linux-kernel - Re: [PATCH 04/20] perf tools: Support event grouping in hpp ->sort()

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Date:	Thu, 15 May 2014 13:43:15 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	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>,
	Don Zickus <dzickus@...hat.com>
Subject: Re: [PATCH 04/20] perf tools: Support event grouping in hpp ->sort()

On Mon, May 12, 2014 at 03:28:37PM +0900, Namhyung Kim wrote:

SNIP

> +static int __hpp__sort(struct hist_entry *a, struct hist_entry *b,
> +		       hpp_field_fn get_field)
> +{
> +	s64 ret;
> +	int i, nr_members;
> +	struct perf_evsel *evsel;
> +	struct hist_entry *pair;
> +	u64 *fields_a, *fields_b;
> +
> +	ret = field_cmp(get_field(a), get_field(b));
> +	if (ret || !symbol_conf.event_group)
> +		return ret;
> +
> +	evsel = hists_to_evsel(a->hists);
> +	if (!perf_evsel__is_group_event(evsel))
> +		return ret;
> +
> +	nr_members = evsel->nr_members;
> +	fields_a = calloc(sizeof(*fields_a), nr_members);
> +	fields_b = calloc(sizeof(*fields_b), nr_members);
> +
> +	if (!fields_a || !fields_b)
> +		goto out;
> +
> +	list_for_each_entry(pair, &a->pairs.head, pairs.node) {
> +		evsel = hists_to_evsel(pair->hists);
> +		fields_a[perf_evsel__group_idx(evsel)] = get_field(pair);
> +	}
> +
> +	list_for_each_entry(pair, &b->pairs.head, pairs.node) {
> +		evsel = hists_to_evsel(pair->hists);
> +		fields_b[perf_evsel__group_idx(evsel)] = get_field(pair);
> +	}
> +
> +	for (i = 1; i < nr_members; i++) {
> +		ret = fields_a[i] - fields_b[i];

should we call here ^^^call  field_cmp ?

jirka
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