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

From: Roman Penyaev
Date: Thu Dec 06 2018 - 05:27:41 EST


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