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epoll: use refcount to reduce ep_mutex contention

Carlos Maiolino requested to merge cmaiolino/centos-stream-9:el9_bz2044953 into main

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2044953 Tested: Regression test with xfstests

Backport the eventpoll optimization achieved by using a refcount and a couple of extra patches as dependencies.

Signed-off-by: Carlos Maiolino cmaiolino@redhat.com

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