From: Ingo Molnar <mingo@elte.hu>
To: David Miller <davem@davemloft.net>
Cc: acme@infradead.org, linux-kernel@vger.kernel.org,
fweisbec@gmail.com, efault@gmx.de, a.p.zijlstra@chello.nl,
paulus@samba.org
Subject: Re: [PATCH 2/2] perf top: Properly notify the user that vmlinux is missing
Date: Tue, 16 Mar 2010 10:55:23 +0100 [thread overview]
Message-ID: <20100316095523.GJ7961@elte.hu> (raw)
In-Reply-To: <20100316.025134.196872789.davem@davemloft.net>
* David Miller <davem@davemloft.net> wrote:
> From: Ingo Molnar <mingo@elte.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
next prev parent reply other threads:[~2010-03-16 9:55 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-15 14:46 [PATCH 1/2] perf record: Enable the enable_on_exec flag if record forks the target Arnaldo Carvalho de Melo
2010-03-15 14:46 ` [PATCH 2/2] perf top: Properly notify the user that vmlinux is missing Arnaldo Carvalho de Melo
2010-03-15 18:55 ` David Miller
2010-03-15 19:21 ` Arnaldo Carvalho de Melo
2010-03-15 19:26 ` David Miller
2010-03-16 9:46 ` Ingo Molnar
2010-03-16 9:51 ` David Miller
2010-03-16 9:55 ` Ingo Molnar [this message]
2010-03-16 9:58 ` David Miller
2010-03-15 15:15 ` [tip:perf/core] perf record: Enable the enable_on_exec flag if record forks the target tip-bot for Eric B Munson
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