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.
30 MR_SYSCALL
, /* also applies to cpusets */
36 #ifdef CONFIG_MIGRATION
38 extern void putback_lru_pages(struct list_head
*l
);
39 extern void putback_movable_pages(struct list_head
*l
);
40 extern int migrate_page(struct address_space
*,
41 struct page
*, struct page
*, enum migrate_mode
);
42 extern int migrate_pages(struct list_head
*l
, new_page_t x
,
43 unsigned long private, bool offlining
,
44 enum migrate_mode mode
, int reason
);
45 extern int migrate_huge_page(struct page
*, new_page_t x
,
46 unsigned long private, bool offlining
,
47 enum migrate_mode mode
);
49 extern int fail_migrate_page(struct address_space
*,
50 struct page
*, struct page
*);
52 extern int migrate_prep(void);
53 extern int migrate_prep_local(void);
54 extern int migrate_vmas(struct mm_struct
*mm
,
55 const nodemask_t
*from
, const nodemask_t
*to
,
57 extern void migrate_page_copy(struct page
*newpage
, struct page
*page
);
58 extern int migrate_huge_page_move_mapping(struct address_space
*mapping
,
59 struct page
*newpage
, struct page
*page
);
62 static inline void putback_lru_pages(struct list_head
*l
) {}
63 static inline void putback_movable_pages(struct list_head
*l
) {}
64 static inline int migrate_pages(struct list_head
*l
, new_page_t x
,
65 unsigned long private, bool offlining
,
66 enum migrate_mode mode
, int reason
) { return -ENOSYS
; }
67 static inline int migrate_huge_page(struct page
*page
, new_page_t x
,
68 unsigned long private, bool offlining
,
69 enum migrate_mode mode
) { return -ENOSYS
; }
71 static inline int migrate_prep(void) { return -ENOSYS
; }
72 static inline int migrate_prep_local(void) { return -ENOSYS
; }
74 static inline int migrate_vmas(struct mm_struct
*mm
,
75 const nodemask_t
*from
, const nodemask_t
*to
,
81 static inline void migrate_page_copy(struct page
*newpage
,
84 static inline int migrate_huge_page_move_mapping(struct address_space
*mapping
,
85 struct page
*newpage
, struct page
*page
)
90 /* Possible settings for the migrate_page() method in address_operations */
91 #define migrate_page NULL
92 #define fail_migrate_page NULL
94 #endif /* CONFIG_MIGRATION */
96 #ifdef CONFIG_NUMA_BALANCING
97 extern int migrate_misplaced_page(struct page
*page
, int node
);
98 extern int migrate_misplaced_page(struct page
*page
, int node
);
99 extern bool migrate_ratelimited(int node
);
101 static inline int migrate_misplaced_page(struct page
*page
, int node
)
103 return -EAGAIN
; /* can't migrate now */
105 static inline bool migrate_ratelimited(int node
)
109 #endif /* CONFIG_NUMA_BALANCING */
111 #if defined(CONFIG_NUMA_BALANCING) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
112 extern int migrate_misplaced_transhuge_page(struct mm_struct
*mm
,
113 struct vm_area_struct
*vma
,
114 pmd_t
*pmd
, pmd_t entry
,
115 unsigned long address
,
116 struct page
*page
, int node
);
118 static inline int migrate_misplaced_transhuge_page(struct mm_struct
*mm
,
119 struct vm_area_struct
*vma
,
120 pmd_t
*pmd
, pmd_t entry
,
121 unsigned long address
,
122 struct page
*page
, int node
)
126 #endif /* CONFIG_NUMA_BALANCING && CONFIG_TRANSPARENT_HUGEPAGE*/
128 #endif /* _LINUX_MIGRATE_H */
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