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 lru)
  26 {
  27         struct lruvec *lruvec;
  28
  29         lruvec = mem_cgroup_lru_add_list(zone, page, lru);
  30         list_add(&page->lru, &lruvec->lists[lru]);
  31         __mod_zone_page_state(zone, NR_LRU_BASE + lru, hpage_nr_pages(page));
  32 }
  33
  34 static inline void
  35 del_page_from_lru_list(struct zone *zone, struct page *page, enum lru_list lru)
  36 {
  37         mem_cgroup_lru_del_list(page, lru);
  38         list_del(&page->lru);
  39         __mod_zone_page_state(zone, NR_LRU_BASE + lru, -hpage_nr_pages(page));
  40 }
  41
  42 /**
  43  * page_lru_base_type - which LRU list type should a page be on?
  44  * @page: the page to test
  45  *
  46  * Used for LRU list index arithmetic.
  47  *
  48  * Returns the base LRU type - file or anon - @page should be on.
  49  */
  50 static inline enum lru_list page_lru_base_type(struct page *page)
  51 {
  52         if (page_is_file_cache(page))
  53                 return LRU_INACTIVE_FILE;
  54         return LRU_INACTIVE_ANON;
  55 }
  56
  57 /**
  58  * page_off_lru - which LRU list was page on? clearing its lru flags.
  59  * @page: the page to test
  60  *
  61  * Returns the LRU list a page was on, as an index into the array of LRU
  62  * lists; and clears its Unevictable or Active flags, ready for freeing.
  63  */
  64 static inline enum lru_list page_off_lru(struct page *page)
  65 {
  66         enum lru_list lru;
  67
  68         if (PageUnevictable(page)) {
  69                 __ClearPageUnevictable(page);
  70                 lru = LRU_UNEVICTABLE;
  71         } else {
  72                 lru = page_lru_base_type(page);
  73                 if (PageActive(page)) {
  74                         __ClearPageActive(page);
  75                         lru += LRU_ACTIVE;
  76                 }
  77         }
  78         return lru;
  79 }
  80
  81 /**
  82  * page_lru - which LRU list should a page be on?
  83  * @page: the page to test
  84  *
  85  * Returns the LRU list a page should be on, as an index
  86  * into the array of LRU lists.
  87  */
  88 static inline enum lru_list page_lru(struct page *page)
  89 {
  90         enum lru_list lru;
  91
  92         if (PageUnevictable(page))
  93                 lru = LRU_UNEVICTABLE;
  94         else {
  95                 lru = page_lru_base_type(page);
  96                 if (PageActive(page))
  97                         lru += LRU_ACTIVE;
  98         }
  99         return lru;
 100 }
 101
 102 #endif