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 28 #include <linux/genetlink.h> 29 #include <linux/taskstats.h> 30 #include <linux/cgroupstats.h> 31 32 /* 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 36 */ 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) 41 42 #define err(code, fmt, arg...) \ 43 do { \ 44 fprintf(stderr, fmt, ##arg); \ 45 exit(code); \ 46 } while (0) 47 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 55 #define PRINTF(fmt, arg...) { \ 56 if (dbg) { \ 57 printf(fmt, ##arg); \ 58 } \ 59 } 60 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 */ 64 #define MAX_CPUS 32 65 66 struct msgtemplate { 67 struct nlmsghdr n; 68 struct genlmsghdr g; 69 char buf[MAX_MSG_SIZE]; 70 }; 71 72 char cpumask[100+6*MAX_CPUS]; 73 74 static 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 * Create a raw netlink socket and bind 87 */ 88 static 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; 112 error: 113 close(fd); 114 return -1; 115 } 116 117 118 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) 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 + 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 * Probe the controller in genetlink to find the family id 160 * for the TASKSTATS family 161 */ 162 static 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; /* sendto() failure? */ 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 #define delay_ms(t) (t / 1000000ULL) 196 197 static void print_delayacct(struct taskstats *t) 198 { 199 printf("\n\nCPU %15s%15s%15s%15s%15s%15s%15s\n" 200 " %15llu%15llu%15llu%15llu%15.3fms%13.6fms%13.6fms\n" 201 "IO %15s%15s%15s%15s%15s\n" 202 " %15llu%15llu%15.3fms%13.6fms%13.6fms\n" 203 "SWAP %15s%15s%15s%15s%15s\n" 204 " %15llu%15llu%15.3fms%13.6fms%13.6fms\n" 205 "RECLAIM %12s%15s%15s%15s%15s\n" 206 " %15llu%15llu%15.3fms%13.6fms%13.6fms\n" 207 "THRASHING%12s%15s%15s%15s%15s\n" 208 " %15llu%15llu%15.3fms%13.6fms%13.6fms\n" 209 "COMPACT %12s%15s%15s%15s%15s\n" 210 " %15llu%15llu%15.3fms%13.6fms%13.6fms\n" 211 "WPCOPY %12s%15s%15s%15s%15s\n" 212 " %15llu%15llu%15.3fms%13.6fms%13.6fms\n" 213 "IRQ %15s%15s%15s%15s%15s\n" 214 " %15llu%15llu%15.3fms%13.6fms%13.6fms\n", 215 "count", "real total", "virtual total", 216 "delay total", "delay average", "delay max", "delay min", 217 (unsigned long long)t->cpu_count, 218 (unsigned long long)t->cpu_run_real_total, 219 (unsigned long long)t->cpu_run_virtual_total, 220 (unsigned long long)t->cpu_delay_total, 221 average_ms((double)t->cpu_delay_total, t->cpu_count), 222 delay_ms((double)t->cpu_delay_max), 223 delay_ms((double)t->cpu_delay_min), 224 "count", "delay total", "delay average", "delay max", "delay min", 225 (unsigned long long)t->blkio_count, 226 (unsigned long long)t->blkio_delay_total, 227 average_ms((double)t->blkio_delay_total, t->blkio_count), 228 delay_ms((double)t->blkio_delay_max), 229 delay_ms((double)t->blkio_delay_min), 230 "count", "delay total", "delay average", "delay max", "delay min", 231 (unsigned long long)t->swapin_count, 232 (unsigned long long)t->swapin_delay_total, 233 average_ms((double)t->swapin_delay_total, t->swapin_count), 234 delay_ms((double)t->swapin_delay_max), 235 delay_ms((double)t->swapin_delay_min), 236 "count", "delay total", "delay average", "delay max", "delay min", 237 (unsigned long long)t->freepages_count, 238 (unsigned long long)t->freepages_delay_total, 239 average_ms((double)t->freepages_delay_total, t->freepages_count), 240 delay_ms((double)t->freepages_delay_max), 241 delay_ms((double)t->freepages_delay_min), 242 "count", "delay total", "delay average", "delay max", "delay min", 243 (unsigned long long)t->thrashing_count, 244 (unsigned long long)t->thrashing_delay_total, 245 average_ms((double)t->thrashing_delay_total, t->thrashing_count), 246 delay_ms((double)t->thrashing_delay_max), 247 delay_ms((double)t->thrashing_delay_min), 248 "count", "delay total", "delay average", "delay max", "delay min", 249 (unsigned long long)t->compact_count, 250 (unsigned long long)t->compact_delay_total, 251 average_ms((double)t->compact_delay_total, t->compact_count), 252 delay_ms((double)t->compact_delay_max), 253 delay_ms((double)t->compact_delay_min), 254 "count", "delay total", "delay average", "delay max", "delay min", 255 (unsigned long long)t->wpcopy_count, 256 (unsigned long long)t->wpcopy_delay_total, 257 average_ms((double)t->wpcopy_delay_total, t->wpcopy_count), 258 delay_ms((double)t->wpcopy_delay_max), 259 delay_ms((double)t->wpcopy_delay_min), 260 "count", "delay total", "delay average", "delay max", "delay min", 261 (unsigned long long)t->irq_count, 262 (unsigned long long)t->irq_delay_total, 263 average_ms((double)t->irq_delay_total, t->irq_count), 264 delay_ms((double)t->irq_delay_max), 265 delay_ms((double)t->irq_delay_min)); 266 } 267 268 static void task_context_switch_counts(struct taskstats *t) 269 { 270 printf("\n\nTask %15s%15s\n" 271 " %15llu%15llu\n", 272 "voluntary", "nonvoluntary", 273 (unsigned long long)t->nvcsw, (unsigned long long)t->nivcsw); 274 } 275 276 static void print_cgroupstats(struct cgroupstats *c) 277 { 278 printf("sleeping %llu, blocked %llu, running %llu, stopped %llu, " 279 "uninterruptible %llu\n", (unsigned long long)c->nr_sleeping, 280 (unsigned long long)c->nr_io_wait, 281 (unsigned long long)c->nr_running, 282 (unsigned long long)c->nr_stopped, 283 (unsigned long long)c->nr_uninterruptible); 284 } 285 286 287 static void print_ioacct(struct taskstats *t) 288 { 289 printf("%s: read=%llu, write=%llu, cancelled_write=%llu\n", 290 t->ac_comm, 291 (unsigned long long)t->read_bytes, 292 (unsigned long long)t->write_bytes, 293 (unsigned long long)t->cancelled_write_bytes); 294 } 295 296 int main(int argc, char *argv[]) 297 { 298 int c, rc, rep_len, aggr_len, len2; 299 int cmd_type = TASKSTATS_CMD_ATTR_UNSPEC; 300 __u16 id; 301 __u32 mypid; 302 303 struct nlattr *na; 304 int nl_sd = -1; 305 int len = 0; 306 pid_t tid = 0; 307 pid_t rtid = 0; 308 309 int fd = 0; 310 int write_file = 0; 311 int maskset = 0; 312 char *logfile = NULL; 313 int loop = 0; 314 int containerset = 0; 315 char *containerpath = NULL; 316 int cfd = 0; 317 int forking = 0; 318 sigset_t sigset; 319 320 struct msgtemplate msg; 321 322 while (!forking) { 323 c = getopt(argc, argv, "qdiw:r:m:t:p:vlC:c:"); 324 if (c < 0) 325 break; 326 327 switch (c) { 328 case 'd': 329 printf("print delayacct stats ON\n"); 330 print_delays = 1; 331 break; 332 case 'i': 333 printf("printing IO accounting\n"); 334 print_io_accounting = 1; 335 break; 336 case 'q': 337 printf("printing task/process context switch rates\n"); 338 print_task_context_switch_counts = 1; 339 break; 340 case 'C': 341 containerset = 1; 342 containerpath = optarg; 343 break; 344 case 'w': 345 logfile = strdup(optarg); 346 printf("write to file %s\n", logfile); 347 write_file = 1; 348 break; 349 case 'r': 350 rcvbufsz = atoi(optarg); 351 printf("receive buf size %d\n", rcvbufsz); 352 if (rcvbufsz < 0) 353 err(1, "Invalid rcv buf size\n"); 354 break; 355 case 'm': 356 strncpy(cpumask, optarg, sizeof(cpumask)); 357 cpumask[sizeof(cpumask) - 1] = '\0'; 358 maskset = 1; 359 printf("cpumask %s maskset %d\n", cpumask, maskset); 360 break; 361 case 't': 362 tid = atoi(optarg); 363 if (!tid) 364 err(1, "Invalid tgid\n"); 365 cmd_type = TASKSTATS_CMD_ATTR_TGID; 366 break; 367 case 'p': 368 tid = atoi(optarg); 369 if (!tid) 370 err(1, "Invalid pid\n"); 371 cmd_type = TASKSTATS_CMD_ATTR_PID; 372 break; 373 case 'c': 374 375 /* Block SIGCHLD for sigwait() later */ 376 if (sigemptyset(&sigset) == -1) 377 err(1, "Failed to empty sigset"); 378 if (sigaddset(&sigset, SIGCHLD)) 379 err(1, "Failed to set sigchld in sigset"); 380 sigprocmask(SIG_BLOCK, &sigset, NULL); 381 382 /* fork/exec a child */ 383 tid = fork(); 384 if (tid < 0) 385 err(1, "Fork failed\n"); 386 if (tid == 0) 387 if (execvp(argv[optind - 1], 388 &argv[optind - 1]) < 0) 389 exit(-1); 390 391 /* Set the command type and avoid further processing */ 392 cmd_type = TASKSTATS_CMD_ATTR_PID; 393 forking = 1; 394 break; 395 case 'v': 396 printf("debug on\n"); 397 dbg = 1; 398 break; 399 case 'l': 400 printf("listen forever\n"); 401 loop = 1; 402 break; 403 default: 404 usage(); 405 exit(-1); 406 } 407 } 408 409 if (write_file) { 410 fd = open(logfile, O_WRONLY | O_CREAT | O_TRUNC, 411 S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH); 412 if (fd == -1) { 413 perror("Cannot open output file\n"); 414 exit(1); 415 } 416 } 417 418 nl_sd = create_nl_socket(NETLINK_GENERIC); 419 if (nl_sd < 0) 420 err(1, "error creating Netlink socket\n"); 421 422 423 mypid = getpid(); 424 id = get_family_id(nl_sd); 425 if (!id) { 426 fprintf(stderr, "Error getting family id, errno %d\n", errno); 427 goto err; 428 } 429 PRINTF("family id %d\n", id); 430 431 if (maskset) { 432 rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET, 433 TASKSTATS_CMD_ATTR_REGISTER_CPUMASK, 434 &cpumask, strlen(cpumask) + 1); 435 PRINTF("Sent register cpumask, retval %d\n", rc); 436 if (rc < 0) { 437 fprintf(stderr, "error sending register cpumask\n"); 438 goto err; 439 } 440 } 441 442 if (tid && containerset) { 443 fprintf(stderr, "Select either -t or -C, not both\n"); 444 goto err; 445 } 446 447 /* 448 * If we forked a child, wait for it to exit. Cannot use waitpid() 449 * as all the delicious data would be reaped as part of the wait 450 */ 451 if (tid && forking) { 452 int sig_received; 453 sigwait(&sigset, &sig_received); 454 } 455 456 if (tid) { 457 rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET, 458 cmd_type, &tid, sizeof(__u32)); 459 PRINTF("Sent pid/tgid, retval %d\n", rc); 460 if (rc < 0) { 461 fprintf(stderr, "error sending tid/tgid cmd\n"); 462 goto done; 463 } 464 } 465 466 if (containerset) { 467 cfd = open(containerpath, O_RDONLY); 468 if (cfd < 0) { 469 perror("error opening container file"); 470 goto err; 471 } 472 rc = send_cmd(nl_sd, id, mypid, CGROUPSTATS_CMD_GET, 473 CGROUPSTATS_CMD_ATTR_FD, &cfd, sizeof(__u32)); 474 if (rc < 0) { 475 perror("error sending cgroupstats command"); 476 goto err; 477 } 478 } 479 if (!maskset && !tid && !containerset) { 480 usage(); 481 goto err; 482 } 483 484 do { 485 rep_len = recv(nl_sd, &msg, sizeof(msg), 0); 486 PRINTF("received %d bytes\n", rep_len); 487 488 if (rep_len < 0) { 489 fprintf(stderr, "nonfatal reply error: errno %d\n", 490 errno); 491 continue; 492 } 493 if (msg.n.nlmsg_type == NLMSG_ERROR || 494 !NLMSG_OK((&msg.n), rep_len)) { 495 struct nlmsgerr *err = NLMSG_DATA(&msg); 496 fprintf(stderr, "fatal reply error, errno %d\n", 497 err->error); 498 goto done; 499 } 500 501 PRINTF("nlmsghdr size=%zu, nlmsg_len=%d, rep_len=%d\n", 502 sizeof(struct nlmsghdr), msg.n.nlmsg_len, rep_len); 503 504 505 rep_len = GENLMSG_PAYLOAD(&msg.n); 506 507 na = (struct nlattr *) GENLMSG_DATA(&msg); 508 len = 0; 509 while (len < rep_len) { 510 len += NLA_ALIGN(na->nla_len); 511 switch (na->nla_type) { 512 case TASKSTATS_TYPE_AGGR_TGID: 513 /* Fall through */ 514 case TASKSTATS_TYPE_AGGR_PID: 515 aggr_len = NLA_PAYLOAD(na->nla_len); 516 len2 = 0; 517 /* For nested attributes, na follows */ 518 na = (struct nlattr *) NLA_DATA(na); 519 while (len2 < aggr_len) { 520 switch (na->nla_type) { 521 case TASKSTATS_TYPE_PID: 522 rtid = *(int *) NLA_DATA(na); 523 if (print_delays) 524 printf("PID\t%d\n", rtid); 525 break; 526 case TASKSTATS_TYPE_TGID: 527 rtid = *(int *) NLA_DATA(na); 528 if (print_delays) 529 printf("TGID\t%d\n", rtid); 530 break; 531 case TASKSTATS_TYPE_STATS: 532 if (print_delays) 533 print_delayacct((struct taskstats *) NLA_DATA(na)); 534 if (print_io_accounting) 535 print_ioacct((struct taskstats *) NLA_DATA(na)); 536 if (print_task_context_switch_counts) 537 task_context_switch_counts((struct taskstats *) NLA_DATA(na)); 538 if (fd) { 539 if (write(fd, NLA_DATA(na), na->nla_len) < 0) { 540 err(1,"write error\n"); 541 } 542 } 543 if (!loop) 544 goto done; 545 break; 546 case TASKSTATS_TYPE_NULL: 547 break; 548 default: 549 fprintf(stderr, "Unknown nested" 550 " nla_type %d\n", 551 na->nla_type); 552 break; 553 } 554 len2 += NLA_ALIGN(na->nla_len); 555 na = (struct nlattr *)((char *)na + 556 NLA_ALIGN(na->nla_len)); 557 } 558 break; 559 560 case CGROUPSTATS_TYPE_CGROUP_STATS: 561 print_cgroupstats(NLA_DATA(na)); 562 break; 563 default: 564 fprintf(stderr, "Unknown nla_type %d\n", 565 na->nla_type); 566 case TASKSTATS_TYPE_NULL: 567 break; 568 } 569 na = (struct nlattr *) (GENLMSG_DATA(&msg) + len); 570 } 571 } while (loop); 572 done: 573 if (maskset) { 574 rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET, 575 TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK, 576 &cpumask, strlen(cpumask) + 1); 577 printf("Sent deregister mask, retval %d\n", rc); 578 if (rc < 0) 579 err(rc, "error sending deregister cpumask\n"); 580 } 581 err: 582 close(nl_sd); 583 if (fd) 584 close(fd); 585 if (cfd) 586 close(cfd); 587 return 0; 588 } 589