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52d4b9ac KH |
1 | #ifndef __LINUX_PAGE_CGROUP_H |
2 | #define __LINUX_PAGE_CGROUP_H | |
3 | ||
6b3ae58e JW |
4 | enum { |
5 | /* flags for mem_cgroup */ | |
6 | PCG_LOCK, /* Lock for pc->mem_cgroup and following bits. */ | |
7 | PCG_CACHE, /* charged as cache */ | |
8 | PCG_USED, /* this object is in use. */ | |
9 | PCG_MIGRATION, /* under page migration */ | |
10 | /* flags for mem_cgroup and file and I/O status */ | |
11 | PCG_MOVE_LOCK, /* For race between move_account v.s. following bits */ | |
12 | PCG_FILE_MAPPED, /* page is accounted as "mapped" */ | |
13 | /* No lock in page_cgroup */ | |
14 | PCG_ACCT_LRU, /* page has been accounted for (under lru_lock) */ | |
15 | __NR_PCG_FLAGS, | |
16 | }; | |
17 | ||
18 | #ifndef __GENERATING_BOUNDS_H | |
19 | #include <generated/bounds.h> | |
20 | ||
52d4b9ac KH |
21 | #ifdef CONFIG_CGROUP_MEM_RES_CTLR |
22 | #include <linux/bit_spinlock.h> | |
6b3ae58e | 23 | |
52d4b9ac KH |
24 | /* |
25 | * Page Cgroup can be considered as an extended mem_map. | |
26 | * A page_cgroup page is associated with every page descriptor. The | |
27 | * page_cgroup helps us identify information about the cgroup | |
28 | * All page cgroups are allocated at boot or memory hotplug event, | |
29 | * then the page cgroup for pfn always exists. | |
30 | */ | |
31 | struct page_cgroup { | |
32 | unsigned long flags; | |
33 | struct mem_cgroup *mem_cgroup; | |
52d4b9ac KH |
34 | struct list_head lru; /* per cgroup LRU list */ |
35 | }; | |
36 | ||
31168481 | 37 | void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat); |
ca371c0d KH |
38 | |
39 | #ifdef CONFIG_SPARSEMEM | |
40 | static inline void __init page_cgroup_init_flatmem(void) | |
41 | { | |
42 | } | |
43 | extern void __init page_cgroup_init(void); | |
44 | #else | |
45 | void __init page_cgroup_init_flatmem(void); | |
46 | static inline void __init page_cgroup_init(void) | |
47 | { | |
48 | } | |
49 | #endif | |
50 | ||
52d4b9ac | 51 | struct page_cgroup *lookup_page_cgroup(struct page *page); |
6b3ae58e | 52 | struct page *lookup_cgroup_page(struct page_cgroup *pc); |
52d4b9ac KH |
53 | |
54 | #define TESTPCGFLAG(uname, lname) \ | |
55 | static inline int PageCgroup##uname(struct page_cgroup *pc) \ | |
56 | { return test_bit(PCG_##lname, &pc->flags); } | |
57 | ||
58 | #define SETPCGFLAG(uname, lname) \ | |
59 | static inline void SetPageCgroup##uname(struct page_cgroup *pc)\ | |
60 | { set_bit(PCG_##lname, &pc->flags); } | |
61 | ||
62 | #define CLEARPCGFLAG(uname, lname) \ | |
63 | static inline void ClearPageCgroup##uname(struct page_cgroup *pc) \ | |
64 | { clear_bit(PCG_##lname, &pc->flags); } | |
65 | ||
4b3bde4c BS |
66 | #define TESTCLEARPCGFLAG(uname, lname) \ |
67 | static inline int TestClearPageCgroup##uname(struct page_cgroup *pc) \ | |
68 | { return test_and_clear_bit(PCG_##lname, &pc->flags); } | |
69 | ||
52d4b9ac KH |
70 | /* Cache flag is set only once (at allocation) */ |
71 | TESTPCGFLAG(Cache, CACHE) | |
4b3bde4c BS |
72 | CLEARPCGFLAG(Cache, CACHE) |
73 | SETPCGFLAG(Cache, CACHE) | |
52d4b9ac KH |
74 | |
75 | TESTPCGFLAG(Used, USED) | |
76 | CLEARPCGFLAG(Used, USED) | |
4b3bde4c BS |
77 | SETPCGFLAG(Used, USED) |
78 | ||
79 | SETPCGFLAG(AcctLRU, ACCT_LRU) | |
80 | CLEARPCGFLAG(AcctLRU, ACCT_LRU) | |
81 | TESTPCGFLAG(AcctLRU, ACCT_LRU) | |
82 | TESTCLEARPCGFLAG(AcctLRU, ACCT_LRU) | |
52d4b9ac | 83 | |
8725d541 KH |
84 | |
85 | SETPCGFLAG(FileMapped, FILE_MAPPED) | |
86 | CLEARPCGFLAG(FileMapped, FILE_MAPPED) | |
87 | TESTPCGFLAG(FileMapped, FILE_MAPPED) | |
88 | ||
ac39cf8c | 89 | SETPCGFLAG(Migration, MIGRATION) |
90 | CLEARPCGFLAG(Migration, MIGRATION) | |
91 | TESTPCGFLAG(Migration, MIGRATION) | |
92 | ||
52d4b9ac KH |
93 | static inline void lock_page_cgroup(struct page_cgroup *pc) |
94 | { | |
dbd4ea78 KH |
95 | /* |
96 | * Don't take this lock in IRQ context. | |
97 | * This lock is for pc->mem_cgroup, USED, CACHE, MIGRATION | |
98 | */ | |
52d4b9ac KH |
99 | bit_spin_lock(PCG_LOCK, &pc->flags); |
100 | } | |
101 | ||
52d4b9ac KH |
102 | static inline void unlock_page_cgroup(struct page_cgroup *pc) |
103 | { | |
104 | bit_spin_unlock(PCG_LOCK, &pc->flags); | |
105 | } | |
106 | ||
dbd4ea78 KH |
107 | static inline void move_lock_page_cgroup(struct page_cgroup *pc, |
108 | unsigned long *flags) | |
109 | { | |
110 | /* | |
111 | * We know updates to pc->flags of page cache's stats are from both of | |
112 | * usual context or IRQ context. Disable IRQ to avoid deadlock. | |
113 | */ | |
114 | local_irq_save(*flags); | |
115 | bit_spin_lock(PCG_MOVE_LOCK, &pc->flags); | |
116 | } | |
117 | ||
118 | static inline void move_unlock_page_cgroup(struct page_cgroup *pc, | |
119 | unsigned long *flags) | |
120 | { | |
121 | bit_spin_unlock(PCG_MOVE_LOCK, &pc->flags); | |
122 | local_irq_restore(*flags); | |
123 | } | |
124 | ||
6b3ae58e JW |
125 | #ifdef CONFIG_SPARSEMEM |
126 | #define PCG_ARRAYID_WIDTH SECTIONS_SHIFT | |
127 | #else | |
128 | #define PCG_ARRAYID_WIDTH NODES_SHIFT | |
129 | #endif | |
130 | ||
131 | #if (PCG_ARRAYID_WIDTH > BITS_PER_LONG - NR_PCG_FLAGS) | |
132 | #error Not enough space left in pc->flags to store page_cgroup array IDs | |
133 | #endif | |
134 | ||
135 | /* pc->flags: ARRAY-ID | FLAGS */ | |
136 | ||
137 | #define PCG_ARRAYID_MASK ((1UL << PCG_ARRAYID_WIDTH) - 1) | |
138 | ||
139 | #define PCG_ARRAYID_OFFSET (BITS_PER_LONG - PCG_ARRAYID_WIDTH) | |
140 | /* | |
25985edc | 141 | * Zero the shift count for non-existent fields, to prevent compiler |
6b3ae58e JW |
142 | * warnings and ensure references are optimized away. |
143 | */ | |
144 | #define PCG_ARRAYID_SHIFT (PCG_ARRAYID_OFFSET * (PCG_ARRAYID_WIDTH != 0)) | |
145 | ||
146 | static inline void set_page_cgroup_array_id(struct page_cgroup *pc, | |
147 | unsigned long id) | |
148 | { | |
149 | pc->flags &= ~(PCG_ARRAYID_MASK << PCG_ARRAYID_SHIFT); | |
150 | pc->flags |= (id & PCG_ARRAYID_MASK) << PCG_ARRAYID_SHIFT; | |
151 | } | |
152 | ||
153 | static inline unsigned long page_cgroup_array_id(struct page_cgroup *pc) | |
154 | { | |
155 | return (pc->flags >> PCG_ARRAYID_SHIFT) & PCG_ARRAYID_MASK; | |
156 | } | |
157 | ||
52d4b9ac KH |
158 | #else /* CONFIG_CGROUP_MEM_RES_CTLR */ |
159 | struct page_cgroup; | |
160 | ||
31168481 | 161 | static inline void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat) |
52d4b9ac KH |
162 | { |
163 | } | |
164 | ||
165 | static inline struct page_cgroup *lookup_page_cgroup(struct page *page) | |
166 | { | |
167 | return NULL; | |
168 | } | |
94b6da5a KH |
169 | |
170 | static inline void page_cgroup_init(void) | |
171 | { | |
172 | } | |
173 | ||
ca371c0d KH |
174 | static inline void __init page_cgroup_init_flatmem(void) |
175 | { | |
176 | } | |
177 | ||
6b3ae58e | 178 | #endif /* CONFIG_CGROUP_MEM_RES_CTLR */ |
27a7faa0 | 179 | |
27a7faa0 | 180 | #include <linux/swap.h> |
97572751 JSR |
181 | |
182 | #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP | |
02491447 DN |
183 | extern unsigned short swap_cgroup_cmpxchg(swp_entry_t ent, |
184 | unsigned short old, unsigned short new); | |
a3b2d692 KH |
185 | extern unsigned short swap_cgroup_record(swp_entry_t ent, unsigned short id); |
186 | extern unsigned short lookup_swap_cgroup(swp_entry_t ent); | |
27a7faa0 KH |
187 | extern int swap_cgroup_swapon(int type, unsigned long max_pages); |
188 | extern void swap_cgroup_swapoff(int type); | |
189 | #else | |
27a7faa0 KH |
190 | |
191 | static inline | |
a3b2d692 | 192 | unsigned short swap_cgroup_record(swp_entry_t ent, unsigned short id) |
27a7faa0 | 193 | { |
a3b2d692 | 194 | return 0; |
27a7faa0 KH |
195 | } |
196 | ||
197 | static inline | |
a3b2d692 | 198 | unsigned short lookup_swap_cgroup(swp_entry_t ent) |
27a7faa0 | 199 | { |
a3b2d692 | 200 | return 0; |
27a7faa0 KH |
201 | } |
202 | ||
203 | static inline int | |
204 | swap_cgroup_swapon(int type, unsigned long max_pages) | |
205 | { | |
206 | return 0; | |
207 | } | |
208 | ||
209 | static inline void swap_cgroup_swapoff(int type) | |
210 | { | |
211 | return; | |
212 | } | |
213 | ||
6b3ae58e JW |
214 | #endif /* CONFIG_CGROUP_MEM_RES_CTLR_SWAP */ |
215 | ||
216 | #endif /* !__GENERATING_BOUNDS_H */ | |
217 | ||
218 | #endif /* __LINUX_PAGE_CGROUP_H */ |