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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>
26
27#include <linux/genetlink.h>
28#include <linux/taskstats.h>
29#include <linux/cgroupstats.h>
30
31
32
33
34
35
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)
40
41#define err(code, fmt, arg...) \
42 do { \
43 fprintf(stderr, fmt, ##arg); \
44 exit(code); \
45 } while (0)
46
47int done;
48int rcvbufsz;
49char name[100];
50int dbg;
51int print_delays;
52int print_io_accounting;
53int print_task_context_switch_counts;
54
55#define PRINTF(fmt, arg...) { \
56 if (dbg) { \
57 printf(fmt, ##arg); \
58 } \
59 }
60
61
62#define MAX_MSG_SIZE 1024
63
64#define MAX_CPUS 32
65
66struct msgtemplate {
67 struct nlmsghdr n;
68 struct genlmsghdr g;
69 char buf[MAX_MSG_SIZE];
70};
71
72char cpumask[100+6*MAX_CPUS];
73
74static void usage(void)
75{
76 fprintf(stderr, "getdelays [-dilv] [-w logfile] [-r bufsize] "
77 "[-m cpumask] [-t tgid] [-p pid]\n");
78 fprintf(stderr, " -d: print delayacct stats\n");
79 fprintf(stderr, " -i: print IO accounting (works only with -p)\n");
80 fprintf(stderr, " -l: listen forever\n");
81 fprintf(stderr, " -v: debug on\n");
82 fprintf(stderr, " -C: container path\n");
83}
84
85
86
87
88static int create_nl_socket(int protocol)
89{
90 int fd;
91 struct sockaddr_nl local;
92
93 fd = socket(AF_NETLINK, SOCK_RAW, protocol);
94 if (fd < 0)
95 return -1;
96
97 if (rcvbufsz)
98 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF,
99 &rcvbufsz, sizeof(rcvbufsz)) < 0) {
100 fprintf(stderr, "Unable to set socket rcv buf size to %d\n",
101 rcvbufsz);
102 goto error;
103 }
104
105 memset(&local, 0, sizeof(local));
106 local.nl_family = AF_NETLINK;
107
108 if (bind(fd, (struct sockaddr *) &local, sizeof(local)) < 0)
109 goto error;
110
111 return fd;
112error:
113 close(fd);
114 return -1;
115}
116
117
118static int send_cmd(int sd, __u16 nlmsg_type, __u32 nlmsg_pid,
119 __u8 genl_cmd, __u16 nla_type,
120 void *nla_data, int nla_len)
121{
122 struct nlattr *na;
123 struct sockaddr_nl nladdr;
124 int r, buflen;
125 char *buf;
126
127 struct msgtemplate msg;
128
129 msg.n.nlmsg_len = NLMSG_LENGTH(GENL_HDRLEN);
130 msg.n.nlmsg_type = nlmsg_type;
131 msg.n.nlmsg_flags = NLM_F_REQUEST;
132 msg.n.nlmsg_seq = 0;
133 msg.n.nlmsg_pid = nlmsg_pid;
134 msg.g.cmd = genl_cmd;
135 msg.g.version = 0x1;
136 na = (struct nlattr *) GENLMSG_DATA(&msg);
137 na->nla_type = nla_type;
138 na->nla_len = nla_len + 1 + NLA_HDRLEN;
139 memcpy(NLA_DATA(na), nla_data, nla_len);
140 msg.n.nlmsg_len += NLMSG_ALIGN(na->nla_len);
141
142 buf = (char *) &msg;
143 buflen = msg.n.nlmsg_len ;
144 memset(&nladdr, 0, sizeof(nladdr));
145 nladdr.nl_family = AF_NETLINK;
146 while ((r = sendto(sd, buf, buflen, 0, (struct sockaddr *) &nladdr,
147 sizeof(nladdr))) < buflen) {
148 if (r > 0) {
149 buf += r;
150 buflen -= r;
151 } else if (errno != EAGAIN)
152 return -1;
153 }
154 return 0;
155}
156
157
158
159
160
161
162static int get_family_id(int sd)
163{
164 struct {
165 struct nlmsghdr n;
166 struct genlmsghdr g;
167 char buf[256];
168 } ans;
169
170 int id = 0, rc;
171 struct nlattr *na;
172 int rep_len;
173
174 strcpy(name, TASKSTATS_GENL_NAME);
175 rc = send_cmd(sd, GENL_ID_CTRL, getpid(), CTRL_CMD_GETFAMILY,
176 CTRL_ATTR_FAMILY_NAME, (void *)name,
177 strlen(TASKSTATS_GENL_NAME)+1);
178 if (rc < 0)
179 return 0;
180
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;
185
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);
190 }
191 return id;
192}
193
194#define average_ms(t, c) (t / 1000000ULL / (c ? c : 1))
195
196static void print_delayacct(struct taskstats *t)
197{
198 printf("\n\nCPU %15s%15s%15s%15s%15s\n"
199 " %15llu%15llu%15llu%15llu%15.3fms\n"
200 "IO %15s%15s%15s\n"
201 " %15llu%15llu%15llums\n"
202 "SWAP %15s%15s%15s\n"
203 " %15llu%15llu%15llums\n"
204 "RECLAIM %12s%15s%15s\n"
205 " %15llu%15llu%15llums\n",
206 "count", "real total", "virtual total",
207 "delay total", "delay average",
208 (unsigned long long)t->cpu_count,
209 (unsigned long long)t->cpu_run_real_total,
210 (unsigned long long)t->cpu_run_virtual_total,
211 (unsigned long long)t->cpu_delay_total,
212 average_ms((double)t->cpu_delay_total, t->cpu_count),
213 "count", "delay total", "delay average",
214 (unsigned long long)t->blkio_count,
215 (unsigned long long)t->blkio_delay_total,
216 average_ms(t->blkio_delay_total, t->blkio_count),
217 "count", "delay total", "delay average",
218 (unsigned long long)t->swapin_count,
219 (unsigned long long)t->swapin_delay_total,
220 average_ms(t->swapin_delay_total, t->swapin_count),
221 "count", "delay total", "delay average",
222 (unsigned long long)t->freepages_count,
223 (unsigned long long)t->freepages_delay_total,
224 average_ms(t->freepages_delay_total, t->freepages_count));
225}
226
227static void task_context_switch_counts(struct taskstats *t)
228{
229 printf("\n\nTask %15s%15s\n"
230 " %15llu%15llu\n",
231 "voluntary", "nonvoluntary",
232 (unsigned long long)t->nvcsw, (unsigned long long)t->nivcsw);
233}
234
235static void print_cgroupstats(struct cgroupstats *c)
236{
237 printf("sleeping %llu, blocked %llu, running %llu, stopped %llu, "
238 "uninterruptible %llu\n", (unsigned long long)c->nr_sleeping,
239 (unsigned long long)c->nr_io_wait,
240 (unsigned long long)c->nr_running,
241 (unsigned long long)c->nr_stopped,
242 (unsigned long long)c->nr_uninterruptible);
243}
244
245
246static void print_ioacct(struct taskstats *t)
247{
248 printf("%s: read=%llu, write=%llu, cancelled_write=%llu\n",
249 t->ac_comm,
250 (unsigned long long)t->read_bytes,
251 (unsigned long long)t->write_bytes,
252 (unsigned long long)t->cancelled_write_bytes);
253}
254
255int main(int argc, char *argv[])
256{
257 int c, rc, rep_len, aggr_len, len2;
258 int cmd_type = TASKSTATS_CMD_ATTR_UNSPEC;
259 __u16 id;
260 __u32 mypid;
261
262 struct nlattr *na;
263 int nl_sd = -1;
264 int len = 0;
265 pid_t tid = 0;
266 pid_t rtid = 0;
267
268 int fd = 0;
269 int count = 0;
270 int write_file = 0;
271 int maskset = 0;
272 char *logfile = NULL;
273 int loop = 0;
274 int containerset = 0;
275 char *containerpath = NULL;
276 int cfd = 0;
277 int forking = 0;
278 sigset_t sigset;
279
280 struct msgtemplate msg;
281
282 while (!forking) {
283 c = getopt(argc, argv, "qdiw:r:m:t:p:vlC:c:");
284 if (c < 0)
285 break;
286
287 switch (c) {
288 case 'd':
289 printf("print delayacct stats ON\n");
290 print_delays = 1;
291 break;
292 case 'i':
293 printf("printing IO accounting\n");
294 print_io_accounting = 1;
295 break;
296 case 'q':
297 printf("printing task/process context switch rates\n");
298 print_task_context_switch_counts = 1;
299 break;
300 case 'C':
301 containerset = 1;
302 containerpath = optarg;
303 break;
304 case 'w':
305 logfile = strdup(optarg);
306 printf("write to file %s\n", logfile);
307 write_file = 1;
308 break;
309 case 'r':
310 rcvbufsz = atoi(optarg);
311 printf("receive buf size %d\n", rcvbufsz);
312 if (rcvbufsz < 0)
313 err(1, "Invalid rcv buf size\n");
314 break;
315 case 'm':
316 strncpy(cpumask, optarg, sizeof(cpumask));
317 cpumask[sizeof(cpumask) - 1] = '\0';
318 maskset = 1;
319 printf("cpumask %s maskset %d\n", cpumask, maskset);
320 break;
321 case 't':
322 tid = atoi(optarg);
323 if (!tid)
324 err(1, "Invalid tgid\n");
325 cmd_type = TASKSTATS_CMD_ATTR_TGID;
326 break;
327 case 'p':
328 tid = atoi(optarg);
329 if (!tid)
330 err(1, "Invalid pid\n");
331 cmd_type = TASKSTATS_CMD_ATTR_PID;
332 break;
333 case 'c':
334
335
336 if (sigemptyset(&sigset) == -1)
337 err(1, "Failed to empty sigset");
338 if (sigaddset(&sigset, SIGCHLD))
339 err(1, "Failed to set sigchld in sigset");
340 sigprocmask(SIG_BLOCK, &sigset, NULL);
341
342
343 tid = fork();
344 if (tid < 0)
345 err(1, "Fork failed\n");
346 if (tid == 0)
347 if (execvp(argv[optind - 1],
348 &argv[optind - 1]) < 0)
349 exit(-1);
350
351
352 cmd_type = TASKSTATS_CMD_ATTR_PID;
353 forking = 1;
354 break;
355 case 'v':
356 printf("debug on\n");
357 dbg = 1;
358 break;
359 case 'l':
360 printf("listen forever\n");
361 loop = 1;
362 break;
363 default:
364 usage();
365 exit(-1);
366 }
367 }
368
369 if (write_file) {
370 fd = open(logfile, O_WRONLY | O_CREAT | O_TRUNC,
371 S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
372 if (fd == -1) {
373 perror("Cannot open output file\n");
374 exit(1);
375 }
376 }
377
378 nl_sd = create_nl_socket(NETLINK_GENERIC);
379 if (nl_sd < 0)
380 err(1, "error creating Netlink socket\n");
381
382
383 mypid = getpid();
384 id = get_family_id(nl_sd);
385 if (!id) {
386 fprintf(stderr, "Error getting family id, errno %d\n", errno);
387 goto err;
388 }
389 PRINTF("family id %d\n", id);
390
391 if (maskset) {
392 rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
393 TASKSTATS_CMD_ATTR_REGISTER_CPUMASK,
394 &cpumask, strlen(cpumask) + 1);
395 PRINTF("Sent register cpumask, retval %d\n", rc);
396 if (rc < 0) {
397 fprintf(stderr, "error sending register cpumask\n");
398 goto err;
399 }
400 }
401
402 if (tid && containerset) {
403 fprintf(stderr, "Select either -t or -C, not both\n");
404 goto err;
405 }
406
407
408
409
410
411 if (tid && forking) {
412 int sig_received;
413 sigwait(&sigset, &sig_received);
414 }
415
416 if (tid) {
417 rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
418 cmd_type, &tid, sizeof(__u32));
419 PRINTF("Sent pid/tgid, retval %d\n", rc);
420 if (rc < 0) {
421 fprintf(stderr, "error sending tid/tgid cmd\n");
422 goto done;
423 }
424 }
425
426 if (containerset) {
427 cfd = open(containerpath, O_RDONLY);
428 if (cfd < 0) {
429 perror("error opening container file");
430 goto err;
431 }
432 rc = send_cmd(nl_sd, id, mypid, CGROUPSTATS_CMD_GET,
433 CGROUPSTATS_CMD_ATTR_FD, &cfd, sizeof(__u32));
434 if (rc < 0) {
435 perror("error sending cgroupstats command");
436 goto err;
437 }
438 }
439 if (!maskset && !tid && !containerset) {
440 usage();
441 goto err;
442 }
443
444 do {
445 rep_len = recv(nl_sd, &msg, sizeof(msg), 0);
446 PRINTF("received %d bytes\n", rep_len);
447
448 if (rep_len < 0) {
449 fprintf(stderr, "nonfatal reply error: errno %d\n",
450 errno);
451 continue;
452 }
453 if (msg.n.nlmsg_type == NLMSG_ERROR ||
454 !NLMSG_OK((&msg.n), rep_len)) {
455 struct nlmsgerr *err = NLMSG_DATA(&msg);
456 fprintf(stderr, "fatal reply error, errno %d\n",
457 err->error);
458 goto done;
459 }
460
461 PRINTF("nlmsghdr size=%zu, nlmsg_len=%d, rep_len=%d\n",
462 sizeof(struct nlmsghdr), msg.n.nlmsg_len, rep_len);
463
464
465 rep_len = GENLMSG_PAYLOAD(&msg.n);
466
467 na = (struct nlattr *) GENLMSG_DATA(&msg);
468 len = 0;
469 while (len < rep_len) {
470 len += NLA_ALIGN(na->nla_len);
471 switch (na->nla_type) {
472 case TASKSTATS_TYPE_AGGR_TGID:
473
474 case TASKSTATS_TYPE_AGGR_PID:
475 aggr_len = NLA_PAYLOAD(na->nla_len);
476 len2 = 0;
477
478 na = (struct nlattr *) NLA_DATA(na);
479 done = 0;
480 while (len2 < aggr_len) {
481 switch (na->nla_type) {
482 case TASKSTATS_TYPE_PID:
483 rtid = *(int *) NLA_DATA(na);
484 if (print_delays)
485 printf("PID\t%d\n", rtid);
486 break;
487 case TASKSTATS_TYPE_TGID:
488 rtid = *(int *) NLA_DATA(na);
489 if (print_delays)
490 printf("TGID\t%d\n", rtid);
491 break;
492 case TASKSTATS_TYPE_STATS:
493 count++;
494 if (print_delays)
495 print_delayacct((struct taskstats *) NLA_DATA(na));
496 if (print_io_accounting)
497 print_ioacct((struct taskstats *) NLA_DATA(na));
498 if (print_task_context_switch_counts)
499 task_context_switch_counts((struct taskstats *) NLA_DATA(na));
500 if (fd) {
501 if (write(fd, NLA_DATA(na), na->nla_len) < 0) {
502 err(1,"write error\n");
503 }
504 }
505 if (!loop)
506 goto done;
507 break;
508 default:
509 fprintf(stderr, "Unknown nested"
510 " nla_type %d\n",
511 na->nla_type);
512 break;
513 }
514 len2 += NLA_ALIGN(na->nla_len);
515 na = (struct nlattr *) ((char *) na + len2);
516 }
517 break;
518
519 case CGROUPSTATS_TYPE_CGROUP_STATS:
520 print_cgroupstats(NLA_DATA(na));
521 break;
522 default:
523 fprintf(stderr, "Unknown nla_type %d\n",
524 na->nla_type);
525 case TASKSTATS_TYPE_NULL:
526 break;
527 }
528 na = (struct nlattr *) (GENLMSG_DATA(&msg) + len);
529 }
530 } while (loop);
531done:
532 if (maskset) {
533 rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
534 TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK,
535 &cpumask, strlen(cpumask) + 1);
536 printf("Sent deregister mask, retval %d\n", rc);
537 if (rc < 0)
538 err(rc, "error sending deregister cpumask\n");
539 }
540err:
541 close(nl_sd);
542 if (fd)
543 close(fd);
544 if (cfd)
545 close(cfd);
546 return 0;
547}
548
