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52d4b9ac KH |
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 __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); | |
23 | ||
24 | enum { | |
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 */ | |
33 | }; | |
34 | ||
35 | #define TESTPCGFLAG(uname, lname) \ | |
36 | static inline int PageCgroup##uname(struct page_cgroup *pc) \ | |
37 | { return test_bit(PCG_##lname, &pc->flags); } | |
38 | ||
39 | #define SETPCGFLAG(uname, lname) \ | |
40 | static inline void SetPageCgroup##uname(struct page_cgroup *pc)\ | |
41 | { set_bit(PCG_##lname, &pc->flags); } | |
42 | ||
43 | #define CLEARPCGFLAG(uname, lname) \ | |
44 | static inline void ClearPageCgroup##uname(struct page_cgroup *pc) \ | |
45 | { clear_bit(PCG_##lname, &pc->flags); } | |
46 | ||
47 | /* Cache flag is set only once (at allocation) */ | |
48 | TESTPCGFLAG(Cache, CACHE) | |
49 | ||
50 | TESTPCGFLAG(Used, USED) | |
51 | CLEARPCGFLAG(Used, USED) | |
52 | ||
53 | /* LRU management flags (from global-lru definition) */ | |
54 | TESTPCGFLAG(File, FILE) | |
55 | SETPCGFLAG(File, FILE) | |
56 | CLEARPCGFLAG(File, FILE) | |
57 | ||
58 | TESTPCGFLAG(Active, ACTIVE) | |
59 | SETPCGFLAG(Active, ACTIVE) | |
60 | CLEARPCGFLAG(Active, ACTIVE) | |
61 | ||
62 | TESTPCGFLAG(Unevictable, UNEVICTABLE) | |
63 | SETPCGFLAG(Unevictable, UNEVICTABLE) | |
64 | CLEARPCGFLAG(Unevictable, UNEVICTABLE) | |
65 | ||
66 | static inline int page_cgroup_nid(struct page_cgroup *pc) | |
67 | { | |
68 | return page_to_nid(pc->page); | |
69 | } | |
70 | ||
71 | static inline enum zone_type page_cgroup_zid(struct page_cgroup *pc) | |
72 | { | |
73 | return page_zonenum(pc->page); | |
74 | } | |
75 | ||
76 | static inline void lock_page_cgroup(struct page_cgroup *pc) | |
77 | { | |
78 | bit_spin_lock(PCG_LOCK, &pc->flags); | |
79 | } | |
80 | ||
81 | static inline int trylock_page_cgroup(struct page_cgroup *pc) | |
82 | { | |
83 | return bit_spin_trylock(PCG_LOCK, &pc->flags); | |
84 | } | |
85 | ||
86 | static inline void unlock_page_cgroup(struct page_cgroup *pc) | |
87 | { | |
88 | bit_spin_unlock(PCG_LOCK, &pc->flags); | |
89 | } | |
90 | ||
91 | #else /* CONFIG_CGROUP_MEM_RES_CTLR */ | |
92 | struct page_cgroup; | |
93 | ||
94 | static inline void pgdat_page_cgroup_init(struct pglist_data *pgdat) | |
95 | { | |
96 | } | |
97 | ||
98 | static inline struct page_cgroup *lookup_page_cgroup(struct page *page) | |
99 | { | |
100 | return NULL; | |
101 | } | |
102 | #endif | |
103 | #endif |