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_lru - should the page be on a file LRU or anon LRU? 10 * @page: the page to test 11 * 12 * Returns 1 if @page is a regular filesystem backed page cache page or a lazily 13 * freed anonymous page (e.g. via MADV_FREE). Returns 0 if @page is a normal 14 * anonymous page, a tmpfs page or otherwise ram or swap backed page. Used by 15 * functions that manipulate the LRU lists, to sort a page onto the right LRU 16 * list. 17 * 18 * We would like to get this info without a page flag, but the state 19 * needs to survive until the page is last deleted from the LRU, which 20 * could be as far down as __page_cache_release. 21 */ 22 static inline int page_is_file_lru(struct page *page) 23 { 24 return !PageSwapBacked(page); 25 } 26 27 static __always_inline void update_lru_size(struct lruvec *lruvec, 28 enum lru_list lru, enum zone_type zid, 29 int nr_pages) 30 { 31 struct pglist_data *pgdat = lruvec_pgdat(lruvec); 32 33 __mod_lruvec_state(lruvec, NR_LRU_BASE + lru, nr_pages); 34 __mod_zone_page_state(&pgdat->node_zones[zid], 35 NR_ZONE_LRU_BASE + lru, nr_pages); 36 #ifdef CONFIG_MEMCG 37 mem_cgroup_update_lru_size(lruvec, lru, zid, nr_pages); 38 #endif 39 } 40 41 /** 42 * __clear_page_lru_flags - clear page lru flags before releasing a page 43 * @page: the page that was on lru and now has a zero reference 44 */ 45 static __always_inline void __clear_page_lru_flags(struct page *page) 46 { 47 VM_BUG_ON_PAGE(!PageLRU(page), page); 48 49 __ClearPageLRU(page); 50 51 /* this shouldn't happen, so leave the flags to bad_page() */ 52 if (PageActive(page) && PageUnevictable(page)) 53 return; 54 55 __ClearPageActive(page); 56 __ClearPageUnevictable(page); 57 } 58 59 /** 60 * page_lru - which LRU list should a page be on? 61 * @page: the page to test 62 * 63 * Returns the LRU list a page should be on, as an index 64 * into the array of LRU lists. 65 */ 66 static __always_inline enum lru_list page_lru(struct page *page) 67 { 68 enum lru_list lru; 69 70 VM_BUG_ON_PAGE(PageActive(page) && PageUnevictable(page), page); 71 72 if (PageUnevictable(page)) 73 return LRU_UNEVICTABLE; 74 75 lru = page_is_file_lru(page) ? LRU_INACTIVE_FILE : LRU_INACTIVE_ANON; 76 if (PageActive(page)) 77 lru += LRU_ACTIVE; 78 79 return lru; 80 } 81 82 static __always_inline void add_page_to_lru_list(struct page *page, 83 struct lruvec *lruvec) 84 { 85 enum lru_list lru = page_lru(page); 86 87 update_lru_size(lruvec, lru, page_zonenum(page), thp_nr_pages(page)); 88 list_add(&page->lru, &lruvec->lists[lru]); 89 } 90 91 static __always_inline void add_page_to_lru_list_tail(struct page *page, 92 struct lruvec *lruvec) 93 { 94 enum lru_list lru = page_lru(page); 95 96 update_lru_size(lruvec, lru, page_zonenum(page), thp_nr_pages(page)); 97 list_add_tail(&page->lru, &lruvec->lists[lru]); 98 } 99 100 static __always_inline void del_page_from_lru_list(struct page *page, 101 struct lruvec *lruvec) 102 { 103 list_del(&page->lru); 104 update_lru_size(lruvec, page_lru(page), page_zonenum(page), 105 -thp_nr_pages(page)); 106 } 107 #endif 108