linux-kernel - Re: x86: 4kstacks default

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Message-ID: <20080420142131.GD1899@cs181133002.pp.htv.fi>
Date:	Sun, 20 Apr 2008 17:21:31 +0300
From:	Adrian Bunk <bunk@...nel.org>
To:	Eric Sandeen <sandeen@...deen.net>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Shawn Bohrer <shawn.bohrer@...il.com>,
	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 Sun, Apr 20, 2008 at 09:05:40AM -0500, Eric Sandeen wrote:
> Adrian Bunk wrote:
> 
> > But the more users will get 4k stacks the more testing we have, and the 
> > better both existing and new bugs get shaken out.
> > 
> > And if there were only 4k stacks in the vanilla kernel, and therefore 
> > all people on i386 testing -rc kernels would get it, that would give a 
> > better chance of finding stack regressions before they get into a 
> > stable kernel.
> 
> Heck, maybe you should make it 2k by default in all -rc kernels; that
> way when people run -final with the 4k it'll be 100% bulletproof, right?
>  'cause all those piggy drivers that blow a 2k stack will finally have
> to get fixed?

I'm arguing for aiming at having all 32bit architectures with 4k page 
size using the same stack size. Not for having -rc kernels differ from 
release kernels.

>  Or leave it at 2k and find a way to share pages for
> stacks, think how much memory you could save and how many java threads
> you could run!

The only architecture that already defaults to 4k stacks is m68knommu, 
and I doubt they do it for many java threads...

>...
> -Eric
>...

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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