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, zid, 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 add_page_to_lru_list_tail(struct page *page,
  54                                 struct lruvec *lruvec, enum lru_list lru)
  55 {
  56         update_lru_size(lruvec, lru, page_zonenum(page), hpage_nr_pages(page));
  57         list_add_tail(&page->lru, &lruvec->lists[lru]);
  58 }
  59
  60 static __always_inline void del_page_from_lru_list(struct page *page,
  61                                 struct lruvec *lruvec, enum lru_list lru)
  62 {
  63         list_del(&page->lru);
  64         update_lru_size(lruvec, lru, page_zonenum(page), -hpage_nr_pages(page));
  65 }
  66
  67 /**
  68  * page_lru_base_type - which LRU list type should a page be on?
  69  * @page: the page to test
  70  *
  71  * Used for LRU list index arithmetic.
  72  *
  73  * Returns the base LRU type - file or anon - @page should be on.
  74  */
  75 static inline enum lru_list page_lru_base_type(struct page *page)
  76 {
  77         if (page_is_file_cache(page))
  78                 return LRU_INACTIVE_FILE;
  79         return LRU_INACTIVE_ANON;
  80 }
  81
  82 /**
  83  * page_off_lru - which LRU list was page on? clearing its lru flags.
  84  * @page: the page to test
  85  *
  86  * Returns the LRU list a page was on, as an index into the array of LRU
  87  * lists; and clears its Unevictable or Active flags, ready for freeing.
  88  */
  89 static __always_inline enum lru_list page_off_lru(struct page *page)
  90 {
  91         enum lru_list lru;
  92
  93         if (PageUnevictable(page)) {
  94                 __ClearPageUnevictable(page);
  95                 lru = LRU_UNEVICTABLE;
  96         } else {
  97                 lru = page_lru_base_type(page);
  98                 if (PageActive(page)) {
  99                         __ClearPageActive(page);
 100                         lru += LRU_ACTIVE;
 101                 }
 102         }
 103         return lru;
 104 }
 105
 106 /**
 107  * page_lru - which LRU list should a page be on?
 108  * @page: the page to test
 109  *
 110  * Returns the LRU list a page should be on, as an index
 111  * into the array of LRU lists.
 112  */
 113 static __always_inline enum lru_list page_lru(struct page *page)
 114 {
 115         enum lru_list lru;
 116
 117         if (PageUnevictable(page))
 118                 lru = LRU_UNEVICTABLE;
 119         else {
 120                 lru = page_lru_base_type(page);
 121                 if (PageActive(page))
 122                         lru += LRU_ACTIVE;
 123         }
 124         return lru;
 125 }
 126
 127 #define lru_to_page(head) (list_entry((head)->prev, struct page, lru))
 128
 129 #endif