include/xen/balloon.h

   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 };
  19
  20 extern struct balloon_stats balloon_stats;
  21
  22 void balloon_set_new_target(unsigned long target);
  23
  24 int alloc_xenballooned_pages(int nr_pages, struct page** pages);
  25 void free_xenballooned_pages(int nr_pages, struct page** pages);
  26
  27 struct sys_device;
  28 #ifdef CONFIG_XEN_SELFBALLOONING
  29 extern int register_xen_selfballooning(struct sys_device *sysdev);
  30 #else
  31 static inline int register_xen_selfballooning(struct sys_device *sysdev)
  32 {
  33         return -ENOSYS;
  34 }
  35 #endif