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

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Date:	Tue, 17 Jul 2007 01:35:54 +0200
From:	"Jesper Juhl" <jesper.juhl@...il.com>
To:	"Rene Herman" <rene.herman@...il.com>
Cc:	"Ray Lee" <ray-lk@...rabbit.org>, "Bodo Eggert" <7eggert@....de>,
	"Matt Mackall" <mpm@...enic.com>,
	"Jeremy Fitzhardinge" <jeremy@...p.org>,
	"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 17/07/07, Rene Herman <rene.herman@...il.com> wrote:
> On 07/17/2007 01:13 AM, Ray Lee wrote:
>
> > Given that there's actual, y'know, reports of people who can easily
> > crash a 4k+interrupt stacks kernel, and not an 8k one, I think the
> > current evidence speaks for itself.
>
> Where?
>
> > The point remains that the burden of proof of the safety of the 4k only
> > option is upon those people who want to remove the 8k option.
>
> Removing any such option was not the objective of this thread, just lifting
> 4K stacks from debug and making it the default. People fortunate enough to
> use workloads where some piece of crap code by accident works more often
> with the current shared 8K stacks then it does with the unshared 4K stacks
> can then still nicely not select it (or fix the code if possible).
>
I may have worded the initial email a bit too heavily towards 8K
removal, but that was mainly to provoke some discussion.  Nothing
should get removed without a fair (and long) warning in
feature-removal-schedule.txt and ofcourse not before we know that the
new option is at least as safe as what we intend to remove, so the
patch really was just intended as a fairly harmless nudge towards
getting 4K stacks into a shape where we can eventually start
considering 8K removal.

-- 
Jesper Juhl <jesper.juhl@...il.com>
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