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Re: [tip:perf/core] perf/x86: Use INST_RETIRED.PREC_DIST for cycles: ppp

From Peter Zijlstra <peterz@infradead.org>
Newsgroups linux.kernel
Subject Re: [tip:perf/core] perf/x86: Use INST_RETIRED.PREC_DIST for cycles: ppp
Date 2015-12-08 14:30 +0100
Message-ID <qDqva-2Ue-61@gated-at.bofh.it> (permalink)
References (2 earlier) <qCHom-7oQ-27@gated-at.bofh.it> <qD4uD-59N-29@gated-at.bofh.it> <qDjai-6yA-9@gated-at.bofh.it> <qDmhQ-8tE-9@gated-at.bofh.it> <qDmhQ-8tE-7@gated-at.bofh.it>
Organization linux.* mail to news gateway

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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@firstfloor.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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[PATCH 1/2] perf, x86: Use INST_RETIRED.TOTAL_CYCLES_PS for cycles:pp for Skylake Andi Kleen <andi@firstfloor.org> - 2015-12-01 01:30 +0100
  [PATCH 2/2] x86, perf: Use INST_RETIRED.PREC_DIST for cycles:ppp Andi Kleen <andi@firstfloor.org> - 2015-12-01 01:30 +0100
    Re: [PATCH 2/2] x86, perf: Use INST_RETIRED.PREC_DIST for cycles:ppp Peter Zijlstra <peterz@infradead.org> - 2015-12-01 14:50 +0100
      Re: [PATCH 2/2] x86, perf: Use INST_RETIRED.PREC_DIST for cycles:ppp Peter Zijlstra <peterz@infradead.org> - 2015-12-01 16:00 +0100
      Re: [PATCH 2/2] x86, perf: Use INST_RETIRED.PREC_DIST for cycles:ppp Andi Kleen <ak@linux.intel.com> - 2015-12-01 16:00 +0100
    [tip:perf/core] perf/x86: Use INST_RETIRED.PREC_DIST for cycles:  ppp tip-bot for Andi Kleen <tipbot@zytor.com> - 2015-12-04 13:00 +0100
      Re: [tip:perf/core] perf/x86: Use INST_RETIRED.PREC_DIST for cycles:  ppp Ingo Molnar <mingo@kernel.org> - 2015-12-06 14:20 +0100
        Re: [tip:perf/core] perf/x86: Use INST_RETIRED.PREC_DIST for cycles:  ppp Peter Zijlstra <peterz@infradead.org> - 2015-12-06 23:10 +0100
          Re: [tip:perf/core] perf/x86: Use INST_RETIRED.PREC_DIST for cycles:  ppp Ingo Molnar <mingo@kernel.org> - 2015-12-07 07:50 +0100
            Re: [tip:perf/core] perf/x86: Use INST_RETIRED.PREC_DIST for cycles:  ppp Peter Zijlstra <peterz@infradead.org> - 2015-12-07 11:30 +0100
            Re: [tip:perf/core] perf/x86: Use INST_RETIRED.PREC_DIST for cycles:  ppp Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-12-07 15:10 +0100
              Re: [tip:perf/core] perf/x86: Use INST_RETIRED.PREC_DIST for cycles:  ppp Peter Zijlstra <peterz@infradead.org> - 2015-12-07 15:20 +0100
        Re: [tip:perf/core] perf/x86: Use INST_RETIRED.PREC_DIST for cycles:  ppp Peter Zijlstra <peterz@infradead.org> - 2015-12-07 15:00 +0100
          Re: [tip:perf/core] perf/x86: Use INST_RETIRED.PREC_DIST for cycles:  ppp Ingo Molnar <mingo@kernel.org> - 2015-12-08 06:40 +0100
            Re: [tip:perf/core] perf/x86: Use INST_RETIRED.PREC_DIST for cycles:  ppp Peter Zijlstra <peterz@infradead.org> - 2015-12-08 10:00 +0100
              Re: [tip:perf/core] perf/x86: Use INST_RETIRED.PREC_DIST for cycles:  ppp Peter Zijlstra <peterz@infradead.org> - 2015-12-08 14:30 +0100
                Re: [tip:perf/core] perf/x86: Use INST_RETIRED.PREC_DIST for cycles:  ppp Ingo Molnar <mingo@kernel.org> - 2015-12-09 09:30 +0100
            Re: [tip:perf/core] perf/x86: Use INST_RETIRED.PREC_DIST for cycles:  ppp Peter Zijlstra <peterz@infradead.org> - 2015-12-08 10:00 +0100
  Re: [PATCH 1/2] perf, x86: Use INST_RETIRED.TOTAL_CYCLES_PS for  cycles:pp for Skylake Peter Zijlstra <peterz@infradead.org> - 2015-12-01 14:20 +0100
  [tip:perf/core] perf/x86:   Use INST_RETIRED.TOTAL_CYCLES_PS for cycles:pp for Skylake tip-bot for Andi Kleen <tipbot@zytor.com> - 2015-12-04 13:00 +0100

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