linux-kernel - Re: [RFC/PATCHSET 0/8] perf tools: Minimal build without libelf dependency (v2)

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Date:	Fri, 22 Jun 2012 09:18:34 -0600
From:	David Ahern <dsahern@...il.com>
To:	Namhyung Kim <namhyung@...il.com>
CC:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>, Jiri Olsa <jolsa@...hat.com>
Subject: Re: [RFC/PATCHSET 0/8] perf tools: Minimal build without libelf dependency
 (v2)

On 6/22/12 9:05 AM, Namhyung Kim wrote:
> Hi Peter,
>
> 2012-06-22 (금), 11:47 +0200, Peter Zijlstra:
>> On Fri, 2012-06-22 at 14:37 +0900, Namhyung Kim wrote:
>>> And then I realized that the perf record needs to know about the
>>> build-id's anyway. :( So I implemented a poor man's version of elf
>>> parser only for parsing the build-id info.
>>
>> Why? the very first versions didn't know about any of that nonsense :-)
>> It works just fine as long as you don't go change binaries around.
>>
>> That said, you did the work already, so no objection, just saying
>> builtids aren't that important.
>
> I'm not sure I understood you correctly. But 'perf record' needs to know
> about the build-id's to save them to perf.data for 'perf report' later.
> And 'perf archive' also needs to know about them to select necessary
> binaries for the session.
>

And build-id's are not required for report (-B option for record).

Also, the intent is for a small footprint binary for embedded systems. 
On such a system I would expect binaries and libraries to be stripped, 
so no point in running perf-archive.


David
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