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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 | #ifndef __LINUX_PAGE_CGROUP_H
#define __LINUX_PAGE_CGROUP_H
enum {
/* flags for mem_cgroup */
PCG_LOCK, /* Lock for pc->mem_cgroup and following bits. */
PCG_USED, /* this object is in use. */
PCG_MIGRATION, /* under page migration */
__NR_PCG_FLAGS,
};
#ifndef __GENERATING_BOUNDS_H
#include <generated/bounds.h>
#ifdef CONFIG_MEMCG
#include <linux/bit_spinlock.h>
/*
* Page Cgroup can be considered as an extended mem_map.
* A page_cgroup page is associated with every page descriptor. The
* page_cgroup helps us identify information about the cgroup
* All page cgroups are allocated at boot or memory hotplug event,
* then the page cgroup for pfn always exists.
*/
struct page_cgroup {
unsigned long flags;
struct mem_cgroup *mem_cgroup;
};
void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat);
#ifdef CONFIG_SPARSEMEM
static inline void __init page_cgroup_init_flatmem(void)
{
}
extern void __init page_cgroup_init(void);
#else
void __init page_cgroup_init_flatmem(void);
static inline void __init page_cgroup_init(void)
{
}
#endif
struct page_cgroup *lookup_page_cgroup(struct page *page);
struct page *lookup_cgroup_page(struct page_cgroup *pc);
#define TESTPCGFLAG(uname, lname) \
static inline int PageCgroup##uname(struct page_cgroup *pc) \
{ return test_bit(PCG_##lname, &pc->flags); }
#define SETPCGFLAG(uname, lname) \
static inline void SetPageCgroup##uname(struct page_cgroup *pc)\
{ set_bit(PCG_##lname, &pc->flags); }
#define CLEARPCGFLAG(uname, lname) \
static inline void ClearPageCgroup##uname(struct page_cgroup *pc) \
{ clear_bit(PCG_##lname, &pc->flags); }
#define TESTCLEARPCGFLAG(uname, lname) \
static inline int TestClearPageCgroup##uname(struct page_cgroup *pc) \
{ return test_and_clear_bit(PCG_##lname, &pc->flags); }
TESTPCGFLAG(Used, USED)
CLEARPCGFLAG(Used, USED)
SETPCGFLAG(Used, USED)
SETPCGFLAG(Migration, MIGRATION)
CLEARPCGFLAG(Migration, MIGRATION)
TESTPCGFLAG(Migration, MIGRATION)
static inline void lock_page_cgroup(struct page_cgroup *pc)
{
/*
* Don't take this lock in IRQ context.
* This lock is for pc->mem_cgroup, USED, MIGRATION
*/
bit_spin_lock(PCG_LOCK, &pc->flags);
}
static inline void unlock_page_cgroup(struct page_cgroup *pc)
{
bit_spin_unlock(PCG_LOCK, &pc->flags);
}
#else /* CONFIG_MEMCG */
struct page_cgroup;
static inline void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat)
{
}
static inline struct page_cgroup *lookup_page_cgroup(struct page *page)
{
return NULL;
}
static inline void page_cgroup_init(void)
{
}
static inline void __init page_cgroup_init_flatmem(void)
{
}
#endif /* CONFIG_MEMCG */
#include <linux/swap.h>
#ifdef CONFIG_MEMCG_SWAP
extern unsigned short swap_cgroup_cmpxchg(swp_entry_t ent,
unsigned short old, unsigned short new);
extern unsigned short swap_cgroup_record(swp_entry_t ent, unsigned short id);
extern unsigned short lookup_swap_cgroup_id(swp_entry_t ent);
extern int swap_cgroup_swapon(int type, unsigned long max_pages);
extern void swap_cgroup_swapoff(int type);
#else
static inline
unsigned short swap_cgroup_record(swp_entry_t ent, unsigned short id)
{
return 0;
}
static inline
unsigned short lookup_swap_cgroup_id(swp_entry_t ent)
{
return 0;
}
static inline int
swap_cgroup_swapon(int type, unsigned long max_pages)
{
return 0;
}
static inline void swap_cgroup_swapoff(int type)
{
return;
}
#endif /* CONFIG_MEMCG_SWAP */
#endif /* !__GENERATING_BOUNDS_H */
#endif /* __LINUX_PAGE_CGROUP_H */
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