linux-kernel - Re: [PATCH v2 25/48] perf stat-display: Avoid use of core for CPU.

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Date:   Wed, 29 Dec 2021 22:22:54 -0800
From:   Ian Rogers <irogers@...gle.com>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Andi Kleen <ak@...ux.intel.com>, Jiri Olsa <jolsa@...hat.com>,
        John Garry <john.garry@...wei.com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        "Paul A . Clarke" <pc@...ibm.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Riccardo Mancini <rickyman7@...il.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        linux-perf-users <linux-perf-users@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Vineet Singh <vineet.singh@...el.com>,
        James Clark <james.clark@....com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Mike Leach <mike.leach@...aro.org>,
        Leo Yan <leo.yan@...aro.org>, coresight@...ts.linaro.org,
        linux-arm-kernel@...ts.infradead.org,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH v2 25/48] perf stat-display: Avoid use of core for CPU.

On Tue, Dec 28, 2021 at 4:09 PM Namhyung Kim <namhyung@...nel.org> wrote:
>
> On Wed, Dec 22, 2021 at 11:47 PM Ian Rogers <irogers@...gle.com> wrote:
> >
> > Correct use of cpumap index in print_no_aggr_metric.
> >
> > Signed-off-by: Ian Rogers <irogers@...gle.com>
> > ---
> [SNIP]
> > @@ -924,29 +921,32 @@ static void print_no_aggr_metric(struct perf_stat_config *config,
> >                                  struct evlist *evlist,
> >                                  char *prefix)
> >  {
> > -       int cpu;
> > -       int nrcpus = 0;
> > -       struct evsel *counter;
> > -       u64 ena, run, val;
> > -       double uval;
> > -       struct aggr_cpu_id id;
> > +       int cpu, nrcpus;
> >
> >         nrcpus = evlist->core.cpus->nr;
> >         for (cpu = 0; cpu < nrcpus; cpu++) {
> > +               struct evsel *counter;
> >                 bool first = true;
> >
> >                 if (prefix)
> >                         fputs(prefix, config->output);
> >                 evlist__for_each_entry(evlist, counter) {
> > -                       id = aggr_cpu_id__empty();
> > -                       id.core = cpu;
> > +                       u64 ena, run, val;
> > +                       double uval;
> > +                       struct aggr_cpu_id id;
> > +                       int idx = perf_cpu_map__idx(evsel__cpus(counter), cpu);
>
> Not sure about this.  Here the 'cpu' is an index for the
> evlist->core.cpus, not a CPU number.  But the
> perf_cpu_map__idx() requires a CPU number, right?

Thanks for the reviews! You are right, I think it makes sense two have
two indices here, evlist and counter. I will change the outer loop to
use perf_cpu_map__for_each_cpu. v3 will have the other fixes you've
pointed out too.

Thanks,
Ian


> Thanks,
> Namhyung
>
>
> > +
> > +                       if (idx < 0)
> > +                               continue;
> > +
> > +                       id = aggr_cpu_id__cpu(cpu, /*data=*/NULL);
> >                         if (first) {
> >                                 aggr_printout(config, counter, id, 0);
> >                                 first = false;
> >                         }
> > -                       val = perf_counts(counter->counts, cpu, 0)->val;
> > -                       ena = perf_counts(counter->counts, cpu, 0)->ena;
> > -                       run = perf_counts(counter->counts, cpu, 0)->run;
> > +                       val = perf_counts(counter->counts, idx, 0)->val;
> > +                       ena = perf_counts(counter->counts, idx, 0)->ena;
> > +                       run = perf_counts(counter->counts, idx, 0)->run;
> >
> >                         uval = val * counter->scale;
> >                         printout(config, id, 0, counter, uval, prefix,
> > --
> > 2.34.1.307.g9b7440fafd-goog
> >