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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 | PCG_MIGRATION, /* under page migration */ | |
44 | }; | |
45 | ||
46 | #define TESTPCGFLAG(uname, lname) \ | |
47 | static inline int PageCgroup##uname(struct page_cgroup *pc) \ | |
48 | { return test_bit(PCG_##lname, &pc->flags); } | |
49 | ||
50 | #define SETPCGFLAG(uname, lname) \ | |
51 | static inline void SetPageCgroup##uname(struct page_cgroup *pc)\ | |
52 | { set_bit(PCG_##lname, &pc->flags); } | |
53 | ||
54 | #define CLEARPCGFLAG(uname, lname) \ | |
55 | static inline void ClearPageCgroup##uname(struct page_cgroup *pc) \ | |
56 | { clear_bit(PCG_##lname, &pc->flags); } | |
57 | ||
58 | #define TESTCLEARPCGFLAG(uname, lname) \ | |
59 | static inline int TestClearPageCgroup##uname(struct page_cgroup *pc) \ | |
60 | { return test_and_clear_bit(PCG_##lname, &pc->flags); } | |
61 | ||
62 | TESTPCGFLAG(Locked, LOCK) | |
63 | ||
64 | /* Cache flag is set only once (at allocation) */ | |
65 | TESTPCGFLAG(Cache, CACHE) | |
66 | CLEARPCGFLAG(Cache, CACHE) | |
67 | SETPCGFLAG(Cache, CACHE) | |
68 | ||
69 | TESTPCGFLAG(Used, USED) | |
70 | CLEARPCGFLAG(Used, USED) | |
71 | SETPCGFLAG(Used, USED) | |
72 | ||
73 | SETPCGFLAG(AcctLRU, ACCT_LRU) | |
74 | CLEARPCGFLAG(AcctLRU, ACCT_LRU) | |
75 | TESTPCGFLAG(AcctLRU, ACCT_LRU) | |
76 | TESTCLEARPCGFLAG(AcctLRU, ACCT_LRU) | |
77 | ||
78 | ||
79 | SETPCGFLAG(FileMapped, FILE_MAPPED) | |
80 | CLEARPCGFLAG(FileMapped, FILE_MAPPED) | |
81 | TESTPCGFLAG(FileMapped, FILE_MAPPED) | |
82 | ||
83 | SETPCGFLAG(Migration, MIGRATION) | |
84 | CLEARPCGFLAG(Migration, MIGRATION) | |
85 | TESTPCGFLAG(Migration, MIGRATION) | |
86 | ||
87 | static inline int page_cgroup_nid(struct page_cgroup *pc) | |
88 | { | |
89 | return page_to_nid(pc->page); | |
90 | } | |
91 | ||
92 | static inline enum zone_type page_cgroup_zid(struct page_cgroup *pc) | |
93 | { | |
94 | return page_zonenum(pc->page); | |
95 | } | |
96 | ||
97 | static inline void lock_page_cgroup(struct page_cgroup *pc) | |
98 | { | |
99 | bit_spin_lock(PCG_LOCK, &pc->flags); | |
100 | } | |
101 | ||
102 | static inline void unlock_page_cgroup(struct page_cgroup *pc) | |
103 | { | |
104 | bit_spin_unlock(PCG_LOCK, &pc->flags); | |
105 | } | |
106 | ||
107 | #else /* CONFIG_CGROUP_MEM_RES_CTLR */ | |
108 | struct page_cgroup; | |
109 | ||
110 | static inline void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat) | |
111 | { | |
112 | } | |
113 | ||
114 | static inline struct page_cgroup *lookup_page_cgroup(struct page *page) | |
115 | { | |
116 | return NULL; | |
117 | } | |
118 | ||
119 | static inline void page_cgroup_init(void) | |
120 | { | |
121 | } | |
122 | ||
123 | static inline void __init page_cgroup_init_flatmem(void) | |
124 | { | |
125 | } | |
126 | ||
127 | #endif | |
128 | ||
129 | #include <linux/swap.h> | |
130 | ||
131 | #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP | |
132 | extern unsigned short swap_cgroup_cmpxchg(swp_entry_t ent, | |
133 | unsigned short old, unsigned short new); | |
134 | extern unsigned short swap_cgroup_record(swp_entry_t ent, unsigned short id); | |
135 | extern unsigned short lookup_swap_cgroup(swp_entry_t ent); | |
136 | extern int swap_cgroup_swapon(int type, unsigned long max_pages); | |
137 | extern void swap_cgroup_swapoff(int type); | |
138 | #else | |
139 | ||
140 | static inline | |
141 | unsigned short swap_cgroup_record(swp_entry_t ent, unsigned short id) | |
142 | { | |
143 | return 0; | |
144 | } | |
145 | ||
146 | static inline | |
147 | unsigned short lookup_swap_cgroup(swp_entry_t ent) | |
148 | { | |
149 | return 0; | |
150 | } | |
151 | ||
152 | static inline int | |
153 | swap_cgroup_swapon(int type, unsigned long max_pages) | |
154 | { | |
155 | return 0; | |
156 | } | |
157 | ||
158 | static inline void swap_cgroup_swapoff(int type) | |
159 | { | |
160 | return; | |
161 | } | |
162 | ||
163 | #endif | |
164 | #endif |