diff a/src/hotspot/share/gc/shenandoah/shenandoahEvacTracker.cpp b/src/hotspot/share/gc/shenandoah/shenandoahEvacTracker.cpp
--- /dev/null
+++ b/src/hotspot/share/gc/shenandoah/shenandoahEvacTracker.cpp
@@ -0,0 +1,172 @@
+/*
+ * Copyright Amazon.com Inc. 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/shenandoah/shenandoahAgeCensus.hpp"
+#include "gc/shenandoah/shenandoahHeap.inline.hpp"
+#include "gc/shenandoah/shenandoahEvacTracker.hpp"
+#include "gc/shenandoah/shenandoahThreadLocalData.hpp"
+#include "gc/shenandoah/shenandoahRootProcessor.hpp"
+#include "runtime/threadSMR.inline.hpp"
+#include "runtime/thread.hpp"
+
+ShenandoahEvacuationStats::ShenandoahEvacuationStats(bool generational)
+  : _evacuations_completed(0), _bytes_completed(0),
+    _evacuations_attempted(0), _bytes_attempted(0),
+    _use_age_table(generational && (ShenandoahGenerationalCensusAtEvac || !ShenandoahGenerationalAdaptiveTenuring)) {
+  if (_use_age_table) {
+    _age_table = new AgeTable(false);
+  }
+}
+
+AgeTable* ShenandoahEvacuationStats::age_table() const {
+  assert(_use_age_table, "Don't call");
+  return _age_table;
+}
+
+void ShenandoahEvacuationStats::begin_evacuation(size_t bytes) {
+  ++_evacuations_attempted;
+  _bytes_attempted += bytes;
+}
+
+void ShenandoahEvacuationStats::end_evacuation(size_t bytes) {
+  ++_evacuations_completed;
+  _bytes_completed += bytes;
+}
+
+void ShenandoahEvacuationStats::record_age(size_t bytes, uint age) {
+  assert(_use_age_table, "Don't call!");
+  if (age <= markWord::max_age) { // Filter age sentinel.
+    _age_table->add(age, bytes >> LogBytesPerWord);
+  }
+}
+
+void ShenandoahEvacuationStats::accumulate(const ShenandoahEvacuationStats* other) {
+  _evacuations_completed += other->_evacuations_completed;
+  _bytes_completed += other->_bytes_completed;
+  _evacuations_attempted += other->_evacuations_attempted;
+  _bytes_attempted += other->_bytes_attempted;
+  if (_use_age_table) {
+    _age_table->merge(other->age_table());
+  }
+}
+
+void ShenandoahEvacuationStats::reset() {
+  _evacuations_completed = _evacuations_attempted = 0;
+  _bytes_completed = _bytes_attempted = 0;
+  if (_use_age_table) {
+    _age_table->clear();
+  }
+}
+
+void ShenandoahEvacuationStats::print_on(outputStream* st) {
+  size_t abandoned_size = _bytes_attempted - _bytes_completed;
+  size_t abandoned_count = _evacuations_attempted - _evacuations_completed;
+  st->print_cr("Evacuated " SIZE_FORMAT "%s across " SIZE_FORMAT " objects, "
+            "abandoned " SIZE_FORMAT "%s across " SIZE_FORMAT " objects.",
+            byte_size_in_proper_unit(_bytes_completed), proper_unit_for_byte_size(_bytes_completed),
+            _evacuations_completed,
+            byte_size_in_proper_unit(abandoned_size),   proper_unit_for_byte_size(abandoned_size),
+            abandoned_count);
+  if (_use_age_table) {
+    _age_table->print_on(st);
+  }
+}
+
+void ShenandoahEvacuationTracker::print_global_on(outputStream* st) {
+  print_evacuations_on(st, &_workers_global, &_mutators_global);
+}
+
+void ShenandoahEvacuationTracker::print_evacuations_on(outputStream* st,
+                                                       ShenandoahEvacuationStats* workers,
+                                                       ShenandoahEvacuationStats* mutators) {
+  st->print("Workers: ");
+  workers->print_on(st);
+  st->cr();
+  st->print("Mutators: ");
+  mutators->print_on(st);
+  st->cr();
+
+  ShenandoahHeap* heap = ShenandoahHeap::heap();
+  if (_generational) {
+    AgeTable young_region_ages(false);
+    for (uint i = 0; i < heap->num_regions(); ++i) {
+      ShenandoahHeapRegion* r = heap->get_region(i);
+      if (r->is_young()) {
+        young_region_ages.add(r->age(), r->get_live_data_words());
+      }
+    }
+    st->print("Young regions: ");
+    young_region_ages.print_on(st);
+    st->cr();
+  }
+}
+
+class ShenandoahStatAggregator : public ThreadClosure {
+public:
+  ShenandoahEvacuationStats* _target;
+  explicit ShenandoahStatAggregator(ShenandoahEvacuationStats* target) : _target(target) {}
+  virtual void do_thread(Thread* thread) override {
+    ShenandoahEvacuationStats* local = ShenandoahThreadLocalData::evacuation_stats(thread);
+    _target->accumulate(local);
+    local->reset();
+  }
+};
+
+ShenandoahCycleStats ShenandoahEvacuationTracker::flush_cycle_to_global() {
+  ShenandoahEvacuationStats mutators(_generational), workers(_generational);
+
+  ThreadsListHandle java_threads_iterator;
+  ShenandoahStatAggregator aggregate_mutators(&mutators);
+  java_threads_iterator.list()->threads_do(&aggregate_mutators);
+
+  ShenandoahStatAggregator aggregate_workers(&workers);
+  ShenandoahHeap::heap()->gc_threads_do(&aggregate_workers);
+
+  _mutators_global.accumulate(&mutators);
+  _workers_global.accumulate(&workers);
+
+  if (_generational && (ShenandoahGenerationalCensusAtEvac || !ShenandoahGenerationalAdaptiveTenuring)) {
+    // Ingest mutator & worker collected population vectors into the heap's
+    // global census data, and use it to compute an appropriate tenuring threshold
+    // for use in the next cycle.
+    // The first argument is used for any age 0 cohort population that we may otherwise have
+    // missed during the census. This is non-zero only when census happens at marking.
+    ShenandoahGenerationalHeap::heap()->age_census()->update_census(0, _mutators_global.age_table(), _workers_global.age_table());
+  }
+
+  return {workers, mutators};
+}
+
+void ShenandoahEvacuationTracker::begin_evacuation(Thread* thread, size_t bytes) {
+  ShenandoahThreadLocalData::begin_evacuation(thread, bytes);
+}
+
+void ShenandoahEvacuationTracker::end_evacuation(Thread* thread, size_t bytes) {
+  ShenandoahThreadLocalData::end_evacuation(thread, bytes);
+}
+
+void ShenandoahEvacuationTracker::record_age(Thread* thread, size_t bytes, uint age) {
+  ShenandoahThreadLocalData::record_age(thread, bytes, age);
+}
