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

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Date:	Fri, 30 Nov 2012 10:52:15 -0300
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Namhyung Kim <namhyung@...nel.org>,
	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

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?

> > +		}								\
> > +										\
> > +		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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