--- old/src/hotspot/share/runtime/serviceThread.cpp	2019-07-11 14:36:35.000000000 -0400
+++ new/src/hotspot/share/runtime/serviceThread.cpp	2019-07-11 14:36:35.000000000 -0400
@@ -202,7 +202,12 @@
       if (count > 0) {
         log_debug(monitorinflation)("requesting async deflation of idle monitors for %d thread(s).", count);
       }
-      ObjectSynchronizer::set_is_async_deflation_requested(false);  // async deflation has been requested
+      // The ServiceThread's async deflation request has been processed.
+      ObjectSynchronizer::set_is_async_deflation_requested(false);
+
+      // The global in-use list was handled above, but the request won't
+      // be complete until the JavaThreads have handled their in-use
+      // lists. This is the nature of an async deflation request.
     }
   }
 }