[linux-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 *, unsigned long private, int **);

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_lru_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 x,
			unsigned long private, bool offlining,
			enum migrate_mode mode, int reason);
extern int migrate_huge_page(struct page *, new_page_t x,
			unsigned long private, bool offlining,
			enum migrate_mode mode);

extern int fail_migrate_page(struct address_space *,
			struct page *, struct page *);

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);
#else

static inline void putback_lru_pages(struct list_head *l) {}
static inline int migrate_pages(struct list_head *l, new_page_t x,
		unsigned long private, bool offlining,
		enum migrate_mode mode, int reason) { return -ENOSYS; }
static inline int migrate_huge_page(struct page *page, new_page_t x,
		unsigned long private, bool offlining,
		enum migrate_mode mode) { 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;
}

/* Possible settings for the migrate_page() method in address_operations */
#define migrate_page NULL
#define fail_migrate_page NULL

#endif /* CONFIG_MIGRATION */

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

#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
742755a1	8	typedef struct page new_page_t(struct page , unsigned long private, int **);
95a402c3	9
7b2a2d4a MG	10	enum migrate_reason {
	11	MR_COMPACTION,
	12	MR_MEMORY_FAILURE,
	13	MR_MEMORY_HOTPLUG,
	14	MR_SYSCALL, /* also applies to cpusets */
	15	MR_MEMPOLICY_MBIND,
7039e1db	16	MR_NUMA_MISPLACED,
7b2a2d4a MG	17	MR_CMA
	18	};
	19
906e0be1	20	#ifdef CONFIG_MIGRATION
64cdd548	21
e13861d8	22	extern void putback_lru_pages(struct list_head *l);
2d1db3b1	23	extern int migrate_page(struct address_space *,
a6bc32b8	24	struct page , struct page , enum migrate_mode);
62b61f61	25	extern int migrate_pages(struct list_head *l, new_page_t x,
7f0f2496	26	unsigned long private, bool offlining,
7b2a2d4a	27	enum migrate_mode mode, int reason);
189ebff2	28	extern int migrate_huge_page(struct page *, new_page_t x,
7f0f2496	29	unsigned long private, bool offlining,
a6bc32b8	30	enum migrate_mode mode);
95a402c3	31
2d1db3b1 CL	32	extern int fail_migrate_page(struct address_space *,
2d1db3b1 CL	33	struct page , struct page );
b20a3503 CL	34
b20a3503 CL	35	extern int migrate_prep(void);
748446bb	36	extern int migrate_prep_local(void);
7b2259b3 CL	37	extern int migrate_vmas(struct mm_struct *mm,
	38	const nodemask_t from, const nodemask_t to,
	39	unsigned long flags);
290408d4 NH	40	extern void migrate_page_copy(struct page newpage, struct page page);
	41	extern int migrate_huge_page_move_mapping(struct address_space *mapping,
	42	struct page newpage, struct page page);
b20a3503	43	#else
64cdd548	44
e13861d8	45	static inline void putback_lru_pages(struct list_head *l) {}
95a402c3	46	static inline int migrate_pages(struct list_head *l, new_page_t x,
7f0f2496	47	unsigned long private, bool offlining,
7b2a2d4a	48	enum migrate_mode mode, int reason) { return -ENOSYS; }
189ebff2	49	static inline int migrate_huge_page(struct page *page, new_page_t x,
7f0f2496	50	unsigned long private, bool offlining,
a6bc32b8	51	enum migrate_mode mode) { return -ENOSYS; }
9bf9e89c	52
b20a3503	53	static inline int migrate_prep(void) { return -ENOSYS; }
748446bb	54	static inline int migrate_prep_local(void) { return -ENOSYS; }
b20a3503	55
7b2259b3 CL	56	static inline int migrate_vmas(struct mm_struct *mm,
	57	const nodemask_t from, const nodemask_t to,
	58	unsigned long flags)
	59	{
	60	return -ENOSYS;
	61	}
	62
290408d4 NH	63	static inline void migrate_page_copy(struct page *newpage,
	64	struct page *page) {}
	65
6f39ce05	66	static inline int migrate_huge_page_move_mapping(struct address_space *mapping,
290408d4 NH	67	struct page newpage, struct page page)
	68	{
	69	return -ENOSYS;
	70	}
	71
b20a3503 CL	72	/* Possible settings for the migrate_page() method in address_operations */
	73	#define migrate_page NULL
	74	#define fail_migrate_page NULL
	75
	76	#endif /* CONFIG_MIGRATION */
7039e1db PZ	77
	78	#ifdef CONFIG_NUMA_BALANCING
	79	extern int migrate_misplaced_page(struct page *page, int node);
e14808b4 MG	80	extern int migrate_misplaced_page(struct page *page, int node);
e14808b4 MG	81	extern bool migrate_ratelimited(int node);
7039e1db PZ	82	#else
	83	static inline int migrate_misplaced_page(struct page *page, int node)
	84	{
	85	return -EAGAIN; /* can't migrate now */
	86	}
e14808b4 MG	87	static inline bool migrate_ratelimited(int node)
	88	{
	89	return false;
	90	}
7039e1db PZ	91	#endif /* CONFIG_NUMA_BALANCING */
7039e1db PZ	92
b20a3503	93	#endif /* _LINUX_MIGRATE_H */