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 #include <linux/swap.h>
   6
   7 /**
   8  * page_is_file_cache - should the page be on a file LRU or anon LRU?
   9  * @page: the page to test
  10  *
  11  * Returns 1 if @page is page cache page backed by a regular filesystem,
  12  * or 0 if @page is anonymous, tmpfs or otherwise ram or swap backed.
  13  * Used by functions that manipulate the LRU lists, to sort a page
  14  * onto the right LRU list.
  15  *
  16  * We would like to get this info without a page flag, but the state
  17  * needs to survive until the page is last deleted from the LRU, which
  18  * could be as far down as __page_cache_release.
  19  */
  20 static inline int page_is_file_cache(struct page *page)
  21 {
  22         return !PageSwapBacked(page);
  23 }
  24
  25 static __always_inline void __update_lru_size(struct lruvec *lruvec,
  26                                 enum lru_list lru, enum zone_type zid,
  27                                 int nr_pages)
  28 {
  29         struct pglist_data *pgdat = lruvec_pgdat(lruvec);
  30
  31         __mod_node_page_state(pgdat, NR_LRU_BASE + lru, nr_pages);
  32         __mod_zone_page_state(&pgdat->node_zones[zid],
  33                                 NR_ZONE_LRU_BASE + lru, nr_pages);
  34 }
  35
  36 static __always_inline void update_lru_size(struct lruvec *lruvec,
  37                                 enum lru_list lru, enum zone_type zid,
  38                                 int nr_pages)
  39 {
  40         __update_lru_size(lruvec, lru, zid, nr_pages);
  41 #ifdef CONFIG_MEMCG
  42         mem_cgroup_update_lru_size(lruvec, lru, nr_pages);
  43 #endif
  44 }
  45
  46 static __always_inline void add_page_to_lru_list(struct page *page,
  47                                 struct lruvec *lruvec, enum lru_list lru)
  48 {
  49         update_lru_size(lruvec, lru, page_zonenum(page), hpage_nr_pages(page));
  50         list_add(&page->lru, &lruvec->lists[lru]);
  51 }
  52
  53 static __always_inline void del_page_from_lru_list(struct page *page,
  54                                 struct lruvec *lruvec, enum lru_list lru)
  55 {
  56         list_del(&page->lru);
  57         update_lru_size(lruvec, lru, page_zonenum(page), -hpage_nr_pages(page));
  58 }
  59
  60 /**
  61  * page_lru_base_type - which LRU list type should a page be on?
  62  * @page: the page to test
  63  *
  64  * Used for LRU list index arithmetic.
  65  *
  66  * Returns the base LRU type - file or anon - @page should be on.
  67  */
  68 static inline enum lru_list page_lru_base_type(struct page *page)
  69 {
  70         if (page_is_file_cache(page))
  71                 return LRU_INACTIVE_FILE;
  72         return LRU_INACTIVE_ANON;
  73 }
  74
  75 /**
  76  * page_off_lru - which LRU list was page on? clearing its lru flags.
  77  * @page: the page to test
  78  *
  79  * Returns the LRU list a page was on, as an index into the array of LRU
  80  * lists; and clears its Unevictable or Active flags, ready for freeing.
  81  */
  82 static __always_inline enum lru_list page_off_lru(struct page *page)
  83 {
  84         enum lru_list lru;
  85
  86         if (PageUnevictable(page)) {
  87                 __ClearPageUnevictable(page);
  88                 lru = LRU_UNEVICTABLE;
  89         } else {
  90                 lru = page_lru_base_type(page);
  91                 if (PageActive(page)) {
  92                         __ClearPageActive(page);
  93                         lru += LRU_ACTIVE;
  94                 }
  95         }
  96         return lru;
  97 }
  98
  99 /**
 100  * page_lru - which LRU list should a page be on?
 101  * @page: the page to test
 102  *
 103  * Returns the LRU list a page should be on, as an index
 104  * into the array of LRU lists.
 105  */
 106 static __always_inline enum lru_list page_lru(struct page *page)
 107 {
 108         enum lru_list lru;
 109
 110         if (PageUnevictable(page))
 111                 lru = LRU_UNEVICTABLE;
 112         else {
 113                 lru = page_lru_base_type(page);
 114                 if (PageActive(page))
 115                         lru += LRU_ACTIVE;
 116         }
 117         return lru;
 118 }
 119
 120 #define lru_to_page(head) (list_entry((head)->prev, struct page, lru))
 121
 122 #endif