1 #ifndef _LINUX_MIGRATE_H 2 #define _LINUX_MIGRATE_H 3 4 #include <linux/mm.h> 5 #include <linux/mempolicy.h> 6 #include <linux/migrate_mode.h> 7 8 typedef struct page *new_page_t(struct page *page, unsigned long private, 9 int **reason); 10 typedef void free_page_t(struct page *page, unsigned long private); 11 12 /* 13 * Return values from addresss_space_operations.migratepage(): 14 * - negative errno on page migration failure; 15 * - zero on page migration success; 16 */ 17 #define MIGRATEPAGE_SUCCESS 0 18 19 enum migrate_reason { 20 MR_COMPACTION, 21 MR_MEMORY_FAILURE, 22 MR_MEMORY_HOTPLUG, 23 MR_SYSCALL, /* also applies to cpusets */ 24 MR_MEMPOLICY_MBIND, 25 MR_NUMA_MISPLACED, 26 MR_CMA, 27 MR_TYPES 28 }; 29 30 /* In mm/debug.c; also keep sync with include/trace/events/migrate.h */ 31 extern char *migrate_reason_names[MR_TYPES]; 32 33 #ifdef CONFIG_MIGRATION 34 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 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, 49 int extra_count); 50 #else 51 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, 55 int reason) 56 { return -ENOSYS; } 57 58 static inline int migrate_prep(void) { return -ENOSYS; } 59 static inline int migrate_prep_local(void) { return -ENOSYS; } 60 61 static inline void migrate_page_copy(struct page *newpage, 62 struct page *page) {} 63 64 static inline int migrate_huge_page_move_mapping(struct address_space *mapping, 65 struct page *newpage, struct page *page) 66 { 67 return -ENOSYS; 68 } 69 70 #endif /* CONFIG_MIGRATION */ 71 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); 76 #else 77 static inline bool pmd_trans_migrating(pmd_t pmd) 78 { 79 return false; 80 } 81 static inline int migrate_misplaced_page(struct page *page, 82 struct vm_area_struct *vma, int node) 83 { 84 return -EAGAIN; /* can't migrate now */ 85 } 86 #endif /* CONFIG_NUMA_BALANCING */ 87 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); 94 #else 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) 100 { 101 return -EAGAIN; 102 } 103 #endif /* CONFIG_NUMA_BALANCING && CONFIG_TRANSPARENT_HUGEPAGE*/ 104 105 #endif /* _LINUX_MIGRATE_H */ 106