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);
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 const 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;
38 unsigned int order = 0;
39 struct page *new_page = NULL;
42 return alloc_huge_page_nodemask(page_hstate(compound_head(page)),
43 preferred_nid, nodemask);
45 if (PageTransHuge(page)) {
46 gfp_mask |= GFP_TRANSHUGE;
47 order = HPAGE_PMD_ORDER;
50 if (PageHighMem(page) || (zone_idx(page_zone(page)) == ZONE_MOVABLE))
51 gfp_mask |= __GFP_HIGHMEM;
53 new_page = __alloc_pages_nodemask(gfp_mask, order,
54 preferred_nid, nodemask);
56 if (new_page && PageTransHuge(new_page))
57 prep_transhuge_page(new_page);
62 #ifdef CONFIG_MIGRATION
64 extern void putback_movable_pages(struct list_head *l);
65 extern int migrate_page(struct address_space *mapping,
66 struct page *newpage, struct page *page,
67 enum migrate_mode mode);
68 extern int migrate_pages(struct list_head *l, new_page_t new, free_page_t free,
69 unsigned long private, enum migrate_mode mode, int reason);
70 extern int isolate_movable_page(struct page *page, isolate_mode_t mode);
71 extern void putback_movable_page(struct page *page);
73 extern int migrate_prep(void);
74 extern int migrate_prep_local(void);
75 extern void migrate_page_states(struct page *newpage, struct page *page);
76 extern void migrate_page_copy(struct page *newpage, struct page *page);
77 extern int migrate_huge_page_move_mapping(struct address_space *mapping,
78 struct page *newpage, struct page *page);
79 extern int migrate_page_move_mapping(struct address_space *mapping,
80 struct page *newpage, struct page *page, int extra_count);
83 static inline void putback_movable_pages(struct list_head *l) {}
84 static inline int migrate_pages(struct list_head *l, new_page_t new,
85 free_page_t free, unsigned long private, enum migrate_mode mode,
88 static inline int isolate_movable_page(struct page *page, isolate_mode_t mode)
91 static inline int migrate_prep(void) { return -ENOSYS; }
92 static inline int migrate_prep_local(void) { return -ENOSYS; }
94 static inline void migrate_page_states(struct page *newpage, struct page *page)
98 static inline void migrate_page_copy(struct page *newpage,
101 static inline int migrate_huge_page_move_mapping(struct address_space *mapping,
102 struct page *newpage, struct page *page)
107 #endif /* CONFIG_MIGRATION */
109 #ifdef CONFIG_COMPACTION
110 extern int PageMovable(struct page *page);
111 extern void __SetPageMovable(struct page *page, struct address_space *mapping);
112 extern void __ClearPageMovable(struct page *page);
114 static inline int PageMovable(struct page *page) { return 0; };
115 static inline void __SetPageMovable(struct page *page,
116 struct address_space *mapping)
119 static inline void __ClearPageMovable(struct page *page)
124 #ifdef CONFIG_NUMA_BALANCING
125 extern bool pmd_trans_migrating(pmd_t pmd);
126 extern int migrate_misplaced_page(struct page *page,
127 struct vm_area_struct *vma, int node);
129 static inline bool pmd_trans_migrating(pmd_t pmd)
133 static inline int migrate_misplaced_page(struct page *page,
134 struct vm_area_struct *vma, int node)
136 return -EAGAIN; /* can't migrate now */
138 #endif /* CONFIG_NUMA_BALANCING */
140 #if defined(CONFIG_NUMA_BALANCING) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
141 extern int migrate_misplaced_transhuge_page(struct mm_struct *mm,
142 struct vm_area_struct *vma,
143 pmd_t *pmd, pmd_t entry,
144 unsigned long address,
145 struct page *page, int node);
147 static inline int migrate_misplaced_transhuge_page(struct mm_struct *mm,
148 struct vm_area_struct *vma,
149 pmd_t *pmd, pmd_t entry,
150 unsigned long address,
151 struct page *page, int node)
155 #endif /* CONFIG_NUMA_BALANCING && CONFIG_TRANSPARENT_HUGEPAGE*/
158 #ifdef CONFIG_MIGRATION
161 * Watch out for PAE architecture, which has an unsigned long, and might not
162 * have enough bits to store all physical address and flags. So far we have
163 * enough room for all our flags.
165 #define MIGRATE_PFN_VALID (1UL << 0)
166 #define MIGRATE_PFN_MIGRATE (1UL << 1)
167 #define MIGRATE_PFN_LOCKED (1UL << 2)
168 #define MIGRATE_PFN_WRITE (1UL << 3)
169 #define MIGRATE_PFN_SHIFT 6
171 static inline struct page *migrate_pfn_to_page(unsigned long mpfn)
173 if (!(mpfn & MIGRATE_PFN_VALID))
175 return pfn_to_page(mpfn >> MIGRATE_PFN_SHIFT);
178 static inline unsigned long migrate_pfn(unsigned long pfn)
180 return (pfn << MIGRATE_PFN_SHIFT) | MIGRATE_PFN_VALID;
184 struct vm_area_struct *vma;
186 * Both src and dst array must be big enough for
187 * (end - start) >> PAGE_SHIFT entries.
189 * The src array must not be modified by the caller after
190 * migrate_vma_setup(), and must not change the dst array after
191 * migrate_vma_pages() returns.
195 unsigned long cpages;
196 unsigned long npages;
201 * Set to the owner value also stored in page->pgmap->owner for
202 * migrating out of device private memory. If set only device
203 * private pages with this owner are migrated. If not set
204 * device private pages are not migrated at all.
209 int migrate_vma_setup(struct migrate_vma *args);
210 void migrate_vma_pages(struct migrate_vma *migrate);
211 void migrate_vma_finalize(struct migrate_vma *migrate);
213 #endif /* CONFIG_MIGRATION */
215 #endif /* _LINUX_MIGRATE_H */