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

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Message-ID: <20081026134904.GG8210@redhat.com>
Date:	Sun, 26 Oct 2008 09:49:05 -0400
From:	"Frank Ch. Eigler" <fche@...hat.com>
To:	Török Edwin <edwintorok@...il.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>, fweisbec@...il.com,
	mingo@...e.hu, srostedt@...hat.com, sandmann@...mi.au.dk,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] Add support for userspace stacktraces in tracing/iter_ctrl

Hi -

On Sun, Oct 26, 2008 at 03:38:45PM +0200, Török Edwin wrote:

> [...]  In userspace I can get a stacktrace using DWARF unwind info,
> but doing that in the kernel would be too expensive, right? [...]

We're experimenting with just that in systemtap.  The expenses
(memory: megabytes of unwind data, time: running code to process it)
would be paid only for the duration of a systemtap script that needs
that particular sort of information.

- FChE
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