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 struct mem_cgroup;
  24 struct page_cgroup;
  25 struct page;
  26 struct mm_struct;
  27
  28 /* Stats that can be updated by kernel. */
  29 enum mem_cgroup_page_stat_item {
  30         MEMCG_NR_FILE_MAPPED, /* # of pages charged as file rss */
  31 };
  32
  33 extern unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,
  34                                         struct list_head *dst,
  35                                         unsigned long *scanned, int order,
  36                                         int mode, struct zone *z,
  37                                         struct mem_cgroup *mem_cont,
  38                                         int active, int file);
  39
  40 #ifdef CONFIG_CGROUP_MEM_RES_CTLR
  41 /*
  42  * All "charge" functions with gfp_mask should use GFP_KERNEL or
  43  * (gfp_mask & GFP_RECLAIM_MASK). In current implementatin, memcg doesn't
  44  * alloc memory but reclaims memory from all available zones. So, "where I want
  45  * memory from" bits of gfp_mask has no meaning. So any bits of that field is
  46  * available but adding a rule is better. charge functions' gfp_mask should
  47  * be set to GFP_KERNEL or gfp_mask & GFP_RECLAIM_MASK for avoiding ambiguous
  48  * codes.
  49  * (Of course, if memcg does memory allocation in future, GFP_KERNEL is sane.)
  50  */
  51
  52 extern int mem_cgroup_newpage_charge(struct page *page, struct mm_struct *mm,
  53                                 gfp_t gfp_mask);
  54 /* for swap handling */
  55 extern int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
  56                 struct page *page, gfp_t mask, struct mem_cgroup **ptr);
  57 extern void mem_cgroup_commit_charge_swapin(struct page *page,
  58                                         struct mem_cgroup *ptr);
  59 extern void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr);
  60
  61 extern int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
  62                                         gfp_t gfp_mask);
  63 extern void mem_cgroup_add_lru_list(struct page *page, enum lru_list lru);
  64 extern void mem_cgroup_del_lru_list(struct page *page, enum lru_list lru);
  65 extern void mem_cgroup_rotate_lru_list(struct page *page, enum lru_list lru);
  66 extern void mem_cgroup_del_lru(struct page *page);
  67 extern void mem_cgroup_move_lists(struct page *page,
  68                                   enum lru_list from, enum lru_list to);
  69
  70 /* For coalescing uncharge for reducing memcg' overhead*/
  71 extern void mem_cgroup_uncharge_start(void);
  72 extern void mem_cgroup_uncharge_end(void);
  73
  74 extern void mem_cgroup_uncharge_page(struct page *page);
  75 extern void mem_cgroup_uncharge_cache_page(struct page *page);
  76 extern int mem_cgroup_shmem_charge_fallback(struct page *page,
  77                         struct mm_struct *mm, gfp_t gfp_mask);
  78
  79 extern void mem_cgroup_out_of_memory(struct mem_cgroup *mem, gfp_t gfp_mask);
  80 int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem);
  81
  82 extern struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page);
  83 extern struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p);
  84
  85 static inline
  86 int mm_match_cgroup(const struct mm_struct *mm, const struct mem_cgroup *cgroup)
  87 {
  88         struct mem_cgroup *mem;
  89         rcu_read_lock();
  90         mem = mem_cgroup_from_task(rcu_dereference((mm)->owner));
  91         rcu_read_unlock();
  92         return cgroup == mem;
  93 }
  94
  95 extern struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *mem);
  96
  97 extern int
  98 mem_cgroup_prepare_migration(struct page *page,
  99         struct page *newpage, struct mem_cgroup **ptr);
 100 extern void mem_cgroup_end_migration(struct mem_cgroup *mem,
 101         struct page *oldpage, struct page *newpage, bool migration_ok);
 102
 103 /*
 104  * For memory reclaim.
 105  */
 106 int mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg);
 107 int mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg);
 108 unsigned long mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg,
 109                                        struct zone *zone,
 110                                        enum lru_list lru);
 111 struct zone_reclaim_stat *mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg,
 112                                                       struct zone *zone);
 113 struct zone_reclaim_stat*
 114 mem_cgroup_get_reclaim_stat_from_page(struct page *page);
 115 extern void mem_cgroup_print_oom_info(struct mem_cgroup *memcg,
 116                                         struct task_struct *p);
 117
 118 #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
 119 extern int do_swap_account;
 120 #endif
 121
 122 static inline bool mem_cgroup_disabled(void)
 123 {
 124         if (mem_cgroup_subsys.disabled)
 125                 return true;
 126         return false;
 127 }
 128
 129 void mem_cgroup_update_page_stat(struct page *page,
 130                                  enum mem_cgroup_page_stat_item idx,
 131                                  int val);
 132
 133 static inline void mem_cgroup_inc_page_stat(struct page *page,
 134                                             enum mem_cgroup_page_stat_item idx)
 135 {
 136         mem_cgroup_update_page_stat(page, idx, 1);
 137 }
 138
 139 static inline void mem_cgroup_dec_page_stat(struct page *page,
 140                                             enum mem_cgroup_page_stat_item idx)
 141 {
 142         mem_cgroup_update_page_stat(page, idx, -1);
 143 }
 144
 145 unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
 146                                                 gfp_t gfp_mask);
 147 u64 mem_cgroup_get_limit(struct mem_cgroup *mem);
 148
 149 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 150 void mem_cgroup_split_huge_fixup(struct page *head, struct page *tail);
 151 #endif
 152
 153 #else /* CONFIG_CGROUP_MEM_RES_CTLR */
 154 struct mem_cgroup;
 155
 156 static inline int mem_cgroup_newpage_charge(struct page *page,
 157                                         struct mm_struct *mm, gfp_t gfp_mask)
 158 {
 159         return 0;
 160 }
 161
 162 static inline int mem_cgroup_cache_charge(struct page *page,
 163                                         struct mm_struct *mm, gfp_t gfp_mask)
 164 {
 165         return 0;
 166 }
 167
 168 static inline int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
 169                 struct page *page, gfp_t gfp_mask, struct mem_cgroup **ptr)
 170 {
 171         return 0;
 172 }
 173
 174 static inline void mem_cgroup_commit_charge_swapin(struct page *page,
 175                                           struct mem_cgroup *ptr)
 176 {
 177 }
 178
 179 static inline void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr)
 180 {
 181 }
 182
 183 static inline void mem_cgroup_uncharge_start(void)
 184 {
 185 }
 186
 187 static inline void mem_cgroup_uncharge_end(void)
 188 {
 189 }
 190
 191 static inline void mem_cgroup_uncharge_page(struct page *page)
 192 {
 193 }
 194
 195 static inline void mem_cgroup_uncharge_cache_page(struct page *page)
 196 {
 197 }
 198
 199 static inline int mem_cgroup_shmem_charge_fallback(struct page *page,
 200                         struct mm_struct *mm, gfp_t gfp_mask)
 201 {
 202         return 0;
 203 }
 204
 205 static inline void mem_cgroup_add_lru_list(struct page *page, int lru)
 206 {
 207 }
 208
 209 static inline void mem_cgroup_del_lru_list(struct page *page, int lru)
 210 {
 211         return ;
 212 }
 213
 214 static inline void mem_cgroup_rotate_lru_list(struct page *page, int lru)
 215 {
 216         return ;
 217 }
 218
 219 static inline void mem_cgroup_del_lru(struct page *page)
 220 {
 221         return ;
 222 }
 223
 224 static inline void
 225 mem_cgroup_move_lists(struct page *page, enum lru_list from, enum lru_list to)
 226 {
 227 }
 228
 229 static inline struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page)
 230 {
 231         return NULL;
 232 }
 233
 234 static inline int mm_match_cgroup(struct mm_struct *mm, struct mem_cgroup *mem)
 235 {
 236         return 1;
 237 }
 238
 239 static inline int task_in_mem_cgroup(struct task_struct *task,
 240                                      const struct mem_cgroup *mem)
 241 {
 242         return 1;
 243 }
 244
 245 static inline struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *mem)
 246 {
 247         return NULL;
 248 }
 249
 250 static inline int
 251 mem_cgroup_prepare_migration(struct page *page, struct page *newpage,
 252         struct mem_cgroup **ptr)
 253 {
 254         return 0;
 255 }
 256
 257 static inline void mem_cgroup_end_migration(struct mem_cgroup *mem,
 258                 struct page *oldpage, struct page *newpage, bool migration_ok)
 259 {
 260 }
 261
 262 static inline int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem)
 263 {
 264         return 0;
 265 }
 266
 267 static inline void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem,
 268                                                 int priority)
 269 {
 270 }
 271
 272 static inline void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem,
 273                                                 int priority)
 274 {
 275 }
 276
 277 static inline bool mem_cgroup_disabled(void)
 278 {
 279         return true;
 280 }
 281
 282 static inline int
 283 mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg)
 284 {
 285         return 1;
 286 }
 287
 288 static inline int
 289 mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg)
 290 {
 291         return 1;
 292 }
 293
 294 static inline unsigned long
 295 mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg, struct zone *zone,
 296                          enum lru_list lru)
 297 {
 298         return 0;
 299 }
 300
 301
 302 static inline struct zone_reclaim_stat*
 303 mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg, struct zone *zone)
 304 {
 305         return NULL;
 306 }
 307
 308 static inline struct zone_reclaim_stat*
 309 mem_cgroup_get_reclaim_stat_from_page(struct page *page)
 310 {
 311         return NULL;
 312 }
 313
 314 static inline void
 315 mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
 316 {
 317 }
 318
 319 static inline void mem_cgroup_inc_page_stat(struct page *page,
 320                                             enum mem_cgroup_page_stat_item idx)
 321 {
 322 }
 323
 324 static inline void mem_cgroup_dec_page_stat(struct page *page,
 325                                             enum mem_cgroup_page_stat_item idx)
 326 {
 327 }
 328
 329 static inline
 330 unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
 331                                             gfp_t gfp_mask)
 332 {
 333         return 0;
 334 }
 335
 336 static inline
 337 u64 mem_cgroup_get_limit(struct mem_cgroup *mem)
 338 {
 339         return 0;
 340 }
 341
 342 static inline void mem_cgroup_split_huge_fixup(struct page *head,
 343                                                 struct page *tail)
 344 {
 345 }
 346
 347 #endif /* CONFIG_CGROUP_MEM_CONT */
 348
 349 #endif /* _LINUX_MEMCONTROL_H */
 350