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