linux-kernel - Re: [PATCH] perf stat: fix cvs output format

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Date:   Tue, 6 Mar 2018 08:58:46 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Cong Wang <xiyou.wangcong@...il.com>
Cc:     linux-kernel@...r.kernel.org, Andi Kleen <ak@...ux.intel.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Ilya Pronin <ipronin@...tter.com>
Subject: Re: [PATCH] perf stat: fix cvs output format

On Mon, Mar 05, 2018 at 10:43:53PM -0800, Cong Wang wrote:
> From: Ilya Pronin <ipronin@...tter.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@...ux.intel.com>
> Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
> Cc: Jiri Olsa <jolsa@...hat.com>
> Signed-off-by: Ilya Pronin <ipronin@...tter.com>
> Signed-off-by: Cong Wang <xiyou.wangcong@...il.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;
>  	}

right, the non else legs prints just 2 values:
  fprintf(out, "%s%s%s%s", csv_sep, vals, csv_sep, unit);

Acked-by: Jiri Olsa <jolsa@...nel.org>

thanks,
jirka