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b2e18538 RR |
1 | #ifndef LINUX_MM_INLINE_H |
2 | #define LINUX_MM_INLINE_H | |
3 | ||
2c888cfb | 4 | #include <linux/huge_mm.h> |
6e543d57 | 5 | #include <linux/swap.h> |
2c888cfb | 6 | |
b2e18538 RR |
7 | /** |
8 | * page_is_file_cache - should the page be on a file LRU or anon LRU? | |
9 | * @page: the page to test | |
10 | * | |
6c0b1351 | 11 | * Returns 1 if @page is page cache page backed by a regular filesystem, |
b2e18538 RR |
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 | */ | |
20 | static inline int page_is_file_cache(struct page *page) | |
21 | { | |
6c0b1351 | 22 | return !PageSwapBacked(page); |
b2e18538 RR |
23 | } |
24 | ||
9d5e6a9f HD |
25 | static __always_inline void __update_lru_size(struct lruvec *lruvec, |
26 | enum lru_list lru, int nr_pages) | |
27 | { | |
28 | __mod_zone_page_state(lruvec_zone(lruvec), NR_LRU_BASE + lru, nr_pages); | |
29 | } | |
30 | ||
31 | static __always_inline void update_lru_size(struct lruvec *lruvec, | |
32 | enum lru_list lru, int nr_pages) | |
33 | { | |
34 | #ifdef CONFIG_MEMCG | |
35 | mem_cgroup_update_lru_size(lruvec, lru, nr_pages); | |
36 | #else | |
37 | __update_lru_size(lruvec, lru, nr_pages); | |
38 | #endif | |
39 | } | |
40 | ||
fa9add64 HD |
41 | static __always_inline void add_page_to_lru_list(struct page *page, |
42 | struct lruvec *lruvec, enum lru_list lru) | |
71e3aac0 | 43 | { |
9d5e6a9f | 44 | update_lru_size(lruvec, lru, hpage_nr_pages(page)); |
4111304d | 45 | list_add(&page->lru, &lruvec->lists[lru]); |
71e3aac0 AA |
46 | } |
47 | ||
fa9add64 HD |
48 | static __always_inline void del_page_from_lru_list(struct page *page, |
49 | struct lruvec *lruvec, enum lru_list lru) | |
b69408e8 CL |
50 | { |
51 | list_del(&page->lru); | |
9d5e6a9f | 52 | update_lru_size(lruvec, lru, -hpage_nr_pages(page)); |
b69408e8 CL |
53 | } |
54 | ||
401a8e1c JW |
55 | /** |
56 | * page_lru_base_type - which LRU list type should a page be on? | |
57 | * @page: the page to test | |
58 | * | |
59 | * Used for LRU list index arithmetic. | |
60 | * | |
61 | * Returns the base LRU type - file or anon - @page should be on. | |
62 | */ | |
63 | static inline enum lru_list page_lru_base_type(struct page *page) | |
64 | { | |
65 | if (page_is_file_cache(page)) | |
66 | return LRU_INACTIVE_FILE; | |
67 | return LRU_INACTIVE_ANON; | |
68 | } | |
69 | ||
1c1c53d4 HD |
70 | /** |
71 | * page_off_lru - which LRU list was page on? clearing its lru flags. | |
72 | * @page: the page to test | |
73 | * | |
74 | * Returns the LRU list a page was on, as an index into the array of LRU | |
75 | * lists; and clears its Unevictable or Active flags, ready for freeing. | |
76 | */ | |
014483bc | 77 | static __always_inline enum lru_list page_off_lru(struct page *page) |
1da177e4 | 78 | { |
4111304d | 79 | enum lru_list lru; |
b69408e8 | 80 | |
894bc310 LS |
81 | if (PageUnevictable(page)) { |
82 | __ClearPageUnevictable(page); | |
4111304d | 83 | lru = LRU_UNEVICTABLE; |
894bc310 | 84 | } else { |
4111304d | 85 | lru = page_lru_base_type(page); |
894bc310 LS |
86 | if (PageActive(page)) { |
87 | __ClearPageActive(page); | |
4111304d | 88 | lru += LRU_ACTIVE; |
894bc310 | 89 | } |
1da177e4 | 90 | } |
1c1c53d4 | 91 | return lru; |
1da177e4 | 92 | } |
21eac81f | 93 | |
b69408e8 CL |
94 | /** |
95 | * page_lru - which LRU list should a page be on? | |
96 | * @page: the page to test | |
97 | * | |
98 | * Returns the LRU list a page should be on, as an index | |
99 | * into the array of LRU lists. | |
100 | */ | |
014483bc | 101 | static __always_inline enum lru_list page_lru(struct page *page) |
b69408e8 | 102 | { |
401a8e1c | 103 | enum lru_list lru; |
b69408e8 | 104 | |
894bc310 LS |
105 | if (PageUnevictable(page)) |
106 | lru = LRU_UNEVICTABLE; | |
107 | else { | |
401a8e1c | 108 | lru = page_lru_base_type(page); |
894bc310 LS |
109 | if (PageActive(page)) |
110 | lru += LRU_ACTIVE; | |
894bc310 | 111 | } |
b69408e8 CL |
112 | return lru; |
113 | } | |
b2e18538 | 114 | |
d72ee911 GT |
115 | #define lru_to_page(head) (list_entry((head)->prev, struct page, lru)) |
116 | ||
b2e18538 | 117 | #endif |