--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/jfr/recorder/storage/jfrStorageControl.hpp	Tue May 15 20:24:34 2018 +0200
@@ -0,0 +1,68 @@
+/*
+ * 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.
+ *
+ */
+
+#ifndef SHARE_VM_JFR_RECORDER_STORAGE_JFRSTORAGECONTROL_HPP
+#define SHARE_VM_JFR_RECORDER_STORAGE_JFRSTORAGECONTROL_HPP
+
+#include "jfr/utilities/jfrAllocation.hpp"
+
+class JfrStorageControl : public JfrCHeapObj {
+ private:
+  size_t _global_count_total;
+  size_t _full_count;
+  volatile size_t _global_lease_count;
+  volatile size_t _dead_count;
+  size_t _to_disk_threshold;
+  size_t _in_memory_discard_threshold;
+  size_t _global_lease_threshold;
+  size_t _scavenge_threshold;
+  bool _to_disk;
+
+ public:
+  JfrStorageControl(size_t global_count_total, size_t in_memory_discard_threshold);
+
+  void set_to_disk(bool enable);
+  bool to_disk() const;
+
+  size_t full_count() const;
+  size_t increment_full();
+  size_t decrement_full();
+  void   reset_full();
+  bool should_post_buffer_full_message() const;
+  bool should_discard() const;
+
+  size_t global_lease_count() const;
+  size_t increment_leased();
+  size_t decrement_leased();
+  bool is_global_lease_allowed() const;
+
+  size_t dead_count() const;
+  size_t increment_dead();
+  size_t decrement_dead();
+
+  void set_scavenge_threshold(size_t number_of_dead_buffers);
+  bool should_scavenge() const;
+};
+
+#endif // SHARE_VM_JFR_RECORDER_STORAGE_JFRSTORAGECONTROL_HPP