diff options
| -rw-r--r-- | tools/perf/builtin-stat.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c index a43c6805107..af0d65b4141 100644 --- a/tools/perf/builtin-stat.c +++ b/tools/perf/builtin-stat.c @@ -254,8 +254,13 @@ static double avg_stats(struct stats *stats) */ static double stddev_stats(struct stats *stats) { - double variance = stats->M2 / (stats->n - 1); - double variance_mean = variance / stats->n; + double variance, variance_mean; + + if (!stats->n) + return 0.0; + + variance = stats->M2 / (stats->n - 1); + variance_mean = variance / stats->n; return sqrt(variance_mean); } |