page *page, | |
674 | enum mem_cgroup_stat_index idx) | |
675 | { | |
676 | } | |
677 | ||
678 | static inline void mem_cgroup_dec_page_stat(struct page *page, | |
679 | enum mem_cgroup_stat_index idx) | |
680 | { | |
681 | } | |
682 | ||
683 | static inline | |
684 | unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order, | |
685 | gfp_t gfp_mask, | |
686 | unsigned long *total_scanned) | |
687 | { | |
688 | return 0; | |
689 | } | |
690 | ||
691 | static inline void mem_cgroup_split_huge_fixup(struct page *head) | |
692 | { | |
693 | } | |
694 | ||
695 | static inline | |
696 | void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx) | |
697 | { | |
698 | } | |
699 | #endif /* CONFIG_MEMCG */ | |
700 | ||
701 | #ifdef CONFIG_CGROUP_WRITEBACK | |
702 | ||
703 | struct list_head *mem_cgroup_cgwb_list(struct mem_cgroup *memcg); | |
704 | struct wb_domain *mem_cgroup_wb_domain(struct bdi_writeback *wb); | |
705 | void mem_cgroup_wb_stats(struct bdi_writeback *wb, unsigned long *pfilepages, | |
706 | unsigned long *pheadroom, unsigned long *pdirty, | |
707 | unsigned long *pwriteback); | |
708 | ||
709 | #else /* CONFIG_CGROUP_WRITEBACK */ | |
710 | ||
711 | static inline struct wb_domain *mem_cgroup_wb_domain(struct bdi_writeback *wb) | |
712 | { | |
713 | return NULL; | |
714 | } | |
715 | ||
716 | static inline void mem_cgroup_wb_stats(struct bdi_writeback *wb, | |
717 | unsigned long *pfilepages, | |
718 | unsigned long *pheadroom, | |
719 | unsigned long *pdirty, | |
720 | unsigned long *pwriteback) | |
721 | { | |
722 | } | |
723 | ||
724 | #endif /* CONFIG_CGROUP_WRITEBACK */ | |
725 | ||
726 | struct sock; | |
727 | void sock_update_memcg(struct sock *sk); | |
728 | void sock_release_memcg(struct sock *sk); | |
729 | bool mem_cgroup_charge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages); | |
730 | void mem_cgroup_uncharge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages); | |
731 | #ifdef CONFIG_MEMCG | |
732 | extern struct static_key_false memcg_sockets_enabled_key; | |
733 | #define mem_cgroup_sockets_enabled static_branch_unlikely(&memcg_sockets_enabled_key) | |
734 | static inline bool mem_cgroup_under_socket_pressure(struct mem_cgroup *memcg) | |
735 | { | |
736 | if (!cgroup_subsys_on_dfl(memory_cgrp_subsys) && memcg->tcpmem_pressure) | |
737 | return true; | |
738 | do { | |
739 | if (time_before(jiffies, memcg->socket_pressure)) | |
740 | return true; | |
741 | } while ((memcg = parent_mem_cgroup(memcg))); | |
742 | return false; | |
743 | } | |
744 | #else | |
745 | #define mem_cgroup_sockets_enabled 0 | |
746 | static inline bool mem_cgroup_under_socket_pressure(struct mem_cgroup *memcg) | |
747 | { | |
748 | return false; | |
749 | } | |
750 | #endif | |
751 | ||
752 | struct kmem_cache *memcg_kmem_get_cache(struct kmem_cache *cachep); | |
753 | void memcg_kmem_put_cache(struct kmem_cache *cachep); | |
754 | int memcg_kmem_charge_memcg(struct page *page, gfp_t gfp, int order, | |
755 | struct mem_cgroup *memcg); | |
756 | int memcg_kmem_charge(struct page *page, gfp_t gfp, int order); | |
757 | void memcg_kmem_uncharge(struct page *page, int order); | |
758 | ||
759 | #if defined(CONFIG_MEMCG) && !defined(CONFIG_SLOB) | |
760 | extern struct static_key_false memcg_kmem_enabled_key; | |
761 | ||
762 | extern int memcg_nr_cache_ids; | |
763 | void memcg_get_cache_ids(void); | |
764 | void memcg_put_cache_ids(void); | |
765 | ||
766 | /* | |
767 | * Helper macro to loop through all memcg-specific caches. Callers must still | |
768 | * check if the cache is valid (it is either valid or NULL). | |
769 | * the slab_mutex must be held when looping through those caches | |
770 | */ | |
771 | #define for_each_memcg_cache_index(_idx) \ | |
772 | for ((_idx) = 0; (_idx) < memcg_nr_cache_ids; (_idx)++) | |
773 | ||
774 | static inline bool memcg_kmem_enabled(void) | |
775 | { | |
776 | return static_branch_unlikely(&memcg_kmem_enabled_key); | |
777 | } | |
778 | ||
779 | /* | |
780 | * helper for accessing a memcg's index. It will be used as an index in the | |
781 | * child cache array in kmem_cache, and also to derive its name. This function | |
782 | * will return -1 when this is not a kmem-limited memcg. | |
783 | */ | |
784 | static inline int memcg_cache_id(struct mem_cgroup *memcg) | |
785 | { | |
786 | return memcg ? memcg->kmemcg_id : -1; | |
787 | } | |
788 | ||
789 | /** | |
790 | * memcg_kmem_update_page_stat - update kmem page state statistics | |
791 | * @page: the page | |
792 | * @idx: page state item to account | |
793 | * @val: number of pages (positive or negative) | |
794 | */ | |
795 | static inline void memcg_kmem_update_page_stat(struct page *page, | |
796 | enum mem_cgroup_stat_index idx, int val) | |
797 | { | |
798 | if (memcg_kmem_enabled() && page->mem_cgroup) | |
799 | this_cpu_add(page->mem_cgroup->stat->count[idx], val); | |
800 | } | |
801 | ||
802 | #else | |
803 | #define for_each_memcg_cache_index(_idx) \ | |
804 | for (; NULL; ) | |
805 | ||
806 | static inline bool memcg_kmem_enabled(void) | |
807 | { | |
808 | return false; | |
809 | } | |
810 | ||
811 | static inline int memcg_cache_id(struct mem_cgroup *memcg) | |
812 | { | |
813 | return -1; | |
814 | } | |
815 | ||
816 | static inline void memcg_get_cache_ids(void) | |
817 | { | |
818 | } | |
819 | ||
820 | static inline void memcg_put_cache_ids(void) | |
821 | { | |
822 | } | |
823 | ||
824 | static inline void memcg_kmem_update_page_stat(struct page *page, | |
825 | enum mem_cgroup_stat_index idx, int val) | |
826 | { | |
827 | } | |
828 | #endif /* CONFIG_MEMCG && !CONFIG_SLOB */ | |
829 | ||
830 | #endif /* _LINUX_MEMCONTROL_H */ |