1 #ifndef LINUX_MM_INLINE_H 2 #define LINUX_MM_INLINE_H 3 4 #include <linux/huge_mm.h> 5 6 /** 7 * page_is_file_cache - should the page be on a file LRU or anon LRU? 8 * @page: the page to test 9 * 10 * Returns 1 if @page is page cache page backed by a regular filesystem, 11 * or 0 if @page is anonymous, tmpfs or otherwise ram or swap backed. 12 * Used by functions that manipulate the LRU lists, to sort a page 13 * onto the right LRU list. 14 * 15 * We would like to get this info without a page flag, but the state 16 * needs to survive until the page is last deleted from the LRU, which 17 * could be as far down as __page_cache_release. 18 */ 19 static inline int page_is_file_cache(struct page *page) 20 { 21 return !PageSwapBacked(page); 22 } 23 24 static inline void 25 __add_page_to_lru_list(struct zone *zone, struct page *page, enum lru_list l, 26 struct list_head *head) 27 { 28 list_add(&page->lru, head); 29 __mod_zone_page_state(zone, NR_LRU_BASE + l, hpage_nr_pages(page)); 30 mem_cgroup_add_lru_list(page, l); 31 } 32 33 static inline void 34 add_page_to_lru_list(struct zone *zone, struct page *page, enum lru_list l) 35 { 36 __add_page_to_lru_list(zone, page, l, &zone->lru[l].list); 37 } 38 39 static inline void 40 del_page_from_lru_list(struct zone *zone, struct page *page, enum lru_list l) 41 { 42 list_del(&page->lru); 43 __mod_zone_page_state(zone, NR_LRU_BASE + l, -hpage_nr_pages(page)); 44 mem_cgroup_del_lru_list(page, l); 45 } 46 47 /** 48 * page_lru_base_type - which LRU list type should a page be on? 49 * @page: the page to test 50 * 51 * Used for LRU list index arithmetic. 52 * 53 * Returns the base LRU type - file or anon - @page should be on. 54 */ 55 static inline enum lru_list page_lru_base_type(struct page *page) 56 { 57 if (page_is_file_cache(page)) 58 return LRU_INACTIVE_FILE; 59 return LRU_INACTIVE_ANON; 60 } 61 62 static inline void 63 del_page_from_lru(struct zone *zone, struct page *page) 64 { 65 enum lru_list l; 66 67 list_del(&page->lru); 68 if (PageUnevictable(page)) { 69 __ClearPageUnevictable(page); 70 l = LRU_UNEVICTABLE; 71 } else { 72 l = page_lru_base_type(page); 73 if (PageActive(page)) { 74 __ClearPageActive(page); 75 l += LRU_ACTIVE; 76 } 77 } 78 __mod_zone_page_state(zone, NR_LRU_BASE + l, -hpage_nr_pages(page)); 79 mem_cgroup_del_lru_list(page, l); 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 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 } 100 101 return lru; 102 } 103 104 #endif 105