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perf session: Don't report zero period samples for slave events

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

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20190220122800.864-2-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jiri Olsa 2019-02-20 13:27:55 +01:00 • committed by Arnaldo Carvalho de Melo
parent ff7a4f98d5
commit 529c1a9e18
1 changed files with 7 additions and 0 deletions
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7
tools/perf/util/session.c
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@ -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);
}