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 extern unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,
  29                                         struct list_head *dst,
  30                                         unsigned long *scanned, int order,
  31                                         int mode, struct zone *z,
  32                                         struct mem_cgroup *mem_cont,
  33                                         int active, int file);
  34
  35 #ifdef CONFIG_CGROUP_MEM_RES_CTLR
  36 /*
  37  * All "charge" functions with gfp_mask should use GFP_KERNEL or
  38  * (gfp_mask & GFP_RECLAIM_MASK). In current implementatin, memcg doesn't
  39  * alloc memory but reclaims memory from all available zones. So, "where I want
  40  * memory from" bits of gfp_mask has no meaning. So any bits of that field is
  41  * available but adding a rule is better. charge functions' gfp_mask should
  42  * be set to GFP_KERNEL or gfp_mask & GFP_RECLAIM_MASK for avoiding ambiguous
  43  * codes.
  44  * (Of course, if memcg does memory allocation in future, GFP_KERNEL is sane.)
  45  */
  46
  47 extern int mem_cgroup_newpage_charge(struct page *page, struct mm_struct *mm,
  48                                 gfp_t gfp_mask);
  49 /* for swap handling */
  50 extern int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
  51                 struct page *page, gfp_t mask, struct mem_cgroup **ptr);
  52 extern void mem_cgroup_commit_charge_swapin(struct page *page,
  53                                         struct mem_cgroup *ptr);
  54 extern void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr);
  55
  56 extern int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
  57                                         gfp_t gfp_mask);
  58 extern void mem_cgroup_add_lru_list(struct page *page, enum lru_list lru);
  59 extern void mem_cgroup_del_lru_list(struct page *page, enum lru_list lru);
  60 extern void mem_cgroup_rotate_lru_list(struct page *page, enum lru_list lru);
  61 extern void mem_cgroup_del_lru(struct page *page);
  62 extern void mem_cgroup_move_lists(struct page *page,
  63                                   enum lru_list from, enum lru_list to);
  64
  65 /* For coalescing uncharge for reducing memcg' overhead*/
  66 extern void mem_cgroup_uncharge_start(void);
  67 extern void mem_cgroup_uncharge_end(void);
  68
  69 extern void mem_cgroup_uncharge_page(struct page *page);
  70 extern void mem_cgroup_uncharge_cache_page(struct page *page);
  71 extern int mem_cgroup_shmem_charge_fallback(struct page *page,
  72                         struct mm_struct *mm, gfp_t gfp_mask);
  73
  74 extern void mem_cgroup_out_of_memory(struct mem_cgroup *mem, gfp_t gfp_mask);
  75 int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem);
  76
  77 extern struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page);
  78 extern struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p);
  79
  80 static inline
  81 int mm_match_cgroup(const struct mm_struct *mm, const struct mem_cgroup *cgroup)
  82 {
  83         struct mem_cgroup *mem;
  84         rcu_read_lock();
  85         mem = mem_cgroup_from_task(rcu_dereference((mm)->owner));
  86         rcu_read_unlock();
  87         return cgroup == mem;
  88 }
  89
  90 extern struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *mem);
  91
  92 extern int
  93 mem_cgroup_prepare_migration(struct page *page, struct mem_cgroup **ptr);
  94 extern void mem_cgroup_end_migration(struct mem_cgroup *mem,
  95         struct page *oldpage, struct page *newpage);
  96
  97 /*
  98  * For memory reclaim.
  99  */
 100 extern int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem);
 101 extern void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem,
 102                                                         int priority);
 103 extern void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem,
 104                                                         int priority);
 105 int mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg);
 106 int mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg);
 107 unsigned long mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg,
 108                                        struct zone *zone,
 109                                        enum lru_list lru);
 110 struct zone_reclaim_stat *mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg,
 111                                                       struct zone *zone);
 112 struct zone_reclaim_stat*
 113 mem_cgroup_get_reclaim_stat_from_page(struct page *page);
 114 extern void mem_cgroup_print_oom_info(struct mem_cgroup *memcg,
 115                                         struct task_struct *p);
 116
 117 #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
 118 extern int do_swap_account;
 119 #endif
 120
 121 static inline bool mem_cgroup_disabled(void)
 122 {
 123         if (mem_cgroup_subsys.disabled)
 124                 return true;
 125         return false;
 126 }
 127
 128 void mem_cgroup_update_file_mapped(struct page *page, int val);
 129 unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
 130                                                 gfp_t gfp_mask, int nid,
 131                                                 int zid);
 132 #else /* CONFIG_CGROUP_MEM_RES_CTLR */
 133 struct mem_cgroup;
 134
 135 static inline int mem_cgroup_newpage_charge(struct page *page,
 136                                         struct mm_struct *mm, gfp_t gfp_mask)
 137 {
 138         return 0;
 139 }
 140
 141 static inline int mem_cgroup_cache_charge(struct page *page,
 142                                         struct mm_struct *mm, gfp_t gfp_mask)
 143 {
 144         return 0;
 145 }
 146
 147 static inline int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
 148                 struct page *page, gfp_t gfp_mask, struct mem_cgroup **ptr)
 149 {
 150         return 0;
 151 }
 152
 153 static inline void mem_cgroup_commit_charge_swapin(struct page *page,
 154                                           struct mem_cgroup *ptr)
 155 {
 156 }
 157
 158 static inline void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr)
 159 {
 160 }
 161
 162 static inline void mem_cgroup_uncharge_start(void)
 163 {
 164 }
 165
 166 static inline void mem_cgroup_uncharge_end(void)
 167 {
 168 }
 169
 170 static inline void mem_cgroup_uncharge_page(struct page *page)
 171 {
 172 }
 173
 174 static inline void mem_cgroup_uncharge_cache_page(struct page *page)
 175 {
 176 }
 177
 178 static inline int mem_cgroup_shmem_charge_fallback(struct page *page,
 179                         struct mm_struct *mm, gfp_t gfp_mask)
 180 {
 181         return 0;
 182 }
 183
 184 static inline void mem_cgroup_add_lru_list(struct page *page, int lru)
 185 {
 186 }
 187
 188 static inline void mem_cgroup_del_lru_list(struct page *page, int lru)
 189 {
 190         return ;
 191 }
 192
 193 static inline void mem_cgroup_rotate_lru_list(struct page *page, int lru)
 194 {
 195         return ;
 196 }
 197
 198 static inline void mem_cgroup_del_lru(struct page *page)
 199 {
 200         return ;
 201 }
 202
 203 static inline void
 204 mem_cgroup_move_lists(struct page *page, enum lru_list from, enum lru_list to)
 205 {
 206 }
 207
 208 static inline struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page)
 209 {
 210         return NULL;
 211 }
 212
 213 static inline int mm_match_cgroup(struct mm_struct *mm, struct mem_cgroup *mem)
 214 {
 215         return 1;
 216 }
 217
 218 static inline int task_in_mem_cgroup(struct task_struct *task,
 219                                      const struct mem_cgroup *mem)
 220 {
 221         return 1;
 222 }
 223
 224 static inline struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *mem)
 225 {
 226         return NULL;
 227 }
 228
 229 static inline int
 230 mem_cgroup_prepare_migration(struct page *page, struct mem_cgroup **ptr)
 231 {
 232         return 0;
 233 }
 234
 235 static inline void mem_cgroup_end_migration(struct mem_cgroup *mem,
 236                                         struct page *oldpage,
 237                                         struct page *newpage)
 238 {
 239 }
 240
 241 static inline int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem)
 242 {
 243         return 0;
 244 }
 245
 246 static inline void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem,
 247                                                 int priority)
 248 {
 249 }
 250
 251 static inline void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem,
 252                                                 int priority)
 253 {
 254 }
 255
 256 static inline bool mem_cgroup_disabled(void)
 257 {
 258         return true;
 259 }
 260
 261 static inline int
 262 mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg)
 263 {
 264         return 1;
 265 }
 266
 267 static inline int
 268 mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg)
 269 {
 270         return 1;
 271 }
 272
 273 static inline unsigned long
 274 mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg, struct zone *zone,
 275                          enum lru_list lru)
 276 {
 277         return 0;
 278 }
 279
 280
 281 static inline struct zone_reclaim_stat*
 282 mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg, struct zone *zone)
 283 {
 284         return NULL;
 285 }
 286
 287 static inline struct zone_reclaim_stat*
 288 mem_cgroup_get_reclaim_stat_from_page(struct page *page)
 289 {
 290         return NULL;
 291 }
 292
 293 static inline void
 294 mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
 295 {
 296 }
 297
 298 static inline void mem_cgroup_update_file_mapped(struct page *page,
 299                                                         int val)
 300 {
 301 }
 302
 303 static inline
 304 unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
 305                                             gfp_t gfp_mask, int nid, int zid)
 306 {
 307         return 0;
 308 }
 309
 310 #endif /* CONFIG_CGROUP_MEM_CONT */
 311
 312 #endif /* _LINUX_MEMCONTROL_H */
 313