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