1 /*- 2 * Copyright (c) 2003-2007, Joseph Koshy 3 * Copyright (c) 2007 The FreeBSD Foundation 4 * All rights reserved. 5 * 6 * Portions of this software were developed by A. Joseph Koshy under 7 * sponsorship from the FreeBSD Foundation and Google, Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include <sys/types.h> 35 #include <sys/event.h> 36 #include <sys/param.h> 37 #include <sys/queue.h> 38 #include <sys/socket.h> 39 #include <sys/stat.h> 40 #include <sys/sysctl.h> 41 #include <sys/time.h> 42 #include <sys/ttycom.h> 43 #include <sys/user.h> 44 #include <sys/wait.h> 45 46 #include <assert.h> 47 #include <err.h> 48 #include <errno.h> 49 #include <fcntl.h> 50 #include <kvm.h> 51 #include <libgen.h> 52 #include <limits.h> 53 #include <math.h> 54 #include <pmc.h> 55 #include <pmclog.h> 56 #include <regex.h> 57 #include <signal.h> 58 #include <stdarg.h> 59 #include <stdint.h> 60 #include <stdio.h> 61 #include <stdlib.h> 62 #include <string.h> 63 #include <sysexits.h> 64 #include <unistd.h> 65 66 #include "pmcstat.h" 67 68 /* 69 * A given invocation of pmcstat(8) can manage multiple PMCs of both 70 * the system-wide and per-process variety. Each of these could be in 71 * 'counting mode' or in 'sampling mode'. 72 * 73 * For 'counting mode' PMCs, pmcstat(8) will periodically issue a 74 * pmc_read() at the configured time interval and print out the value 75 * of the requested PMCs. 76 * 77 * For 'sampling mode' PMCs it can log to a file for offline analysis, 78 * or can analyse sampling data "on the fly", either by converting 79 * samples to printed textual form or by creating gprof(1) compatible 80 * profiles, one per program executed. When creating gprof(1) 81 * profiles it can optionally merge entries from multiple processes 82 * for a given executable into a single profile file. 83 * 84 * pmcstat(8) can also execute a command line and attach PMCs to the 85 * resulting child process. The protocol used is as follows: 86 * 87 * - parent creates a socketpair for two way communication and 88 * fork()s. 89 * - subsequently: 90 * 91 * /Parent/ /Child/ 92 * 93 * - Wait for childs token. 94 * - Sends token. 95 * - Awaits signal to start. 96 * - Attaches PMCs to the child's pid 97 * and starts them. Sets up 98 * monitoring for the child. 99 * - Signals child to start. 100 * - Recieves signal, attempts exec(). 101 * 102 * After this point normal processing can happen. 103 */ 104 105 /* Globals */ 106 107 int pmcstat_interrupt = 0; 108 int pmcstat_displayheight = DEFAULT_DISPLAY_HEIGHT; 109 int pmcstat_sockpair[NSOCKPAIRFD]; 110 int pmcstat_kq; 111 kvm_t *pmcstat_kvm; 112 struct kinfo_proc *pmcstat_plist; 113 114 void 115 pmcstat_attach_pmcs(struct pmcstat_args *a) 116 { 117 struct pmcstat_ev *ev; 118 struct pmcstat_target *pt; 119 int count; 120 121 /* Attach all process PMCs to target processes. */ 122 count = 0; 123 STAILQ_FOREACH(ev, &a->pa_events, ev_next) { 124 if (PMC_IS_SYSTEM_MODE(ev->ev_mode)) 125 continue; 126 SLIST_FOREACH(pt, &a->pa_targets, pt_next) 127 if (pmc_attach(ev->ev_pmcid, pt->pt_pid) == 0) 128 count++; 129 else if (errno != ESRCH) 130 err(EX_OSERR, "ERROR: cannot attach pmc " 131 "\"%s\" to process %d", ev->ev_name, 132 (int) pt->pt_pid); 133 } 134 135 if (count == 0) 136 errx(EX_DATAERR, "ERROR: No processes were attached to."); 137 } 138 139 140 void 141 pmcstat_cleanup(struct pmcstat_args *a) 142 { 143 struct pmcstat_ev *ev, *tmp; 144 145 /* release allocated PMCs. */ 146 STAILQ_FOREACH_SAFE(ev, &a->pa_events, ev_next, tmp) 147 if (ev->ev_pmcid != PMC_ID_INVALID) { 148 if (pmc_release(ev->ev_pmcid) < 0) 149 err(EX_OSERR, "ERROR: cannot release pmc " 150 "0x%x \"%s\"", ev->ev_pmcid, ev->ev_name); 151 free(ev->ev_name); 152 free(ev->ev_spec); 153 STAILQ_REMOVE(&a->pa_events, ev, pmcstat_ev, ev_next); 154 free(ev); 155 } 156 157 /* de-configure the log file if present. */ 158 if (a->pa_flags & (FLAG_HAS_PIPE | FLAG_HAS_OUTPUT_LOGFILE)) 159 (void) pmc_configure_logfile(-1); 160 161 if (a->pa_logparser) { 162 pmclog_close(a->pa_logparser); 163 a->pa_logparser = NULL; 164 } 165 166 if (a->pa_flags & (FLAG_HAS_PIPE | FLAG_HAS_OUTPUT_LOGFILE)) 167 pmcstat_shutdown_logging(a); 168 } 169 170 void 171 pmcstat_clone_event_descriptor(struct pmcstat_args *a, struct pmcstat_ev *ev, 172 uint32_t cpumask) 173 { 174 int cpu; 175 struct pmcstat_ev *ev_clone; 176 177 while ((cpu = ffs(cpumask)) > 0) { 178 cpu--; 179 180 if ((ev_clone = malloc(sizeof(*ev_clone))) == NULL) 181 errx(EX_SOFTWARE, "ERROR: Out of memory"); 182 (void) memset(ev_clone, 0, sizeof(*ev_clone)); 183 184 ev_clone->ev_count = ev->ev_count; 185 ev_clone->ev_cpu = cpu; 186 ev_clone->ev_cumulative = ev->ev_cumulative; 187 ev_clone->ev_flags = ev->ev_flags; 188 ev_clone->ev_mode = ev->ev_mode; 189 ev_clone->ev_name = strdup(ev->ev_name); 190 ev_clone->ev_pmcid = ev->ev_pmcid; 191 ev_clone->ev_saved = ev->ev_saved; 192 ev_clone->ev_spec = strdup(ev->ev_spec); 193 194 STAILQ_INSERT_TAIL(&a->pa_events, ev_clone, ev_next); 195 196 cpumask &= ~(1 << cpu); 197 } 198 } 199 200 void 201 pmcstat_create_process(struct pmcstat_args *a) 202 { 203 char token; 204 pid_t pid; 205 struct kevent kev; 206 struct pmcstat_target *pt; 207 208 if (socketpair(AF_UNIX, SOCK_STREAM, 0, pmcstat_sockpair) < 0) 209 err(EX_OSERR, "ERROR: cannot create socket pair"); 210 211 switch (pid = fork()) { 212 case -1: 213 err(EX_OSERR, "ERROR: cannot fork"); 214 /*NOTREACHED*/ 215 216 case 0: /* child */ 217 (void) close(pmcstat_sockpair[PARENTSOCKET]); 218 219 /* Write a token to tell our parent we've started executing. */ 220 if (write(pmcstat_sockpair[CHILDSOCKET], "+", 1) != 1) 221 err(EX_OSERR, "ERROR (child): cannot write token"); 222 223 /* Wait for our parent to signal us to start. */ 224 if (read(pmcstat_sockpair[CHILDSOCKET], &token, 1) < 0) 225 err(EX_OSERR, "ERROR (child): cannot read token"); 226 (void) close(pmcstat_sockpair[CHILDSOCKET]); 227 228 /* exec() the program requested */ 229 execvp(*a->pa_argv, a->pa_argv); 230 /* and if that fails, notify the parent */ 231 kill(getppid(), SIGCHLD); 232 err(EX_OSERR, "ERROR: execvp \"%s\" failed", *a->pa_argv); 233 /*NOTREACHED*/ 234 235 default: /* parent */ 236 (void) close(pmcstat_sockpair[CHILDSOCKET]); 237 break; 238 } 239 240 /* Ask to be notified via a kevent when the target process exits. */ 241 EV_SET(&kev, pid, EVFILT_PROC, EV_ADD|EV_ONESHOT, NOTE_EXIT, 0, 242 NULL); 243 if (kevent(pmcstat_kq, &kev, 1, NULL, 0, NULL) < 0) 244 err(EX_OSERR, "ERROR: cannot monitor child process %d", pid); 245 246 if ((pt = malloc(sizeof(*pt))) == NULL) 247 errx(EX_SOFTWARE, "ERROR: Out of memory."); 248 249 pt->pt_pid = pid; 250 SLIST_INSERT_HEAD(&a->pa_targets, pt, pt_next); 251 252 /* Wait for the child to signal that its ready to go. */ 253 if (read(pmcstat_sockpair[PARENTSOCKET], &token, 1) < 0) 254 err(EX_OSERR, "ERROR (parent): cannot read token"); 255 256 return; 257 } 258 259 void 260 pmcstat_find_targets(struct pmcstat_args *a, const char *spec) 261 { 262 int n, nproc, pid, rv; 263 struct pmcstat_target *pt; 264 char errbuf[_POSIX2_LINE_MAX], *end; 265 static struct kinfo_proc *kp; 266 regex_t reg; 267 regmatch_t regmatch; 268 269 /* First check if we've been given a process id. */ 270 pid = strtol(spec, &end, 0); 271 if (end != spec && pid >= 0) { 272 if ((pt = malloc(sizeof(*pt))) == NULL) 273 goto outofmemory; 274 pt->pt_pid = pid; 275 SLIST_INSERT_HEAD(&a->pa_targets, pt, pt_next); 276 return; 277 } 278 279 /* Otherwise treat arg as a regular expression naming processes. */ 280 if (pmcstat_kvm == NULL) { 281 if ((pmcstat_kvm = kvm_openfiles(NULL, "/dev/null", NULL, 0, 282 errbuf)) == NULL) 283 err(EX_OSERR, "ERROR: Cannot open kernel \"%s\"", 284 errbuf); 285 if ((pmcstat_plist = kvm_getprocs(pmcstat_kvm, KERN_PROC_PROC, 286 0, &nproc)) == NULL) 287 err(EX_OSERR, "ERROR: Cannot get process list: %s", 288 kvm_geterr(pmcstat_kvm)); 289 } 290 291 if ((rv = regcomp(®, spec, REG_EXTENDED|REG_NOSUB)) != 0) { 292 regerror(rv, ®, errbuf, sizeof(errbuf)); 293 err(EX_DATAERR, "ERROR: Failed to compile regex \"%s\": %s", 294 spec, errbuf); 295 } 296 297 for (n = 0, kp = pmcstat_plist; n < nproc; n++, kp++) { 298 if ((rv = regexec(®, kp->ki_comm, 1, ®match, 0)) == 0) { 299 if ((pt = malloc(sizeof(*pt))) == NULL) 300 goto outofmemory; 301 pt->pt_pid = kp->ki_pid; 302 SLIST_INSERT_HEAD(&a->pa_targets, pt, pt_next); 303 } else if (rv != REG_NOMATCH) { 304 regerror(rv, ®, errbuf, sizeof(errbuf)); 305 errx(EX_SOFTWARE, "ERROR: Regex evalation failed: %s", 306 errbuf); 307 } 308 } 309 310 regfree(®); 311 312 return; 313 314 outofmemory: 315 errx(EX_SOFTWARE, "Out of memory."); 316 /*NOTREACHED*/ 317 } 318 319 uint32_t 320 pmcstat_get_cpumask(const char *cpuspec) 321 { 322 uint32_t cpumask; 323 int cpu; 324 const char *s; 325 char *end; 326 327 s = cpuspec; 328 cpumask = 0ULL; 329 330 do { 331 cpu = strtol(s, &end, 0); 332 if (cpu < 0 || end == s) 333 errx(EX_USAGE, "ERROR: Illegal CPU specification " 334 "\"%s\".", cpuspec); 335 cpumask |= (1 << cpu); 336 s = end + strspn(end, ", \t"); 337 } while (*s); 338 339 return (cpumask); 340 } 341 342 void 343 pmcstat_kill_process(struct pmcstat_args *a) 344 { 345 struct pmcstat_target *pt; 346 347 assert(a->pa_flags & FLAG_HAS_COMMANDLINE); 348 349 /* 350 * If a command line was specified, it would be the very first 351 * in the list, before any other processes specified by -t. 352 */ 353 pt = SLIST_FIRST(&a->pa_targets); 354 assert(pt != NULL); 355 356 if (kill(pt->pt_pid, SIGINT) != 0) 357 err(EX_OSERR, "ERROR: cannot signal child process"); 358 } 359 360 void 361 pmcstat_start_pmcs(struct pmcstat_args *a) 362 { 363 struct pmcstat_ev *ev; 364 365 STAILQ_FOREACH(ev, &args.pa_events, ev_next) { 366 367 assert(ev->ev_pmcid != PMC_ID_INVALID); 368 369 if (pmc_start(ev->ev_pmcid) < 0) { 370 warn("ERROR: Cannot start pmc 0x%x \"%s\"", 371 ev->ev_pmcid, ev->ev_name); 372 pmcstat_cleanup(a); 373 exit(EX_OSERR); 374 } 375 } 376 377 } 378 379 void 380 pmcstat_print_headers(struct pmcstat_args *a) 381 { 382 struct pmcstat_ev *ev; 383 int c, w; 384 385 (void) fprintf(a->pa_printfile, PRINT_HEADER_PREFIX); 386 387 STAILQ_FOREACH(ev, &a->pa_events, ev_next) { 388 if (PMC_IS_SAMPLING_MODE(ev->ev_mode)) 389 continue; 390 391 c = PMC_IS_SYSTEM_MODE(ev->ev_mode) ? 's' : 'p'; 392 393 if (ev->ev_fieldskip != 0) 394 (void) fprintf(a->pa_printfile, "%*s", 395 ev->ev_fieldskip, ""); 396 w = ev->ev_fieldwidth - ev->ev_fieldskip - 2; 397 398 if (c == 's') 399 (void) fprintf(a->pa_printfile, "s/%02d/%-*s ", 400 ev->ev_cpu, w-3, ev->ev_name); 401 else 402 (void) fprintf(a->pa_printfile, "p/%*s ", w, 403 ev->ev_name); 404 } 405 406 (void) fflush(a->pa_printfile); 407 } 408 409 void 410 pmcstat_print_counters(struct pmcstat_args *a) 411 { 412 int extra_width; 413 struct pmcstat_ev *ev; 414 pmc_value_t value; 415 416 extra_width = sizeof(PRINT_HEADER_PREFIX) - 1; 417 418 STAILQ_FOREACH(ev, &a->pa_events, ev_next) { 419 420 /* skip sampling mode counters */ 421 if (PMC_IS_SAMPLING_MODE(ev->ev_mode)) 422 continue; 423 424 if (pmc_read(ev->ev_pmcid, &value) < 0) 425 err(EX_OSERR, "ERROR: Cannot read pmc " 426 "\"%s\"", ev->ev_name); 427 428 (void) fprintf(a->pa_printfile, "%*ju ", 429 ev->ev_fieldwidth + extra_width, 430 (uintmax_t) ev->ev_cumulative ? value : 431 (value - ev->ev_saved)); 432 433 if (ev->ev_cumulative == 0) 434 ev->ev_saved = value; 435 extra_width = 0; 436 } 437 438 (void) fflush(a->pa_printfile); 439 } 440 441 /* 442 * Print output 443 */ 444 445 void 446 pmcstat_print_pmcs(struct pmcstat_args *a) 447 { 448 static int linecount = 0; 449 450 /* check if we need to print a header line */ 451 if (++linecount > pmcstat_displayheight) { 452 (void) fprintf(a->pa_printfile, "\n"); 453 linecount = 1; 454 } 455 if (linecount == 1) 456 pmcstat_print_headers(a); 457 (void) fprintf(a->pa_printfile, "\n"); 458 459 pmcstat_print_counters(a); 460 461 return; 462 } 463 464 /* 465 * Do process profiling 466 * 467 * If a pid was specified, attach each allocated PMC to the target 468 * process. Otherwise, fork a child and attach the PMCs to the child, 469 * and have the child exec() the target program. 470 */ 471 472 void 473 pmcstat_start_process(void) 474 { 475 /* Signal the child to proceed. */ 476 if (write(pmcstat_sockpair[PARENTSOCKET], "!", 1) != 1) 477 err(EX_OSERR, "ERROR (parent): write of token failed"); 478 479 (void) close(pmcstat_sockpair[PARENTSOCKET]); 480 } 481 482 void 483 pmcstat_show_usage(void) 484 { 485 errx(EX_USAGE, 486 "[options] [commandline]\n" 487 "\t Measure process and/or system performance using hardware\n" 488 "\t performance monitoring counters.\n" 489 "\t Options include:\n" 490 "\t -C\t\t (toggle) show cumulative counts\n" 491 "\t -D path\t create profiles in directory \"path\"\n" 492 "\t -E\t\t (toggle) show counts at process exit\n" 493 "\t -G file\t write a system-wide callgraph to \"file\"\n" 494 "\t -M file\t print executable/gmon file map to \"file\"\n" 495 "\t -N\t\t (toggle) capture callchains\n" 496 "\t -O file\t send log output to \"file\"\n" 497 "\t -P spec\t allocate a process-private sampling PMC\n" 498 "\t -R file\t read events from \"file\"\n" 499 "\t -S spec\t allocate a system-wide sampling PMC\n" 500 "\t -W\t\t (toggle) show counts per context switch\n" 501 "\t -c cpu-list\t set cpus for subsequent system-wide PMCs\n" 502 "\t -d\t\t (toggle) track descendants\n" 503 "\t -g\t\t produce gprof(1) compatible profiles\n" 504 "\t -k dir\t\t set the path to the kernel\n" 505 "\t -n rate\t set sampling rate\n" 506 "\t -o file\t send print output to \"file\"\n" 507 "\t -p spec\t allocate a process-private counting PMC\n" 508 "\t -q\t\t suppress verbosity\n" 509 "\t -r fsroot\t specify FS root directory\n" 510 "\t -s spec\t allocate a system-wide counting PMC\n" 511 "\t -t pid\t\t attach to running process with pid \"pid\"\n" 512 "\t -v\t\t increase verbosity\n" 513 "\t -w secs\t set printing time interval\n" 514 "\t -z depth\t limit callchain display depth" 515 ); 516 } 517 518 /* 519 * Main 520 */ 521 522 int 523 main(int argc, char **argv) 524 { 525 double interval; 526 int option, npmc, ncpu, haltedcpus; 527 int c, check_driver_stats, current_cpu, current_sampling_count; 528 int do_callchain, do_descendants, do_logproccsw, do_logprocexit; 529 int do_print; 530 size_t dummy; 531 int graphdepth; 532 int pipefd[2]; 533 int use_cumulative_counts; 534 uint32_t cpumask; 535 char *end, *tmp; 536 const char *errmsg, *graphfilename; 537 enum pmcstat_state runstate; 538 struct pmc_driverstats ds_start, ds_end; 539 struct pmcstat_ev *ev; 540 struct sigaction sa; 541 struct kevent kev; 542 struct winsize ws; 543 struct stat sb; 544 char buffer[PATH_MAX]; 545 546 check_driver_stats = 0; 547 current_cpu = 0; 548 current_sampling_count = DEFAULT_SAMPLE_COUNT; 549 do_callchain = 1; 550 do_descendants = 0; 551 do_logproccsw = 0; 552 do_logprocexit = 0; 553 use_cumulative_counts = 0; 554 graphfilename = "-"; 555 args.pa_required = 0; 556 args.pa_flags = 0; 557 args.pa_verbosity = 1; 558 args.pa_logfd = -1; 559 args.pa_fsroot = ""; 560 args.pa_kernel = strdup("/boot/kernel"); 561 args.pa_samplesdir = "."; 562 args.pa_printfile = stderr; 563 args.pa_graphdepth = DEFAULT_CALLGRAPH_DEPTH; 564 args.pa_graphfile = NULL; 565 args.pa_interval = DEFAULT_WAIT_INTERVAL; 566 args.pa_mapfilename = NULL; 567 args.pa_inputpath = NULL; 568 args.pa_outputpath = NULL; 569 STAILQ_INIT(&args.pa_events); 570 SLIST_INIT(&args.pa_targets); 571 bzero(&ds_start, sizeof(ds_start)); 572 bzero(&ds_end, sizeof(ds_end)); 573 ev = NULL; 574 575 /* 576 * The initial CPU mask specifies all non-halted CPUS in the 577 * system. 578 */ 579 dummy = sizeof(int); 580 if (sysctlbyname("hw.ncpu", &ncpu, &dummy, NULL, 0) < 0) 581 err(EX_OSERR, "ERROR: Cannot determine the number of CPUs"); 582 cpumask = (1 << ncpu) - 1; 583 if (sysctlbyname("machdep.hlt_cpus", &haltedcpus, &dummy, 584 NULL, 0) < 0) 585 err(EX_OSERR, "ERROR: Cannot determine which CPUs are halted"); 586 cpumask &= ~haltedcpus; 587 588 while ((option = getopt(argc, argv, 589 "CD:EG:M:NO:P:R:S:Wc:dgk:n:o:p:qr:s:t:vw:z:")) != -1) 590 switch (option) { 591 case 'C': /* cumulative values */ 592 use_cumulative_counts = !use_cumulative_counts; 593 args.pa_required |= FLAG_HAS_COUNTING_PMCS; 594 break; 595 596 case 'c': /* CPU */ 597 598 if (optarg[0] == '*' && optarg[1] == '\0') 599 cpumask = (1 << ncpu) - 1; 600 else 601 cpumask = pmcstat_get_cpumask(optarg); 602 603 args.pa_required |= FLAG_HAS_SYSTEM_PMCS; 604 break; 605 606 case 'D': 607 if (stat(optarg, &sb) < 0) 608 err(EX_OSERR, "ERROR: Cannot stat \"%s\"", 609 optarg); 610 if (!S_ISDIR(sb.st_mode)) 611 errx(EX_USAGE, "ERROR: \"%s\" is not a " 612 "directory.", optarg); 613 args.pa_samplesdir = optarg; 614 args.pa_flags |= FLAG_HAS_SAMPLESDIR; 615 args.pa_required |= FLAG_DO_GPROF; 616 break; 617 618 case 'd': /* toggle descendents */ 619 do_descendants = !do_descendants; 620 args.pa_required |= FLAG_HAS_PROCESS_PMCS; 621 break; 622 623 case 'G': /* produce a system-wide callgraph */ 624 args.pa_flags |= FLAG_DO_CALLGRAPHS; 625 graphfilename = optarg; 626 break; 627 628 case 'g': /* produce gprof compatible profiles */ 629 args.pa_flags |= FLAG_DO_GPROF; 630 break; 631 632 case 'k': /* pathname to the kernel */ 633 free(args.pa_kernel); 634 args.pa_kernel = strdup(optarg); 635 args.pa_required |= FLAG_DO_ANALYSIS; 636 args.pa_flags |= FLAG_HAS_KERNELPATH; 637 break; 638 639 case 'E': /* log process exit */ 640 do_logprocexit = !do_logprocexit; 641 args.pa_required |= (FLAG_HAS_PROCESS_PMCS | 642 FLAG_HAS_COUNTING_PMCS | FLAG_HAS_OUTPUT_LOGFILE); 643 break; 644 645 case 'M': /* mapfile */ 646 args.pa_mapfilename = optarg; 647 break; 648 649 case 'N': 650 do_callchain = !do_callchain; 651 args.pa_required |= FLAG_HAS_SAMPLING_PMCS; 652 break; 653 654 case 'p': /* process virtual counting PMC */ 655 case 's': /* system-wide counting PMC */ 656 case 'P': /* process virtual sampling PMC */ 657 case 'S': /* system-wide sampling PMC */ 658 if ((ev = malloc(sizeof(*ev))) == NULL) 659 errx(EX_SOFTWARE, "ERROR: Out of memory."); 660 661 switch (option) { 662 case 'p': ev->ev_mode = PMC_MODE_TC; break; 663 case 's': ev->ev_mode = PMC_MODE_SC; break; 664 case 'P': ev->ev_mode = PMC_MODE_TS; break; 665 case 'S': ev->ev_mode = PMC_MODE_SS; break; 666 } 667 668 if (option == 'P' || option == 'p') { 669 args.pa_flags |= FLAG_HAS_PROCESS_PMCS; 670 args.pa_required |= (FLAG_HAS_COMMANDLINE | 671 FLAG_HAS_TARGET); 672 } 673 674 if (option == 'P' || option == 'S') { 675 args.pa_flags |= FLAG_HAS_SAMPLING_PMCS; 676 args.pa_required |= (FLAG_HAS_PIPE | 677 FLAG_HAS_OUTPUT_LOGFILE); 678 } 679 680 if (option == 'p' || option == 's') 681 args.pa_flags |= FLAG_HAS_COUNTING_PMCS; 682 683 if (option == 's' || option == 'S') 684 args.pa_flags |= FLAG_HAS_SYSTEM_PMCS; 685 686 ev->ev_spec = strdup(optarg); 687 688 if (option == 'S' || option == 'P') 689 ev->ev_count = current_sampling_count; 690 else 691 ev->ev_count = -1; 692 693 if (option == 'S' || option == 's') 694 ev->ev_cpu = ffs(cpumask) - 1; 695 else 696 ev->ev_cpu = PMC_CPU_ANY; 697 698 ev->ev_flags = 0; 699 if (do_callchain) 700 ev->ev_flags |= PMC_F_CALLCHAIN; 701 if (do_descendants) 702 ev->ev_flags |= PMC_F_DESCENDANTS; 703 if (do_logprocexit) 704 ev->ev_flags |= PMC_F_LOG_PROCEXIT; 705 if (do_logproccsw) 706 ev->ev_flags |= PMC_F_LOG_PROCCSW; 707 708 ev->ev_cumulative = use_cumulative_counts; 709 710 ev->ev_saved = 0LL; 711 ev->ev_pmcid = PMC_ID_INVALID; 712 713 /* extract event name */ 714 c = strcspn(optarg, ", \t"); 715 ev->ev_name = malloc(c + 1); 716 (void) strncpy(ev->ev_name, optarg, c); 717 *(ev->ev_name + c) = '\0'; 718 719 STAILQ_INSERT_TAIL(&args.pa_events, ev, ev_next); 720 721 if (option == 's' || option == 'S') 722 pmcstat_clone_event_descriptor(&args, ev, 723 cpumask & ~(1 << ev->ev_cpu)); 724 725 break; 726 727 case 'n': /* sampling count */ 728 current_sampling_count = strtol(optarg, &end, 0); 729 if (*end != '\0' || current_sampling_count <= 0) 730 errx(EX_USAGE, 731 "ERROR: Illegal count value \"%s\".", 732 optarg); 733 args.pa_required |= FLAG_HAS_SAMPLING_PMCS; 734 break; 735 736 case 'o': /* outputfile */ 737 if (args.pa_printfile != NULL) 738 (void) fclose(args.pa_printfile); 739 if ((args.pa_printfile = fopen(optarg, "w")) == NULL) 740 errx(EX_OSERR, "ERROR: cannot open \"%s\" for " 741 "writing.", optarg); 742 args.pa_flags |= FLAG_DO_PRINT; 743 break; 744 745 case 'O': /* sampling output */ 746 if (args.pa_outputpath) 747 errx(EX_USAGE, "ERROR: option -O may only be " 748 "specified once."); 749 args.pa_outputpath = optarg; 750 args.pa_flags |= FLAG_HAS_OUTPUT_LOGFILE; 751 break; 752 753 case 'q': /* quiet mode */ 754 args.pa_verbosity = 0; 755 break; 756 757 case 'r': /* root FS path */ 758 args.pa_fsroot = optarg; 759 break; 760 761 case 'R': /* read an existing log file */ 762 if (args.pa_inputpath != NULL) 763 errx(EX_USAGE, "ERROR: option -R may only be " 764 "specified once."); 765 args.pa_inputpath = optarg; 766 if (args.pa_printfile == stderr) 767 args.pa_printfile = stdout; 768 args.pa_flags |= FLAG_READ_LOGFILE; 769 break; 770 771 case 't': /* target pid or process name */ 772 pmcstat_find_targets(&args, optarg); 773 774 args.pa_flags |= FLAG_HAS_TARGET; 775 args.pa_required |= FLAG_HAS_PROCESS_PMCS; 776 break; 777 778 case 'v': /* verbose */ 779 args.pa_verbosity++; 780 break; 781 782 case 'w': /* wait interval */ 783 interval = strtod(optarg, &end); 784 if (*end != '\0' || interval <= 0) 785 errx(EX_USAGE, "ERROR: Illegal wait interval " 786 "value \"%s\".", optarg); 787 args.pa_flags |= FLAG_HAS_WAIT_INTERVAL; 788 args.pa_required |= FLAG_HAS_COUNTING_PMCS; 789 args.pa_interval = interval; 790 break; 791 792 case 'W': /* toggle LOG_CSW */ 793 do_logproccsw = !do_logproccsw; 794 args.pa_required |= (FLAG_HAS_PROCESS_PMCS | 795 FLAG_HAS_COUNTING_PMCS | FLAG_HAS_OUTPUT_LOGFILE); 796 break; 797 798 case 'z': 799 graphdepth = strtod(optarg, &end); 800 if (*end != '\0' || graphdepth <= 0) 801 errx(EX_USAGE, "ERROR: Illegal callchain " 802 "depth \"%s\".", optarg); 803 args.pa_graphdepth = graphdepth; 804 args.pa_required |= FLAG_DO_CALLGRAPHS; 805 break; 806 807 case '?': 808 default: 809 pmcstat_show_usage(); 810 break; 811 812 } 813 814 args.pa_argc = (argc -= optind); 815 args.pa_argv = (argv += optind); 816 817 args.pa_cpumask = cpumask; /* For selecting CPUs using -R. */ 818 819 if (argc) /* command line present */ 820 args.pa_flags |= FLAG_HAS_COMMANDLINE; 821 822 if (args.pa_flags & (FLAG_DO_GPROF | FLAG_DO_CALLGRAPHS)) 823 args.pa_flags |= FLAG_DO_ANALYSIS; 824 825 /* 826 * Check invocation syntax. 827 */ 828 829 /* disallow -O and -R together */ 830 if (args.pa_outputpath && args.pa_inputpath) 831 errx(EX_USAGE, "ERROR: options -O and -R are mutually " 832 "exclusive."); 833 834 if (args.pa_flags & FLAG_READ_LOGFILE) { 835 errmsg = NULL; 836 if (args.pa_flags & FLAG_HAS_COMMANDLINE) 837 errmsg = "a command line specification"; 838 else if (args.pa_flags & FLAG_HAS_TARGET) 839 errmsg = "option -t"; 840 else if (!STAILQ_EMPTY(&args.pa_events)) 841 errmsg = "a PMC event specification"; 842 if (errmsg) 843 errx(EX_USAGE, "ERROR: option -R may not be used with " 844 "%s.", errmsg); 845 } else if (STAILQ_EMPTY(&args.pa_events)) 846 /* All other uses require a PMC spec. */ 847 pmcstat_show_usage(); 848 849 /* check for -t pid without a process PMC spec */ 850 if ((args.pa_required & FLAG_HAS_TARGET) && 851 (args.pa_flags & FLAG_HAS_PROCESS_PMCS) == 0) 852 errx(EX_USAGE, "ERROR: option -t requires a process mode PMC " 853 "to be specified."); 854 855 /* check for process-mode options without a command or -t pid */ 856 if ((args.pa_required & FLAG_HAS_PROCESS_PMCS) && 857 (args.pa_flags & (FLAG_HAS_COMMANDLINE | FLAG_HAS_TARGET)) == 0) 858 errx(EX_USAGE, "ERROR: options -d, -E, -p, -P, and -W require " 859 "a command line or target process."); 860 861 /* check for -p | -P without a target process of some sort */ 862 if ((args.pa_required & (FLAG_HAS_COMMANDLINE | FLAG_HAS_TARGET)) && 863 (args.pa_flags & (FLAG_HAS_COMMANDLINE | FLAG_HAS_TARGET)) == 0) 864 errx(EX_USAGE, "ERROR: options -P and -p require a " 865 "target process or a command line."); 866 867 /* check for process-mode options without a process-mode PMC */ 868 if ((args.pa_required & FLAG_HAS_PROCESS_PMCS) && 869 (args.pa_flags & FLAG_HAS_PROCESS_PMCS) == 0) 870 errx(EX_USAGE, "ERROR: options -d, -E, and -W require a " 871 "process mode PMC to be specified."); 872 873 /* check for -c cpu with no system mode PMCs or logfile. */ 874 if ((args.pa_required & FLAG_HAS_SYSTEM_PMCS) && 875 (args.pa_flags & FLAG_HAS_SYSTEM_PMCS) == 0 && 876 (args.pa_flags & FLAG_READ_LOGFILE) == 0) 877 errx(EX_USAGE, "ERROR: option -c requires at least one " 878 "system mode PMC to be specified."); 879 880 /* check for counting mode options without a counting PMC */ 881 if ((args.pa_required & FLAG_HAS_COUNTING_PMCS) && 882 (args.pa_flags & FLAG_HAS_COUNTING_PMCS) == 0) 883 errx(EX_USAGE, "ERROR: options -C, -W, -o and -w require at " 884 "least one counting mode PMC to be specified."); 885 886 /* check for sampling mode options without a sampling PMC spec */ 887 if ((args.pa_required & FLAG_HAS_SAMPLING_PMCS) && 888 (args.pa_flags & FLAG_HAS_SAMPLING_PMCS) == 0) 889 errx(EX_USAGE, "ERROR: options -N, -n and -O require at " 890 "least one sampling mode PMC to be specified."); 891 892 /* check if -g/-G are being used correctly */ 893 if ((args.pa_flags & FLAG_DO_ANALYSIS) && 894 !(args.pa_flags & (FLAG_HAS_SAMPLING_PMCS|FLAG_READ_LOGFILE))) 895 errx(EX_USAGE, "ERROR: options -g/-G require sampling PMCs " 896 "or -R to be specified."); 897 898 /* check if -O was spuriously specified */ 899 if ((args.pa_flags & FLAG_HAS_OUTPUT_LOGFILE) && 900 (args.pa_required & FLAG_HAS_OUTPUT_LOGFILE) == 0) 901 errx(EX_USAGE, 902 "ERROR: option -O is used only with options " 903 "-E, -P, -S and -W."); 904 905 /* -k kernel path require -g/-G or -R */ 906 if ((args.pa_flags & FLAG_HAS_KERNELPATH) && 907 (args.pa_flags & FLAG_DO_ANALYSIS) == 0 && 908 (args.pa_flags & FLAG_READ_LOGFILE) == 0) 909 errx(EX_USAGE, "ERROR: option -k is only used with -g/-R."); 910 911 /* -D only applies to gprof output mode (-g) */ 912 if ((args.pa_flags & FLAG_HAS_SAMPLESDIR) && 913 (args.pa_flags & FLAG_DO_GPROF) == 0) 914 errx(EX_USAGE, "ERROR: option -D is only used with -g."); 915 916 /* -M mapfile requires -g or -R */ 917 if (args.pa_mapfilename != NULL && 918 (args.pa_flags & FLAG_DO_GPROF) == 0 && 919 (args.pa_flags & FLAG_READ_LOGFILE) == 0) 920 errx(EX_USAGE, "ERROR: option -M is only used with -g/-R."); 921 922 /* 923 * Disallow textual output of sampling PMCs if counting PMCs 924 * have also been asked for, mostly because the combined output 925 * is difficult to make sense of. 926 */ 927 if ((args.pa_flags & FLAG_HAS_COUNTING_PMCS) && 928 (args.pa_flags & FLAG_HAS_SAMPLING_PMCS) && 929 ((args.pa_flags & FLAG_HAS_OUTPUT_LOGFILE) == 0)) 930 errx(EX_USAGE, "ERROR: option -O is required if counting and " 931 "sampling PMCs are specified together."); 932 933 /* 934 * Check if "-k kerneldir" was specified, and if whether 935 * 'kerneldir' actually refers to a a file. If so, use 936 * `dirname path` to determine the kernel directory. 937 */ 938 if (args.pa_flags & FLAG_HAS_KERNELPATH) { 939 (void) snprintf(buffer, sizeof(buffer), "%s%s", args.pa_fsroot, 940 args.pa_kernel); 941 if (stat(buffer, &sb) < 0) 942 err(EX_OSERR, "ERROR: Cannot locate kernel \"%s\"", 943 buffer); 944 if (!S_ISREG(sb.st_mode) && !S_ISDIR(sb.st_mode)) 945 errx(EX_USAGE, "ERROR: \"%s\": Unsupported file type.", 946 buffer); 947 if (!S_ISDIR(sb.st_mode)) { 948 tmp = args.pa_kernel; 949 args.pa_kernel = strdup(dirname(args.pa_kernel)); 950 free(tmp); 951 (void) snprintf(buffer, sizeof(buffer), "%s%s", 952 args.pa_fsroot, args.pa_kernel); 953 if (stat(buffer, &sb) < 0) 954 err(EX_OSERR, "ERROR: Cannot stat \"%s\"", 955 buffer); 956 if (!S_ISDIR(sb.st_mode)) 957 errx(EX_USAGE, "ERROR: \"%s\" is not a " 958 "directory.", buffer); 959 } 960 } 961 962 /* 963 * If we have a callgraph be created, select the outputfile. 964 */ 965 if (args.pa_flags & FLAG_DO_CALLGRAPHS) { 966 if (strcmp(graphfilename, "-") == 0) 967 args.pa_graphfile = args.pa_printfile; 968 else { 969 args.pa_graphfile = fopen(graphfilename, "w"); 970 if (args.pa_graphfile == NULL) 971 err(EX_OSERR, "ERROR: cannot open \"%s\" " 972 "for writing", graphfilename); 973 } 974 } 975 976 /* if we've been asked to process a log file, do that and exit */ 977 if (args.pa_flags & FLAG_READ_LOGFILE) { 978 /* 979 * Print the log in textual form if we haven't been 980 * asked to generate profiling information. 981 */ 982 if ((args.pa_flags & FLAG_DO_ANALYSIS) == 0) 983 args.pa_flags |= FLAG_DO_PRINT; 984 985 pmcstat_initialize_logging(&args); 986 args.pa_logfd = pmcstat_open_log(args.pa_inputpath, 987 PMCSTAT_OPEN_FOR_READ); 988 if ((args.pa_logparser = pmclog_open(args.pa_logfd)) == NULL) 989 err(EX_OSERR, "ERROR: Cannot create parser"); 990 pmcstat_process_log(&args); 991 pmcstat_shutdown_logging(&args); 992 exit(EX_OK); 993 } 994 995 /* otherwise, we've been asked to collect data */ 996 if (pmc_init() < 0) 997 err(EX_UNAVAILABLE, 998 "ERROR: Initialization of the pmc(3) library failed"); 999 1000 if ((npmc = pmc_npmc(0)) < 0) /* assume all CPUs are identical */ 1001 err(EX_OSERR, "ERROR: Cannot determine the number of PMCs " 1002 "on CPU %d", 0); 1003 1004 /* Allocate a kqueue */ 1005 if ((pmcstat_kq = kqueue()) < 0) 1006 err(EX_OSERR, "ERROR: Cannot allocate kqueue"); 1007 1008 /* 1009 * Configure the specified log file or setup a default log 1010 * consumer via a pipe. 1011 */ 1012 if (args.pa_required & FLAG_HAS_OUTPUT_LOGFILE) { 1013 if (args.pa_outputpath) 1014 args.pa_logfd = pmcstat_open_log(args.pa_outputpath, 1015 PMCSTAT_OPEN_FOR_WRITE); 1016 else { 1017 /* 1018 * process the log on the fly by reading it in 1019 * through a pipe. 1020 */ 1021 if (pipe(pipefd) < 0) 1022 err(EX_OSERR, "ERROR: pipe(2) failed"); 1023 1024 if (fcntl(pipefd[READPIPEFD], F_SETFL, O_NONBLOCK) < 0) 1025 err(EX_OSERR, "ERROR: fcntl(2) failed"); 1026 1027 EV_SET(&kev, pipefd[READPIPEFD], EVFILT_READ, EV_ADD, 1028 0, 0, NULL); 1029 1030 if (kevent(pmcstat_kq, &kev, 1, NULL, 0, NULL) < 0) 1031 err(EX_OSERR, "ERROR: Cannot register kevent"); 1032 1033 args.pa_logfd = pipefd[WRITEPIPEFD]; 1034 1035 args.pa_flags |= (FLAG_HAS_PIPE | FLAG_DO_PRINT); 1036 args.pa_logparser = pmclog_open(pipefd[READPIPEFD]); 1037 } 1038 1039 if (pmc_configure_logfile(args.pa_logfd) < 0) 1040 err(EX_OSERR, "ERROR: Cannot configure log file"); 1041 } 1042 1043 /* remember to check for driver errors if we are sampling or logging */ 1044 check_driver_stats = (args.pa_flags & FLAG_HAS_SAMPLING_PMCS) || 1045 (args.pa_flags & FLAG_HAS_OUTPUT_LOGFILE); 1046 1047 /* 1048 * Allocate PMCs. 1049 */ 1050 1051 STAILQ_FOREACH(ev, &args.pa_events, ev_next) { 1052 if (pmc_allocate(ev->ev_spec, ev->ev_mode, 1053 ev->ev_flags, ev->ev_cpu, &ev->ev_pmcid) < 0) 1054 err(EX_OSERR, "ERROR: Cannot allocate %s-mode pmc with " 1055 "specification \"%s\"", 1056 PMC_IS_SYSTEM_MODE(ev->ev_mode) ? "system" : "process", 1057 ev->ev_spec); 1058 1059 if (PMC_IS_SAMPLING_MODE(ev->ev_mode) && 1060 pmc_set(ev->ev_pmcid, ev->ev_count) < 0) 1061 err(EX_OSERR, "ERROR: Cannot set sampling count " 1062 "for PMC \"%s\"", ev->ev_name); 1063 } 1064 1065 /* compute printout widths */ 1066 STAILQ_FOREACH(ev, &args.pa_events, ev_next) { 1067 int counter_width; 1068 int display_width; 1069 int header_width; 1070 1071 (void) pmc_width(ev->ev_pmcid, &counter_width); 1072 header_width = strlen(ev->ev_name) + 2; /* prefix '%c/' */ 1073 display_width = (int) floor(counter_width / 3.32193) + 1; 1074 1075 if (PMC_IS_SYSTEM_MODE(ev->ev_mode)) 1076 header_width += 3; /* 2 digit CPU number + '/' */ 1077 1078 if (header_width > display_width) { 1079 ev->ev_fieldskip = 0; 1080 ev->ev_fieldwidth = header_width; 1081 } else { 1082 ev->ev_fieldskip = display_width - 1083 header_width; 1084 ev->ev_fieldwidth = display_width; 1085 } 1086 } 1087 1088 /* 1089 * If our output is being set to a terminal, register a handler 1090 * for window size changes. 1091 */ 1092 1093 if (isatty(fileno(args.pa_printfile))) { 1094 1095 if (ioctl(fileno(args.pa_printfile), TIOCGWINSZ, &ws) < 0) 1096 err(EX_OSERR, "ERROR: Cannot determine window size"); 1097 1098 pmcstat_displayheight = ws.ws_row - 1; 1099 1100 EV_SET(&kev, SIGWINCH, EVFILT_SIGNAL, EV_ADD, 0, 0, NULL); 1101 1102 if (kevent(pmcstat_kq, &kev, 1, NULL, 0, NULL) < 0) 1103 err(EX_OSERR, "ERROR: Cannot register kevent for " 1104 "SIGWINCH"); 1105 } 1106 1107 EV_SET(&kev, SIGINT, EVFILT_SIGNAL, EV_ADD, 0, 0, NULL); 1108 if (kevent(pmcstat_kq, &kev, 1, NULL, 0, NULL) < 0) 1109 err(EX_OSERR, "ERROR: Cannot register kevent for SIGINT"); 1110 1111 EV_SET(&kev, SIGIO, EVFILT_SIGNAL, EV_ADD, 0, 0, NULL); 1112 if (kevent(pmcstat_kq, &kev, 1, NULL, 0, NULL) < 0) 1113 err(EX_OSERR, "ERROR: Cannot register kevent for SIGIO"); 1114 1115 /* 1116 * An exec() failure of a forked child is signalled by the 1117 * child sending the parent a SIGCHLD. We don't register an 1118 * actual signal handler for SIGCHLD, but instead use our 1119 * kqueue to pick up the signal. 1120 */ 1121 EV_SET(&kev, SIGCHLD, EVFILT_SIGNAL, EV_ADD, 0, 0, NULL); 1122 if (kevent(pmcstat_kq, &kev, 1, NULL, 0, NULL) < 0) 1123 err(EX_OSERR, "ERROR: Cannot register kevent for SIGCHLD"); 1124 1125 /* setup a timer if we have counting mode PMCs needing to be printed */ 1126 if ((args.pa_flags & FLAG_HAS_COUNTING_PMCS) && 1127 (args.pa_required & FLAG_HAS_OUTPUT_LOGFILE) == 0) { 1128 EV_SET(&kev, 0, EVFILT_TIMER, EV_ADD, 0, 1129 args.pa_interval * 1000, NULL); 1130 1131 if (kevent(pmcstat_kq, &kev, 1, NULL, 0, NULL) < 0) 1132 err(EX_OSERR, "ERROR: Cannot register kevent for " 1133 "timer"); 1134 } 1135 1136 /* attach PMCs to the target process, starting it if specified */ 1137 if (args.pa_flags & FLAG_HAS_COMMANDLINE) 1138 pmcstat_create_process(&args); 1139 1140 if (check_driver_stats && pmc_get_driver_stats(&ds_start) < 0) 1141 err(EX_OSERR, "ERROR: Cannot retrieve driver statistics"); 1142 1143 /* Attach process pmcs to the target process. */ 1144 if (args.pa_flags & FLAG_HAS_TARGET) { 1145 if (SLIST_EMPTY(&args.pa_targets)) 1146 errx(EX_DATAERR, "ERROR: No matching target " 1147 "processes."); 1148 else 1149 pmcstat_attach_pmcs(&args); 1150 1151 if (pmcstat_kvm) { 1152 kvm_close(pmcstat_kvm); 1153 pmcstat_kvm = NULL; 1154 } 1155 } 1156 1157 /* start the pmcs */ 1158 pmcstat_start_pmcs(&args); 1159 1160 /* start the (commandline) process if needed */ 1161 if (args.pa_flags & FLAG_HAS_COMMANDLINE) 1162 pmcstat_start_process(); 1163 1164 /* initialize logging if printing the configured log */ 1165 if ((args.pa_flags & FLAG_DO_PRINT) && 1166 (args.pa_flags & (FLAG_HAS_PIPE | FLAG_HAS_OUTPUT_LOGFILE))) 1167 pmcstat_initialize_logging(&args); 1168 1169 /* Handle SIGINT using the kqueue loop */ 1170 sa.sa_handler = SIG_IGN; 1171 sa.sa_flags = 0; 1172 (void) sigemptyset(&sa.sa_mask); 1173 1174 if (sigaction(SIGINT, &sa, NULL) < 0) 1175 err(EX_OSERR, "ERROR: Cannot install signal handler"); 1176 1177 /* 1178 * loop till either the target process (if any) exits, or we 1179 * are killed by a SIGINT. 1180 */ 1181 runstate = PMCSTAT_RUNNING; 1182 do_print = 0; 1183 do { 1184 if ((c = kevent(pmcstat_kq, NULL, 0, &kev, 1, NULL)) <= 0) { 1185 if (errno != EINTR) 1186 err(EX_OSERR, "ERROR: kevent failed"); 1187 else 1188 continue; 1189 } 1190 1191 if (kev.flags & EV_ERROR) 1192 errc(EX_OSERR, kev.data, "ERROR: kevent failed"); 1193 1194 switch (kev.filter) { 1195 case EVFILT_PROC: /* target has exited */ 1196 if (args.pa_flags & (FLAG_HAS_OUTPUT_LOGFILE | 1197 FLAG_HAS_PIPE)) 1198 runstate = pmcstat_close_log(&args); 1199 else 1200 runstate = PMCSTAT_FINISHED; 1201 do_print = 1; 1202 break; 1203 1204 case EVFILT_READ: /* log file data is present */ 1205 runstate = pmcstat_process_log(&args); 1206 break; 1207 1208 case EVFILT_SIGNAL: 1209 if (kev.ident == SIGCHLD) { 1210 /* 1211 * The child process sends us a 1212 * SIGCHLD if its exec() failed. We 1213 * wait for it to exit and then exit 1214 * ourselves. 1215 */ 1216 (void) wait(&c); 1217 runstate = PMCSTAT_FINISHED; 1218 } else if (kev.ident == SIGIO) { 1219 /* 1220 * We get a SIGIO if a PMC loses all 1221 * of its targets, or if logfile 1222 * writes encounter an error. 1223 */ 1224 if (args.pa_flags & (FLAG_HAS_OUTPUT_LOGFILE | 1225 FLAG_HAS_PIPE)) { 1226 runstate = pmcstat_close_log(&args); 1227 if (args.pa_flags & 1228 (FLAG_DO_PRINT|FLAG_DO_ANALYSIS)) 1229 pmcstat_process_log(&args); 1230 } 1231 do_print = 1; /* print PMCs at exit */ 1232 runstate = PMCSTAT_FINISHED; 1233 } else if (kev.ident == SIGINT) { 1234 /* Kill the child process if we started it */ 1235 if (args.pa_flags & FLAG_HAS_COMMANDLINE) 1236 pmcstat_kill_process(&args); 1237 runstate = PMCSTAT_FINISHED; 1238 } else if (kev.ident == SIGWINCH) { 1239 if (ioctl(fileno(args.pa_printfile), 1240 TIOCGWINSZ, &ws) < 0) 1241 err(EX_OSERR, "ERROR: Cannot determine " 1242 "window size"); 1243 pmcstat_displayheight = ws.ws_row - 1; 1244 } else 1245 assert(0); 1246 1247 break; 1248 1249 case EVFILT_TIMER: /* print out counting PMCs */ 1250 do_print = 1; 1251 break; 1252 1253 } 1254 1255 if (do_print && 1256 (args.pa_required & FLAG_HAS_OUTPUT_LOGFILE) == 0) { 1257 pmcstat_print_pmcs(&args); 1258 if (runstate == PMCSTAT_FINISHED && /* final newline */ 1259 (args.pa_flags & FLAG_DO_PRINT) == 0) 1260 (void) fprintf(args.pa_printfile, "\n"); 1261 do_print = 0; 1262 } 1263 1264 } while (runstate != PMCSTAT_FINISHED); 1265 1266 /* flush any pending log entries */ 1267 if (args.pa_flags & (FLAG_HAS_OUTPUT_LOGFILE | FLAG_HAS_PIPE)) 1268 pmc_flush_logfile(); 1269 1270 pmcstat_cleanup(&args); 1271 1272 free(args.pa_kernel); 1273 1274 /* check if the driver lost any samples or events */ 1275 if (check_driver_stats) { 1276 if (pmc_get_driver_stats(&ds_end) < 0) 1277 err(EX_OSERR, "ERROR: Cannot retrieve driver " 1278 "statistics"); 1279 if (ds_start.pm_intr_bufferfull != ds_end.pm_intr_bufferfull && 1280 args.pa_verbosity > 0) 1281 warnx("WARNING: some samples were dropped. Please " 1282 "consider tuning the \"kern.hwpmc.nsamples\" " 1283 "tunable."); 1284 if (ds_start.pm_buffer_requests_failed != 1285 ds_end.pm_buffer_requests_failed && 1286 args.pa_verbosity > 0) 1287 warnx("WARNING: some events were discarded. Please " 1288 "consider tuning the \"kern.hwpmc.nbuffers\" " 1289 "tunable."); 1290 } 1291 1292 exit(EX_OK); 1293 } 1294