linux-kernel - Re: [PATCH] perf tools: fix set event list leader

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Date:	Thu, 31 Jan 2013 14:12:43 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	linux-kernel@...r.kernel.org, acme@...hat.com, mingo@...e.hu,
	peterz@...radead.org, namhyung.kim@....com
Subject: Re: [PATCH] perf tools: fix set event list leader

On Thu, Jan 31, 2013 at 01:54:37PM +0100, Stephane Eranian wrote:
> 
> The __perf_evlist__set_leader() was setting the leader for all events
> in the list except the first. Which means it assumed the first event
> already had event->leader = event. Seems like this should be the role
> of the function to also do this. This is a requirement for an upcoming
> patch set.

agreed, 

Acked/Tested-by Jiri Olsa <jolsa@...hat.com>


> 
> Signed-off-by: Stephane Eranian <eranian@...gle.com>
> ---
> 
> diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
> index dc8aee9..050d5bc 100644
> --- a/tools/perf/util/evlist.c
> +++ b/tools/perf/util/evlist.c
> @@ -119,8 +119,7 @@ void __perf_evlist__set_leader(struct list_head *list)
>  	leader = list_entry(list->next, struct perf_evsel, node);
>  
>  	list_for_each_entry(evsel, list, node) {
> -		if (evsel != leader)
> -			evsel->leader = leader;
> +		evsel->leader = leader;
>  	}

that's leftover from the times when leader has 'leader' set to NULL

we made the change here:

perf evsel: Set leader evsel's ->leader to itself
commit 2cfda562da7b0b1e0575507ef3efe782d4e218e4
Author: Namhyung Kim <namhyung.kim@....com>
Date:   Thu Nov 29 15:38:29 2012 +0900

the leader is set properly in perf_evsel__init and when
reading perf.data, so there was no harm in current code

thanks,
jirka
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