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
  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 extern int mem_cgroup_newpage_charge(struct page *page, struct mm_struct *mm,
  31                                 gfp_t gfp_mask);
  32 /* for swap handling */
  33 extern int mem_cgroup_try_charge(struct mm_struct *mm,
  34                 gfp_t gfp_mask, struct mem_cgroup **ptr);
  35 extern void mem_cgroup_commit_charge_swapin(struct page *page,
  36                                         struct mem_cgroup *ptr);
  37 extern void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr);
  38
  39 extern int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
  40                                         gfp_t gfp_mask);
  41 extern void mem_cgroup_move_lists(struct page *page, enum lru_list lru);
  42 extern void mem_cgroup_uncharge_page(struct page *page);
  43 extern void mem_cgroup_uncharge_cache_page(struct page *page);
  44 extern int mem_cgroup_shrink_usage(struct mm_struct *mm, gfp_t gfp_mask);
  45
  46 extern unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,
  47                                         struct list_head *dst,
  48                                         unsigned long *scanned, int order,
  49                                         int mode, struct zone *z,
  50                                         struct mem_cgroup *mem_cont,
  51                                         int active, int file);
  52 extern void mem_cgroup_out_of_memory(struct mem_cgroup *mem, gfp_t gfp_mask);
  53 int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem);
  54
  55 extern struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p);
  56
  57 #define mm_match_cgroup(mm, cgroup)     \
  58         ((cgroup) == mem_cgroup_from_task((mm)->owner))
  59
  60 extern int
  61 mem_cgroup_prepare_migration(struct page *page, struct mem_cgroup **ptr);
  62 extern void mem_cgroup_end_migration(struct mem_cgroup *mem,
  63         struct page *oldpage, struct page *newpage);
  64
  65 /*
  66  * For memory reclaim.
  67  */
  68 extern int mem_cgroup_calc_mapped_ratio(struct mem_cgroup *mem);
  69 extern long mem_cgroup_reclaim_imbalance(struct mem_cgroup *mem);
  70
  71 extern int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem);
  72 extern void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem,
  73                                                         int priority);
  74 extern void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem,
  75                                                         int priority);
  76
  77 extern long mem_cgroup_calc_reclaim(struct mem_cgroup *mem, struct zone *zone,
  78                                         int priority, enum lru_list lru);
  79
  80 #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
  81 extern int do_swap_account;
  82 #endif
  83
  84 #else /* CONFIG_CGROUP_MEM_RES_CTLR */
  85 struct mem_cgroup;
  86
  87 static inline int mem_cgroup_newpage_charge(struct page *page,
  88                                         struct mm_struct *mm, gfp_t gfp_mask)
  89 {
  90         return 0;
  91 }
  92
  93 static inline int mem_cgroup_cache_charge(struct page *page,
  94                                         struct mm_struct *mm, gfp_t gfp_mask)
  95 {
  96         return 0;
  97 }
  98
  99 static inline int mem_cgroup_try_charge(struct mm_struct *mm,
 100                                 gfp_t gfp_mask, struct mem_cgroup **ptr)
 101 {
 102         return 0;
 103 }
 104
 105 static inline void mem_cgroup_commit_charge_swapin(struct page *page,
 106                                           struct mem_cgroup *ptr)
 107 {
 108 }
 109
 110 static inline void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr)
 111 {
 112 }
 113
 114 static inline void mem_cgroup_uncharge_page(struct page *page)
 115 {
 116 }
 117
 118 static inline void mem_cgroup_uncharge_cache_page(struct page *page)
 119 {
 120 }
 121
 122 static inline int mem_cgroup_shrink_usage(struct mm_struct *mm, gfp_t gfp_mask)
 123 {
 124         return 0;
 125 }
 126
 127 static inline void mem_cgroup_move_lists(struct page *page, bool active)
 128 {
 129 }
 130
 131 static inline int mm_match_cgroup(struct mm_struct *mm, struct mem_cgroup *mem)
 132 {
 133         return 1;
 134 }
 135
 136 static inline int task_in_mem_cgroup(struct task_struct *task,
 137                                      const struct mem_cgroup *mem)
 138 {
 139         return 1;
 140 }
 141
 142 static inline int
 143 mem_cgroup_prepare_migration(struct page *page, struct mem_cgroup **ptr)
 144 {
 145         return 0;
 146 }
 147
 148 static inline void mem_cgroup_end_migration(struct mem_cgroup *mem,
 149                                         struct page *oldpage,
 150                                         struct page *newpage)
 151 {
 152 }
 153
 154 static inline int mem_cgroup_calc_mapped_ratio(struct mem_cgroup *mem)
 155 {
 156         return 0;
 157 }
 158
 159 static inline int mem_cgroup_reclaim_imbalance(struct mem_cgroup *mem)
 160 {
 161         return 0;
 162 }
 163
 164 static inline int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem)
 165 {
 166         return 0;
 167 }
 168
 169 static inline void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem,
 170                                                 int priority)
 171 {
 172 }
 173
 174 static inline void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem,
 175                                                 int priority)
 176 {
 177 }
 178
 179 static inline long mem_cgroup_calc_reclaim(struct mem_cgroup *mem,
 180                                         struct zone *zone, int priority,
 181                                         enum lru_list lru)
 182 {
 183         return 0;
 184 }
 185 #endif /* CONFIG_CGROUP_MEM_CONT */
 186
 187 #endif /* _LINUX_MEMCONTROL_H */
 188