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1 | #ifndef LINUX_MM_INLINE_H |
2 | #define LINUX_MM_INLINE_H | |
3 | ||
4 | /** | |
5 | * page_is_file_cache - should the page be on a file LRU or anon LRU? | |
6 | * @page: the page to test | |
7 | * | |
4f98a2fe | 8 | * Returns LRU_FILE if @page is page cache page backed by a regular filesystem, |
b2e18538 RR |
9 | * or 0 if @page is anonymous, tmpfs or otherwise ram or swap backed. |
10 | * Used by functions that manipulate the LRU lists, to sort a page | |
11 | * onto the right LRU list. | |
12 | * | |
13 | * We would like to get this info without a page flag, but the state | |
14 | * needs to survive until the page is last deleted from the LRU, which | |
15 | * could be as far down as __page_cache_release. | |
16 | */ | |
17 | static inline int page_is_file_cache(struct page *page) | |
18 | { | |
19 | if (PageSwapBacked(page)) | |
20 | return 0; | |
21 | ||
22 | /* The page is page cache backed by a normal filesystem. */ | |
4f98a2fe | 23 | return LRU_FILE; |
b2e18538 RR |
24 | } |
25 | ||
b69408e8 CL |
26 | static inline void |
27 | add_page_to_lru_list(struct zone *zone, struct page *page, enum lru_list l) | |
28 | { | |
29 | list_add(&page->lru, &zone->lru[l].list); | |
30 | __inc_zone_state(zone, NR_LRU_BASE + l); | |
08e552c6 | 31 | mem_cgroup_add_lru_list(page, l); |
b69408e8 CL |
32 | } |
33 | ||
34 | static inline void | |
35 | del_page_from_lru_list(struct zone *zone, struct page *page, enum lru_list l) | |
36 | { | |
37 | list_del(&page->lru); | |
38 | __dec_zone_state(zone, NR_LRU_BASE + l); | |
08e552c6 | 39 | mem_cgroup_del_lru_list(page, l); |
b69408e8 CL |
40 | } |
41 | ||
1da177e4 LT |
42 | static inline void |
43 | del_page_from_lru(struct zone *zone, struct page *page) | |
44 | { | |
4f98a2fe | 45 | enum lru_list l = LRU_BASE; |
b69408e8 | 46 | |
1da177e4 | 47 | list_del(&page->lru); |
894bc310 LS |
48 | if (PageUnevictable(page)) { |
49 | __ClearPageUnevictable(page); | |
50 | l = LRU_UNEVICTABLE; | |
51 | } else { | |
52 | if (PageActive(page)) { | |
53 | __ClearPageActive(page); | |
54 | l += LRU_ACTIVE; | |
55 | } | |
56 | l += page_is_file_cache(page); | |
1da177e4 | 57 | } |
b69408e8 | 58 | __dec_zone_state(zone, NR_LRU_BASE + l); |
08e552c6 | 59 | mem_cgroup_del_lru_list(page, l); |
1da177e4 | 60 | } |
21eac81f | 61 | |
b69408e8 CL |
62 | /** |
63 | * page_lru - which LRU list should a page be on? | |
64 | * @page: the page to test | |
65 | * | |
66 | * Returns the LRU list a page should be on, as an index | |
67 | * into the array of LRU lists. | |
68 | */ | |
69 | static inline enum lru_list page_lru(struct page *page) | |
70 | { | |
71 | enum lru_list lru = LRU_BASE; | |
72 | ||
894bc310 LS |
73 | if (PageUnevictable(page)) |
74 | lru = LRU_UNEVICTABLE; | |
75 | else { | |
76 | if (PageActive(page)) | |
77 | lru += LRU_ACTIVE; | |
78 | lru += page_is_file_cache(page); | |
79 | } | |
b69408e8 CL |
80 | |
81 | return lru; | |
82 | } | |
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83 | |
84 | #endif |