--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/gc/shenandoah/heuristics/shenandoahStaticHeuristics.cpp	Mon Dec 10 15:47:44 2018 +0100
@@ -0,0 +1,93 @@
+/*
+ * 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/heuristics/shenandoahStaticHeuristics.hpp"
+#include "gc/shenandoah/shenandoahCollectionSet.hpp"
+#include "gc/shenandoah/shenandoahFreeSet.hpp"
+#include "gc/shenandoah/shenandoahHeapRegion.hpp"
+#include "logging/log.hpp"
+#include "logging/logTag.hpp"
+
+ShenandoahStaticHeuristics::ShenandoahStaticHeuristics() : ShenandoahHeuristics() {
+  // Static heuristics may degrade to continuous if live data is larger
+  // than free threshold. ShenandoahAllocationThreshold is supposed to break this,
+  // but it only works if it is non-zero.
+  SHENANDOAH_ERGO_OVERRIDE_DEFAULT(ShenandoahAllocationThreshold, 1);
+
+  SHENANDOAH_ERGO_ENABLE_FLAG(ExplicitGCInvokesConcurrent);
+  SHENANDOAH_ERGO_ENABLE_FLAG(ShenandoahImplicitGCInvokesConcurrent);
+
+  // Final configuration checks
+  SHENANDOAH_CHECK_FLAG_SET(ShenandoahSATBBarrier);
+  SHENANDOAH_CHECK_FLAG_SET(ShenandoahReadBarrier);
+  SHENANDOAH_CHECK_FLAG_SET(ShenandoahWriteBarrier);
+  SHENANDOAH_CHECK_FLAG_SET(ShenandoahStoreValReadBarrier);
+  SHENANDOAH_CHECK_FLAG_SET(ShenandoahKeepAliveBarrier);
+  SHENANDOAH_CHECK_FLAG_SET(ShenandoahCASBarrier);
+  SHENANDOAH_CHECK_FLAG_SET(ShenandoahAcmpBarrier);
+  SHENANDOAH_CHECK_FLAG_SET(ShenandoahCloneBarrier);
+}
+
+ShenandoahStaticHeuristics::~ShenandoahStaticHeuristics() {}
+
+bool ShenandoahStaticHeuristics::should_start_normal_gc() const {
+  ShenandoahHeap* heap = ShenandoahHeap::heap();
+
+  size_t capacity = heap->capacity();
+  size_t available = heap->free_set()->available();
+  size_t threshold_available = (capacity * ShenandoahFreeThreshold) / 100;
+
+  if (available < threshold_available) {
+    log_info(gc)("Trigger: Free (" SIZE_FORMAT "M) is below free threshold (" SIZE_FORMAT "M)",
+                 available / M, threshold_available / M);
+    return true;
+  }
+  return ShenandoahHeuristics::should_start_normal_gc();
+}
+
+void ShenandoahStaticHeuristics::choose_collection_set_from_regiondata(ShenandoahCollectionSet* cset,
+                                                                       RegionData* data, size_t size,
+                                                                       size_t free) {
+  size_t threshold = ShenandoahHeapRegion::region_size_bytes() * ShenandoahGarbageThreshold / 100;
+
+  for (size_t idx = 0; idx < size; idx++) {
+    ShenandoahHeapRegion* r = data[idx]._region;
+    if (r->garbage() > threshold) {
+      cset->add_region(r);
+    }
+  }
+}
+
+const char* ShenandoahStaticHeuristics::name() {
+  return "static";
+}
+
+bool ShenandoahStaticHeuristics::is_diagnostic() {
+  return false;
+}
+
+bool ShenandoahStaticHeuristics::is_experimental() {
+  return false;
+}