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 int migrate_vmas(struct mm_struct *mm,
40 const nodemask_t *from, const nodemask_t *to,
42 extern void migrate_page_copy(struct page *newpage, struct page *page);
43 extern int migrate_huge_page_move_mapping(struct address_space *mapping,
44 struct page *newpage, struct page *page);
45 extern 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,
51 static inline void putback_movable_pages(struct list_head *l) {}
52 static inline int migrate_pages(struct list_head *l, new_page_t new,
53 free_page_t free, unsigned long private, enum migrate_mode mode,
57 static inline int migrate_prep(void) { return -ENOSYS; }
58 static inline int migrate_prep_local(void) { return -ENOSYS; }
60 static inline int migrate_vmas(struct mm_struct *mm,
61 const nodemask_t *from, const nodemask_t *to,
67 static inline void migrate_page_copy(struct page *newpage,
70 static inline int migrate_huge_page_move_mapping(struct address_space *mapping,
71 struct page *newpage, struct page *page)
76 #endif /* CONFIG_MIGRATION */
78 #ifdef CONFIG_NUMA_BALANCING
79 extern bool pmd_trans_migrating(pmd_t pmd);
80 extern void wait_migrate_huge_page(struct anon_vma *anon_vma, pmd_t *pmd);
81 extern int migrate_misplaced_page(struct page *page,
82 struct vm_area_struct *vma, int node);
83 extern bool migrate_ratelimited(int node);
85 static inline bool pmd_trans_migrating(pmd_t pmd)
89 static inline void wait_migrate_huge_page(struct anon_vma *anon_vma, pmd_t *pmd)
92 static inline int migrate_misplaced_page(struct page *page,
93 struct vm_area_struct *vma, int node)
95 return -EAGAIN; /* can't migrate now */
97 static inline bool migrate_ratelimited(int node)
101 #endif /* CONFIG_NUMA_BALANCING */
103 #if defined(CONFIG_NUMA_BALANCING) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
104 extern 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);
110 static 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)
118 #endif /* CONFIG_NUMA_BALANCING && CONFIG_TRANSPARENT_HUGEPAGE*/
120 #endif /* _LINUX_MIGRATE_H */