Re: [PATCH] perf stat: Set child_pid after perf_evlist__prepare_workload()

[David Ahern <dsahern@gmail.com>]

On 9/30/13 3:01 AM, Namhyung Kim wrote:
> From: Namhyung Kim <namhyung.kim@lge.com>
>
> The commit acf2892270dc ("perf stat: Use perf_evlist__prepare/
> start_workload()") converted to use the function but forgot to update
> child_pid.  Fix it.
>
> Cc: David Ahern <dsahern@gmail.com>
> Cc: Stephane Eranian <eranian@google.com>
> Signed-off-by: Namhyung Kim <namhyung@kernel.org>
> ---
>   tools/perf/builtin-stat.c | 1 +
>   1 file changed, 1 insertion(+)
>
> diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
> index f686d5ff594e..5098f144b92d 100644
> --- a/tools/perf/builtin-stat.c
> +++ b/tools/perf/builtin-stat.c
> @@ -457,6 +457,7 @@ static int __run_perf_stat(int argc, const char **argv)
>   			perror("failed to prepare workload");
>   			return -1;
>   		}
> +		child_pid = evsel_list->workload.pid;
>   	}
>
>   	if (group)
>

Interesting. I can't find a test case where is matters ... perhaps a 
convenience of waitpid taking -1.

David