Linux kernel mirror (for testing)
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linux
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
8typedef struct page *new_page_t(struct page *page, unsigned long private,
9 int **reason);
10typedef void free_page_t(struct page *page, unsigned long private);
11
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
18
19enum migrate_reason {
20 MR_COMPACTION,
21 MR_MEMORY_FAILURE,
22 MR_MEMORY_HOTPLUG,
23 MR_SYSCALL, /* also applies to cpusets */
24 MR_MEMPOLICY_MBIND,
25 MR_NUMA_MISPLACED,
26 MR_CMA,
27 MR_TYPES
28};
29
30/* In mm/debug.c; also keep sync with include/trace/events/migrate.h */
31extern char *migrate_reason_names[MR_TYPES];
32
33#ifdef CONFIG_MIGRATION
34
35extern void putback_movable_pages(struct list_head *l);
36extern int migrate_page(struct address_space *,
37 struct page *, struct page *, enum migrate_mode);
38extern int migrate_pages(struct list_head *l, new_page_t new, free_page_t free,
39 unsigned long private, enum migrate_mode mode, int reason);
40extern int isolate_movable_page(struct page *page, isolate_mode_t mode);
41extern void putback_movable_page(struct page *page);
42
43extern int migrate_prep(void);
44extern int migrate_prep_local(void);
45extern void migrate_page_copy(struct page *newpage, struct page *page);
46extern int migrate_huge_page_move_mapping(struct address_space *mapping,
47 struct page *newpage, struct page *page);
48extern int migrate_page_move_mapping(struct address_space *mapping,
49 struct page *newpage, struct page *page,
50 struct buffer_head *head, enum migrate_mode mode,
51 int extra_count);
52#else
53
54static inline void putback_movable_pages(struct list_head *l) {}
55static 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)
58 { return -ENOSYS; }
59static inline int isolate_movable_page(struct page *page, isolate_mode_t mode)
60 { return -EBUSY; }
61
62static inline int migrate_prep(void) { return -ENOSYS; }
63static inline int migrate_prep_local(void) { return -ENOSYS; }
64
65static inline void migrate_page_copy(struct page *newpage,
66 struct page *page) {}
67
68static inline int migrate_huge_page_move_mapping(struct address_space *mapping,
69 struct page *newpage, struct page *page)
70{
71 return -ENOSYS;
72}
73
74#endif /* CONFIG_MIGRATION */
75
76#ifdef CONFIG_COMPACTION
77extern int PageMovable(struct page *page);
78extern void __SetPageMovable(struct page *page, struct address_space *mapping);
79extern void __ClearPageMovable(struct page *page);
80#else
81static inline int PageMovable(struct page *page) { return 0; };
82static inline void __SetPageMovable(struct page *page,
83 struct address_space *mapping)
84{
85}
86static inline void __ClearPageMovable(struct page *page)
87{
88}
89#endif
90
91#ifdef CONFIG_NUMA_BALANCING
92extern bool pmd_trans_migrating(pmd_t pmd);
93extern int migrate_misplaced_page(struct page *page,
94 struct vm_area_struct *vma, int node);
95#else
96static inline bool pmd_trans_migrating(pmd_t pmd)
97{
98 return false;
99}
100static inline int migrate_misplaced_page(struct page *page,
101 struct vm_area_struct *vma, int node)
102{
103 return -EAGAIN; /* can't migrate now */
104}
105#endif /* CONFIG_NUMA_BALANCING */
106
107#if defined(CONFIG_NUMA_BALANCING) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
108extern int migrate_misplaced_transhuge_page(struct mm_struct *mm,
109 struct vm_area_struct *vma,
110 pmd_t *pmd, pmd_t entry,
111 unsigned long address,
112 struct page *page, int node);
113#else
114static inline int migrate_misplaced_transhuge_page(struct mm_struct *mm,
115 struct vm_area_struct *vma,
116 pmd_t *pmd, pmd_t entry,
117 unsigned long address,
118 struct page *page, int node)
119{
120 return -EAGAIN;
121}
122#endif /* CONFIG_NUMA_BALANCING && CONFIG_TRANSPARENT_HUGEPAGE*/
123
124#endif /* _LINUX_MIGRATE_H */