Re: [perf metricgroup] fcc9c5243c: perf-sanity-tests.Parse_and_process_metrics.fail

[John Garry]

On 19/10/2020 00:30, Ian Rogers wrote:
> On Sun, Oct 18, 2020 at 1:51 AM kernel test robot <rong.a.chen@xxxxxxxxx> wrote:
> > Greeting,
> >
> > FYI, we noticed the following commit (built with gcc-9):
> >
> > commit: fcc9c5243c478f104014daf4d23db86098d2aef0 ("perf metricgroup: Hack a fix for aliases when covering multiple PMUs")
> > url: https://github.com/0day-ci/linux/commits/John-Garry/perf-pmu-events-Support-event-aliasing-for-system-PMUs/20201008-182049
> >
> >
> > in testcase: perf-sanity-tests
> > version: perf-x86_64-c85fb28b6f99-1_20201008
> > with following parameters:
> >
> >          perf_compiler: gcc
> >          ucode: 0xdc
> >
> >
> >
> > on test machine: 4 threads Intel(R) Core(TM) i5-6500 CPU @ 3.20GHz with 32G memory
> >
> > caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
>
> I believe this is a Skylake and there is a known bug in the Skylake
> metric DRAM_Parallel_Reads as described here:
> https://lore.kernel.org/lkml/CAP-5=fXejVaQa9qfW66cY77qB962+jbe8tT5bsLoOOcFmODnWQ@xxxxxxxxxxxxxx/
> Fixing the bug needs more knowledge than what is available in manuals.
> Hopefully Intel can take a look.
>
> Thanks,
> Ian

So this named patch ("perf metricgroup: Hack a fix for aliases...") is 
breaking test #67 on my machine also, which is a broadwell.

I will have a look, but I was hoping that Ian would have a proper fix 
for this on top of ("perf metricgroup: Fix uncore metric expressions"), 
which now looks to be merged.

Thanks!

> > If you fix the issue, kindly add following tag
> > Reported-by: kernel test robot <rong.a.chen@xxxxxxxxx>
> >
> >
> > 2020-10-16 19:31:52 sudo /usr/src/perf_selftests-x86_64-rhel-8.3-fcc9c5243c478f104014daf4d23db86098d2aef0/tools/perf/perf test 67
> > 67: Parse and process metrics                             : FAILED!
> > 2020-10-16 19:31:52 sudo /usr/src/perf_selftests-x86_64-rhel-8.3-fcc9c5243c478f104014daf4d23db86098d2aef0/tools/perf/perf test 68
> > 68: x86 rdpmc                                             : Ok
> > 2020-10-16 19:31:52 sudo /usr/src/perf_selftests-x86_64-rhel-8.3-fcc9c5243c478f104014daf4d23db86098d2aef0/tools/perf/perf test 69
> > 69: Convert perf time to TSC                              : Ok
> > 2020-10-16 19:31:52 sudo /usr/src/perf_selftests-x86_64-rhel-8.3-fcc9c5243c478f104014daf4d23db86098d2aef0/tools/perf/perf test 70
> > 70: DWARF unwind                                          : Ok
> > 2020-10-16 19:31:52 sudo /usr/src/perf_selftests-x86_64-rhel-8.3-fcc9c5243c478f104014daf4d23db86098d2aef0/tools/perf/perf test 71
> > 71: x86 instruction decoder - new instructions            : Ok
> > 2020-10-16 19:31:52 sudo /usr/src/perf_selftests-x86_64-rhel-8.3-fcc9c5243c478f104014daf4d23db86098d2aef0/tools/perf/perf test 72
> > 72: Intel PT packet decoder                               : Ok
> > 2020-10-16 19:31:52 sudo /usr/src/perf_selftests-x86_64-rhel-8.3-fcc9c5243c478f104014daf4d23db86098d2aef0/tools/perf/perf test 73
> > 73: x86 bp modify                                         : Ok
> > 2020-10-16 19:31:53 sudo /usr/src/perf_selftests-x86_64-rhel-8.3-fcc9c5243c478f104014daf4d23db86098d2aef0/tools/perf/perf test 74
> > 74: probe libc's inet_pton & backtrace it with ping       : Ok
> > 2020-10-16 19:31:54 sudo /usr/src/perf_selftests-x86_64-rhel-8.3-fcc9c5243c478f104014daf4d23db86098d2aef0/tools/perf/perf test 75
> > 75: Zstd perf.data compression/decompression              : Ok
> >
> >
> >
> > To reproduce:
> >
> >          git clone https://github.com/intel/lkp-tests.git
> >          cd lkp-tests
> >          bin/lkp install job.yaml  # job file is attached in this email
> >          bin/lkp run     job.yaml
> >
> >
> >
> > Thanks,
> > Rong Chen
> .