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 extern int mem_cgroup_shmem_charge_fallback(struct page *page,
  80                         struct mm_struct *mm, gfp_t gfp_mask);
  81
  82 extern void mem_cgroup_out_of_memory(struct mem_cgroup *mem, gfp_t gfp_mask);
  83 int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem);
  84
  85 extern struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page);
  86 extern struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p);
  87 extern struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm);
  88
  89 static inline
  90 int mm_match_cgroup(const struct mm_struct *mm, const struct mem_cgroup *cgroup)
  91 {
  92         struct mem_cgroup *mem;
  93         rcu_read_lock();
  94         mem = mem_cgroup_from_task(rcu_dereference((mm)->owner));
  95         rcu_read_unlock();
  96         return cgroup == mem;
  97 }
  98
  99 extern struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *mem);
 100
 101 extern int
 102 mem_cgroup_prepare_migration(struct page *page,
 103         struct page *newpage, struct mem_cgroup **ptr, gfp_t gfp_mask);
 104 extern void mem_cgroup_end_migration(struct mem_cgroup *mem,
 105         struct page *oldpage, struct page *newpage, bool migration_ok);
 106
 107 /*
 108  * For memory reclaim.
 109  */
 110 int mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg);
 111 int mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg);
 112 int mem_cgroup_select_victim_node(struct mem_cgroup *memcg);
 113 unsigned long mem_cgroup_zone_nr_lru_pages(struct mem_cgroup *memcg,
 114                                                 struct zone *zone,
 115                                                 enum lru_list lru);
 116 struct zone_reclaim_stat *mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg,
 117                                                       struct zone *zone);
 118 struct zone_reclaim_stat*
 119 mem_cgroup_get_reclaim_stat_from_page(struct page *page);
 120 extern void mem_cgroup_print_oom_info(struct mem_cgroup *memcg,
 121                                         struct task_struct *p);
 122 extern void mem_cgroup_replace_page_cache(struct page *oldpage,
 123                                         struct page *newpage);
 124
 125 #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
 126 extern int do_swap_account;
 127 #endif
 128
 129 static inline bool mem_cgroup_disabled(void)
 130 {
 131         if (mem_cgroup_subsys.disabled)
 132                 return true;
 133         return false;
 134 }
 135
 136 void mem_cgroup_update_page_stat(struct page *page,
 137                                  enum mem_cgroup_page_stat_item idx,
 138                                  int val);
 139
 140 static inline void mem_cgroup_inc_page_stat(struct page *page,
 141                                             enum mem_cgroup_page_stat_item idx)
 142 {
 143         mem_cgroup_update_page_stat(page, idx, 1);
 144 }
 145
 146 static inline void mem_cgroup_dec_page_stat(struct page *page,
 147                                             enum mem_cgroup_page_stat_item idx)
 148 {
 149         mem_cgroup_update_page_stat(page, idx, -1);
 150 }
 151
 152 unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
 153                                                 gfp_t gfp_mask,
 154                                                 unsigned long *total_scanned);
 155 u64 mem_cgroup_get_limit(struct mem_cgroup *mem);
 156
 157 void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx);
 158 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 159 void mem_cgroup_split_huge_fixup(struct page *head, struct page *tail);
 160 #endif
 161
 162 #ifdef CONFIG_DEBUG_VM
 163 bool mem_cgroup_bad_page_check(struct page *page);
 164 void mem_cgroup_print_bad_page(struct page *page);
 165 #endif
 166 #else /* CONFIG_CGROUP_MEM_RES_CTLR */
 167 struct mem_cgroup;
 168
 169 static inline int mem_cgroup_newpage_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_cache_charge(struct page *page,
 176                                         struct mm_struct *mm, gfp_t gfp_mask)
 177 {
 178         return 0;
 179 }
 180
 181 static inline int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
 182                 struct page *page, gfp_t gfp_mask, struct mem_cgroup **ptr)
 183 {
 184         return 0;
 185 }
 186
 187 static inline void mem_cgroup_commit_charge_swapin(struct page *page,
 188                                           struct mem_cgroup *ptr)
 189 {
 190 }
 191
 192 static inline void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr)
 193 {
 194 }
 195
 196 static inline void mem_cgroup_uncharge_start(void)
 197 {
 198 }
 199
 200 static inline void mem_cgroup_uncharge_end(void)
 201 {
 202 }
 203
 204 static inline void mem_cgroup_uncharge_page(struct page *page)
 205 {
 206 }
 207
 208 static inline void mem_cgroup_uncharge_cache_page(struct page *page)
 209 {
 210 }
 211
 212 static inline int mem_cgroup_shmem_charge_fallback(struct page *page,
 213                         struct mm_struct *mm, gfp_t gfp_mask)
 214 {
 215         return 0;
 216 }
 217
 218 static inline void mem_cgroup_add_lru_list(struct page *page, int lru)
 219 {
 220 }
 221
 222 static inline void mem_cgroup_del_lru_list(struct page *page, int lru)
 223 {
 224         return ;
 225 }
 226
 227 static inline void mem_cgroup_rotate_reclaimable_page(struct page *page)
 228 {
 229         return ;
 230 }
 231
 232 static inline void mem_cgroup_rotate_lru_list(struct page *page, int lru)
 233 {
 234         return ;
 235 }
 236
 237 static inline void mem_cgroup_del_lru(struct page *page)
 238 {
 239         return ;
 240 }
 241
 242 static inline void
 243 mem_cgroup_move_lists(struct page *page, enum lru_list from, enum lru_list to)
 244 {
 245 }
 246
 247 static inline struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page)
 248 {
 249         return NULL;
 250 }
 251
 252 static inline struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm)
 253 {
 254         return NULL;
 255 }
 256
 257 static inline int mm_match_cgroup(struct mm_struct *mm, struct mem_cgroup *mem)
 258 {
 259         return 1;
 260 }
 261
 262 static inline int task_in_mem_cgroup(struct task_struct *task,
 263                                      const struct mem_cgroup *mem)
 264 {
 265         return 1;
 266 }
 267
 268 static inline struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *mem)
 269 {
 270         return NULL;
 271 }
 272
 273 static inline int
 274 mem_cgroup_prepare_migration(struct page *page, struct page *newpage,
 275         struct mem_cgroup **ptr, gfp_t gfp_mask)
 276 {
 277         return 0;
 278 }
 279
 280 static inline void mem_cgroup_end_migration(struct mem_cgroup *mem,
 281                 struct page *oldpage, struct page *newpage, bool migration_ok)
 282 {
 283 }
 284
 285 static inline int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem)
 286 {
 287         return 0;
 288 }
 289
 290 static inline void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem,
 291                                                 int priority)
 292 {
 293 }
 294
 295 static inline void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem,
 296                                                 int priority)
 297 {
 298 }
 299
 300 static inline bool mem_cgroup_disabled(void)
 301 {
 302         return true;
 303 }
 304
 305 static inline int
 306 mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg)
 307 {
 308         return 1;
 309 }
 310
 311 static inline int
 312 mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg)
 313 {
 314         return 1;
 315 }
 316
 317 static inline unsigned long
 318 mem_cgroup_zone_nr_lru_pages(struct mem_cgroup *memcg, struct zone *zone,
 319                              enum lru_list lru)
 320 {
 321         return 0;
 322 }
 323
 324
 325 static inline struct zone_reclaim_stat*
 326 mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg, struct zone *zone)
 327 {
 328         return NULL;
 329 }
 330
 331 static inline struct zone_reclaim_stat*
 332 mem_cgroup_get_reclaim_stat_from_page(struct page *page)
 333 {
 334         return NULL;
 335 }
 336
 337 static inline void
 338 mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
 339 {
 340 }
 341
 342 static inline void mem_cgroup_inc_page_stat(struct page *page,
 343                                             enum mem_cgroup_page_stat_item idx)
 344 {
 345 }
 346
 347 static inline void mem_cgroup_dec_page_stat(struct page *page,
 348                                             enum mem_cgroup_page_stat_item idx)
 349 {
 350 }
 351
 352 static inline
 353 unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
 354                                             gfp_t gfp_mask,
 355                                             unsigned long *total_scanned)
 356 {
 357         return 0;
 358 }
 359
 360 static inline
 361 u64 mem_cgroup_get_limit(struct mem_cgroup *mem)
 362 {
 363         return 0;
 364 }
 365
 366 static inline void mem_cgroup_split_huge_fixup(struct page *head,
 367                                                 struct page *tail)
 368 {
 369 }
 370
 371 static inline
 372 void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx)
 373 {
 374 }
 375 static inline void mem_cgroup_replace_page_cache(struct page *oldpage,
 376                                 struct page *newpage)
 377 {
 378 }
 379 #endif /* CONFIG_CGROUP_MEM_CONT */
 380
 381 #if !defined(CONFIG_CGROUP_MEM_RES_CTLR) || !defined(CONFIG_DEBUG_VM)
 382 static inline bool
 383 mem_cgroup_bad_page_check(struct page *page)
 384 {
 385         return false;
 386 }
 387
 388 static inline void
 389 mem_cgroup_print_bad_page(struct page *page)
 390 {
 391 }
 392 #endif
 393
 394 #endif /* _LINUX_MEMCONTROL_H */
 395