linux-kernel - Re: [PATCH 01/12] perf tools: Keep group information

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Date:	Tue, 13 Nov 2012 10:29:53 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Jiri Olsa <jolsa@...hat.com>,
	Stephane Eranian <eranian@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Namhyung Kim <namhyung.kim@....com>
Subject: Re: [PATCH 01/12] perf tools: Keep group information

On Mon, 12 Nov 2012 14:08:33 -0300, Arnaldo Carvalho de Melo wrote:
> Em Sat, Nov 10, 2012 at 01:43:23AM +0900, Namhyung Kim escreveu:
>> From: Namhyung Kim <namhyung.kim@....com>
>> 
>> Add a few of group-related field in struct perf_{evlist,evsel} so that
>> the group information in a evlist can be known easily.  It only counts
>> groups which have more than 1 members since leader-only groups are
>> treated as non-group events.
>
> We don't need to add a group_idx, we can get it using evsel->idx -
> evsel->leader->idx, interdiff of this patch to what I think is
> equivalent:

Looks good to me.  Just a comment below..

>
> diff -u b/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
> --- b/tools/perf/util/evlist.c
> +++ b/tools/perf/util/evlist.c
> @@ -111,18 +111,16 @@
>  void __perf_evlist__set_leader(struct list_head *list)
>  {
>  	struct perf_evsel *evsel, *leader;
> -	int count = 0;
>  
>  	leader = list_entry(list->next, struct perf_evsel, node);
> +	evsel = list_entry(list->prev, struct perf_evsel, node);
>  	leader->leader = NULL;
> +	leader->nr_members = evsel->idx - leader->idx + 1;

This will lead a off-by-one difference with my patches.  I chose to use
0 nr_members for leader-only group.  It was used for an additional
allocation of group stats but it seems that it's not needed anymore
with the hist_link change.

Thanks,
Namhyung
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