--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/gc/shared/collectorCounters.hpp	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,87 @@
+/*
+ * Copyright (c) 2002, 2015, 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_COLLECTORCOUNTERS_HPP
+#define SHARE_VM_GC_SHARED_COLLECTORCOUNTERS_HPP
+
+#include "runtime/perfData.hpp"
+
+// CollectorCounters is a holder class for performance counters
+// that track a collector
+
+class CollectorCounters: public CHeapObj<mtGC> {
+  friend class VMStructs;
+
+  private:
+    PerfCounter*      _invocations;
+    PerfCounter*      _time;
+    PerfVariable*     _last_entry_time;
+    PerfVariable*     _last_exit_time;
+
+    // Constant PerfData types don't need to retain a reference.
+    // However, it's a good idea to document them here.
+    // PerfStringConstant*     _name;
+
+    char*             _name_space;
+
+  public:
+
+    CollectorCounters(const char* name, int ordinal);
+
+    ~CollectorCounters() {
+      if (_name_space != NULL) FREE_C_HEAP_ARRAY(char, _name_space);
+    }
+
+    inline PerfCounter* invocation_counter() const  { return _invocations; }
+
+    inline PerfCounter* time_counter() const        { return _time; }
+
+    inline PerfVariable* last_entry_counter() const { return _last_entry_time; }
+
+    inline PerfVariable* last_exit_counter() const  { return _last_exit_time; }
+
+    const char* name_space() const                  { return _name_space; }
+};
+
+class TraceCollectorStats: public PerfTraceTimedEvent {
+
+  protected:
+    CollectorCounters* _c;
+
+  public:
+    inline TraceCollectorStats(CollectorCounters* c) :
+           PerfTraceTimedEvent(c->time_counter(), c->invocation_counter()),
+           _c(c) {
+
+      if (UsePerfData) {
+         _c->last_entry_counter()->set_value(os::elapsed_counter());
+      }
+    }
+
+    inline ~TraceCollectorStats() {
+      if (UsePerfData) _c->last_exit_counter()->set_value(os::elapsed_counter());
+    }
+};
+
+#endif // SHARE_VM_GC_SHARED_COLLECTORCOUNTERS_HPP