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 add_page_to_lru_list(struct page *page, 26 struct lruvec *lruvec, enum lru_list lru) 27 { 28 int nr_pages = hpage_nr_pages(page); 29 mem_cgroup_update_lru_size(lruvec, lru, nr_pages); 30 list_add(&page->lru, &lruvec->lists[lru]); 31 __mod_zone_page_state(lruvec_zone(lruvec), NR_LRU_BASE + lru, nr_pages); 32 } 33 34 static __always_inline void del_page_from_lru_list(struct page *page, 35 struct lruvec *lruvec, enum lru_list lru) 36 { 37 int nr_pages = hpage_nr_pages(page); 38 mem_cgroup_update_lru_size(lruvec, lru, -nr_pages); 39 list_del(&page->lru); 40 __mod_zone_page_state(lruvec_zone(lruvec), NR_LRU_BASE + lru, -nr_pages); 41 } 42 43 /** 44 * page_lru_base_type - which LRU list type should a page be on? 45 * @page: the page to test 46 * 47 * Used for LRU list index arithmetic. 48 * 49 * Returns the base LRU type - file or anon - @page should be on. 50 */ 51 static inline enum lru_list page_lru_base_type(struct page *page) 52 { 53 if (page_is_file_cache(page)) 54 return LRU_INACTIVE_FILE; 55 return LRU_INACTIVE_ANON; 56 } 57 58 /** 59 * page_off_lru - which LRU list was page on? clearing its lru flags. 60 * @page: the page to test 61 * 62 * Returns the LRU list a page was on, as an index into the array of LRU 63 * lists; and clears its Unevictable or Active flags, ready for freeing. 64 */ 65 static __always_inline enum lru_list page_off_lru(struct page *page) 66 { 67 enum lru_list lru; 68 69 if (PageUnevictable(page)) { 70 __ClearPageUnevictable(page); 71 lru = LRU_UNEVICTABLE; 72 } else { 73 lru = page_lru_base_type(page); 74 if (PageActive(page)) { 75 __ClearPageActive(page); 76 lru += LRU_ACTIVE; 77 } 78 } 79 return lru; 80 } 81 82 /** 83 * page_lru - which LRU list should a page be on? 84 * @page: the page to test 85 * 86 * Returns the LRU list a page should be on, as an index 87 * into the array of LRU lists. 88 */ 89 static __always_inline enum lru_list page_lru(struct page *page) 90 { 91 enum lru_list lru; 92 93 if (PageUnevictable(page)) 94 lru = LRU_UNEVICTABLE; 95 else { 96 lru = page_lru_base_type(page); 97 if (PageActive(page)) 98 lru += LRU_ACTIVE; 99 } 100 return lru; 101 } 102 103 #define lru_to_page(head) (list_entry((head)->prev, struct page, lru)) 104 105 #endif 106