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 #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
 133 extern int do_swap_account;
 134 #endif
 135
 136 static inline bool mem_cgroup_disabled(void)
 137 {
 138         if (mem_cgroup_subsys.disabled)
 139                 return true;
 140         return false;
 141 }
 142
 143 void mem_cgroup_update_page_stat(struct page *page,
 144                                  enum mem_cgroup_page_stat_item idx,
 145                                  int val);
 146
 147 static inline void mem_cgroup_inc_page_stat(struct page *page,
 148                                             enum mem_cgroup_page_stat_item idx)
 149 {
 150         mem_cgroup_update_page_stat(page, idx, 1);
 151 }
 152
 153 static inline void mem_cgroup_dec_page_stat(struct page *page,
 154                                             enum mem_cgroup_page_stat_item idx)
 155 {
 156         mem_cgroup_update_page_stat(page, idx, -1);
 157 }
 158
 159 unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
 160                                                 gfp_t gfp_mask,
 161                                                 unsigned long *total_scanned);
 162 u64 mem_cgroup_get_limit(struct mem_cgroup *memcg);
 163
 164 void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx);
 165 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 166 void mem_cgroup_split_huge_fixup(struct page *head);
 167 #endif
 168
 169 #ifdef CONFIG_DEBUG_VM
 170 bool mem_cgroup_bad_page_check(struct page *page);
 171 void mem_cgroup_print_bad_page(struct page *page);
 172 #endif
 173 #else /* CONFIG_CGROUP_MEM_RES_CTLR */
 174 struct mem_cgroup;
 175
 176 static inline int mem_cgroup_newpage_charge(struct page *page,
 177                                         struct mm_struct *mm, gfp_t gfp_mask)
 178 {
 179         return 0;
 180 }
 181
 182 static inline int mem_cgroup_cache_charge(struct page *page,
 183                                         struct mm_struct *mm, gfp_t gfp_mask)
 184 {
 185         return 0;
 186 }
 187
 188 static inline int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
 189                 struct page *page, gfp_t gfp_mask, struct mem_cgroup **memcgp)
 190 {
 191         return 0;
 192 }
 193
 194 static inline void mem_cgroup_commit_charge_swapin(struct page *page,
 195                                           struct mem_cgroup *memcg)
 196 {
 197 }
 198
 199 static inline void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *memcg)
 200 {
 201 }
 202
 203 static inline void mem_cgroup_uncharge_start(void)
 204 {
 205 }
 206
 207 static inline void mem_cgroup_uncharge_end(void)
 208 {
 209 }
 210
 211 static inline void mem_cgroup_uncharge_page(struct page *page)
 212 {
 213 }
 214
 215 static inline void mem_cgroup_uncharge_cache_page(struct page *page)
 216 {
 217 }
 218
 219 static inline struct lruvec *mem_cgroup_zone_lruvec(struct zone *zone,
 220                                                     struct mem_cgroup *memcg)
 221 {
 222         return &zone->lruvec;
 223 }
 224
 225 static inline struct lruvec *mem_cgroup_lru_add_list(struct zone *zone,
 226                                                      struct page *page,
 227                                                      enum lru_list lru)
 228 {
 229         return &zone->lruvec;
 230 }
 231
 232 static inline void mem_cgroup_lru_del_list(struct page *page, enum lru_list lru)
 233 {
 234 }
 235
 236 static inline void mem_cgroup_lru_del(struct page *page)
 237 {
 238 }
 239
 240 static inline struct lruvec *mem_cgroup_lru_move_lists(struct zone *zone,
 241                                                        struct page *page,
 242                                                        enum lru_list from,
 243                                                        enum lru_list to)
 244 {
 245         return &zone->lruvec;
 246 }
 247
 248 static inline struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page)
 249 {
 250         return NULL;
 251 }
 252
 253 static inline struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm)
 254 {
 255         return NULL;
 256 }
 257
 258 static inline int mm_match_cgroup(struct mm_struct *mm,
 259                 struct mem_cgroup *memcg)
 260 {
 261         return 1;
 262 }
 263
 264 static inline int task_in_mem_cgroup(struct task_struct *task,
 265                                      const struct mem_cgroup *memcg)
 266 {
 267         return 1;
 268 }
 269
 270 static inline struct cgroup_subsys_state
 271                 *mem_cgroup_css(struct mem_cgroup *memcg)
 272 {
 273         return NULL;
 274 }
 275
 276 static inline int
 277 mem_cgroup_prepare_migration(struct page *page, struct page *newpage,
 278         struct mem_cgroup **memcgp, gfp_t gfp_mask)
 279 {
 280         return 0;
 281 }
 282
 283 static inline void mem_cgroup_end_migration(struct mem_cgroup *memcg,
 284                 struct page *oldpage, struct page *newpage, bool migration_ok)
 285 {
 286 }
 287
 288 static inline struct mem_cgroup *
 289 mem_cgroup_iter(struct mem_cgroup *root,
 290                 struct mem_cgroup *prev,
 291                 struct mem_cgroup_reclaim_cookie *reclaim)
 292 {
 293         return NULL;
 294 }
 295
 296 static inline void mem_cgroup_iter_break(struct mem_cgroup *root,
 297                                          struct mem_cgroup *prev)
 298 {
 299 }
 300
 301 static inline int mem_cgroup_get_reclaim_priority(struct mem_cgroup *memcg)
 302 {
 303         return 0;
 304 }
 305
 306 static inline void mem_cgroup_note_reclaim_priority(struct mem_cgroup *memcg,
 307                                                 int priority)
 308 {
 309 }
 310
 311 static inline void mem_cgroup_record_reclaim_priority(struct mem_cgroup *memcg,
 312                                                 int priority)
 313 {
 314 }
 315
 316 static inline bool mem_cgroup_disabled(void)
 317 {
 318         return true;
 319 }
 320
 321 static inline int
 322 mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg, struct zone *zone)
 323 {
 324         return 1;
 325 }
 326
 327 static inline int
 328 mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg, struct zone *zone)
 329 {
 330         return 1;
 331 }
 332
 333 static inline unsigned long
 334 mem_cgroup_zone_nr_lru_pages(struct mem_cgroup *memcg, int nid, int zid,
 335                                 unsigned int lru_mask)
 336 {
 337         return 0;
 338 }
 339
 340
 341 static inline struct zone_reclaim_stat*
 342 mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg, struct zone *zone)
 343 {
 344         return NULL;
 345 }
 346
 347 static inline struct zone_reclaim_stat*
 348 mem_cgroup_get_reclaim_stat_from_page(struct page *page)
 349 {
 350         return NULL;
 351 }
 352
 353 static inline void
 354 mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
 355 {
 356 }
 357
 358 static inline void mem_cgroup_inc_page_stat(struct page *page,
 359                                             enum mem_cgroup_page_stat_item idx)
 360 {
 361 }
 362
 363 static inline void mem_cgroup_dec_page_stat(struct page *page,
 364                                             enum mem_cgroup_page_stat_item idx)
 365 {
 366 }
 367
 368 static inline
 369 unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
 370                                             gfp_t gfp_mask,
 371                                             unsigned long *total_scanned)
 372 {
 373         return 0;
 374 }
 375
 376 static inline
 377 u64 mem_cgroup_get_limit(struct mem_cgroup *memcg)
 378 {
 379         return 0;
 380 }
 381
 382 static inline void mem_cgroup_split_huge_fixup(struct page *head)
 383 {
 384 }
 385
 386 static inline
 387 void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx)
 388 {
 389 }
 390 static inline void mem_cgroup_replace_page_cache(struct page *oldpage,
 391                                 struct page *newpage)
 392 {
 393 }
 394 #endif /* CONFIG_CGROUP_MEM_CONT */
 395
 396 #if !defined(CONFIG_CGROUP_MEM_RES_CTLR) || !defined(CONFIG_DEBUG_VM)
 397 static inline bool
 398 mem_cgroup_bad_page_check(struct page *page)
 399 {
 400         return false;
 401 }
 402
 403 static inline void
 404 mem_cgroup_print_bad_page(struct page *page)
 405 {
 406 }
 407 #endif
 408
 409 enum {
 410         UNDER_LIMIT,
 411         SOFT_LIMIT,
 412         OVER_LIMIT,
 413 };
 414
 415 struct sock;
 416 #ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
 417 void sock_update_memcg(struct sock *sk);
 418 void sock_release_memcg(struct sock *sk);
 419 #else
 420 static inline void sock_update_memcg(struct sock *sk)
 421 {
 422 }
 423 static inline void sock_release_memcg(struct sock *sk)
 424 {
 425 }
 426 #endif /* CONFIG_CGROUP_MEM_RES_CTLR_KMEM */
 427 #endif /* _LINUX_MEMCONTROL_H */
 428