linux-kernel - Re: [PATCH 3/5] perf tools: Copy metric events properly when expand cgroups

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Date:   Wed, 23 Sep 2020 07:46:31 +0900
From:   Namhyung Kim <namhyung@...nel.org>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Stephane Eranian <eranian@...gle.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Ian Rogers <irogers@...gle.com>,
        John Garry <john.garry@...wei.com>,
        Kajol Jain <kjain@...ux.ibm.com>
Subject: Re: [PATCH 3/5] perf tools: Copy metric events properly when expand cgroups

On Wed, Sep 23, 2020 at 6:29 AM Jiri Olsa <jolsa@...hat.com> wrote:
>
> On Mon, Sep 21, 2020 at 06:46:08PM +0900, Namhyung Kim wrote:
>
> SNIP
>
> > @@ -260,6 +267,11 @@ int evlist__expand_cgroup(struct evlist *evlist, const char *str)
> >               cgroup__put(cgrp);
> >               nr_cgroups++;
> >
> > +             perf_stat__collect_metric_expr(tmp_list);
> > +             if (metricgroup__copy_metric_events(tmp_list, cgrp, metric_events,
> > +                                                 &orig_metric_events) < 0)
> > +                     break;
> > +
> >               perf_evlist__splice_list_tail(evlist, &tmp_list->core.entries);
> >               tmp_list->core.nr_entries = 0;
> >
> > @@ -273,6 +285,7 @@ int evlist__expand_cgroup(struct evlist *evlist, const char *str)
> >  out_err:
> >       evlist__delete(orig_list);
> >       evlist__delete(tmp_list);
> > +     rblist__exit(&orig_metric_events);
> >
> >       return ret;
> >  }
> > diff --git a/tools/perf/util/cgroup.h b/tools/perf/util/cgroup.h
> > index 32893018296f..eea6df8ee373 100644
> > --- a/tools/perf/util/cgroup.h
> > +++ b/tools/perf/util/cgroup.h
> > @@ -22,9 +22,11 @@ struct cgroup *cgroup__get(struct cgroup *cgroup);
> >  void cgroup__put(struct cgroup *cgroup);
> >
> >  struct evlist;
> > +struct rblist;
> >
> >  struct cgroup *evlist__findnew_cgroup(struct evlist *evlist, const char *name);
> > -int evlist__expand_cgroup(struct evlist *evlist, const char *cgroups);
> > +int evlist__expand_cgroup(struct evlist *evlist, const char *cgroups,
> > +                       struct rblist *metric_events);
> >
> >  void evlist__set_default_cgroup(struct evlist *evlist, struct cgroup *cgroup);
> >
> > diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
> > index ee7b576d3b12..424209c4bcd2 100644
> > --- a/tools/perf/util/evlist.c
> > +++ b/tools/perf/util/evlist.c
> > @@ -1964,3 +1964,14 @@ int evlist__ctlfd_process(struct evlist *evlist, enum evlist_ctl_cmd *cmd)
> >
> >       return err;
> >  }
> > +
> > +struct evsel *evlist__get_evsel(struct evlist *evlist, int idx)
>
> perhaps evlist__find_evsel is better name?
> we have get/put names for functions changing refcount

Looks better, will change.

Thanks
Namhyung

>
> > +{
> > +     struct evsel *evsel;
> > +
> > +     evlist__for_each_entry(evlist, evsel) {
> > +             if (evsel->idx == idx)
> > +                     return evsel;
> > +     }
> > +     return NULL;
> > +}
>
> SNIP
>