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33c3fc71 VD |
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 | { | |
f86e4271 YS |
49 | struct page_ext *page_ext = lookup_page_ext(page); |
50 | ||
51 | if (unlikely(!page_ext)) | |
52 | return false; | |
53 | ||
54 | return test_bit(PAGE_EXT_YOUNG, &page_ext->flags); | |
33c3fc71 VD |
55 | } |
56 | ||
57 | static inline void set_page_young(struct page *page) | |
58 | { | |
f86e4271 YS |
59 | struct page_ext *page_ext = lookup_page_ext(page); |
60 | ||
61 | if (unlikely(!page_ext)) | |
62 | return; | |
63 | ||
64 | set_bit(PAGE_EXT_YOUNG, &page_ext->flags); | |
33c3fc71 VD |
65 | } |
66 | ||
67 | static inline bool test_and_clear_page_young(struct page *page) | |
68 | { | |
f86e4271 YS |
69 | struct page_ext *page_ext = lookup_page_ext(page); |
70 | ||
71 | if (unlikely(!page_ext)) | |
72 | return false; | |
73 | ||
74 | return test_and_clear_bit(PAGE_EXT_YOUNG, &page_ext->flags); | |
33c3fc71 VD |
75 | } |
76 | ||
77 | static inline bool page_is_idle(struct page *page) | |
78 | { | |
f86e4271 YS |
79 | struct page_ext *page_ext = lookup_page_ext(page); |
80 | ||
81 | if (unlikely(!page_ext)) | |
82 | return false; | |
83 | ||
84 | return test_bit(PAGE_EXT_IDLE, &page_ext->flags); | |
33c3fc71 VD |
85 | } |
86 | ||
87 | static inline void set_page_idle(struct page *page) | |
88 | { | |
f86e4271 YS |
89 | struct page_ext *page_ext = lookup_page_ext(page); |
90 | ||
91 | if (unlikely(!page_ext)) | |
92 | return; | |
93 | ||
94 | set_bit(PAGE_EXT_IDLE, &page_ext->flags); | |
33c3fc71 VD |
95 | } |
96 | ||
97 | static inline void clear_page_idle(struct page *page) | |
98 | { | |
f86e4271 YS |
99 | struct page_ext *page_ext = lookup_page_ext(page); |
100 | ||
101 | if (unlikely(!page_ext)) | |
102 | return; | |
103 | ||
104 | clear_bit(PAGE_EXT_IDLE, &page_ext->flags); | |
33c3fc71 VD |
105 | } |
106 | #endif /* CONFIG_64BIT */ | |
107 | ||
108 | #else /* !CONFIG_IDLE_PAGE_TRACKING */ | |
109 | ||
110 | static inline bool page_is_young(struct page *page) | |
111 | { | |
112 | return false; | |
113 | } | |
114 | ||
115 | static inline void set_page_young(struct page *page) | |
116 | { | |
117 | } | |
118 | ||
119 | static inline bool test_and_clear_page_young(struct page *page) | |
120 | { | |
121 | return false; | |
122 | } | |
123 | ||
124 | static inline bool page_is_idle(struct page *page) | |
125 | { | |
126 | return false; | |
127 | } | |
128 | ||
129 | static inline void set_page_idle(struct page *page) | |
130 | { | |
131 | } | |
132 | ||
133 | static inline void clear_page_idle(struct page *page) | |
134 | { | |
135 | } | |
136 | ||
137 | #endif /* CONFIG_IDLE_PAGE_TRACKING */ | |
138 | ||
139 | #endif /* _LINUX_MM_PAGE_IDLE_H */ |