Messages in this thread | | | Date | Tue, 20 Dec 2005 19:12:04 +0100 | From | Adrian Bunk <> | Subject | Re: [2.6 patch] i386: always use 4k stacks |
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On Tue, Dec 20, 2005 at 09:56:10AM -0800, David Lang wrote: > On Tue, 20 Dec 2005, Horst von Brand wrote: > > > > >"With some drawbacks" is the point: It has been determined that the > >drawbacks are heavy enough that the 8KiB stack option should go. Given > >there is /no/ compelling argument /against/ 4KiB stacks, even very minor > >drawbacks are important. So first make 4KiB the standard (popular > >distributions work that way for /years/ now, with no measurable downsides), > > at least one of the 'popular distributions' that switched to 4k stacks > years ago worked around the problems that it generated by simply lableing > the portions that didn't work with 4k stacks as 'unsupported by this > distro' (XFS has been explicitly stated to be in this catagory in these > discussions)
AFAIK, XFS is the only example. And the XFS related problems have already been fixed.
> how many other corner cases are there that these distros just choose not > to support, but need to be supported and tested for the vanilla kernel?
My count of bug reports for problems with in-kernel code with 4k stacks after Neil's patch went into -mm is still at 0.
If 4k stacks were as unstable as you imply, why has noone been able to point to _one single_ problem with 4k stacks that is still present after Neil's patch went into -mm?
> also for those who are arguing that it's only dropping from 6k to 4k, you > are forgetting that the patches to move the interrupts to a seperate stack > have already gone into the kernel, so today it is really 8k+4k and the > talk is to move it to 4k+4k. >...
That's complete bullshit.
Currently, seperate irq stacks are only used with CONFIG_4KSTACKS=y.
> David Lang
cu Adrian
--
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