linux-kernel - Re: [DRAFT PATCH 2/3] perf: Implement Nehalem uncore pmu

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Date:	Fri, 05 Nov 2010 09:30:29 +0800
From:	Lin Ming <ming.m.lin@...el.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Stephane Eranian <eranian@...gle.com>,
	Ingo Molnar <mingo@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Arjan van de Ven <arjan@...radead.org>,
	"robert.richter@....com" <robert.richter@....com>,
	Cyrill Gorcunov <gorcunov@...il.com>,
	"paulus@...ba.org" <paulus@...ba.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [DRAFT PATCH 2/3] perf: Implement Nehalem uncore pmu

On Fri, 2010-11-05 at 03:28 +0800, Peter Zijlstra wrote:
> On Tue, 2010-11-02 at 17:59 +0100, Stephane Eranian wrote:
> > I think using uncore PMU to measure per-thread is pretty much useless.
> > Maybe it should not even be allowed. There is no way you can correlate
> > the counts you're getting to a place in your program. Or put differently,
> > sampling in per-thread mode using uncore is useless. 
> 
> Right, per-task uncore event should not be allowed. I think it as simple
> as setting pmu::task_ctx_nr = perf_invalid_context.

Thanks for the comments from you and Stephane.
I'll update the patches.

Lin Ming


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