Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
49int rcvbufsz;
50char name[100];
51int dbg;
52int print_delays;
53int print_io_accounting;
54int 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 2048
64/* Maximum number of cpus expected to be specified in a cpumask */
65#define MAX_CPUS 32
66
67struct msgtemplate {
68 struct nlmsghdr n;
69 struct genlmsghdr g;
70 char buf[MAX_MSG_SIZE];
71};
72
73char cpumask[100+6*MAX_CPUS];
74
75static 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 */
89static 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;
113error:
114 close(fd);
115 return -1;
116}
117
118static int recv_taskstats_msg(int sd, struct msgtemplate *msg)
119{
120 struct sockaddr_nl nladdr;
121 struct iovec iov = {
122 .iov_base = msg,
123 .iov_len = sizeof(*msg),
124 };
125 struct msghdr hdr = {
126 .msg_name = &nladdr,
127 .msg_namelen = sizeof(nladdr),
128 .msg_iov = &iov,
129 .msg_iovlen = 1,
130 };
131 int ret;
132
133 ret = recvmsg(sd, &hdr, 0);
134 if (ret < 0)
135 return -1;
136 if (hdr.msg_flags & MSG_TRUNC) {
137 errno = EMSGSIZE;
138 return -1;
139 }
140
141 return ret;
142}
143
144
145static int send_cmd(int sd, __u16 nlmsg_type, __u32 nlmsg_pid,
146 __u8 genl_cmd, __u16 nla_type,
147 void *nla_data, int nla_len)
148{
149 struct nlattr *na;
150 struct sockaddr_nl nladdr;
151 int r, buflen;
152 char *buf;
153
154 struct msgtemplate msg;
155
156 msg.n.nlmsg_len = NLMSG_LENGTH(GENL_HDRLEN);
157 msg.n.nlmsg_type = nlmsg_type;
158 msg.n.nlmsg_flags = NLM_F_REQUEST;
159 msg.n.nlmsg_seq = 0;
160 msg.n.nlmsg_pid = nlmsg_pid;
161 msg.g.cmd = genl_cmd;
162 msg.g.version = 0x1;
163 na = (struct nlattr *) GENLMSG_DATA(&msg);
164 na->nla_type = nla_type;
165 na->nla_len = nla_len + NLA_HDRLEN;
166 memcpy(NLA_DATA(na), nla_data, nla_len);
167 msg.n.nlmsg_len += NLMSG_ALIGN(na->nla_len);
168
169 buf = (char *) &msg;
170 buflen = msg.n.nlmsg_len ;
171 memset(&nladdr, 0, sizeof(nladdr));
172 nladdr.nl_family = AF_NETLINK;
173 while ((r = sendto(sd, buf, buflen, 0, (struct sockaddr *) &nladdr,
174 sizeof(nladdr))) < buflen) {
175 if (r > 0) {
176 buf += r;
177 buflen -= r;
178 } else if (errno != EAGAIN)
179 return -1;
180 }
181 return 0;
182}
183
184
185/*
186 * Probe the controller in genetlink to find the family id
187 * for the TASKSTATS family
188 */
189static int get_family_id(int sd)
190{
191 struct {
192 struct nlmsghdr n;
193 struct genlmsghdr g;
194 char buf[256];
195 } ans;
196
197 int id = 0, rc;
198 struct nlattr *na;
199 int rep_len;
200
201 strcpy(name, TASKSTATS_GENL_NAME);
202 rc = send_cmd(sd, GENL_ID_CTRL, getpid(), CTRL_CMD_GETFAMILY,
203 CTRL_ATTR_FAMILY_NAME, (void *)name,
204 strlen(TASKSTATS_GENL_NAME)+1);
205 if (rc < 0)
206 return 0; /* sendto() failure? */
207
208 rep_len = recv(sd, &ans, sizeof(ans), 0);
209 if (ans.n.nlmsg_type == NLMSG_ERROR ||
210 (rep_len < 0) || !NLMSG_OK((&ans.n), rep_len))
211 return 0;
212
213 na = (struct nlattr *) GENLMSG_DATA(&ans);
214 na = (struct nlattr *) ((char *) na + NLA_ALIGN(na->nla_len));
215 if (na->nla_type == CTRL_ATTR_FAMILY_ID) {
216 id = *(__u16 *) NLA_DATA(na);
217 }
218 return id;
219}
220
221#define average_ms(t, c) (t / 1000000ULL / (c ? c : 1))
222#define delay_ms(t) (t / 1000000ULL)
223
224/*
225 * Format __kernel_timespec to human readable string (YYYY-MM-DD HH:MM:SS)
226 * Returns formatted string or "N/A" if timestamp is zero
227 */
228static const char *format_timespec(struct __kernel_timespec *ts)
229{
230 static char buffer[32];
231 struct tm tm_info;
232 __kernel_time_t time_sec;
233
234 /* Check if timestamp is zero (not set) */
235 if (ts->tv_sec == 0 && ts->tv_nsec == 0)
236 return "N/A";
237
238 time_sec = ts->tv_sec;
239
240 /* Use thread-safe localtime_r */
241 if (localtime_r(&time_sec, &tm_info) == NULL)
242 return "N/A";
243
244 snprintf(buffer, sizeof(buffer), "%04d-%02d-%02dT%02d:%02d:%02d",
245 tm_info.tm_year + 1900,
246 tm_info.tm_mon + 1,
247 tm_info.tm_mday,
248 tm_info.tm_hour,
249 tm_info.tm_min,
250 tm_info.tm_sec);
251
252 return buffer;
253}
254
255/*
256 * Version compatibility note:
257 * Field availability depends on taskstats version (t->version),
258 * corresponding to TASKSTATS_VERSION in kernel headers
259 * see include/uapi/linux/taskstats.h
260 *
261 * Version feature mapping:
262 * version >= 11 - supports COMPACT statistics
263 * version >= 13 - supports WPCOPY statistics
264 * version >= 14 - supports IRQ statistics
265 * version >= 16 - supports *_max and *_min delay statistics
266 * version >= 17 - supports delay max timestamp statistics
267 *
268 * Always verify version before accessing version-dependent fields
269 * to maintain backward compatibility.
270 */
271#define PRINT_CPU_DELAY(version, t) \
272 do { \
273 if (version >= 17) { \
274 printf("%-10s%15s%15s%15s%15s%15s%15s%15s%25s\n", \
275 "CPU", "count", "real total", "virtual total", \
276 "delay total", "delay average", "delay max", \
277 "delay min", "delay max timestamp"); \
278 printf(" %15llu%15llu%15llu%15llu%15.3fms%13.6fms%13.6fms%23s\n", \
279 (unsigned long long)(t)->cpu_count, \
280 (unsigned long long)(t)->cpu_run_real_total, \
281 (unsigned long long)(t)->cpu_run_virtual_total, \
282 (unsigned long long)(t)->cpu_delay_total, \
283 average_ms((double)(t)->cpu_delay_total, (t)->cpu_count), \
284 delay_ms((double)(t)->cpu_delay_max), \
285 delay_ms((double)(t)->cpu_delay_min), \
286 format_timespec(&(t)->cpu_delay_max_ts)); \
287 } else if (version >= 16) { \
288 printf("%-10s%15s%15s%15s%15s%15s%15s%15s\n", \
289 "CPU", "count", "real total", "virtual total", \
290 "delay total", "delay average", "delay max", "delay min"); \
291 printf(" %15llu%15llu%15llu%15llu%15.3fms%13.6fms%13.6fms\n", \
292 (unsigned long long)(t)->cpu_count, \
293 (unsigned long long)(t)->cpu_run_real_total, \
294 (unsigned long long)(t)->cpu_run_virtual_total, \
295 (unsigned long long)(t)->cpu_delay_total, \
296 average_ms((double)(t)->cpu_delay_total, (t)->cpu_count), \
297 delay_ms((double)(t)->cpu_delay_max), \
298 delay_ms((double)(t)->cpu_delay_min)); \
299 } else { \
300 printf("%-10s%15s%15s%15s%15s%15s\n", \
301 "CPU", "count", "real total", "virtual total", \
302 "delay total", "delay average"); \
303 printf(" %15llu%15llu%15llu%15llu%15.3fms\n", \
304 (unsigned long long)(t)->cpu_count, \
305 (unsigned long long)(t)->cpu_run_real_total, \
306 (unsigned long long)(t)->cpu_run_virtual_total, \
307 (unsigned long long)(t)->cpu_delay_total, \
308 average_ms((double)(t)->cpu_delay_total, (t)->cpu_count)); \
309 } \
310 } while (0)
311#define PRINT_FILED_DELAY(name, version, t, count, total, max, min) \
312 do { \
313 if (version >= 16) { \
314 printf("%-10s%15s%15s%15s%15s%15s\n", \
315 name, "count", "delay total", "delay average", \
316 "delay max", "delay min"); \
317 printf(" %15llu%15llu%15.3fms%13.6fms%13.6fms\n", \
318 (unsigned long long)(t)->count, \
319 (unsigned long long)(t)->total, \
320 average_ms((double)(t)->total, (t)->count), \
321 delay_ms((double)(t)->max), \
322 delay_ms((double)(t)->min)); \
323 } else { \
324 printf("%-10s%15s%15s%15s\n", \
325 name, "count", "delay total", "delay average"); \
326 printf(" %15llu%15llu%15.3fms\n", \
327 (unsigned long long)(t)->count, \
328 (unsigned long long)(t)->total, \
329 average_ms((double)(t)->total, (t)->count)); \
330 } \
331 } while (0)
332
333#define PRINT_FILED_DELAY_WITH_TS(name, version, t, count, total, max, min, max_ts) \
334 do { \
335 if (version >= 17) { \
336 printf("%-10s%15s%15s%15s%15s%15s%25s\n", \
337 name, "count", "delay total", "delay average", \
338 "delay max", "delay min", "delay max timestamp"); \
339 printf(" %15llu%15llu%15.3fms%13.6fms%13.6fms%23s\n", \
340 (unsigned long long)(t)->count, \
341 (unsigned long long)(t)->total, \
342 average_ms((double)(t)->total, (t)->count), \
343 delay_ms((double)(t)->max), \
344 delay_ms((double)(t)->min), \
345 format_timespec(&(t)->max_ts)); \
346 } else if (version >= 16) { \
347 printf("%-10s%15s%15s%15s%15s%15s\n", \
348 name, "count", "delay total", "delay average", \
349 "delay max", "delay min"); \
350 printf(" %15llu%15llu%15.3fms%13.6fms%13.6fms\n", \
351 (unsigned long long)(t)->count, \
352 (unsigned long long)(t)->total, \
353 average_ms((double)(t)->total, (t)->count), \
354 delay_ms((double)(t)->max), \
355 delay_ms((double)(t)->min)); \
356 } else { \
357 printf("%-10s%15s%15s%15s\n", \
358 name, "count", "delay total", "delay average"); \
359 printf(" %15llu%15llu%15.3fms\n", \
360 (unsigned long long)(t)->count, \
361 (unsigned long long)(t)->total, \
362 average_ms((double)(t)->total, (t)->count)); \
363 } \
364 } while (0)
365
366static void print_delayacct(struct taskstats *t)
367{
368 printf("\n\n");
369
370 PRINT_CPU_DELAY(t->version, t);
371
372 /* Use new macro with timestamp support for version >= 17 */
373 if (t->version >= 17) {
374 PRINT_FILED_DELAY_WITH_TS("IO", t->version, t,
375 blkio_count, blkio_delay_total,
376 blkio_delay_max, blkio_delay_min, blkio_delay_max_ts);
377
378 PRINT_FILED_DELAY_WITH_TS("SWAP", t->version, t,
379 swapin_count, swapin_delay_total,
380 swapin_delay_max, swapin_delay_min, swapin_delay_max_ts);
381
382 PRINT_FILED_DELAY_WITH_TS("RECLAIM", t->version, t,
383 freepages_count, freepages_delay_total,
384 freepages_delay_max, freepages_delay_min, freepages_delay_max_ts);
385
386 PRINT_FILED_DELAY_WITH_TS("THRASHING", t->version, t,
387 thrashing_count, thrashing_delay_total,
388 thrashing_delay_max, thrashing_delay_min, thrashing_delay_max_ts);
389
390 if (t->version >= 11) {
391 PRINT_FILED_DELAY_WITH_TS("COMPACT", t->version, t,
392 compact_count, compact_delay_total,
393 compact_delay_max, compact_delay_min, compact_delay_max_ts);
394 }
395
396 if (t->version >= 13) {
397 PRINT_FILED_DELAY_WITH_TS("WPCOPY", t->version, t,
398 wpcopy_count, wpcopy_delay_total,
399 wpcopy_delay_max, wpcopy_delay_min, wpcopy_delay_max_ts);
400 }
401
402 if (t->version >= 14) {
403 PRINT_FILED_DELAY_WITH_TS("IRQ", t->version, t,
404 irq_count, irq_delay_total,
405 irq_delay_max, irq_delay_min, irq_delay_max_ts);
406 }
407 } else {
408 /* Use original macro for older versions */
409 PRINT_FILED_DELAY("IO", t->version, t,
410 blkio_count, blkio_delay_total,
411 blkio_delay_max, blkio_delay_min);
412
413 PRINT_FILED_DELAY("SWAP", t->version, t,
414 swapin_count, swapin_delay_total,
415 swapin_delay_max, swapin_delay_min);
416
417 PRINT_FILED_DELAY("RECLAIM", t->version, t,
418 freepages_count, freepages_delay_total,
419 freepages_delay_max, freepages_delay_min);
420
421 PRINT_FILED_DELAY("THRASHING", t->version, t,
422 thrashing_count, thrashing_delay_total,
423 thrashing_delay_max, thrashing_delay_min);
424
425 if (t->version >= 11) {
426 PRINT_FILED_DELAY("COMPACT", t->version, t,
427 compact_count, compact_delay_total,
428 compact_delay_max, compact_delay_min);
429 }
430
431 if (t->version >= 13) {
432 PRINT_FILED_DELAY("WPCOPY", t->version, t,
433 wpcopy_count, wpcopy_delay_total,
434 wpcopy_delay_max, wpcopy_delay_min);
435 }
436
437 if (t->version >= 14) {
438 PRINT_FILED_DELAY("IRQ", t->version, t,
439 irq_count, irq_delay_total,
440 irq_delay_max, irq_delay_min);
441 }
442 }
443}
444
445static void task_context_switch_counts(struct taskstats *t)
446{
447 printf("\n\nTask %15s%15s\n"
448 " %15llu%15llu\n",
449 "voluntary", "nonvoluntary",
450 (unsigned long long)t->nvcsw, (unsigned long long)t->nivcsw);
451}
452
453static void print_cgroupstats(struct cgroupstats *c)
454{
455 printf("sleeping %llu, blocked %llu, running %llu, stopped %llu, "
456 "uninterruptible %llu\n", (unsigned long long)c->nr_sleeping,
457 (unsigned long long)c->nr_io_wait,
458 (unsigned long long)c->nr_running,
459 (unsigned long long)c->nr_stopped,
460 (unsigned long long)c->nr_uninterruptible);
461}
462
463
464static void print_ioacct(struct taskstats *t)
465{
466 printf("%s: read=%llu, write=%llu, cancelled_write=%llu\n",
467 t->ac_comm,
468 (unsigned long long)t->read_bytes,
469 (unsigned long long)t->write_bytes,
470 (unsigned long long)t->cancelled_write_bytes);
471}
472
473int main(int argc, char *argv[])
474{
475 int c, rc, rep_len, aggr_len, len2;
476 int cmd_type = TASKSTATS_CMD_ATTR_UNSPEC;
477 __u16 id;
478 __u32 mypid;
479
480 struct nlattr *na;
481 int nl_sd = -1;
482 int len = 0;
483 pid_t tid = 0;
484 pid_t rtid = 0;
485
486 int fd = 0;
487 int write_file = 0;
488 int maskset = 0;
489 char *logfile = NULL;
490 int loop = 0;
491 int containerset = 0;
492 char *containerpath = NULL;
493 int cfd = 0;
494 int forking = 0;
495 sigset_t sigset;
496
497 struct msgtemplate msg;
498
499 while (!forking) {
500 c = getopt(argc, argv, "qdiw:r:m:t:p:vlC:c:");
501 if (c < 0)
502 break;
503
504 switch (c) {
505 case 'd':
506 printf("print delayacct stats ON\n");
507 print_delays = 1;
508 break;
509 case 'i':
510 printf("printing IO accounting\n");
511 print_io_accounting = 1;
512 break;
513 case 'q':
514 printf("printing task/process context switch rates\n");
515 print_task_context_switch_counts = 1;
516 break;
517 case 'C':
518 containerset = 1;
519 containerpath = optarg;
520 break;
521 case 'w':
522 logfile = strdup(optarg);
523 printf("write to file %s\n", logfile);
524 write_file = 1;
525 break;
526 case 'r':
527 rcvbufsz = atoi(optarg);
528 printf("receive buf size %d\n", rcvbufsz);
529 if (rcvbufsz < 0)
530 err(1, "Invalid rcv buf size\n");
531 break;
532 case 'm':
533 strncpy(cpumask, optarg, sizeof(cpumask));
534 cpumask[sizeof(cpumask) - 1] = '\0';
535 maskset = 1;
536 printf("cpumask %s maskset %d\n", cpumask, maskset);
537 break;
538 case 't':
539 tid = atoi(optarg);
540 if (!tid)
541 err(1, "Invalid tgid\n");
542 cmd_type = TASKSTATS_CMD_ATTR_TGID;
543 break;
544 case 'p':
545 tid = atoi(optarg);
546 if (!tid)
547 err(1, "Invalid pid\n");
548 cmd_type = TASKSTATS_CMD_ATTR_PID;
549 break;
550 case 'c':
551
552 /* Block SIGCHLD for sigwait() later */
553 if (sigemptyset(&sigset) == -1)
554 err(1, "Failed to empty sigset");
555 if (sigaddset(&sigset, SIGCHLD))
556 err(1, "Failed to set sigchld in sigset");
557 sigprocmask(SIG_BLOCK, &sigset, NULL);
558
559 /* fork/exec a child */
560 tid = fork();
561 if (tid < 0)
562 err(1, "Fork failed\n");
563 if (tid == 0)
564 if (execvp(argv[optind - 1],
565 &argv[optind - 1]) < 0)
566 exit(-1);
567
568 /* Set the command type and avoid further processing */
569 cmd_type = TASKSTATS_CMD_ATTR_PID;
570 forking = 1;
571 break;
572 case 'v':
573 printf("debug on\n");
574 dbg = 1;
575 break;
576 case 'l':
577 printf("listen forever\n");
578 loop = 1;
579 break;
580 default:
581 usage();
582 exit(-1);
583 }
584 }
585
586 if (write_file) {
587 fd = open(logfile, O_WRONLY | O_CREAT | O_TRUNC,
588 S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
589 if (fd == -1) {
590 perror("Cannot open output file\n");
591 exit(1);
592 }
593 }
594
595 nl_sd = create_nl_socket(NETLINK_GENERIC);
596 if (nl_sd < 0)
597 err(1, "error creating Netlink socket\n");
598
599
600 mypid = getpid();
601 id = get_family_id(nl_sd);
602 if (!id) {
603 fprintf(stderr, "Error getting family id, errno %d\n", errno);
604 goto err;
605 }
606 PRINTF("family id %d\n", id);
607
608 if (maskset) {
609 rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
610 TASKSTATS_CMD_ATTR_REGISTER_CPUMASK,
611 &cpumask, strlen(cpumask) + 1);
612 PRINTF("Sent register cpumask, retval %d\n", rc);
613 if (rc < 0) {
614 fprintf(stderr, "error sending register cpumask\n");
615 goto err;
616 }
617 }
618
619 if (tid && containerset) {
620 fprintf(stderr, "Select either -t or -C, not both\n");
621 goto err;
622 }
623
624 /*
625 * If we forked a child, wait for it to exit. Cannot use waitpid()
626 * as all the delicious data would be reaped as part of the wait
627 */
628 if (tid && forking) {
629 int sig_received;
630 sigwait(&sigset, &sig_received);
631 }
632
633 if (tid) {
634 rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
635 cmd_type, &tid, sizeof(__u32));
636 PRINTF("Sent pid/tgid, retval %d\n", rc);
637 if (rc < 0) {
638 fprintf(stderr, "error sending tid/tgid cmd\n");
639 goto done;
640 }
641 }
642
643 if (containerset) {
644 cfd = open(containerpath, O_RDONLY);
645 if (cfd < 0) {
646 perror("error opening container file");
647 goto err;
648 }
649 rc = send_cmd(nl_sd, id, mypid, CGROUPSTATS_CMD_GET,
650 CGROUPSTATS_CMD_ATTR_FD, &cfd, sizeof(__u32));
651 if (rc < 0) {
652 perror("error sending cgroupstats command");
653 goto err;
654 }
655 }
656 if (!maskset && !tid && !containerset) {
657 usage();
658 goto err;
659 }
660
661 do {
662 rep_len = recv_taskstats_msg(nl_sd, &msg);
663 PRINTF("received %d bytes\n", rep_len);
664
665 if (rep_len < 0) {
666 if (errno == EMSGSIZE)
667 fprintf(stderr,
668 "dropped truncated taskstats netlink message, please increase MAX_MSG_SIZE\n");
669 else
670 fprintf(stderr, "nonfatal reply error: errno %d\n",
671 errno);
672 continue;
673 }
674 if (msg.n.nlmsg_type == NLMSG_ERROR ||
675 !NLMSG_OK((&msg.n), rep_len)) {
676 struct nlmsgerr *err = NLMSG_DATA(&msg);
677 fprintf(stderr, "fatal reply error, errno %d\n",
678 err->error);
679 goto done;
680 }
681
682 PRINTF("nlmsghdr size=%zu, nlmsg_len=%d, rep_len=%d\n",
683 sizeof(struct nlmsghdr), msg.n.nlmsg_len, rep_len);
684
685
686 rep_len = GENLMSG_PAYLOAD(&msg.n);
687
688 na = (struct nlattr *) GENLMSG_DATA(&msg);
689 len = 0;
690 while (len < rep_len) {
691 len += NLA_ALIGN(na->nla_len);
692 switch (na->nla_type) {
693 case TASKSTATS_TYPE_AGGR_TGID:
694 /* Fall through */
695 case TASKSTATS_TYPE_AGGR_PID:
696 aggr_len = NLA_PAYLOAD(na->nla_len);
697 len2 = 0;
698 /* For nested attributes, na follows */
699 na = (struct nlattr *) NLA_DATA(na);
700 while (len2 < aggr_len) {
701 switch (na->nla_type) {
702 case TASKSTATS_TYPE_PID:
703 rtid = *(int *) NLA_DATA(na);
704 if (print_delays)
705 printf("PID\t%d\n", rtid);
706 break;
707 case TASKSTATS_TYPE_TGID:
708 rtid = *(int *) NLA_DATA(na);
709 if (print_delays)
710 printf("TGID\t%d\n", rtid);
711 break;
712 case TASKSTATS_TYPE_STATS:
713 PRINTF("version %u\n",
714 ((struct taskstats *)
715 NLA_DATA(na))->version);
716 if (print_delays)
717 print_delayacct((struct taskstats *) NLA_DATA(na));
718 if (print_io_accounting)
719 print_ioacct((struct taskstats *) NLA_DATA(na));
720 if (print_task_context_switch_counts)
721 task_context_switch_counts((struct taskstats *) NLA_DATA(na));
722 if (fd) {
723 if (write(fd, NLA_DATA(na), na->nla_len) < 0) {
724 err(1,"write error\n");
725 }
726 }
727 if (!loop)
728 goto done;
729 break;
730 case TASKSTATS_TYPE_NULL:
731 break;
732 default:
733 fprintf(stderr, "Unknown nested"
734 " nla_type %d\n",
735 na->nla_type);
736 break;
737 }
738 len2 += NLA_ALIGN(na->nla_len);
739 na = (struct nlattr *)((char *)na +
740 NLA_ALIGN(na->nla_len));
741 }
742 break;
743
744 case CGROUPSTATS_TYPE_CGROUP_STATS:
745 print_cgroupstats(NLA_DATA(na));
746 break;
747 default:
748 fprintf(stderr, "Unknown nla_type %d\n",
749 na->nla_type);
750 case TASKSTATS_TYPE_NULL:
751 break;
752 }
753 na = (struct nlattr *) (GENLMSG_DATA(&msg) + len);
754 }
755 } while (loop);
756done:
757 if (maskset) {
758 rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
759 TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK,
760 &cpumask, strlen(cpumask) + 1);
761 printf("Sent deregister mask, retval %d\n", rc);
762 if (rc < 0)
763 err(rc, "error sending deregister cpumask\n");
764 }
765err:
766 close(nl_sd);
767 if (fd)
768 close(fd);
769 if (cfd)
770 close(cfd);
771 return 0;
772}