> 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 ;)
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