--- /dev/null	2020-09-04 12:37:41.765504620 +0200
+++ new/src/hotspot/share/memory/metaspace/msCommitLimiter.cpp	2020-09-04 13:57:47.353330855 +0200
@@ -0,0 +1,62 @@
+/*
+ * Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2020 SAP SE. 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.
+ *
+ */
+
+#include "precompiled.hpp"
+
+#include "memory/metaspace/msCommitLimiter.hpp"
+#include "memory/metaspace.hpp"
+#include "utilities/debug.hpp"
+#include "utilities/globalDefinitions.hpp"
+
+namespace metaspace {
+
+// Returns the size, in words, by which we may expand the metaspace committed area without:
+// - _cap == 0: hitting GC threshold or the MaxMetaspaceSize
+// - _cap > 0: hitting cap (this is just for testing purposes)
+size_t CommitLimiter::possible_expansion_words() const {
+
+  if (_cap > 0) { // Testing.
+    assert(_cnt.get() <= _cap, "Beyond limit?");
+    return _cap - _cnt.get();
+  }
+
+  assert(_cnt.get() * BytesPerWord <= MaxMetaspaceSize, "Beyond limit?");
+  const size_t words_left_below_max = MaxMetaspaceSize / BytesPerWord - _cnt.get();
+
+  const size_t words_left_below_gc_threshold = MetaspaceGC::allowed_expansion();
+
+  return MIN2(words_left_below_max, words_left_below_gc_threshold);
+
+}
+
+static CommitLimiter g_global_limiter(0);
+
+// Returns the global metaspace commit counter
+CommitLimiter* CommitLimiter::globalLimiter() {
+  return &g_global_limiter;
+}
+
+} // namespace metaspace
+