1 #ifndef _LINUX_MIGRATE_H 2 #define _LINUX_MIGRATE_H 3 4 #include <linux/mm.h> 5 #include <linux/mempolicy.h> 6 7 typedef struct page *new_page_t(struct page *, unsigned long private, int **); 8 9 /* 10 * MIGRATE_ASYNC means never block 11 * MIGRATE_SYNC_LIGHT in the current implementation means to allow blocking 12 * on most operations but not ->writepage as the potential stall time 13 * is too significant 14 * MIGRATE_SYNC will block when migrating pages 15 */ 16 enum migrate_mode { 17 MIGRATE_ASYNC, 18 MIGRATE_SYNC_LIGHT, 19 MIGRATE_SYNC, 20 }; 21 22 #ifdef CONFIG_MIGRATION 23 #define PAGE_MIGRATION 1 24 25 extern void putback_lru_pages(struct list_head *l); 26 extern int migrate_page(struct address_space *, 27 struct page *, struct page *, enum migrate_mode); 28 extern int migrate_pages(struct list_head *l, new_page_t x, 29 unsigned long private, bool offlining, 30 enum migrate_mode mode); 31 extern int migrate_huge_pages(struct list_head *l, new_page_t x, 32 unsigned long private, bool offlining, 33 enum migrate_mode mode); 34 35 extern int fail_migrate_page(struct address_space *, 36 struct page *, struct page *); 37 38 extern int migrate_prep(void); 39 extern int migrate_prep_local(void); 40 extern int migrate_vmas(struct mm_struct *mm, 41 const nodemask_t *from, const nodemask_t *to, 42 unsigned long flags); 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 #else 47 #define PAGE_MIGRATION 0 48 49 static inline void putback_lru_pages(struct list_head *l) {} 50 static inline int migrate_pages(struct list_head *l, new_page_t x, 51 unsigned long private, bool offlining, 52 enum migrate_mode mode) { return -ENOSYS; } 53 static inline int migrate_huge_pages(struct list_head *l, new_page_t x, 54 unsigned long private, bool offlining, 55 enum migrate_mode mode) { return -ENOSYS; } 56 57 static inline int migrate_prep(void) { return -ENOSYS; } 58 static inline int migrate_prep_local(void) { return -ENOSYS; } 59 60 static 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 67 static inline void migrate_page_copy(struct page *newpage, 68 struct page *page) {} 69 70 static 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 /* Possible settings for the migrate_page() method in address_operations */ 77 #define migrate_page NULL 78 #define fail_migrate_page NULL 79 80 #endif /* CONFIG_MIGRATION */ 81 #endif /* _LINUX_MIGRATE_H */ 82