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(struct mm_struct *mm,
  44                 gfp_t gfp_mask, struct mem_cgroup **ptr);
  45 extern int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
  46                 struct page *page, gfp_t mask, struct mem_cgroup **ptr);
  47 extern void mem_cgroup_commit_charge_swapin(struct page *page,
  48                                         struct mem_cgroup *ptr);
  49 extern void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr);
  50
  51 extern int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
  52                                         gfp_t gfp_mask);
  53 extern void mem_cgroup_add_lru_list(struct page *page, enum lru_list lru);
  54 extern void mem_cgroup_del_lru_list(struct page *page, enum lru_list lru);
  55 extern void mem_cgroup_rotate_lru_list(struct page *page, enum lru_list lru);
  56 extern void mem_cgroup_del_lru(struct page *page);
  57 extern void mem_cgroup_move_lists(struct page *page,
  58                                   enum lru_list from, enum lru_list to);
  59 extern void mem_cgroup_uncharge_page(struct page *page);
  60 extern void mem_cgroup_uncharge_cache_page(struct page *page);
  61 extern int mem_cgroup_shrink_usage(struct mm_struct *mm, gfp_t gfp_mask);
  62
  63 extern unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,
  64                                         struct list_head *dst,
  65                                         unsigned long *scanned, int order,
  66                                         int mode, struct zone *z,
  67                                         struct mem_cgroup *mem_cont,
  68                                         int active, int file);
  69 extern void mem_cgroup_out_of_memory(struct mem_cgroup *mem, gfp_t gfp_mask);
  70 int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem);
  71
  72 extern struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p);
  73
  74 static inline
  75 int mm_match_cgroup(const struct mm_struct *mm, const struct mem_cgroup *cgroup)
  76 {
  77         struct mem_cgroup *mem;
  78         rcu_read_lock();
  79         mem = mem_cgroup_from_task((mm)->owner);
  80         rcu_read_unlock();
  81         return cgroup == mem;
  82 }
  83
  84 extern int
  85 mem_cgroup_prepare_migration(struct page *page, struct mem_cgroup **ptr);
  86 extern void mem_cgroup_end_migration(struct mem_cgroup *mem,
  87         struct page *oldpage, struct page *newpage);
  88
  89 /*
  90  * For memory reclaim.
  91  */
  92 extern int mem_cgroup_calc_mapped_ratio(struct mem_cgroup *mem);
  93 extern long mem_cgroup_reclaim_imbalance(struct mem_cgroup *mem);
  94
  95 extern int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem);
  96 extern void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem,
  97                                                         int priority);
  98 extern void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem,
  99                                                         int priority);
 100
 101 extern long mem_cgroup_calc_reclaim(struct mem_cgroup *mem, struct zone *zone,
 102                                         int priority, enum lru_list lru);
 103 int mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg,
 104                                     struct zone *zone);
 105 unsigned long mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg,
 106                                        struct zone *zone,
 107                                        enum lru_list lru);
 108 struct zone_reclaim_stat *mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg,
 109                                                       struct zone *zone);
 110 struct zone_reclaim_stat*
 111 mem_cgroup_get_reclaim_stat_from_page(struct page *page);
 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
 126 #else /* CONFIG_CGROUP_MEM_RES_CTLR */
 127 struct mem_cgroup;
 128
 129 static inline int mem_cgroup_newpage_charge(struct page *page,
 130                                         struct mm_struct *mm, gfp_t gfp_mask)
 131 {
 132         return 0;
 133 }
 134
 135 static inline int mem_cgroup_cache_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_try_charge(struct mm_struct *mm,
 142                         gfp_t gfp_mask, struct mem_cgroup **ptr)
 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_page(struct page *page)
 163 {
 164 }
 165
 166 static inline void mem_cgroup_uncharge_cache_page(struct page *page)
 167 {
 168 }
 169
 170 static inline int mem_cgroup_shrink_usage(struct mm_struct *mm, gfp_t gfp_mask)
 171 {
 172         return 0;
 173 }
 174
 175 static inline void mem_cgroup_add_lru_list(struct page *page, int lru)
 176 {
 177 }
 178
 179 static inline void mem_cgroup_del_lru_list(struct page *page, int lru)
 180 {
 181         return ;
 182 }
 183
 184 static inline void mem_cgroup_rotate_lru_list(struct page *page, int lru)
 185 {
 186         return ;
 187 }
 188
 189 static inline void mem_cgroup_del_lru(struct page *page)
 190 {
 191         return ;
 192 }
 193
 194 static inline void
 195 mem_cgroup_move_lists(struct page *page, enum lru_list from, enum lru_list to)
 196 {
 197 }
 198
 199 static inline int mm_match_cgroup(struct mm_struct *mm, struct mem_cgroup *mem)
 200 {
 201         return 1;
 202 }
 203
 204 static inline int task_in_mem_cgroup(struct task_struct *task,
 205                                      const struct mem_cgroup *mem)
 206 {
 207         return 1;
 208 }
 209
 210 static inline int
 211 mem_cgroup_prepare_migration(struct page *page, struct mem_cgroup **ptr)
 212 {
 213         return 0;
 214 }
 215
 216 static inline void mem_cgroup_end_migration(struct mem_cgroup *mem,
 217                                         struct page *oldpage,
 218                                         struct page *newpage)
 219 {
 220 }
 221
 222 static inline int mem_cgroup_calc_mapped_ratio(struct mem_cgroup *mem)
 223 {
 224         return 0;
 225 }
 226
 227 static inline int mem_cgroup_reclaim_imbalance(struct mem_cgroup *mem)
 228 {
 229         return 0;
 230 }
 231
 232 static inline int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem)
 233 {
 234         return 0;
 235 }
 236
 237 static inline void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem,
 238                                                 int priority)
 239 {
 240 }
 241
 242 static inline void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem,
 243                                                 int priority)
 244 {
 245 }
 246
 247 static inline long mem_cgroup_calc_reclaim(struct mem_cgroup *mem,
 248                                         struct zone *zone, int priority,
 249                                         enum lru_list lru)
 250 {
 251         return 0;
 252 }
 253
 254 static inline bool mem_cgroup_disabled(void)
 255 {
 256         return true;
 257 }
 258
 259 static inline bool mem_cgroup_oom_called(struct task_struct *task)
 260 {
 261         return false;
 262 }
 263
 264 static inline int
 265 mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg, struct zone *zone)
 266 {
 267         return 1;
 268 }
 269
 270 static inline unsigned long
 271 mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg, struct zone *zone,
 272                          enum lru_list lru)
 273 {
 274         return 0;
 275 }
 276
 277
 278 static inline struct zone_reclaim_stat*
 279 mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg, struct zone *zone)
 280 {
 281         return NULL;
 282 }
 283
 284 static inline struct zone_reclaim_stat*
 285 mem_cgroup_get_reclaim_stat_from_page(struct page *page)
 286 {
 287         return NULL;
 288 }
 289
 290 #endif /* CONFIG_CGROUP_MEM_CONT */
 291
 292 #endif /* _LINUX_MEMCONTROL_H */
 293