Re: [RFC][PATCH 3/7] sched: Allow balance callbacks for check_class_changed()

[Peter Zijlstra]

On Wed, Jun 03, 2015 at 01:42:41PM +0300, Kirill Tkhai wrote:
> [resend]
> 
> 03.06.2015, 10:32, "Peter Zijlstra" <peterz@xxxxxxxxxxxxx>:
> > On Tue, Jun 02, 2015 at 07:27:19PM +0300, Kirill Tkhai wrote:
> >>>  + * task_dead_dl() will cancel our timer if we happen to die while
> >>>  + * its still pending.
> >>  task_dead_dl() is called for tasks of deadline class only. So if we do that,
> >>  the timer may be executed after final task's dead.
> >
> > Indeed; sleep deprived brain misses the obvious :/
> 
> I have an idea, but it require small hrtimer modification. We may use
> task_struct counters {get,put}_task_struct(), when we're starting or cancelling
> the timer, and in timer handler. But it require to return back the commit:

Yeah, already working on that. :-)
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