| 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_PAGE_IDLE_FLAG |
| 10 | |
| 11 | #ifndef CONFIG_64BIT |
| 12 | /* |
| 13 | * If there is not enough space to store Idle and Young bits in page flags, use |
| 14 | * page ext flags instead. |
| 15 | */ |
| 16 | static inline bool folio_test_young(struct folio *folio) |
| 17 | { |
| 18 | struct page_ext *page_ext = page_ext_get(&folio->page); |
| 19 | bool page_young; |
| 20 | |
| 21 | if (unlikely(!page_ext)) |
| 22 | return false; |
| 23 | |
| 24 | page_young = test_bit(PAGE_EXT_YOUNG, &page_ext->flags); |
| 25 | page_ext_put(page_ext); |
| 26 | |
| 27 | return page_young; |
| 28 | } |
| 29 | |
| 30 | static inline void folio_set_young(struct folio *folio) |
| 31 | { |
| 32 | struct page_ext *page_ext = page_ext_get(&folio->page); |
| 33 | |
| 34 | if (unlikely(!page_ext)) |
| 35 | return; |
| 36 | |
| 37 | set_bit(PAGE_EXT_YOUNG, &page_ext->flags); |
| 38 | page_ext_put(page_ext); |
| 39 | } |
| 40 | |
| 41 | static inline bool folio_test_clear_young(struct folio *folio) |
| 42 | { |
| 43 | struct page_ext *page_ext = page_ext_get(&folio->page); |
| 44 | bool page_young; |
| 45 | |
| 46 | if (unlikely(!page_ext)) |
| 47 | return false; |
| 48 | |
| 49 | page_young = test_and_clear_bit(PAGE_EXT_YOUNG, &page_ext->flags); |
| 50 | page_ext_put(page_ext); |
| 51 | |
| 52 | return page_young; |
| 53 | } |
| 54 | |
| 55 | static inline bool folio_test_idle(struct folio *folio) |
| 56 | { |
| 57 | struct page_ext *page_ext = page_ext_get(&folio->page); |
| 58 | bool page_idle; |
| 59 | |
| 60 | if (unlikely(!page_ext)) |
| 61 | return false; |
| 62 | |
| 63 | page_idle = test_bit(PAGE_EXT_IDLE, &page_ext->flags); |
| 64 | page_ext_put(page_ext); |
| 65 | |
| 66 | return page_idle; |
| 67 | } |
| 68 | |
| 69 | static inline void folio_set_idle(struct folio *folio) |
| 70 | { |
| 71 | struct page_ext *page_ext = page_ext_get(&folio->page); |
| 72 | |
| 73 | if (unlikely(!page_ext)) |
| 74 | return; |
| 75 | |
| 76 | set_bit(PAGE_EXT_IDLE, &page_ext->flags); |
| 77 | page_ext_put(page_ext); |
| 78 | } |
| 79 | |
| 80 | static inline void folio_clear_idle(struct folio *folio) |
| 81 | { |
| 82 | struct page_ext *page_ext = page_ext_get(&folio->page); |
| 83 | |
| 84 | if (unlikely(!page_ext)) |
| 85 | return; |
| 86 | |
| 87 | clear_bit(PAGE_EXT_IDLE, &page_ext->flags); |
| 88 | page_ext_put(page_ext); |
| 89 | } |
| 90 | #endif /* !CONFIG_64BIT */ |
| 91 | |
| 92 | #else /* !CONFIG_PAGE_IDLE_FLAG */ |
| 93 | |
| 94 | static inline bool folio_test_young(struct folio *folio) |
| 95 | { |
| 96 | return false; |
| 97 | } |
| 98 | |
| 99 | static inline void folio_set_young(struct folio *folio) |
| 100 | { |
| 101 | } |
| 102 | |
| 103 | static inline bool folio_test_clear_young(struct folio *folio) |
| 104 | { |
| 105 | return false; |
| 106 | } |
| 107 | |
| 108 | static inline bool folio_test_idle(struct folio *folio) |
| 109 | { |
| 110 | return false; |
| 111 | } |
| 112 | |
| 113 | static inline void folio_set_idle(struct folio *folio) |
| 114 | { |
| 115 | } |
| 116 | |
| 117 | static inline void folio_clear_idle(struct folio *folio) |
| 118 | { |
| 119 | } |
| 120 | |
| 121 | #endif /* CONFIG_PAGE_IDLE_FLAG */ |
| 122 | |
| 123 | static inline bool page_is_young(struct page *page) |
| 124 | { |
| 125 | return folio_test_young(page_folio(page)); |
| 126 | } |
| 127 | |
| 128 | static inline void set_page_young(struct page *page) |
| 129 | { |
| 130 | folio_set_young(page_folio(page)); |
| 131 | } |
| 132 | |
| 133 | static inline bool test_and_clear_page_young(struct page *page) |
| 134 | { |
| 135 | return folio_test_clear_young(page_folio(page)); |
| 136 | } |
| 137 | |
| 138 | static inline bool page_is_idle(struct page *page) |
| 139 | { |
| 140 | return folio_test_idle(page_folio(page)); |
| 141 | } |
| 142 | |
| 143 | static inline void set_page_idle(struct page *page) |
| 144 | { |
| 145 | folio_set_idle(page_folio(page)); |
| 146 | } |
| 147 | |
| 148 | static inline void clear_page_idle(struct page *page) |
| 149 | { |
| 150 | folio_clear_idle(page_folio(page)); |
| 151 | } |
| 152 | #endif /* _LINUX_MM_PAGE_IDLE_H */ |