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

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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




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