linux-kernel - [tip:perf/core] perf stat: Add noise output for csv mode

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Message-ID: <tip-3ae9a34d747f9abf2bcc85dc0e77b951513ccdf2@git.kernel.org>
Date:	Fri, 1 Jul 2011 15:26:01 GMT
From:	tip-bot for Zhengyu He <zhengyuh@...gle.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, eranian@...gle.com, paulus@...ba.org,
	hpa@...or.com, mingo@...hat.com, a.p.zijlstra@...llo.nl,
	acme@...stprotocols.net, zhengyuh@...gle.com, fweisbec@...il.com,
	tglx@...utronix.de, mingo@...e.hu, venki@...gle.com
Subject: [tip:perf/core] perf stat: Add noise output for csv mode

Commit-ID:  3ae9a34d747f9abf2bcc85dc0e77b951513ccdf2
Gitweb:     http://git.kernel.org/tip/3ae9a34d747f9abf2bcc85dc0e77b951513ccdf2
Author:     Zhengyu He <zhengyuh@...gle.com>
AuthorDate: Thu, 23 Jun 2011 13:45:42 -0700
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Fri, 1 Jul 2011 12:52:40 +0200

perf stat: Add noise output for csv mode

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

For example right now we output this --repeat information:

 ./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 for 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@...gle.com>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc: Stephane Eranian <eranian@...gle.com>
Cc: Venkatesh Pallipadi <venki@...gle.com>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Link: http://lkml.kernel.org/r/1308861942-4945-1-git-send-email-zhengyuh@google.com
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 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 784ed6d..1d08c80 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -517,7 +517,10 @@ 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)
@@ -882,13 +885,13 @@ 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;
 
--
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