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 (ncpu > 1) { 584 if (sysctlbyname("machdep.hlt_cpus", &haltedcpus, &dummy, 585 NULL, 0) < 0) 586 err(EX_OSERR, "ERROR: Cannot determine which CPUs are " 587 "halted"); 588 cpumask &= ~haltedcpus; 589 } 590 591 while ((option = getopt(argc, argv, 592 "CD:EG:M:NO:P:R:S:Wc:dgk:n:o:p:qr:s:t:vw:z:")) != -1) 593 switch (option) { 594 case 'C': /* cumulative values */ 595 use_cumulative_counts = !use_cumulative_counts; 596 args.pa_required |= FLAG_HAS_COUNTING_PMCS; 597 break; 598 599 case 'c': /* CPU */ 600 601 if (optarg[0] == '*' && optarg[1] == '\0') 602 cpumask = (1 << ncpu) - 1; 603 else 604 cpumask = pmcstat_get_cpumask(optarg); 605 606 args.pa_required |= FLAG_HAS_SYSTEM_PMCS; 607 break; 608 609 case 'D': 610 if (stat(optarg, &sb) < 0) 611 err(EX_OSERR, "ERROR: Cannot stat \"%s\"", 612 optarg); 613 if (!S_ISDIR(sb.st_mode)) 614 errx(EX_USAGE, "ERROR: \"%s\" is not a " 615 "directory.", optarg); 616 args.pa_samplesdir = optarg; 617 args.pa_flags |= FLAG_HAS_SAMPLESDIR; 618 args.pa_required |= FLAG_DO_GPROF; 619 break; 620 621 case 'd': /* toggle descendents */ 622 do_descendants = !do_descendants; 623 args.pa_required |= FLAG_HAS_PROCESS_PMCS; 624 break; 625 626 case 'G': /* produce a system-wide callgraph */ 627 args.pa_flags |= FLAG_DO_CALLGRAPHS; 628 graphfilename = optarg; 629 break; 630 631 case 'g': /* produce gprof compatible profiles */ 632 args.pa_flags |= FLAG_DO_GPROF; 633 break; 634 635 case 'k': /* pathname to the kernel */ 636 free(args.pa_kernel); 637 args.pa_kernel = strdup(optarg); 638 args.pa_required |= FLAG_DO_ANALYSIS; 639 args.pa_flags |= FLAG_HAS_KERNELPATH; 640 break; 641 642 case 'E': /* log process exit */ 643 do_logprocexit = !do_logprocexit; 644 args.pa_required |= (FLAG_HAS_PROCESS_PMCS | 645 FLAG_HAS_COUNTING_PMCS | FLAG_HAS_OUTPUT_LOGFILE); 646 break; 647 648 case 'M': /* mapfile */ 649 args.pa_mapfilename = optarg; 650 break; 651 652 case 'N': 653 do_callchain = !do_callchain; 654 args.pa_required |= FLAG_HAS_SAMPLING_PMCS; 655 break; 656 657 case 'p': /* process virtual counting PMC */ 658 case 's': /* system-wide counting PMC */ 659 case 'P': /* process virtual sampling PMC */ 660 case 'S': /* system-wide sampling PMC */ 661 if ((ev = malloc(sizeof(*ev))) == NULL) 662 errx(EX_SOFTWARE, "ERROR: Out of memory."); 663 664 switch (option) { 665 case 'p': ev->ev_mode = PMC_MODE_TC; break; 666 case 's': ev->ev_mode = PMC_MODE_SC; break; 667 case 'P': ev->ev_mode = PMC_MODE_TS; break; 668 case 'S': ev->ev_mode = PMC_MODE_SS; break; 669 } 670 671 if (option == 'P' || option == 'p') { 672 args.pa_flags |= FLAG_HAS_PROCESS_PMCS; 673 args.pa_required |= (FLAG_HAS_COMMANDLINE | 674 FLAG_HAS_TARGET); 675 } 676 677 if (option == 'P' || option == 'S') { 678 args.pa_flags |= FLAG_HAS_SAMPLING_PMCS; 679 args.pa_required |= (FLAG_HAS_PIPE | 680 FLAG_HAS_OUTPUT_LOGFILE); 681 } 682 683 if (option == 'p' || option == 's') 684 args.pa_flags |= FLAG_HAS_COUNTING_PMCS; 685 686 if (option == 's' || option == 'S') 687 args.pa_flags |= FLAG_HAS_SYSTEM_PMCS; 688 689 ev->ev_spec = strdup(optarg); 690 691 if (option == 'S' || option == 'P') 692 ev->ev_count = current_sampling_count; 693 else 694 ev->ev_count = -1; 695 696 if (option == 'S' || option == 's') 697 ev->ev_cpu = ffs(cpumask) - 1; 698 else 699 ev->ev_cpu = PMC_CPU_ANY; 700 701 ev->ev_flags = 0; 702 if (do_callchain) 703 ev->ev_flags |= PMC_F_CALLCHAIN; 704 if (do_descendants) 705 ev->ev_flags |= PMC_F_DESCENDANTS; 706 if (do_logprocexit) 707 ev->ev_flags |= PMC_F_LOG_PROCEXIT; 708 if (do_logproccsw) 709 ev->ev_flags |= PMC_F_LOG_PROCCSW; 710 711 ev->ev_cumulative = use_cumulative_counts; 712 713 ev->ev_saved = 0LL; 714 ev->ev_pmcid = PMC_ID_INVALID; 715 716 /* extract event name */ 717 c = strcspn(optarg, ", \t"); 718 ev->ev_name = malloc(c + 1); 719 (void) strncpy(ev->ev_name, optarg, c); 720 *(ev->ev_name + c) = '\0'; 721 722 STAILQ_INSERT_TAIL(&args.pa_events, ev, ev_next); 723 724 if (option == 's' || option == 'S') 725 pmcstat_clone_event_descriptor(&args, ev, 726 cpumask & ~(1 << ev->ev_cpu)); 727 728 break; 729 730 case 'n': /* sampling count */ 731 current_sampling_count = strtol(optarg, &end, 0); 732 if (*end != '\0' || current_sampling_count <= 0) 733 errx(EX_USAGE, 734 "ERROR: Illegal count value \"%s\".", 735 optarg); 736 args.pa_required |= FLAG_HAS_SAMPLING_PMCS; 737 break; 738 739 case 'o': /* outputfile */ 740 if (args.pa_printfile != NULL) 741 (void) fclose(args.pa_printfile); 742 if ((args.pa_printfile = fopen(optarg, "w")) == NULL) 743 errx(EX_OSERR, "ERROR: cannot open \"%s\" for " 744 "writing.", optarg); 745 args.pa_flags |= FLAG_DO_PRINT; 746 break; 747 748 case 'O': /* sampling output */ 749 if (args.pa_outputpath) 750 errx(EX_USAGE, "ERROR: option -O may only be " 751 "specified once."); 752 args.pa_outputpath = optarg; 753 args.pa_flags |= FLAG_HAS_OUTPUT_LOGFILE; 754 break; 755 756 case 'q': /* quiet mode */ 757 args.pa_verbosity = 0; 758 break; 759 760 case 'r': /* root FS path */ 761 args.pa_fsroot = optarg; 762 break; 763 764 case 'R': /* read an existing log file */ 765 if (args.pa_inputpath != NULL) 766 errx(EX_USAGE, "ERROR: option -R may only be " 767 "specified once."); 768 args.pa_inputpath = optarg; 769 if (args.pa_printfile == stderr) 770 args.pa_printfile = stdout; 771 args.pa_flags |= FLAG_READ_LOGFILE; 772 break; 773 774 case 't': /* target pid or process name */ 775 pmcstat_find_targets(&args, optarg); 776 777 args.pa_flags |= FLAG_HAS_TARGET; 778 args.pa_required |= FLAG_HAS_PROCESS_PMCS; 779 break; 780 781 case 'v': /* verbose */ 782 args.pa_verbosity++; 783 break; 784 785 case 'w': /* wait interval */ 786 interval = strtod(optarg, &end); 787 if (*end != '\0' || interval <= 0) 788 errx(EX_USAGE, "ERROR: Illegal wait interval " 789 "value \"%s\".", optarg); 790 args.pa_flags |= FLAG_HAS_WAIT_INTERVAL; 791 args.pa_required |= FLAG_HAS_COUNTING_PMCS; 792 args.pa_interval = interval; 793 break; 794 795 case 'W': /* toggle LOG_CSW */ 796 do_logproccsw = !do_logproccsw; 797 args.pa_required |= (FLAG_HAS_PROCESS_PMCS | 798 FLAG_HAS_COUNTING_PMCS | FLAG_HAS_OUTPUT_LOGFILE); 799 break; 800 801 case 'z': 802 graphdepth = strtod(optarg, &end); 803 if (*end != '\0' || graphdepth <= 0) 804 errx(EX_USAGE, "ERROR: Illegal callchain " 805 "depth \"%s\".", optarg); 806 args.pa_graphdepth = graphdepth; 807 args.pa_required |= FLAG_DO_CALLGRAPHS; 808 break; 809 810 case '?': 811 default: 812 pmcstat_show_usage(); 813 break; 814 815 } 816 817 args.pa_argc = (argc -= optind); 818 args.pa_argv = (argv += optind); 819 820 args.pa_cpumask = cpumask; /* For selecting CPUs using -R. */ 821 822 if (argc) /* command line present */ 823 args.pa_flags |= FLAG_HAS_COMMANDLINE; 824 825 if (args.pa_flags & (FLAG_DO_GPROF | FLAG_DO_CALLGRAPHS)) 826 args.pa_flags |= FLAG_DO_ANALYSIS; 827 828 /* 829 * Check invocation syntax. 830 */ 831 832 /* disallow -O and -R together */ 833 if (args.pa_outputpath && args.pa_inputpath) 834 errx(EX_USAGE, "ERROR: options -O and -R are mutually " 835 "exclusive."); 836 837 if (args.pa_flags & FLAG_READ_LOGFILE) { 838 errmsg = NULL; 839 if (args.pa_flags & FLAG_HAS_COMMANDLINE) 840 errmsg = "a command line specification"; 841 else if (args.pa_flags & FLAG_HAS_TARGET) 842 errmsg = "option -t"; 843 else if (!STAILQ_EMPTY(&args.pa_events)) 844 errmsg = "a PMC event specification"; 845 if (errmsg) 846 errx(EX_USAGE, "ERROR: option -R may not be used with " 847 "%s.", errmsg); 848 } else if (STAILQ_EMPTY(&args.pa_events)) 849 /* All other uses require a PMC spec. */ 850 pmcstat_show_usage(); 851 852 /* check for -t pid without a process PMC spec */ 853 if ((args.pa_required & FLAG_HAS_TARGET) && 854 (args.pa_flags & FLAG_HAS_PROCESS_PMCS) == 0) 855 errx(EX_USAGE, "ERROR: option -t requires a process mode PMC " 856 "to be specified."); 857 858 /* check for process-mode options without a command or -t pid */ 859 if ((args.pa_required & FLAG_HAS_PROCESS_PMCS) && 860 (args.pa_flags & (FLAG_HAS_COMMANDLINE | FLAG_HAS_TARGET)) == 0) 861 errx(EX_USAGE, "ERROR: options -d, -E, -p, -P, and -W require " 862 "a command line or target process."); 863 864 /* check for -p | -P without a target process of some sort */ 865 if ((args.pa_required & (FLAG_HAS_COMMANDLINE | FLAG_HAS_TARGET)) && 866 (args.pa_flags & (FLAG_HAS_COMMANDLINE | FLAG_HAS_TARGET)) == 0) 867 errx(EX_USAGE, "ERROR: options -P and -p require a " 868 "target process or a command line."); 869 870 /* check for process-mode options without a process-mode PMC */ 871 if ((args.pa_required & FLAG_HAS_PROCESS_PMCS) && 872 (args.pa_flags & FLAG_HAS_PROCESS_PMCS) == 0) 873 errx(EX_USAGE, "ERROR: options -d, -E, and -W require a " 874 "process mode PMC to be specified."); 875 876 /* check for -c cpu with no system mode PMCs or logfile. */ 877 if ((args.pa_required & FLAG_HAS_SYSTEM_PMCS) && 878 (args.pa_flags & FLAG_HAS_SYSTEM_PMCS) == 0 && 879 (args.pa_flags & FLAG_READ_LOGFILE) == 0) 880 errx(EX_USAGE, "ERROR: option -c requires at least one " 881 "system mode PMC to be specified."); 882 883 /* check for counting mode options without a counting PMC */ 884 if ((args.pa_required & FLAG_HAS_COUNTING_PMCS) && 885 (args.pa_flags & FLAG_HAS_COUNTING_PMCS) == 0) 886 errx(EX_USAGE, "ERROR: options -C, -W, -o and -w require at " 887 "least one counting mode PMC to be specified."); 888 889 /* check for sampling mode options without a sampling PMC spec */ 890 if ((args.pa_required & FLAG_HAS_SAMPLING_PMCS) && 891 (args.pa_flags & FLAG_HAS_SAMPLING_PMCS) == 0) 892 errx(EX_USAGE, "ERROR: options -N, -n and -O require at " 893 "least one sampling mode PMC to be specified."); 894 895 /* check if -g/-G are being used correctly */ 896 if ((args.pa_flags & FLAG_DO_ANALYSIS) && 897 !(args.pa_flags & (FLAG_HAS_SAMPLING_PMCS|FLAG_READ_LOGFILE))) 898 errx(EX_USAGE, "ERROR: options -g/-G require sampling PMCs " 899 "or -R to be specified."); 900 901 /* check if -O was spuriously specified */ 902 if ((args.pa_flags & FLAG_HAS_OUTPUT_LOGFILE) && 903 (args.pa_required & FLAG_HAS_OUTPUT_LOGFILE) == 0) 904 errx(EX_USAGE, 905 "ERROR: option -O is used only with options " 906 "-E, -P, -S and -W."); 907 908 /* -k kernel path require -g/-G or -R */ 909 if ((args.pa_flags & FLAG_HAS_KERNELPATH) && 910 (args.pa_flags & FLAG_DO_ANALYSIS) == 0 && 911 (args.pa_flags & FLAG_READ_LOGFILE) == 0) 912 errx(EX_USAGE, "ERROR: option -k is only used with -g/-R."); 913 914 /* -D only applies to gprof output mode (-g) */ 915 if ((args.pa_flags & FLAG_HAS_SAMPLESDIR) && 916 (args.pa_flags & FLAG_DO_GPROF) == 0) 917 errx(EX_USAGE, "ERROR: option -D is only used with -g."); 918 919 /* -M mapfile requires -g or -R */ 920 if (args.pa_mapfilename != NULL && 921 (args.pa_flags & FLAG_DO_GPROF) == 0 && 922 (args.pa_flags & FLAG_READ_LOGFILE) == 0) 923 errx(EX_USAGE, "ERROR: option -M is only used with -g/-R."); 924 925 /* 926 * Disallow textual output of sampling PMCs if counting PMCs 927 * have also been asked for, mostly because the combined output 928 * is difficult to make sense of. 929 */ 930 if ((args.pa_flags & FLAG_HAS_COUNTING_PMCS) && 931 (args.pa_flags & FLAG_HAS_SAMPLING_PMCS) && 932 ((args.pa_flags & FLAG_HAS_OUTPUT_LOGFILE) == 0)) 933 errx(EX_USAGE, "ERROR: option -O is required if counting and " 934 "sampling PMCs are specified together."); 935 936 /* 937 * Check if "-k kerneldir" was specified, and if whether 938 * 'kerneldir' actually refers to a a file. If so, use 939 * `dirname path` to determine the kernel directory. 940 */ 941 if (args.pa_flags & FLAG_HAS_KERNELPATH) { 942 (void) snprintf(buffer, sizeof(buffer), "%s%s", args.pa_fsroot, 943 args.pa_kernel); 944 if (stat(buffer, &sb) < 0) 945 err(EX_OSERR, "ERROR: Cannot locate kernel \"%s\"", 946 buffer); 947 if (!S_ISREG(sb.st_mode) && !S_ISDIR(sb.st_mode)) 948 errx(EX_USAGE, "ERROR: \"%s\": Unsupported file type.", 949 buffer); 950 if (!S_ISDIR(sb.st_mode)) { 951 tmp = args.pa_kernel; 952 args.pa_kernel = strdup(dirname(args.pa_kernel)); 953 free(tmp); 954 (void) snprintf(buffer, sizeof(buffer), "%s%s", 955 args.pa_fsroot, args.pa_kernel); 956 if (stat(buffer, &sb) < 0) 957 err(EX_OSERR, "ERROR: Cannot stat \"%s\"", 958 buffer); 959 if (!S_ISDIR(sb.st_mode)) 960 errx(EX_USAGE, "ERROR: \"%s\" is not a " 961 "directory.", buffer); 962 } 963 } 964 965 /* 966 * If we have a callgraph be created, select the outputfile. 967 */ 968 if (args.pa_flags & FLAG_DO_CALLGRAPHS) { 969 if (strcmp(graphfilename, "-") == 0) 970 args.pa_graphfile = args.pa_printfile; 971 else { 972 args.pa_graphfile = fopen(graphfilename, "w"); 973 if (args.pa_graphfile == NULL) 974 err(EX_OSERR, "ERROR: cannot open \"%s\" " 975 "for writing", graphfilename); 976 } 977 } 978 979 /* if we've been asked to process a log file, do that and exit */ 980 if (args.pa_flags & FLAG_READ_LOGFILE) { 981 /* 982 * Print the log in textual form if we haven't been 983 * asked to generate profiling information. 984 */ 985 if ((args.pa_flags & FLAG_DO_ANALYSIS) == 0) 986 args.pa_flags |= FLAG_DO_PRINT; 987 988 pmcstat_initialize_logging(&args); 989 args.pa_logfd = pmcstat_open_log(args.pa_inputpath, 990 PMCSTAT_OPEN_FOR_READ); 991 if ((args.pa_logparser = pmclog_open(args.pa_logfd)) == NULL) 992 err(EX_OSERR, "ERROR: Cannot create parser"); 993 pmcstat_process_log(&args); 994 pmcstat_shutdown_logging(&args); 995 exit(EX_OK); 996 } 997 998 /* otherwise, we've been asked to collect data */ 999 if (pmc_init() < 0) 1000 err(EX_UNAVAILABLE, 1001 "ERROR: Initialization of the pmc(3) library failed"); 1002 1003 if ((npmc = pmc_npmc(0)) < 0) /* assume all CPUs are identical */ 1004 err(EX_OSERR, "ERROR: Cannot determine the number of PMCs " 1005 "on CPU %d", 0); 1006 1007 /* Allocate a kqueue */ 1008 if ((pmcstat_kq = kqueue()) < 0) 1009 err(EX_OSERR, "ERROR: Cannot allocate kqueue"); 1010 1011 /* 1012 * Configure the specified log file or setup a default log 1013 * consumer via a pipe. 1014 */ 1015 if (args.pa_required & FLAG_HAS_OUTPUT_LOGFILE) { 1016 if (args.pa_outputpath) 1017 args.pa_logfd = pmcstat_open_log(args.pa_outputpath, 1018 PMCSTAT_OPEN_FOR_WRITE); 1019 else { 1020 /* 1021 * process the log on the fly by reading it in 1022 * through a pipe. 1023 */ 1024 if (pipe(pipefd) < 0) 1025 err(EX_OSERR, "ERROR: pipe(2) failed"); 1026 1027 if (fcntl(pipefd[READPIPEFD], F_SETFL, O_NONBLOCK) < 0) 1028 err(EX_OSERR, "ERROR: fcntl(2) failed"); 1029 1030 EV_SET(&kev, pipefd[READPIPEFD], EVFILT_READ, EV_ADD, 1031 0, 0, NULL); 1032 1033 if (kevent(pmcstat_kq, &kev, 1, NULL, 0, NULL) < 0) 1034 err(EX_OSERR, "ERROR: Cannot register kevent"); 1035 1036 args.pa_logfd = pipefd[WRITEPIPEFD]; 1037 1038 args.pa_flags |= (FLAG_HAS_PIPE | FLAG_DO_PRINT); 1039 args.pa_logparser = pmclog_open(pipefd[READPIPEFD]); 1040 } 1041 1042 if (pmc_configure_logfile(args.pa_logfd) < 0) 1043 err(EX_OSERR, "ERROR: Cannot configure log file"); 1044 } 1045 1046 /* remember to check for driver errors if we are sampling or logging */ 1047 check_driver_stats = (args.pa_flags & FLAG_HAS_SAMPLING_PMCS) || 1048 (args.pa_flags & FLAG_HAS_OUTPUT_LOGFILE); 1049 1050 /* 1051 * Allocate PMCs. 1052 */ 1053 1054 STAILQ_FOREACH(ev, &args.pa_events, ev_next) { 1055 if (pmc_allocate(ev->ev_spec, ev->ev_mode, 1056 ev->ev_flags, ev->ev_cpu, &ev->ev_pmcid) < 0) 1057 err(EX_OSERR, "ERROR: Cannot allocate %s-mode pmc with " 1058 "specification \"%s\"", 1059 PMC_IS_SYSTEM_MODE(ev->ev_mode) ? "system" : "process", 1060 ev->ev_spec); 1061 1062 if (PMC_IS_SAMPLING_MODE(ev->ev_mode) && 1063 pmc_set(ev->ev_pmcid, ev->ev_count) < 0) 1064 err(EX_OSERR, "ERROR: Cannot set sampling count " 1065 "for PMC \"%s\"", ev->ev_name); 1066 } 1067 1068 /* compute printout widths */ 1069 STAILQ_FOREACH(ev, &args.pa_events, ev_next) { 1070 int counter_width; 1071 int display_width; 1072 int header_width; 1073 1074 (void) pmc_width(ev->ev_pmcid, &counter_width); 1075 header_width = strlen(ev->ev_name) + 2; /* prefix '%c/' */ 1076 display_width = (int) floor(counter_width / 3.32193) + 1; 1077 1078 if (PMC_IS_SYSTEM_MODE(ev->ev_mode)) 1079 header_width += 3; /* 2 digit CPU number + '/' */ 1080 1081 if (header_width > display_width) { 1082 ev->ev_fieldskip = 0; 1083 ev->ev_fieldwidth = header_width; 1084 } else { 1085 ev->ev_fieldskip = display_width - 1086 header_width; 1087 ev->ev_fieldwidth = display_width; 1088 } 1089 } 1090 1091 /* 1092 * If our output is being set to a terminal, register a handler 1093 * for window size changes. 1094 */ 1095 1096 if (isatty(fileno(args.pa_printfile))) { 1097 1098 if (ioctl(fileno(args.pa_printfile), TIOCGWINSZ, &ws) < 0) 1099 err(EX_OSERR, "ERROR: Cannot determine window size"); 1100 1101 pmcstat_displayheight = ws.ws_row - 1; 1102 1103 EV_SET(&kev, SIGWINCH, EVFILT_SIGNAL, EV_ADD, 0, 0, NULL); 1104 1105 if (kevent(pmcstat_kq, &kev, 1, NULL, 0, NULL) < 0) 1106 err(EX_OSERR, "ERROR: Cannot register kevent for " 1107 "SIGWINCH"); 1108 } 1109 1110 EV_SET(&kev, SIGINT, EVFILT_SIGNAL, EV_ADD, 0, 0, NULL); 1111 if (kevent(pmcstat_kq, &kev, 1, NULL, 0, NULL) < 0) 1112 err(EX_OSERR, "ERROR: Cannot register kevent for SIGINT"); 1113 1114 EV_SET(&kev, SIGIO, EVFILT_SIGNAL, EV_ADD, 0, 0, NULL); 1115 if (kevent(pmcstat_kq, &kev, 1, NULL, 0, NULL) < 0) 1116 err(EX_OSERR, "ERROR: Cannot register kevent for SIGIO"); 1117 1118 /* 1119 * An exec() failure of a forked child is signalled by the 1120 * child sending the parent a SIGCHLD. We don't register an 1121 * actual signal handler for SIGCHLD, but instead use our 1122 * kqueue to pick up the signal. 1123 */ 1124 EV_SET(&kev, SIGCHLD, EVFILT_SIGNAL, EV_ADD, 0, 0, NULL); 1125 if (kevent(pmcstat_kq, &kev, 1, NULL, 0, NULL) < 0) 1126 err(EX_OSERR, "ERROR: Cannot register kevent for SIGCHLD"); 1127 1128 /* setup a timer if we have counting mode PMCs needing to be printed */ 1129 if ((args.pa_flags & FLAG_HAS_COUNTING_PMCS) && 1130 (args.pa_required & FLAG_HAS_OUTPUT_LOGFILE) == 0) { 1131 EV_SET(&kev, 0, EVFILT_TIMER, EV_ADD, 0, 1132 args.pa_interval * 1000, NULL); 1133 1134 if (kevent(pmcstat_kq, &kev, 1, NULL, 0, NULL) < 0) 1135 err(EX_OSERR, "ERROR: Cannot register kevent for " 1136 "timer"); 1137 } 1138 1139 /* attach PMCs to the target process, starting it if specified */ 1140 if (args.pa_flags & FLAG_HAS_COMMANDLINE) 1141 pmcstat_create_process(&args); 1142 1143 if (check_driver_stats && pmc_get_driver_stats(&ds_start) < 0) 1144 err(EX_OSERR, "ERROR: Cannot retrieve driver statistics"); 1145 1146 /* Attach process pmcs to the target process. */ 1147 if (args.pa_flags & FLAG_HAS_TARGET) { 1148 if (SLIST_EMPTY(&args.pa_targets)) 1149 errx(EX_DATAERR, "ERROR: No matching target " 1150 "processes."); 1151 else 1152 pmcstat_attach_pmcs(&args); 1153 1154 if (pmcstat_kvm) { 1155 kvm_close(pmcstat_kvm); 1156 pmcstat_kvm = NULL; 1157 } 1158 } 1159 1160 /* start the pmcs */ 1161 pmcstat_start_pmcs(&args); 1162 1163 /* start the (commandline) process if needed */ 1164 if (args.pa_flags & FLAG_HAS_COMMANDLINE) 1165 pmcstat_start_process(); 1166 1167 /* initialize logging if printing the configured log */ 1168 if ((args.pa_flags & FLAG_DO_PRINT) && 1169 (args.pa_flags & (FLAG_HAS_PIPE | FLAG_HAS_OUTPUT_LOGFILE))) 1170 pmcstat_initialize_logging(&args); 1171 1172 /* Handle SIGINT using the kqueue loop */ 1173 sa.sa_handler = SIG_IGN; 1174 sa.sa_flags = 0; 1175 (void) sigemptyset(&sa.sa_mask); 1176 1177 if (sigaction(SIGINT, &sa, NULL) < 0) 1178 err(EX_OSERR, "ERROR: Cannot install signal handler"); 1179 1180 /* 1181 * loop till either the target process (if any) exits, or we 1182 * are killed by a SIGINT. 1183 */ 1184 runstate = PMCSTAT_RUNNING; 1185 do_print = 0; 1186 do { 1187 if ((c = kevent(pmcstat_kq, NULL, 0, &kev, 1, NULL)) <= 0) { 1188 if (errno != EINTR) 1189 err(EX_OSERR, "ERROR: kevent failed"); 1190 else 1191 continue; 1192 } 1193 1194 if (kev.flags & EV_ERROR) 1195 errc(EX_OSERR, kev.data, "ERROR: kevent failed"); 1196 1197 switch (kev.filter) { 1198 case EVFILT_PROC: /* target has exited */ 1199 if (args.pa_flags & (FLAG_HAS_OUTPUT_LOGFILE | 1200 FLAG_HAS_PIPE)) 1201 runstate = pmcstat_close_log(&args); 1202 else 1203 runstate = PMCSTAT_FINISHED; 1204 do_print = 1; 1205 break; 1206 1207 case EVFILT_READ: /* log file data is present */ 1208 runstate = pmcstat_process_log(&args); 1209 break; 1210 1211 case EVFILT_SIGNAL: 1212 if (kev.ident == SIGCHLD) { 1213 /* 1214 * The child process sends us a 1215 * SIGCHLD if its exec() failed. We 1216 * wait for it to exit and then exit 1217 * ourselves. 1218 */ 1219 (void) wait(&c); 1220 runstate = PMCSTAT_FINISHED; 1221 } else if (kev.ident == SIGIO) { 1222 /* 1223 * We get a SIGIO if a PMC loses all 1224 * of its targets, or if logfile 1225 * writes encounter an error. 1226 */ 1227 if (args.pa_flags & (FLAG_HAS_OUTPUT_LOGFILE | 1228 FLAG_HAS_PIPE)) { 1229 runstate = pmcstat_close_log(&args); 1230 if (args.pa_flags & 1231 (FLAG_DO_PRINT|FLAG_DO_ANALYSIS)) 1232 pmcstat_process_log(&args); 1233 } 1234 do_print = 1; /* print PMCs at exit */ 1235 runstate = PMCSTAT_FINISHED; 1236 } else if (kev.ident == SIGINT) { 1237 /* Kill the child process if we started it */ 1238 if (args.pa_flags & FLAG_HAS_COMMANDLINE) 1239 pmcstat_kill_process(&args); 1240 runstate = PMCSTAT_FINISHED; 1241 } else if (kev.ident == SIGWINCH) { 1242 if (ioctl(fileno(args.pa_printfile), 1243 TIOCGWINSZ, &ws) < 0) 1244 err(EX_OSERR, "ERROR: Cannot determine " 1245 "window size"); 1246 pmcstat_displayheight = ws.ws_row - 1; 1247 } else 1248 assert(0); 1249 1250 break; 1251 1252 case EVFILT_TIMER: /* print out counting PMCs */ 1253 do_print = 1; 1254 break; 1255 1256 } 1257 1258 if (do_print && 1259 (args.pa_required & FLAG_HAS_OUTPUT_LOGFILE) == 0) { 1260 pmcstat_print_pmcs(&args); 1261 if (runstate == PMCSTAT_FINISHED && /* final newline */ 1262 (args.pa_flags & FLAG_DO_PRINT) == 0) 1263 (void) fprintf(args.pa_printfile, "\n"); 1264 do_print = 0; 1265 } 1266 1267 } while (runstate != PMCSTAT_FINISHED); 1268 1269 /* flush any pending log entries */ 1270 if (args.pa_flags & (FLAG_HAS_OUTPUT_LOGFILE | FLAG_HAS_PIPE)) 1271 pmc_flush_logfile(); 1272 1273 pmcstat_cleanup(&args); 1274 1275 free(args.pa_kernel); 1276 1277 /* check if the driver lost any samples or events */ 1278 if (check_driver_stats) { 1279 if (pmc_get_driver_stats(&ds_end) < 0) 1280 err(EX_OSERR, "ERROR: Cannot retrieve driver " 1281 "statistics"); 1282 if (ds_start.pm_intr_bufferfull != ds_end.pm_intr_bufferfull && 1283 args.pa_verbosity > 0) 1284 warnx("WARNING: some samples were dropped. Please " 1285 "consider tuning the \"kern.hwpmc.nsamples\" " 1286 "tunable."); 1287 if (ds_start.pm_buffer_requests_failed != 1288 ds_end.pm_buffer_requests_failed && 1289 args.pa_verbosity > 0) 1290 warnx("WARNING: some events were discarded. Please " 1291 "consider tuning the \"kern.hwpmc.nbuffers\" " 1292 "tunable."); 1293 } 1294 1295 exit(EX_OK); 1296 } 1297