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                                         isolate_mode_t mode,
  39                                         struct zone *z,
  40                                         struct mem_cgroup *mem_cont,
  41                                         int active, int file);
  42
  43 #ifdef CONFIG_CGROUP_MEM_RES_CTLR
  44 /*
  45  * All "charge" functions with gfp_mask should use GFP_KERNEL or
  46  * (gfp_mask & GFP_RECLAIM_MASK). In current implementatin, memcg doesn't
  47  * alloc memory but reclaims memory from all available zones. So, "where I want
  48  * memory from" bits of gfp_mask has no meaning. So any bits of that field is
  49  * available but adding a rule is better. charge functions' gfp_mask should
  50  * be set to GFP_KERNEL or gfp_mask & GFP_RECLAIM_MASK for avoiding ambiguous
  51  * codes.
  52  * (Of course, if memcg does memory allocation in future, GFP_KERNEL is sane.)
  53  */
  54
  55 extern int mem_cgroup_newpage_charge(struct page *page, struct mm_struct *mm,
  56                                 gfp_t gfp_mask);
  57 /* for swap handling */
  58 extern int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
  59                 struct page *page, gfp_t mask, struct mem_cgroup **ptr);
  60 extern void mem_cgroup_commit_charge_swapin(struct page *page,
  61                                         struct mem_cgroup *ptr);
  62 extern void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr);
  63
  64 extern int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
  65                                         gfp_t gfp_mask);
  66 extern void mem_cgroup_add_lru_list(struct page *page, enum lru_list lru);
  67 extern void mem_cgroup_del_lru_list(struct page *page, enum lru_list lru);
  68 extern void mem_cgroup_rotate_reclaimable_page(struct page *page);
  69 extern void mem_cgroup_rotate_lru_list(struct page *page, enum lru_list lru);
  70 extern void mem_cgroup_del_lru(struct page *page);
  71 extern void mem_cgroup_move_lists(struct page *page,
  72                                   enum lru_list from, enum lru_list to);
  73
  74 /* For coalescing uncharge for reducing memcg' overhead*/
  75 extern void mem_cgroup_uncharge_start(void);
  76 extern void mem_cgroup_uncharge_end(void);
  77
  78 extern void mem_cgroup_uncharge_page(struct page *page);
  79 extern void mem_cgroup_uncharge_cache_page(struct page *page);
  80
  81 extern void mem_cgroup_out_of_memory(struct mem_cgroup *mem, gfp_t gfp_mask);
  82 int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem);
  83
  84 extern struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page);
  85 extern struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p);
  86 extern struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm);
  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                                         int nid, int zid, unsigned int lrumask);
 114 struct zone_reclaim_stat *mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg,
 115                                                       struct zone *zone);
 116 struct zone_reclaim_stat*
 117 mem_cgroup_get_reclaim_stat_from_page(struct page *page);
 118 extern void mem_cgroup_print_oom_info(struct mem_cgroup *memcg,
 119                                         struct task_struct *p);
 120
 121 #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
 122 extern int do_swap_account;
 123 #endif
 124
 125 static inline bool mem_cgroup_disabled(void)
 126 {
 127         if (mem_cgroup_subsys.disabled)
 128                 return true;
 129         return false;
 130 }
 131
 132 void mem_cgroup_update_page_stat(struct page *page,
 133                                  enum mem_cgroup_page_stat_item idx,
 134                                  int val);
 135
 136 static inline void mem_cgroup_inc_page_stat(struct page *page,
 137                                             enum mem_cgroup_page_stat_item idx)
 138 {
 139         mem_cgroup_update_page_stat(page, idx, 1);
 140 }
 141
 142 static inline void mem_cgroup_dec_page_stat(struct page *page,
 143                                             enum mem_cgroup_page_stat_item idx)
 144 {
 145         mem_cgroup_update_page_stat(page, idx, -1);
 146 }
 147
 148 unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
 149                                                 gfp_t gfp_mask,
 150                                                 unsigned long *total_scanned);
 151 u64 mem_cgroup_get_limit(struct mem_cgroup *mem);
 152
 153 void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx);
 154 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 155 void mem_cgroup_split_huge_fixup(struct page *head, struct page *tail);
 156 #endif
 157
 158 #ifdef CONFIG_DEBUG_VM
 159 bool mem_cgroup_bad_page_check(struct page *page);
 160 void mem_cgroup_print_bad_page(struct page *page);
 161 #endif
 162 #else /* CONFIG_CGROUP_MEM_RES_CTLR */
 163 struct mem_cgroup;
 164
 165 static inline int mem_cgroup_newpage_charge(struct page *page,
 166                                         struct mm_struct *mm, gfp_t gfp_mask)
 167 {
 168         return 0;
 169 }
 170
 171 static inline int mem_cgroup_cache_charge(struct page *page,
 172                                         struct mm_struct *mm, gfp_t gfp_mask)
 173 {
 174         return 0;
 175 }
 176
 177 static inline int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
 178                 struct page *page, gfp_t gfp_mask, struct mem_cgroup **ptr)
 179 {
 180         return 0;
 181 }
 182
 183 static inline void mem_cgroup_commit_charge_swapin(struct page *page,
 184                                           struct mem_cgroup *ptr)
 185 {
 186 }
 187
 188 static inline void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr)
 189 {
 190 }
 191
 192 static inline void mem_cgroup_uncharge_start(void)
 193 {
 194 }
 195
 196 static inline void mem_cgroup_uncharge_end(void)
 197 {
 198 }
 199
 200 static inline void mem_cgroup_uncharge_page(struct page *page)
 201 {
 202 }
 203
 204 static inline void mem_cgroup_uncharge_cache_page(struct page *page)
 205 {
 206 }
 207
 208 static inline void mem_cgroup_add_lru_list(struct page *page, int lru)
 209 {
 210 }
 211
 212 static inline void mem_cgroup_del_lru_list(struct page *page, int lru)
 213 {
 214         return ;
 215 }
 216
 217 static inline void mem_cgroup_rotate_reclaimable_page(struct page *page)
 218 {
 219         return ;
 220 }
 221
 222 static inline void mem_cgroup_rotate_lru_list(struct page *page, int lru)
 223 {
 224         return ;
 225 }
 226
 227 static inline void mem_cgroup_del_lru(struct page *page)
 228 {
 229         return ;
 230 }
 231
 232 static inline void
 233 mem_cgroup_move_lists(struct page *page, enum lru_list from, enum lru_list to)
 234 {
 235 }
 236
 237 static inline struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page)
 238 {
 239         return NULL;
 240 }
 241
 242 static inline struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm)
 243 {
 244         return NULL;
 245 }
 246
 247 static inline int mm_match_cgroup(struct mm_struct *mm, struct mem_cgroup *mem)
 248 {
 249         return 1;
 250 }
 251
 252 static inline int task_in_mem_cgroup(struct task_struct *task,
 253                                      const struct mem_cgroup *mem)
 254 {
 255         return 1;
 256 }
 257
 258 static inline struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *mem)
 259 {
 260         return NULL;
 261 }
 262
 263 static inline int
 264 mem_cgroup_prepare_migration(struct page *page, struct page *newpage,
 265         struct mem_cgroup **ptr, gfp_t gfp_mask)
 266 {
 267         return 0;
 268 }
 269
 270 static inline void mem_cgroup_end_migration(struct mem_cgroup *mem,
 271                 struct page *oldpage, struct page *newpage, bool migration_ok)
 272 {
 273 }
 274
 275 static inline int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem)
 276 {
 277         return 0;
 278 }
 279
 280 static inline void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem,
 281                                                 int priority)
 282 {
 283 }
 284
 285 static inline void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem,
 286                                                 int priority)
 287 {
 288 }
 289
 290 static inline bool mem_cgroup_disabled(void)
 291 {
 292         return true;
 293 }
 294
 295 static inline int
 296 mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg)
 297 {
 298         return 1;
 299 }
 300
 301 static inline int
 302 mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg)
 303 {
 304         return 1;
 305 }
 306
 307 static inline unsigned long
 308 mem_cgroup_zone_nr_lru_pages(struct mem_cgroup *memcg, int nid, int zid,
 309                                 unsigned int lru_mask)
 310 {
 311         return 0;
 312 }
 313
 314
 315 static inline struct zone_reclaim_stat*
 316 mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg, struct zone *zone)
 317 {
 318         return NULL;
 319 }
 320
 321 static inline struct zone_reclaim_stat*
 322 mem_cgroup_get_reclaim_stat_from_page(struct page *page)
 323 {
 324         return NULL;
 325 }
 326
 327 static inline void
 328 mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
 329 {
 330 }
 331
 332 static inline void mem_cgroup_inc_page_stat(struct page *page,
 333                                             enum mem_cgroup_page_stat_item idx)
 334 {
 335 }
 336
 337 static inline void mem_cgroup_dec_page_stat(struct page *page,
 338                                             enum mem_cgroup_page_stat_item idx)
 339 {
 340 }
 341
 342 static inline
 343 unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
 344                                             gfp_t gfp_mask,
 345                                             unsigned long *total_scanned)
 346 {
 347         return 0;
 348 }
 349
 350 static inline
 351 u64 mem_cgroup_get_limit(struct mem_cgroup *mem)
 352 {
 353         return 0;
 354 }
 355
 356 static inline void mem_cgroup_split_huge_fixup(struct page *head,
 357                                                 struct page *tail)
 358 {
 359 }
 360
 361 static inline
 362 void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx)
 363 {
 364 }
 365 #endif /* CONFIG_CGROUP_MEM_CONT */
 366
 367 #if !defined(CONFIG_CGROUP_MEM_RES_CTLR) || !defined(CONFIG_DEBUG_VM)
 368 static inline bool
 369 mem_cgroup_bad_page_check(struct page *page)
 370 {
 371         return false;
 372 }
 373
 374 static inline void
 375 mem_cgroup_print_bad_page(struct page *page)
 376 {
 377 }
 378 #endif
 379
 380 #endif /* _LINUX_MEMCONTROL_H */
 381