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_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 */
  21static inline int page_is_file_cache(struct page *page)
  22{
  23        return !PageSwapBacked(page);
  24}
  25
  26static __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_lruvec_state(lruvec, 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
  37static __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
  47static __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
  54static __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
  61static __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 */
  76static 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 */
  90static __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 */
 114static __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#endif
 128