--- /dev/null	2018-11-26 11:49:18.255023023 +0100
+++ new/src/hotspot/share/gc/shenandoah/shenandoahCollectorPolicy.cpp	2018-11-26 21:29:57.102161037 +0100
@@ -0,0 +1,149 @@
+/*
+ * Copyright (c) 2013, 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/shenandoahCollectorPolicy.hpp"
+#include "gc/shenandoah/shenandoahHeap.inline.hpp"
+#include "runtime/os.hpp"
+
+ShenandoahCollectorPolicy::ShenandoahCollectorPolicy() :
+  _success_concurrent_gcs(0),
+  _success_degenerated_gcs(0),
+  _success_full_gcs(0),
+  _alloc_failure_degenerated(0),
+  _alloc_failure_degenerated_upgrade_to_full(0),
+  _alloc_failure_full(0),
+  _explicit_concurrent(0),
+  _explicit_full(0),
+  _implicit_concurrent(0),
+  _implicit_full(0),
+  _cycle_counter(0) {
+
+  Copy::zero_to_bytes(_degen_points, sizeof(size_t) * ShenandoahHeap::_DEGENERATED_LIMIT);
+
+  ShenandoahHeapRegion::setup_sizes(initial_heap_byte_size(), max_heap_byte_size());
+
+  initialize_all();
+
+  _tracer = new (ResourceObj::C_HEAP, mtGC) ShenandoahTracer();
+
+}
+
+void ShenandoahCollectorPolicy::initialize_alignments() {
+  // This is expected by our algorithm for ShenandoahHeap::heap_region_containing().
+  size_t align = ShenandoahHeapRegion::region_size_bytes();
+  if (UseLargePages) {
+    align = MAX2(align, os::large_page_size());
+  }
+  _space_alignment = align;
+  _heap_alignment = align;
+}
+
+void ShenandoahCollectorPolicy::record_explicit_to_concurrent() {
+  _explicit_concurrent++;
+}
+
+void ShenandoahCollectorPolicy::record_explicit_to_full() {
+  _explicit_full++;
+}
+
+void ShenandoahCollectorPolicy::record_implicit_to_concurrent() {
+  _implicit_concurrent++;
+}
+
+void ShenandoahCollectorPolicy::record_implicit_to_full() {
+  _implicit_full++;
+}
+
+void ShenandoahCollectorPolicy::record_alloc_failure_to_full() {
+  _alloc_failure_full++;
+}
+
+void ShenandoahCollectorPolicy::record_alloc_failure_to_degenerated(ShenandoahHeap::ShenandoahDegenPoint point) {
+  assert(point < ShenandoahHeap::_DEGENERATED_LIMIT, "sanity");
+  _alloc_failure_degenerated++;
+  _degen_points[point]++;
+}
+
+void ShenandoahCollectorPolicy::record_degenerated_upgrade_to_full() {
+  _alloc_failure_degenerated_upgrade_to_full++;
+}
+
+void ShenandoahCollectorPolicy::record_success_concurrent() {
+  _success_concurrent_gcs++;
+}
+
+void ShenandoahCollectorPolicy::record_success_degenerated() {
+  _success_degenerated_gcs++;
+}
+
+void ShenandoahCollectorPolicy::record_success_full() {
+  _success_full_gcs++;
+}
+
+size_t ShenandoahCollectorPolicy::cycle_counter() const {
+  return _cycle_counter;
+}
+
+void ShenandoahCollectorPolicy::record_cycle_start() {
+  _cycle_counter++;
+}
+
+void ShenandoahCollectorPolicy::record_shutdown() {
+  _in_shutdown.set();
+}
+
+bool ShenandoahCollectorPolicy::is_at_shutdown() {
+  return _in_shutdown.is_set();
+}
+
+void ShenandoahCollectorPolicy::print_gc_stats(outputStream* out) const {
+  out->print_cr("Under allocation pressure, concurrent cycles may cancel, and either continue cycle");
+  out->print_cr("under stop-the-world pause or result in stop-the-world Full GC. Increase heap size,");
+  out->print_cr("tune GC heuristics, set more aggressive pacing delay, or lower allocation rate");
+  out->print_cr("to avoid Degenerated and Full GC cycles.");
+  out->cr();
+
+  out->print_cr(SIZE_FORMAT_W(5) " successful concurrent GCs",         _success_concurrent_gcs);
+  out->print_cr("  " SIZE_FORMAT_W(5) " invoked explicitly",           _explicit_concurrent);
+  out->print_cr("  " SIZE_FORMAT_W(5) " invoked implicitly",           _implicit_concurrent);
+  out->cr();
+
+  out->print_cr(SIZE_FORMAT_W(5) " Degenerated GCs",                   _success_degenerated_gcs);
+  out->print_cr("  " SIZE_FORMAT_W(5) " caused by allocation failure", _alloc_failure_degenerated);
+  for (int c = 0; c < ShenandoahHeap::_DEGENERATED_LIMIT; c++) {
+    if (_degen_points[c] > 0) {
+      const char* desc = ShenandoahHeap::degen_point_to_string((ShenandoahHeap::ShenandoahDegenPoint)c);
+      out->print_cr("    " SIZE_FORMAT_W(5) " happened at %s",         _degen_points[c], desc);
+    }
+  }
+  out->print_cr("  " SIZE_FORMAT_W(5) " upgraded to Full GC",          _alloc_failure_degenerated_upgrade_to_full);
+  out->cr();
+
+  out->print_cr(SIZE_FORMAT_W(5) " Full GCs",                          _success_full_gcs + _alloc_failure_degenerated_upgrade_to_full);
+  out->print_cr("  " SIZE_FORMAT_W(5) " invoked explicitly",           _explicit_full);
+  out->print_cr("  " SIZE_FORMAT_W(5) " invoked implicitly",           _implicit_full);
+  out->print_cr("  " SIZE_FORMAT_W(5) " caused by allocation failure", _alloc_failure_full);
+  out->print_cr("  " SIZE_FORMAT_W(5) " upgraded from Degenerated GC", _alloc_failure_degenerated_upgrade_to_full);
+}