linux-kernel - Re: [RFC 2/2] virtio_balloon: auto-ballooning support

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Message-ID: <51913A9B.2030807@redhat.com>
Date:	Mon, 13 May 2013 15:10:19 -0400
From:	Rik van Riel <riel@...hat.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
CC:	Luiz Capitulino <lcapitulino@...hat.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	aquini@...hat.com, amit.shah@...hat.com, anton@...msg.org
Subject: Re: [RFC 2/2] virtio_balloon: auto-ballooning support

On 05/13/2013 11:35 AM, Michael S. Tsirkin wrote:
> On Mon, May 13, 2013 at 11:22:58AM -0400, Rik van Riel wrote:

>> I believe the Google patches still included some way for the
>> host to initiate balloon inflation on the guest side, because
>> the guest internal state alone is not enough to see when the
>> host is under memory pressure.
>>
>> I discussed the project with the Google developers in question
>> a little over a year ago, but I do not remember whether their
>> pressure notification went through qemu, or directly from the
>> host kernel to the guest kernel...
>
> So increasing the max number of pages in balloon
> indicates host memory pressure to the guest?
> Fair enough but I wonder whether there's a way to
> make it more explicit in the interface, somehow.

There may be a better way to do this, but I am really not sure
what that would be. What properties would you like to see in
the interface? What kind of behaviour are you looking for?

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