[PATCH 1/6] perf tools: Don't report zero period samples for slave events

[Jiri Olsa <jolsa@kernel.org>]

There's no reason to deliver sample for zero period.
It means there was no value for slave event since its
last group leader sample.

Link: http://lkml.kernel.org/n/tip-d5he0papol5dhwvfq33ess1p@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
 tools/perf/util/session.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 18fb9c8cbf9c..c764bbc91009 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -1202,6 +1202,13 @@ static int deliver_sample_value(struct perf_evlist *evlist,
 		return 0;
 	}
 
+	/*
+	 * There's no reason to deliver sample
+	 * for zero period, bail out.
+	 */
+	if (!sample->period)
+		return 0;
+
 	return tool->sample(tool, event, sample, sid->evsel, machine);
 }
 
-- 
2.17.2