1 #ifndef _LINUX_MIGRATE_H
2 #define _LINUX_MIGRATE_H
5 #include <linux/mempolicy.h>
6 #include <linux/migrate_mode.h>
7 #include <linux/hugetlb.h>
9 typedef struct page *new_page_t(struct page *page, unsigned long private,
11 typedef void free_page_t(struct page *page, unsigned long private);
14 * Return values from addresss_space_operations.migratepage():
15 * - negative errno on page migration failure;
16 * - zero on page migration success;
18 #define MIGRATEPAGE_SUCCESS 0
24 MR_SYSCALL, /* also applies to cpusets */
31 /* In mm/debug.c; also keep sync with include/trace/events/migrate.h */
32 extern char *migrate_reason_names[MR_TYPES];
34 static inline struct page *new_page_nodemask(struct page *page,
35 int preferred_nid, nodemask_t *nodemask)
37 gfp_t gfp_mask = GFP_USER | __GFP_MOVABLE | __GFP_RETRY_MAYFAIL;
40 return alloc_huge_page_nodemask(page_hstate(compound_head(page)),
41 preferred_nid, nodemask);
43 if (PageHighMem(page) || (zone_idx(page_zone(page)) == ZONE_MOVABLE))
44 gfp_mask |= __GFP_HIGHMEM;
46 return __alloc_pages_nodemask(gfp_mask, 0, preferred_nid, nodemask);
49 #ifdef CONFIG_MIGRATION
51 extern void putback_movable_pages(struct list_head *l);
52 extern int migrate_page(struct address_space *mapping,
53 struct page *newpage, struct page *page,
54 enum migrate_mode mode);
55 extern 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);
57 extern int isolate_movable_page(struct page *page, isolate_mode_t mode);
58 extern void putback_movable_page(struct page *page);
60 extern int migrate_prep(void);
61 extern int migrate_prep_local(void);
62 extern void migrate_page_copy(struct page *newpage, struct page *page);
63 extern int migrate_huge_page_move_mapping(struct address_space *mapping,
64 struct page *newpage, struct page *page);
65 extern 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,
71 static inline void putback_movable_pages(struct list_head *l) {}
72 static inline int migrate_pages(struct list_head *l, new_page_t new,
73 free_page_t free, unsigned long private, enum migrate_mode mode,
76 static inline int isolate_movable_page(struct page *page, isolate_mode_t mode)
79 static inline int migrate_prep(void) { return -ENOSYS; }
80 static inline int migrate_prep_local(void) { return -ENOSYS; }
82 static inline void migrate_page_copy(struct page *newpage,
85 static inline int migrate_huge_page_move_mapping(struct address_space *mapping,
86 struct page *newpage, struct page *page)
91 #endif /* CONFIG_MIGRATION */
93 #ifdef CONFIG_COMPACTION
94 extern int PageMovable(struct page *page);
95 extern void __SetPageMovable(struct page *page, struct address_space *mapping);
96 extern void __ClearPageMovable(struct page *page);
98 static inline int PageMovable(struct page *page) { return 0; };
99 static inline void __SetPageMovable(struct page *page,
100 struct address_space *mapping)
103 static inline void __ClearPageMovable(struct page *page)
108 #ifdef CONFIG_NUMA_BALANCING
109 extern bool pmd_trans_migrating(pmd_t pmd);
110 extern int migrate_misplaced_page(struct page *page,
111 struct vm_area_struct *vma, int node);
113 static inline bool pmd_trans_migrating(pmd_t pmd)
117 static inline int migrate_misplaced_page(struct page *page,
118 struct vm_area_struct *vma, int node)
120 return -EAGAIN; /* can't migrate now */
122 #endif /* CONFIG_NUMA_BALANCING */
124 #if defined(CONFIG_NUMA_BALANCING) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
125 extern 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);
131 static 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)
139 #endif /* CONFIG_NUMA_BALANCING && CONFIG_TRANSPARENT_HUGEPAGE*/
141 #endif /* _LINUX_MIGRATE_H */