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 */
page_is_file_lru(struct page * page)22 static inline int page_is_file_lru(struct page *page)
23 {
24 return !PageSwapBacked(page);
25 }
26
__update_lru_size(struct lruvec * lruvec,enum lru_list lru,enum zone_type zid,int nr_pages)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
update_lru_size(struct lruvec * lruvec,enum lru_list lru,enum zone_type zid,int nr_pages)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
add_page_to_lru_list(struct page * page,struct lruvec * lruvec,enum lru_list lru)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), thp_nr_pages(page));
52 list_add(&page->lru, &lruvec->lists[lru]);
53 }
54
add_page_to_lru_list_tail(struct page * page,struct lruvec * lruvec,enum lru_list lru)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), thp_nr_pages(page));
59 list_add_tail(&page->lru, &lruvec->lists[lru]);
60 }
61
del_page_from_lru_list(struct page * page,struct lruvec * lruvec,enum lru_list lru)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), -thp_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 */
page_lru_base_type(struct page * page)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 */
page_off_lru(struct page * page)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 */
page_lru(struct page * page)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
129