LXR linux/include/linux/mm

   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 */
  22static inline int page_is_file_lru(struct page *page)
  23{
  24        return !PageSwapBacked(page);
  25}
  26
  27static __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
  38static __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
  48static __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
  55static __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
  62static __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 */
  77static 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 */
  91static __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 */
 115static __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
 129