diff -r c7a3e57fdf4a -r b985cbb00e68 src/share/vm/runtime/synchronizer.cpp
--- a/src/share/vm/runtime/synchronizer.cpp	Thu Aug 01 03:44:03 2019 +0100
+++ b/src/share/vm/runtime/synchronizer.cpp	Mon Aug 12 18:30:40 2019 +0300
@@ -24,6 +24,7 @@
 
 #include "precompiled.hpp"
 #include "classfile/vmSymbols.hpp"
+#include "jfr/jfrEvents.hpp"
 #include "memory/resourceArea.hpp"
 #include "oops/markOop.hpp"
 #include "oops/oop.inline.hpp"
@@ -1178,6 +1179,17 @@
     TEVENT (omFlush) ;
 }
 
+static void post_monitor_inflate_event(EventJavaMonitorInflate* event,
+                                       const oop obj) {
+  assert(event != NULL, "invariant");
+  assert(event->should_commit(), "invariant");
+  event->set_monitorClass(obj->klass());
+  event->set_address((uintptr_t)(void*)obj);
+  // XXX no such counters. implement?
+//  event->set_cause((u1)cause);
+  event->commit();
+}
+
 // Fast path code shared by multiple functions
 ObjectMonitor* ObjectSynchronizer::inflate_helper(oop obj) {
   markOop mark = obj->mark();
@@ -1200,6 +1212,8 @@
   assert (Universe::verify_in_progress() ||
           !SafepointSynchronize::is_at_safepoint(), "invariant") ;
 
+  EventJavaMonitorInflate event;
+
   for (;;) {
       const markOop mark = object->mark() ;
       assert (!mark->has_bias_pattern(), "invariant") ;
@@ -1330,6 +1344,9 @@
                 object->klass()->external_name());
             }
           }
+          if (event.should_commit()) {
+            post_monitor_inflate_event(&event, object);
+          }
           return m ;
       }
 
@@ -1380,6 +1397,9 @@
             object->klass()->external_name());
         }
       }
+      if (event.should_commit()) {
+        post_monitor_inflate_event(&event, object);
+      }
       return m ;
   }
 }