linux-kernel - Re: [RESEND PATCH v3 kernel 0/7] Extend virtio-balloon for fast (de)inflating & fast live migration

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Date:   Tue, 25 Oct 2016 06:52:13 +0300
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     "Li, Liang Z" <liang.z.li@...el.com>
Cc:     "Hansen, Dave" <dave.hansen@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "virtio-dev@...ts.oasis-open.org" <virtio-dev@...ts.oasis-open.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "qemu-devel@...gnu.org" <qemu-devel@...gnu.org>,
        "quintela@...hat.com" <quintela@...hat.com>,
        "dgilbert@...hat.com" <dgilbert@...hat.com>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "cornelia.huck@...ibm.com" <cornelia.huck@...ibm.com>,
        "amit.shah@...hat.com" <amit.shah@...hat.com>
Subject: Re: [RESEND PATCH v3 kernel 0/7] Extend virtio-balloon for fast
 (de)inflating & fast live migration

On Sun, Oct 23, 2016 at 11:29:25AM +0000, Li, Liang Z wrote:
> > On Fri, Oct 21, 2016 at 10:25:21AM -0700, Dave Hansen wrote:
> > > On 10/20/2016 11:24 PM, Liang Li wrote:
> > > > Dave Hansen suggested a new scheme to encode the data structure,
> > > > because of additional complexity, it's not implemented in v3.
> > >
> > > So, what do you want done with this patch set?  Do you want it applied
> > > as-is so that we can introduce a new host/guest ABI that we must
> > > support until the end of time?  Then, we go back in a year or two and
> > > add the newer format that addresses the deficiencies that this ABI has
> > > with a third version?
> > >
> > 
> > Exactly my questions.
> 
> Hi Dave & Michael,
> 
> In the V2, both of you thought that the memory I allocated for the bitmap is too large, and gave some
>  suggestions about the solution, so I changed the implementation and used  scattered pages for the bitmap
> instead of a large physical continued memory. I didn't get the comments about the changes, so I am not 
> sure whether that is OK or not, that's the why I resend the V3, I just want your opinions about that part. 
> 
> I will implement the new schema as Dave suggested in V4. Before that, could you take a look at this version and
> give some comments? 
> 
> Thanks!
> Liang

Sure, I'll try to review just that part.