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

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Message-ID: <20151207135107.GA6356@twins.programming.kicks-ass.net>
Date:	Mon, 7 Dec 2015 14:51:07 +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 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.
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