[linux-2.6-block.git] / include / linux / page-isolation.h

#ifndef __LINUX_PAGEISOLATION_H
#define __LINUX_PAGEISOLATION_H

#ifdef CONFIG_MEMORY_ISOLATION
static inline bool is_migrate_isolate_page(struct page *page)
{
	return get_pageblock_migratetype(page) == MIGRATE_ISOLATE;
}
static inline bool is_migrate_isolate(int migratetype)
{
	return migratetype == MIGRATE_ISOLATE;
}
#else
static inline bool is_migrate_isolate_page(struct page *page)
{
	return false;
}
static inline bool is_migrate_isolate(int migratetype)
{
	return false;
}
#endif

bool has_unmovable_pages(struct zone *zone, struct page *page, int count,
			 bool skip_hwpoisoned_pages);
void set_pageblock_migratetype(struct page *page, int migratetype);
int move_freepages_block(struct zone *zone, struct page *page,
				int migratetype);
int move_freepages(struct zone *zone,
			  struct page *start_page, struct page *end_page,
			  int migratetype);

/*
 * Changes migrate type in [start_pfn, end_pfn) to be MIGRATE_ISOLATE.
 * If specified range includes migrate types other than MOVABLE or CMA,
 * this will fail with -EBUSY.
 *
 * For isolating all pages in the range finally, the caller have to
 * free all pages in the range. test_page_isolated() can be used for
 * test it.
 */
int
start_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
			 unsigned migratetype, bool skip_hwpoisoned_pages);

/*
 * Changes MIGRATE_ISOLATE to MIGRATE_MOVABLE.
 * target range is [start_pfn, end_pfn)
 */
int
undo_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
			unsigned migratetype);

/*
 * Test all pages in [start_pfn, end_pfn) are isolated or not.
 */
int test_pages_isolated(unsigned long start_pfn, unsigned long end_pfn,
			bool skip_hwpoisoned_pages);

/*
 * Internal functions. Changes pageblock's migrate type.
 */
int set_migratetype_isolate(struct page *page, bool skip_hwpoisoned_pages);
void unset_migratetype_isolate(struct page *page, unsigned migratetype);
struct page *alloc_migrate_target(struct page *page, unsigned long private,
				int **resultp);

#endif
Commit	Line	Data
	1	#ifndef __LINUX_PAGEISOLATION_H
	2	#define __LINUX_PAGEISOLATION_H
	3
	4	#ifdef CONFIG_MEMORY_ISOLATION
	5	static inline bool is_migrate_isolate_page(struct page *page)
	6	{
	7	return get_pageblock_migratetype(page) == MIGRATE_ISOLATE;
	8	}
	9	static inline bool is_migrate_isolate(int migratetype)
	10	{
	11	return migratetype == MIGRATE_ISOLATE;
	12	}
	13	#else
	14	static inline bool is_migrate_isolate_page(struct page *page)
	15	{
	16	return false;
	17	}
	18	static inline bool is_migrate_isolate(int migratetype)
	19	{
	20	return false;
	21	}
	22	#endif
	23
	24	bool has_unmovable_pages(struct zone zone, struct page page, int count,
	25	bool skip_hwpoisoned_pages);
	26	void set_pageblock_migratetype(struct page *page, int migratetype);
	27	int move_freepages_block(struct zone zone, struct page page,
	28	int migratetype);
	29	int move_freepages(struct zone *zone,
	30	struct page start_page, struct page end_page,
	31	int migratetype);
	32
	33	/*
	34	* Changes migrate type in [start_pfn, end_pfn) to be MIGRATE_ISOLATE.
	35	* If specified range includes migrate types other than MOVABLE or CMA,
	36	* this will fail with -EBUSY.
	37	*
	38	* For isolating all pages in the range finally, the caller have to
	39	* free all pages in the range. test_page_isolated() can be used for
	40	* test it.
	41	*/
	42	int
	43	start_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
	44	unsigned migratetype, bool skip_hwpoisoned_pages);
	45
	46	/*
	47	* Changes MIGRATE_ISOLATE to MIGRATE_MOVABLE.
	48	* target range is [start_pfn, end_pfn)
	49	*/
	50	int
	51	undo_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
	52	unsigned migratetype);
	53
	54	/*
	55	* Test all pages in [start_pfn, end_pfn) are isolated or not.
	56	*/
	57	int test_pages_isolated(unsigned long start_pfn, unsigned long end_pfn,
	58	bool skip_hwpoisoned_pages);
	59
	60	/*
	61	* Internal functions. Changes pageblock's migrate type.
	62	*/
	63	int set_migratetype_isolate(struct page *page, bool skip_hwpoisoned_pages);
	64	void unset_migratetype_isolate(struct page *page, unsigned migratetype);
	65	struct page alloc_migrate_target(struct page page, unsigned long private,
	66	int **resultp);
	67
	68	#endif