--- /dev/null	2019-02-13 16:01:02.292000000 +0300
+++ new/src/share/vm/jfr/support/jfrFlush.hpp	2019-02-15 19:03:27.037103495 +0300
@@ -0,0 +1,77 @@
+/*
+ * Copyright (c) 2016, 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.
+ *
+ */
+
+#ifndef SHARE_VM_JFR_SUPPORT_JFRFLUSH_HPP
+#define SHARE_VM_JFR_SUPPORT_JFRFLUSH_HPP
+
+#include "jfr/recorder/storage/jfrBuffer.hpp"
+#include "jfr/utilities/jfrTypes.hpp"
+#include "memory/allocation.hpp"
+
+class Thread;
+
+class JfrFlush : public StackObj {
+ public:
+  typedef JfrBuffer Type;
+  JfrFlush(Type* old, size_t used, size_t requested, Thread* t);
+  Type* result() const { return _result; }
+ private:
+  Type* _result;
+};
+
+void jfr_conditional_flush(JfrEventId id, size_t size, Thread* t);
+bool jfr_is_event_enabled(JfrEventId id);
+bool jfr_has_stacktrace_enabled(JfrEventId id);
+bool jfr_save_stacktrace(Thread* t);
+void jfr_clear_stacktrace(Thread* t);
+
+template <typename Event>
+class JfrConditionalFlush {
+ public:
+  typedef JfrBuffer Type;
+  JfrConditionalFlush(Thread* t) {
+    if (jfr_is_event_enabled(Event::eventId)) {
+      jfr_conditional_flush(Event::eventId, sizeof(Event), t);
+    }
+  }
+};
+
+template <typename Event>
+class JfrConditionalFlushWithStacktrace : public JfrConditionalFlush<Event> {
+  Thread* _t;
+  bool _owner;
+ public:
+  JfrConditionalFlushWithStacktrace(Thread* t) : JfrConditionalFlush<Event>(t), _t(t), _owner(false) {
+    if (Event::has_stacktrace() && jfr_has_stacktrace_enabled(Event::eventId)) {
+      _owner = jfr_save_stacktrace(t);
+    }
+  }
+  ~JfrConditionalFlushWithStacktrace() {
+    if (_owner) {
+      jfr_clear_stacktrace(_t);
+    }
+  }
+};
+
+#endif // SHARE_VM_JFR_SUPPORT_JFRFLUSH_HPP