--- /dev/null	2017-11-09 09:38:01.297999907 +0100
+++ new/src/hotspot/share/jfr/periodic/jfrOSInterface.hpp	2018-04-09 14:50:30.432732607 +0200
@@ -0,0 +1,59 @@
+/*
+ * 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_PERIODIC_JFROSINTERFACE_HPP
+#define SHARE_VM_JFR_PERIODIC_JFROSINTERFACE_HPP
+
+#include "jfr/utilities/jfrAllocation.hpp"
+#include "utilities/globalDefinitions.hpp"
+
+class CPUInformation;
+class EnvironmentVariable;
+class SystemProcess;
+
+class JfrOSInterface: public JfrCHeapObj {
+  friend class JfrRecorder;
+ private:
+  class JfrOSInterfaceImpl;
+  JfrOSInterfaceImpl* _impl;
+
+  JfrOSInterface();
+  ~JfrOSInterface();
+  bool initialize();
+  static JfrOSInterface& instance();
+  static JfrOSInterface* create();
+  static void destroy();
+
+ public:
+  static int cpu_information(CPUInformation& cpu_info);
+  static int cpu_load(int which_logical_cpu, double* cpu_load);
+  static int context_switch_rate(double* rate);
+  static int cpu_load_total_process(double* cpu_load);
+  static int cpu_loads_process(double* pjvmUserLoad, double* pjvmKernelLoad, double* psystemTotalLoad);
+  static int os_version(char** os_version);
+  static int generate_initial_environment_variable_events();
+  static int system_processes(SystemProcess** system_processes, int* no_of_sys_processes);
+};
+
+#endif // SHARE_VM_JFR_PERIODIC_JFROSINTERFACE_HPP