linux-kernel - [PATCH 1/2] perf stat: Adjust print unit

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Date:	Mon,  6 Feb 2012 16:44:44 +0900
From:	Namhyung Kim <namhyung.kim@....com>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	Namhyung Kim <namhyung@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] perf stat: Adjust print unit

The default 'M/sec' unit is not useful if the result is small enough.
Adjust it dynamically according to the value.

Signed-off-by: Namhyung Kim <namhyung.kim@....com>
---
 tools/perf/builtin-stat.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 459b8620a5d9..32d930eb754e 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -844,12 +844,18 @@ static void abs_printout(int cpu, struct perf_evsel *evsel, double avg)
 
 		fprintf(output, " # %8.3f GHz                    ", ratio);
 	} else if (runtime_nsecs_stats[cpu].n != 0) {
+		char unit = 'M';
+
 		total = avg_stats(&runtime_nsecs_stats[cpu]);
 
 		if (total)
 			ratio = 1000.0 * avg / total;
+		if (ratio < 0.001) {
+			ratio *= 1000;
+			unit = 'K';
+		}
 
-		fprintf(output, " # %8.3f M/sec                  ", ratio);
+		fprintf(output, " # %8.3f %c/sec                  ", ratio, unit);
 	} else {
 		fprintf(output, "                                   ");
 	}
-- 
1.7.9

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