libvirt users - Apr 2016 - Can you get page dirtying information on non-migrating VMs?

Hello everyone,

I've been looking through the libvirt API to get information about
memory page dirtying of VMs. I need these to aid decisions on which VM
to migrate.
The only thing I found is

virDomainGetJobStats()

with

VIR_DOMAIN_JOB_MEMORY_DIRTY_RATE

but that only works when a migration is already running.
Is there a way to get information on VMs which are not already migrating?

Thanks and best regards,
Dave

On Mon, Apr 04, 2016 at 05:57:43PM +0200, tfcyundlim dehasawzdg
wrote:
> Hello everyone,
> 
> I've been looking through the libvirt API to get information about
> memory page dirtying of VMs. I need these to aid decisions on which VM
> to migrate.
> The only thing I found is
> 
> virDomainGetJobStats()
> 
> with
> 
> VIR_DOMAIN_JOB_MEMORY_DIRTY_RATE
> 
> but that only works when a migration is already running.
> Is there a way to get information on VMs which are not already migrating?
No, IIUC, page dirtying is only enbled by QEMU while migrating because it
has non-neglible performance impact on the guest.

Regards,
Daniel
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