--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/gc/shared/gcTraceTime.hpp	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,89 @@
+/*
+ * 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.
+ *
+ */
+
+#ifndef SHARE_VM_GC_SHARED_GCTRACETIME_HPP
+#define SHARE_VM_GC_SHARED_GCTRACETIME_HPP
+
+#include "logging/log.hpp"
+#include "logging/logHandle.hpp"
+#include "logging/logStream.hpp"
+#include "memory/allocation.hpp"
+#include "utilities/ticks.hpp"
+
+class GCTraceCPUTime : public StackObj {
+  bool _active;                 // true if times will be measured and printed
+  double _starting_user_time;   // user time at start of measurement
+  double _starting_system_time; // system time at start of measurement
+  double _starting_real_time;   // real time at start of measurement
+ public:
+  GCTraceCPUTime();
+  ~GCTraceCPUTime();
+};
+
+class GCTimer;
+
+class GCTraceTimeImpl : public StackObj {
+ private:
+  LogTargetHandle _out_start;
+  LogTargetHandle _out_stop;
+  bool _enabled;
+  Ticks _start_ticks;
+  const char* _title;
+  GCCause::Cause _gc_cause;
+  GCTimer* _timer;
+  size_t _heap_usage_before;
+
+  void log_start(jlong start_counter);
+  void log_stop(jlong start_counter, jlong stop_counter);
+  void time_stamp(Ticks& ticks);
+
+ public:
+  GCTraceTimeImpl(LogTargetHandle out_start, LogTargetHandle out_end, const char* title, GCTimer* timer = NULL, GCCause::Cause gc_cause = GCCause::_no_gc, bool log_heap_usage = false);
+  ~GCTraceTimeImpl();
+};
+
+template <LogLevelType Level, LogTagType T0, LogTagType T1, LogTagType T2, LogTagType T3, LogTagType T4, LogTagType GuardTag>
+class GCTraceTimeImplWrapper : public StackObj {
+  GCTraceTimeImpl _impl;
+public:
+  GCTraceTimeImplWrapper(const char* title, GCTimer* timer = NULL, GCCause::Cause gc_cause = GCCause::_no_gc, bool log_heap_usage = false);
+  ~GCTraceTimeImplWrapper();
+};
+
+// Similar to GCTraceTimeImpl but is intended for concurrent phase logging,
+// which is a bit simpler and should always print the start line, i.e. not add the "start" tag.
+template <LogLevelType Level, LogTagType T0, LogTagType T1 = LogTag::__NO_TAG, LogTagType T2 = LogTag::__NO_TAG, LogTagType T3 = LogTag::__NO_TAG,
+    LogTagType T4 = LogTag::__NO_TAG, LogTagType GuardTag = LogTag::__NO_TAG>
+class GCTraceConcTimeImpl : public StackObj {
+ private:
+  bool _enabled;
+  jlong _start_time;
+  const char* _title;
+ public:
+  GCTraceConcTimeImpl(const char* title);
+  ~GCTraceConcTimeImpl();
+  jlong start_time() { return _start_time; }
+};
+
+#endif // SHARE_VM_GC_SHARED_GCTRACETIME_HPP