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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:1.9.1.4pre) 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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