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 *mem_cgroup_from_task(struct task_struct *p);
  77
  78 static inline
  79 int mm_match_cgroup(const struct mm_struct *mm, const struct mem_cgroup *cgroup)
  80 {
  81         struct mem_cgroup *mem;
  82         rcu_read_lock();
  83         mem = mem_cgroup_from_task(rcu_dereference((mm)->owner));
  84         rcu_read_unlock();
  85         return cgroup == mem;
  86 }
  87
  88 extern int
  89 mem_cgroup_prepare_migration(struct page *page, struct mem_cgroup **ptr);
  90 extern void mem_cgroup_end_migration(struct mem_cgroup *mem,
  91         struct page *oldpage, struct page *newpage);
  92
  93 /*
  94  * For memory reclaim.
  95  */
  96 extern int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem);
  97 extern void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem,
  98                                                         int priority);
  99 extern void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem,
 100                                                         int priority);
 101 int mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg);
 102 int mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg);
 103 unsigned long mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg,
 104                                        struct zone *zone,
 105                                        enum lru_list lru);
 106 struct zone_reclaim_stat *mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg,
 107                                                       struct zone *zone);
 108 struct zone_reclaim_stat*
 109 mem_cgroup_get_reclaim_stat_from_page(struct page *page);
 110 extern void mem_cgroup_print_oom_info(struct mem_cgroup *memcg,
 111                                         struct task_struct *p);
 112
 113 #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
 114 extern int do_swap_account;
 115 #endif
 116
 117 static inline bool mem_cgroup_disabled(void)
 118 {
 119         if (mem_cgroup_subsys.disabled)
 120                 return true;
 121         return false;
 122 }
 123
 124 extern bool mem_cgroup_oom_called(struct task_struct *task);
 125 void mem_cgroup_update_file_mapped(struct page *page, int val);
 126 unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
 127                                                 gfp_t gfp_mask, int nid,
 128                                                 int zid);
 129 #else /* CONFIG_CGROUP_MEM_RES_CTLR */
 130 struct mem_cgroup;
 131
 132 static inline int mem_cgroup_newpage_charge(struct page *page,
 133                                         struct mm_struct *mm, gfp_t gfp_mask)
 134 {
 135         return 0;
 136 }
 137
 138 static inline int mem_cgroup_cache_charge(struct page *page,
 139                                         struct mm_struct *mm, gfp_t gfp_mask)
 140 {
 141         return 0;
 142 }
 143
 144 static inline int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
 145                 struct page *page, gfp_t gfp_mask, struct mem_cgroup **ptr)
 146 {
 147         return 0;
 148 }
 149
 150 static inline void mem_cgroup_commit_charge_swapin(struct page *page,
 151                                           struct mem_cgroup *ptr)
 152 {
 153 }
 154
 155 static inline void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr)
 156 {
 157 }
 158
 159 static inline void mem_cgroup_uncharge_start(void)
 160 {
 161 }
 162
 163 static inline void mem_cgroup_uncharge_end(void)
 164 {
 165 }
 166
 167 static inline void mem_cgroup_uncharge_page(struct page *page)
 168 {
 169 }
 170
 171 static inline void mem_cgroup_uncharge_cache_page(struct page *page)
 172 {
 173 }
 174
 175 static inline int mem_cgroup_shmem_charge_fallback(struct page *page,
 176                         struct mm_struct *mm, gfp_t gfp_mask)
 177 {
 178         return 0;
 179 }
 180
 181 static inline void mem_cgroup_add_lru_list(struct page *page, int lru)
 182 {
 183 }
 184
 185 static inline void mem_cgroup_del_lru_list(struct page *page, int lru)
 186 {
 187         return ;
 188 }
 189
 190 static inline void mem_cgroup_rotate_lru_list(struct page *page, int lru)
 191 {
 192         return ;
 193 }
 194
 195 static inline void mem_cgroup_del_lru(struct page *page)
 196 {
 197         return ;
 198 }
 199
 200 static inline void
 201 mem_cgroup_move_lists(struct page *page, enum lru_list from, enum lru_list to)
 202 {
 203 }
 204
 205 static inline int mm_match_cgroup(struct mm_struct *mm, struct mem_cgroup *mem)
 206 {
 207         return 1;
 208 }
 209
 210 static inline int task_in_mem_cgroup(struct task_struct *task,
 211                                      const struct mem_cgroup *mem)
 212 {
 213         return 1;
 214 }
 215
 216 static inline int
 217 mem_cgroup_prepare_migration(struct page *page, struct mem_cgroup **ptr)
 218 {
 219         return 0;
 220 }
 221
 222 static inline void mem_cgroup_end_migration(struct mem_cgroup *mem,
 223                                         struct page *oldpage,
 224                                         struct page *newpage)
 225 {
 226 }
 227
 228 static inline int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem)
 229 {
 230         return 0;
 231 }
 232
 233 static inline void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem,
 234                                                 int priority)
 235 {
 236 }
 237
 238 static inline void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem,
 239                                                 int priority)
 240 {
 241 }
 242
 243 static inline bool mem_cgroup_disabled(void)
 244 {
 245         return true;
 246 }
 247
 248 static inline bool mem_cgroup_oom_called(struct task_struct *task)
 249 {
 250         return false;
 251 }
 252
 253 static inline int
 254 mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg)
 255 {
 256         return 1;
 257 }
 258
 259 static inline int
 260 mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg)
 261 {
 262         return 1;
 263 }
 264
 265 static inline unsigned long
 266 mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg, struct zone *zone,
 267                          enum lru_list lru)
 268 {
 269         return 0;
 270 }
 271
 272
 273 static inline struct zone_reclaim_stat*
 274 mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg, struct zone *zone)
 275 {
 276         return NULL;
 277 }
 278
 279 static inline struct zone_reclaim_stat*
 280 mem_cgroup_get_reclaim_stat_from_page(struct page *page)
 281 {
 282         return NULL;
 283 }
 284
 285 static inline void
 286 mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
 287 {
 288 }
 289
 290 static inline void mem_cgroup_update_file_mapped(struct page *page,
 291                                                         int val)
 292 {
 293 }
 294
 295 static inline
 296 unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
 297                                             gfp_t gfp_mask, int nid, int zid)
 298 {
 299         return 0;
 300 }
 301
 302 #endif /* CONFIG_CGROUP_MEM_CONT */
 303
 304 #endif /* _LINUX_MEMCONTROL_H */
 305