diff options
Diffstat (limited to 'include/linux/page_cgroup.h')
-rw-r--r-- | include/linux/page_cgroup.h | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/include/linux/page_cgroup.h b/include/linux/page_cgroup.h new file mode 100644 index 00000000000..f546ad6fc02 --- /dev/null +++ b/include/linux/page_cgroup.h | |||
@@ -0,0 +1,108 @@ | |||
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 | |||
103 | static inline void page_cgroup_init(void) | ||
104 | { | ||
105 | } | ||
106 | |||
107 | #endif | ||
108 | #endif | ||