LXR linux/include/linux/mm

   1#ifndef LINUX_MM_INLINE_H
   2#define LINUX_MM_INLINE_H
   3
   4#include <linux/huge_mm.h>
   5
   6/**
   7 * page_is_file_cache - should the page be on a file LRU or anon LRU?
   8 * @page: the page to test
   9 *
  10 * Returns 1 if @page is page cache page backed by a regular filesystem,
  11 * or 0 if @page is anonymous, tmpfs or otherwise ram or swap backed.
  12 * Used by functions that manipulate the LRU lists, to sort a page
  13 * onto the right LRU list.
  14 *
  15 * We would like to get this info without a page flag, but the state
  16 * needs to survive until the page is last deleted from the LRU, which
  17 * could be as far down as __page_cache_release.
  18 */
  19static inline int page_is_file_cache(struct page *page)
  20{
  21        return !PageSwapBacked(page);
  22}
  23
  24static inline void
  25__add_page_to_lru_list(struct zone *zone, struct page *page, enum lru_list l,
  26                       struct list_head *head)
  27{
  28        list_add(&page->lru, head);
  29        __mod_zone_page_state(zone, NR_LRU_BASE + l, hpage_nr_pages(page));
  30        mem_cgroup_add_lru_list(page, l);
  31}
  32
  33static inline void
  34add_page_to_lru_list(struct zone *zone, struct page *page, enum lru_list l)
  35{
  36        __add_page_to_lru_list(zone, page, l, &zone->lru[l].list);
  37}
  38
  39static inline void
  40del_page_from_lru_list(struct zone *zone, struct page *page, enum lru_list l)
  41{
  42        list_del(&page->lru);
  43        __mod_zone_page_state(zone, NR_LRU_BASE + l, -hpage_nr_pages(page));
  44        mem_cgroup_del_lru_list(page, l);
  45}
  46
  47/**
  48 * page_lru_base_type - which LRU list type should a page be on?
  49 * @page: the page to test
  50 *
  51 * Used for LRU list index arithmetic.
  52 *
  53 * Returns the base LRU type - file or anon - @page should be on.
  54 */
  55static inline enum lru_list page_lru_base_type(struct page *page)
  56{
  57        if (page_is_file_cache(page))
  58                return LRU_INACTIVE_FILE;
  59        return LRU_INACTIVE_ANON;
  60}
  61
  62static inline void
  63del_page_from_lru(struct zone *zone, struct page *page)
  64{
  65        enum lru_list l;
  66
  67        list_del(&page->lru);
  68        if (PageUnevictable(page)) {
  69                __ClearPageUnevictable(page);
  70                l = LRU_UNEVICTABLE;
  71        } else {
  72                l = page_lru_base_type(page);
  73                if (PageActive(page)) {
  74                        __ClearPageActive(page);
  75                        l += LRU_ACTIVE;
  76                }
  77        }
  78        __mod_zone_page_state(zone, NR_LRU_BASE + l, -hpage_nr_pages(page));
  79        mem_cgroup_del_lru_list(page, l);
  80}
  81
  82/**
  83 * page_lru - which LRU list should a page be on?
  84 * @page: the page to test
  85 *
  86 * Returns the LRU list a page should be on, as an index
  87 * into the array of LRU lists.
  88 */
  89static inline enum lru_list page_lru(struct page *page)
  90{
  91        enum lru_list lru;
  92
  93        if (PageUnevictable(page))
  94                lru = LRU_UNEVICTABLE;
  95        else {
  96                lru = page_lru_base_type(page);
  97                if (PageActive(page))
  98                        lru += LRU_ACTIVE;
  99        }
 100
 101        return lru;
 102}
 103
 104#endif
 105