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SubjectRe: [PATCH] fs/devfs/base.c
> It's trivial to calculate for DAGs -- directed acyclic graphs.  It's
> when the "acyclic" constraint is violated that you have problems!

It may well be that interrupt stacks are a win anyway. If we can get the kernel
struct out of the stack pages (which would fix some very unpleasant cache
colour problems) and take the non irq stack down to 4K then irq stacks would
pay off once you had 25 or so processes on a system
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