linux-kernel - Re: [PATCH 1/4] perf, tools: Output running time and run/enabled ratio in CSV mode

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Date:	Tue, 10 Mar 2015 16:15:18 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	acme@...nel.org, jolsa@...hat.com, linux-kernel@...r.kernel.org,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 1/4] perf, tools: Output running time and run/enabled
 ratio in CSV mode

Hi Andi,

On Sun, Mar 08, 2015 at 04:55:21PM -0700, Andi Kleen wrote:
> From: Andi Kleen <ak@...ux.intel.com>
> 
> The information how much a counter ran in perf stat can be quite
> interesting for other tools to judge how trustworthy a measurement is.
> 
> Currently it is only output in non CSV mode.
> 
> This patches make perf stat always output the running time and the
> enabled/running ratio in CSV mode.
> 
> This adds two new fields at the end for each line. I assume that existing
> tools ignore new fields at the end, so it's on by default.
> 
> Only CSV mode is affected, no difference otherwise.
> 
> v2: Add extra print_running function
> v3: Avoid printing nan
> Reviewed-by: Jiri Olsa <jolsa@...hat.com>
> Signed-off-by: Andi Kleen <ak@...ux.intel.com>
> ---
>  tools/perf/builtin-stat.c | 36 ++++++++++++++++++++++++------------
>  1 file changed, 24 insertions(+), 12 deletions(-)
> 
> diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
> index d28949d..5d0c6ea 100644
> --- a/tools/perf/builtin-stat.c
> +++ b/tools/perf/builtin-stat.c
> @@ -769,6 +769,16 @@ static int run_perf_stat(int argc, const char **argv)
>  	return ret;
>  }
>  
> +static void print_running(u64 run, u64 ena)
> +{
> +	if (csv_output)
> +		fprintf(output, "%s%" PRIu64 "%s%.2f",
> +					csv_sep,
> +					run,
> +					csv_sep,
> +					ena ? 100.0 * run / ena : 100.0);
> +}

Why not handle both cases here?

static void print_running(u64 run, u64 ena)
{
	if (csv_output)
		fprintf(output, ...);
	else if (run != ena)
		fprintf(output, ...);
}

Thanks,
Namhyung


> +
>  static void print_noise_pct(double total, double avg)
>  {
>  	double pct = rel_stddev_stats(total, avg);
> @@ -1252,6 +1262,7 @@ static void print_aggr(char *prefix)
>  					fprintf(output, "%s%s",
>  						csv_sep, counter->cgrp->name);
>  
> +				print_running(run, ena);
>  				fputc('\n', output);
>  				continue;
>  			}
> @@ -1268,6 +1279,8 @@ static void print_aggr(char *prefix)
>  				if (run != ena)
>  					fprintf(output, "  (%.2f%%)",
>  						100.0 * run / ena);
> +			} else {
> +				print_running(run, ena);
>  			}
>  			fputc('\n', output);
>  		}
> @@ -1284,6 +1297,10 @@ static void print_counter_aggr(struct perf_evsel *counter, char *prefix)
>  	double avg = avg_stats(&ps->res_stats[0]);
>  	int scaled = counter->counts->scaled;
>  	double uval;
> +	double avg_enabled, avg_running;
> +
> +	avg_enabled = avg_stats(&ps->res_stats[1]);
> +	avg_running = avg_stats(&ps->res_stats[2]);
>  
>  	if (prefix)
>  		fprintf(output, "%s", prefix);
> @@ -1303,6 +1320,7 @@ static void print_counter_aggr(struct perf_evsel *counter, char *prefix)
>  		if (counter->cgrp)
>  			fprintf(output, "%s%s", csv_sep, counter->cgrp->name);
>  
> +		print_running(avg_running, avg_enabled);
>  		fputc('\n', output);
>  		return;
>  	}
> @@ -1316,19 +1334,9 @@ static void print_counter_aggr(struct perf_evsel *counter, char *prefix)
>  
>  	print_noise(counter, avg);
>  
> -	if (csv_output) {
> -		fputc('\n', output);
> -		return;
> -	}
> -
> -	if (scaled) {
> -		double avg_enabled, avg_running;
> -
> -		avg_enabled = avg_stats(&ps->res_stats[1]);
> -		avg_running = avg_stats(&ps->res_stats[2]);
> -
> +	print_running(avg_running, avg_enabled);
> +	if (!csv_output)
>  		fprintf(output, " [%5.2f%%]", 100 * avg_running / avg_enabled);
> -	}
>  	fprintf(output, "\n");
>  }
>  
> @@ -1370,6 +1378,7 @@ static void print_counter(struct perf_evsel *counter, char *prefix)
>  				fprintf(output, "%s%s",
>  					csv_sep, counter->cgrp->name);
>  
> +			print_running(run, ena);
>  			fputc('\n', output);
>  			continue;
>  		}
> @@ -1387,7 +1396,10 @@ static void print_counter(struct perf_evsel *counter, char *prefix)
>  			if (run != ena)
>  				fprintf(output, "  (%.2f%%)",
>  					100.0 * run / ena);
> +		} else {
> +			print_running(run, ena);
>  		}
> +
>  		fputc('\n', output);
>  	}
>  }
> -- 
> 1.9.3
> 
> --
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