--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/memory/metaspace/metaspaceReport.hpp	Tue Sep 10 09:24:05 2019 +0200
@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2018, 2019 SAP and/or its affiliates.
+ * Copyright (c) 2018, 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.
+ *
+ */
+
+#ifndef SHARE_MEMORY_METASPACE_METASPACEREPORT_HPP
+#define SHARE_MEMORY_METASPACE_METASPACEREPORT_HPP
+
+#include "memory/allocation.hpp"
+
+namespace metaspace {
+
+class MetaspaceReporter : public AllStatic {
+public:
+
+  // Flags for print_report().
+  enum ReportFlag {
+    // Show usage by class loader.
+    rf_show_loaders                 = (1 << 0),
+    // Breaks report down by chunk type (small, medium, ...).
+    rf_break_down_by_chunktype      = (1 << 1),
+    // Breaks report down by space type (anonymous, reflection, ...).
+    rf_break_down_by_spacetype      = (1 << 2),
+    // Print details about the underlying virtual spaces.
+    rf_show_vslist                  = (1 << 3),
+    // Print metaspace map.
+    rf_show_vsmap                   = (1 << 4),
+    // If show_loaders: show loaded classes for each loader.
+    rf_show_classes                 = (1 << 5)
+  };
+
+  // This will print out a basic metaspace usage report but
+  // unlike print_report() is guaranteed not to lock or to walk the CLDG.
+  static void print_basic_report(outputStream* st, size_t scale);
+
+  // Prints a report about the current metaspace state.
+  // Optional parts can be enabled via flags.
+  // Function will walk the CLDG and will lock the expand lock; if that is not
+  // convenient, use print_basic_report() instead.
+  static void print_report(outputStream* out, size_t scale = 0, int flags = 0);
+
+};
+
+} // namespace metaspace
+
+#endif // SHARE_MEMORY_METASPACE_METASPACEREPORT_HPP