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SubjectRe: [rfc patch v4.4-rt2] sched: fix up preempt lazy forward port
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On Tue, 2016-01-19 at 05:41 +0100, Mike Galbraith wrote:
> On Mon, 2016-01-18 at 21:18 +0100, Sebastian Andrzej Siewior wrote:
>
> > > --- a/kernel/sched/core.c
> > > +++ b/kernel/sched/core.c
> > > @@ -3542,6 +3542,15 @@ asmlinkage __visible void __sched notrac
> > > if (likely(!preemptible()))
> > > return;
> > >
> > > +#ifdef CONFIG_PREEMPT_LAZY
> > > + /*
> > > + * Check for lazy preemption
> > > + */
> > > + if (current_thread_info()->preempt_lazy_count &&
> > > + !test_thread_flag(TIF_NEED_RESCHED))
> > > + return;
> > > +#endif
> > > +
> >
> > And this is a new piece. So you forbid that tasks leave the CPU if
> > lazy_count > 0. Let me look closed why this is happening and if
> > this is
> > v4.1 … v4.4 or not.
>
> That check wants a !rt_task(current) qualifier anyway.

(bah, -ESWILLMORECOFFEE)

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