diff -r 13588c901957 -r 9cf78a70fa4f src/hotspot/share/jfr/support/jfrThreadLocal.cpp
--- a/src/hotspot/share/jfr/support/jfrThreadLocal.cpp	Thu Oct 17 20:27:44 2019 +0100
+++ b/src/hotspot/share/jfr/support/jfrThreadLocal.cpp	Thu Oct 17 20:53:35 2019 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2012, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2012, 2019, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -25,13 +25,13 @@
 #include "precompiled.hpp"
 #include "jfr/jfrEvents.hpp"
 #include "jfr/jni/jfrJavaSupport.hpp"
+#include "jfr/leakprofiler/checkpoint/objectSampleCheckpoint.hpp"
 #include "jfr/periodic/jfrThreadCPULoadEvent.hpp"
 #include "jfr/recorder/jfrRecorder.hpp"
 #include "jfr/recorder/checkpoint/jfrCheckpointManager.hpp"
 #include "jfr/recorder/checkpoint/types/traceid/jfrTraceId.inline.hpp"
 #include "jfr/recorder/service/jfrOptionSet.hpp"
 #include "jfr/recorder/storage/jfrStorage.hpp"
-#include "jfr/recorder/stacktrace/jfrStackTraceRepository.hpp"
 #include "jfr/support/jfrThreadLocal.hpp"
 #include "memory/allocation.inline.hpp"
 #include "runtime/os.hpp"
@@ -46,7 +46,7 @@
   _shelved_buffer(NULL),
   _stackframes(NULL),
   _trace_id(JfrTraceId::assign_thread_id()),
-  _thread_cp(),
+  _thread(),
   _data_lost(0),
   _stack_trace_id(max_julong),
   _user_time(0),
@@ -62,17 +62,17 @@
   return _data_lost;
 }
 
-bool JfrThreadLocal::has_thread_checkpoint() const {
-  return _thread_cp.valid();
+bool JfrThreadLocal::has_thread_blob() const {
+  return _thread.valid();
 }
 
-void JfrThreadLocal::set_thread_checkpoint(const JfrCheckpointBlobHandle& ref) {
-  assert(!_thread_cp.valid(), "invariant");
-  _thread_cp = ref;
+void JfrThreadLocal::set_thread_blob(const JfrBlobHandle& ref) {
+  assert(!_thread.valid(), "invariant");
+  _thread = ref;
 }
 
-const JfrCheckpointBlobHandle& JfrThreadLocal::thread_checkpoint() const {
-  return _thread_cp;
+const JfrBlobHandle& JfrThreadLocal::thread_blob() const {
+  return _thread;
 }
 
 static void send_java_thread_start_event(JavaThread* jt) {
@@ -95,10 +95,12 @@
   assert(jt != NULL, "invariant");
   assert(Thread::current() == jt, "invariant");
   assert(jt->jfr_thread_local()->trace_id() == id, "invariant");
-  EventThreadEnd event;
-  event.set_thread(id);
-  event.commit();
-  JfrThreadCPULoadEvent::send_event_for_thread(jt);
+  if (JfrRecorder::is_recording()) {
+    EventThreadEnd event;
+    event.set_thread(id);
+    event.commit();
+    JfrThreadCPULoadEvent::send_event_for_thread(jt);
+  }
 }
 
 void JfrThreadLocal::release(JfrThreadLocal* tl, Thread* t) {
@@ -117,9 +119,7 @@
     assert(t->is_Java_thread(), "invariant");
     JfrJavaSupport::destroy_global_jni_handle(tl->java_event_writer());
   }
-  if (tl->_stackframes != NULL) {
-    FREE_C_HEAP_ARRAY(JfrStackFrame, tl->_stackframes);
-  }
+  FREE_C_HEAP_ARRAY(JfrStackFrame, tl->_stackframes);
   tl->_dead = true;
 }
 
@@ -127,10 +127,10 @@
   assert(t != NULL, "invariant");
   JfrThreadLocal * const tl = t->jfr_thread_local();
   assert(!tl->is_dead(), "invariant");
-  if (JfrRecorder::is_recording()) {
-    if (t->is_Java_thread()) {
-      send_java_thread_end_events(tl->thread_id(), (JavaThread*)t);
-    }
+  if (t->is_Java_thread()) {
+    JavaThread* const jt = (JavaThread*)t;
+    ObjectSampleCheckpoint::on_thread_exit(jt);
+    send_java_thread_end_events(tl->thread_id(), jt);
   }
   release(tl, Thread::current()); // because it could be that Thread::current() != t
 }
@@ -150,9 +150,7 @@
 
 JfrStackFrame* JfrThreadLocal::install_stackframes() const {
   assert(_stackframes == NULL, "invariant");
-  _stackdepth = (u4)JfrOptionSet::stackdepth();
-  guarantee(_stackdepth > 0, "Stackdepth must be > 0");
-  _stackframes = NEW_C_HEAP_ARRAY(JfrStackFrame, _stackdepth, mtTracing);
+  _stackframes = NEW_C_HEAP_ARRAY(JfrStackFrame, stackdepth(), mtTracing);
   return _stackframes;
 }
 
@@ -163,3 +161,7 @@
 ByteSize JfrThreadLocal::java_event_writer_offset() {
   return in_ByteSize(offset_of(JfrThreadLocal, _java_event_writer));
 }
+
+u4 JfrThreadLocal::stackdepth() const {
+  return _stackdepth != 0 ? _stackdepth : (u4)JfrOptionSet::stackdepth();
+}