linux-kernel - Re: [PATCH 1/3] perf hists: Exchange order of comparing items when collapsing hists

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Date:	Tue, 4 Dec 2012 10:44:05 -0300
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Namhyung Kim <namhyung.kim@....com>,
	Jiri Olsa <jolsa@...hat.com>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 1/3] perf hists: Exchange order of comparing items when
 collapsing hists

Em Tue, Dec 04, 2012 at 01:44:23PM +0900, Namhyung Kim escreveu:
> From: Namhyung Kim <namhyung.kim@....com>
> 
> When comparing entries for collapsing put the given entry first, and
> then the iterated entry.  This is not the case of hist_entry__cmp()
> when called if given sort keys don't require collapsing.  So change
> the order for the sake of consistency.  It will be required for
> matching and/or linking multiple hist entries.
> 
> Cc: Jiri Olsa <jolsa@...hat.com>
> Cc: Stephane Eranian <eranian@...gle.com>
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> ---
>  tools/perf/util/hist.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
> index 82df1b26f0d4..161c35e7ed0e 100644
> --- a/tools/perf/util/hist.c
> +++ b/tools/perf/util/hist.c
> @@ -433,7 +433,7 @@ static bool hists__collapse_insert_entry(struct hists *hists __maybe_unused,
>  		parent = *p;
>  		iter = rb_entry(parent, struct hist_entry, rb_node_in);
>  
> -		cmp = hist_entry__collapse(iter, he);
> +		cmp = hist_entry__collapse(he, iter);
>  
>  		if (!cmp) {
>  			he_stat__add_stat(&iter->stat, &he->stat);

What about this he_stat__add_stat call? Now the hist_entry__collapse
receives (he, iter)  while this right next function call receives (iter,
he).

- Arnaldo

> -- 
> 1.7.11.7
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