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Christoph Lameterb20a3502006-03-22 00:09:12 -08001#ifndef _LINUX_MIGRATE_H
2#define _LINUX_MIGRATE_H
3
Christoph Lameterb20a3502006-03-22 00:09:12 -08004#include <linux/mm.h>
Christoph Lameter906e0be2007-05-06 14:50:20 -07005#include <linux/mempolicy.h>
Andrew Morton6536e312012-01-20 14:33:53 -08006#include <linux/migrate_mode.h>
Christoph Lameterb20a3502006-03-22 00:09:12 -08007
Christoph Lameter742755a2006-06-23 02:03:55 -07008typedef struct page *new_page_t(struct page *, unsigned long private, int **);
Christoph Lameter95a402c2006-06-23 02:03:53 -07009
Rafael Aquini78bd5202012-12-11 16:02:31 -080010/*
11 * Return values from addresss_space_operations.migratepage():
12 * - negative errno on page migration failure;
13 * - zero on page migration success;
Rafael Aquini18468d92012-12-11 16:02:38 -080014 *
15 * The balloon page migration introduces this special case where a 'distinct'
16 * return code is used to flag a successful page migration to unmap_and_move().
17 * This approach is necessary because page migration can race against balloon
18 * deflation procedure, and for such case we could introduce a nasty page leak
19 * if a successfully migrated balloon page gets released concurrently with
20 * migration's unmap_and_move() wrap-up steps.
Rafael Aquini78bd5202012-12-11 16:02:31 -080021 */
22#define MIGRATEPAGE_SUCCESS 0
Rafael Aquini18468d92012-12-11 16:02:38 -080023#define MIGRATEPAGE_BALLOON_SUCCESS 1 /* special ret code for balloon page
24 * sucessful migration case.
25 */
Mel Gorman7b2a2d42012-10-19 14:07:31 +010026enum migrate_reason {
27 MR_COMPACTION,
28 MR_MEMORY_FAILURE,
29 MR_MEMORY_HOTPLUG,
30 MR_SYSCALL, /* also applies to cpusets */
31 MR_MEMPOLICY_MBIND,
Peter Zijlstra7039e1d2012-10-25 14:16:34 +020032 MR_NUMA_MISPLACED,
Mel Gorman7b2a2d42012-10-19 14:07:31 +010033 MR_CMA
34};
Rafael Aquini78bd5202012-12-11 16:02:31 -080035
Christoph Lameter906e0be2007-05-06 14:50:20 -070036#ifdef CONFIG_MIGRATION
KOSAKI Motohiro64cdd542009-01-06 14:39:16 -080037
Minchan Kime13861d2010-05-24 14:31:59 -070038extern void putback_lru_pages(struct list_head *l);
Rafael Aquini5733c7d2012-12-11 16:02:47 -080039extern void putback_movable_pages(struct list_head *l);
Christoph Lameter2d1db3b2006-06-23 02:03:33 -070040extern int migrate_page(struct address_space *,
Mel Gormana6bc32b2012-01-12 17:19:43 -080041 struct page *, struct page *, enum migrate_mode);
Hugh Dickins62b61f62009-12-14 17:59:33 -080042extern int migrate_pages(struct list_head *l, new_page_t x,
Hugh Dickins9c620e22013-02-22 16:35:14 -080043 unsigned long private, enum migrate_mode mode, int reason);
Christoph Lameter95a402c2006-06-23 02:03:53 -070044
Christoph Lameter2d1db3b2006-06-23 02:03:33 -070045extern int fail_migrate_page(struct address_space *,
46 struct page *, struct page *);
Christoph Lameterb20a3502006-03-22 00:09:12 -080047
48extern int migrate_prep(void);
Mel Gorman748446b2010-05-24 14:32:27 -070049extern int migrate_prep_local(void);
Christoph Lameter7b2259b2006-06-25 05:46:48 -070050extern int migrate_vmas(struct mm_struct *mm,
51 const nodemask_t *from, const nodemask_t *to,
52 unsigned long flags);
Naoya Horiguchi290408d2010-09-08 10:19:35 +090053extern void migrate_page_copy(struct page *newpage, struct page *page);
54extern int migrate_huge_page_move_mapping(struct address_space *mapping,
55 struct page *newpage, struct page *page);
Gu Zheng36bc08c2013-07-16 17:56:16 +080056extern int migrate_page_move_mapping(struct address_space *mapping,
57 struct page *newpage, struct page *page,
58 struct buffer_head *head, enum migrate_mode mode);
Christoph Lameterb20a3502006-03-22 00:09:12 -080059#else
KOSAKI Motohiro64cdd542009-01-06 14:39:16 -080060
Minchan Kime13861d2010-05-24 14:31:59 -070061static inline void putback_lru_pages(struct list_head *l) {}
Rafael Aquini5733c7d2012-12-11 16:02:47 -080062static inline void putback_movable_pages(struct list_head *l) {}
Christoph Lameter95a402c2006-06-23 02:03:53 -070063static inline int migrate_pages(struct list_head *l, new_page_t x,
Hugh Dickins9c620e22013-02-22 16:35:14 -080064 unsigned long private, enum migrate_mode mode, int reason)
65 { return -ENOSYS; }
Christoph Lameter9bf9e892006-03-31 02:29:56 -080066
Christoph Lameterb20a3502006-03-22 00:09:12 -080067static inline int migrate_prep(void) { return -ENOSYS; }
Mel Gorman748446b2010-05-24 14:32:27 -070068static inline int migrate_prep_local(void) { return -ENOSYS; }
Christoph Lameterb20a3502006-03-22 00:09:12 -080069
Christoph Lameter7b2259b2006-06-25 05:46:48 -070070static inline int migrate_vmas(struct mm_struct *mm,
71 const nodemask_t *from, const nodemask_t *to,
72 unsigned long flags)
73{
74 return -ENOSYS;
75}
76
Naoya Horiguchi290408d2010-09-08 10:19:35 +090077static inline void migrate_page_copy(struct page *newpage,
78 struct page *page) {}
79
Naoya Horiguchi6f39ce02010-09-30 11:54:51 +090080static inline int migrate_huge_page_move_mapping(struct address_space *mapping,
Naoya Horiguchi290408d2010-09-08 10:19:35 +090081 struct page *newpage, struct page *page)
82{
83 return -ENOSYS;
84}
85
Christoph Lameterb20a3502006-03-22 00:09:12 -080086/* Possible settings for the migrate_page() method in address_operations */
87#define migrate_page NULL
88#define fail_migrate_page NULL
89
90#endif /* CONFIG_MIGRATION */
Peter Zijlstra7039e1d2012-10-25 14:16:34 +020091
92#ifdef CONFIG_NUMA_BALANCING
93extern int migrate_misplaced_page(struct page *page, int node);
Mel Gormane14808b2012-11-19 10:59:15 +000094extern int migrate_misplaced_page(struct page *page, int node);
95extern bool migrate_ratelimited(int node);
Peter Zijlstra7039e1d2012-10-25 14:16:34 +020096#else
97static inline int migrate_misplaced_page(struct page *page, int node)
98{
99 return -EAGAIN; /* can't migrate now */
100}
Mel Gormane14808b2012-11-19 10:59:15 +0000101static inline bool migrate_ratelimited(int node)
102{
103 return false;
104}
Mel Gorman220018d2012-12-05 09:32:56 +0000105#endif /* CONFIG_NUMA_BALANCING */
Mel Gormanb32967f2012-11-19 12:35:47 +0000106
Mel Gorman220018d2012-12-05 09:32:56 +0000107#if defined(CONFIG_NUMA_BALANCING) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
108extern int migrate_misplaced_transhuge_page(struct mm_struct *mm,
109 struct vm_area_struct *vma,
110 pmd_t *pmd, pmd_t entry,
111 unsigned long address,
112 struct page *page, int node);
113#else
Mel Gormanb32967f2012-11-19 12:35:47 +0000114static inline int migrate_misplaced_transhuge_page(struct mm_struct *mm,
115 struct vm_area_struct *vma,
116 pmd_t *pmd, pmd_t entry,
117 unsigned long address,
118 struct page *page, int node)
119{
120 return -EAGAIN;
121}
Mel Gorman220018d2012-12-05 09:32:56 +0000122#endif /* CONFIG_NUMA_BALANCING && CONFIG_TRANSPARENT_HUGEPAGE*/
Peter Zijlstra7039e1d2012-10-25 14:16:34 +0200123
Christoph Lameterb20a3502006-03-22 00:09:12 -0800124#endif /* _LINUX_MIGRATE_H */