--- /dev/null	2019-01-28 17:46:22.000000000 +0800
+++ new/src/share/vm/jfr/leakprofiler/utilities/granularTimer.cpp	2019-01-28 17:46:22.000000000 +0800
@@ -0,0 +1,76 @@
+/*
+ * Copyright (c) 2014, 2019, 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 "jfr/leakprofiler/utilities/granularTimer.hpp"
+#include "trace/traceBackend.hpp"
+
+long GranularTimer::_granularity = 0;
+long GranularTimer::_counter = 0;
+JfrTraceTime GranularTimer::_finish_time_ticks = 0;
+JfrTraceTime GranularTimer::_start_time_ticks = 0;
+bool GranularTimer::_finished = false;
+
+void GranularTimer::start(jlong duration_ticks, long granularity) {
+  assert(granularity > 0, "granularity must be at least 1");
+  _granularity = granularity;
+  _counter = granularity;
+  _start_time_ticks = JfrTraceTime::now();
+  const jlong end_time_ticks = _start_time_ticks.value() + duration_ticks;
+  _finish_time_ticks = end_time_ticks < 0 ? JfrTraceTime(max_jlong) : JfrTraceTime(end_time_ticks);
+  _finished = _finish_time_ticks == _start_time_ticks;
+  assert(_finish_time_ticks >= 0, "invariant");
+  assert(_finish_time_ticks >= _start_time_ticks, "invariant");
+}
+void GranularTimer::stop() {
+  if (!_finished) {
+    _finish_time_ticks = JfrTraceTime::now();
+  }
+}
+const JfrTraceTime& GranularTimer::start_time() {
+  return _start_time_ticks;
+}
+
+const JfrTraceTime& GranularTimer::end_time() {
+  return _finish_time_ticks;
+}
+
+bool GranularTimer::is_finished() {
+  assert(_granularity != 0, "GranularTimer::is_finished must be called after GranularTimer::start");
+  if (--_counter == 0) {
+    if (_finished) {
+      // reset so we decrease to zero at next iteration
+      _counter = 1;
+      return true;
+    }
+    if (JfrTraceTime::now() > _finish_time_ticks) {
+      _finished = true;
+      _counter = 1;
+      return true;
+    }
+    assert(_counter == 0, "invariant");
+    _counter = _granularity; // restore next batch
+  }
+  return false;
+}