linux-kernel - Re: [PATCH 3/8] perf report: Add --percentage option

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Date:	Mon, 24 Feb 2014 15:37:14 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Namhyung Kim <namhyung.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH 3/8] perf report: Add --percentage option

Hi Jiri,

On Thu, 20 Feb 2014 11:39:50 +0100, Jiri Olsa wrote:
> On Mon, Feb 10, 2014 at 11:47:20AM +0900, Namhyung Kim wrote:
>> The --percentage option is for controlling overhead percentage
>> displayed.  It can only receive either of "relative" or "absolute".
>> 
>> "relative" means it's relative to filtered entries only so that the
>> sum of shown entries will be always 100%.  "absolute" means it retains
>> the original value before and after the filter is applied.
>
> SNIP
>
>> diff --git a/tools/perf/ui/hist.c b/tools/perf/ui/hist.c
>> index 78f4c92e9b73..714f3f00ea55 100644
>> --- a/tools/perf/ui/hist.c
>> +++ b/tools/perf/ui/hist.c
>> @@ -21,10 +21,13 @@ static int __hpp__fmt(struct perf_hpp *hpp, struct hist_entry *he,
>>  
>>  	if (fmt_percent) {
>>  		double percent = 0.0;
>> +		u64 total = hists->stats.total_period;
>>  
>> -		if (hists->stats.total_period)
>> -			percent = 100.0 * get_field(he) /
>> -				  hists->stats.total_period;
>> +		if (symbol_conf.filter_relative)
>> +			total = hists->stats.total_filtered_period;
>> +
>> +		if (total)
>> +			percent = 100.0 * get_field(he) / total;
>>  
>>  		ret = print_fn(hpp->buf, hpp->size, fmt, percent);
>>  	} else
>> @@ -41,6 +44,9 @@ static int __hpp__fmt(struct perf_hpp *hpp, struct hist_entry *he,
>>  			u64 period = get_field(pair);
>>  			u64 total = pair->hists->stats.total_period;
>>  
>> +			if (symbol_conf.filter_relative)
>> +				total = pair->hists->stats.total_filtered_period;
>> +
>>  			if (!total)
>>  				continue;
>
> looks like we could use something like:
>
> perf_hists__total_period(hists)
> {
> 	u64 total = hists->stats.total_period;
>
> 	if (symbol_conf.filter_relative)
> 		total = hists->stats.total_filtered_period;
>
> 	return total;
> }
>
> probably on other places as well

Right!  Will change.

Thanks,
Namhyung
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