Re: [PATCH] locking/mutex: Avoid spinner vs waiter starvation

From	Davidlohr Bueso <dave@stgolabs.net>
Newsgroups	linux.kernel
Subject	Re: [PATCH] locking/mutex: Avoid spinner vs waiter starvation
Date	2016-02-03 20:30 +0100
Message-ID	<qYbhM-67g-3@gated-at.bofh.it> (permalink)
References	(5 earlier) <qWe0r-OA-19@gated-at.bofh.it> <qWsmK-3ln-5@gated-at.bofh.it> <qXjAL-11X-7@gated-at.bofh.it> <qXQwG-BS-11@gated-at.bofh.it> <qXZTk-7cx-11@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Wed, 03 Feb 2016, Ding Tianhong wrote:

>Agree, but this patch is going to help the waiter in the wait list to get the lock, your scene probability looks more
>too low and I don't think it is a problem.

Sure, I was in fact implying its not the end of the world,
although it will be interesting to see the impact on different
(non pathological) workloads, even if it only affects a single
waiter. Also, technically this issue can also affect rwsems if
only using writers, but that's obviously pretty idiotic, so I
wouldn't worry about it.

Thanks,
Davidlohr

Thread

Re: [PATCH RFC] locking/mutexes: don't spin on owner when wait list  is not NULL. Peter Zijlstra <peterz@infradead.org> - 2016-01-29 11:00 +0100
  Re: [PATCH RFC] locking/mutexes: don't spin on owner when wait list  is not NULL. Ding Tianhong <dingtianhong@huawei.com> - 2016-01-30 02:20 +0100
    Re: [PATCH RFC] locking/mutexes: don't spin on owner when wait list  is not NULL. huang ying <huang.ying.caritas@gmail.com> - 2016-02-01 04:30 +0100
      Re: [PATCH RFC] locking/mutexes: don't spin on owner when wait list is not NULL. "Huang\, Ying" <ying.huang@intel.com> - 2016-02-01 04:40 +0100
    [PATCH] locking/mutex: Avoid spinner vs waiter starvation Peter Zijlstra <peterz@infradead.org> - 2016-02-01 11:10 +0100
      Re: [PATCH] locking/mutex: Avoid spinner vs waiter starvation Davidlohr Bueso <dave@stgolabs.net> - 2016-02-02 22:20 +0100
        Re: [PATCH] locking/mutex: Avoid spinner vs waiter starvation Ding Tianhong <dingtianhong@huawei.com> - 2016-02-03 08:20 +0100
          Re: [PATCH] locking/mutex: Avoid spinner vs waiter starvation Davidlohr Bueso <dave@stgolabs.net> - 2016-02-03 20:30 +0100
            Re: [PATCH] locking/mutex: Avoid spinner vs waiter starvation Ding Tianhong <dingtianhong@huawei.com> - 2016-02-04 02:30 +0100
        Re: [PATCH] locking/mutex: Avoid spinner vs waiter starvation Waiman Long <waiman.long@hpe.com> - 2016-02-03 23:10 +0100
      Re: [PATCH] locking/mutex: Avoid spinner vs waiter starvation Jason Low <jason.low2@hp.com> - 2016-02-04 02:40 +0100
        Re: [PATCH] locking/mutex: Avoid spinner vs waiter starvation huang ying <huang.ying.caritas@gmail.com> - 2016-02-04 10:00 +0100
          Re: [PATCH] locking/mutex: Avoid spinner vs waiter starvation Jason Low <jason.low2@hp.com> - 2016-02-05 00:00 +0100

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