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 /*
  68  * For memory reclaim.
  69  */
  70 extern int mem_cgroup_calc_mapped_ratio(struct mem_cgroup *mem);
  71
  72
  73 #else /* CONFIG_CGROUP_MEM_CONT */
  74 static inline void mm_init_cgroup(struct mm_struct *mm,
  75                                         struct task_struct *p)
  76 {
  77 }
  78
  79 static inline void mm_free_cgroup(struct mm_struct *mm)
  80 {
  81 }
  82
  83 static inline void page_assign_page_cgroup(struct page *page,
  84                                                 struct page_cgroup *pc)
  85 {
  86 }
  87
  88 static inline struct page_cgroup *page_get_page_cgroup(struct page *page)
  89 {
  90         return NULL;
  91 }
  92
  93 static inline int mem_cgroup_charge(struct page *page, struct mm_struct *mm,
  94                                         gfp_t gfp_mask)
  95 {
  96         return 0;
  97 }
  98
  99 static inline void mem_cgroup_uncharge(struct page_cgroup *pc)
 100 {
 101 }
 102
 103 static inline void mem_cgroup_uncharge_page(struct page *page)
 104 {
 105 }
 106
 107 static inline void mem_cgroup_move_lists(struct page_cgroup *pc,
 108                                                 bool active)
 109 {
 110 }
 111
 112 static inline int mem_cgroup_cache_charge(struct page *page,
 113                                                 struct mm_struct *mm,
 114                                                 gfp_t gfp_mask)
 115 {
 116         return 0;
 117 }
 118
 119 static inline struct mem_cgroup *mm_cgroup(const struct mm_struct *mm)
 120 {
 121         return NULL;
 122 }
 123
 124 static inline int task_in_mem_cgroup(struct task_struct *task,
 125                                      const struct mem_cgroup *mem)
 126 {
 127         return 1;
 128 }
 129
 130 static inline int mem_cgroup_prepare_migration(struct page *page)
 131 {
 132         return 0;
 133 }
 134
 135 static inline void mem_cgroup_end_migration(struct page *page)
 136 {
 137 }
 138
 139 static inline void
 140 mem_cgroup_page_migration(struct page *page, struct page *newpage)
 141 {
 142 }
 143
 144 static inline int mem_cgroup_calc_mapped_ratio(struct mem_cgroup *mem)
 145 {
 146         return 0;
 147 }
 148 #endif /* CONFIG_CGROUP_MEM_CONT */
 149
 150 #endif /* _LINUX_MEMCONTROL_H */
 151