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         unsigned long target_unpopulated;
  12         /* Number of pages in high- and low-memory balloons. */
  13         unsigned long balloon_low;
  14         unsigned long balloon_high;
  15         unsigned long total_pages;
  16         unsigned long schedule_delay;
  17         unsigned long max_schedule_delay;
  18         unsigned long retry_count;
  19         unsigned long max_retry_count;
  20 };
  21
  22 extern struct balloon_stats balloon_stats;
  23
  24 void balloon_set_new_target(unsigned long target);
  25
  26 int alloc_xenballooned_pages(int nr_pages, struct page **pages);
  27 void free_xenballooned_pages(int nr_pages, struct page **pages);
  28
  29 struct device;
  30 #ifdef CONFIG_XEN_SELFBALLOONING
  31 extern int register_xen_selfballooning(struct device *dev);
  32 #else
  33 static inline int register_xen_selfballooning(struct device *dev)
  34 {
  35         return -ENOSYS;
  36 }
  37 #endif