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

From	"Li, Liang Z" <liang.z.li@intel.com>
Newsgroups	linux.kernel
Subject	RE: [RFC qemu 2/4] virtio-balloon: Add a new feature to balloon device
Date	2016-03-04 03:30 +0100
Message-ID	<r8NF7-8b8-1@gated-at.bofh.it> (permalink)
References	<r8z97-5Rb-3@gated-at.bofh.it> <r8z98-5Rb-17@gated-at.bofh.it> <r8B1h-7eH-27@gated-at.bofh.it>
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> 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@intel.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

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[RFC qemu 2/4] virtio-balloon: Add a new feature to balloon device Liang Li <liang.z.li@intel.com> - 2016-03-03 12:00 +0100
  Re: [RFC qemu 2/4] virtio-balloon: Add a new feature to balloon  device Cornelia Huck <cornelia.huck@de.ibm.com> - 2016-03-03 13:30 +0100
    RE: [RFC qemu 2/4] virtio-balloon: Add a new feature to balloon  device "Li, Liang Z" <liang.z.li@intel.com> - 2016-03-04 03:40 +0100
  Re: [RFC qemu 2/4] virtio-balloon: Add a new feature to balloon  device "Michael S. Tsirkin" <mst@redhat.com> - 2016-03-03 14:00 +0100
    RE: [RFC qemu 2/4] virtio-balloon: Add a new feature to balloon  device "Li, Liang Z" <liang.z.li@intel.com> - 2016-03-04 03:30 +0100

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