Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
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 inline void
25__add_page_to_lru_list(struct zone *zone, struct page *page, enum lru_list l,
26 struct list_head *head)
27{
28 list_add(&page->lru, head);
29 __mod_zone_page_state(zone, NR_LRU_BASE + l, hpage_nr_pages(page));
30 mem_cgroup_add_lru_list(page, l);
31}
32
33static inline void
34add_page_to_lru_list(struct zone *zone, struct page *page, enum lru_list l)
35{
36 __add_page_to_lru_list(zone, page, l, &zone->lru[l].list);
37}
38
39static inline void
40del_page_from_lru_list(struct zone *zone, struct page *page, enum lru_list l)
41{
42 list_del(&page->lru);
43 __mod_zone_page_state(zone, NR_LRU_BASE + l, -hpage_nr_pages(page));
44 mem_cgroup_del_lru_list(page, l);
45}
46
47/**
48 * page_lru_base_type - which LRU list type should a page be on?
49 * @page: the page to test
50 *
51 * Used for LRU list index arithmetic.
52 *
53 * Returns the base LRU type - file or anon - @page should be on.
54 */
55static inline enum lru_list page_lru_base_type(struct page *page)
56{
57 if (page_is_file_cache(page))
58 return LRU_INACTIVE_FILE;
59 return LRU_INACTIVE_ANON;
60}
61
62static inline void
63del_page_from_lru(struct zone *zone, struct page *page)
64{
65 enum lru_list l;
66
67 list_del(&page->lru);
68 if (PageUnevictable(page)) {
69 __ClearPageUnevictable(page);
70 l = LRU_UNEVICTABLE;
71 } else {
72 l = page_lru_base_type(page);
73 if (PageActive(page)) {
74 __ClearPageActive(page);
75 l += LRU_ACTIVE;
76 }
77 }
78 __mod_zone_page_state(zone, NR_LRU_BASE + l, -hpage_nr_pages(page));
79 mem_cgroup_del_lru_list(page, l);
80}
81
82/**
83 * page_lru - which LRU list should a page be on?
84 * @page: the page to test
85 *
86 * Returns the LRU list a page should be on, as an index
87 * into the array of LRU lists.
88 */
89static inline enum lru_list page_lru(struct page *page)
90{
91 enum lru_list lru;
92
93 if (PageUnevictable(page))
94 lru = LRU_UNEVICTABLE;
95 else {
96 lru = page_lru_base_type(page);
97 if (PageActive(page))
98 lru += LRU_ACTIVE;
99 }
100
101 return lru;
102}
103
104#endif