1 #ifndef _LINUX_MIGRATE_H
2 #define _LINUX_MIGRATE_H
5 #include <linux/mempolicy.h>
6 #include <linux/migrate_mode.h>
8 typedef struct page *new_page_t(struct page *page, unsigned long private,
10 typedef void free_page_t(struct page *page, unsigned long private);
13 * Return values from addresss_space_operations.migratepage():
14 * - negative errno on page migration failure;
15 * - zero on page migration success;
17 #define MIGRATEPAGE_SUCCESS 0
23 MR_SYSCALL, /* also applies to cpusets */
30 /* In mm/debug.c; also keep sync with include/trace/events/migrate.h */
31 extern char *migrate_reason_names[MR_TYPES];
33 #ifdef CONFIG_MIGRATION
35 extern void putback_movable_pages(struct list_head *l);
36 extern int migrate_page(struct address_space *,
37 struct page *, struct page *, enum migrate_mode);
38 extern 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 extern int isolate_movable_page(struct page *page, isolate_mode_t mode);
41 extern void putback_movable_page(struct page *page);
43 extern int migrate_prep(void);
44 extern int migrate_prep_local(void);
45 extern void migrate_page_copy(struct page *newpage, struct page *page);
46 extern int migrate_huge_page_move_mapping(struct address_space *mapping,
47 struct page *newpage, struct page *page);
48 extern 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,
54 static inline void putback_movable_pages(struct list_head *l) {}
55 static inline int migrate_pages(struct list_head *l, new_page_t new,
56 free_page_t free, unsigned long private, enum migrate_mode mode,
59 static inline int isolate_movable_page(struct page *page, isolate_mode_t mode)
62 static inline int migrate_prep(void) { return -ENOSYS; }
63 static inline int migrate_prep_local(void) { return -ENOSYS; }
65 static inline void migrate_page_copy(struct page *newpage,
68 static inline int migrate_huge_page_move_mapping(struct address_space *mapping,
69 struct page *newpage, struct page *page)
74 #endif /* CONFIG_MIGRATION */
76 #ifdef CONFIG_COMPACTION
77 extern int PageMovable(struct page *page);
78 extern void __SetPageMovable(struct page *page, struct address_space *mapping);
79 extern void __ClearPageMovable(struct page *page);
81 static inline int PageMovable(struct page *page) { return 0; };
82 static inline void __SetPageMovable(struct page *page,
83 struct address_space *mapping)
86 static inline void __ClearPageMovable(struct page *page)
91 #ifdef CONFIG_NUMA_BALANCING
92 extern bool pmd_trans_migrating(pmd_t pmd);
93 extern int migrate_misplaced_page(struct page *page,
94 struct vm_area_struct *vma, int node);
96 static inline bool pmd_trans_migrating(pmd_t pmd)
100 static inline int migrate_misplaced_page(struct page *page,
101 struct vm_area_struct *vma, int node)
103 return -EAGAIN; /* can't migrate now */
105 #endif /* CONFIG_NUMA_BALANCING */
107 #if defined(CONFIG_NUMA_BALANCING) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
108 extern 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);
114 static 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)
122 #endif /* CONFIG_NUMA_BALANCING && CONFIG_TRANSPARENT_HUGEPAGE*/
124 #endif /* _LINUX_MIGRATE_H */