tprof.c revision 1.10 
1/*	$NetBSD: tprof.c,v 1.10 2018/07/13 19:54:53 joerg Exp $	*/
2
3/*
4 * Copyright (c) 2018 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Maxime Villard.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32/*
33 * Copyright (c)2008 YAMAMOTO Takashi,
34 * All rights reserved.
35 *
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
38 * are met:
39 * 1. Redistributions of source code must retain the above copyright
40 *    notice, this list of conditions and the following disclaimer.
41 * 2. Redistributions in binary form must reproduce the above copyright
42 *    notice, this list of conditions and the following disclaimer in the
43 *    documentation and/or other materials provided with the distribution.
44 *
45 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
46 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
47 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
48 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
49 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
50 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
51 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
52 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
53 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
54 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
55 * SUCH DAMAGE.
56 */
57
58#include <sys/cdefs.h>
59#ifndef lint
60__RCSID("$NetBSD: tprof.c,v 1.10 2018/07/13 19:54:53 joerg Exp $");
61#endif /* not lint */
62
63#include <sys/ioctl.h>
64#include <sys/wait.h>
65
66#include <dev/tprof/tprof_ioctl.h>
67
68#include <err.h>
69#include <errno.h>
70#include <fcntl.h>
71#include <inttypes.h>
72#include <pthread.h>
73#include <signal.h>
74#include <stdbool.h>
75#include <stdio.h>
76#include <stdlib.h>
77#include <string.h>
78#include <unistd.h>
79#include "tprof.h"
80
81#define	_PATH_TPROF	"/dev/tprof"
82
83int devfd;
84int outfd;
85
86static void tprof_list(int, char **);
87static void tprof_monitor(int, char **) __dead;
88
89static struct cmdtab {
90	const char *label;
91	bool takesargs;
92	bool argsoptional;
93	void (*func)(int, char **);
94} const tprof_cmdtab[] = {
95	{ "list",	false, false, tprof_list },
96	{ "monitor",	true,  false, tprof_monitor },
97	{ "analyze",	true,  true,  tprof_analyze },
98	{ NULL,		false, false, NULL },
99};
100
101__dead static void
102usage(void)
103{
104
105	fprintf(stderr, "%s op [arguments]\n", getprogname());
106	fprintf(stderr, "\n");
107	fprintf(stderr, "\tlist\n");
108	fprintf(stderr, "\t\tList the available events.\n");
109	fprintf(stderr, "\tmonitor -e name:option [-o outfile] command\n");
110	fprintf(stderr, "\t\tMonitor the event 'name' with option 'option'\n"
111	    "\t\tcounted during the execution of 'command'.\n");
112	fprintf(stderr, "\tanalyze [-C] [-k] [-L] [-P] [-p pid] [-s] file\n");
113	fprintf(stderr, "\t\tAnalyze the samples of the file 'file'.\n");
114
115	exit(EXIT_FAILURE);
116}
117
118static void *
119process_samples(void *dummy)
120{
121
122	for (;;) {
123		char buf[4096];
124		const char *cp;
125		ssize_t ssz;
126
127		ssz = read(devfd, buf, sizeof(buf));
128		if (ssz == -1) {
129			err(EXIT_FAILURE, "read");
130		}
131		if (ssz == 0) {
132			break;
133		}
134		cp = buf;
135		while (ssz) {
136			ssize_t wsz;
137
138			wsz = write(outfd, cp, ssz);
139			if (wsz == -1) {
140				err(EXIT_FAILURE, "write");
141			}
142			ssz -= wsz;
143			cp += wsz;
144		}
145	}
146	return NULL;
147}
148
149static void
150tprof_list(int argc, char **argv)
151{
152	tprof_event_list();
153}
154
155static void
156tprof_monitor(int argc, char **argv)
157{
158	const char *outfile = "tprof.out";
159	struct tprof_param param;
160	struct tprof_stat ts;
161	pid_t pid;
162	pthread_t pt;
163	int ret, ch;
164	char *tokens[2];
165
166	memset(&param, 0, sizeof(param));
167
168	while ((ch = getopt(argc, argv, "o:e:")) != -1) {
169		switch (ch) {
170		case 'o':
171			outfile = optarg;
172			break;
173		case 'e':
174			tokens[0] = strtok(optarg, ":");
175			tokens[1] = strtok(NULL, ":");
176			if (tokens[1] == NULL)
177				usage();
178			tprof_event_lookup(tokens[0], &param);
179			if (strchr(tokens[1], 'u'))
180				param.p_flags |= TPROF_PARAM_USER;
181			if (strchr(tokens[1], 'k'))
182				param.p_flags |= TPROF_PARAM_KERN;
183			break;
184		default:
185			usage();
186		}
187	}
188	argc -= optind;
189	argv += optind;
190	if (argc == 0) {
191		usage();
192	}
193
194	if (param.p_flags == 0) {
195		usage();
196	}
197
198	outfd = open(outfile, O_WRONLY | O_CREAT | O_TRUNC, 0666);
199	if (outfd == -1) {
200		err(EXIT_FAILURE, "%s", outfile);
201	}
202
203	ret = ioctl(devfd, TPROF_IOC_START, &param);
204	if (ret == -1) {
205		err(EXIT_FAILURE, "TPROF_IOC_START");
206	}
207
208	pid = fork();
209	switch (pid) {
210	case -1:
211		err(EXIT_FAILURE, "fork");
212	case 0:
213		close(devfd);
214		execvp(argv[0], argv);
215		_Exit(EXIT_FAILURE);
216	}
217
218	signal(SIGINT, SIG_IGN);
219
220	ret = pthread_create(&pt, NULL, process_samples, NULL);
221	if (ret != 0) {
222		errx(1, "pthread_create: %s", strerror(ret));
223	}
224
225	for (;;) {
226		int status;
227
228		pid = wait4(-1, &status, 0, NULL);
229		if (pid == -1) {
230			if (errno == ECHILD) {
231				break;
232			}
233			err(EXIT_FAILURE, "wait4");
234		}
235		if (pid != 0 && WIFEXITED(status)) {
236			break;
237		}
238	}
239
240	ret = ioctl(devfd, TPROF_IOC_STOP, NULL);
241	if (ret == -1) {
242		err(EXIT_FAILURE, "TPROF_IOC_STOP");
243	}
244
245	pthread_join(pt, NULL);
246
247	ret = ioctl(devfd, TPROF_IOC_GETSTAT, &ts);
248	if (ret == -1) {
249		err(EXIT_FAILURE, "TPROF_IOC_GETSTAT");
250	}
251
252	fprintf(stderr, "\n%s statistics:\n", getprogname());
253	fprintf(stderr, "\tsample %" PRIu64 "\n", ts.ts_sample);
254	fprintf(stderr, "\toverflow %" PRIu64 "\n", ts.ts_overflow);
255	fprintf(stderr, "\tbuf %" PRIu64 "\n", ts.ts_buf);
256	fprintf(stderr, "\temptybuf %" PRIu64 "\n", ts.ts_emptybuf);
257	fprintf(stderr, "\tdropbuf %" PRIu64 "\n", ts.ts_dropbuf);
258	fprintf(stderr, "\tdropbuf_sample %" PRIu64 "\n", ts.ts_dropbuf_sample);
259
260	exit(EXIT_SUCCESS);
261}
262
263int
264main(int argc, char *argv[])
265{
266	struct tprof_info info;
267	const struct cmdtab *ct;
268	int ret;
269
270	setprogname(argv[0]);
271	argv += 1, argc -= 1;
272
273	devfd = open(_PATH_TPROF, O_RDWR);
274	if (devfd == -1) {
275		err(EXIT_FAILURE, "%s", _PATH_TPROF);
276	}
277
278	ret = ioctl(devfd, TPROF_IOC_GETINFO, &info);
279	if (ret == -1) {
280		err(EXIT_FAILURE, "TPROF_IOC_GETINFO");
281	}
282	if (info.ti_version != TPROF_VERSION) {
283		errx(EXIT_FAILURE, "version mismatch: version=%d, expected=%d",
284		    info.ti_version, TPROF_VERSION);
285	}
286	if (tprof_event_init(info.ti_ident) == -1) {
287		err(EXIT_FAILURE, "cpu not supported");
288	}
289
290	for (ct = tprof_cmdtab; ct->label != NULL; ct++) {
291		if (strcmp(argv[0], ct->label) == 0) {
292			if (!ct->argsoptional &&
293			    ((ct->takesargs == 0) ^ (argv[1] == NULL)))
294			{
295				usage();
296			}
297			(*ct->func)(argc, argv);
298			break;
299		}
300	}
301	if (ct->label == NULL) {
302		usage();
303	}
304}
305