aboutsummaryrefslogtreecommitdiff
path: root/include/linux/mm_inline.h
blob: 227fd3e9a9c9370398478005d01344f5a42cb02d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
#ifndef LINUX_MM_INLINE_H
#define LINUX_MM_INLINE_H

#include <linux/huge_mm.h>

/**
 * page_is_file_cache - should the page be on a file LRU or anon LRU?
 * @page: the page to test
 *
 * Returns 1 if @page is page cache page backed by a regular filesystem,
 * or 0 if @page is anonymous, tmpfs or otherwise ram or swap backed.
 * Used by functions that manipulate the LRU lists, to sort a page
 * onto the right LRU list.
 *
 * We would like to get this info without a page flag, but the state
 * needs to survive until the page is last deleted from the LRU, which
 * could be as far down as __page_cache_release.
 */
static inline int page_is_file_cache(struct page *page)
{
	return !PageSwapBacked(page);
}

static inline void
add_page_to_lru_list(struct zone *zone, struct page *page, enum lru_list lru)
{
	struct lruvec *lruvec;

	lruvec = mem_cgroup_lru_add_list(zone, page, lru);
	list_add(&page->lru, &lruvec->lists[lru]);
	__mod_zone_page_state(zone, NR_LRU_BASE + lru, hpage_nr_pages(page));
}

static inline void
del_page_from_lru_list(struct zone *zone, struct page *page, enum lru_list lru)
{
	mem_cgroup_lru_del_list(page, lru);
	list_del(&page->lru);
	__mod_zone_page_state(zone, NR_LRU_BASE + lru, -hpage_nr_pages(page));
}

/**
 * page_lru_base_type - which LRU list type should a page be on?
 * @page: the page to test
 *
 * Used for LRU list index arithmetic.
 *
 * Returns the base LRU type - file or anon - @page should be on.
 */
static inline enum lru_list page_lru_base_type(struct page *page)
{
	if (page_is_file_cache(page))
		return LRU_INACTIVE_FILE;
	return LRU_INACTIVE_ANON;
}

/**
 * page_off_lru - which LRU list was page on? clearing its lru flags.
 * @page: the page to test
 *
 * Returns the LRU list a page was on, as an index into the array of LRU
 * lists; and clears its Unevictable or Active flags, ready for freeing.
 */
static inline enum lru_list page_off_lru(struct page *page)
{
	enum lru_list lru;

	if (PageUnevictable(page)) {
		__ClearPageUnevictable(page);
		lru = LRU_UNEVICTABLE;
	} else {
		lru = page_lru_base_type(page);
		if (PageActive(page)) {
			__ClearPageActive(page);
			lru += LRU_ACTIVE;
		}
	}
	return lru;
}

/**
 * page_lru - which LRU list should a page be on?
 * @page: the page to test
 *
 * Returns the LRU list a page should be on, as an index
 * into the array of LRU lists.
 */
static inline enum lru_list page_lru(struct page *page)
{
	enum lru_list lru;

	if (PageUnevictable(page))
		lru = LRU_UNEVICTABLE;
	else {
		lru = page_lru_base_type(page);
		if (PageActive(page))
			lru += LRU_ACTIVE;
	}
	return lru;
}

#endif