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1 | #ifndef _LINUX_MIGRATE_H | |
2 | #define _LINUX_MIGRATE_H | |
3 | ||
4 | #include <linux/mm.h> | |
5 | #include <linux/mempolicy.h> | |
6 | #include <linux/migrate_mode.h> | |
7 | ||
8 | typedef struct page *new_page_t(struct page *, unsigned long private, int **); | |
9 | ||
10 | /* | |
11 | * Return values from addresss_space_operations.migratepage(): | |
12 | * - negative errno on page migration failure; | |
13 | * - zero on page migration success; | |
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. | |
21 | */ | |
22 | #define MIGRATEPAGE_SUCCESS 0 | |
23 | #define MIGRATEPAGE_BALLOON_SUCCESS 1 /* special ret code for balloon page | |
24 | * sucessful migration case. | |
25 | */ | |
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, | |
32 | MR_NUMA_MISPLACED, | |
33 | MR_CMA | |
34 | }; | |
35 | ||
36 | #ifdef CONFIG_MIGRATION | |
37 | ||
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, enum migrate_mode mode, int reason); | |
44 | extern int migrate_huge_page(struct page *, new_page_t x, | |
45 | unsigned long private, enum migrate_mode mode); | |
46 | ||
47 | extern int fail_migrate_page(struct address_space *, | |
48 | struct page *, struct page *); | |
49 | ||
50 | extern int migrate_prep(void); | |
51 | extern int migrate_prep_local(void); | |
52 | extern int migrate_vmas(struct mm_struct *mm, | |
53 | const nodemask_t *from, const nodemask_t *to, | |
54 | unsigned long flags); | |
55 | extern void migrate_page_copy(struct page *newpage, struct page *page); | |
56 | extern int migrate_huge_page_move_mapping(struct address_space *mapping, | |
57 | struct page *newpage, struct page *page); | |
58 | #else | |
59 | ||
60 | static inline void putback_lru_pages(struct list_head *l) {} | |
61 | static inline void putback_movable_pages(struct list_head *l) {} | |
62 | static inline int migrate_pages(struct list_head *l, new_page_t x, | |
63 | unsigned long private, enum migrate_mode mode, int reason) | |
64 | { return -ENOSYS; } | |
65 | static inline int migrate_huge_page(struct page *page, new_page_t x, | |
66 | unsigned long private, enum migrate_mode mode) | |
67 | { return -ENOSYS; } | |
68 | ||
69 | static inline int migrate_prep(void) { return -ENOSYS; } | |
70 | static inline int migrate_prep_local(void) { return -ENOSYS; } | |
71 | ||
72 | static inline int migrate_vmas(struct mm_struct *mm, | |
73 | const nodemask_t *from, const nodemask_t *to, | |
74 | unsigned long flags) | |
75 | { | |
76 | return -ENOSYS; | |
77 | } | |
78 | ||
79 | static inline void migrate_page_copy(struct page *newpage, | |
80 | struct page *page) {} | |
81 | ||
82 | static inline int migrate_huge_page_move_mapping(struct address_space *mapping, | |
83 | struct page *newpage, struct page *page) | |
84 | { | |
85 | return -ENOSYS; | |
86 | } | |
87 | ||
88 | /* Possible settings for the migrate_page() method in address_operations */ | |
89 | #define migrate_page NULL | |
90 | #define fail_migrate_page NULL | |
91 | ||
92 | #endif /* CONFIG_MIGRATION */ | |
93 | ||
94 | #ifdef CONFIG_NUMA_BALANCING | |
95 | extern int migrate_misplaced_page(struct page *page, int node); | |
96 | extern int migrate_misplaced_page(struct page *page, int node); | |
97 | extern bool migrate_ratelimited(int node); | |
98 | #else | |
99 | static inline int migrate_misplaced_page(struct page *page, int node) | |
100 | { | |
101 | return -EAGAIN; /* can't migrate now */ | |
102 | } | |
103 | static inline bool migrate_ratelimited(int node) | |
104 | { | |
105 | return false; | |
106 | } | |
107 | #endif /* CONFIG_NUMA_BALANCING */ | |
108 | ||
109 | #if defined(CONFIG_NUMA_BALANCING) && defined(CONFIG_TRANSPARENT_HUGEPAGE) | |
110 | extern int migrate_misplaced_transhuge_page(struct mm_struct *mm, | |
111 | struct vm_area_struct *vma, | |
112 | pmd_t *pmd, pmd_t entry, | |
113 | unsigned long address, | |
114 | struct page *page, int node); | |
115 | #else | |
116 | static inline int migrate_misplaced_transhuge_page(struct mm_struct *mm, | |
117 | struct vm_area_struct *vma, | |
118 | pmd_t *pmd, pmd_t entry, | |
119 | unsigned long address, | |
120 | struct page *page, int node) | |
121 | { | |
122 | return -EAGAIN; | |
123 | } | |
124 | #endif /* CONFIG_NUMA_BALANCING && CONFIG_TRANSPARENT_HUGEPAGE*/ | |
125 | ||
126 | #endif /* _LINUX_MIGRATE_H */ |