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

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Message-ID: <84144f020804291223x6e40509fk8461ed4d96d443b@mail.gmail.com>
Date:	Tue, 29 Apr 2008 22:23:02 +0300
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Christoph Lameter" <clameter@....com>
Cc:	"Arjan van de Ven" <arjan@...radead.org>,
	"Ingo Molnar" <mingo@...e.hu>, 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

On Tue, Apr 29, 2008 at 10:09 PM, Christoph Lameter <clameter@....com> wrote:
>  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.

I think that's the key question here whether we need to enable this on
production systems? If yes, why? If it's just a debugging aid, then I
see Ingo's point of save_stack_trace(); otherwise the low-overhead
__builtin_return_address() makes more sense.

And btw, why is this new file not in /sys/kernel....?
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