linux-kernel - Re: x86: 4kstacks default

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Message-Id: <1208998600.9060.86.camel@pasglop>
Date:	Thu, 24 Apr 2008 10:56:40 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	David Chinner <dgc@....com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: x86: 4kstacks default


On Thu, 2008-04-24 at 09:36 +1000, David Chinner wrote:
> > Do we routinely test nasty scenarii such as a GFP_KERNEL allocation
> deep
> > in a call stack trying to swap something out to NFS ?
> 
> I doubt it, because this is the place that a local XFS filesystem
> typically blows a 4k stack (direct memory reclaim triggering
> ->writepage). Boot testing does nothing to exercise the potential
> paths for stack overflows....

Yup, note even counting when the said NFS is on top of some fancy
network stack with a driver on top of USB .... I mean, we do have
potential for worst case scenario that I think -will- blow a 4k stack.

Ben.


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