linux-kernel - Re: [PATCH 5/7] perf, tools, stat: Implement --metric-only mode

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Date:	Wed, 2 Mar 2016 12:57:50 +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 5/7] perf, tools, stat: Implement --metric-only mode

On Tue, Mar 01, 2016 at 10:57:50AM -0800, Andi Kleen wrote:

SNIP

>  static void print_interval(char *prefix, struct timespec *ts)
>  {
>  	FILE *output = stat_config.output;
> @@ -1130,7 +1287,7 @@ static void print_interval(char *prefix, struct timespec *ts)
>  
>  	sprintf(prefix, "%6lu.%09lu%s", ts->tv_sec, ts->tv_nsec, csv_sep);
>  
> -	if (num_print_interval == 0 && !csv_output) {
> +	if (num_print_interval == 0 && !csv_output && !metric_only) {
>  		switch (stat_config.aggr_mode) {
>  		case AGGR_SOCKET:
>  			fprintf(output, "#           time socket cpus             counts %*s events\n", unit_width, "unit");
> @@ -1217,6 +1374,17 @@ static void print_counters(struct timespec *ts, int argc, const char **argv)
>  	else
>  		print_header(argc, argv);
>  
> +	if (metric_only) {
> +		static int num_print_iv;
> +
> +		if (num_print_iv == 0)
> +			print_metric_headers(prefix);
> +		if (num_print_iv++ == 25)
> +			num_print_iv = 0;
> +		if (stat_config.aggr_mode == AGGR_GLOBAL && prefix)
> +			fprintf(stat_config.output, "%s", prefix);
> +	}
> +
>  	switch (stat_config.aggr_mode) {
>  	case AGGR_CORE:
>  	case AGGR_SOCKET:
> @@ -1229,6 +1397,8 @@ static void print_counters(struct timespec *ts, int argc, const char **argv)
>  	case AGGR_GLOBAL:
>  		evlist__for_each(evsel_list, counter)
>  			print_counter_aggr(counter, prefix);
> +		if (metric_only)
> +			fputc('\n', stat_config.output);

this new line printing based on metric_only is all over the place..
could we sorted out new lines in the print callbacks?  this makes
my head hurt ;-)

also some comments would be great

thanks,
jirka