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 #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