--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/gc/shared/workerDataArray.hpp	Thu Aug 10 18:09:19 2017 -0700
@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) 2015, 2017, 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_VM_GC_SHARED_WORKERDATAARRAY_HPP
+#define SHARE_VM_GC_SHARED_WORKERDATAARRAY_HPP
+
+#include "memory/allocation.hpp"
+#include "utilities/debug.hpp"
+
+class outputStream;
+
+template <class T>
+class WorkerDataArray  : public CHeapObj<mtGC> {
+  friend class WDAPrinter;
+public:
+  static const uint MaxThreadWorkItems = 3;
+private:
+  T*          _data;
+  uint        _length;
+  const char* _title;
+
+  WorkerDataArray<size_t>* _thread_work_items[MaxThreadWorkItems];
+
+ public:
+  WorkerDataArray(uint length, const char* title);
+  ~WorkerDataArray();
+
+  void link_thread_work_items(WorkerDataArray<size_t>* thread_work_items, uint index = 0);
+  void set_thread_work_item(uint worker_i, size_t value, uint index = 0);
+  void add_thread_work_item(uint worker_i, size_t value, uint index = 0);
+  WorkerDataArray<size_t>* thread_work_items(uint index = 0) const {
+    assert(index < MaxThreadWorkItems, "Tried to access thread work item %u max %u", index, MaxThreadWorkItems);
+    return _thread_work_items[index];
+  }
+
+  static T uninitialized();
+
+  void set(uint worker_i, T value);
+  T get(uint worker_i) const;
+
+  void add(uint worker_i, T value);
+
+  // The sum() and average() methods below consider uninitialized slots to be 0.
+  double average() const;
+  T sum() const;
+
+  const char* title() const {
+    return _title;
+  }
+
+  void reset();
+  void set_all(T value);
+
+
+ private:
+  class WDAPrinter {
+  public:
+    static void summary(outputStream* out, double min, double avg, double max, double diff, double sum, bool print_sum);
+    static void summary(outputStream* out, size_t min, double avg, size_t max, size_t diff, size_t sum, bool print_sum);
+
+    static void details(const WorkerDataArray<double>* phase, outputStream* out);
+    static void details(const WorkerDataArray<size_t>* phase, outputStream* out);
+  };
+
+ public:
+  void print_summary_on(outputStream* out, bool print_sum = true) const;
+  void print_details_on(outputStream* out) const;
+};
+
+#endif // SHARE_VM_GC_SHARED_WORKERDATAARRAY_HPP