On 07/16/2014 03:13 PM, Yuanzhen Gu wrote: > Hi folks, > > > I am going to make a patch, and need to find the pause and thaw(restore) > function before and after taking Live QEMU Snapshot respectively.
Libvirt has the ability to do just that, when taking external disk-only snapshots. You can turn on libvirt debugging to trace what QMP/agent commands are sent during the overall snapshot operation. > > > Basically, I'm using # (qemu) snapshot_blkdev <blockX> > <snapshot-file><format> taking snapshot, > http://wiki.qemu.org/Features/Snapshots my profile tool didn't work when > giving command inside QMP. > > > Does anyone know how to find the pause (freeze) and restore(thaw) function > before and after taking snapshot? Or anyway using snapshot_blkdev command > outside QEMU console? Thanks a lot in advance! You have to coordinate multiple commands: freeze to the guest agent, then snapshot to QMP, then thaw to the guest agent. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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