| 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 */ |