linux-kernel - Re: [PATCH] perf diff: Fix duplicated output column

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Date:	Tue, 10 May 2016 15:17:12 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Jiri Olsa <jolsa@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"stable # 4 . 5" <stable@...r.kernel.org>
Subject: Re: [PATCH] perf diff: Fix duplicated output column

On Tue, May 10, 2016 at 09:48:19PM +0900, Namhyung Kim wrote:
> The commit b97511c5bc94 ("perf tools: Add overhead/overhead_children
> keys defaults via string") moved initialization of column headers but it
> missed to check the sort__mode.  As 'perf diff' doesn't call
> perf_hpp__init(), the setup_overhead() also should not be called.
> 
> Before:
> 
>   # Baseline    Delta  Children  Overhead  Shared Object        Symbol
>   # ........  .......  ........  ........  ...................  .......................
>   #
>       28.48%  -28.47%    28.48%    28.48%  [kernel.vmlinux ]    [k] intel_idle
>       11.51%  -11.47%    11.51%    11.51%  libxul.so            [.] 0x0000000001a360f7
>        3.49%   -3.49%     3.49%     3.49%  [kernel.vmlinux]     [k] generic_exec_single
>        2.91%   -2.89%     2.91%     2.91%  libdbus-1.so.3.8.11  [.] 0x000000000000cdc2
>        2.86%   -2.85%     2.86%     2.86%  libxcb.so.1.1.0      [.] 0x000000000000c890
>        2.44%   -2.39%     2.44%     2.44%  [kernel.vmlinux]     [k] perf_event_aux_ctx
> 
> After:
> 
>   # Baseline    Delta  Shared Object        Symbol
>   # ........  .......  ...................  .......................
>   #
>       28.48%  -28.47%  [kernel.vmlinux]     [k] intel_idle
>       11.51%  -11.47%  libxul.so            [.] 0x0000000001a360f7
>        3.49%   -3.49%  [kernel.vmlinux]     [k] generic_exec_single
>        2.91%   -2.89%  libdbus-1.so.3.8.11  [.] 0x000000000000cdc2
>        2.86%   -2.85%  libxcb.so.1.1.0      [.] 0x000000000000c890
>        2.44%   -2.39%  [kernel.vmlinux]     [k] perf_event_aux_ctx
> 
> Cc: stable <stable@...r.kernel.org>  # 4.5
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>

Acked-by: Jiri Olsa <jolsa@...nel.org>

thanks,
jirka

> ---
>  tools/perf/util/sort.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
> index 772e2e461ec3..20e69edd5006 100644
> --- a/tools/perf/util/sort.c
> +++ b/tools/perf/util/sort.c
> @@ -2438,6 +2438,9 @@ static char *prefix_if_not_in(const char *pre, char *str)
>  
>  static char *setup_overhead(char *keys)
>  {
> +	if (sort__mode == SORT_MODE__DIFF)
> +		return keys;
> +
>  	keys = prefix_if_not_in("overhead", keys);
>  
>  	if (symbol_conf.cumulate_callchain)
> -- 
> 2.8.2
>