linux-kernel - Re: [tip:perf/core] perf/x86: Use INST_RETIRED.PREC

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Date:	Tue, 8 Dec 2015 14:27:53 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	vincent.weaver@...ne.edu, jolsa@...hat.com,
	torvalds@...ux-foundation.org, eranian@...gle.com,
	tglx@...utronix.de, acme@...hat.com, ak@...ux.intel.com,
	linux-kernel@...r.kernel.org, hpa@...or.com,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:perf/core] perf/x86: Use INST_RETIRED.PREC_DIST for cycles:
 ppp

On Tue, Dec 08, 2015 at 09:57:07AM +0100, Peter Zijlstra wrote:
> On Tue, Dec 08, 2015 at 09:50:26AM +0100, Peter Zijlstra wrote:
> > On Tue, Dec 08, 2015 at 06:36:04AM +0100, Ingo Molnar wrote:
> > 
> > > So I checked my NHM box with your latest queue and it now works correctly. Do you 
> > > have any idea what the difference is/was?
> > 
> > Sadly, no clue :/
> > 
> > I went over those patches and cannot find anything that should affect
> > NHM (or <=SNB in fact).
> 
> Oh wait, I spoke too soon, the two new patches affect everything with
> PEBS. And esp. the latter one:
> 
>   lkml.kernel.org/r/1449177740-5422-2-git-send-email-andi@...stfloor.org
> 

If that is the patch that makes your NHM go again, then running 2
concurrent perf-top sessions should make it all go dark again.
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