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 LRU_FILE 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 */
page_is_file_cache(struct page * page)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. */
23 return LRU_FILE;
24 }
25
26 static inline void
add_page_to_lru_list(struct zone * zone,struct page * page,enum lru_list l)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 mem_cgroup_add_lru_list(page, l);
32 }
33
34 static inline void
del_page_from_lru_list(struct zone * zone,struct page * page,enum lru_list l)35 del_page_from_lru_list(struct zone *zone, struct page *page, enum lru_list l)
36 {
37 list_del(&page->lru);
38 __dec_zone_state(zone, NR_LRU_BASE + l);
39 mem_cgroup_del_lru_list(page, l);
40 }
41
42 static inline void
del_page_from_lru(struct zone * zone,struct page * page)43 del_page_from_lru(struct zone *zone, struct page *page)
44 {
45 enum lru_list l = LRU_BASE;
46
47 list_del(&page->lru);
48 if (PageUnevictable(page)) {
49 __ClearPageUnevictable(page);
50 l = LRU_UNEVICTABLE;
51 } else {
52 if (PageActive(page)) {
53 __ClearPageActive(page);
54 l += LRU_ACTIVE;
55 }
56 l += page_is_file_cache(page);
57 }
58 __dec_zone_state(zone, NR_LRU_BASE + l);
59 mem_cgroup_del_lru_list(page, l);
60 }
61
62 /**
63 * page_lru - which LRU list should a page be on?
64 * @page: the page to test
65 *
66 * Returns the LRU list a page should be on, as an index
67 * into the array of LRU lists.
68 */
page_lru(struct page * page)69 static inline enum lru_list page_lru(struct page *page)
70 {
71 enum lru_list lru = LRU_BASE;
72
73 if (PageUnevictable(page))
74 lru = LRU_UNEVICTABLE;
75 else {
76 if (PageActive(page))
77 lru += LRU_ACTIVE;
78 lru += page_is_file_cache(page);
79 }
80
81 return lru;
82 }
83
84 #endif
85