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SubjectRe: [PATCH 0/6] Optimize the cpu hotplug locking -v2
> There's places in the kernel that does for_each_cpu() that I'm sure you
> don't want to disable preemption for. Especially when you start having
> 4096 CPU machines!

Er... why not?

Seriously. If I have 4096 processors, and preemption is disabled on
*one* of them for a long time, can't an urgent task just find a different
processor to preempt?

This seems like a non-problem. Or am I misunderstanding something about
processor affinity?


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