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Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during per-process profiling of STREAM benchmark on Intel Xeon Phi

From Mark Rutland <mark.rutland@arm.com>
Newsgroups linux.kernel
Subject Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during per-process profiling of STREAM benchmark on Intel Xeon Phi
Date 2017-06-19 15:30 +0200
Message-ID <tU4UG-3bd-21@gated-at.bofh.it> (permalink)
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On Mon, Jun 19, 2017 at 04:08:32PM +0300, Alexey Budankov wrote:
> On 16.06.2017 1:10, Alexey Budankov wrote:
> >On 15.06.2017 22:56, Mark Rutland wrote:
> >>On Thu, Jun 15, 2017 at 08:41:42PM +0300, Alexey Budankov wrote:
> >>>This series of patches continues v2 and addresses captured comments.

> >>>Specifically this patch replaces pinned_groups and flexible_groups
> >>>lists of perf_event_context by red-black cpu indexed trees avoiding
> >>>data structures duplication and introducing possibility to iterate
> >>>event groups for a specific CPU only.

> >>Have you thrown Vince's perf fuzzer at this?
> >>
> >>If you haven't, please do. It can be found in the fuzzer directory of:
> >>
> >>https://github.com/deater/perf_event_tests
> >
> >Accepted.
> 
> I run the test suite and it revealed no additional regressions in
> comparison to what I have on the clean kernel.
> 
> However the fuzzer constantly reports some strange stacks that are
> not seen on the clean kernel and I have no idea how that might be
> caused by the patches.

Ok; that was the kind of thing I was concerned about.

What you say "strange stacks", what do you mean exactly?

I take it the kernel spewing backtraces in dmesg?

Can you dump those?

Thanks,
Mark.

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[PATCH v3 1/n] perf/core: addressing 4x slowdown during per-process  profiling of STREAM benchmark on Intel Xeon Phi Alexey Budankov <alexey.budankov@linux.intel.com> - 2017-06-15 19:50 +0200
  Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during  per-process profiling of STREAM benchmark on Intel Xeon Phi Mark Rutland <mark.rutland@arm.com> - 2017-06-15 22:00 +0200
    Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during  per-process profiling of STREAM benchmark on Intel Xeon Phi Alexey Budankov <alexey.budankov@linux.intel.com> - 2017-06-16 00:20 +0200
      Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during  per-process profiling of STREAM benchmark on Intel Xeon Phi Mark Rutland <mark.rutland@arm.com> - 2017-06-16 11:20 +0200
        Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during  per-process profiling of STREAM benchmark on Intel Xeon Phi Alexey Budankov <alexey.budankov@linux.intel.com> - 2017-06-16 16:10 +0200
          Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during  per-process profiling of STREAM benchmark on Intel Xeon Phi Alexey Budankov <alexey.budankov@linux.intel.com> - 2017-06-16 16:30 +0200
            Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during  per-process profiling of STREAM benchmark on Intel Xeon Phi Mark Rutland <mark.rutland@arm.com> - 2017-06-19 14:50 +0200
              Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during  per-process profiling of STREAM benchmark on Intel Xeon Phi Mark Rutland <mark.rutland@arm.com> - 2017-06-19 15:40 +0200
                Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during  per-process profiling of STREAM benchmark on Intel Xeon Phi Alexey Budankov <alexey.budankov@linux.intel.com> - 2017-06-19 16:10 +0200
                Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during  per-process profiling of STREAM benchmark on Intel Xeon Phi Andi Kleen <ak@linux.intel.com> - 2017-06-19 17:00 +0200
                Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during  per-process profiling of STREAM benchmark on Intel Xeon Phi Mark Rutland <mark.rutland@arm.com> - 2017-06-19 17:20 +0200
                Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during  per-process profiling of STREAM benchmark on Intel Xeon Phi Andi Kleen <ak@linux.intel.com> - 2017-06-19 17:30 +0200
                Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during  per-process profiling of STREAM benchmark on Intel Xeon Phi Mark Rutland <mark.rutland@arm.com> - 2017-06-19 17:30 +0200
                Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during  per-process profiling of STREAM benchmark on Intel Xeon Phi Andi Kleen <ak@linux.intel.com> - 2017-06-19 17:50 +0200
                Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during  per-process profiling of STREAM benchmark on Intel Xeon Phi Mark Rutland <mark.rutland@arm.com> - 2017-06-19 18:00 +0200
      Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during  per-process profiling of STREAM benchmark on Intel Xeon Phi Alexey Budankov <alexey.budankov@linux.intel.com> - 2017-06-19 15:10 +0200
        Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during  per-process profiling of STREAM benchmark on Intel Xeon Phi Mark Rutland <mark.rutland@arm.com> - 2017-06-19 15:30 +0200
          Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during  per-process profiling of STREAM benchmark on Intel Xeon Phi Alexey Budankov <alexey.budankov@linux.intel.com> - 2017-06-19 15:40 +0200
            Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during  per-process profiling of STREAM benchmark on Intel Xeon Phi Alexey Budankov <alexey.budankov@linux.intel.com> - 2017-06-19 17:10 +0200
              Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during  per-process profiling of STREAM benchmark on Intel Xeon Phi Andi Kleen <ak@linux.intel.com> - 2017-06-19 17:30 +0200
                Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during  per-process profiling of STREAM benchmark on Intel Xeon Phi Alexey Budankov <alexey.budankov@linux.intel.com> - 2017-06-19 17:40 +0200
            Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during  per-process profiling of STREAM benchmark on Intel Xeon Phi Mark Rutland <mark.rutland@arm.com> - 2017-06-19 17:20 +0200
              Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during  per-process profiling of STREAM benchmark on Intel Xeon Phi Alexey Budankov <alexey.budankov@linux.intel.com> - 2017-06-19 17:30 +0200
    Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during  per-process profiling of STREAM benchmark on Intel Xeon Phi Alexey Budankov <alexey.budankov@linux.intel.com> - 2017-06-19 22:40 +0200

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