--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/memory/metaspace/runningCounters.hpp	Tue Sep 10 09:24:05 2019 +0200
@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) 2019 SAP SE. All rights reserved.
+ * Copyright (c) 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_RUNNINGCOUNTERS_HPP
+#define SHARE_MEMORY_METASPACE_RUNNINGCOUNTERS_HPP
+
+#include "memory/allocation.hpp"
+#include "memory/metaspace/counter.hpp"
+
+namespace metaspace {
+
+class ClassLoaderMetaspace;
+
+// These are running counters for some basic Metaspace statistics.
+// Their value can be obtained quickly without locking.
+
+class RunningCounters : public AllStatic {
+
+  friend class ClassLoaderMetaspace;
+
+  // ---- in-use chunks ----
+
+  // Used space, in words.
+  // (Note that the used counter is on the hot path of Metaspace allocation.
+  //  Do we really need it? We may get by with capacity only and get more details
+  //  with get_statistics_slow().)
+  static SizeAtomicCounter _used_class_counter;
+  static SizeAtomicCounter _used_nonclass_counter;
+
+public:
+
+  // ---- virtual memory -----
+
+  // Return reserved size, in words, for Metaspace
+  static size_t reserved_words();
+  static size_t reserved_words_class();
+  static size_t reserved_words_nonclass();
+
+  // Return total committed size, in words, for Metaspace
+  static size_t committed_words();
+  static size_t committed_words_class();
+  static size_t committed_words_nonclass();
+
+
+  // ---- used chunks -----
+
+  // Returns size, in words, used for metadata.
+  static size_t used_words();
+  static size_t used_words_class();
+  static size_t used_words_nonclass();
+
+  // ---- free chunks -----
+
+  // Returns size, in words, of all chunks in all freelists.
+  static size_t free_chunks_words();
+  static size_t free_chunks_words_class();
+  static size_t free_chunks_words_nonclass();
+
+  // Direct access to the counters.
+  static SizeAtomicCounter* used_nonclass_counter()     { return &_used_nonclass_counter; }
+  static SizeAtomicCounter* used_class_counter()        { return &_used_class_counter; }
+
+};
+
+} // namespace metaspace
+
+#endif // SHARE_MEMORY_METASPACE_RUNNINGCOUNTERS_HPP
+
+