--- /dev/null	2019-01-28 17:46:36.000000000 +0800
+++ new/src/share/vm/jfr/periodic/jfrThreadDumpEvent.cpp	2019-01-28 17:46:36.000000000 +0800
@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 2015, 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
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#include "precompiled.hpp"
+#include "jfr/dcmd/jfrDcmds.hpp"
+#include "jfr/periodic/jfrThreadDumpEvent.hpp"
+#include "jfr/utilities/jfrLog.hpp"
+#include "tracefiles/traceEventClasses.hpp"
+#include "utilities/exceptions.hpp"
+#include "utilities/ostream.hpp"
+
+/**
+*  Worker impl for generating and writing dcmd commands
+*  as jfr events.
+*  dispatch to diagnosticcommands "parse_and_execute"
+*
+*  param: cmd = the DCMD to execute (including options)
+*/
+static bool execute_dcmd(bufferedStream& st, const char* const cmd) {
+  Thread* THREAD = Thread::current();
+  assert(!HAS_PENDING_EXCEPTION, "dcmd does not expect pending exceptions on entry!");
+  // delegate to DCmd execution
+  DCmd::parse_and_execute(DCmd_Source_Internal, &st, cmd, ' ', THREAD);
+  if (HAS_PENDING_EXCEPTION) {
+    log_debug(jfr, system)("unable to create jfr event for DCMD %s", cmd);
+    log_debug(jfr, system)("exception type: %s", PENDING_EXCEPTION->klass()->external_name());
+    // don't unwind this exception
+    CLEAR_PENDING_EXCEPTION;
+    // if exception occurred,
+    // reset stream.
+    st.reset();
+    return false;
+  }
+  return true;
+}
+
+// caller needs ResourceMark
+const char* JfrDcmdEvent::thread_dump() {
+  assert(EventThreadDump::is_enabled(), "invariant");
+  bufferedStream st;
+  execute_dcmd(st, "Thread.print");
+  return st.as_string();
+}