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Re: [Qemu-devel] [RFC Design Doc]Speed up live migration by skipping fre

From: Li, Liang Z
Subject: Re: [Qemu-devel] [RFC Design Doc]Speed up live migration by skipping free pages
Date: Thu, 24 Mar 2016 15:25:30 +0000

> On 24/03/2016 16:16, Li, Liang Z wrote:
> > > There's no guarantee that there's a single 'hole'
> > > even on the PC, and we want balloon to be portable.
> >
> > As long as we know how many 'hole' and where the holes are.
> The mapping between ram_addr_t and GPA is completely internal to QEMU.
> Passing it to the guest is a layering violation.
> Paolo

Yes. I have already changed this in my design.

> > we can filter out them. QEMU should have this kind of information.
> > I know my RFC patch passed an arch specific free page bitmap is not a
> > good idea. So in my design, I changed this by passing a loose free
> > page bitmap which contains the holes, and let QEMU to filter out the
> > holes according to some arch specific information. This can make balloon be
> portable.
> >

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