Re: [PATCH-tip v3 11/11] locking/rwsem: Optimize rwsem structure for uncontended lock acquisition

[Peter Zijlstra]

On Thu, Feb 28, 2019 at 02:09:41PM -0500, Waiman Long wrote:
> For an uncontended rwsem, count and owner are the only fields a task
> needs to touch when acquiring the rwsem. So they are put next to each
> other to increase the chance that they will share the same cacheline.

Did you try and micro-bench this?