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

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Date:	Thu, 23 Jan 2014 14:38:48 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Namhyung Kim <namhyung@...nel.org>
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

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 ;-)

> -
>  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 ;-)

jirka
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