--- a/src/hotspot/share/runtime/globals.hpp	Tue Sep 25 11:24:59 2018 +0800
+++ b/src/hotspot/share/runtime/globals.hpp	Mon Sep 24 22:12:07 2018 -0700
@@ -827,9 +827,6 @@
           "Use LWP-based instead of libthread-based synchronization "       \
           "(SPARC only)")                                                   \
                                                                             \
-  experimental(ccstr, SyncKnobs, NULL,                                      \
-               "(Unstable) Various monitor synchronization tunables")       \
-                                                                            \
   product(intx, MonitorBound, 0, "Bound Monitor population")                \
           range(0, max_jint)                                                \
                                                                             \