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

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Message-ID: <20151208053604.GA15632@gmail.com>
Date:	Tue, 8 Dec 2015 06:36:04 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Peter Zijlstra <peterz@...radead.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


* Peter Zijlstra <peterz@...radead.org> wrote:

> On Sun, Dec 06, 2015 at 02:11:02PM +0100, Ingo Molnar wrote:
> 
> > the symptom is that latest 'perf top' and 'perf record' produces no samples.
> > 
> > So I've removed this commit and the related Skylake commit from -tip:
> > 
> >  4576ceaa56a8 perf/x86: Use INST_RETIRED.PREC_DIST for cycles:ppp
> >  ac1e1d30cf90 perf/x86: Use INST_RETIRED.TOTAL_CYCLES_PS for cycles:pp for Skylake
> > 
> > you need to do better testing next time around. Note: if you resubmit the patches, 
> > please also pick up the updates commit changelogs from the tip-bot emails, don't 
> > use your original changelogs.
> 
> OK, so I need:
> 
>  lkml.kernel.org/r/1449177740-5422-1-git-send-email-andi@...stfloor.org
>  lkml.kernel.org/r/1449177740-5422-2-git-send-email-andi@...stfloor.org
> 
> On my IVB because that keeps triggering that case with :ppp, other than
> that this seems to work fine on IVB.
> 
> I've also tried on SNB (which does not support the new :ppp thing) and
> that too works.
> 
> Sadly I do not have older hardware anymore :/ 
> 
> 
> Also, perf tools DTRT and will use :ppp by default if available.

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?

Thanks,

	Ingo
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