1 #ifndef _LINUX_MIGRATE_H
2 #define _LINUX_MIGRATE_H
5 #include <linux/mempolicy.h>
6 #include <linux/migrate_mode.h>
8 typedef struct page
*new_page_t(struct page
*, unsigned long private, int **);
11 * Return values from addresss_space_operations.migratepage():
12 * - negative errno on page migration failure;
13 * - zero on page migration success;
15 * The balloon page migration introduces this special case where a 'distinct'
16 * return code is used to flag a successful page migration to unmap_and_move().
17 * This approach is necessary because page migration can race against balloon
18 * deflation procedure, and for such case we could introduce a nasty page leak
19 * if a successfully migrated balloon page gets released concurrently with
20 * migration's unmap_and_move() wrap-up steps.
22 #define MIGRATEPAGE_SUCCESS 0
23 #define MIGRATEPAGE_BALLOON_SUCCESS 1 /* special ret code for balloon page
24 * sucessful migration case.
27 #ifdef CONFIG_MIGRATION
29 extern void putback_lru_pages(struct list_head
*l
);
30 extern void putback_movable_pages(struct list_head
*l
);
31 extern int migrate_page(struct address_space
*,
32 struct page
*, struct page
*, enum migrate_mode
);
33 extern int migrate_pages(struct list_head
*l
, new_page_t x
,
34 unsigned long private, bool offlining
,
35 enum migrate_mode mode
);
36 extern int migrate_huge_page(struct page
*, new_page_t x
,
37 unsigned long private, bool offlining
,
38 enum migrate_mode mode
);
40 extern int fail_migrate_page(struct address_space
*,
41 struct page
*, struct page
*);
43 extern int migrate_prep(void);
44 extern int migrate_prep_local(void);
45 extern int migrate_vmas(struct mm_struct
*mm
,
46 const nodemask_t
*from
, const nodemask_t
*to
,
48 extern void migrate_page_copy(struct page
*newpage
, struct page
*page
);
49 extern int migrate_huge_page_move_mapping(struct address_space
*mapping
,
50 struct page
*newpage
, struct page
*page
);
53 static inline void putback_lru_pages(struct list_head
*l
) {}
54 static inline void putback_movable_pages(struct list_head
*l
) {}
55 static inline int migrate_pages(struct list_head
*l
, new_page_t x
,
56 unsigned long private, bool offlining
,
57 enum migrate_mode mode
) { return -ENOSYS
; }
58 static inline int migrate_huge_page(struct page
*page
, new_page_t x
,
59 unsigned long private, bool offlining
,
60 enum migrate_mode mode
) { return -ENOSYS
; }
62 static inline int migrate_prep(void) { return -ENOSYS
; }
63 static inline int migrate_prep_local(void) { return -ENOSYS
; }
65 static inline int migrate_vmas(struct mm_struct
*mm
,
66 const nodemask_t
*from
, const nodemask_t
*to
,
72 static inline void migrate_page_copy(struct page
*newpage
,
75 static inline int migrate_huge_page_move_mapping(struct address_space
*mapping
,
76 struct page
*newpage
, struct page
*page
)
81 /* Possible settings for the migrate_page() method in address_operations */
82 #define migrate_page NULL
83 #define fail_migrate_page NULL
85 #endif /* CONFIG_MIGRATION */
86 #endif /* _LINUX_MIGRATE_H */
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