1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 #include <assert.h> 30 #include <dtrace.h> 31 #include <limits.h> 32 #include <link.h> 33 #include <priv.h> 34 #include <signal.h> 35 #include <stdlib.h> 36 #include <stdarg.h> 37 #include <stdio.h> 38 #include <string.h> 39 #include <strings.h> 40 #include <errno.h> 41 #include <sys/wait.h> 42 #include <libgen.h> 43 #include <libproc.h> 44 45 static char *g_pname; 46 static dtrace_hdl_t *g_dtp; 47 struct ps_prochandle *g_pr; 48 49 #define E_SUCCESS 0 50 #define E_ERROR 1 51 #define E_USAGE 2 52 53 /* 54 * For hold times we use a global associative array since for mutexes, in 55 * user-land, it's not invalid to release a sychonization primitive that 56 * another thread acquired; rwlocks require a thread-local associative array 57 * since multiple thread can hold the same lock for reading. Note that we 58 * ignore recursive mutex acquisitions and releases as they don't truly 59 * affect lock contention. 60 */ 61 static const char *g_hold_init = 62 "plockstat$target:::rw-acquire\n" 63 "{\n" 64 " self->rwhold[arg0] = timestamp;\n" 65 "}\n" 66 "plockstat$target:::mutex-acquire\n" 67 "/arg1 == 0/\n" 68 "{\n" 69 " mtxhold[arg0] = timestamp;\n" 70 "}\n"; 71 72 static const char *g_hold_histogram = 73 "plockstat$target:::rw-release\n" 74 "/self->rwhold[arg0] && arg1 == 1/\n" 75 "{\n" 76 " @rw_w_hold[arg0, ustack()] =\n" 77 " quantize(timestamp - self->rwhold[arg0]);\n" 78 " self->rwhold[arg0] = 0;\n" 79 " rw_w_hold_found = 1;\n" 80 "}\n" 81 "plockstat$target:::rw-release\n" 82 "/self->rwhold[arg0]/\n" 83 "{\n" 84 " @rw_r_hold[arg0, ustack()] =\n" 85 " quantize(timestamp - self->rwhold[arg0]);\n" 86 " self->rwhold[arg0] = 0;\n" 87 " rw_r_hold_found = 1;\n" 88 "}\n" 89 "plockstat$target:::mutex-release\n" 90 "/mtxhold[arg0] && arg1 == 0/\n" 91 "{\n" 92 " @mtx_hold[arg0, ustack()] = quantize(timestamp - mtxhold[arg0]);\n" 93 " mtxhold[arg0] = 0;\n" 94 " mtx_hold_found = 1;\n" 95 "}\n" 96 "\n" 97 "END\n" 98 "/mtx_hold_found/\n" 99 "{\n" 100 " trace(\"Mutex hold\");\n" 101 " printa(@mtx_hold);\n" 102 "}\n" 103 "END\n" 104 "/rw_r_hold_found/\n" 105 "{\n" 106 " trace(\"R/W reader hold\");\n" 107 " printa(@rw_r_hold);\n" 108 "}\n" 109 "END\n" 110 "/rw_w_hold_found/\n" 111 "{\n" 112 " trace(\"R/W writer hold\");\n" 113 " printa(@rw_w_hold);\n" 114 "}\n"; 115 116 static const char *g_hold_times = 117 "plockstat$target:::rw-release\n" 118 "/self->rwhold[arg0] && arg1 == 1/\n" 119 "{\n" 120 " @rw_w_hold[arg0, ustack(5)] = sum(timestamp - self->rwhold[arg0]);\n" 121 " @rw_w_hold_count[arg0, ustack(5)] = count();\n" 122 " self->rwhold[arg0] = 0;\n" 123 " rw_w_hold_found = 1;\n" 124 "}\n" 125 "plockstat$target:::rw-release\n" 126 "/self->rwhold[arg0]/\n" 127 "{\n" 128 " @rw_r_hold[arg0, ustack(5)] = sum(timestamp - self->rwhold[arg0]);\n" 129 " @rw_r_hold_count[arg0, ustack(5)] = count();\n" 130 " self->rwhold[arg0] = 0;\n" 131 " rw_r_hold_found = 1;\n" 132 "}\n" 133 "plockstat$target:::mutex-release\n" 134 "/mtxhold[arg0] && arg1 == 0/\n" 135 "{\n" 136 " @mtx_hold[arg0, ustack(5)] = sum(timestamp - mtxhold[arg0]);\n" 137 " @mtx_hold_count[arg0, ustack(5)] = count();\n" 138 " mtxhold[arg0] = 0;\n" 139 " mtx_hold_found = 1;\n" 140 "}\n" 141 "\n" 142 "END\n" 143 "/mtx_hold_found/\n" 144 "{\n" 145 " trace(\"Mutex hold\");\n" 146 " printa(@mtx_hold, @mtx_hold_count);\n" 147 "}\n" 148 "END\n" 149 "/rw_r_hold_found/\n" 150 "{\n" 151 " trace(\"R/W reader hold\");\n" 152 " printa(@rw_r_hold, @rw_r_hold_count);\n" 153 "}\n" 154 "END\n" 155 "/rw_w_hold_found/\n" 156 "{\n" 157 " trace(\"R/W writer hold\");\n" 158 " printa(@rw_w_hold, @rw_w_hold_count);\n" 159 "}\n"; 160 161 162 /* 163 * For contention, we use thread-local associative arrays since we're tracing 164 * a single thread's activity in libc and multiple threads can be blocking or 165 * spinning on the same sychonization primitive. 166 */ 167 static const char *g_ctnd_init = 168 "plockstat$target:::rw-block\n" 169 "{\n" 170 " self->rwblock[arg0] = timestamp;\n" 171 "}\n" 172 "plockstat$target:::mutex-block\n" 173 "{\n" 174 " self->mtxblock[arg0] = timestamp;\n" 175 "}\n" 176 "plockstat$target:::mutex-spin\n" 177 "{\n" 178 " self->mtxspin[arg0] = timestamp;\n" 179 "}\n"; 180 181 static const char *g_ctnd_histogram = 182 "plockstat$target:::rw-blocked\n" 183 "/self->rwblock[arg0] && arg1 == 1 && arg2 != 0/\n" 184 "{\n" 185 " @rw_w_block[arg0, ustack()] =\n" 186 " quantize(timestamp - self->rwblock[arg0]);\n" 187 " self->rwblock[arg0] = 0;\n" 188 " rw_w_block_found = 1;\n" 189 "}\n" 190 "plockstat$target:::rw-blocked\n" 191 "/self->rwblock[arg0] && arg2 != 0/\n" 192 "{\n" 193 " @rw_r_block[arg0, ustack()] =\n" 194 " quantize(timestamp - self->rwblock[arg0]);\n" 195 " self->rwblock[arg0] = 0;\n" 196 " rw_r_block_found = 1;\n" 197 "}\n" 198 "plockstat$target:::rw-blocked\n" 199 "/self->rwblock[arg0]/\n" 200 "{\n" 201 " self->rwblock[arg0] = 0;\n" 202 "}\n" 203 "plockstat$target:::mutex-spun\n" 204 "/self->mtxspin[arg0] && arg1 != 0/\n" 205 "{\n" 206 " @mtx_spin[arg0, ustack()] =\n" 207 " quantize(timestamp - self->mtxspin[arg0]);\n" 208 " self->mtxspin[arg0] = 0;\n" 209 " mtx_spin_found = 1;\n" 210 "}\n" 211 "plockstat$target:::mutex-spun\n" 212 "/self->mtxspin[arg0]/\n" 213 "{\n" 214 " @mtx_vain_spin[arg0, ustack()] =\n" 215 " quantize(timestamp - self->mtxspin[arg0]);\n" 216 " self->mtxspin[arg0] = 0;\n" 217 " mtx_vain_spin_found = 1;\n" 218 "}\n" 219 "plockstat$target:::mutex-blocked\n" 220 "/self->mtxblock[arg0] && arg1 != 0/\n" 221 "{\n" 222 " @mtx_block[arg0, ustack()] =\n" 223 " quantize(timestamp - self->mtxblock[arg0]);\n" 224 " self->mtxblock[arg0] = 0;\n" 225 " mtx_block_found = 1;\n" 226 "}\n" 227 "plockstat$target:::mutex-blocked\n" 228 "/self->mtxblock[arg0]/\n" 229 "{\n" 230 " self->mtxblock[arg0] = 0;\n" 231 "}\n" 232 "\n" 233 "END\n" 234 "/mtx_block_found/\n" 235 "{\n" 236 " trace(\"Mutex block\");\n" 237 " printa(@mtx_block);\n" 238 "}\n" 239 "END\n" 240 "/mtx_spin_found/\n" 241 "{\n" 242 " trace(\"Mutex spin\");\n" 243 " printa(@mtx_spin);\n" 244 "}\n" 245 "END\n" 246 "/mtx_vain_spin_found/\n" 247 "{\n" 248 " trace(\"Mutex unsuccessful spin\");\n" 249 " printa(@mtx_vain_spin);\n" 250 "}\n" 251 "END\n" 252 "/rw_r_block_found/\n" 253 "{\n" 254 " trace(\"R/W reader block\");\n" 255 " printa(@rw_r_block);\n" 256 "}\n" 257 "END\n" 258 "/rw_w_block_found/\n" 259 "{\n" 260 " trace(\"R/W writer block\");\n" 261 " printa(@rw_w_block);\n" 262 "}\n"; 263 264 265 static const char *g_ctnd_times = 266 "plockstat$target:::rw-blocked\n" 267 "/self->rwblock[arg0] && arg1 == 1 && arg2 != 0/\n" 268 "{\n" 269 " @rw_w_block[arg0, ustack(5)] =\n" 270 " sum(timestamp - self->rwblock[arg0]);\n" 271 " @rw_w_block_count[arg0, ustack(5)] = count();\n" 272 " self->rwblock[arg0] = 0;\n" 273 " rw_w_block_found = 1;\n" 274 "}\n" 275 "plockstat$target:::rw-blocked\n" 276 "/self->rwblock[arg0] && arg2 != 0/\n" 277 "{\n" 278 " @rw_r_block[arg0, ustack(5)] =\n" 279 " sum(timestamp - self->rwblock[arg0]);\n" 280 " @rw_r_block_count[arg0, ustack(5)] = count();\n" 281 " self->rwblock[arg0] = 0;\n" 282 " rw_r_block_found = 1;\n" 283 "}\n" 284 "plockstat$target:::rw-blocked\n" 285 "/self->rwblock[arg0]/\n" 286 "{\n" 287 " self->rwblock[arg0] = 0;\n" 288 "}\n" 289 "plockstat$target:::mutex-spun\n" 290 "/self->mtxspin[arg0] && arg1 != 0/\n" 291 "{\n" 292 " @mtx_spin[arg0, ustack(5)] =\n" 293 " sum(timestamp - self->mtxspin[arg0]);\n" 294 " @mtx_spin_count[arg0, ustack(5)] = count();\n" 295 " self->mtxspin[arg0] = 0;\n" 296 " mtx_spin_found = 1;\n" 297 "}\n" 298 "plockstat$target:::mutex-spun\n" 299 "/self->mtxspin[arg0]/\n" 300 "{\n" 301 " @mtx_vain_spin[arg0, ustack(5)] =\n" 302 " sum(timestamp - self->mtxspin[arg0]);\n" 303 " @mtx_vain_spin_count[arg0, ustack(5)] = count();\n" 304 " self->mtxspin[arg0] = 0;\n" 305 " mtx_vain_spin_found = 1;\n" 306 "}\n" 307 "plockstat$target:::mutex-blocked\n" 308 "/self->mtxblock[arg0] && arg1 != 0/\n" 309 "{\n" 310 " @mtx_block[arg0, ustack(5)] =\n" 311 " sum(timestamp - self->mtxblock[arg0]);\n" 312 " @mtx_block_count[arg0, ustack(5)] = count();\n" 313 " self->mtxblock[arg0] = 0;\n" 314 " mtx_block_found = 1;\n" 315 "}\n" 316 "plockstat$target:::mutex-blocked\n" 317 "/self->mtxblock[arg0]/\n" 318 "{\n" 319 " self->mtxblock[arg0] = 0;\n" 320 "}\n" 321 "\n" 322 "END\n" 323 "/mtx_block_found/\n" 324 "{\n" 325 " trace(\"Mutex block\");\n" 326 " printa(@mtx_block, @mtx_block_count);\n" 327 "}\n" 328 "END\n" 329 "/mtx_spin_found/\n" 330 "{\n" 331 " trace(\"Mutex spin\");\n" 332 " printa(@mtx_spin, @mtx_spin_count);\n" 333 "}\n" 334 "END\n" 335 "/mtx_vain_spin_found/\n" 336 "{\n" 337 " trace(\"Mutex unsuccessful spin\");\n" 338 " printa(@mtx_vain_spin, @mtx_vain_spin_count);\n" 339 "}\n" 340 "END\n" 341 "/rw_r_block_found/\n" 342 "{\n" 343 " trace(\"R/W reader block\");\n" 344 " printa(@rw_r_block, @rw_r_block_count);\n" 345 "}\n" 346 "END\n" 347 "/rw_w_block_found/\n" 348 "{\n" 349 " trace(\"R/W writer block\");\n" 350 " printa(@rw_w_block, @rw_w_block_count);\n" 351 "}\n"; 352 353 static char g_prog[4096]; 354 static size_t g_proglen; 355 static int g_opt_V, g_opt_s; 356 static int g_intr; 357 static int g_exited; 358 static dtrace_optval_t g_nframes; 359 static ulong_t g_nent = ULONG_MAX; 360 361 #define PLOCKSTAT_OPTSTR "n:ps:e:vx:ACHV" 362 363 static void 364 usage(void) 365 { 366 (void) fprintf(stderr, "Usage:\n" 367 "\t%s [-vACHV] [-n count] [-s depth] [-e secs] [-x opt[=val]]\n" 368 "\t command [arg...]\n" 369 "\t%s [-vACHV] [-n count] [-s depth] [-e secs] [-x opt[=val]]\n" 370 "\t -p pid\n", g_pname, g_pname); 371 372 exit(E_USAGE); 373 } 374 375 static void 376 verror(const char *fmt, va_list ap) 377 { 378 int error = errno; 379 380 (void) fprintf(stderr, "%s: ", g_pname); 381 (void) vfprintf(stderr, fmt, ap); 382 383 if (fmt[strlen(fmt) - 1] != '\n') 384 (void) fprintf(stderr, ": %s\n", strerror(error)); 385 } 386 387 /*PRINTFLIKE1*/ 388 static void 389 fatal(const char *fmt, ...) 390 { 391 va_list ap; 392 393 va_start(ap, fmt); 394 verror(fmt, ap); 395 va_end(ap); 396 397 if (g_pr != NULL && g_dtp != NULL) 398 dtrace_proc_release(g_dtp, g_pr); 399 400 exit(E_ERROR); 401 } 402 403 /*PRINTFLIKE1*/ 404 static void 405 dfatal(const char *fmt, ...) 406 { 407 va_list ap; 408 409 va_start(ap, fmt); 410 411 (void) fprintf(stderr, "%s: ", g_pname); 412 if (fmt != NULL) 413 (void) vfprintf(stderr, fmt, ap); 414 415 va_end(ap); 416 417 if (fmt != NULL && fmt[strlen(fmt) - 1] != '\n') { 418 (void) fprintf(stderr, ": %s\n", 419 dtrace_errmsg(g_dtp, dtrace_errno(g_dtp))); 420 } else if (fmt == NULL) { 421 (void) fprintf(stderr, "%s\n", 422 dtrace_errmsg(g_dtp, dtrace_errno(g_dtp))); 423 } 424 425 if (g_pr != NULL) { 426 dtrace_proc_continue(g_dtp, g_pr); 427 dtrace_proc_release(g_dtp, g_pr); 428 } 429 430 exit(E_ERROR); 431 } 432 433 /*PRINTFLIKE1*/ 434 static void 435 notice(const char *fmt, ...) 436 { 437 va_list ap; 438 439 va_start(ap, fmt); 440 verror(fmt, ap); 441 va_end(ap); 442 } 443 444 static void 445 dprog_add(const char *prog) 446 { 447 size_t len = strlen(prog); 448 bcopy(prog, g_prog + g_proglen, len + 1); 449 g_proglen += len; 450 assert(g_proglen < sizeof (g_prog)); 451 } 452 453 static void 454 dprog_compile(void) 455 { 456 dtrace_prog_t *prog; 457 dtrace_proginfo_t info; 458 459 if (g_opt_V) { 460 (void) fprintf(stderr, "%s: vvvv D program vvvv\n", g_pname); 461 (void) fputs(g_prog, stderr); 462 (void) fprintf(stderr, "%s: ^^^^ D program ^^^^\n", g_pname); 463 } 464 465 if ((prog = dtrace_program_strcompile(g_dtp, g_prog, 466 DTRACE_PROBESPEC_NAME, 0, 0, NULL)) == NULL) 467 dfatal("failed to compile program"); 468 469 if (dtrace_program_exec(g_dtp, prog, &info) == -1) 470 dfatal("failed to enable probes"); 471 } 472 473 void 474 print_legend(void) 475 { 476 (void) printf("%5s %8s %-28s %s\n", "Count", "nsec", "Lock", "Caller"); 477 } 478 479 void 480 print_bar(void) 481 { 482 (void) printf("---------------------------------------" 483 "----------------------------------------\n"); 484 } 485 486 void 487 print_histogram_header(void) 488 { 489 (void) printf("\n%10s ---- Time Distribution --- %5s %s\n", 490 "nsec", "count", "Stack"); 491 } 492 493 /* 494 * Convert an address to a symbolic string or a numeric string. If nolocks 495 * is set, we return an error code if this symbol appears to be a mutex- or 496 * rwlock-related symbol in libc so the caller has a chance to find a more 497 * helpful symbol. 498 */ 499 static int 500 getsym(struct ps_prochandle *P, uintptr_t addr, char *buf, size_t size, 501 int nolocks) 502 { 503 char name[256]; 504 GElf_Sym sym; 505 prsyminfo_t info; 506 size_t len; 507 508 if (P == NULL || Pxlookup_by_addr(P, addr, name, sizeof (name), 509 &sym, &info) != 0) { 510 (void) snprintf(buf, size, "%#lx", addr); 511 return (0); 512 } 513 514 if (info.prs_lmid != LM_ID_BASE) { 515 len = snprintf(buf, size, "LM%lu`", info.prs_lmid); 516 buf += len; 517 size -= len; 518 } 519 520 len = snprintf(buf, size, "%s`%s", info.prs_object, info.prs_name); 521 buf += len; 522 size -= len; 523 524 if (sym.st_value != addr) 525 len = snprintf(buf, size, "+%#lx", addr - sym.st_value); 526 527 if (nolocks && strcmp("libc.so.1", info.prs_object) == 0 && 528 (strstr("mutex", info.prs_name) == 0 || 529 strstr("rw", info.prs_name) == 0)) 530 return (-1); 531 532 return (0); 533 } 534 535 /*ARGSUSED*/ 536 static int 537 process_aggregate(const dtrace_aggdata_t **aggsdata, int naggvars, void *arg) 538 { 539 const dtrace_recdesc_t *rec; 540 uintptr_t lock; 541 uint64_t *stack; 542 caddr_t data; 543 pid_t pid; 544 struct ps_prochandle *P; 545 char buf[256]; 546 int i, j; 547 uint64_t sum, count, avg; 548 549 if ((*(uint_t *)arg)++ >= g_nent) 550 return (DTRACE_AGGWALK_NEXT); 551 552 rec = aggsdata[0]->dtada_desc->dtagd_rec; 553 data = aggsdata[0]->dtada_data; 554 555 /*LINTED - alignment*/ 556 lock = (uintptr_t)*(uint64_t *)(data + rec[1].dtrd_offset); 557 /*LINTED - alignment*/ 558 stack = (uint64_t *)(data + rec[2].dtrd_offset); 559 560 if (!g_opt_s) { 561 /*LINTED - alignment*/ 562 sum = *(uint64_t *)(aggsdata[1]->dtada_data + 563 aggsdata[1]->dtada_desc->dtagd_rec[3].dtrd_offset); 564 /*LINTED - alignment*/ 565 count = *(uint64_t *)(aggsdata[2]->dtada_data + 566 aggsdata[2]->dtada_desc->dtagd_rec[3].dtrd_offset); 567 } else { 568 uint64_t *a; 569 570 /*LINTED - alignment*/ 571 a = (uint64_t *)(aggsdata[1]->dtada_data + 572 aggsdata[1]->dtada_desc->dtagd_rec[3].dtrd_offset); 573 574 print_bar(); 575 print_legend(); 576 577 for (count = sum = 0, i = DTRACE_QUANTIZE_ZEROBUCKET, j = 0; 578 i < DTRACE_QUANTIZE_NBUCKETS; i++, j++) { 579 count += a[i]; 580 sum += a[i] << (j - 64); 581 } 582 } 583 584 avg = sum / count; 585 (void) printf("%5llu %8llu ", (u_longlong_t)count, (u_longlong_t)avg); 586 587 pid = stack[0]; 588 P = dtrace_proc_grab(g_dtp, pid, PGRAB_RDONLY); 589 590 (void) getsym(P, lock, buf, sizeof (buf), 0); 591 (void) printf("%-28s ", buf); 592 593 for (i = 2; i <= 5; i++) { 594 if (getsym(P, stack[i], buf, sizeof (buf), 1) == 0) 595 break; 596 } 597 (void) printf("%s\n", buf); 598 599 if (g_opt_s) { 600 int stack_done = 0; 601 int quant_done = 0; 602 int first_bin, last_bin; 603 uint64_t bin_size, *a; 604 605 /*LINTED - alignment*/ 606 a = (uint64_t *)(aggsdata[1]->dtada_data + 607 aggsdata[1]->dtada_desc->dtagd_rec[3].dtrd_offset); 608 609 print_histogram_header(); 610 611 for (first_bin = DTRACE_QUANTIZE_ZEROBUCKET; 612 a[first_bin] == 0; first_bin++) 613 continue; 614 for (last_bin = DTRACE_QUANTIZE_ZEROBUCKET + 63; 615 a[last_bin] == 0; last_bin--) 616 continue; 617 618 for (i = 0; !stack_done || !quant_done; i++) { 619 if (!stack_done) { 620 (void) getsym(P, stack[i + 2], buf, 621 sizeof (buf), 0); 622 } else { 623 buf[0] = '\0'; 624 } 625 626 if (!quant_done) { 627 bin_size = a[first_bin]; 628 629 (void) printf("%10llu |%-24.*s| %5llu %s\n", 630 1ULL << 631 (first_bin - DTRACE_QUANTIZE_ZEROBUCKET), 632 (int)(24.0 * bin_size / count), 633 "@@@@@@@@@@@@@@@@@@@@@@@@@@", 634 (u_longlong_t)bin_size, buf); 635 } else { 636 (void) printf("%43s %s\n", "", buf); 637 } 638 639 if (i + 1 >= g_nframes || stack[i + 3] == 0) 640 stack_done = 1; 641 642 if (first_bin++ == last_bin) 643 quant_done = 1; 644 } 645 } 646 647 dtrace_proc_release(g_dtp, P); 648 649 return (DTRACE_AGGWALK_NEXT); 650 } 651 652 /*ARGSUSED*/ 653 static void 654 prochandler(struct ps_prochandle *P, const char *msg, void *arg) 655 { 656 const psinfo_t *prp = Ppsinfo(P); 657 int pid = Pstatus(P)->pr_pid; 658 char name[SIG2STR_MAX]; 659 660 if (msg != NULL) { 661 notice("pid %d: %s\n", pid, msg); 662 return; 663 } 664 665 switch (Pstate(P)) { 666 case PS_UNDEAD: 667 /* 668 * Ideally we would like to always report pr_wstat here, but it 669 * isn't possible given current /proc semantics. If we grabbed 670 * the process, Ppsinfo() will either fail or return a zeroed 671 * psinfo_t depending on how far the parent is in reaping it. 672 * When /proc provides a stable pr_wstat in the status file, 673 * this code can be improved by examining this new pr_wstat. 674 */ 675 if (prp != NULL && WIFSIGNALED(prp->pr_wstat)) { 676 notice("pid %d terminated by %s\n", pid, 677 proc_signame(WTERMSIG(prp->pr_wstat), 678 name, sizeof (name))); 679 } else if (prp != NULL && WEXITSTATUS(prp->pr_wstat) != 0) { 680 notice("pid %d exited with status %d\n", 681 pid, WEXITSTATUS(prp->pr_wstat)); 682 } else { 683 notice("pid %d has exited\n", pid); 684 } 685 g_exited = 1; 686 break; 687 688 case PS_LOST: 689 notice("pid %d exec'd a set-id or unobservable program\n", pid); 690 g_exited = 1; 691 break; 692 } 693 } 694 695 /*ARGSUSED*/ 696 static int 697 chewrec(const dtrace_probedata_t *data, const dtrace_recdesc_t *rec, void *arg) 698 { 699 dtrace_eprobedesc_t *epd = data->dtpda_edesc; 700 dtrace_aggvarid_t aggvars[2]; 701 const void *buf; 702 int i, nagv; 703 704 /* 705 * A NULL rec indicates that we've processed the last record. 706 */ 707 if (rec == NULL) 708 return (DTRACE_CONSUME_NEXT); 709 710 buf = data->dtpda_data - rec->dtrd_offset; 711 712 switch (rec->dtrd_action) { 713 case DTRACEACT_DIFEXPR: 714 (void) printf("\n%s\n\n", (char *)buf + rec->dtrd_offset); 715 if (!g_opt_s) { 716 print_legend(); 717 print_bar(); 718 } 719 return (DTRACE_CONSUME_NEXT); 720 721 case DTRACEACT_PRINTA: 722 for (nagv = 0, i = 0; i < epd->dtepd_nrecs - 1; i++) { 723 const dtrace_recdesc_t *nrec = &rec[i]; 724 725 if (nrec->dtrd_uarg != rec->dtrd_uarg) 726 break; 727 728 /*LINTED - alignment*/ 729 aggvars[nagv++] = *(dtrace_aggvarid_t *)((caddr_t)buf + 730 nrec->dtrd_offset); 731 } 732 733 if (nagv == (g_opt_s ? 1 : 2)) { 734 uint_t nent = 0; 735 if (dtrace_aggregate_walk_joined(g_dtp, aggvars, nagv, 736 process_aggregate, &nent) != 0) 737 dfatal("failed to walk aggregate"); 738 } 739 740 return (DTRACE_CONSUME_NEXT); 741 } 742 743 return (DTRACE_CONSUME_THIS); 744 } 745 746 /*ARGSUSED*/ 747 static void 748 intr(int signo) 749 { 750 g_intr = 1; 751 } 752 753 int 754 main(int argc, char **argv) 755 { 756 ucred_t *ucp; 757 int err; 758 int opt_C = 0, opt_H = 0, opt_p = 0, opt_v = 0; 759 char c, *p, *end; 760 struct sigaction act; 761 int done = 0; 762 763 g_pname = basename(argv[0]); 764 argv[0] = g_pname; /* rewrite argv[0] for getopt errors */ 765 766 /* 767 * Make sure we have the required dtrace_proc privilege. 768 */ 769 if ((ucp = ucred_get(getpid())) != NULL) { 770 const priv_set_t *psp; 771 if ((psp = ucred_getprivset(ucp, PRIV_EFFECTIVE)) != NULL && 772 !priv_ismember(psp, PRIV_DTRACE_PROC)) { 773 fatal("dtrace_proc privilege required\n"); 774 } 775 776 ucred_free(ucp); 777 } 778 779 while ((c = getopt(argc, argv, PLOCKSTAT_OPTSTR)) != EOF) { 780 switch (c) { 781 case 'n': 782 errno = 0; 783 g_nent = strtoul(optarg, &end, 10); 784 if (*end != '\0' || errno != 0) { 785 (void) fprintf(stderr, "%s: invalid count " 786 "'%s'\n", g_pname, optarg); 787 usage(); 788 } 789 break; 790 791 case 'p': 792 opt_p = 1; 793 break; 794 795 case 'v': 796 opt_v = 1; 797 break; 798 799 case 'A': 800 opt_C = opt_H = 1; 801 break; 802 803 case 'C': 804 opt_C = 1; 805 break; 806 807 case 'H': 808 opt_H = 1; 809 break; 810 811 case 'V': 812 g_opt_V = 1; 813 break; 814 815 default: 816 if (strchr(PLOCKSTAT_OPTSTR, c) == NULL) 817 usage(); 818 } 819 } 820 821 /* 822 * We need a command or at least one pid. 823 */ 824 if (argc == optind) 825 usage(); 826 827 if (opt_C == 0 && opt_H == 0) 828 opt_C = 1; 829 830 if ((g_dtp = dtrace_open(DTRACE_VERSION, 0, &err)) == NULL) 831 fatal("failed to initialize dtrace: %s\n", 832 dtrace_errmsg(NULL, err)); 833 834 /* 835 * The longest string we trace is 23 bytes long -- so 32 is plenty. 836 */ 837 if (dtrace_setopt(g_dtp, "strsize", "32") == -1) 838 dfatal("failed to set 'strsize'"); 839 840 /* 841 * 1k should be more than enough for all trace() and printa() actions. 842 */ 843 if (dtrace_setopt(g_dtp, "bufsize", "1k") == -1) 844 dfatal("failed to set 'bufsize'"); 845 846 /* 847 * The table we produce has the hottest locks at the top. 848 */ 849 if (dtrace_setopt(g_dtp, "aggsortrev", NULL) == -1) 850 dfatal("failed to set 'aggsortrev'"); 851 852 /* 853 * These are two reasonable defaults which should suffice. 854 */ 855 if (dtrace_setopt(g_dtp, "aggsize", "256k") == -1) 856 dfatal("failed to set 'aggsize'"); 857 if (dtrace_setopt(g_dtp, "aggrate", "1sec") == -1) 858 dfatal("failed to set 'aggrate'"); 859 860 /* 861 * Take a second pass through to look for options that set options now 862 * that we have an open dtrace handle. 863 */ 864 optind = 1; 865 while ((c = getopt(argc, argv, PLOCKSTAT_OPTSTR)) != EOF) { 866 switch (c) { 867 case 's': 868 g_opt_s = 1; 869 if (dtrace_setopt(g_dtp, "ustackframes", optarg) == -1) 870 dfatal("failed to set 'ustackframes'"); 871 break; 872 873 case 'x': 874 if ((p = strchr(optarg, '=')) != NULL) 875 *p++ = '\0'; 876 877 if (dtrace_setopt(g_dtp, optarg, p) != 0) 878 dfatal("failed to set -x %s", optarg); 879 break; 880 881 case 'e': 882 errno = 0; 883 (void) strtoul(optarg, &end, 10); 884 if (*optarg == '-' || *end != '\0' || errno != 0) { 885 (void) fprintf(stderr, "%s: invalid timeout " 886 "'%s'\n", g_pname, optarg); 887 usage(); 888 } 889 890 /* 891 * Construct a DTrace enabling that will exit after 892 * the specified number of seconds. 893 */ 894 dprog_add("BEGIN\n{\n\tend = timestamp + "); 895 dprog_add(optarg); 896 dprog_add(" * 1000000000;\n}\n"); 897 dprog_add("tick-10hz\n/timestamp >= end/\n"); 898 dprog_add("{\n\texit(0);\n}\n"); 899 break; 900 } 901 } 902 903 argc -= optind; 904 argv += optind; 905 906 if (opt_H) { 907 dprog_add(g_hold_init); 908 if (g_opt_s == NULL) 909 dprog_add(g_hold_times); 910 else 911 dprog_add(g_hold_histogram); 912 } 913 914 if (opt_C) { 915 dprog_add(g_ctnd_init); 916 if (g_opt_s == NULL) 917 dprog_add(g_ctnd_times); 918 else 919 dprog_add(g_ctnd_histogram); 920 } 921 922 if (opt_p) { 923 ulong_t pid; 924 925 if (argc > 1) { 926 (void) fprintf(stderr, "%s: only one pid is allowed\n", 927 g_pname); 928 usage(); 929 } 930 931 errno = 0; 932 pid = strtoul(argv[0], &end, 10); 933 if (*end != '\0' || errno != 0 || (pid_t)pid != pid) { 934 (void) fprintf(stderr, "%s: invalid pid '%s'\n", 935 g_pname, argv[0]); 936 usage(); 937 } 938 939 if ((g_pr = dtrace_proc_grab(g_dtp, (pid_t)pid, 0)) == NULL) 940 dfatal(NULL); 941 } else { 942 if ((g_pr = dtrace_proc_create(g_dtp, argv[0], argv)) == NULL) 943 dfatal(NULL); 944 } 945 946 dprog_compile(); 947 948 if (dtrace_handle_proc(g_dtp, &prochandler, NULL) == -1) 949 dfatal("failed to establish proc handler"); 950 951 (void) sigemptyset(&act.sa_mask); 952 act.sa_flags = 0; 953 act.sa_handler = intr; 954 (void) sigaction(SIGINT, &act, NULL); 955 (void) sigaction(SIGTERM, &act, NULL); 956 957 if (dtrace_go(g_dtp) != 0) 958 dfatal("dtrace_go()"); 959 960 if (dtrace_getopt(g_dtp, "ustackframes", &g_nframes) != 0) 961 dfatal("failed to get 'ustackframes'"); 962 963 dtrace_proc_continue(g_dtp, g_pr); 964 965 if (opt_v) 966 (void) printf("%s: tracing enabled for pid %d\n", g_pname, 967 (int)Pstatus(g_pr)->pr_pid); 968 969 do { 970 if (!g_intr && !done) 971 dtrace_sleep(g_dtp); 972 973 if (done || g_intr || g_exited) { 974 done = 1; 975 if (dtrace_stop(g_dtp) == -1) 976 dfatal("couldn't stop tracing"); 977 } 978 979 switch (dtrace_work(g_dtp, stdout, NULL, chewrec, NULL)) { 980 case DTRACE_WORKSTATUS_DONE: 981 done = 1; 982 break; 983 case DTRACE_WORKSTATUS_OKAY: 984 break; 985 default: 986 dfatal("processing aborted"); 987 } 988 989 } while (!done); 990 991 dtrace_close(g_dtp); 992 993 return (0); 994 } 995