linux-kernel - Re: [PATCH 3/3] perf diff: Use internal rb tree for compute resort

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Date:	Tue, 4 Dec 2012 10:45:44 -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 3/3] perf diff: Use internal rb tree for compute resort

Em Tue, Dec 04, 2012 at 01:44:25PM +0900, Namhyung Kim escreveu:
> From: Namhyung Kim <namhyung.kim@....com>
> 
> There's no reason to run hists_compute_resort() using output tree.
> Convert it to use internal tree so that it can remove unnecessary
> _output_resort.  Also move position computation below the resort since
> it changes the output ordering.

Have you tested this with 'perf top'? With the highest frequency?

- Arnaldo
 
> Cc: Jiri Olsa <jolsa@...hat.com>
> Cc: Stephane Eranian <eranian@...gle.com>
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> ---
>  tools/perf/builtin-diff.c | 32 +++++++++++++++++++-------------
>  1 file changed, 19 insertions(+), 13 deletions(-)
> 
> diff --git a/tools/perf/builtin-diff.c b/tools/perf/builtin-diff.c
> index b52f5d8c4a6b..4e18cea7c845 100644
> --- a/tools/perf/builtin-diff.c
> +++ b/tools/perf/builtin-diff.c
> @@ -435,19 +435,25 @@ static void insert_hist_entry_by_compute(struct rb_root *root,
>  
>  static void hists__compute_resort(struct hists *hists)
>  {
> -	struct rb_root tmp = RB_ROOT;
> -	struct rb_node *next = rb_first(&hists->entries);
> +	struct rb_root *root;
> +	struct rb_node *next;
> +
> +	if (sort__need_collapse)
> +		root = &hists->entries_collapsed;
> +	else
> +		root = hists->entries_in;
> +
> +	hists->entries = RB_ROOT;
> +	next = rb_first(root);
>  
>  	while (next != NULL) {
> -		struct hist_entry *he = rb_entry(next, struct hist_entry, rb_node);
> +		struct hist_entry *he;
>  
> -		next = rb_next(&he->rb_node);
> +		he = rb_entry(next, struct hist_entry, rb_node_in);
> +		next = rb_next(&he->rb_node_in);
>  
> -		rb_erase(&he->rb_node, &hists->entries);
> -		insert_hist_entry_by_compute(&tmp, he, compute);
> +		insert_hist_entry_by_compute(&hists->entries, he, compute);
>  	}
> -
> -	hists->entries = tmp;
>  }
>  
>  static void hists__process(struct hists *old, struct hists *new)
> @@ -459,16 +465,16 @@ static void hists__process(struct hists *old, struct hists *new)
>  	else
>  		hists__link(new, old);
>  
> -	hists__output_resort(new);
> -
> -	if (show_displacement)
> -		hists__compute_position(new);
> -
>  	if (sort_compute) {
>  		hists__precompute(new);
>  		hists__compute_resort(new);
> +	} else {
> +		hists__output_resort(new);
>  	}
>  
> +	if (show_displacement)
> +		hists__compute_position(new);
> +
>  	hists__fprintf(new, true, 0, 0, stdout);
>  }
>  
> -- 
> 1.7.11.7
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