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 extern unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,
  36                                         struct list_head *dst,
  37                                         unsigned long *scanned, int order,
  38                                         int mode, struct zone *z,
  39                                         struct mem_cgroup *mem_cont,
  40                                         int active, int file);
  41
  42 #ifdef CONFIG_CGROUP_MEM_RES_CTLR
  43 /*
  44  * All "charge" functions with gfp_mask should use GFP_KERNEL or
  45  * (gfp_mask & GFP_RECLAIM_MASK). In current implementatin, memcg doesn't
  46  * alloc memory but reclaims memory from all available zones. So, "where I want
  47  * memory from" bits of gfp_mask has no meaning. So any bits of that field is
  48  * available but adding a rule is better. charge functions' gfp_mask should
  49  * be set to GFP_KERNEL or gfp_mask & GFP_RECLAIM_MASK for avoiding ambiguous
  50  * codes.
  51  * (Of course, if memcg does memory allocation in future, GFP_KERNEL is sane.)
  52  */
  53
  54 extern int mem_cgroup_newpage_charge(struct page *page, struct mm_struct *mm,
  55                                 gfp_t gfp_mask);
  56 /* for swap handling */
  57 extern int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
  58                 struct page *page, gfp_t mask, struct mem_cgroup **ptr);
  59 extern void mem_cgroup_commit_charge_swapin(struct page *page,
  60                                         struct mem_cgroup *ptr);
  61 extern void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr);
  62
  63 extern int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
  64                                         gfp_t gfp_mask);
  65 extern void mem_cgroup_add_lru_list(struct page *page, enum lru_list lru);
  66 extern void mem_cgroup_del_lru_list(struct page *page, enum lru_list lru);
  67 extern void mem_cgroup_rotate_reclaimable_page(struct page *page);
  68 extern void mem_cgroup_rotate_lru_list(struct page *page, enum lru_list lru);
  69 extern void mem_cgroup_del_lru(struct page *page);
  70 extern void mem_cgroup_move_lists(struct page *page,
  71                                   enum lru_list from, enum lru_list to);
  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 *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 extern struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm);
  86
  87 static inline
  88 int mm_match_cgroup(const struct mm_struct *mm, const struct mem_cgroup *cgroup)
  89 {
  90         struct mem_cgroup *mem;
  91         rcu_read_lock();
  92         mem = mem_cgroup_from_task(rcu_dereference((mm)->owner));
  93         rcu_read_unlock();
  94         return cgroup == mem;
  95 }
  96
  97 extern struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *mem);
  98
  99 extern int
 100 mem_cgroup_prepare_migration(struct page *page,
 101         struct page *newpage, struct mem_cgroup **ptr, gfp_t gfp_mask);
 102 extern void mem_cgroup_end_migration(struct mem_cgroup *mem,
 103         struct page *oldpage, struct page *newpage, bool migration_ok);
 104
 105 /*
 106  * For memory reclaim.
 107  */
 108 int mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg);
 109 int mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg);
 110 int mem_cgroup_select_victim_node(struct mem_cgroup *memcg);
 111 unsigned long mem_cgroup_zone_nr_lru_pages(struct mem_cgroup *memcg,
 112                                         int nid, int zid, unsigned int lrumask);
 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 void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx);
 153 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 154 void mem_cgroup_split_huge_fixup(struct page *head, struct page *tail);
 155 #endif
 156
 157 #ifdef CONFIG_DEBUG_VM
 158 bool mem_cgroup_bad_page_check(struct page *page);
 159 void mem_cgroup_print_bad_page(struct page *page);
 160 #endif
 161 #else /* CONFIG_CGROUP_MEM_RES_CTLR */
 162 struct mem_cgroup;
 163
 164 static inline int mem_cgroup_newpage_charge(struct page *page,
 165                                         struct mm_struct *mm, gfp_t gfp_mask)
 166 {
 167         return 0;
 168 }
 169
 170 static inline int mem_cgroup_cache_charge(struct page *page,
 171                                         struct mm_struct *mm, gfp_t gfp_mask)
 172 {
 173         return 0;
 174 }
 175
 176 static inline int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
 177                 struct page *page, gfp_t gfp_mask, struct mem_cgroup **ptr)
 178 {
 179         return 0;
 180 }
 181
 182 static inline void mem_cgroup_commit_charge_swapin(struct page *page,
 183                                           struct mem_cgroup *ptr)
 184 {
 185 }
 186
 187 static inline void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr)
 188 {
 189 }
 190
 191 static inline void mem_cgroup_uncharge_start(void)
 192 {
 193 }
 194
 195 static inline void mem_cgroup_uncharge_end(void)
 196 {
 197 }
 198
 199 static inline void mem_cgroup_uncharge_page(struct page *page)
 200 {
 201 }
 202
 203 static inline void mem_cgroup_uncharge_cache_page(struct page *page)
 204 {
 205 }
 206
 207 static inline void mem_cgroup_add_lru_list(struct page *page, int lru)
 208 {
 209 }
 210
 211 static inline void mem_cgroup_del_lru_list(struct page *page, int lru)
 212 {
 213         return ;
 214 }
 215
 216 static inline void mem_cgroup_rotate_reclaimable_page(struct page *page)
 217 {
 218         return ;
 219 }
 220
 221 static inline void mem_cgroup_rotate_lru_list(struct page *page, int lru)
 222 {
 223         return ;
 224 }
 225
 226 static inline void mem_cgroup_del_lru(struct page *page)
 227 {
 228         return ;
 229 }
 230
 231 static inline void
 232 mem_cgroup_move_lists(struct page *page, enum lru_list from, enum lru_list to)
 233 {
 234 }
 235
 236 static inline struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page)
 237 {
 238         return NULL;
 239 }
 240
 241 static inline struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm)
 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, int nid, int zid,
 308                                 unsigned int lru_mask)
 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 static inline
 361 void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx)
 362 {
 363 }
 364 #endif /* CONFIG_CGROUP_MEM_CONT */
 365
 366 #if !defined(CONFIG_CGROUP_MEM_RES_CTLR) || !defined(CONFIG_DEBUG_VM)
 367 static inline bool
 368 mem_cgroup_bad_page_check(struct page *page)
 369 {
 370         return false;
 371 }
 372
 373 static inline void
 374 mem_cgroup_print_bad_page(struct page *page)
 375 {
 376 }
 377 #endif
 378
 379 #endif /* _LINUX_MEMCONTROL_H */
 380