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#include <linux/migrate_mode.h>
   7#include <linux/hugetlb.h>
   8
   9typedef struct page *new_page_t(struct page *page, unsigned long private,
  10                                int **reason);
  11typedef void free_page_t(struct page *page, unsigned long private);
  12
  13/*
  14 * Return values from addresss_space_operations.migratepage():
  15 * - negative errno on page migration failure;
  16 * - zero on page migration success;
  17 */
  18#define MIGRATEPAGE_SUCCESS             0
  19
  20enum migrate_reason {
  21        MR_COMPACTION,
  22        MR_MEMORY_FAILURE,
  23        MR_MEMORY_HOTPLUG,
  24        MR_SYSCALL,             /* also applies to cpusets */
  25        MR_MEMPOLICY_MBIND,
  26        MR_NUMA_MISPLACED,
  27        MR_CMA,
  28        MR_TYPES
  29};
  30
  31/* In mm/debug.c; also keep sync with include/trace/events/migrate.h */
  32extern char *migrate_reason_names[MR_TYPES];
  33
  34static inline struct page *new_page_nodemask(struct page *page,
  35                                int preferred_nid, nodemask_t *nodemask)
  36{
  37        gfp_t gfp_mask = GFP_USER | __GFP_MOVABLE | __GFP_RETRY_MAYFAIL;
  38
  39        if (PageHuge(page))
  40                return alloc_huge_page_nodemask(page_hstate(compound_head(page)),
  41                                preferred_nid, nodemask);
  42
  43        if (PageHighMem(page) || (zone_idx(page_zone(page)) == ZONE_MOVABLE))
  44                gfp_mask |= __GFP_HIGHMEM;
  45
  46        return __alloc_pages_nodemask(gfp_mask, 0, preferred_nid, nodemask);
  47}
  48
  49#ifdef CONFIG_MIGRATION
  50
  51extern void putback_movable_pages(struct list_head *l);
  52extern int migrate_page(struct address_space *mapping,
  53                        struct page *newpage, struct page *page,
  54                        enum migrate_mode mode);
  55extern int migrate_pages(struct list_head *l, new_page_t new, free_page_t free,
  56                unsigned long private, enum migrate_mode mode, int reason);
  57extern int isolate_movable_page(struct page *page, isolate_mode_t mode);
  58extern void putback_movable_page(struct page *page);
  59
  60extern int migrate_prep(void);
  61extern int migrate_prep_local(void);
  62extern void migrate_page_copy(struct page *newpage, struct page *page);
  63extern int migrate_huge_page_move_mapping(struct address_space *mapping,
  64                                  struct page *newpage, struct page *page);
  65extern int migrate_page_move_mapping(struct address_space *mapping,
  66                struct page *newpage, struct page *page,
  67                struct buffer_head *head, enum migrate_mode mode,
  68                int extra_count);
  69#else
  70
  71static inline void putback_movable_pages(struct list_head *l) {}
  72static inline int migrate_pages(struct list_head *l, new_page_t new,
  73                free_page_t free, unsigned long private, enum migrate_mode mode,
  74                int reason)
  75        { return -ENOSYS; }
  76static inline int isolate_movable_page(struct page *page, isolate_mode_t mode)
  77        { return -EBUSY; }
  78
  79static inline int migrate_prep(void) { return -ENOSYS; }
  80static inline int migrate_prep_local(void) { return -ENOSYS; }
  81
  82static inline void migrate_page_copy(struct page *newpage,
  83                                     struct page *page) {}
  84
  85static inline int migrate_huge_page_move_mapping(struct address_space *mapping,
  86                                  struct page *newpage, struct page *page)
  87{
  88        return -ENOSYS;
  89}
  90
  91#endif /* CONFIG_MIGRATION */
  92
  93#ifdef CONFIG_COMPACTION
  94extern int PageMovable(struct page *page);
  95extern void __SetPageMovable(struct page *page, struct address_space *mapping);
  96extern void __ClearPageMovable(struct page *page);
  97#else
  98static inline int PageMovable(struct page *page) { return 0; };
  99static inline void __SetPageMovable(struct page *page,
 100                                struct address_space *mapping)
 101{
 102}
 103static inline void __ClearPageMovable(struct page *page)
 104{
 105}
 106#endif
 107
 108#ifdef CONFIG_NUMA_BALANCING
 109extern bool pmd_trans_migrating(pmd_t pmd);
 110extern int migrate_misplaced_page(struct page *page,
 111                                  struct vm_area_struct *vma, int node);
 112#else
 113static inline bool pmd_trans_migrating(pmd_t pmd)
 114{
 115        return false;
 116}
 117static inline int migrate_misplaced_page(struct page *page,
 118                                         struct vm_area_struct *vma, int node)
 119{
 120        return -EAGAIN; /* can't migrate now */
 121}
 122#endif /* CONFIG_NUMA_BALANCING */
 123
 124#if defined(CONFIG_NUMA_BALANCING) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
 125extern int migrate_misplaced_transhuge_page(struct mm_struct *mm,
 126                        struct vm_area_struct *vma,
 127                        pmd_t *pmd, pmd_t entry,
 128                        unsigned long address,
 129                        struct page *page, int node);
 130#else
 131static inline int migrate_misplaced_transhuge_page(struct mm_struct *mm,
 132                        struct vm_area_struct *vma,
 133                        pmd_t *pmd, pmd_t entry,
 134                        unsigned long address,
 135                        struct page *page, int node)
 136{
 137        return -EAGAIN;
 138}
 139#endif /* CONFIG_NUMA_BALANCING && CONFIG_TRANSPARENT_HUGEPAGE*/
 140
 141#endif /* _LINUX_MIGRATE_H */
 142