1/******************************************************************************
 2 * Xen balloon functionality
 3 */
 4
 5#define RETRY_UNLIMITED	0
 6
 7struct 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
24extern struct balloon_stats balloon_stats;
25
26void balloon_set_new_target(unsigned long target);
27
28int alloc_xenballooned_pages(int nr_pages, struct page **pages,
29		bool highmem);
30void free_xenballooned_pages(int nr_pages, struct page **pages);
31
32struct device;
33#ifdef CONFIG_XEN_SELFBALLOONING
34extern int register_xen_selfballooning(struct device *dev);
35#else
36static inline int register_xen_selfballooning(struct device *dev)
37{
38	return -ENOSYS;
39}
40#endif