diff options
author | Russell King <rmk@dyn-67.arm.linux.org.uk> | 2008-10-22 19:34:09 +0100 |
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committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2008-10-22 19:34:09 +0100 |
commit | f20e3b5fe7ead0615309433260b9784d8da0bbbd (patch) | |
tree | eabb2e47a0355ac4e8024b7087b4e7cb9f324358 /include/linux/mm_inline.h | |
parent | bcbfe664e7af019e698cef2feb85ac2b4f1ac11d (diff) | |
parent | f030d7b65e4e6399f23de2a41a58d1b607b6bd89 (diff) |
Merge branch 'for-rmk' of git://git.android.com/kernel into devel
Diffstat (limited to 'include/linux/mm_inline.h')
-rw-r--r-- | include/linux/mm_inline.h | 98 |
1 files changed, 79 insertions, 19 deletions
diff --git a/include/linux/mm_inline.h b/include/linux/mm_inline.h index 895bc4e9303..c948350c378 100644 --- a/include/linux/mm_inline.h +++ b/include/linux/mm_inline.h @@ -1,40 +1,100 @@ -static inline void -add_page_to_active_list(struct zone *zone, struct page *page) -{ - list_add(&page->lru, &zone->active_list); - __inc_zone_state(zone, NR_ACTIVE); -} +#ifndef LINUX_MM_INLINE_H +#define LINUX_MM_INLINE_H -static inline void -add_page_to_inactive_list(struct zone *zone, struct page *page) +/** + * page_is_file_cache - should the page be on a file LRU or anon LRU? + * @page: the page to test + * + * Returns LRU_FILE if @page is page cache page backed by a regular filesystem, + * or 0 if @page is anonymous, tmpfs or otherwise ram or swap backed. + * 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_cache(struct page *page) { - list_add(&page->lru, &zone->inactive_list); - __inc_zone_state(zone, NR_INACTIVE); + if (PageSwapBacked(page)) + return 0; + + /* The page is page cache backed by a normal filesystem. */ + return LRU_FILE; } static inline void -del_page_from_active_list(struct zone *zone, struct page *page) +add_page_to_lru_list(struct zone *zone, struct page *page, enum lru_list l) { - list_del(&page->lru); - __dec_zone_state(zone, NR_ACTIVE); + list_add(&page->lru, &zone->lru[l].list); + __inc_zone_state(zone, NR_LRU_BASE + l); } static inline void -del_page_from_inactive_list(struct zone *zone, struct page *page) +del_page_from_lru_list(struct zone *zone, struct page *page, enum lru_list l) { list_del(&page->lru); - __dec_zone_state(zone, NR_INACTIVE); + __dec_zone_state(zone, NR_LRU_BASE + l); } static inline void del_page_from_lru(struct zone *zone, struct page *page) { + enum lru_list l = LRU_BASE; + list_del(&page->lru); - if (PageActive(page)) { - __ClearPageActive(page); - __dec_zone_state(zone, NR_ACTIVE); + if (PageUnevictable(page)) { + __ClearPageUnevictable(page); + l = LRU_UNEVICTABLE; } else { - __dec_zone_state(zone, NR_INACTIVE); + if (PageActive(page)) { + __ClearPageActive(page); + l += LRU_ACTIVE; + } + l += page_is_file_cache(page); + } + __dec_zone_state(zone, NR_LRU_BASE + l); +} + +/** + * 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 inline enum lru_list page_lru(struct page *page) +{ + enum lru_list lru = LRU_BASE; + + if (PageUnevictable(page)) + lru = LRU_UNEVICTABLE; + else { + if (PageActive(page)) + lru += LRU_ACTIVE; + lru += page_is_file_cache(page); } + + return lru; } +/** + * inactive_anon_is_low - check if anonymous pages need to be deactivated + * @zone: zone to check + * + * Returns true if the zone does not have enough inactive anon pages, + * meaning some active anon pages need to be deactivated. + */ +static inline int inactive_anon_is_low(struct zone *zone) +{ + unsigned long active, inactive; + + active = zone_page_state(zone, NR_ACTIVE_ANON); + inactive = zone_page_state(zone, NR_INACTIVE_ANON); + + if (inactive * zone->inactive_ratio < active) + return 1; + + return 0; +} +#endif |