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balloon.h
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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 device;
33 #ifdef CONFIG_XEN_SELFBALLOONING
34 extern int register_xen_selfballooning(struct device *dev);
35 #else
36 static inline int register_xen_selfballooning(struct device *dev)
37 {
38  return -ENOSYS;
39 }
40 #endif
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