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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 __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat); |
21 | |
22 | #ifdef CONFIG_SPARSEMEM |
23 | static inline void __init page_cgroup_init_flatmem(void) |
24 | { |
25 | } |
26 | extern void __init page_cgroup_init(void); |
27 | #else |
28 | void __init page_cgroup_init_flatmem(void); |
29 | static inline void __init page_cgroup_init(void) |
30 | { |
31 | } |
32 | #endif |
33 | |
34 | struct page_cgroup *lookup_page_cgroup(struct page *page); |
35 | |
36 | enum { |
37 | /* flags for mem_cgroup */ |
38 | PCG_LOCK, /* page cgroup is locked */ |
39 | PCG_CACHE, /* charged as cache */ |
40 | PCG_USED, /* this object is in use. */ |
41 | PCG_ACCT_LRU, /* page has been accounted for */ |
42 | PCG_FILE_MAPPED, /* page is accounted as "mapped" */ |
43 | }; |
44 | |
45 | #define TESTPCGFLAG(uname, lname) \ |
46 | static inline int PageCgroup##uname(struct page_cgroup *pc) \ |
47 | { return test_bit(PCG_##lname, &pc->flags); } |
48 | |
49 | #define SETPCGFLAG(uname, lname) \ |
50 | static inline void SetPageCgroup##uname(struct page_cgroup *pc)\ |
51 | { set_bit(PCG_##lname, &pc->flags); } |
52 | |
53 | #define CLEARPCGFLAG(uname, lname) \ |
54 | static inline void ClearPageCgroup##uname(struct page_cgroup *pc) \ |
55 | { clear_bit(PCG_##lname, &pc->flags); } |
56 | |
57 | #define TESTCLEARPCGFLAG(uname, lname) \ |
58 | static inline int TestClearPageCgroup##uname(struct page_cgroup *pc) \ |
59 | { return test_and_clear_bit(PCG_##lname, &pc->flags); } |
60 | |
61 | TESTPCGFLAG(Locked, LOCK) |
62 | |
63 | /* Cache flag is set only once (at allocation) */ |
64 | TESTPCGFLAG(Cache, CACHE) |
65 | CLEARPCGFLAG(Cache, CACHE) |
66 | SETPCGFLAG(Cache, CACHE) |
67 | |
68 | TESTPCGFLAG(Used, USED) |
69 | CLEARPCGFLAG(Used, USED) |
70 | SETPCGFLAG(Used, USED) |
71 | |
72 | SETPCGFLAG(AcctLRU, ACCT_LRU) |
73 | CLEARPCGFLAG(AcctLRU, ACCT_LRU) |
74 | TESTPCGFLAG(AcctLRU, ACCT_LRU) |
75 | TESTCLEARPCGFLAG(AcctLRU, ACCT_LRU) |
76 | |
77 | |
78 | SETPCGFLAG(FileMapped, FILE_MAPPED) |
79 | CLEARPCGFLAG(FileMapped, FILE_MAPPED) |
80 | TESTPCGFLAG(FileMapped, FILE_MAPPED) |
81 | |
82 | static inline int page_cgroup_nid(struct page_cgroup *pc) |
83 | { |
84 | return page_to_nid(pc->page); |
85 | } |
86 | |
87 | static inline enum zone_type page_cgroup_zid(struct page_cgroup *pc) |
88 | { |
89 | return page_zonenum(pc->page); |
90 | } |
91 | |
92 | static inline void lock_page_cgroup(struct page_cgroup *pc) |
93 | { |
94 | bit_spin_lock(PCG_LOCK, &pc->flags); |
95 | } |
96 | |
97 | static inline void unlock_page_cgroup(struct page_cgroup *pc) |
98 | { |
99 | bit_spin_unlock(PCG_LOCK, &pc->flags); |
100 | } |
101 | |
102 | #else /* CONFIG_CGROUP_MEM_RES_CTLR */ |
103 | struct page_cgroup; |
104 | |
105 | static inline void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat) |
106 | { |
107 | } |
108 | |
109 | static inline struct page_cgroup *lookup_page_cgroup(struct page *page) |
110 | { |
111 | return NULL; |
112 | } |
113 | |
114 | static inline void page_cgroup_init(void) |
115 | { |
116 | } |
117 | |
118 | static inline void __init page_cgroup_init_flatmem(void) |
119 | { |
120 | } |
121 | |
122 | #endif |
123 | |
124 | #include <linux/swap.h> |
125 | |
126 | #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP |
127 | extern unsigned short swap_cgroup_cmpxchg(swp_entry_t ent, |
128 | unsigned short old, unsigned short new); |
129 | extern unsigned short swap_cgroup_record(swp_entry_t ent, unsigned short id); |
130 | extern unsigned short lookup_swap_cgroup(swp_entry_t ent); |
131 | extern int swap_cgroup_swapon(int type, unsigned long max_pages); |
132 | extern void swap_cgroup_swapoff(int type); |
133 | #else |
134 | |
135 | static inline |
136 | unsigned short swap_cgroup_record(swp_entry_t ent, unsigned short id) |
137 | { |
138 | return 0; |
139 | } |
140 | |
141 | static inline |
142 | unsigned short lookup_swap_cgroup(swp_entry_t ent) |
143 | { |
144 | return 0; |
145 | } |
146 | |
147 | static inline int |
148 | swap_cgroup_swapon(int type, unsigned long max_pages) |
149 | { |
150 | return 0; |
151 | } |
152 | |
153 | static inline void swap_cgroup_swapoff(int type) |
154 | { |
155 | return; |
156 | } |
157 | |
158 | #endif |
159 | #endif |
160 |
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