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b2e18538 RR |
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); | |
31 | } | |
32 | ||
33 | static inline void | |
34 | del_page_from_lru_list(struct zone *zone, struct page *page, enum lru_list l) | |
35 | { | |
36 | list_del(&page->lru); | |
37 | __dec_zone_state(zone, NR_LRU_BASE + l); | |
38 | } | |
39 | ||
1da177e4 | 40 | static inline void |
4f98a2fe | 41 | add_page_to_inactive_anon_list(struct zone *zone, struct page *page) |
1da177e4 | 42 | { |
4f98a2fe | 43 | add_page_to_lru_list(zone, page, LRU_INACTIVE_ANON); |
1da177e4 LT |
44 | } |
45 | ||
46 | static inline void | |
4f98a2fe | 47 | add_page_to_active_anon_list(struct zone *zone, struct page *page) |
1da177e4 | 48 | { |
4f98a2fe | 49 | add_page_to_lru_list(zone, page, LRU_ACTIVE_ANON); |
1da177e4 LT |
50 | } |
51 | ||
52 | static inline void | |
4f98a2fe | 53 | add_page_to_inactive_file_list(struct zone *zone, struct page *page) |
1da177e4 | 54 | { |
4f98a2fe | 55 | add_page_to_lru_list(zone, page, LRU_INACTIVE_FILE); |
1da177e4 LT |
56 | } |
57 | ||
58 | static inline void | |
4f98a2fe | 59 | add_page_to_active_file_list(struct zone *zone, struct page *page) |
1da177e4 | 60 | { |
4f98a2fe RR |
61 | add_page_to_lru_list(zone, page, LRU_ACTIVE_FILE); |
62 | } | |
63 | ||
64 | static inline void | |
65 | del_page_from_inactive_anon_list(struct zone *zone, struct page *page) | |
66 | { | |
67 | del_page_from_lru_list(zone, page, LRU_INACTIVE_ANON); | |
68 | } | |
69 | ||
70 | static inline void | |
71 | del_page_from_active_anon_list(struct zone *zone, struct page *page) | |
72 | { | |
73 | del_page_from_lru_list(zone, page, LRU_ACTIVE_ANON); | |
74 | } | |
75 | ||
76 | static inline void | |
77 | del_page_from_inactive_file_list(struct zone *zone, struct page *page) | |
78 | { | |
79 | del_page_from_lru_list(zone, page, LRU_INACTIVE_FILE); | |
80 | } | |
81 | ||
82 | static inline void | |
83 | del_page_from_active_file_list(struct zone *zone, struct page *page) | |
84 | { | |
85 | del_page_from_lru_list(zone, page, LRU_INACTIVE_FILE); | |
1da177e4 LT |
86 | } |
87 | ||
88 | static inline void | |
89 | del_page_from_lru(struct zone *zone, struct page *page) | |
90 | { | |
4f98a2fe | 91 | enum lru_list l = LRU_BASE; |
b69408e8 | 92 | |
1da177e4 | 93 | list_del(&page->lru); |
894bc310 LS |
94 | if (PageUnevictable(page)) { |
95 | __ClearPageUnevictable(page); | |
96 | l = LRU_UNEVICTABLE; | |
97 | } else { | |
98 | if (PageActive(page)) { | |
99 | __ClearPageActive(page); | |
100 | l += LRU_ACTIVE; | |
101 | } | |
102 | l += page_is_file_cache(page); | |
1da177e4 | 103 | } |
b69408e8 | 104 | __dec_zone_state(zone, NR_LRU_BASE + l); |
1da177e4 | 105 | } |
21eac81f | 106 | |
b69408e8 CL |
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 | */ | |
114 | static inline enum lru_list page_lru(struct page *page) | |
115 | { | |
116 | enum lru_list lru = LRU_BASE; | |
117 | ||
894bc310 LS |
118 | if (PageUnevictable(page)) |
119 | lru = LRU_UNEVICTABLE; | |
120 | else { | |
121 | if (PageActive(page)) | |
122 | lru += LRU_ACTIVE; | |
123 | lru += page_is_file_cache(page); | |
124 | } | |
b69408e8 CL |
125 | |
126 | return lru; | |
127 | } | |
b2e18538 | 128 | |
556adecb RR |
129 | /** |
130 | * inactive_anon_is_low - check if anonymous pages need to be deactivated | |
131 | * @zone: zone to check | |
132 | * | |
133 | * Returns true if the zone does not have enough inactive anon pages, | |
134 | * meaning some active anon pages need to be deactivated. | |
135 | */ | |
136 | static inline int inactive_anon_is_low(struct zone *zone) | |
137 | { | |
138 | unsigned long active, inactive; | |
139 | ||
140 | active = zone_page_state(zone, NR_ACTIVE_ANON); | |
141 | inactive = zone_page_state(zone, NR_INACTIVE_ANON); | |
142 | ||
143 | if (inactive * zone->inactive_ratio < active) | |
144 | return 1; | |
145 | ||
146 | return 0; | |
147 | } | |
b2e18538 | 148 | #endif |