Re: [patch 08/15] sched: migrate throttled tasks on HOTPLUG

[Peter Zijlstra]

On Tue, 2011-03-22 at 20:03 -0700, Paul Turner wrote:
> Throttled tasks are invisisble to cpu-offline since they are not eligible for
> selection by pick_next_task().  The regular 'escape' path for a thread that is
> blocked at offline is via ttwu->select_task_rq, however this will not handle a
> throttled group since there are no individual thread wakeups on an unthrottle.
> 
> Resolve this by unthrottling offline cpus so that threads can be migrated.

Fair enough, the flip side is that they all can again increase their
debt by a whole tick, right?
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