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Commit 849abde9 authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar
Browse files

perf stat: Clean up statistics calculations a bit more 



Remove some, now useless, global storage.
Don't calculate the stddev when not needed.

Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 8a02631a

tools/perf/builtin-stat.c

+14 −17
Original line number Diff line number Diff line
@@ -74,7 +74,6 @@ static int null_run = 0; 


static int			fd[MAX_NR_CPUS][MAX_COUNTERS];



static u64			event_res[MAX_COUNTERS][3];

static int			event_scaled[MAX_COUNTERS];



struct stats
@@ -179,14 +178,12 @@ static inline int nsec_counter(int counter) 
 */

static void read_counter(int counter)

{

	u64 *count, single_count[3];

	u64 count[3], single_count[3];

	unsigned int cpu;

	size_t res, nv;

	int scaled;

	int i;



	count = event_res[counter];



	count[0] = count[1] = count[2] = 0;



	nv = scale ? 3 : 1;
@@ -318,13 +315,16 @@ static int run_perf_stat(int argc __used, const char **argv) 
	return WEXITSTATUS(status);

}



static void print_noise(double avg, double stddev)

static void print_noise(int counter, double avg)

{

	if (run_count > 1)

		fprintf(stderr, "   ( +- %7.3f%% )", 100*stddev / avg);

	if (run_count == 1)

		return;



	fprintf(stderr, "   ( +- %7.3f%% )",

			100 * stddev_stats(&event_res_stats[counter][0]) / avg);

}



static void nsec_printout(int counter, double avg, double stddev)

static void nsec_printout(int counter, double avg)

{

	double msecs = avg / 1e6;
@@ -334,10 +334,9 @@ static void nsec_printout(int counter, double avg, double stddev) 
		fprintf(stderr, " # %10.3f CPUs ",

				avg / avg_stats(&walltime_nsecs_stats));

	}

	print_noise(avg, stddev);

}



static void abs_printout(int counter, double avg, double stddev)

static void abs_printout(int counter, double avg)

{

	fprintf(stderr, " %14.0f  %-24s", avg, event_name(counter));
@@ -348,7 +347,6 @@ static void abs_printout(int counter, double avg, double stddev) 
		fprintf(stderr, " # %10.3f M/sec",

				1000.0 * avg / avg_stats(&runtime_nsecs_stats));

	}

	print_noise(avg, stddev);

}



/*
@@ -356,12 +354,9 @@ static void abs_printout(int counter, double avg, double stddev) 
 */

static void print_counter(int counter)

{

	double avg, stddev;

	double avg = avg_stats(&event_res_stats[counter][0]);

	int scaled = event_scaled[counter];



	avg    = avg_stats(&event_res_stats[counter][0]);

	stddev = stddev_stats(&event_res_stats[counter][0]);



	if (scaled == -1) {

		fprintf(stderr, " %14s  %-24s\n",

			"<not counted>", event_name(counter));
@@ -369,9 +364,11 @@ static void print_counter(int counter) 
	}



	if (nsec_counter(counter))

		nsec_printout(counter, avg, stddev);

		nsec_printout(counter, avg);

	else

		abs_printout(counter, avg, stddev);

		abs_printout(counter, avg);



	print_noise(counter, avg);



	if (scaled) {

		double avg_enabled, avg_running;