--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/gc/shared/genMemoryPools.hpp	Thu Nov 30 13:40:07 2017 +0100
@@ -0,0 +1,75 @@
+/*
+ * Copyright (c) 2017, 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.
+ *
+ */
+
+#ifndef SHARE_VM_GC_SHARED_GENMEMORYPOOLS_HPP
+#define SHARE_VM_GC_SHARED_GENMEMORYPOOLS_HPP
+
+#include "services/memoryPool.hpp"
+
+class ContiguousSpace;
+class DefNewGeneration;
+class Generation;
+
+class ContiguousSpacePool : public CollectedMemoryPool {
+private:
+  ContiguousSpace* _space;
+
+public:
+  ContiguousSpacePool(ContiguousSpace* space,
+                      const char* name,
+                      size_t max_size,
+                      bool support_usage_threshold);
+
+  ContiguousSpace* space() { return _space; }
+  MemoryUsage get_memory_usage();
+  size_t used_in_bytes();
+};
+
+class SurvivorContiguousSpacePool : public CollectedMemoryPool {
+private:
+  DefNewGeneration* _young_gen;
+
+public:
+  SurvivorContiguousSpacePool(DefNewGeneration* young_gen,
+                              const char* name,
+                              size_t max_size,
+                              bool support_usage_threshold);
+
+  MemoryUsage get_memory_usage();
+
+  size_t used_in_bytes();
+  size_t committed_in_bytes();
+};
+
+class GenerationPool : public CollectedMemoryPool {
+private:
+  Generation* _gen;
+public:
+  GenerationPool(Generation* gen, const char* name, bool support_usage_threshold);
+
+  MemoryUsage get_memory_usage();
+  size_t used_in_bytes();
+};
+
+#endif // SHARE_VM_GC_SHARED_GENMEMORYPOOLS_HPP