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

[Davidlohr Bueso]

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