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 #ifdef CONFIG_MEMCG
  37         mem_cgroup_update_lru_size(lruvec, lru, zid, nr_pages);
  38 #endif
  39 }
  40
  41 /**
  42  * __clear_page_lru_flags - clear page lru flags before releasing a page
  43  * @page: the page that was on lru and now has a zero reference
  44  */
  45 static __always_inline void __clear_page_lru_flags(struct page *page)
  46 {
  47         VM_BUG_ON_PAGE(!PageLRU(page), page);
  48
  49         __ClearPageLRU(page);
  50
  51         /* this shouldn't happen, so leave the flags to bad_page() */
  52         if (PageActive(page) && PageUnevictable(page))
  53                 return;
  54
  55         __ClearPageActive(page);
  56         __ClearPageUnevictable(page);
  57 }
  58
  59 /**
  60  * page_lru - which LRU list should a page be on?
  61  * @page: the page to test
  62  *
  63  * Returns the LRU list a page should be on, as an index
  64  * into the array of LRU lists.
  65  */
  66 static __always_inline enum lru_list page_lru(struct page *page)
  67 {
  68         enum lru_list lru;
  69
  70         VM_BUG_ON_PAGE(PageActive(page) && PageUnevictable(page), page);
  71
  72         if (PageUnevictable(page))
  73                 return LRU_UNEVICTABLE;
  74
  75         lru = page_is_file_lru(page) ? LRU_INACTIVE_FILE : LRU_INACTIVE_ANON;
  76         if (PageActive(page))
  77                 lru += LRU_ACTIVE;
  78
  79         return lru;
  80 }
  81
  82 static __always_inline void add_page_to_lru_list(struct page *page,
  83                                 struct lruvec *lruvec)
  84 {
  85         enum lru_list lru = page_lru(page);
  86
  87         update_lru_size(lruvec, lru, page_zonenum(page), thp_nr_pages(page));
  88         list_add(&page->lru, &lruvec->lists[lru]);
  89 }
  90
  91 static __always_inline void add_page_to_lru_list_tail(struct page *page,
  92                                 struct lruvec *lruvec)
  93 {
  94         enum lru_list lru = page_lru(page);
  95
  96         update_lru_size(lruvec, lru, page_zonenum(page), thp_nr_pages(page));
  97         list_add_tail(&page->lru, &lruvec->lists[lru]);
  98 }
  99
 100 static __always_inline void del_page_from_lru_list(struct page *page,
 101                                 struct lruvec *lruvec)
 102 {
 103         list_del(&page->lru);
 104         update_lru_size(lruvec, page_lru(page), page_zonenum(page),
 105                         -thp_nr_pages(page));
 106 }
 107 #endif