--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/jfr/recorder/repository/jfrChunkSizeNotifier.cpp	Tue May 15 20:24:34 2018 +0200
@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 2012, 2018, 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/jni/jfrJavaSupport.hpp"
+#include "jfr/recorder/repository/jfrChunkWriter.hpp"
+#include "jfr/recorder/repository/jfrChunkSizeNotifier.hpp"
+
+size_t JfrChunkSizeNotifier::_chunk_size_threshold = 0;
+
+void JfrChunkSizeNotifier::set_chunk_size_threshold(size_t bytes) {
+  _chunk_size_threshold = bytes;
+}
+
+size_t JfrChunkSizeNotifier::chunk_size_threshold() {
+  return _chunk_size_threshold;
+}
+
+static jobject new_chunk_monitor = NULL;
+
+// lazy install
+static jobject get_new_chunk_monitor(Thread* thread) {
+  static bool initialized = false;
+  if (initialized) {
+    assert(new_chunk_monitor != NULL, "invariant");
+    return new_chunk_monitor;
+  }
+  assert(new_chunk_monitor == NULL, "invariant");
+  // read static field
+  HandleMark hm(thread);
+  static const char klass[] = "jdk/jfr/internal/JVM";
+  static const char field[] = "FILE_DELTA_CHANGE";
+  static const char signature[] = "Ljava/lang/Object;";
+  JavaValue result(T_OBJECT);
+  JfrJavaArguments field_args(&result, klass, field, signature, thread);
+  JfrJavaSupport::get_field_global_ref(&field_args, thread);
+  new_chunk_monitor = result.get_jobject();
+  initialized = new_chunk_monitor != NULL;
+  return new_chunk_monitor;
+}
+
+void JfrChunkSizeNotifier::notify() {
+  Thread* const thread = Thread::current();
+  JfrJavaSupport::notify_all(get_new_chunk_monitor(thread), thread);
+}
+
+void JfrChunkSizeNotifier::release_monitor() {
+  if (new_chunk_monitor != NULL) {
+    JfrJavaSupport::destroy_global_jni_handle(new_chunk_monitor);
+    new_chunk_monitor = NULL;
+  }
+}