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