On 05/16/2012 08:35 AM, Daniel P. Berrange wrote:
The virDomainGetXMLDesc and virDomainGetInfo APIs for QEMU suffer from needing to run 'query-balloon' to update the balloon level. This has caused us performance problems and even worse caused us to lock up on a dead QEMU.
The following two patches to QEMU add a BALLOON_EVENT and a query-events command to QMP. With those two parts, we can avoiding running the query-balloon command at all.
https://lists.gnu.org/archive/html/qemu-devel/2012-05/msg02215.html https://lists.gnu.org/archive/html/qemu-devel/2012-05/msg02255.html
I like the goal of this series, but we shouldn't apply it until this has been accepted in upstream qemu and we have a commit id to point to. That said, I'll still review the code. -- Eric Blake eblake@redhat.com +1-919-301-3266 Libvirt virtualization library http://libvirt.org