139 строки
3.7 KiB
C
139 строки
3.7 KiB
C
/* 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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* folio_is_file_lru - Should the folio be on a file LRU or anon LRU?
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* @folio: The folio to test.
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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 folio 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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* Return: An integer (not a boolean!) used to sort a folio onto the
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* right LRU list and to account folios correctly.
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* 1 if @folio is a regular filesystem backed page cache folio
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* or a lazily freed anonymous folio (e.g. via MADV_FREE).
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* 0 if @folio is a normal anonymous folio, a tmpfs folio or otherwise
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* ram or swap backed folio.
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*/
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static inline int folio_is_file_lru(struct folio *folio)
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{
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return !folio_test_swapbacked(folio);
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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 folio_is_file_lru(page_folio(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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long 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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* __folio_clear_lru_flags - Clear page lru flags before releasing a page.
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* @folio: The folio that was on lru and now has a zero reference.
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*/
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static __always_inline void __folio_clear_lru_flags(struct folio *folio)
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{
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VM_BUG_ON_FOLIO(!folio_test_lru(folio), folio);
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__folio_clear_lru(folio);
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/* this shouldn't happen, so leave the flags to bad_page() */
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if (folio_test_active(folio) && folio_test_unevictable(folio))
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return;
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__folio_clear_active(folio);
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__folio_clear_unevictable(folio);
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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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__folio_clear_lru_flags(page_folio(page));
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}
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/**
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* folio_lru_list - Which LRU list should a folio be on?
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* @folio: The folio to test.
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*
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* Return: The LRU list a folio 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 folio_lru_list(struct folio *folio)
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{
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enum lru_list lru;
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VM_BUG_ON_FOLIO(folio_test_active(folio) && folio_test_unevictable(folio), folio);
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if (folio_test_unevictable(folio))
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return LRU_UNEVICTABLE;
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lru = folio_is_file_lru(folio) ? LRU_INACTIVE_FILE : LRU_INACTIVE_ANON;
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if (folio_test_active(folio))
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lru += LRU_ACTIVE;
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return lru;
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}
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static __always_inline
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void lruvec_add_folio(struct lruvec *lruvec, struct folio *folio)
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{
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enum lru_list lru = folio_lru_list(folio);
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update_lru_size(lruvec, lru, folio_zonenum(folio),
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folio_nr_pages(folio));
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list_add(&folio->lru, &lruvec->lists[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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lruvec_add_folio(lruvec, page_folio(page));
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}
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static __always_inline
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void lruvec_add_folio_tail(struct lruvec *lruvec, struct folio *folio)
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{
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enum lru_list lru = folio_lru_list(folio);
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update_lru_size(lruvec, lru, folio_zonenum(folio),
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folio_nr_pages(folio));
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list_add_tail(&folio->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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lruvec_add_folio_tail(lruvec, page_folio(page));
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}
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static __always_inline
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void lruvec_del_folio(struct lruvec *lruvec, struct folio *folio)
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{
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list_del(&folio->lru);
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update_lru_size(lruvec, folio_lru_list(folio), folio_zonenum(folio),
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-folio_nr_pages(folio));
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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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lruvec_del_folio(lruvec, page_folio(page));
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}
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#endif
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