Re: [RFC PATCH v2 2/2] locking/percpu-rwsem: Mark rwsem as non-spinnable in percpu_rwsem_release()

[Waiman Long]

On 05/15/2018 01:42 AM, Amir Goldstein wrote:
> On Mon, May 14, 2018 at 10:31 PM, Waiman Long <longman@xxxxxxxxxx> wrote:
>> The percpu_rwsem_release() is called when the ownership of the embedded
>> rwsem is to be transferred to another task. The new owner, however, may
>> take a while to get the ownership of the lock via percpu_rwsem_acquire().
>> During that period, the rwsem is now marked as writer-owned with no
>> optimistic spinning.
>>
> Waiman,
>
> Thanks for the fix. I will test it soon.
>
> For this commit message I suggest that you add parts of the reproducer
> found here:
> https://marc.info/?l=linux-fsdevel&m=152622016219975&w=2
>
> Thanks,
> Amir.
Sure. I will add that to the commit log.

Cheers,
Longman