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

[huang ying]

On Sat, Jan 30, 2016 at 9:18 AM, Ding Tianhong <dingtianhong@xxxxxxxxxx> 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