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