| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef LINUX_MM_INLINE_H |
| #define LINUX_MM_INLINE_H |
| |
| #include <linux/huge_mm.h> |
| #include <linux/swap.h> |
| |
| /** |
| * page_is_file_lru - should the page be on a file LRU or anon LRU? |
| * @page: the page to test |
| * |
| * Returns 1 if @page is a regular filesystem backed page cache page or a lazily |
| * freed anonymous page (e.g. via MADV_FREE). Returns 0 if @page is a normal |
| * anonymous page, a tmpfs page or otherwise ram or swap backed page. Used by |
| * functions that manipulate the LRU lists, to sort a page onto the right LRU |
| * list. |
| * |
| * We would like to get this info without a page flag, but the state |
| * needs to survive until the page is last deleted from the LRU, which |
| * could be as far down as __page_cache_release. |
| */ |
| static inline int page_is_file_lru(struct page *page) |
| { |
| return !PageSwapBacked(page); |
| } |
| |
| static __always_inline void update_lru_size(struct lruvec *lruvec, |
| enum lru_list lru, enum zone_type zid, |
| int nr_pages) |
| { |
| struct pglist_data *pgdat = lruvec_pgdat(lruvec); |
| |
| __mod_lruvec_state(lruvec, NR_LRU_BASE + lru, nr_pages); |
| __mod_zone_page_state(&pgdat->node_zones[zid], |
| NR_ZONE_LRU_BASE + lru, nr_pages); |
| #ifdef CONFIG_MEMCG |
| mem_cgroup_update_lru_size(lruvec, lru, zid, nr_pages); |
| #endif |
| } |
| |
| /** |
| * __clear_page_lru_flags - clear page lru flags before releasing a page |
| * @page: the page that was on lru and now has a zero reference |
| */ |
| static __always_inline void __clear_page_lru_flags(struct page *page) |
| { |
| VM_BUG_ON_PAGE(!PageLRU(page), page); |
| |
| __ClearPageLRU(page); |
| |
| /* this shouldn't happen, so leave the flags to bad_page() */ |
| if (PageActive(page) && PageUnevictable(page)) |
| return; |
| |
| __ClearPageActive(page); |
| __ClearPageUnevictable(page); |
| } |
| |
| /** |
| * page_lru - which LRU list should a page be on? |
| * @page: the page to test |
| * |
| * Returns the LRU list a page should be on, as an index |
| * into the array of LRU lists. |
| */ |
| static __always_inline enum lru_list page_lru(struct page *page) |
| { |
| enum lru_list lru; |
| |
| VM_BUG_ON_PAGE(PageActive(page) && PageUnevictable(page), page); |
| |
| if (PageUnevictable(page)) |
| return LRU_UNEVICTABLE; |
| |
| lru = page_is_file_lru(page) ? LRU_INACTIVE_FILE : LRU_INACTIVE_ANON; |
| if (PageActive(page)) |
| lru += LRU_ACTIVE; |
| |
| return lru; |
| } |
| |
| static __always_inline void add_page_to_lru_list(struct page *page, |
| struct lruvec *lruvec) |
| { |
| enum lru_list lru = page_lru(page); |
| |
| update_lru_size(lruvec, lru, page_zonenum(page), thp_nr_pages(page)); |
| list_add(&page->lru, &lruvec->lists[lru]); |
| } |
| |
| static __always_inline void add_page_to_lru_list_tail(struct page *page, |
| struct lruvec *lruvec) |
| { |
| enum lru_list lru = page_lru(page); |
| |
| update_lru_size(lruvec, lru, page_zonenum(page), thp_nr_pages(page)); |
| list_add_tail(&page->lru, &lruvec->lists[lru]); |
| } |
| |
| static __always_inline void del_page_from_lru_list(struct page *page, |
| struct lruvec *lruvec) |
| { |
| list_del(&page->lru); |
| update_lru_size(lruvec, page_lru(page), page_zonenum(page), |
| -thp_nr_pages(page)); |
| } |
| #endif |