linux-kernel - Re: [PATCH 12/18] perf ui/hist: Add support for event group view

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Message-ID: <87lidfykau.fsf@sejong.aot.lge.com>
Date:	Mon, 03 Dec 2012 10:51:53 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	Jiri Olsa <jolsa@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Stephane Eranian <eranian@...gle.com>,
	Andi Kleen <andi@...stfloor.org>,
	Namhyung Kim <namhyung.kim@....com>
Subject: Re: [PATCH 12/18] perf ui/hist: Add support for event group view

On Fri, 30 Nov 2012 10:52:15 -0300, Arnaldo Carvalho de Melo wrote:
> Em Fri, Nov 30, 2012 at 02:29:43PM +0100, Jiri Olsa escreveu:
>> On Thu, Nov 29, 2012 at 03:38:40PM +0900, Namhyung Kim wrote:
>> > +#define __HPP_COLOR_PERCENT_FN(_type, _field)					\
>> > +static int hpp__color_##_type(struct perf_hpp *hpp, struct hist_entry *he) 	\
>> > +{										\
>> > +	int ret;								\
>> > +	double percent = 0.0;							\
>> > +	struct hists *hists = he->hists;					\
>> > +										\
>> > +	if (hists->stats.total_period)						\
>> > +		percent = 100.0 * he->stat._field / hists->stats.total_period; 	\
>> > +										\
>> > +	ret = percent_color_snprintf(hpp->buf, hpp->size, " %6.2f%%", percent);	\
>> > +										\
>> > +	if (symbol_conf.event_group) {						\
>> > +		int i;								\
>> > +		struct perf_evsel *evsel = hists_to_evsel(hists);		\
>> > +		struct hist_entry *pair;					\
>> > +		int nr_members = evsel->nr_members;				\
>> > +		double *percents;						\
>> > +										\
>> > +		if (nr_members <= 1)						\
>> > +			return ret;						\
>> > +										\
>> > +		percents = zalloc(sizeof(*percents) * nr_members);		\
>> > +		if (percents == NULL) {						\
>> > +			pr_warning("Not enough memory!\n");			\
>> > +			return ret;						\
>> > +		}								\
>
> Why do we need to zalloc this percents array?
>
>> > +		list_for_each_entry(pair, &he->pairs.head, pairs.node) { 	\
>> > +			u64 period = pair->stat._field;				\
>> > +			u64 total = pair->hists->stats.total_period;		\
>> > +										\
>> > +			if (!total)						\
>> > +				continue;					\
>> > +										\
>> > +			evsel = hists_to_evsel(pair->hists);			\
>> > +			i = perf_evsel__group_idx(evsel);			\
>> > +			percents[i] = 100.0 * period / total;			\
>
> Why not use percent_color_snprintf here, using some "%*s" thing that
> uses i to position the output in the right column? This way the
> following loop can be ditched as well. No?

It's because it's possible that an entry didn't have pairs for every
group member.  Say, there's a group consists of 3 members (1 leader + 2
member).  It's quite legitimate that a leader hist entry has just one
pair for a member and miss another.  So I allocated a zero-filled array,
and filled what it has, and print them all in the for loop below.

Thanks,
Namhyung

>
>> > +		}								\
>> > +										\
>> > +		for (i = 1; i < nr_members; i++) {				\
>> > +			ret += percent_color_snprintf(hpp->buf + ret,		\
>> > +						      hpp->size - ret,		\
>> > +						      " %6.2f%%", percents[i]);	\
>> > +		}								\
>> > +		free(percents);							\
>> > +	}									\
>> > +	return ret;								\
>
> - Arnaldo
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