On 05/11/2013 10:19 AM, Tadej Janež wrote: > On Sat, 2013-05-11 at 11:50 -0400, Cole Robinson wrote: >>> >> >> Hmm, qemu doesn't seem to be reporting this info? I'm on F19 with latest >> libvirt and qemu 1.4.1 > >> sudo virsh qemu-monitor-command --hmp f18 "info balloon" >> balloon: actual=2048 > > I get a similar output for this command on my machine: > balloon: actual=1024 > > The version of qemu that I'm using is qemu-kvm-1.2.2-11.fc18.x86_64. > >> Not sure what the problem is... > > Me neither. Maybe someone else on the list has some clues? qemu can't provide guest stats without guest interaction, but waiting for guest interaction is a security hole (a non-cooperative guest can refuse to acknowledge the request, and thus block qemu and libvirt from doing useful work on other guests). Therefore, ever since qemu 0.15 or so, the 'info balloon' command was intentionally crippled so as to plug the security hole, so that the information it reports is now only what qemu can report without guest interaction. There is work underway to switch to an event-based solution - where qemu periodically asks the guest but without blocking, the guest informs qemu when it wants, and where libvirt can then query the most recent guest information (if any) without blocking, which works to remove the hole of a non-cooperative guest stopping progress. But until libvirt been has wired up to use the new QMP querying commands for those properties (and for that matter, until you are using a qemu new enough), there's no way for libvirt to report a stat that qemu doesn't provide. https://lists.gnu.org/archive/html/qemu-devel/2013-01/msg04832.html I couldn't (quickly) find an open bugzilla against libvirt requesting that it start using the qom-get command on new-enough qemu, in order to get guest memory stat reporting back operational. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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