[tip:perf/urgent] perf stat: Fix zero total printouts

[tip-bot for Ingo Molnar]

Commit-ID:  c7f7fea30b7e52c9d4b9cef271110a98d59adcbc
Gitweb:     http://git.kernel.org/tip/c7f7fea30b7e52c9d4b9cef271110a98d59adcbc
Author:     Ingo Molnar <mingo@xxxxxxx>
AuthorDate: Tue, 22 Sep 2009 14:53:51 +0200
Committer:  Ingo Molnar <mingo@xxxxxxx>
CommitDate: Tue, 22 Sep 2009 15:01:47 +0200

perf stat: Fix zero total printouts

Before:

           0  sched:sched_switch #        nan M/sec

After:

           0  sched:sched_switch #      0.000 M/sec

Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Mike Galbraith <efault@xxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>


---
 tools/perf/builtin-stat.c |   18 ++++++++++++++----
 1 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 16af2d8..e5f6ece 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -338,14 +338,24 @@ static void nsec_printout(int counter, double avg)
 
 static void abs_printout(int counter, double avg)
 {
+	double total, ratio = 0.0;
+
 	fprintf(stderr, " %14.0f  %-24s", avg, event_name(counter));
 
 	if (MATCH_EVENT(HARDWARE, HW_INSTRUCTIONS, counter)) {
-		fprintf(stderr, " # %10.3f IPC  ",
-				avg / avg_stats(&runtime_cycles_stats));
+		total = avg_stats(&runtime_cycles_stats);
+
+		if (total)
+			ratio = avg / total;
+
+		fprintf(stderr, " # %10.3f IPC  ", ratio);
 	} else {
-		fprintf(stderr, " # %10.3f M/sec",
-				1000.0 * avg / avg_stats(&runtime_nsecs_stats));
+		total = avg_stats(&runtime_nsecs_stats);
+
+		if (total)
+			ratio = 1000.0 * avg / total;
+
+		fprintf(stderr, " # %10.3f M/sec", ratio);
 	}
 }
 
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