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 #ifdef CONFIG_HIGHMEM
   8 extern atomic_t highmem_file_pages;
   9
  10 static inline void acct_highmem_file_pages(int zid, enum lru_list lru,
  11                                                         int nr_pages)
  12 {
  13         if (is_highmem_idx(zid) && is_file_lru(lru))
  14                 atomic_add(nr_pages, &highmem_file_pages);
  15 }
  16 #else
  17 static inline void acct_highmem_file_pages(int zid, enum lru_list lru,
  18                                                         int nr_pages)
  19 {
  20 }
  21 #endif
  22
  23 /**
  24  * page_is_file_cache - should the page be on a file LRU or anon LRU?
  25  * @page: the page to test
  26  *
  27  * Returns 1 if @page is page cache page backed by a regular filesystem,
  28  * or 0 if @page is anonymous, tmpfs or otherwise ram or swap backed.
  29  * Used by functions that manipulate the LRU lists, to sort a page
  30  * onto the right LRU list.
  31  *
  32  * We would like to get this info without a page flag, but the state
  33  * needs to survive until the page is last deleted from the LRU, which
  34  * could be as far down as __page_cache_release.
  35  */
  36 static inline int page_is_file_cache(struct page *page)
  37 {
  38         return !PageSwapBacked(page);
  39 }
  40
  41 static __always_inline void __update_lru_size(struct lruvec *lruvec,
  42                                 enum lru_list lru, enum zone_type zid,
  43                                 int nr_pages)
  44 {
  45         struct pglist_data *pgdat = lruvec_pgdat(lruvec);
  46
  47         __mod_node_page_state(pgdat, NR_LRU_BASE + lru, nr_pages);
  48         acct_highmem_file_pages(zid, lru, nr_pages);
  49 }
  50
  51 static __always_inline void update_lru_size(struct lruvec *lruvec,
  52                                 enum lru_list lru, enum zone_type zid,
  53                                 int nr_pages)
  54 {
  55         __update_lru_size(lruvec, lru, zid, nr_pages);
  56 #ifdef CONFIG_MEMCG
  57         mem_cgroup_update_lru_size(lruvec, lru, nr_pages);
  58 #endif
  59 }
  60
  61 static __always_inline void add_page_to_lru_list(struct page *page,
  62                                 struct lruvec *lruvec, enum lru_list lru)
  63 {
  64         update_lru_size(lruvec, lru, page_zonenum(page), hpage_nr_pages(page));
  65         list_add(&page->lru, &lruvec->lists[lru]);
  66 }
  67
  68 static __always_inline void del_page_from_lru_list(struct page *page,
  69                                 struct lruvec *lruvec, enum lru_list lru)
  70 {
  71         list_del(&page->lru);
  72         update_lru_size(lruvec, lru, page_zonenum(page), -hpage_nr_pages(page));
  73 }
  74
  75 /**
  76  * page_lru_base_type - which LRU list type should a page be on?
  77  * @page: the page to test
  78  *
  79  * Used for LRU list index arithmetic.
  80  *
  81  * Returns the base LRU type - file or anon - @page should be on.
  82  */
  83 static inline enum lru_list page_lru_base_type(struct page *page)
  84 {
  85         if (page_is_file_cache(page))
  86                 return LRU_INACTIVE_FILE;
  87         return LRU_INACTIVE_ANON;
  88 }
  89
  90 /**
  91  * page_off_lru - which LRU list was page on? clearing its lru flags.
  92  * @page: the page to test
  93  *
  94  * Returns the LRU list a page was on, as an index into the array of LRU
  95  * lists; and clears its Unevictable or Active flags, ready for freeing.
  96  */
  97 static __always_inline enum lru_list page_off_lru(struct page *page)
  98 {
  99         enum lru_list lru;
 100
 101         if (PageUnevictable(page)) {
 102                 __ClearPageUnevictable(page);
 103                 lru = LRU_UNEVICTABLE;
 104         } else {
 105                 lru = page_lru_base_type(page);
 106                 if (PageActive(page)) {
 107                         __ClearPageActive(page);
 108                         lru += LRU_ACTIVE;
 109                 }
 110         }
 111         return lru;
 112 }
 113
 114 /**
 115  * page_lru - which LRU list should a page be on?
 116  * @page: the page to test
 117  *
 118  * Returns the LRU list a page should be on, as an index
 119  * into the array of LRU lists.
 120  */
 121 static __always_inline enum lru_list page_lru(struct page *page)
 122 {
 123         enum lru_list lru;
 124
 125         if (PageUnevictable(page))
 126                 lru = LRU_UNEVICTABLE;
 127         else {
 128                 lru = page_lru_base_type(page);
 129                 if (PageActive(page))
 130                         lru += LRU_ACTIVE;
 131         }
 132         return lru;
 133 }
 134
 135 #define lru_to_page(head) (list_entry((head)->prev, struct page, lru))
 136
 137 #endif