T> basically i want to know that is xend manipulate the xenstore to T> change the VM's memory or there any other mechanism which dom0 T> follows. That is quite offtopic for this list. I suggest you go ask on xen-devel. T> If ballooning of memory happens through xend, it means two paths which T> i am not sure how it happens. T> 1. Xenstore shared memory page and event channel is mapped to dom0 T> memory area. Now xend enamurate all the VM's in xenstore thorough xen T> bus. Now change the balloon watch node for the concern domain, i.e T> /local/domain/domaid/memory/target <value> T> 2. Instead of using the xen bus interface, xend directly uses the T> xenstore API (i.e. xenstore-write) to manipulate the xenstore node. I don't really see how these are different, but yes, xend writes to the xenstore node to set the memory target. -- Dan Smith IBM Linux Technology Center Open Hypervisor Team email: danms@us.ibm.com