1 #ifndef LINUX_MM_INLINE_H
2 #define LINUX_MM_INLINE_H
4 #include <linux/huge_mm.h>
5 #include <linux/swap.h>
8 * page_is_file_cache - should the page be on a file LRU or anon LRU?
9 * @page: the page to test
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.
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.
20 static inline int page_is_file_cache(struct page
*page
)
22 return !PageSwapBacked(page
);
25 static __always_inline
void __update_lru_size(struct lruvec
*lruvec
,
26 enum lru_list lru
, int nr_pages
)
28 __mod_zone_page_state(lruvec_zone(lruvec
), NR_LRU_BASE
+ lru
, nr_pages
);
31 static __always_inline
void update_lru_size(struct lruvec
*lruvec
,
32 enum lru_list lru
, int nr_pages
)
35 mem_cgroup_update_lru_size(lruvec
, lru
, nr_pages
);
37 __update_lru_size(lruvec
, lru
, nr_pages
);
41 static __always_inline
void add_page_to_lru_list(struct page
*page
,
42 struct lruvec
*lruvec
, enum lru_list lru
)
44 update_lru_size(lruvec
, lru
, hpage_nr_pages(page
));
45 list_add(&page
->lru
, &lruvec
->lists
[lru
]);
48 static __always_inline
void del_page_from_lru_list(struct page
*page
,
49 struct lruvec
*lruvec
, enum lru_list lru
)
52 update_lru_size(lruvec
, lru
, -hpage_nr_pages(page
));
56 * page_lru_base_type - which LRU list type should a page be on?
57 * @page: the page to test
59 * Used for LRU list index arithmetic.
61 * Returns the base LRU type - file or anon - @page should be on.
63 static inline enum lru_list
page_lru_base_type(struct page
*page
)
65 if (page_is_file_cache(page
))
66 return LRU_INACTIVE_FILE
;
67 return LRU_INACTIVE_ANON
;
71 * page_off_lru - which LRU list was page on? clearing its lru flags.
72 * @page: the page to test
74 * Returns the LRU list a page was on, as an index into the array of LRU
75 * lists; and clears its Unevictable or Active flags, ready for freeing.
77 static __always_inline
enum lru_list
page_off_lru(struct page
*page
)
81 if (PageUnevictable(page
)) {
82 __ClearPageUnevictable(page
);
83 lru
= LRU_UNEVICTABLE
;
85 lru
= page_lru_base_type(page
);
86 if (PageActive(page
)) {
87 __ClearPageActive(page
);
95 * page_lru - which LRU list should a page be on?
96 * @page: the page to test
98 * Returns the LRU list a page should be on, as an index
99 * into the array of LRU lists.
101 static __always_inline
enum lru_list
page_lru(struct page
*page
)
105 if (PageUnevictable(page
))
106 lru
= LRU_UNEVICTABLE
;
108 lru
= page_lru_base_type(page
);
109 if (PageActive(page
))
115 #define lru_to_page(head) (list_entry((head)->prev, struct page, lru))
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