--- /dev/null	2020-09-04 12:37:41.765504620 +0200
+++ new/src/hotspot/share/memory/metaspace/msChunkHeaderPool.cpp	2020-09-04 13:57:43.185302947 +0200
@@ -0,0 +1,91 @@
+/*
+ * 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/msChunkHeaderPool.hpp"
+#include "runtime/os.hpp"
+#include "utilities/debug.hpp"
+#include "utilities/globalDefinitions.hpp"
+
+namespace metaspace {
+
+// Returns reference to the one global chunk header pool.
+ChunkHeaderPool* ChunkHeaderPool::_chunkHeaderPool = NULL;
+
+ChunkHeaderPool::ChunkHeaderPool()
+  : _num_slabs(), _first_slab(NULL), _current_slab(NULL)
+{
+}
+
+// Note: the global chunk header pool gets never deleted; so this destructor only
+// exists for the sake of tests.
+ChunkHeaderPool::~ChunkHeaderPool() {
+  Slab* s = _first_slab;
+  while (s != NULL) {
+    Slab* next_slab = s->_next;
+    os::free(s);
+     s = next_slab;
+  }
+}
+
+void ChunkHeaderPool::allocate_new_slab() {
+  Slab* slab = new Slab();
+  if (_current_slab != NULL) {
+    _current_slab->_next = slab;
+  }
+  _current_slab = slab;
+  if (_first_slab == NULL) {
+    _first_slab = slab;
+  }
+  _num_slabs.increment();
+}
+
+// Returns size of memory used.
+size_t ChunkHeaderPool::memory_footprint_words() const {
+  return (_num_slabs.get() * sizeof(Slab)) / BytesPerWord;
+}
+
+void ChunkHeaderPool::initialize() {
+  assert(_chunkHeaderPool == NULL, "only once");
+  _chunkHeaderPool = new ChunkHeaderPool();
+}
+
+#ifdef ASSERT
+void ChunkHeaderPool::verify() const {
+  const Slab* s = _first_slab;
+  int num = 0;
+  while (s != NULL) {
+    assert(s->_top >= 0 && s->_top <= SlabCapacity,
+           "invalid slab at " PTR_FORMAT ", top: %d, slab cap: %d",
+           p2i(s), s->_top, SlabCapacity );
+    s = s->_next;
+    num++;
+  }
+  _num_slabs.check(num);
+}
+#endif
+
+} // namespace metaspace
+