1 #ifndef _LINUX_MM_PAGE_IDLE_H
2 #define _LINUX_MM_PAGE_IDLE_H
4 #include <linux/bitops.h>
5 #include <linux/page-flags.h>
6 #include <linux/page_ext.h>
8 #ifdef CONFIG_IDLE_PAGE_TRACKING
11 static inline bool page_is_young(struct page *page)
13 return PageYoung(page);
16 static inline void set_page_young(struct page *page)
21 static inline bool test_and_clear_page_young(struct page *page)
23 return TestClearPageYoung(page);
26 static inline bool page_is_idle(struct page *page)
28 return PageIdle(page);
31 static inline void set_page_idle(struct page *page)
36 static inline void clear_page_idle(struct page *page)
40 #else /* !CONFIG_64BIT */
42 * If there is not enough space to store Idle and Young bits in page flags, use
43 * page ext flags instead.
45 extern struct page_ext_operations page_idle_ops;
47 static inline bool page_is_young(struct page *page)
49 struct page_ext *page_ext = lookup_page_ext(page);
51 if (unlikely(!page_ext))
54 return test_bit(PAGE_EXT_YOUNG, &page_ext->flags);
57 static inline void set_page_young(struct page *page)
59 struct page_ext *page_ext = lookup_page_ext(page);
61 if (unlikely(!page_ext))
64 set_bit(PAGE_EXT_YOUNG, &page_ext->flags);
67 static inline bool test_and_clear_page_young(struct page *page)
69 struct page_ext *page_ext = lookup_page_ext(page);
71 if (unlikely(!page_ext))
74 return test_and_clear_bit(PAGE_EXT_YOUNG, &page_ext->flags);
77 static inline bool page_is_idle(struct page *page)
79 struct page_ext *page_ext = lookup_page_ext(page);
81 if (unlikely(!page_ext))
84 return test_bit(PAGE_EXT_IDLE, &page_ext->flags);
87 static inline void set_page_idle(struct page *page)
89 struct page_ext *page_ext = lookup_page_ext(page);
91 if (unlikely(!page_ext))
94 set_bit(PAGE_EXT_IDLE, &page_ext->flags);
97 static inline void clear_page_idle(struct page *page)
99 struct page_ext *page_ext = lookup_page_ext(page);
101 if (unlikely(!page_ext))
104 clear_bit(PAGE_EXT_IDLE, &page_ext->flags);
106 #endif /* CONFIG_64BIT */
108 #else /* !CONFIG_IDLE_PAGE_TRACKING */
110 static inline bool page_is_young(struct page *page)
115 static inline void set_page_young(struct page *page)
119 static inline bool test_and_clear_page_young(struct page *page)
124 static inline bool page_is_idle(struct page *page)
129 static inline void set_page_idle(struct page *page)
133 static inline void clear_page_idle(struct page *page)
137 #endif /* CONFIG_IDLE_PAGE_TRACKING */
139 #endif /* _LINUX_MM_PAGE_IDLE_H */