It seems that the xen balloon functionality for guest is not enabled in<br />
CentOS 3.4.50-8.el6 xen kernel by default via centos-release-xen.x86_64<br />
repo. I think this should have been present since this extra Xen repo needs<br />
to support as both Guest and Host (Dom0).<br />
<br />
Although CONFIG_XEN_BALLOON=y is set which the BALLOON driver is not working. To make it work correctly CONFIG_XEN_SELFBALLOONING=y needs to be present.
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