--- /dev/null	2020-01-17 11:46:19.065201212 +0100
+++ new/src/hotspot/share/gc/shenandoah/shenandoahTimingTracker.cpp	2020-01-17 17:10:43.697128628 +0100
@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) 2018, Red Hat, Inc. All rights reserved.
+ *
+ * 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/shenandoah/shenandoahHeap.hpp"
+#include "gc/shenandoah/shenandoahPhaseTimings.hpp"
+#include "gc/shenandoah/shenandoahTimingTracker.hpp"
+#include "gc/shenandoah/shenandoahUtils.hpp"
+#include "runtime/os.hpp"
+
+
+ShenandoahPhaseTimings::Phase ShenandoahTerminationTracker::_current_termination_phase = ShenandoahPhaseTimings::_num_phases;
+
+ShenandoahWorkerTimingsTracker::ShenandoahWorkerTimingsTracker(ShenandoahWorkerTimings* worker_times,
+                                                              ShenandoahPhaseTimings::GCParPhases phase, uint worker_id) :
+  _phase(phase), _worker_times(worker_times), _worker_id(worker_id) {
+  if (_worker_times != NULL) {
+    _start_time = os::elapsedTime();
+  }
+}
+
+ShenandoahWorkerTimingsTracker::~ShenandoahWorkerTimingsTracker() {
+  if (_worker_times != NULL) {
+    _worker_times->record_time_secs(_phase, _worker_id, os::elapsedTime() - _start_time);
+  }
+
+  // Do nothing. Per-worker events are not supported in this JDK.
+}
+
+ShenandoahTerminationTimingsTracker::ShenandoahTerminationTimingsTracker(uint worker_id) :
+  _worker_id(worker_id)  {
+  if (ShenandoahTerminationTrace) {
+    _start_time = os::elapsedTime();
+  }
+}
+
+ShenandoahTerminationTimingsTracker::~ShenandoahTerminationTimingsTracker() {
+  if (ShenandoahTerminationTrace) {
+    ShenandoahHeap::heap()->phase_timings()->termination_times()->record_time_secs(_worker_id, os::elapsedTime() - _start_time);
+  }
+}
+
+ShenandoahTerminationTracker::ShenandoahTerminationTracker(ShenandoahPhaseTimings::Phase phase) : _phase(phase) {
+  assert(_current_termination_phase == ShenandoahPhaseTimings::_num_phases, "Should be invalid");
+  assert(phase == ShenandoahPhaseTimings::termination ||
+         phase == ShenandoahPhaseTimings::final_traversal_gc_termination ||
+         phase == ShenandoahPhaseTimings::full_gc_mark_termination ||
+         phase == ShenandoahPhaseTimings::conc_termination ||
+         phase == ShenandoahPhaseTimings::conc_traversal_termination ||
+         phase == ShenandoahPhaseTimings::weakrefs_termination ||
+         phase == ShenandoahPhaseTimings::full_gc_weakrefs_termination,
+         "Only these phases");
+
+  assert(!Thread::current()->is_Worker_thread() &&
+             (Thread::current()->is_VM_thread() ||
+              Thread::current()->is_ConcurrentGC_thread()),
+        "Called from wrong thread");
+
+  _current_termination_phase = phase;
+  ShenandoahHeap::heap()->phase_timings()->termination_times()->reset();
+}
+
+ShenandoahTerminationTracker::~ShenandoahTerminationTracker() {
+  assert(_phase == _current_termination_phase, "Can not change phase");
+  ShenandoahPhaseTimings* phase_times = ShenandoahHeap::heap()->phase_timings();
+
+  double t = phase_times->termination_times()->average();
+  phase_times->record_phase_time(_phase, t);
+  debug_only(_current_termination_phase = ShenandoahPhaseTimings::_num_phases;)
+}