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

From Ingo Molnar <mingo@kernel.org>
Newsgroups linux.kernel
Subject Re: [tip:perf/core] perf/x86: Use INST_RETIRED.PREC_DIST for cycles: ppp
Date 2015-12-09 09:30 +0100
Message-ID <qDIim-5Rn-13@gated-at.bofh.it> (permalink)
References (3 earlier) <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> <qDqva-2Ue-61@gated-at.bofh.it>
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* Peter Zijlstra <peterz@infradead.org> wrote:

> 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.

Hm, so I tried again your latest perf/urgent (1221fc3b3e3a) merged into tip:master 
(c9586e904a68), and booted it on the NHM, but 'perf top' refuses to break.

One thing that was special about my first NHM test was that it conducted an about 
24 hours perf stress. OTOH 'cycles:p' did work, it was only 'cycles:pp' that was 
producing no events whatsoever - so it wasn't a total breakage, only :pp related.

Weird ...

Thanks,

	Ingo
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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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