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	2015-12-06 23:10 +0100
Message-ID	<qCPFg-4ke-9@gated-at.bofh.it> (permalink)
References	<qAGZs-2kK-13@gated-at.bofh.it> <qBXbS-2b5-43@gated-at.bofh.it> <qCHom-7oQ-27@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Sun, Dec 06, 2015 at 02:11:02PM +0100, Ingo Molnar wrote:
> Also, I'm not convinced we need a new 'ppp' qualifier for any of this, why not 
> just replace 'pp' with this event - 'pp' is meant to be our most precise event.

I requested this because the PREC_DIST events can only be scheduled on a
single counter, whereas the existing :pp events can be had on all 4.

This mean you can have 2 concurrent :pp users (without RR), but not :ppp.
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Thread

[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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