[Xen-devel] how to change the memory size of a VM

[Jia Rao <rickenrao@xxxxxxxxx>]

Hi all,

I am looking into a problem that when the memory size of a VM is changed which part of the original memory is taken away by xen.
For example, if I change the memory size of a VM from 2048MB --> 1024MB, how can I tell which are the 1024M byte that will be taken away (I do not want the xen to take the memory spaces that are caching useful data).

The command for memory size reconfiguration is "xm mem-set", so I looked the source code of xm.
It turned out to be the following python calls:

tools/python/xen/xm/main.py: setMemoryTarget(dom, mem_target)
tools/python/xen/xend/XendDomainInfo.py: setMemoryTarget:         self._safe_set_memory('memory_dynamic_min', target * MiB)
        self._safe_set_memory('memory_dynamic_max', target * MiB)
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