--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/gc/shared/preGCValues.hpp	Tue Aug 06 15:03:48 2019 -0400
@@ -0,0 +1,74 @@
+/*
+ * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2019, Twitter, Inc.
+ * 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_GC_SHARED_PREGCVALUES_HPP
+#define SHARE_GC_SHARED_PREGCVALUES_HPP
+
+#include "memory/metaspace/metaspaceSizesSnapshot.hpp"
+
+// Simple class for storing info about the heap at the start of GC, to be used
+// after GC for comparison/printing.
+class PreGenGCValues {
+public:
+  PreGenGCValues(size_t young_gen_used,
+                 size_t young_gen_capacity,
+                 size_t eden_used,
+                 size_t eden_capacity,
+                 size_t from_used,
+                 size_t from_capacity,
+                 size_t old_gen_used,
+                 size_t old_gen_capacity)
+      : _young_gen_used(young_gen_used),
+        _young_gen_capacity(young_gen_capacity),
+        _eden_used(eden_used),
+        _eden_capacity(eden_capacity),
+        _from_used(from_used),
+        _from_capacity(from_capacity),
+        _old_gen_used(old_gen_used),
+        _old_gen_capacity(old_gen_capacity) { }
+
+  size_t young_gen_used()     const { return _young_gen_used;     }
+  size_t young_gen_capacity() const { return _young_gen_capacity; }
+  size_t eden_used()          const { return _eden_used;          }
+  size_t eden_capacity()      const { return _eden_capacity;      }
+  size_t from_used()          const { return _from_used;          }
+  size_t from_capacity()      const { return _from_capacity;      }
+  size_t old_gen_used()       const { return _old_gen_used;       }
+  size_t old_gen_capacity()   const { return _old_gen_capacity;   }
+  const metaspace::MetaspaceSizesSnapshot& metaspace_sizes() const { return _meta_sizes; }
+
+private:
+  const size_t _young_gen_used;
+  const size_t _young_gen_capacity;
+  const size_t _eden_used;
+  const size_t _eden_capacity;
+  const size_t _from_used;
+  const size_t _from_capacity;
+  const size_t _old_gen_used;
+  const size_t _old_gen_capacity;
+  const metaspace::MetaspaceSizesSnapshot _meta_sizes;
+};
+
+#endif // SHARE_GC_SHARED_PREGCVALUES_HPP