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Message-ID: <4AF97C1A.2080609@redhat.com> Date: Tue, 10 Nov 2009 16:43:38 +0200 From: Avi Kivity <avi@...hat.com> To: Anthony Liguori <anthony@...emonkey.ws> CC: Rusty Russell <rusty@...tcorp.com.au>, Adam Litke <agl@...ibm.com>, linux-kernel@...r.kernel.org, Anthony Liguori <aliguori@...ibm.com>, virtualization@...ts.linux-foundation.org, qemu-devel@...gnu.org Subject: Re: [Qemu-devel] Re: virtio: Add memory statistics reporting to the balloon driver 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 -- 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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