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 extern void mem_cgroup_uncharge_page(struct page *page);
  58 extern void mem_cgroup_uncharge_cache_page(struct page *page);
  59 extern int mem_cgroup_shmem_charge_fallback(struct page *page,
  60                         struct mm_struct *mm, gfp_t gfp_mask);
  61
  62 extern unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,
  63                                         struct list_head *dst,
  64                                         unsigned long *scanned, int order,
  65                                         int mode, struct zone *z,
  66                                         struct mem_cgroup *mem_cont,
  67                                         int active, int file);
  68 extern void mem_cgroup_out_of_memory(struct mem_cgroup *mem, gfp_t gfp_mask);
  69 int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem);
  70
  71 extern struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p);
  72
  73 static inline
  74 int mm_match_cgroup(const struct mm_struct *mm, const struct mem_cgroup *cgroup)
  75 {
  76         struct mem_cgroup *mem;
  77         rcu_read_lock();
  78         mem = mem_cgroup_from_task(rcu_dereference((mm)->owner));
  79         rcu_read_unlock();
  80         return cgroup == mem;
  81 }
  82
  83 extern int
  84 mem_cgroup_prepare_migration(struct page *page, struct mem_cgroup **ptr);
  85 extern void mem_cgroup_end_migration(struct mem_cgroup *mem,
  86         struct page *oldpage, struct page *newpage);
  87
  88 /*
  89  * For memory reclaim.
  90  */
  91 extern int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem);
  92 extern void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem,
  93                                                         int priority);
  94 extern void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem,
  95                                                         int priority);
  96 int mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg);
  97 int mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg);
  98 unsigned long mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg,
  99                                        struct zone *zone,
 100                                        enum lru_list lru);
 101 struct zone_reclaim_stat *mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg,
 102                                                       struct zone *zone);
 103 struct zone_reclaim_stat*
 104 mem_cgroup_get_reclaim_stat_from_page(struct page *page);
 105 extern void mem_cgroup_print_oom_info(struct mem_cgroup *memcg,
 106                                         struct task_struct *p);
 107
 108 #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
 109 extern int do_swap_account;
 110 #endif
 111
 112 static inline bool mem_cgroup_disabled(void)
 113 {
 114         if (mem_cgroup_subsys.disabled)
 115                 return true;
 116         return false;
 117 }
 118
 119 extern bool mem_cgroup_oom_called(struct task_struct *task);
 120 void mem_cgroup_update_mapped_file_stat(struct page *page, int val);
 121 unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
 122                                                 gfp_t gfp_mask, int nid,
 123                                                 int zid);
 124 #else /* CONFIG_CGROUP_MEM_RES_CTLR */
 125 struct mem_cgroup;
 126
 127 static inline int mem_cgroup_newpage_charge(struct page *page,
 128                                         struct mm_struct *mm, gfp_t gfp_mask)
 129 {
 130         return 0;
 131 }
 132
 133 static inline int mem_cgroup_cache_charge(struct page *page,
 134                                         struct mm_struct *mm, gfp_t gfp_mask)
 135 {
 136         return 0;
 137 }
 138
 139 static inline int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
 140                 struct page *page, gfp_t gfp_mask, struct mem_cgroup **ptr)
 141 {
 142         return 0;
 143 }
 144
 145 static inline void mem_cgroup_commit_charge_swapin(struct page *page,
 146                                           struct mem_cgroup *ptr)
 147 {
 148 }
 149
 150 static inline void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr)
 151 {
 152 }
 153
 154 static inline void mem_cgroup_uncharge_page(struct page *page)
 155 {
 156 }
 157
 158 static inline void mem_cgroup_uncharge_cache_page(struct page *page)
 159 {
 160 }
 161
 162 static inline int mem_cgroup_shmem_charge_fallback(struct page *page,
 163                         struct mm_struct *mm, gfp_t gfp_mask)
 164 {
 165         return 0;
 166 }
 167
 168 static inline void mem_cgroup_add_lru_list(struct page *page, int lru)
 169 {
 170 }
 171
 172 static inline void mem_cgroup_del_lru_list(struct page *page, int lru)
 173 {
 174         return ;
 175 }
 176
 177 static inline void mem_cgroup_rotate_lru_list(struct page *page, int lru)
 178 {
 179         return ;
 180 }
 181
 182 static inline void mem_cgroup_del_lru(struct page *page)
 183 {
 184         return ;
 185 }
 186
 187 static inline void
 188 mem_cgroup_move_lists(struct page *page, enum lru_list from, enum lru_list to)
 189 {
 190 }
 191
 192 static inline int mm_match_cgroup(struct mm_struct *mm, struct mem_cgroup *mem)
 193 {
 194         return 1;
 195 }
 196
 197 static inline int task_in_mem_cgroup(struct task_struct *task,
 198                                      const struct mem_cgroup *mem)
 199 {
 200         return 1;
 201 }
 202
 203 static inline int
 204 mem_cgroup_prepare_migration(struct page *page, struct mem_cgroup **ptr)
 205 {
 206         return 0;
 207 }
 208
 209 static inline void mem_cgroup_end_migration(struct mem_cgroup *mem,
 210                                         struct page *oldpage,
 211                                         struct page *newpage)
 212 {
 213 }
 214
 215 static inline int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem)
 216 {
 217         return 0;
 218 }
 219
 220 static inline void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem,
 221                                                 int priority)
 222 {
 223 }
 224
 225 static inline void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem,
 226                                                 int priority)
 227 {
 228 }
 229
 230 static inline bool mem_cgroup_disabled(void)
 231 {
 232         return true;
 233 }
 234
 235 static inline bool mem_cgroup_oom_called(struct task_struct *task)
 236 {
 237         return false;
 238 }
 239
 240 static inline int
 241 mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg)
 242 {
 243         return 1;
 244 }
 245
 246 static inline int
 247 mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg)
 248 {
 249         return 1;
 250 }
 251
 252 static inline unsigned long
 253 mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg, struct zone *zone,
 254                          enum lru_list lru)
 255 {
 256         return 0;
 257 }
 258
 259
 260 static inline struct zone_reclaim_stat*
 261 mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg, struct zone *zone)
 262 {
 263         return NULL;
 264 }
 265
 266 static inline struct zone_reclaim_stat*
 267 mem_cgroup_get_reclaim_stat_from_page(struct page *page)
 268 {
 269         return NULL;
 270 }
 271
 272 static inline void
 273 mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
 274 {
 275 }
 276
 277 static inline void mem_cgroup_update_mapped_file_stat(struct page *page,
 278                                                         int val)
 279 {
 280 }
 281
 282 static inline
 283 unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
 284                                             gfp_t gfp_mask, int nid, int zid)
 285 {
 286         return 0;
 287 }
 288
 289 #endif /* CONFIG_CGROUP_MEM_CONT */
 290
 291 #endif /* _LINUX_MEMCONTROL_H */
 292