Re: [PATCH RFC] locking/mutexes: don't spin on owner when wait list is not NULL.

From	huang ying <huang.ying.caritas@gmail.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH RFC] locking/mutexes: don't spin on owner when wait list is not NULL.
Date	2016-02-01 04:30 +0100
Message-ID	<qXdlD-4Sy-7@gated-at.bofh.it> (permalink)
References	(6 earlier) <qTHLj-3dT-1@gated-at.bofh.it> <qTKzw-560-21@gated-at.bofh.it> <qUnUd-1Ui-1@gated-at.bofh.it> <qWe0r-OA-19@gated-at.bofh.it> <qWsmK-3ln-5@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Sat, Jan 30, 2016 at 9:18 AM, Ding Tianhong <dingtianhong@huawei.com> wrote:
> On 2016/1/29 17:53, Peter Zijlstra wrote:
>> On Sun, Jan 24, 2016 at 04:03:50PM +0800, Ding Tianhong wrote:
>>
>>> looks good to me, I will try this solution and report the result, thanks everyone.
>>
>> Did you get a change to run with this?
>>
>> .
>>
>
> I backport this patch to 3.10 lts kernel, and didn't change any logic, Till now, the patch works fine to me, and no need to change anything,
> So I think this patch is no problem, could you formal release this patch to the latest kernel? :)
>
> Thanks.
> Ding
>
>

The original patch from Tianhong triggered a performance regression
because the optimistic spinning is turned off in effect.  I tested
Peter's patch with same configuration and there show no regression.
So I think the patch keep the optimistic spinning.  Test result
details will be in the next email.

Best Regards,
Huang, YIng

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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