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Re: [PATCH -v2 1/9] rtmutex: Deboost before waking up the top waiter

From Peter Zijlstra <peterz@infradead.org>
Newsgroups linux.kernel
Subject Re: [PATCH -v2 1/9] rtmutex: Deboost before waking up the top waiter
Date 2016-09-26 17:50 +0200
Message-ID <slGki-5BO-19@gated-at.bofh.it> (permalink)
References (1 earlier) <slDw5-3SS-1@gated-at.bofh.it> <slFRg-5rZ-29@gated-at.bofh.it> <slG0W-5v6-11@gated-at.bofh.it> <slGaC-5yk-17@gated-at.bofh.it> <slGaC-5yk-27@gated-at.bofh.it>
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On Mon, Sep 26, 2016 at 11:37:27AM -0400, Steven Rostedt wrote:
> On Mon, 26 Sep 2016 11:35:03 -0400
> Steven Rostedt <rostedt@goodmis.org> wrote:
> 
> > Especially now that the code after the spin_unlock(&hb->lock) is now a
> > critical section (preemption is disable). There's nothing obvious in
> > futex.c that says it is.
> 
> Not to mention, this looks like it will break PREEMPT_RT as wake_up_q()
> calls sleepable spin locks.

What locks would that be?

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[PATCH -v2 1/9] rtmutex: Deboost before waking up the top waiter Peter Zijlstra <peterz@infradead.org> - 2016-09-26 14:50 +0200
  Re: [PATCH -v2 1/9] rtmutex: Deboost before waking up the top  waiter Steven Rostedt <rostedt@goodmis.org> - 2016-09-26 17:20 +0200
    Re: [PATCH -v2 1/9] rtmutex: Deboost before waking up the top waiter Peter Zijlstra <peterz@infradead.org> - 2016-09-26 17:30 +0200
      Re: [PATCH -v2 1/9] rtmutex: Deboost before waking up the top  waiter Steven Rostedt <rostedt@goodmis.org> - 2016-09-26 17:40 +0200
        Re: [PATCH -v2 1/9] rtmutex: Deboost before waking up the top  waiter Steven Rostedt <rostedt@goodmis.org> - 2016-09-26 17:40 +0200
          Re: [PATCH -v2 1/9] rtmutex: Deboost before waking up the top waiter Peter Zijlstra <peterz@infradead.org> - 2016-09-26 17:50 +0200
            Re: [PATCH -v2 1/9] rtmutex: Deboost before waking up the top  waiter Thomas Gleixner <tglx@linutronix.de> - 2016-09-29 16:50 +0200
              Re: [PATCH -v2 1/9] rtmutex: Deboost before waking up the top waiter Peter Zijlstra <peterz@infradead.org> - 2016-09-29 17:00 +0200
        Re: [PATCH -v2 1/9] rtmutex: Deboost before waking up the top waiter Peter Zijlstra <peterz@infradead.org> - 2016-09-26 17:50 +0200
  Re: [PATCH -v2 1/9] rtmutex: Deboost before waking up the top waiter Peter Zijlstra <peterz@infradead.org> - 2016-09-28 11:30 +0200
  Re: [PATCH -v2 1/9] rtmutex: Deboost before waking up the top waiter Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-09-28 11:40 +0200

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