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/kernel.h> |
18 | #include <linux/page_counter.h> |
19 | #include <linux/vmpressure.h> |
20 | #include <linux/eventfd.h> |
21 | #include <linux/mm.h> |
22 | #include <linux/vmstat.h> |
23 | #include <linux/writeback.h> |
24 | #include <linux/page-flags.h> |
25 | #include <linux/shrinker.h> |
26 | |
27 | struct mem_cgroup; |
28 | struct obj_cgroup; |
29 | struct page; |
30 | struct mm_struct; |
31 | struct kmem_cache; |
32 | |
33 | /* Cgroup-specific page state, on top of universal node page state */ |
34 | enum memcg_stat_item { |
35 | MEMCG_SWAP = NR_VM_NODE_STAT_ITEMS, |
36 | MEMCG_SOCK, |
37 | MEMCG_PERCPU_B, |
38 | MEMCG_VMALLOC, |
39 | MEMCG_KMEM, |
40 | MEMCG_ZSWAP_B, |
41 | MEMCG_ZSWAPPED, |
42 | MEMCG_NR_STAT, |
43 | }; |
44 | |
45 | enum memcg_memory_event { |
46 | MEMCG_LOW, |
47 | MEMCG_HIGH, |
48 | MEMCG_MAX, |
49 | MEMCG_OOM, |
50 | MEMCG_OOM_KILL, |
51 | MEMCG_OOM_GROUP_KILL, |
52 | MEMCG_SWAP_HIGH, |
53 | MEMCG_SWAP_MAX, |
54 | MEMCG_SWAP_FAIL, |
55 | MEMCG_NR_MEMORY_EVENTS, |
56 | }; |
57 | |
58 | struct mem_cgroup_reclaim_cookie { |
59 | pg_data_t *pgdat; |
60 | unsigned int generation; |
61 | }; |
62 | |
63 | #ifdef CONFIG_MEMCG |
64 | |
65 | #define MEM_CGROUP_ID_SHIFT 16 |
66 | |
67 | struct mem_cgroup_id { |
68 | int id; |
69 | refcount_t ref; |
70 | }; |
71 | |
72 | /* |
73 | * Per memcg event counter is incremented at every pagein/pageout. With THP, |
74 | * it will be incremented by the number of pages. This counter is used |
75 | * to trigger some periodic events. This is straightforward and better |
76 | * than using jiffies etc. to handle periodic memcg event. |
77 | */ |
78 | enum mem_cgroup_events_target { |
79 | MEM_CGROUP_TARGET_THRESH, |
80 | MEM_CGROUP_TARGET_SOFTLIMIT, |
81 | MEM_CGROUP_NTARGETS, |
82 | }; |
83 | |
84 | struct memcg_vmstats_percpu; |
85 | struct memcg_vmstats; |
86 | |
87 | struct mem_cgroup_reclaim_iter { |
88 | struct mem_cgroup *position; |
89 | /* scan generation, increased every round-trip */ |
90 | unsigned int generation; |
91 | }; |
92 | |
93 | struct lruvec_stats_percpu { |
94 | /* Local (CPU and cgroup) state */ |
95 | long state[NR_VM_NODE_STAT_ITEMS]; |
96 | |
97 | /* Delta calculation for lockless upward propagation */ |
98 | long state_prev[NR_VM_NODE_STAT_ITEMS]; |
99 | }; |
100 | |
101 | struct lruvec_stats { |
102 | /* Aggregated (CPU and subtree) state */ |
103 | long state[NR_VM_NODE_STAT_ITEMS]; |
104 | |
105 | /* Non-hierarchical (CPU aggregated) state */ |
106 | long state_local[NR_VM_NODE_STAT_ITEMS]; |
107 | |
108 | /* Pending child counts during tree propagation */ |
109 | long state_pending[NR_VM_NODE_STAT_ITEMS]; |
110 | }; |
111 | |
112 | /* |
113 | * per-node information in memory controller. |
114 | */ |
115 | struct mem_cgroup_per_node { |
116 | struct lruvec lruvec; |
117 | |
118 | struct lruvec_stats_percpu __percpu *lruvec_stats_percpu; |
119 | struct lruvec_stats lruvec_stats; |
120 | |
121 | unsigned long lru_zone_size[MAX_NR_ZONES][NR_LRU_LISTS]; |
122 | |
123 | struct mem_cgroup_reclaim_iter iter; |
124 | |
125 | struct shrinker_info __rcu *shrinker_info; |
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_threshold { |
136 | struct eventfd_ctx *eventfd; |
137 | unsigned long threshold; |
138 | }; |
139 | |
140 | /* For threshold */ |
141 | struct mem_cgroup_threshold_ary { |
142 | /* An array index points to threshold just below or equal to usage. */ |
143 | int current_threshold; |
144 | /* Size of entries[] */ |
145 | unsigned int size; |
146 | /* Array of thresholds */ |
147 | struct mem_cgroup_threshold entries[] __counted_by(size); |
148 | }; |
149 | |
150 | struct mem_cgroup_thresholds { |
151 | /* Primary thresholds array */ |
152 | struct mem_cgroup_threshold_ary *primary; |
153 | /* |
154 | * Spare threshold array. |
155 | * This is needed to make mem_cgroup_unregister_event() "never fail". |
156 | * It must be able to store at least primary->size - 1 entries. |
157 | */ |
158 | struct mem_cgroup_threshold_ary *spare; |
159 | }; |
160 | |
161 | /* |
162 | * Remember four most recent foreign writebacks with dirty pages in this |
163 | * cgroup. Inode sharing is expected to be uncommon and, even if we miss |
164 | * one in a given round, we're likely to catch it later if it keeps |
165 | * foreign-dirtying, so a fairly low count should be enough. |
166 | * |
167 | * See mem_cgroup_track_foreign_dirty_slowpath() for details. |
168 | */ |
169 | #define MEMCG_CGWB_FRN_CNT 4 |
170 | |
171 | struct memcg_cgwb_frn { |
172 | u64 bdi_id; /* bdi->id of the foreign inode */ |
173 | int memcg_id; /* memcg->css.id of foreign inode */ |
174 | u64 at; /* jiffies_64 at the time of dirtying */ |
175 | struct wb_completion done; /* tracks in-flight foreign writebacks */ |
176 | }; |
177 | |
178 | /* |
179 | * Bucket for arbitrarily byte-sized objects charged to a memory |
180 | * cgroup. The bucket can be reparented in one piece when the cgroup |
181 | * is destroyed, without having to round up the individual references |
182 | * of all live memory objects in the wild. |
183 | */ |
184 | struct obj_cgroup { |
185 | struct percpu_ref refcnt; |
186 | struct mem_cgroup *memcg; |
187 | atomic_t nr_charged_bytes; |
188 | union { |
189 | struct list_head list; /* protected by objcg_lock */ |
190 | struct rcu_head rcu; |
191 | }; |
192 | }; |
193 | |
194 | /* |
195 | * The memory controller data structure. The memory controller controls both |
196 | * page cache and RSS per cgroup. We would eventually like to provide |
197 | * statistics based on the statistics developed by Rik Van Riel for clock-pro, |
198 | * to help the administrator determine what knobs to tune. |
199 | */ |
200 | struct mem_cgroup { |
201 | struct cgroup_subsys_state css; |
202 | |
203 | /* Private memcg ID. Used to ID objects that outlive the cgroup */ |
204 | struct mem_cgroup_id id; |
205 | |
206 | /* Accounted resources */ |
207 | struct page_counter memory; /* Both v1 & v2 */ |
208 | |
209 | union { |
210 | struct page_counter swap; /* v2 only */ |
211 | struct page_counter memsw; /* v1 only */ |
212 | }; |
213 | |
214 | /* Legacy consumer-oriented counters */ |
215 | struct page_counter kmem; /* v1 only */ |
216 | struct page_counter tcpmem; /* v1 only */ |
217 | |
218 | /* Range enforcement for interrupt charges */ |
219 | struct work_struct high_work; |
220 | |
221 | #if defined(CONFIG_MEMCG_KMEM) && defined(CONFIG_ZSWAP) |
222 | unsigned long zswap_max; |
223 | |
224 | /* |
225 | * Prevent pages from this memcg from being written back from zswap to |
226 | * swap, and from being swapped out on zswap store failures. |
227 | */ |
228 | bool zswap_writeback; |
229 | #endif |
230 | |
231 | unsigned long soft_limit; |
232 | |
233 | /* vmpressure notifications */ |
234 | struct vmpressure vmpressure; |
235 | |
236 | /* |
237 | * Should the OOM killer kill all belonging tasks, had it kill one? |
238 | */ |
239 | bool oom_group; |
240 | |
241 | /* protected by memcg_oom_lock */ |
242 | bool oom_lock; |
243 | int under_oom; |
244 | |
245 | int swappiness; |
246 | /* OOM-Killer disable */ |
247 | int oom_kill_disable; |
248 | |
249 | /* memory.events and memory.events.local */ |
250 | struct cgroup_file events_file; |
251 | struct cgroup_file events_local_file; |
252 | |
253 | /* handle for "memory.swap.events" */ |
254 | struct cgroup_file swap_events_file; |
255 | |
256 | /* protect arrays of thresholds */ |
257 | struct mutex thresholds_lock; |
258 | |
259 | /* thresholds for memory usage. RCU-protected */ |
260 | struct mem_cgroup_thresholds thresholds; |
261 | |
262 | /* thresholds for mem+swap usage. RCU-protected */ |
263 | struct mem_cgroup_thresholds memsw_thresholds; |
264 | |
265 | /* For oom notifier event fd */ |
266 | struct list_head oom_notify; |
267 | |
268 | /* |
269 | * Should we move charges of a task when a task is moved into this |
270 | * mem_cgroup ? And what type of charges should we move ? |
271 | */ |
272 | unsigned long move_charge_at_immigrate; |
273 | /* taken only while moving_account > 0 */ |
274 | spinlock_t move_lock; |
275 | unsigned long move_lock_flags; |
276 | |
277 | CACHELINE_PADDING(_pad1_); |
278 | |
279 | /* memory.stat */ |
280 | struct memcg_vmstats *vmstats; |
281 | |
282 | /* memory.events */ |
283 | atomic_long_t memory_events[MEMCG_NR_MEMORY_EVENTS]; |
284 | atomic_long_t memory_events_local[MEMCG_NR_MEMORY_EVENTS]; |
285 | |
286 | /* |
287 | * Hint of reclaim pressure for socket memroy management. Note |
288 | * that this indicator should NOT be used in legacy cgroup mode |
289 | * where socket memory is accounted/charged separately. |
290 | */ |
291 | unsigned long socket_pressure; |
292 | |
293 | /* Legacy tcp memory accounting */ |
294 | bool tcpmem_active; |
295 | int tcpmem_pressure; |
296 | |
297 | #ifdef CONFIG_MEMCG_KMEM |
298 | int kmemcg_id; |
299 | /* |
300 | * memcg->objcg is wiped out as a part of the objcg repaprenting |
301 | * process. memcg->orig_objcg preserves a pointer (and a reference) |
302 | * to the original objcg until the end of live of memcg. |
303 | */ |
304 | struct obj_cgroup __rcu *objcg; |
305 | struct obj_cgroup *orig_objcg; |
306 | /* list of inherited objcgs, protected by objcg_lock */ |
307 | struct list_head objcg_list; |
308 | #endif |
309 | |
310 | CACHELINE_PADDING(_pad2_); |
311 | |
312 | /* |
313 | * set > 0 if pages under this cgroup are moving to other cgroup. |
314 | */ |
315 | atomic_t moving_account; |
316 | struct task_struct *move_lock_task; |
317 | |
318 | struct memcg_vmstats_percpu __percpu *vmstats_percpu; |
319 | |
320 | #ifdef CONFIG_CGROUP_WRITEBACK |
321 | struct list_head cgwb_list; |
322 | struct wb_domain cgwb_domain; |
323 | struct memcg_cgwb_frn cgwb_frn[MEMCG_CGWB_FRN_CNT]; |
324 | #endif |
325 | |
326 | /* List of events which userspace want to receive */ |
327 | struct list_head event_list; |
328 | spinlock_t event_list_lock; |
329 | |
330 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
331 | struct deferred_split deferred_split_queue; |
332 | #endif |
333 | |
334 | #ifdef CONFIG_LRU_GEN_WALKS_MMU |
335 | /* per-memcg mm_struct list */ |
336 | struct lru_gen_mm_list mm_list; |
337 | #endif |
338 | |
339 | struct mem_cgroup_per_node *nodeinfo[]; |
340 | }; |
341 | |
342 | /* |
343 | * size of first charge trial. |
344 | * TODO: maybe necessary to use big numbers in big irons or dynamic based of the |
345 | * workload. |
346 | */ |
347 | #define MEMCG_CHARGE_BATCH 64U |
348 | |
349 | extern struct mem_cgroup *root_mem_cgroup; |
350 | |
351 | enum page_memcg_data_flags { |
352 | /* page->memcg_data is a pointer to an objcgs vector */ |
353 | MEMCG_DATA_OBJCGS = (1UL << 0), |
354 | /* page has been accounted as a non-slab kernel page */ |
355 | MEMCG_DATA_KMEM = (1UL << 1), |
356 | /* the next bit after the last actual flag */ |
357 | __NR_MEMCG_DATA_FLAGS = (1UL << 2), |
358 | }; |
359 | |
360 | #define MEMCG_DATA_FLAGS_MASK (__NR_MEMCG_DATA_FLAGS - 1) |
361 | |
362 | static inline bool folio_memcg_kmem(struct folio *folio); |
363 | |
364 | /* |
365 | * After the initialization objcg->memcg is always pointing at |
366 | * a valid memcg, but can be atomically swapped to the parent memcg. |
367 | * |
368 | * The caller must ensure that the returned memcg won't be released: |
369 | * e.g. acquire the rcu_read_lock or css_set_lock. |
370 | */ |
371 | static inline struct mem_cgroup *obj_cgroup_memcg(struct obj_cgroup *objcg) |
372 | { |
373 | return READ_ONCE(objcg->memcg); |
374 | } |
375 | |
376 | /* |
377 | * __folio_memcg - Get the memory cgroup associated with a non-kmem folio |
378 | * @folio: Pointer to the folio. |
379 | * |
380 | * Returns a pointer to the memory cgroup associated with the folio, |
381 | * or NULL. This function assumes that the folio is known to have a |
382 | * proper memory cgroup pointer. It's not safe to call this function |
383 | * against some type of folios, e.g. slab folios or ex-slab folios or |
384 | * kmem folios. |
385 | */ |
386 | static inline struct mem_cgroup *__folio_memcg(struct folio *folio) |
387 | { |
388 | unsigned long memcg_data = folio->memcg_data; |
389 | |
390 | VM_BUG_ON_FOLIO(folio_test_slab(folio), folio); |
391 | VM_BUG_ON_FOLIO(memcg_data & MEMCG_DATA_OBJCGS, folio); |
392 | VM_BUG_ON_FOLIO(memcg_data & MEMCG_DATA_KMEM, folio); |
393 | |
394 | return (struct mem_cgroup *)(memcg_data & ~MEMCG_DATA_FLAGS_MASK); |
395 | } |
396 | |
397 | /* |
398 | * __folio_objcg - get the object cgroup associated with a kmem folio. |
399 | * @folio: Pointer to the folio. |
400 | * |
401 | * Returns a pointer to the object cgroup associated with the folio, |
402 | * or NULL. This function assumes that the folio is known to have a |
403 | * proper object cgroup pointer. It's not safe to call this function |
404 | * against some type of folios, e.g. slab folios or ex-slab folios or |
405 | * LRU folios. |
406 | */ |
407 | static inline struct obj_cgroup *__folio_objcg(struct folio *folio) |
408 | { |
409 | unsigned long memcg_data = folio->memcg_data; |
410 | |
411 | VM_BUG_ON_FOLIO(folio_test_slab(folio), folio); |
412 | VM_BUG_ON_FOLIO(memcg_data & MEMCG_DATA_OBJCGS, folio); |
413 | VM_BUG_ON_FOLIO(!(memcg_data & MEMCG_DATA_KMEM), folio); |
414 | |
415 | return (struct obj_cgroup *)(memcg_data & ~MEMCG_DATA_FLAGS_MASK); |
416 | } |
417 | |
418 | /* |
419 | * folio_memcg - Get the memory cgroup associated with a folio. |
420 | * @folio: Pointer to the folio. |
421 | * |
422 | * Returns a pointer to the memory cgroup associated with the folio, |
423 | * or NULL. This function assumes that the folio is known to have a |
424 | * proper memory cgroup pointer. It's not safe to call this function |
425 | * against some type of folios, e.g. slab folios or ex-slab folios. |
426 | * |
427 | * For a non-kmem folio any of the following ensures folio and memcg binding |
428 | * stability: |
429 | * |
430 | * - the folio lock |
431 | * - LRU isolation |
432 | * - folio_memcg_lock() |
433 | * - exclusive reference |
434 | * - mem_cgroup_trylock_pages() |
435 | * |
436 | * For a kmem folio a caller should hold an rcu read lock to protect memcg |
437 | * associated with a kmem folio from being released. |
438 | */ |
439 | static inline struct mem_cgroup *folio_memcg(struct folio *folio) |
440 | { |
441 | if (folio_memcg_kmem(folio)) |
442 | return obj_cgroup_memcg(objcg: __folio_objcg(folio)); |
443 | return __folio_memcg(folio); |
444 | } |
445 | |
446 | static inline struct mem_cgroup *page_memcg(struct page *page) |
447 | { |
448 | return folio_memcg(page_folio(page)); |
449 | } |
450 | |
451 | /** |
452 | * folio_memcg_rcu - Locklessly get the memory cgroup associated with a folio. |
453 | * @folio: Pointer to the folio. |
454 | * |
455 | * This function assumes that the folio is known to have a |
456 | * proper memory cgroup pointer. It's not safe to call this function |
457 | * against some type of folios, e.g. slab folios or ex-slab folios. |
458 | * |
459 | * Return: A pointer to the memory cgroup associated with the folio, |
460 | * or NULL. |
461 | */ |
462 | static inline struct mem_cgroup *folio_memcg_rcu(struct folio *folio) |
463 | { |
464 | unsigned long memcg_data = READ_ONCE(folio->memcg_data); |
465 | |
466 | VM_BUG_ON_FOLIO(folio_test_slab(folio), folio); |
467 | WARN_ON_ONCE(!rcu_read_lock_held()); |
468 | |
469 | if (memcg_data & MEMCG_DATA_KMEM) { |
470 | struct obj_cgroup *objcg; |
471 | |
472 | objcg = (void *)(memcg_data & ~MEMCG_DATA_FLAGS_MASK); |
473 | return obj_cgroup_memcg(objcg); |
474 | } |
475 | |
476 | return (struct mem_cgroup *)(memcg_data & ~MEMCG_DATA_FLAGS_MASK); |
477 | } |
478 | |
479 | /* |
480 | * folio_memcg_check - Get the memory cgroup associated with a folio. |
481 | * @folio: Pointer to the folio. |
482 | * |
483 | * Returns a pointer to the memory cgroup associated with the folio, |
484 | * or NULL. This function unlike folio_memcg() can take any folio |
485 | * as an argument. It has to be used in cases when it's not known if a folio |
486 | * has an associated memory cgroup pointer or an object cgroups vector or |
487 | * an object cgroup. |
488 | * |
489 | * For a non-kmem folio any of the following ensures folio and memcg binding |
490 | * stability: |
491 | * |
492 | * - the folio lock |
493 | * - LRU isolation |
494 | * - lock_folio_memcg() |
495 | * - exclusive reference |
496 | * - mem_cgroup_trylock_pages() |
497 | * |
498 | * For a kmem folio a caller should hold an rcu read lock to protect memcg |
499 | * associated with a kmem folio from being released. |
500 | */ |
501 | static inline struct mem_cgroup *folio_memcg_check(struct folio *folio) |
502 | { |
503 | /* |
504 | * Because folio->memcg_data might be changed asynchronously |
505 | * for slabs, READ_ONCE() should be used here. |
506 | */ |
507 | unsigned long memcg_data = READ_ONCE(folio->memcg_data); |
508 | |
509 | if (memcg_data & MEMCG_DATA_OBJCGS) |
510 | return NULL; |
511 | |
512 | if (memcg_data & MEMCG_DATA_KMEM) { |
513 | struct obj_cgroup *objcg; |
514 | |
515 | objcg = (void *)(memcg_data & ~MEMCG_DATA_FLAGS_MASK); |
516 | return obj_cgroup_memcg(objcg); |
517 | } |
518 | |
519 | return (struct mem_cgroup *)(memcg_data & ~MEMCG_DATA_FLAGS_MASK); |
520 | } |
521 | |
522 | static inline struct mem_cgroup *page_memcg_check(struct page *page) |
523 | { |
524 | if (PageTail(page)) |
525 | return NULL; |
526 | return folio_memcg_check(folio: (struct folio *)page); |
527 | } |
528 | |
529 | static inline struct mem_cgroup *get_mem_cgroup_from_objcg(struct obj_cgroup *objcg) |
530 | { |
531 | struct mem_cgroup *memcg; |
532 | |
533 | rcu_read_lock(); |
534 | retry: |
535 | memcg = obj_cgroup_memcg(objcg); |
536 | if (unlikely(!css_tryget(&memcg->css))) |
537 | goto retry; |
538 | rcu_read_unlock(); |
539 | |
540 | return memcg; |
541 | } |
542 | |
543 | #ifdef CONFIG_MEMCG_KMEM |
544 | /* |
545 | * folio_memcg_kmem - Check if the folio has the memcg_kmem flag set. |
546 | * @folio: Pointer to the folio. |
547 | * |
548 | * Checks if the folio has MemcgKmem flag set. The caller must ensure |
549 | * that the folio has an associated memory cgroup. It's not safe to call |
550 | * this function against some types of folios, e.g. slab folios. |
551 | */ |
552 | static inline bool folio_memcg_kmem(struct folio *folio) |
553 | { |
554 | VM_BUG_ON_PGFLAGS(PageTail(&folio->page), &folio->page); |
555 | VM_BUG_ON_FOLIO(folio->memcg_data & MEMCG_DATA_OBJCGS, folio); |
556 | return folio->memcg_data & MEMCG_DATA_KMEM; |
557 | } |
558 | |
559 | |
560 | #else |
561 | static inline bool folio_memcg_kmem(struct folio *folio) |
562 | { |
563 | return false; |
564 | } |
565 | |
566 | #endif |
567 | |
568 | static inline bool PageMemcgKmem(struct page *page) |
569 | { |
570 | return folio_memcg_kmem(page_folio(page)); |
571 | } |
572 | |
573 | static inline bool mem_cgroup_is_root(struct mem_cgroup *memcg) |
574 | { |
575 | return (memcg == root_mem_cgroup); |
576 | } |
577 | |
578 | static inline bool mem_cgroup_disabled(void) |
579 | { |
580 | return !cgroup_subsys_enabled(memory_cgrp_subsys); |
581 | } |
582 | |
583 | static inline void mem_cgroup_protection(struct mem_cgroup *root, |
584 | struct mem_cgroup *memcg, |
585 | unsigned long *min, |
586 | unsigned long *low) |
587 | { |
588 | *min = *low = 0; |
589 | |
590 | if (mem_cgroup_disabled()) |
591 | return; |
592 | |
593 | /* |
594 | * There is no reclaim protection applied to a targeted reclaim. |
595 | * We are special casing this specific case here because |
596 | * mem_cgroup_calculate_protection is not robust enough to keep |
597 | * the protection invariant for calculated effective values for |
598 | * parallel reclaimers with different reclaim target. This is |
599 | * especially a problem for tail memcgs (as they have pages on LRU) |
600 | * which would want to have effective values 0 for targeted reclaim |
601 | * but a different value for external reclaim. |
602 | * |
603 | * Example |
604 | * Let's have global and A's reclaim in parallel: |
605 | * | |
606 | * A (low=2G, usage = 3G, max = 3G, children_low_usage = 1.5G) |
607 | * |\ |
608 | * | C (low = 1G, usage = 2.5G) |
609 | * B (low = 1G, usage = 0.5G) |
610 | * |
611 | * For the global reclaim |
612 | * A.elow = A.low |
613 | * B.elow = min(B.usage, B.low) because children_low_usage <= A.elow |
614 | * C.elow = min(C.usage, C.low) |
615 | * |
616 | * With the effective values resetting we have A reclaim |
617 | * A.elow = 0 |
618 | * B.elow = B.low |
619 | * C.elow = C.low |
620 | * |
621 | * If the global reclaim races with A's reclaim then |
622 | * B.elow = C.elow = 0 because children_low_usage > A.elow) |
623 | * is possible and reclaiming B would be violating the protection. |
624 | * |
625 | */ |
626 | if (root == memcg) |
627 | return; |
628 | |
629 | *min = READ_ONCE(memcg->memory.emin); |
630 | *low = READ_ONCE(memcg->memory.elow); |
631 | } |
632 | |
633 | void mem_cgroup_calculate_protection(struct mem_cgroup *root, |
634 | struct mem_cgroup *memcg); |
635 | |
636 | static inline bool mem_cgroup_unprotected(struct mem_cgroup *target, |
637 | struct mem_cgroup *memcg) |
638 | { |
639 | /* |
640 | * The root memcg doesn't account charges, and doesn't support |
641 | * protection. The target memcg's protection is ignored, see |
642 | * mem_cgroup_calculate_protection() and mem_cgroup_protection() |
643 | */ |
644 | return mem_cgroup_disabled() || mem_cgroup_is_root(memcg) || |
645 | memcg == target; |
646 | } |
647 | |
648 | static inline bool mem_cgroup_below_low(struct mem_cgroup *target, |
649 | struct mem_cgroup *memcg) |
650 | { |
651 | if (mem_cgroup_unprotected(target, memcg)) |
652 | return false; |
653 | |
654 | return READ_ONCE(memcg->memory.elow) >= |
655 | page_counter_read(counter: &memcg->memory); |
656 | } |
657 | |
658 | static inline bool mem_cgroup_below_min(struct mem_cgroup *target, |
659 | struct mem_cgroup *memcg) |
660 | { |
661 | if (mem_cgroup_unprotected(target, memcg)) |
662 | return false; |
663 | |
664 | return READ_ONCE(memcg->memory.emin) >= |
665 | page_counter_read(counter: &memcg->memory); |
666 | } |
667 | |
668 | void mem_cgroup_commit_charge(struct folio *folio, struct mem_cgroup *memcg); |
669 | |
670 | int __mem_cgroup_charge(struct folio *folio, struct mm_struct *mm, gfp_t gfp); |
671 | |
672 | /** |
673 | * mem_cgroup_charge - Charge a newly allocated folio to a cgroup. |
674 | * @folio: Folio to charge. |
675 | * @mm: mm context of the allocating task. |
676 | * @gfp: Reclaim mode. |
677 | * |
678 | * Try to charge @folio to the memcg that @mm belongs to, reclaiming |
679 | * pages according to @gfp if necessary. If @mm is NULL, try to |
680 | * charge to the active memcg. |
681 | * |
682 | * Do not use this for folios allocated for swapin. |
683 | * |
684 | * Return: 0 on success. Otherwise, an error code is returned. |
685 | */ |
686 | static inline int mem_cgroup_charge(struct folio *folio, struct mm_struct *mm, |
687 | gfp_t gfp) |
688 | { |
689 | if (mem_cgroup_disabled()) |
690 | return 0; |
691 | return __mem_cgroup_charge(folio, mm, gfp); |
692 | } |
693 | |
694 | int mem_cgroup_hugetlb_try_charge(struct mem_cgroup *memcg, gfp_t gfp, |
695 | long nr_pages); |
696 | |
697 | int mem_cgroup_swapin_charge_folio(struct folio *folio, struct mm_struct *mm, |
698 | gfp_t gfp, swp_entry_t entry); |
699 | void mem_cgroup_swapin_uncharge_swap(swp_entry_t entry); |
700 | |
701 | void __mem_cgroup_uncharge(struct folio *folio); |
702 | |
703 | /** |
704 | * mem_cgroup_uncharge - Uncharge a folio. |
705 | * @folio: Folio to uncharge. |
706 | * |
707 | * Uncharge a folio previously charged with mem_cgroup_charge(). |
708 | */ |
709 | static inline void mem_cgroup_uncharge(struct folio *folio) |
710 | { |
711 | if (mem_cgroup_disabled()) |
712 | return; |
713 | __mem_cgroup_uncharge(folio); |
714 | } |
715 | |
716 | void __mem_cgroup_uncharge_folios(struct folio_batch *folios); |
717 | static inline void mem_cgroup_uncharge_folios(struct folio_batch *folios) |
718 | { |
719 | if (mem_cgroup_disabled()) |
720 | return; |
721 | __mem_cgroup_uncharge_folios(folios); |
722 | } |
723 | |
724 | void mem_cgroup_cancel_charge(struct mem_cgroup *memcg, unsigned int nr_pages); |
725 | void mem_cgroup_replace_folio(struct folio *old, struct folio *new); |
726 | void mem_cgroup_migrate(struct folio *old, struct folio *new); |
727 | |
728 | /** |
729 | * mem_cgroup_lruvec - get the lru list vector for a memcg & node |
730 | * @memcg: memcg of the wanted lruvec |
731 | * @pgdat: pglist_data |
732 | * |
733 | * Returns the lru list vector holding pages for a given @memcg & |
734 | * @pgdat combination. This can be the node lruvec, if the memory |
735 | * controller is disabled. |
736 | */ |
737 | static inline struct lruvec *mem_cgroup_lruvec(struct mem_cgroup *memcg, |
738 | struct pglist_data *pgdat) |
739 | { |
740 | struct mem_cgroup_per_node *mz; |
741 | struct lruvec *lruvec; |
742 | |
743 | if (mem_cgroup_disabled()) { |
744 | lruvec = &pgdat->__lruvec; |
745 | goto out; |
746 | } |
747 | |
748 | if (!memcg) |
749 | memcg = root_mem_cgroup; |
750 | |
751 | mz = memcg->nodeinfo[pgdat->node_id]; |
752 | lruvec = &mz->lruvec; |
753 | out: |
754 | /* |
755 | * Since a node can be onlined after the mem_cgroup was created, |
756 | * we have to be prepared to initialize lruvec->pgdat here; |
757 | * and if offlined then reonlined, we need to reinitialize it. |
758 | */ |
759 | if (unlikely(lruvec->pgdat != pgdat)) |
760 | lruvec->pgdat = pgdat; |
761 | return lruvec; |
762 | } |
763 | |
764 | /** |
765 | * folio_lruvec - return lruvec for isolating/putting an LRU folio |
766 | * @folio: Pointer to the folio. |
767 | * |
768 | * This function relies on folio->mem_cgroup being stable. |
769 | */ |
770 | static inline struct lruvec *folio_lruvec(struct folio *folio) |
771 | { |
772 | struct mem_cgroup *memcg = folio_memcg(folio); |
773 | |
774 | VM_WARN_ON_ONCE_FOLIO(!memcg && !mem_cgroup_disabled(), folio); |
775 | return mem_cgroup_lruvec(memcg, pgdat: folio_pgdat(folio)); |
776 | } |
777 | |
778 | struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p); |
779 | |
780 | struct mem_cgroup *get_mem_cgroup_from_mm(struct mm_struct *mm); |
781 | |
782 | struct mem_cgroup *get_mem_cgroup_from_current(void); |
783 | |
784 | struct lruvec *folio_lruvec_lock(struct folio *folio); |
785 | struct lruvec *folio_lruvec_lock_irq(struct folio *folio); |
786 | struct lruvec *folio_lruvec_lock_irqsave(struct folio *folio, |
787 | unsigned long *flags); |
788 | |
789 | #ifdef CONFIG_DEBUG_VM |
790 | void lruvec_memcg_debug(struct lruvec *lruvec, struct folio *folio); |
791 | #else |
792 | static inline |
793 | void lruvec_memcg_debug(struct lruvec *lruvec, struct folio *folio) |
794 | { |
795 | } |
796 | #endif |
797 | |
798 | static inline |
799 | struct mem_cgroup *mem_cgroup_from_css(struct cgroup_subsys_state *css){ |
800 | return css ? container_of(css, struct mem_cgroup, css) : NULL; |
801 | } |
802 | |
803 | static inline bool obj_cgroup_tryget(struct obj_cgroup *objcg) |
804 | { |
805 | return percpu_ref_tryget(ref: &objcg->refcnt); |
806 | } |
807 | |
808 | static inline void obj_cgroup_get(struct obj_cgroup *objcg) |
809 | { |
810 | percpu_ref_get(ref: &objcg->refcnt); |
811 | } |
812 | |
813 | static inline void obj_cgroup_get_many(struct obj_cgroup *objcg, |
814 | unsigned long nr) |
815 | { |
816 | percpu_ref_get_many(ref: &objcg->refcnt, nr); |
817 | } |
818 | |
819 | static inline void obj_cgroup_put(struct obj_cgroup *objcg) |
820 | { |
821 | percpu_ref_put(ref: &objcg->refcnt); |
822 | } |
823 | |
824 | static inline bool mem_cgroup_tryget(struct mem_cgroup *memcg) |
825 | { |
826 | return !memcg || css_tryget(css: &memcg->css); |
827 | } |
828 | |
829 | static inline bool mem_cgroup_tryget_online(struct mem_cgroup *memcg) |
830 | { |
831 | return !memcg || css_tryget_online(css: &memcg->css); |
832 | } |
833 | |
834 | static inline void mem_cgroup_put(struct mem_cgroup *memcg) |
835 | { |
836 | if (memcg) |
837 | css_put(css: &memcg->css); |
838 | } |
839 | |
840 | #define mem_cgroup_from_counter(counter, member) \ |
841 | container_of(counter, struct mem_cgroup, member) |
842 | |
843 | struct mem_cgroup *mem_cgroup_iter(struct mem_cgroup *, |
844 | struct mem_cgroup *, |
845 | struct mem_cgroup_reclaim_cookie *); |
846 | void mem_cgroup_iter_break(struct mem_cgroup *, struct mem_cgroup *); |
847 | void mem_cgroup_scan_tasks(struct mem_cgroup *memcg, |
848 | int (*)(struct task_struct *, void *), void *arg); |
849 | |
850 | static inline unsigned short mem_cgroup_id(struct mem_cgroup *memcg) |
851 | { |
852 | if (mem_cgroup_disabled()) |
853 | return 0; |
854 | |
855 | return memcg->id.id; |
856 | } |
857 | struct mem_cgroup *mem_cgroup_from_id(unsigned short id); |
858 | |
859 | #ifdef CONFIG_SHRINKER_DEBUG |
860 | static inline unsigned long mem_cgroup_ino(struct mem_cgroup *memcg) |
861 | { |
862 | return memcg ? cgroup_ino(cgrp: memcg->css.cgroup) : 0; |
863 | } |
864 | |
865 | struct mem_cgroup *mem_cgroup_get_from_ino(unsigned long ino); |
866 | #endif |
867 | |
868 | static inline struct mem_cgroup *mem_cgroup_from_seq(struct seq_file *m) |
869 | { |
870 | return mem_cgroup_from_css(css: seq_css(seq: m)); |
871 | } |
872 | |
873 | static inline struct mem_cgroup *lruvec_memcg(struct lruvec *lruvec) |
874 | { |
875 | struct mem_cgroup_per_node *mz; |
876 | |
877 | if (mem_cgroup_disabled()) |
878 | return NULL; |
879 | |
880 | mz = container_of(lruvec, struct mem_cgroup_per_node, lruvec); |
881 | return mz->memcg; |
882 | } |
883 | |
884 | /** |
885 | * parent_mem_cgroup - find the accounting parent of a memcg |
886 | * @memcg: memcg whose parent to find |
887 | * |
888 | * Returns the parent memcg, or NULL if this is the root. |
889 | */ |
890 | static inline struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg) |
891 | { |
892 | return mem_cgroup_from_css(css: memcg->css.parent); |
893 | } |
894 | |
895 | static inline bool mem_cgroup_is_descendant(struct mem_cgroup *memcg, |
896 | struct mem_cgroup *root) |
897 | { |
898 | if (root == memcg) |
899 | return true; |
900 | return cgroup_is_descendant(cgrp: memcg->css.cgroup, ancestor: root->css.cgroup); |
901 | } |
902 | |
903 | static inline bool mm_match_cgroup(struct mm_struct *mm, |
904 | struct mem_cgroup *memcg) |
905 | { |
906 | struct mem_cgroup *task_memcg; |
907 | bool match = false; |
908 | |
909 | rcu_read_lock(); |
910 | task_memcg = mem_cgroup_from_task(rcu_dereference(mm->owner)); |
911 | if (task_memcg) |
912 | match = mem_cgroup_is_descendant(memcg: task_memcg, root: memcg); |
913 | rcu_read_unlock(); |
914 | return match; |
915 | } |
916 | |
917 | struct cgroup_subsys_state *mem_cgroup_css_from_folio(struct folio *folio); |
918 | ino_t page_cgroup_ino(struct page *page); |
919 | |
920 | static inline bool mem_cgroup_online(struct mem_cgroup *memcg) |
921 | { |
922 | if (mem_cgroup_disabled()) |
923 | return true; |
924 | return !!(memcg->css.flags & CSS_ONLINE); |
925 | } |
926 | |
927 | void mem_cgroup_update_lru_size(struct lruvec *lruvec, enum lru_list lru, |
928 | int zid, int nr_pages); |
929 | |
930 | static inline |
931 | unsigned long mem_cgroup_get_zone_lru_size(struct lruvec *lruvec, |
932 | enum lru_list lru, int zone_idx) |
933 | { |
934 | struct mem_cgroup_per_node *mz; |
935 | |
936 | mz = container_of(lruvec, struct mem_cgroup_per_node, lruvec); |
937 | return READ_ONCE(mz->lru_zone_size[zone_idx][lru]); |
938 | } |
939 | |
940 | void mem_cgroup_handle_over_high(gfp_t gfp_mask); |
941 | |
942 | unsigned long mem_cgroup_get_max(struct mem_cgroup *memcg); |
943 | |
944 | unsigned long mem_cgroup_size(struct mem_cgroup *memcg); |
945 | |
946 | void mem_cgroup_print_oom_context(struct mem_cgroup *memcg, |
947 | struct task_struct *p); |
948 | |
949 | void mem_cgroup_print_oom_meminfo(struct mem_cgroup *memcg); |
950 | |
951 | static inline void mem_cgroup_enter_user_fault(void) |
952 | { |
953 | WARN_ON(current->in_user_fault); |
954 | current->in_user_fault = 1; |
955 | } |
956 | |
957 | static inline void mem_cgroup_exit_user_fault(void) |
958 | { |
959 | WARN_ON(!current->in_user_fault); |
960 | current->in_user_fault = 0; |
961 | } |
962 | |
963 | static inline bool task_in_memcg_oom(struct task_struct *p) |
964 | { |
965 | return p->memcg_in_oom; |
966 | } |
967 | |
968 | bool mem_cgroup_oom_synchronize(bool wait); |
969 | struct mem_cgroup *mem_cgroup_get_oom_group(struct task_struct *victim, |
970 | struct mem_cgroup *oom_domain); |
971 | void mem_cgroup_print_oom_group(struct mem_cgroup *memcg); |
972 | |
973 | void folio_memcg_lock(struct folio *folio); |
974 | void folio_memcg_unlock(struct folio *folio); |
975 | |
976 | void __mod_memcg_state(struct mem_cgroup *memcg, int idx, int val); |
977 | |
978 | /* try to stablize folio_memcg() for all the pages in a memcg */ |
979 | static inline bool mem_cgroup_trylock_pages(struct mem_cgroup *memcg) |
980 | { |
981 | rcu_read_lock(); |
982 | |
983 | if (mem_cgroup_disabled() || !atomic_read(v: &memcg->moving_account)) |
984 | return true; |
985 | |
986 | rcu_read_unlock(); |
987 | return false; |
988 | } |
989 | |
990 | static inline void mem_cgroup_unlock_pages(void) |
991 | { |
992 | rcu_read_unlock(); |
993 | } |
994 | |
995 | /* idx can be of type enum memcg_stat_item or node_stat_item */ |
996 | static inline void mod_memcg_state(struct mem_cgroup *memcg, |
997 | int idx, int val) |
998 | { |
999 | unsigned long flags; |
1000 | |
1001 | local_irq_save(flags); |
1002 | __mod_memcg_state(memcg, idx, val); |
1003 | local_irq_restore(flags); |
1004 | } |
1005 | |
1006 | static inline void mod_memcg_page_state(struct page *page, |
1007 | int idx, int val) |
1008 | { |
1009 | struct mem_cgroup *memcg; |
1010 | |
1011 | if (mem_cgroup_disabled()) |
1012 | return; |
1013 | |
1014 | rcu_read_lock(); |
1015 | memcg = page_memcg(page); |
1016 | if (memcg) |
1017 | mod_memcg_state(memcg, idx, val); |
1018 | rcu_read_unlock(); |
1019 | } |
1020 | |
1021 | unsigned long memcg_page_state(struct mem_cgroup *memcg, int idx); |
1022 | |
1023 | static inline unsigned long lruvec_page_state(struct lruvec *lruvec, |
1024 | enum node_stat_item idx) |
1025 | { |
1026 | struct mem_cgroup_per_node *pn; |
1027 | long x; |
1028 | |
1029 | if (mem_cgroup_disabled()) |
1030 | return node_page_state(pgdat: lruvec_pgdat(lruvec), item: idx); |
1031 | |
1032 | pn = container_of(lruvec, struct mem_cgroup_per_node, lruvec); |
1033 | x = READ_ONCE(pn->lruvec_stats.state[idx]); |
1034 | #ifdef CONFIG_SMP |
1035 | if (x < 0) |
1036 | x = 0; |
1037 | #endif |
1038 | return x; |
1039 | } |
1040 | |
1041 | static inline unsigned long lruvec_page_state_local(struct lruvec *lruvec, |
1042 | enum node_stat_item idx) |
1043 | { |
1044 | struct mem_cgroup_per_node *pn; |
1045 | long x = 0; |
1046 | |
1047 | if (mem_cgroup_disabled()) |
1048 | return node_page_state(pgdat: lruvec_pgdat(lruvec), item: idx); |
1049 | |
1050 | pn = container_of(lruvec, struct mem_cgroup_per_node, lruvec); |
1051 | x = READ_ONCE(pn->lruvec_stats.state_local[idx]); |
1052 | #ifdef CONFIG_SMP |
1053 | if (x < 0) |
1054 | x = 0; |
1055 | #endif |
1056 | return x; |
1057 | } |
1058 | |
1059 | void mem_cgroup_flush_stats(struct mem_cgroup *memcg); |
1060 | void mem_cgroup_flush_stats_ratelimited(struct mem_cgroup *memcg); |
1061 | |
1062 | void __mod_memcg_lruvec_state(struct lruvec *lruvec, enum node_stat_item idx, |
1063 | int val); |
1064 | void __mod_lruvec_kmem_state(void *p, enum node_stat_item idx, int val); |
1065 | |
1066 | static inline void mod_lruvec_kmem_state(void *p, enum node_stat_item idx, |
1067 | int val) |
1068 | { |
1069 | unsigned long flags; |
1070 | |
1071 | local_irq_save(flags); |
1072 | __mod_lruvec_kmem_state(p, idx, val); |
1073 | local_irq_restore(flags); |
1074 | } |
1075 | |
1076 | static inline void mod_memcg_lruvec_state(struct lruvec *lruvec, |
1077 | enum node_stat_item idx, int val) |
1078 | { |
1079 | unsigned long flags; |
1080 | |
1081 | local_irq_save(flags); |
1082 | __mod_memcg_lruvec_state(lruvec, idx, val); |
1083 | local_irq_restore(flags); |
1084 | } |
1085 | |
1086 | void __count_memcg_events(struct mem_cgroup *memcg, enum vm_event_item idx, |
1087 | unsigned long count); |
1088 | |
1089 | static inline void count_memcg_events(struct mem_cgroup *memcg, |
1090 | enum vm_event_item idx, |
1091 | unsigned long count) |
1092 | { |
1093 | unsigned long flags; |
1094 | |
1095 | local_irq_save(flags); |
1096 | __count_memcg_events(memcg, idx, count); |
1097 | local_irq_restore(flags); |
1098 | } |
1099 | |
1100 | static inline void count_memcg_folio_events(struct folio *folio, |
1101 | enum vm_event_item idx, unsigned long nr) |
1102 | { |
1103 | struct mem_cgroup *memcg = folio_memcg(folio); |
1104 | |
1105 | if (memcg) |
1106 | count_memcg_events(memcg, idx, count: nr); |
1107 | } |
1108 | |
1109 | static inline void count_memcg_event_mm(struct mm_struct *mm, |
1110 | enum vm_event_item idx) |
1111 | { |
1112 | struct mem_cgroup *memcg; |
1113 | |
1114 | if (mem_cgroup_disabled()) |
1115 | return; |
1116 | |
1117 | rcu_read_lock(); |
1118 | memcg = mem_cgroup_from_task(rcu_dereference(mm->owner)); |
1119 | if (likely(memcg)) |
1120 | count_memcg_events(memcg, idx, count: 1); |
1121 | rcu_read_unlock(); |
1122 | } |
1123 | |
1124 | static inline void memcg_memory_event(struct mem_cgroup *memcg, |
1125 | enum memcg_memory_event event) |
1126 | { |
1127 | bool swap_event = event == MEMCG_SWAP_HIGH || event == MEMCG_SWAP_MAX || |
1128 | event == MEMCG_SWAP_FAIL; |
1129 | |
1130 | atomic_long_inc(v: &memcg->memory_events_local[event]); |
1131 | if (!swap_event) |
1132 | cgroup_file_notify(cfile: &memcg->events_local_file); |
1133 | |
1134 | do { |
1135 | atomic_long_inc(v: &memcg->memory_events[event]); |
1136 | if (swap_event) |
1137 | cgroup_file_notify(cfile: &memcg->swap_events_file); |
1138 | else |
1139 | cgroup_file_notify(cfile: &memcg->events_file); |
1140 | |
1141 | if (!cgroup_subsys_on_dfl(memory_cgrp_subsys)) |
1142 | break; |
1143 | if (cgrp_dfl_root.flags & CGRP_ROOT_MEMORY_LOCAL_EVENTS) |
1144 | break; |
1145 | } while ((memcg = parent_mem_cgroup(memcg)) && |
1146 | !mem_cgroup_is_root(memcg)); |
1147 | } |
1148 | |
1149 | static inline void memcg_memory_event_mm(struct mm_struct *mm, |
1150 | enum memcg_memory_event event) |
1151 | { |
1152 | struct mem_cgroup *memcg; |
1153 | |
1154 | if (mem_cgroup_disabled()) |
1155 | return; |
1156 | |
1157 | rcu_read_lock(); |
1158 | memcg = mem_cgroup_from_task(rcu_dereference(mm->owner)); |
1159 | if (likely(memcg)) |
1160 | memcg_memory_event(memcg, event); |
1161 | rcu_read_unlock(); |
1162 | } |
1163 | |
1164 | void split_page_memcg(struct page *head, int old_order, int new_order); |
1165 | |
1166 | unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t *pgdat, int order, |
1167 | gfp_t gfp_mask, |
1168 | unsigned long *total_scanned); |
1169 | |
1170 | #else /* CONFIG_MEMCG */ |
1171 | |
1172 | #define MEM_CGROUP_ID_SHIFT 0 |
1173 | |
1174 | static inline struct mem_cgroup *folio_memcg(struct folio *folio) |
1175 | { |
1176 | return NULL; |
1177 | } |
1178 | |
1179 | static inline struct mem_cgroup *page_memcg(struct page *page) |
1180 | { |
1181 | return NULL; |
1182 | } |
1183 | |
1184 | static inline struct mem_cgroup *folio_memcg_rcu(struct folio *folio) |
1185 | { |
1186 | WARN_ON_ONCE(!rcu_read_lock_held()); |
1187 | return NULL; |
1188 | } |
1189 | |
1190 | static inline struct mem_cgroup *folio_memcg_check(struct folio *folio) |
1191 | { |
1192 | return NULL; |
1193 | } |
1194 | |
1195 | static inline struct mem_cgroup *page_memcg_check(struct page *page) |
1196 | { |
1197 | return NULL; |
1198 | } |
1199 | |
1200 | static inline struct mem_cgroup *get_mem_cgroup_from_objcg(struct obj_cgroup *objcg) |
1201 | { |
1202 | return NULL; |
1203 | } |
1204 | |
1205 | static inline bool folio_memcg_kmem(struct folio *folio) |
1206 | { |
1207 | return false; |
1208 | } |
1209 | |
1210 | static inline bool PageMemcgKmem(struct page *page) |
1211 | { |
1212 | return false; |
1213 | } |
1214 | |
1215 | static inline bool mem_cgroup_is_root(struct mem_cgroup *memcg) |
1216 | { |
1217 | return true; |
1218 | } |
1219 | |
1220 | static inline bool mem_cgroup_disabled(void) |
1221 | { |
1222 | return true; |
1223 | } |
1224 | |
1225 | static inline void memcg_memory_event(struct mem_cgroup *memcg, |
1226 | enum memcg_memory_event event) |
1227 | { |
1228 | } |
1229 | |
1230 | static inline void memcg_memory_event_mm(struct mm_struct *mm, |
1231 | enum memcg_memory_event event) |
1232 | { |
1233 | } |
1234 | |
1235 | static inline void mem_cgroup_protection(struct mem_cgroup *root, |
1236 | struct mem_cgroup *memcg, |
1237 | unsigned long *min, |
1238 | unsigned long *low) |
1239 | { |
1240 | *min = *low = 0; |
1241 | } |
1242 | |
1243 | static inline void mem_cgroup_calculate_protection(struct mem_cgroup *root, |
1244 | struct mem_cgroup *memcg) |
1245 | { |
1246 | } |
1247 | |
1248 | static inline bool mem_cgroup_unprotected(struct mem_cgroup *target, |
1249 | struct mem_cgroup *memcg) |
1250 | { |
1251 | return true; |
1252 | } |
1253 | static inline bool mem_cgroup_below_low(struct mem_cgroup *target, |
1254 | struct mem_cgroup *memcg) |
1255 | { |
1256 | return false; |
1257 | } |
1258 | |
1259 | static inline bool mem_cgroup_below_min(struct mem_cgroup *target, |
1260 | struct mem_cgroup *memcg) |
1261 | { |
1262 | return false; |
1263 | } |
1264 | |
1265 | static inline void mem_cgroup_commit_charge(struct folio *folio, |
1266 | struct mem_cgroup *memcg) |
1267 | { |
1268 | } |
1269 | |
1270 | static inline int mem_cgroup_charge(struct folio *folio, |
1271 | struct mm_struct *mm, gfp_t gfp) |
1272 | { |
1273 | return 0; |
1274 | } |
1275 | |
1276 | static inline int mem_cgroup_hugetlb_try_charge(struct mem_cgroup *memcg, |
1277 | gfp_t gfp, long nr_pages) |
1278 | { |
1279 | return 0; |
1280 | } |
1281 | |
1282 | static inline int mem_cgroup_swapin_charge_folio(struct folio *folio, |
1283 | struct mm_struct *mm, gfp_t gfp, swp_entry_t entry) |
1284 | { |
1285 | return 0; |
1286 | } |
1287 | |
1288 | static inline void mem_cgroup_swapin_uncharge_swap(swp_entry_t entry) |
1289 | { |
1290 | } |
1291 | |
1292 | static inline void mem_cgroup_uncharge(struct folio *folio) |
1293 | { |
1294 | } |
1295 | |
1296 | static inline void mem_cgroup_uncharge_folios(struct folio_batch *folios) |
1297 | { |
1298 | } |
1299 | |
1300 | static inline void mem_cgroup_cancel_charge(struct mem_cgroup *memcg, |
1301 | unsigned int nr_pages) |
1302 | { |
1303 | } |
1304 | |
1305 | static inline void mem_cgroup_replace_folio(struct folio *old, |
1306 | struct folio *new) |
1307 | { |
1308 | } |
1309 | |
1310 | static inline void mem_cgroup_migrate(struct folio *old, struct folio *new) |
1311 | { |
1312 | } |
1313 | |
1314 | static inline struct lruvec *mem_cgroup_lruvec(struct mem_cgroup *memcg, |
1315 | struct pglist_data *pgdat) |
1316 | { |
1317 | return &pgdat->__lruvec; |
1318 | } |
1319 | |
1320 | static inline struct lruvec *folio_lruvec(struct folio *folio) |
1321 | { |
1322 | struct pglist_data *pgdat = folio_pgdat(folio); |
1323 | return &pgdat->__lruvec; |
1324 | } |
1325 | |
1326 | static inline |
1327 | void lruvec_memcg_debug(struct lruvec *lruvec, struct folio *folio) |
1328 | { |
1329 | } |
1330 | |
1331 | static inline struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg) |
1332 | { |
1333 | return NULL; |
1334 | } |
1335 | |
1336 | static inline bool mm_match_cgroup(struct mm_struct *mm, |
1337 | struct mem_cgroup *memcg) |
1338 | { |
1339 | return true; |
1340 | } |
1341 | |
1342 | static inline struct mem_cgroup *get_mem_cgroup_from_mm(struct mm_struct *mm) |
1343 | { |
1344 | return NULL; |
1345 | } |
1346 | |
1347 | static inline struct mem_cgroup *get_mem_cgroup_from_current(void) |
1348 | { |
1349 | return NULL; |
1350 | } |
1351 | |
1352 | static inline |
1353 | struct mem_cgroup *mem_cgroup_from_css(struct cgroup_subsys_state *css) |
1354 | { |
1355 | return NULL; |
1356 | } |
1357 | |
1358 | static inline void obj_cgroup_put(struct obj_cgroup *objcg) |
1359 | { |
1360 | } |
1361 | |
1362 | static inline bool mem_cgroup_tryget(struct mem_cgroup *memcg) |
1363 | { |
1364 | return true; |
1365 | } |
1366 | |
1367 | static inline bool mem_cgroup_tryget_online(struct mem_cgroup *memcg) |
1368 | { |
1369 | return true; |
1370 | } |
1371 | |
1372 | static inline void mem_cgroup_put(struct mem_cgroup *memcg) |
1373 | { |
1374 | } |
1375 | |
1376 | static inline struct lruvec *folio_lruvec_lock(struct folio *folio) |
1377 | { |
1378 | struct pglist_data *pgdat = folio_pgdat(folio); |
1379 | |
1380 | spin_lock(&pgdat->__lruvec.lru_lock); |
1381 | return &pgdat->__lruvec; |
1382 | } |
1383 | |
1384 | static inline struct lruvec *folio_lruvec_lock_irq(struct folio *folio) |
1385 | { |
1386 | struct pglist_data *pgdat = folio_pgdat(folio); |
1387 | |
1388 | spin_lock_irq(&pgdat->__lruvec.lru_lock); |
1389 | return &pgdat->__lruvec; |
1390 | } |
1391 | |
1392 | static inline struct lruvec *folio_lruvec_lock_irqsave(struct folio *folio, |
1393 | unsigned long *flagsp) |
1394 | { |
1395 | struct pglist_data *pgdat = folio_pgdat(folio); |
1396 | |
1397 | spin_lock_irqsave(&pgdat->__lruvec.lru_lock, *flagsp); |
1398 | return &pgdat->__lruvec; |
1399 | } |
1400 | |
1401 | static inline struct mem_cgroup * |
1402 | mem_cgroup_iter(struct mem_cgroup *root, |
1403 | struct mem_cgroup *prev, |
1404 | struct mem_cgroup_reclaim_cookie *reclaim) |
1405 | { |
1406 | return NULL; |
1407 | } |
1408 | |
1409 | static inline void mem_cgroup_iter_break(struct mem_cgroup *root, |
1410 | struct mem_cgroup *prev) |
1411 | { |
1412 | } |
1413 | |
1414 | static inline void mem_cgroup_scan_tasks(struct mem_cgroup *memcg, |
1415 | int (*fn)(struct task_struct *, void *), void *arg) |
1416 | { |
1417 | } |
1418 | |
1419 | static inline unsigned short mem_cgroup_id(struct mem_cgroup *memcg) |
1420 | { |
1421 | return 0; |
1422 | } |
1423 | |
1424 | static inline struct mem_cgroup *mem_cgroup_from_id(unsigned short id) |
1425 | { |
1426 | WARN_ON_ONCE(id); |
1427 | /* XXX: This should always return root_mem_cgroup */ |
1428 | return NULL; |
1429 | } |
1430 | |
1431 | #ifdef CONFIG_SHRINKER_DEBUG |
1432 | static inline unsigned long mem_cgroup_ino(struct mem_cgroup *memcg) |
1433 | { |
1434 | return 0; |
1435 | } |
1436 | |
1437 | static inline struct mem_cgroup *mem_cgroup_get_from_ino(unsigned long ino) |
1438 | { |
1439 | return NULL; |
1440 | } |
1441 | #endif |
1442 | |
1443 | static inline struct mem_cgroup *mem_cgroup_from_seq(struct seq_file *m) |
1444 | { |
1445 | return NULL; |
1446 | } |
1447 | |
1448 | static inline struct mem_cgroup *lruvec_memcg(struct lruvec *lruvec) |
1449 | { |
1450 | return NULL; |
1451 | } |
1452 | |
1453 | static inline bool mem_cgroup_online(struct mem_cgroup *memcg) |
1454 | { |
1455 | return true; |
1456 | } |
1457 | |
1458 | static inline |
1459 | unsigned long mem_cgroup_get_zone_lru_size(struct lruvec *lruvec, |
1460 | enum lru_list lru, int zone_idx) |
1461 | { |
1462 | return 0; |
1463 | } |
1464 | |
1465 | static inline unsigned long mem_cgroup_get_max(struct mem_cgroup *memcg) |
1466 | { |
1467 | return 0; |
1468 | } |
1469 | |
1470 | static inline unsigned long mem_cgroup_size(struct mem_cgroup *memcg) |
1471 | { |
1472 | return 0; |
1473 | } |
1474 | |
1475 | static inline void |
1476 | mem_cgroup_print_oom_context(struct mem_cgroup *memcg, struct task_struct *p) |
1477 | { |
1478 | } |
1479 | |
1480 | static inline void |
1481 | mem_cgroup_print_oom_meminfo(struct mem_cgroup *memcg) |
1482 | { |
1483 | } |
1484 | |
1485 | static inline void folio_memcg_lock(struct folio *folio) |
1486 | { |
1487 | } |
1488 | |
1489 | static inline void folio_memcg_unlock(struct folio *folio) |
1490 | { |
1491 | } |
1492 | |
1493 | static inline bool mem_cgroup_trylock_pages(struct mem_cgroup *memcg) |
1494 | { |
1495 | /* to match folio_memcg_rcu() */ |
1496 | rcu_read_lock(); |
1497 | return true; |
1498 | } |
1499 | |
1500 | static inline void mem_cgroup_unlock_pages(void) |
1501 | { |
1502 | rcu_read_unlock(); |
1503 | } |
1504 | |
1505 | static inline void mem_cgroup_handle_over_high(gfp_t gfp_mask) |
1506 | { |
1507 | } |
1508 | |
1509 | static inline void mem_cgroup_enter_user_fault(void) |
1510 | { |
1511 | } |
1512 | |
1513 | static inline void mem_cgroup_exit_user_fault(void) |
1514 | { |
1515 | } |
1516 | |
1517 | static inline bool task_in_memcg_oom(struct task_struct *p) |
1518 | { |
1519 | return false; |
1520 | } |
1521 | |
1522 | static inline bool mem_cgroup_oom_synchronize(bool wait) |
1523 | { |
1524 | return false; |
1525 | } |
1526 | |
1527 | static inline struct mem_cgroup *mem_cgroup_get_oom_group( |
1528 | struct task_struct *victim, struct mem_cgroup *oom_domain) |
1529 | { |
1530 | return NULL; |
1531 | } |
1532 | |
1533 | static inline void mem_cgroup_print_oom_group(struct mem_cgroup *memcg) |
1534 | { |
1535 | } |
1536 | |
1537 | static inline void __mod_memcg_state(struct mem_cgroup *memcg, |
1538 | int idx, |
1539 | int nr) |
1540 | { |
1541 | } |
1542 | |
1543 | static inline void mod_memcg_state(struct mem_cgroup *memcg, |
1544 | int idx, |
1545 | int nr) |
1546 | { |
1547 | } |
1548 | |
1549 | static inline void mod_memcg_page_state(struct page *page, |
1550 | int idx, int val) |
1551 | { |
1552 | } |
1553 | |
1554 | static inline unsigned long memcg_page_state(struct mem_cgroup *memcg, int idx) |
1555 | { |
1556 | return 0; |
1557 | } |
1558 | |
1559 | static inline unsigned long lruvec_page_state(struct lruvec *lruvec, |
1560 | enum node_stat_item idx) |
1561 | { |
1562 | return node_page_state(lruvec_pgdat(lruvec), idx); |
1563 | } |
1564 | |
1565 | static inline unsigned long lruvec_page_state_local(struct lruvec *lruvec, |
1566 | enum node_stat_item idx) |
1567 | { |
1568 | return node_page_state(lruvec_pgdat(lruvec), idx); |
1569 | } |
1570 | |
1571 | static inline void mem_cgroup_flush_stats(struct mem_cgroup *memcg) |
1572 | { |
1573 | } |
1574 | |
1575 | static inline void mem_cgroup_flush_stats_ratelimited(struct mem_cgroup *memcg) |
1576 | { |
1577 | } |
1578 | |
1579 | static inline void __mod_memcg_lruvec_state(struct lruvec *lruvec, |
1580 | enum node_stat_item idx, int val) |
1581 | { |
1582 | } |
1583 | |
1584 | static inline void __mod_lruvec_kmem_state(void *p, enum node_stat_item idx, |
1585 | int val) |
1586 | { |
1587 | struct page *page = virt_to_head_page(p); |
1588 | |
1589 | __mod_node_page_state(page_pgdat(page), idx, val); |
1590 | } |
1591 | |
1592 | static inline void mod_lruvec_kmem_state(void *p, enum node_stat_item idx, |
1593 | int val) |
1594 | { |
1595 | struct page *page = virt_to_head_page(p); |
1596 | |
1597 | mod_node_page_state(page_pgdat(page), idx, val); |
1598 | } |
1599 | |
1600 | static inline void count_memcg_events(struct mem_cgroup *memcg, |
1601 | enum vm_event_item idx, |
1602 | unsigned long count) |
1603 | { |
1604 | } |
1605 | |
1606 | static inline void __count_memcg_events(struct mem_cgroup *memcg, |
1607 | enum vm_event_item idx, |
1608 | unsigned long count) |
1609 | { |
1610 | } |
1611 | |
1612 | static inline void count_memcg_folio_events(struct folio *folio, |
1613 | enum vm_event_item idx, unsigned long nr) |
1614 | { |
1615 | } |
1616 | |
1617 | static inline |
1618 | void count_memcg_event_mm(struct mm_struct *mm, enum vm_event_item idx) |
1619 | { |
1620 | } |
1621 | |
1622 | static inline void split_page_memcg(struct page *head, int old_order, int new_order) |
1623 | { |
1624 | } |
1625 | |
1626 | static inline |
1627 | unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t *pgdat, int order, |
1628 | gfp_t gfp_mask, |
1629 | unsigned long *total_scanned) |
1630 | { |
1631 | return 0; |
1632 | } |
1633 | #endif /* CONFIG_MEMCG */ |
1634 | |
1635 | static inline void __inc_lruvec_kmem_state(void *p, enum node_stat_item idx) |
1636 | { |
1637 | __mod_lruvec_kmem_state(p, idx, val: 1); |
1638 | } |
1639 | |
1640 | static inline void __dec_lruvec_kmem_state(void *p, enum node_stat_item idx) |
1641 | { |
1642 | __mod_lruvec_kmem_state(p, idx, val: -1); |
1643 | } |
1644 | |
1645 | static inline struct lruvec *parent_lruvec(struct lruvec *lruvec) |
1646 | { |
1647 | struct mem_cgroup *memcg; |
1648 | |
1649 | memcg = lruvec_memcg(lruvec); |
1650 | if (!memcg) |
1651 | return NULL; |
1652 | memcg = parent_mem_cgroup(memcg); |
1653 | if (!memcg) |
1654 | return NULL; |
1655 | return mem_cgroup_lruvec(memcg, pgdat: lruvec_pgdat(lruvec)); |
1656 | } |
1657 | |
1658 | static inline void unlock_page_lruvec(struct lruvec *lruvec) |
1659 | { |
1660 | spin_unlock(lock: &lruvec->lru_lock); |
1661 | } |
1662 | |
1663 | static inline void unlock_page_lruvec_irq(struct lruvec *lruvec) |
1664 | { |
1665 | spin_unlock_irq(lock: &lruvec->lru_lock); |
1666 | } |
1667 | |
1668 | static inline void unlock_page_lruvec_irqrestore(struct lruvec *lruvec, |
1669 | unsigned long flags) |
1670 | { |
1671 | spin_unlock_irqrestore(lock: &lruvec->lru_lock, flags); |
1672 | } |
1673 | |
1674 | /* Test requires a stable page->memcg binding, see page_memcg() */ |
1675 | static inline bool folio_matches_lruvec(struct folio *folio, |
1676 | struct lruvec *lruvec) |
1677 | { |
1678 | return lruvec_pgdat(lruvec) == folio_pgdat(folio) && |
1679 | lruvec_memcg(lruvec) == folio_memcg(folio); |
1680 | } |
1681 | |
1682 | /* Don't lock again iff page's lruvec locked */ |
1683 | static inline struct lruvec *folio_lruvec_relock_irq(struct folio *folio, |
1684 | struct lruvec *locked_lruvec) |
1685 | { |
1686 | if (locked_lruvec) { |
1687 | if (folio_matches_lruvec(folio, lruvec: locked_lruvec)) |
1688 | return locked_lruvec; |
1689 | |
1690 | unlock_page_lruvec_irq(lruvec: locked_lruvec); |
1691 | } |
1692 | |
1693 | return folio_lruvec_lock_irq(folio); |
1694 | } |
1695 | |
1696 | /* Don't lock again iff folio's lruvec locked */ |
1697 | static inline void folio_lruvec_relock_irqsave(struct folio *folio, |
1698 | struct lruvec **lruvecp, unsigned long *flags) |
1699 | { |
1700 | if (*lruvecp) { |
1701 | if (folio_matches_lruvec(folio, lruvec: *lruvecp)) |
1702 | return; |
1703 | |
1704 | unlock_page_lruvec_irqrestore(lruvec: *lruvecp, flags: *flags); |
1705 | } |
1706 | |
1707 | *lruvecp = folio_lruvec_lock_irqsave(folio, flags); |
1708 | } |
1709 | |
1710 | #ifdef CONFIG_CGROUP_WRITEBACK |
1711 | |
1712 | struct wb_domain *mem_cgroup_wb_domain(struct bdi_writeback *wb); |
1713 | void mem_cgroup_wb_stats(struct bdi_writeback *wb, unsigned long *pfilepages, |
1714 | unsigned long *pheadroom, unsigned long *pdirty, |
1715 | unsigned long *pwriteback); |
1716 | |
1717 | void mem_cgroup_track_foreign_dirty_slowpath(struct folio *folio, |
1718 | struct bdi_writeback *wb); |
1719 | |
1720 | static inline void mem_cgroup_track_foreign_dirty(struct folio *folio, |
1721 | struct bdi_writeback *wb) |
1722 | { |
1723 | struct mem_cgroup *memcg; |
1724 | |
1725 | if (mem_cgroup_disabled()) |
1726 | return; |
1727 | |
1728 | memcg = folio_memcg(folio); |
1729 | if (unlikely(memcg && &memcg->css != wb->memcg_css)) |
1730 | mem_cgroup_track_foreign_dirty_slowpath(folio, wb); |
1731 | } |
1732 | |
1733 | void mem_cgroup_flush_foreign(struct bdi_writeback *wb); |
1734 | |
1735 | #else /* CONFIG_CGROUP_WRITEBACK */ |
1736 | |
1737 | static inline struct wb_domain *mem_cgroup_wb_domain(struct bdi_writeback *wb) |
1738 | { |
1739 | return NULL; |
1740 | } |
1741 | |
1742 | static inline void mem_cgroup_wb_stats(struct bdi_writeback *wb, |
1743 | unsigned long *pfilepages, |
1744 | unsigned long *pheadroom, |
1745 | unsigned long *pdirty, |
1746 | unsigned long *pwriteback) |
1747 | { |
1748 | } |
1749 | |
1750 | static inline void mem_cgroup_track_foreign_dirty(struct folio *folio, |
1751 | struct bdi_writeback *wb) |
1752 | { |
1753 | } |
1754 | |
1755 | static inline void mem_cgroup_flush_foreign(struct bdi_writeback *wb) |
1756 | { |
1757 | } |
1758 | |
1759 | #endif /* CONFIG_CGROUP_WRITEBACK */ |
1760 | |
1761 | struct sock; |
1762 | bool mem_cgroup_charge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages, |
1763 | gfp_t gfp_mask); |
1764 | void mem_cgroup_uncharge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages); |
1765 | #ifdef CONFIG_MEMCG |
1766 | extern struct static_key_false memcg_sockets_enabled_key; |
1767 | #define mem_cgroup_sockets_enabled static_branch_unlikely(&memcg_sockets_enabled_key) |
1768 | void mem_cgroup_sk_alloc(struct sock *sk); |
1769 | void mem_cgroup_sk_free(struct sock *sk); |
1770 | static inline bool mem_cgroup_under_socket_pressure(struct mem_cgroup *memcg) |
1771 | { |
1772 | if (!cgroup_subsys_on_dfl(memory_cgrp_subsys)) |
1773 | return !!memcg->tcpmem_pressure; |
1774 | do { |
1775 | if (time_before(jiffies, READ_ONCE(memcg->socket_pressure))) |
1776 | return true; |
1777 | } while ((memcg = parent_mem_cgroup(memcg))); |
1778 | return false; |
1779 | } |
1780 | |
1781 | int alloc_shrinker_info(struct mem_cgroup *memcg); |
1782 | void free_shrinker_info(struct mem_cgroup *memcg); |
1783 | void set_shrinker_bit(struct mem_cgroup *memcg, int nid, int shrinker_id); |
1784 | void reparent_shrinker_deferred(struct mem_cgroup *memcg); |
1785 | #else |
1786 | #define mem_cgroup_sockets_enabled 0 |
1787 | static inline void mem_cgroup_sk_alloc(struct sock *sk) { }; |
1788 | static inline void mem_cgroup_sk_free(struct sock *sk) { }; |
1789 | static inline bool mem_cgroup_under_socket_pressure(struct mem_cgroup *memcg) |
1790 | { |
1791 | return false; |
1792 | } |
1793 | |
1794 | static inline void set_shrinker_bit(struct mem_cgroup *memcg, |
1795 | int nid, int shrinker_id) |
1796 | { |
1797 | } |
1798 | #endif |
1799 | |
1800 | #ifdef CONFIG_MEMCG_KMEM |
1801 | bool mem_cgroup_kmem_disabled(void); |
1802 | int __memcg_kmem_charge_page(struct page *page, gfp_t gfp, int order); |
1803 | void __memcg_kmem_uncharge_page(struct page *page, int order); |
1804 | |
1805 | /* |
1806 | * The returned objcg pointer is safe to use without additional |
1807 | * protection within a scope. The scope is defined either by |
1808 | * the current task (similar to the "current" global variable) |
1809 | * or by set_active_memcg() pair. |
1810 | * Please, use obj_cgroup_get() to get a reference if the pointer |
1811 | * needs to be used outside of the local scope. |
1812 | */ |
1813 | struct obj_cgroup *current_obj_cgroup(void); |
1814 | struct obj_cgroup *get_obj_cgroup_from_folio(struct folio *folio); |
1815 | |
1816 | static inline struct obj_cgroup *get_obj_cgroup_from_current(void) |
1817 | { |
1818 | struct obj_cgroup *objcg = current_obj_cgroup(); |
1819 | |
1820 | if (objcg) |
1821 | obj_cgroup_get(objcg); |
1822 | |
1823 | return objcg; |
1824 | } |
1825 | |
1826 | int obj_cgroup_charge(struct obj_cgroup *objcg, gfp_t gfp, size_t size); |
1827 | void obj_cgroup_uncharge(struct obj_cgroup *objcg, size_t size); |
1828 | |
1829 | extern struct static_key_false memcg_bpf_enabled_key; |
1830 | static inline bool memcg_bpf_enabled(void) |
1831 | { |
1832 | return static_branch_likely(&memcg_bpf_enabled_key); |
1833 | } |
1834 | |
1835 | extern struct static_key_false memcg_kmem_online_key; |
1836 | |
1837 | static inline bool memcg_kmem_online(void) |
1838 | { |
1839 | return static_branch_likely(&memcg_kmem_online_key); |
1840 | } |
1841 | |
1842 | static inline int memcg_kmem_charge_page(struct page *page, gfp_t gfp, |
1843 | int order) |
1844 | { |
1845 | if (memcg_kmem_online()) |
1846 | return __memcg_kmem_charge_page(page, gfp, order); |
1847 | return 0; |
1848 | } |
1849 | |
1850 | static inline void memcg_kmem_uncharge_page(struct page *page, int order) |
1851 | { |
1852 | if (memcg_kmem_online()) |
1853 | __memcg_kmem_uncharge_page(page, order); |
1854 | } |
1855 | |
1856 | /* |
1857 | * A helper for accessing memcg's kmem_id, used for getting |
1858 | * corresponding LRU lists. |
1859 | */ |
1860 | static inline int memcg_kmem_id(struct mem_cgroup *memcg) |
1861 | { |
1862 | return memcg ? memcg->kmemcg_id : -1; |
1863 | } |
1864 | |
1865 | struct mem_cgroup *mem_cgroup_from_obj(void *p); |
1866 | struct mem_cgroup *mem_cgroup_from_slab_obj(void *p); |
1867 | |
1868 | static inline void count_objcg_event(struct obj_cgroup *objcg, |
1869 | enum vm_event_item idx) |
1870 | { |
1871 | struct mem_cgroup *memcg; |
1872 | |
1873 | if (!memcg_kmem_online()) |
1874 | return; |
1875 | |
1876 | rcu_read_lock(); |
1877 | memcg = obj_cgroup_memcg(objcg); |
1878 | count_memcg_events(memcg, idx, count: 1); |
1879 | rcu_read_unlock(); |
1880 | } |
1881 | |
1882 | #else |
1883 | static inline bool mem_cgroup_kmem_disabled(void) |
1884 | { |
1885 | return true; |
1886 | } |
1887 | |
1888 | static inline int memcg_kmem_charge_page(struct page *page, gfp_t gfp, |
1889 | int order) |
1890 | { |
1891 | return 0; |
1892 | } |
1893 | |
1894 | static inline void memcg_kmem_uncharge_page(struct page *page, int order) |
1895 | { |
1896 | } |
1897 | |
1898 | static inline int __memcg_kmem_charge_page(struct page *page, gfp_t gfp, |
1899 | int order) |
1900 | { |
1901 | return 0; |
1902 | } |
1903 | |
1904 | static inline void __memcg_kmem_uncharge_page(struct page *page, int order) |
1905 | { |
1906 | } |
1907 | |
1908 | static inline struct obj_cgroup *get_obj_cgroup_from_folio(struct folio *folio) |
1909 | { |
1910 | return NULL; |
1911 | } |
1912 | |
1913 | static inline bool memcg_bpf_enabled(void) |
1914 | { |
1915 | return false; |
1916 | } |
1917 | |
1918 | static inline bool memcg_kmem_online(void) |
1919 | { |
1920 | return false; |
1921 | } |
1922 | |
1923 | static inline int memcg_kmem_id(struct mem_cgroup *memcg) |
1924 | { |
1925 | return -1; |
1926 | } |
1927 | |
1928 | static inline struct mem_cgroup *mem_cgroup_from_obj(void *p) |
1929 | { |
1930 | return NULL; |
1931 | } |
1932 | |
1933 | static inline struct mem_cgroup *mem_cgroup_from_slab_obj(void *p) |
1934 | { |
1935 | return NULL; |
1936 | } |
1937 | |
1938 | static inline void count_objcg_event(struct obj_cgroup *objcg, |
1939 | enum vm_event_item idx) |
1940 | { |
1941 | } |
1942 | |
1943 | #endif /* CONFIG_MEMCG_KMEM */ |
1944 | |
1945 | #if defined(CONFIG_MEMCG_KMEM) && defined(CONFIG_ZSWAP) |
1946 | bool obj_cgroup_may_zswap(struct obj_cgroup *objcg); |
1947 | void obj_cgroup_charge_zswap(struct obj_cgroup *objcg, size_t size); |
1948 | void obj_cgroup_uncharge_zswap(struct obj_cgroup *objcg, size_t size); |
1949 | bool mem_cgroup_zswap_writeback_enabled(struct mem_cgroup *memcg); |
1950 | #else |
1951 | static inline bool obj_cgroup_may_zswap(struct obj_cgroup *objcg) |
1952 | { |
1953 | return true; |
1954 | } |
1955 | static inline void obj_cgroup_charge_zswap(struct obj_cgroup *objcg, |
1956 | size_t size) |
1957 | { |
1958 | } |
1959 | static inline void obj_cgroup_uncharge_zswap(struct obj_cgroup *objcg, |
1960 | size_t size) |
1961 | { |
1962 | } |
1963 | static inline bool mem_cgroup_zswap_writeback_enabled(struct mem_cgroup *memcg) |
1964 | { |
1965 | /* if zswap is disabled, do not block pages going to the swapping device */ |
1966 | return true; |
1967 | } |
1968 | #endif |
1969 | |
1970 | #endif /* _LINUX_MEMCONTROL_H */ |
1971 | |