On 01/16/2014 09:23 AM, Joaquim Barrera wrote: > Hello everyone, > > Can somebody point where I can find the code where libvirt makes the > decision to complete a live migration? Libvirt doesn't make the decision, qemu does. So you'll have to look in the qemu code. Libvirt just reacts to the change in state reported by qemu when the decision to pause the guest on the source has already occurred, and uses that to tell the guest on the destination to start running. > > I mean, at some point syncronising the VM state, it has to decide that > the delta left to be migrate is low enough to achieve downtime 0, so > libvirt finishes the migration. This "low enough" must be defined > somewhere in the code, but I am unable to find it. You can also tune the threshold on the fly (see virDomainMigrateSetMaxDowntime) or even force the transition immediately (convert from a live migration to a paused migration, so that the current delta remaining is now sent in a final pass; useful if live migration never makes enough progress to converge over to the final paused migration on its own - see how 'virsh migrate --timeout' is implemented). -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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