| #ifndef LINUX_MM_INLINE_H |
| #define LINUX_MM_INLINE_H |
| |
| /** |
| * 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) |
| { |
| if (PageSwapBacked(page)) |
| return 0; |
| |
| /* The page is page cache backed by a normal filesystem. */ |
| return LRU_FILE; |
| } |
| |
| static inline void |
| add_page_to_lru_list(struct zone *zone, struct page *page, enum lru_list l) |
| { |
| list_add(&page->lru, &zone->lru[l].list); |
| __inc_zone_state(zone, NR_LRU_BASE + l); |
| mem_cgroup_add_lru_list(page, l); |
| } |
| |
| static inline void |
| del_page_from_lru_list(struct zone *zone, struct page *page, enum lru_list l) |
| { |
| list_del(&page->lru); |
| __dec_zone_state(zone, NR_LRU_BASE + l); |
| mem_cgroup_del_lru_list(page, l); |
| } |
| |
| /** |
| * page_lru_base_type - which LRU list type should a page be on? |
| * @page: the page to test |
| * |
| * Used for LRU list index arithmetic. |
| * |
| * Returns the base LRU type - file or anon - @page should be on. |
| */ |
| static inline enum lru_list page_lru_base_type(struct page *page) |
| { |
| if (page_is_file_cache(page)) |
| return LRU_INACTIVE_FILE; |
| return LRU_INACTIVE_ANON; |
| } |
| |
| static inline void |
| del_page_from_lru(struct zone *zone, struct page *page) |
| { |
| enum lru_list l; |
| |
| list_del(&page->lru); |
| if (PageUnevictable(page)) { |
| __ClearPageUnevictable(page); |
| l = LRU_UNEVICTABLE; |
| } else { |
| l = page_lru_base_type(page); |
| if (PageActive(page)) { |
| __ClearPageActive(page); |
| l += LRU_ACTIVE; |
| } |
| } |
| __dec_zone_state(zone, NR_LRU_BASE + l); |
| mem_cgroup_del_lru_list(page, 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; |
| |
| if (PageUnevictable(page)) |
| lru = LRU_UNEVICTABLE; |
| else { |
| lru = page_lru_base_type(page); |
| if (PageActive(page)) |
| lru += LRU_ACTIVE; |
| } |
| |
| return lru; |
| } |
| |
| #endif |