linux-kernel - Re: [PATCH v2 1/3] perf stat: refactor aggregation code

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Message-ID: <20130307213844.GB24191@krava.redhat.com>
Date:	Thu, 7 Mar 2013 22:38:44 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	linux-kernel@...r.kernel.org, peterz@...radead.org, mingo@...e.hu,
	ak@...ux.intel.com, acme@...hat.com, namhyung.kim@....com
Subject: Re: [PATCH v2 1/3] perf stat: refactor aggregation code

On Thu, Feb 14, 2013 at 01:57:27PM +0100, Stephane Eranian wrote:

SNIP

> -		if (aggr_socket)
> +		switch (aggr_mode) {
> +		case AGGR_SOCKET:
>  			fprintf(output, "#           time socket cpus             counts events\n");
> -		else if (no_aggr)
> +			break;
> +		case AGGR_NONE:
>  			fprintf(output, "#           time CPU                 counts events\n");
> -		else
> +			break;
> +		case AGGR_GLOBAL:
> +		default:
>  			fprintf(output, "#           time             counts events\n");
> +		}
>  	}
>  
>  	if (++num_print_interval == 25)
>  		num_print_interval = 0;
>  
> -	if (aggr_socket)
> -		print_aggr_socket(prefix);
> -	else if (no_aggr) {



this:

---
> +	switch (aggr_mode) {
> +	case AGGR_SOCKET:
> +		print_aggr(prefix);
> +		break;
> +	case AGGR_NONE:
>  		list_for_each_entry(counter, &evsel_list->entries, node)
>  			print_counter(counter, prefix);
> -	} else {
> +		break;
> +	case AGGR_GLOBAL:
> +	default:
>  		list_for_each_entry(counter, &evsel_list->entries, node)
>  			print_counter_aggr(counter, prefix);
>  	}
---



> @@ -356,12 +372,6 @@ static int __run_perf_stat(int argc __maybe_unused, const char **argv)
>  		ts.tv_nsec = 0;
>  	}

SNIP

> -	if (aggr_socket)
> -		print_aggr_socket(NULL);
> -	else if (no_aggr) {
> -		list_for_each_entry(counter, &evsel_list->entries, node)
> -			print_counter(counter, NULL);
> -	} else {


and this:
---
> +	switch (aggr_mode) {
> +	case AGGR_SOCKET:
> +		print_aggr(NULL);
> +		break;
> +	case AGGR_GLOBAL:
>  		list_for_each_entry(counter, &evsel_list->entries, node)
>  			print_counter_aggr(counter, NULL);
> +		break;
> +	case AGGR_NONE:
> +		list_for_each_entry(counter, &evsel_list->entries, node)
> +			print_counter(counter, NULL);
> +		break;
> +	default:
> +		break;
>  	}
---

could be in a single function with 'prefix' arg

Also in non interval mode no column headers are printed and the
output is sort of not user friendly, I think we could print the
header same as for the interval case.

[jolsa@...va perf]$ sudo ./perf stat -a --per-socket -e cycles /bin/true 

 Performance counter stats for '/bin/true':

S0        4          1,472,345 cycles                    #    0.000 GHz                    

^^^^^^^^^^^, versus:

[jolsa@...va perf]$ sudo ./perf stat -a --per-socket -I 100 -e cycles
sleep 10
#           time socket cpus             counts events
     0.100283713 S0        4         12,975,188 cycles                   
     0.200881622 S0        4         15,982,354 cycles                   

thanks,
jirka
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