linux-kernel - Re: [PATCH] posix-timers: RCU conversion

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Message-ID: <4D9ADC1D.5010109@redhat.com>
Date:	Tue, 05 Apr 2011 12:08:45 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
CC:	ben@...u.net, Eric Dumazet <eric.dumazet@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	KVM list <kvm@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	John Stultz <johnstul@...ibm.com>,
	Richard Cochran <richard.cochran@...cron.at>,
	Mike Galbraith <efault@....de>
Subject: Re: [PATCH] posix-timers: RCU conversion

On 04/05/2011 12:03 PM, Peter Zijlstra wrote:
> On Tue, 2011-04-05 at 11:56 +0300, Avi Kivity wrote:
> >
> >  Could be waking up due to guest wakeups, or qemu internal wakeups
> >  (display refresh) or due to guest timer sources which are masked away in
> >  the guest (if that's the case we should optimize it away).
>
> Right, so I guess we're all clutching at straws here :-)
>
> Ben how usable is that system when its in that state? Could you run a
> function trace or a trace with all kvm and sched trace-events enabled?

Ben, to do that, look up http://www.linux-kvm.org/page/Tracing; the 
command for combined sched/kvm tracing is

# trace-cmd record -b 20000 -e kvm -e sched



-- 
error compiling committee.c: too many arguments to function

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