linux-kernel - Re: [PATCHSET 00/19] perf stat: Cleanup counter aggregation (v2)

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Date:   Fri, 14 Oct 2022 11:10:14 -0700
From:   Namhyung Kim <namhyung@...nel.org>
To:     Jiri Olsa <olsajiri@...il.com>
Cc:     Michael Petlan <mpetlan@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        linux-perf-users <linux-perf-users@...r.kernel.org>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Leo Yan <leo.yan@...aro.org>, Andi Kleen <ak@...ux.intel.com>,
        Athira Rajeev <atrajeev@...ux.vnet.ibm.com>,
        James Clark <james.clark@....com>,
        Xing Zhengjun <zhengjun.xing@...ux.intel.com>
Subject: Re: [PATCHSET 00/19] perf stat: Cleanup counter aggregation (v2)

Hi Jiri and Michael,

On Thu, Oct 13, 2022 at 11:56 PM Jiri Olsa <olsajiri@...il.com> wrote:
>
> On Thu, Oct 13, 2022 at 11:15:31PM -0700, Namhyung Kim wrote:
> > Hello,
> >
> > Current perf stat code is somewhat hard to follow since it handles
> > many combinations of PMUs/events for given display and aggregation
> > options.  This is my attempt to clean it up a little. ;-)
> >
> > changes in v2)
> >  * fix a segfault in perf stat report for per-process record  (Jiri)
> >  * fix metric only display  (Jiri)
> >  * add evsel__reset_aggr_stat  (ian)
> >  * add more comments  (Ian)
> >  * add Acked-by from Ian
> >
> > My first concern is that aggregation and display routines are intermixed
> > and processed differently depends on the aggregation mode.  I'd like to
> > separate them apart and make the logic clearer.
> >
> > To do that, I added struct perf_stat_aggr to save the aggregated counter
> > values and other info.  It'll be allocated and processed according to
> > the aggr_mode and display logic will use it.
> >
> > I've tested the following combination.
> >
> >   $ cat test-matrix.sh
> >   #!/bin/sh
> >
> >   set -e
> >
> >   yes > /dev/null &
> >   TARGET=$!
> >
> >   ./perf stat true
> >   ./perf stat -a true
> >   ./perf stat -C0 true
> >   ./perf stat -p $TARGET true
> >   ./perf stat -t $TARGET true
> >
> >   ./perf stat -a -A true
> >   ./perf stat -a --per-node true
> >   ./perf stat -a --per-socket true
> >   ./perf stat -a --per-die true
> >   ./perf stat -a --per-core true
> >   ./perf stat -a --per-thread true
> >
> >   ./perf stat -a -I 500 sleep 1
> >   ./perf stat -a -I 500 --summary sleep 1
> >   ./perf stat -a -I 500 --per-socket sleep 1
> >   ./perf stat -a -I 500 --summary --per-socket sleep 1
> >
> >   ./perf stat -a --metric-only true
> >   ./perf stat -a --metric-only --per-socket true
> >   ./perf stat -a --metric-only -I 500 sleep 1
> >   ./perf stat -a --metric-only -I 500 --per-socket sleep 1
> >
> >   ./perf stat record true && ./perf stat report
> >   ./perf stat record -p $TARGET true && ./perf stat report
> >   ./perf stat record -a true && ./perf stat report
> >   ./perf stat record -a --per-core true && ./perf stat report
> >   ./perf stat record -a --per-core --metric-only true && ./perf stat report
> >   ./perf stat record -a -I 500 sleep 1 && ./perf stat report
> >   ./perf stat record -a -I 500 --per-core sleep 1 && ./perf stat report
> >   ./perf stat record -a -I 500 --per-core --metric-only sleep 1 && ./perf stat report
> >
> >   ./perf stat -a -A -e cpu/event=cpu-cycles,percore/ true
> >   ./perf stat -a -A -e cpu/event=cpu-cycles,percore/ --percore-show-thread true
> >
> >   kill $TARGET
> >
> > The code is available at 'perf/stat-aggr-v2' branch in
> >
> >   git://git.kernel.org/pub/scm/linux/kernel/git/namhyung/linux-perf.git
>
> Michael,
> ay chance you could run your test suite on top of this change?

I've noticed there's an issue with cgroups.  Will send a fix soon.

Thanks,
Namhyung