linux-kernel - Re: Large stack usage in fs code (especially for PPC64)

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Date:	Tue, 18 Nov 2008 04:53:05 -0500
From:	Christoph Hellwig <hch@...radead.org>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Paul Mackerras <paulus@...ba.org>, linuxppc-dev@...abs.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: Large stack usage in fs code (especially for PPC64)

On Tue, Nov 18, 2008 at 10:03:25AM +1100, Benjamin Herrenschmidt wrote:
> On Mon, 2008-11-17 at 15:34 -0500, Steven Rostedt wrote:
> > Note, I was using a default config that had CONFIG_IRQSTACKS off and
> > CONFIG_PPC_64K_PAGES on.
> 
> For one, we definitely need to turn IRQSTACKS on by default ... In fact,
> I'm pondering just removing the option.

It shouldn't be a user-visible option.  It shouldn't on x86 either, but
there it always gets into the ideological 4k stacks flameware so people
usually gave up after a while instead of doing the sensibke 8k +
irqstacks by default, 4k as an option..

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