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)) 195 196 static 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%15.3fms\n" 202 "SWAP %15s%15s%15s\n" 203 " %15llu%15llu%15.3fms\n" 204 "RECLAIM %12s%15s%15s\n" 205 " %15llu%15llu%15.3fms\n" 206 "THRASHING%12s%15s%15s\n" 207 " %15llu%15llu%15.3fms\n" 208 "COMPACT %12s%15s%15s\n" 209 " %15llu%15llu%15.3fms\n" 210 "WPCOPY %12s%15s%15s\n" 211 " %15llu%15llu%15.3fms\n" 212 "IRQ %15s%15s%15s\n" 213 " %15llu%15llu%15.3fms\n", 214 "count", "real total", "virtual total", 215 "delay total", "delay average", 216 (unsigned long long)t->cpu_count, 217 (unsigned long long)t->cpu_run_real_total, 218 (unsigned long long)t->cpu_run_virtual_total, 219 (unsigned long long)t->cpu_delay_total, 220 average_ms((double)t->cpu_delay_total, t->cpu_count), 221 "count", "delay total", "delay average", 222 (unsigned long long)t->blkio_count, 223 (unsigned long long)t->blkio_delay_total, 224 average_ms((double)t->blkio_delay_total, t->blkio_count), 225 "count", "delay total", "delay average", 226 (unsigned long long)t->swapin_count, 227 (unsigned long long)t->swapin_delay_total, 228 average_ms((double)t->swapin_delay_total, t->swapin_count), 229 "count", "delay total", "delay average", 230 (unsigned long long)t->freepages_count, 231 (unsigned long long)t->freepages_delay_total, 232 average_ms((double)t->freepages_delay_total, t->freepages_count), 233 "count", "delay total", "delay average", 234 (unsigned long long)t->thrashing_count, 235 (unsigned long long)t->thrashing_delay_total, 236 average_ms((double)t->thrashing_delay_total, t->thrashing_count), 237 "count", "delay total", "delay average", 238 (unsigned long long)t->compact_count, 239 (unsigned long long)t->compact_delay_total, 240 average_ms((double)t->compact_delay_total, t->compact_count), 241 "count", "delay total", "delay average", 242 (unsigned long long)t->wpcopy_count, 243 (unsigned long long)t->wpcopy_delay_total, 244 average_ms((double)t->wpcopy_delay_total, t->wpcopy_count), 245 "count", "delay total", "delay average", 246 (unsigned long long)t->irq_count, 247 (unsigned long long)t->irq_delay_total, 248 average_ms((double)t->irq_delay_total, t->irq_count)); 249 } 250 251 static void task_context_switch_counts(struct taskstats *t) 252 { 253 printf("\n\nTask %15s%15s\n" 254 " %15llu%15llu\n", 255 "voluntary", "nonvoluntary", 256 (unsigned long long)t->nvcsw, (unsigned long long)t->nivcsw); 257 } 258 259 static void print_cgroupstats(struct cgroupstats *c) 260 { 261 printf("sleeping %llu, blocked %llu, running %llu, stopped %llu, " 262 "uninterruptible %llu\n", (unsigned long long)c->nr_sleeping, 263 (unsigned long long)c->nr_io_wait, 264 (unsigned long long)c->nr_running, 265 (unsigned long long)c->nr_stopped, 266 (unsigned long long)c->nr_uninterruptible); 267 } 268 269 270 static void print_ioacct(struct taskstats *t) 271 { 272 printf("%s: read=%llu, write=%llu, cancelled_write=%llu\n", 273 t->ac_comm, 274 (unsigned long long)t->read_bytes, 275 (unsigned long long)t->write_bytes, 276 (unsigned long long)t->cancelled_write_bytes); 277 } 278 279 int main(int argc, char *argv[]) 280 { 281 int c, rc, rep_len, aggr_len, len2; 282 int cmd_type = TASKSTATS_CMD_ATTR_UNSPEC; 283 __u16 id; 284 __u32 mypid; 285 286 struct nlattr *na; 287 int nl_sd = -1; 288 int len = 0; 289 pid_t tid = 0; 290 pid_t rtid = 0; 291 292 int fd = 0; 293 int write_file = 0; 294 int maskset = 0; 295 char *logfile = NULL; 296 int loop = 0; 297 int containerset = 0; 298 char *containerpath = NULL; 299 int cfd = 0; 300 int forking = 0; 301 sigset_t sigset; 302 303 struct msgtemplate msg; 304 305 while (!forking) { 306 c = getopt(argc, argv, "qdiw:r:m:t:p:vlC:c:"); 307 if (c < 0) 308 break; 309 310 switch (c) { 311 case 'd': 312 printf("print delayacct stats ON\n"); 313 print_delays = 1; 314 break; 315 case 'i': 316 printf("printing IO accounting\n"); 317 print_io_accounting = 1; 318 break; 319 case 'q': 320 printf("printing task/process context switch rates\n"); 321 print_task_context_switch_counts = 1; 322 break; 323 case 'C': 324 containerset = 1; 325 containerpath = optarg; 326 break; 327 case 'w': 328 logfile = strdup(optarg); 329 printf("write to file %s\n", logfile); 330 write_file = 1; 331 break; 332 case 'r': 333 rcvbufsz = atoi(optarg); 334 printf("receive buf size %d\n", rcvbufsz); 335 if (rcvbufsz < 0) 336 err(1, "Invalid rcv buf size\n"); 337 break; 338 case 'm': 339 strncpy(cpumask, optarg, sizeof(cpumask)); 340 cpumask[sizeof(cpumask) - 1] = '\0'; 341 maskset = 1; 342 printf("cpumask %s maskset %d\n", cpumask, maskset); 343 break; 344 case 't': 345 tid = atoi(optarg); 346 if (!tid) 347 err(1, "Invalid tgid\n"); 348 cmd_type = TASKSTATS_CMD_ATTR_TGID; 349 break; 350 case 'p': 351 tid = atoi(optarg); 352 if (!tid) 353 err(1, "Invalid pid\n"); 354 cmd_type = TASKSTATS_CMD_ATTR_PID; 355 break; 356 case 'c': 357 358 /* Block SIGCHLD for sigwait() later */ 359 if (sigemptyset(&sigset) == -1) 360 err(1, "Failed to empty sigset"); 361 if (sigaddset(&sigset, SIGCHLD)) 362 err(1, "Failed to set sigchld in sigset"); 363 sigprocmask(SIG_BLOCK, &sigset, NULL); 364 365 /* fork/exec a child */ 366 tid = fork(); 367 if (tid < 0) 368 err(1, "Fork failed\n"); 369 if (tid == 0) 370 if (execvp(argv[optind - 1], 371 &argv[optind - 1]) < 0) 372 exit(-1); 373 374 /* Set the command type and avoid further processing */ 375 cmd_type = TASKSTATS_CMD_ATTR_PID; 376 forking = 1; 377 break; 378 case 'v': 379 printf("debug on\n"); 380 dbg = 1; 381 break; 382 case 'l': 383 printf("listen forever\n"); 384 loop = 1; 385 break; 386 default: 387 usage(); 388 exit(-1); 389 } 390 } 391 392 if (write_file) { 393 fd = open(logfile, O_WRONLY | O_CREAT | O_TRUNC, 394 S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH); 395 if (fd == -1) { 396 perror("Cannot open output file\n"); 397 exit(1); 398 } 399 } 400 401 nl_sd = create_nl_socket(NETLINK_GENERIC); 402 if (nl_sd < 0) 403 err(1, "error creating Netlink socket\n"); 404 405 406 mypid = getpid(); 407 id = get_family_id(nl_sd); 408 if (!id) { 409 fprintf(stderr, "Error getting family id, errno %d\n", errno); 410 goto err; 411 } 412 PRINTF("family id %d\n", id); 413 414 if (maskset) { 415 rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET, 416 TASKSTATS_CMD_ATTR_REGISTER_CPUMASK, 417 &cpumask, strlen(cpumask) + 1); 418 PRINTF("Sent register cpumask, retval %d\n", rc); 419 if (rc < 0) { 420 fprintf(stderr, "error sending register cpumask\n"); 421 goto err; 422 } 423 } 424 425 if (tid && containerset) { 426 fprintf(stderr, "Select either -t or -C, not both\n"); 427 goto err; 428 } 429 430 /* 431 * If we forked a child, wait for it to exit. Cannot use waitpid() 432 * as all the delicious data would be reaped as part of the wait 433 */ 434 if (tid && forking) { 435 int sig_received; 436 sigwait(&sigset, &sig_received); 437 } 438 439 if (tid) { 440 rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET, 441 cmd_type, &tid, sizeof(__u32)); 442 PRINTF("Sent pid/tgid, retval %d\n", rc); 443 if (rc < 0) { 444 fprintf(stderr, "error sending tid/tgid cmd\n"); 445 goto done; 446 } 447 } 448 449 if (containerset) { 450 cfd = open(containerpath, O_RDONLY); 451 if (cfd < 0) { 452 perror("error opening container file"); 453 goto err; 454 } 455 rc = send_cmd(nl_sd, id, mypid, CGROUPSTATS_CMD_GET, 456 CGROUPSTATS_CMD_ATTR_FD, &cfd, sizeof(__u32)); 457 if (rc < 0) { 458 perror("error sending cgroupstats command"); 459 goto err; 460 } 461 } 462 if (!maskset && !tid && !containerset) { 463 usage(); 464 goto err; 465 } 466 467 do { 468 rep_len = recv(nl_sd, &msg, sizeof(msg), 0); 469 PRINTF("received %d bytes\n", rep_len); 470 471 if (rep_len < 0) { 472 fprintf(stderr, "nonfatal reply error: errno %d\n", 473 errno); 474 continue; 475 } 476 if (msg.n.nlmsg_type == NLMSG_ERROR || 477 !NLMSG_OK((&msg.n), rep_len)) { 478 struct nlmsgerr *err = NLMSG_DATA(&msg); 479 fprintf(stderr, "fatal reply error, errno %d\n", 480 err->error); 481 goto done; 482 } 483 484 PRINTF("nlmsghdr size=%zu, nlmsg_len=%d, rep_len=%d\n", 485 sizeof(struct nlmsghdr), msg.n.nlmsg_len, rep_len); 486 487 488 rep_len = GENLMSG_PAYLOAD(&msg.n); 489 490 na = (struct nlattr *) GENLMSG_DATA(&msg); 491 len = 0; 492 while (len < rep_len) { 493 len += NLA_ALIGN(na->nla_len); 494 switch (na->nla_type) { 495 case TASKSTATS_TYPE_AGGR_TGID: 496 /* Fall through */ 497 case TASKSTATS_TYPE_AGGR_PID: 498 aggr_len = NLA_PAYLOAD(na->nla_len); 499 len2 = 0; 500 /* For nested attributes, na follows */ 501 na = (struct nlattr *) NLA_DATA(na); 502 while (len2 < aggr_len) { 503 switch (na->nla_type) { 504 case TASKSTATS_TYPE_PID: 505 rtid = *(int *) NLA_DATA(na); 506 if (print_delays) 507 printf("PID\t%d\n", rtid); 508 break; 509 case TASKSTATS_TYPE_TGID: 510 rtid = *(int *) NLA_DATA(na); 511 if (print_delays) 512 printf("TGID\t%d\n", rtid); 513 break; 514 case TASKSTATS_TYPE_STATS: 515 if (print_delays) 516 print_delayacct((struct taskstats *) NLA_DATA(na)); 517 if (print_io_accounting) 518 print_ioacct((struct taskstats *) NLA_DATA(na)); 519 if (print_task_context_switch_counts) 520 task_context_switch_counts((struct taskstats *) NLA_DATA(na)); 521 if (fd) { 522 if (write(fd, NLA_DATA(na), na->nla_len) < 0) { 523 err(1,"write error\n"); 524 } 525 } 526 if (!loop) 527 goto done; 528 break; 529 case TASKSTATS_TYPE_NULL: 530 break; 531 default: 532 fprintf(stderr, "Unknown nested" 533 " nla_type %d\n", 534 na->nla_type); 535 break; 536 } 537 len2 += NLA_ALIGN(na->nla_len); 538 na = (struct nlattr *)((char *)na + 539 NLA_ALIGN(na->nla_len)); 540 } 541 break; 542 543 case CGROUPSTATS_TYPE_CGROUP_STATS: 544 print_cgroupstats(NLA_DATA(na)); 545 break; 546 default: 547 fprintf(stderr, "Unknown nla_type %d\n", 548 na->nla_type); 549 case TASKSTATS_TYPE_NULL: 550 break; 551 } 552 na = (struct nlattr *) (GENLMSG_DATA(&msg) + len); 553 } 554 } while (loop); 555 done: 556 if (maskset) { 557 rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET, 558 TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK, 559 &cpumask, strlen(cpumask) + 1); 560 printf("Sent deregister mask, retval %d\n", rc); 561 if (rc < 0) 562 err(rc, "error sending deregister cpumask\n"); 563 } 564 err: 565 close(nl_sd); 566 if (fd) 567 close(fd); 568 if (cfd) 569 close(cfd); 570 return 0; 571 } 572