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Re: [Qemu-devel] Re: virtio: Add memory statistics reporting to the ball

From: Avi Kivity
Subject: Re: [Qemu-devel] Re: virtio: Add memory statistics reporting to the balloon driver
Date: Tue, 10 Nov 2009 16:43:38 +0200
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20091014 Fedora/3.0-2.8.b4.fc11 Thunderbird/3.0b4

On 11/10/2009 04:36 PM, Anthony Liguori wrote:

A stats vq might solve this more cleanly?

actual and target are both really just stats. Had we implemented those with a vq, I'd be inclined to agree with you but since they're implemented in the config space, it seems natural to extend the config space with other stats.

There is in fact a difference; actual and target are very rarely updated, while the stats are updated very often. Using a vq means a constant number of exits per batch instead of one exit per statistic. If the vq is host-driven, it also allows the host to control the update frequency dynamically (i.e. stop polling when there is no memory pressure).

error compiling committee.c: too many arguments to function

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