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Commit 11018201 authored by Anton Blanchard's avatar Anton Blanchard Committed by Ingo Molnar
Browse files

perf stat: Add branch performance metric 



When we count both branches and branch-misses it is useful to
print out the percentage of branch-misses:

 # perf stat -e branches -e branch-misses /bin/true

 Performance counter stats for '/bin/true':

         401684  branches                 #      0.000 M/sec
          23301  branch-misses            #      5.801 %

Signed-off-by: default avatarAnton Blanchard <anton@samba.org>
Cc: paulus@samba.org
Cc: a.p.zijlstra@chello.nl
LKML-Reference: <20091018112923.GQ4808@kryten>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent f39cdf25

tools/perf/builtin-stat.c

+11 −0
Original line number Diff line number Diff line
@@ -125,6 +125,7 @@ struct stats event_res_stats[MAX_COUNTERS][3]; 
struct stats			runtime_nsecs_stats;

struct stats			walltime_nsecs_stats;

struct stats			runtime_cycles_stats;

struct stats			runtime_branches_stats;



#define MATCH_EVENT(t, c, counter)			\

	(attrs[counter].type == PERF_TYPE_##t &&	\
@@ -235,6 +236,8 @@ static void read_counter(int counter) 
		update_stats(&runtime_nsecs_stats, count[0]);

	if (MATCH_EVENT(HARDWARE, HW_CPU_CYCLES, counter))

		update_stats(&runtime_cycles_stats, count[0]);

	if (MATCH_EVENT(HARDWARE, HW_BRANCH_INSTRUCTIONS, counter))

		update_stats(&runtime_branches_stats, count[0]);

}



static int run_perf_stat(int argc __used, const char **argv)
@@ -352,6 +355,14 @@ static void abs_printout(int counter, double avg) 
			ratio = avg / total;



		fprintf(stderr, " # %10.3f IPC  ", ratio);

	} else if (MATCH_EVENT(HARDWARE, HW_BRANCH_MISSES, counter)) {

		total = avg_stats(&runtime_branches_stats);



		if (total)

			ratio = avg * 100 / total;



		fprintf(stderr, " # %10.3f %%  ", ratio);



	} else {

		total = avg_stats(&runtime_nsecs_stats);