108 lines
2.9 KiB
C
108 lines
2.9 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#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_lru - 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 a regular filesystem backed page cache page or a lazily
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* freed anonymous page (e.g. via MADV_FREE). Returns 0 if @page is a normal
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* anonymous page, a tmpfs page or otherwise ram or swap backed page. Used by
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* functions that manipulate the LRU lists, to sort a page onto the right LRU
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* 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_lru(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_lruvec_state(lruvec, 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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#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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/**
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* __clear_page_lru_flags - clear page lru flags before releasing a page
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* @page: the page that was on lru and now has a zero reference
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*/
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static __always_inline void __clear_page_lru_flags(struct page *page)
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{
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VM_BUG_ON_PAGE(!PageLRU(page), page);
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__ClearPageLRU(page);
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/* this shouldn't happen, so leave the flags to bad_page() */
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if (PageActive(page) && PageUnevictable(page))
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return;
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__ClearPageActive(page);
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__ClearPageUnevictable(page);
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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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VM_BUG_ON_PAGE(PageActive(page) && PageUnevictable(page), page);
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if (PageUnevictable(page))
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return LRU_UNEVICTABLE;
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lru = page_is_file_lru(page) ? LRU_INACTIVE_FILE : LRU_INACTIVE_ANON;
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if (PageActive(page))
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lru += LRU_ACTIVE;
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return lru;
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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)
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{
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enum lru_list lru = page_lru(page);
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update_lru_size(lruvec, lru, page_zonenum(page), thp_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 add_page_to_lru_list_tail(struct page *page,
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struct lruvec *lruvec)
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{
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enum lru_list lru = page_lru(page);
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update_lru_size(lruvec, lru, page_zonenum(page), thp_nr_pages(page));
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list_add_tail(&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)
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{
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list_del(&page->lru);
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update_lru_size(lruvec, page_lru(page), page_zonenum(page),
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-thp_nr_pages(page));
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}
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#endif
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