perf stat: Fix -nan% output in perf stat noise printouts (f99844cb) · Commits · 戴 / test

tools/perf/builtin-stat.c

+13 −5

Original line number	Diff line number	Diff line
		@@ -382,6 +382,16 @@ static int run_perf_stat(int argc __used, const char **argv)
		return WEXITSTATUS(status);
		}

		static void print_noise_pct(double total, double avg)
		{
		double pct = 0.0;

		if (avg)
		pct = 100.0*total/avg;

		fprintf(stderr, " ( +-%6.2f%% )", pct);
		}

		static void print_noise(struct perf_evsel *evsel, double avg)
		{
		struct perf_stat *ps;
		@@ -390,8 +400,7 @@ static void print_noise(struct perf_evsel *evsel, double avg)
		return;

		ps = evsel->priv;
		fprintf(stderr, " ( +- %7.3f%% )",
		100 * stddev_stats(&ps->res_stats[0]) / avg);
		print_noise_pct(stddev_stats(&ps->res_stats[0]), avg);
		}

		static void nsec_printout(int cpu, struct perf_evsel *evsel, double avg)
		@@ -635,8 +644,7 @@ static void print_stat(int argc, const char **argv)
		fprintf(stderr, " %18.9f seconds time elapsed",
		avg_stats(&walltime_nsecs_stats)/1e9);
		if (run_count > 1) {
		fprintf(stderr, " ( +-%5.2f%% )",
		100*stddev_stats(&walltime_nsecs_stats) /
		print_noise_pct(stddev_stats(&walltime_nsecs_stats),
		avg_stats(&walltime_nsecs_stats));
		}
		fprintf(stderr, "\n\n");