1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
2 | /* memcontrol.h - Memory Controller |
3 | * |
4 | * Copyright IBM Corporation, 2007 |
5 | * Author Balbir Singh <balbir@linux.vnet.ibm.com> |
6 | * |
7 | * Copyright 2007 OpenVZ SWsoft Inc |
8 | * Author: Pavel Emelianov <xemul@openvz.org> |
9 | */ |
10 | |
11 | #ifndef _LINUX_MEMCONTROL_H |
12 | #define _LINUX_MEMCONTROL_H |
13 | #include <linux/cgroup.h> |
14 | #include <linux/vm_event_item.h> |
15 | #include <linux/hardirq.h> |
16 | #include <linux/jump_label.h> |
17 | #include <linux/page_counter.h> |
18 | #include <linux/vmpressure.h> |
19 | #include <linux/eventfd.h> |
20 | #include <linux/mm.h> |
21 | #include <linux/vmstat.h> |
22 | #include <linux/writeback.h> |
23 | #include <linux/page-flags.h> |
24 | |
25 | struct mem_cgroup; |
26 | struct obj_cgroup; |
27 | struct page; |
28 | struct mm_struct; |
29 | struct kmem_cache; |
30 | |
31 | /* Cgroup-specific page state, on top of universal node page state */ |
32 | enum memcg_stat_item { |
33 | MEMCG_SWAP = NR_VM_NODE_STAT_ITEMS, |
34 | MEMCG_SOCK, |
35 | MEMCG_PERCPU_B, |
36 | MEMCG_VMALLOC, |
37 | MEMCG_KMEM, |
38 | MEMCG_ZSWAP_B, |
39 | MEMCG_ZSWAPPED, |
40 | MEMCG_NR_STAT, |
41 | }; |
42 | |
43 | enum memcg_memory_event { |
44 | MEMCG_LOW, |
45 | MEMCG_HIGH, |
46 | MEMCG_MAX, |
47 | MEMCG_OOM, |
48 | MEMCG_OOM_KILL, |
49 | MEMCG_OOM_GROUP_KILL, |
50 | MEMCG_SWAP_HIGH, |
51 | MEMCG_SWAP_MAX, |
52 | MEMCG_SWAP_FAIL, |
53 | MEMCG_NR_MEMORY_EVENTS, |
54 | }; |
55 | |
56 | struct mem_cgroup_reclaim_cookie { |
57 | pg_data_t *pgdat; |
58 | unsigned int generation; |
59 | }; |
60 | |
61 | #ifdef CONFIG_MEMCG |
62 | |
63 | #define MEM_CGROUP_ID_SHIFT 16 |
64 | #define MEM_CGROUP_ID_MAX USHRT_MAX |
65 | |
66 | struct mem_cgroup_id { |
67 | int id; |
68 | refcount_t ref; |
69 | }; |
70 | |
71 | /* |
72 | * Per memcg event counter is incremented at every pagein/pageout. With THP, |
73 | * it will be incremented by the number of pages. This counter is used |
74 | * to trigger some periodic events. This is straightforward and better |
75 | * than using jiffies etc. to handle periodic memcg event. |
76 | */ |
77 | enum mem_cgroup_events_target { |
78 | MEM_CGROUP_TARGET_THRESH, |
79 | MEM_CGROUP_TARGET_SOFTLIMIT, |
80 | MEM_CGROUP_NTARGETS, |
81 | }; |
82 | |
83 | struct memcg_vmstats_percpu { |
84 | /* Local (CPU and cgroup) page state & events */ |
85 | long state[MEMCG_NR_STAT]; |
86 | unsigned long events[NR_VM_EVENT_ITEMS]; |
87 | |
88 | /* Delta calculation for lockless upward propagation */ |
89 | long state_prev[MEMCG_NR_STAT]; |
90 | unsigned long events_prev[NR_VM_EVENT_ITEMS]; |
91 | |
92 | /* Cgroup1: threshold notifications & softlimit tree updates */ |
93 | unsigned long nr_page_events; |
94 | unsigned long targets[MEM_CGROUP_NTARGETS]; |
95 | }; |
96 | |
97 | struct memcg_vmstats { |
98 | /* Aggregated (CPU and subtree) page state & events */ |
99 | long state[MEMCG_NR_STAT]; |
100 | unsigned long events[NR_VM_EVENT_ITEMS]; |
101 | |
102 | /* Pending child counts during tree propagation */ |
103 | long state_pending[MEMCG_NR_STAT]; |
104 | unsigned long events_pending[NR_VM_EVENT_ITEMS]; |
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 | * Bitmap and deferred work of shrinker::id corresponding to memcg-aware |
115 | * shrinkers, which have elements charged to this memcg. |
116 | */ |
117 | struct shrinker_info { |
118 | struct rcu_head rcu; |
119 | atomic_long_t *nr_deferred; |
120 | unsigned long *map; |
121 | }; |
122 | |
123 | struct lruvec_stats_percpu { |
124 | /* Local (CPU and cgroup) state */ |
125 | long state[NR_VM_NODE_STAT_ITEMS]; |
126 | |
127 | /* Delta calculation for lockless upward propagation */ |
128 | long state_prev[NR_VM_NODE_STAT_ITEMS]; |
129 | }; |
130 | |
131 | struct lruvec_stats { |
132 | /* Aggregated (CPU and subtree) state */ |
133 | long state[NR_VM_NODE_STAT_ITEMS]; |
134 | |
135 | /* Pending child counts during tree propagation */ |
136 | long state_pending[NR_VM_NODE_STAT_ITEMS]; |
137 | }; |
138 | |
139 | /* |
140 | * per-node information in memory controller. |
141 | */ |
142 | struct mem_cgroup_per_node { |
143 | struct lruvec lruvec; |
144 | |
145 | struct lruvec_stats_percpu __percpu *lruvec_stats_percpu; |
146 | struct lruvec_stats lruvec_stats; |
147 | |
148 | unsigned long lru_zone_size[MAX_NR_ZONES][NR_LRU_LISTS]; |
149 | |
150 | struct mem_cgroup_reclaim_iter iter; |
151 | |
152 | struct shrinker_info __rcu *shrinker_info; |
153 | |
154 | struct rb_node tree_node; /* RB tree node */ |
155 | unsigned long usage_in_excess;/* Set to the value by which */ |
156 | /* the soft limit is exceeded*/ |
157 | bool on_tree; |
158 | struct mem_cgroup *memcg; /* Back pointer, we cannot */ |
159 | /* use container_of */ |
160 | }; |
161 | |
162 | struct mem_cgroup_threshold { |
163 | struct eventfd_ctx *eventfd; |
164 | unsigned long threshold; |
165 | }; |
166 | |
167 | /* For threshold */ |
168 | struct mem_cgroup_threshold_ary { |
169 | /* An array index points to threshold just below or equal to usage. */ |
170 | int current_threshold; |
171 | /* Size of entries[] */ |
172 | unsigned int size; |
173 | /* Array of thresholds */ |
174 | struct mem_cgroup_threshold entries[]; |
175 | }; |
176 | |
177 | struct mem_cgroup_thresholds { |
178 | /* Primary thresholds array */ |
179 | struct mem_cgroup_threshold_ary *primary; |
180 | /* |
181 | * Spare threshold array. |
182 | * This is needed to make mem_cgroup_unregister_event() "never fail". |
183 | * It must be able to store at least primary->size - 1 entries. |
184 | */ |
185 | struct mem_cgroup_threshold_ary *spare; |
186 | }; |
187 | |
188 | #if defined(CONFIG_SMP) |
189 | struct memcg_padding { |
190 | char x[0]; |
191 | } ____cacheline_internodealigned_in_smp; |
192 | #define MEMCG_PADDING(name) struct memcg_padding name |
193 | #else |
194 | #define MEMCG_PADDING(name) |
195 | #endif |
196 | |
197 | /* |
198 | * Remember four most recent foreign writebacks with dirty pages in this |
199 | * cgroup. Inode sharing is expected to be uncommon and, even if we miss |
200 | * one in a given round, we're likely to catch it later if it keeps |
201 | * foreign-dirtying, so a fairly low count should be enough. |
202 | * |
203 | * See mem_cgroup_track_foreign_dirty_slowpath() for details. |
204 | */ |
205 | #define MEMCG_CGWB_FRN_CNT 4 |
206 | |
207 | struct memcg_cgwb_frn { |
208 | u64 bdi_id; /* bdi->id of the foreign inode */ |
209 | int memcg_id; /* memcg->css.id of foreign inode */ |
210 | u64 at; /* jiffies_64 at the time of dirtying */ |
211 | struct wb_completion done; /* tracks in-flight foreign writebacks */ |
212 | }; |
213 | |
214 | /* |
215 | * Bucket for arbitrarily byte-sized objects charged to a memory |
216 | * cgroup. The bucket can be reparented in one piece when the cgroup |
217 | * is destroyed, without having to round up the individual references |
218 | * of all live memory objects in the wild. |
219 | */ |
220 | struct obj_cgroup { |
221 | struct percpu_ref refcnt; |
222 | struct mem_cgroup *memcg; |
223 | atomic_t nr_charged_bytes; |
224 | union { |
225 | struct list_head list; /* protected by objcg_lock */ |
226 | struct rcu_head rcu; |
227 | }; |
228 | }; |
229 | |
230 | /* |
231 | * The memory controller data structure. The memory controller controls both |
232 | * page cache and RSS per cgroup. We would eventually like to provide |
233 | * statistics based on the statistics developed by Rik Van Riel for clock-pro, |
234 | * to help the administrator determine what knobs to tune. |
235 | */ |
236 | struct mem_cgroup { |
237 | struct cgroup_subsys_state css; |
238 | |
239 | /* Private memcg ID. Used to ID objects that outlive the cgroup */ |
240 | struct mem_cgroup_id id; |
241 | |
242 | /* Accounted resources */ |
243 | struct page_counter memory; /* Both v1 & v2 */ |
244 | |
245 | union { |
246 | struct page_counter swap; /* v2 only */ |
247 | struct page_counter memsw; /* v1 only */ |
248 | }; |
249 | |
250 | /* Legacy consumer-oriented counters */ |
251 | struct page_counter kmem; /* v1 only */ |
252 | struct page_counter tcpmem; /* v1 only */ |
253 | |
254 | /* Range enforcement for interrupt charges */ |
255 | struct work_struct high_work; |
256 | |
257 | #if defined(CONFIG_MEMCG_KMEM) && defined(CONFIG_ZSWAP) |
258 | unsigned long zswap_max; |
259 | #endif |
260 | |
261 | unsigned long soft_limit; |
262 | |
263 | /* vmpressure notifications */ |
264 | struct vmpressure vmpressure; |
265 | |
266 | /* |
267 | * Should the OOM killer kill all belonging tasks, had it kill one? |
268 | */ |
269 | bool oom_group; |
270 | |
271 | /* protected by memcg_oom_lock */ |
272 | bool oom_lock; |
273 | int under_oom; |
274 | |
275 | int swappiness; |
276 | /* OOM-Killer disable */ |
277 | int oom_kill_disable; |
278 | |
279 | /* memory.events and memory.events.local */ |
280 | struct cgroup_file events_file; |
281 | struct cgroup_file events_local_file; |
282 | |
283 | /* handle for "memory.swap.events" */ |
284 | struct cgroup_file swap_events_file; |
285 | |
286 | /* protect arrays of thresholds */ |
287 | struct mutex thresholds_lock; |
288 | |
289 | /* thresholds for memory usage. RCU-protected */ |
290 | struct mem_cgroup_thresholds thresholds; |
291 | |
292 | /* thresholds for mem+swap usage. RCU-protected */ |
293 | struct mem_cgroup_thresholds memsw_thresholds; |
294 | |
295 | /* For oom notifier event fd */ |
296 | struct list_head oom_notify; |
297 | |
298 | /* |
299 | * Should we move charges of a task when a task is moved into this |
300 | * mem_cgroup ? And what type of charges should we move ? |
301 | */ |
302 | unsigned long move_charge_at_immigrate; |
303 | /* taken only while moving_account > 0 */ |
304 | spinlock_t move_lock; |
305 | unsigned long move_lock_flags; |
306 | |
307 | MEMCG_PADDING(_pad1_); |
308 | |
309 | /* memory.stat */ |
310 | struct memcg_vmstats vmstats; |
311 | |
312 | /* memory.events */ |
313 | atomic_long_t memory_events[MEMCG_NR_MEMORY_EVENTS]; |
314 | atomic_long_t memory_events_local[MEMCG_NR_MEMORY_EVENTS]; |
315 | |
316 | unsigned long socket_pressure; |
317 | |
318 | /* Legacy tcp memory accounting */ |
319 | bool tcpmem_active; |
320 | int tcpmem_pressure; |
321 | |
322 | #ifdef CONFIG_MEMCG_KMEM |
323 | int kmemcg_id; |
324 | struct obj_cgroup __rcu *objcg; |
325 | /* list of inherited objcgs, protected by objcg_lock */ |
326 | struct list_head objcg_list; |
327 | #endif |
328 | |
329 | MEMCG_PADDING(_pad2_); |
330 | |
331 | /* |
332 | * set > 0 if pages under this cgroup are moving to other cgroup. |
333 | */ |
334 | atomic_t moving_account; |
335 | struct task_struct *move_lock_task; |
336 | |
337 | struct memcg_vmstats_percpu __percpu *vmstats_percpu; |
338 | |
339 | #ifdef CONFIG_CGROUP_WRITEBACK |
340 | struct list_head cgwb_list; |
341 | struct wb_domain cgwb_domain; |
342 | struct memcg_cgwb_frn cgwb_frn[MEMCG_CGWB_FRN_CNT]; |
343 | #endif |
344 | |
345 | /* List of events which userspace want to receive */ |
346 | struct list_head event_list; |
347 | spinlock_t event_list_lock; |
348 | |
349 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
350 | struct deferred_split deferred_split_queue; |
351 | #endif |
352 | |
353 | struct mem_cgroup_per_node *nodeinfo[]; |
354 | }; |
355 | |
356 | /* |
357 | * size of first charge trial. "32" comes from vmscan.c's magic value. |
358 | * TODO: maybe necessary to use big numbers in big irons. |
359 | */ |
360 | #define MEMCG_CHARGE_BATCH 32U |
361 | |
362 | extern struct mem_cgroup *root_mem_cgroup; |
363 | |
364 | enum page_memcg_data_flags { |
365 | /* page->memcg_data is a pointer to an objcgs vector */ |
366 | MEMCG_DATA_OBJCGS = (1UL << 0), |
367 | /* page has been accounted as a non-slab kernel page */ |
368 | MEMCG_DATA_KMEM = (1UL << 1), |
369 | /* the next bit after the last actual flag */ |
370 | __NR_MEMCG_DATA_FLAGS = (1UL << 2), |
371 | }; |
372 | |
373 | #define MEMCG_DATA_FLAGS_MASK (__NR_MEMCG_DATA_FLAGS - 1) |
374 | |
375 | static inline bool folio_memcg_kmem(struct folio *folio); |
376 | |
377 | /* |
378 | * After the initialization objcg->memcg is always pointing at |
379 | * a valid memcg, but can be atomically swapped to the parent memcg. |
380 | * |
381 | * The caller must ensure that the returned memcg won't be released: |
382 | * e.g. acquire the rcu_read_lock or css_set_lock. |
383 | */ |
384 | static inline struct mem_cgroup *obj_cgroup_memcg(struct obj_cgroup *objcg) |
385 | { |
386 | return READ_ONCE(objcg->memcg); |
387 | } |
388 | |
389 | /* |
390 | * __folio_memcg - Get the memory cgroup associated with a non-kmem folio |
391 | * @folio: Pointer to the folio. |
392 | * |
393 | * Returns a pointer to the memory cgroup associated with the folio, |
394 | * or NULL. This function assumes that the folio is known to have a |
395 | * proper memory cgroup pointer. It's not safe to call this function |
396 | * against some type of folios, e.g. slab folios or ex-slab folios or |
397 | * kmem folios. |
398 | */ |
399 | static inline struct mem_cgroup *__folio_memcg(struct folio *folio) |
400 | { |
401 | unsigned long memcg_data = folio->memcg_data; |
402 | |
403 | VM_BUG_ON_FOLIO(folio_test_slab(folio), folio); |
404 | VM_BUG_ON_FOLIO(memcg_data & MEMCG_DATA_OBJCGS, folio); |
405 | VM_BUG_ON_FOLIO(memcg_data & MEMCG_DATA_KMEM, folio); |
406 | |
407 | return (struct mem_cgroup *)(memcg_data & ~MEMCG_DATA_FLAGS_MASK); |
408 | } |
409 | |
410 | /* |
411 | * __folio_objcg - get the object cgroup associated with a kmem folio. |
412 | * @folio: Pointer to the folio. |
413 | * |
414 | * Returns a pointer to the object cgroup associated with the folio, |
415 | * or NULL. This function assumes that the folio is known to have a |
416 | * proper object cgroup pointer. It's not safe to call this function |
417 | * against some type of folios, e.g. slab folios or ex-slab folios or |
418 | * LRU folios. |
419 | */ |
420 | static inline struct obj_cgroup *__folio_objcg(struct folio *folio) |
421 | { |
422 | unsigned long memcg_data = folio->memcg_data; |
423 | |
424 | VM_BUG_ON_FOLIO(folio_test_slab(folio), folio); |
425 | VM_BUG_ON_FOLIO(memcg_data & MEMCG_DATA_OBJCGS, folio); |
426 | VM_BUG_ON_FOLIO(!(memcg_data & MEMCG_DATA_KMEM), folio); |
427 | |
428 | return (struct obj_cgroup *)(memcg_data & ~MEMCG_DATA_FLAGS_MASK); |
429 | } |
430 | |
431 | /* |
432 | * folio_memcg - Get the memory cgroup associated with a folio. |
433 | * @folio: Pointer to the folio. |
434 | * |
435 | * Returns a pointer to the memory cgroup associated with the folio, |
436 | * or NULL. This function assumes that the folio is known to have a |
437 | * proper memory cgroup pointer. It's not safe to call this function |
438 | * against some type of folios, e.g. slab folios or ex-slab folios. |
439 | * |
440 | * For a non-kmem folio any of the following ensures folio and memcg binding |
441 | * stability: |
442 | * |
443 | * - the folio lock |
444 | * - LRU isolation |
445 | * - lock_page_memcg() |
446 | * - exclusive reference |
447 | * |
448 | * For a kmem folio a caller should hold an rcu read lock to protect memcg |
449 | * associated with a kmem folio from being released. |
450 | */ |
451 | static inline struct mem_cgroup *folio_memcg(struct folio *folio) |
452 | { |
453 | if (folio_memcg_kmem(folio)) |
454 | return obj_cgroup_memcg(__folio_objcg(folio)); |
455 | return __folio_memcg(folio); |
456 | } |
457 | |
458 | static inline struct mem_cgroup *page_memcg(struct page *page) |
459 | { |
460 | return folio_memcg(page_folio(page)); |
461 | } |
462 | |
463 | /** |
464 | * folio_memcg_rcu - Locklessly get the memory cgroup associated with a folio. |
465 | * @folio: Pointer to the folio. |
466 | * |
467 | * This function assumes that the folio is known to have a |
468 | * proper memory cgroup pointer. It's not safe to call this function |
469 | * against some type of folios, e.g. slab folios or ex-slab folios. |
470 | * |
471 | * Return: A pointer to the memory cgroup associated with the folio, |
472 | * or NULL. |
473 | */ |
474 | static inline struct mem_cgroup *folio_memcg_rcu(struct folio *folio) |
475 | { |
476 | unsigned long memcg_data = READ_ONCE(folio->memcg_data); |
477 | |
478 | VM_BUG_ON_FOLIO(folio_test_slab(folio), folio); |
479 | WARN_ON_ONCE(!rcu_read_lock_held()); |
480 | |
481 | if (memcg_data & MEMCG_DATA_KMEM) { |
482 | struct obj_cgroup *objcg; |
483 | |
484 | objcg = (void *)(memcg_data & ~MEMCG_DATA_FLAGS_MASK); |
485 | return obj_cgroup_memcg(objcg); |
486 | } |
487 | |
488 | return (struct mem_cgroup *)(memcg_data & ~MEMCG_DATA_FLAGS_MASK); |
489 | } |
490 | |
491 | /* |
492 | * page_memcg_check - get the memory cgroup associated with a page |
493 | * @page: a pointer to the page struct |
494 | * |
495 | * Returns a pointer to the memory cgroup associated with the page, |
496 | * or NULL. This function unlike page_memcg() can take any page |
497 | * as an argument. It has to be used in cases when it's not known if a page |
498 | * has an associated memory cgroup pointer or an object cgroups vector or |
499 | * an object cgroup. |
500 | * |
501 | * For a non-kmem page any of the following ensures page and memcg binding |
502 | * stability: |
503 | * |
504 | * - the page lock |
505 | * - LRU isolation |
506 | * - lock_page_memcg() |
507 | * - exclusive reference |
508 | * |
509 | * For a kmem page a caller should hold an rcu read lock to protect memcg |
510 | * associated with a kmem page from being released. |
511 | */ |
512 | static inline struct mem_cgroup *page_memcg_check(struct page *page) |
513 | { |
514 | /* |
515 | * Because page->memcg_data might be changed asynchronously |
516 | * for slab pages, READ_ONCE() should be used here. |
517 | */ |
518 | unsigned long memcg_data = READ_ONCE(page->memcg_data); |
519 | |
520 | if (memcg_data & MEMCG_DATA_OBJCGS) |
521 | return NULL; |
522 | |
523 | if (memcg_data & MEMCG_DATA_KMEM) { |
524 | struct obj_cgroup *objcg; |
525 | |
526 | objcg = (void *)(memcg_data & ~MEMCG_DATA_FLAGS_MASK); |
527 | return obj_cgroup_memcg(objcg); |
528 | } |
529 | |
530 | return (struct mem_cgroup *)(memcg_data & ~MEMCG_DATA_FLAGS_MASK); |
531 | } |
532 | |
533 | static inline struct mem_cgroup *get_mem_cgroup_from_objcg(struct obj_cgroup *objcg) |
534 | { |
535 | struct mem_cgroup *memcg; |
536 | |
537 | rcu_read_lock(); |
538 | retry: |
539 | memcg = obj_cgroup_memcg(objcg); |
540 | if (unlikely(!css_tryget(&memcg->css))) |
541 | goto retry; |
542 | rcu_read_unlock(); |
543 | |
544 | return memcg; |
545 | } |
546 | |
547 | #ifdef CONFIG_MEMCG_KMEM |
548 | /* |
549 | * folio_memcg_kmem - Check if the folio has the memcg_kmem flag set. |
550 | * @folio: Pointer to the folio. |
551 | * |
552 | * Checks if the folio has MemcgKmem flag set. The caller must ensure |
553 | * that the folio has an associated memory cgroup. It's not safe to call |
554 | * this function against some types of folios, e.g. slab folios. |
555 | */ |
556 | static inline bool folio_memcg_kmem(struct folio *folio) |
557 | { |
558 | VM_BUG_ON_PGFLAGS(PageTail(&folio->page), &folio->page); |
559 | VM_BUG_ON_FOLIO(folio->memcg_data & MEMCG_DATA_OBJCGS, folio); |
560 | return folio->memcg_data & MEMCG_DATA_KMEM; |
561 | } |
562 | |
563 | |
564 | #else |
565 | static inline bool folio_memcg_kmem(struct folio *folio) |
566 | { |
567 | return false; |
568 | } |
569 | |
570 | #endif |
571 | |
572 | static inline bool PageMemcgKmem(struct page *page) |
573 | { |
574 | return folio_memcg_kmem(page_folio(page)); |
575 | } |
576 | |
577 | static inline bool mem_cgroup_is_root(struct mem_cgroup *memcg) |
578 | { |
579 | return (memcg == root_mem_cgroup); |
580 | } |
581 | |
582 | static inline bool mem_cgroup_disabled(void) |
583 | { |
584 | return !cgroup_subsys_enabled(memory_cgrp_subsys); |
585 | } |
586 | |
587 | static inline void mem_cgroup_protection(struct mem_cgroup *root, |
588 | struct mem_cgroup *memcg, |
589 | unsigned long *min, |
590 | unsigned long *low) |
591 | { |
592 | *min = *low = 0; |
593 | |
594 | if (mem_cgroup_disabled()) |
595 | return; |
596 | |
597 | /* |
598 | * There is no reclaim protection applied to a targeted reclaim. |
599 | * We are special casing this specific case here because |
600 | * mem_cgroup_protected calculation is not robust enough to keep |
601 | * the protection invariant for calculated effective values for |
602 | * parallel reclaimers with different reclaim target. This is |
603 | * especially a problem for tail memcgs (as they have pages on LRU) |
604 | * which would want to have effective values 0 for targeted reclaim |
605 | * but a different value for external reclaim. |
606 | * |
607 | * Example |
608 | * Let's have global and A's reclaim in parallel: |
609 | * | |
610 | * A (low=2G, usage = 3G, max = 3G, children_low_usage = 1.5G) |
611 | * |\ |
612 | * | C (low = 1G, usage = 2.5G) |
613 | * B (low = 1G, usage = 0.5G) |
614 | * |
615 | * For the global reclaim |
616 | * A.elow = A.low |
617 | * B.elow = min(B.usage, B.low) because children_low_usage <= A.elow |
618 | * C.elow = min(C.usage, C.low) |
619 | * |
620 | * With the effective values resetting we have A reclaim |
621 | * A.elow = 0 |
622 | * B.elow = B.low |
623 | * C.elow = C.low |
624 | * |
625 | * If the global reclaim races with A's reclaim then |
626 | * B.elow = C.elow = 0 because children_low_usage > A.elow) |
627 | * is possible and reclaiming B would be violating the protection. |
628 | * |
629 | */ |
630 | if (root == memcg) |
631 | return; |
632 | |
633 | *min = READ_ONCE(memcg->memory.emin); |
634 | *low = READ_ONCE(memcg->memory.elow); |
635 | } |
636 | |
637 | void mem_cgroup_calculate_protection(struct mem_cgroup *root, |
638 | struct mem_cgroup *memcg); |
639 | |
640 | static inline bool mem_cgroup_supports_protection(struct mem_cgroup *memcg) |
641 | { |
642 | /* |
643 | * The root memcg doesn't account charges, and doesn't support |
644 | * protection. |
645 | */ |
646 | return !mem_cgroup_disabled() && !mem_cgroup_is_root(memcg); |
647 | |
648 | } |
649 | |
650 | static inline bool mem_cgroup_below_low(struct mem_cgroup *memcg) |
651 | { |
652 | if (!mem_cgroup_supports_protection(memcg)) |
653 | return false; |
654 | |
655 | return READ_ONCE(memcg->memory.elow) >= |
656 | page_counter_read(&memcg->memory); |
657 | } |
658 | |
659 | static inline bool mem_cgroup_below_min(struct mem_cgroup *memcg) |
660 | { |
661 | if (!mem_cgroup_supports_protection(memcg)) |
662 | return false; |
663 | |
664 | return READ_ONCE(memcg->memory.emin) >= |
665 | page_counter_read(&memcg->memory); |
666 | } |
667 | |
668 | int __mem_cgroup_charge(struct folio *folio, struct mm_struct *mm, gfp_t gfp); |
669 | |
670 | /** |
671 | * mem_cgroup_charge - Charge a newly allocated folio to a cgroup. |
672 | * @folio: Folio to charge. |
673 | * @mm: mm context of the allocating task. |
674 | * @gfp: Reclaim mode. |
675 | * |
676 | * Try to charge @folio to the memcg that @mm belongs to, reclaiming |
677 | * pages according to @gfp if necessary. If @mm is NULL, try to |
678 | * charge to the active memcg. |
679 | * |
680 | * Do not use this for folios allocated for swapin. |
681 | * |
682 | * Return: 0 on success. Otherwise, an error code is returned. |
683 | */ |
684 | static inline int mem_cgroup_charge(struct folio *folio, struct mm_struct *mm, |
685 | gfp_t gfp) |
686 | { |
687 | if (mem_cgroup_disabled()) |
688 | return 0; |
689 | return __mem_cgroup_charge(folio, mm, gfp); |
690 | } |
691 | |
692 | int mem_cgroup_swapin_charge_page(struct page *page, struct mm_struct *mm, |
693 | gfp_t gfp, swp_entry_t entry); |
694 | void mem_cgroup_swapin_uncharge_swap(swp_entry_t entry); |
695 | |
696 | void __mem_cgroup_uncharge(struct folio *folio); |
697 | |
698 | /** |
699 | * mem_cgroup_uncharge - Uncharge a folio. |
700 | * @folio: Folio to uncharge. |
701 | * |
702 | * Uncharge a folio previously charged with mem_cgroup_charge(). |
703 | */ |
704 | static inline void mem_cgroup_uncharge(struct folio *folio) |
705 | { |
706 | if (mem_cgroup_disabled()) |
707 | return; |
708 | __mem_cgroup_uncharge(folio); |
709 | } |
710 | |
711 | void __mem_cgroup_uncharge_list(struct list_head *page_list); |
712 | static inline void mem_cgroup_uncharge_list(struct list_head *page_list) |
713 | { |
714 | if (mem_cgroup_disabled()) |
715 | return; |
716 | __mem_cgroup_uncharge_list(page_list); |
717 | } |
718 | |
719 | void mem_cgroup_migrate(struct folio *old, struct folio *new); |
720 | |
721 | /** |
722 | * mem_cgroup_lruvec - get the lru list vector for a memcg & node |
723 | * @memcg: memcg of the wanted lruvec |
724 | * @pgdat: pglist_data |
725 | * |
726 | * Returns the lru list vector holding pages for a given @memcg & |
727 | * @pgdat combination. This can be the node lruvec, if the memory |
728 | * controller is disabled. |
729 | */ |
730 | static inline struct lruvec *mem_cgroup_lruvec(struct mem_cgroup *memcg, |
731 | struct pglist_data *pgdat) |
732 | { |
733 | struct mem_cgroup_per_node *mz; |
734 | struct lruvec *lruvec; |
735 | |
736 | if (mem_cgroup_disabled()) { |
737 | lruvec = &pgdat->__lruvec; |
738 | goto out; |
739 | } |
740 | |
741 | if (!memcg) |
742 | memcg = root_mem_cgroup; |
743 | |
744 | mz = memcg->nodeinfo[pgdat->node_id]; |
745 | lruvec = &mz->lruvec; |
746 | out: |
747 | /* |
748 | * Since a node can be onlined after the mem_cgroup was created, |
749 | * we have to be prepared to initialize lruvec->pgdat here; |
750 | * and if offlined then reonlined, we need to reinitialize it. |
751 | */ |
752 | if (unlikely(lruvec->pgdat != pgdat)) |
753 | lruvec->pgdat = pgdat; |
754 | return lruvec; |
755 | } |
756 | |
757 | /** |
758 | * folio_lruvec - return lruvec for isolating/putting an LRU folio |
759 | * @folio: Pointer to the folio. |
760 | * |
761 | * This function relies on folio->mem_cgroup being stable. |
762 | */ |
763 | static inline struct lruvec *folio_lruvec(struct folio *folio) |
764 | { |
765 | struct mem_cgroup *memcg = folio_memcg(folio); |
766 | |
767 | VM_WARN_ON_ONCE_FOLIO(!memcg && !mem_cgroup_disabled(), folio); |
768 | return mem_cgroup_lruvec(memcg, folio_pgdat(folio)); |
769 | } |
770 | |
771 | struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p); |
772 | |
773 | struct mem_cgroup *get_mem_cgroup_from_mm(struct mm_struct *mm); |
774 | |
775 | struct lruvec *folio_lruvec_lock(struct folio *folio); |
776 | struct lruvec *folio_lruvec_lock_irq(struct folio *folio); |
777 | struct lruvec *folio_lruvec_lock_irqsave(struct folio *folio, |
778 | unsigned long *flags); |
779 | |
780 | #ifdef CONFIG_DEBUG_VM |
781 | void lruvec_memcg_debug(struct lruvec *lruvec, struct folio *folio); |
782 | #else |
783 | static inline |
784 | void lruvec_memcg_debug(struct lruvec *lruvec, struct folio *folio) |
785 | { |
786 | } |
787 | #endif |
788 | |
789 | static inline |
790 | struct mem_cgroup *mem_cgroup_from_css(struct cgroup_subsys_state *css){ |
791 | return css ? container_of(css, struct mem_cgroup, css) : NULL; |
792 | } |
793 | |
794 | static inline bool obj_cgroup_tryget(struct obj_cgroup *objcg) |
795 | { |
796 | return percpu_ref_tryget(&objcg->refcnt); |
797 | } |
798 | |
799 | static inline void obj_cgroup_get(struct obj_cgroup *objcg) |
800 | { |
801 | percpu_ref_get(&objcg->refcnt); |
802 | } |
803 | |
804 | static inline void obj_cgroup_get_many(struct obj_cgroup *objcg, |
805 | unsigned long nr) |
806 | { |
807 | percpu_ref_get_many(&objcg->refcnt, nr); |
808 | } |
809 | |
810 | static inline void obj_cgroup_put(struct obj_cgroup *objcg) |
811 | { |
812 | percpu_ref_put(&objcg->refcnt); |
813 | } |
814 | |
815 | static inline void mem_cgroup_put(struct mem_cgroup *memcg) |
816 | { |
817 | if (memcg) |
818 | css_put(&memcg->css); |
819 | } |
820 | |
821 | #define mem_cgroup_from_counter(counter, member) \ |
822 | container_of(counter, struct mem_cgroup, member) |
823 | |
824 | struct mem_cgroup *mem_cgroup_iter(struct mem_cgroup *, |
825 | struct mem_cgroup *, |
826 | struct mem_cgroup_reclaim_cookie *); |
827 | void mem_cgroup_iter_break(struct mem_cgroup *, struct mem_cgroup *); |
828 | int mem_cgroup_scan_tasks(struct mem_cgroup *, |
829 | int (*)(struct task_struct *, void *), void *); |
830 | |
831 | static inline unsigned short mem_cgroup_id(struct mem_cgroup *memcg) |
832 | { |
833 | if (mem_cgroup_disabled()) |
834 | return 0; |
835 | |
836 | return memcg->id.id; |
837 | } |
838 | struct mem_cgroup *mem_cgroup_from_id(unsigned short id); |
839 | |
840 | #ifdef CONFIG_SHRINKER_DEBUG |
841 | static inline unsigned long mem_cgroup_ino(struct mem_cgroup *memcg) |
842 | { |
843 | return memcg ? cgroup_ino(memcg->css.cgroup) : 0; |
844 | } |
845 | |
846 | struct mem_cgroup *mem_cgroup_get_from_ino(unsigned long ino); |
847 | #endif |
848 | |
849 | static inline struct mem_cgroup *mem_cgroup_from_seq(struct seq_file *m) |
850 | { |
851 | return mem_cgroup_from_css(seq_css(m)); |
852 | } |
853 | |
854 | static inline struct mem_cgroup *lruvec_memcg(struct lruvec *lruvec) |
855 | { |
856 | struct mem_cgroup_per_node *mz; |
857 | |
858 | if (mem_cgroup_disabled()) |
859 | return NULL; |
860 | |
861 | mz = container_of(lruvec, struct mem_cgroup_per_node, lruvec); |
862 | return mz->memcg; |
863 | } |
864 | |
865 | /** |
866 | * parent_mem_cgroup - find the accounting parent of a memcg |
867 | * @memcg: memcg whose parent to find |
868 | * |
869 | * Returns the parent memcg, or NULL if this is the root or the memory |
870 | * controller is in legacy no-hierarchy mode. |
871 | */ |
872 | static inline struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg) |
873 | { |
874 | return mem_cgroup_from_css(memcg->css.parent); |
875 | } |
876 | |
877 | static inline bool mem_cgroup_is_descendant(struct mem_cgroup *memcg, |
878 | struct mem_cgroup *root) |
879 | { |
880 | if (root == memcg) |
881 | return true; |
882 | return cgroup_is_descendant(memcg->css.cgroup, root->css.cgroup); |
883 | } |
884 | |
885 | static inline bool mm_match_cgroup(struct mm_struct *mm, |
886 | struct mem_cgroup *memcg) |
887 | { |
888 | struct mem_cgroup *task_memcg; |
889 | bool match = false; |
890 | |
891 | rcu_read_lock(); |
892 | task_memcg = mem_cgroup_from_task(rcu_dereference(mm->owner)); |
893 | if (task_memcg) |
894 | match = mem_cgroup_is_descendant(task_memcg, memcg); |
895 | rcu_read_unlock(); |
896 | return match; |
897 | } |
898 | |
899 | struct cgroup_subsys_state *mem_cgroup_css_from_page(struct page *page); |
900 | ino_t page_cgroup_ino(struct page *page); |
901 | |
902 | static inline bool mem_cgroup_online(struct mem_cgroup *memcg) |
903 | { |
904 | if (mem_cgroup_disabled()) |
905 | return true; |
906 | return !!(memcg->css.flags & CSS_ONLINE); |
907 | } |
908 | |
909 | void mem_cgroup_update_lru_size(struct lruvec *lruvec, enum lru_list lru, |
910 | int zid, int nr_pages); |
911 | |
912 | static inline |
913 | unsigned long mem_cgroup_get_zone_lru_size(struct lruvec *lruvec, |
914 | enum lru_list lru, int zone_idx) |
915 | { |
916 | struct mem_cgroup_per_node *mz; |
917 | |
918 | mz = container_of(lruvec, struct mem_cgroup_per_node, lruvec); |
919 | return READ_ONCE(mz->lru_zone_size[zone_idx][lru]); |
920 | } |
921 | |
922 | void mem_cgroup_handle_over_high(void); |
923 | |
924 | unsigned long mem_cgroup_get_max(struct mem_cgroup *memcg); |
925 | |
926 | unsigned long mem_cgroup_size(struct mem_cgroup *memcg); |
927 | |
928 | void mem_cgroup_print_oom_context(struct mem_cgroup *memcg, |
929 | struct task_struct *p); |
930 | |
931 | void mem_cgroup_print_oom_meminfo(struct mem_cgroup *memcg); |
932 | |
933 | static inline void mem_cgroup_enter_user_fault(void) |
934 | { |
935 | WARN_ON(current->in_user_fault); |
936 | current->in_user_fault = 1; |
937 | } |
938 | |
939 | static inline void mem_cgroup_exit_user_fault(void) |
940 | { |
941 | WARN_ON(!current->in_user_fault); |
942 | current->in_user_fault = 0; |
943 | } |
944 | |
945 | static inline bool task_in_memcg_oom(struct task_struct *p) |
946 | { |
947 | return p->memcg_in_oom; |
948 | } |
949 | |
950 | bool mem_cgroup_oom_synchronize(bool wait); |
951 | struct mem_cgroup *mem_cgroup_get_oom_group(struct task_struct *victim, |
952 | struct mem_cgroup *oom_domain); |
953 | void mem_cgroup_print_oom_group(struct mem_cgroup *memcg); |
954 | |
955 | void folio_memcg_lock(struct folio *folio); |
956 | void folio_memcg_unlock(struct folio *folio); |
957 | void lock_page_memcg(struct page *page); |
958 | void unlock_page_memcg(struct page *page); |
959 | |
960 | void __mod_memcg_state(struct mem_cgroup *memcg, int idx, int val); |
961 | |
962 | /* idx can be of type enum memcg_stat_item or node_stat_item */ |
963 | static inline void mod_memcg_state(struct mem_cgroup *memcg, |
964 | int idx, int val) |
965 | { |
966 | unsigned long flags; |
967 | |
968 | local_irq_save(flags); |
969 | __mod_memcg_state(memcg, idx, val); |
970 | local_irq_restore(flags); |
971 | } |
972 | |
973 | static inline void mod_memcg_page_state(struct page *page, |
974 | int idx, int val) |
975 | { |
976 | struct mem_cgroup *memcg; |
977 | |
978 | if (mem_cgroup_disabled()) |
979 | return; |
980 | |
981 | rcu_read_lock(); |
982 | memcg = page_memcg(page); |
983 | if (memcg) |
984 | mod_memcg_state(memcg, idx, val); |
985 | rcu_read_unlock(); |
986 | } |
987 | |
988 | static inline unsigned long memcg_page_state(struct mem_cgroup *memcg, int idx) |
989 | { |
990 | return READ_ONCE(memcg->vmstats.state[idx]); |
991 | } |
992 | |
993 | static inline unsigned long lruvec_page_state(struct lruvec *lruvec, |
994 | enum node_stat_item idx) |
995 | { |
996 | struct mem_cgroup_per_node *pn; |
997 | |
998 | if (mem_cgroup_disabled()) |
999 | return node_page_state(lruvec_pgdat(lruvec), idx); |
1000 | |
1001 | pn = container_of(lruvec, struct mem_cgroup_per_node, lruvec); |
1002 | return READ_ONCE(pn->lruvec_stats.state[idx]); |
1003 | } |
1004 | |
1005 | static inline unsigned long lruvec_page_state_local(struct lruvec *lruvec, |
1006 | enum node_stat_item idx) |
1007 | { |
1008 | struct mem_cgroup_per_node *pn; |
1009 | long x = 0; |
1010 | int cpu; |
1011 | |
1012 | if (mem_cgroup_disabled()) |
1013 | return node_page_state(lruvec_pgdat(lruvec), idx); |
1014 | |
1015 | pn = container_of(lruvec, struct mem_cgroup_per_node, lruvec); |
1016 | for_each_possible_cpu(cpu) |
1017 | x += per_cpu(pn->lruvec_stats_percpu->state[idx], cpu); |
1018 | #ifdef CONFIG_SMP |
1019 | if (x < 0) |
1020 | x = 0; |
1021 | #endif |
1022 | return x; |
1023 | } |
1024 | |
1025 | void mem_cgroup_flush_stats(void); |
1026 | void mem_cgroup_flush_stats_delayed(void); |
1027 | |
1028 | void __mod_memcg_lruvec_state(struct lruvec *lruvec, enum node_stat_item idx, |
1029 | int val); |
1030 | void __mod_lruvec_kmem_state(void *p, enum node_stat_item idx, int val); |
1031 | |
1032 | static inline void mod_lruvec_kmem_state(void *p, enum node_stat_item idx, |
1033 | int val) |
1034 | { |
1035 | unsigned long flags; |
1036 | |
1037 | local_irq_save(flags); |
1038 | __mod_lruvec_kmem_state(p, idx, val); |
1039 | local_irq_restore(flags); |
1040 | } |
1041 | |
1042 | static inline void mod_memcg_lruvec_state(struct lruvec *lruvec, |
1043 | enum node_stat_item idx, int val) |
1044 | { |
1045 | unsigned long flags; |
1046 | |
1047 | local_irq_save(flags); |
1048 | __mod_memcg_lruvec_state(lruvec, idx, val); |
1049 | local_irq_restore(flags); |
1050 | } |
1051 | |
1052 | void __count_memcg_events(struct mem_cgroup *memcg, enum vm_event_item idx, |
1053 | unsigned long count); |
1054 | |
1055 | static inline void count_memcg_events(struct mem_cgroup *memcg, |
1056 | enum vm_event_item idx, |
1057 | unsigned long count) |
1058 | { |
1059 | unsigned long flags; |
1060 | |
1061 | local_irq_save(flags); |
1062 | __count_memcg_events(memcg, idx, count); |
1063 | local_irq_restore(flags); |
1064 | } |
1065 | |
1066 | static inline void count_memcg_page_event(struct page *page, |
1067 | enum vm_event_item idx) |
1068 | { |
1069 | struct mem_cgroup *memcg = page_memcg(page); |
1070 | |
1071 | if (memcg) |
1072 | count_memcg_events(memcg, idx, 1); |
1073 | } |
1074 | |
1075 | static inline void count_memcg_folio_events(struct folio *folio, |
1076 | enum vm_event_item idx, unsigned long nr) |
1077 | { |
1078 | struct mem_cgroup *memcg = folio_memcg(folio); |
1079 | |
1080 | if (memcg) |
1081 | count_memcg_events(memcg, idx, nr); |
1082 | } |
1083 | |
1084 | static inline void count_memcg_event_mm(struct mm_struct *mm, |
1085 | enum vm_event_item idx) |
1086 | { |
1087 | struct mem_cgroup *memcg; |
1088 | |
1089 | if (mem_cgroup_disabled()) |
1090 | return; |
1091 | |
1092 | rcu_read_lock(); |
1093 | memcg = mem_cgroup_from_task(rcu_dereference(mm->owner)); |
1094 | if (likely(memcg)) |
1095 | count_memcg_events(memcg, idx, 1); |
1096 | rcu_read_unlock(); |
1097 | } |
1098 | |
1099 | static inline void memcg_memory_event(struct mem_cgroup *memcg, |
1100 | enum memcg_memory_event event) |
1101 | { |
1102 | bool swap_event = event == MEMCG_SWAP_HIGH || event == MEMCG_SWAP_MAX || |
1103 | event == MEMCG_SWAP_FAIL; |
1104 | |
1105 | atomic_long_inc(&memcg->memory_events_local[event]); |
1106 | if (!swap_event) |
1107 | cgroup_file_notify(&memcg->events_local_file); |
1108 | |
1109 | do { |
1110 | atomic_long_inc(&memcg->memory_events[event]); |
1111 | if (swap_event) |
1112 | cgroup_file_notify(&memcg->swap_events_file); |
1113 | else |
1114 | cgroup_file_notify(&memcg->events_file); |
1115 | |
1116 | if (!cgroup_subsys_on_dfl(memory_cgrp_subsys)) |
1117 | break; |
1118 | if (cgrp_dfl_root.flags & CGRP_ROOT_MEMORY_LOCAL_EVENTS) |
1119 | break; |
1120 | } while ((memcg = parent_mem_cgroup(memcg)) && |
1121 | !mem_cgroup_is_root(memcg)); |
1122 | } |
1123 | |
1124 | static inline void memcg_memory_event_mm(struct mm_struct *mm, |
1125 | enum memcg_memory_event event) |
1126 | { |
1127 | struct mem_cgroup *memcg; |
1128 | |
1129 | if (mem_cgroup_disabled()) |
1130 | return; |
1131 | |
1132 | rcu_read_lock(); |
1133 | memcg = mem_cgroup_from_task(rcu_dereference(mm->owner)); |
1134 | if (likely(memcg)) |
1135 | memcg_memory_event(memcg, event); |
1136 | rcu_read_unlock(); |
1137 | } |
1138 | |
1139 | void split_page_memcg(struct page *head, unsigned int nr); |
1140 | |
1141 | unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t *pgdat, int order, |
1142 | gfp_t gfp_mask, |
1143 | unsigned long *total_scanned); |
1144 | |
1145 | #else /* CONFIG_MEMCG */ |
1146 | |
1147 | #define MEM_CGROUP_ID_SHIFT 0 |
1148 | #define MEM_CGROUP_ID_MAX 0 |
1149 | |
1150 | static inline struct mem_cgroup *folio_memcg(struct folio *folio) |
1151 | { |
1152 | return NULL; |
1153 | } |
1154 | |
1155 | static inline struct mem_cgroup *page_memcg(struct page *page) |
1156 | { |
1157 | return NULL; |
1158 | } |
1159 | |
1160 | static inline struct mem_cgroup *folio_memcg_rcu(struct folio *folio) |
1161 | { |
1162 | WARN_ON_ONCE(!rcu_read_lock_held()); |
1163 | return NULL; |
1164 | } |
1165 | |
1166 | static inline struct mem_cgroup *page_memcg_check(struct page *page) |
1167 | { |
1168 | return NULL; |
1169 | } |
1170 | |
1171 | static inline bool folio_memcg_kmem(struct folio *folio) |
1172 | { |
1173 | return false; |
1174 | } |
1175 | |
1176 | static inline bool PageMemcgKmem(struct page *page) |
1177 | { |
1178 | return false; |
1179 | } |
1180 | |
1181 | static inline bool mem_cgroup_is_root(struct mem_cgroup *memcg) |
1182 | { |
1183 | return true; |
1184 | } |
1185 | |
1186 | static inline bool mem_cgroup_disabled(void) |
1187 | { |
1188 | return true; |
1189 | } |
1190 | |
1191 | static inline void memcg_memory_event(struct mem_cgroup *memcg, |
1192 | enum memcg_memory_event event) |
1193 | { |
1194 | } |
1195 | |
1196 | static inline void memcg_memory_event_mm(struct mm_struct *mm, |
1197 | enum memcg_memory_event event) |
1198 | { |
1199 | } |
1200 | |
1201 | static inline void mem_cgroup_protection(struct mem_cgroup *root, |
1202 | struct mem_cgroup *memcg, |
1203 | unsigned long *min, |
1204 | unsigned long *low) |
1205 | { |
1206 | *min = *low = 0; |
1207 | } |
1208 | |
1209 | static inline void mem_cgroup_calculate_protection(struct mem_cgroup *root, |
1210 | struct mem_cgroup *memcg) |
1211 | { |
1212 | } |
1213 | |
1214 | static inline bool mem_cgroup_below_low(struct mem_cgroup *memcg) |
1215 | { |
1216 | return false; |
1217 | } |
1218 | |
1219 | static inline bool mem_cgroup_below_min(struct mem_cgroup *memcg) |
1220 | { |
1221 | return false; |
1222 | } |
1223 | |
1224 | static inline int mem_cgroup_charge(struct folio *folio, |
1225 | struct mm_struct *mm, gfp_t gfp) |
1226 | { |
1227 | return 0; |
1228 | } |
1229 | |
1230 | static inline int mem_cgroup_swapin_charge_page(struct page *page, |
1231 | struct mm_struct *mm, gfp_t gfp, swp_entry_t entry) |
1232 | { |
1233 | return 0; |
1234 | } |
1235 | |
1236 | static inline void mem_cgroup_swapin_uncharge_swap(swp_entry_t entry) |
1237 | { |
1238 | } |
1239 | |
1240 | static inline void mem_cgroup_uncharge(struct folio *folio) |
1241 | { |
1242 | } |
1243 | |
1244 | static inline void mem_cgroup_uncharge_list(struct list_head *page_list) |
1245 | { |
1246 | } |
1247 | |
1248 | static inline void mem_cgroup_migrate(struct folio *old, struct folio *new) |
1249 | { |
1250 | } |
1251 | |
1252 | static inline struct lruvec *mem_cgroup_lruvec(struct mem_cgroup *memcg, |
1253 | struct pglist_data *pgdat) |
1254 | { |
1255 | return &pgdat->__lruvec; |
1256 | } |
1257 | |
1258 | static inline struct lruvec *folio_lruvec(struct folio *folio) |
1259 | { |
1260 | struct pglist_data *pgdat = folio_pgdat(folio); |
1261 | return &pgdat->__lruvec; |
1262 | } |
1263 | |
1264 | static inline |
1265 | void lruvec_memcg_debug(struct lruvec *lruvec, struct folio *folio) |
1266 | { |
1267 | } |
1268 | |
1269 | static inline struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg) |
1270 | { |
1271 | return NULL; |
1272 | } |
1273 | |
1274 | static inline bool mm_match_cgroup(struct mm_struct *mm, |
1275 | struct mem_cgroup *memcg) |
1276 | { |
1277 | return true; |
1278 | } |
1279 | |
1280 | static inline struct mem_cgroup *get_mem_cgroup_from_mm(struct mm_struct *mm) |
1281 | { |
1282 | return NULL; |
1283 | } |
1284 | |
1285 | static inline |
1286 | struct mem_cgroup *mem_cgroup_from_css(struct cgroup_subsys_state *css) |
1287 | { |
1288 | return NULL; |
1289 | } |
1290 | |
1291 | static inline void obj_cgroup_put(struct obj_cgroup *objcg) |
1292 | { |
1293 | } |
1294 | |
1295 | static inline void mem_cgroup_put(struct mem_cgroup *memcg) |
1296 | { |
1297 | } |
1298 | |
1299 | static inline struct lruvec *folio_lruvec_lock(struct folio *folio) |
1300 | { |
1301 | struct pglist_data *pgdat = folio_pgdat(folio); |
1302 | |
1303 | spin_lock(&pgdat->__lruvec.lru_lock); |
1304 | return &pgdat->__lruvec; |
1305 | } |
1306 | |
1307 | static inline struct lruvec *folio_lruvec_lock_irq(struct folio *folio) |
1308 | { |
1309 | struct pglist_data *pgdat = folio_pgdat(folio); |
1310 | |
1311 | spin_lock_irq(&pgdat->__lruvec.lru_lock); |
1312 | return &pgdat->__lruvec; |
1313 | } |
1314 | |
1315 | static inline struct lruvec *folio_lruvec_lock_irqsave(struct folio *folio, |
1316 | unsigned long *flagsp) |
1317 | { |
1318 | struct pglist_data *pgdat = folio_pgdat(folio); |
1319 | |
1320 | spin_lock_irqsave(&pgdat->__lruvec.lru_lock, *flagsp); |
1321 | return &pgdat->__lruvec; |
1322 | } |
1323 | |
1324 | static inline struct mem_cgroup * |
1325 | mem_cgroup_iter(struct mem_cgroup *root, |
1326 | struct mem_cgroup *prev, |
1327 | struct mem_cgroup_reclaim_cookie *reclaim) |
1328 | { |
1329 | return NULL; |
1330 | } |
1331 | |
1332 | static inline void mem_cgroup_iter_break(struct mem_cgroup *root, |
1333 | struct mem_cgroup *prev) |
1334 | { |
1335 | } |
1336 | |
1337 | static inline int mem_cgroup_scan_tasks(struct mem_cgroup *memcg, |
1338 | int (*fn)(struct task_struct *, void *), void *arg) |
1339 | { |
1340 | return 0; |
1341 | } |
1342 | |
1343 | static inline unsigned short mem_cgroup_id(struct mem_cgroup *memcg) |
1344 | { |
1345 | return 0; |
1346 | } |
1347 | |
1348 | static inline struct mem_cgroup *mem_cgroup_from_id(unsigned short id) |
1349 | { |
1350 | WARN_ON_ONCE(id); |
1351 | /* XXX: This should always return root_mem_cgroup */ |
1352 | return NULL; |
1353 | } |
1354 | |
1355 | #ifdef CONFIG_SHRINKER_DEBUG |
1356 | static inline unsigned long mem_cgroup_ino(struct mem_cgroup *memcg) |
1357 | { |
1358 | return 0; |
1359 | } |
1360 | |
1361 | static inline struct mem_cgroup *mem_cgroup_get_from_ino(unsigned long ino) |
1362 | { |
1363 | return NULL; |
1364 | } |
1365 | #endif |
1366 | |
1367 | static inline struct mem_cgroup *mem_cgroup_from_seq(struct seq_file *m) |
1368 | { |
1369 | return NULL; |
1370 | } |
1371 | |
1372 | static inline struct mem_cgroup *lruvec_memcg(struct lruvec *lruvec) |
1373 | { |
1374 | return NULL; |
1375 | } |
1376 | |
1377 | static inline bool mem_cgroup_online(struct mem_cgroup *memcg) |
1378 | { |
1379 | return true; |
1380 | } |
1381 | |
1382 | static inline |
1383 | unsigned long mem_cgroup_get_zone_lru_size(struct lruvec *lruvec, |
1384 | enum lru_list lru, int zone_idx) |
1385 | { |
1386 | return 0; |
1387 | } |
1388 | |
1389 | static inline unsigned long mem_cgroup_get_max(struct mem_cgroup *memcg) |
1390 | { |
1391 | return 0; |
1392 | } |
1393 | |
1394 | static inline unsigned long mem_cgroup_size(struct mem_cgroup *memcg) |
1395 | { |
1396 | return 0; |
1397 | } |
1398 | |
1399 | static inline void |
1400 | mem_cgroup_print_oom_context(struct mem_cgroup *memcg, struct task_struct *p) |
1401 | { |
1402 | } |
1403 | |
1404 | static inline void |
1405 | mem_cgroup_print_oom_meminfo(struct mem_cgroup *memcg) |
1406 | { |
1407 | } |
1408 | |
1409 | static inline void lock_page_memcg(struct page *page) |
1410 | { |
1411 | } |
1412 | |
1413 | static inline void unlock_page_memcg(struct page *page) |
1414 | { |
1415 | } |
1416 | |
1417 | static inline void folio_memcg_lock(struct folio *folio) |
1418 | { |
1419 | } |
1420 | |
1421 | static inline void folio_memcg_unlock(struct folio *folio) |
1422 | { |
1423 | } |
1424 | |
1425 | static inline void mem_cgroup_handle_over_high(void) |
1426 | { |
1427 | } |
1428 | |
1429 | static inline void mem_cgroup_enter_user_fault(void) |
1430 | { |
1431 | } |
1432 | |
1433 | static inline void mem_cgroup_exit_user_fault(void) |
1434 | { |
1435 | } |
1436 | |
1437 | static inline bool task_in_memcg_oom(struct task_struct *p) |
1438 | { |
1439 | return false; |
1440 | } |
1441 | |
1442 | static inline bool mem_cgroup_oom_synchronize(bool wait) |
1443 | { |
1444 | return false; |
1445 | } |
1446 | |
1447 | static inline struct mem_cgroup *mem_cgroup_get_oom_group( |
1448 | struct task_struct *victim, struct mem_cgroup *oom_domain) |
1449 | { |
1450 | return NULL; |
1451 | } |
1452 | |
1453 | static inline void mem_cgroup_print_oom_group(struct mem_cgroup *memcg) |
1454 | { |
1455 | } |
1456 | |
1457 | static inline void __mod_memcg_state(struct mem_cgroup *memcg, |
1458 | int idx, |
1459 | int nr) |
1460 | { |
1461 | } |
1462 | |
1463 | static inline void mod_memcg_state(struct mem_cgroup *memcg, |
1464 | int idx, |
1465 | int nr) |
1466 | { |
1467 | } |
1468 | |
1469 | static inline void mod_memcg_page_state(struct page *page, |
1470 | int idx, int val) |
1471 | { |
1472 | } |
1473 | |
1474 | static inline unsigned long memcg_page_state(struct mem_cgroup *memcg, int idx) |
1475 | { |
1476 | return 0; |
1477 | } |
1478 | |
1479 | static inline unsigned long lruvec_page_state(struct lruvec *lruvec, |
1480 | enum node_stat_item idx) |
1481 | { |
1482 | return node_page_state(lruvec_pgdat(lruvec), idx); |
1483 | } |
1484 | |
1485 | static inline unsigned long lruvec_page_state_local(struct lruvec *lruvec, |
1486 | enum node_stat_item idx) |
1487 | { |
1488 | return node_page_state(lruvec_pgdat(lruvec), idx); |
1489 | } |
1490 | |
1491 | static inline void mem_cgroup_flush_stats(void) |
1492 | { |
1493 | } |
1494 | |
1495 | static inline void mem_cgroup_flush_stats_delayed(void) |
1496 | { |
1497 | } |
1498 | |
1499 | static inline void __mod_memcg_lruvec_state(struct lruvec *lruvec, |
1500 | enum node_stat_item idx, int val) |
1501 | { |
1502 | } |
1503 | |
1504 | static inline void __mod_lruvec_kmem_state(void *p, enum node_stat_item idx, |
1505 | int val) |
1506 | { |
1507 | struct page *page = virt_to_head_page(p); |
1508 | |
1509 | __mod_node_page_state(page_pgdat(page), idx, val); |
1510 | } |
1511 | |
1512 | static inline void mod_lruvec_kmem_state(void *p, enum node_stat_item idx, |
1513 | int val) |
1514 | { |
1515 | struct page *page = virt_to_head_page(p); |
1516 | |
1517 | mod_node_page_state(page_pgdat(page), idx, val); |
1518 | } |
1519 | |
1520 | static inline void count_memcg_events(struct mem_cgroup *memcg, |
1521 | enum vm_event_item idx, |
1522 | unsigned long count) |
1523 | { |
1524 | } |
1525 | |
1526 | static inline void __count_memcg_events(struct mem_cgroup *memcg, |
1527 | enum vm_event_item idx, |
1528 | unsigned long count) |
1529 | { |
1530 | } |
1531 | |
1532 | static inline void count_memcg_page_event(struct page *page, |
1533 | int idx) |
1534 | { |
1535 | } |
1536 | |
1537 | static inline void count_memcg_folio_events(struct folio *folio, |
1538 | enum vm_event_item idx, unsigned long nr) |
1539 | { |
1540 | } |
1541 | |
1542 | static inline |
1543 | void count_memcg_event_mm(struct mm_struct *mm, enum vm_event_item idx) |
1544 | { |
1545 | } |
1546 | |
1547 | static inline void split_page_memcg(struct page *head, unsigned int nr) |
1548 | { |
1549 | } |
1550 | |
1551 | static inline |
1552 | unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t *pgdat, int order, |
1553 | gfp_t gfp_mask, |
1554 | unsigned long *total_scanned) |
1555 | { |
1556 | return 0; |
1557 | } |
1558 | #endif /* CONFIG_MEMCG */ |
1559 | |
1560 | static inline void __inc_lruvec_kmem_state(void *p, enum node_stat_item idx) |
1561 | { |
1562 | __mod_lruvec_kmem_state(p, idx, 1); |
1563 | } |
1564 | |
1565 | static inline void __dec_lruvec_kmem_state(void *p, enum node_stat_item idx) |
1566 | { |
1567 | __mod_lruvec_kmem_state(p, idx, -1); |
1568 | } |
1569 | |
1570 | static inline struct lruvec *parent_lruvec(struct lruvec *lruvec) |
1571 | { |
1572 | struct mem_cgroup *memcg; |
1573 | |
1574 | memcg = lruvec_memcg(lruvec); |
1575 | if (!memcg) |
1576 | return NULL; |
1577 | memcg = parent_mem_cgroup(memcg); |
1578 | if (!memcg) |
1579 | return NULL; |
1580 | return mem_cgroup_lruvec(memcg, lruvec_pgdat(lruvec)); |
1581 | } |
1582 | |
1583 | static inline void unlock_page_lruvec(struct lruvec *lruvec) |
1584 | { |
1585 | spin_unlock(&lruvec->lru_lock); |
1586 | } |
1587 | |
1588 | static inline void unlock_page_lruvec_irq(struct lruvec *lruvec) |
1589 | { |
1590 | spin_unlock_irq(&lruvec->lru_lock); |
1591 | } |
1592 | |
1593 | static inline void unlock_page_lruvec_irqrestore(struct lruvec *lruvec, |
1594 | unsigned long flags) |
1595 | { |
1596 | spin_unlock_irqrestore(&lruvec->lru_lock, flags); |
1597 | } |
1598 | |
1599 | /* Test requires a stable page->memcg binding, see page_memcg() */ |
1600 | static inline bool folio_matches_lruvec(struct folio *folio, |
1601 | struct lruvec *lruvec) |
1602 | { |
1603 | return lruvec_pgdat(lruvec) == folio_pgdat(folio) && |
1604 | lruvec_memcg(lruvec) == folio_memcg(folio); |
1605 | } |
1606 | |
1607 | /* Don't lock again iff page's lruvec locked */ |
1608 | static inline struct lruvec *folio_lruvec_relock_irq(struct folio *folio, |
1609 | struct lruvec *locked_lruvec) |
1610 | { |
1611 | if (locked_lruvec) { |
1612 | if (folio_matches_lruvec(folio, locked_lruvec)) |
1613 | return locked_lruvec; |
1614 | |
1615 | unlock_page_lruvec_irq(locked_lruvec); |
1616 | } |
1617 | |
1618 | return folio_lruvec_lock_irq(folio); |
1619 | } |
1620 | |
1621 | /* Don't lock again iff page's lruvec locked */ |
1622 | static inline struct lruvec *folio_lruvec_relock_irqsave(struct folio *folio, |
1623 | struct lruvec *locked_lruvec, unsigned long *flags) |
1624 | { |
1625 | if (locked_lruvec) { |
1626 | if (folio_matches_lruvec(folio, locked_lruvec)) |
1627 | return locked_lruvec; |
1628 | |
1629 | unlock_page_lruvec_irqrestore(locked_lruvec, *flags); |
1630 | } |
1631 | |
1632 | return folio_lruvec_lock_irqsave(folio, flags); |
1633 | } |
1634 | |
1635 | #ifdef CONFIG_CGROUP_WRITEBACK |
1636 | |
1637 | struct wb_domain *mem_cgroup_wb_domain(struct bdi_writeback *wb); |
1638 | void mem_cgroup_wb_stats(struct bdi_writeback *wb, unsigned long *pfilepages, |
1639 | unsigned long *pheadroom, unsigned long *pdirty, |
1640 | unsigned long *pwriteback); |
1641 | |
1642 | void mem_cgroup_track_foreign_dirty_slowpath(struct folio *folio, |
1643 | struct bdi_writeback *wb); |
1644 | |
1645 | static inline void mem_cgroup_track_foreign_dirty(struct folio *folio, |
1646 | struct bdi_writeback *wb) |
1647 | { |
1648 | if (mem_cgroup_disabled()) |
1649 | return; |
1650 | |
1651 | if (unlikely(&folio_memcg(folio)->css != wb->memcg_css)) |
1652 | mem_cgroup_track_foreign_dirty_slowpath(folio, wb); |
1653 | } |
1654 | |
1655 | void mem_cgroup_flush_foreign(struct bdi_writeback *wb); |
1656 | |
1657 | #else /* CONFIG_CGROUP_WRITEBACK */ |
1658 | |
1659 | static inline struct wb_domain *mem_cgroup_wb_domain(struct bdi_writeback *wb) |
1660 | { |
1661 | return NULL; |
1662 | } |
1663 | |
1664 | static inline void mem_cgroup_wb_stats(struct bdi_writeback *wb, |
1665 | unsigned long *pfilepages, |
1666 | unsigned long *pheadroom, |
1667 | unsigned long *pdirty, |
1668 | unsigned long *pwriteback) |
1669 | { |
1670 | } |
1671 | |
1672 | static inline void mem_cgroup_track_foreign_dirty(struct folio *folio, |
1673 | struct bdi_writeback *wb) |
1674 | { |
1675 | } |
1676 | |
1677 | static inline void mem_cgroup_flush_foreign(struct bdi_writeback *wb) |
1678 | { |
1679 | } |
1680 | |
1681 | #endif /* CONFIG_CGROUP_WRITEBACK */ |
1682 | |
1683 | struct sock; |
1684 | bool mem_cgroup_charge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages, |
1685 | gfp_t gfp_mask); |
1686 | void mem_cgroup_uncharge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages); |
1687 | #ifdef CONFIG_MEMCG |
1688 | extern struct static_key_false memcg_sockets_enabled_key; |
1689 | #define mem_cgroup_sockets_enabled static_branch_unlikely(&memcg_sockets_enabled_key) |
1690 | void mem_cgroup_sk_alloc(struct sock *sk); |
1691 | void mem_cgroup_sk_free(struct sock *sk); |
1692 | static inline bool mem_cgroup_under_socket_pressure(struct mem_cgroup *memcg) |
1693 | { |
1694 | if (!cgroup_subsys_on_dfl(memory_cgrp_subsys) && memcg->tcpmem_pressure) |
1695 | return true; |
1696 | do { |
1697 | if (time_before(jiffies, READ_ONCE(memcg->socket_pressure))) |
1698 | return true; |
1699 | } while ((memcg = parent_mem_cgroup(memcg))); |
1700 | return false; |
1701 | } |
1702 | |
1703 | int alloc_shrinker_info(struct mem_cgroup *memcg); |
1704 | void free_shrinker_info(struct mem_cgroup *memcg); |
1705 | void set_shrinker_bit(struct mem_cgroup *memcg, int nid, int shrinker_id); |
1706 | void reparent_shrinker_deferred(struct mem_cgroup *memcg); |
1707 | #else |
1708 | #define mem_cgroup_sockets_enabled 0 |
1709 | static inline void mem_cgroup_sk_alloc(struct sock *sk) { }; |
1710 | static inline void mem_cgroup_sk_free(struct sock *sk) { }; |
1711 | static inline bool mem_cgroup_under_socket_pressure(struct mem_cgroup *memcg) |
1712 | { |
1713 | return false; |
1714 | } |
1715 | |
1716 | static inline void set_shrinker_bit(struct mem_cgroup *memcg, |
1717 | int nid, int shrinker_id) |
1718 | { |
1719 | } |
1720 | #endif |
1721 | |
1722 | #ifdef CONFIG_MEMCG_KMEM |
1723 | bool mem_cgroup_kmem_disabled(void); |
1724 | int __memcg_kmem_charge_page(struct page *page, gfp_t gfp, int order); |
1725 | void __memcg_kmem_uncharge_page(struct page *page, int order); |
1726 | |
1727 | struct obj_cgroup *get_obj_cgroup_from_current(void); |
1728 | struct obj_cgroup *get_obj_cgroup_from_page(struct page *page); |
1729 | |
1730 | int obj_cgroup_charge(struct obj_cgroup *objcg, gfp_t gfp, size_t size); |
1731 | void obj_cgroup_uncharge(struct obj_cgroup *objcg, size_t size); |
1732 | |
1733 | extern struct static_key_false memcg_kmem_enabled_key; |
1734 | |
1735 | static inline bool memcg_kmem_enabled(void) |
1736 | { |
1737 | return static_branch_likely(&memcg_kmem_enabled_key); |
1738 | } |
1739 | |
1740 | static inline int memcg_kmem_charge_page(struct page *page, gfp_t gfp, |
1741 | int order) |
1742 | { |
1743 | if (memcg_kmem_enabled()) |
1744 | return __memcg_kmem_charge_page(page, gfp, order); |
1745 | return 0; |
1746 | } |
1747 | |
1748 | static inline void memcg_kmem_uncharge_page(struct page *page, int order) |
1749 | { |
1750 | if (memcg_kmem_enabled()) |
1751 | __memcg_kmem_uncharge_page(page, order); |
1752 | } |
1753 | |
1754 | /* |
1755 | * A helper for accessing memcg's kmem_id, used for getting |
1756 | * corresponding LRU lists. |
1757 | */ |
1758 | static inline int memcg_kmem_id(struct mem_cgroup *memcg) |
1759 | { |
1760 | return memcg ? memcg->kmemcg_id : -1; |
1761 | } |
1762 | |
1763 | struct mem_cgroup *mem_cgroup_from_obj(void *p); |
1764 | struct mem_cgroup *mem_cgroup_from_slab_obj(void *p); |
1765 | |
1766 | static inline void count_objcg_event(struct obj_cgroup *objcg, |
1767 | enum vm_event_item idx) |
1768 | { |
1769 | struct mem_cgroup *memcg; |
1770 | |
1771 | if (mem_cgroup_kmem_disabled()) |
1772 | return; |
1773 | |
1774 | rcu_read_lock(); |
1775 | memcg = obj_cgroup_memcg(objcg); |
1776 | count_memcg_events(memcg, idx, 1); |
1777 | rcu_read_unlock(); |
1778 | } |
1779 | |
1780 | /** |
1781 | * get_mem_cgroup_from_obj - get a memcg associated with passed kernel object. |
1782 | * @p: pointer to object from which memcg should be extracted. It can be NULL. |
1783 | * |
1784 | * Retrieves the memory group into which the memory of the pointed kernel |
1785 | * object is accounted. If memcg is found, its reference is taken. |
1786 | * If a passed kernel object is uncharged, or if proper memcg cannot be found, |
1787 | * as well as if mem_cgroup is disabled, NULL is returned. |
1788 | * |
1789 | * Return: valid memcg pointer with taken reference or NULL. |
1790 | */ |
1791 | static inline struct mem_cgroup *get_mem_cgroup_from_obj(void *p) |
1792 | { |
1793 | struct mem_cgroup *memcg; |
1794 | |
1795 | rcu_read_lock(); |
1796 | do { |
1797 | memcg = mem_cgroup_from_obj(p); |
1798 | } while (memcg && !css_tryget(&memcg->css)); |
1799 | rcu_read_unlock(); |
1800 | return memcg; |
1801 | } |
1802 | |
1803 | /** |
1804 | * mem_cgroup_or_root - always returns a pointer to a valid memory cgroup. |
1805 | * @memcg: pointer to a valid memory cgroup or NULL. |
1806 | * |
1807 | * If passed argument is not NULL, returns it without any additional checks |
1808 | * and changes. Otherwise, root_mem_cgroup is returned. |
1809 | * |
1810 | * NOTE: root_mem_cgroup can be NULL during early boot. |
1811 | */ |
1812 | static inline struct mem_cgroup *mem_cgroup_or_root(struct mem_cgroup *memcg) |
1813 | { |
1814 | return memcg ? memcg : root_mem_cgroup; |
1815 | } |
1816 | #else |
1817 | static inline bool mem_cgroup_kmem_disabled(void) |
1818 | { |
1819 | return true; |
1820 | } |
1821 | |
1822 | static inline int memcg_kmem_charge_page(struct page *page, gfp_t gfp, |
1823 | int order) |
1824 | { |
1825 | return 0; |
1826 | } |
1827 | |
1828 | static inline void memcg_kmem_uncharge_page(struct page *page, int order) |
1829 | { |
1830 | } |
1831 | |
1832 | static inline int __memcg_kmem_charge_page(struct page *page, gfp_t gfp, |
1833 | int order) |
1834 | { |
1835 | return 0; |
1836 | } |
1837 | |
1838 | static inline void __memcg_kmem_uncharge_page(struct page *page, int order) |
1839 | { |
1840 | } |
1841 | |
1842 | static inline struct obj_cgroup *get_obj_cgroup_from_page(struct page *page) |
1843 | { |
1844 | return NULL; |
1845 | } |
1846 | |
1847 | static inline bool memcg_kmem_enabled(void) |
1848 | { |
1849 | return false; |
1850 | } |
1851 | |
1852 | static inline int memcg_kmem_id(struct mem_cgroup *memcg) |
1853 | { |
1854 | return -1; |
1855 | } |
1856 | |
1857 | static inline struct mem_cgroup *mem_cgroup_from_obj(void *p) |
1858 | { |
1859 | return NULL; |
1860 | } |
1861 | |
1862 | static inline struct mem_cgroup *mem_cgroup_from_slab_obj(void *p) |
1863 | { |
1864 | return NULL; |
1865 | } |
1866 | |
1867 | static inline void count_objcg_event(struct obj_cgroup *objcg, |
1868 | enum vm_event_item idx) |
1869 | { |
1870 | } |
1871 | |
1872 | static inline struct mem_cgroup *get_mem_cgroup_from_obj(void *p) |
1873 | { |
1874 | return NULL; |
1875 | } |
1876 | |
1877 | static inline struct mem_cgroup *mem_cgroup_or_root(struct mem_cgroup *memcg) |
1878 | { |
1879 | return NULL; |
1880 | } |
1881 | #endif /* CONFIG_MEMCG_KMEM */ |
1882 | |
1883 | #if defined(CONFIG_MEMCG_KMEM) && defined(CONFIG_ZSWAP) |
1884 | bool obj_cgroup_may_zswap(struct obj_cgroup *objcg); |
1885 | void obj_cgroup_charge_zswap(struct obj_cgroup *objcg, size_t size); |
1886 | void obj_cgroup_uncharge_zswap(struct obj_cgroup *objcg, size_t size); |
1887 | #else |
1888 | static inline bool obj_cgroup_may_zswap(struct obj_cgroup *objcg) |
1889 | { |
1890 | return true; |
1891 | } |
1892 | static inline void obj_cgroup_charge_zswap(struct obj_cgroup *objcg, |
1893 | size_t size) |
1894 | { |
1895 | } |
1896 | static inline void obj_cgroup_uncharge_zswap(struct obj_cgroup *objcg, |
1897 | size_t size) |
1898 | { |
1899 | } |
1900 | #endif |
1901 | |
1902 | #endif /* _LINUX_MEMCONTROL_H */ |
1903 | |