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Vladimir Davydov33c3fc72015-09-09 15:35:45 -07001#ifndef _LINUX_MM_PAGE_IDLE_H
2#define _LINUX_MM_PAGE_IDLE_H
3
4#include <linux/bitops.h>
5#include <linux/page-flags.h>
6#include <linux/page_ext.h>
7
8#ifdef CONFIG_IDLE_PAGE_TRACKING
9
10#ifdef CONFIG_64BIT
11static inline bool page_is_young(struct page *page)
12{
13 return PageYoung(page);
14}
15
16static inline void set_page_young(struct page *page)
17{
18 SetPageYoung(page);
19}
20
21static inline bool test_and_clear_page_young(struct page *page)
22{
23 return TestClearPageYoung(page);
24}
25
26static inline bool page_is_idle(struct page *page)
27{
28 return PageIdle(page);
29}
30
31static inline void set_page_idle(struct page *page)
32{
33 SetPageIdle(page);
34}
35
36static inline void clear_page_idle(struct page *page)
37{
38 ClearPageIdle(page);
39}
40#else /* !CONFIG_64BIT */
41/*
42 * If there is not enough space to store Idle and Young bits in page flags, use
43 * page ext flags instead.
44 */
45extern struct page_ext_operations page_idle_ops;
46
47static inline bool page_is_young(struct page *page)
48{
49 return test_bit(PAGE_EXT_YOUNG, &lookup_page_ext(page)->flags);
50}
51
52static inline void set_page_young(struct page *page)
53{
54 set_bit(PAGE_EXT_YOUNG, &lookup_page_ext(page)->flags);
55}
56
57static inline bool test_and_clear_page_young(struct page *page)
58{
59 return test_and_clear_bit(PAGE_EXT_YOUNG,
60 &lookup_page_ext(page)->flags);
61}
62
63static inline bool page_is_idle(struct page *page)
64{
65 return test_bit(PAGE_EXT_IDLE, &lookup_page_ext(page)->flags);
66}
67
68static inline void set_page_idle(struct page *page)
69{
70 set_bit(PAGE_EXT_IDLE, &lookup_page_ext(page)->flags);
71}
72
73static inline void clear_page_idle(struct page *page)
74{
75 clear_bit(PAGE_EXT_IDLE, &lookup_page_ext(page)->flags);
76}
77#endif /* CONFIG_64BIT */
78
79#else /* !CONFIG_IDLE_PAGE_TRACKING */
80
81static inline bool page_is_young(struct page *page)
82{
83 return false;
84}
85
86static inline void set_page_young(struct page *page)
87{
88}
89
90static inline bool test_and_clear_page_young(struct page *page)
91{
92 return false;
93}
94
95static inline bool page_is_idle(struct page *page)
96{
97 return false;
98}
99
100static inline void set_page_idle(struct page *page)
101{
102}
103
104static inline void clear_page_idle(struct page *page)
105{
106}
107
108#endif /* CONFIG_IDLE_PAGE_TRACKING */
109
110#endif /* _LINUX_MM_PAGE_IDLE_H */