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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 | |
bca67592 MG |
7 | #ifdef CONFIG_HIGHMEM |
8 | extern atomic_t highmem_file_pages; | |
9 | ||
10 | static inline void acct_highmem_file_pages(int zid, enum lru_list lru, | |
11 | int nr_pages) | |
12 | { | |
13 | if (is_highmem_idx(zid) && is_file_lru(lru)) | |
14 | atomic_add(nr_pages, &highmem_file_pages); | |
15 | } | |
16 | #else | |
17 | static inline void acct_highmem_file_pages(int zid, enum lru_list lru, | |
18 | int nr_pages) | |
19 | { | |
20 | } | |
21 | #endif | |
22 | ||
b2e18538 RR |
23 | /** |
24 | * page_is_file_cache - should the page be on a file LRU or anon LRU? | |
25 | * @page: the page to test | |
26 | * | |
6c0b1351 | 27 | * Returns 1 if @page is page cache page backed by a regular filesystem, |
b2e18538 RR |
28 | * or 0 if @page is anonymous, tmpfs or otherwise ram or swap backed. |
29 | * Used by functions that manipulate the LRU lists, to sort a page | |
30 | * onto the right LRU list. | |
31 | * | |
32 | * We would like to get this info without a page flag, but the state | |
33 | * needs to survive until the page is last deleted from the LRU, which | |
34 | * could be as far down as __page_cache_release. | |
35 | */ | |
36 | static inline int page_is_file_cache(struct page *page) | |
37 | { | |
6c0b1351 | 38 | return !PageSwapBacked(page); |
b2e18538 RR |
39 | } |
40 | ||
9d5e6a9f | 41 | static __always_inline void __update_lru_size(struct lruvec *lruvec, |
599d0c95 MG |
42 | enum lru_list lru, enum zone_type zid, |
43 | int nr_pages) | |
9d5e6a9f | 44 | { |
599d0c95 MG |
45 | struct pglist_data *pgdat = lruvec_pgdat(lruvec); |
46 | ||
47 | __mod_node_page_state(pgdat, NR_LRU_BASE + lru, nr_pages); | |
bca67592 | 48 | acct_highmem_file_pages(zid, lru, nr_pages); |
9d5e6a9f HD |
49 | } |
50 | ||
51 | static __always_inline void update_lru_size(struct lruvec *lruvec, | |
599d0c95 MG |
52 | enum lru_list lru, enum zone_type zid, |
53 | int nr_pages) | |
9d5e6a9f | 54 | { |
599d0c95 | 55 | __update_lru_size(lruvec, lru, zid, nr_pages); |
7ee36a14 MG |
56 | #ifdef CONFIG_MEMCG |
57 | mem_cgroup_update_lru_size(lruvec, lru, nr_pages); | |
9d5e6a9f HD |
58 | #endif |
59 | } | |
60 | ||
fa9add64 HD |
61 | static __always_inline void add_page_to_lru_list(struct page *page, |
62 | struct lruvec *lruvec, enum lru_list lru) | |
71e3aac0 | 63 | { |
599d0c95 | 64 | update_lru_size(lruvec, lru, page_zonenum(page), hpage_nr_pages(page)); |
4111304d | 65 | list_add(&page->lru, &lruvec->lists[lru]); |
71e3aac0 AA |
66 | } |
67 | ||
fa9add64 HD |
68 | static __always_inline void del_page_from_lru_list(struct page *page, |
69 | struct lruvec *lruvec, enum lru_list lru) | |
b69408e8 CL |
70 | { |
71 | list_del(&page->lru); | |
599d0c95 | 72 | update_lru_size(lruvec, lru, page_zonenum(page), -hpage_nr_pages(page)); |
b69408e8 CL |
73 | } |
74 | ||
401a8e1c JW |
75 | /** |
76 | * page_lru_base_type - which LRU list type should a page be on? | |
77 | * @page: the page to test | |
78 | * | |
79 | * Used for LRU list index arithmetic. | |
80 | * | |
81 | * Returns the base LRU type - file or anon - @page should be on. | |
82 | */ | |
83 | static inline enum lru_list page_lru_base_type(struct page *page) | |
84 | { | |
85 | if (page_is_file_cache(page)) | |
86 | return LRU_INACTIVE_FILE; | |
87 | return LRU_INACTIVE_ANON; | |
88 | } | |
89 | ||
1c1c53d4 HD |
90 | /** |
91 | * page_off_lru - which LRU list was page on? clearing its lru flags. | |
92 | * @page: the page to test | |
93 | * | |
94 | * Returns the LRU list a page was on, as an index into the array of LRU | |
95 | * lists; and clears its Unevictable or Active flags, ready for freeing. | |
96 | */ | |
014483bc | 97 | static __always_inline enum lru_list page_off_lru(struct page *page) |
1da177e4 | 98 | { |
4111304d | 99 | enum lru_list lru; |
b69408e8 | 100 | |
894bc310 LS |
101 | if (PageUnevictable(page)) { |
102 | __ClearPageUnevictable(page); | |
4111304d | 103 | lru = LRU_UNEVICTABLE; |
894bc310 | 104 | } else { |
4111304d | 105 | lru = page_lru_base_type(page); |
894bc310 LS |
106 | if (PageActive(page)) { |
107 | __ClearPageActive(page); | |
4111304d | 108 | lru += LRU_ACTIVE; |
894bc310 | 109 | } |
1da177e4 | 110 | } |
1c1c53d4 | 111 | return lru; |
1da177e4 | 112 | } |
21eac81f | 113 | |
b69408e8 CL |
114 | /** |
115 | * page_lru - which LRU list should a page be on? | |
116 | * @page: the page to test | |
117 | * | |
118 | * Returns the LRU list a page should be on, as an index | |
119 | * into the array of LRU lists. | |
120 | */ | |
014483bc | 121 | static __always_inline enum lru_list page_lru(struct page *page) |
b69408e8 | 122 | { |
401a8e1c | 123 | enum lru_list lru; |
b69408e8 | 124 | |
894bc310 LS |
125 | if (PageUnevictable(page)) |
126 | lru = LRU_UNEVICTABLE; | |
127 | else { | |
401a8e1c | 128 | lru = page_lru_base_type(page); |
894bc310 LS |
129 | if (PageActive(page)) |
130 | lru += LRU_ACTIVE; | |
894bc310 | 131 | } |
b69408e8 CL |
132 | return lru; |
133 | } | |
b2e18538 | 134 | |
d72ee911 GT |
135 | #define lru_to_page(head) (list_entry((head)->prev, struct page, lru)) |
136 | ||
b2e18538 | 137 | #endif |