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
, enum zone_type zid
,
29 struct pglist_data
*pgdat
= lruvec_pgdat(lruvec
);
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
);
36 static __always_inline
void update_lru_size(struct lruvec
*lruvec
,
37 enum lru_list lru
, enum zone_type zid
,
40 __update_lru_size(lruvec
, lru
, zid
, nr_pages
);
42 mem_cgroup_update_lru_size(lruvec
, lru
, nr_pages
);
46 static __always_inline
void add_page_to_lru_list(struct page
*page
,
47 struct lruvec
*lruvec
, enum lru_list lru
)
49 update_lru_size(lruvec
, lru
, page_zonenum(page
), hpage_nr_pages(page
));
50 list_add(&page
->lru
, &lruvec
->lists
[lru
]);
53 static __always_inline
void del_page_from_lru_list(struct page
*page
,
54 struct lruvec
*lruvec
, enum lru_list lru
)
57 update_lru_size(lruvec
, lru
, page_zonenum(page
), -hpage_nr_pages(page
));
61 * page_lru_base_type - which LRU list type should a page be on?
62 * @page: the page to test
64 * Used for LRU list index arithmetic.
66 * Returns the base LRU type - file or anon - @page should be on.
68 static inline enum lru_list
page_lru_base_type(struct page
*page
)
70 if (page_is_file_cache(page
))
71 return LRU_INACTIVE_FILE
;
72 return LRU_INACTIVE_ANON
;
76 * page_off_lru - which LRU list was page on? clearing its lru flags.
77 * @page: the page to test
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.
82 static __always_inline
enum lru_list
page_off_lru(struct page
*page
)
86 if (PageUnevictable(page
)) {
87 __ClearPageUnevictable(page
);
88 lru
= LRU_UNEVICTABLE
;
90 lru
= page_lru_base_type(page
);
91 if (PageActive(page
)) {
92 __ClearPageActive(page
);
100 * page_lru - which LRU list should a page be on?
101 * @page: the page to test
103 * Returns the LRU list a page should be on, as an index
104 * into the array of LRU lists.
106 static __always_inline
enum lru_list
page_lru(struct page
*page
)
110 if (PageUnevictable(page
))
111 lru
= LRU_UNEVICTABLE
;
113 lru
= page_lru_base_type(page
);
114 if (PageActive(page
))
120 #define lru_to_page(head) (list_entry((head)->prev, struct page, lru))
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