Re: [RFC PATCH 1/1] epoll: use rwlock in order to reduce ep_poll_callback() contention

[Davidlohr Bueso <dave@xxxxxxxxxxxx>]

> On 12/3/18 6:02 AM, Roman Penyaev wrote:

> >  		if (!ep_is_linked(epi)) {
> > -			list_add_tail(&epi->rdllink, &ep->rdllist);
> > +			/* Reverse ->ovflist, events should be in FIFO */
> > +			list_add(&epi->rdllink, &ep->rdllist);
> >  			ep_pm_stay_awake(epi);
> >  		}

This should probably a separate patch as it fixes the ordering,
regardless of the rwlock+xchg optimization.

Thanks,
Davidlohr