| 1 | /* memcontrol.h - Memory Controller |
| 2 | * |
| 3 | * Copyright IBM Corporation, 2007 |
| 4 | * Author Balbir Singh <balbir@linux.vnet.ibm.com> |
| 5 | * |
| 6 | * Copyright 2007 OpenVZ SWsoft Inc |
| 7 | * Author: Pavel Emelianov <xemul@openvz.org> |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License as published by |
| 11 | * the Free Software Foundation; either version 2 of the License, or |
| 12 | * (at your option) any later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | * GNU General Public License for more details. |
| 18 | */ |
| 19 | |
| 20 | #ifndef _LINUX_MEMCONTROL_H |
| 21 | #define _LINUX_MEMCONTROL_H |
| 22 | #include <linux/cgroup.h> |
| 23 | #include <linux/vm_event_item.h> |
| 24 | #include <linux/hardirq.h> |
| 25 | #include <linux/jump_label.h> |
| 26 | #include <linux/page_counter.h> |
| 27 | #include <linux/vmpressure.h> |
| 28 | #include <linux/eventfd.h> |
| 29 | #include <linux/mm.h> |
| 30 | #include <linux/vmstat.h> |
| 31 | #include <linux/writeback.h> |
| 32 | #include <linux/page-flags.h> |
| 33 | |
| 34 | struct mem_cgroup; |
| 35 | struct page; |
| 36 | struct mm_struct; |
| 37 | struct kmem_cache; |
| 38 | |
| 39 | /* Cgroup-specific page state, on top of universal node page state */ |
| 40 | enum memcg_stat_item { |
| 41 | MEMCG_CACHE = NR_VM_NODE_STAT_ITEMS, |
| 42 | MEMCG_RSS, |
| 43 | MEMCG_RSS_HUGE, |
| 44 | MEMCG_SWAP, |
| 45 | MEMCG_SOCK, |
| 46 | /* XXX: why are these zone and not node counters? */ |
| 47 | MEMCG_KERNEL_STACK_KB, |
| 48 | MEMCG_NR_STAT, |
| 49 | }; |
| 50 | |
| 51 | /* Cgroup-specific events, on top of universal VM events */ |
| 52 | enum memcg_event_item { |
| 53 | MEMCG_LOW = NR_VM_EVENT_ITEMS, |
| 54 | MEMCG_HIGH, |
| 55 | MEMCG_MAX, |
| 56 | MEMCG_OOM, |
| 57 | MEMCG_NR_EVENTS, |
| 58 | }; |
| 59 | |
| 60 | struct mem_cgroup_reclaim_cookie { |
| 61 | pg_data_t *pgdat; |
| 62 | int priority; |
| 63 | unsigned int generation; |
| 64 | }; |
| 65 | |
| 66 | #ifdef CONFIG_MEMCG |
| 67 | |
| 68 | #define MEM_CGROUP_ID_SHIFT 16 |
| 69 | #define MEM_CGROUP_ID_MAX USHRT_MAX |
| 70 | |
| 71 | struct mem_cgroup_id { |
| 72 | int id; |
| 73 | atomic_t ref; |
| 74 | }; |
| 75 | |
| 76 | /* |
| 77 | * Per memcg event counter is incremented at every pagein/pageout. With THP, |
| 78 | * it will be incremated by the number of pages. This counter is used for |
| 79 | * for trigger some periodic events. This is straightforward and better |
| 80 | * than using jiffies etc. to handle periodic memcg event. |
| 81 | */ |
| 82 | enum mem_cgroup_events_target { |
| 83 | MEM_CGROUP_TARGET_THRESH, |
| 84 | MEM_CGROUP_TARGET_SOFTLIMIT, |
| 85 | MEM_CGROUP_TARGET_NUMAINFO, |
| 86 | MEM_CGROUP_NTARGETS, |
| 87 | }; |
| 88 | |
| 89 | struct mem_cgroup_stat_cpu { |
| 90 | long count[MEMCG_NR_STAT]; |
| 91 | unsigned long events[MEMCG_NR_EVENTS]; |
| 92 | unsigned long nr_page_events; |
| 93 | unsigned long targets[MEM_CGROUP_NTARGETS]; |
| 94 | }; |
| 95 | |
| 96 | struct mem_cgroup_reclaim_iter { |
| 97 | struct mem_cgroup *position; |
| 98 | /* scan generation, increased every round-trip */ |
| 99 | unsigned int generation; |
| 100 | }; |
| 101 | |
| 102 | struct lruvec_stat { |
| 103 | long count[NR_VM_NODE_STAT_ITEMS]; |
| 104 | }; |
| 105 | |
| 106 | /* |
| 107 | * per-zone information in memory controller. |
| 108 | */ |
| 109 | struct mem_cgroup_per_node { |
| 110 | struct lruvec lruvec; |
| 111 | struct lruvec_stat __percpu *lruvec_stat; |
| 112 | unsigned long lru_zone_size[MAX_NR_ZONES][NR_LRU_LISTS]; |
| 113 | |
| 114 | struct mem_cgroup_reclaim_iter iter[DEF_PRIORITY + 1]; |
| 115 | |
| 116 | struct rb_node tree_node; /* RB tree node */ |
| 117 | unsigned long usage_in_excess;/* Set to the value by which */ |
| 118 | /* the soft limit is exceeded*/ |
| 119 | bool on_tree; |
| 120 | struct mem_cgroup *memcg; /* Back pointer, we cannot */ |
| 121 | /* use container_of */ |
| 122 | }; |
| 123 | |
| 124 | struct mem_cgroup_threshold { |
| 125 | struct eventfd_ctx *eventfd; |
| 126 | unsigned long threshold; |
| 127 | }; |
| 128 | |
| 129 | /* For threshold */ |
| 130 | struct mem_cgroup_threshold_ary { |
| 131 | /* An array index points to threshold just below or equal to usage. */ |
| 132 | int current_threshold; |
| 133 | /* Size of entries[] */ |
| 134 | unsigned int size; |
| 135 | /* Array of thresholds */ |
| 136 | struct mem_cgroup_threshold entries[0]; |
| 137 | }; |
| 138 | |
| 139 | struct mem_cgroup_thresholds { |
| 140 | /* Primary thresholds array */ |
| 141 | struct mem_cgroup_threshold_ary *primary; |
| 142 | /* |
| 143 | * Spare threshold array. |
| 144 | * This is needed to make mem_cgroup_unregister_event() "never fail". |
| 145 | * It must be able to store at least primary->size - 1 entries. |
| 146 | */ |
| 147 | struct mem_cgroup_threshold_ary *spare; |
| 148 | }; |
| 149 | |
| 150 | enum memcg_kmem_state { |
| 151 | KMEM_NONE, |
| 152 | KMEM_ALLOCATED, |
| 153 | KMEM_ONLINE, |
| 154 | }; |
| 155 | |
| 156 | /* |
| 157 | * The memory controller data structure. The memory controller controls both |
| 158 | * page cache and RSS per cgroup. We would eventually like to provide |
| 159 | * statistics based on the statistics developed by Rik Van Riel for clock-pro, |
| 160 | * to help the administrator determine what knobs to tune. |
| 161 | */ |
| 162 | struct mem_cgroup { |
| 163 | struct cgroup_subsys_state css; |
| 164 | |
| 165 | /* Private memcg ID. Used to ID objects that outlive the cgroup */ |
| 166 | struct mem_cgroup_id id; |
| 167 | |
| 168 | /* Accounted resources */ |
| 169 | struct page_counter memory; |
| 170 | struct page_counter swap; |
| 171 | |
| 172 | /* Legacy consumer-oriented counters */ |
| 173 | struct page_counter memsw; |
| 174 | struct page_counter kmem; |
| 175 | struct page_counter tcpmem; |
| 176 | |
| 177 | /* Normal memory consumption range */ |
| 178 | unsigned long low; |
| 179 | unsigned long high; |
| 180 | |
| 181 | /* Range enforcement for interrupt charges */ |
| 182 | struct work_struct high_work; |
| 183 | |
| 184 | unsigned long soft_limit; |
| 185 | |
| 186 | /* vmpressure notifications */ |
| 187 | struct vmpressure vmpressure; |
| 188 | |
| 189 | /* |
| 190 | * Should the accounting and control be hierarchical, per subtree? |
| 191 | */ |
| 192 | bool use_hierarchy; |
| 193 | |
| 194 | /* protected by memcg_oom_lock */ |
| 195 | bool oom_lock; |
| 196 | int under_oom; |
| 197 | |
| 198 | int swappiness; |
| 199 | /* OOM-Killer disable */ |
| 200 | int oom_kill_disable; |
| 201 | |
| 202 | /* handle for "memory.events" */ |
| 203 | struct cgroup_file events_file; |
| 204 | |
| 205 | /* protect arrays of thresholds */ |
| 206 | struct mutex thresholds_lock; |
| 207 | |
| 208 | /* thresholds for memory usage. RCU-protected */ |
| 209 | struct mem_cgroup_thresholds thresholds; |
| 210 | |
| 211 | /* thresholds for mem+swap usage. RCU-protected */ |
| 212 | struct mem_cgroup_thresholds memsw_thresholds; |
| 213 | |
| 214 | /* For oom notifier event fd */ |
| 215 | struct list_head oom_notify; |
| 216 | |
| 217 | /* |
| 218 | * Should we move charges of a task when a task is moved into this |
| 219 | * mem_cgroup ? And what type of charges should we move ? |
| 220 | */ |
| 221 | unsigned long move_charge_at_immigrate; |
| 222 | /* |
| 223 | * set > 0 if pages under this cgroup are moving to other cgroup. |
| 224 | */ |
| 225 | atomic_t moving_account; |
| 226 | /* taken only while moving_account > 0 */ |
| 227 | spinlock_t move_lock; |
| 228 | struct task_struct *move_lock_task; |
| 229 | unsigned long move_lock_flags; |
| 230 | /* |
| 231 | * percpu counter. |
| 232 | */ |
| 233 | struct mem_cgroup_stat_cpu __percpu *stat; |
| 234 | |
| 235 | unsigned long socket_pressure; |
| 236 | |
| 237 | /* Legacy tcp memory accounting */ |
| 238 | bool tcpmem_active; |
| 239 | int tcpmem_pressure; |
| 240 | |
| 241 | #ifndef CONFIG_SLOB |
| 242 | /* Index in the kmem_cache->memcg_params.memcg_caches array */ |
| 243 | int kmemcg_id; |
| 244 | enum memcg_kmem_state kmem_state; |
| 245 | struct list_head kmem_caches; |
| 246 | #endif |
| 247 | |
| 248 | int last_scanned_node; |
| 249 | #if MAX_NUMNODES > 1 |
| 250 | nodemask_t scan_nodes; |
| 251 | atomic_t numainfo_events; |
| 252 | atomic_t numainfo_updating; |
| 253 | #endif |
| 254 | |
| 255 | #ifdef CONFIG_CGROUP_WRITEBACK |
| 256 | struct list_head cgwb_list; |
| 257 | struct wb_domain cgwb_domain; |
| 258 | #endif |
| 259 | |
| 260 | /* List of events which userspace want to receive */ |
| 261 | struct list_head event_list; |
| 262 | spinlock_t event_list_lock; |
| 263 | |
| 264 | struct mem_cgroup_per_node *nodeinfo[0]; |
| 265 | /* WARNING: nodeinfo must be the last member here */ |
| 266 | }; |
| 267 | |
| 268 | extern struct mem_cgroup *root_mem_cgroup; |
| 269 | |
| 270 | static inline bool mem_cgroup_disabled(void) |
| 271 | { |
| 272 | return !cgroup_subsys_enabled(memory_cgrp_subsys); |
| 273 | } |
| 274 | |
| 275 | static inline void mem_cgroup_event(struct mem_cgroup *memcg, |
| 276 | enum memcg_event_item event) |
| 277 | { |
| 278 | this_cpu_inc(memcg->stat->events[event]); |
| 279 | cgroup_file_notify(&memcg->events_file); |
| 280 | } |
| 281 | |
| 282 | bool mem_cgroup_low(struct mem_cgroup *root, struct mem_cgroup *memcg); |
| 283 | |
| 284 | int mem_cgroup_try_charge(struct page *page, struct mm_struct *mm, |
| 285 | gfp_t gfp_mask, struct mem_cgroup **memcgp, |
| 286 | bool compound); |
| 287 | void mem_cgroup_commit_charge(struct page *page, struct mem_cgroup *memcg, |
| 288 | bool lrucare, bool compound); |
| 289 | void mem_cgroup_cancel_charge(struct page *page, struct mem_cgroup *memcg, |
| 290 | bool compound); |
| 291 | void mem_cgroup_uncharge(struct page *page); |
| 292 | void mem_cgroup_uncharge_list(struct list_head *page_list); |
| 293 | |
| 294 | void mem_cgroup_migrate(struct page *oldpage, struct page *newpage); |
| 295 | |
| 296 | static struct mem_cgroup_per_node * |
| 297 | mem_cgroup_nodeinfo(struct mem_cgroup *memcg, int nid) |
| 298 | { |
| 299 | return memcg->nodeinfo[nid]; |
| 300 | } |
| 301 | |
| 302 | /** |
| 303 | * mem_cgroup_lruvec - get the lru list vector for a node or a memcg zone |
| 304 | * @node: node of the wanted lruvec |
| 305 | * @memcg: memcg of the wanted lruvec |
| 306 | * |
| 307 | * Returns the lru list vector holding pages for a given @node or a given |
| 308 | * @memcg and @zone. This can be the node lruvec, if the memory controller |
| 309 | * is disabled. |
| 310 | */ |
| 311 | static inline struct lruvec *mem_cgroup_lruvec(struct pglist_data *pgdat, |
| 312 | struct mem_cgroup *memcg) |
| 313 | { |
| 314 | struct mem_cgroup_per_node *mz; |
| 315 | struct lruvec *lruvec; |
| 316 | |
| 317 | if (mem_cgroup_disabled()) { |
| 318 | lruvec = node_lruvec(pgdat); |
| 319 | goto out; |
| 320 | } |
| 321 | |
| 322 | mz = mem_cgroup_nodeinfo(memcg, pgdat->node_id); |
| 323 | lruvec = &mz->lruvec; |
| 324 | out: |
| 325 | /* |
| 326 | * Since a node can be onlined after the mem_cgroup was created, |
| 327 | * we have to be prepared to initialize lruvec->pgdat here; |
| 328 | * and if offlined then reonlined, we need to reinitialize it. |
| 329 | */ |
| 330 | if (unlikely(lruvec->pgdat != pgdat)) |
| 331 | lruvec->pgdat = pgdat; |
| 332 | return lruvec; |
| 333 | } |
| 334 | |
| 335 | struct lruvec *mem_cgroup_page_lruvec(struct page *, struct pglist_data *); |
| 336 | |
| 337 | bool task_in_mem_cgroup(struct task_struct *task, struct mem_cgroup *memcg); |
| 338 | struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p); |
| 339 | |
| 340 | static inline |
| 341 | struct mem_cgroup *mem_cgroup_from_css(struct cgroup_subsys_state *css){ |
| 342 | return css ? container_of(css, struct mem_cgroup, css) : NULL; |
| 343 | } |
| 344 | |
| 345 | #define mem_cgroup_from_counter(counter, member) \ |
| 346 | container_of(counter, struct mem_cgroup, member) |
| 347 | |
| 348 | struct mem_cgroup *mem_cgroup_iter(struct mem_cgroup *, |
| 349 | struct mem_cgroup *, |
| 350 | struct mem_cgroup_reclaim_cookie *); |
| 351 | void mem_cgroup_iter_break(struct mem_cgroup *, struct mem_cgroup *); |
| 352 | int mem_cgroup_scan_tasks(struct mem_cgroup *, |
| 353 | int (*)(struct task_struct *, void *), void *); |
| 354 | |
| 355 | static inline unsigned short mem_cgroup_id(struct mem_cgroup *memcg) |
| 356 | { |
| 357 | if (mem_cgroup_disabled()) |
| 358 | return 0; |
| 359 | |
| 360 | return memcg->id.id; |
| 361 | } |
| 362 | struct mem_cgroup *mem_cgroup_from_id(unsigned short id); |
| 363 | |
| 364 | static inline struct mem_cgroup *lruvec_memcg(struct lruvec *lruvec) |
| 365 | { |
| 366 | struct mem_cgroup_per_node *mz; |
| 367 | |
| 368 | if (mem_cgroup_disabled()) |
| 369 | return NULL; |
| 370 | |
| 371 | mz = container_of(lruvec, struct mem_cgroup_per_node, lruvec); |
| 372 | return mz->memcg; |
| 373 | } |
| 374 | |
| 375 | /** |
| 376 | * parent_mem_cgroup - find the accounting parent of a memcg |
| 377 | * @memcg: memcg whose parent to find |
| 378 | * |
| 379 | * Returns the parent memcg, or NULL if this is the root or the memory |
| 380 | * controller is in legacy no-hierarchy mode. |
| 381 | */ |
| 382 | static inline struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg) |
| 383 | { |
| 384 | if (!memcg->memory.parent) |
| 385 | return NULL; |
| 386 | return mem_cgroup_from_counter(memcg->memory.parent, memory); |
| 387 | } |
| 388 | |
| 389 | static inline bool mem_cgroup_is_descendant(struct mem_cgroup *memcg, |
| 390 | struct mem_cgroup *root) |
| 391 | { |
| 392 | if (root == memcg) |
| 393 | return true; |
| 394 | if (!root->use_hierarchy) |
| 395 | return false; |
| 396 | return cgroup_is_descendant(memcg->css.cgroup, root->css.cgroup); |
| 397 | } |
| 398 | |
| 399 | static inline bool mm_match_cgroup(struct mm_struct *mm, |
| 400 | struct mem_cgroup *memcg) |
| 401 | { |
| 402 | struct mem_cgroup *task_memcg; |
| 403 | bool match = false; |
| 404 | |
| 405 | rcu_read_lock(); |
| 406 | task_memcg = mem_cgroup_from_task(rcu_dereference(mm->owner)); |
| 407 | if (task_memcg) |
| 408 | match = mem_cgroup_is_descendant(task_memcg, memcg); |
| 409 | rcu_read_unlock(); |
| 410 | return match; |
| 411 | } |
| 412 | |
| 413 | struct cgroup_subsys_state *mem_cgroup_css_from_page(struct page *page); |
| 414 | ino_t page_cgroup_ino(struct page *page); |
| 415 | |
| 416 | static inline bool mem_cgroup_online(struct mem_cgroup *memcg) |
| 417 | { |
| 418 | if (mem_cgroup_disabled()) |
| 419 | return true; |
| 420 | return !!(memcg->css.flags & CSS_ONLINE); |
| 421 | } |
| 422 | |
| 423 | /* |
| 424 | * For memory reclaim. |
| 425 | */ |
| 426 | int mem_cgroup_select_victim_node(struct mem_cgroup *memcg); |
| 427 | |
| 428 | void mem_cgroup_update_lru_size(struct lruvec *lruvec, enum lru_list lru, |
| 429 | int zid, int nr_pages); |
| 430 | |
| 431 | unsigned long mem_cgroup_node_nr_lru_pages(struct mem_cgroup *memcg, |
| 432 | int nid, unsigned int lru_mask); |
| 433 | |
| 434 | static inline |
| 435 | unsigned long mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list lru) |
| 436 | { |
| 437 | struct mem_cgroup_per_node *mz; |
| 438 | unsigned long nr_pages = 0; |
| 439 | int zid; |
| 440 | |
| 441 | mz = container_of(lruvec, struct mem_cgroup_per_node, lruvec); |
| 442 | for (zid = 0; zid < MAX_NR_ZONES; zid++) |
| 443 | nr_pages += mz->lru_zone_size[zid][lru]; |
| 444 | return nr_pages; |
| 445 | } |
| 446 | |
| 447 | static inline |
| 448 | unsigned long mem_cgroup_get_zone_lru_size(struct lruvec *lruvec, |
| 449 | enum lru_list lru, int zone_idx) |
| 450 | { |
| 451 | struct mem_cgroup_per_node *mz; |
| 452 | |
| 453 | mz = container_of(lruvec, struct mem_cgroup_per_node, lruvec); |
| 454 | return mz->lru_zone_size[zone_idx][lru]; |
| 455 | } |
| 456 | |
| 457 | void mem_cgroup_handle_over_high(void); |
| 458 | |
| 459 | unsigned long mem_cgroup_get_limit(struct mem_cgroup *memcg); |
| 460 | |
| 461 | void mem_cgroup_print_oom_info(struct mem_cgroup *memcg, |
| 462 | struct task_struct *p); |
| 463 | |
| 464 | static inline void mem_cgroup_oom_enable(void) |
| 465 | { |
| 466 | WARN_ON(current->memcg_may_oom); |
| 467 | current->memcg_may_oom = 1; |
| 468 | } |
| 469 | |
| 470 | static inline void mem_cgroup_oom_disable(void) |
| 471 | { |
| 472 | WARN_ON(!current->memcg_may_oom); |
| 473 | current->memcg_may_oom = 0; |
| 474 | } |
| 475 | |
| 476 | static inline bool task_in_memcg_oom(struct task_struct *p) |
| 477 | { |
| 478 | return p->memcg_in_oom; |
| 479 | } |
| 480 | |
| 481 | bool mem_cgroup_oom_synchronize(bool wait); |
| 482 | |
| 483 | #ifdef CONFIG_MEMCG_SWAP |
| 484 | extern int do_swap_account; |
| 485 | #endif |
| 486 | |
| 487 | struct mem_cgroup *lock_page_memcg(struct page *page); |
| 488 | void __unlock_page_memcg(struct mem_cgroup *memcg); |
| 489 | void unlock_page_memcg(struct page *page); |
| 490 | |
| 491 | /* idx can be of type enum memcg_stat_item or node_stat_item */ |
| 492 | static inline unsigned long memcg_page_state(struct mem_cgroup *memcg, |
| 493 | int idx) |
| 494 | { |
| 495 | long val = 0; |
| 496 | int cpu; |
| 497 | |
| 498 | for_each_possible_cpu(cpu) |
| 499 | val += per_cpu(memcg->stat->count[idx], cpu); |
| 500 | |
| 501 | if (val < 0) |
| 502 | val = 0; |
| 503 | |
| 504 | return val; |
| 505 | } |
| 506 | |
| 507 | /* idx can be of type enum memcg_stat_item or node_stat_item */ |
| 508 | static inline void __mod_memcg_state(struct mem_cgroup *memcg, |
| 509 | int idx, int val) |
| 510 | { |
| 511 | if (!mem_cgroup_disabled()) |
| 512 | __this_cpu_add(memcg->stat->count[idx], val); |
| 513 | } |
| 514 | |
| 515 | /* idx can be of type enum memcg_stat_item or node_stat_item */ |
| 516 | static inline void mod_memcg_state(struct mem_cgroup *memcg, |
| 517 | int idx, int val) |
| 518 | { |
| 519 | if (!mem_cgroup_disabled()) |
| 520 | this_cpu_add(memcg->stat->count[idx], val); |
| 521 | } |
| 522 | |
| 523 | /** |
| 524 | * mod_memcg_page_state - update page state statistics |
| 525 | * @page: the page |
| 526 | * @idx: page state item to account |
| 527 | * @val: number of pages (positive or negative) |
| 528 | * |
| 529 | * The @page must be locked or the caller must use lock_page_memcg() |
| 530 | * to prevent double accounting when the page is concurrently being |
| 531 | * moved to another memcg: |
| 532 | * |
| 533 | * lock_page(page) or lock_page_memcg(page) |
| 534 | * if (TestClearPageState(page)) |
| 535 | * mod_memcg_page_state(page, state, -1); |
| 536 | * unlock_page(page) or unlock_page_memcg(page) |
| 537 | * |
| 538 | * Kernel pages are an exception to this, since they'll never move. |
| 539 | */ |
| 540 | static inline void __mod_memcg_page_state(struct page *page, |
| 541 | int idx, int val) |
| 542 | { |
| 543 | if (page->mem_cgroup) |
| 544 | __mod_memcg_state(page->mem_cgroup, idx, val); |
| 545 | } |
| 546 | |
| 547 | static inline void mod_memcg_page_state(struct page *page, |
| 548 | int idx, int val) |
| 549 | { |
| 550 | if (page->mem_cgroup) |
| 551 | mod_memcg_state(page->mem_cgroup, idx, val); |
| 552 | } |
| 553 | |
| 554 | static inline unsigned long lruvec_page_state(struct lruvec *lruvec, |
| 555 | enum node_stat_item idx) |
| 556 | { |
| 557 | struct mem_cgroup_per_node *pn; |
| 558 | long val = 0; |
| 559 | int cpu; |
| 560 | |
| 561 | if (mem_cgroup_disabled()) |
| 562 | return node_page_state(lruvec_pgdat(lruvec), idx); |
| 563 | |
| 564 | pn = container_of(lruvec, struct mem_cgroup_per_node, lruvec); |
| 565 | for_each_possible_cpu(cpu) |
| 566 | val += per_cpu(pn->lruvec_stat->count[idx], cpu); |
| 567 | |
| 568 | if (val < 0) |
| 569 | val = 0; |
| 570 | |
| 571 | return val; |
| 572 | } |
| 573 | |
| 574 | static inline void __mod_lruvec_state(struct lruvec *lruvec, |
| 575 | enum node_stat_item idx, int val) |
| 576 | { |
| 577 | struct mem_cgroup_per_node *pn; |
| 578 | |
| 579 | __mod_node_page_state(lruvec_pgdat(lruvec), idx, val); |
| 580 | if (mem_cgroup_disabled()) |
| 581 | return; |
| 582 | pn = container_of(lruvec, struct mem_cgroup_per_node, lruvec); |
| 583 | __mod_memcg_state(pn->memcg, idx, val); |
| 584 | __this_cpu_add(pn->lruvec_stat->count[idx], val); |
| 585 | } |
| 586 | |
| 587 | static inline void mod_lruvec_state(struct lruvec *lruvec, |
| 588 | enum node_stat_item idx, int val) |
| 589 | { |
| 590 | struct mem_cgroup_per_node *pn; |
| 591 | |
| 592 | mod_node_page_state(lruvec_pgdat(lruvec), idx, val); |
| 593 | if (mem_cgroup_disabled()) |
| 594 | return; |
| 595 | pn = container_of(lruvec, struct mem_cgroup_per_node, lruvec); |
| 596 | mod_memcg_state(pn->memcg, idx, val); |
| 597 | this_cpu_add(pn->lruvec_stat->count[idx], val); |
| 598 | } |
| 599 | |
| 600 | static inline void __mod_lruvec_page_state(struct page *page, |
| 601 | enum node_stat_item idx, int val) |
| 602 | { |
| 603 | struct mem_cgroup_per_node *pn; |
| 604 | |
| 605 | __mod_node_page_state(page_pgdat(page), idx, val); |
| 606 | if (mem_cgroup_disabled() || !page->mem_cgroup) |
| 607 | return; |
| 608 | __mod_memcg_state(page->mem_cgroup, idx, val); |
| 609 | pn = page->mem_cgroup->nodeinfo[page_to_nid(page)]; |
| 610 | __this_cpu_add(pn->lruvec_stat->count[idx], val); |
| 611 | } |
| 612 | |
| 613 | static inline void mod_lruvec_page_state(struct page *page, |
| 614 | enum node_stat_item idx, int val) |
| 615 | { |
| 616 | struct mem_cgroup_per_node *pn; |
| 617 | |
| 618 | mod_node_page_state(page_pgdat(page), idx, val); |
| 619 | if (mem_cgroup_disabled() || !page->mem_cgroup) |
| 620 | return; |
| 621 | mod_memcg_state(page->mem_cgroup, idx, val); |
| 622 | pn = page->mem_cgroup->nodeinfo[page_to_nid(page)]; |
| 623 | this_cpu_add(pn->lruvec_stat->count[idx], val); |
| 624 | } |
| 625 | |
| 626 | unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t *pgdat, int order, |
| 627 | gfp_t gfp_mask, |
| 628 | unsigned long *total_scanned); |
| 629 | |
| 630 | static inline void count_memcg_events(struct mem_cgroup *memcg, |
| 631 | enum vm_event_item idx, |
| 632 | unsigned long count) |
| 633 | { |
| 634 | if (!mem_cgroup_disabled()) |
| 635 | this_cpu_add(memcg->stat->events[idx], count); |
| 636 | } |
| 637 | |
| 638 | /* idx can be of type enum memcg_stat_item or node_stat_item */ |
| 639 | static inline void count_memcg_page_event(struct page *page, |
| 640 | int idx) |
| 641 | { |
| 642 | if (page->mem_cgroup) |
| 643 | count_memcg_events(page->mem_cgroup, idx, 1); |
| 644 | } |
| 645 | |
| 646 | static inline void count_memcg_event_mm(struct mm_struct *mm, |
| 647 | enum vm_event_item idx) |
| 648 | { |
| 649 | struct mem_cgroup *memcg; |
| 650 | |
| 651 | if (mem_cgroup_disabled()) |
| 652 | return; |
| 653 | |
| 654 | rcu_read_lock(); |
| 655 | memcg = mem_cgroup_from_task(rcu_dereference(mm->owner)); |
| 656 | if (likely(memcg)) { |
| 657 | this_cpu_inc(memcg->stat->events[idx]); |
| 658 | if (idx == OOM_KILL) |
| 659 | cgroup_file_notify(&memcg->events_file); |
| 660 | } |
| 661 | rcu_read_unlock(); |
| 662 | } |
| 663 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
| 664 | void mem_cgroup_split_huge_fixup(struct page *head); |
| 665 | #endif |
| 666 | |
| 667 | #else /* CONFIG_MEMCG */ |
| 668 | |
| 669 | #define MEM_CGROUP_ID_SHIFT 0 |
| 670 | #define MEM_CGROUP_ID_MAX 0 |
| 671 | |
| 672 | struct mem_cgroup; |
| 673 | |
| 674 | static inline bool mem_cgroup_disabled(void) |
| 675 | { |
| 676 | return true; |
| 677 | } |
| 678 | |
| 679 | static inline void mem_cgroup_event(struct mem_cgroup *memcg, |
| 680 | enum memcg_event_item event) |
| 681 | { |
| 682 | } |
| 683 | |
| 684 | static inline bool mem_cgroup_low(struct mem_cgroup *root, |
| 685 | struct mem_cgroup *memcg) |
| 686 | { |
| 687 | return false; |
| 688 | } |
| 689 | |
| 690 | static inline int mem_cgroup_try_charge(struct page *page, struct mm_struct *mm, |
| 691 | gfp_t gfp_mask, |
| 692 | struct mem_cgroup **memcgp, |
| 693 | bool compound) |
| 694 | { |
| 695 | *memcgp = NULL; |
| 696 | return 0; |
| 697 | } |
| 698 | |
| 699 | static inline void mem_cgroup_commit_charge(struct page *page, |
| 700 | struct mem_cgroup *memcg, |
| 701 | bool lrucare, bool compound) |
| 702 | { |
| 703 | } |
| 704 | |
| 705 | static inline void mem_cgroup_cancel_charge(struct page *page, |
| 706 | struct mem_cgroup *memcg, |
| 707 | bool compound) |
| 708 | { |
| 709 | } |
| 710 | |
| 711 | static inline void mem_cgroup_uncharge(struct page *page) |
| 712 | { |
| 713 | } |
| 714 | |
| 715 | static inline void mem_cgroup_uncharge_list(struct list_head *page_list) |
| 716 | { |
| 717 | } |
| 718 | |
| 719 | static inline void mem_cgroup_migrate(struct page *old, struct page *new) |
| 720 | { |
| 721 | } |
| 722 | |
| 723 | static inline struct lruvec *mem_cgroup_lruvec(struct pglist_data *pgdat, |
| 724 | struct mem_cgroup *memcg) |
| 725 | { |
| 726 | return node_lruvec(pgdat); |
| 727 | } |
| 728 | |
| 729 | static inline struct lruvec *mem_cgroup_page_lruvec(struct page *page, |
| 730 | struct pglist_data *pgdat) |
| 731 | { |
| 732 | return &pgdat->lruvec; |
| 733 | } |
| 734 | |
| 735 | static inline bool mm_match_cgroup(struct mm_struct *mm, |
| 736 | struct mem_cgroup *memcg) |
| 737 | { |
| 738 | return true; |
| 739 | } |
| 740 | |
| 741 | static inline bool task_in_mem_cgroup(struct task_struct *task, |
| 742 | const struct mem_cgroup *memcg) |
| 743 | { |
| 744 | return true; |
| 745 | } |
| 746 | |
| 747 | static inline struct mem_cgroup * |
| 748 | mem_cgroup_iter(struct mem_cgroup *root, |
| 749 | struct mem_cgroup *prev, |
| 750 | struct mem_cgroup_reclaim_cookie *reclaim) |
| 751 | { |
| 752 | return NULL; |
| 753 | } |
| 754 | |
| 755 | static inline void mem_cgroup_iter_break(struct mem_cgroup *root, |
| 756 | struct mem_cgroup *prev) |
| 757 | { |
| 758 | } |
| 759 | |
| 760 | static inline int mem_cgroup_scan_tasks(struct mem_cgroup *memcg, |
| 761 | int (*fn)(struct task_struct *, void *), void *arg) |
| 762 | { |
| 763 | return 0; |
| 764 | } |
| 765 | |
| 766 | static inline unsigned short mem_cgroup_id(struct mem_cgroup *memcg) |
| 767 | { |
| 768 | return 0; |
| 769 | } |
| 770 | |
| 771 | static inline struct mem_cgroup *mem_cgroup_from_id(unsigned short id) |
| 772 | { |
| 773 | WARN_ON_ONCE(id); |
| 774 | /* XXX: This should always return root_mem_cgroup */ |
| 775 | return NULL; |
| 776 | } |
| 777 | |
| 778 | static inline struct mem_cgroup *lruvec_memcg(struct lruvec *lruvec) |
| 779 | { |
| 780 | return NULL; |
| 781 | } |
| 782 | |
| 783 | static inline bool mem_cgroup_online(struct mem_cgroup *memcg) |
| 784 | { |
| 785 | return true; |
| 786 | } |
| 787 | |
| 788 | static inline unsigned long |
| 789 | mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list lru) |
| 790 | { |
| 791 | return 0; |
| 792 | } |
| 793 | static inline |
| 794 | unsigned long mem_cgroup_get_zone_lru_size(struct lruvec *lruvec, |
| 795 | enum lru_list lru, int zone_idx) |
| 796 | { |
| 797 | return 0; |
| 798 | } |
| 799 | |
| 800 | static inline unsigned long |
| 801 | mem_cgroup_node_nr_lru_pages(struct mem_cgroup *memcg, |
| 802 | int nid, unsigned int lru_mask) |
| 803 | { |
| 804 | return 0; |
| 805 | } |
| 806 | |
| 807 | static inline unsigned long mem_cgroup_get_limit(struct mem_cgroup *memcg) |
| 808 | { |
| 809 | return 0; |
| 810 | } |
| 811 | |
| 812 | static inline void |
| 813 | mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p) |
| 814 | { |
| 815 | } |
| 816 | |
| 817 | static inline struct mem_cgroup *lock_page_memcg(struct page *page) |
| 818 | { |
| 819 | return NULL; |
| 820 | } |
| 821 | |
| 822 | static inline void __unlock_page_memcg(struct mem_cgroup *memcg) |
| 823 | { |
| 824 | } |
| 825 | |
| 826 | static inline void unlock_page_memcg(struct page *page) |
| 827 | { |
| 828 | } |
| 829 | |
| 830 | static inline void mem_cgroup_handle_over_high(void) |
| 831 | { |
| 832 | } |
| 833 | |
| 834 | static inline void mem_cgroup_oom_enable(void) |
| 835 | { |
| 836 | } |
| 837 | |
| 838 | static inline void mem_cgroup_oom_disable(void) |
| 839 | { |
| 840 | } |
| 841 | |
| 842 | static inline bool task_in_memcg_oom(struct task_struct *p) |
| 843 | { |
| 844 | return false; |
| 845 | } |
| 846 | |
| 847 | static inline bool mem_cgroup_oom_synchronize(bool wait) |
| 848 | { |
| 849 | return false; |
| 850 | } |
| 851 | |
| 852 | static inline unsigned long memcg_page_state(struct mem_cgroup *memcg, |
| 853 | int idx) |
| 854 | { |
| 855 | return 0; |
| 856 | } |
| 857 | |
| 858 | static inline void __mod_memcg_state(struct mem_cgroup *memcg, |
| 859 | int idx, |
| 860 | int nr) |
| 861 | { |
| 862 | } |
| 863 | |
| 864 | static inline void mod_memcg_state(struct mem_cgroup *memcg, |
| 865 | int idx, |
| 866 | int nr) |
| 867 | { |
| 868 | } |
| 869 | |
| 870 | static inline void __mod_memcg_page_state(struct page *page, |
| 871 | int idx, |
| 872 | int nr) |
| 873 | { |
| 874 | } |
| 875 | |
| 876 | static inline void mod_memcg_page_state(struct page *page, |
| 877 | int idx, |
| 878 | int nr) |
| 879 | { |
| 880 | } |
| 881 | |
| 882 | static inline unsigned long lruvec_page_state(struct lruvec *lruvec, |
| 883 | enum node_stat_item idx) |
| 884 | { |
| 885 | return node_page_state(lruvec_pgdat(lruvec), idx); |
| 886 | } |
| 887 | |
| 888 | static inline void __mod_lruvec_state(struct lruvec *lruvec, |
| 889 | enum node_stat_item idx, int val) |
| 890 | { |
| 891 | __mod_node_page_state(lruvec_pgdat(lruvec), idx, val); |
| 892 | } |
| 893 | |
| 894 | static inline void mod_lruvec_state(struct lruvec *lruvec, |
| 895 | enum node_stat_item idx, int val) |
| 896 | { |
| 897 | mod_node_page_state(lruvec_pgdat(lruvec), idx, val); |
| 898 | } |
| 899 | |
| 900 | static inline void __mod_lruvec_page_state(struct page *page, |
| 901 | enum node_stat_item idx, int val) |
| 902 | { |
| 903 | __mod_node_page_state(page_pgdat(page), idx, val); |
| 904 | } |
| 905 | |
| 906 | static inline void mod_lruvec_page_state(struct page *page, |
| 907 | enum node_stat_item idx, int val) |
| 908 | { |
| 909 | mod_node_page_state(page_pgdat(page), idx, val); |
| 910 | } |
| 911 | |
| 912 | static inline |
| 913 | unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t *pgdat, int order, |
| 914 | gfp_t gfp_mask, |
| 915 | unsigned long *total_scanned) |
| 916 | { |
| 917 | return 0; |
| 918 | } |
| 919 | |
| 920 | static inline void mem_cgroup_split_huge_fixup(struct page *head) |
| 921 | { |
| 922 | } |
| 923 | |
| 924 | static inline void count_memcg_events(struct mem_cgroup *memcg, |
| 925 | enum vm_event_item idx, |
| 926 | unsigned long count) |
| 927 | { |
| 928 | } |
| 929 | |
| 930 | static inline void count_memcg_page_event(struct page *page, |
| 931 | int idx) |
| 932 | { |
| 933 | } |
| 934 | |
| 935 | static inline |
| 936 | void count_memcg_event_mm(struct mm_struct *mm, enum vm_event_item idx) |
| 937 | { |
| 938 | } |
| 939 | #endif /* CONFIG_MEMCG */ |
| 940 | |
| 941 | /* idx can be of type enum memcg_stat_item or node_stat_item */ |
| 942 | static inline void __inc_memcg_state(struct mem_cgroup *memcg, |
| 943 | int idx) |
| 944 | { |
| 945 | __mod_memcg_state(memcg, idx, 1); |
| 946 | } |
| 947 | |
| 948 | /* idx can be of type enum memcg_stat_item or node_stat_item */ |
| 949 | static inline void __dec_memcg_state(struct mem_cgroup *memcg, |
| 950 | int idx) |
| 951 | { |
| 952 | __mod_memcg_state(memcg, idx, -1); |
| 953 | } |
| 954 | |
| 955 | /* idx can be of type enum memcg_stat_item or node_stat_item */ |
| 956 | static inline void __inc_memcg_page_state(struct page *page, |
| 957 | int idx) |
| 958 | { |
| 959 | __mod_memcg_page_state(page, idx, 1); |
| 960 | } |
| 961 | |
| 962 | /* idx can be of type enum memcg_stat_item or node_stat_item */ |
| 963 | static inline void __dec_memcg_page_state(struct page *page, |
| 964 | int idx) |
| 965 | { |
| 966 | __mod_memcg_page_state(page, idx, -1); |
| 967 | } |
| 968 | |
| 969 | static inline void __inc_lruvec_state(struct lruvec *lruvec, |
| 970 | enum node_stat_item idx) |
| 971 | { |
| 972 | __mod_lruvec_state(lruvec, idx, 1); |
| 973 | } |
| 974 | |
| 975 | static inline void __dec_lruvec_state(struct lruvec *lruvec, |
| 976 | enum node_stat_item idx) |
| 977 | { |
| 978 | __mod_lruvec_state(lruvec, idx, -1); |
| 979 | } |
| 980 | |
| 981 | static inline void __inc_lruvec_page_state(struct page *page, |
| 982 | enum node_stat_item idx) |
| 983 | { |
| 984 | __mod_lruvec_page_state(page, idx, 1); |
| 985 | } |
| 986 | |
| 987 | static inline void __dec_lruvec_page_state(struct page *page, |
| 988 | enum node_stat_item idx) |
| 989 | { |
| 990 | __mod_lruvec_page_state(page, idx, -1); |
| 991 | } |
| 992 | |
| 993 | /* idx can be of type enum memcg_stat_item or node_stat_item */ |
| 994 | static inline void inc_memcg_state(struct mem_cgroup *memcg, |
| 995 | int idx) |
| 996 | { |
| 997 | mod_memcg_state(memcg, idx, 1); |
| 998 | } |
| 999 | |
| 1000 | /* idx can be of type enum memcg_stat_item or node_stat_item */ |
| 1001 | static inline void dec_memcg_state(struct mem_cgroup *memcg, |
| 1002 | int idx) |
| 1003 | { |
| 1004 | mod_memcg_state(memcg, idx, -1); |
| 1005 | } |
| 1006 | |
| 1007 | /* idx can be of type enum memcg_stat_item or node_stat_item */ |
| 1008 | static inline void inc_memcg_page_state(struct page *page, |
| 1009 | int idx) |
| 1010 | { |
| 1011 | mod_memcg_page_state(page, idx, 1); |
| 1012 | } |
| 1013 | |
| 1014 | /* idx can be of type enum memcg_stat_item or node_stat_item */ |
| 1015 | static inline void dec_memcg_page_state(struct page *page, |
| 1016 | int idx) |
| 1017 | { |
| 1018 | mod_memcg_page_state(page, idx, -1); |
| 1019 | } |
| 1020 | |
| 1021 | static inline void inc_lruvec_state(struct lruvec *lruvec, |
| 1022 | enum node_stat_item idx) |
| 1023 | { |
| 1024 | mod_lruvec_state(lruvec, idx, 1); |
| 1025 | } |
| 1026 | |
| 1027 | static inline void dec_lruvec_state(struct lruvec *lruvec, |
| 1028 | enum node_stat_item idx) |
| 1029 | { |
| 1030 | mod_lruvec_state(lruvec, idx, -1); |
| 1031 | } |
| 1032 | |
| 1033 | static inline void inc_lruvec_page_state(struct page *page, |
| 1034 | enum node_stat_item idx) |
| 1035 | { |
| 1036 | mod_lruvec_page_state(page, idx, 1); |
| 1037 | } |
| 1038 | |
| 1039 | static inline void dec_lruvec_page_state(struct page *page, |
| 1040 | enum node_stat_item idx) |
| 1041 | { |
| 1042 | mod_lruvec_page_state(page, idx, -1); |
| 1043 | } |
| 1044 | |
| 1045 | #ifdef CONFIG_CGROUP_WRITEBACK |
| 1046 | |
| 1047 | struct list_head *mem_cgroup_cgwb_list(struct mem_cgroup *memcg); |
| 1048 | struct wb_domain *mem_cgroup_wb_domain(struct bdi_writeback *wb); |
| 1049 | void mem_cgroup_wb_stats(struct bdi_writeback *wb, unsigned long *pfilepages, |
| 1050 | unsigned long *pheadroom, unsigned long *pdirty, |
| 1051 | unsigned long *pwriteback); |
| 1052 | |
| 1053 | #else /* CONFIG_CGROUP_WRITEBACK */ |
| 1054 | |
| 1055 | static inline struct wb_domain *mem_cgroup_wb_domain(struct bdi_writeback *wb) |
| 1056 | { |
| 1057 | return NULL; |
| 1058 | } |
| 1059 | |
| 1060 | static inline void mem_cgroup_wb_stats(struct bdi_writeback *wb, |
| 1061 | unsigned long *pfilepages, |
| 1062 | unsigned long *pheadroom, |
| 1063 | unsigned long *pdirty, |
| 1064 | unsigned long *pwriteback) |
| 1065 | { |
| 1066 | } |
| 1067 | |
| 1068 | #endif /* CONFIG_CGROUP_WRITEBACK */ |
| 1069 | |
| 1070 | struct sock; |
| 1071 | bool mem_cgroup_charge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages); |
| 1072 | void mem_cgroup_uncharge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages); |
| 1073 | #ifdef CONFIG_MEMCG |
| 1074 | extern struct static_key_false memcg_sockets_enabled_key; |
| 1075 | #define mem_cgroup_sockets_enabled static_branch_unlikely(&memcg_sockets_enabled_key) |
| 1076 | void mem_cgroup_sk_alloc(struct sock *sk); |
| 1077 | void mem_cgroup_sk_free(struct sock *sk); |
| 1078 | static inline bool mem_cgroup_under_socket_pressure(struct mem_cgroup *memcg) |
| 1079 | { |
| 1080 | if (!cgroup_subsys_on_dfl(memory_cgrp_subsys) && memcg->tcpmem_pressure) |
| 1081 | return true; |
| 1082 | do { |
| 1083 | if (time_before(jiffies, memcg->socket_pressure)) |
| 1084 | return true; |
| 1085 | } while ((memcg = parent_mem_cgroup(memcg))); |
| 1086 | return false; |
| 1087 | } |
| 1088 | #else |
| 1089 | #define mem_cgroup_sockets_enabled 0 |
| 1090 | static inline void mem_cgroup_sk_alloc(struct sock *sk) { }; |
| 1091 | static inline void mem_cgroup_sk_free(struct sock *sk) { }; |
| 1092 | static inline bool mem_cgroup_under_socket_pressure(struct mem_cgroup *memcg) |
| 1093 | { |
| 1094 | return false; |
| 1095 | } |
| 1096 | #endif |
| 1097 | |
| 1098 | struct kmem_cache *memcg_kmem_get_cache(struct kmem_cache *cachep); |
| 1099 | void memcg_kmem_put_cache(struct kmem_cache *cachep); |
| 1100 | int memcg_kmem_charge_memcg(struct page *page, gfp_t gfp, int order, |
| 1101 | struct mem_cgroup *memcg); |
| 1102 | int memcg_kmem_charge(struct page *page, gfp_t gfp, int order); |
| 1103 | void memcg_kmem_uncharge(struct page *page, int order); |
| 1104 | |
| 1105 | #if defined(CONFIG_MEMCG) && !defined(CONFIG_SLOB) |
| 1106 | extern struct static_key_false memcg_kmem_enabled_key; |
| 1107 | extern struct workqueue_struct *memcg_kmem_cache_wq; |
| 1108 | |
| 1109 | extern int memcg_nr_cache_ids; |
| 1110 | void memcg_get_cache_ids(void); |
| 1111 | void memcg_put_cache_ids(void); |
| 1112 | |
| 1113 | /* |
| 1114 | * Helper macro to loop through all memcg-specific caches. Callers must still |
| 1115 | * check if the cache is valid (it is either valid or NULL). |
| 1116 | * the slab_mutex must be held when looping through those caches |
| 1117 | */ |
| 1118 | #define for_each_memcg_cache_index(_idx) \ |
| 1119 | for ((_idx) = 0; (_idx) < memcg_nr_cache_ids; (_idx)++) |
| 1120 | |
| 1121 | static inline bool memcg_kmem_enabled(void) |
| 1122 | { |
| 1123 | return static_branch_unlikely(&memcg_kmem_enabled_key); |
| 1124 | } |
| 1125 | |
| 1126 | /* |
| 1127 | * helper for accessing a memcg's index. It will be used as an index in the |
| 1128 | * child cache array in kmem_cache, and also to derive its name. This function |
| 1129 | * will return -1 when this is not a kmem-limited memcg. |
| 1130 | */ |
| 1131 | static inline int memcg_cache_id(struct mem_cgroup *memcg) |
| 1132 | { |
| 1133 | return memcg ? memcg->kmemcg_id : -1; |
| 1134 | } |
| 1135 | |
| 1136 | #else |
| 1137 | #define for_each_memcg_cache_index(_idx) \ |
| 1138 | for (; NULL; ) |
| 1139 | |
| 1140 | static inline bool memcg_kmem_enabled(void) |
| 1141 | { |
| 1142 | return false; |
| 1143 | } |
| 1144 | |
| 1145 | static inline int memcg_cache_id(struct mem_cgroup *memcg) |
| 1146 | { |
| 1147 | return -1; |
| 1148 | } |
| 1149 | |
| 1150 | static inline void memcg_get_cache_ids(void) |
| 1151 | { |
| 1152 | } |
| 1153 | |
| 1154 | static inline void memcg_put_cache_ids(void) |
| 1155 | { |
| 1156 | } |
| 1157 | |
| 1158 | #endif /* CONFIG_MEMCG && !CONFIG_SLOB */ |
| 1159 | |
| 1160 | #endif /* _LINUX_MEMCONTROL_H */ |