Messages in this thread | | | Date | 11 Oct 2013 08:14:57 -0400 | From | "George Spelvin" <> | Subject | Re: [PATCH 0/6] Optimize the cpu hotplug locking -v2 |
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> 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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