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_reclaimable_page(struct page *page);
  66 extern void mem_cgroup_rotate_lru_list(struct page *page, enum lru_list lru);
  67 extern void mem_cgroup_del_lru(struct page *page);
  68 extern void mem_cgroup_move_lists(struct page *page,
  69                                   enum lru_list from, enum lru_list to);
  70
  71 /* For coalescing uncharge for reducing memcg' overhead*/
  72 extern void mem_cgroup_uncharge_start(void);
  73 extern void mem_cgroup_uncharge_end(void);
  74
  75 extern void mem_cgroup_uncharge_page(struct page *page);
  76 extern void mem_cgroup_uncharge_cache_page(struct page *page);
  77 extern int mem_cgroup_shmem_charge_fallback(struct page *page,
  78                         struct mm_struct *mm, gfp_t gfp_mask);
  79
  80 extern void mem_cgroup_out_of_memory(struct mem_cgroup *mem, gfp_t gfp_mask);
  81 int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem);
  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
  86 static inline
  87 int mm_match_cgroup(const struct mm_struct *mm, const struct mem_cgroup *cgroup)
  88 {
  89         struct mem_cgroup *mem;
  90         rcu_read_lock();
  91         mem = mem_cgroup_from_task(rcu_dereference((mm)->owner));
  92         rcu_read_unlock();
  93         return cgroup == mem;
  94 }
  95
  96 extern struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *mem);
  97
  98 extern int
  99 mem_cgroup_prepare_migration(struct page *page,
 100         struct page *newpage, struct mem_cgroup **ptr, gfp_t gfp_mask);
 101 extern void mem_cgroup_end_migration(struct mem_cgroup *mem,
 102         struct page *oldpage, struct page *newpage, bool migration_ok);
 103
 104 /*
 105  * For memory reclaim.
 106  */
 107 int mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg);
 108 int mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg);
 109 int mem_cgroup_select_victim_node(struct mem_cgroup *memcg);
 110 unsigned long mem_cgroup_zone_nr_lru_pages(struct mem_cgroup *memcg,
 111                                                 struct zone *zone,
 112                                                 enum lru_list lru);
 113 struct zone_reclaim_stat *mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg,
 114                                                       struct zone *zone);
 115 struct zone_reclaim_stat*
 116 mem_cgroup_get_reclaim_stat_from_page(struct page *page);
 117 extern void mem_cgroup_print_oom_info(struct mem_cgroup *memcg,
 118                                         struct task_struct *p);
 119
 120 #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
 121 extern int do_swap_account;
 122 #endif
 123
 124 static inline bool mem_cgroup_disabled(void)
 125 {
 126         if (mem_cgroup_subsys.disabled)
 127                 return true;
 128         return false;
 129 }
 130
 131 void mem_cgroup_update_page_stat(struct page *page,
 132                                  enum mem_cgroup_page_stat_item idx,
 133                                  int val);
 134
 135 static inline void mem_cgroup_inc_page_stat(struct page *page,
 136                                             enum mem_cgroup_page_stat_item idx)
 137 {
 138         mem_cgroup_update_page_stat(page, idx, 1);
 139 }
 140
 141 static inline void mem_cgroup_dec_page_stat(struct page *page,
 142                                             enum mem_cgroup_page_stat_item idx)
 143 {
 144         mem_cgroup_update_page_stat(page, idx, -1);
 145 }
 146
 147 unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
 148                                                 gfp_t gfp_mask,
 149                                                 unsigned long *total_scanned);
 150 u64 mem_cgroup_get_limit(struct mem_cgroup *mem);
 151
 152 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 153 void mem_cgroup_split_huge_fixup(struct page *head, struct page *tail);
 154 #endif
 155
 156 #ifdef CONFIG_DEBUG_VM
 157 bool mem_cgroup_bad_page_check(struct page *page);
 158 void mem_cgroup_print_bad_page(struct page *page);
 159 #endif
 160 #else /* CONFIG_CGROUP_MEM_RES_CTLR */
 161 struct mem_cgroup;
 162
 163 static inline int mem_cgroup_newpage_charge(struct page *page,
 164                                         struct mm_struct *mm, gfp_t gfp_mask)
 165 {
 166         return 0;
 167 }
 168
 169 static inline int mem_cgroup_cache_charge(struct page *page,
 170                                         struct mm_struct *mm, gfp_t gfp_mask)
 171 {
 172         return 0;
 173 }
 174
 175 static inline int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
 176                 struct page *page, gfp_t gfp_mask, struct mem_cgroup **ptr)
 177 {
 178         return 0;
 179 }
 180
 181 static inline void mem_cgroup_commit_charge_swapin(struct page *page,
 182                                           struct mem_cgroup *ptr)
 183 {
 184 }
 185
 186 static inline void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr)
 187 {
 188 }
 189
 190 static inline void mem_cgroup_uncharge_start(void)
 191 {
 192 }
 193
 194 static inline void mem_cgroup_uncharge_end(void)
 195 {
 196 }
 197
 198 static inline void mem_cgroup_uncharge_page(struct page *page)
 199 {
 200 }
 201
 202 static inline void mem_cgroup_uncharge_cache_page(struct page *page)
 203 {
 204 }
 205
 206 static inline int mem_cgroup_shmem_charge_fallback(struct page *page,
 207                         struct mm_struct *mm, gfp_t gfp_mask)
 208 {
 209         return 0;
 210 }
 211
 212 static inline void mem_cgroup_add_lru_list(struct page *page, int lru)
 213 {
 214 }
 215
 216 static inline void mem_cgroup_del_lru_list(struct page *page, int lru)
 217 {
 218         return ;
 219 }
 220
 221 static inline void mem_cgroup_rotate_reclaimable_page(struct page *page)
 222 {
 223         return ;
 224 }
 225
 226 static inline void mem_cgroup_rotate_lru_list(struct page *page, int lru)
 227 {
 228         return ;
 229 }
 230
 231 static inline void mem_cgroup_del_lru(struct page *page)
 232 {
 233         return ;
 234 }
 235
 236 static inline void
 237 mem_cgroup_move_lists(struct page *page, enum lru_list from, enum lru_list to)
 238 {
 239 }
 240
 241 static inline struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page)
 242 {
 243         return NULL;
 244 }
 245
 246 static inline int mm_match_cgroup(struct mm_struct *mm, struct mem_cgroup *mem)
 247 {
 248         return 1;
 249 }
 250
 251 static inline int task_in_mem_cgroup(struct task_struct *task,
 252                                      const struct mem_cgroup *mem)
 253 {
 254         return 1;
 255 }
 256
 257 static inline struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *mem)
 258 {
 259         return NULL;
 260 }
 261
 262 static inline int
 263 mem_cgroup_prepare_migration(struct page *page, struct page *newpage,
 264         struct mem_cgroup **ptr, gfp_t gfp_mask)
 265 {
 266         return 0;
 267 }
 268
 269 static inline void mem_cgroup_end_migration(struct mem_cgroup *mem,
 270                 struct page *oldpage, struct page *newpage, bool migration_ok)
 271 {
 272 }
 273
 274 static inline int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem)
 275 {
 276         return 0;
 277 }
 278
 279 static inline void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem,
 280                                                 int priority)
 281 {
 282 }
 283
 284 static inline void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem,
 285                                                 int priority)
 286 {
 287 }
 288
 289 static inline bool mem_cgroup_disabled(void)
 290 {
 291         return true;
 292 }
 293
 294 static inline int
 295 mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg)
 296 {
 297         return 1;
 298 }
 299
 300 static inline int
 301 mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg)
 302 {
 303         return 1;
 304 }
 305
 306 static inline unsigned long
 307 mem_cgroup_zone_nr_lru_pages(struct mem_cgroup *memcg, struct zone *zone,
 308                              enum lru_list lru)
 309 {
 310         return 0;
 311 }
 312
 313
 314 static inline struct zone_reclaim_stat*
 315 mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg, struct zone *zone)
 316 {
 317         return NULL;
 318 }
 319
 320 static inline struct zone_reclaim_stat*
 321 mem_cgroup_get_reclaim_stat_from_page(struct page *page)
 322 {
 323         return NULL;
 324 }
 325
 326 static inline void
 327 mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
 328 {
 329 }
 330
 331 static inline void mem_cgroup_inc_page_stat(struct page *page,
 332                                             enum mem_cgroup_page_stat_item idx)
 333 {
 334 }
 335
 336 static inline void mem_cgroup_dec_page_stat(struct page *page,
 337                                             enum mem_cgroup_page_stat_item idx)
 338 {
 339 }
 340
 341 static inline
 342 unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
 343                                             gfp_t gfp_mask,
 344                                             unsigned long *total_scanned)
 345 {
 346         return 0;
 347 }
 348
 349 static inline
 350 u64 mem_cgroup_get_limit(struct mem_cgroup *mem)
 351 {
 352         return 0;
 353 }
 354
 355 static inline void mem_cgroup_split_huge_fixup(struct page *head,
 356                                                 struct page *tail)
 357 {
 358 }
 359
 360 #endif /* CONFIG_CGROUP_MEM_CONT */
 361
 362 #if !defined(CONFIG_CGROUP_MEM_RES_CTLR) || !defined(CONFIG_DEBUG_VM)
 363 static inline bool
 364 mem_cgroup_bad_page_check(struct page *page)
 365 {
 366         return false;
 367 }
 368
 369 static inline void
 370 mem_cgroup_print_bad_page(struct page *page)
 371 {
 372 }
 373 #endif
 374
 375 #endif /* _LINUX_MEMCONTROL_H */
 376