My hypervisor is kvm, when I use libvirt-java api to get guest vm memory information, I found what libvirt can not get real memory(within the vm)statistic, libvirt can only get information from .xml file(such as vmName.xml <currentMemory> lable) in host.

My question is, does libvirt support memory monitor(within vm)? if it's true, how to get. if false, what is the difficulty?