linux-kernel - Re: [PATCH][RFC] 4K stacks default, not a debug thing any more...?

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Message-ID: <20070716230719.GC11115@waste.org>
Date:	Mon, 16 Jul 2007 18:07:19 -0500
From:	Matt Mackall <mpm@...enic.com>
To:	Rene Herman <rene.herman@...il.com>
Cc:	Ray Lee <ray-lk@...rabbit.org>, Bodo Eggert <7eggert@....de>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Jesper Juhl <jesper.juhl@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	William Lee Irwin III <wli@...omorphy.com>,
	David Chinner <dgc@....com>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: [PATCH][RFC] 4K stacks default, not a debug thing any more...?

On Tue, Jul 17, 2007 at 12:55:36AM +0200, Rene Herman wrote:
> On 07/17/2007 12:37 AM, Ray Lee wrote:
> 
> >On 7/16/07, Rene Herman <rene.herman@...il.com> wrote:
> 
> >>Seeing as how single-page stacks are much easier on the VM so that 
> >>creating those zillion threads should also be faster, at _some_
> >>percentage we get to say "and now to hell with the rest".
> >
> >This is the core dispute here. Stated differently, I hope you never
> >design a bridge that I have to drive over.
> >
> >Correctness first, optimization second. Introducing random and
> >difficult to trace crashes upon an unsuspecting audience of sysadmins
> >and users is not a viable option.
> 
> Quite. But unfortunately you didn't actually go into the bit on how given 
> seperate interrupt stacks, available stackspace might not actually _be_ 
> less after selecting CONFIG_4KSTCKS nor into Fedora and RHEL shipping it 
> already.
> 
> >If at some point one of the pro-4k stacks crowd can prove that all
> >code paths are safe
> 
> I'll do that the minute you prove the current shared 8K stacks are safe. Do 
> we have a deal?
> 
> >or introduce another viable alternative (such as Matt's idea for
> >extending the stack dynamically), then removing the 8k stacks option
> >makes sense.
> 
> I'm still waiting for larger soft-pages... does anyone in this thread have 
> a clue on their status?

Given that most x86 users won't want anything to do with them, it's
not going to help us at all here.

-- 
Mathematics is the supreme nostalgia of our time.
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