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
  88 static inline
  89 int mm_match_cgroup(const struct mm_struct *mm, const struct mem_cgroup *cgroup)
  90 {
  91         struct mem_cgroup *mem;
  92         rcu_read_lock();
  93         mem = mem_cgroup_from_task(rcu_dereference((mm)->owner));
  94         rcu_read_unlock();
  95         return cgroup == mem;
  96 }
  97
  98 extern struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *mem);
  99
 100 extern int
 101 mem_cgroup_prepare_migration(struct page *page,
 102         struct page *newpage, struct mem_cgroup **ptr, gfp_t gfp_mask);
 103 extern void mem_cgroup_end_migration(struct mem_cgroup *mem,
 104         struct page *oldpage, struct page *newpage, bool migration_ok);
 105
 106 /*
 107  * For memory reclaim.
 108  */
 109 int mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg);
 110 int mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg);
 111 int mem_cgroup_select_victim_node(struct mem_cgroup *memcg);
 112 unsigned long mem_cgroup_zone_nr_lru_pages(struct mem_cgroup *memcg,
 113                                                 struct zone *zone,
 114                                                 enum lru_list lru);
 115 struct zone_reclaim_stat *mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg,
 116                                                       struct zone *zone);
 117 struct zone_reclaim_stat*
 118 mem_cgroup_get_reclaim_stat_from_page(struct page *page);
 119 extern void mem_cgroup_print_oom_info(struct mem_cgroup *memcg,
 120                                         struct task_struct *p);
 121
 122 #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
 123 extern int do_swap_account;
 124 #endif
 125
 126 static inline bool mem_cgroup_disabled(void)
 127 {
 128         if (mem_cgroup_subsys.disabled)
 129                 return true;
 130         return false;
 131 }
 132
 133 void mem_cgroup_update_page_stat(struct page *page,
 134                                  enum mem_cgroup_page_stat_item idx,
 135                                  int val);
 136
 137 static inline void mem_cgroup_inc_page_stat(struct page *page,
 138                                             enum mem_cgroup_page_stat_item idx)
 139 {
 140         mem_cgroup_update_page_stat(page, idx, 1);
 141 }
 142
 143 static inline void mem_cgroup_dec_page_stat(struct page *page,
 144                                             enum mem_cgroup_page_stat_item idx)
 145 {
 146         mem_cgroup_update_page_stat(page, idx, -1);
 147 }
 148
 149 unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
 150                                                 gfp_t gfp_mask,
 151                                                 unsigned long *total_scanned);
 152 u64 mem_cgroup_get_limit(struct mem_cgroup *mem);
 153
 154 void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx);
 155 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 156 void mem_cgroup_split_huge_fixup(struct page *head, struct page *tail);
 157 #endif
 158
 159 #ifdef CONFIG_DEBUG_VM
 160 bool mem_cgroup_bad_page_check(struct page *page);
 161 void mem_cgroup_print_bad_page(struct page *page);
 162 #endif
 163 #else /* CONFIG_CGROUP_MEM_RES_CTLR */
 164 struct mem_cgroup;
 165
 166 static inline int mem_cgroup_newpage_charge(struct page *page,
 167                                         struct mm_struct *mm, gfp_t gfp_mask)
 168 {
 169         return 0;
 170 }
 171
 172 static inline int mem_cgroup_cache_charge(struct page *page,
 173                                         struct mm_struct *mm, gfp_t gfp_mask)
 174 {
 175         return 0;
 176 }
 177
 178 static inline int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
 179                 struct page *page, gfp_t gfp_mask, struct mem_cgroup **ptr)
 180 {
 181         return 0;
 182 }
 183
 184 static inline void mem_cgroup_commit_charge_swapin(struct page *page,
 185                                           struct mem_cgroup *ptr)
 186 {
 187 }
 188
 189 static inline void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr)
 190 {
 191 }
 192
 193 static inline void mem_cgroup_uncharge_start(void)
 194 {
 195 }
 196
 197 static inline void mem_cgroup_uncharge_end(void)
 198 {
 199 }
 200
 201 static inline void mem_cgroup_uncharge_page(struct page *page)
 202 {
 203 }
 204
 205 static inline void mem_cgroup_uncharge_cache_page(struct page *page)
 206 {
 207 }
 208
 209 static inline int mem_cgroup_shmem_charge_fallback(struct page *page,
 210                         struct mm_struct *mm, gfp_t gfp_mask)
 211 {
 212         return 0;
 213 }
 214
 215 static inline void mem_cgroup_add_lru_list(struct page *page, int lru)
 216 {
 217 }
 218
 219 static inline void mem_cgroup_del_lru_list(struct page *page, int lru)
 220 {
 221         return ;
 222 }
 223
 224 static inline void mem_cgroup_rotate_reclaimable_page(struct page *page)
 225 {
 226         return ;
 227 }
 228
 229 static inline void mem_cgroup_rotate_lru_list(struct page *page, int lru)
 230 {
 231         return ;
 232 }
 233
 234 static inline void mem_cgroup_del_lru(struct page *page)
 235 {
 236         return ;
 237 }
 238
 239 static inline void
 240 mem_cgroup_move_lists(struct page *page, enum lru_list from, enum lru_list to)
 241 {
 242 }
 243
 244 static inline struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page)
 245 {
 246         return NULL;
 247 }
 248
 249 static inline int mm_match_cgroup(struct mm_struct *mm, struct mem_cgroup *mem)
 250 {
 251         return 1;
 252 }
 253
 254 static inline int task_in_mem_cgroup(struct task_struct *task,
 255                                      const struct mem_cgroup *mem)
 256 {
 257         return 1;
 258 }
 259
 260 static inline struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *mem)
 261 {
 262         return NULL;
 263 }
 264
 265 static inline int
 266 mem_cgroup_prepare_migration(struct page *page, struct page *newpage,
 267         struct mem_cgroup **ptr, gfp_t gfp_mask)
 268 {
 269         return 0;
 270 }
 271
 272 static inline void mem_cgroup_end_migration(struct mem_cgroup *mem,
 273                 struct page *oldpage, struct page *newpage, bool migration_ok)
 274 {
 275 }
 276
 277 static inline int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem)
 278 {
 279         return 0;
 280 }
 281
 282 static inline void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem,
 283                                                 int priority)
 284 {
 285 }
 286
 287 static inline void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem,
 288                                                 int priority)
 289 {
 290 }
 291
 292 static inline bool mem_cgroup_disabled(void)
 293 {
 294         return true;
 295 }
 296
 297 static inline int
 298 mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg)
 299 {
 300         return 1;
 301 }
 302
 303 static inline int
 304 mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg)
 305 {
 306         return 1;
 307 }
 308
 309 static inline unsigned long
 310 mem_cgroup_zone_nr_lru_pages(struct mem_cgroup *memcg, struct zone *zone,
 311                              enum lru_list lru)
 312 {
 313         return 0;
 314 }
 315
 316
 317 static inline struct zone_reclaim_stat*
 318 mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg, struct zone *zone)
 319 {
 320         return NULL;
 321 }
 322
 323 static inline struct zone_reclaim_stat*
 324 mem_cgroup_get_reclaim_stat_from_page(struct page *page)
 325 {
 326         return NULL;
 327 }
 328
 329 static inline void
 330 mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
 331 {
 332 }
 333
 334 static inline void mem_cgroup_inc_page_stat(struct page *page,
 335                                             enum mem_cgroup_page_stat_item idx)
 336 {
 337 }
 338
 339 static inline void mem_cgroup_dec_page_stat(struct page *page,
 340                                             enum mem_cgroup_page_stat_item idx)
 341 {
 342 }
 343
 344 static inline
 345 unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
 346                                             gfp_t gfp_mask,
 347                                             unsigned long *total_scanned)
 348 {
 349         return 0;
 350 }
 351
 352 static inline
 353 u64 mem_cgroup_get_limit(struct mem_cgroup *mem)
 354 {
 355         return 0;
 356 }
 357
 358 static inline void mem_cgroup_split_huge_fixup(struct page *head,
 359                                                 struct page *tail)
 360 {
 361 }
 362
 363 static inline
 364 void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx)
 365 {
 366 }
 367 #endif /* CONFIG_CGROUP_MEM_CONT */
 368
 369 #if !defined(CONFIG_CGROUP_MEM_RES_CTLR) || !defined(CONFIG_DEBUG_VM)
 370 static inline bool
 371 mem_cgroup_bad_page_check(struct page *page)
 372 {
 373         return false;
 374 }
 375
 376 static inline void
 377 mem_cgroup_print_bad_page(struct page *page)
 378 {
 379 }
 380 #endif
 381
 382 #endif /* _LINUX_MEMCONTROL_H */
 383