[deliverable/linux.git] / include / xen / balloon.h

/******************************************************************************
 * Xen balloon functionality
 */

#define RETRY_UNLIMITED	0

struct balloon_stats {
	/* We aim for 'current allocation' == 'target allocation'. */
	unsigned long current_pages;
	unsigned long target_pages;
	/* Number of pages in high- and low-memory balloons. */
	unsigned long balloon_low;
	unsigned long balloon_high;
	unsigned long schedule_delay;
	unsigned long max_schedule_delay;
	unsigned long retry_count;
	unsigned long max_retry_count;
#ifdef CONFIG_XEN_BALLOON_MEMORY_HOTPLUG
	unsigned long hotplug_pages;
	unsigned long balloon_hotplug;
#endif
};

extern struct balloon_stats balloon_stats;

void balloon_set_new_target(unsigned long target);

int alloc_xenballooned_pages(int nr_pages, struct page **pages,
		bool highmem);
void free_xenballooned_pages(int nr_pages, struct page **pages);

struct page *get_balloon_scratch_page(void);
void put_balloon_scratch_page(void);

struct device;
#ifdef CONFIG_XEN_SELFBALLOONING
extern int register_xen_selfballooning(struct device *dev);
#else
static inline int register_xen_selfballooning(struct device *dev)
{
	return -ENOSYS;
}
#endif
Commit	Line	Data
	1	/******************************************************************************
	2	* Xen balloon functionality
	3	*/
	4
	5	#define RETRY_UNLIMITED 0
	6
	7	struct balloon_stats {
	8	/* We aim for 'current allocation' == 'target allocation'. */
	9	unsigned long current_pages;
	10	unsigned long target_pages;
	11	/* Number of pages in high- and low-memory balloons. */
	12	unsigned long balloon_low;
	13	unsigned long balloon_high;
	14	unsigned long schedule_delay;
	15	unsigned long max_schedule_delay;
	16	unsigned long retry_count;
	17	unsigned long max_retry_count;
	18	#ifdef CONFIG_XEN_BALLOON_MEMORY_HOTPLUG
	19	unsigned long hotplug_pages;
	20	unsigned long balloon_hotplug;
	21	#endif
	22	};
	23
	24	extern struct balloon_stats balloon_stats;
	25
	26	void balloon_set_new_target(unsigned long target);
	27
	28	int alloc_xenballooned_pages(int nr_pages, struct page **pages,
	29	bool highmem);
	30	void free_xenballooned_pages(int nr_pages, struct page **pages);
	31
	32	struct page *get_balloon_scratch_page(void);
	33	void put_balloon_scratch_page(void);
	34
	35	struct device;
	36	#ifdef CONFIG_XEN_SELFBALLOONING
	37	extern int register_xen_selfballooning(struct device *dev);
	38	#else
	39	static inline int register_xen_selfballooning(struct device *dev)
	40	{
	41	return -ENOSYS;
	42	}
	43	#endif