--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/gc/shared/stringdedup/stringDedupStat.hpp	Thu Jun 14 09:59:21 2018 -0400
@@ -0,0 +1,139 @@
+/*
+ * Copyright (c) 2014, 2018, 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_STRINGDEDUP_STRINGDEDUPSTAT_HPP
+#define SHARE_VM_GC_SHARED_STRINGDEDUP_STRINGDEDUPSTAT_HPP
+
+#include "memory/allocation.hpp"
+#include "runtime/os.hpp"
+
+// Macros for GC log output formating
+#define STRDEDUP_OBJECTS_FORMAT         UINTX_FORMAT_W(12)
+#define STRDEDUP_TIME_FORMAT            "%.3fs"
+#define STRDEDUP_TIME_PARAM(time)       (time)
+#define STRDEDUP_TIME_FORMAT_MS         "%.3fms"
+#define STRDEDUP_TIME_PARAM_MS(time)    ((time) * MILLIUNITS)
+#define STRDEDUP_PERCENT_FORMAT         "%5.1f%%"
+#define STRDEDUP_PERCENT_FORMAT_NS      "%.1f%%"
+#define STRDEDUP_BYTES_FORMAT           "%8.1f%s"
+#define STRDEDUP_BYTES_FORMAT_NS        "%.1f%s"
+#define STRDEDUP_BYTES_PARAM(bytes)     byte_size_in_proper_unit((double)(bytes)), proper_unit_for_byte_size((bytes))
+
+//
+// Statistics gathered by the deduplication thread.
+//
+class StringDedupStat : public CHeapObj<mtGC> {
+protected:
+  // Counters
+  uintx  _inspected;
+  uintx  _skipped;
+  uintx  _hashed;
+  uintx  _known;
+  uintx  _new;
+  uintx  _new_bytes;
+  uintx  _deduped;
+  uintx  _deduped_bytes;
+  uintx  _idle;
+  uintx  _exec;
+  uintx  _block;
+
+  // Time spent by the deduplication thread in different phases
+  double _start_concurrent;
+  double _end_concurrent;
+  double _start_phase;
+  double _idle_elapsed;
+  double _exec_elapsed;
+  double _block_elapsed;
+
+public:
+  StringDedupStat();
+
+  void inc_inspected() {
+    _inspected++;
+  }
+
+  void inc_skipped() {
+    _skipped++;
+  }
+
+  void inc_hashed() {
+    _hashed++;
+  }
+
+  void inc_known() {
+    _known++;
+  }
+
+  void inc_new(uintx bytes) {
+    _new++;
+    _new_bytes += bytes;
+  }
+
+  virtual void deduped(oop obj, uintx bytes) {
+    _deduped++;
+    _deduped_bytes += bytes;
+  }
+
+  void mark_idle() {
+    _start_phase = os::elapsedTime();
+    _idle++;
+  }
+
+  void mark_exec() {
+    double now = os::elapsedTime();
+    _idle_elapsed = now - _start_phase;
+    _start_phase = now;
+    _start_concurrent = now;
+    _exec++;
+  }
+
+  void mark_block() {
+    double now = os::elapsedTime();
+    _exec_elapsed += now - _start_phase;
+    _start_phase = now;
+    _block++;
+  }
+
+  void mark_unblock() {
+    double now = os::elapsedTime();
+    _block_elapsed += now - _start_phase;
+    _start_phase = now;
+  }
+
+  void mark_done() {
+    double now = os::elapsedTime();
+    _exec_elapsed += now - _start_phase;
+    _end_concurrent = now;
+  }
+
+  virtual void reset();
+  virtual void add(const StringDedupStat* const stat);
+  virtual void print_statistics(bool total) const;
+
+  static void print_start(const StringDedupStat* last_stat);
+  static void print_end(const StringDedupStat* last_stat, const StringDedupStat* total_stat);
+};
+
+#endif // SHARE_VM_GC_SHARED_STRINGDEDUP_STRINGDEDUPSTAT_HPP
+