linux-kernel - RE: [Qemu-devel] [PATCH kernel v5 0/5] Extend virtio-balloon for fast (de)inflating & fast live migration

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Date:   Fri, 9 Dec 2016 05:35:45 +0000
From:   "Li, Liang Z" <liang.z.li@...el.com>
To:     "Hansen, Dave" <dave.hansen@...el.com>,
        Andrea Arcangeli <aarcange@...hat.com>
CC:     David Hildenbrand <david@...hat.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "mhocko@...e.com" <mhocko@...e.com>,
        "mst@...hat.com" <mst@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "qemu-devel@...gnu.org" <qemu-devel@...gnu.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "dgilbert@...hat.com" <dgilbert@...hat.com>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        "kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>
Subject: RE: [Qemu-devel] [PATCH kernel v5 0/5] Extend virtio-balloon for
 fast (de)inflating & fast live migration

> On 12/08/2016 08:45 PM, Li, Liang Z wrote:
> > What's the conclusion of your discussion? It seems you want some
> > statistic before deciding whether to  ripping the bitmap from the ABI,
> > am I right?
> 
> I think Andrea and David feel pretty strongly that we should remove the
> bitmap, unless we have some data to support keeping it.  I don't feel as
> strongly about it, but I think their critique of it is pretty valid.  I think the
> consensus is that the bitmap needs to go.
> 

Thanks for you clarification.

> The only real question IMNHO is whether we should do a power-of-2 or a
> length.  But, if we have 12 bits, then the argument for doing length is pretty
> strong.  We don't need anywhere near 12 bits if doing power-of-2.
> 
So each item can max represent 16MB Bytes, seems not big enough,
but enough for most case.
Things became much more simple without the bitmap, and I like simple solution too. :)

I will prepare the v6 and remove all the bitmap related stuffs. Thank you all!

Liang