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Re: [PATCH 2/3] perf/core: introduce pmu_event_flags and PMUEF_READ_CPU_PKG

From Peter Zijlstra <peterz@infradead.org>
Newsgroups linux.kernel
Subject Re: [PATCH 2/3] perf/core: introduce pmu_event_flags and PMUEF_READ_CPU_PKG
Date 2016-08-04 17:10 +0200
Message-ID <s2srw-2sp-27@gated-at.bofh.it> (permalink)
References <s1ypj-786-3@gated-at.bofh.it> <s1ypj-786-11@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On Mon, Aug 01, 2016 at 07:44:54PM -0700, David Carrillo-Cisneros wrote:
> Introduce the flag PMUEF_READ_CPU_PKG, useful for uncore events, that
> allows a PMU to signal the generic perf code that an event is readable
> on the current CPU if the event is:
>   - active in a CPU in the same package as the current CPU (local CPU)

Ok that I get..

>   - not active but is attached to a CPU (i.e. event->cpu != -1) in the
>   same package as the current CPU.

but this, not so much. Why would you want to read an inactive counter?

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Thread

[PATCH 0/3] remove unnecessary IPI reading uncore events David Carrillo-Cisneros <davidcc@google.com> - 2016-08-02 05:20 +0200
  [PATCH 3/3] perf/x86: use PMUEF_READ_CPU_PKG in uncore events David Carrillo-Cisneros <davidcc@google.com> - 2016-08-02 05:20 +0200
  [PATCH 2/3] perf/core: introduce pmu_event_flags and PMUEF_READ_CPU_PKG David Carrillo-Cisneros <davidcc@google.com> - 2016-08-02 05:20 +0200
    Re: [PATCH 2/3] perf/core: introduce pmu_event_flags and  PMUEF_READ_CPU_PKG Peter Zijlstra <peterz@infradead.org> - 2016-08-04 17:10 +0200
      Re: [PATCH 2/3] perf/core: introduce pmu_event_flags and PMUEF_READ_CPU_PKG David Carrillo-Cisneros <davidcc@google.com> - 2016-08-04 19:30 +0200
    Re: [PATCH 2/3] perf/core: introduce pmu_event_flags and  PMUEF_READ_CPU_PKG Peter Zijlstra <peterz@infradead.org> - 2016-08-04 17:10 +0200
      Re: [PATCH 2/3] perf/core: introduce pmu_event_flags and  PMUEF_READ_CPU_PKG Peter Zijlstra <peterz@infradead.org> - 2016-08-04 19:30 +0200
        Re: [PATCH 2/3] perf/core: introduce pmu_event_flags and PMUEF_READ_CPU_PKG David Carrillo-Cisneros <davidcc@google.com> - 2016-08-04 19:50 +0200
      Re: [PATCH 2/3] perf/core: introduce pmu_event_flags and PMUEF_READ_CPU_PKG David Carrillo-Cisneros <davidcc@google.com> - 2016-08-04 19:40 +0200
    Re: [PATCH 2/3] perf/core: introduce pmu_event_flags and  PMUEF_READ_CPU_PKG Peter Zijlstra <peterz@infradead.org> - 2016-08-04 17:50 +0200
  [PATCH 1/3] perf/core: check return value of perf_event_read IPI David Carrillo-Cisneros <davidcc@google.com> - 2016-08-02 06:40 +0200
  Re: [PATCH 0/3] remove unnecessary IPI reading uncore events Andi Kleen <ak@linux.intel.com> - 2016-08-02 17:30 +0200

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