diff -r f3e0dee91918 -r cb24277be2e7 hotspot/src/cpu/ppc/vm/globalDefinitions_ppc.hpp
--- a/hotspot/src/cpu/ppc/vm/globalDefinitions_ppc.hpp	Fri Dec 11 09:08:08 2015 +0100
+++ b/hotspot/src/cpu/ppc/vm/globalDefinitions_ppc.hpp	Thu Dec 10 15:27:16 2015 +0100
@@ -36,4 +36,9 @@
 // The PPC CPUs are NOT multiple-copy-atomic.
 #define CPU_NOT_MULTIPLE_COPY_ATOMIC
 
+#if defined(COMPILER2) && defined(AIX)
+// Include Transactional Memory lock eliding optimization
+#define INCLUDE_RTM_OPT 1
+#endif
+
 #endif // CPU_PPC_VM_GLOBALDEFINITIONS_PPC_HPP