--- a/hotspot/src/share/vm/runtime/arguments.cpp	Fri Jan 08 09:42:31 2010 -0800
+++ b/hotspot/src/share/vm/runtime/arguments.cpp	Fri Jan 08 13:47:01 2010 -0800
@@ -2795,6 +2795,11 @@
   }
 #endif
 
+  if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
+    warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
+    DebugNonSafepoints = true;
+  }
+
   if (PrintCommandLineFlags) {
     CommandLineFlags::printSetFlags();
   }