perfmon.c revision 253749 
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 * $FreeBSD: head/share/examples/perfmon/perfmon.c 253749 2013-07-28 18:35:43Z avg $
30 */
31
32#include <sys/types.h>
33#include <sys/ioctl.h>
34
35#include <machine/perfmon.h>
36
37#include <stdio.h>
38#include <stdlib.h>
39#include <string.h>
40#include <err.h>
41#include <unistd.h>
42#include <fcntl.h>
43#include <limits.h>
44#include <errno.h>
45
46static int getnum(const char *, int, int);
47static void usage(const char *) __dead2;
48
49int
50main(int argc, char **argv)
51{
52	int c, fd, num;
53	int loops, i, sleeptime;
54	char *cmd;
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	cmd = NULL;
67	loops = 50;
68	sleeptime = 0;
69
70	while ((c = getopt(argc, argv, "s:l:uoeiU:m:c:")) != -1) {
71		switch(c) {
72		case 'u':
73			pmc.pmc_flags |= PMCF_USR;
74			break;
75		case 'o':
76			pmc.pmc_flags |= PMCF_OS;
77			break;
78		case 'e':
79			pmc.pmc_flags |= PMCF_E;
80			break;
81		case 'i':
82			pmc.pmc_flags |= PMCF_INV;
83			break;
84		case 'U':
85			pmc.pmc_unit = getnum(optarg, 0, 256);
86			break;
87		case 'm':
88			pmc.pmc_mask = getnum(optarg, 0, 256);
89			break;
90		case 'l':
91			loops = getnum(optarg, 1, INT_MAX - 1);
92			break;
93		case 's':
94			sleeptime = getnum(optarg, 0, INT_MAX - 1);
95			break;
96		case 'c':
97			cmd = optarg;
98			break;
99		default:
100			usage(argv[0]);
101		}
102	}
103
104	if (argc - optind != 1)
105		usage(argv[0]);
106
107	pmc.pmc_event = getnum(argv[optind], 0, 255);
108
109	buf = malloc((loops + 1) * sizeof *buf);
110	if (!buf)
111		err(1, "malloc(%lu)", (unsigned long)(loops +1) * sizeof *buf);
112
113	fd = open(_PATH_PERFMON, O_RDWR, 0);
114	if (fd < 0)
115		err(1, "open: " _PATH_PERFMON);
116
117	if (ioctl(fd, PMIOSETUP, &pmc) < 0)
118		err(1, "ioctl(PMIOSETUP)");
119
120	if (ioctl(fd, PMIOTSTAMP, &then) < 0)
121		err(1, "ioctl(PMIOTSTAMP)");
122
123	num = 0;
124	if (ioctl(fd, PMIOSTART, &num) < 0)
125		err(1, "ioctl(PMIOSTART)");
126
127	value.pmcd_num = 0;
128	for (i = 0; i < loops; i++) {
129		if (ioctl(fd, PMIOSTOP, &num) < 0)
130			err(1, "ioctl(PMIOSTOP)");
131		if (ioctl(fd, PMIOREAD, &value) < 0)
132			err(1, "ioctl(PMIOREAD)");
133		buf[i] = value.pmcd_value;
134		if (ioctl(fd, PMIORESET, &value.pmcd_num) < 0)
135			err(1, "ioctl(PMIORESET)");
136		if (ioctl(fd, PMIOSTART, &num) < 0)
137			err(1, "ioctl(PMIOSTART)");
138		if (sleeptime)
139			sleep(sleeptime);
140		if (cmd)
141			system(cmd);
142	}
143
144	if (ioctl(fd, PMIOSTOP, &num) < 0)
145		err(1, "ioctl(PMIOSTOP)");
146	if (ioctl(fd, PMIOREAD, &value) < 0)
147		err(1, "ioctl(PMIOREAD)");
148	buf[i] = value.pmcd_value;
149	if (ioctl(fd, PMIOTSTAMP, &now) < 0)
150		err(1, "ioctl(PMIOTSTAMP)");
151
152	total = 0;
153	for (i = 1; i <= loops; i++) {
154		printf("%d: %qd\n", i, buf[i]);
155		total += buf[i];
156	}
157	printf("total: %f\nmean: %f\n", total, total / loops);
158
159	printf("clocks (at %d-MHz): %qd\n", now.pmct_rate,
160	       now.pmct_value - then.pmct_value);
161
162	return 0;
163}
164
165static int
166getnum(const char *buf, int min, int max)
167{
168	char *ep;
169	long l;
170
171	errno = 0;
172	l = strtol(buf, &ep, 0);
173	if (*buf && !*ep && !errno) {
174		if (l < min || l > max) {
175			errx(1, "%s: must be between %d and %d",
176			     buf, min, max);
177		}
178		return (int)l;
179	}
180
181	errx(1, "%s: parameter must be an integer", buf);
182}
183
184static void
185usage(const char *pname)
186{
187	fprintf(stderr,
188	"usage: %s [-eiou] [-c command] [-l nloops] [-m mask] [-s sleeptime]\n"
189	"       [-U unit] counter\n",
190		pname);
191	exit(1);
192}
193