#ifndef _LINUX_MIGRATE_H #define _LINUX_MIGRATE_H #include #include #include typedef struct page *new_page_t(struct page *page, unsigned long private, int **reason); typedef void free_page_t(struct page *page, unsigned long private); /* * Return values from addresss_space_operations.migratepage(): * - negative errno on page migration failure; * - zero on page migration success; */ #define MIGRATEPAGE_SUCCESS 0 enum migrate_reason { MR_COMPACTION, MR_MEMORY_FAILURE, MR_MEMORY_HOTPLUG, MR_SYSCALL, /* also applies to cpusets */ MR_MEMPOLICY_MBIND, MR_NUMA_MISPLACED, MR_CMA }; #ifdef CONFIG_MIGRATION extern void putback_movable_pages(struct list_head *l); extern int migrate_page(struct address_space *, struct page *, struct page *, enum migrate_mode); extern int migrate_pages(struct list_head *l, new_page_t new, free_page_t free, unsigned long private, enum migrate_mode mode, int reason); extern int migrate_prep(void); extern int migrate_prep_local(void); extern int migrate_vmas(struct mm_struct *mm, const nodemask_t *from, const nodemask_t *to, unsigned long flags); extern void migrate_page_copy(struct page *newpage, struct page *page); extern int migrate_huge_page_move_mapping(struct address_space *mapping, struct page *newpage, struct page *page); extern int migrate_page_move_mapping(struct address_space *mapping, struct page *newpage, struct page *page, struct buffer_head *head, enum migrate_mode mode, int extra_count); #else static inline void putback_movable_pages(struct list_head *l) {} static inline int migrate_pages(struct list_head *l, new_page_t new, free_page_t free, unsigned long private, enum migrate_mode mode, int reason) { return -ENOSYS; } static inline int migrate_prep(void) { return -ENOSYS; } static inline int migrate_prep_local(void) { return -ENOSYS; } static inline int migrate_vmas(struct mm_struct *mm, const nodemask_t *from, const nodemask_t *to, unsigned long flags) { return -ENOSYS; } static inline void migrate_page_copy(struct page *newpage, struct page *page) {} static inline int migrate_huge_page_move_mapping(struct address_space *mapping, struct page *newpage, struct page *page) { return -ENOSYS; } /* Possible settings for the migrate_page() method in address_operations */ #define migrate_page NULL #endif /* CONFIG_MIGRATION */ #ifdef CONFIG_NUMA_BALANCING extern bool pmd_trans_migrating(pmd_t pmd); extern void wait_migrate_huge_page(struct anon_vma *anon_vma, pmd_t *pmd); extern int migrate_misplaced_page(struct page *page, struct vm_area_struct *vma, int node); extern bool migrate_ratelimited(int node); #else static inline bool pmd_trans_migrating(pmd_t pmd) { return false; } static inline void wait_migrate_huge_page(struct anon_vma *anon_vma, pmd_t *pmd) { } static inline int migrate_misplaced_page(struct page *page, struct vm_area_struct *vma, int node) { return -EAGAIN; /* can't migrate now */ } static inline bool migrate_ratelimited(int node) { return false; } #endif /* CONFIG_NUMA_BALANCING */ #if defined(CONFIG_NUMA_BALANCING) && defined(CONFIG_TRANSPARENT_HUGEPAGE) extern int migrate_misplaced_transhuge_page(struct mm_struct *mm, struct vm_area_struct *vma, pmd_t *pmd, pmd_t entry, unsigned long address, struct page *page, int node); #else static inline int migrate_misplaced_transhuge_page(struct mm_struct *mm, struct vm_area_struct *vma, pmd_t *pmd, pmd_t entry, unsigned long address, struct page *page, int node) { return -EAGAIN; } #endif /* CONFIG_NUMA_BALANCING && CONFIG_TRANSPARENT_HUGEPAGE*/ #endif /* _LINUX_MIGRATE_H */