Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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#include <linux/hugetlb.h>
8
9typedef struct page *new_page_t(struct page *page, unsigned long private,
10 int **reason);
11typedef void free_page_t(struct page *page, unsigned long private);
12
13/*
14 * Return values from addresss_space_operations.migratepage():
15 * - negative errno on page migration failure;
16 * - zero on page migration success;
17 */
18#define MIGRATEPAGE_SUCCESS 0
19
20enum migrate_reason {
21 MR_COMPACTION,
22 MR_MEMORY_FAILURE,
23 MR_MEMORY_HOTPLUG,
24 MR_SYSCALL, /* also applies to cpusets */
25 MR_MEMPOLICY_MBIND,
26 MR_NUMA_MISPLACED,
27 MR_CMA,
28 MR_TYPES
29};
30
31/* In mm/debug.c; also keep sync with include/trace/events/migrate.h */
32extern char *migrate_reason_names[MR_TYPES];
33
34static inline struct page *new_page_nodemask(struct page *page,
35 int preferred_nid, nodemask_t *nodemask)
36{
37 gfp_t gfp_mask = GFP_USER | __GFP_MOVABLE | __GFP_RETRY_MAYFAIL;
38
39 if (PageHuge(page))
40 return alloc_huge_page_nodemask(page_hstate(compound_head(page)),
41 preferred_nid, nodemask);
42
43 if (PageHighMem(page) || (zone_idx(page_zone(page)) == ZONE_MOVABLE))
44 gfp_mask |= __GFP_HIGHMEM;
45
46 return __alloc_pages_nodemask(gfp_mask, 0, preferred_nid, nodemask);
47}
48
49#ifdef CONFIG_MIGRATION
50
51extern void putback_movable_pages(struct list_head *l);
52extern int migrate_page(struct address_space *mapping,
53 struct page *newpage, struct page *page,
54 enum migrate_mode mode);
55extern int migrate_pages(struct list_head *l, new_page_t new, free_page_t free,
56 unsigned long private, enum migrate_mode mode, int reason);
57extern int isolate_movable_page(struct page *page, isolate_mode_t mode);
58extern void putback_movable_page(struct page *page);
59
60extern int migrate_prep(void);
61extern int migrate_prep_local(void);
62extern void migrate_page_copy(struct page *newpage, struct page *page);
63extern int migrate_huge_page_move_mapping(struct address_space *mapping,
64 struct page *newpage, struct page *page);
65extern int migrate_page_move_mapping(struct address_space *mapping,
66 struct page *newpage, struct page *page,
67 struct buffer_head *head, enum migrate_mode mode,
68 int extra_count);
69#else
70
71static inline void putback_movable_pages(struct list_head *l) {}
72static inline int migrate_pages(struct list_head *l, new_page_t new,
73 free_page_t free, unsigned long private, enum migrate_mode mode,
74 int reason)
75 { return -ENOSYS; }
76static inline int isolate_movable_page(struct page *page, isolate_mode_t mode)
77 { return -EBUSY; }
78
79static inline int migrate_prep(void) { return -ENOSYS; }
80static inline int migrate_prep_local(void) { return -ENOSYS; }
81
82static inline void migrate_page_copy(struct page *newpage,
83 struct page *page) {}
84
85static inline int migrate_huge_page_move_mapping(struct address_space *mapping,
86 struct page *newpage, struct page *page)
87{
88 return -ENOSYS;
89}
90
91#endif /* CONFIG_MIGRATION */
92
93#ifdef CONFIG_COMPACTION
94extern int PageMovable(struct page *page);
95extern void __SetPageMovable(struct page *page, struct address_space *mapping);
96extern void __ClearPageMovable(struct page *page);
97#else
98static inline int PageMovable(struct page *page) { return 0; };
99static inline void __SetPageMovable(struct page *page,
100 struct address_space *mapping)
101{
102}
103static inline void __ClearPageMovable(struct page *page)
104{
105}
106#endif
107
108#ifdef CONFIG_NUMA_BALANCING
109extern bool pmd_trans_migrating(pmd_t pmd);
110extern int migrate_misplaced_page(struct page *page,
111 struct vm_area_struct *vma, int node);
112#else
113static inline bool pmd_trans_migrating(pmd_t pmd)
114{
115 return false;
116}
117static inline int migrate_misplaced_page(struct page *page,
118 struct vm_area_struct *vma, int node)
119{
120 return -EAGAIN; /* can't migrate now */
121}
122#endif /* CONFIG_NUMA_BALANCING */
123
124#if defined(CONFIG_NUMA_BALANCING) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
125extern 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);
130#else
131static inline int migrate_misplaced_transhuge_page(struct mm_struct *mm,
132 struct vm_area_struct *vma,
133 pmd_t *pmd, pmd_t entry,
134 unsigned long address,
135 struct page *page, int node)
136{
137 return -EAGAIN;
138}
139#endif /* CONFIG_NUMA_BALANCING && CONFIG_TRANSPARENT_HUGEPAGE*/
140
141#endif /* _LINUX_MIGRATE_H */