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