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[sfrench/cifs-2.6.git] / 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