Re: [PATCH v3] perf record: add dummy event during system wide synthesis

[Jiri Olsa]

On Wed, Apr 22, 2020 at 10:36:15AM -0700, Ian Rogers wrote:
> During the processing of /proc during event synthesis new processes may
> start. Add a dummy event if /proc is to be processed, to capture mmaps
> for starting processes. This reuses the existing logic for
> initial-delay.
> 
> v3 fixes the attr test of test-record-C0

SNIP

> +config2=0
> +branch_sample_type=0
> +sample_regs_user=0
> +sample_stack_user=0
> diff --git a/tools/perf/tests/attr/test-record-C0 b/tools/perf/tests/attr/test-record-C0
> index 93818054ae20..317730b906dd 100644
> --- a/tools/perf/tests/attr/test-record-C0
> +++ b/tools/perf/tests/attr/test-record-C0
> @@ -9,6 +9,14 @@ cpu=0
>  # no enable on exec for CPU attached
>  enable_on_exec=0
>  
> -# PERF_SAMPLE_IP | PERF_SAMPLE_TID PERF_SAMPLE_TIME | # PERF_SAMPLE_PERIOD
> +# PERF_SAMPLE_IP | PERF_SAMPLE_TID | PERF_SAMPLE_TIME |
> +# PERF_SAMPLE_ID | PERF_SAMPLE_PERIOD
>  # + PERF_SAMPLE_CPU added by -C 0
> -sample_type=391
> +sample_type=455

aah, so because now there's 2 events now, so PERF_SAMPLE_ID was added

Acked-by: Jiri Olsa <jolsa@xxxxxxxxxx>

thanks,
jirka