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 */
29 #ifdef CONFIG_MIGRATION
31 extern void putback_movable_pages(struct list_head *l);
32 extern int migrate_page(struct address_space *,
33 struct page *, struct page *, enum migrate_mode);
34 extern 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);
37 extern int migrate_prep(void);
38 extern int migrate_prep_local(void);
39 extern void migrate_page_copy(struct page *newpage, struct page *page);
40 extern int migrate_huge_page_move_mapping(struct address_space *mapping,
41 struct page *newpage, struct page *page);
42 extern 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,
48 static inline void putback_movable_pages(struct list_head *l) {}
49 static inline int migrate_pages(struct list_head *l, new_page_t new,
50 free_page_t free, unsigned long private, enum migrate_mode mode,
54 static inline int migrate_prep(void) { return -ENOSYS; }
55 static inline int migrate_prep_local(void) { return -ENOSYS; }
57 static inline void migrate_page_copy(struct page *newpage,
60 static inline int migrate_huge_page_move_mapping(struct address_space *mapping,
61 struct page *newpage, struct page *page)
66 #endif /* CONFIG_MIGRATION */
68 #ifdef CONFIG_NUMA_BALANCING
69 extern bool pmd_trans_migrating(pmd_t pmd);
70 extern int migrate_misplaced_page(struct page *page,
71 struct vm_area_struct *vma, int node);
73 static inline bool pmd_trans_migrating(pmd_t pmd)
77 static inline int migrate_misplaced_page(struct page *page,
78 struct vm_area_struct *vma, int node)
80 return -EAGAIN; /* can't migrate now */
82 #endif /* CONFIG_NUMA_BALANCING */
84 #if defined(CONFIG_NUMA_BALANCING) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
85 extern int migrate_misplaced_transhuge_page(struct mm_struct *mm,
86 struct vm_area_struct *vma,
87 pmd_t *pmd, pmd_t entry,
88 unsigned long address,
89 struct page *page, int node);
91 static inline int migrate_misplaced_transhuge_page(struct mm_struct *mm,
92 struct vm_area_struct *vma,
93 pmd_t *pmd, pmd_t entry,
94 unsigned long address,
95 struct page *page, int node)
99 #endif /* CONFIG_NUMA_BALANCING && CONFIG_TRANSPARENT_HUGEPAGE*/
101 #endif /* _LINUX_MIGRATE_H */