1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_MIGRATE_H
3 #define _LINUX_MIGRATE_H
6 #include <linux/mempolicy.h>
7 #include <linux/migrate_mode.h>
8 #include <linux/hugetlb.h>
10 typedef struct page
*new_page_t(struct page
*page
, unsigned long private);
11 typedef void free_page_t(struct page
*page
, unsigned long private);
13 struct migration_target_control
;
16 * Return values from addresss_space_operations.migratepage():
17 * - negative errno on page migration failure;
18 * - zero on page migration success;
20 #define MIGRATEPAGE_SUCCESS 0
26 MR_SYSCALL
, /* also applies to cpusets */
33 /* In mm/debug.c; also keep sync with include/trace/events/migrate.h */
34 extern const char *migrate_reason_names
[MR_TYPES
];
36 #ifdef CONFIG_MIGRATION
38 extern void putback_movable_pages(struct list_head
*l
);
39 extern int migrate_page(struct address_space
*mapping
,
40 struct page
*newpage
, struct page
*page
,
41 enum migrate_mode mode
);
42 extern int migrate_pages(struct list_head
*l
, new_page_t
new, free_page_t free
,
43 unsigned long private, enum migrate_mode mode
, int reason
);
44 extern struct page
*alloc_migration_target(struct page
*page
, unsigned long private);
45 extern int isolate_movable_page(struct page
*page
, isolate_mode_t mode
);
46 extern void putback_movable_page(struct page
*page
);
48 extern void migrate_prep(void);
49 extern void migrate_prep_local(void);
50 extern void migrate_page_states(struct page
*newpage
, struct page
*page
);
51 extern void migrate_page_copy(struct page
*newpage
, struct page
*page
);
52 extern int migrate_huge_page_move_mapping(struct address_space
*mapping
,
53 struct page
*newpage
, struct page
*page
);
54 extern int migrate_page_move_mapping(struct address_space
*mapping
,
55 struct page
*newpage
, struct page
*page
, int extra_count
);
58 static inline void putback_movable_pages(struct list_head
*l
) {}
59 static inline int migrate_pages(struct list_head
*l
, new_page_t
new,
60 free_page_t free
, unsigned long private, enum migrate_mode mode
,
63 static inline struct page
*alloc_migration_target(struct page
*page
,
64 unsigned long private)
66 static inline int isolate_movable_page(struct page
*page
, isolate_mode_t mode
)
69 static inline int migrate_prep(void) { return -ENOSYS
; }
70 static inline int migrate_prep_local(void) { return -ENOSYS
; }
72 static inline void migrate_page_states(struct page
*newpage
, struct page
*page
)
76 static inline void migrate_page_copy(struct page
*newpage
,
79 static inline int migrate_huge_page_move_mapping(struct address_space
*mapping
,
80 struct page
*newpage
, struct page
*page
)
85 #endif /* CONFIG_MIGRATION */
87 #ifdef CONFIG_COMPACTION
88 extern int PageMovable(struct page
*page
);
89 extern void __SetPageMovable(struct page
*page
, struct address_space
*mapping
);
90 extern void __ClearPageMovable(struct page
*page
);
92 static inline int PageMovable(struct page
*page
) { return 0; };
93 static inline void __SetPageMovable(struct page
*page
,
94 struct address_space
*mapping
)
97 static inline void __ClearPageMovable(struct page
*page
)
102 #ifdef CONFIG_NUMA_BALANCING
103 extern bool pmd_trans_migrating(pmd_t pmd
);
104 extern int migrate_misplaced_page(struct page
*page
,
105 struct vm_area_struct
*vma
, int node
);
107 static inline bool pmd_trans_migrating(pmd_t pmd
)
111 static inline int migrate_misplaced_page(struct page
*page
,
112 struct vm_area_struct
*vma
, int node
)
114 return -EAGAIN
; /* can't migrate now */
116 #endif /* CONFIG_NUMA_BALANCING */
118 #if defined(CONFIG_NUMA_BALANCING) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
119 extern int migrate_misplaced_transhuge_page(struct mm_struct
*mm
,
120 struct vm_area_struct
*vma
,
121 pmd_t
*pmd
, pmd_t entry
,
122 unsigned long address
,
123 struct page
*page
, int node
);
125 static inline 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
)
133 #endif /* CONFIG_NUMA_BALANCING && CONFIG_TRANSPARENT_HUGEPAGE*/
136 #ifdef CONFIG_MIGRATION
139 * Watch out for PAE architecture, which has an unsigned long, and might not
140 * have enough bits to store all physical address and flags. So far we have
141 * enough room for all our flags.
143 #define MIGRATE_PFN_VALID (1UL << 0)
144 #define MIGRATE_PFN_MIGRATE (1UL << 1)
145 #define MIGRATE_PFN_LOCKED (1UL << 2)
146 #define MIGRATE_PFN_WRITE (1UL << 3)
147 #define MIGRATE_PFN_SHIFT 6
149 static inline struct page
*migrate_pfn_to_page(unsigned long mpfn
)
151 if (!(mpfn
& MIGRATE_PFN_VALID
))
153 return pfn_to_page(mpfn
>> MIGRATE_PFN_SHIFT
);
156 static inline unsigned long migrate_pfn(unsigned long pfn
)
158 return (pfn
<< MIGRATE_PFN_SHIFT
) | MIGRATE_PFN_VALID
;
161 enum migrate_vma_direction
{
162 MIGRATE_VMA_SELECT_SYSTEM
= 1 << 0,
163 MIGRATE_VMA_SELECT_DEVICE_PRIVATE
= 1 << 1,
167 struct vm_area_struct
*vma
;
169 * Both src and dst array must be big enough for
170 * (end - start) >> PAGE_SHIFT entries.
172 * The src array must not be modified by the caller after
173 * migrate_vma_setup(), and must not change the dst array after
174 * migrate_vma_pages() returns.
178 unsigned long cpages
;
179 unsigned long npages
;
184 * Set to the owner value also stored in page->pgmap->owner for
185 * migrating out of device private memory. The flags also need to
186 * be set to MIGRATE_VMA_SELECT_DEVICE_PRIVATE.
187 * The caller should always set this field when using mmu notifier
188 * callbacks to avoid device MMU invalidations for device private
189 * pages that are not being migrated.
195 int migrate_vma_setup(struct migrate_vma
*args
);
196 void migrate_vma_pages(struct migrate_vma
*migrate
);
197 void migrate_vma_finalize(struct migrate_vma
*migrate
);
199 #endif /* CONFIG_MIGRATION */
201 #endif /* _LINUX_MIGRATE_H */