From: Avi Kivity <avi@redhat.com>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: ben@iagu.net, Eric Dumazet <eric.dumazet@gmail.com>,
Thomas Gleixner <tglx@linutronix.de>,
KVM list <kvm@vger.kernel.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
John Stultz <johnstul@us.ibm.com>,
Richard Cochran <richard.cochran@omicron.at>,
Mike Galbraith <efault@gmx.de>
Subject: Re: [PATCH] posix-timers: RCU conversion
Date: Tue, 05 Apr 2011 12:08:45 +0300 [thread overview]
Message-ID: <4D9ADC1D.5010109@redhat.com> (raw)
In-Reply-To: <1301994229.2225.30.camel@twins>
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
WARNING: multiple messages have this Message-ID (diff)
From: Avi Kivity <avi@redhat.com>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: ben@iagu.net, Eric Dumazet <eric.dumazet@gmail.com>,
Thomas Gleixner <tglx@linutronix.de>,
KVM list <kvm@vger.kernel.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
John Stultz <johnstul@us.ibm.com>,
Richard Cochran <richard.cochran@omicron.at>,
Mike Galbraith <efault@gmx.de>
Subject: Re: [PATCH] posix-timers: RCU conversion
Date: Tue, 05 Apr 2011 12:08:45 +0300 [thread overview]
Message-ID: <4D9ADC1D.5010109@redhat.com> (raw)
In-Reply-To: <1301994229.2225.30.camel@twins>
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
next prev parent reply other threads:[~2011-04-05 9:09 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-18 12:02 KVM lock contention on 48 core AMD machine Ben Nagy
2011-03-18 12:30 ` Joerg Roedel
2011-03-19 4:45 ` Ben Nagy
2011-03-21 9:50 ` Avi Kivity
2011-03-21 11:43 ` Ben Nagy
2011-03-21 13:41 ` Ben Nagy
2011-03-21 13:53 ` Avi Kivity
[not found] ` <AANLkTikWQS281kTtJ32-qo5U+w_BAak7qUwVhUQgOxxv@mail.gmail.com>
2011-03-21 15:50 ` Avi Kivity
2011-03-21 16:16 ` Ben Nagy
2011-03-21 16:33 ` Avi Kivity
2011-03-21 16:54 ` Eric Dumazet
2011-03-21 17:02 ` Avi Kivity
2011-03-21 17:12 ` Eric Dumazet
2011-03-21 18:12 ` Ben Nagy
2011-03-21 22:27 ` [RFC] posix-timers: RCU conversion Eric Dumazet
2011-03-22 7:09 ` [PATCH] " Eric Dumazet
2011-03-22 8:59 ` Ben Nagy
2011-03-22 10:35 ` Avi Kivity
2011-03-22 10:35 ` Avi Kivity
2011-04-04 3:30 ` Ben Nagy
2011-04-04 7:18 ` Avi Kivity
2011-04-04 7:18 ` Avi Kivity
2011-04-05 7:49 ` Peter Zijlstra
2011-04-05 8:16 ` Avi Kivity
2011-04-05 8:16 ` Avi Kivity
2011-04-05 8:48 ` Peter Zijlstra
2011-04-05 8:56 ` Avi Kivity
2011-04-05 8:56 ` Avi Kivity
2011-04-05 9:03 ` Peter Zijlstra
2011-04-05 9:08 ` Avi Kivity [this message]
2011-04-05 9:08 ` Avi Kivity
2011-04-05 9:50 ` Ben Nagy
2011-04-05 8:56 ` Mike Galbraith
2011-04-03 16:54 ` Eric Dumazet
2011-04-04 18:08 ` john stultz
2011-04-04 19:47 ` Eric Dumazet
2011-04-05 14:48 ` Oleg Nesterov
2011-04-05 15:18 ` [PATCH v2] " Eric Dumazet
2011-04-05 15:43 ` Oleg Nesterov
2011-05-16 15:10 ` Avi Kivity
2011-05-16 15:30 ` Eric Dumazet
2011-04-08 18:28 ` [PATCH] " Paul E. McKenney
2011-03-21 18:14 ` KVM lock contention on 48 core AMD machine Avi Kivity
2011-03-21 18:48 ` Michael Tokarev
2011-03-21 18:53 ` Avi Kivity
2011-03-18 12:44 ` Stefan Hajnoczi
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