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diff --git a/lib/dtrace/examples/efile_drv.systemtap b/lib/dtrace/examples/efile_drv.systemtap
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+/*
+ * %CopyrightBegin%
+ *
+ * Copyright Scott Lystig Fritchie and Andreas Schultz, 2011. All Rights Reserved.
+ *
+ * The contents of this file are subject to the Erlang Public License,
+ * Version 1.1, (the "License"); you may not use this file except in
+ * compliance with the License. You should have received a copy of the
+ * Erlang Public License along with this software. If not, it can be
+ * retrieved online at http://www.erlang.org/.
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * %CopyrightEnd%
+ */
+/*
+ * Note: This file assumes that you're using the non-SMP-enabled Erlang
+ * virtual machine, "beam". The SMP-enabled VM is called "beam.smp".
+ * Note that other variations of the virtual machine also have
+ * different names, e.g. the debug build of the SMP-enabled VM
+ * is "beam.debug.smp".
+ *
+ * To use a different virtual machine, replace each instance of
+ * "beam" with "beam.smp" or the VM name appropriate to your
+ * environment.
+ */
+
+probe begin
+{
+ op_map[1] = "OPEN";
+ op_map[2] = "READ";
+ op_map[3] = "LSEEK";
+ op_map[4] = "WRITE";
+ op_map[5] = "FSTAT";
+ op_map[6] = "PWD";
+ op_map[7] = "READDIR";
+ op_map[8] = "CHDIR";
+ op_map[9] = "FSYNC";
+ op_map[10] = "MKDIR";
+ op_map[11] = "DELETE";
+ op_map[12] = "RENAME";
+ op_map[13] = "RMDIR";
+ op_map[14] = "TRUNCATE";
+ op_map[15] = "READ_FILE";
+ op_map[16] = "WRITE_INFO";
+ op_map[19] = "LSTAT";
+ op_map[20] = "READLINK";
+ op_map[21] = "LINK";
+ op_map[22] = "SYMLINK";
+ op_map[23] = "CLOSE";
+ op_map[24] = "PWRITEV";
+ op_map[25] = "PREADV";
+ op_map[26] = "SETOPT";
+ op_map[27] = "IPREAD";
+ op_map[28] = "ALTNAME";
+ op_map[29] = "READ_LINE";
+ op_map[30] = "FDATASYNC";
+ op_map[31] = "FADVISE";
+}
+
+probe process("beam").mark("aio_pool-add")
+{
+ printf("async I/O pool port %s queue len %d\n", user_string($arg1), $arg2);
+}
+
+probe process("beam").mark("aio_pool-get")
+{
+ printf("async I/O pool port %s queue len %d\n", user_string($arg1), $arg2);
+}
+
+probe process("beam").mark("efile_drv-entry")
+{
+ printf("efile_drv enter tag={%d,%d} %s%s | %s (%d) | args: %s %s , %d %d (port %s)\n",
+ $arg1, $arg2,
+ $arg3 == NULL ? "" : "user tag ",
+ $arg3 == NULL ? "" : user_string($arg3),
+ op_map[$arg4], $arg4,
+ $arg5 == NULL ? "" : user_string($arg5),
+ $arg6 == NULL ? "" : user_string($arg6), $arg7, $arg8,
+ /* NOTE: port name in $arg[11] is experimental */
+ user_string($arg11))
+}
+
+probe process("beam").mark("efile_drv-int*")
+{
+ printf("async I/O worker tag={%d,%d} | %s (%d) | %s\n",
+ $arg1, $arg2, op_map[$arg3], $arg3, probefunc());
+}
+
+probe process("beam").mark("efile_drv-return")
+{
+ if ($arg5 == 0) {
+ /* efile_drv-return error case */
+ printf("efile_drv return tag={%d,%d} %s%s | %s (%d) | errno %d\n",
+ $arg1, $arg2,
+ $arg3 == NULL ? "" : "user tag ",
+ $arg3 == NULL ? "" : user_string($arg3),
+ op_map[$arg4], $arg4,
+ $arg6);
+ } else {
+ /* efile_drv-return success case */
+ printf("efile_drv return tag={%d,%d} %s | %s (%d) ok\n",
+ $arg1, $arg2,
+ $arg3 == NULL ? "" : user_string($arg3),
+ op_map[$arg4], $arg4);
+ }
+}
+
+global op_map;