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_shmem_charge_fallback(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(rcu_dereference((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_get_reclaim_priority(struct mem_cgroup *mem);
  92 extern void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem,
  93                                                         int priority);
  94 extern void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem,
  95                                                         int priority);
  96 int mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg);
  97 unsigned long mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg,
  98                                        struct zone *zone,
  99                                        enum lru_list lru);
 100 struct zone_reclaim_stat *mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg,
 101                                                       struct zone *zone);
 102 struct zone_reclaim_stat*
 103 mem_cgroup_get_reclaim_stat_from_page(struct page *page);
 104 extern void mem_cgroup_print_oom_info(struct mem_cgroup *memcg,
 105                                         struct task_struct *p);
 106
 107 #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
 108 extern int do_swap_account;
 109 #endif
 110
 111 static inline bool mem_cgroup_disabled(void)
 112 {
 113         if (mem_cgroup_subsys.disabled)
 114                 return true;
 115         return false;
 116 }
 117
 118 extern bool mem_cgroup_oom_called(struct task_struct *task);
 119
 120 #else /* CONFIG_CGROUP_MEM_RES_CTLR */
 121 struct mem_cgroup;
 122
 123 static inline int mem_cgroup_newpage_charge(struct page *page,
 124                                         struct mm_struct *mm, gfp_t gfp_mask)
 125 {
 126         return 0;
 127 }
 128
 129 static inline int mem_cgroup_cache_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_try_charge_swapin(struct mm_struct *mm,
 136                 struct page *page, gfp_t gfp_mask, struct mem_cgroup **ptr)
 137 {
 138         return 0;
 139 }
 140
 141 static inline void mem_cgroup_commit_charge_swapin(struct page *page,
 142                                           struct mem_cgroup *ptr)
 143 {
 144 }
 145
 146 static inline void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr)
 147 {
 148 }
 149
 150 static inline void mem_cgroup_uncharge_page(struct page *page)
 151 {
 152 }
 153
 154 static inline void mem_cgroup_uncharge_cache_page(struct page *page)
 155 {
 156 }
 157
 158 static inline int mem_cgroup_shmem_charge_fallback(struct page *page,
 159                         struct mm_struct *mm, gfp_t gfp_mask)
 160 {
 161         return 0;
 162 }
 163
 164 static inline void mem_cgroup_add_lru_list(struct page *page, int lru)
 165 {
 166 }
 167
 168 static inline void mem_cgroup_del_lru_list(struct page *page, int lru)
 169 {
 170         return ;
 171 }
 172
 173 static inline void mem_cgroup_rotate_lru_list(struct page *page, int lru)
 174 {
 175         return ;
 176 }
 177
 178 static inline void mem_cgroup_del_lru(struct page *page)
 179 {
 180         return ;
 181 }
 182
 183 static inline void
 184 mem_cgroup_move_lists(struct page *page, enum lru_list from, enum lru_list to)
 185 {
 186 }
 187
 188 static inline int mm_match_cgroup(struct mm_struct *mm, struct mem_cgroup *mem)
 189 {
 190         return 1;
 191 }
 192
 193 static inline int task_in_mem_cgroup(struct task_struct *task,
 194                                      const struct mem_cgroup *mem)
 195 {
 196         return 1;
 197 }
 198
 199 static inline int
 200 mem_cgroup_prepare_migration(struct page *page, struct mem_cgroup **ptr)
 201 {
 202         return 0;
 203 }
 204
 205 static inline void mem_cgroup_end_migration(struct mem_cgroup *mem,
 206                                         struct page *oldpage,
 207                                         struct page *newpage)
 208 {
 209 }
 210
 211 static inline int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem)
 212 {
 213         return 0;
 214 }
 215
 216 static inline void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem,
 217                                                 int priority)
 218 {
 219 }
 220
 221 static inline void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem,
 222                                                 int priority)
 223 {
 224 }
 225
 226 static inline bool mem_cgroup_disabled(void)
 227 {
 228         return true;
 229 }
 230
 231 static inline bool mem_cgroup_oom_called(struct task_struct *task)
 232 {
 233         return false;
 234 }
 235
 236 static inline int
 237 mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg)
 238 {
 239         return 1;
 240 }
 241
 242 static inline unsigned long
 243 mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg, struct zone *zone,
 244                          enum lru_list lru)
 245 {
 246         return 0;
 247 }
 248
 249
 250 static inline struct zone_reclaim_stat*
 251 mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg, struct zone *zone)
 252 {
 253         return NULL;
 254 }
 255
 256 static inline struct zone_reclaim_stat*
 257 mem_cgroup_get_reclaim_stat_from_page(struct page *page)
 258 {
 259         return NULL;
 260 }
 261
 262 static inline void
 263 mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
 264 {
 265 }
 266
 267 #endif /* CONFIG_CGROUP_MEM_CONT */
 268
 269 #endif /* _LINUX_MEMCONTROL_H */
 270