linux-kernel - Re: [PATCH V2 1/9] perf tools: add test for reading object code

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Date:	Thu, 1 Aug 2013 11:32:52 +0900
From:	Namhyung Kim <namhyung@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Adrian Hunter <adrian.hunter@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>, Mike Galbraith <efault@....de>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH V2 1/9] perf tools: add test for reading object code

Hi Peter,

On Wed, Jul 31, 2013 at 11:24 PM, Peter Zijlstra <peterz@...radead.org> wrote:
> On Wed, Jul 31, 2013 at 11:17:32AM -0300, Arnaldo Carvalho de Melo wrote:
>> Em Wed, Jul 31, 2013 at 12:13:50AM +0300, Adrian Hunter escreveu:
>> > Using the information in mmap events, perf tools can read object
>> > code associated with sampled addresses.  A test is added that
>> > compares bytes read by perf with the same bytes read using
>> > objdump.
>>
>> So this parses objdump output, and we also already have the annotation
>> logic that does that too, have you thought about having common routines
>> for these two cases?
>>
>
> Or better yet, stop using objdump like this and start using libbfd
> directly. The only reason we did horrible things like parsing objdump
> output is because nobody knew how the underlying stuff actually worked
> and we wanted to have something quick.

I have similar patch for getting srcline info (using addr2line) based
on Roberto Vitillo's patch.  I'll send the series soon and then look
at the objdump too.


-- 
Thanks,
Namhyung Kim
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