Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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linux
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 *
8 * Returns 1 if @page is page cache page backed by a regular filesystem,
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 */
17static inline int page_is_file_cache(struct page *page)
18{
19 return !PageSwapBacked(page);
20}
21
22static inline void
23add_page_to_lru_list(struct zone *zone, struct page *page, enum lru_list l)
24{
25 list_add(&page->lru, &zone->lru[l].list);
26 __inc_zone_state(zone, NR_LRU_BASE + l);
27 mem_cgroup_add_lru_list(page, l);
28}
29
30static inline void
31del_page_from_lru_list(struct zone *zone, struct page *page, enum lru_list l)
32{
33 list_del(&page->lru);
34 __dec_zone_state(zone, NR_LRU_BASE + l);
35 mem_cgroup_del_lru_list(page, l);
36}
37
38/**
39 * page_lru_base_type - which LRU list type should a page be on?
40 * @page: the page to test
41 *
42 * Used for LRU list index arithmetic.
43 *
44 * Returns the base LRU type - file or anon - @page should be on.
45 */
46static inline enum lru_list page_lru_base_type(struct page *page)
47{
48 if (page_is_file_cache(page))
49 return LRU_INACTIVE_FILE;
50 return LRU_INACTIVE_ANON;
51}
52
53static inline void
54del_page_from_lru(struct zone *zone, struct page *page)
55{
56 enum lru_list l;
57
58 list_del(&page->lru);
59 if (PageUnevictable(page)) {
60 __ClearPageUnevictable(page);
61 l = LRU_UNEVICTABLE;
62 } else {
63 l = page_lru_base_type(page);
64 if (PageActive(page)) {
65 __ClearPageActive(page);
66 l += LRU_ACTIVE;
67 }
68 }
69 __dec_zone_state(zone, NR_LRU_BASE + l);
70 mem_cgroup_del_lru_list(page, l);
71}
72
73/**
74 * page_lru - which LRU list should a page be on?
75 * @page: the page to test
76 *
77 * Returns the LRU list a page should be on, as an index
78 * into the array of LRU lists.
79 */
80static inline enum lru_list page_lru(struct page *page)
81{
82 enum lru_list lru;
83
84 if (PageUnevictable(page))
85 lru = LRU_UNEVICTABLE;
86 else {
87 lru = page_lru_base_type(page);
88 if (PageActive(page))
89 lru += LRU_ACTIVE;
90 }
91
92 return lru;
93}
94
95#endif