Re: [2.6 patch] i386: always use 4k stacks

[Adrian Bunk]

On Thu, Dec 15, 2005 at 02:00:13PM -0800, Andrew Morton wrote:
> Adrian Bunk <bunk@xxxxxxxxx> wrote:
> >
> > This patch was already sent on:
> > - 11 Dec 2005
> > - 5 Dec 2005
> > - 30 Nov 2005
> > - 23 Nov 2005
> > - 14 Nov 2005
> 
> Sigh.  I saw the volume of email last time and though "gee, glad I wasn't
> cc'ed on that lot".

If you substract the "this breaks my binary-only M$ Windows driver" 
emails there's not much volume left.

> Supporting 8k stacks is a small amount of code and nobody has seen a need
> to make changes in there for quite a long time.  So there's little cost to
> keeping the existing code.
> 
> And the existing code is useful:
> 
> a) people can enable it to confirm that their weird crash was due to a
>    stack overflow.
> 
> b) If I was going to put together a maximally-stable kernel for a
>    complex server machine, I'd select 8k stacks.  We're still just too
>    squeezy, and we've had too many relatively-recent overflows, and there
>    are still some really deep callpaths in there.

a1) People turn off 4k stacks and never report the problem / noone 
    really debugs and fixes the reported problem.

Me threatening people with enabling 4k stacks for everyone already 
resulted in several fixes.

An how many weird crashes with _different_ causes have you seen?
It could be that there are only _very_ few problems that noone really 
debugs brcause disabling 4k stacks fixes the issue.

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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