event: Use skiplist and fold in performance tweeks from trunk trunk patch: http://svn.apache.org/viewvc?view=revision&revision=1451706 http://svn.apache.org/viewvc?view=revision&revision=1517365 http://svn.apache.org/viewvc?view=revision&revision=1529442 2.4.x patch: http://people.apache.org/~jim/patches/httpd-2.4-event-v3.patch Submitted by: jim Reviewed by: rjung, minfrin