Re: [Qemu-devel] Re: [PATCH 4/4] Try not to exceed max downtime on stage3

[Anthony Liguori]

On 01/12/2010 05:51 AM, Jan Kiszka wrote:
> Liran Schour wrote:
>    
> > Move to stage3 only when remaining work can be done below max downtime.
> > To make sure the process will converge we will try only MAX_DIRTY_ITERATIONS.
> >      
> OK, that explains now patch 2. But do we have such barrier for memory
> migration as well?

No, we explicitly don't because making that decision is a management 
tool job.

A management tool can force convergence by explicitly stopping the guest.

Iterations is a bad metric because there's no real useful meaning to a user.

Time is probably the best metric and it's easy for a management tool to 
set a timer to stop the guest if it hasn't completed by a certain time 
period.

Regards,

Anthony Liguori