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 #ifdef CONFIG_CGROUP_MEM_RES_CTLR
  29 /*
  30  * All "charge" functions with gfp_mask should use GFP_KERNEL or
  31  * (gfp_mask & GFP_RECLAIM_MASK). In current implementatin, memcg doesn't
  32  * alloc memory but reclaims memory from all available zones. So, "where I want
  33  * memory from" bits of gfp_mask has no meaning. So any bits of that field is
  34  * available but adding a rule is better. charge functions' gfp_mask should
  35  * be set to GFP_KERNEL or gfp_mask & GFP_RECLAIM_MASK for avoiding ambiguous
  36  * codes.
  37  * (Of course, if memcg does memory allocation in future, GFP_KERNEL is sane.)
  38  */
  39
  40 extern int mem_cgroup_newpage_charge(struct page *page, struct mm_struct *mm,
  41                                 gfp_t gfp_mask);
  42 /* for swap handling */
  43 extern int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
  44                 struct page *page, gfp_t mask, struct mem_cgroup **ptr);
  45 extern void mem_cgroup_commit_charge_swapin(struct page *page,
  46                                         struct mem_cgroup *ptr);
  47 extern void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr);
  48
  49 extern int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
  50                                         gfp_t gfp_mask);
  51 extern void mem_cgroup_add_lru_list(struct page *page, enum lru_list lru);
  52 extern void mem_cgroup_del_lru_list(struct page *page, enum lru_list lru);
  53 extern void mem_cgroup_rotate_lru_list(struct page *page, enum lru_list lru);
  54 extern void mem_cgroup_del_lru(struct page *page);
  55 extern void mem_cgroup_move_lists(struct page *page,
  56                                   enum lru_list from, enum lru_list to);
  57
  58 /* For coalescing uncharge for reducing memcg' overhead*/
  59 extern void mem_cgroup_uncharge_start(void);
  60 extern void mem_cgroup_uncharge_end(void);
  61
  62 extern void mem_cgroup_uncharge_page(struct page *page);
  63 extern void mem_cgroup_uncharge_cache_page(struct page *page);
  64 extern int mem_cgroup_shmem_charge_fallback(struct page *page,
  65                         struct mm_struct *mm, gfp_t gfp_mask);
  66
  67 extern unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,
  68                                         struct list_head *dst,
  69                                         unsigned long *scanned, int order,
  70                                         int mode, struct zone *z,
  71                                         struct mem_cgroup *mem_cont,
  72                                         int active, int file);
  73 extern void mem_cgroup_out_of_memory(struct mem_cgroup *mem, gfp_t gfp_mask);
  74 int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem);
  75
  76 extern struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page);
  77 extern struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p);
  78
  79 static inline
  80 int mm_match_cgroup(const struct mm_struct *mm, const struct mem_cgroup *cgroup)
  81 {
  82         struct mem_cgroup *mem;
  83         rcu_read_lock();
  84         mem = mem_cgroup_from_task(rcu_dereference((mm)->owner));
  85         rcu_read_unlock();
  86         return cgroup == mem;
  87 }
  88
  89 extern struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *mem);
  90
  91 extern int
  92 mem_cgroup_prepare_migration(struct page *page, struct mem_cgroup **ptr);
  93 extern void mem_cgroup_end_migration(struct mem_cgroup *mem,
  94         struct page *oldpage, struct page *newpage);
  95
  96 /*
  97  * For memory reclaim.
  98  */
  99 extern int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem);
 100 extern void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem,
 101                                                         int priority);
 102 extern void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem,
 103                                                         int priority);
 104 int mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg);
 105 int mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg);
 106 unsigned long mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg,
 107                                        struct zone *zone,
 108                                        enum lru_list lru);
 109 struct zone_reclaim_stat *mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg,
 110                                                       struct zone *zone);
 111 struct zone_reclaim_stat*
 112 mem_cgroup_get_reclaim_stat_from_page(struct page *page);
 113 extern void mem_cgroup_print_oom_info(struct mem_cgroup *memcg,
 114                                         struct task_struct *p);
 115
 116 #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
 117 extern int do_swap_account;
 118 #endif
 119
 120 static inline bool mem_cgroup_disabled(void)
 121 {
 122         if (mem_cgroup_subsys.disabled)
 123                 return true;
 124         return false;
 125 }
 126
 127 void mem_cgroup_update_file_mapped(struct page *page, int val);
 128 unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
 129                                                 gfp_t gfp_mask, int nid,
 130                                                 int zid);
 131 #else /* CONFIG_CGROUP_MEM_RES_CTLR */
 132 struct mem_cgroup;
 133
 134 static inline int mem_cgroup_newpage_charge(struct page *page,
 135                                         struct mm_struct *mm, gfp_t gfp_mask)
 136 {
 137         return 0;
 138 }
 139
 140 static inline int mem_cgroup_cache_charge(struct page *page,
 141                                         struct mm_struct *mm, gfp_t gfp_mask)
 142 {
 143         return 0;
 144 }
 145
 146 static inline int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
 147                 struct page *page, gfp_t gfp_mask, struct mem_cgroup **ptr)
 148 {
 149         return 0;
 150 }
 151
 152 static inline void mem_cgroup_commit_charge_swapin(struct page *page,
 153                                           struct mem_cgroup *ptr)
 154 {
 155 }
 156
 157 static inline void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr)
 158 {
 159 }
 160
 161 static inline void mem_cgroup_uncharge_start(void)
 162 {
 163 }
 164
 165 static inline void mem_cgroup_uncharge_end(void)
 166 {
 167 }
 168
 169 static inline void mem_cgroup_uncharge_page(struct page *page)
 170 {
 171 }
 172
 173 static inline void mem_cgroup_uncharge_cache_page(struct page *page)
 174 {
 175 }
 176
 177 static inline int mem_cgroup_shmem_charge_fallback(struct page *page,
 178                         struct mm_struct *mm, gfp_t gfp_mask)
 179 {
 180         return 0;
 181 }
 182
 183 static inline void mem_cgroup_add_lru_list(struct page *page, int lru)
 184 {
 185 }
 186
 187 static inline void mem_cgroup_del_lru_list(struct page *page, int lru)
 188 {
 189         return ;
 190 }
 191
 192 static inline void mem_cgroup_rotate_lru_list(struct page *page, int lru)
 193 {
 194         return ;
 195 }
 196
 197 static inline void mem_cgroup_del_lru(struct page *page)
 198 {
 199         return ;
 200 }
 201
 202 static inline void
 203 mem_cgroup_move_lists(struct page *page, enum lru_list from, enum lru_list to)
 204 {
 205 }
 206
 207 static inline struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page)
 208 {
 209         return NULL;
 210 }
 211
 212 static inline int mm_match_cgroup(struct mm_struct *mm, struct mem_cgroup *mem)
 213 {
 214         return 1;
 215 }
 216
 217 static inline int task_in_mem_cgroup(struct task_struct *task,
 218                                      const struct mem_cgroup *mem)
 219 {
 220         return 1;
 221 }
 222
 223 static inline struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *mem)
 224 {
 225         return NULL;
 226 }
 227
 228 static inline int
 229 mem_cgroup_prepare_migration(struct page *page, struct mem_cgroup **ptr)
 230 {
 231         return 0;
 232 }
 233
 234 static inline void mem_cgroup_end_migration(struct mem_cgroup *mem,
 235                                         struct page *oldpage,
 236                                         struct page *newpage)
 237 {
 238 }
 239
 240 static inline int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem)
 241 {
 242         return 0;
 243 }
 244
 245 static inline void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem,
 246                                                 int priority)
 247 {
 248 }
 249
 250 static inline void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem,
 251                                                 int priority)
 252 {
 253 }
 254
 255 static inline bool mem_cgroup_disabled(void)
 256 {
 257         return true;
 258 }
 259
 260 static inline int
 261 mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg)
 262 {
 263         return 1;
 264 }
 265
 266 static inline int
 267 mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg)
 268 {
 269         return 1;
 270 }
 271
 272 static inline unsigned long
 273 mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg, struct zone *zone,
 274                          enum lru_list lru)
 275 {
 276         return 0;
 277 }
 278
 279
 280 static inline struct zone_reclaim_stat*
 281 mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg, struct zone *zone)
 282 {
 283         return NULL;
 284 }
 285
 286 static inline struct zone_reclaim_stat*
 287 mem_cgroup_get_reclaim_stat_from_page(struct page *page)
 288 {
 289         return NULL;
 290 }
 291
 292 static inline void
 293 mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
 294 {
 295 }
 296
 297 static inline void mem_cgroup_update_file_mapped(struct page *page,
 298                                                         int val)
 299 {
 300 }
 301
 302 static inline
 303 unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
 304                                             gfp_t gfp_mask, int nid, int zid)
 305 {
 306         return 0;
 307 }
 308
 309 #endif /* CONFIG_CGROUP_MEM_CONT */
 310
 311 #endif /* _LINUX_MEMCONTROL_H */
 312