101 lines
2.4 KiB
C
101 lines
2.4 KiB
C
#ifndef LINUX_MM_INLINE_H
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#define LINUX_MM_INLINE_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 LRU_FILE 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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if (PageSwapBacked(page))
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return 0;
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/* The page is page cache backed by a normal filesystem. */
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return LRU_FILE;
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}
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static inline void
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add_page_to_lru_list(struct zone *zone, struct page *page, enum lru_list l)
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{
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list_add(&page->lru, &zone->lru[l].list);
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__inc_zone_state(zone, NR_LRU_BASE + l);
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}
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static inline void
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del_page_from_lru_list(struct zone *zone, struct page *page, enum lru_list l)
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{
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list_del(&page->lru);
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__dec_zone_state(zone, NR_LRU_BASE + l);
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}
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static inline void
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del_page_from_lru(struct zone *zone, struct page *page)
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{
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enum lru_list l = LRU_BASE;
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list_del(&page->lru);
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if (PageUnevictable(page)) {
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__ClearPageUnevictable(page);
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l = LRU_UNEVICTABLE;
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} else {
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if (PageActive(page)) {
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__ClearPageActive(page);
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l += LRU_ACTIVE;
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}
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l += page_is_file_cache(page);
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}
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__dec_zone_state(zone, NR_LRU_BASE + l);
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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 inline enum lru_list page_lru(struct page *page)
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{
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enum lru_list lru = LRU_BASE;
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if (PageUnevictable(page))
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lru = LRU_UNEVICTABLE;
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else {
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if (PageActive(page))
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lru += LRU_ACTIVE;
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lru += page_is_file_cache(page);
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}
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return lru;
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}
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/**
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* inactive_anon_is_low - check if anonymous pages need to be deactivated
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* @zone: zone to check
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*
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* Returns true if the zone does not have enough inactive anon pages,
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* meaning some active anon pages need to be deactivated.
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*/
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static inline int inactive_anon_is_low(struct zone *zone)
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{
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unsigned long active, inactive;
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active = zone_page_state(zone, NR_ACTIVE_ANON);
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inactive = zone_page_state(zone, NR_INACTIVE_ANON);
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if (inactive * zone->inactive_ratio < active)
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return 1;
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return 0;
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}
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#endif
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