From: Andi Kleen <andi@firstfloor.org>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Lin Ming <ming.m.lin@intel.com>,
Stephane Eranian <eranian@google.com>,
Andi Kleen <andi@firstfloor.org>, Ingo Molnar <mingo@elte.hu>,
lkml <linux-kernel@vger.kernel.org>,
Frederic Weisbecker <fweisbec@gmail.com>,
Arjan van de Ven <arjan@infradead.org>
Subject: Re: [RFC PATCH 2/3 v2] perf: Implement Nehalem uncore pmu
Date: Thu, 25 Nov 2010 19:20:52 +0100 [thread overview]
Message-ID: <20101125182052.GA7413@basil.fritz.box> (raw)
In-Reply-To: <1290665350.2072.521.camel@laptop>
> Yep, I see no reason to dis-allow sampling. Sure its hard to make sense
> of it, but since there are people who offline all but one cpu of a
> package,
Assuming they don't have any active PCI devices either.
> I bet there are people who will run just one task on a package
> as well.
In that case the sampling has a 1/NUM-CPU-THREADS-IN-PACKAGE chance
to report the right task (or actually somewhat less because the measurement
skew for uncore is much higher than for normal events)
Really for per core measurements using the OFFCORE events is much better.
-Andi
--
ak@linux.intel.com -- Speaking for myself only.
next prev parent reply other threads:[~2010-11-25 18:21 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-21 12:01 [RFC PATCH 2/3 v2] perf: Implement Nehalem uncore pmu Lin Ming
2010-11-21 12:46 ` Andi Kleen
2010-11-21 14:04 ` Lin Ming
2010-11-21 17:00 ` Andi Kleen
2010-11-21 17:44 ` Peter Zijlstra
2010-11-23 10:00 ` Stephane Eranian
2010-11-25 0:24 ` Lin Ming
2010-11-25 6:09 ` Peter Zijlstra
2010-11-25 6:27 ` Lin Ming
2010-11-25 8:48 ` Stephane Eranian
2010-11-25 18:20 ` Andi Kleen [this message]
2010-11-25 21:10 ` Stephane Eranian
2010-11-24 9:55 ` Lin Ming
2010-11-23 10:17 ` Stephane Eranian
2010-11-24 1:33 ` Lin Ming
2010-11-26 5:15 ` Lin Ming
2010-11-26 8:18 ` Stephane Eranian
2010-11-26 8:29 ` Lin Ming
2010-11-26 8:33 ` Stephane Eranian
2010-11-26 9:00 ` Lin Ming
2010-11-26 10:06 ` Stephane Eranian
2010-12-01 3:21 ` Lin Ming
2010-12-01 13:04 ` Stephane Eranian
2010-12-02 5:26 ` Lin Ming
2010-11-26 11:24 ` Peter Zijlstra
2010-11-26 11:25 ` Stephane Eranian
2010-11-26 11:36 ` Peter Zijlstra
2010-11-26 11:41 ` Stephane Eranian
2010-11-26 16:25 ` Lin Ming
2010-12-01 3:28 ` Lin Ming
2010-12-01 11:37 ` Peter Zijlstra
2010-12-01 14:08 ` Andi Kleen
2010-12-01 14:18 ` Peter Zijlstra
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