linux-kernel - Re: [PATCH 4/6] perf report: Honor column width setting

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Message-ID: <20140724124748.GB7652@krava.brq.redhat.com>
Date:	Thu, 24 Jul 2014 14:47:48 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Namhyung Kim <namhyung.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/6] perf report: Honor column width setting

On Wed, Jul 09, 2014 at 02:28:12PM +0900, Namhyung Kim wrote:
> Set column width and do not change it if user gives -w/--column-widths
> option.  It'll truncate longer symbols than the width if exists.

SNIP

>  
>  static inline void advance_hpp(struct perf_hpp *hpp, int inc)
>  {
> diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
> index 396b0094943d..f89714329c0f 100644
> --- a/tools/perf/util/sort.c
> +++ b/tools/perf/util/sort.c
> @@ -70,7 +70,9 @@ static int hist_entry__thread_snprintf(struct hist_entry *he, char *bf,
>  				       size_t size, unsigned int width)
>  {
>  	const char *comm = thread__comm_str(he->thread);
> -	return repsep_snprintf(bf, size, "%-*s:%5d", width - 6,
> +
> +	width = max(7U, width) - 6;
> +	return repsep_snprintf(bf, size, "%-*.*s:%5d", width, width,
>  			       comm ?: "", he->thread->tid);

I couldn't found what your format string:
  "%-*.*s:%5d", width, width

is supposed to do... it gives me the same result as for:
  "%-*s:%5d", width

you use it on more places so I guess it's not a typo ;-)

thanks,
jirka
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