Groups > linux.kernel > #1311943

Re: [rfc patch v4.4-rt2] sched: fix up preempt lazy forward port

From	Mike Galbraith <umgwanakikbuti@gmail.com>
Newsgroups	linux.kernel
Subject	Re: [rfc patch v4.4-rt2] sched: fix up preempt lazy forward port
Date	2016-01-19 06:20 +0100
Message-ID	<qSwRX-320-3@gated-at.bofh.it> (permalink)
References	<qSdZ0-6VF-3@gated-at.bofh.it> <qSorp-5DG-23@gated-at.bofh.it> <qSwoW-2D4-7@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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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)

Thread

[rfc patch v4.4-rt2] sched: fix up preempt lazy forward port Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-01-18 10:10 +0100
  Re: [rfc patch v4.4-rt2] sched: fix up preempt lazy forward port Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-01-18 21:20 +0100
    Re: [rfc patch v4.4-rt2] sched: fix up preempt lazy forward port Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-01-19 03:40 +0100
      Re: [rfc patch v4.4-rt2] sched: fix up preempt lazy forward port Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-01-21 14:00 +0100
        Re: [rfc patch v4.4-rt2] sched: fix up preempt lazy forward port Grygorii Strashko <grygorii.strashko@ti.com> - 2016-01-22 13:30 +0100
          Re: [rfc patch v4.4-rt2] sched: fix up preempt lazy forward port Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-01-22 14:20 +0100
            Re: [rfc patch v4.4-rt2] sched: fix up preempt lazy forward port Grygorii Strashko <grygorii.strashko@ti.com> - 2016-01-22 14:40 +0100
              Re: [rfc patch v4.4-rt2] sched: fix up preempt lazy forward port Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-01-22 15:20 +0100
                Re: [rfc patch v4.4-rt2] sched: fix up preempt lazy forward port Grygorii Strashko <grygorii.strashko@ti.com> - 2016-01-22 16:10 +0100
                Re: [rfc patch v4.4-rt2] sched: fix up preempt lazy forward port Grygorii Strashko <grygorii.strashko@ti.com> - 2016-01-22 19:30 +0100
    Re: [rfc patch v4.4-rt2] sched: fix up preempt lazy forward port Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-01-19 05:50 +0100
      Re: [rfc patch v4.4-rt2] sched: fix up preempt lazy forward port Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-01-19 06:20 +0100
    Re: [rfc patch v4.4-rt2] sched: fix up preempt lazy forward port Grygorii Strashko <grygorii.strashko@ti.com> - 2016-01-22 13:00 +0100
      Re: [rfc patch v4.4-rt2] sched: fix up preempt lazy forward port Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-01-22 14:00 +0100
        Re: [rfc patch v4.4-rt2] sched: fix up preempt lazy forward port Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-01-22 21:50 +0100
          Re: [rfc patch v4.4-rt2] sched: fix up preempt lazy forward port Grygorii Strashko <grygorii.strashko@ti.com> - 2016-01-25 18:20 +0100

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