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};
28
29#ifdef CONFIG_MIGRATION
30
31extern void putback_movable_pages(struct list_head *l);
32extern int migrate_page(struct address_space *,
33 struct page *, struct page *, enum migrate_mode);
34extern int migrate_pages(struct list_head *l, new_page_t new, free_page_t free,
35 unsigned long private, enum migrate_mode mode, int reason);
36
37extern int migrate_prep(void);
38extern int migrate_prep_local(void);
39extern void migrate_page_copy(struct page *newpage, struct page *page);
40extern int migrate_huge_page_move_mapping(struct address_space *mapping,
41 struct page *newpage, struct page *page);
42extern int migrate_page_move_mapping(struct address_space *mapping,
43 struct page *newpage, struct page *page,
44 struct buffer_head *head, enum migrate_mode mode,
45 int extra_count);
46#else
47
48static inline void putback_movable_pages(struct list_head *l) {}
49static inline int migrate_pages(struct list_head *l, new_page_t new,
50 free_page_t free, unsigned long private, enum migrate_mode mode,
51 int reason)
52 { return -ENOSYS; }
53
54static inline int migrate_prep(void) { return -ENOSYS; }
55static inline int migrate_prep_local(void) { return -ENOSYS; }
56
57static inline void migrate_page_copy(struct page *newpage,
58 struct page *page) {}
59
60static inline int migrate_huge_page_move_mapping(struct address_space *mapping,
61 struct page *newpage, struct page *page)
62{
63 return -ENOSYS;
64}
65
66#endif /* CONFIG_MIGRATION */
67
68#ifdef CONFIG_NUMA_BALANCING
69extern bool pmd_trans_migrating(pmd_t pmd);
70extern int migrate_misplaced_page(struct page *page,
71 struct vm_area_struct *vma, int node);
72extern bool migrate_ratelimited(int node);
73#else
74static inline bool pmd_trans_migrating(pmd_t pmd)
75{
76 return false;
77}
78static inline int migrate_misplaced_page(struct page *page,
79 struct vm_area_struct *vma, int node)
80{
81 return -EAGAIN; /* can't migrate now */
82}
83static inline bool migrate_ratelimited(int node)
84{
85 return false;
86}
87#endif /* CONFIG_NUMA_BALANCING */
88
89#if defined(CONFIG_NUMA_BALANCING) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
90extern int migrate_misplaced_transhuge_page(struct mm_struct *mm,
91 struct vm_area_struct *vma,
92 pmd_t *pmd, pmd_t entry,
93 unsigned long address,
94 struct page *page, int node);
95#else
96static inline int migrate_misplaced_transhuge_page(struct mm_struct *mm,
97 struct vm_area_struct *vma,
98 pmd_t *pmd, pmd_t entry,
99 unsigned long address,
100 struct page *page, int node)
101{
102 return -EAGAIN;
103}
104#endif /* CONFIG_NUMA_BALANCING && CONFIG_TRANSPARENT_HUGEPAGE*/
105
106#endif /* _LINUX_MIGRATE_H */