Re: [PATCH 2/2] perf stat: Also hide metric from JSON if units are an empty string
From: Namhyung Kim
Date: Tue Oct 29 2024 - 20:42:39 EST
Hello,
On Fri, Oct 25, 2024 at 10:03:05AM +0100, James Clark wrote:
> We decided to hide NULL metric units rather than showing it as "(null)",
> but on hybrid systems if the process doesn't hit a PMU you get an empty
> string metric unit instead. To make it consistent also remove empty
> strings.
>
> Note that metric-threshold is already hidden in this case without this
> change.
>
> Where a process only runs on cpu_core and never hits cpu_atom:
> Before:
> $ perf stat -j -- true
> ...
> {"counter-value" : "<not counted>", "unit" : "", "event" : "cpu_atom/branch-misses/", "event-runtime" : 0, "pcnt-running" : 0.00, "metric-value" : "0.000000", "metric-unit" : ""}
> {"counter-value" : "6326.000000", "unit" : "", "event" : "cpu_core/branch-misses/", "event-runtime" : 293786, "pcnt-running" : 100.00, "metric-value" : "3.553394", "metric-unit" : "of all branches", "metric-threshold" : "good"}
> ...
I guess you're talking about "metric-unit", not plain "unit", right?
Then please update the subject line to reduce the config.
Ian, can you please review?
Thanks,
Namhyung
>
> After:
> ...
> {"counter-value" : "<not counted>", "unit" : "", "event" : "cpu_atom/branch-misses/", "event-runtime" : 0, "pcnt-running" : 0.00}
> {"counter-value" : "5778.000000", "unit" : "", "event" : "cpu_core/branch-misses/", "event-runtime" : 282240, "pcnt-running" : 100.00, "metric-value" : "3.226797", "metric-unit" : "of all branches", "metric-threshold" : "good"}
> ...
>
> Signed-off-by: James Clark <james.clark@xxxxxxxxxx>
> ---
> tools/perf/util/stat-display.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/tools/perf/util/stat-display.c b/tools/perf/util/stat-display.c
> index a5d72f4a515c..9b7fd985a42a 100644
> --- a/tools/perf/util/stat-display.c
> +++ b/tools/perf/util/stat-display.c
> @@ -506,7 +506,7 @@ static void print_metric_json(struct perf_stat_config *config __maybe_unused,
> struct outstate *os = ctx;
> FILE *out = os->fh;
>
> - if (unit) {
> + if (unit && strlen(unit)) {
> json_out(os, "\"metric-value\" : \"%f\", \"metric-unit\" : \"%s\"", val, unit);
> if (thresh != METRIC_THRESHOLD_UNKNOWN) {
> json_out(os, "\"metric-threshold\" : \"%s\"",
> --
> 2.34.1
>