linux-kernel - Re: [PATCH 4/5] perf diff: Use internal rb tree for compute resort

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Date:	Fri, 07 Dec 2012 17:53:10 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Namhyung Kim <namhyung.kim@....com>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 4/5] perf diff: Use internal rb tree for compute resort

On Thu, 6 Dec 2012 17:51:36 +0100, Jiri Olsa wrote:
> On Fri, Dec 07, 2012 at 12:09:40AM +0900, Namhyung Kim wrote:
>> 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.
>
> I have another patch in queue ommiting dummy entries to display
> number in the compute column, so we don't have confusing 'sorted'
> outputs like:
>
> [jolsa@...va perf]$ ./perf diff -c+delta
> # Event 'cycles:u'
> #
> # Baseline    Delta  Shared Object                      Symbol
> # ........  .......  .............  ..........................
> #
>     17.92%  -17.92%  libc-2.15.so   [.] _IO_link_in           
>             +77.54%  libc-2.15.so   [.] __fprintf_chk         
>     15.64%  -15.64%  libc-2.15.so   [.] _dl_addr              
>      0.08%   +0.61%  ld-2.15.so     [.] _start                
>     12.16%  -12.16%  ld-2.15.so     [.] dl_main               
>     15.39%  -15.39%  ld-2.15.so     [.] _dl_check_map_versions
>     38.81%  -17.04%  [kernel.kallsyms]  [k] page_fault            
>
> just in case anyone actualy tries and wonders ;)

Sounds great!

>
> We need following change as well, because output resort does
> also col width recalc. Please add it if you respin, or I can
> send it later.

Okay, I'll resend a new version after getting a reply on the patch 2/5
from Arnaldo.  It'd be better if you send me a formal patch for this.

>
> other than that:
>
> Acked-by: Jiri Olsa <jolsa@...hat.com>

Thanks,
Namhyung

>
> ---
> diff --git a/tools/perf/builtin-diff.c b/tools/perf/builtin-diff.c
> index f66968e..6f56f78 100644
> --- a/tools/perf/builtin-diff.c
> +++ b/tools/perf/builtin-diff.c
> @@ -425,12 +425,15 @@ static void hists__compute_resort(struct hists *hists)
>  	hists->entries = RB_ROOT;
>  	next = rb_first(root);
>  
> +	hists__reset_col_len(hists);
> +
>  	while (next != NULL) {
>  		struct hist_entry *he;
>  
>  		he = rb_entry(next, struct hist_entry, rb_node_in);
>  		next = rb_next(&he->rb_node_in);
>  
> +		hists__calc_col_len(hists, he);
>  		insert_hist_entry_by_compute(&hists->entries, he, compute);
>  	}
>  }
--
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