diff -r 4ebc2e2fb97c -r 71c04702a3d5 src/hotspot/share/gc/shared/gcTraceTime.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/gc/shared/gcTraceTime.cpp	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,60 @@
+/*
+ * Copyright (c) 2012, 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.
+ *
+ */
+
+#include "precompiled.hpp"
+#include "gc/shared/gcTraceTime.inline.hpp"
+#include "logging/log.hpp"
+#include "runtime/os.hpp"
+
+GCTraceCPUTime::GCTraceCPUTime() :
+  _active(log_is_enabled(Info, gc, cpu)),
+  _starting_user_time(0.0),
+  _starting_system_time(0.0),
+  _starting_real_time(0.0)
+{
+  if (_active) {
+    bool valid = os::getTimesSecs(&_starting_real_time,
+                               &_starting_user_time,
+                               &_starting_system_time);
+    if (!valid) {
+      log_warning(gc, cpu)("TraceCPUTime: os::getTimesSecs() returned invalid result");
+      _active = false;
+    }
+  }
+}
+
+GCTraceCPUTime::~GCTraceCPUTime() {
+  if (_active) {
+    double real_time, user_time, system_time;
+    bool valid = os::getTimesSecs(&real_time, &user_time, &system_time);
+    if (valid) {
+      log_info(gc, cpu)("User=%3.2fs Sys=%3.2fs Real=%3.2fs",
+                        user_time - _starting_user_time,
+                        system_time - _starting_system_time,
+                        real_time - _starting_real_time);
+    } else {
+      log_warning(gc, cpu)("TraceCPUTime: os::getTimesSecs() returned invalid result");
+    }
+  }
+}