linux-kernel - Re: [PATCH 6/7] perf tools: Do not need to read symbols for source line lookup

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Date:	Wed, 4 Dec 2013 15:08:10 -0300
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	Adrian Hunter <adrian.hunter@...el.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>, Mike Galbraith <efault@....de>,
	Namhyung Kim <namhyung@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 6/7] perf tools: Do not need to read symbols for source
 line lookup

Em Wed, Dec 04, 2013 at 04:00:18PM +0200, Adrian Hunter escreveu:
> On 03/12/13 22:24, Arnaldo Carvalho de Melo wrote:
> > Em Tue, Dec 03, 2013 at 09:23:09AM +0200, Adrian Hunter escreveu:
> >> When using libbfd to lookup source filename and line number,
> >> libbfd does not need the symbol table.  Removing the symbol
> >> table reading, doubles the speed of 'perf script' with the
> >> 'srcline' option.
> > 
> > [root@zoo ~]# gdb perf
> > run report -s srcline
> > 
> > b00000m
> 
> I wasn't able to reproduce this but I noticed the line numbers
> were not found for kernel modules with this patch - so it seems
> some binaries need the symbol information and some don't.
> 
> So please disregard this patch, sorry for your trouble.

No problem, disregarding it.

- Arnaldo
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