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b20a3503 CL |
1 | #ifndef _LINUX_MIGRATE_H |
2 | #define _LINUX_MIGRATE_H | |
3 | ||
b20a3503 | 4 | #include <linux/mm.h> |
906e0be1 | 5 | #include <linux/mempolicy.h> |
6536e312 | 6 | #include <linux/migrate_mode.h> |
b20a3503 | 7 | |
68711a74 DR |
8 | typedef struct page *new_page_t(struct page *page, unsigned long private, |
9 | int **reason); | |
10 | typedef void free_page_t(struct page *page, unsigned long private); | |
95a402c3 | 11 | |
78bd5209 RA |
12 | /* |
13 | * Return values from addresss_space_operations.migratepage(): | |
14 | * - negative errno on page migration failure; | |
15 | * - zero on page migration success; | |
16 | */ | |
17 | #define MIGRATEPAGE_SUCCESS 0 | |
d6d86c0a | 18 | |
7b2a2d4a MG |
19 | enum migrate_reason { |
20 | MR_COMPACTION, | |
21 | MR_MEMORY_FAILURE, | |
22 | MR_MEMORY_HOTPLUG, | |
23 | MR_SYSCALL, /* also applies to cpusets */ | |
24 | MR_MEMPOLICY_MBIND, | |
7039e1db | 25 | MR_NUMA_MISPLACED, |
7b2a2d4a MG |
26 | MR_CMA |
27 | }; | |
78bd5209 | 28 | |
906e0be1 | 29 | #ifdef CONFIG_MIGRATION |
64cdd548 | 30 | |
5733c7d1 | 31 | extern void putback_movable_pages(struct list_head *l); |
2d1db3b1 | 32 | extern int migrate_page(struct address_space *, |
a6bc32b8 | 33 | struct page *, struct page *, enum migrate_mode); |
68711a74 | 34 | extern int migrate_pages(struct list_head *l, new_page_t new, free_page_t free, |
9c620e2b | 35 | unsigned long private, enum migrate_mode mode, int reason); |
95a402c3 | 36 | |
b20a3503 | 37 | extern int migrate_prep(void); |
748446bb | 38 | extern int migrate_prep_local(void); |
290408d4 NH |
39 | extern void migrate_page_copy(struct page *newpage, struct page *page); |
40 | extern int migrate_huge_page_move_mapping(struct address_space *mapping, | |
41 | struct page *newpage, struct page *page); | |
36bc08cc GZ |
42 | extern int migrate_page_move_mapping(struct address_space *mapping, |
43 | struct page *newpage, struct page *page, | |
8e321fef BL |
44 | struct buffer_head *head, enum migrate_mode mode, |
45 | int extra_count); | |
b20a3503 | 46 | #else |
64cdd548 | 47 | |
5733c7d1 | 48 | static inline void putback_movable_pages(struct list_head *l) {} |
68711a74 DR |
49 | static inline int migrate_pages(struct list_head *l, new_page_t new, |
50 | free_page_t free, unsigned long private, enum migrate_mode mode, | |
51 | int reason) | |
9c620e2b | 52 | { return -ENOSYS; } |
9bf9e89c | 53 | |
b20a3503 | 54 | static inline int migrate_prep(void) { return -ENOSYS; } |
748446bb | 55 | static inline int migrate_prep_local(void) { return -ENOSYS; } |
b20a3503 | 56 | |
290408d4 NH |
57 | static inline void migrate_page_copy(struct page *newpage, |
58 | struct page *page) {} | |
59 | ||
6f39ce05 | 60 | static inline int migrate_huge_page_move_mapping(struct address_space *mapping, |
290408d4 NH |
61 | struct page *newpage, struct page *page) |
62 | { | |
63 | return -ENOSYS; | |
64 | } | |
65 | ||
b20a3503 | 66 | #endif /* CONFIG_MIGRATION */ |
7039e1db PZ |
67 | |
68 | #ifdef CONFIG_NUMA_BALANCING | |
de466bd6 | 69 | extern bool pmd_trans_migrating(pmd_t pmd); |
1bc115d8 MG |
70 | extern int migrate_misplaced_page(struct page *page, |
71 | struct vm_area_struct *vma, int node); | |
7039e1db | 72 | #else |
de466bd6 MG |
73 | static inline bool pmd_trans_migrating(pmd_t pmd) |
74 | { | |
75 | return false; | |
76 | } | |
1bc115d8 MG |
77 | static inline int migrate_misplaced_page(struct page *page, |
78 | struct vm_area_struct *vma, int node) | |
7039e1db PZ |
79 | { |
80 | return -EAGAIN; /* can't migrate now */ | |
81 | } | |
220018d3 | 82 | #endif /* CONFIG_NUMA_BALANCING */ |
b32967ff | 83 | |
220018d3 MG |
84 | #if defined(CONFIG_NUMA_BALANCING) && defined(CONFIG_TRANSPARENT_HUGEPAGE) |
85 | extern int migrate_misplaced_transhuge_page(struct mm_struct *mm, | |
86 | struct vm_area_struct *vma, | |
87 | pmd_t *pmd, pmd_t entry, | |
88 | unsigned long address, | |
89 | struct page *page, int node); | |
90 | #else | |
b32967ff MG |
91 | static inline int migrate_misplaced_transhuge_page(struct mm_struct *mm, |
92 | struct vm_area_struct *vma, | |
93 | pmd_t *pmd, pmd_t entry, | |
94 | unsigned long address, | |
95 | struct page *page, int node) | |
96 | { | |
97 | return -EAGAIN; | |
98 | } | |
220018d3 | 99 | #endif /* CONFIG_NUMA_BALANCING && CONFIG_TRANSPARENT_HUGEPAGE*/ |
7039e1db | 100 | |
b20a3503 | 101 | #endif /* _LINUX_MIGRATE_H */ |