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

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Date:	Mon, 28 Apr 2008 14:00:26 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Christoph Lameter <clameter@....com>
Cc:	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, 29 Apr 2008 11:49:54 -0700 (PDT)
Christoph Lameter <clameter@....com> wrote:

> On Mon, 28 Apr 2008, Arjan van de Ven wrote:
> 
> > > Sorry lost track of this issue. Adding stracktrace support is not
> > > a trivial thing and will change the basic handling of vmallocinfo.
> > > 
> > > Not sure if stacktrace support can be enabled without a penalty on
> > > various platforms. Doesnt this require stackframes to be
> > > formatted in a certain way?
> > 
> > it doesn't.
> 
> Hmmm... Why do we have CONFIG_FRAMEPOINTER then?

to make the backtraces more accurate.


> The current implementation of vmalloc_caller() follows what we have
> done with kmalloc_track_caller. Its low overhead and always on.

stacktraces aren't entirely free, the cost is O(nr of modules) unfortunately ;(
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