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 *mapping,
37 struct page *newpage, struct page *page,
38 enum migrate_mode mode);
39extern int migrate_pages(struct list_head *l, new_page_t new, free_page_t free,
40 unsigned long private, enum migrate_mode mode, int reason);
41extern int isolate_movable_page(struct page *page, isolate_mode_t mode);
42extern void putback_movable_page(struct page *page);
43
44extern int migrate_prep(void);
45extern int migrate_prep_local(void);
46extern void migrate_page_copy(struct page *newpage, struct page *page);
47extern int migrate_huge_page_move_mapping(struct address_space *mapping,
48 struct page *newpage, struct page *page);
49extern int migrate_page_move_mapping(struct address_space *mapping,
50 struct page *newpage, struct page *page,
51 struct buffer_head *head, enum migrate_mode mode,
52 int extra_count);
53#else
54
55static inline void putback_movable_pages(struct list_head *l) {}
56static inline int migrate_pages(struct list_head *l, new_page_t new,
57 free_page_t free, unsigned long private, enum migrate_mode mode,
58 int reason)
59 { return -ENOSYS; }
60static inline int isolate_movable_page(struct page *page, isolate_mode_t mode)
61 { return -EBUSY; }
62
63static inline int migrate_prep(void) { return -ENOSYS; }
64static inline int migrate_prep_local(void) { return -ENOSYS; }
65
66static inline void migrate_page_copy(struct page *newpage,
67 struct page *page) {}
68
69static inline int migrate_huge_page_move_mapping(struct address_space *mapping,
70 struct page *newpage, struct page *page)
71{
72 return -ENOSYS;
73}
74
75#endif /* CONFIG_MIGRATION */
76
77#ifdef CONFIG_COMPACTION
78extern int PageMovable(struct page *page);
79extern void __SetPageMovable(struct page *page, struct address_space *mapping);
80extern void __ClearPageMovable(struct page *page);
81#else
82static inline int PageMovable(struct page *page) { return 0; };
83static inline void __SetPageMovable(struct page *page,
84 struct address_space *mapping)
85{
86}
87static inline void __ClearPageMovable(struct page *page)
88{
89}
90#endif
91
92#ifdef CONFIG_NUMA_BALANCING
93extern bool pmd_trans_migrating(pmd_t pmd);
94extern int migrate_misplaced_page(struct page *page,
95 struct vm_area_struct *vma, int node);
96#else
97static inline bool pmd_trans_migrating(pmd_t pmd)
98{
99 return false;
100}
101static inline int migrate_misplaced_page(struct page *page,
102 struct vm_area_struct *vma, int node)
103{
104 return -EAGAIN; /* can't migrate now */
105}
106#endif /* CONFIG_NUMA_BALANCING */
107
108#if defined(CONFIG_NUMA_BALANCING) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
109extern int migrate_misplaced_transhuge_page(struct mm_struct *mm,
110 struct vm_area_struct *vma,
111 pmd_t *pmd, pmd_t entry,
112 unsigned long address,
113 struct page *page, int node);
114#else
115static inline int migrate_misplaced_transhuge_page(struct mm_struct *mm,
116 struct vm_area_struct *vma,
117 pmd_t *pmd, pmd_t entry,
118 unsigned long address,
119 struct page *page, int node)
120{
121 return -EAGAIN;
122}
123#endif /* CONFIG_NUMA_BALANCING && CONFIG_TRANSPARENT_HUGEPAGE*/
124
125#endif /* _LINUX_MIGRATE_H */