linux-kernel - Re: [PATCH 4/7] perf report: Honor column width setting

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Date:	Mon, 28 Jul 2014 09:43:37 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
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 4/7] perf report: Honor column width setting

On Fri, 25 Jul 2014 13:13:02 +0200, Jiri Olsa wrote:
> On Fri, Jul 25, 2014 at 10:18:55AM +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.
>> 
>> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
>> ---
>
> SNIP
>
>>  
>>  __HPP_COLOR_PERCENT_FN(overhead, period)
>> @@ -797,8 +798,11 @@ static int hist_browser__show_entry(struct hist_browser *browser,
>>  			if (fmt->color) {
>>  				width -= fmt->color(fmt, &hpp, entry);
>>  			} else {
>> -				width -= fmt->entry(fmt, &hpp, entry);
>> +				int ret = fmt->entry(fmt, &hpp, entry);
>> +				s[ret] = '\0';
>>  				slsmg_printf("%s", s);
>
> from quick check it seems like all entry callback functions
> use some sort of snprint which should already handle the string
> length properly.. if not, we should fix that instead, no?

It was 'symbol' sort entry (_hist_entry__sym_snprintf) which has several
snprint calls in it.  So I changed here rather than adding complexity
the print function.  I can change it if you want. ;)

Thanks,
Namhyung
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