From mboxrd@z Thu Jan  1 00:00:00 1970
From: Rafael Aquini <aquini@redhat.com>
Subject: Re: [PATCH v7 2/4] virtio_balloon: introduce migration primitives to
	balloon pages
Date: Tue, 14 Aug 2012 17:11:13 -0300
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To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Rik van Riel <riel@redhat.com>, Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, linux-mm@kvack.org, Andi Kleen <andi@firstfloor.org>, Minchan Kim <minchan@kernel.org>, Andrew Morton <akpm@linux-foundation.org>
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On Tue, Aug 14, 2012 at 10:51:39PM +0300, Michael S. Tsirkin wrote:
> What I think you should do is use rcu for access.
> And here sync rcu before freeing.
> Maybe an overkill but at least a documented synchronization
> primitive, and it is very light weight.
> 

I liked your suggestion on barriers, as well.

Rik, Mel ?