[Xen-devel] Usage and details for XEN_BALLOON_MEMORY_HOTPLUG

[Gmail <yzt356@xxxxxxxxx>]

Hi there,
I have noticed that there is XEN-BALLON-MEMORY_HOTPLUG config since Linux 3.1. 
IMO, this is a module for hypervisor to allocate more memory than VM start-up 
configuration from the limited description in kernel codes. I have some 
questions about the usage and details of this config:

1. Does this module support memory reclame when guest decrease its memory 
usage? If so, what is the strategy? Or just do it manually?

2. What about handle guest memory only by hotplug? Is there any mechanism to 
support inflating/deflating guest memory simply by memory hotplug?

3. How about the overhead of reconstructing the MMU related area when executing 
memory hotplug? Are there any articles refer to this?

Besides, does Linux support removing physical memory now (in physical 
environment, not VM)?

Thanks

Arthur Chunqi Li
Department of Computer Science
School of EECS
Peking University
Beijing, China
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