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 extern bool isolate_movable_page(struct page *page, isolate_mode_t mode); 41 extern void putback_movable_page(struct page *page); 42 43 extern int migrate_prep(void); 44 extern int migrate_prep_local(void); 45 extern void migrate_page_copy(struct page *newpage, struct page *page); 46 extern int migrate_huge_page_move_mapping(struct address_space *mapping, 47 struct page *newpage, struct page *page); 48 extern int migrate_page_move_mapping(struct address_space *mapping, 49 struct page *newpage, struct page *page, 50 struct buffer_head *head, enum migrate_mode mode, 51 int extra_count); 52 #else 53 54 static inline void putback_movable_pages(struct list_head *l) {} 55 static inline int migrate_pages(struct list_head *l, new_page_t new, 56 free_page_t free, unsigned long private, enum migrate_mode mode, 57 int reason) 58 { return -ENOSYS; } 59 60 static inline int migrate_prep(void) { return -ENOSYS; } 61 static inline int migrate_prep_local(void) { return -ENOSYS; } 62 63 static inline void migrate_page_copy(struct page *newpage, 64 struct page *page) {} 65 66 static inline int migrate_huge_page_move_mapping(struct address_space *mapping, 67 struct page *newpage, struct page *page) 68 { 69 return -ENOSYS; 70 } 71 72 #endif /* CONFIG_MIGRATION */ 73 74 #ifdef CONFIG_COMPACTION 75 extern int PageMovable(struct page *page); 76 extern void __SetPageMovable(struct page *page, struct address_space *mapping); 77 extern void __ClearPageMovable(struct page *page); 78 #else 79 static inline int PageMovable(struct page *page) { return 0; }; 80 static inline void __SetPageMovable(struct page *page, 81 struct address_space *mapping) 82 { 83 } 84 static inline void __ClearPageMovable(struct page *page) 85 { 86 } 87 #endif 88 89 #ifdef CONFIG_NUMA_BALANCING 90 extern bool pmd_trans_migrating(pmd_t pmd); 91 extern int migrate_misplaced_page(struct page *page, 92 struct vm_area_struct *vma, int node); 93 #else 94 static inline bool pmd_trans_migrating(pmd_t pmd) 95 { 96 return false; 97 } 98 static inline int migrate_misplaced_page(struct page *page, 99 struct vm_area_struct *vma, int node) 100 { 101 return -EAGAIN; /* can't migrate now */ 102 } 103 #endif /* CONFIG_NUMA_BALANCING */ 104 105 #if defined(CONFIG_NUMA_BALANCING) && defined(CONFIG_TRANSPARENT_HUGEPAGE) 106 extern int migrate_misplaced_transhuge_page(struct mm_struct *mm, 107 struct vm_area_struct *vma, 108 pmd_t *pmd, pmd_t entry, 109 unsigned long address, 110 struct page *page, int node); 111 #else 112 static inline int migrate_misplaced_transhuge_page(struct mm_struct *mm, 113 struct vm_area_struct *vma, 114 pmd_t *pmd, pmd_t entry, 115 unsigned long address, 116 struct page *page, int node) 117 { 118 return -EAGAIN; 119 } 120 #endif /* CONFIG_NUMA_BALANCING && CONFIG_TRANSPARENT_HUGEPAGE*/ 121 122 #endif /* _LINUX_MIGRATE_H */ 123