Revert "Revert "Revert "Revert "issue-491: Significant performance improvement for spin lock contention""""
Revert "Revert "Revert "Revert "issue-491: Significant performance improvement for spin lock contention""""

This reverts commit 9c1545b5fd383e2b996bc7a7e5f0ef2f07b47697.

eixie/gperftools,eixie/gperftools,eixie/gperftools,eixie/gperftools