On Tue, 20 Dec 2005, Arjan van de Ven wrote:
>
>> A kernel stack is simply an implimentation detail. Somebody made
>> an early decision to use non-paged memory for stacks. From that
>> point one, we have to either live with it or change it. The
>> change doesn't involve size. It involves kind.
>
> it involves a whole lot, like banning dma from the stack, and to make it
> swapable or kmapped you'd even need to fix all the places that put
> things like wait queues on the stack, as well as many other similar data
> structures. Staying at 4Kb is a lot easier than that ;)
>
Yes. No question about it. Once that decision was made, it defined a
lot of kernel internals. It just might be why Linux is such a good
performer, too. There are a lot of good things that might be caused
by the non-paged stack.
>
Cheers,
Dick Johnson
Penguin : Linux version 2.6.13.4 on an i686 machine (5589.56 BogoMips).
Warning : 98.36% of all statistics are fiction.
.
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