[Performance] Reduce Context Switching#2065

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rrb3942:reduced_context_switching

Commits on Nov 17, 2022

Enables the use of EPOLLEXCLUSIVE for UDP workers where supported.
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This change causes epoll_wait to only return events for a single FD on everycall.
rrb3942
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Optimize IO handling by draining FDs on every wake-up.
rrb3942
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