1 // SPDX-License-Identifier: GPL-2.0
4 * Utility to get per-pid and per-tgid delay accounting statistics
5 * Also illustrates usage of the taskstats interface
7 * Copyright (C) Shailabh Nagar, IBM Corp. 2005
8 * Copyright (C) Balbir Singh, IBM Corp. 2006
9 * Copyright (c) Jay Lan, SGI. 2006
12 * gcc -I/usr/src/linux/include getdelays.c -o getdelays
22 #include <sys/types.h>
24 #include <sys/socket.h>
28 #include <linux/genetlink.h>
29 #include <linux/taskstats.h>
30 #include <linux/cgroupstats.h>
33 * Generic macros for dealing with netlink sockets. Might be duplicated
34 * elsewhere. It is recommended that commercial grade applications use
35 * libnl or libnetlink and use the interfaces provided by the library
37 #define GENLMSG_DATA(glh) ((void *)(NLMSG_DATA(glh) + GENL_HDRLEN))
38 #define GENLMSG_PAYLOAD(glh) (NLMSG_PAYLOAD(glh, 0) - GENL_HDRLEN)
39 #define NLA_DATA(na) ((void *)((char*)(na) + NLA_HDRLEN))
40 #define NLA_PAYLOAD(len) (len - NLA_HDRLEN)
42 #define err(code, fmt, arg...) \
44 fprintf(stderr, fmt, ##arg); \
52 int print_io_accounting;
53 int print_task_context_switch_counts;
55 #define PRINTF(fmt, arg...) { \
61 /* Maximum size of response requested or message sent */
62 #define MAX_MSG_SIZE 1024
63 /* Maximum number of cpus expected to be specified in a cpumask */
69 char buf[MAX_MSG_SIZE];
72 char cpumask[100+6*MAX_CPUS];
74 static void usage(void)
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");
86 * Create a raw netlink socket and bind
88 static int create_nl_socket(int protocol)
91 struct sockaddr_nl local;
93 fd = socket(AF_NETLINK, SOCK_RAW, protocol);
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",
105 memset(&local, 0, sizeof(local));
106 local.nl_family = AF_NETLINK;
108 if (bind(fd, (struct sockaddr *) &local, sizeof(local)) < 0)
118 static 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)
123 struct sockaddr_nl nladdr;
127 struct msgtemplate msg;
129 msg.n.nlmsg_len = NLMSG_LENGTH(GENL_HDRLEN);
130 msg.n.nlmsg_type = nlmsg_type;
131 msg.n.nlmsg_flags = NLM_F_REQUEST;
133 msg.n.nlmsg_pid = nlmsg_pid;
134 msg.g.cmd = genl_cmd;
136 na = (struct nlattr *) GENLMSG_DATA(&msg);
137 na->nla_type = nla_type;
138 na->nla_len = nla_len + NLA_HDRLEN;
139 memcpy(NLA_DATA(na), nla_data, nla_len);
140 msg.n.nlmsg_len += NLMSG_ALIGN(na->nla_len);
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) {
151 } else if (errno != EAGAIN)
159 * Probe the controller in genetlink to find the family id
160 * for the TASKSTATS family
162 static int get_family_id(int sd)
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);
179 return 0; /* sendto() failure? */
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))
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);
194 #define average_ms(t, c) (t / 1000000ULL / (c ? c : 1))
196 static void print_delayacct(struct taskstats *t)
198 printf("\n\nCPU %15s%15s%15s%15s%15s\n"
199 " %15llu%15llu%15llu%15llu%15.3fms\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 "THRASHING%12s%15s%15s\n"
207 " %15llu%15llu%15llums\n"
208 "COMPACT %12s%15s%15s\n"
209 " %15llu%15llu%15llums\n"
210 "WPCOPY %12s%15s%15s\n"
211 " %15llu%15llu%15llums\n",
212 "count", "real total", "virtual total",
213 "delay total", "delay average",
214 (unsigned long long)t->cpu_count,
215 (unsigned long long)t->cpu_run_real_total,
216 (unsigned long long)t->cpu_run_virtual_total,
217 (unsigned long long)t->cpu_delay_total,
218 average_ms((double)t->cpu_delay_total, t->cpu_count),
219 "count", "delay total", "delay average",
220 (unsigned long long)t->blkio_count,
221 (unsigned long long)t->blkio_delay_total,
222 average_ms(t->blkio_delay_total, t->blkio_count),
223 "count", "delay total", "delay average",
224 (unsigned long long)t->swapin_count,
225 (unsigned long long)t->swapin_delay_total,
226 average_ms(t->swapin_delay_total, t->swapin_count),
227 "count", "delay total", "delay average",
228 (unsigned long long)t->freepages_count,
229 (unsigned long long)t->freepages_delay_total,
230 average_ms(t->freepages_delay_total, t->freepages_count),
231 "count", "delay total", "delay average",
232 (unsigned long long)t->thrashing_count,
233 (unsigned long long)t->thrashing_delay_total,
234 average_ms(t->thrashing_delay_total, t->thrashing_count),
235 "count", "delay total", "delay average",
236 (unsigned long long)t->compact_count,
237 (unsigned long long)t->compact_delay_total,
238 average_ms(t->compact_delay_total, t->compact_count),
239 "count", "delay total", "delay average",
240 (unsigned long long)t->wpcopy_count,
241 (unsigned long long)t->wpcopy_delay_total,
242 average_ms(t->wpcopy_delay_total, t->wpcopy_count));
245 static void task_context_switch_counts(struct taskstats *t)
247 printf("\n\nTask %15s%15s\n"
249 "voluntary", "nonvoluntary",
250 (unsigned long long)t->nvcsw, (unsigned long long)t->nivcsw);
253 static void print_cgroupstats(struct cgroupstats *c)
255 printf("sleeping %llu, blocked %llu, running %llu, stopped %llu, "
256 "uninterruptible %llu\n", (unsigned long long)c->nr_sleeping,
257 (unsigned long long)c->nr_io_wait,
258 (unsigned long long)c->nr_running,
259 (unsigned long long)c->nr_stopped,
260 (unsigned long long)c->nr_uninterruptible);
264 static void print_ioacct(struct taskstats *t)
266 printf("%s: read=%llu, write=%llu, cancelled_write=%llu\n",
268 (unsigned long long)t->read_bytes,
269 (unsigned long long)t->write_bytes,
270 (unsigned long long)t->cancelled_write_bytes);
273 int main(int argc, char *argv[])
275 int c, rc, rep_len, aggr_len, len2;
276 int cmd_type = TASKSTATS_CMD_ATTR_UNSPEC;
289 char *logfile = NULL;
291 int containerset = 0;
292 char *containerpath = NULL;
297 struct msgtemplate msg;
300 c = getopt(argc, argv, "qdiw:r:m:t:p:vlC:c:");
306 printf("print delayacct stats ON\n");
310 printf("printing IO accounting\n");
311 print_io_accounting = 1;
314 printf("printing task/process context switch rates\n");
315 print_task_context_switch_counts = 1;
319 containerpath = optarg;
322 logfile = strdup(optarg);
323 printf("write to file %s\n", logfile);
327 rcvbufsz = atoi(optarg);
328 printf("receive buf size %d\n", rcvbufsz);
330 err(1, "Invalid rcv buf size\n");
333 strncpy(cpumask, optarg, sizeof(cpumask));
334 cpumask[sizeof(cpumask) - 1] = '\0';
336 printf("cpumask %s maskset %d\n", cpumask, maskset);
341 err(1, "Invalid tgid\n");
342 cmd_type = TASKSTATS_CMD_ATTR_TGID;
347 err(1, "Invalid pid\n");
348 cmd_type = TASKSTATS_CMD_ATTR_PID;
352 /* Block SIGCHLD for sigwait() later */
353 if (sigemptyset(&sigset) == -1)
354 err(1, "Failed to empty sigset");
355 if (sigaddset(&sigset, SIGCHLD))
356 err(1, "Failed to set sigchld in sigset");
357 sigprocmask(SIG_BLOCK, &sigset, NULL);
359 /* fork/exec a child */
362 err(1, "Fork failed\n");
364 if (execvp(argv[optind - 1],
365 &argv[optind - 1]) < 0)
368 /* Set the command type and avoid further processing */
369 cmd_type = TASKSTATS_CMD_ATTR_PID;
373 printf("debug on\n");
377 printf("listen forever\n");
387 fd = open(logfile, O_WRONLY | O_CREAT | O_TRUNC,
388 S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
390 perror("Cannot open output file\n");
395 nl_sd = create_nl_socket(NETLINK_GENERIC);
397 err(1, "error creating Netlink socket\n");
401 id = get_family_id(nl_sd);
403 fprintf(stderr, "Error getting family id, errno %d\n", errno);
406 PRINTF("family id %d\n", id);
409 rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
410 TASKSTATS_CMD_ATTR_REGISTER_CPUMASK,
411 &cpumask, strlen(cpumask) + 1);
412 PRINTF("Sent register cpumask, retval %d\n", rc);
414 fprintf(stderr, "error sending register cpumask\n");
419 if (tid && containerset) {
420 fprintf(stderr, "Select either -t or -C, not both\n");
425 * If we forked a child, wait for it to exit. Cannot use waitpid()
426 * as all the delicious data would be reaped as part of the wait
428 if (tid && forking) {
430 sigwait(&sigset, &sig_received);
434 rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
435 cmd_type, &tid, sizeof(__u32));
436 PRINTF("Sent pid/tgid, retval %d\n", rc);
438 fprintf(stderr, "error sending tid/tgid cmd\n");
444 cfd = open(containerpath, O_RDONLY);
446 perror("error opening container file");
449 rc = send_cmd(nl_sd, id, mypid, CGROUPSTATS_CMD_GET,
450 CGROUPSTATS_CMD_ATTR_FD, &cfd, sizeof(__u32));
452 perror("error sending cgroupstats command");
456 if (!maskset && !tid && !containerset) {
462 rep_len = recv(nl_sd, &msg, sizeof(msg), 0);
463 PRINTF("received %d bytes\n", rep_len);
466 fprintf(stderr, "nonfatal reply error: errno %d\n",
470 if (msg.n.nlmsg_type == NLMSG_ERROR ||
471 !NLMSG_OK((&msg.n), rep_len)) {
472 struct nlmsgerr *err = NLMSG_DATA(&msg);
473 fprintf(stderr, "fatal reply error, errno %d\n",
478 PRINTF("nlmsghdr size=%zu, nlmsg_len=%d, rep_len=%d\n",
479 sizeof(struct nlmsghdr), msg.n.nlmsg_len, rep_len);
482 rep_len = GENLMSG_PAYLOAD(&msg.n);
484 na = (struct nlattr *) GENLMSG_DATA(&msg);
486 while (len < rep_len) {
487 len += NLA_ALIGN(na->nla_len);
488 switch (na->nla_type) {
489 case TASKSTATS_TYPE_AGGR_TGID:
491 case TASKSTATS_TYPE_AGGR_PID:
492 aggr_len = NLA_PAYLOAD(na->nla_len);
494 /* For nested attributes, na follows */
495 na = (struct nlattr *) NLA_DATA(na);
496 while (len2 < aggr_len) {
497 switch (na->nla_type) {
498 case TASKSTATS_TYPE_PID:
499 rtid = *(int *) NLA_DATA(na);
501 printf("PID\t%d\n", rtid);
503 case TASKSTATS_TYPE_TGID:
504 rtid = *(int *) NLA_DATA(na);
506 printf("TGID\t%d\n", rtid);
508 case TASKSTATS_TYPE_STATS:
510 print_delayacct((struct taskstats *) NLA_DATA(na));
511 if (print_io_accounting)
512 print_ioacct((struct taskstats *) NLA_DATA(na));
513 if (print_task_context_switch_counts)
514 task_context_switch_counts((struct taskstats *) NLA_DATA(na));
516 if (write(fd, NLA_DATA(na), na->nla_len) < 0) {
517 err(1,"write error\n");
523 case TASKSTATS_TYPE_NULL:
526 fprintf(stderr, "Unknown nested"
531 len2 += NLA_ALIGN(na->nla_len);
532 na = (struct nlattr *)((char *)na +
533 NLA_ALIGN(na->nla_len));
537 case CGROUPSTATS_TYPE_CGROUP_STATS:
538 print_cgroupstats(NLA_DATA(na));
541 fprintf(stderr, "Unknown nla_type %d\n",
543 case TASKSTATS_TYPE_NULL:
546 na = (struct nlattr *) (GENLMSG_DATA(&msg) + len);
551 rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
552 TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK,
553 &cpumask, strlen(cpumask) + 1);
554 printf("Sent deregister mask, retval %d\n", rc);
556 err(rc, "error sending deregister cpumask\n");