LXR linux/include/linux/migrate.h

   1#ifndef _LINUX_MIGRATE_H
   2#define _LINUX_MIGRATE_H
   3
   4#include <linux/mm.h>
   5#include <linux/mempolicy.h>
   6
   7typedef struct page *new_page_t(struct page *, unsigned long private, int **);
   8
   9#ifdef CONFIG_MIGRATION
  10#define PAGE_MIGRATION 1
  11
  12extern void putback_lru_pages(struct list_head *l);
  13extern int migrate_page(struct address_space *,
  14                        struct page *, struct page *);
  15extern int migrate_pages(struct list_head *l, new_page_t x,
  16                        unsigned long private, bool offlining,
  17                        bool sync);
  18extern int migrate_huge_pages(struct list_head *l, new_page_t x,
  19                        unsigned long private, bool offlining,
  20                        bool sync);
  21
  22extern int fail_migrate_page(struct address_space *,
  23                        struct page *, struct page *);
  24
  25extern int migrate_prep(void);
  26extern int migrate_prep_local(void);
  27extern int migrate_vmas(struct mm_struct *mm,
  28                const nodemask_t *from, const nodemask_t *to,
  29                unsigned long flags);
  30extern void migrate_page_copy(struct page *newpage, struct page *page);
  31extern int migrate_huge_page_move_mapping(struct address_space *mapping,
  32                                  struct page *newpage, struct page *page);
  33#else
  34#define PAGE_MIGRATION 0
  35
  36static inline void putback_lru_pages(struct list_head *l) {}
  37static inline int migrate_pages(struct list_head *l, new_page_t x,
  38                unsigned long private, bool offlining,
  39                bool sync) { return -ENOSYS; }
  40static inline int migrate_huge_pages(struct list_head *l, new_page_t x,
  41                unsigned long private, bool offlining,
  42                bool sync) { return -ENOSYS; }
  43
  44static inline int migrate_prep(void) { return -ENOSYS; }
  45static inline int migrate_prep_local(void) { return -ENOSYS; }
  46
  47static inline int migrate_vmas(struct mm_struct *mm,
  48                const nodemask_t *from, const nodemask_t *to,
  49                unsigned long flags)
  50{
  51        return -ENOSYS;
  52}
  53
  54static inline void migrate_page_copy(struct page *newpage,
  55                                     struct page *page) {}
  56
  57static inline int migrate_huge_page_move_mapping(struct address_space *mapping,
  58                                  struct page *newpage, struct page *page)
  59{
  60        return -ENOSYS;
  61}
  62
  63/* Possible settings for the migrate_page() method in address_operations */
  64#define migrate_page NULL
  65#define fail_migrate_page NULL
  66
  67#endif /* CONFIG_MIGRATION */
  68#endif /* _LINUX_MIGRATE_H */
  69