include/linux/page_cgroup.h

   1 #ifndef __LINUX_PAGE_CGROUP_H
   2 #define __LINUX_PAGE_CGROUP_H
   3
   4 #ifdef CONFIG_CGROUP_MEM_RES_CTLR
   5 #include <linux/bit_spinlock.h>
   6 /*
   7  * Page Cgroup can be considered as an extended mem_map.
   8  * A page_cgroup page is associated with every page descriptor. The
   9  * page_cgroup helps us identify information about the cgroup
  10  * All page cgroups are allocated at boot or memory hotplug event,
  11  * then the page cgroup for pfn always exists.
  12  */
  13 struct page_cgroup {
  14         unsigned long flags;
  15         struct mem_cgroup *mem_cgroup;
  16         struct page *page;
  17         struct list_head lru;           /* per cgroup LRU list */
  18 };
  19
  20 void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat);
  21
  22 #ifdef CONFIG_SPARSEMEM
  23 static inline void __init page_cgroup_init_flatmem(void)
  24 {
  25 }
  26 extern void __init page_cgroup_init(void);
  27 #else
  28 void __init page_cgroup_init_flatmem(void);
  29 static inline void __init page_cgroup_init(void)
  30 {
  31 }
  32 #endif
  33
  34 struct page_cgroup *lookup_page_cgroup(struct page *page);
  35
  36 enum {
  37         /* flags for mem_cgroup */
  38         PCG_LOCK,  /* page cgroup is locked */
  39         PCG_CACHE, /* charged as cache */
  40         PCG_USED, /* this object is in use. */
  41         PCG_ACCT_LRU, /* page has been accounted for */
  42 };
  43
  44 #define TESTPCGFLAG(uname, lname)                       \
  45 static inline int PageCgroup##uname(struct page_cgroup *pc)     \
  46         { return test_bit(PCG_##lname, &pc->flags); }
  47
  48 #define SETPCGFLAG(uname, lname)                        \
  49 static inline void SetPageCgroup##uname(struct page_cgroup *pc)\
  50         { set_bit(PCG_##lname, &pc->flags);  }
  51
  52 #define CLEARPCGFLAG(uname, lname)                      \
  53 static inline void ClearPageCgroup##uname(struct page_cgroup *pc)       \
  54         { clear_bit(PCG_##lname, &pc->flags);  }
  55
  56 #define TESTCLEARPCGFLAG(uname, lname)                  \
  57 static inline int TestClearPageCgroup##uname(struct page_cgroup *pc)    \
  58         { return test_and_clear_bit(PCG_##lname, &pc->flags);  }
  59
  60 /* Cache flag is set only once (at allocation) */
  61 TESTPCGFLAG(Cache, CACHE)
  62 CLEARPCGFLAG(Cache, CACHE)
  63 SETPCGFLAG(Cache, CACHE)
  64
  65 TESTPCGFLAG(Used, USED)
  66 CLEARPCGFLAG(Used, USED)
  67 SETPCGFLAG(Used, USED)
  68
  69 SETPCGFLAG(AcctLRU, ACCT_LRU)
  70 CLEARPCGFLAG(AcctLRU, ACCT_LRU)
  71 TESTPCGFLAG(AcctLRU, ACCT_LRU)
  72 TESTCLEARPCGFLAG(AcctLRU, ACCT_LRU)
  73
  74 static inline int page_cgroup_nid(struct page_cgroup *pc)
  75 {
  76         return page_to_nid(pc->page);
  77 }
  78
  79 static inline enum zone_type page_cgroup_zid(struct page_cgroup *pc)
  80 {
  81         return page_zonenum(pc->page);
  82 }
  83
  84 static inline void lock_page_cgroup(struct page_cgroup *pc)
  85 {
  86         bit_spin_lock(PCG_LOCK, &pc->flags);
  87 }
  88
  89 static inline int trylock_page_cgroup(struct page_cgroup *pc)
  90 {
  91         return bit_spin_trylock(PCG_LOCK, &pc->flags);
  92 }
  93
  94 static inline void unlock_page_cgroup(struct page_cgroup *pc)
  95 {
  96         bit_spin_unlock(PCG_LOCK, &pc->flags);
  97 }
  98
  99 #else /* CONFIG_CGROUP_MEM_RES_CTLR */
 100 struct page_cgroup;
 101
 102 static inline void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat)
 103 {
 104 }
 105
 106 static inline struct page_cgroup *lookup_page_cgroup(struct page *page)
 107 {
 108         return NULL;
 109 }
 110
 111 static inline void page_cgroup_init(void)
 112 {
 113 }
 114
 115 static inline void __init page_cgroup_init_flatmem(void)
 116 {
 117 }
 118
 119 #endif
 120
 121 #include <linux/swap.h>
 122
 123 #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
 124 extern unsigned short swap_cgroup_record(swp_entry_t ent, unsigned short id);
 125 extern unsigned short lookup_swap_cgroup(swp_entry_t ent);
 126 extern int swap_cgroup_swapon(int type, unsigned long max_pages);
 127 extern void swap_cgroup_swapoff(int type);
 128 #else
 129
 130 static inline
 131 unsigned short swap_cgroup_record(swp_entry_t ent, unsigned short id)
 132 {
 133         return 0;
 134 }
 135
 136 static inline
 137 unsigned short lookup_swap_cgroup(swp_entry_t ent)
 138 {
 139         return 0;
 140 }
 141
 142 static inline int
 143 swap_cgroup_swapon(int type, unsigned long max_pages)
 144 {
 145         return 0;
 146 }
 147
 148 static inline void swap_cgroup_swapoff(int type)
 149 {
 150         return;
 151 }
 152
 153 #endif
 154 #endif