linux-kernel - Re: [RFC PATCH 2/2] tools/perf: Make group_fd static and move its place in __perf_evsel_

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Date:	Mon, 24 Oct 2011 12:03:28 -0200
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	Deng-Cheng Zhu <dczhu@...s.com>
Cc:	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>, Ingo Molnar <mingo@...e.hu>
Subject: Re: [RFC PATCH 2/2] tools/perf: Make group_fd static and move its
 place in __perf_evsel__open()

Em Mon, Oct 24, 2011 at 06:57:00PM +0800, Deng-Cheng Zhu escreveu:
> __perf_evsel__open() is called per event, it does not work for all the
> grouped events at one time. So, currently group_fd will alway be -1 for
> the events in a group. This patch fixes it.
> 
> Signed-off-by: Deng-Cheng Zhu <dczhu@...s.com>
> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Cc: Paul Mackerras <paulus@...ba.org>
> Cc: Ingo Molnar <mingo@...e.hu>
> Cc: Arnaldo Carvalho de Melo <acme@...stprotocols.net>
> ---
>  tools/perf/util/evsel.c |    3 +--
>  1 files changed, 1 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
> index e389815..7bd0d9d 100644
> --- a/tools/perf/util/evsel.c
> +++ b/tools/perf/util/evsel.c
> @@ -219,9 +219,8 @@ static int __perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
>  	}
>  
>  	for (cpu = 0; cpu < cpus->nr; cpu++) {
> -		int group_fd = -1;
> -
>  		for (thread = 0; thread < threads->nr; thread++) {
> +			static int group_fd = -1;
>  
>  			if (!evsel->cgrp)
>  				pid = threads->map[thread];

Lets not do it that way, using statics for this is humm, ugly, IMHO.

Just pass an integer pointer that is a member of perf_evlist, I'll work
on a patch now.

Thanks for reporting the bug tho! 

- Arnaldo
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