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