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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 | ||
31168481 | 20 | void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat); |
52d4b9ac KH |
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. */ | |
52d4b9ac KH |
29 | }; |
30 | ||
31 | #define TESTPCGFLAG(uname, lname) \ | |
32 | static inline int PageCgroup##uname(struct page_cgroup *pc) \ | |
33 | { return test_bit(PCG_##lname, &pc->flags); } | |
34 | ||
35 | #define SETPCGFLAG(uname, lname) \ | |
36 | static inline void SetPageCgroup##uname(struct page_cgroup *pc)\ | |
37 | { set_bit(PCG_##lname, &pc->flags); } | |
38 | ||
39 | #define CLEARPCGFLAG(uname, lname) \ | |
40 | static inline void ClearPageCgroup##uname(struct page_cgroup *pc) \ | |
41 | { clear_bit(PCG_##lname, &pc->flags); } | |
42 | ||
43 | /* Cache flag is set only once (at allocation) */ | |
44 | TESTPCGFLAG(Cache, CACHE) | |
45 | ||
46 | TESTPCGFLAG(Used, USED) | |
47 | CLEARPCGFLAG(Used, USED) | |
48 | ||
52d4b9ac KH |
49 | static inline int page_cgroup_nid(struct page_cgroup *pc) |
50 | { | |
51 | return page_to_nid(pc->page); | |
52 | } | |
53 | ||
54 | static inline enum zone_type page_cgroup_zid(struct page_cgroup *pc) | |
55 | { | |
56 | return page_zonenum(pc->page); | |
57 | } | |
58 | ||
59 | static inline void lock_page_cgroup(struct page_cgroup *pc) | |
60 | { | |
61 | bit_spin_lock(PCG_LOCK, &pc->flags); | |
62 | } | |
63 | ||
64 | static inline int trylock_page_cgroup(struct page_cgroup *pc) | |
65 | { | |
66 | return bit_spin_trylock(PCG_LOCK, &pc->flags); | |
67 | } | |
68 | ||
69 | static inline void unlock_page_cgroup(struct page_cgroup *pc) | |
70 | { | |
71 | bit_spin_unlock(PCG_LOCK, &pc->flags); | |
72 | } | |
73 | ||
74 | #else /* CONFIG_CGROUP_MEM_RES_CTLR */ | |
75 | struct page_cgroup; | |
76 | ||
31168481 | 77 | static inline void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat) |
52d4b9ac KH |
78 | { |
79 | } | |
80 | ||
81 | static inline struct page_cgroup *lookup_page_cgroup(struct page *page) | |
82 | { | |
83 | return NULL; | |
84 | } | |
94b6da5a KH |
85 | |
86 | static inline void page_cgroup_init(void) | |
87 | { | |
88 | } | |
89 | ||
27a7faa0 KH |
90 | #endif |
91 | ||
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); | |
99 | #else | |
100 | #include <linux/swap.h> | |
101 | ||
102 | static inline | |
103 | struct mem_cgroup *swap_cgroup_record(swp_entry_t ent, struct mem_cgroup *mem) | |
104 | { | |
105 | return NULL; | |
106 | } | |
107 | ||
108 | static inline | |
109 | struct mem_cgroup *lookup_swap_cgroup(swp_entry_t ent) | |
110 | { | |
111 | return NULL; | |
112 | } | |
113 | ||
114 | static inline int | |
115 | swap_cgroup_swapon(int type, unsigned long max_pages) | |
116 | { | |
117 | return 0; | |
118 | } | |
119 | ||
120 | static inline void swap_cgroup_swapoff(int type) | |
121 | { | |
122 | return; | |
123 | } | |
124 | ||
52d4b9ac KH |
125 | #endif |
126 | #endif |