Re: [PATCH] locking/osq: Drop the overload of osq lock

[panxinhui]

> 在 2016年6月26日，03:12，Peter Zijlstra <peterz@xxxxxxxxxxxxx> 写道：
> 
> On Sun, Jun 26, 2016 at 01:27:51AM +0800, panxinhui wrote:
> 
>> by the way I still think mutex_unlock has a big overload too. 
> 
> Do you mean overhead?
> 
oh, maybe you are right. 
mutex_unlock ’s implementation uses inc_return variant on  ppc, and that’s expensive. I am thinking of using  cmpxchg instead.