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 }; 28 29 #ifdef CONFIG_MIGRATION 30 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); 36 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, 41 unsigned long flags); 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, 48 int extra_count); 49 #else 50 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, 54 int reason) 55 { 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 #endif /* CONFIG_MIGRATION */ 77 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); 84 #else 85 static inline bool pmd_trans_migrating(pmd_t pmd) 86 { 87 return false; 88 } 89 static inline void wait_migrate_huge_page(struct anon_vma *anon_vma, pmd_t *pmd) 90 { 91 } 92 static inline int migrate_misplaced_page(struct page *page, 93 struct vm_area_struct *vma, int node) 94 { 95 return -EAGAIN; /* can't migrate now */ 96 } 97 static inline bool migrate_ratelimited(int node) 98 { 99 return false; 100 } 101 #endif /* CONFIG_NUMA_BALANCING */ 102 103 #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); 109 #else 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) 115 { 116 return -EAGAIN; 117 } 118 #endif /* CONFIG_NUMA_BALANCING && CONFIG_TRANSPARENT_HUGEPAGE*/ 119 120 #endif /* _LINUX_MIGRATE_H */ 121