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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 | |
742755a1 | 8 | typedef struct page *new_page_t(struct page *, unsigned long private, int **); |
95a402c3 | 9 | |
78bd5209 RA |
10 | /* |
11 | * Return values from addresss_space_operations.migratepage(): | |
12 | * - negative errno on page migration failure; | |
13 | * - zero on page migration success; | |
18468d93 RA |
14 | * |
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. | |
78bd5209 RA |
21 | */ |
22 | #define MIGRATEPAGE_SUCCESS 0 | |
18468d93 RA |
23 | #define MIGRATEPAGE_BALLOON_SUCCESS 1 /* special ret code for balloon page |
24 | * sucessful migration case. | |
25 | */ | |
7b2a2d4a MG |
26 | enum migrate_reason { |
27 | MR_COMPACTION, | |
28 | MR_MEMORY_FAILURE, | |
29 | MR_MEMORY_HOTPLUG, | |
30 | MR_SYSCALL, /* also applies to cpusets */ | |
31 | MR_MEMPOLICY_MBIND, | |
7039e1db | 32 | MR_NUMA_MISPLACED, |
7b2a2d4a MG |
33 | MR_CMA |
34 | }; | |
78bd5209 | 35 | |
906e0be1 | 36 | #ifdef CONFIG_MIGRATION |
64cdd548 | 37 | |
e13861d8 | 38 | extern void putback_lru_pages(struct list_head *l); |
5733c7d1 | 39 | extern void putback_movable_pages(struct list_head *l); |
2d1db3b1 | 40 | extern int migrate_page(struct address_space *, |
a6bc32b8 | 41 | struct page *, struct page *, enum migrate_mode); |
62b61f61 | 42 | extern int migrate_pages(struct list_head *l, new_page_t x, |
7f0f2496 | 43 | unsigned long private, bool offlining, |
7b2a2d4a | 44 | enum migrate_mode mode, int reason); |
189ebff2 | 45 | extern int migrate_huge_page(struct page *, new_page_t x, |
7f0f2496 | 46 | unsigned long private, bool offlining, |
a6bc32b8 | 47 | enum migrate_mode mode); |
95a402c3 | 48 | |
2d1db3b1 CL |
49 | extern int fail_migrate_page(struct address_space *, |
50 | struct page *, struct page *); | |
b20a3503 CL |
51 | |
52 | extern int migrate_prep(void); | |
748446bb | 53 | extern int migrate_prep_local(void); |
7b2259b3 CL |
54 | extern int migrate_vmas(struct mm_struct *mm, |
55 | const nodemask_t *from, const nodemask_t *to, | |
56 | unsigned long flags); | |
290408d4 NH |
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); | |
b20a3503 | 60 | #else |
64cdd548 | 61 | |
e13861d8 | 62 | static inline void putback_lru_pages(struct list_head *l) {} |
5733c7d1 | 63 | static inline void putback_movable_pages(struct list_head *l) {} |
95a402c3 | 64 | static inline int migrate_pages(struct list_head *l, new_page_t x, |
7f0f2496 | 65 | unsigned long private, bool offlining, |
7b2a2d4a | 66 | enum migrate_mode mode, int reason) { return -ENOSYS; } |
189ebff2 | 67 | static inline int migrate_huge_page(struct page *page, new_page_t x, |
7f0f2496 | 68 | unsigned long private, bool offlining, |
a6bc32b8 | 69 | enum migrate_mode mode) { return -ENOSYS; } |
9bf9e89c | 70 | |
b20a3503 | 71 | static inline int migrate_prep(void) { return -ENOSYS; } |
748446bb | 72 | static inline int migrate_prep_local(void) { return -ENOSYS; } |
b20a3503 | 73 | |
7b2259b3 CL |
74 | static inline int migrate_vmas(struct mm_struct *mm, |
75 | const nodemask_t *from, const nodemask_t *to, | |
76 | unsigned long flags) | |
77 | { | |
78 | return -ENOSYS; | |
79 | } | |
80 | ||
290408d4 NH |
81 | static inline void migrate_page_copy(struct page *newpage, |
82 | struct page *page) {} | |
83 | ||
6f39ce05 | 84 | static inline int migrate_huge_page_move_mapping(struct address_space *mapping, |
290408d4 NH |
85 | struct page *newpage, struct page *page) |
86 | { | |
87 | return -ENOSYS; | |
88 | } | |
89 | ||
b20a3503 CL |
90 | /* Possible settings for the migrate_page() method in address_operations */ |
91 | #define migrate_page NULL | |
92 | #define fail_migrate_page NULL | |
93 | ||
94 | #endif /* CONFIG_MIGRATION */ | |
7039e1db PZ |
95 | |
96 | #ifdef CONFIG_NUMA_BALANCING | |
97 | extern int migrate_misplaced_page(struct page *page, int node); | |
e14808b4 MG |
98 | extern int migrate_misplaced_page(struct page *page, int node); |
99 | extern bool migrate_ratelimited(int node); | |
7039e1db PZ |
100 | #else |
101 | static inline int migrate_misplaced_page(struct page *page, int node) | |
102 | { | |
103 | return -EAGAIN; /* can't migrate now */ | |
104 | } | |
e14808b4 MG |
105 | static inline bool migrate_ratelimited(int node) |
106 | { | |
107 | return false; | |
108 | } | |
220018d3 | 109 | #endif /* CONFIG_NUMA_BALANCING */ |
b32967ff | 110 | |
220018d3 MG |
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); | |
117 | #else | |
b32967ff MG |
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) | |
123 | { | |
124 | return -EAGAIN; | |
125 | } | |
220018d3 | 126 | #endif /* CONFIG_NUMA_BALANCING && CONFIG_TRANSPARENT_HUGEPAGE*/ |
7039e1db | 127 | |
b20a3503 | 128 | #endif /* _LINUX_MIGRATE_H */ |