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122 lines
3.2 KiB
122 lines
3.2 KiB
#ifndef LINUX_MM_INLINE_H |
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#define LINUX_MM_INLINE_H |
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#include <linux/huge_mm.h> |
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#include <linux/swap.h> |
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/** |
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* page_is_file_cache - should the page be on a file LRU or anon LRU? |
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* @page: the page to test |
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* |
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* Returns 1 if @page is page cache page backed by a regular filesystem, |
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* or 0 if @page is anonymous, tmpfs or otherwise ram or swap backed. |
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* Used by functions that manipulate the LRU lists, to sort a page |
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* onto the right LRU list. |
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* |
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* We would like to get this info without a page flag, but the state |
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* needs to survive until the page is last deleted from the LRU, which |
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* could be as far down as __page_cache_release. |
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*/ |
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static inline int page_is_file_cache(struct page *page) |
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{ |
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return !PageSwapBacked(page); |
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} |
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static __always_inline void __update_lru_size(struct lruvec *lruvec, |
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enum lru_list lru, enum zone_type zid, |
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int nr_pages) |
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{ |
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struct pglist_data *pgdat = lruvec_pgdat(lruvec); |
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__mod_node_page_state(pgdat, NR_LRU_BASE + lru, nr_pages); |
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__mod_zone_page_state(&pgdat->node_zones[zid], |
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NR_ZONE_LRU_BASE + lru, nr_pages); |
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} |
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static __always_inline void update_lru_size(struct lruvec *lruvec, |
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enum lru_list lru, enum zone_type zid, |
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int nr_pages) |
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{ |
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__update_lru_size(lruvec, lru, zid, nr_pages); |
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#ifdef CONFIG_MEMCG |
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mem_cgroup_update_lru_size(lruvec, lru, zid, nr_pages); |
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#endif |
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} |
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static __always_inline void add_page_to_lru_list(struct page *page, |
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struct lruvec *lruvec, enum lru_list lru) |
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{ |
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update_lru_size(lruvec, lru, page_zonenum(page), hpage_nr_pages(page)); |
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list_add(&page->lru, &lruvec->lists[lru]); |
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} |
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static __always_inline void del_page_from_lru_list(struct page *page, |
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struct lruvec *lruvec, enum lru_list lru) |
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{ |
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list_del(&page->lru); |
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update_lru_size(lruvec, lru, page_zonenum(page), -hpage_nr_pages(page)); |
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} |
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/** |
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* page_lru_base_type - which LRU list type should a page be on? |
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* @page: the page to test |
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* |
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* Used for LRU list index arithmetic. |
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* |
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* Returns the base LRU type - file or anon - @page should be on. |
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*/ |
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static inline enum lru_list page_lru_base_type(struct page *page) |
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{ |
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if (page_is_file_cache(page)) |
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return LRU_INACTIVE_FILE; |
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return LRU_INACTIVE_ANON; |
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} |
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/** |
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* page_off_lru - which LRU list was page on? clearing its lru flags. |
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* @page: the page to test |
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* |
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* Returns the LRU list a page was on, as an index into the array of LRU |
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* lists; and clears its Unevictable or Active flags, ready for freeing. |
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*/ |
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static __always_inline enum lru_list page_off_lru(struct page *page) |
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{ |
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enum lru_list lru; |
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if (PageUnevictable(page)) { |
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__ClearPageUnevictable(page); |
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lru = LRU_UNEVICTABLE; |
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} else { |
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lru = page_lru_base_type(page); |
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if (PageActive(page)) { |
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__ClearPageActive(page); |
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lru += LRU_ACTIVE; |
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} |
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} |
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return lru; |
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} |
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/** |
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* page_lru - which LRU list should a page be on? |
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* @page: the page to test |
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* |
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* Returns the LRU list a page should be on, as an index |
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* into the array of LRU lists. |
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*/ |
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static __always_inline enum lru_list page_lru(struct page *page) |
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{ |
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enum lru_list lru; |
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if (PageUnevictable(page)) |
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lru = LRU_UNEVICTABLE; |
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else { |
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lru = page_lru_base_type(page); |
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if (PageActive(page)) |
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lru += LRU_ACTIVE; |
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} |
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return lru; |
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} |
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#define lru_to_page(head) (list_entry((head)->prev, struct page, lru)) |
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#endif
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