diff -r f9e300086063 -r b7bcf7497f93 hotspot/src/share/vm/gc_implementation/shared/gcTraceTime.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/gc_implementation/shared/gcTraceTime.cpp	Mon Jun 10 11:30:51 2013 +0200
@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2012, 2013, 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_implementation/shared/gcTimer.hpp"
+#include "gc_implementation/shared/gcTraceTime.hpp"
+#include "runtime/globals.hpp"
+#include "runtime/os.hpp"
+#include "runtime/safepoint.hpp"
+#include "runtime/thread.inline.hpp"
+#include "runtime/timer.hpp"
+#include "utilities/ostream.hpp"
+
+
+GCTraceTime::GCTraceTime(const char* title, bool doit, bool print_cr, GCTimer* timer) :
+    _title(title), _doit(doit), _print_cr(print_cr), _timer(timer) {
+  if (_doit || _timer != NULL) {
+    _start_counter = os::elapsed_counter();
+  }
+
+  if (_timer != NULL) {
+    assert(SafepointSynchronize::is_at_safepoint(), "Tracing currently only supported at safepoints");
+    assert(Thread::current()->is_VM_thread(), "Tracing currently only supported from the VM thread");
+
+    _timer->register_gc_phase_start(title, _start_counter);
+  }
+
+  if (_doit) {
+    if (PrintGCTimeStamps) {
+      gclog_or_tty->stamp();
+      gclog_or_tty->print(": ");
+    }
+    gclog_or_tty->print("[%s", title);
+    gclog_or_tty->flush();
+  }
+}
+
+GCTraceTime::~GCTraceTime() {
+  jlong stop_counter = 0;
+
+  if (_doit || _timer != NULL) {
+    stop_counter = os::elapsed_counter();
+  }
+
+  if (_timer != NULL) {
+    _timer->register_gc_phase_end(stop_counter);
+  }
+
+  if (_doit) {
+    double seconds = TimeHelper::counter_to_seconds(stop_counter - _start_counter);
+    if (_print_cr) {
+      gclog_or_tty->print_cr(", %3.7f secs]", seconds);
+    } else {
+      gclog_or_tty->print(", %3.7f secs]", seconds);
+    }
+    gclog_or_tty->flush();
+  }
+}