--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/gc/g1/g1CollectorPolicy.cpp	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2001, 2016, 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 "gc/g1/g1Analytics.hpp"
+#include "gc/g1/g1CollectorPolicy.hpp"
+#include "gc/g1/g1YoungGenSizer.hpp"
+#include "gc/g1/heapRegion.hpp"
+#include "gc/g1/heapRegionRemSet.hpp"
+#include "gc/shared/gcPolicyCounters.hpp"
+#include "runtime/globals.hpp"
+#include "utilities/debug.hpp"
+
+G1CollectorPolicy::G1CollectorPolicy() {
+
+  // Set up the region size and associated fields. Given that the
+  // policy is created before the heap, we have to set this up here,
+  // so it's done as soon as possible.
+
+  // It would have been natural to pass initial_heap_byte_size() and
+  // max_heap_byte_size() to setup_heap_region_size() but those have
+  // not been set up at this point since they should be aligned with
+  // the region size. So, there is a circular dependency here. We base
+  // the region size on the heap size, but the heap size should be
+  // aligned with the region size. To get around this we use the
+  // unaligned values for the heap.
+  HeapRegion::setup_heap_region_size(InitialHeapSize, MaxHeapSize);
+  HeapRegionRemSet::setup_remset_size();
+}
+
+void G1CollectorPolicy::initialize_alignments() {
+  _space_alignment = HeapRegion::GrainBytes;
+  size_t card_table_alignment = CardTableRS::ct_max_alignment_constraint();
+  size_t page_size = UseLargePages ? os::large_page_size() : os::vm_page_size();
+  _heap_alignment = MAX3(card_table_alignment, _space_alignment, page_size);
+}