Linux kernel mirror (for testing)
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linux
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 */
13struct 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
20void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat);
21void __init page_cgroup_init(void);
22struct page_cgroup *lookup_page_cgroup(struct page *page);
23
24enum {
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) \
36static inline int PageCgroup##uname(struct page_cgroup *pc) \
37 { return test_bit(PCG_##lname, &pc->flags); }
38
39#define SETPCGFLAG(uname, lname) \
40static inline void SetPageCgroup##uname(struct page_cgroup *pc)\
41 { set_bit(PCG_##lname, &pc->flags); }
42
43#define CLEARPCGFLAG(uname, lname) \
44static 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) */
48TESTPCGFLAG(Cache, CACHE)
49
50TESTPCGFLAG(Used, USED)
51CLEARPCGFLAG(Used, USED)
52
53/* LRU management flags (from global-lru definition) */
54TESTPCGFLAG(File, FILE)
55SETPCGFLAG(File, FILE)
56CLEARPCGFLAG(File, FILE)
57
58TESTPCGFLAG(Active, ACTIVE)
59SETPCGFLAG(Active, ACTIVE)
60CLEARPCGFLAG(Active, ACTIVE)
61
62TESTPCGFLAG(Unevictable, UNEVICTABLE)
63SETPCGFLAG(Unevictable, UNEVICTABLE)
64CLEARPCGFLAG(Unevictable, UNEVICTABLE)
65
66static inline int page_cgroup_nid(struct page_cgroup *pc)
67{
68 return page_to_nid(pc->page);
69}
70
71static inline enum zone_type page_cgroup_zid(struct page_cgroup *pc)
72{
73 return page_zonenum(pc->page);
74}
75
76static inline void lock_page_cgroup(struct page_cgroup *pc)
77{
78 bit_spin_lock(PCG_LOCK, &pc->flags);
79}
80
81static inline int trylock_page_cgroup(struct page_cgroup *pc)
82{
83 return bit_spin_trylock(PCG_LOCK, &pc->flags);
84}
85
86static 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 */
92struct page_cgroup;
93
94static inline void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat)
95{
96}
97
98static inline struct page_cgroup *lookup_page_cgroup(struct page *page)
99{
100 return NULL;
101}
102
103static inline void page_cgroup_init(void)
104{
105}
106
107#endif
108#endif