linux-kernel - Re: [PATCH 2/3] perf stat: Don't require a workload when using system wide or CPU options

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Date:	Mon, 30 Sep 2013 17:47:34 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	David Ahern <dsahern@...il.com>
Cc:	acme@...stprotocols.net, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...nel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Jiri Olsa <jolsa@...hat.com>,
	Namhyung Kim <namhyung.kim@....com>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 2/3] perf stat: Don't require a workload when using system wide or CPU options

Hi David,

On Sat, 28 Sep 2013 14:27:59 -0600, David Ahern wrote:
> perf-stat can do system wide counters or one or more cpus. For
> these options do not require a workload to be specified.
>
> Signed-off-by: David Ahern <dsahern@...il.com>
> Cc: Ingo Molnar <mingo@...nel.org>
> Cc: Frederic Weisbecker <fweisbec@...il.com>
> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Cc: Jiri Olsa <jolsa@...hat.com>
> Cc: Namhyung Kim <namhyung.kim@....com>
> Cc: Stephane Eranian <eranian@...gle.com>
> ---
>  tools/perf/builtin-stat.c |    4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
> index 6cc0aa2..60239fe 100644
> --- a/tools/perf/builtin-stat.c
> +++ b/tools/perf/builtin-stat.c
> @@ -1517,8 +1517,10 @@ int cmd_stat(int argc, const char **argv, const char *prefix __maybe_unused)
>  	} else if (big_num_opt == 0) /* User passed --no-big-num */
>  		big_num = false;
>  
> -	if (!argc && !perf_target__has_task(&target))
> +	if (!argc && !perf_target__has_task(&target) &&
> +	    !perf_target__has_cpu(&target))

You can use perf_target__none() for this.

Btw I found a bug in setting child_pid (which introduced by me ;) during
this review.  Will send a fix.

Thanks,
Namhyung


>  		usage_with_options(stat_usage, options);
> +
>  	if (run_count < 0) {
>  		usage_with_options(stat_usage, options);
>  	} else if (run_count == 0) {
--
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