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_shrink_usage(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((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_calc_mapped_ratio(struct mem_cgroup *mem);
  92 extern long mem_cgroup_reclaim_imbalance(struct mem_cgroup *mem);
  93
  94 extern int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem);
  95 extern void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem,
  96                                                         int priority);
  97 extern void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem,
  98                                                         int priority);
  99 int mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg);
 100 unsigned long mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg,
 101                                        struct zone *zone,
 102                                        enum lru_list lru);
 103 struct zone_reclaim_stat *mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg,
 104                                                       struct zone *zone);
 105 struct zone_reclaim_stat*
 106 mem_cgroup_get_reclaim_stat_from_page(struct page *page);
 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
 121 #else /* CONFIG_CGROUP_MEM_RES_CTLR */
 122 struct mem_cgroup;
 123
 124 static inline int mem_cgroup_newpage_charge(struct page *page,
 125                                         struct mm_struct *mm, gfp_t gfp_mask)
 126 {
 127         return 0;
 128 }
 129
 130 static inline int mem_cgroup_cache_charge(struct page *page,
 131                                         struct mm_struct *mm, gfp_t gfp_mask)
 132 {
 133         return 0;
 134 }
 135
 136 static inline int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
 137                 struct page *page, gfp_t gfp_mask, struct mem_cgroup **ptr)
 138 {
 139         return 0;
 140 }
 141
 142 static inline void mem_cgroup_commit_charge_swapin(struct page *page,
 143                                           struct mem_cgroup *ptr)
 144 {
 145 }
 146
 147 static inline void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr)
 148 {
 149 }
 150
 151 static inline void mem_cgroup_uncharge_page(struct page *page)
 152 {
 153 }
 154
 155 static inline void mem_cgroup_uncharge_cache_page(struct page *page)
 156 {
 157 }
 158
 159 static inline int mem_cgroup_shrink_usage(struct page *page,
 160                         struct mm_struct *mm, gfp_t gfp_mask)
 161 {
 162         return 0;
 163 }
 164
 165 static inline void mem_cgroup_add_lru_list(struct page *page, int lru)
 166 {
 167 }
 168
 169 static inline void mem_cgroup_del_lru_list(struct page *page, int lru)
 170 {
 171         return ;
 172 }
 173
 174 static inline void mem_cgroup_rotate_lru_list(struct page *page, int lru)
 175 {
 176         return ;
 177 }
 178
 179 static inline void mem_cgroup_del_lru(struct page *page)
 180 {
 181         return ;
 182 }
 183
 184 static inline void
 185 mem_cgroup_move_lists(struct page *page, enum lru_list from, enum lru_list to)
 186 {
 187 }
 188
 189 static inline int mm_match_cgroup(struct mm_struct *mm, struct mem_cgroup *mem)
 190 {
 191         return 1;
 192 }
 193
 194 static inline int task_in_mem_cgroup(struct task_struct *task,
 195                                      const struct mem_cgroup *mem)
 196 {
 197         return 1;
 198 }
 199
 200 static inline int
 201 mem_cgroup_prepare_migration(struct page *page, struct mem_cgroup **ptr)
 202 {
 203         return 0;
 204 }
 205
 206 static inline void mem_cgroup_end_migration(struct mem_cgroup *mem,
 207                                         struct page *oldpage,
 208                                         struct page *newpage)
 209 {
 210 }
 211
 212 static inline int mem_cgroup_calc_mapped_ratio(struct mem_cgroup *mem)
 213 {
 214         return 0;
 215 }
 216
 217 static inline int mem_cgroup_reclaim_imbalance(struct mem_cgroup *mem)
 218 {
 219         return 0;
 220 }
 221
 222 static inline int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem)
 223 {
 224         return 0;
 225 }
 226
 227 static inline void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem,
 228                                                 int priority)
 229 {
 230 }
 231
 232 static inline void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem,
 233                                                 int priority)
 234 {
 235 }
 236
 237 static inline bool mem_cgroup_disabled(void)
 238 {
 239         return true;
 240 }
 241
 242 static inline bool mem_cgroup_oom_called(struct task_struct *task)
 243 {
 244         return false;
 245 }
 246
 247 static inline int
 248 mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg)
 249 {
 250         return 1;
 251 }
 252
 253 static inline unsigned long
 254 mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg, struct zone *zone,
 255                          enum lru_list lru)
 256 {
 257         return 0;
 258 }
 259
 260
 261 static inline struct zone_reclaim_stat*
 262 mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg, struct zone *zone)
 263 {
 264         return NULL;
 265 }
 266
 267 static inline struct zone_reclaim_stat*
 268 mem_cgroup_get_reclaim_stat_from_page(struct page *page)
 269 {
 270         return NULL;
 271 }
 272
 273 #endif /* CONFIG_CGROUP_MEM_CONT */
 274
 275 #endif /* _LINUX_MEMCONTROL_H */
 276