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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, |
7cd12b4a VB |
26 | MR_CMA, |
27 | MR_TYPES | |
7b2a2d4a | 28 | }; |
78bd5209 | 29 | |
7cd12b4a VB |
30 | /* In mm/debug.c; also keep sync with include/trace/events/migrate.h */ |
31 | extern char *migrate_reason_names[MR_TYPES]; | |
32 | ||
906e0be1 | 33 | #ifdef CONFIG_MIGRATION |
64cdd548 | 34 | |
5733c7d1 | 35 | extern void putback_movable_pages(struct list_head *l); |
2d1db3b1 | 36 | extern int migrate_page(struct address_space *, |
a6bc32b8 | 37 | struct page *, struct page *, enum migrate_mode); |
68711a74 | 38 | extern int migrate_pages(struct list_head *l, new_page_t new, free_page_t free, |
9c620e2b | 39 | unsigned long private, enum migrate_mode mode, int reason); |
bda807d4 MK |
40 | extern bool isolate_movable_page(struct page *page, isolate_mode_t mode); |
41 | extern void putback_movable_page(struct page *page); | |
95a402c3 | 42 | |
b20a3503 | 43 | extern int migrate_prep(void); |
748446bb | 44 | extern int migrate_prep_local(void); |
290408d4 NH |
45 | extern void migrate_page_copy(struct page *newpage, struct page *page); |
46 | extern int migrate_huge_page_move_mapping(struct address_space *mapping, | |
47 | struct page *newpage, struct page *page); | |
36bc08cc GZ |
48 | extern int migrate_page_move_mapping(struct address_space *mapping, |
49 | struct page *newpage, struct page *page, | |
8e321fef BL |
50 | struct buffer_head *head, enum migrate_mode mode, |
51 | int extra_count); | |
b20a3503 | 52 | #else |
64cdd548 | 53 | |
5733c7d1 | 54 | static inline void putback_movable_pages(struct list_head *l) {} |
68711a74 DR |
55 | static inline int migrate_pages(struct list_head *l, new_page_t new, |
56 | free_page_t free, unsigned long private, enum migrate_mode mode, | |
57 | int reason) | |
9c620e2b | 58 | { return -ENOSYS; } |
9bf9e89c | 59 | |
b20a3503 | 60 | static inline int migrate_prep(void) { return -ENOSYS; } |
748446bb | 61 | static inline int migrate_prep_local(void) { return -ENOSYS; } |
b20a3503 | 62 | |
290408d4 NH |
63 | static inline void migrate_page_copy(struct page *newpage, |
64 | struct page *page) {} | |
65 | ||
6f39ce05 | 66 | static inline int migrate_huge_page_move_mapping(struct address_space *mapping, |
290408d4 NH |
67 | struct page *newpage, struct page *page) |
68 | { | |
69 | return -ENOSYS; | |
70 | } | |
71 | ||
b20a3503 | 72 | #endif /* CONFIG_MIGRATION */ |
7039e1db | 73 | |
dd4123f3 MK |
74 | #ifdef CONFIG_COMPACTION |
75 | extern int PageMovable(struct page *page); | |
76 | extern void __SetPageMovable(struct page *page, struct address_space *mapping); | |
77 | extern void __ClearPageMovable(struct page *page); | |
78 | #else | |
79 | static inline int PageMovable(struct page *page) { return 0; }; | |
80 | static inline void __SetPageMovable(struct page *page, | |
81 | struct address_space *mapping) | |
82 | { | |
83 | } | |
84 | static inline void __ClearPageMovable(struct page *page) | |
85 | { | |
86 | } | |
87 | #endif | |
88 | ||
7039e1db | 89 | #ifdef CONFIG_NUMA_BALANCING |
de466bd6 | 90 | extern bool pmd_trans_migrating(pmd_t pmd); |
1bc115d8 MG |
91 | extern int migrate_misplaced_page(struct page *page, |
92 | struct vm_area_struct *vma, int node); | |
7039e1db | 93 | #else |
de466bd6 MG |
94 | static inline bool pmd_trans_migrating(pmd_t pmd) |
95 | { | |
96 | return false; | |
97 | } | |
1bc115d8 MG |
98 | static inline int migrate_misplaced_page(struct page *page, |
99 | struct vm_area_struct *vma, int node) | |
7039e1db PZ |
100 | { |
101 | return -EAGAIN; /* can't migrate now */ | |
102 | } | |
220018d3 | 103 | #endif /* CONFIG_NUMA_BALANCING */ |
b32967ff | 104 | |
220018d3 MG |
105 | #if defined(CONFIG_NUMA_BALANCING) && defined(CONFIG_TRANSPARENT_HUGEPAGE) |
106 | extern int migrate_misplaced_transhuge_page(struct mm_struct *mm, | |
107 | struct vm_area_struct *vma, | |
108 | pmd_t *pmd, pmd_t entry, | |
109 | unsigned long address, | |
110 | struct page *page, int node); | |
111 | #else | |
b32967ff MG |
112 | static inline 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) | |
117 | { | |
118 | return -EAGAIN; | |
119 | } | |
220018d3 | 120 | #endif /* CONFIG_NUMA_BALANCING && CONFIG_TRANSPARENT_HUGEPAGE*/ |
7039e1db | 121 | |
b20a3503 | 122 | #endif /* _LINUX_MIGRATE_H */ |