linux-kernel - Re: [PATCH 1/9] perf, tools, stat: Abstract stat metrics printing

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Message-ID: <20160122100552.GC11995@krava.brq.redhat.com>
Date:	Fri, 22 Jan 2016 11:05:52 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	acme@...nel.org, jolsa@...nel.org, mingo@...nel.org,
	linux-kernel@...r.kernel.org, eranian@...gle.com,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 1/9] perf, tools, stat: Abstract stat metrics printing

On Tue, Jan 19, 2016 at 06:26:44PM -0800, Andi Kleen wrote:

SNIP

>  
> -void perf_stat__print_shadow_stats(FILE *out, struct perf_evsel *evsel,
> -				   double avg, int cpu, enum aggr_mode aggr)
> +void perf_stat__print_shadow_stats(struct perf_evsel *evsel,
> +				   double avg, int cpu,
> +				   struct perf_stat_output_ctx *out)
>  {
> +	void *ctxp = out->ctx;
> +	print_metric_t print_metric = out->print_metric;
>  	double total, ratio = 0.0, total2;
>  	int ctx = evsel_context(evsel);
>  
> @@ -307,119 +302,145 @@ void perf_stat__print_shadow_stats(FILE *out, struct perf_evsel *evsel,
>  		total = avg_stats(&runtime_cycles_stats[ctx][cpu]);
>  		if (total) {
>  			ratio = avg / total;
> -			fprintf(out, " #   %5.2f  insns per cycle        ", ratio);
> +			print_metric(ctxp, NULL, "%7.2f ",
> +					"insn per cycle", ratio);
>  		} else {
> -			fprintf(out, "                                   ");
> +			print_metric(ctxp, NULL, NULL, "insn per cycle", 0);
>  		}
>  		total = avg_stats(&runtime_stalled_cycles_front_stats[ctx][cpu]);
>  		total = max(total, avg_stats(&runtime_stalled_cycles_back_stats[ctx][cpu]));
>  
> +		out->new_line(ctxp);
>  		if (total && avg) {
>  			ratio = total / avg;
> -			fprintf(out, "\n");
> -			if (aggr == AGGR_NONE)
> -				fprintf(out, "        ");
> -			fprintf(out, "                                                  #   %5.2f  stalled cycles per insn", ratio);
> +			print_metric(ctxp, NULL, "%7.2f ",
> +					"stalled cycles per insn",
> +					ratio);
> +		} else {
> +			print_metric(ctxp, NULL, NULL,
> +				     "stalled cycles per insn", 0);
>  		}


hum the CSV output showing extra line with empty metrics,
and looks like t's because of the above hunk..

[jolsa@...va perf]$ sudo ./perf stat -e cycles,instructions -a -x, 
^C160517940,,cycles,2357448795,100.00,,Ghz,2357448795,100.00
84822675,,instructions,2357537479,100.00,0.53,insn per cycle
,,,2357537479,100.00,,stalled cycles per insn,2357537479,100.00

[jolsa@...va perf]$ sudo ./perf stat -e cycles,instructions -a 
^C
 Performance counter stats for 'system wide':

       114,951,298      cycles                                                      
        24,554,494      instructions              #    0.21  insn per cycle                                            

       0.663756378 seconds time elapsed


thanks,
jirka