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

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