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

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Message-ID: <20130513142511.3c2bde18@redhat.com>
Date:	Mon, 13 May 2013 14:25:11 -0400
From:	Luiz Capitulino <lcapitulino@...hat.com>
To:	Rafael Aquini <aquini@...hat.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org, riel@...hat.com, mst@...hat.com,
	amit.shah@...hat.com, anton@...msg.org
Subject: Re: [RFC 2/2] virtio_balloon: auto-ballooning support

On Mon, 13 May 2013 11:34:41 -0300
Rafael Aquini <aquini@...hat.com> wrote:

> You're right, and the host's member is used to communicate the configured size
> to guest's balloon device, however, by not changing it when the shrinker causes 
> the balloon to deflate will make the balloon thread to be woken up again 
> in order to chase the balloon size target again, won't it? Check

I don't see the balloon thread waking up after the shrinker executes in my
testing. Maybe this is so because it will only wake up when QEMU notifies
a config change.

But anyway, I'll think how to improve this as suggested by Michael too, as
I seem to be changing num_pages' semantics according to the virtio spec.
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