1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef LINUX_MM_INLINE_H 3 #define LINUX_MM_INLINE_H 4 5 #include <linux/huge_mm.h> 6 #include <linux/swap.h> 7 8 /** 9 * page_is_file_cache - should the page be on a file LRU or anon LRU? 10 * @page: the page to test 11 * 12 * Returns 1 if @page is page cache page backed by a regular filesystem, 13 * or 0 if @page is anonymous, tmpfs or otherwise ram or swap backed. 14 * Used by functions that manipulate the LRU lists, to sort a page 15 * onto the right LRU list. 16 * 17 * We would like to get this info without a page flag, but the state 18 * needs to survive until the page is last deleted from the LRU, which 19 * could be as far down as __page_cache_release. 20 */ 21 static inline int page_is_file_cache(struct page *page) 22 { 23 return !PageSwapBacked(page); 24 } 25 26 static __always_inline void __update_lru_size(struct lruvec *lruvec, 27 enum lru_list lru, enum zone_type zid, 28 int nr_pages) 29 { 30 struct pglist_data *pgdat = lruvec_pgdat(lruvec); 31 32 __mod_node_page_state(pgdat, NR_LRU_BASE + lru, nr_pages); 33 __mod_zone_page_state(&pgdat->node_zones[zid], 34 NR_ZONE_LRU_BASE + lru, nr_pages); 35 } 36 37 static __always_inline void update_lru_size(struct lruvec *lruvec, 38 enum lru_list lru, enum zone_type zid, 39 int nr_pages) 40 { 41 __update_lru_size(lruvec, lru, zid, nr_pages); 42 #ifdef CONFIG_MEMCG 43 mem_cgroup_update_lru_size(lruvec, lru, zid, nr_pages); 44 #endif 45 } 46 47 static __always_inline void add_page_to_lru_list(struct page *page, 48 struct lruvec *lruvec, enum lru_list lru) 49 { 50 update_lru_size(lruvec, lru, page_zonenum(page), hpage_nr_pages(page)); 51 list_add(&page->lru, &lruvec->lists[lru]); 52 } 53 54 static __always_inline void add_page_to_lru_list_tail(struct page *page, 55 struct lruvec *lruvec, enum lru_list lru) 56 { 57 update_lru_size(lruvec, lru, page_zonenum(page), hpage_nr_pages(page)); 58 list_add_tail(&page->lru, &lruvec->lists[lru]); 59 } 60 61 static __always_inline void del_page_from_lru_list(struct page *page, 62 struct lruvec *lruvec, enum lru_list lru) 63 { 64 list_del(&page->lru); 65 update_lru_size(lruvec, lru, page_zonenum(page), -hpage_nr_pages(page)); 66 } 67 68 /** 69 * page_lru_base_type - which LRU list type should a page be on? 70 * @page: the page to test 71 * 72 * Used for LRU list index arithmetic. 73 * 74 * Returns the base LRU type - file or anon - @page should be on. 75 */ 76 static inline enum lru_list page_lru_base_type(struct page *page) 77 { 78 if (page_is_file_cache(page)) 79 return LRU_INACTIVE_FILE; 80 return LRU_INACTIVE_ANON; 81 } 82 83 /** 84 * page_off_lru - which LRU list was page on? clearing its lru flags. 85 * @page: the page to test 86 * 87 * Returns the LRU list a page was on, as an index into the array of LRU 88 * lists; and clears its Unevictable or Active flags, ready for freeing. 89 */ 90 static __always_inline enum lru_list page_off_lru(struct page *page) 91 { 92 enum lru_list lru; 93 94 if (PageUnevictable(page)) { 95 __ClearPageUnevictable(page); 96 lru = LRU_UNEVICTABLE; 97 } else { 98 lru = page_lru_base_type(page); 99 if (PageActive(page)) { 100 __ClearPageActive(page); 101 lru += LRU_ACTIVE; 102 } 103 } 104 return lru; 105 } 106 107 /** 108 * page_lru - which LRU list should a page be on? 109 * @page: the page to test 110 * 111 * Returns the LRU list a page should be on, as an index 112 * into the array of LRU lists. 113 */ 114 static __always_inline enum lru_list page_lru(struct page *page) 115 { 116 enum lru_list lru; 117 118 if (PageUnevictable(page)) 119 lru = LRU_UNEVICTABLE; 120 else { 121 lru = page_lru_base_type(page); 122 if (PageActive(page)) 123 lru += LRU_ACTIVE; 124 } 125 return lru; 126 } 127 128 #define lru_to_page(head) (list_entry((head)->prev, struct page, lru)) 129 130 #endif 131