PCI: add more checking to ICH region quirks
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / Documentation / accounting / getdelays.c
blobe9c77788a39d8f2c5c807b59295be6c3f1b3fea6
1 /* getdelays.c
3 * Utility to get per-pid and per-tgid delay accounting statistics
4 * Also illustrates usage of the taskstats interface
6 * Copyright (C) Shailabh Nagar, IBM Corp. 2005
7 * Copyright (C) Balbir Singh, IBM Corp. 2006
8 * Copyright (c) Jay Lan, SGI. 2006
10 * Compile with
11 * gcc -I/usr/src/linux/include getdelays.c -o getdelays
14 #include <stdio.h>
15 #include <stdlib.h>
16 #include <errno.h>
17 #include <unistd.h>
18 #include <poll.h>
19 #include <string.h>
20 #include <fcntl.h>
21 #include <sys/types.h>
22 #include <sys/stat.h>
23 #include <sys/socket.h>
24 #include <sys/wait.h>
25 #include <signal.h>
27 #include <linux/genetlink.h>
28 #include <linux/taskstats.h>
29 #include <linux/cgroupstats.h>
32 * Generic macros for dealing with netlink sockets. Might be duplicated
33 * elsewhere. It is recommended that commercial grade applications use
34 * libnl or libnetlink and use the interfaces provided by the library
36 #define GENLMSG_DATA(glh) ((void *)(NLMSG_DATA(glh) + GENL_HDRLEN))
37 #define GENLMSG_PAYLOAD(glh) (NLMSG_PAYLOAD(glh, 0) - GENL_HDRLEN)
38 #define NLA_DATA(na) ((void *)((char*)(na) + NLA_HDRLEN))
39 #define NLA_PAYLOAD(len) (len - NLA_HDRLEN)
41 #define err(code, fmt, arg...) \
42 do { \
43 fprintf(stderr, fmt, ##arg); \
44 exit(code); \
45 } while (0)
47 int done;
48 int rcvbufsz;
49 char name[100];
50 int dbg;
51 int print_delays;
52 int print_io_accounting;
53 int print_task_context_switch_counts;
54 __u64 stime, utime;
56 #define PRINTF(fmt, arg...) { \
57 if (dbg) { \
58 printf(fmt, ##arg); \
59 } \
62 /* Maximum size of response requested or message sent */
63 #define MAX_MSG_SIZE 1024
64 /* Maximum number of cpus expected to be specified in a cpumask */
65 #define MAX_CPUS 32
67 struct msgtemplate {
68 struct nlmsghdr n;
69 struct genlmsghdr g;
70 char buf[MAX_MSG_SIZE];
73 char cpumask[100+6*MAX_CPUS];
75 static void usage(void)
77 fprintf(stderr, "getdelays [-dilv] [-w logfile] [-r bufsize] "
78 "[-m cpumask] [-t tgid] [-p pid]\n");
79 fprintf(stderr, " -d: print delayacct stats\n");
80 fprintf(stderr, " -i: print IO accounting (works only with -p)\n");
81 fprintf(stderr, " -l: listen forever\n");
82 fprintf(stderr, " -v: debug on\n");
83 fprintf(stderr, " -C: container path\n");
87 * Create a raw netlink socket and bind
89 static int create_nl_socket(int protocol)
91 int fd;
92 struct sockaddr_nl local;
94 fd = socket(AF_NETLINK, SOCK_RAW, protocol);
95 if (fd < 0)
96 return -1;
98 if (rcvbufsz)
99 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF,
100 &rcvbufsz, sizeof(rcvbufsz)) < 0) {
101 fprintf(stderr, "Unable to set socket rcv buf size "
102 "to %d\n",
103 rcvbufsz);
104 return -1;
107 memset(&local, 0, sizeof(local));
108 local.nl_family = AF_NETLINK;
110 if (bind(fd, (struct sockaddr *) &local, sizeof(local)) < 0)
111 goto error;
113 return fd;
114 error:
115 close(fd);
116 return -1;
120 static int send_cmd(int sd, __u16 nlmsg_type, __u32 nlmsg_pid,
121 __u8 genl_cmd, __u16 nla_type,
122 void *nla_data, int nla_len)
124 struct nlattr *na;
125 struct sockaddr_nl nladdr;
126 int r, buflen;
127 char *buf;
129 struct msgtemplate msg;
131 msg.n.nlmsg_len = NLMSG_LENGTH(GENL_HDRLEN);
132 msg.n.nlmsg_type = nlmsg_type;
133 msg.n.nlmsg_flags = NLM_F_REQUEST;
134 msg.n.nlmsg_seq = 0;
135 msg.n.nlmsg_pid = nlmsg_pid;
136 msg.g.cmd = genl_cmd;
137 msg.g.version = 0x1;
138 na = (struct nlattr *) GENLMSG_DATA(&msg);
139 na->nla_type = nla_type;
140 na->nla_len = nla_len + 1 + NLA_HDRLEN;
141 memcpy(NLA_DATA(na), nla_data, nla_len);
142 msg.n.nlmsg_len += NLMSG_ALIGN(na->nla_len);
144 buf = (char *) &msg;
145 buflen = msg.n.nlmsg_len ;
146 memset(&nladdr, 0, sizeof(nladdr));
147 nladdr.nl_family = AF_NETLINK;
148 while ((r = sendto(sd, buf, buflen, 0, (struct sockaddr *) &nladdr,
149 sizeof(nladdr))) < buflen) {
150 if (r > 0) {
151 buf += r;
152 buflen -= r;
153 } else if (errno != EAGAIN)
154 return -1;
156 return 0;
161 * Probe the controller in genetlink to find the family id
162 * for the TASKSTATS family
164 static int get_family_id(int sd)
166 struct {
167 struct nlmsghdr n;
168 struct genlmsghdr g;
169 char buf[256];
170 } ans;
172 int id = 0, rc;
173 struct nlattr *na;
174 int rep_len;
176 strcpy(name, TASKSTATS_GENL_NAME);
177 rc = send_cmd(sd, GENL_ID_CTRL, getpid(), CTRL_CMD_GETFAMILY,
178 CTRL_ATTR_FAMILY_NAME, (void *)name,
179 strlen(TASKSTATS_GENL_NAME)+1);
181 rep_len = recv(sd, &ans, sizeof(ans), 0);
182 if (ans.n.nlmsg_type == NLMSG_ERROR ||
183 (rep_len < 0) || !NLMSG_OK((&ans.n), rep_len))
184 return 0;
186 na = (struct nlattr *) GENLMSG_DATA(&ans);
187 na = (struct nlattr *) ((char *) na + NLA_ALIGN(na->nla_len));
188 if (na->nla_type == CTRL_ATTR_FAMILY_ID) {
189 id = *(__u16 *) NLA_DATA(na);
191 return id;
194 static void print_delayacct(struct taskstats *t)
196 printf("\n\nCPU %15s%15s%15s%15s\n"
197 " %15llu%15llu%15llu%15llu\n"
198 "IO %15s%15s\n"
199 " %15llu%15llu\n"
200 "SWAP %15s%15s\n"
201 " %15llu%15llu\n"
202 "RECLAIM %12s%15s\n"
203 " %15llu%15llu\n",
204 "count", "real total", "virtual total", "delay total",
205 (unsigned long long)t->cpu_count,
206 (unsigned long long)t->cpu_run_real_total,
207 (unsigned long long)t->cpu_run_virtual_total,
208 (unsigned long long)t->cpu_delay_total,
209 "count", "delay total",
210 (unsigned long long)t->blkio_count,
211 (unsigned long long)t->blkio_delay_total,
212 "count", "delay total",
213 (unsigned long long)t->swapin_count,
214 (unsigned long long)t->swapin_delay_total,
215 "count", "delay total",
216 (unsigned long long)t->freepages_count,
217 (unsigned long long)t->freepages_delay_total);
220 static void task_context_switch_counts(struct taskstats *t)
222 printf("\n\nTask %15s%15s\n"
223 " %15llu%15llu\n",
224 "voluntary", "nonvoluntary",
225 (unsigned long long)t->nvcsw, (unsigned long long)t->nivcsw);
228 static void print_cgroupstats(struct cgroupstats *c)
230 printf("sleeping %llu, blocked %llu, running %llu, stopped %llu, "
231 "uninterruptible %llu\n", (unsigned long long)c->nr_sleeping,
232 (unsigned long long)c->nr_io_wait,
233 (unsigned long long)c->nr_running,
234 (unsigned long long)c->nr_stopped,
235 (unsigned long long)c->nr_uninterruptible);
239 static void print_ioacct(struct taskstats *t)
241 printf("%s: read=%llu, write=%llu, cancelled_write=%llu\n",
242 t->ac_comm,
243 (unsigned long long)t->read_bytes,
244 (unsigned long long)t->write_bytes,
245 (unsigned long long)t->cancelled_write_bytes);
248 int main(int argc, char *argv[])
250 int c, rc, rep_len, aggr_len, len2;
251 int cmd_type = TASKSTATS_CMD_ATTR_UNSPEC;
252 __u16 id;
253 __u32 mypid;
255 struct nlattr *na;
256 int nl_sd = -1;
257 int len = 0;
258 pid_t tid = 0;
259 pid_t rtid = 0;
261 int fd = 0;
262 int count = 0;
263 int write_file = 0;
264 int maskset = 0;
265 char *logfile = NULL;
266 int loop = 0;
267 int containerset = 0;
268 char containerpath[1024];
269 int cfd = 0;
270 int forking = 0;
271 sigset_t sigset;
273 struct msgtemplate msg;
275 while (!forking) {
276 c = getopt(argc, argv, "qdiw:r:m:t:p:vlC:c:");
277 if (c < 0)
278 break;
280 switch (c) {
281 case 'd':
282 printf("print delayacct stats ON\n");
283 print_delays = 1;
284 break;
285 case 'i':
286 printf("printing IO accounting\n");
287 print_io_accounting = 1;
288 break;
289 case 'q':
290 printf("printing task/process context switch rates\n");
291 print_task_context_switch_counts = 1;
292 break;
293 case 'C':
294 containerset = 1;
295 strncpy(containerpath, optarg, strlen(optarg) + 1);
296 break;
297 case 'w':
298 logfile = strdup(optarg);
299 printf("write to file %s\n", logfile);
300 write_file = 1;
301 break;
302 case 'r':
303 rcvbufsz = atoi(optarg);
304 printf("receive buf size %d\n", rcvbufsz);
305 if (rcvbufsz < 0)
306 err(1, "Invalid rcv buf size\n");
307 break;
308 case 'm':
309 strncpy(cpumask, optarg, sizeof(cpumask));
310 maskset = 1;
311 printf("cpumask %s maskset %d\n", cpumask, maskset);
312 break;
313 case 't':
314 tid = atoi(optarg);
315 if (!tid)
316 err(1, "Invalid tgid\n");
317 cmd_type = TASKSTATS_CMD_ATTR_TGID;
318 break;
319 case 'p':
320 tid = atoi(optarg);
321 if (!tid)
322 err(1, "Invalid pid\n");
323 cmd_type = TASKSTATS_CMD_ATTR_PID;
324 break;
325 case 'c':
327 /* Block SIGCHLD for sigwait() later */
328 if (sigemptyset(&sigset) == -1)
329 err(1, "Failed to empty sigset");
330 if (sigaddset(&sigset, SIGCHLD))
331 err(1, "Failed to set sigchld in sigset");
332 sigprocmask(SIG_BLOCK, &sigset, NULL);
334 /* fork/exec a child */
335 tid = fork();
336 if (tid < 0)
337 err(1, "Fork failed\n");
338 if (tid == 0)
339 if (execvp(argv[optind - 1],
340 &argv[optind - 1]) < 0)
341 exit(-1);
343 /* Set the command type and avoid further processing */
344 cmd_type = TASKSTATS_CMD_ATTR_PID;
345 forking = 1;
346 break;
347 case 'v':
348 printf("debug on\n");
349 dbg = 1;
350 break;
351 case 'l':
352 printf("listen forever\n");
353 loop = 1;
354 break;
355 default:
356 usage();
357 exit(-1);
361 if (write_file) {
362 fd = open(logfile, O_WRONLY | O_CREAT | O_TRUNC,
363 S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
364 if (fd == -1) {
365 perror("Cannot open output file\n");
366 exit(1);
370 if ((nl_sd = create_nl_socket(NETLINK_GENERIC)) < 0)
371 err(1, "error creating Netlink socket\n");
374 mypid = getpid();
375 id = get_family_id(nl_sd);
376 if (!id) {
377 fprintf(stderr, "Error getting family id, errno %d\n", errno);
378 goto err;
380 PRINTF("family id %d\n", id);
382 if (maskset) {
383 rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
384 TASKSTATS_CMD_ATTR_REGISTER_CPUMASK,
385 &cpumask, strlen(cpumask) + 1);
386 PRINTF("Sent register cpumask, retval %d\n", rc);
387 if (rc < 0) {
388 fprintf(stderr, "error sending register cpumask\n");
389 goto err;
393 if (tid && containerset) {
394 fprintf(stderr, "Select either -t or -C, not both\n");
395 goto err;
399 * If we forked a child, wait for it to exit. Cannot use waitpid()
400 * as all the delicious data would be reaped as part of the wait
402 if (tid && forking) {
403 int sig_received;
404 sigwait(&sigset, &sig_received);
407 if (tid) {
408 rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
409 cmd_type, &tid, sizeof(__u32));
410 PRINTF("Sent pid/tgid, retval %d\n", rc);
411 if (rc < 0) {
412 fprintf(stderr, "error sending tid/tgid cmd\n");
413 goto done;
417 if (containerset) {
418 cfd = open(containerpath, O_RDONLY);
419 if (cfd < 0) {
420 perror("error opening container file");
421 goto err;
423 rc = send_cmd(nl_sd, id, mypid, CGROUPSTATS_CMD_GET,
424 CGROUPSTATS_CMD_ATTR_FD, &cfd, sizeof(__u32));
425 if (rc < 0) {
426 perror("error sending cgroupstats command");
427 goto err;
430 if (!maskset && !tid && !containerset) {
431 usage();
432 goto err;
435 do {
436 int i;
438 rep_len = recv(nl_sd, &msg, sizeof(msg), 0);
439 PRINTF("received %d bytes\n", rep_len);
441 if (rep_len < 0) {
442 fprintf(stderr, "nonfatal reply error: errno %d\n",
443 errno);
444 continue;
446 if (msg.n.nlmsg_type == NLMSG_ERROR ||
447 !NLMSG_OK((&msg.n), rep_len)) {
448 struct nlmsgerr *err = NLMSG_DATA(&msg);
449 fprintf(stderr, "fatal reply error, errno %d\n",
450 err->error);
451 goto done;
454 PRINTF("nlmsghdr size=%zu, nlmsg_len=%d, rep_len=%d\n",
455 sizeof(struct nlmsghdr), msg.n.nlmsg_len, rep_len);
458 rep_len = GENLMSG_PAYLOAD(&msg.n);
460 na = (struct nlattr *) GENLMSG_DATA(&msg);
461 len = 0;
462 i = 0;
463 while (len < rep_len) {
464 len += NLA_ALIGN(na->nla_len);
465 switch (na->nla_type) {
466 case TASKSTATS_TYPE_AGGR_TGID:
467 /* Fall through */
468 case TASKSTATS_TYPE_AGGR_PID:
469 aggr_len = NLA_PAYLOAD(na->nla_len);
470 len2 = 0;
471 /* For nested attributes, na follows */
472 na = (struct nlattr *) NLA_DATA(na);
473 done = 0;
474 while (len2 < aggr_len) {
475 switch (na->nla_type) {
476 case TASKSTATS_TYPE_PID:
477 rtid = *(int *) NLA_DATA(na);
478 if (print_delays)
479 printf("PID\t%d\n", rtid);
480 break;
481 case TASKSTATS_TYPE_TGID:
482 rtid = *(int *) NLA_DATA(na);
483 if (print_delays)
484 printf("TGID\t%d\n", rtid);
485 break;
486 case TASKSTATS_TYPE_STATS:
487 count++;
488 if (print_delays)
489 print_delayacct((struct taskstats *) NLA_DATA(na));
490 if (print_io_accounting)
491 print_ioacct((struct taskstats *) NLA_DATA(na));
492 if (print_task_context_switch_counts)
493 task_context_switch_counts((struct taskstats *) NLA_DATA(na));
494 if (fd) {
495 if (write(fd, NLA_DATA(na), na->nla_len) < 0) {
496 err(1,"write error\n");
499 if (!loop)
500 goto done;
501 break;
502 default:
503 fprintf(stderr, "Unknown nested"
504 " nla_type %d\n",
505 na->nla_type);
506 break;
508 len2 += NLA_ALIGN(na->nla_len);
509 na = (struct nlattr *) ((char *) na + len2);
511 break;
513 case CGROUPSTATS_TYPE_CGROUP_STATS:
514 print_cgroupstats(NLA_DATA(na));
515 break;
516 default:
517 fprintf(stderr, "Unknown nla_type %d\n",
518 na->nla_type);
519 case TASKSTATS_TYPE_NULL:
520 break;
522 na = (struct nlattr *) (GENLMSG_DATA(&msg) + len);
524 } while (loop);
525 done:
526 if (maskset) {
527 rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
528 TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK,
529 &cpumask, strlen(cpumask) + 1);
530 printf("Sent deregister mask, retval %d\n", rc);
531 if (rc < 0)
532 err(rc, "error sending deregister cpumask\n");
534 err:
535 close(nl_sd);
536 if (fd)
537 close(fd);
538 if (cfd)
539 close(cfd);
540 return 0;