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

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Date:   Tue, 22 Sep 2020 23:29:31 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Namhyung Kim <namhyung@...nel.org>
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 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 

jirka

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

SNIP