1 // SPDX-License-Identifier: GPL-2.0
2 /* getdelays.c
3 *
4 * Utility to get per-pid and per-tgid delay accounting statistics
5 * Also illustrates usage of the taskstats interface
6 *
7 * Copyright (C) Shailabh Nagar, IBM Corp. 2005
8 * Copyright (C) Balbir Singh, IBM Corp. 2006
9 * Copyright (c) Jay Lan, SGI. 2006
10 *
11 * Compile with
12 * gcc -I/usr/src/linux/include getdelays.c -o getdelays
13 */
14
15 #include <stdio.h>
16 #include <stdlib.h>
17 #include <errno.h>
18 #include <unistd.h>
19 #include <poll.h>
20 #include <string.h>
21 #include <fcntl.h>
22 #include <sys/types.h>
23 #include <sys/stat.h>
24 #include <sys/socket.h>
25 #include <sys/wait.h>
26 #include <signal.h>
27 #include <time.h>
28
29 #include <linux/genetlink.h>
30 #include <linux/taskstats.h>
31 #include <linux/cgroupstats.h>
32
33 /*
34 * Generic macros for dealing with netlink sockets. Might be duplicated
35 * elsewhere. It is recommended that commercial grade applications use
36 * libnl or libnetlink and use the interfaces provided by the library
37 */
38 #define GENLMSG_DATA(glh) ((void *)(NLMSG_DATA(glh) + GENL_HDRLEN))
39 #define GENLMSG_PAYLOAD(glh) (NLMSG_PAYLOAD(glh, 0) - GENL_HDRLEN)
40 #define NLA_DATA(na) ((void *)((char*)(na) + NLA_HDRLEN))
41 #define NLA_PAYLOAD(len) (len - NLA_HDRLEN)
42
43 #define err(code, fmt, arg...) \
44 do { \
45 fprintf(stderr, fmt, ##arg); \
46 exit(code); \
47 } while (0)
48
49 int rcvbufsz;
50 char name[100];
51 int dbg;
52 int print_delays;
53 int print_io_accounting;
54 int print_task_context_switch_counts;
55
56 #define PRINTF(fmt, arg...) { \
57 if (dbg) { \
58 printf(fmt, ##arg); \
59 } \
60 }
61
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
66
67 struct msgtemplate {
68 struct nlmsghdr n;
69 struct genlmsghdr g;
70 char buf[MAX_MSG_SIZE];
71 };
72
73 char cpumask[100+6*MAX_CPUS];
74
usage(void)75 static void usage(void)
76 {
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");
84 }
85
86 /*
87 * Create a raw netlink socket and bind
88 */
create_nl_socket(int protocol)89 static int create_nl_socket(int protocol)
90 {
91 int fd;
92 struct sockaddr_nl local;
93
94 fd = socket(AF_NETLINK, SOCK_RAW, protocol);
95 if (fd < 0)
96 return -1;
97
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 to %d\n",
102 rcvbufsz);
103 goto error;
104 }
105
106 memset(&local, 0, sizeof(local));
107 local.nl_family = AF_NETLINK;
108
109 if (bind(fd, (struct sockaddr *) &local, sizeof(local)) < 0)
110 goto error;
111
112 return fd;
113 error:
114 close(fd);
115 return -1;
116 }
117
118
send_cmd(int sd,__u16 nlmsg_type,__u32 nlmsg_pid,__u8 genl_cmd,__u16 nla_type,void * nla_data,int nla_len)119 static int send_cmd(int sd, __u16 nlmsg_type, __u32 nlmsg_pid,
120 __u8 genl_cmd, __u16 nla_type,
121 void *nla_data, int nla_len)
122 {
123 struct nlattr *na;
124 struct sockaddr_nl nladdr;
125 int r, buflen;
126 char *buf;
127
128 struct msgtemplate msg;
129
130 msg.n.nlmsg_len = NLMSG_LENGTH(GENL_HDRLEN);
131 msg.n.nlmsg_type = nlmsg_type;
132 msg.n.nlmsg_flags = NLM_F_REQUEST;
133 msg.n.nlmsg_seq = 0;
134 msg.n.nlmsg_pid = nlmsg_pid;
135 msg.g.cmd = genl_cmd;
136 msg.g.version = 0x1;
137 na = (struct nlattr *) GENLMSG_DATA(&msg);
138 na->nla_type = nla_type;
139 na->nla_len = nla_len + NLA_HDRLEN;
140 memcpy(NLA_DATA(na), nla_data, nla_len);
141 msg.n.nlmsg_len += NLMSG_ALIGN(na->nla_len);
142
143 buf = (char *) &msg;
144 buflen = msg.n.nlmsg_len ;
145 memset(&nladdr, 0, sizeof(nladdr));
146 nladdr.nl_family = AF_NETLINK;
147 while ((r = sendto(sd, buf, buflen, 0, (struct sockaddr *) &nladdr,
148 sizeof(nladdr))) < buflen) {
149 if (r > 0) {
150 buf += r;
151 buflen -= r;
152 } else if (errno != EAGAIN)
153 return -1;
154 }
155 return 0;
156 }
157
158
159 /*
160 * Probe the controller in genetlink to find the family id
161 * for the TASKSTATS family
162 */
get_family_id(int sd)163 static int get_family_id(int sd)
164 {
165 struct {
166 struct nlmsghdr n;
167 struct genlmsghdr g;
168 char buf[256];
169 } ans;
170
171 int id = 0, rc;
172 struct nlattr *na;
173 int rep_len;
174
175 strcpy(name, TASKSTATS_GENL_NAME);
176 rc = send_cmd(sd, GENL_ID_CTRL, getpid(), CTRL_CMD_GETFAMILY,
177 CTRL_ATTR_FAMILY_NAME, (void *)name,
178 strlen(TASKSTATS_GENL_NAME)+1);
179 if (rc < 0)
180 return 0; /* sendto() failure? */
181
182 rep_len = recv(sd, &ans, sizeof(ans), 0);
183 if (ans.n.nlmsg_type == NLMSG_ERROR ||
184 (rep_len < 0) || !NLMSG_OK((&ans.n), rep_len))
185 return 0;
186
187 na = (struct nlattr *) GENLMSG_DATA(&ans);
188 na = (struct nlattr *) ((char *) na + NLA_ALIGN(na->nla_len));
189 if (na->nla_type == CTRL_ATTR_FAMILY_ID) {
190 id = *(__u16 *) NLA_DATA(na);
191 }
192 return id;
193 }
194
195 #define average_ms(t, c) (t / 1000000ULL / (c ? c : 1))
196 #define delay_ms(t) (t / 1000000ULL)
197
198 /*
199 * Format __kernel_timespec to human readable string (YYYY-MM-DD HH:MM:SS)
200 * Returns formatted string or "N/A" if timestamp is zero
201 */
format_timespec(struct __kernel_timespec * ts)202 static const char *format_timespec(struct __kernel_timespec *ts)
203 {
204 static char buffer[32];
205 struct tm tm_info;
206 __kernel_time_t time_sec;
207
208 /* Check if timestamp is zero (not set) */
209 if (ts->tv_sec == 0 && ts->tv_nsec == 0)
210 return "N/A";
211
212 time_sec = ts->tv_sec;
213
214 /* Use thread-safe localtime_r */
215 if (localtime_r(&time_sec, &tm_info) == NULL)
216 return "N/A";
217
218 snprintf(buffer, sizeof(buffer), "%04d-%02d-%02dT%02d:%02d:%02d",
219 tm_info.tm_year + 1900,
220 tm_info.tm_mon + 1,
221 tm_info.tm_mday,
222 tm_info.tm_hour,
223 tm_info.tm_min,
224 tm_info.tm_sec);
225
226 return buffer;
227 }
228
229 /*
230 * Version compatibility note:
231 * Field availability depends on taskstats version (t->version),
232 * corresponding to TASKSTATS_VERSION in kernel headers
233 * see include/uapi/linux/taskstats.h
234 *
235 * Version feature mapping:
236 * version >= 11 - supports COMPACT statistics
237 * version >= 13 - supports WPCOPY statistics
238 * version >= 14 - supports IRQ statistics
239 * version >= 16 - supports *_max and *_min delay statistics
240 * version >= 17 - supports delay max timestamp statistics
241 *
242 * Always verify version before accessing version-dependent fields
243 * to maintain backward compatibility.
244 */
245 #define PRINT_CPU_DELAY(version, t) \
246 do { \
247 if (version >= 17) { \
248 printf("%-10s%15s%15s%15s%15s%15s%15s%15s%25s\n", \
249 "CPU", "count", "real total", "virtual total", \
250 "delay total", "delay average", "delay max", \
251 "delay min", "delay max timestamp"); \
252 printf(" %15llu%15llu%15llu%15llu%15.3fms%13.6fms%13.6fms%23s\n", \
253 (unsigned long long)(t)->cpu_count, \
254 (unsigned long long)(t)->cpu_run_real_total, \
255 (unsigned long long)(t)->cpu_run_virtual_total, \
256 (unsigned long long)(t)->cpu_delay_total, \
257 average_ms((double)(t)->cpu_delay_total, (t)->cpu_count), \
258 delay_ms((double)(t)->cpu_delay_max), \
259 delay_ms((double)(t)->cpu_delay_min), \
260 format_timespec(&(t)->cpu_delay_max_ts)); \
261 } else if (version >= 16) { \
262 printf("%-10s%15s%15s%15s%15s%15s%15s%15s\n", \
263 "CPU", "count", "real total", "virtual total", \
264 "delay total", "delay average", "delay max", "delay min"); \
265 printf(" %15llu%15llu%15llu%15llu%15.3fms%13.6fms%13.6fms\n", \
266 (unsigned long long)(t)->cpu_count, \
267 (unsigned long long)(t)->cpu_run_real_total, \
268 (unsigned long long)(t)->cpu_run_virtual_total, \
269 (unsigned long long)(t)->cpu_delay_total, \
270 average_ms((double)(t)->cpu_delay_total, (t)->cpu_count), \
271 delay_ms((double)(t)->cpu_delay_max), \
272 delay_ms((double)(t)->cpu_delay_min)); \
273 } else { \
274 printf("%-10s%15s%15s%15s%15s%15s\n", \
275 "CPU", "count", "real total", "virtual total", \
276 "delay total", "delay average"); \
277 printf(" %15llu%15llu%15llu%15llu%15.3fms\n", \
278 (unsigned long long)(t)->cpu_count, \
279 (unsigned long long)(t)->cpu_run_real_total, \
280 (unsigned long long)(t)->cpu_run_virtual_total, \
281 (unsigned long long)(t)->cpu_delay_total, \
282 average_ms((double)(t)->cpu_delay_total, (t)->cpu_count)); \
283 } \
284 } while (0)
285 #define PRINT_FILED_DELAY(name, version, t, count, total, max, min) \
286 do { \
287 if (version >= 16) { \
288 printf("%-10s%15s%15s%15s%15s%15s\n", \
289 name, "count", "delay total", "delay average", \
290 "delay max", "delay min"); \
291 printf(" %15llu%15llu%15.3fms%13.6fms%13.6fms\n", \
292 (unsigned long long)(t)->count, \
293 (unsigned long long)(t)->total, \
294 average_ms((double)(t)->total, (t)->count), \
295 delay_ms((double)(t)->max), \
296 delay_ms((double)(t)->min)); \
297 } else { \
298 printf("%-10s%15s%15s%15s\n", \
299 name, "count", "delay total", "delay average"); \
300 printf(" %15llu%15llu%15.3fms\n", \
301 (unsigned long long)(t)->count, \
302 (unsigned long long)(t)->total, \
303 average_ms((double)(t)->total, (t)->count)); \
304 } \
305 } while (0)
306
307 #define PRINT_FILED_DELAY_WITH_TS(name, version, t, count, total, max, min, max_ts) \
308 do { \
309 if (version >= 17) { \
310 printf("%-10s%15s%15s%15s%15s%15s%25s\n", \
311 name, "count", "delay total", "delay average", \
312 "delay max", "delay min", "delay max timestamp"); \
313 printf(" %15llu%15llu%15.3fms%13.6fms%13.6fms%23s\n", \
314 (unsigned long long)(t)->count, \
315 (unsigned long long)(t)->total, \
316 average_ms((double)(t)->total, (t)->count), \
317 delay_ms((double)(t)->max), \
318 delay_ms((double)(t)->min), \
319 format_timespec(&(t)->max_ts)); \
320 } else if (version >= 16) { \
321 printf("%-10s%15s%15s%15s%15s%15s\n", \
322 name, "count", "delay total", "delay average", \
323 "delay max", "delay min"); \
324 printf(" %15llu%15llu%15.3fms%13.6fms%13.6fms\n", \
325 (unsigned long long)(t)->count, \
326 (unsigned long long)(t)->total, \
327 average_ms((double)(t)->total, (t)->count), \
328 delay_ms((double)(t)->max), \
329 delay_ms((double)(t)->min)); \
330 } else { \
331 printf("%-10s%15s%15s%15s\n", \
332 name, "count", "delay total", "delay average"); \
333 printf(" %15llu%15llu%15.3fms\n", \
334 (unsigned long long)(t)->count, \
335 (unsigned long long)(t)->total, \
336 average_ms((double)(t)->total, (t)->count)); \
337 } \
338 } while (0)
339
print_delayacct(struct taskstats * t)340 static void print_delayacct(struct taskstats *t)
341 {
342 printf("\n\n");
343
344 PRINT_CPU_DELAY(t->version, t);
345
346 /* Use new macro with timestamp support for version >= 17 */
347 if (t->version >= 17) {
348 PRINT_FILED_DELAY_WITH_TS("IO", t->version, t,
349 blkio_count, blkio_delay_total,
350 blkio_delay_max, blkio_delay_min, blkio_delay_max_ts);
351
352 PRINT_FILED_DELAY_WITH_TS("SWAP", t->version, t,
353 swapin_count, swapin_delay_total,
354 swapin_delay_max, swapin_delay_min, swapin_delay_max_ts);
355
356 PRINT_FILED_DELAY_WITH_TS("RECLAIM", t->version, t,
357 freepages_count, freepages_delay_total,
358 freepages_delay_max, freepages_delay_min, freepages_delay_max_ts);
359
360 PRINT_FILED_DELAY_WITH_TS("THRASHING", t->version, t,
361 thrashing_count, thrashing_delay_total,
362 thrashing_delay_max, thrashing_delay_min, thrashing_delay_max_ts);
363
364 if (t->version >= 11) {
365 PRINT_FILED_DELAY_WITH_TS("COMPACT", t->version, t,
366 compact_count, compact_delay_total,
367 compact_delay_max, compact_delay_min, compact_delay_max_ts);
368 }
369
370 if (t->version >= 13) {
371 PRINT_FILED_DELAY_WITH_TS("WPCOPY", t->version, t,
372 wpcopy_count, wpcopy_delay_total,
373 wpcopy_delay_max, wpcopy_delay_min, wpcopy_delay_max_ts);
374 }
375
376 if (t->version >= 14) {
377 PRINT_FILED_DELAY_WITH_TS("IRQ", t->version, t,
378 irq_count, irq_delay_total,
379 irq_delay_max, irq_delay_min, irq_delay_max_ts);
380 }
381 } else {
382 /* Use original macro for older versions */
383 PRINT_FILED_DELAY("IO", t->version, t,
384 blkio_count, blkio_delay_total,
385 blkio_delay_max, blkio_delay_min);
386
387 PRINT_FILED_DELAY("SWAP", t->version, t,
388 swapin_count, swapin_delay_total,
389 swapin_delay_max, swapin_delay_min);
390
391 PRINT_FILED_DELAY("RECLAIM", t->version, t,
392 freepages_count, freepages_delay_total,
393 freepages_delay_max, freepages_delay_min);
394
395 PRINT_FILED_DELAY("THRASHING", t->version, t,
396 thrashing_count, thrashing_delay_total,
397 thrashing_delay_max, thrashing_delay_min);
398
399 if (t->version >= 11) {
400 PRINT_FILED_DELAY("COMPACT", t->version, t,
401 compact_count, compact_delay_total,
402 compact_delay_max, compact_delay_min);
403 }
404
405 if (t->version >= 13) {
406 PRINT_FILED_DELAY("WPCOPY", t->version, t,
407 wpcopy_count, wpcopy_delay_total,
408 wpcopy_delay_max, wpcopy_delay_min);
409 }
410
411 if (t->version >= 14) {
412 PRINT_FILED_DELAY("IRQ", t->version, t,
413 irq_count, irq_delay_total,
414 irq_delay_max, irq_delay_min);
415 }
416 }
417 }
418
task_context_switch_counts(struct taskstats * t)419 static void task_context_switch_counts(struct taskstats *t)
420 {
421 printf("\n\nTask %15s%15s\n"
422 " %15llu%15llu\n",
423 "voluntary", "nonvoluntary",
424 (unsigned long long)t->nvcsw, (unsigned long long)t->nivcsw);
425 }
426
print_cgroupstats(struct cgroupstats * c)427 static void print_cgroupstats(struct cgroupstats *c)
428 {
429 printf("sleeping %llu, blocked %llu, running %llu, stopped %llu, "
430 "uninterruptible %llu\n", (unsigned long long)c->nr_sleeping,
431 (unsigned long long)c->nr_io_wait,
432 (unsigned long long)c->nr_running,
433 (unsigned long long)c->nr_stopped,
434 (unsigned long long)c->nr_uninterruptible);
435 }
436
437
print_ioacct(struct taskstats * t)438 static void print_ioacct(struct taskstats *t)
439 {
440 printf("%s: read=%llu, write=%llu, cancelled_write=%llu\n",
441 t->ac_comm,
442 (unsigned long long)t->read_bytes,
443 (unsigned long long)t->write_bytes,
444 (unsigned long long)t->cancelled_write_bytes);
445 }
446
main(int argc,char * argv[])447 int main(int argc, char *argv[])
448 {
449 int c, rc, rep_len, aggr_len, len2;
450 int cmd_type = TASKSTATS_CMD_ATTR_UNSPEC;
451 __u16 id;
452 __u32 mypid;
453
454 struct nlattr *na;
455 int nl_sd = -1;
456 int len = 0;
457 pid_t tid = 0;
458 pid_t rtid = 0;
459
460 int fd = 0;
461 int write_file = 0;
462 int maskset = 0;
463 char *logfile = NULL;
464 int loop = 0;
465 int containerset = 0;
466 char *containerpath = NULL;
467 int cfd = 0;
468 int forking = 0;
469 sigset_t sigset;
470
471 struct msgtemplate msg;
472
473 while (!forking) {
474 c = getopt(argc, argv, "qdiw:r:m:t:p:vlC:c:");
475 if (c < 0)
476 break;
477
478 switch (c) {
479 case 'd':
480 printf("print delayacct stats ON\n");
481 print_delays = 1;
482 break;
483 case 'i':
484 printf("printing IO accounting\n");
485 print_io_accounting = 1;
486 break;
487 case 'q':
488 printf("printing task/process context switch rates\n");
489 print_task_context_switch_counts = 1;
490 break;
491 case 'C':
492 containerset = 1;
493 containerpath = optarg;
494 break;
495 case 'w':
496 logfile = strdup(optarg);
497 printf("write to file %s\n", logfile);
498 write_file = 1;
499 break;
500 case 'r':
501 rcvbufsz = atoi(optarg);
502 printf("receive buf size %d\n", rcvbufsz);
503 if (rcvbufsz < 0)
504 err(1, "Invalid rcv buf size\n");
505 break;
506 case 'm':
507 strncpy(cpumask, optarg, sizeof(cpumask));
508 cpumask[sizeof(cpumask) - 1] = '\0';
509 maskset = 1;
510 printf("cpumask %s maskset %d\n", cpumask, maskset);
511 break;
512 case 't':
513 tid = atoi(optarg);
514 if (!tid)
515 err(1, "Invalid tgid\n");
516 cmd_type = TASKSTATS_CMD_ATTR_TGID;
517 break;
518 case 'p':
519 tid = atoi(optarg);
520 if (!tid)
521 err(1, "Invalid pid\n");
522 cmd_type = TASKSTATS_CMD_ATTR_PID;
523 break;
524 case 'c':
525
526 /* Block SIGCHLD for sigwait() later */
527 if (sigemptyset(&sigset) == -1)
528 err(1, "Failed to empty sigset");
529 if (sigaddset(&sigset, SIGCHLD))
530 err(1, "Failed to set sigchld in sigset");
531 sigprocmask(SIG_BLOCK, &sigset, NULL);
532
533 /* fork/exec a child */
534 tid = fork();
535 if (tid < 0)
536 err(1, "Fork failed\n");
537 if (tid == 0)
538 if (execvp(argv[optind - 1],
539 &argv[optind - 1]) < 0)
540 exit(-1);
541
542 /* Set the command type and avoid further processing */
543 cmd_type = TASKSTATS_CMD_ATTR_PID;
544 forking = 1;
545 break;
546 case 'v':
547 printf("debug on\n");
548 dbg = 1;
549 break;
550 case 'l':
551 printf("listen forever\n");
552 loop = 1;
553 break;
554 default:
555 usage();
556 exit(-1);
557 }
558 }
559
560 if (write_file) {
561 fd = open(logfile, O_WRONLY | O_CREAT | O_TRUNC,
562 S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
563 if (fd == -1) {
564 perror("Cannot open output file\n");
565 exit(1);
566 }
567 }
568
569 nl_sd = create_nl_socket(NETLINK_GENERIC);
570 if (nl_sd < 0)
571 err(1, "error creating Netlink socket\n");
572
573
574 mypid = getpid();
575 id = get_family_id(nl_sd);
576 if (!id) {
577 fprintf(stderr, "Error getting family id, errno %d\n", errno);
578 goto err;
579 }
580 PRINTF("family id %d\n", id);
581
582 if (maskset) {
583 rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
584 TASKSTATS_CMD_ATTR_REGISTER_CPUMASK,
585 &cpumask, strlen(cpumask) + 1);
586 PRINTF("Sent register cpumask, retval %d\n", rc);
587 if (rc < 0) {
588 fprintf(stderr, "error sending register cpumask\n");
589 goto err;
590 }
591 }
592
593 if (tid && containerset) {
594 fprintf(stderr, "Select either -t or -C, not both\n");
595 goto err;
596 }
597
598 /*
599 * If we forked a child, wait for it to exit. Cannot use waitpid()
600 * as all the delicious data would be reaped as part of the wait
601 */
602 if (tid && forking) {
603 int sig_received;
604 sigwait(&sigset, &sig_received);
605 }
606
607 if (tid) {
608 rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
609 cmd_type, &tid, sizeof(__u32));
610 PRINTF("Sent pid/tgid, retval %d\n", rc);
611 if (rc < 0) {
612 fprintf(stderr, "error sending tid/tgid cmd\n");
613 goto done;
614 }
615 }
616
617 if (containerset) {
618 cfd = open(containerpath, O_RDONLY);
619 if (cfd < 0) {
620 perror("error opening container file");
621 goto err;
622 }
623 rc = send_cmd(nl_sd, id, mypid, CGROUPSTATS_CMD_GET,
624 CGROUPSTATS_CMD_ATTR_FD, &cfd, sizeof(__u32));
625 if (rc < 0) {
626 perror("error sending cgroupstats command");
627 goto err;
628 }
629 }
630 if (!maskset && !tid && !containerset) {
631 usage();
632 goto err;
633 }
634
635 do {
636 rep_len = recv(nl_sd, &msg, sizeof(msg), 0);
637 PRINTF("received %d bytes\n", rep_len);
638
639 if (rep_len < 0) {
640 fprintf(stderr, "nonfatal reply error: errno %d\n",
641 errno);
642 continue;
643 }
644 if (msg.n.nlmsg_type == NLMSG_ERROR ||
645 !NLMSG_OK((&msg.n), rep_len)) {
646 struct nlmsgerr *err = NLMSG_DATA(&msg);
647 fprintf(stderr, "fatal reply error, errno %d\n",
648 err->error);
649 goto done;
650 }
651
652 PRINTF("nlmsghdr size=%zu, nlmsg_len=%d, rep_len=%d\n",
653 sizeof(struct nlmsghdr), msg.n.nlmsg_len, rep_len);
654
655
656 rep_len = GENLMSG_PAYLOAD(&msg.n);
657
658 na = (struct nlattr *) GENLMSG_DATA(&msg);
659 len = 0;
660 while (len < rep_len) {
661 len += NLA_ALIGN(na->nla_len);
662 switch (na->nla_type) {
663 case TASKSTATS_TYPE_AGGR_TGID:
664 /* Fall through */
665 case TASKSTATS_TYPE_AGGR_PID:
666 aggr_len = NLA_PAYLOAD(na->nla_len);
667 len2 = 0;
668 /* For nested attributes, na follows */
669 na = (struct nlattr *) NLA_DATA(na);
670 while (len2 < aggr_len) {
671 switch (na->nla_type) {
672 case TASKSTATS_TYPE_PID:
673 rtid = *(int *) NLA_DATA(na);
674 if (print_delays)
675 printf("PID\t%d\n", rtid);
676 break;
677 case TASKSTATS_TYPE_TGID:
678 rtid = *(int *) NLA_DATA(na);
679 if (print_delays)
680 printf("TGID\t%d\n", rtid);
681 break;
682 case TASKSTATS_TYPE_STATS:
683 if (print_delays)
684 print_delayacct((struct taskstats *) NLA_DATA(na));
685 if (print_io_accounting)
686 print_ioacct((struct taskstats *) NLA_DATA(na));
687 if (print_task_context_switch_counts)
688 task_context_switch_counts((struct taskstats *) NLA_DATA(na));
689 if (fd) {
690 if (write(fd, NLA_DATA(na), na->nla_len) < 0) {
691 err(1,"write error\n");
692 }
693 }
694 if (!loop)
695 goto done;
696 break;
697 case TASKSTATS_TYPE_NULL:
698 break;
699 default:
700 fprintf(stderr, "Unknown nested"
701 " nla_type %d\n",
702 na->nla_type);
703 break;
704 }
705 len2 += NLA_ALIGN(na->nla_len);
706 na = (struct nlattr *)((char *)na +
707 NLA_ALIGN(na->nla_len));
708 }
709 break;
710
711 case CGROUPSTATS_TYPE_CGROUP_STATS:
712 print_cgroupstats(NLA_DATA(na));
713 break;
714 default:
715 fprintf(stderr, "Unknown nla_type %d\n",
716 na->nla_type);
717 case TASKSTATS_TYPE_NULL:
718 break;
719 }
720 na = (struct nlattr *) (GENLMSG_DATA(&msg) + len);
721 }
722 } while (loop);
723 done:
724 if (maskset) {
725 rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
726 TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK,
727 &cpumask, strlen(cpumask) + 1);
728 printf("Sent deregister mask, retval %d\n", rc);
729 if (rc < 0)
730 err(rc, "error sending deregister cpumask\n");
731 }
732 err:
733 close(nl_sd);
734 if (fd)
735 close(fd);
736 if (cfd)
737 close(cfd);
738 return 0;
739 }
740