Re: [2/6] add config option to vmalloc stacks (was: Re: [-mm patch] i386: enable 4k stacks by default)

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> These IRQ stacks are per-cpu, not per-IRQ. It may make sense to
> implement per-IRQ stacks, in which case dynamic allocation at the time
> of request_irq() will make sense.

This depends if active IRQ count exceeds active CPU count worst cases.
For the big boxes it might well do but for small ones we seem to be best
with per CPU.

Alan
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