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);
41 extern int migrate_prep(void);
42 extern int migrate_prep_local(void);
43 extern void migrate_page_copy(struct page *newpage, struct page *page);
44 extern int migrate_huge_page_move_mapping(struct address_space *mapping,
45 struct page *newpage, struct page *page);
46 extern 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,
52 static inline void putback_movable_pages(struct list_head *l) {}
53 static inline int migrate_pages(struct list_head *l, new_page_t new,
54 free_page_t free, unsigned long private, enum migrate_mode mode,
58 static inline int migrate_prep(void) { return -ENOSYS; }
59 static inline int migrate_prep_local(void) { return -ENOSYS; }
61 static inline void migrate_page_copy(struct page *newpage,
64 static inline int migrate_huge_page_move_mapping(struct address_space *mapping,
65 struct page *newpage, struct page *page)
70 #endif /* CONFIG_MIGRATION */
72 #ifdef CONFIG_NUMA_BALANCING
73 extern bool pmd_trans_migrating(pmd_t pmd);
74 extern int migrate_misplaced_page(struct page *page,
75 struct vm_area_struct *vma, int node);
77 static inline bool pmd_trans_migrating(pmd_t pmd)
81 static inline int migrate_misplaced_page(struct page *page,
82 struct vm_area_struct *vma, int node)
84 return -EAGAIN; /* can't migrate now */
86 #endif /* CONFIG_NUMA_BALANCING */
88 #if defined(CONFIG_NUMA_BALANCING) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
89 extern 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);
95 static 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)
103 #endif /* CONFIG_NUMA_BALANCING && CONFIG_TRANSPARENT_HUGEPAGE*/
105 #endif /* _LINUX_MIGRATE_H */