Re: [RFC] locking/rwsem: Avoid issuing wakeup before setting the reader waiter to nil

Davidlohr Bueso
2018-11-29T18:17:27Z

On Thu, 29 Nov 2018, Peter Zijlstra wrote:

>On Thu, Nov 29, 2018 at 12:58:26PM -0500, Waiman Long wrote:
>> OK, you convinced me. However, that can still lead to anonymous wakeups
>> that can be problematic if it happens in certain places. Should we try
>> to reduce anonymous wakeup as much as possible?
>
>No, we should at all times accept and expect spurious wakeups.

Right, when this was merged, spurious wakeups were acknowledged as quite
possible.