when use libvirt0.9.4 ,then memStats() just output a '{ }'.
Generally, it means your qemu returns empty result for monitor command query-balloon. Could you check the debug log to find out what the qemu monitor command returns actually?
libvirt > 0.9.4 memStats() can get the memory stats,but it seems that
the value does not match guest memory usage: virsh # version Compiled against library: libvir 0.9.11 Using library: libvir 0.9.11 Using API: QEMU 0.9.11 Running hypervisor: QEMU 1.0.94 virsh # dommemstat centos actual 524288 rss 276252 while in the 'centos' guest: [root@centos-guest ~]# free -k total used free shared buffers cached Mem: 511148 84784 426364 0 5708 32664 -/+ buffers/cache: 46412 464736 Swap: 2064376 0 2064376 what does the 'rss' mean? thanks.