include/linux/mm_inline.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef LINUX_MM_INLINE_H
   3 #define LINUX_MM_INLINE_H
   4
   5 #include <linux/huge_mm.h>
   6 #include <linux/swap.h>
   7
   8 /**
   9  * page_is_file_cache - should the page be on a file LRU or anon LRU?
  10  * @page: the page to test
  11  *
  12  * Returns 1 if @page is page cache page backed by a regular filesystem,
  13  * or 0 if @page is anonymous, tmpfs or otherwise ram or swap backed.
  14  * Used by functions that manipulate the LRU lists, to sort a page
  15  * onto the right LRU list.
  16  *
  17  * We would like to get this info without a page flag, but the state
  18  * needs to survive until the page is last deleted from the LRU, which
  19  * could be as far down as __page_cache_release.
  20  */
  21 static inline int page_is_file_cache(struct page *page)
  22 {
  23         return !PageSwapBacked(page);
  24 }
  25
  26 static __always_inline void __update_lru_size(struct lruvec *lruvec,
  27                                 enum lru_list lru, enum zone_type zid,
  28                                 int nr_pages)
  29 {
  30         struct pglist_data *pgdat = lruvec_pgdat(lruvec);
  31
  32         __mod_node_page_state(pgdat, NR_LRU_BASE + lru, nr_pages);
  33         __mod_zone_page_state(&pgdat->node_zones[zid],
  34                                 NR_ZONE_LRU_BASE + lru, nr_pages);
  35 }
  36
  37 static __always_inline void update_lru_size(struct lruvec *lruvec,
  38                                 enum lru_list lru, enum zone_type zid,
  39                                 int nr_pages)
  40 {
  41         __update_lru_size(lruvec, lru, zid, nr_pages);
  42 #ifdef CONFIG_MEMCG
  43         mem_cgroup_update_lru_size(lruvec, lru, zid, nr_pages);
  44 #endif
  45 }
  46
  47 static __always_inline void add_page_to_lru_list(struct page *page,
  48                                 struct lruvec *lruvec, enum lru_list lru)
  49 {
  50         update_lru_size(lruvec, lru, page_zonenum(page), hpage_nr_pages(page));
  51         list_add(&page->lru, &lruvec->lists[lru]);
  52 }
  53
  54 static __always_inline void add_page_to_lru_list_tail(struct page *page,
  55                                 struct lruvec *lruvec, enum lru_list lru)
  56 {
  57         update_lru_size(lruvec, lru, page_zonenum(page), hpage_nr_pages(page));
  58         list_add_tail(&page->lru, &lruvec->lists[lru]);
  59 }
  60
  61 static __always_inline void del_page_from_lru_list(struct page *page,
  62                                 struct lruvec *lruvec, enum lru_list lru)
  63 {
  64         list_del(&page->lru);
  65         update_lru_size(lruvec, lru, page_zonenum(page), -hpage_nr_pages(page));
  66 }
  67
  68 /**
  69  * page_lru_base_type - which LRU list type should a page be on?
  70  * @page: the page to test
  71  *
  72  * Used for LRU list index arithmetic.
  73  *
  74  * Returns the base LRU type - file or anon - @page should be on.
  75  */
  76 static inline enum lru_list page_lru_base_type(struct page *page)
  77 {
  78         if (page_is_file_cache(page))
  79                 return LRU_INACTIVE_FILE;
  80         return LRU_INACTIVE_ANON;
  81 }
  82
  83 /**
  84  * page_off_lru - which LRU list was page on? clearing its lru flags.
  85  * @page: the page to test
  86  *
  87  * Returns the LRU list a page was on, as an index into the array of LRU
  88  * lists; and clears its Unevictable or Active flags, ready for freeing.
  89  */
  90 static __always_inline enum lru_list page_off_lru(struct page *page)
  91 {
  92         enum lru_list lru;
  93
  94         if (PageUnevictable(page)) {
  95                 __ClearPageUnevictable(page);
  96                 lru = LRU_UNEVICTABLE;
  97         } else {
  98                 lru = page_lru_base_type(page);
  99                 if (PageActive(page)) {
 100                         __ClearPageActive(page);
 101                         lru += LRU_ACTIVE;
 102                 }
 103         }
 104         return lru;
 105 }
 106
 107 /**
 108  * page_lru - which LRU list should a page be on?
 109  * @page: the page to test
 110  *
 111  * Returns the LRU list a page should be on, as an index
 112  * into the array of LRU lists.
 113  */
 114 static __always_inline enum lru_list page_lru(struct page *page)
 115 {
 116         enum lru_list lru;
 117
 118         if (PageUnevictable(page))
 119                 lru = LRU_UNEVICTABLE;
 120         else {
 121                 lru = page_lru_base_type(page);
 122                 if (PageActive(page))
 123                         lru += LRU_ACTIVE;
 124         }
 125         return lru;
 126 }
 127
 128 #define lru_to_page(head) (list_entry((head)->prev, struct page, lru))
 129
 130 #endif