Re: [PATCH] perf: fix stat attach bogus counts

[Ingo Molnar <mingo@elte.hu>]

* Stephane Eranian <eranian@google.com> wrote:

> 	When perf stat -p pid is used, the events must be enabled
> 	immediately as there is no exec and thus no enable_on_exec.
> 
> 	Signed-off-by: Stephane Eranian <eranian@google.com>
> 
> --
>  builtin-stat.c |    6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
> index 95db31c..3a91fad 100644
> --- a/tools/perf/builtin-stat.c
> +++ b/tools/perf/builtin-stat.c
> @@ -159,8 +159,10 @@ static void create_perf_stat_counter(int counter, int pid)
>  		}
>  	} else {
>  		attr->inherit	     = inherit;
> -		attr->disabled	     = 1;
> -		attr->enable_on_exec = 1;
> +		if (target_pid == -1) {
> +			attr->disabled	     = 1;
> +			attr->enable_on_exec = 1;
> +		}

Mind checking latest -tip, which has these commits:

d6d901c: perf events: Change perf parameter --pid to process-wide collection instead of thread-wid
46be604: perf record: Enable counters only when kernel is execing subcommand
6be2850: perf stat: Enable counters when collecting process-wide or system-wide data

as they fix/improve various --pid related behavioral aspects of perf. Does it 
work fine for you now?

	Ingo