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 #include <linux/rcupdate.h>
  24 #include <linux/mm.h>
  25
  26 struct mem_cgroup;
  27 struct page_cgroup;
  28 struct page;
  29 struct mm_struct;
  30
  31 #ifdef CONFIG_CGROUP_MEM_CONT
  32
  33 extern void mm_init_cgroup(struct mm_struct *mm, struct task_struct *p);
  34 extern void mm_free_cgroup(struct mm_struct *mm);
  35 extern void page_assign_page_cgroup(struct page *page,
  36                                         struct page_cgroup *pc);
  37 extern struct page_cgroup *page_get_page_cgroup(struct page *page);
  38 extern int mem_cgroup_charge(struct page *page, struct mm_struct *mm,
  39                                 gfp_t gfp_mask);
  40 extern void mem_cgroup_uncharge(struct page_cgroup *pc);
  41 extern void mem_cgroup_move_lists(struct page_cgroup *pc, bool active);
  42 extern unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,
  43                                         struct list_head *dst,
  44                                         unsigned long *scanned, int order,
  45                                         int mode, struct zone *z,
  46                                         struct mem_cgroup *mem_cont,
  47                                         int active);
  48 extern void mem_cgroup_out_of_memory(struct mem_cgroup *mem, gfp_t gfp_mask);
  49 extern int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
  50                                         gfp_t gfp_mask);
  51 int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem);
  52
  53 static inline struct mem_cgroup *mm_cgroup(const struct mm_struct *mm)
  54 {
  55         return rcu_dereference(mm->mem_cgroup);
  56 }
  57
  58 static inline void mem_cgroup_uncharge_page(struct page *page)
  59 {
  60         mem_cgroup_uncharge(page_get_page_cgroup(page));
  61 }
  62
  63 extern int mem_cgroup_prepare_migration(struct page *page);
  64 extern void mem_cgroup_end_migration(struct page *page);
  65 extern void mem_cgroup_page_migration(struct page *page, struct page *newpage);
  66
  67 #else /* CONFIG_CGROUP_MEM_CONT */
  68 static inline void mm_init_cgroup(struct mm_struct *mm,
  69                                         struct task_struct *p)
  70 {
  71 }
  72
  73 static inline void mm_free_cgroup(struct mm_struct *mm)
  74 {
  75 }
  76
  77 static inline void page_assign_page_cgroup(struct page *page,
  78                                                 struct page_cgroup *pc)
  79 {
  80 }
  81
  82 static inline struct page_cgroup *page_get_page_cgroup(struct page *page)
  83 {
  84         return NULL;
  85 }
  86
  87 static inline int mem_cgroup_charge(struct page *page, struct mm_struct *mm,
  88                                         gfp_t gfp_mask)
  89 {
  90         return 0;
  91 }
  92
  93 static inline void mem_cgroup_uncharge(struct page_cgroup *pc)
  94 {
  95 }
  96
  97 static inline void mem_cgroup_uncharge_page(struct page *page)
  98 {
  99 }
 100
 101 static inline void mem_cgroup_move_lists(struct page_cgroup *pc,
 102                                                 bool active)
 103 {
 104 }
 105
 106 static inline int mem_cgroup_cache_charge(struct page *page,
 107                                                 struct mm_struct *mm,
 108                                                 gfp_t gfp_mask)
 109 {
 110         return 0;
 111 }
 112
 113 static inline struct mem_cgroup *mm_cgroup(const struct mm_struct *mm)
 114 {
 115         return NULL;
 116 }
 117
 118 static inline int task_in_mem_cgroup(struct task_struct *task,
 119                                      const struct mem_cgroup *mem)
 120 {
 121         return 1;
 122 }
 123
 124 static inline int mem_cgroup_prepare_migration(struct page *page)
 125 {
 126         return 0;
 127 }
 128
 129 static inline void mem_cgroup_end_migration(struct page *page)
 130 {
 131 }
 132
 133 static inline void
 134 mem_cgroup_page_migration(struct page *page, struct page *newpage)
 135 {
 136 }
 137
 138
 139 #endif /* CONFIG_CGROUP_MEM_CONT */
 140
 141 #endif /* _LINUX_MEMCONTROL_H */
 142