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 };
28
29 #ifdef CONFIG_MIGRATION
30
31 extern void putback_movable_pages(struct list_head *l);
32 extern int migrate_page(struct address_space *,
33 struct page *, struct page *, enum migrate_mode);
34 extern int migrate_pages(struct list_head *l, new_page_t new, free_page_t free,
35 unsigned long private, enum migrate_mode mode, int reason);
36
37 extern int migrate_prep(void);
38 extern int migrate_prep_local(void);
39 extern int migrate_vmas(struct mm_struct *mm,
40 const nodemask_t *from, const nodemask_t *to,
41 unsigned long flags);
42 extern void migrate_page_copy(struct page *newpage, struct page *page);
43 extern int migrate_huge_page_move_mapping(struct address_space *mapping,
44 struct page *newpage, struct page *page);
45 extern int migrate_page_move_mapping(struct address_space *mapping,
46 struct page *newpage, struct page *page,
47 struct buffer_head *head, enum migrate_mode mode,
48 int extra_count);
49 #else
50
putback_movable_pages(struct list_head * l)51 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)52 static inline int migrate_pages(struct list_head *l, new_page_t new,
53 free_page_t free, unsigned long private, enum migrate_mode mode,
54 int reason)
55 { return -ENOSYS; }
56
migrate_prep(void)57 static inline int migrate_prep(void) { return -ENOSYS; }
migrate_prep_local(void)58 static inline int migrate_prep_local(void) { return -ENOSYS; }
59
migrate_vmas(struct mm_struct * mm,const nodemask_t * from,const nodemask_t * to,unsigned long flags)60 static inline int migrate_vmas(struct mm_struct *mm,
61 const nodemask_t *from, const nodemask_t *to,
62 unsigned long flags)
63 {
64 return -ENOSYS;
65 }
66
migrate_page_copy(struct page * newpage,struct page * page)67 static inline void migrate_page_copy(struct page *newpage,
68 struct page *page) {}
69
migrate_huge_page_move_mapping(struct address_space * mapping,struct page * newpage,struct page * page)70 static inline int migrate_huge_page_move_mapping(struct address_space *mapping,
71 struct page *newpage, struct page *page)
72 {
73 return -ENOSYS;
74 }
75
76 #endif /* CONFIG_MIGRATION */
77
78 #ifdef CONFIG_NUMA_BALANCING
79 extern bool pmd_trans_migrating(pmd_t pmd);
80 extern void wait_migrate_huge_page(struct anon_vma *anon_vma, pmd_t *pmd);
81 extern int migrate_misplaced_page(struct page *page,
82 struct vm_area_struct *vma, int node);
83 extern bool migrate_ratelimited(int node);
84 #else
pmd_trans_migrating(pmd_t pmd)85 static inline bool pmd_trans_migrating(pmd_t pmd)
86 {
87 return false;
88 }
wait_migrate_huge_page(struct anon_vma * anon_vma,pmd_t * pmd)89 static inline void wait_migrate_huge_page(struct anon_vma *anon_vma, pmd_t *pmd)
90 {
91 }
migrate_misplaced_page(struct page * page,struct vm_area_struct * vma,int node)92 static inline int migrate_misplaced_page(struct page *page,
93 struct vm_area_struct *vma, int node)
94 {
95 return -EAGAIN; /* can't migrate now */
96 }
migrate_ratelimited(int node)97 static inline bool migrate_ratelimited(int node)
98 {
99 return false;
100 }
101 #endif /* CONFIG_NUMA_BALANCING */
102
103 #if defined(CONFIG_NUMA_BALANCING) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
104 extern int migrate_misplaced_transhuge_page(struct mm_struct *mm,
105 struct vm_area_struct *vma,
106 pmd_t *pmd, pmd_t entry,
107 unsigned long address,
108 struct page *page, int node);
109 #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)110 static inline int migrate_misplaced_transhuge_page(struct mm_struct *mm,
111 struct vm_area_struct *vma,
112 pmd_t *pmd, pmd_t entry,
113 unsigned long address,
114 struct page *page, int node)
115 {
116 return -EAGAIN;
117 }
118 #endif /* CONFIG_NUMA_BALANCING && CONFIG_TRANSPARENT_HUGEPAGE*/
119
120 #endif /* _LINUX_MIGRATE_H */
121