--- /dev/null	2018-04-03 12:55:20.301839954 +0200
+++ new/src/hotspot/os_cpu/linux_x86/gc/z/zVirtualMemory_linux_x86.cpp	2018-06-01 22:30:14.516754602 +0200
@@ -0,0 +1,41 @@
+/*
+ * Copyright (c) 2015, 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.
+ */
+
+#include "precompiled.hpp"
+#include "gc/z/zVirtualMemory.hpp"
+#include "logging/log.hpp"
+
+#include <sys/mman.h>
+#include <sys/types.h>
+
+bool ZVirtualMemoryManager::reserve(uintptr_t start, size_t size) {
+  // Reserve address space
+  const uintptr_t actual_start = (uintptr_t)mmap((void*)start, size, PROT_NONE,
+                                                 MAP_ANONYMOUS|MAP_PRIVATE|MAP_NORESERVE, -1, 0);
+  if (actual_start != start) {
+    log_error(gc)("Failed to reserve address space for Java heap");
+    return false;
+  }
+
+  return true;
+}