Re: [PATCH 2/3] locking/percpu-rwsem: Replace bulky wait-queues with swait

[Davidlohr Bueso]

On Mon, 21 Nov 2016, Oleg Nesterov wrote:

> On 11/18, Davidlohr Bueso wrote:
> > @@ -12,7 +12,7 @@ struct percpu_rw_semaphore {
> >  	struct rcu_sync		rss;
> >  	unsigned int __percpu	*read_count;
> >  	struct rw_semaphore	rw_sem;
> > -	wait_queue_head_t	writer;
> > +	struct swait_queue_head	writer;
>
> I won't argue, but even swait_queue_head is overkill in this case.
>
> We can just add "struct task_struct *writer" into percpu_rw_semaphore,

Given that this is how all things locking/ work, I very much agree with
you, lemme send a v2.