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@@ -382,6 +382,16 @@ static int run_perf_stat(int argc __used, const char **argv)
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return WEXITSTATUS(status);
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}
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+static void print_noise_pct(double total, double avg)
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+{
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+ double pct = 0.0;
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+
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+ if (avg)
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+ pct = 100.0*total/avg;
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+
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+ fprintf(stderr, " ( +-%6.2f%% )", pct);
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+}
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+
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static void print_noise(struct perf_evsel *evsel, double avg)
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{
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struct perf_stat *ps;
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@@ -390,8 +400,7 @@ static void print_noise(struct perf_evsel *evsel, double avg)
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return;
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ps = evsel->priv;
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- fprintf(stderr, " ( +- %7.3f%% )",
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- 100 * stddev_stats(&ps->res_stats[0]) / avg);
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+ print_noise_pct(stddev_stats(&ps->res_stats[0]), avg);
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}
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static void nsec_printout(int cpu, struct perf_evsel *evsel, double avg)
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@@ -635,9 +644,8 @@ static void print_stat(int argc, const char **argv)
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fprintf(stderr, " %18.9f seconds time elapsed",
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avg_stats(&walltime_nsecs_stats)/1e9);
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if (run_count > 1) {
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- fprintf(stderr, " ( +-%5.2f%% )",
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- 100*stddev_stats(&walltime_nsecs_stats) /
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- avg_stats(&walltime_nsecs_stats));
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+ print_noise_pct(stddev_stats(&walltime_nsecs_stats),
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+ avg_stats(&walltime_nsecs_stats));
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}
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fprintf(stderr, "\n\n");
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}
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