| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | #ifndef _LINUX_MM_PAGE_IDLE_H |
| 3 | #define _LINUX_MM_PAGE_IDLE_H |
| 4 | |
| 5 | #include <linux/bitops.h> |
| 6 | #include <linux/page-flags.h> |
| 7 | #include <linux/page_ext.h> |
| 8 | |
| 9 | #ifdef CONFIG_IDLE_PAGE_TRACKING |
| 10 | |
| 11 | #ifdef CONFIG_64BIT |
| 12 | static inline bool page_is_young(struct page *page) |
| 13 | { |
| 14 | return PageYoung(page); |
| 15 | } |
| 16 | |
| 17 | static inline void set_page_young(struct page *page) |
| 18 | { |
| 19 | SetPageYoung(page); |
| 20 | } |
| 21 | |
| 22 | static inline bool test_and_clear_page_young(struct page *page) |
| 23 | { |
| 24 | return TestClearPageYoung(page); |
| 25 | } |
| 26 | |
| 27 | static inline bool page_is_idle(struct page *page) |
| 28 | { |
| 29 | return PageIdle(page); |
| 30 | } |
| 31 | |
| 32 | static inline void set_page_idle(struct page *page) |
| 33 | { |
| 34 | SetPageIdle(page); |
| 35 | } |
| 36 | |
| 37 | static inline void clear_page_idle(struct page *page) |
| 38 | { |
| 39 | ClearPageIdle(page); |
| 40 | } |
| 41 | #else /* !CONFIG_64BIT */ |
| 42 | /* |
| 43 | * If there is not enough space to store Idle and Young bits in page flags, use |
| 44 | * page ext flags instead. |
| 45 | */ |
| 46 | extern struct page_ext_operations page_idle_ops; |
| 47 | |
| 48 | static inline bool page_is_young(struct page *page) |
| 49 | { |
| 50 | struct page_ext *page_ext = lookup_page_ext(page); |
| 51 | |
| 52 | if (unlikely(!page_ext)) |
| 53 | return false; |
| 54 | |
| 55 | return test_bit(PAGE_EXT_YOUNG, &page_ext->flags); |
| 56 | } |
| 57 | |
| 58 | static inline void set_page_young(struct page *page) |
| 59 | { |
| 60 | struct page_ext *page_ext = lookup_page_ext(page); |
| 61 | |
| 62 | if (unlikely(!page_ext)) |
| 63 | return; |
| 64 | |
| 65 | set_bit(PAGE_EXT_YOUNG, &page_ext->flags); |
| 66 | } |
| 67 | |
| 68 | static inline bool test_and_clear_page_young(struct page *page) |
| 69 | { |
| 70 | struct page_ext *page_ext = lookup_page_ext(page); |
| 71 | |
| 72 | if (unlikely(!page_ext)) |
| 73 | return false; |
| 74 | |
| 75 | return test_and_clear_bit(PAGE_EXT_YOUNG, &page_ext->flags); |
| 76 | } |
| 77 | |
| 78 | static inline bool page_is_idle(struct page *page) |
| 79 | { |
| 80 | struct page_ext *page_ext = lookup_page_ext(page); |
| 81 | |
| 82 | if (unlikely(!page_ext)) |
| 83 | return false; |
| 84 | |
| 85 | return test_bit(PAGE_EXT_IDLE, &page_ext->flags); |
| 86 | } |
| 87 | |
| 88 | static inline void set_page_idle(struct page *page) |
| 89 | { |
| 90 | struct page_ext *page_ext = lookup_page_ext(page); |
| 91 | |
| 92 | if (unlikely(!page_ext)) |
| 93 | return; |
| 94 | |
| 95 | set_bit(PAGE_EXT_IDLE, &page_ext->flags); |
| 96 | } |
| 97 | |
| 98 | static inline void clear_page_idle(struct page *page) |
| 99 | { |
| 100 | struct page_ext *page_ext = lookup_page_ext(page); |
| 101 | |
| 102 | if (unlikely(!page_ext)) |
| 103 | return; |
| 104 | |
| 105 | clear_bit(PAGE_EXT_IDLE, &page_ext->flags); |
| 106 | } |
| 107 | #endif /* CONFIG_64BIT */ |
| 108 | |
| 109 | #else /* !CONFIG_IDLE_PAGE_TRACKING */ |
| 110 | |
| 111 | static inline bool page_is_young(struct page *page) |
| 112 | { |
| 113 | return false; |
| 114 | } |
| 115 | |
| 116 | static inline void set_page_young(struct page *page) |
| 117 | { |
| 118 | } |
| 119 | |
| 120 | static inline bool test_and_clear_page_young(struct page *page) |
| 121 | { |
| 122 | return false; |
| 123 | } |
| 124 | |
| 125 | static inline bool page_is_idle(struct page *page) |
| 126 | { |
| 127 | return false; |
| 128 | } |
| 129 | |
| 130 | static inline void set_page_idle(struct page *page) |
| 131 | { |
| 132 | } |
| 133 | |
| 134 | static inline void clear_page_idle(struct page *page) |
| 135 | { |
| 136 | } |
| 137 | |
| 138 | #endif /* CONFIG_IDLE_PAGE_TRACKING */ |
| 139 | |
| 140 | #endif /* _LINUX_MM_PAGE_IDLE_H */ |