linux-kernel - Re: [PATCH 4/4] perf test: Add expand cgroup event test

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Message-ID: <20200918135120.GD2626435@krava>
Date:   Fri, 18 Sep 2020 15:51:20 +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>,
        Stephane Eranian <eranian@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Ian Rogers <irogers@...gle.com>,
        John Garry <john.garry@...wei.com>
Subject: Re: [PATCH 4/4] perf test: Add expand cgroup event test

On Wed, Sep 16, 2020 at 03:31:29PM +0900, Namhyung Kim wrote:

SNIP

> +++ b/tools/perf/tests/tests.h
> @@ -123,6 +123,7 @@ const char *test__pfm_subtest_get_desc(int subtest);
>  int test__pfm_subtest_get_nr(void);
>  int test__parse_metric(struct test *test, int subtest);
>  int test__pe_file_parsing(struct test *test, int subtest);
> +int test__expand_cgroup_events(struct test *test, int subtest);
>  
>  bool test__bp_signal_is_supported(void);
>  bool test__bp_account_is_supported(void);
> diff --git a/tools/perf/util/cgroup.c b/tools/perf/util/cgroup.c
> index a1bf345a770b..eeffa08251b5 100644
> --- a/tools/perf/util/cgroup.c
> +++ b/tools/perf/util/cgroup.c
> @@ -52,7 +52,7 @@ static struct cgroup *evlist__find_cgroup(struct evlist *evlist, const char *str
>  	return NULL;
>  }


could you please put the do_open change below into separate patch?

thanks,
jirka

>  
> -static struct cgroup *cgroup__new(const char *name)
> +static struct cgroup *cgroup__new(const char *name, bool do_open)
>  {
>  	struct cgroup *cgroup = zalloc(sizeof(*cgroup));
>  
> @@ -62,9 +62,14 @@ static struct cgroup *cgroup__new(const char *name)
>  		cgroup->name = strdup(name);
>  		if (!cgroup->name)
>  			goto out_err;
> -		cgroup->fd = open_cgroup(name);
> -		if (cgroup->fd == -1)
> -			goto out_free_name;
> +
> +		if (do_open) {
> +			cgroup->fd = open_cgroup(name);
> +			if (cgroup->fd == -1)
> +				goto out_free_name;
> +		} else {
> +			cgroup->fd = -1;
> +		}
>  	}
>  
>  	return cgroup;
> @@ -80,7 +85,7 @@ struct cgroup *evlist__findnew_cgroup(struct evlist *evlist, const char *name)
>  {
>  	struct cgroup *cgroup = evlist__find_cgroup(evlist, name);
>  
> -	return cgroup ?: cgroup__new(name);
> +	return cgroup ?: cgroup__new(name, true);
>  }
>  
>  static int add_cgroup(struct evlist *evlist, const char *str)
> @@ -202,7 +207,7 @@ int parse_cgroups(const struct option *opt, const char *str,
>  }
>  
>  int evlist__expand_cgroup(struct evlist *evlist, const char *str,
> -			  struct rblist *metric_events)
> +			  struct rblist *metric_events, bool open_cgroup)
>  {
>  	struct evlist *orig_list, *tmp_list;
>  	struct evsel *pos, *evsel, *leader;
> @@ -240,7 +245,7 @@ int evlist__expand_cgroup(struct evlist *evlist, const char *str,
>  			if (!name)
>  				break;
>  
> -			cgrp = cgroup__new(name);
> +			cgrp = cgroup__new(name, open_cgroup);
>  			free(name);
>  			if (cgrp == NULL)
>  				break;
> diff --git a/tools/perf/util/cgroup.h b/tools/perf/util/cgroup.h
> index eea6df8ee373..162906f3412a 100644
> --- a/tools/perf/util/cgroup.h
> +++ b/tools/perf/util/cgroup.h
> @@ -26,7 +26,7 @@ struct rblist;
>  
>  struct cgroup *evlist__findnew_cgroup(struct evlist *evlist, const char *name);
>  int evlist__expand_cgroup(struct evlist *evlist, const char *cgroups,
> -			  struct rblist *metric_events);
> +			  struct rblist *metric_events, bool open_cgroup);
>  
>  void evlist__set_default_cgroup(struct evlist *evlist, struct cgroup *cgroup);
>  
> -- 
> 2.28.0.618.gf4bc123cb7-goog
>