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. We should probably just add the lazy bits to preemptible(). -Mike -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
