--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/hotspot/gtest/memory/test_metachunk.cpp	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) 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 "memory/allocation.hpp"
+#include "memory/metachunk.hpp"
+#include "unittest.hpp"
+#include "utilities/align.hpp"
+#include "utilities/copy.hpp"
+#include "utilities/debug.hpp"
+
+class MetachunkTest {
+ public:
+  static MetaWord* initial_top(Metachunk* metachunk) {
+    return metachunk->initial_top();
+  }
+  static MetaWord* top(Metachunk* metachunk) {
+    return metachunk->top();
+  }
+
+};
+
+TEST(Metachunk, basic) {
+  size_t size = 2 * 1024 * 1024;
+  void* memory = malloc(size);
+  ASSERT_TRUE(NULL != memory) << "Failed to malloc 2MB";
+
+  Metachunk* metachunk = ::new (memory) Metachunk(size / BytesPerWord, NULL);
+
+  EXPECT_EQ((MetaWord*) metachunk, metachunk->bottom());
+  EXPECT_EQ((uintptr_t*) metachunk + metachunk->size(), metachunk->end());
+
+  // Check sizes
+  EXPECT_EQ(metachunk->size(), metachunk->word_size());
+  EXPECT_EQ(pointer_delta(metachunk->end(), metachunk->bottom(),
+                sizeof (MetaWord*)),
+            metachunk->word_size());
+
+  // Check usage
+  EXPECT_EQ(metachunk->used_word_size(), metachunk->overhead());
+  EXPECT_EQ(metachunk->word_size() - metachunk->used_word_size(),
+            metachunk->free_word_size());
+  EXPECT_EQ(MetachunkTest::top(metachunk), MetachunkTest::initial_top(metachunk));
+  EXPECT_TRUE(metachunk->is_empty());
+
+  // Allocate
+  size_t alloc_size = 64; // Words
+  EXPECT_TRUE(is_aligned(alloc_size, Metachunk::object_alignment()));
+
+  MetaWord* mem = metachunk->allocate(alloc_size);
+
+  // Check post alloc
+  EXPECT_EQ(MetachunkTest::initial_top(metachunk), mem);
+  EXPECT_EQ(MetachunkTest::top(metachunk), mem + alloc_size);
+  EXPECT_EQ(metachunk->overhead() + alloc_size, metachunk->used_word_size());
+  EXPECT_EQ(metachunk->word_size() - metachunk->used_word_size(),
+            metachunk->free_word_size());
+  EXPECT_FALSE(metachunk->is_empty());
+
+  // Clear chunk
+  metachunk->reset_empty();
+
+  // Check post clear
+  EXPECT_EQ(metachunk->used_word_size(), metachunk->overhead());
+  EXPECT_EQ(metachunk->word_size() - metachunk->used_word_size(),
+            metachunk->free_word_size());
+  EXPECT_EQ(MetachunkTest::top(metachunk), MetachunkTest::initial_top(metachunk));
+  EXPECT_TRUE(metachunk->is_empty());
+
+  free(memory);
+}