Re: [Qemu-devel] [PULL 00/27] Migration pull

[Dr. David Alan Gilbert]

* Alexey Perevalov (address@hidden) wrote:
> On 01/22/2018 07:26 PM, Peter Maydell wrote:
> > On 22 January 2018 at 16:25, Alexey Perevalov <address@hidden> wrote:
> > > I want to keep 64bit atomic operations in migration.
> > Sorry, you can't -- some 32 bit CPUs simply do not provide these
> > operations. You need to rework your design to not require this.
> I would like to ask David,
> how do you think is it normal to use just one half of now_ms (int64_t), one
> half
> of 64 bit value should represent 1200 hours and probably it's enough to keep
> time
> difference.

Yes you could use an offset (start of migration?) - if the postcopy
phase is taking more than that long we're probably in trouble.
But remember your '0' value is special.

Dave

> > 
> > thanks
> > -- PMM
> > 
> > 
> > 
> 
> -- 
> Best regards,
> Alexey Perevalov
--
Dr. David Alan Gilbert / address@hidden / Manchester, UK