1 /*- 2 * Copyright (c) 2003-2005, Joseph Koshy 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <sys/types.h> 31 #include <sys/event.h> 32 #include <sys/queue.h> 33 #include <sys/socket.h> 34 #include <sys/stat.h> 35 #include <sys/time.h> 36 #include <sys/ttycom.h> 37 #include <sys/wait.h> 38 39 #include <assert.h> 40 #include <err.h> 41 #include <errno.h> 42 #include <fcntl.h> 43 #include <limits.h> 44 #include <math.h> 45 #include <pmc.h> 46 #include <pmclog.h> 47 #include <signal.h> 48 #include <stdarg.h> 49 #include <stdint.h> 50 #include <stdio.h> 51 #include <stdlib.h> 52 #include <string.h> 53 #include <sysexits.h> 54 #include <unistd.h> 55 56 #include "pmcstat.h" 57 58 /* 59 * A given invocation of pmcstat(8) can manage multiple PMCs of both 60 * the system-wide and per-process variety. Each of these could be in 61 * 'counting mode' or in 'sampling mode'. 62 * 63 * For 'counting mode' PMCs, pmcstat(8) will periodically issue a 64 * pmc_read() at the configured time interval and print out the value 65 * of the requested PMCs. 66 * 67 * For 'sampling mode' PMCs it can log to a file for offline analysis, 68 * or can analyse sampling data "on the fly", either by converting 69 * samples to printed textual form or by creating gprof(1) compatible 70 * profiles, one per program executed. When creating gprof(1) 71 * profiles it can optionally merge entries from multiple processes 72 * for a given executable into a single profile file. 73 */ 74 75 /* Globals */ 76 77 int pmcstat_interrupt = 0; 78 int pmcstat_displayheight = DEFAULT_DISPLAY_HEIGHT; 79 int pmcstat_pipefd[NPIPEFD]; 80 int pmcstat_kq; 81 82 /* 83 * cleanup 84 */ 85 86 void 87 pmcstat_cleanup(struct pmcstat_args *a) 88 { 89 struct pmcstat_ev *ev, *tmp; 90 91 /* release allocated PMCs. */ 92 STAILQ_FOREACH_SAFE(ev, &a->pa_head, ev_next, tmp) 93 if (ev->ev_pmcid != PMC_ID_INVALID) { 94 if (pmc_release(ev->ev_pmcid) < 0) 95 err(EX_OSERR, "ERROR: cannot release pmc " 96 "0x%x \"%s\"", ev->ev_pmcid, ev->ev_name); 97 free(ev->ev_name); 98 free(ev->ev_spec); 99 STAILQ_REMOVE(&a->pa_head, ev, pmcstat_ev, ev_next); 100 free(ev); 101 } 102 103 /* de-configure the log file if present. */ 104 if (a->pa_flags & (FLAG_HAS_PIPE | FLAG_HAS_OUTPUT_LOGFILE)) 105 (void) pmc_configure_logfile(-1); 106 107 if (a->pa_logparser) { 108 pmclog_close(a->pa_logparser); 109 a->pa_logparser = NULL; 110 } 111 112 if (a->pa_flags & (FLAG_HAS_PIPE | FLAG_HAS_OUTPUT_LOGFILE)) 113 pmcstat_shutdown_logging(); 114 } 115 116 void 117 pmcstat_start_pmcs(struct pmcstat_args *a) 118 { 119 struct pmcstat_ev *ev; 120 121 STAILQ_FOREACH(ev, &args.pa_head, ev_next) { 122 123 assert(ev->ev_pmcid != PMC_ID_INVALID); 124 125 if (pmc_start(ev->ev_pmcid) < 0) { 126 warn("ERROR: Cannot start pmc 0x%x \"%s\"", 127 ev->ev_pmcid, ev->ev_name); 128 pmcstat_cleanup(a); 129 exit(EX_OSERR); 130 } 131 } 132 133 } 134 135 void 136 pmcstat_print_headers(struct pmcstat_args *a) 137 { 138 struct pmcstat_ev *ev; 139 int c; 140 141 (void) fprintf(a->pa_printfile, PRINT_HEADER_PREFIX); 142 143 STAILQ_FOREACH(ev, &a->pa_head, ev_next) { 144 if (PMC_IS_SAMPLING_MODE(ev->ev_mode)) 145 continue; 146 147 c = PMC_IS_SYSTEM_MODE(ev->ev_mode) ? 's' : 'p'; 148 149 if (ev->ev_fieldskip != 0) { 150 (void) fprintf(a->pa_printfile, "%*s%c/%*s ", 151 ev->ev_fieldskip, "", c, 152 ev->ev_fieldwidth - ev->ev_fieldskip - 2, 153 ev->ev_name); 154 } else 155 (void) fprintf(a->pa_printfile, "%c/%*s ", 156 c, ev->ev_fieldwidth - 2, ev->ev_name); 157 } 158 159 (void) fflush(a->pa_printfile); 160 } 161 162 void 163 pmcstat_print_counters(struct pmcstat_args *a) 164 { 165 int extra_width; 166 struct pmcstat_ev *ev; 167 pmc_value_t value; 168 169 extra_width = sizeof(PRINT_HEADER_PREFIX) - 1; 170 171 STAILQ_FOREACH(ev, &a->pa_head, ev_next) { 172 173 /* skip sampling mode counters */ 174 if (PMC_IS_SAMPLING_MODE(ev->ev_mode)) 175 continue; 176 177 if (pmc_read(ev->ev_pmcid, &value) < 0) 178 err(EX_OSERR, "ERROR: Cannot read pmc " 179 "\"%s\"", ev->ev_name); 180 181 (void) fprintf(a->pa_printfile, "%*ju ", 182 ev->ev_fieldwidth + extra_width, 183 (uintmax_t) ev->ev_cumulative ? value : 184 (value - ev->ev_saved)); 185 186 if (ev->ev_cumulative == 0) 187 ev->ev_saved = value; 188 extra_width = 0; 189 } 190 191 (void) fflush(a->pa_printfile); 192 } 193 194 /* 195 * Print output 196 */ 197 198 void 199 pmcstat_print_pmcs(struct pmcstat_args *a) 200 { 201 static int linecount = 0; 202 203 /* check if we need to print a header line */ 204 if (++linecount > pmcstat_displayheight) { 205 (void) fprintf(a->pa_printfile, "\n"); 206 linecount = 1; 207 } 208 if (linecount == 1) 209 pmcstat_print_headers(a); 210 (void) fprintf(a->pa_printfile, "\n"); 211 212 pmcstat_print_counters(a); 213 214 return; 215 } 216 217 /* 218 * Do process profiling 219 * 220 * If a pid was specified, attach each allocated PMC to the target 221 * process. Otherwise, fork a child and attach the PMCs to the child, 222 * and have the child exec() the target program. 223 */ 224 225 void 226 pmcstat_setup_process(struct pmcstat_args *a) 227 { 228 char token; 229 struct pmcstat_ev *ev; 230 struct kevent kev; 231 232 if (a->pa_flags & FLAG_HAS_PID) { 233 STAILQ_FOREACH(ev, &a->pa_head, ev_next) 234 if (pmc_attach(ev->ev_pmcid, a->pa_pid) != 0) 235 err(EX_OSERR, "ERROR: cannot attach pmc \"%s\" to " 236 "process %d", ev->ev_name, (int) a->pa_pid); 237 } else { 238 239 /* 240 * We need to fork a new process and startup the child 241 * using execvp(). Before doing the exec() the child 242 * process reads its pipe for a token so that the parent 243 * can finish doing its pmc_attach() calls. 244 */ 245 if (pipe(pmcstat_pipefd) < 0) 246 err(EX_OSERR, "ERROR: cannot create pipe"); 247 248 switch (a->pa_pid = fork()) { 249 case -1: 250 err(EX_OSERR, "ERROR: cannot fork"); 251 /*NOTREACHED*/ 252 253 case 0: /* child */ 254 255 /* wait for our parent to signal us */ 256 (void) close(pmcstat_pipefd[WRITEPIPEFD]); 257 if (read(pmcstat_pipefd[READPIPEFD], &token, 1) < 0) 258 err(EX_OSERR, "ERROR (child): cannot read " 259 "token"); 260 (void) close(pmcstat_pipefd[READPIPEFD]); 261 262 /* exec() the program requested */ 263 execvp(*a->pa_argv, a->pa_argv); 264 /* and if that fails, notify the parent */ 265 kill(getppid(), SIGCHLD); 266 err(EX_OSERR, "ERROR: execvp \"%s\" failed", 267 *a->pa_argv); 268 /*NOTREACHED*/ 269 270 default: /* parent */ 271 272 (void) close(pmcstat_pipefd[READPIPEFD]); 273 274 /* attach all our PMCs to the child */ 275 STAILQ_FOREACH(ev, &args.pa_head, ev_next) 276 if (PMC_IS_VIRTUAL_MODE(ev->ev_mode) && 277 pmc_attach(ev->ev_pmcid, a->pa_pid) != 0) 278 err(EX_OSERR, "ERROR: cannot attach pmc " 279 "\"%s\" to process %d", ev->ev_name, 280 (int) a->pa_pid); 281 282 } 283 } 284 285 /* Ask to be notified via a kevent when the target process exits */ 286 EV_SET(&kev, a->pa_pid, EVFILT_PROC, EV_ADD|EV_ONESHOT, NOTE_EXIT, 0, 287 NULL); 288 if (kevent(pmcstat_kq, &kev, 1, NULL, 0, NULL) < 0) 289 err(EX_OSERR, "ERROR: cannot monitor child process %d", 290 a->pa_pid); 291 return; 292 } 293 294 void 295 pmcstat_start_process(struct pmcstat_args *a) 296 { 297 298 /* nothing to do: target is already running */ 299 if (a->pa_flags & FLAG_HAS_PID) 300 return; 301 302 /* write token to child to state that we are ready */ 303 if (write(pmcstat_pipefd[WRITEPIPEFD], "+", 1) != 1) 304 err(EX_OSERR, "ERROR: write failed"); 305 306 (void) close(pmcstat_pipefd[WRITEPIPEFD]); 307 } 308 309 void 310 pmcstat_show_usage(void) 311 { 312 errx(EX_USAGE, 313 "[options] [commandline]\n" 314 "\t Measure process and/or system performance using hardware\n" 315 "\t performance monitoring counters.\n" 316 "\t Options include:\n" 317 "\t -C\t\t (toggle) show cumulative counts\n" 318 "\t -D path\t create profiles in directory \"path\"\n" 319 "\t -E\t\t (toggle) show counts at process exit\n" 320 "\t -O file\t send log output to \"file\"\n" 321 "\t -P spec\t allocate a process-private sampling PMC\n" 322 "\t -R file\t read events from \"file\"\n" 323 "\t -S spec\t allocate a system-wide sampling PMC\n" 324 "\t -W\t\t (toggle) show counts per context switch\n" 325 "\t -c cpu\t\t set cpu for subsequent system-wide PMCs\n" 326 "\t -d\t\t (toggle) track descendants\n" 327 "\t -g\t\t produce gprof(1) compatible profiles\n" 328 "\t -n rate\t set sampling rate\n" 329 "\t -o file\t send print output to \"file\"\n" 330 "\t -p spec\t allocate a process-private counting PMC\n" 331 "\t -s spec\t allocate a system-wide counting PMC\n" 332 "\t -t pid\t\t attach to running process with pid \"pid\"\n" 333 "\t -w secs\t set printing time interval" 334 ); 335 } 336 337 /* 338 * Main 339 */ 340 341 int 342 main(int argc, char **argv) 343 { 344 double interval; 345 int option, npmc, ncpu; 346 int c, current_cpu, current_sampling_count; 347 int do_print, do_descendants; 348 int do_logproccsw, do_logprocexit; 349 int pipefd[2]; 350 int use_cumulative_counts; 351 pid_t pid; 352 char *end; 353 const char *errmsg; 354 enum pmcstat_state runstate; 355 struct pmcstat_ev *ev; 356 struct sigaction sa; 357 struct kevent kev; 358 struct winsize ws; 359 struct stat sb; 360 361 current_cpu = 0; 362 current_sampling_count = DEFAULT_SAMPLE_COUNT; 363 do_descendants = 0; 364 do_logproccsw = 0; 365 do_logprocexit = 0; 366 use_cumulative_counts = 0; 367 args.pa_required = 0; 368 args.pa_flags = 0; 369 args.pa_pid = (pid_t) -1; 370 args.pa_logfd = -1; 371 args.pa_samplesdir = "."; 372 args.pa_kernel = "/boot/kernel/kernel"; 373 args.pa_printfile = stderr; 374 args.pa_interval = DEFAULT_WAIT_INTERVAL; 375 STAILQ_INIT(&args.pa_head); 376 377 ev = NULL; 378 379 while ((option = getopt(argc, argv, "CD:EO:P:R:S:Wc:dgk:n:o:p:s:t:w:")) 380 != -1) 381 switch (option) { 382 case 'C': /* cumulative values */ 383 use_cumulative_counts = !use_cumulative_counts; 384 args.pa_required |= FLAG_HAS_COUNTING_PMCS; 385 break; 386 387 case 'c': /* CPU */ 388 current_cpu = strtol(optarg, &end, 0); 389 if (*end != '\0' || current_cpu < 0) 390 errx(EX_USAGE, 391 "ERROR: Illegal CPU number \"%s\".", 392 optarg); 393 args.pa_required |= FLAG_HAS_SYSTEM_PMCS; 394 break; 395 396 case 'D': 397 if (stat(optarg, &sb) < 0) 398 err(EX_OSERR, "ERROR: Cannot stat \"%s\"", 399 optarg); 400 if (!S_ISDIR(sb.st_mode)) 401 errx(EX_USAGE, "ERROR: \"%s\" is not a " 402 "directory", optarg); 403 args.pa_samplesdir = optarg; 404 args.pa_flags |= FLAG_HAS_SAMPLESDIR; 405 args.pa_required |= FLAG_DO_GPROF; 406 break; 407 408 case 'd': /* toggle descendents */ 409 do_descendants = !do_descendants; 410 args.pa_required |= FLAG_HAS_PROCESS_PMCS; 411 break; 412 413 case 'g': /* produce gprof compatible profiles */ 414 args.pa_flags |= FLAG_DO_GPROF; 415 break; 416 417 case 'k': /* pathname to the kernel */ 418 args.pa_kernel = optarg; 419 args.pa_required |= FLAG_DO_GPROF; 420 args.pa_flags |= FLAG_HAS_KERNELPATH; 421 break; 422 423 case 'E': /* log process exit */ 424 do_logprocexit = !do_logprocexit; 425 args.pa_required |= (FLAG_HAS_PROCESS_PMCS | 426 FLAG_HAS_COUNTING_PMCS | FLAG_HAS_OUTPUT_LOGFILE); 427 break; 428 429 case 'p': /* process virtual counting PMC */ 430 case 's': /* system-wide counting PMC */ 431 case 'P': /* process virtual sampling PMC */ 432 case 'S': /* system-wide sampling PMC */ 433 if ((ev = malloc(sizeof(*ev))) == NULL) 434 errx(EX_SOFTWARE, "ERROR: Out of memory."); 435 436 switch (option) { 437 case 'p': ev->ev_mode = PMC_MODE_TC; break; 438 case 's': ev->ev_mode = PMC_MODE_SC; break; 439 case 'P': ev->ev_mode = PMC_MODE_TS; break; 440 case 'S': ev->ev_mode = PMC_MODE_SS; break; 441 } 442 443 if (option == 'P' || option == 'p') { 444 args.pa_flags |= FLAG_HAS_PROCESS_PMCS; 445 args.pa_required |= (FLAG_HAS_COMMANDLINE | 446 FLAG_HAS_PID); 447 } 448 449 if (option == 'P' || option == 'S') { 450 args.pa_flags |= FLAG_HAS_SAMPLING_PMCS; 451 args.pa_required |= (FLAG_HAS_PIPE | 452 FLAG_HAS_OUTPUT_LOGFILE); 453 } 454 455 if (option == 'p' || option == 's') 456 args.pa_flags |= FLAG_HAS_COUNTING_PMCS; 457 458 if (option == 's' || option == 'S') 459 args.pa_flags |= FLAG_HAS_SYSTEM_PMCS; 460 461 ev->ev_spec = strdup(optarg); 462 463 if (option == 'S' || option == 'P') 464 ev->ev_count = current_sampling_count; 465 else 466 ev->ev_count = -1; 467 468 if (option == 'S' || option == 's') 469 ev->ev_cpu = current_cpu; 470 else 471 ev->ev_cpu = PMC_CPU_ANY; 472 473 ev->ev_flags = 0; 474 if (do_descendants) 475 ev->ev_flags |= PMC_F_DESCENDANTS; 476 if (do_logprocexit) 477 ev->ev_flags |= PMC_F_LOG_PROCEXIT; 478 if (do_logproccsw) 479 ev->ev_flags |= PMC_F_LOG_PROCCSW; 480 481 ev->ev_cumulative = use_cumulative_counts; 482 483 ev->ev_saved = 0LL; 484 ev->ev_pmcid = PMC_ID_INVALID; 485 486 /* extract event name */ 487 c = strcspn(optarg, ", \t"); 488 ev->ev_name = malloc(c + 1); 489 (void) strncpy(ev->ev_name, optarg, c); 490 *(ev->ev_name + c) = '\0'; 491 492 STAILQ_INSERT_TAIL(&args.pa_head, ev, ev_next); 493 494 break; 495 496 case 'n': /* sampling count */ 497 current_sampling_count = strtol(optarg, &end, 0); 498 if (*end != '\0' || current_sampling_count <= 0) 499 errx(EX_USAGE, 500 "ERROR: Illegal count value \"%s\".", 501 optarg); 502 args.pa_required |= FLAG_HAS_SAMPLING_PMCS; 503 break; 504 505 case 'o': /* outputfile */ 506 if (args.pa_printfile != NULL) 507 (void) fclose(args.pa_printfile); 508 if ((args.pa_printfile = fopen(optarg, "w")) == NULL) 509 errx(EX_OSERR, "ERROR: cannot open \"%s\" for " 510 "writing.", optarg); 511 args.pa_flags |= FLAG_DO_PRINT; 512 break; 513 514 case 'O': /* sampling output */ 515 if (args.pa_outputpath) 516 errx(EX_USAGE, "ERROR: option -O may only be " 517 "specified once."); 518 args.pa_outputpath = optarg; 519 args.pa_flags |= FLAG_HAS_OUTPUT_LOGFILE; 520 break; 521 522 case 'R': /* read an existing log file */ 523 if (args.pa_logparser != NULL) 524 errx(EX_USAGE, "ERROR: option -R may only be " 525 "specified once."); 526 args.pa_inputpath = optarg; 527 if (args.pa_printfile == stderr) 528 args.pa_printfile = stdout; 529 args.pa_flags |= FLAG_READ_LOGFILE; 530 break; 531 532 case 't': /* target pid */ 533 pid = strtol(optarg, &end, 0); 534 if (*end != '\0' || pid <= 0) 535 errx(EX_USAGE, "ERROR: Illegal pid value " 536 "\"%s\".", optarg); 537 538 args.pa_flags |= FLAG_HAS_PID; 539 args.pa_required |= FLAG_HAS_PROCESS_PMCS; 540 args.pa_pid = pid; 541 break; 542 543 case 'w': /* wait interval */ 544 interval = strtod(optarg, &end); 545 if (*end != '\0' || interval <= 0) 546 errx(EX_USAGE, "ERROR: Illegal wait interval " 547 "value \"%s\".", optarg); 548 args.pa_flags |= FLAG_HAS_WAIT_INTERVAL; 549 args.pa_required |= FLAG_HAS_COUNTING_PMCS; 550 args.pa_interval = interval; 551 break; 552 553 case 'W': /* toggle LOG_CSW */ 554 do_logproccsw = !do_logproccsw; 555 args.pa_required |= (FLAG_HAS_PROCESS_PMCS | 556 FLAG_HAS_COUNTING_PMCS | FLAG_HAS_OUTPUT_LOGFILE); 557 break; 558 559 case '?': 560 default: 561 pmcstat_show_usage(); 562 break; 563 564 } 565 566 args.pa_argc = (argc -= optind); 567 args.pa_argv = (argv += optind); 568 569 if (argc) /* command line present */ 570 args.pa_flags |= FLAG_HAS_COMMANDLINE; 571 572 /* 573 * Check invocation syntax. 574 */ 575 576 /* disallow -O and -R together */ 577 if (args.pa_outputpath && args.pa_inputpath) 578 errx(EX_USAGE, "ERROR: options -O and -R are mutually " 579 "exclusive."); 580 581 if (args.pa_flags & FLAG_READ_LOGFILE) { 582 errmsg = NULL; 583 if (args.pa_flags & FLAG_HAS_COMMANDLINE) 584 errmsg = "a command line specification"; 585 else if (args.pa_flags & FLAG_HAS_PID) 586 errmsg = "option -t"; 587 else if (!STAILQ_EMPTY(&args.pa_head)) 588 errmsg = "a PMC event specification"; 589 if (errmsg) 590 errx(EX_USAGE, "ERROR: option -R may not be used with " 591 "%s.", errmsg); 592 } else if (STAILQ_EMPTY(&args.pa_head)) 593 /* All other uses require a PMC spec. */ 594 pmcstat_show_usage(); 595 596 /* check for -t pid without a process PMC spec */ 597 if ((args.pa_required & FLAG_HAS_PID) && 598 (args.pa_flags & FLAG_HAS_PROCESS_PMCS) == 0) 599 errx(EX_USAGE, "ERROR: option -t requires a process mode PMC " 600 "to be specified."); 601 602 /* check for process-mode options without a command or -t pid */ 603 if ((args.pa_required & FLAG_HAS_PROCESS_PMCS) && 604 (args.pa_flags & (FLAG_HAS_COMMANDLINE | FLAG_HAS_PID)) == 0) 605 errx(EX_USAGE, "ERROR: options -d, -E, -p, -P, and -W require " 606 "a command line or target process."); 607 608 /* check for -p | -P without a target process of some sort */ 609 if ((args.pa_required & (FLAG_HAS_COMMANDLINE | FLAG_HAS_PID)) && 610 (args.pa_flags & (FLAG_HAS_COMMANDLINE | FLAG_HAS_PID)) == 0) 611 errx(EX_USAGE, "ERROR: options -P and -p require a " 612 "target process or a command line."); 613 614 /* check for process-mode options without a process-mode PMC */ 615 if ((args.pa_required & FLAG_HAS_PROCESS_PMCS) && 616 (args.pa_flags & FLAG_HAS_PROCESS_PMCS) == 0) 617 errx(EX_USAGE, "ERROR: options -d, -E, and -W require a " 618 "process mode PMC to be specified."); 619 620 /* check for -c cpu and not system mode PMCs */ 621 if ((args.pa_required & FLAG_HAS_SYSTEM_PMCS) && 622 (args.pa_flags & FLAG_HAS_SYSTEM_PMCS) == 0) 623 errx(EX_USAGE, "ERROR: option -c requires at least one " 624 "system mode PMC to be specified."); 625 626 /* check for counting mode options without a counting PMC */ 627 if ((args.pa_required & FLAG_HAS_COUNTING_PMCS) && 628 (args.pa_flags & FLAG_HAS_COUNTING_PMCS) == 0) 629 errx(EX_USAGE, "ERROR: options -C, -o and -W require at least " 630 "one counting mode PMC to be specified."); 631 632 /* check for sampling mode options without a sampling PMC spec */ 633 if ((args.pa_required & FLAG_HAS_SAMPLING_PMCS) && 634 (args.pa_flags & FLAG_HAS_SAMPLING_PMCS) == 0) 635 errx(EX_USAGE, "ERROR: options -n and -O require at least " 636 "one sampling mode PMC to be specified."); 637 638 if ((args.pa_flags & (FLAG_HAS_PID | FLAG_HAS_COMMANDLINE)) == 639 (FLAG_HAS_PID | FLAG_HAS_COMMANDLINE)) 640 errx(EX_USAGE, 641 "ERROR: option -t cannot be specified with a command " 642 "line."); 643 644 /* check if -g is being used correctly */ 645 if ((args.pa_flags & FLAG_DO_GPROF) && 646 !(args.pa_flags & (FLAG_HAS_SAMPLING_PMCS|FLAG_READ_LOGFILE))) 647 errx(EX_USAGE, "ERROR: option -g requires sampling PMCs or -R " 648 "to be specified."); 649 650 /* check if -O was spuriously specified */ 651 if ((args.pa_flags & FLAG_HAS_OUTPUT_LOGFILE) && 652 (args.pa_required & FLAG_HAS_OUTPUT_LOGFILE) == 0) 653 errx(EX_USAGE, 654 "ERROR: option -O is used only with options " 655 "-E, -P, -S and -W."); 656 657 /* -D dir and -k kernel path require -g */ 658 if ((args.pa_flags & FLAG_HAS_KERNELPATH) && 659 ((args.pa_flags & FLAG_DO_GPROF) == 0)) 660 errx(EX_USAGE, "ERROR: option -k is only used with -g."); 661 662 if ((args.pa_flags & FLAG_HAS_SAMPLESDIR) && 663 ((args.pa_flags & FLAG_DO_GPROF) == 0)) 664 errx(EX_USAGE, "ERROR: option -D is only used with -g."); 665 666 /* 667 * Disallow textual output of sampling PMCs if counting PMCs 668 * have also been asked for, mostly because the combined output 669 * is difficult to make sense of. 670 */ 671 if ((args.pa_flags & FLAG_HAS_COUNTING_PMCS) && 672 (args.pa_flags & FLAG_HAS_SAMPLING_PMCS) && 673 ((args.pa_required & FLAG_HAS_OUTPUT_LOGFILE) == 0)) 674 errx(EX_USAGE, "ERROR: option -O is required if counting and " 675 "sampling PMCs are specified together."); 676 677 /* if we've been asked to process a log file, do that and exit */ 678 if (args.pa_flags & FLAG_READ_LOGFILE) { 679 /* 680 * Print the log in textual form if we haven't been 681 * asked to generate gmon.out files. 682 */ 683 if ((args.pa_flags & FLAG_DO_GPROF) == 0) 684 args.pa_flags |= FLAG_DO_PRINT; 685 686 pmcstat_initialize_logging(&args); 687 if ((args.pa_logfd = pmcstat_open(args.pa_inputpath, 688 PMCSTAT_OPEN_FOR_READ)) < 0) 689 err(EX_OSERR, "ERROR: Cannot open \"%s\" for " 690 "reading", args.pa_inputpath); 691 if ((args.pa_logparser = pmclog_open(args.pa_logfd)) == NULL) 692 err(EX_OSERR, "ERROR: Cannot create parser"); 693 pmcstat_process_log(&args); 694 exit(EX_OK); 695 } 696 697 /* otherwise, we've been asked to collect data */ 698 if (pmc_init() < 0) 699 err(EX_UNAVAILABLE, 700 "ERROR: Initialization of the pmc(3) library failed"); 701 702 if ((ncpu = pmc_ncpu()) < 0) 703 err(EX_OSERR, "ERROR: Cannot determine the number CPUs " 704 "on the system"); 705 706 if ((npmc = pmc_npmc(0)) < 0) /* assume all CPUs are identical */ 707 err(EX_OSERR, "ERROR: Cannot determine the number of PMCs " 708 "on CPU %d", 0); 709 710 /* Allocate a kqueue */ 711 if ((pmcstat_kq = kqueue()) < 0) 712 err(EX_OSERR, "ERROR: Cannot allocate kqueue"); 713 714 /* 715 * Configure the specified log file or setup a default log 716 * consumer via a pipe. 717 */ 718 if (args.pa_required & FLAG_HAS_OUTPUT_LOGFILE) { 719 if (args.pa_outputpath) { 720 if ((args.pa_logfd = pmcstat_open(args.pa_outputpath, 721 PMCSTAT_OPEN_FOR_WRITE)) < 0) 722 err(EX_OSERR, "ERROR: Cannot open \"%s\" for " 723 "writing", args.pa_outputpath); 724 } else { 725 /* 726 * process the log on the fly by reading it in 727 * through a pipe. 728 */ 729 if (pipe(pipefd) < 0) 730 err(EX_OSERR, "ERROR: pipe(2) failed"); 731 732 if (fcntl(pipefd[READPIPEFD], F_SETFL, O_NONBLOCK) < 0) 733 err(EX_OSERR, "ERROR: fcntl(2) failed"); 734 735 EV_SET(&kev, pipefd[READPIPEFD], EVFILT_READ, EV_ADD, 736 0, 0, NULL); 737 738 if (kevent(pmcstat_kq, &kev, 1, NULL, 0, NULL) < 0) 739 err(EX_OSERR, "ERROR: Cannot register kevent"); 740 741 args.pa_logfd = pipefd[WRITEPIPEFD]; 742 743 args.pa_flags |= (FLAG_HAS_PIPE | FLAG_DO_PRINT); 744 args.pa_logparser = pmclog_open(pipefd[READPIPEFD]); 745 } 746 747 if (pmc_configure_logfile(args.pa_logfd) < 0) 748 err(EX_OSERR, "ERROR: Cannot configure log file"); 749 } 750 751 /* 752 * Allocate PMCs. 753 */ 754 755 STAILQ_FOREACH(ev, &args.pa_head, ev_next) { 756 if (pmc_allocate(ev->ev_spec, ev->ev_mode, 757 ev->ev_flags, ev->ev_cpu, &ev->ev_pmcid) < 0) 758 err(EX_OSERR, "ERROR: Cannot allocate %s-mode pmc with " 759 "specification \"%s\"", 760 PMC_IS_SYSTEM_MODE(ev->ev_mode) ? "system" : "process", 761 ev->ev_spec); 762 763 if (PMC_IS_SAMPLING_MODE(ev->ev_mode) && 764 pmc_set(ev->ev_pmcid, ev->ev_count) < 0) 765 err(EX_OSERR, "ERROR: Cannot set sampling count " 766 "for PMC \"%s\"", ev->ev_name); 767 } 768 769 /* compute printout widths */ 770 STAILQ_FOREACH(ev, &args.pa_head, ev_next) { 771 int counter_width; 772 int display_width; 773 int header_width; 774 775 (void) pmc_width(ev->ev_pmcid, &counter_width); 776 header_width = strlen(ev->ev_name) + 2; /* prefix '%c|' */ 777 display_width = (int) floor(counter_width / 3.32193) + 1; 778 779 if (header_width > display_width) { 780 ev->ev_fieldskip = 0; 781 ev->ev_fieldwidth = header_width; 782 } else { 783 ev->ev_fieldskip = display_width - 784 header_width; 785 ev->ev_fieldwidth = display_width; 786 } 787 } 788 789 /* 790 * If our output is being set to a terminal, register a handler 791 * for window size changes. 792 */ 793 794 if (isatty(fileno(args.pa_printfile))) { 795 796 if (ioctl(fileno(args.pa_printfile), TIOCGWINSZ, &ws) < 0) 797 err(EX_OSERR, "ERROR: Cannot determine window size"); 798 799 pmcstat_displayheight = ws.ws_row - 1; 800 801 EV_SET(&kev, SIGWINCH, EVFILT_SIGNAL, EV_ADD, 0, 0, NULL); 802 803 if (kevent(pmcstat_kq, &kev, 1, NULL, 0, NULL) < 0) 804 err(EX_OSERR, "ERROR: Cannot register kevent for " 805 "SIGWINCH"); 806 } 807 808 EV_SET(&kev, SIGINT, EVFILT_SIGNAL, EV_ADD, 0, 0, NULL); 809 if (kevent(pmcstat_kq, &kev, 1, NULL, 0, NULL) < 0) 810 err(EX_OSERR, "ERROR: Cannot register kevent for SIGINT"); 811 812 EV_SET(&kev, SIGIO, EVFILT_SIGNAL, EV_ADD, 0, 0, NULL); 813 if (kevent(pmcstat_kq, &kev, 1, NULL, 0, NULL) < 0) 814 err(EX_OSERR, "ERROR: Cannot register kevent for SIGIO"); 815 816 /* 817 * An exec() failure of a forked child is signalled by the 818 * child sending the parent a SIGCHLD. We don't register an 819 * actual signal handler for SIGCHLD, but instead use our 820 * kqueue to pick up the signal. 821 */ 822 EV_SET(&kev, SIGCHLD, EVFILT_SIGNAL, EV_ADD, 0, 0, NULL); 823 if (kevent(pmcstat_kq, &kev, 1, NULL, 0, NULL) < 0) 824 err(EX_OSERR, "ERROR: Cannot register kevent for SIGCHLD"); 825 826 /* setup a timer if we have counting mode PMCs needing to be printed */ 827 if ((args.pa_flags & FLAG_HAS_COUNTING_PMCS) && 828 (args.pa_required & FLAG_HAS_OUTPUT_LOGFILE) == 0) { 829 EV_SET(&kev, 0, EVFILT_TIMER, EV_ADD, 0, 830 args.pa_interval * 1000, NULL); 831 832 if (kevent(pmcstat_kq, &kev, 1, NULL, 0, NULL) < 0) 833 err(EX_OSERR, "ERROR: Cannot register kevent for " 834 "timer"); 835 } 836 837 /* attach PMCs to the target process, starting it if specified */ 838 if (args.pa_flags & (FLAG_HAS_PID | FLAG_HAS_COMMANDLINE)) 839 pmcstat_setup_process(&args); 840 841 /* start the pmcs */ 842 pmcstat_start_pmcs(&args); 843 844 /* start the (commandline) process if needed */ 845 if (args.pa_flags & FLAG_HAS_COMMANDLINE) 846 pmcstat_start_process(&args); 847 848 /* initialize logging if printing the configured log */ 849 if ((args.pa_flags & FLAG_DO_PRINT) && 850 (args.pa_flags & (FLAG_HAS_PIPE | FLAG_HAS_OUTPUT_LOGFILE))) 851 pmcstat_initialize_logging(&args); 852 853 /* Handle SIGINT using the kqueue loop */ 854 sa.sa_handler = SIG_IGN; 855 sa.sa_flags = 0; 856 (void) sigemptyset(&sa.sa_mask); 857 858 if (sigaction(SIGINT, &sa, NULL) < 0) 859 err(EX_OSERR, "ERROR: Cannot install signal handler"); 860 861 /* 862 * loop till either the target process (if any) exits, or we 863 * are killed by a SIGINT. 864 */ 865 runstate = PMCSTAT_RUNNING; 866 do_print = 0; 867 do { 868 if ((c = kevent(pmcstat_kq, NULL, 0, &kev, 1, NULL)) <= 0) { 869 if (errno != EINTR) 870 err(EX_OSERR, "ERROR: kevent failed"); 871 else 872 continue; 873 } 874 875 if (kev.flags & EV_ERROR) 876 errc(EX_OSERR, kev.data, "ERROR: kevent failed"); 877 878 switch (kev.filter) { 879 case EVFILT_PROC: /* target has exited */ 880 if (args.pa_flags & (FLAG_HAS_OUTPUT_LOGFILE | 881 FLAG_HAS_PIPE)) 882 runstate = pmcstat_close_log(&args); 883 break; 884 885 case EVFILT_READ: /* log file data is present */ 886 runstate = pmcstat_process_log(&args); 887 break; 888 889 case EVFILT_SIGNAL: 890 if (kev.ident == SIGCHLD) { 891 /* 892 * The child process sends us a 893 * SIGCHLD if its exec() failed. We 894 * wait for it to exit and then exit 895 * ourselves. 896 */ 897 (void) wait(&c); 898 runstate = PMCSTAT_FINISHED; 899 } else if (kev.ident == SIGIO) { 900 /* 901 * We get a SIGIO if a PMC loses all 902 * of its targets, or if logfile 903 * writes encounter an error. 904 */ 905 if (args.pa_flags & (FLAG_HAS_OUTPUT_LOGFILE | 906 FLAG_HAS_PIPE)) { 907 runstate = pmcstat_close_log(&args); 908 if (args.pa_flags & 909 (FLAG_DO_PRINT|FLAG_DO_GPROF)) 910 pmcstat_process_log(&args); 911 } 912 do_print = 1; /* print PMCs at exit */ 913 runstate = PMCSTAT_FINISHED; 914 } else if (kev.ident == SIGINT) { 915 /* Kill the child process if we started it */ 916 if (args.pa_flags & FLAG_HAS_COMMANDLINE) 917 if (kill(args.pa_pid, SIGINT) != 0) 918 err(EX_OSERR, "ERROR: cannot " 919 "signal child process"); 920 runstate = PMCSTAT_FINISHED; 921 } else if (kev.ident == SIGWINCH) { 922 if (ioctl(fileno(args.pa_printfile), 923 TIOCGWINSZ, &ws) < 0) 924 err(EX_OSERR, "ERROR: Cannot determine " 925 "window size"); 926 pmcstat_displayheight = ws.ws_row - 1; 927 } else 928 assert(0); 929 930 break; 931 932 case EVFILT_TIMER: /* print out counting PMCs */ 933 do_print = 1; 934 break; 935 936 } 937 938 if (do_print && 939 (args.pa_required & FLAG_HAS_OUTPUT_LOGFILE) == 0) { 940 pmcstat_print_pmcs(&args); 941 if (runstate == PMCSTAT_FINISHED && /* final newline */ 942 (args.pa_flags & FLAG_DO_PRINT) == 0) 943 (void) fprintf(args.pa_printfile, "\n"); 944 do_print = 0; 945 } 946 947 } while (runstate != PMCSTAT_FINISHED); 948 949 /* flush any pending log entries */ 950 if (args.pa_flags & (FLAG_HAS_OUTPUT_LOGFILE | FLAG_HAS_PIPE)) 951 pmc_flush_logfile(); 952 953 pmcstat_cleanup(&args); 954 955 return 0; 956 } 957