--- old/src/hotspot/share/gc/shenandoah/shenandoahArguments.cpp	2019-05-13 10:47:12.084174561 -0400
+++ new/src/hotspot/share/gc/shenandoah/shenandoahArguments.cpp	2019-05-13 10:47:11.698173850 -0400
@@ -183,6 +183,10 @@
   }
 #endif
 
+  if (strcmp(ShenandoahGCHeuristics, "traversal") == 0) {
+    FLAG_SET_DEFAULT(ShenandoahConcurrentScanCodeRoots, false);
+  }
+
   // Make sure safepoint deadlocks are failing predictably. This sets up VM to report
   // fatal error after 10 seconds of wait for safepoint syncronization (not the VM
   // operation itself). There is no good reason why Shenandoah would spend that