linux-kernel - Re: [PATCH 2/2] perf top: Properly notify the user that vmlinux is missing

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Message-ID: <20100316095523.GJ7961@elte.hu>
Date:	Tue, 16 Mar 2010 10:55:23 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	David Miller <davem@...emloft.net>
Cc:	acme@...radead.org, linux-kernel@...r.kernel.org,
	fweisbec@...il.com, efault@....de, a.p.zijlstra@...llo.nl,
	paulus@...ba.org
Subject: Re: [PATCH 2/2] perf top: Properly notify the user that vmlinux is
 missing


* David Miller <davem@...emloft.net> wrote:

> From: Ingo Molnar <mingo@...e.hu>
> Date: Tue, 16 Mar 2010 10:46:11 +0100
> 
> > i'd really like that to happen - i.e. if we had the kernel (and modules) image 
> > exposed as a (almost-)standard ELF object via /sys or so.
> > 
> > We already have some aspects of that, via /sys/kernel/notes, but it should be 
> > done for real. That would also make build-id support less of a hack.
> > 
> > ( I'd not include CFI debuginfo in there though - that would be way too large.
> >   More compressed debuginfo could be included perhaps. )
> 
> That's interesting and useful, but wouldn't help my case as the images I'm 
> usually booting are completely stripped.

/me too

> That's why I end up with "[kernel.kallsyms]" for kernel profiling :-)

The kernel image itself is still present in RAM, obviously. So are the symbols 
(packed for kallsyms).

So exposing a virtual ELF image via /sys (or /proc/kernel.so) wouldnt take up 
much more RAM and would be rather useful, right?

	Ingo
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