1 #ifndef LINUX_MM_INLINE_H
2 #define LINUX_MM_INLINE_H
4 #include <linux/huge_mm.h>
7 * page_is_file_cache - should the page be on a file LRU or anon LRU?
8 * @page: the page to test
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.
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.
19 static inline int page_is_file_cache(struct page
*page
)
21 return !PageSwapBacked(page
);
24 static __always_inline
void add_page_to_lru_list(struct page
*page
,
25 struct lruvec
*lruvec
, enum lru_list lru
)
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
);
33 static __always_inline
void del_page_from_lru_list(struct page
*page
,
34 struct lruvec
*lruvec
, enum lru_list lru
)
36 int nr_pages
= hpage_nr_pages(page
);
37 mem_cgroup_update_lru_size(lruvec
, lru
, -nr_pages
);
39 __mod_zone_page_state(lruvec_zone(lruvec
), NR_LRU_BASE
+ lru
, -nr_pages
);
43 * page_lru_base_type - which LRU list type should a page be on?
44 * @page: the page to test
46 * Used for LRU list index arithmetic.
48 * Returns the base LRU type - file or anon - @page should be on.
50 static inline enum lru_list
page_lru_base_type(struct page
*page
)
52 if (page_is_file_cache(page
))
53 return LRU_INACTIVE_FILE
;
54 return LRU_INACTIVE_ANON
;
58 * page_off_lru - which LRU list was page on? clearing its lru flags.
59 * @page: the page to test
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.
64 static __always_inline
enum lru_list
page_off_lru(struct page
*page
)
68 if (PageUnevictable(page
)) {
69 __ClearPageUnevictable(page
);
70 lru
= LRU_UNEVICTABLE
;
72 lru
= page_lru_base_type(page
);
73 if (PageActive(page
)) {
74 __ClearPageActive(page
);
82 * page_lru - which LRU list should a page be on?
83 * @page: the page to test
85 * Returns the LRU list a page should be on, as an index
86 * into the array of LRU lists.
88 static __always_inline
enum lru_list
page_lru(struct page
*page
)
92 if (PageUnevictable(page
))
93 lru
= LRU_UNEVICTABLE
;
95 lru
= page_lru_base_type(page
);
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