include/linux/memcontrol.h

   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
  25 struct mem_cgroup;
  26 struct page_cgroup;
  27 struct page;
  28 struct mm_struct;
  29
  30 /* Stats that can be updated by kernel. */
  31 enum mem_cgroup_page_stat_item {
  32         MEMCG_NR_FILE_MAPPED, /* # of pages charged as file rss */
  33 };
  34
  35 struct mem_cgroup_reclaim_cookie {
  36         struct zone *zone;
  37         int priority;
  38         unsigned int generation;
  39 };
  40
  41 #ifdef CONFIG_CGROUP_MEM_RES_CTLR
  42 /*
  43  * All "charge" functions with gfp_mask should use GFP_KERNEL or
  44  * (gfp_mask & GFP_RECLAIM_MASK). In current implementatin, memcg doesn't
  45  * alloc memory but reclaims memory from all available zones. So, "where I want
  46  * memory from" bits of gfp_mask has no meaning. So any bits of that field is
  47  * available but adding a rule is better. charge functions' gfp_mask should
  48  * be set to GFP_KERNEL or gfp_mask & GFP_RECLAIM_MASK for avoiding ambiguous
  49  * codes.
  50  * (Of course, if memcg does memory allocation in future, GFP_KERNEL is sane.)
  51  */
  52
  53 extern int mem_cgroup_newpage_charge(struct page *page, struct mm_struct *mm,
  54                                 gfp_t gfp_mask);
  55 /* for swap handling */
  56 extern int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
  57                 struct page *page, gfp_t mask, struct mem_cgroup **memcgp);
  58 extern void mem_cgroup_commit_charge_swapin(struct page *page,
  59                                         struct mem_cgroup *memcg);
  60 extern void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *memcg);
  61
  62 extern int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
  63                                         gfp_t gfp_mask);
  64
  65 struct lruvec *mem_cgroup_zone_lruvec(struct zone *, struct mem_cgroup *);
  66 struct lruvec *mem_cgroup_lru_add_list(struct zone *, struct page *,
  67                                        enum lru_list);
  68 void mem_cgroup_lru_del_list(struct page *, enum lru_list);
  69 void mem_cgroup_lru_del(struct page *);
  70 struct lruvec *mem_cgroup_lru_move_lists(struct zone *, struct page *,
  71                                          enum lru_list, enum lru_list);
  72
  73 /* For coalescing uncharge for reducing memcg' overhead*/
  74 extern void mem_cgroup_uncharge_start(void);
  75 extern void mem_cgroup_uncharge_end(void);
  76
  77 extern void mem_cgroup_uncharge_page(struct page *page);
  78 extern void mem_cgroup_uncharge_cache_page(struct page *page);
  79
  80 extern void mem_cgroup_out_of_memory(struct mem_cgroup *memcg, gfp_t gfp_mask);
  81 int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *memcg);
  82
  83 extern struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page);
  84 extern struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p);
  85 extern struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm);
  86
  87 extern struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg);
  88 extern struct mem_cgroup *mem_cgroup_from_cont(struct cgroup *cont);
  89
  90 static inline
  91 int mm_match_cgroup(const struct mm_struct *mm, const struct mem_cgroup *cgroup)
  92 {
  93         struct mem_cgroup *memcg;
  94         rcu_read_lock();
  95         memcg = mem_cgroup_from_task(rcu_dereference((mm)->owner));
  96         rcu_read_unlock();
  97         return cgroup == memcg;
  98 }
  99
 100 extern struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *memcg);
 101
 102 extern int
 103 mem_cgroup_prepare_migration(struct page *page,
 104         struct page *newpage, struct mem_cgroup **memcgp, gfp_t gfp_mask);
 105 extern void mem_cgroup_end_migration(struct mem_cgroup *memcg,
 106         struct page *oldpage, struct page *newpage, bool migration_ok);
 107
 108 struct mem_cgroup *mem_cgroup_iter(struct mem_cgroup *,
 109                                    struct mem_cgroup *,
 110                                    struct mem_cgroup_reclaim_cookie *);
 111 void mem_cgroup_iter_break(struct mem_cgroup *, struct mem_cgroup *);
 112
 113 /*
 114  * For memory reclaim.
 115  */
 116 int mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg,
 117                                     struct zone *zone);
 118 int mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg,
 119                                     struct zone *zone);
 120 int mem_cgroup_select_victim_node(struct mem_cgroup *memcg);
 121 unsigned long mem_cgroup_zone_nr_lru_pages(struct mem_cgroup *memcg,
 122                                         int nid, int zid, unsigned int lrumask);
 123 struct zone_reclaim_stat *mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg,
 124                                                       struct zone *zone);
 125 struct zone_reclaim_stat*
 126 mem_cgroup_get_reclaim_stat_from_page(struct page *page);
 127 extern void mem_cgroup_print_oom_info(struct mem_cgroup *memcg,
 128                                         struct task_struct *p);
 129 extern void mem_cgroup_replace_page_cache(struct page *oldpage,
 130                                         struct page *newpage);
 131
 132 extern void mem_cgroup_reset_owner(struct page *page);
 133 #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
 134 extern int do_swap_account;
 135 #endif
 136
 137 static inline bool mem_cgroup_disabled(void)
 138 {
 139         if (mem_cgroup_subsys.disabled)
 140                 return true;
 141         return false;
 142 }
 143
 144 void mem_cgroup_update_page_stat(struct page *page,
 145                                  enum mem_cgroup_page_stat_item idx,
 146                                  int val);
 147
 148 static inline void mem_cgroup_inc_page_stat(struct page *page,
 149                                             enum mem_cgroup_page_stat_item idx)
 150 {
 151         mem_cgroup_update_page_stat(page, idx, 1);
 152 }
 153
 154 static inline void mem_cgroup_dec_page_stat(struct page *page,
 155                                             enum mem_cgroup_page_stat_item idx)
 156 {
 157         mem_cgroup_update_page_stat(page, idx, -1);
 158 }
 159
 160 unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
 161                                                 gfp_t gfp_mask,
 162                                                 unsigned long *total_scanned);
 163 u64 mem_cgroup_get_limit(struct mem_cgroup *memcg);
 164
 165 void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx);
 166 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 167 void mem_cgroup_split_huge_fixup(struct page *head);
 168 #endif
 169
 170 #ifdef CONFIG_DEBUG_VM
 171 bool mem_cgroup_bad_page_check(struct page *page);
 172 void mem_cgroup_print_bad_page(struct page *page);
 173 #endif
 174 #else /* CONFIG_CGROUP_MEM_RES_CTLR */
 175 struct mem_cgroup;
 176
 177 static inline int mem_cgroup_newpage_charge(struct page *page,
 178                                         struct mm_struct *mm, gfp_t gfp_mask)
 179 {
 180         return 0;
 181 }
 182
 183 static inline int mem_cgroup_cache_charge(struct page *page,
 184                                         struct mm_struct *mm, gfp_t gfp_mask)
 185 {
 186         return 0;
 187 }
 188
 189 static inline int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
 190                 struct page *page, gfp_t gfp_mask, struct mem_cgroup **memcgp)
 191 {
 192         return 0;
 193 }
 194
 195 static inline void mem_cgroup_commit_charge_swapin(struct page *page,
 196                                           struct mem_cgroup *memcg)
 197 {
 198 }
 199
 200 static inline void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *memcg)
 201 {
 202 }
 203
 204 static inline void mem_cgroup_uncharge_start(void)
 205 {
 206 }
 207
 208 static inline void mem_cgroup_uncharge_end(void)
 209 {
 210 }
 211
 212 static inline void mem_cgroup_uncharge_page(struct page *page)
 213 {
 214 }
 215
 216 static inline void mem_cgroup_uncharge_cache_page(struct page *page)
 217 {
 218 }
 219
 220 static inline struct lruvec *mem_cgroup_zone_lruvec(struct zone *zone,
 221                                                     struct mem_cgroup *memcg)
 222 {
 223         return &zone->lruvec;
 224 }
 225
 226 static inline struct lruvec *mem_cgroup_lru_add_list(struct zone *zone,
 227                                                      struct page *page,
 228                                                      enum lru_list lru)
 229 {
 230         return &zone->lruvec;
 231 }
 232
 233 static inline void mem_cgroup_lru_del_list(struct page *page, enum lru_list lru)
 234 {
 235 }
 236
 237 static inline void mem_cgroup_lru_del(struct page *page)
 238 {
 239 }
 240
 241 static inline struct lruvec *mem_cgroup_lru_move_lists(struct zone *zone,
 242                                                        struct page *page,
 243                                                        enum lru_list from,
 244                                                        enum lru_list to)
 245 {
 246         return &zone->lruvec;
 247 }
 248
 249 static inline struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page)
 250 {
 251         return NULL;
 252 }
 253
 254 static inline struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm)
 255 {
 256         return NULL;
 257 }
 258
 259 static inline int mm_match_cgroup(struct mm_struct *mm,
 260                 struct mem_cgroup *memcg)
 261 {
 262         return 1;
 263 }
 264
 265 static inline int task_in_mem_cgroup(struct task_struct *task,
 266                                      const struct mem_cgroup *memcg)
 267 {
 268         return 1;
 269 }
 270
 271 static inline struct cgroup_subsys_state
 272                 *mem_cgroup_css(struct mem_cgroup *memcg)
 273 {
 274         return NULL;
 275 }
 276
 277 static inline int
 278 mem_cgroup_prepare_migration(struct page *page, struct page *newpage,
 279         struct mem_cgroup **memcgp, gfp_t gfp_mask)
 280 {
 281         return 0;
 282 }
 283
 284 static inline void mem_cgroup_end_migration(struct mem_cgroup *memcg,
 285                 struct page *oldpage, struct page *newpage, bool migration_ok)
 286 {
 287 }
 288
 289 static inline struct mem_cgroup *
 290 mem_cgroup_iter(struct mem_cgroup *root,
 291                 struct mem_cgroup *prev,
 292                 struct mem_cgroup_reclaim_cookie *reclaim)
 293 {
 294         return NULL;
 295 }
 296
 297 static inline void mem_cgroup_iter_break(struct mem_cgroup *root,
 298                                          struct mem_cgroup *prev)
 299 {
 300 }
 301
 302 static inline int mem_cgroup_get_reclaim_priority(struct mem_cgroup *memcg)
 303 {
 304         return 0;
 305 }
 306
 307 static inline void mem_cgroup_note_reclaim_priority(struct mem_cgroup *memcg,
 308                                                 int priority)
 309 {
 310 }
 311
 312 static inline void mem_cgroup_record_reclaim_priority(struct mem_cgroup *memcg,
 313                                                 int priority)
 314 {
 315 }
 316
 317 static inline bool mem_cgroup_disabled(void)
 318 {
 319         return true;
 320 }
 321
 322 static inline int
 323 mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg, struct zone *zone)
 324 {
 325         return 1;
 326 }
 327
 328 static inline int
 329 mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg, struct zone *zone)
 330 {
 331         return 1;
 332 }
 333
 334 static inline unsigned long
 335 mem_cgroup_zone_nr_lru_pages(struct mem_cgroup *memcg, int nid, int zid,
 336                                 unsigned int lru_mask)
 337 {
 338         return 0;
 339 }
 340
 341
 342 static inline struct zone_reclaim_stat*
 343 mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg, struct zone *zone)
 344 {
 345         return NULL;
 346 }
 347
 348 static inline struct zone_reclaim_stat*
 349 mem_cgroup_get_reclaim_stat_from_page(struct page *page)
 350 {
 351         return NULL;
 352 }
 353
 354 static inline void
 355 mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
 356 {
 357 }
 358
 359 static inline void mem_cgroup_inc_page_stat(struct page *page,
 360                                             enum mem_cgroup_page_stat_item idx)
 361 {
 362 }
 363
 364 static inline void mem_cgroup_dec_page_stat(struct page *page,
 365                                             enum mem_cgroup_page_stat_item idx)
 366 {
 367 }
 368
 369 static inline
 370 unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
 371                                             gfp_t gfp_mask,
 372                                             unsigned long *total_scanned)
 373 {
 374         return 0;
 375 }
 376
 377 static inline
 378 u64 mem_cgroup_get_limit(struct mem_cgroup *memcg)
 379 {
 380         return 0;
 381 }
 382
 383 static inline void mem_cgroup_split_huge_fixup(struct page *head)
 384 {
 385 }
 386
 387 static inline
 388 void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx)
 389 {
 390 }
 391 static inline void mem_cgroup_replace_page_cache(struct page *oldpage,
 392                                 struct page *newpage)
 393 {
 394 }
 395
 396 static inline void mem_cgroup_reset_owner(struct page *page)
 397 {
 398 }
 399 #endif /* CONFIG_CGROUP_MEM_CONT */
 400
 401 #if !defined(CONFIG_CGROUP_MEM_RES_CTLR) || !defined(CONFIG_DEBUG_VM)
 402 static inline bool
 403 mem_cgroup_bad_page_check(struct page *page)
 404 {
 405         return false;
 406 }
 407
 408 static inline void
 409 mem_cgroup_print_bad_page(struct page *page)
 410 {
 411 }
 412 #endif
 413
 414 enum {
 415         UNDER_LIMIT,
 416         SOFT_LIMIT,
 417         OVER_LIMIT,
 418 };
 419
 420 struct sock;
 421 #ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
 422 void sock_update_memcg(struct sock *sk);
 423 void sock_release_memcg(struct sock *sk);
 424 #else
 425 static inline void sock_update_memcg(struct sock *sk)
 426 {
 427 }
 428 static inline void sock_release_memcg(struct sock *sk)
 429 {
 430 }
 431 #endif /* CONFIG_CGROUP_MEM_RES_CTLR_KMEM */
 432 #endif /* _LINUX_MEMCONTROL_H */
 433