include/linux/mm_inline.h

   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  */
  19 static inline int page_is_file_cache(struct page *page)
  20 {
  21         return !PageSwapBacked(page);
  22 }
  23
  24 static 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
  33 static inline void
  34 add_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
  39 static inline void
  40 del_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  */
  55 static 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
  62 static inline void
  63 del_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  */
  89 static 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