1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* memcontrol.h - Memory Controller 3 * 4 * Copyright IBM Corporation, 2007 5 * Author Balbir Singh <[email protected]> 6 * 7 * Copyright 2007 OpenVZ SWsoft Inc 8 * Author: Pavel Emelianov <[email protected]> 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 page; 27 struct mm_struct; 28 struct kmem_cache; 29 30 /* Cgroup-specific page state, on top of universal node page state */ 31 enum memcg_stat_item { 32 MEMCG_CACHE = NR_VM_NODE_STAT_ITEMS, 33 MEMCG_RSS, 34 MEMCG_RSS_HUGE, 35 MEMCG_SWAP, 36 MEMCG_SOCK, 37 /* XXX: why are these zone and not node counters? */ 38 MEMCG_KERNEL_STACK_KB, 39 MEMCG_NR_STAT, 40 }; 41 42 enum memcg_memory_event { 43 MEMCG_LOW, 44 MEMCG_HIGH, 45 MEMCG_MAX, 46 MEMCG_OOM, 47 MEMCG_OOM_KILL, 48 MEMCG_SWAP_MAX, 49 MEMCG_SWAP_FAIL, 50 MEMCG_NR_MEMORY_EVENTS, 51 }; 52 53 enum mem_cgroup_protection { 54 MEMCG_PROT_NONE, 55 MEMCG_PROT_LOW, 56 MEMCG_PROT_MIN, 57 }; 58 59 struct mem_cgroup_reclaim_cookie { 60 pg_data_t *pgdat; 61 int priority; 62 unsigned int generation; 63 }; 64 65 #ifdef CONFIG_MEMCG 66 67 #define MEM_CGROUP_ID_SHIFT 16 68 #define MEM_CGROUP_ID_MAX USHRT_MAX 69 70 struct mem_cgroup_id { 71 int id; 72 refcount_t ref; 73 }; 74 75 /* 76 * Per memcg event counter is incremented at every pagein/pageout. With THP, 77 * it will be incremated by the number of pages. This counter is used for 78 * for trigger some periodic events. This is straightforward and better 79 * than using jiffies etc. to handle periodic memcg event. 80 */ 81 enum mem_cgroup_events_target { 82 MEM_CGROUP_TARGET_THRESH, 83 MEM_CGROUP_TARGET_SOFTLIMIT, 84 MEM_CGROUP_TARGET_NUMAINFO, 85 MEM_CGROUP_NTARGETS, 86 }; 87 88 struct memcg_vmstats_percpu { 89 long stat[MEMCG_NR_STAT]; 90 unsigned long events[NR_VM_EVENT_ITEMS]; 91 unsigned long nr_page_events; 92 unsigned long targets[MEM_CGROUP_NTARGETS]; 93 }; 94 95 struct mem_cgroup_reclaim_iter { 96 struct mem_cgroup *position; 97 /* scan generation, increased every round-trip */ 98 unsigned int generation; 99 }; 100 101 struct lruvec_stat { 102 long count[NR_VM_NODE_STAT_ITEMS]; 103 }; 104 105 /* 106 * Bitmap of shrinker::id corresponding to memcg-aware shrinkers, 107 * which have elements charged to this memcg. 108 */ 109 struct memcg_shrinker_map { 110 struct rcu_head rcu; 111 unsigned long map[0]; 112 }; 113 114 /* 115 * per-zone information in memory controller. 116 */ 117 struct mem_cgroup_per_node { 118 struct lruvec lruvec; 119 120 struct lruvec_stat __percpu *lruvec_stat_cpu; 121 atomic_long_t lruvec_stat[NR_VM_NODE_STAT_ITEMS]; 122 atomic_long_t lruvec_stat_local[NR_VM_NODE_STAT_ITEMS]; 123 124 unsigned long lru_zone_size[MAX_NR_ZONES][NR_LRU_LISTS]; 125 126 struct mem_cgroup_reclaim_iter iter[DEF_PRIORITY + 1]; 127 128 #ifdef CONFIG_MEMCG_KMEM 129 struct memcg_shrinker_map __rcu *shrinker_map; 130 #endif 131 struct rb_node tree_node; /* RB tree node */ 132 unsigned long usage_in_excess;/* Set to the value by which */ 133 /* the soft limit is exceeded*/ 134 bool on_tree; 135 bool congested; /* memcg has many dirty pages */ 136 /* backed by a congested BDI */ 137 138 struct mem_cgroup *memcg; /* Back pointer, we cannot */ 139 /* use container_of */ 140 }; 141 142 struct mem_cgroup_threshold { 143 struct eventfd_ctx *eventfd; 144 unsigned long threshold; 145 }; 146 147 /* For threshold */ 148 struct mem_cgroup_threshold_ary { 149 /* An array index points to threshold just below or equal to usage. */ 150 int current_threshold; 151 /* Size of entries[] */ 152 unsigned int size; 153 /* Array of thresholds */ 154 struct mem_cgroup_threshold entries[0]; 155 }; 156 157 struct mem_cgroup_thresholds { 158 /* Primary thresholds array */ 159 struct mem_cgroup_threshold_ary *primary; 160 /* 161 * Spare threshold array. 162 * This is needed to make mem_cgroup_unregister_event() "never fail". 163 * It must be able to store at least primary->size - 1 entries. 164 */ 165 struct mem_cgroup_threshold_ary *spare; 166 }; 167 168 enum memcg_kmem_state { 169 KMEM_NONE, 170 KMEM_ALLOCATED, 171 KMEM_ONLINE, 172 }; 173 174 #if defined(CONFIG_SMP) 175 struct memcg_padding { 176 char x[0]; 177 } ____cacheline_internodealigned_in_smp; 178 #define MEMCG_PADDING(name) struct memcg_padding name; 179 #else 180 #define MEMCG_PADDING(name) 181 #endif 182 183 /* 184 * The memory controller data structure. The memory controller controls both 185 * page cache and RSS per cgroup. We would eventually like to provide 186 * statistics based on the statistics developed by Rik Van Riel for clock-pro, 187 * to help the administrator determine what knobs to tune. 188 */ 189 struct mem_cgroup { 190 struct cgroup_subsys_state css; 191 192 /* Private memcg ID. Used to ID objects that outlive the cgroup */ 193 struct mem_cgroup_id id; 194 195 /* Accounted resources */ 196 struct page_counter memory; 197 struct page_counter swap; 198 199 /* Legacy consumer-oriented counters */ 200 struct page_counter memsw; 201 struct page_counter kmem; 202 struct page_counter tcpmem; 203 204 /* Upper bound of normal memory consumption range */ 205 unsigned long high; 206 207 /* Range enforcement for interrupt charges */ 208 struct work_struct high_work; 209 210 unsigned long soft_limit; 211 212 /* vmpressure notifications */ 213 struct vmpressure vmpressure; 214 215 /* 216 * Should the accounting and control be hierarchical, per subtree? 217 */ 218 bool use_hierarchy; 219 220 /* 221 * Should the OOM killer kill all belonging tasks, had it kill one? 222 */ 223 bool oom_group; 224 225 /* protected by memcg_oom_lock */ 226 bool oom_lock; 227 int under_oom; 228 229 int swappiness; 230 /* OOM-Killer disable */ 231 int oom_kill_disable; 232 233 /* memory.events */ 234 struct cgroup_file events_file; 235 236 /* handle for "memory.swap.events" */ 237 struct cgroup_file swap_events_file; 238 239 /* protect arrays of thresholds */ 240 struct mutex thresholds_lock; 241 242 /* thresholds for memory usage. RCU-protected */ 243 struct mem_cgroup_thresholds thresholds; 244 245 /* thresholds for mem+swap usage. RCU-protected */ 246 struct mem_cgroup_thresholds memsw_thresholds; 247 248 /* For oom notifier event fd */ 249 struct list_head oom_notify; 250 251 /* 252 * Should we move charges of a task when a task is moved into this 253 * mem_cgroup ? And what type of charges should we move ? 254 */ 255 unsigned long move_charge_at_immigrate; 256 /* taken only while moving_account > 0 */ 257 spinlock_t move_lock; 258 unsigned long move_lock_flags; 259 260 MEMCG_PADDING(_pad1_); 261 262 /* 263 * set > 0 if pages under this cgroup are moving to other cgroup. 264 */ 265 atomic_t moving_account; 266 struct task_struct *move_lock_task; 267 268 /* memory.stat */ 269 struct memcg_vmstats_percpu __percpu *vmstats_percpu; 270 271 MEMCG_PADDING(_pad2_); 272 273 atomic_long_t vmstats[MEMCG_NR_STAT]; 274 atomic_long_t vmstats_local[MEMCG_NR_STAT]; 275 276 atomic_long_t vmevents[NR_VM_EVENT_ITEMS]; 277 atomic_long_t vmevents_local[NR_VM_EVENT_ITEMS]; 278 279 atomic_long_t memory_events[MEMCG_NR_MEMORY_EVENTS]; 280 281 unsigned long socket_pressure; 282 283 /* Legacy tcp memory accounting */ 284 bool tcpmem_active; 285 int tcpmem_pressure; 286 287 #ifdef CONFIG_MEMCG_KMEM 288 /* Index in the kmem_cache->memcg_params.memcg_caches array */ 289 int kmemcg_id; 290 enum memcg_kmem_state kmem_state; 291 struct list_head kmem_caches; 292 #endif 293 294 int last_scanned_node; 295 #if MAX_NUMNODES > 1 296 nodemask_t scan_nodes; 297 atomic_t numainfo_events; 298 atomic_t numainfo_updating; 299 #endif 300 301 #ifdef CONFIG_CGROUP_WRITEBACK 302 struct list_head cgwb_list; 303 struct wb_domain cgwb_domain; 304 #endif 305 306 /* List of events which userspace want to receive */ 307 struct list_head event_list; 308 spinlock_t event_list_lock; 309 310 struct mem_cgroup_per_node *nodeinfo[0]; 311 /* WARNING: nodeinfo must be the last member here */ 312 }; 313 314 /* 315 * size of first charge trial. "32" comes from vmscan.c's magic value. 316 * TODO: maybe necessary to use big numbers in big irons. 317 */ 318 #define MEMCG_CHARGE_BATCH 32U 319 320 extern struct mem_cgroup *root_mem_cgroup; 321 322 static inline bool mem_cgroup_is_root(struct mem_cgroup *memcg) 323 { 324 return (memcg == root_mem_cgroup); 325 } 326 327 static inline bool mem_cgroup_disabled(void) 328 { 329 return !cgroup_subsys_enabled(memory_cgrp_subsys); 330 } 331 332 enum mem_cgroup_protection mem_cgroup_protected(struct mem_cgroup *root, 333 struct mem_cgroup *memcg); 334 335 int mem_cgroup_try_charge(struct page *page, struct mm_struct *mm, 336 gfp_t gfp_mask, struct mem_cgroup **memcgp, 337 bool compound); 338 int mem_cgroup_try_charge_delay(struct page *page, struct mm_struct *mm, 339 gfp_t gfp_mask, struct mem_cgroup **memcgp, 340 bool compound); 341 void mem_cgroup_commit_charge(struct page *page, struct mem_cgroup *memcg, 342 bool lrucare, bool compound); 343 void mem_cgroup_cancel_charge(struct page *page, struct mem_cgroup *memcg, 344 bool compound); 345 void mem_cgroup_uncharge(struct page *page); 346 void mem_cgroup_uncharge_list(struct list_head *page_list); 347 348 void mem_cgroup_migrate(struct page *oldpage, struct page *newpage); 349 350 static struct mem_cgroup_per_node * 351 mem_cgroup_nodeinfo(struct mem_cgroup *memcg, int nid) 352 { 353 return memcg->nodeinfo[nid]; 354 } 355 356 /** 357 * mem_cgroup_lruvec - get the lru list vector for a node or a memcg zone 358 * @node: node of the wanted lruvec 359 * @memcg: memcg of the wanted lruvec 360 * 361 * Returns the lru list vector holding pages for a given @node or a given 362 * @memcg and @zone. This can be the node lruvec, if the memory controller 363 * is disabled. 364 */ 365 static inline struct lruvec *mem_cgroup_lruvec(struct pglist_data *pgdat, 366 struct mem_cgroup *memcg) 367 { 368 struct mem_cgroup_per_node *mz; 369 struct lruvec *lruvec; 370 371 if (mem_cgroup_disabled()) { 372 lruvec = node_lruvec(pgdat); 373 goto out; 374 } 375 376 mz = mem_cgroup_nodeinfo(memcg, pgdat->node_id); 377 lruvec = &mz->lruvec; 378 out: 379 /* 380 * Since a node can be onlined after the mem_cgroup was created, 381 * we have to be prepared to initialize lruvec->pgdat here; 382 * and if offlined then reonlined, we need to reinitialize it. 383 */ 384 if (unlikely(lruvec->pgdat != pgdat)) 385 lruvec->pgdat = pgdat; 386 return lruvec; 387 } 388 389 struct lruvec *mem_cgroup_page_lruvec(struct page *, struct pglist_data *); 390 391 bool task_in_mem_cgroup(struct task_struct *task, struct mem_cgroup *memcg); 392 struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p); 393 394 struct mem_cgroup *get_mem_cgroup_from_mm(struct mm_struct *mm); 395 396 struct mem_cgroup *get_mem_cgroup_from_page(struct page *page); 397 398 static inline 399 struct mem_cgroup *mem_cgroup_from_css(struct cgroup_subsys_state *css){ 400 return css ? container_of(css, struct mem_cgroup, css) : NULL; 401 } 402 403 static inline void mem_cgroup_put(struct mem_cgroup *memcg) 404 { 405 if (memcg) 406 css_put(&memcg->css); 407 } 408 409 #define mem_cgroup_from_counter(counter, member) \ 410 container_of(counter, struct mem_cgroup, member) 411 412 struct mem_cgroup *mem_cgroup_iter(struct mem_cgroup *, 413 struct mem_cgroup *, 414 struct mem_cgroup_reclaim_cookie *); 415 void mem_cgroup_iter_break(struct mem_cgroup *, struct mem_cgroup *); 416 int mem_cgroup_scan_tasks(struct mem_cgroup *, 417 int (*)(struct task_struct *, void *), void *); 418 419 static inline unsigned short mem_cgroup_id(struct mem_cgroup *memcg) 420 { 421 if (mem_cgroup_disabled()) 422 return 0; 423 424 return memcg->id.id; 425 } 426 struct mem_cgroup *mem_cgroup_from_id(unsigned short id); 427 428 static inline struct mem_cgroup *mem_cgroup_from_seq(struct seq_file *m) 429 { 430 return mem_cgroup_from_css(seq_css(m)); 431 } 432 433 static inline struct mem_cgroup *lruvec_memcg(struct lruvec *lruvec) 434 { 435 struct mem_cgroup_per_node *mz; 436 437 if (mem_cgroup_disabled()) 438 return NULL; 439 440 mz = container_of(lruvec, struct mem_cgroup_per_node, lruvec); 441 return mz->memcg; 442 } 443 444 /** 445 * parent_mem_cgroup - find the accounting parent of a memcg 446 * @memcg: memcg whose parent to find 447 * 448 * Returns the parent memcg, or NULL if this is the root or the memory 449 * controller is in legacy no-hierarchy mode. 450 */ 451 static inline struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg) 452 { 453 if (!memcg->memory.parent) 454 return NULL; 455 return mem_cgroup_from_counter(memcg->memory.parent, memory); 456 } 457 458 static inline bool mem_cgroup_is_descendant(struct mem_cgroup *memcg, 459 struct mem_cgroup *root) 460 { 461 if (root == memcg) 462 return true; 463 if (!root->use_hierarchy) 464 return false; 465 return cgroup_is_descendant(memcg->css.cgroup, root->css.cgroup); 466 } 467 468 static inline bool mm_match_cgroup(struct mm_struct *mm, 469 struct mem_cgroup *memcg) 470 { 471 struct mem_cgroup *task_memcg; 472 bool match = false; 473 474 rcu_read_lock(); 475 task_memcg = mem_cgroup_from_task(rcu_dereference(mm->owner)); 476 if (task_memcg) 477 match = mem_cgroup_is_descendant(task_memcg, memcg); 478 rcu_read_unlock(); 479 return match; 480 } 481 482 struct cgroup_subsys_state *mem_cgroup_css_from_page(struct page *page); 483 ino_t page_cgroup_ino(struct page *page); 484 485 static inline bool mem_cgroup_online(struct mem_cgroup *memcg) 486 { 487 if (mem_cgroup_disabled()) 488 return true; 489 return !!(memcg->css.flags & CSS_ONLINE); 490 } 491 492 /* 493 * For memory reclaim. 494 */ 495 int mem_cgroup_select_victim_node(struct mem_cgroup *memcg); 496 497 void mem_cgroup_update_lru_size(struct lruvec *lruvec, enum lru_list lru, 498 int zid, int nr_pages); 499 500 static inline 501 unsigned long mem_cgroup_get_zone_lru_size(struct lruvec *lruvec, 502 enum lru_list lru, int zone_idx) 503 { 504 struct mem_cgroup_per_node *mz; 505 506 mz = container_of(lruvec, struct mem_cgroup_per_node, lruvec); 507 return mz->lru_zone_size[zone_idx][lru]; 508 } 509 510 void mem_cgroup_handle_over_high(void); 511 512 unsigned long mem_cgroup_get_max(struct mem_cgroup *memcg); 513 514 void mem_cgroup_print_oom_context(struct mem_cgroup *memcg, 515 struct task_struct *p); 516 517 void mem_cgroup_print_oom_meminfo(struct mem_cgroup *memcg); 518 519 static inline void mem_cgroup_enter_user_fault(void) 520 { 521 WARN_ON(current->in_user_fault); 522 current->in_user_fault = 1; 523 } 524 525 static inline void mem_cgroup_exit_user_fault(void) 526 { 527 WARN_ON(!current->in_user_fault); 528 current->in_user_fault = 0; 529 } 530 531 static inline bool task_in_memcg_oom(struct task_struct *p) 532 { 533 return p->memcg_in_oom; 534 } 535 536 bool mem_cgroup_oom_synchronize(bool wait); 537 struct mem_cgroup *mem_cgroup_get_oom_group(struct task_struct *victim, 538 struct mem_cgroup *oom_domain); 539 void mem_cgroup_print_oom_group(struct mem_cgroup *memcg); 540 541 #ifdef CONFIG_MEMCG_SWAP 542 extern int do_swap_account; 543 #endif 544 545 struct mem_cgroup *lock_page_memcg(struct page *page); 546 void __unlock_page_memcg(struct mem_cgroup *memcg); 547 void unlock_page_memcg(struct page *page); 548 549 /* 550 * idx can be of type enum memcg_stat_item or node_stat_item. 551 * Keep in sync with memcg_exact_page_state(). 552 */ 553 static inline unsigned long memcg_page_state(struct mem_cgroup *memcg, int idx) 554 { 555 long x = atomic_long_read(&memcg->vmstats[idx]); 556 #ifdef CONFIG_SMP 557 if (x < 0) 558 x = 0; 559 #endif 560 return x; 561 } 562 563 /* 564 * idx can be of type enum memcg_stat_item or node_stat_item. 565 * Keep in sync with memcg_exact_page_state(). 566 */ 567 static inline unsigned long memcg_page_state_local(struct mem_cgroup *memcg, 568 int idx) 569 { 570 long x = atomic_long_read(&memcg->vmstats_local[idx]); 571 #ifdef CONFIG_SMP 572 if (x < 0) 573 x = 0; 574 #endif 575 return x; 576 } 577 578 void __mod_memcg_state(struct mem_cgroup *memcg, int idx, int val); 579 580 /* idx can be of type enum memcg_stat_item or node_stat_item */ 581 static inline void mod_memcg_state(struct mem_cgroup *memcg, 582 int idx, int val) 583 { 584 unsigned long flags; 585 586 local_irq_save(flags); 587 __mod_memcg_state(memcg, idx, val); 588 local_irq_restore(flags); 589 } 590 591 /** 592 * mod_memcg_page_state - update page state statistics 593 * @page: the page 594 * @idx: page state item to account 595 * @val: number of pages (positive or negative) 596 * 597 * The @page must be locked or the caller must use lock_page_memcg() 598 * to prevent double accounting when the page is concurrently being 599 * moved to another memcg: 600 * 601 * lock_page(page) or lock_page_memcg(page) 602 * if (TestClearPageState(page)) 603 * mod_memcg_page_state(page, state, -1); 604 * unlock_page(page) or unlock_page_memcg(page) 605 * 606 * Kernel pages are an exception to this, since they'll never move. 607 */ 608 static inline void __mod_memcg_page_state(struct page *page, 609 int idx, int val) 610 { 611 if (page->mem_cgroup) 612 __mod_memcg_state(page->mem_cgroup, idx, val); 613 } 614 615 static inline void mod_memcg_page_state(struct page *page, 616 int idx, int val) 617 { 618 if (page->mem_cgroup) 619 mod_memcg_state(page->mem_cgroup, idx, val); 620 } 621 622 static inline unsigned long lruvec_page_state(struct lruvec *lruvec, 623 enum node_stat_item idx) 624 { 625 struct mem_cgroup_per_node *pn; 626 long x; 627 628 if (mem_cgroup_disabled()) 629 return node_page_state(lruvec_pgdat(lruvec), idx); 630 631 pn = container_of(lruvec, struct mem_cgroup_per_node, lruvec); 632 x = atomic_long_read(&pn->lruvec_stat[idx]); 633 #ifdef CONFIG_SMP 634 if (x < 0) 635 x = 0; 636 #endif 637 return x; 638 } 639 640 static inline unsigned long lruvec_page_state_local(struct lruvec *lruvec, 641 enum node_stat_item idx) 642 { 643 struct mem_cgroup_per_node *pn; 644 long x; 645 646 if (mem_cgroup_disabled()) 647 return node_page_state(lruvec_pgdat(lruvec), idx); 648 649 pn = container_of(lruvec, struct mem_cgroup_per_node, lruvec); 650 x = atomic_long_read(&pn->lruvec_stat_local[idx]); 651 #ifdef CONFIG_SMP 652 if (x < 0) 653 x = 0; 654 #endif 655 return x; 656 } 657 658 void __mod_lruvec_state(struct lruvec *lruvec, enum node_stat_item idx, 659 int val); 660 661 static inline void mod_lruvec_state(struct lruvec *lruvec, 662 enum node_stat_item idx, int val) 663 { 664 unsigned long flags; 665 666 local_irq_save(flags); 667 __mod_lruvec_state(lruvec, idx, val); 668 local_irq_restore(flags); 669 } 670 671 static inline void __mod_lruvec_page_state(struct page *page, 672 enum node_stat_item idx, int val) 673 { 674 pg_data_t *pgdat = page_pgdat(page); 675 struct lruvec *lruvec; 676 677 /* Untracked pages have no memcg, no lruvec. Update only the node */ 678 if (!page->mem_cgroup) { 679 __mod_node_page_state(pgdat, idx, val); 680 return; 681 } 682 683 lruvec = mem_cgroup_lruvec(pgdat, page->mem_cgroup); 684 __mod_lruvec_state(lruvec, idx, val); 685 } 686 687 static inline void mod_lruvec_page_state(struct page *page, 688 enum node_stat_item idx, int val) 689 { 690 unsigned long flags; 691 692 local_irq_save(flags); 693 __mod_lruvec_page_state(page, idx, val); 694 local_irq_restore(flags); 695 } 696 697 unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t *pgdat, int order, 698 gfp_t gfp_mask, 699 unsigned long *total_scanned); 700 701 void __count_memcg_events(struct mem_cgroup *memcg, enum vm_event_item idx, 702 unsigned long count); 703 704 static inline void count_memcg_events(struct mem_cgroup *memcg, 705 enum vm_event_item idx, 706 unsigned long count) 707 { 708 unsigned long flags; 709 710 local_irq_save(flags); 711 __count_memcg_events(memcg, idx, count); 712 local_irq_restore(flags); 713 } 714 715 static inline void count_memcg_page_event(struct page *page, 716 enum vm_event_item idx) 717 { 718 if (page->mem_cgroup) 719 count_memcg_events(page->mem_cgroup, idx, 1); 720 } 721 722 static inline void count_memcg_event_mm(struct mm_struct *mm, 723 enum vm_event_item idx) 724 { 725 struct mem_cgroup *memcg; 726 727 if (mem_cgroup_disabled()) 728 return; 729 730 rcu_read_lock(); 731 memcg = mem_cgroup_from_task(rcu_dereference(mm->owner)); 732 if (likely(memcg)) 733 count_memcg_events(memcg, idx, 1); 734 rcu_read_unlock(); 735 } 736 737 static inline void memcg_memory_event(struct mem_cgroup *memcg, 738 enum memcg_memory_event event) 739 { 740 atomic_long_inc(&memcg->memory_events[event]); 741 cgroup_file_notify(&memcg->events_file); 742 } 743 744 static inline void memcg_memory_event_mm(struct mm_struct *mm, 745 enum memcg_memory_event event) 746 { 747 struct mem_cgroup *memcg; 748 749 if (mem_cgroup_disabled()) 750 return; 751 752 rcu_read_lock(); 753 memcg = mem_cgroup_from_task(rcu_dereference(mm->owner)); 754 if (likely(memcg)) 755 memcg_memory_event(memcg, event); 756 rcu_read_unlock(); 757 } 758 759 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 760 void mem_cgroup_split_huge_fixup(struct page *head); 761 #endif 762 763 #else /* CONFIG_MEMCG */ 764 765 #define MEM_CGROUP_ID_SHIFT 0 766 #define MEM_CGROUP_ID_MAX 0 767 768 struct mem_cgroup; 769 770 static inline bool mem_cgroup_is_root(struct mem_cgroup *memcg) 771 { 772 return true; 773 } 774 775 static inline bool mem_cgroup_disabled(void) 776 { 777 return true; 778 } 779 780 static inline void memcg_memory_event(struct mem_cgroup *memcg, 781 enum memcg_memory_event event) 782 { 783 } 784 785 static inline void memcg_memory_event_mm(struct mm_struct *mm, 786 enum memcg_memory_event event) 787 { 788 } 789 790 static inline enum mem_cgroup_protection mem_cgroup_protected( 791 struct mem_cgroup *root, struct mem_cgroup *memcg) 792 { 793 return MEMCG_PROT_NONE; 794 } 795 796 static inline int mem_cgroup_try_charge(struct page *page, struct mm_struct *mm, 797 gfp_t gfp_mask, 798 struct mem_cgroup **memcgp, 799 bool compound) 800 { 801 *memcgp = NULL; 802 return 0; 803 } 804 805 static inline int mem_cgroup_try_charge_delay(struct page *page, 806 struct mm_struct *mm, 807 gfp_t gfp_mask, 808 struct mem_cgroup **memcgp, 809 bool compound) 810 { 811 *memcgp = NULL; 812 return 0; 813 } 814 815 static inline void mem_cgroup_commit_charge(struct page *page, 816 struct mem_cgroup *memcg, 817 bool lrucare, bool compound) 818 { 819 } 820 821 static inline void mem_cgroup_cancel_charge(struct page *page, 822 struct mem_cgroup *memcg, 823 bool compound) 824 { 825 } 826 827 static inline void mem_cgroup_uncharge(struct page *page) 828 { 829 } 830 831 static inline void mem_cgroup_uncharge_list(struct list_head *page_list) 832 { 833 } 834 835 static inline void mem_cgroup_migrate(struct page *old, struct page *new) 836 { 837 } 838 839 static inline struct lruvec *mem_cgroup_lruvec(struct pglist_data *pgdat, 840 struct mem_cgroup *memcg) 841 { 842 return node_lruvec(pgdat); 843 } 844 845 static inline struct lruvec *mem_cgroup_page_lruvec(struct page *page, 846 struct pglist_data *pgdat) 847 { 848 return &pgdat->lruvec; 849 } 850 851 static inline bool mm_match_cgroup(struct mm_struct *mm, 852 struct mem_cgroup *memcg) 853 { 854 return true; 855 } 856 857 static inline bool task_in_mem_cgroup(struct task_struct *task, 858 const struct mem_cgroup *memcg) 859 { 860 return true; 861 } 862 863 static inline struct mem_cgroup *get_mem_cgroup_from_mm(struct mm_struct *mm) 864 { 865 return NULL; 866 } 867 868 static inline struct mem_cgroup *get_mem_cgroup_from_page(struct page *page) 869 { 870 return NULL; 871 } 872 873 static inline void mem_cgroup_put(struct mem_cgroup *memcg) 874 { 875 } 876 877 static inline struct mem_cgroup * 878 mem_cgroup_iter(struct mem_cgroup *root, 879 struct mem_cgroup *prev, 880 struct mem_cgroup_reclaim_cookie *reclaim) 881 { 882 return NULL; 883 } 884 885 static inline void mem_cgroup_iter_break(struct mem_cgroup *root, 886 struct mem_cgroup *prev) 887 { 888 } 889 890 static inline int mem_cgroup_scan_tasks(struct mem_cgroup *memcg, 891 int (*fn)(struct task_struct *, void *), void *arg) 892 { 893 return 0; 894 } 895 896 static inline unsigned short mem_cgroup_id(struct mem_cgroup *memcg) 897 { 898 return 0; 899 } 900 901 static inline struct mem_cgroup *mem_cgroup_from_id(unsigned short id) 902 { 903 WARN_ON_ONCE(id); 904 /* XXX: This should always return root_mem_cgroup */ 905 return NULL; 906 } 907 908 static inline struct mem_cgroup *mem_cgroup_from_seq(struct seq_file *m) 909 { 910 return NULL; 911 } 912 913 static inline struct mem_cgroup *lruvec_memcg(struct lruvec *lruvec) 914 { 915 return NULL; 916 } 917 918 static inline bool mem_cgroup_online(struct mem_cgroup *memcg) 919 { 920 return true; 921 } 922 923 static inline 924 unsigned long mem_cgroup_get_zone_lru_size(struct lruvec *lruvec, 925 enum lru_list lru, int zone_idx) 926 { 927 return 0; 928 } 929 930 static inline unsigned long mem_cgroup_get_max(struct mem_cgroup *memcg) 931 { 932 return 0; 933 } 934 935 static inline void 936 mem_cgroup_print_oom_context(struct mem_cgroup *memcg, struct task_struct *p) 937 { 938 } 939 940 static inline void 941 mem_cgroup_print_oom_meminfo(struct mem_cgroup *memcg) 942 { 943 } 944 945 static inline struct mem_cgroup *lock_page_memcg(struct page *page) 946 { 947 return NULL; 948 } 949 950 static inline void __unlock_page_memcg(struct mem_cgroup *memcg) 951 { 952 } 953 954 static inline void unlock_page_memcg(struct page *page) 955 { 956 } 957 958 static inline void mem_cgroup_handle_over_high(void) 959 { 960 } 961 962 static inline void mem_cgroup_enter_user_fault(void) 963 { 964 } 965 966 static inline void mem_cgroup_exit_user_fault(void) 967 { 968 } 969 970 static inline bool task_in_memcg_oom(struct task_struct *p) 971 { 972 return false; 973 } 974 975 static inline bool mem_cgroup_oom_synchronize(bool wait) 976 { 977 return false; 978 } 979 980 static inline struct mem_cgroup *mem_cgroup_get_oom_group( 981 struct task_struct *victim, struct mem_cgroup *oom_domain) 982 { 983 return NULL; 984 } 985 986 static inline void mem_cgroup_print_oom_group(struct mem_cgroup *memcg) 987 { 988 } 989 990 static inline unsigned long memcg_page_state(struct mem_cgroup *memcg, int idx) 991 { 992 return 0; 993 } 994 995 static inline unsigned long memcg_page_state_local(struct mem_cgroup *memcg, 996 int idx) 997 { 998 return 0; 999 } 1000 1001 static inline void __mod_memcg_state(struct mem_cgroup *memcg, 1002 int idx, 1003 int nr) 1004 { 1005 } 1006 1007 static inline void mod_memcg_state(struct mem_cgroup *memcg, 1008 int idx, 1009 int nr) 1010 { 1011 } 1012 1013 static inline void __mod_memcg_page_state(struct page *page, 1014 int idx, 1015 int nr) 1016 { 1017 } 1018 1019 static inline void mod_memcg_page_state(struct page *page, 1020 int idx, 1021 int nr) 1022 { 1023 } 1024 1025 static inline unsigned long lruvec_page_state(struct lruvec *lruvec, 1026 enum node_stat_item idx) 1027 { 1028 return node_page_state(lruvec_pgdat(lruvec), idx); 1029 } 1030 1031 static inline unsigned long lruvec_page_state_local(struct lruvec *lruvec, 1032 enum node_stat_item idx) 1033 { 1034 return node_page_state(lruvec_pgdat(lruvec), idx); 1035 } 1036 1037 static inline void __mod_lruvec_state(struct lruvec *lruvec, 1038 enum node_stat_item idx, int val) 1039 { 1040 __mod_node_page_state(lruvec_pgdat(lruvec), idx, val); 1041 } 1042 1043 static inline void mod_lruvec_state(struct lruvec *lruvec, 1044 enum node_stat_item idx, int val) 1045 { 1046 mod_node_page_state(lruvec_pgdat(lruvec), idx, val); 1047 } 1048 1049 static inline void __mod_lruvec_page_state(struct page *page, 1050 enum node_stat_item idx, int val) 1051 { 1052 __mod_node_page_state(page_pgdat(page), idx, val); 1053 } 1054 1055 static inline void mod_lruvec_page_state(struct page *page, 1056 enum node_stat_item idx, int val) 1057 { 1058 mod_node_page_state(page_pgdat(page), idx, val); 1059 } 1060 1061 static inline 1062 unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t *pgdat, int order, 1063 gfp_t gfp_mask, 1064 unsigned long *total_scanned) 1065 { 1066 return 0; 1067 } 1068 1069 static inline void mem_cgroup_split_huge_fixup(struct page *head) 1070 { 1071 } 1072 1073 static inline void count_memcg_events(struct mem_cgroup *memcg, 1074 enum vm_event_item idx, 1075 unsigned long count) 1076 { 1077 } 1078 1079 static inline void __count_memcg_events(struct mem_cgroup *memcg, 1080 enum vm_event_item idx, 1081 unsigned long count) 1082 { 1083 } 1084 1085 static inline void count_memcg_page_event(struct page *page, 1086 int idx) 1087 { 1088 } 1089 1090 static inline 1091 void count_memcg_event_mm(struct mm_struct *mm, enum vm_event_item idx) 1092 { 1093 } 1094 #endif /* CONFIG_MEMCG */ 1095 1096 /* idx can be of type enum memcg_stat_item or node_stat_item */ 1097 static inline void __inc_memcg_state(struct mem_cgroup *memcg, 1098 int idx) 1099 { 1100 __mod_memcg_state(memcg, idx, 1); 1101 } 1102 1103 /* idx can be of type enum memcg_stat_item or node_stat_item */ 1104 static inline void __dec_memcg_state(struct mem_cgroup *memcg, 1105 int idx) 1106 { 1107 __mod_memcg_state(memcg, idx, -1); 1108 } 1109 1110 /* idx can be of type enum memcg_stat_item or node_stat_item */ 1111 static inline void __inc_memcg_page_state(struct page *page, 1112 int idx) 1113 { 1114 __mod_memcg_page_state(page, idx, 1); 1115 } 1116 1117 /* idx can be of type enum memcg_stat_item or node_stat_item */ 1118 static inline void __dec_memcg_page_state(struct page *page, 1119 int idx) 1120 { 1121 __mod_memcg_page_state(page, idx, -1); 1122 } 1123 1124 static inline void __inc_lruvec_state(struct lruvec *lruvec, 1125 enum node_stat_item idx) 1126 { 1127 __mod_lruvec_state(lruvec, idx, 1); 1128 } 1129 1130 static inline void __dec_lruvec_state(struct lruvec *lruvec, 1131 enum node_stat_item idx) 1132 { 1133 __mod_lruvec_state(lruvec, idx, -1); 1134 } 1135 1136 static inline void __inc_lruvec_page_state(struct page *page, 1137 enum node_stat_item idx) 1138 { 1139 __mod_lruvec_page_state(page, idx, 1); 1140 } 1141 1142 static inline void __dec_lruvec_page_state(struct page *page, 1143 enum node_stat_item idx) 1144 { 1145 __mod_lruvec_page_state(page, idx, -1); 1146 } 1147 1148 /* idx can be of type enum memcg_stat_item or node_stat_item */ 1149 static inline void inc_memcg_state(struct mem_cgroup *memcg, 1150 int idx) 1151 { 1152 mod_memcg_state(memcg, idx, 1); 1153 } 1154 1155 /* idx can be of type enum memcg_stat_item or node_stat_item */ 1156 static inline void dec_memcg_state(struct mem_cgroup *memcg, 1157 int idx) 1158 { 1159 mod_memcg_state(memcg, idx, -1); 1160 } 1161 1162 /* idx can be of type enum memcg_stat_item or node_stat_item */ 1163 static inline void inc_memcg_page_state(struct page *page, 1164 int idx) 1165 { 1166 mod_memcg_page_state(page, idx, 1); 1167 } 1168 1169 /* idx can be of type enum memcg_stat_item or node_stat_item */ 1170 static inline void dec_memcg_page_state(struct page *page, 1171 int idx) 1172 { 1173 mod_memcg_page_state(page, idx, -1); 1174 } 1175 1176 static inline void inc_lruvec_state(struct lruvec *lruvec, 1177 enum node_stat_item idx) 1178 { 1179 mod_lruvec_state(lruvec, idx, 1); 1180 } 1181 1182 static inline void dec_lruvec_state(struct lruvec *lruvec, 1183 enum node_stat_item idx) 1184 { 1185 mod_lruvec_state(lruvec, idx, -1); 1186 } 1187 1188 static inline void inc_lruvec_page_state(struct page *page, 1189 enum node_stat_item idx) 1190 { 1191 mod_lruvec_page_state(page, idx, 1); 1192 } 1193 1194 static inline void dec_lruvec_page_state(struct page *page, 1195 enum node_stat_item idx) 1196 { 1197 mod_lruvec_page_state(page, idx, -1); 1198 } 1199 1200 #ifdef CONFIG_CGROUP_WRITEBACK 1201 1202 struct wb_domain *mem_cgroup_wb_domain(struct bdi_writeback *wb); 1203 void mem_cgroup_wb_stats(struct bdi_writeback *wb, unsigned long *pfilepages, 1204 unsigned long *pheadroom, unsigned long *pdirty, 1205 unsigned long *pwriteback); 1206 1207 #else /* CONFIG_CGROUP_WRITEBACK */ 1208 1209 static inline struct wb_domain *mem_cgroup_wb_domain(struct bdi_writeback *wb) 1210 { 1211 return NULL; 1212 } 1213 1214 static inline void mem_cgroup_wb_stats(struct bdi_writeback *wb, 1215 unsigned long *pfilepages, 1216 unsigned long *pheadroom, 1217 unsigned long *pdirty, 1218 unsigned long *pwriteback) 1219 { 1220 } 1221 1222 #endif /* CONFIG_CGROUP_WRITEBACK */ 1223 1224 struct sock; 1225 bool mem_cgroup_charge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages); 1226 void mem_cgroup_uncharge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages); 1227 #ifdef CONFIG_MEMCG 1228 extern struct static_key_false memcg_sockets_enabled_key; 1229 #define mem_cgroup_sockets_enabled static_branch_unlikely(&memcg_sockets_enabled_key) 1230 void mem_cgroup_sk_alloc(struct sock *sk); 1231 void mem_cgroup_sk_free(struct sock *sk); 1232 static inline bool mem_cgroup_under_socket_pressure(struct mem_cgroup *memcg) 1233 { 1234 if (!cgroup_subsys_on_dfl(memory_cgrp_subsys) && memcg->tcpmem_pressure) 1235 return true; 1236 do { 1237 if (time_before(jiffies, memcg->socket_pressure)) 1238 return true; 1239 } while ((memcg = parent_mem_cgroup(memcg))); 1240 return false; 1241 } 1242 #else 1243 #define mem_cgroup_sockets_enabled 0 1244 static inline void mem_cgroup_sk_alloc(struct sock *sk) { }; 1245 static inline void mem_cgroup_sk_free(struct sock *sk) { }; 1246 static inline bool mem_cgroup_under_socket_pressure(struct mem_cgroup *memcg) 1247 { 1248 return false; 1249 } 1250 #endif 1251 1252 struct kmem_cache *memcg_kmem_get_cache(struct kmem_cache *cachep); 1253 void memcg_kmem_put_cache(struct kmem_cache *cachep); 1254 1255 #ifdef CONFIG_MEMCG_KMEM 1256 int __memcg_kmem_charge(struct page *page, gfp_t gfp, int order); 1257 void __memcg_kmem_uncharge(struct page *page, int order); 1258 int __memcg_kmem_charge_memcg(struct page *page, gfp_t gfp, int order, 1259 struct mem_cgroup *memcg); 1260 1261 extern struct static_key_false memcg_kmem_enabled_key; 1262 extern struct workqueue_struct *memcg_kmem_cache_wq; 1263 1264 extern int memcg_nr_cache_ids; 1265 void memcg_get_cache_ids(void); 1266 void memcg_put_cache_ids(void); 1267 1268 /* 1269 * Helper macro to loop through all memcg-specific caches. Callers must still 1270 * check if the cache is valid (it is either valid or NULL). 1271 * the slab_mutex must be held when looping through those caches 1272 */ 1273 #define for_each_memcg_cache_index(_idx) \ 1274 for ((_idx) = 0; (_idx) < memcg_nr_cache_ids; (_idx)++) 1275 1276 static inline bool memcg_kmem_enabled(void) 1277 { 1278 return static_branch_unlikely(&memcg_kmem_enabled_key); 1279 } 1280 1281 static inline int memcg_kmem_charge(struct page *page, gfp_t gfp, int order) 1282 { 1283 if (memcg_kmem_enabled()) 1284 return __memcg_kmem_charge(page, gfp, order); 1285 return 0; 1286 } 1287 1288 static inline void memcg_kmem_uncharge(struct page *page, int order) 1289 { 1290 if (memcg_kmem_enabled()) 1291 __memcg_kmem_uncharge(page, order); 1292 } 1293 1294 static inline int memcg_kmem_charge_memcg(struct page *page, gfp_t gfp, 1295 int order, struct mem_cgroup *memcg) 1296 { 1297 if (memcg_kmem_enabled()) 1298 return __memcg_kmem_charge_memcg(page, gfp, order, memcg); 1299 return 0; 1300 } 1301 /* 1302 * helper for accessing a memcg's index. It will be used as an index in the 1303 * child cache array in kmem_cache, and also to derive its name. This function 1304 * will return -1 when this is not a kmem-limited memcg. 1305 */ 1306 static inline int memcg_cache_id(struct mem_cgroup *memcg) 1307 { 1308 return memcg ? memcg->kmemcg_id : -1; 1309 } 1310 1311 extern int memcg_expand_shrinker_maps(int new_id); 1312 1313 extern void memcg_set_shrinker_bit(struct mem_cgroup *memcg, 1314 int nid, int shrinker_id); 1315 #else 1316 1317 static inline int memcg_kmem_charge(struct page *page, gfp_t gfp, int order) 1318 { 1319 return 0; 1320 } 1321 1322 static inline void memcg_kmem_uncharge(struct page *page, int order) 1323 { 1324 } 1325 1326 static inline int __memcg_kmem_charge(struct page *page, gfp_t gfp, int order) 1327 { 1328 return 0; 1329 } 1330 1331 static inline void __memcg_kmem_uncharge(struct page *page, int order) 1332 { 1333 } 1334 1335 #define for_each_memcg_cache_index(_idx) \ 1336 for (; NULL; ) 1337 1338 static inline bool memcg_kmem_enabled(void) 1339 { 1340 return false; 1341 } 1342 1343 static inline int memcg_cache_id(struct mem_cgroup *memcg) 1344 { 1345 return -1; 1346 } 1347 1348 static inline void memcg_get_cache_ids(void) 1349 { 1350 } 1351 1352 static inline void memcg_put_cache_ids(void) 1353 { 1354 } 1355 1356 static inline void memcg_set_shrinker_bit(struct mem_cgroup *memcg, 1357 int nid, int shrinker_id) { } 1358 #endif /* CONFIG_MEMCG_KMEM */ 1359 1360 #endif /* _LINUX_MEMCONTROL_H */ 1361