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

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Date:	Tue, 17 Jul 2007 01:51:58 +0200
From:	"Jesper Juhl" <jesper.juhl@...il.com>
To:	"Bodo Eggert" <7eggert@....de>
Cc:	"Ray Lee" <ray-lk@...rabbit.org>,
	"Rene Herman" <rene.herman@...il.com>,
	"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, Bodo Eggert <7eggert@....de> wrote:
> On Tue, 17 Jul 2007, Jesper Juhl wrote:
>
> > Please note that I was not trying to remove the 8K stack option right
> > now - heck, I didn't even add anything to feature-removal-schedule.txt
> > - all I wanted to accomplish with the patch that started this threas
> > was;  a) indicate that the 4K option is no longer a debug thing  and
>
> Very ACK.
>
Ok, so perhaps a patch to do just that bit could go towards mainline
(possibly after a short stay in -mm).

> > b) make 4K stacks the default option in vanilla kernel.org kernels as
> > a gentle nudge towards getting people to start fixing the code paths
> > that are not 4K stack safe.
>
> That's the big NACK. It's OK for MM, where things are supposed to be in a
> not well-tested state, but for running possibly mission-critical systems,
> you should take no risk.
>
Hmm, I guess it would make sense to stick it in -mm for an extended
period of time, but hold off on mainline until we start hearing
positive noises that people can no longer break 4K stacks...

> If you'd run a 4K stack on the NFS+XFS+LVM+dmcrypt+MD+somethingmore
> setup driving your loved one's life support, you may go ahead.

;-)


How about if I split it into two tiny patches
 - one that just makes it no longer a debug option and moves the
option out of the "kernel hacking" submenu and into "general setup"
instead, but leave it to default to N.
 - and then one that makes it default Y.
and then submit those two patches to Andrew for inclusion in -mm with
a clear note that only the first one should go upstream anytime soon
and the second one should be kept "strictly -mm" until we arrive at
the point in time where people can no longer break 4K.
How does that sound?
>From my point of view that would accomplish my objective of getting 4K
stacks some more testing and the indication that long-term that's the
way we probably want to move.

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