Re: [PATCH] sched/rt: don't try to balance rt_runtime when it is futile

[Peter Zijlstra]

On Tue, May 20, 2014 at 06:24:36PM +0200, Frederic Weisbecker wrote:
> Of course one can argue that we can find out that the task is resuming in userspace from
> CPU 0 scheduler entry without the need for previous context tracking, but I couldn't find safe
> solution for that. This is because probing on user/kernel boundaries can only be done
> in the soft way, throught explicit function calls. So there is an inevitable shift
> between soft and hard boundaries, between what we probe and what we can guess.

you can hook into set_task_cpu(), not sure its going to be pretty, but
that is _the_ place to hook migration related nonsense.
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