linux-kernel - Re: [PATCH] perf hists: Fix period symbol_conf.field

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Message-ID: <20121129173509.GA1957@ghostprotocols.net>
Date:	Thu, 29 Nov 2012 14:35:09 -0300
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Namhyung Kim <namhyung@...nel.org>, linux-kernel@...r.kernel.org,
	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] perf hists: Fix period symbol_conf.field_sep display,
 again

Em Thu, Nov 29, 2012 at 02:40:02PM +0100, Jiri Olsa escreveu:
> On Thu, Nov 29, 2012 at 12:53:44PM +0100, Jiri Olsa wrote:
> > On Thu, Nov 29, 2012 at 04:56:04PM +0900, Namhyung Kim wrote:
> 
> SNIP
> 
> > > > -		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.
> > 
> > hum, I'll retest
> 
> you're right, fix is attached
> 
> Arnaldo, I know you've already pulled this one.. I can resend v2
> if needed, which is shorter (just that 'first = false' move as
> Namhyyung said)

I just folded it, was the tip of the tree, will go on processing the
others now.
 
> thanks,
> jirka
> 
> 
> ---
> Last fix of this place was wrong and caused the separator
> field to be displayed even before period column.
> 
> Should be fixed properly this time by introducing 'first' bool
> like on other places doing the same stuff.
> 
> Screwed-up-by: Jiri Olsa <jolsa@...hat.com>
> Reported-by: Namhyung Kim <namhyung@...nel.org>
> 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>
> Signed-off-by: Jiri Olsa <jolsa@...hat.com>
> ---
>  tools/perf/ui/hist.c | 12 ++++++++++--
>  1 file changed, 10 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/perf/ui/hist.c b/tools/perf/ui/hist.c
> index 2447e0c..6e639b5 100644
> --- a/tools/perf/ui/hist.c
> +++ b/tools/perf/ui/hist.c
> @@ -466,13 +466,21 @@ 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) {
> -		ret = scnprintf(hpp->buf, hpp->size, "%s", sep ?: "  ");
> -		advance_hpp(hpp, ret);
> +		/*
> +		 * If there's no field_sep, we still need
> +		 * to display initial '  '.
> +		 */
> +		if (!sep || !first) {
> +			ret = scnprintf(hpp->buf, hpp->size, "%s", sep ?: "  ");
> +			advance_hpp(hpp, ret);
> +		} else
> +			first = false;
>  
>  		if (color && fmt->color)
>  			ret = fmt->color(hpp, he);
> -- 
> 1.7.11.7
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