[linux-2.6-block.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 int migrate_vmas(struct mm_struct *mm,
		const nodemask_t *from, const nodemask_t *to,
		unsigned long flags);
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 int migrate_vmas(struct mm_struct *mm,
		const nodemask_t *from, const nodemask_t *to,
		unsigned long flags)
{
	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 void wait_migrate_huge_page(struct anon_vma *anon_vma, 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 void wait_migrate_huge_page(struct anon_vma *anon_vma, pmd_t *pmd)
{
}
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
	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
	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);
	11
	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
	18
	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,
	25	MR_NUMA_MISPLACED,
	26	MR_CMA
	27	};
	28
	29	#ifdef CONFIG_MIGRATION
	30
	31	extern void putback_movable_pages(struct list_head *l);
	32	extern int migrate_page(struct address_space *,
	33	struct page , struct page , enum migrate_mode);
	34	extern int migrate_pages(struct list_head *l, new_page_t new, free_page_t free,
	35	unsigned long private, enum migrate_mode mode, int reason);
	36
	37	extern int migrate_prep(void);
	38	extern int migrate_prep_local(void);
	39	extern int migrate_vmas(struct mm_struct *mm,
	40	const nodemask_t from, const nodemask_t to,
	41	unsigned long flags);
	42	extern void migrate_page_copy(struct page newpage, struct page page);
	43	extern int migrate_huge_page_move_mapping(struct address_space *mapping,
	44	struct page newpage, struct page page);
	45	extern int migrate_page_move_mapping(struct address_space *mapping,
	46	struct page newpage, struct page page,
	47	struct buffer_head *head, enum migrate_mode mode,
	48	int extra_count);
	49	#else
	50
	51	static inline void putback_movable_pages(struct list_head *l) {}
	52	static inline int migrate_pages(struct list_head *l, new_page_t new,
	53	free_page_t free, unsigned long private, enum migrate_mode mode,
	54	int reason)
	55	{ return -ENOSYS; }
	56
	57	static inline int migrate_prep(void) { return -ENOSYS; }
	58	static inline int migrate_prep_local(void) { return -ENOSYS; }
	59
	60	static inline int migrate_vmas(struct mm_struct *mm,
	61	const nodemask_t from, const nodemask_t to,
	62	unsigned long flags)
	63	{
	64	return -ENOSYS;
	65	}
	66
	67	static inline void migrate_page_copy(struct page *newpage,
	68	struct page *page) {}
	69
	70	static inline int migrate_huge_page_move_mapping(struct address_space *mapping,
	71	struct page newpage, struct page page)
	72	{
	73	return -ENOSYS;
	74	}
	75
	76	#endif /* CONFIG_MIGRATION */
	77
	78	#ifdef CONFIG_NUMA_BALANCING
	79	extern bool pmd_trans_migrating(pmd_t pmd);
	80	extern void wait_migrate_huge_page(struct anon_vma anon_vma, pmd_t pmd);
	81	extern int migrate_misplaced_page(struct page *page,
	82	struct vm_area_struct *vma, int node);
	83	extern bool migrate_ratelimited(int node);
	84	#else
	85	static inline bool pmd_trans_migrating(pmd_t pmd)
	86	{
	87	return false;
	88	}
	89	static inline void wait_migrate_huge_page(struct anon_vma anon_vma, pmd_t pmd)
	90	{
	91	}
	92	static inline int migrate_misplaced_page(struct page *page,
	93	struct vm_area_struct *vma, int node)
	94	{
	95	return -EAGAIN; /* can't migrate now */
	96	}
	97	static inline bool migrate_ratelimited(int node)
	98	{
	99	return false;
	100	}
	101	#endif /* CONFIG_NUMA_BALANCING */
	102
	103	#if defined(CONFIG_NUMA_BALANCING) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
	104	extern int migrate_misplaced_transhuge_page(struct mm_struct *mm,
	105	struct vm_area_struct *vma,
	106	pmd_t *pmd, pmd_t entry,
	107	unsigned long address,
	108	struct page *page, int node);
	109	#else
	110	static inline int migrate_misplaced_transhuge_page(struct mm_struct *mm,
	111	struct vm_area_struct *vma,
	112	pmd_t *pmd, pmd_t entry,
	113	unsigned long address,
	114	struct page *page, int node)
	115	{
	116	return -EAGAIN;
	117	}
	118	#endif /* CONFIG_NUMA_BALANCING && CONFIG_TRANSPARENT_HUGEPAGE*/
	119
	120	#endif /* _LINUX_MIGRATE_H */