[PATCH] perf: stat: add noise output for csv mode

[Zhengyu He]

Previously, when you want perf-stat to output the statistics in csv
mode, no information of the noise will be printed out.

For example,

./perf stat -r3 -x, sleep 1
1.164789,task-clock
8,context-switches
0,CPU-migrations
219,page-faults
3337800,cycles

With this patch, the output will be appended with an additional entry of
the noise value:

./perf stat -r3 -x, sleep 1
1.164789,task-clock,3.75%
8,context-switches,75.00%
0,CPU-migrations,100.00%
219,page-faults,0.00%
3337800,cycles,3.36%

Signed-off-by: Zhengyu He <zhengyuh@xxxxxxxxxx>
---
 tools/perf/builtin-stat.c |    9 ++++++---
 1 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index a9f0671..3ca1caa 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -513,7 +513,10 @@ static void print_noise_pct(double total, double avg)
 	if (avg)
 		pct = 100.0*total/avg;
 
-	fprintf(stderr, "  ( +-%6.2f%% )", pct);
+        if (csv_output)
+	        fprintf(stderr, "%s%.2f%%", csv_sep, pct);
+        else
+	        fprintf(stderr, "  ( +-%6.2f%% )", pct);
 }
 
 static void print_noise(struct perf_evsel *evsel, double avg)
@@ -878,13 +881,13 @@ static void print_counter_aggr(struct perf_evsel *counter)
 	else
 		abs_printout(-1, counter, avg);
 
+	print_noise(counter, avg);
+
 	if (csv_output) {
 		fputc('\n', stderr);
 		return;
 	}
 
-	print_noise(counter, avg);
-
 	if (scaled) {
 		double avg_enabled, avg_running;
 
-- 
1.7.3.1

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