Avoid cases like:
```
$ perf stat -a -M topdownl1 -j -I 1000
...
{"interval" : 11.127757275, "counter-value" : "85715898.000000", "unit" : "", "event" : "IDQ.MITE_UOPS", "event-runtime" : 988376123, "pcnt-running" : 100.00, "metric-value" : "0.000000", "metric-unit" : "(null)"}
...
```
If there is no unit then drop the metric-value too as:
Suggested-by: Tim Chen <tim.c.chen@linux.intel.com>
Signed-off-by: Ian Rogers <irogers@google.com>
---
tools/perf/util/stat-display.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/tools/perf/util/stat-display.c b/tools/perf/util/stat-display.c
index e392ee5efb45..6bb048fefe9d 100644
--- a/tools/perf/util/stat-display.c
+++ b/tools/perf/util/stat-display.c
@@ -470,8 +470,8 @@ static void print_metric_json(struct perf_stat_config *config __maybe_unused,
struct outstate *os = ctx;
FILE *out = os->fh;
- fprintf(out, "\"metric-value\" : \"%f\", ", val);
- fprintf(out, "\"metric-unit\" : \"%s\"", unit);
+ if (unit)
+ fprintf(out, "\"metric-value\" : \"%f\", \"metric-unit\" : \"%s\"", val, unit);
if (!config->metric_only)
fprintf(out, "}");
}
--
2.47.0.rc1.288.g06298d1525-goog