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 <irogers@google.com>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Andrii Nakryiko <andriin@fb.com>
Cc: Cong Wang <xiyou.wangcong@gmail.com>
Cc: Jin Yao <yao.jin@linux.intel.com>
Cc: John Garry <john.garry@huawei.com>
Cc: Kajol Jain <kjain@linux.ibm.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Kim Phillips <kim.phillips@amd.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Clarke <pc@us.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Song Liu <songliubraving@fb.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: bpf@vger.kernel.org
Cc: netdev@vger.kernel.org
Link: http://lore.kernel.org/lkml/20200520182011.32236-8-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c
index 8f8f527..9e21aa7 100644 (file)
--- 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)