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

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Date:   Tue, 23 Mar 2021 15:15:16 +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 23/03/2021 15:06, Paul A. Clarke wrote:
> On Mon, Mar 22, 2021 at 11:36:23AM +0000, John Garry wrote:
>> On 01/08/2020 12:40, Paul A. Clarke wrote:
>>>> v4 changes:
>>>>     - removed acks from patch because it changed a bit
>>>>       with the last fixes:
>>>>         perf metric: Collect referenced metrics in struct metric_ref_node
>>>>     - fixed runtime metrics [Kajol Jain]
>>>>     - increased recursion depth [Paul A. Clarke]
>>>>     - changed patches due to dependencies:
>>>>         perf metric: Collect referenced metrics in struct metric_ref_node
>>>>         perf metric: Add recursion check when processing nested metrics
>>>>         perf metric: Rename struct egroup to metric
>>>>         perf metric: Rename group_list to metric_list
>>>>
>>>> Also available in here:
>>>>     git://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git
>>>>     perf/metric
>>> I built and ran from the above git branch, and things seem to work.
>>> Indeed, I was able to apply my changes to exploit the new capabilities
>>> via modifications to tools/perf/pmu-events/arch/powerpc/power9/metrics.json,
>>> as I posted earlier (and will submit once this set gets merged).
>> I was just wondering: Does perf subtest 10.3 work ok for you with the metric
>> reuse?
>>
>> That's "Parsing of PMU event table metrics" subtest.
> I confess I'm not sure what you are asking. Using the latest mainline
> (84196390620ac0e5070ae36af84c137c6216a7dc), perf subtest 10.3 does
> pass for me:
> --
> $ ./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                            : Ok
> 10.4: Parsing of PMU event table metrics with fake PMUs             : Ok
> --
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...

Thanks for checking,
john