linux-kernel - Re: virtio: Add memory statistics reporting to the balloon driver

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Message-Id: <200911101312.02650.rusty@rustcorp.com.au>
Date:	Tue, 10 Nov 2009 13:12:02 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Adam Litke <agl@...ibm.com>
Cc:	qemu-devel@...gnu.org, "Anthony Liguori" <aliguori@...ibm.com>,
	Avi Kivity <avi@...hat.com>,
	virtualization@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: virtio: Add memory statistics reporting to the balloon driver

On Tue, 10 Nov 2009 03:02:06 am Adam Litke wrote:
> A simpler approach is to collect memory statistics in the virtio
> balloon driver and communicate them to the host via the device config space.

There are two issues I see with this.  First, there's an atomicity problem
since you can't tell when the stats are consistent.  Second, polling is
ugly.

A stats vq might solve this more cleanly?
Rusty.
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