From: Ingo Molnar <mingo@elte.hu>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Avi Kivity <avi@redhat.com>,
"Zhang, Yanmin" <yanmin_zhang@linux.intel.com>,
LKML <linux-kernel@vger.kernel.org>,
kvm@vger.kernel.org, Fr??d??ric Weisbecker <fweisbec@gmail.com>,
Arnaldo Carvalho de Melo <acme@redhat.com>,
Cyrill Gorcunov <gorcunov@gmail.com>,
Lin Ming <ming.m.lin@intel.com>,
Sheng Yang <sheng@linux.intel.com>,
Marcelo Tosatti <mtosatti@redhat.com>,
oerg Roedel <joro@8bytes.org>,
Jes Sorensen <Jes.Sorensen@redhat.com>,
Gleb Natapov <gleb@redhat.com>,
Zachary Amsden <zamsden@redhat.com>,
zhiteng.huang@intel.com, tim.c.chen@intel.com
Subject: Re: [RFC] para virt interface of perf to support kvm guest os statistics collection in guest os
Date: Wed, 9 Jun 2010 12:27:43 +0200 [thread overview]
Message-ID: <20100609102743.GC1150@elte.hu> (raw)
In-Reply-To: <1276078122.2046.1227.camel@twins>
* Peter Zijlstra <peterz@infradead.org> wrote:
> On Wed, 2010-06-09 at 12:41 +0300, Avi Kivity wrote:
> >
> > >> Disabling the watchdog is unfortunate. Why is it necessary?
> > >>
> > > perf always uses NMI, so we disable the nmi_watchdog when a perf_event is
> > > set up in case they might have impact.
> > >
> >
> > Ok. Is that the case for the hardware pmus as well? If so it might be
> > done in common code.
>
> The x86 hardware pmu implementation disables the lapic watchdog too, but
> recent kernels come with a watchdog implementation on top of perf, the old
> lapic one will be depricated.
Note, that code is in -tip, queued for v2.6.36.
Ingo
next prev parent reply other threads:[~2010-06-09 10:28 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-09 3:30 [RFC] para virt interface of perf to support kvm guest os statistics collection in guest os Zhang, Yanmin
2010-06-09 8:33 ` Avi Kivity
2010-06-09 9:21 ` Zhang, Yanmin
2010-06-09 9:41 ` Avi Kivity
2010-06-09 10:08 ` Peter Zijlstra
2010-06-09 10:27 ` Ingo Molnar [this message]
2010-06-09 11:12 ` Avi Kivity
2010-06-10 2:21 ` Zhang, Yanmin
2010-06-10 3:06 ` Avi Kivity
2010-06-10 5:13 ` Zhang, Yanmin
2010-06-10 9:50 ` Peter Zijlstra
2010-06-11 2:11 ` Zhang, Yanmin
2010-06-09 8:59 ` Avi Kivity
2010-06-09 9:30 ` Zhang, Yanmin
2010-06-09 9:46 ` Avi Kivity
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