Re: current linux-2.6.git: cpusets completely broken

[Steven Rostedt]

On Mon, 14 Jul 2008, Linus Torvalds wrote:
> So by doing the test for cpu_active_map not at queuing time, but at the
> time when we actually try to do the migration, we can now also make that
> cpu_active_map be totally serialized.
>
> (Of course, anybody who clears the bit does need to take the runqueue lock
> of that CPU too, but cpu_down() will have to do that as it does the
> "migrate away live tasks" anyway, so that's not a problem)

Wouldn't simply doing a synchronize_sched() after clearing the bit also
make sure that no new task will be scheduled on that CPU?

-- Steve

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