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Subject[tip:perf/urgent] perf stat: Fix CVS output format for non-supported counters
Commit-ID:  40c21898ba5372c14ef71717040529794a91ccc2
Author: Ilya Pronin <>
AuthorDate: Mon, 5 Mar 2018 22:43:53 -0800
Committer: Arnaldo Carvalho de Melo <>
CommitDate: Tue, 6 Mar 2018 10:53:52 -0300

perf stat: Fix CVS output format for non-supported counters

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

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

Which causes a failure when parsing fields. The numbers of separators
should be the same for each line, no matter if the counter is or not

Signed-off-by: Ilya Pronin <>
Acked-by: Jiri Olsa <>
Cc: Andi Kleen <>
Fixes: 92a61f6412d3 ("perf stat: Implement CSV metrics output")
Signed-off-by: Cong Wang <>
Signed-off-by: Arnaldo Carvalho de Melo <>
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);
snprintf(buf, sizeof(buf), fmt, val);
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