From: Avi Kivity <avi@redhat.com>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: "Yan, Zheng" <zheng.z.yan@linux.intel.com>,
Pekka Enberg <penberg@kernel.org>,
Sasha Levin <levinsasha928@gmail.com>,
Asias He <asias.hejun@gmail.com>,
Cyrill Gorcunov <gorcunov@gmail.com>, Ingo Molnar <mingo@elte.hu>,
KVM General <kvm@vger.kernel.org>, Gleb Natapov <gleb@redhat.com>
Subject: Re: perf uncore & lkvm woes
Date: Tue, 21 Aug 2012 11:34:47 +0300 [thread overview]
Message-ID: <50334827.6010906@redhat.com> (raw)
In-Reply-To: <1345533096.23018.83.camel@twins>
On 08/21/2012 10:11 AM, Peter Zijlstra wrote:
> On Sun, 2012-08-19 at 12:55 +0300, Avi Kivity wrote:
>> > I think Avi prefers the method where KVM 'fakes' the MSRs and we have to
>> > detect if the MSRs actually work or not.
>>
>> s/we have/we don't have/.
>
> So for the 'normal' PMU we actually do check to see if the MSRs are
> being faked and bail if they are.
That was because earlier versions of kvm did not virtualize the pmu.
The approaches are not mutually exclusive. We can check in the guest,
and fake it in the host.
The problem with faking it in the host is if someone actually relies on
the pmu for something, not just instrumentation. We do that for the
watchdog, but I don't see it happening with the uncore pmu.
--
error compiling committee.c: too many arguments to function
next prev parent reply other threads:[~2012-08-21 8:35 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-16 7:01 perf uncore & lkvm woes Pekka Enberg
2012-08-16 7:07 ` Cyrill Gorcunov
2012-08-16 7:16 ` Cyrill Gorcunov
2012-08-16 7:16 ` Pekka Enberg
2012-08-16 7:19 ` Peter Zijlstra
2012-08-16 7:38 ` Yan, Zheng
2012-08-16 7:41 ` Pekka Enberg
2012-08-16 7:46 ` Cyrill Gorcunov
2012-08-16 8:45 ` Avi Kivity
2012-08-16 9:06 ` Cyrill Gorcunov
2012-08-16 9:23 ` Pekka Enberg
2012-08-16 8:40 ` Avi Kivity
2012-08-16 11:06 ` Avi Kivity
2012-08-16 11:17 ` Peter Zijlstra
2012-08-16 11:25 ` Avi Kivity
2012-08-17 1:40 ` Yan, Zheng
2012-08-17 6:56 ` Peter Zijlstra
2012-08-19 9:55 ` Avi Kivity
2012-08-20 4:15 ` Yan, Zheng
2012-08-20 8:49 ` Avi Kivity
2012-08-21 1:11 ` Yan, Zheng
2012-08-21 8:32 ` Avi Kivity
2012-08-21 9:07 ` Yan, Zheng
2012-08-20 5:30 ` Yan, Zheng
2012-08-20 8:48 ` Avi Kivity
2012-08-21 7:11 ` Peter Zijlstra
2012-08-21 8:34 ` Avi Kivity [this message]
2012-08-21 10:35 ` Peter Zijlstra
2012-08-22 8:53 ` Avi Kivity
2012-08-16 14:28 ` David Ahern
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