[mirror_ubuntu-artful-kernel.git] / include / linux / migrate.h

#ifndef _LINUX_MIGRATE_H
#define _LINUX_MIGRATE_H

#include <linux/mm.h>
#include <linux/mempolicy.h>
#include <linux/migrate_mode.h>

typedef struct page *new_page_t(struct page *page, unsigned long private,
				int **reason);
typedef void free_page_t(struct page *page, unsigned long private);

/*
 * Return values from addresss_space_operations.migratepage():
 * - negative errno on page migration failure;
 * - zero on page migration success;
 */
#define MIGRATEPAGE_SUCCESS		0

enum migrate_reason {
	MR_COMPACTION,
	MR_MEMORY_FAILURE,
	MR_MEMORY_HOTPLUG,
	MR_SYSCALL,		/* also applies to cpusets */
	MR_MEMPOLICY_MBIND,
	MR_NUMA_MISPLACED,
	MR_CMA,
	MR_TYPES
};

/* In mm/debug.c; also keep sync with include/trace/events/migrate.h */
extern char *migrate_reason_names[MR_TYPES];

#ifdef CONFIG_MIGRATION

extern void putback_movable_pages(struct list_head *l);
extern int migrate_page(struct address_space *mapping,
			struct page *newpage, struct page *page,
			enum migrate_mode mode);
extern int migrate_pages(struct list_head *l, new_page_t new, free_page_t free,
		unsigned long private, enum migrate_mode mode, int reason);
extern int isolate_movable_page(struct page *page, isolate_mode_t mode);
extern void putback_movable_page(struct page *page);

extern int migrate_prep(void);
extern int migrate_prep_local(void);
extern void migrate_page_copy(struct page *newpage, struct page *page);
extern int migrate_huge_page_move_mapping(struct address_space *mapping,
				  struct page *newpage, struct page *page);
extern int migrate_page_move_mapping(struct address_space *mapping,
		struct page *newpage, struct page *page,
		struct buffer_head *head, enum migrate_mode mode,
		int extra_count);
#else

static inline void putback_movable_pages(struct list_head *l) {}
static inline int migrate_pages(struct list_head *l, new_page_t new,
		free_page_t free, unsigned long private, enum migrate_mode mode,
		int reason)
	{ return -ENOSYS; }
static inline int isolate_movable_page(struct page *page, isolate_mode_t mode)
	{ return -EBUSY; }

static inline int migrate_prep(void) { return -ENOSYS; }
static inline int migrate_prep_local(void) { return -ENOSYS; }

static inline void migrate_page_copy(struct page *newpage,
				     struct page *page) {}

static inline int migrate_huge_page_move_mapping(struct address_space *mapping,
				  struct page *newpage, struct page *page)
{
	return -ENOSYS;
}

#endif /* CONFIG_MIGRATION */

#ifdef CONFIG_COMPACTION
extern int PageMovable(struct page *page);
extern void __SetPageMovable(struct page *page, struct address_space *mapping);
extern void __ClearPageMovable(struct page *page);
#else
static inline int PageMovable(struct page *page) { return 0; };
static inline void __SetPageMovable(struct page *page,
				struct address_space *mapping)
{
}
static inline void __ClearPageMovable(struct page *page)
{
}
#endif

#ifdef CONFIG_NUMA_BALANCING
extern bool pmd_trans_migrating(pmd_t pmd);
extern int migrate_misplaced_page(struct page *page,
				  struct vm_area_struct *vma, int node);
#else
static inline bool pmd_trans_migrating(pmd_t pmd)
{
	return false;
}
static inline int migrate_misplaced_page(struct page *page,
					 struct vm_area_struct *vma, int node)
{
	return -EAGAIN; /* can't migrate now */
}
#endif /* CONFIG_NUMA_BALANCING */

#if defined(CONFIG_NUMA_BALANCING) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
extern int migrate_misplaced_transhuge_page(struct mm_struct *mm,
			struct vm_area_struct *vma,
			pmd_t *pmd, pmd_t entry,
			unsigned long address,
			struct page *page, int node);
#else
static inline int migrate_misplaced_transhuge_page(struct mm_struct *mm,
			struct vm_area_struct *vma,
			pmd_t *pmd, pmd_t entry,
			unsigned long address,
			struct page *page, int node)
{
	return -EAGAIN;
}
#endif /* CONFIG_NUMA_BALANCING && CONFIG_TRANSPARENT_HUGEPAGE*/

#endif /* _LINUX_MIGRATE_H */
Commit	Line	Data
b20a3503 CL	1	#ifndef _LINUX_MIGRATE_H
	2	#define _LINUX_MIGRATE_H
	3
b20a3503	4	#include <linux/mm.h>
906e0be1	5	#include <linux/mempolicy.h>
6536e312	6	#include <linux/migrate_mode.h>
b20a3503	7
68711a74 DR	8	typedef struct page new_page_t(struct page page, unsigned long private,
	9	int **reason);
	10	typedef void free_page_t(struct page *page, unsigned long private);
95a402c3	11
78bd5209 RA	12	/*
	13	* Return values from addresss_space_operations.migratepage():
	14	* - negative errno on page migration failure;
	15	* - zero on page migration success;
	16	*/
	17	#define MIGRATEPAGE_SUCCESS 0
d6d86c0a	18
7b2a2d4a MG	19	enum migrate_reason {
	20	MR_COMPACTION,
	21	MR_MEMORY_FAILURE,
	22	MR_MEMORY_HOTPLUG,
	23	MR_SYSCALL, /* also applies to cpusets */
	24	MR_MEMPOLICY_MBIND,
7039e1db	25	MR_NUMA_MISPLACED,
7cd12b4a VB	26	MR_CMA,
7cd12b4a VB	27	MR_TYPES
7b2a2d4a	28	};
78bd5209	29
7cd12b4a VB	30	/* In mm/debug.c; also keep sync with include/trace/events/migrate.h */
	31	extern char *migrate_reason_names[MR_TYPES];
	32
906e0be1	33	#ifdef CONFIG_MIGRATION
64cdd548	34
5733c7d1	35	extern void putback_movable_pages(struct list_head *l);
9927e388 PJ	36	extern int migrate_page(struct address_space *mapping,
	37	struct page newpage, struct page page,
	38	enum migrate_mode mode);
68711a74	39	extern int migrate_pages(struct list_head *l, new_page_t new, free_page_t free,
9c620e2b	40	unsigned long private, enum migrate_mode mode, int reason);
9e5bcd61	41	extern int isolate_movable_page(struct page *page, isolate_mode_t mode);
bda807d4	42	extern void putback_movable_page(struct page *page);
95a402c3	43
b20a3503	44	extern int migrate_prep(void);
748446bb	45	extern int migrate_prep_local(void);
290408d4 NH	46	extern void migrate_page_copy(struct page newpage, struct page page);
	47	extern int migrate_huge_page_move_mapping(struct address_space *mapping,
	48	struct page newpage, struct page page);
36bc08cc GZ	49	extern int migrate_page_move_mapping(struct address_space *mapping,
36bc08cc GZ	50	struct page newpage, struct page page,
8e321fef BL	51	struct buffer_head *head, enum migrate_mode mode,
8e321fef BL	52	int extra_count);
b20a3503	53	#else
64cdd548	54
5733c7d1	55	static inline void putback_movable_pages(struct list_head *l) {}
68711a74 DR	56	static inline int migrate_pages(struct list_head *l, new_page_t new,
	57	free_page_t free, unsigned long private, enum migrate_mode mode,
	58	int reason)
9c620e2b	59	{ return -ENOSYS; }
cbae0170 YX	60	static inline int isolate_movable_page(struct page *page, isolate_mode_t mode)
cbae0170 YX	61	{ return -EBUSY; }
9bf9e89c	62
b20a3503	63	static inline int migrate_prep(void) { return -ENOSYS; }
748446bb	64	static inline int migrate_prep_local(void) { return -ENOSYS; }
b20a3503	65
290408d4 NH	66	static inline void migrate_page_copy(struct page *newpage,
	67	struct page *page) {}
	68
6f39ce05	69	static inline int migrate_huge_page_move_mapping(struct address_space *mapping,
290408d4 NH	70	struct page newpage, struct page page)
	71	{
	72	return -ENOSYS;
	73	}
	74
b20a3503	75	#endif /* CONFIG_MIGRATION */
7039e1db	76
dd4123f3 MK	77	#ifdef CONFIG_COMPACTION
	78	extern int PageMovable(struct page *page);
	79	extern void __SetPageMovable(struct page page, struct address_space mapping);
	80	extern void __ClearPageMovable(struct page *page);
	81	#else
	82	static inline int PageMovable(struct page *page) { return 0; };
	83	static inline void __SetPageMovable(struct page *page,
	84	struct address_space *mapping)
	85	{
	86	}
	87	static inline void __ClearPageMovable(struct page *page)
	88	{
	89	}
	90	#endif
	91
7039e1db	92	#ifdef CONFIG_NUMA_BALANCING
de466bd6	93	extern bool pmd_trans_migrating(pmd_t pmd);
1bc115d8 MG	94	extern int migrate_misplaced_page(struct page *page,
1bc115d8 MG	95	struct vm_area_struct *vma, int node);
7039e1db	96	#else
de466bd6 MG	97	static inline bool pmd_trans_migrating(pmd_t pmd)
	98	{
	99	return false;
	100	}
1bc115d8 MG	101	static inline int migrate_misplaced_page(struct page *page,
1bc115d8 MG	102	struct vm_area_struct *vma, int node)
7039e1db PZ	103	{
	104	return -EAGAIN; /* can't migrate now */
	105	}
220018d3	106	#endif /* CONFIG_NUMA_BALANCING */
b32967ff	107
220018d3 MG	108	#if defined(CONFIG_NUMA_BALANCING) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
	109	extern int migrate_misplaced_transhuge_page(struct mm_struct *mm,
	110	struct vm_area_struct *vma,
	111	pmd_t *pmd, pmd_t entry,
	112	unsigned long address,
	113	struct page *page, int node);
	114	#else
b32967ff MG	115	static inline int migrate_misplaced_transhuge_page(struct mm_struct *mm,
	116	struct vm_area_struct *vma,
	117	pmd_t *pmd, pmd_t entry,
	118	unsigned long address,
	119	struct page *page, int node)
	120	{
	121	return -EAGAIN;
	122	}
220018d3	123	#endif /* CONFIG_NUMA_BALANCING && CONFIG_TRANSPARENT_HUGEPAGE*/
7039e1db	124
b20a3503	125	#endif /* _LINUX_MIGRATE_H */