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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, /* Lock for pc->mem_cgroup and following bits. */
39 PCG_CACHE, /* charged as cache */
40 PCG_USED, /* this object is in use. */
41 PCG_MIGRATION, /* under page migration */
42 /* flags for mem_cgroup and file and I/O status */
43 PCG_MOVE_LOCK, /* For race between move_account v.s. following bits */
44 PCG_FILE_MAPPED, /* page is accounted as "mapped" */
45 /* No lock in page_cgroup */
46 PCG_ACCT_LRU, /* page has been accounted for (under lru_lock) */
47};
48
49#define TESTPCGFLAG(uname, lname) \
50static inline int PageCgroup##uname(struct page_cgroup *pc) \
51 { return test_bit(PCG_##lname, &pc->flags); }
52
53#define SETPCGFLAG(uname, lname) \
54static inline void SetPageCgroup##uname(struct page_cgroup *pc)\
55 { set_bit(PCG_##lname, &pc->flags); }
56
57#define CLEARPCGFLAG(uname, lname) \
58static inline void ClearPageCgroup##uname(struct page_cgroup *pc) \
59 { clear_bit(PCG_##lname, &pc->flags); }
60
61#define TESTCLEARPCGFLAG(uname, lname) \
62static inline int TestClearPageCgroup##uname(struct page_cgroup *pc) \
63 { return test_and_clear_bit(PCG_##lname, &pc->flags); }
64
65/* Cache flag is set only once (at allocation) */
66TESTPCGFLAG(Cache, CACHE)
67CLEARPCGFLAG(Cache, CACHE)
68SETPCGFLAG(Cache, CACHE)
69
70TESTPCGFLAG(Used, USED)
71CLEARPCGFLAG(Used, USED)
72SETPCGFLAG(Used, USED)
73
74SETPCGFLAG(AcctLRU, ACCT_LRU)
75CLEARPCGFLAG(AcctLRU, ACCT_LRU)
76TESTPCGFLAG(AcctLRU, ACCT_LRU)
77TESTCLEARPCGFLAG(AcctLRU, ACCT_LRU)
78
79
80SETPCGFLAG(FileMapped, FILE_MAPPED)
81CLEARPCGFLAG(FileMapped, FILE_MAPPED)
82TESTPCGFLAG(FileMapped, FILE_MAPPED)
83
84SETPCGFLAG(Migration, MIGRATION)
85CLEARPCGFLAG(Migration, MIGRATION)
86TESTPCGFLAG(Migration, MIGRATION)
87
88static inline int page_cgroup_nid(struct page_cgroup *pc)
89{
90 return page_to_nid(pc->page);
91}
92
93static inline enum zone_type page_cgroup_zid(struct page_cgroup *pc)
94{
95 return page_zonenum(pc->page);
96}
97
98static inline void lock_page_cgroup(struct page_cgroup *pc)
99{
100 /*
101 * Don't take this lock in IRQ context.
102 * This lock is for pc->mem_cgroup, USED, CACHE, MIGRATION
103 */
104 bit_spin_lock(PCG_LOCK, &pc->flags);
105}
106
107static inline void unlock_page_cgroup(struct page_cgroup *pc)
108{
109 bit_spin_unlock(PCG_LOCK, &pc->flags);
110}
111
112static inline int page_is_cgroup_locked(struct page_cgroup *pc)
113{
114 return bit_spin_is_locked(PCG_LOCK, &pc->flags);
115}
116
117static inline void move_lock_page_cgroup(struct page_cgroup *pc,
118 unsigned long *flags)
119{
120 /*
121 * We know updates to pc->flags of page cache's stats are from both of
122 * usual context or IRQ context. Disable IRQ to avoid deadlock.
123 */
124 local_irq_save(*flags);
125 bit_spin_lock(PCG_MOVE_LOCK, &pc->flags);
126}
127
128static inline void move_unlock_page_cgroup(struct page_cgroup *pc,
129 unsigned long *flags)
130{
131 bit_spin_unlock(PCG_MOVE_LOCK, &pc->flags);
132 local_irq_restore(*flags);
133}
134
135#else /* CONFIG_CGROUP_MEM_RES_CTLR */
136struct page_cgroup;
137
138static inline void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat)
139{
140}
141
142static inline struct page_cgroup *lookup_page_cgroup(struct page *page)
143{
144 return NULL;
145}
146
147static inline void page_cgroup_init(void)
148{
149}
150
151static inline void __init page_cgroup_init_flatmem(void)
152{
153}
154
155#endif
156
157#include <linux/swap.h>
158
159#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
160extern unsigned short swap_cgroup_cmpxchg(swp_entry_t ent,
161 unsigned short old, unsigned short new);
162extern unsigned short swap_cgroup_record(swp_entry_t ent, unsigned short id);
163extern unsigned short lookup_swap_cgroup(swp_entry_t ent);
164extern int swap_cgroup_swapon(int type, unsigned long max_pages);
165extern void swap_cgroup_swapoff(int type);
166#else
167
168static inline
169unsigned short swap_cgroup_record(swp_entry_t ent, unsigned short id)
170{
171 return 0;
172}
173
174static inline
175unsigned short lookup_swap_cgroup(swp_entry_t ent)
176{
177 return 0;
178}
179
180static inline int
181swap_cgroup_swapon(int type, unsigned long max_pages)
182{
183 return 0;
184}
185
186static inline void swap_cgroup_swapoff(int type)
187{
188 return;
189}
190
191#endif
192#endif