1#!/usr/sbin/dtrace -s
2/*-
3 * Copyright 2014 John-Mark Gurney.
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 *
27 */
28
29#pragma D option quiet
30
31/* from http://www.mail-archive.com/dtrace-discuss@opensolaris.org/msg03755.html */
32#pragma D option aggsize=8m
33#pragma D option bufsize=16m
34#pragma D option dynvarsize=32m
35/*
36#pragma D option aggrate=0
37#pragma D option cleanrate=50Hz
38*/
39
40dtrace:::BEGIN
41{
42	printf("Tracing... Hit Ctrl-C to end.\n");
43	dstart = timestamp;
44}
45
46io:::start
47{
48	start_time[arg0] = timestamp;
49}
50
51io:::done
52/this->start = start_time[arg0]/
53{
54	this->delta = (timestamp - this->start) / 1000;
55	@q[args[1]->device_name, args[1]->unit_number] =
56	    lquantize(this->delta, 4000, 80000, 4000);
57	@max[args[1]->device_name, args[1]->unit_number] = max(this->delta);
58	@avg[args[1]->device_name, args[1]->unit_number] = avg(this->delta);
59	@stddev[args[1]->device_name, args[1]->unit_number] = stddev(this->delta);
60	start_time[arg0] = 0;
61}
62
63dtrace:::END
64{
65	printf("total time, us: %d\n", (timestamp - dstart) / 1000);
66	printa("   %s (%d), us:\n%@d\n", @q);
67	printa("max%s (%d), us: %@d\n", @max);
68	printa("avg%s (%d), us: %@d\n", @avg);
69	printa("stddev%s (%d), us: %@d\n", @stddev);
70}
71