Re: [PATCH 0/6] Optimize the cpu hotplug locking -v2

[George Spelvin]

> The problem is that the scheduler doesn't see that the current task has
> preemption disabled. It only looks at the priorities of the current
> task, and if it can preempt it, it will. It sets the NEED_RESCHED to the
> current task and waits for the preemption to schedule it out.

Ah, got it.  It's a priority inversion problem, and while there is a
standard solution (priority inheritance), if I were to suggest such a
heavyweight solution, Linus would start yelling again and Sarah would
get unhappy, and we all know how that ends up.

Thank you.  I will now cease displaying my ignorance in public.
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