linux-kernel - Re: [RFC PATCH 3/4] virtio_balloon: add pressure notification via a new virtqueue

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Message-ID: <20140116204351.7d48c2b9@redhat.com>
Date:	Thu, 16 Jan 2014 20:43:51 -0500
From:	Luiz Capitulino <lcapitulino@...hat.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org, riel@...hat.com,
	aarcange@...hat.com, aquini@...hat.com, mst@...hat.com,
	vdavydov@...allels.com, amit.shah@...hat.com, dfediuck@...hat.com,
	alitke@...hat.com
Subject: Re: [RFC PATCH 3/4] virtio_balloon: add pressure notification via a
 new virtqueue

On Thu, 16 Jan 2014 20:38:19 -0500
Luiz Capitulino <lcapitulino@...hat.com> wrote:

> > What does qemu do with this information?
> 
> There are two possible scenarios:
> 
>  1. The balloon driver is currently inflating when it gets under
>     pressure
> 
>     QEMU resets "num_pages" to the current balloon size. This
>     cancels the on-going inflate
> 
>  2. The balloon driver is not inflating, eg. it's possibly sleeping
> 
>    QEMU issues a deflate
> 
> But note that those scenarios are not supposed to be used with the
> current device, they are part of the automatic ballooning feature.
> I CC'ed you on the QEMU patch, you can find it here case you didn't
> see it:
> 
>  http://marc.info/?l=kvm&m=138988966315690&w=2

By "current device" I meant "outside of automatic ballooning scope".
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