perfmon.c revision 22988 
1/*
2 * Copyright 1996 Massachusetts Institute of Technology
3 *
4 * Permission to use, copy, modify, and distribute this software and
5 * its documentation for any purpose and without fee is hereby
6 * granted, provided that both the above copyright notice and this
7 * permission notice appear in all copies, that both the above
8 * copyright notice and this permission notice appear in all
9 * supporting documentation, and that the name of M.I.T. not be used
10 * in advertising or publicity pertaining to distribution of the
11 * software without specific, written prior permission.  M.I.T. makes
12 * no representations about the suitability of this software for any
13 * purpose.  It is provided "as is" without express or implied
14 * warranty.
15 *
16 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''.  M.I.T. DISCLAIMS
17 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
18 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
20 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
23 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
26 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 *	$Id$
30 */
31
32#include <sys/types.h>
33#include <sys/ioctl.h>
34
35#include <machine/cpu.h>
36#include <machine/perfmon.h>
37
38#include <stdio.h>
39#include <stdlib.h>
40#include <string.h>
41#include <err.h>
42#include <unistd.h>
43#include <fcntl.h>
44#include <limits.h>
45#include <errno.h>
46
47static int getnum(const char *, int, int);
48static void __dead usage(const char *) __dead2;
49
50int
51main(int argc, char **argv)
52{
53	int c, fd, num;
54	int loops, i, sleeptime;
55	struct pmc pmc;
56	struct pmc_tstamp then, now;
57	struct pmc_data value;
58	quad_t *buf;
59	double total;
60
61	pmc.pmc_num = 0;
62	pmc.pmc_event = 0;
63	pmc.pmc_unit = 0;
64	pmc.pmc_flags = 0;
65	pmc.pmc_mask = 0;
66	loops = 50;
67	sleeptime = 0;
68
69	while ((c = getopt(argc, argv, "s:l:uoeiU:m:")) != EOF) {
70		switch(c) {
71		case 'u':
72			pmc.pmc_flags |= PMCF_USR;
73			break;
74		case 'o':
75			pmc.pmc_flags |= PMCF_OS;
76			break;
77		case 'e':
78			pmc.pmc_flags |= PMCF_E;
79			break;
80		case 'i':
81			pmc.pmc_flags |= PMCF_INV;
82			break;
83		case 'U':
84			pmc.pmc_unit = getnum(optarg, 0, 256);
85			break;
86		case 'm':
87			pmc.pmc_mask = getnum(optarg, 0, 256);
88			break;
89		case 'l':
90			loops = getnum(optarg, 1, INT_MAX - 1);
91			break;
92		case 's':
93			sleeptime = getnum(optarg, 0, INT_MAX - 1);
94			break;
95		default:
96			usage(argv[0]);
97		}
98	}
99
100	if (argc - optind != 1)
101		usage(argv[0]);
102
103	pmc.pmc_event = getnum(argv[optind], 0, 255);
104
105	buf = malloc((loops + 1) * sizeof *buf);
106	if (!buf)
107		err(1, "malloc(%lu)", (unsigned long)(loops +1) * sizeof *buf);
108
109	fd = open(_PATH_PERFMON, O_RDWR, 0);
110	if (fd < 0)
111		err(1, "open: " _PATH_PERFMON);
112
113	if (ioctl(fd, PMIOSETUP, &pmc) < 0)
114		err(1, "ioctl(PMIOSETUP)");
115
116	if (ioctl(fd, PMIOTSTAMP, &then) < 0)
117		err(1, "ioctl(PMIOTSTAMP)");
118
119	num = 0;
120	if (ioctl(fd, PMIOSTART, &num) < 0)
121		err(1, "ioctl(PMIOSTART)");
122
123	value.pmcd_num = 0;
124	for (i = 0; i < loops; i++) {
125		if (sleeptime)
126			sleep(sleeptime);
127		if (ioctl(fd, PMIOSTOP, &num) < 0)
128			err(1, "ioctl(PMIOSTOP)");
129		if (ioctl(fd, PMIOREAD, &value) < 0)
130			err(1, "ioctl(PMIOREAD)");
131		buf[i] = value.pmcd_value;
132		if (ioctl(fd, PMIORESET, &value.pmcd_num) < 0)
133			err(1, "ioctl(PMIORESET)");
134		if (ioctl(fd, PMIOSTART, &num) < 0)
135			err(1, "ioctl(PMIOSTART)");
136	}
137
138	if (ioctl(fd, PMIOSTOP, &num) < 0)
139		err(1, "ioctl(PMIOSTOP)");
140	if (ioctl(fd, PMIOREAD, &value) < 0)
141		err(1, "ioctl(PMIOREAD)");
142	buf[i] = value.pmcd_value;
143	if (ioctl(fd, PMIOTSTAMP, &now) < 0)
144		err(1, "ioctl(PMIOTSTAMP)");
145
146	total = 0;
147	for (i = 1; i <= loops; i++) {
148		printf("%d: %qd\n", i, buf[i]);
149		total += buf[i];
150	}
151	printf("total: %f\nmean: %f\n", total, total / loops);
152
153	printf("clocks (at %d-MHz): %qd\n", now.pmct_rate,
154	       now.pmct_value - then.pmct_value);
155
156	return 0;
157}
158
159static int
160getnum(const char *buf, int min, int max)
161{
162	char *ep;
163	long l;
164
165	errno = 0;
166	l = strtol(buf, &ep, 0);
167	if (*buf && !*ep && !errno) {
168		if (l < min || l > max) {
169			errx(1, "`%s': must be between %d and %d",
170			     buf, min, max);
171		}
172		return (int)l;
173	} else if(errno) {
174		errx(1, "`%s': must be between %ld and %ld",
175		     LONG_MIN, LONG_MAX);
176	}
177	errx(1, "`%s': parameter must be an integer");
178}
179
180static void
181usage(const char *pname)
182{
183	fprintf(stderr,
184		"%s: usage:\n\t%s [-eiou] [-l nloops] [-U unit] [-m mask] "
185		"counter\n", pname, pname);
186	exit(1);
187}
188