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 */
35 /* In mm/debug.c; also keep sync with include/trace/events/migrate.h */
36 extern const char *migrate_reason_names
[MR_TYPES
];
38 #ifdef CONFIG_MIGRATION
40 extern void putback_movable_pages(struct list_head
*l
);
41 extern int migrate_page(struct address_space
*mapping
,
42 struct page
*newpage
, struct page
*page
,
43 enum migrate_mode mode
);
44 extern int migrate_pages(struct list_head
*l
, new_page_t
new, free_page_t free
,
45 unsigned long private, enum migrate_mode mode
, int reason
,
46 unsigned int *ret_succeeded
);
47 extern struct page
*alloc_migration_target(struct page
*page
, unsigned long private);
48 extern int isolate_movable_page(struct page
*page
, isolate_mode_t mode
);
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
,
61 int reason
, unsigned int *ret_succeeded
)
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 void migrate_page_states(struct page
*newpage
, struct page
*page
)
73 static inline void migrate_page_copy(struct page
*newpage
,
76 static inline int migrate_huge_page_move_mapping(struct address_space
*mapping
,
77 struct page
*newpage
, struct page
*page
)
81 #endif /* CONFIG_MIGRATION */
83 #ifdef CONFIG_COMPACTION
84 extern int PageMovable(struct page
*page
);
85 extern void __SetPageMovable(struct page
*page
, struct address_space
*mapping
);
86 extern void __ClearPageMovable(struct page
*page
);
88 static inline int PageMovable(struct page
*page
) { return 0; }
89 static inline void __SetPageMovable(struct page
*page
,
90 struct address_space
*mapping
)
93 static inline void __ClearPageMovable(struct page
*page
)
98 #ifdef CONFIG_NUMA_BALANCING
99 extern int migrate_misplaced_page(struct page
*page
,
100 struct vm_area_struct
*vma
, int node
);
102 static inline int migrate_misplaced_page(struct page
*page
,
103 struct vm_area_struct
*vma
, int node
)
105 return -EAGAIN
; /* can't migrate now */
107 #endif /* CONFIG_NUMA_BALANCING */
109 #ifdef CONFIG_MIGRATION
112 * Watch out for PAE architecture, which has an unsigned long, and might not
113 * have enough bits to store all physical address and flags. So far we have
114 * enough room for all our flags.
116 #define MIGRATE_PFN_VALID (1UL << 0)
117 #define MIGRATE_PFN_MIGRATE (1UL << 1)
118 #define MIGRATE_PFN_LOCKED (1UL << 2)
119 #define MIGRATE_PFN_WRITE (1UL << 3)
120 #define MIGRATE_PFN_SHIFT 6
122 static inline struct page
*migrate_pfn_to_page(unsigned long mpfn
)
124 if (!(mpfn
& MIGRATE_PFN_VALID
))
126 return pfn_to_page(mpfn
>> MIGRATE_PFN_SHIFT
);
129 static inline unsigned long migrate_pfn(unsigned long pfn
)
131 return (pfn
<< MIGRATE_PFN_SHIFT
) | MIGRATE_PFN_VALID
;
134 enum migrate_vma_direction
{
135 MIGRATE_VMA_SELECT_SYSTEM
= 1 << 0,
136 MIGRATE_VMA_SELECT_DEVICE_PRIVATE
= 1 << 1,
140 struct vm_area_struct
*vma
;
142 * Both src and dst array must be big enough for
143 * (end - start) >> PAGE_SHIFT entries.
145 * The src array must not be modified by the caller after
146 * migrate_vma_setup(), and must not change the dst array after
147 * migrate_vma_pages() returns.
151 unsigned long cpages
;
152 unsigned long npages
;
157 * Set to the owner value also stored in page->pgmap->owner for
158 * migrating out of device private memory. The flags also need to
159 * be set to MIGRATE_VMA_SELECT_DEVICE_PRIVATE.
160 * The caller should always set this field when using mmu notifier
161 * callbacks to avoid device MMU invalidations for device private
162 * pages that are not being migrated.
168 int migrate_vma_setup(struct migrate_vma
*args
);
169 void migrate_vma_pages(struct migrate_vma
*migrate
);
170 void migrate_vma_finalize(struct migrate_vma
*migrate
);
171 int next_demotion_node(int node
);
173 #else /* CONFIG_MIGRATION disabled: */
175 static inline int next_demotion_node(int node
)
180 #endif /* CONFIG_MIGRATION */
182 #endif /* _LINUX_MIGRATE_H */