linux-kernel - Re: [PATCH v4 26/48] perf evsel: Derive CPUs and threads in alloc

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Date:   Sun, 9 Jan 2022 21:49:48 -0800
From:   Ian Rogers <irogers@...gle.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Andi Kleen <ak@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        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@...r.kernel.org, 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, zhengjun.xing@...el.com,
        eranian@...gle.com
Subject: Re: [PATCH v4 26/48] perf evsel: Derive CPUs and threads in alloc_counts

On Sun, Jan 9, 2022 at 10:30 AM Jiri Olsa <jolsa@...hat.com> wrote:
>
> On Tue, Jan 04, 2022 at 10:13:29PM -0800, Ian Rogers wrote:
>
> SNIP
>
> > diff --git a/tools/perf/util/counts.h b/tools/perf/util/counts.h
> > index 7ff36bf6d644..3e275e9c60d1 100644
> > --- a/tools/perf/util/counts.h
> > +++ b/tools/perf/util/counts.h
> > @@ -40,7 +40,7 @@ void perf_counts__delete(struct perf_counts *counts);
> >  void perf_counts__reset(struct perf_counts *counts);
> >
> >  void evsel__reset_counts(struct evsel *evsel);
> > -int evsel__alloc_counts(struct evsel *evsel, int ncpus, int nthreads);
> > +int evsel__alloc_counts(struct evsel *evsel);
> >  void evsel__free_counts(struct evsel *evsel);
> >
> >  #endif /* __PERF_COUNTS_H */
> > diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
> > index 656c30b988ce..6c9af21776e6 100644
> > --- a/tools/perf/util/evsel.c
> > +++ b/tools/perf/util/evsel.c
> > @@ -1578,7 +1578,7 @@ int __evsel__read_on_cpu(struct evsel *evsel, int cpu, int thread, bool scale)
> >       if (FD(evsel, cpu, thread) < 0)
> >               return -EINVAL;
> >
> > -     if (evsel->counts == NULL && evsel__alloc_counts(evsel, cpu + 1, thread + 1) < 0)
> > +     if (evsel->counts == NULL && evsel__alloc_counts(evsel) < 0)
>
> ugh, nice.. good that it's used only from test code ;-)
>
> btw I noticed evsel__read_on_cpu_scaled is not used at all

I'd noticed that too, but wanted to stay away from making the patch
set larger.  You end up removing the argument to
__evsel__read_on_cpu, etc. Definitely worth cleaning up, but maybe we
can do it later.

Thanks,
Ian

> jirka
>
> >               return -ENOMEM;
> >
> >       if (readn(FD(evsel, cpu, thread), &count, nv * sizeof(u64)) <= 0)
> > diff --git a/tools/perf/util/stat.c b/tools/perf/util/stat.c
> > index c69b221f5e3e..995cb5003133 100644
> > --- a/tools/perf/util/stat.c
> > +++ b/tools/perf/util/stat.c
> > @@ -152,11 +152,13 @@ static void evsel__free_stat_priv(struct evsel *evsel)
> >       zfree(&evsel->stats);
> >  }
> >
> > -static int evsel__alloc_prev_raw_counts(struct evsel *evsel, int ncpus, int nthreads)
> > +static int evsel__alloc_prev_raw_counts(struct evsel *evsel)
> >  {
> > +     int cpu_map_nr = evsel__nr_cpus(evsel);
> > +     int nthreads = perf_thread_map__nr(evsel->core.threads);
> >       struct perf_counts *counts;
> >
> > -     counts = perf_counts__new(ncpus, nthreads);
> > +     counts = perf_counts__new(cpu_map_nr, nthreads);
> >       if (counts)
> >               evsel->prev_raw_counts = counts;
> >
> > @@ -177,12 +179,9 @@ static void evsel__reset_prev_raw_counts(struct evsel *evsel)
> >
> >  static int evsel__alloc_stats(struct evsel *evsel, bool alloc_raw)
> >  {
> > -     int ncpus = evsel__nr_cpus(evsel);
> > -     int nthreads = perf_thread_map__nr(evsel->core.threads);
> > -
> >       if (evsel__alloc_stat_priv(evsel) < 0 ||
> > -         evsel__alloc_counts(evsel, ncpus, nthreads) < 0 ||
> > -         (alloc_raw && evsel__alloc_prev_raw_counts(evsel, ncpus, nthreads) < 0))
> > +         evsel__alloc_counts(evsel) < 0 ||
> > +         (alloc_raw && evsel__alloc_prev_raw_counts(evsel) < 0))
> >               return -ENOMEM;
> >
> >       return 0;
> > --
> > 2.34.1.448.ga2b2bfdf31-goog
> >
>