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 44