Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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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#include <linux/swap.h>
6
7/**
8 * page_is_file_cache - should the page be on a file LRU or anon LRU?
9 * @page: the page to test
10 *
11 * Returns 1 if @page is page cache page backed by a regular filesystem,
12 * or 0 if @page is anonymous, tmpfs or otherwise ram or swap backed.
13 * Used by functions that manipulate the LRU lists, to sort a page
14 * onto the right LRU list.
15 *
16 * We would like to get this info without a page flag, but the state
17 * needs to survive until the page is last deleted from the LRU, which
18 * could be as far down as __page_cache_release.
19 */
20static inline int page_is_file_cache(struct page *page)
21{
22 return !PageSwapBacked(page);
23}
24
25static __always_inline void __update_lru_size(struct lruvec *lruvec,
26 enum lru_list lru, enum zone_type zid,
27 int nr_pages)
28{
29 struct pglist_data *pgdat = lruvec_pgdat(lruvec);
30
31 __mod_node_page_state(pgdat, NR_LRU_BASE + lru, nr_pages);
32 __mod_zone_page_state(&pgdat->node_zones[zid],
33 NR_ZONE_LRU_BASE + lru, nr_pages);
34}
35
36static __always_inline void update_lru_size(struct lruvec *lruvec,
37 enum lru_list lru, enum zone_type zid,
38 int nr_pages)
39{
40 __update_lru_size(lruvec, lru, zid, nr_pages);
41#ifdef CONFIG_MEMCG
42 mem_cgroup_update_lru_size(lruvec, lru, zid, nr_pages);
43#endif
44}
45
46static __always_inline void add_page_to_lru_list(struct page *page,
47 struct lruvec *lruvec, enum lru_list lru)
48{
49 update_lru_size(lruvec, lru, page_zonenum(page), hpage_nr_pages(page));
50 list_add(&page->lru, &lruvec->lists[lru]);
51}
52
53static __always_inline void del_page_from_lru_list(struct page *page,
54 struct lruvec *lruvec, enum lru_list lru)
55{
56 list_del(&page->lru);
57 update_lru_size(lruvec, lru, page_zonenum(page), -hpage_nr_pages(page));
58}
59
60/**
61 * page_lru_base_type - which LRU list type should a page be on?
62 * @page: the page to test
63 *
64 * Used for LRU list index arithmetic.
65 *
66 * Returns the base LRU type - file or anon - @page should be on.
67 */
68static inline enum lru_list page_lru_base_type(struct page *page)
69{
70 if (page_is_file_cache(page))
71 return LRU_INACTIVE_FILE;
72 return LRU_INACTIVE_ANON;
73}
74
75/**
76 * page_off_lru - which LRU list was page on? clearing its lru flags.
77 * @page: the page to test
78 *
79 * Returns the LRU list a page was on, as an index into the array of LRU
80 * lists; and clears its Unevictable or Active flags, ready for freeing.
81 */
82static __always_inline enum lru_list page_off_lru(struct page *page)
83{
84 enum lru_list lru;
85
86 if (PageUnevictable(page)) {
87 __ClearPageUnevictable(page);
88 lru = LRU_UNEVICTABLE;
89 } else {
90 lru = page_lru_base_type(page);
91 if (PageActive(page)) {
92 __ClearPageActive(page);
93 lru += LRU_ACTIVE;
94 }
95 }
96 return lru;
97}
98
99/**
100 * page_lru - which LRU list should a page be on?
101 * @page: the page to test
102 *
103 * Returns the LRU list a page should be on, as an index
104 * into the array of LRU lists.
105 */
106static __always_inline enum lru_list page_lru(struct page *page)
107{
108 enum lru_list lru;
109
110 if (PageUnevictable(page))
111 lru = LRU_UNEVICTABLE;
112 else {
113 lru = page_lru_base_type(page);
114 if (PageActive(page))
115 lru += LRU_ACTIVE;
116 }
117 return lru;
118}
119
120#define lru_to_page(head) (list_entry((head)->prev, struct page, lru))
121
122#endif