1 #ifndef __LINUX_PAGE_CGROUP_H
2 #define __LINUX_PAGE_CGROUP_H
4 #ifdef CONFIG_CGROUP_MEM_RES_CTLR
5 #include <linux/bit_spinlock.h>
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.
15 struct mem_cgroup
*mem_cgroup
;
17 struct list_head lru
; /* per cgroup LRU list */
20 void __meminit
pgdat_page_cgroup_init(struct pglist_data
*pgdat
);
21 void __init
page_cgroup_init(void);
22 struct page_cgroup
*lookup_page_cgroup(struct page
*page
);
25 /* flags for mem_cgroup */
26 PCG_LOCK
, /* page cgroup is locked */
27 PCG_CACHE
, /* charged as cache */
28 PCG_USED
, /* this object is in use. */
31 #define TESTPCGFLAG(uname, lname) \
32 static inline int PageCgroup##uname(struct page_cgroup *pc) \
33 { return test_bit(PCG_##lname, &pc->flags); }
35 #define SETPCGFLAG(uname, lname) \
36 static inline void SetPageCgroup##uname(struct page_cgroup *pc)\
37 { set_bit(PCG_##lname, &pc->flags); }
39 #define CLEARPCGFLAG(uname, lname) \
40 static inline void ClearPageCgroup##uname(struct page_cgroup *pc) \
41 { clear_bit(PCG_##lname, &pc->flags); }
43 /* Cache flag is set only once (at allocation) */
44 TESTPCGFLAG(Cache
, CACHE
)
46 TESTPCGFLAG(Used
, USED
)
47 CLEARPCGFLAG(Used
, USED
)
49 static inline int page_cgroup_nid(struct page_cgroup
*pc
)
51 return page_to_nid(pc
->page
);
54 static inline enum zone_type
page_cgroup_zid(struct page_cgroup
*pc
)
56 return page_zonenum(pc
->page
);
59 static inline void lock_page_cgroup(struct page_cgroup
*pc
)
61 bit_spin_lock(PCG_LOCK
, &pc
->flags
);
64 static inline int trylock_page_cgroup(struct page_cgroup
*pc
)
66 return bit_spin_trylock(PCG_LOCK
, &pc
->flags
);
69 static inline void unlock_page_cgroup(struct page_cgroup
*pc
)
71 bit_spin_unlock(PCG_LOCK
, &pc
->flags
);
74 #else /* CONFIG_CGROUP_MEM_RES_CTLR */
77 static inline void __meminit
pgdat_page_cgroup_init(struct pglist_data
*pgdat
)
81 static inline struct page_cgroup
*lookup_page_cgroup(struct page
*page
)
86 static inline void page_cgroup_init(void)
92 #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
93 #include <linux/swap.h>
94 extern struct mem_cgroup
*
95 swap_cgroup_record(swp_entry_t ent
, struct mem_cgroup
*mem
);
96 extern struct mem_cgroup
*lookup_swap_cgroup(swp_entry_t ent
);
97 extern int swap_cgroup_swapon(int type
, unsigned long max_pages
);
98 extern void swap_cgroup_swapoff(int type
);
100 #include <linux/swap.h>
103 struct mem_cgroup
*swap_cgroup_record(swp_entry_t ent
, struct mem_cgroup
*mem
)
109 struct mem_cgroup
*lookup_swap_cgroup(swp_entry_t ent
)
115 swap_cgroup_swapon(int type
, unsigned long max_pages
)
120 static inline void swap_cgroup_swapoff(int type
)
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