Re: [PATCH v1] perf test: Stat std output match 2 metrics for stalled-cycles-backend

[Namhyung Kim]

On Thu, Apr 02, 2026 at 03:04:06PM -0700, Ian Rogers wrote:
> Seen on ARM, the stalled-cycles-backend event can be given as the
> event for both backend_cycles_idle and stalled_cycles_per_instruction
> metrics. Make the metric match sufficiently generic to allow this.
> 
> Signed-off-by: Ian Rogers <irogers@xxxxxxxxxx>
> ---
>  tools/perf/tests/shell/stat+std_output.sh | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/perf/tests/shell/stat+std_output.sh b/tools/perf/tests/shell/stat+std_output.sh
> index 9c4b92ecf448..5a6bda436dd4 100755
> --- a/tools/perf/tests/shell/stat+std_output.sh
> +++ b/tools/perf/tests/shell/stat+std_output.sh
> @@ -11,9 +11,12 @@ set -e
>  
>  stat_output=$(mktemp /tmp/__perf_test.stat_output.std.XXXXX)
>  
> +# For event_name[i] expect to see event_metric[i]. 'stalled-cycles-backend' may
> +# match both 'backend_cycles_idle' and 'stalled_cycles_per_instruction', hence
> +# matching "_cycles_".
>  event_name=(cpu-clock task-clock context-switches cpu-migrations page-faults stalled-cycles-frontend stalled-cycles-backend cycles instructions branches branch-misses)
> -event_metric=("CPUs_utilized" "CPUs_utilized" "cs/sec" "migrations/sec" "faults/sec" "frontend_cycles_idle" "backend_cycles_idle" "GHz" "insn_per_cycle" "/sec" "branch_miss_rate")
> -skip_metric=("tma_" "TopdownL1")
> +event_metric=("CPUs_utilized" "CPUs_utilized" "cs/sec" "migrations/sec" "faults/sec" "frontend_cycles_idle" "_cycles_" "GHz" "insn_per_cycle" "/sec" "branch_miss_rate")

Is this used for partial string match?

Then I guess "frontend_cycles_idle" can be covered by "_cycles_" too?
Also as we have "/sec", can "cs/sec" and "migrations/sec" be removed?


> +skip_metric=("tma_" "TopdownL1" "percent of slots")

Why is "percent of slots" added as well?

Thanks,
Namhyung

>  
>  cleanup() {
>    rm -f "${stat_output}"
> -- 
> 2.53.0.1213.gd9a14994de-goog
>