--- /dev/null	2019-06-10 08:42:37.317240407 +0100
+++ new/src/hotspot/os_cpu/linux_aarch64/gc/z/zBackingFile_linux_aarch64.hpp	2019-06-10 14:25:45.230298717 +0100
@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 2015, 2019, 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 OS_CPU_LINUX_AARCH64_GC_Z_ZBACKINGFILE_LINUX_AARCH64_HPP
+#define OS_CPU_LINUX_AARCH64_GC_Z_ZBACKINGFILE_LINUX_AARCH64_HPP
+
+#include "memory/allocation.hpp"
+
+class ZErrno;
+
+class ZBackingFile {
+private:
+  int      _fd;
+  size_t   _size;
+  uint64_t _filesystem;
+  size_t   _block_size;
+  size_t   _available;
+  bool     _initialized;
+
+  int create_mem_fd(const char* name) const;
+  int create_file_fd(const char* name) const;
+  int create_fd(const char* name) const;
+
+  bool is_tmpfs() const;
+  bool is_hugetlbfs() const;
+  bool tmpfs_supports_transparent_huge_pages() const;
+
+  ZErrno fallocate_compat_ftruncate(size_t size) const;
+  ZErrno fallocate_compat_mmap(size_t offset, size_t length, bool reserve_only) const;
+  ZErrno fallocate_compat_pwrite(size_t offset, size_t length) const;
+  ZErrno fallocate_fill_hole_compat(size_t offset, size_t length);
+  ZErrno fallocate_fill_hole_syscall(size_t offset, size_t length);
+  ZErrno fallocate_fill_hole(size_t offset, size_t length);
+  ZErrno fallocate_punch_hole(size_t offset, size_t length);
+  ZErrno split_and_fallocate(bool punch_hole, size_t offset, size_t length);
+  ZErrno fallocate(bool punch_hole, size_t offset, size_t length);
+
+  bool commit_inner(size_t offset, size_t length);
+
+public:
+  ZBackingFile();
+
+  bool is_initialized() const;
+
+  int fd() const;
+  size_t size() const;
+  size_t available() const;
+
+  size_t commit(size_t offset, size_t length);
+  size_t uncommit(size_t offset, size_t length);
+};
+
+#endif // OS_CPU_LINUX_AARCH64_GC_Z_ZBACKINGFILE_LINUX_AARCH64_HPP