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1 | #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 | |
11 | static inline bool page_is_young(struct page *page) | |
12 | { | |
13 | return PageYoung(page); | |
14 | } | |
15 | ||
16 | static inline void set_page_young(struct page *page) | |
17 | { | |
18 | SetPageYoung(page); | |
19 | } | |
20 | ||
21 | static inline bool test_and_clear_page_young(struct page *page) | |
22 | { | |
23 | return TestClearPageYoung(page); | |
24 | } | |
25 | ||
26 | static inline bool page_is_idle(struct page *page) | |
27 | { | |
28 | return PageIdle(page); | |
29 | } | |
30 | ||
31 | static inline void set_page_idle(struct page *page) | |
32 | { | |
33 | SetPageIdle(page); | |
34 | } | |
35 | ||
36 | static 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 | */ | |
45 | extern struct page_ext_operations page_idle_ops; | |
46 | ||
47 | static inline bool page_is_young(struct page *page) | |
48 | { | |
49 | return test_bit(PAGE_EXT_YOUNG, &lookup_page_ext(page)->flags); | |
50 | } | |
51 | ||
52 | static inline void set_page_young(struct page *page) | |
53 | { | |
54 | set_bit(PAGE_EXT_YOUNG, &lookup_page_ext(page)->flags); | |
55 | } | |
56 | ||
57 | static 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 | ||
63 | static inline bool page_is_idle(struct page *page) | |
64 | { | |
65 | return test_bit(PAGE_EXT_IDLE, &lookup_page_ext(page)->flags); | |
66 | } | |
67 | ||
68 | static inline void set_page_idle(struct page *page) | |
69 | { | |
70 | set_bit(PAGE_EXT_IDLE, &lookup_page_ext(page)->flags); | |
71 | } | |
72 | ||
73 | static 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 | ||
81 | static inline bool page_is_young(struct page *page) | |
82 | { | |
83 | return false; | |
84 | } | |
85 | ||
86 | static inline void set_page_young(struct page *page) | |
87 | { | |
88 | } | |
89 | ||
90 | static inline bool test_and_clear_page_young(struct page *page) | |
91 | { | |
92 | return false; | |
93 | } | |
94 | ||
95 | static inline bool page_is_idle(struct page *page) | |
96 | { | |
97 | return false; | |
98 | } | |
99 | ||
100 | static inline void set_page_idle(struct page *page) | |
101 | { | |
102 | } | |
103 | ||
104 | static 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 */ |