[PATCH] perf stat: fix cvs output format

From: Cong Wang <xiyou.wangcong@gmail.com>
To: linux-kernel@vger.kernel.org
Cc: Cong Wang <xiyou.wangcong@gmail.com>,
	Andi Kleen <ak@linux.intel.com>,
	Arnaldo Carvalho de Melo <acme@redhat.com>,
	Jiri Olsa <jolsa@redhat.com>, Ilya Pronin <ipronin@twitter.com>
Subject: [PATCH] perf stat: fix cvs output format
Date: Mon,  5 Mar 2018 22:43:53 -0800	[thread overview]
Message-ID: <20180306064353.31930-1-xiyou.wangcong@gmail.com> (raw)

From: Ilya Pronin <ipronin@twitter.com>

When printing stats in CSV mode, perf stat appends extra CSV
separators when counter is not supported:

<not supported>,,L1-dcache-store-misses,mesos/bd442f34-2b4a-47df-b966-9b281f9f56fc,0,100.00,,,,

which causes a failure of parsing fields. The numbers of separators
is fixed for each line, no matter supported or not supported.

Fixes: 92a61f6412d3 ("perf stat: Implement CSV metrics output")
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Signed-off-by: Ilya Pronin <ipronin@twitter.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
---
 tools/perf/builtin-stat.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 98bf9d32f222..54a4c152edb3 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -917,7 +917,7 @@ static void print_metric_csv(void *ctx,
 	char buf[64], *vals, *ends;
 
 	if (unit == NULL || fmt == NULL) {
-		fprintf(out, "%s%s%s%s", csv_sep, csv_sep, csv_sep, csv_sep);
+		fprintf(out, "%s%s", csv_sep, csv_sep);
 		return;
 	}
 	snprintf(buf, sizeof(buf), fmt, val);
-- 
2.13.0
