linux-kernel - Re: [PATCH v2] perf tools: Support -x for perf stat report

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Message-ID: <20201031095333.GA3345514@krava>
Date:   Sat, 31 Oct 2020 10:53:33 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Andi Kleen <andi@...stfloor.org>
Cc:     acme@...nel.org, jolsa@...nel.org, linux-kernel@...r.kernel.org,
        Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH v2] perf tools: Support -x for perf stat report

On Tue, Oct 27, 2020 at 10:15:10PM -0700, Andi Kleen wrote:
> Add support for the -x, option to enable CSV output with perf stat
> report. Useful to parse the information with other programs.
> 
> % perf stat record --quiet -a -I 1000 sleep 5
> % perf stat report -x,
>      1.000838672,4003.55,msec,cpu-clock,4003548736,100.00,,
>      1.000838672,11243,,context-switches,4003631885,100.00,0.003,M/sec
>      1.000838672,1682,,cpu-migrations,4003672150,100.00,0.420,K/sec
>      1.000838672,13244,,page-faults,4003697471,100.00,0.003,M/sec
>      1.000838672,2953214077,,cycles,4003715495,100.00,0.738,GHz
>      1.000838672,4380820799,,instructions,4003738270,100.00,1.48,insn per cycle
>      1.000838672,809865653,,branches,4003760616,100.00,202.287,M/sec
>      1.000838672,12439843,,branch-misses,4003780785,100.00,1.54,of all branches
> ...
> 
> Signed-off-by: Andi Kleen <ak@...ux.intel.com>
> 
> ---
> 
> v2: Fix default output (Jiri). Also handle \t as special value like the
> original parser (Andi)
> ---
>  tools/perf/builtin-stat.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
> index 743fe47e7a88..2f7eb6b68344 100644
> --- a/tools/perf/builtin-stat.c
> +++ b/tools/perf/builtin-stat.c
> @@ -1988,6 +1988,8 @@ static int __cmd_report(int argc, const char **argv)
>  		     "aggregate counts per numa node", AGGR_NODE),
>  	OPT_SET_UINT('A', "no-aggr", &perf_stat.aggr_mode,
>  		     "disable CPU count aggregation", AGGR_NONE),
> +	OPT_STRING('x', "field-separator", &stat_config.csv_sep, "separator",
> +		   "print counts with custom separator"),
>  	OPT_END()
>  	};
>  	struct stat st;
> @@ -2002,6 +2004,13 @@ static int __cmd_report(int argc, const char **argv)
>  			input_name = "perf.data";
>  	}
>  
> +	if (strcmp(stat_config.csv_sep, " ")) {

please use the DEFAULT_SEPARATOR instad of " "

thanks,
jirka

> +		stat_config.csv_output = true;
> +		if (!strcmp(stat_config.csv_sep, "\\t"))
> +			stat_config.csv_sep = "\t";
> +		stat_config.big_num = false;
> +	}
> +
>  	perf_stat.data.path = input_name;
>  	perf_stat.data.mode = PERF_DATA_MODE_READ;
>  
> -- 
> 2.28.0
>