perf metricgroup: Remove unnecessary ',' from events

Remove unnecessary commas from events before they are parsed. This
avoids ',' being echoed by parse-events.l.

Signed-off-by: Ian Rogers <[email protected]>
Acked-by: Jiri Olsa <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Andrii Nakryiko <[email protected]>
Cc: Cong Wang <[email protected]>
Cc: Jin Yao <[email protected]>
Cc: John Garry <[email protected]>
Cc: Kajol Jain <[email protected]>
Cc: Kan Liang <[email protected]>
Cc: Kim Phillips <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Paul Clarke <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Song Liu <[email protected]>
Cc: Srikar Dronamraju <[email protected]>
Cc: Stephane Eranian <[email protected]>
Cc: Vince Weaver <[email protected]>
Cc: [email protected]
Cc: [email protected]
Link: http://lore.kernel.org/lkml/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

1 files changed, 7 insertions, 2 deletions

diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c
index 8f8f527eb75f..9e21aa767e41 100644
--- a/tools/perf/util/metricgroup.c
+++ b/tools/perf/util/metricgroup.c
@@ -504,9 +504,14 @@ static void metricgroup__add_metric_non_group(struct strbuf *events,
 {
 	struct hashmap_entry *cur;
 	size_t bkt;
+	bool first = true;
 
-	hashmap__for_each_entry((&ctx->ids), cur, bkt)
-		strbuf_addf(events, ",%s", (const char *)cur->key);
+	hashmap__for_each_entry((&ctx->ids), cur, bkt) {
+		if (!first)
+			strbuf_addf(events, ",");
+		strbuf_addf(events, "%s", (const char *)cur->key);
+		first = false;
+	}
 }
 
 static void metricgroup___watchdog_constraint_hint(const char *name, bool foot)