[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,
	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 *,
			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);
#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
	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	MR_TYPES
	28	};
	29
	30	/* In mm/debug.c; also keep sync with include/trace/events/migrate.h */
	31	extern char *migrate_reason_names[MR_TYPES];
	32
	33	#ifdef CONFIG_MIGRATION
	34
	35	extern void putback_movable_pages(struct list_head *l);
	36	extern int migrate_page(struct address_space *,
	37	struct page , struct page , enum migrate_mode);
	38	extern int migrate_pages(struct list_head *l, new_page_t new, free_page_t free,
	39	unsigned long private, enum migrate_mode mode, int reason);
	40
	41	extern int migrate_prep(void);
	42	extern int migrate_prep_local(void);
	43	extern void migrate_page_copy(struct page newpage, struct page page);
	44	extern int migrate_huge_page_move_mapping(struct address_space *mapping,
	45	struct page newpage, struct page page);
	46	extern int migrate_page_move_mapping(struct address_space *mapping,
	47	struct page newpage, struct page page,
	48	struct buffer_head *head, enum migrate_mode mode,
	49	int extra_count);
	50	#else
	51
	52	static inline void putback_movable_pages(struct list_head *l) {}
	53	static inline int migrate_pages(struct list_head *l, new_page_t new,
	54	free_page_t free, unsigned long private, enum migrate_mode mode,
	55	int reason)
	56	{ return -ENOSYS; }
	57
	58	static inline int migrate_prep(void) { return -ENOSYS; }
	59	static inline int migrate_prep_local(void) { return -ENOSYS; }
	60
	61	static inline void migrate_page_copy(struct page *newpage,
	62	struct page *page) {}
	63
	64	static inline int migrate_huge_page_move_mapping(struct address_space *mapping,
	65	struct page newpage, struct page page)
	66	{
	67	return -ENOSYS;
	68	}
	69
	70	#endif /* CONFIG_MIGRATION */
	71
	72	#ifdef CONFIG_NUMA_BALANCING
	73	extern bool pmd_trans_migrating(pmd_t pmd);
	74	extern int migrate_misplaced_page(struct page *page,
	75	struct vm_area_struct *vma, int node);
	76	#else
	77	static inline bool pmd_trans_migrating(pmd_t pmd)
	78	{
	79	return false;
	80	}
	81	static inline int migrate_misplaced_page(struct page *page,
	82	struct vm_area_struct *vma, int node)
	83	{
	84	return -EAGAIN; /* can't migrate now */
	85	}
	86	#endif /* CONFIG_NUMA_BALANCING */
	87
	88	#if defined(CONFIG_NUMA_BALANCING) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
	89	extern int migrate_misplaced_transhuge_page(struct mm_struct *mm,
	90	struct vm_area_struct *vma,
	91	pmd_t *pmd, pmd_t entry,
	92	unsigned long address,
	93	struct page *page, int node);
	94	#else
	95	static inline int migrate_misplaced_transhuge_page(struct mm_struct *mm,
	96	struct vm_area_struct *vma,
	97	pmd_t *pmd, pmd_t entry,
	98	unsigned long address,
	99	struct page *page, int node)
	100	{
	101	return -EAGAIN;
	102	}
	103	#endif /* CONFIG_NUMA_BALANCING && CONFIG_TRANSPARENT_HUGEPAGE*/
	104
	105	#endif /* _LINUX_MIGRATE_H */