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 #include <linux/migrate_mode.h>
   7
   8 typedef struct page *new_page_t(struct page *, unsigned long private, int **);
   9
  10 enum migrate_reason {
  11         MR_COMPACTION,
  12         MR_MEMORY_FAILURE,
  13         MR_MEMORY_HOTPLUG,
  14         MR_SYSCALL,             /* also applies to cpusets */
  15         MR_MEMPOLICY_MBIND,
  16         MR_NUMA_MISPLACED,
  17         MR_CMA
  18 };
  19
  20 #ifdef CONFIG_MIGRATION
  21
  22 extern void putback_lru_pages(struct list_head *l);
  23 extern int migrate_page(struct address_space *,
  24                         struct page *, struct page *, enum migrate_mode);
  25 extern int migrate_pages(struct list_head *l, new_page_t x,
  26                         unsigned long private, bool offlining,
  27                         enum migrate_mode mode, int reason);
  28 extern int migrate_huge_page(struct page *, new_page_t x,
  29                         unsigned long private, bool offlining,
  30                         enum migrate_mode mode);
  31
  32 extern int fail_migrate_page(struct address_space *,
  33                         struct page *, struct page *);
  34
  35 extern int migrate_prep(void);
  36 extern int migrate_prep_local(void);
  37 extern int migrate_vmas(struct mm_struct *mm,
  38                 const nodemask_t *from, const nodemask_t *to,
  39                 unsigned long flags);
  40 extern void migrate_page_copy(struct page *newpage, struct page *page);
  41 extern int migrate_huge_page_move_mapping(struct address_space *mapping,
  42                                   struct page *newpage, struct page *page);
  43 #else
  44
  45 static inline void putback_lru_pages(struct list_head *l) {}
  46 static inline int migrate_pages(struct list_head *l, new_page_t x,
  47                 unsigned long private, bool offlining,
  48                 enum migrate_mode mode, int reason) { return -ENOSYS; }
  49 static inline int migrate_huge_page(struct page *page, new_page_t x,
  50                 unsigned long private, bool offlining,
  51                 enum migrate_mode mode) { return -ENOSYS; }
  52
  53 static inline int migrate_prep(void) { return -ENOSYS; }
  54 static inline int migrate_prep_local(void) { return -ENOSYS; }
  55
  56 static inline int migrate_vmas(struct mm_struct *mm,
  57                 const nodemask_t *from, const nodemask_t *to,
  58                 unsigned long flags)
  59 {
  60         return -ENOSYS;
  61 }
  62
  63 static inline void migrate_page_copy(struct page *newpage,
  64                                      struct page *page) {}
  65
  66 static inline int migrate_huge_page_move_mapping(struct address_space *mapping,
  67                                   struct page *newpage, struct page *page)
  68 {
  69         return -ENOSYS;
  70 }
  71
  72 /* Possible settings for the migrate_page() method in address_operations */
  73 #define migrate_page NULL
  74 #define fail_migrate_page NULL
  75
  76 #endif /* CONFIG_MIGRATION */
  77
  78 #ifdef CONFIG_NUMA_BALANCING
  79 extern int migrate_misplaced_page(struct page *page, int node);
  80 extern int migrate_misplaced_page(struct page *page, int node);
  81 extern bool migrate_ratelimited(int node);
  82 #else
  83 static inline int migrate_misplaced_page(struct page *page, int node)
  84 {
  85         return -EAGAIN; /* can't migrate now */
  86 }
  87 static inline bool migrate_ratelimited(int node)
  88 {
  89         return false;
  90 }
  91 #endif /* CONFIG_NUMA_BALANCING */
  92
  93 #if defined(CONFIG_NUMA_BALANCING) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
  94 extern int migrate_misplaced_transhuge_page(struct mm_struct *mm,
  95                         struct vm_area_struct *vma,
  96                         pmd_t *pmd, pmd_t entry,
  97                         unsigned long address,
  98                         struct page *page, int node);
  99 #else
 100 static inline int migrate_misplaced_transhuge_page(struct mm_struct *mm,
 101                         struct vm_area_struct *vma,
 102                         pmd_t *pmd, pmd_t entry,
 103                         unsigned long address,
 104                         struct page *page, int node)
 105 {
 106         return -EAGAIN;
 107 }
 108 #endif /* CONFIG_NUMA_BALANCING && CONFIG_TRANSPARENT_HUGEPAGE*/
 109
 110 #endif /* _LINUX_MIGRATE_H */