linux-kernel - RE: [RFC qemu 2/4] virtio-balloon: Add a new feature to balloon device

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Message-ID: <F2CBF3009FA73547804AE4C663CAB28E03770F7C@SHSMSX101.ccr.corp.intel.com>
Date:	Fri, 4 Mar 2016 02:29:19 +0000
From:	"Li, Liang Z" <liang.z.li@...el.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
CC:	"quintela@...hat.com" <quintela@...hat.com>,
	"amit.shah@...hat.com" <amit.shah@...hat.com>,
	"qemu-devel@...gnu.org" <qemu-devel@...gnu.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"pbonzini@...hat.com" <pbonzini@...hat.com>,
	"rth@...ddle.net" <rth@...ddle.net>,
	"ehabkost@...hat.com" <ehabkost@...hat.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"virtualization@...ts.linux-foundation.org" 
	<virtualization@...ts.linux-foundation.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"dgilbert@...hat.com" <dgilbert@...hat.com>
Subject: RE: [RFC qemu 2/4] virtio-balloon: Add a new feature to balloon
 device

> Subject: Re: [RFC qemu 2/4] virtio-balloon: Add a new feature to balloon
> device
> 
> On Thu, Mar 03, 2016 at 06:44:26PM +0800, Liang Li wrote:
> > Extend the virtio balloon device to support a new feature, this new
> > feature can help to get guest's free pages information, which can be
> > used for live migration optimzation.
> >
> > Signed-off-by: Liang Li <liang.z.li@...el.com>
> 
> I don't understand why we need a new interface.
> Balloon already sends free pages to host.
> Just teach host to skip these pages.
> 

I just make use the current virtio-balloon implementation,  it's more complicated to
invent a new virtio-io device...
Actually, there is no need to inflate the balloon before live migration, so the host has
no information about the guest's free pages, that's why I add a new one.

> Maybe instead of starting with code, you should send a high level description
> to the virtio tc for consideration?
> 
> You can do it through the mailing list or using the web form:
> http://www.oasis-
> open.org/committees/comments/form.php?wg_abbrev=virtio
> 

Thanks for your information and suggestion.

Liang