diff options
Diffstat (limited to 'include/linux/mm_inline.h')
-rw-r--r-- | include/linux/mm_inline.h | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/include/linux/mm_inline.h b/include/linux/mm_inline.h new file mode 100644 index 000000000..8fc71e9d7 --- /dev/null +++ b/include/linux/mm_inline.h @@ -0,0 +1,128 @@ +/* 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); +} + +static __always_inline void update_lru_size(struct lruvec *lruvec, + enum lru_list lru, enum zone_type zid, + int nr_pages) +{ + __update_lru_size(lruvec, lru, zid, nr_pages); +#ifdef CONFIG_MEMCG + mem_cgroup_update_lru_size(lruvec, lru, zid, nr_pages); +#endif +} + +static __always_inline void add_page_to_lru_list(struct page *page, + struct lruvec *lruvec, enum lru_list lru) +{ + 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) +{ + 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, enum lru_list lru) +{ + list_del(&page->lru); + update_lru_size(lruvec, lru, page_zonenum(page), -thp_nr_pages(page)); +} + +/** + * page_lru_base_type - which LRU list type should a page be on? + * @page: the page to test + * + * Used for LRU list index arithmetic. + * + * Returns the base LRU type - file or anon - @page should be on. + */ +static inline enum lru_list page_lru_base_type(struct page *page) +{ + if (page_is_file_lru(page)) + return LRU_INACTIVE_FILE; + return LRU_INACTIVE_ANON; +} + +/** + * page_off_lru - which LRU list was page on? clearing its lru flags. + * @page: the page to test + * + * Returns the LRU list a page was on, as an index into the array of LRU + * lists; and clears its Unevictable or Active flags, ready for freeing. + */ +static __always_inline enum lru_list page_off_lru(struct page *page) +{ + enum lru_list lru; + + if (PageUnevictable(page)) { + __ClearPageUnevictable(page); + lru = LRU_UNEVICTABLE; + } else { + lru = page_lru_base_type(page); + if (PageActive(page)) { + __ClearPageActive(page); + lru += LRU_ACTIVE; + } + } + return lru; +} + +/** + * 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; + + if (PageUnevictable(page)) + lru = LRU_UNEVICTABLE; + else { + lru = page_lru_base_type(page); + if (PageActive(page)) + lru += LRU_ACTIVE; + } + return lru; +} +#endif |