--- a/src/hotspot/share/gc/shenandoah/shenandoah_globals.hpp	Sat Jan 19 11:19:55 2019 +0100
+++ b/src/hotspot/share/gc/shenandoah/shenandoah_globals.hpp	Sat Jan 19 11:20:01 2019 +0100
@@ -185,6 +185,9 @@
           "adjustment. Lower values make adjustments faster, at the "       \
           "expense of higher perf overhead. Time is in milliseconds.")      \
                                                                             \
+  experimental(bool, ShenandoahCriticalControlThreadPriority, false,        \
+          "Shenandoah control thread runs at critical scheduling priority.")\
+                                                                            \
   diagnostic(bool, ShenandoahVerify, false,                                 \
           "Verify the Shenandoah garbage collector")                        \
                                                                             \