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Date: Tue, 10 Nov 2009 08:58:27 -0600 From: Anthony Liguori <aliguori@...ibm.com> To: Avi Kivity <avi@...hat.com> CC: Anthony Liguori <anthony@...emonkey.ws>, Rusty Russell <rusty@...tcorp.com.au>, agl@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org, virtualization@...ts.linux-foundation.org, qemu-devel@...gnu.org Subject: Re: [Qemu-devel] Re: virtio: Add memory statistics reporting to the balloon driver Avi Kivity wrote: > 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). I'm not terribly opposed to using a vq for this. I would expect the stat update interval to be rather long (10s probably) but a vq works just as well. -- Regards, Anthony Liguori -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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