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 __init 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. */
29 /* flags for LRU placement */
30 PCG_ACTIVE, /* page is active in this cgroup */
31 PCG_FILE, /* page is file system backed */
32 PCG_UNEVICTABLE, /* page is unevictableable */
35 #define TESTPCGFLAG(uname, lname) \
36 static inline int PageCgroup##uname(struct page_cgroup *pc) \
37 { return test_bit(PCG_##lname, &pc->flags); }
39 #define SETPCGFLAG(uname, lname) \
40 static inline void SetPageCgroup##uname(struct page_cgroup *pc)\
41 { set_bit(PCG_##lname, &pc->flags); }
43 #define CLEARPCGFLAG(uname, lname) \
44 static inline void ClearPageCgroup##uname(struct page_cgroup *pc) \
45 { clear_bit(PCG_##lname, &pc->flags); }
47 /* Cache flag is set only once (at allocation) */
48 TESTPCGFLAG(Cache, CACHE)
50 TESTPCGFLAG(Used, USED)
51 CLEARPCGFLAG(Used, USED)
53 /* LRU management flags (from global-lru definition) */
54 TESTPCGFLAG(File, FILE)
55 SETPCGFLAG(File, FILE)
56 CLEARPCGFLAG(File, FILE)
58 TESTPCGFLAG(Active, ACTIVE)
59 SETPCGFLAG(Active, ACTIVE)
60 CLEARPCGFLAG(Active, ACTIVE)
62 TESTPCGFLAG(Unevictable, UNEVICTABLE)
63 SETPCGFLAG(Unevictable, UNEVICTABLE)
64 CLEARPCGFLAG(Unevictable, UNEVICTABLE)
66 static inline int page_cgroup_nid(struct page_cgroup *pc)
68 return page_to_nid(pc->page);
71 static inline enum zone_type page_cgroup_zid(struct page_cgroup *pc)
73 return page_zonenum(pc->page);
76 static inline void lock_page_cgroup(struct page_cgroup *pc)
78 bit_spin_lock(PCG_LOCK, &pc->flags);
81 static inline int trylock_page_cgroup(struct page_cgroup *pc)
83 return bit_spin_trylock(PCG_LOCK, &pc->flags);
86 static inline void unlock_page_cgroup(struct page_cgroup *pc)
88 bit_spin_unlock(PCG_LOCK, &pc->flags);
91 #else /* CONFIG_CGROUP_MEM_RES_CTLR */
94 static inline void pgdat_page_cgroup_init(struct pglist_data *pgdat)
98 static inline struct page_cgroup *lookup_page_cgroup(struct page *page)
103 static inline void page_cgroup_init(void)