linux-kernel - Re: [PATCH 1/5] perf tools: Count filtered entries to total period also

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Date:	Mon, 27 Jan 2014 14:35:24 +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 1/5] perf tools: Count filtered entries to total period also

Hi,

On Thu, 23 Jan 2014 14:38:48 +0100, Jiri Olsa wrote:
> On Thu, Jan 23, 2014 at 08:28:49AM +0900, Namhyung Kim wrote:
>> Currently if a sample was filtered by command line option, it just
>> dropped.  But this affects final output in that the percentage can be
>> different since the filtered entries were not included to the total.
>> 
>> But user might want to see the original percentages when filter
>> applied so change the behavior depends on a new symbol_conf.filter_
>> relative value in order to be controlled by user later.
>
> SNIP
>
>> +		al->filtered |= (1 << HIST_FILTER__SYMBOL);
>>  
>> -out_filtered:
>> -	al->filtered = true;
>>  	return 0;
>>  }
>> diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
>> index e4e6249b87d4..73b999448932 100644
>> --- a/tools/perf/util/hist.c
>> +++ b/tools/perf/util/hist.c
>> @@ -13,13 +13,6 @@ static bool hists__filter_entry_by_thread(struct hists *hists,
>>  static bool hists__filter_entry_by_symbol(struct hists *hists,
>>  					  struct hist_entry *he);
>>  
>> -enum hist_filter {
>> -	HIST_FILTER__DSO,
>> -	HIST_FILTER__THREAD,
>> -	HIST_FILTER__PARENT,
>> -	HIST_FILTER__SYMBOL,
>> -};
>
> it striked me that al.filtered is duplicating he.filtered, so I thought
> we could leave just the one in hist_entry.. now I see annotate, diff
> and others use al.filtered to skip hist_entry adding/processing
>
> I think there's use for relative/total switch in other places,
> and we could actually get rid of the al.filtered and make
> the relative switch global (also in config?) .. in the future ;-)

Okay, as I wrote in the series description, it only changed perf report
part.  I'll make the necessary change to other parts in the next version.

>
>> -
>>  struct callchain_param	callchain_param = {
>>  	.mode	= CHAIN_GRAPH_REL,
>>  	.min_percent = 0.5,
>> @@ -329,8 +322,9 @@ void hists__inc_nr_entries(struct hists *hists, struct hist_entry *h)
>>  	if (!h->filtered) {
>>  		hists__calc_col_len(hists, h);
>>  		++hists->nr_entries;
>> -		hists->stats.total_period += h->stat.period;
>>  	}
>> +	if (!h->filtered || !symbol_conf.filter_relative)
>> +		hists->stats.total_period += h->stat.period;
>
> also we could keep both counts and easily switch on in tui/gui
> .. in the future ;-)

Will do.

Thanks,
Namhyung
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