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Re: [RFC PATCH 0/6] perf: Add AUX data sampling

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On Fri, Sep 23, 2016 at 02:27:20PM +0300, Alexander Shishkin wrote:
> Hi Peter,
> 
> This is an RFC, I'm not sending the tooling bits in this series,
> although they can be found here [1].
> 
> This series introduces AUX data sampling for perf events, which in
> case of our instruction/branch tracing PMUs like Intel PT, BTS, CS
> ETM means execution flow history leading up to a perf event's
> overflow.

This fails to explain _WHY_ this is a good thing to have. What kind of
analysis does this enable, and is that fully implemented in [1] (I
didn't look).

Please provide a bit more justification.

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[RFC PATCH 0/6] perf: Add AUX data sampling Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2016-09-23 13:30 +0200
  [RFC PATCH 1/6] perf: Move mlock accounting to ring buffer allocation Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2016-09-23 13:30 +0200
    Re: [RFC PATCH 1/6] perf: Move mlock accounting to ring buffer  allocation Peter Zijlstra <peterz@infradead.org> - 2016-09-23 14:20 +0200
      Re: [RFC PATCH 1/6] perf: Move mlock accounting to ring buffer allocation Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2016-09-23 16:40 +0200
        Re: [RFC PATCH 1/6] perf: Move mlock accounting to ring buffer  allocation Peter Zijlstra <peterz@infradead.org> - 2016-09-23 17:30 +0200
          Re: [RFC PATCH 1/6] perf: Move mlock accounting to ring buffer allocation Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2016-09-23 18:00 +0200
      Re: [RFC PATCH 1/6] perf: Move mlock accounting to ring buffer  allocation Andi Kleen <ak@linux.intel.com> - 2016-09-23 19:30 +0200
        Re: [RFC PATCH 1/6] perf: Move mlock accounting to ring buffer  allocation Peter Zijlstra <peterz@infradead.org> - 2016-09-23 22:30 +0200
          Re: [RFC PATCH 1/6] perf: Move mlock accounting to ring buffer allocation Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2016-09-26 10:30 +0200
            Re: [RFC PATCH 1/6] perf: Move mlock accounting to ring buffer  allocation Peter Zijlstra <peterz@infradead.org> - 2016-09-26 11:10 +0200
              Re: [RFC PATCH 1/6] perf: Move mlock accounting to ring buffer allocation Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2016-09-26 14:50 +0200
              Re: [RFC PATCH 1/6] perf: Move mlock accounting to ring buffer allocation Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2016-09-26 18:20 +0200
  [RFC PATCH 2/6] perf: Add api to (de-)allocate AUX buffers for kernel counters Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2016-09-23 13:40 +0200
  [RFC PATCH 3/6] perf: Add a helper for looking up pmus by type Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2016-09-23 13:40 +0200
  [RFC PATCH 4/6] perf: Add infrastructure for using AUX data in perf samples Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2016-09-23 13:40 +0200
  [RFC PATCH 5/6] perf: Disable PMU around address filter adjustment Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2016-09-23 13:40 +0200
  [RFC PATCH 6/6] perf: Disable IRQs in address filter sync path Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2016-09-23 13:40 +0200
    Re: [RFC PATCH 6/6] perf: Disable IRQs in address filter sync path Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2016-09-26 18:30 +0200
      Re: [RFC PATCH 6/6] perf: Disable IRQs in address filter sync path Mathieu Poirier <mathieu.poirier@linaro.org> - 2016-10-04 18:50 +0200
  Re: [RFC PATCH 0/6] perf: Add AUX data sampling Peter Zijlstra <peterz@infradead.org> - 2016-09-23 13:50 +0200
    Re: [RFC PATCH 0/6] perf: Add AUX data sampling Andi Kleen <ak@linux.intel.com> - 2016-09-23 19:20 +0200
      Re: [RFC PATCH 0/6] perf: Add AUX data sampling Peter Zijlstra <peterz@infradead.org> - 2016-09-23 22:40 +0200
        Re: [RFC PATCH 0/6] perf: Add AUX data sampling Andi Kleen <ak@linux.intel.com> - 2016-09-24 00:40 +0200

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