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

[Roman Penyaev]

On 2018-12-06 04:08, Davidlohr Bueso wrote:
> > 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.

Yes, should not be a part of this RFC.  Thanks.

--
Roman