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

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Date:   Tue, 23 Mar 2021 20:54:18 -0500
From:   "Paul A. Clarke" <pc@...ibm.com>
To:     John Garry <john.garry@...wei.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 Tue, Mar 23, 2021 at 03:15:16PM +0000, John Garry wrote:
> 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...

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
--

PC