--- /dev/null	2018-11-30 10:10:44.238550338 +0100
+++ new/src/hotspot/share/gc/shenandoah/shenandoahAllocTracker.hpp	2018-11-30 10:22:40.344476697 +0100
@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2017, 2018, Red Hat, Inc. All rights reserved.
+ *
+ * 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_GC_SHENANDOAH_SHENANDOAHALLOCTRACKER_HPP
+#define SHARE_VM_GC_SHENANDOAH_SHENANDOAHALLOCTRACKER_HPP
+
+#include "gc/shenandoah/shenandoahAllocRequest.hpp"
+#include "gc/shenandoah/shenandoahNumberSeq.hpp"
+#include "memory/allocation.hpp"
+#include "utilities/ostream.hpp"
+
+class ShenandoahAllocTracker : public CHeapObj<mtGC> {
+private:
+  BinaryMagnitudeSeq _alloc_size[ShenandoahAllocRequest::_ALLOC_LIMIT];
+  BinaryMagnitudeSeq _alloc_latency[ShenandoahAllocRequest::_ALLOC_LIMIT];
+
+public:
+  void record_alloc_latency(size_t words_size,
+                            ShenandoahAllocRequest::Type _alloc_type,
+                            double latency_us) {
+    _alloc_size[_alloc_type].add(words_size);
+    _alloc_latency[_alloc_type].add((size_t)latency_us);
+  }
+
+  void print_on(outputStream* out) const;
+};
+
+#endif // SHARE_VM_GC_SHENANDOAH_SHENANDOAHALLOCTRACKER_HPP