linux-kernel - Re: [PATCHv4 00/19] perf metric: Add support to reuse metric

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Date:   Wed, 24 Mar 2021 09:13:04 +0000
From:   John Garry <john.garry@...wei.com>
To:     "Paul A. Clarke" <pc@...ibm.com>
CC:     Jiri Olsa <jolsa@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        "Namhyung Kim" <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Michael Petlan <mpetlan@...hat.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        Stephane Eranian <eranian@...gle.com>,
        Ian Rogers <irogers@...gle.com>
Subject: Re: [PATCHv4 00/19] perf metric: Add support to reuse metric

On 24/03/2021 01:54, Paul A. Clarke wrote:
>>> --
>> Since commit 8989f5f07605 ("perf stat: Update POWER9 metrics to utilize
>> other metrics"), power9 has reused metrics.
>>
>> And I am finding that subtest 10.3 caused problems when I tried to introduce
>> metric reuse on arm64, so I was just asking you to check.
>>
>> Now I am a bit confused...
> I now understand your original request!:-)
> 
> The above test was run on a POWER8 system.
> 
> I do see failures on a POWER9 system:
> --
> $ ./perf test 10
> 10: PMU events                                                      :
> 10.1: PMU event table sanity                                        : Ok
> 10.2: PMU event map aliases                                         : Ok
> 10.3: Parsing of PMU event table metrics                            : Skip (some metrics failed)
> 10.4: Parsing of PMU event table metrics with fake PMUs             : Ok
> $ ./perf test --verbose 10 2>&1 | grep -i '^Parse event failed' | wc -l
> 112

ok, thanks for confirming.

I'm looking at fixing it, and the solution doesn't look simple :(

John