Linux kernel mirror (for testing)
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linux
1#ifndef LINUX_MM_INLINE_H
2#define LINUX_MM_INLINE_H
3
4#include <linux/huge_mm.h>
5
6/**
7 * page_is_file_cache - should the page be on a file LRU or anon LRU?
8 * @page: the page to test
9 *
10 * Returns 1 if @page is page cache page backed by a regular filesystem,
11 * or 0 if @page is anonymous, tmpfs or otherwise ram or swap backed.
12 * Used by functions that manipulate the LRU lists, to sort a page
13 * onto the right LRU list.
14 *
15 * We would like to get this info without a page flag, but the state
16 * needs to survive until the page is last deleted from the LRU, which
17 * could be as far down as __page_cache_release.
18 */
19static inline int page_is_file_cache(struct page *page)
20{
21 return !PageSwapBacked(page);
22}
23
24static __always_inline void add_page_to_lru_list(struct page *page,
25 struct lruvec *lruvec, enum lru_list lru)
26{
27 int nr_pages = hpage_nr_pages(page);
28 mem_cgroup_update_lru_size(lruvec, lru, nr_pages);
29 list_add(&page->lru, &lruvec->lists[lru]);
30 __mod_zone_page_state(lruvec_zone(lruvec), NR_LRU_BASE + lru, nr_pages);
31}
32
33static __always_inline void del_page_from_lru_list(struct page *page,
34 struct lruvec *lruvec, enum lru_list lru)
35{
36 int nr_pages = hpage_nr_pages(page);
37 mem_cgroup_update_lru_size(lruvec, lru, -nr_pages);
38 list_del(&page->lru);
39 __mod_zone_page_state(lruvec_zone(lruvec), NR_LRU_BASE + lru, -nr_pages);
40}
41
42/**
43 * page_lru_base_type - which LRU list type should a page be on?
44 * @page: the page to test
45 *
46 * Used for LRU list index arithmetic.
47 *
48 * Returns the base LRU type - file or anon - @page should be on.
49 */
50static inline enum lru_list page_lru_base_type(struct page *page)
51{
52 if (page_is_file_cache(page))
53 return LRU_INACTIVE_FILE;
54 return LRU_INACTIVE_ANON;
55}
56
57/**
58 * page_off_lru - which LRU list was page on? clearing its lru flags.
59 * @page: the page to test
60 *
61 * Returns the LRU list a page was on, as an index into the array of LRU
62 * lists; and clears its Unevictable or Active flags, ready for freeing.
63 */
64static __always_inline enum lru_list page_off_lru(struct page *page)
65{
66 enum lru_list lru;
67
68 if (PageUnevictable(page)) {
69 __ClearPageUnevictable(page);
70 lru = LRU_UNEVICTABLE;
71 } else {
72 lru = page_lru_base_type(page);
73 if (PageActive(page)) {
74 __ClearPageActive(page);
75 lru += LRU_ACTIVE;
76 }
77 }
78 return lru;
79}
80
81/**
82 * page_lru - which LRU list should a page be on?
83 * @page: the page to test
84 *
85 * Returns the LRU list a page should be on, as an index
86 * into the array of LRU lists.
87 */
88static __always_inline enum lru_list page_lru(struct page *page)
89{
90 enum lru_list lru;
91
92 if (PageUnevictable(page))
93 lru = LRU_UNEVICTABLE;
94 else {
95 lru = page_lru_base_type(page);
96 if (PageActive(page))
97 lru += LRU_ACTIVE;
98 }
99 return lru;
100}
101
102#endif