linux-kernel - Re: [PATCH 03/14] perf tool: Fix period symbol_conf.field

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Date:	Thu, 29 Nov 2012 16:56:04 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>, Paul Mackerras <paulus@...ba.org>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCH 03/14] perf tool: Fix period symbol_conf.field_sep display

On Wed, 28 Nov 2012 14:52:38 +0100, Jiri Olsa wrote:
> Currently we don't properly display hist data with
> symbol_conf.field_sep separator. We need to display
> either space or separator.
>
> Signed-off-by: Jiri Olsa <jolsa@...hat.com>
> Cc: Arnaldo Carvalho de Melo <acme@...stprotocols.net>
> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Cc: Ingo Molnar <mingo@...e.hu>
> Cc: Paul Mackerras <paulus@...ba.org>
> Cc: Corey Ashford <cjashfor@...ux.vnet.ibm.com>
> Cc: Frederic Weisbecker <fweisbec@...il.com>
> Cc: Namhyung Kim <namhyung@...nel.org>
> ---
>  tools/perf/ui/hist.c | 8 ++------
>  1 file changed, 2 insertions(+), 6 deletions(-)
>
> diff --git a/tools/perf/ui/hist.c b/tools/perf/ui/hist.c
> index 5452960..20a4392 100644
> --- a/tools/perf/ui/hist.c
> +++ b/tools/perf/ui/hist.c
> @@ -523,17 +523,13 @@ int hist_entry__period_snprintf(struct perf_hpp *hpp, struct hist_entry *he,
>  	struct perf_hpp_fmt *fmt;
>  	char *start = hpp->buf;
>  	int ret;
> -	bool first = true;
>  
>  	if (symbol_conf.exclude_other && !he->parent)
>  		return 0;
>  
>  	perf_hpp__for_each_format(fmt) {
> -		if (!sep || !first) {
> -			ret = scnprintf(hpp->buf, hpp->size, "%s", sep ?: "  ");
> -			advance_hpp(hpp, ret);
> -			first = false;
> -		}
> +		ret = scnprintf(hpp->buf, hpp->size, "%s", sep ?: "  ");
> +		advance_hpp(hpp, ret);

It will display the separator even before the first column so that the
output can be messed up with this.  I can see that there's a bug setting
'first' to false - the line should be moved out of the block otherwise
it's pointless since we cannot enter the block.

Thanks,
Namhyung

>  
>  		if (color && fmt->color)
>  			ret = fmt->color(fmt, hpp, he);
--
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