linux-kernel - Re: [PATCH 1/4] Add support for userspace stacktraces in tracing/iter

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Date:	Sun, 26 Oct 2008 09:03:43 +0200
From:	Török Edwin <edwintorok@...il.com>
To:	Frédéric Weisbecker <fweisbec@...il.com>
CC:	mingo@...e.hu, srostedt@...hat.com, a.p.zijlstra@...llo.nl,
	sandmann@...mi.au.dk, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] Add support for userspace stacktraces in tracing/iter_ctrl

On 2008-10-26 06:05, Frédéric Weisbecker wrote:
> Hi Török,
>
> I just read a bit more those two patches about user stack tracing.
> Note that despite the recent changes on the tracing Api
> (ring buffer and other stuff), it still applies well, with some little
> hunks. But it needs some updates to support the last changes.
>
> I adapted the patch and it builds well, but I didn't tested yet.
> However, some parts are "architecture dependent", I guess these
> special pieces would find a better place in the arch directory. So it
> would let a proper and seperated implementation.
>   

Hi,

The stacktrace code itself is in the arch directory, did I miss anything
else that should belong there?

arch/x86/kernel/stacktrace.c |   57 +++++++++++++++++++++++++++++++++++
include/linux/stacktrace.h   |    8 +++++


> And most arch implement a stacktrace implementation, even if yours
> involve special operations such as copy_from_user, I wonder if the
> already established code couldn't be reused for your needs.
>   

I think it would make sense to use oprofile's code of user stacktracing,
there  is a backtrace
operation in 'struct oprofile_operations'. Perhaps that could be
extended so that non-oprofile code can call it?
[currently it uses oprofile_add_trace to store the stacktrace]

Best regards,
--Edwin
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