[deliverable/linux.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
};

#ifdef CONFIG_MIGRATION

extern void putback_movable_pages(struct list_head *l);
extern int migrate_page(struct address_space *,
			struct page *, struct page *, enum migrate_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 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 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_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);
extern bool migrate_ratelimited(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 */
}
static inline bool migrate_ratelimited(int node)
{
	return false;
}
#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,
7b2a2d4a MG	26	MR_CMA
7b2a2d4a MG	27	};
78bd5209	28
906e0be1	29	#ifdef CONFIG_MIGRATION
64cdd548	30
5733c7d1	31	extern void putback_movable_pages(struct list_head *l);
2d1db3b1	32	extern int migrate_page(struct address_space *,
a6bc32b8	33	struct page , struct page , enum migrate_mode);
68711a74	34	extern int migrate_pages(struct list_head *l, new_page_t new, free_page_t free,
9c620e2b	35	unsigned long private, enum migrate_mode mode, int reason);
95a402c3	36
b20a3503	37	extern int migrate_prep(void);
748446bb	38	extern int migrate_prep_local(void);
290408d4 NH	39	extern void migrate_page_copy(struct page newpage, struct page page);
	40	extern int migrate_huge_page_move_mapping(struct address_space *mapping,
	41	struct page newpage, struct page page);
36bc08cc GZ	42	extern int migrate_page_move_mapping(struct address_space *mapping,
36bc08cc GZ	43	struct page newpage, struct page page,
8e321fef BL	44	struct buffer_head *head, enum migrate_mode mode,
8e321fef BL	45	int extra_count);
b20a3503	46	#else
64cdd548	47
5733c7d1	48	static inline void putback_movable_pages(struct list_head *l) {}
68711a74 DR	49	static inline int migrate_pages(struct list_head *l, new_page_t new,
	50	free_page_t free, unsigned long private, enum migrate_mode mode,
	51	int reason)
9c620e2b	52	{ return -ENOSYS; }
9bf9e89c	53
b20a3503	54	static inline int migrate_prep(void) { return -ENOSYS; }
748446bb	55	static inline int migrate_prep_local(void) { return -ENOSYS; }
b20a3503	56
290408d4 NH	57	static inline void migrate_page_copy(struct page *newpage,
	58	struct page *page) {}
	59
6f39ce05	60	static inline int migrate_huge_page_move_mapping(struct address_space *mapping,
290408d4 NH	61	struct page newpage, struct page page)
	62	{
	63	return -ENOSYS;
	64	}
	65
b20a3503	66	#endif /* CONFIG_MIGRATION */
7039e1db PZ	67
7039e1db PZ	68	#ifdef CONFIG_NUMA_BALANCING
de466bd6	69	extern bool pmd_trans_migrating(pmd_t pmd);
1bc115d8 MG	70	extern int migrate_misplaced_page(struct page *page,
1bc115d8 MG	71	struct vm_area_struct *vma, int node);
e14808b4	72	extern bool migrate_ratelimited(int node);
7039e1db	73	#else
de466bd6 MG	74	static inline bool pmd_trans_migrating(pmd_t pmd)
	75	{
	76	return false;
	77	}
1bc115d8 MG	78	static inline int migrate_misplaced_page(struct page *page,
1bc115d8 MG	79	struct vm_area_struct *vma, int node)
7039e1db PZ	80	{
	81	return -EAGAIN; /* can't migrate now */
	82	}
e14808b4 MG	83	static inline bool migrate_ratelimited(int node)
	84	{
	85	return false;
	86	}
220018d3	87	#endif /* CONFIG_NUMA_BALANCING */
b32967ff	88
220018d3 MG	89	#if defined(CONFIG_NUMA_BALANCING) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
	90	extern int migrate_misplaced_transhuge_page(struct mm_struct *mm,
	91	struct vm_area_struct *vma,
	92	pmd_t *pmd, pmd_t entry,
	93	unsigned long address,
	94	struct page *page, int node);
	95	#else
b32967ff MG	96	static inline int migrate_misplaced_transhuge_page(struct mm_struct *mm,
	97	struct vm_area_struct *vma,
	98	pmd_t *pmd, pmd_t entry,
	99	unsigned long address,
	100	struct page *page, int node)
	101	{
	102	return -EAGAIN;
	103	}
220018d3	104	#endif /* CONFIG_NUMA_BALANCING && CONFIG_TRANSPARENT_HUGEPAGE*/
7039e1db	105
b20a3503	106	#endif /* _LINUX_MIGRATE_H */