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