linux-kernel - Re: [PATCH 05/10] perf hists: Fixup addr snprintf width on 32 bit arches

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Date:	Fri, 06 Aug 2010 08:35:32 -0700
From:	Joe Perches <joe@...ches.com>
To:	Arnaldo Carvalho de Melo <acme@...radead.org>
Cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Frederic Weisbecker <fweisbec@...il.com>,
	Mike Galbraith <efault@....de>,
	Peter Zijlstra <peterz@...radead.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 05/10] perf hists: Fixup addr snprintf width on 32 bit
 arches

On Fri, 2010-08-06 at 11:29 -0300, Arnaldo Carvalho de Melo wrote:
> Em Thu, Aug 05, 2010 at 06:58:07PM -0700, Joe Perches escreveu:
> > On Thu, 2010-08-05 at 22:46 -0300, Arnaldo Carvalho de Melo wrote:
> > > From: Arnaldo Carvalho de Melo <acme@...hat.com>
> > > By using BITS_PER_LONG/4 as the width specifier.
> > []
> > > diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
> > > index 1c61a4f..b62a553 100644
> > > --- a/tools/perf/util/sort.c
> > > +++ b/tools/perf/util/sort.c
> > []
> > > -		ret += repsep_snprintf(bf, size, "%#018llx %c ", self->ip, o);
> > > +		ret += repsep_snprintf(bf, size, "%*Lx %c ",
> > > +				       BITS_PER_LONG / 4, self->ip, o);
> > []
> > > -		ret += repsep_snprintf(bf + ret, size - ret, "%#016llx", self->ip);
> > > +		ret += repsep_snprintf(bf + ret, size - ret, "%*Lx",
> > > +				       BITS_PER_LONG / 4, self->ip);
> > 
> > This drops leading 0's.
> 
> Is this a problem? This removes clutter from the output, right?

Dunno, you made an output that looked like a pointer address,

64 bit:

"0x0123456789abcdef" now is " 123456789abcdef"

32 bit:

"0x0000000001234567" now is " 1234567"

snprintf(loc, size, "%#0*lx", BITS_PER_LONG / 4 + 2, (long))
might be better.

snprintf(loc, size, "%p", (void)long)
might be best.





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