linux-kernel - Re: [2/2] vmallocinfo: Add caller information

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Date:	Tue, 29 Apr 2008 21:29:13 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Christoph Lameter <clameter@....com>
Cc:	Arjan van de Ven <arjan@...radead.org>, akpm@...ux-foundation.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [2/2] vmallocinfo: Add caller information


* Christoph Lameter <clameter@....com> wrote:

> On Mon, 28 Apr 2008, Arjan van de Ven wrote:
> 
> > > Hmmm... Why do we have CONFIG_FRAMEPOINTER then?
> > 
> > to make the backtraces more accurate.
> 
> Well so we display out of whack backtraces? There are also issues on 
> platforms that do not have a stack in the classic sense (rotating 
> register file on IA64 and Sparc64 f.e.). Determining a backtrace can 
> be very expensive.

they have to solve that for kernel oopses and for lockdep somehow 
anyway. Other users of stacktrace are: fault injection, kmemcheck, 
latencytop, ftrace. All new debugging and instrumentation code uses it, 
and for a good reason.

	Ingo
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