--- old/src/hotspot/share/runtime/safepoint.cpp	2019-04-18 22:07:25.364306975 -0400
+++ new/src/hotspot/share/runtime/safepoint.cpp	2019-04-18 22:07:24.620306988 -0400
@@ -525,6 +525,10 @@
     _counters(counters) {}
 
   void do_thread(Thread* thread) {
+    // deflate_thread_local_monitors() handles or requests deflation of
+    // this thread's idle monitors. If !AsyncDeflateIdleMonitors or if
+    // there is a special cleanup request, deflation is handled now.
+    // Otherwise, async deflation is requested via a flag.
     ObjectSynchronizer::deflate_thread_local_monitors(thread, _counters);
     if (_nmethod_cl != NULL && thread->is_Java_thread() &&
         ! thread->is_Code_cache_sweeper_thread()) {
@@ -561,7 +565,7 @@
       // when a special cleanup has been requested.
       // Note: This logging output will include global idle monitor
       // elapsed times, but not global idle monitor deflation count.
-      ObjectSynchronizer::do_safepoint_work(!AsyncDeflateIdleMonitors ? _counters : NULL);
+      ObjectSynchronizer::do_safepoint_work(_counters);
 
       post_safepoint_cleanup_task_event(event, safepoint_id, name);
     }