linux-kernel - Re: [PATCH 6/8] perf record: Do not save pathname in ./debug/.build-id directory for vmlinux

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Date:	Wed, 05 Nov 2014 11:54:29 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Namhyung Kim <namhyung.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Jiri Olsa <jolsa@...hat.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	David Ahern <dsahern@...il.com>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 6/8] perf record: Do not save pathname in ./debug/.build-id directory for vmlinux

Hi Arnaldo,

On Tue, 4 Nov 2014 10:29:04 -0300, Arnaldo Carvalho de Melo wrote:
> Em Tue, Nov 04, 2014 at 10:14:32AM +0900, Namhyung Kim escreveu:
>> When perf record finishes a session recording, it then pre-process
>> samples in order to write build-id info from actually used DSOs.
>> During this process it'll call map__load() for kernel map, and it ends
>> up calling dso__load_vmlinux_path() which replaces dso->long_name.
>
> Can't we achieve the same end result without introducing yet another
> symbol_conf entry?
>
> I think there are way too many there, we need to remove, not add :-\

Agreed.

I also wanted to do it without a new entry, but failed to find a good
way of it as it's a common code called both from record and report path
and lives in a deep inside of sample processing.

>
> I'll add this since it improve the end result, but if you don't beat me
> to it I'll try to remove this symbol_conf entry while keeping the end
> result you achieved with it.

It'd be really appreciated!

Thanks,
Namhyung
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