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

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Message-ID: <F2CBF3009FA73547804AE4C663CAB28E3A0FD05E@shsmsx102.ccr.corp.intel.com>
Date:   Wed, 26 Oct 2016 10:13:47 +0000
From:   "Li, Liang Z" <liang.z.li@...el.com>
To:     "Li, Liang Z" <liang.z.li@...el.com>,
        "Hansen, Dave" <dave.hansen@...el.com>,
        "mst@...hat.com" <mst@...hat.com>
CC:     "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 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?
> >
> 
> Hi Dave & Michael,
> 
> I am working on Dave's new bitmap schema, I have finished the part of
> getting the 'hybrid scheme bitmap'
> and found the complexity was more than I expected.  The main issue is more
> memory is required to  save the 'hybrid scheme bitmap' beside that used to
> save the raw page bitmap, for the worst case, the memory required is 3
> times than that in the previous implementation.
> 

3 times memory required is not accurate, please ignore this. sorry ...
The complexity is the point. 

> I am wondering if I should continue, as an alternative solution, how about
> using PFNs array when inflating/deflating only a few pages? Things will be
> much more simple.
> 
> 
> Thanks!
> Liang
> 
> 
> 
> 
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