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 *mapping, 37 struct page *newpage, struct page *page, 38 enum migrate_mode mode); 39 extern int migrate_pages(struct list_head *l, new_page_t new, free_page_t free, 40 unsigned long private, enum migrate_mode mode, int reason); 41 extern int isolate_movable_page(struct page *page, isolate_mode_t mode); 42 extern void putback_movable_page(struct page *page); 43 44 extern int migrate_prep(void); 45 extern int migrate_prep_local(void); 46 extern void migrate_page_copy(struct page *newpage, struct page *page); 47 extern int migrate_huge_page_move_mapping(struct address_space *mapping, 48 struct page *newpage, struct page *page); 49 extern int migrate_page_move_mapping(struct address_space *mapping, 50 struct page *newpage, struct page *page, 51 struct buffer_head *head, enum migrate_mode mode, 52 int extra_count); 53 #else 54 55 static inline void putback_movable_pages(struct list_head *l) {} 56 static inline int migrate_pages(struct list_head *l, new_page_t new, 57 free_page_t free, unsigned long private, enum migrate_mode mode, 58 int reason) 59 { return -ENOSYS; } 60 static inline int isolate_movable_page(struct page *page, isolate_mode_t mode) 61 { return -EBUSY; } 62 63 static inline int migrate_prep(void) { return -ENOSYS; } 64 static inline int migrate_prep_local(void) { return -ENOSYS; } 65 66 static inline void migrate_page_copy(struct page *newpage, 67 struct page *page) {} 68 69 static inline int migrate_huge_page_move_mapping(struct address_space *mapping, 70 struct page *newpage, struct page *page) 71 { 72 return -ENOSYS; 73 } 74 75 #endif /* CONFIG_MIGRATION */ 76 77 #ifdef CONFIG_COMPACTION 78 extern int PageMovable(struct page *page); 79 extern void __SetPageMovable(struct page *page, struct address_space *mapping); 80 extern void __ClearPageMovable(struct page *page); 81 #else 82 static inline int PageMovable(struct page *page) { return 0; }; 83 static inline void __SetPageMovable(struct page *page, 84 struct address_space *mapping) 85 { 86 } 87 static inline void __ClearPageMovable(struct page *page) 88 { 89 } 90 #endif 91 92 #ifdef CONFIG_NUMA_BALANCING 93 extern bool pmd_trans_migrating(pmd_t pmd); 94 extern int migrate_misplaced_page(struct page *page, 95 struct vm_area_struct *vma, int node); 96 #else 97 static inline bool pmd_trans_migrating(pmd_t pmd) 98 { 99 return false; 100 } 101 static inline int migrate_misplaced_page(struct page *page, 102 struct vm_area_struct *vma, int node) 103 { 104 return -EAGAIN; /* can't migrate now */ 105 } 106 #endif /* CONFIG_NUMA_BALANCING */ 107 108 #if defined(CONFIG_NUMA_BALANCING) && defined(CONFIG_TRANSPARENT_HUGEPAGE) 109 extern int migrate_misplaced_transhuge_page(struct mm_struct *mm, 110 struct vm_area_struct *vma, 111 pmd_t *pmd, pmd_t entry, 112 unsigned long address, 113 struct page *page, int node); 114 #else 115 static inline int migrate_misplaced_transhuge_page(struct mm_struct *mm, 116 struct vm_area_struct *vma, 117 pmd_t *pmd, pmd_t entry, 118 unsigned long address, 119 struct page *page, int node) 120 { 121 return -EAGAIN; 122 } 123 #endif /* CONFIG_NUMA_BALANCING && CONFIG_TRANSPARENT_HUGEPAGE*/ 124 125 #endif /* _LINUX_MIGRATE_H */ 126