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

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On 17/07/07, Bodo Eggert <[email protected]> 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 <[email protected]>
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