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,
  94         struct page *newpage, struct mem_cgroup **ptr);
  95 extern void mem_cgroup_end_migration(struct mem_cgroup *mem,
  96         struct page *oldpage, struct page *newpage);
  97
  98 /*
  99  * For memory reclaim.
 100  */
 101 extern int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem);
 102 extern void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem,
 103                                                         int priority);
 104 extern void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem,
 105                                                         int priority);
 106 int mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg);
 107 int mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg);
 108 unsigned long mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg,
 109                                        struct zone *zone,
 110                                        enum lru_list lru);
 111 struct zone_reclaim_stat *mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg,
 112                                                       struct zone *zone);
 113 struct zone_reclaim_stat*
 114 mem_cgroup_get_reclaim_stat_from_page(struct page *page);
 115 extern void mem_cgroup_print_oom_info(struct mem_cgroup *memcg,
 116                                         struct task_struct *p);
 117
 118 #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
 119 extern int do_swap_account;
 120 #endif
 121
 122 static inline bool mem_cgroup_disabled(void)
 123 {
 124         if (mem_cgroup_subsys.disabled)
 125                 return true;
 126         return false;
 127 }
 128
 129 void mem_cgroup_update_file_mapped(struct page *page, int val);
 130 unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
 131                                                 gfp_t gfp_mask, int nid,
 132                                                 int zid);
 133 #else /* CONFIG_CGROUP_MEM_RES_CTLR */
 134 struct mem_cgroup;
 135
 136 static inline int mem_cgroup_newpage_charge(struct page *page,
 137                                         struct mm_struct *mm, gfp_t gfp_mask)
 138 {
 139         return 0;
 140 }
 141
 142 static inline int mem_cgroup_cache_charge(struct page *page,
 143                                         struct mm_struct *mm, gfp_t gfp_mask)
 144 {
 145         return 0;
 146 }
 147
 148 static inline int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
 149                 struct page *page, gfp_t gfp_mask, struct mem_cgroup **ptr)
 150 {
 151         return 0;
 152 }
 153
 154 static inline void mem_cgroup_commit_charge_swapin(struct page *page,
 155                                           struct mem_cgroup *ptr)
 156 {
 157 }
 158
 159 static inline void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr)
 160 {
 161 }
 162
 163 static inline void mem_cgroup_uncharge_start(void)
 164 {
 165 }
 166
 167 static inline void mem_cgroup_uncharge_end(void)
 168 {
 169 }
 170
 171 static inline void mem_cgroup_uncharge_page(struct page *page)
 172 {
 173 }
 174
 175 static inline void mem_cgroup_uncharge_cache_page(struct page *page)
 176 {
 177 }
 178
 179 static inline int mem_cgroup_shmem_charge_fallback(struct page *page,
 180                         struct mm_struct *mm, gfp_t gfp_mask)
 181 {
 182         return 0;
 183 }
 184
 185 static inline void mem_cgroup_add_lru_list(struct page *page, int lru)
 186 {
 187 }
 188
 189 static inline void mem_cgroup_del_lru_list(struct page *page, int lru)
 190 {
 191         return ;
 192 }
 193
 194 static inline void mem_cgroup_rotate_lru_list(struct page *page, int lru)
 195 {
 196         return ;
 197 }
 198
 199 static inline void mem_cgroup_del_lru(struct page *page)
 200 {
 201         return ;
 202 }
 203
 204 static inline void
 205 mem_cgroup_move_lists(struct page *page, enum lru_list from, enum lru_list to)
 206 {
 207 }
 208
 209 static inline struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page)
 210 {
 211         return NULL;
 212 }
 213
 214 static inline int mm_match_cgroup(struct mm_struct *mm, struct mem_cgroup *mem)
 215 {
 216         return 1;
 217 }
 218
 219 static inline int task_in_mem_cgroup(struct task_struct *task,
 220                                      const struct mem_cgroup *mem)
 221 {
 222         return 1;
 223 }
 224
 225 static inline struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *mem)
 226 {
 227         return NULL;
 228 }
 229
 230 static inline int
 231 mem_cgroup_prepare_migration(struct page *page, struct page *newpage,
 232         struct mem_cgroup **ptr)
 233 {
 234         return 0;
 235 }
 236
 237 static inline void mem_cgroup_end_migration(struct mem_cgroup *mem,
 238                                         struct page *oldpage,
 239                                         struct page *newpage)
 240 {
 241 }
 242
 243 static inline int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem)
 244 {
 245         return 0;
 246 }
 247
 248 static inline void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem,
 249                                                 int priority)
 250 {
 251 }
 252
 253 static inline void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem,
 254                                                 int priority)
 255 {
 256 }
 257
 258 static inline bool mem_cgroup_disabled(void)
 259 {
 260         return true;
 261 }
 262
 263 static inline int
 264 mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg)
 265 {
 266         return 1;
 267 }
 268
 269 static inline int
 270 mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg)
 271 {
 272         return 1;
 273 }
 274
 275 static inline unsigned long
 276 mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg, struct zone *zone,
 277                          enum lru_list lru)
 278 {
 279         return 0;
 280 }
 281
 282
 283 static inline struct zone_reclaim_stat*
 284 mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg, struct zone *zone)
 285 {
 286         return NULL;
 287 }
 288
 289 static inline struct zone_reclaim_stat*
 290 mem_cgroup_get_reclaim_stat_from_page(struct page *page)
 291 {
 292         return NULL;
 293 }
 294
 295 static inline void
 296 mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
 297 {
 298 }
 299
 300 static inline void mem_cgroup_update_file_mapped(struct page *page,
 301                                                         int val)
 302 {
 303 }
 304
 305 static inline
 306 unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
 307                                             gfp_t gfp_mask, int nid, int zid)
 308 {
 309         return 0;
 310 }
 311
 312 #endif /* CONFIG_CGROUP_MEM_CONT */
 313
 314 #endif /* _LINUX_MEMCONTROL_H */
 315