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