1 /*- 2 * Copyright (c) 2006 John Baldwin <jhb@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the author nor the names of any co-contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 /* 31 * This module holds the global variables and functions used to maintain 32 * lock_object structures. 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include "opt_ddb.h" 39 #include "opt_mprof.h" 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/kernel.h> 44 #include <sys/ktr.h> 45 #include <sys/linker_set.h> 46 #include <sys/lock.h> 47 #include <sys/lock_profile.h> 48 #include <sys/malloc.h> 49 #include <sys/mutex.h> 50 #include <sys/pcpu.h> 51 #include <sys/proc.h> 52 #include <sys/sbuf.h> 53 #include <sys/sched.h> 54 #include <sys/smp.h> 55 #include <sys/sysctl.h> 56 57 #ifdef DDB 58 #include <ddb/ddb.h> 59 #endif 60 61 #include <machine/cpufunc.h> 62 63 CTASSERT(LOCK_CLASS_MAX == 15); 64 65 struct lock_class *lock_classes[LOCK_CLASS_MAX + 1] = { 66 &lock_class_mtx_spin, 67 &lock_class_mtx_sleep, 68 &lock_class_sx, 69 &lock_class_rm, 70 &lock_class_rw, 71 &lock_class_lockmgr, 72 }; 73 74 void 75 lock_init(struct lock_object *lock, struct lock_class *class, const char *name, 76 const char *type, int flags) 77 { 78 int i; 79 80 /* Check for double-init and zero object. */ 81 KASSERT(!lock_initalized(lock), ("lock \"%s\" %p already initialized", 82 name, lock)); 83 84 /* Look up lock class to find its index. */ 85 for (i = 0; i < LOCK_CLASS_MAX; i++) 86 if (lock_classes[i] == class) { 87 lock->lo_flags = i << LO_CLASSSHIFT; 88 break; 89 } 90 KASSERT(i < LOCK_CLASS_MAX, ("unknown lock class %p", class)); 91 92 /* Initialize the lock object. */ 93 lock->lo_name = name; 94 lock->lo_flags |= flags | LO_INITIALIZED; 95 LOCK_LOG_INIT(lock, 0); 96 WITNESS_INIT(lock, (type != NULL) ? type : name); 97 } 98 99 void 100 lock_destroy(struct lock_object *lock) 101 { 102 103 KASSERT(lock_initalized(lock), ("lock %p is not initialized", lock)); 104 WITNESS_DESTROY(lock); 105 LOCK_LOG_DESTROY(lock, 0); 106 lock->lo_flags &= ~LO_INITIALIZED; 107 } 108 109 #ifdef DDB 110 DB_SHOW_COMMAND(lock, db_show_lock) 111 { 112 struct lock_object *lock; 113 struct lock_class *class; 114 115 if (!have_addr) 116 return; 117 lock = (struct lock_object *)addr; 118 if (LO_CLASSINDEX(lock) > LOCK_CLASS_MAX) { 119 db_printf("Unknown lock class: %d\n", LO_CLASSINDEX(lock)); 120 return; 121 } 122 class = LOCK_CLASS(lock); 123 db_printf(" class: %s\n", class->lc_name); 124 db_printf(" name: %s\n", lock->lo_name); 125 class->lc_ddb_show(lock); 126 } 127 #endif 128 129 #ifdef LOCK_PROFILING 130 131 /* 132 * One object per-thread for each lock the thread owns. Tracks individual 133 * lock instances. 134 */ 135 struct lock_profile_object { 136 LIST_ENTRY(lock_profile_object) lpo_link; 137 struct lock_object *lpo_obj; 138 const char *lpo_file; 139 int lpo_line; 140 uint16_t lpo_ref; 141 uint16_t lpo_cnt; 142 uint64_t lpo_acqtime; 143 uint64_t lpo_waittime; 144 u_int lpo_contest_locking; 145 }; 146 147 /* 148 * One lock_prof for each (file, line, lock object) triple. 149 */ 150 struct lock_prof { 151 SLIST_ENTRY(lock_prof) link; 152 struct lock_class *class; 153 const char *file; 154 const char *name; 155 int line; 156 int ticks; 157 uintmax_t cnt_wait_max; 158 uintmax_t cnt_max; 159 uintmax_t cnt_tot; 160 uintmax_t cnt_wait; 161 uintmax_t cnt_cur; 162 uintmax_t cnt_contest_locking; 163 }; 164 165 SLIST_HEAD(lphead, lock_prof); 166 167 #define LPROF_HASH_SIZE 4096 168 #define LPROF_HASH_MASK (LPROF_HASH_SIZE - 1) 169 #define LPROF_CACHE_SIZE 4096 170 171 /* 172 * Array of objects and profs for each type of object for each cpu. Spinlocks 173 * are handled seperately because a thread may be preempted and acquire a 174 * spinlock while in the lock profiling code of a non-spinlock. In this way 175 * we only need a critical section to protect the per-cpu lists. 176 */ 177 struct lock_prof_type { 178 struct lphead lpt_lpalloc; 179 struct lpohead lpt_lpoalloc; 180 struct lphead lpt_hash[LPROF_HASH_SIZE]; 181 struct lock_prof lpt_prof[LPROF_CACHE_SIZE]; 182 struct lock_profile_object lpt_objs[LPROF_CACHE_SIZE]; 183 }; 184 185 struct lock_prof_cpu { 186 struct lock_prof_type lpc_types[2]; /* One for spin one for other. */ 187 }; 188 189 struct lock_prof_cpu *lp_cpu[MAXCPU]; 190 191 volatile int lock_prof_enable = 0; 192 static volatile int lock_prof_resetting; 193 194 /* SWAG: sbuf size = avg stat. line size * number of locks */ 195 #define LPROF_SBUF_SIZE 256 * 400 196 197 static int lock_prof_rejected; 198 static int lock_prof_skipspin; 199 static int lock_prof_skipcount; 200 201 #ifndef USE_CPU_NANOSECONDS 202 uint64_t 203 nanoseconds(void) 204 { 205 struct bintime bt; 206 uint64_t ns; 207 208 binuptime(&bt); 209 /* From bintime2timespec */ 210 ns = bt.sec * (uint64_t)1000000000; 211 ns += ((uint64_t)1000000000 * (uint32_t)(bt.frac >> 32)) >> 32; 212 return (ns); 213 } 214 #endif 215 216 static void 217 lock_prof_init_type(struct lock_prof_type *type) 218 { 219 int i; 220 221 SLIST_INIT(&type->lpt_lpalloc); 222 LIST_INIT(&type->lpt_lpoalloc); 223 for (i = 0; i < LPROF_CACHE_SIZE; i++) { 224 SLIST_INSERT_HEAD(&type->lpt_lpalloc, &type->lpt_prof[i], 225 link); 226 LIST_INSERT_HEAD(&type->lpt_lpoalloc, &type->lpt_objs[i], 227 lpo_link); 228 } 229 } 230 231 static void 232 lock_prof_init(void *arg) 233 { 234 int cpu; 235 236 for (cpu = 0; cpu <= mp_maxid; cpu++) { 237 lp_cpu[cpu] = malloc(sizeof(*lp_cpu[cpu]), M_DEVBUF, 238 M_WAITOK | M_ZERO); 239 lock_prof_init_type(&lp_cpu[cpu]->lpc_types[0]); 240 lock_prof_init_type(&lp_cpu[cpu]->lpc_types[1]); 241 } 242 } 243 SYSINIT(lockprof, SI_SUB_SMP, SI_ORDER_ANY, lock_prof_init, NULL); 244 245 /* 246 * To be certain that lock profiling has idled on all cpus before we 247 * reset, we schedule the resetting thread on all active cpus. Since 248 * all operations happen within critical sections we can be sure that 249 * it is safe to zero the profiling structures. 250 */ 251 static void 252 lock_prof_idle(void) 253 { 254 struct thread *td; 255 int cpu; 256 257 td = curthread; 258 thread_lock(td); 259 CPU_FOREACH(cpu) { 260 sched_bind(td, cpu); 261 } 262 sched_unbind(td); 263 thread_unlock(td); 264 } 265 266 static void 267 lock_prof_reset_wait(void) 268 { 269 270 /* 271 * Spin relinquishing our cpu so that lock_prof_idle may 272 * run on it. 273 */ 274 while (lock_prof_resetting) 275 sched_relinquish(curthread); 276 } 277 278 static void 279 lock_prof_reset(void) 280 { 281 struct lock_prof_cpu *lpc; 282 int enabled, i, cpu; 283 284 /* 285 * We not only race with acquiring and releasing locks but also 286 * thread exit. To be certain that threads exit without valid head 287 * pointers they must see resetting set before enabled is cleared. 288 * Otherwise a lock may not be removed from a per-thread list due 289 * to disabled being set but not wait for reset() to remove it below. 290 */ 291 atomic_store_rel_int(&lock_prof_resetting, 1); 292 enabled = lock_prof_enable; 293 lock_prof_enable = 0; 294 lock_prof_idle(); 295 /* 296 * Some objects may have migrated between CPUs. Clear all links 297 * before we zero the structures. Some items may still be linked 298 * into per-thread lists as well. 299 */ 300 for (cpu = 0; cpu <= mp_maxid; cpu++) { 301 lpc = lp_cpu[cpu]; 302 for (i = 0; i < LPROF_CACHE_SIZE; i++) { 303 LIST_REMOVE(&lpc->lpc_types[0].lpt_objs[i], lpo_link); 304 LIST_REMOVE(&lpc->lpc_types[1].lpt_objs[i], lpo_link); 305 } 306 } 307 for (cpu = 0; cpu <= mp_maxid; cpu++) { 308 lpc = lp_cpu[cpu]; 309 bzero(lpc, sizeof(*lpc)); 310 lock_prof_init_type(&lpc->lpc_types[0]); 311 lock_prof_init_type(&lpc->lpc_types[1]); 312 } 313 atomic_store_rel_int(&lock_prof_resetting, 0); 314 lock_prof_enable = enabled; 315 } 316 317 static void 318 lock_prof_output(struct lock_prof *lp, struct sbuf *sb) 319 { 320 const char *p; 321 322 for (p = lp->file; p != NULL && strncmp(p, "../", 3) == 0; p += 3); 323 sbuf_printf(sb, 324 "%8ju %9ju %11ju %11ju %11ju %6ju %6ju %2ju %6ju %s:%d (%s:%s)\n", 325 lp->cnt_max / 1000, lp->cnt_wait_max / 1000, lp->cnt_tot / 1000, 326 lp->cnt_wait / 1000, lp->cnt_cur, 327 lp->cnt_cur == 0 ? (uintmax_t)0 : 328 lp->cnt_tot / (lp->cnt_cur * 1000), 329 lp->cnt_cur == 0 ? (uintmax_t)0 : 330 lp->cnt_wait / (lp->cnt_cur * 1000), 331 (uintmax_t)0, lp->cnt_contest_locking, 332 p, lp->line, lp->class->lc_name, lp->name); 333 } 334 335 static void 336 lock_prof_sum(struct lock_prof *match, struct lock_prof *dst, int hash, 337 int spin, int t) 338 { 339 struct lock_prof_type *type; 340 struct lock_prof *l; 341 int cpu; 342 343 dst->file = match->file; 344 dst->line = match->line; 345 dst->class = match->class; 346 dst->name = match->name; 347 348 for (cpu = 0; cpu <= mp_maxid; cpu++) { 349 if (lp_cpu[cpu] == NULL) 350 continue; 351 type = &lp_cpu[cpu]->lpc_types[spin]; 352 SLIST_FOREACH(l, &type->lpt_hash[hash], link) { 353 if (l->ticks == t) 354 continue; 355 if (l->file != match->file || l->line != match->line || 356 l->name != match->name) 357 continue; 358 l->ticks = t; 359 if (l->cnt_max > dst->cnt_max) 360 dst->cnt_max = l->cnt_max; 361 if (l->cnt_wait_max > dst->cnt_wait_max) 362 dst->cnt_wait_max = l->cnt_wait_max; 363 dst->cnt_tot += l->cnt_tot; 364 dst->cnt_wait += l->cnt_wait; 365 dst->cnt_cur += l->cnt_cur; 366 dst->cnt_contest_locking += l->cnt_contest_locking; 367 } 368 } 369 370 } 371 372 static void 373 lock_prof_type_stats(struct lock_prof_type *type, struct sbuf *sb, int spin, 374 int t) 375 { 376 struct lock_prof *l; 377 int i; 378 379 for (i = 0; i < LPROF_HASH_SIZE; ++i) { 380 SLIST_FOREACH(l, &type->lpt_hash[i], link) { 381 struct lock_prof lp = {}; 382 383 if (l->ticks == t) 384 continue; 385 lock_prof_sum(l, &lp, i, spin, t); 386 lock_prof_output(&lp, sb); 387 if (sbuf_overflowed(sb)) 388 return; 389 } 390 } 391 } 392 393 static int 394 dump_lock_prof_stats(SYSCTL_HANDLER_ARGS) 395 { 396 static int multiplier = 1; 397 struct sbuf *sb; 398 int error, cpu, t; 399 int enabled; 400 401 retry_sbufops: 402 sb = sbuf_new(NULL, NULL, LPROF_SBUF_SIZE * multiplier, SBUF_FIXEDLEN); 403 sbuf_printf(sb, "\n%8s %9s %11s %11s %11s %6s %6s %2s %6s %s\n", 404 "max", "wait_max", "total", "wait_total", "count", "avg", "wait_avg", "cnt_hold", "cnt_lock", "name"); 405 enabled = lock_prof_enable; 406 lock_prof_enable = 0; 407 lock_prof_idle(); 408 t = ticks; 409 for (cpu = 0; cpu <= mp_maxid; cpu++) { 410 if (lp_cpu[cpu] == NULL) 411 continue; 412 lock_prof_type_stats(&lp_cpu[cpu]->lpc_types[0], sb, 0, t); 413 lock_prof_type_stats(&lp_cpu[cpu]->lpc_types[1], sb, 1, t); 414 if (sbuf_overflowed(sb)) { 415 sbuf_delete(sb); 416 multiplier++; 417 goto retry_sbufops; 418 } 419 } 420 lock_prof_enable = enabled; 421 422 sbuf_finish(sb); 423 error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1); 424 sbuf_delete(sb); 425 return (error); 426 } 427 428 static int 429 enable_lock_prof(SYSCTL_HANDLER_ARGS) 430 { 431 int error, v; 432 433 v = lock_prof_enable; 434 error = sysctl_handle_int(oidp, &v, v, req); 435 if (error) 436 return (error); 437 if (req->newptr == NULL) 438 return (error); 439 if (v == lock_prof_enable) 440 return (0); 441 if (v == 1) 442 lock_prof_reset(); 443 lock_prof_enable = !!v; 444 445 return (0); 446 } 447 448 static int 449 reset_lock_prof_stats(SYSCTL_HANDLER_ARGS) 450 { 451 int error, v; 452 453 v = 0; 454 error = sysctl_handle_int(oidp, &v, 0, req); 455 if (error) 456 return (error); 457 if (req->newptr == NULL) 458 return (error); 459 if (v == 0) 460 return (0); 461 lock_prof_reset(); 462 463 return (0); 464 } 465 466 static struct lock_prof * 467 lock_profile_lookup(struct lock_object *lo, int spin, const char *file, 468 int line) 469 { 470 const char *unknown = "(unknown)"; 471 struct lock_prof_type *type; 472 struct lock_prof *lp; 473 struct lphead *head; 474 const char *p; 475 u_int hash; 476 477 p = file; 478 if (p == NULL || *p == '\0') 479 p = unknown; 480 hash = (uintptr_t)lo->lo_name * 31 + (uintptr_t)p * 31 + line; 481 hash &= LPROF_HASH_MASK; 482 type = &lp_cpu[PCPU_GET(cpuid)]->lpc_types[spin]; 483 head = &type->lpt_hash[hash]; 484 SLIST_FOREACH(lp, head, link) { 485 if (lp->line == line && lp->file == p && 486 lp->name == lo->lo_name) 487 return (lp); 488 489 } 490 lp = SLIST_FIRST(&type->lpt_lpalloc); 491 if (lp == NULL) { 492 lock_prof_rejected++; 493 return (lp); 494 } 495 SLIST_REMOVE_HEAD(&type->lpt_lpalloc, link); 496 lp->file = p; 497 lp->line = line; 498 lp->class = LOCK_CLASS(lo); 499 lp->name = lo->lo_name; 500 SLIST_INSERT_HEAD(&type->lpt_hash[hash], lp, link); 501 return (lp); 502 } 503 504 static struct lock_profile_object * 505 lock_profile_object_lookup(struct lock_object *lo, int spin, const char *file, 506 int line) 507 { 508 struct lock_profile_object *l; 509 struct lock_prof_type *type; 510 struct lpohead *head; 511 512 head = &curthread->td_lprof[spin]; 513 LIST_FOREACH(l, head, lpo_link) 514 if (l->lpo_obj == lo && l->lpo_file == file && 515 l->lpo_line == line) 516 return (l); 517 type = &lp_cpu[PCPU_GET(cpuid)]->lpc_types[spin]; 518 l = LIST_FIRST(&type->lpt_lpoalloc); 519 if (l == NULL) { 520 lock_prof_rejected++; 521 return (NULL); 522 } 523 LIST_REMOVE(l, lpo_link); 524 l->lpo_obj = lo; 525 l->lpo_file = file; 526 l->lpo_line = line; 527 l->lpo_cnt = 0; 528 LIST_INSERT_HEAD(head, l, lpo_link); 529 530 return (l); 531 } 532 533 void 534 lock_profile_obtain_lock_success(struct lock_object *lo, int contested, 535 uint64_t waittime, const char *file, int line) 536 { 537 static int lock_prof_count; 538 struct lock_profile_object *l; 539 int spin; 540 541 /* don't reset the timer when/if recursing */ 542 if (!lock_prof_enable || (lo->lo_flags & LO_NOPROFILE)) 543 return; 544 if (lock_prof_skipcount && 545 (++lock_prof_count % lock_prof_skipcount) != 0) 546 return; 547 spin = (LOCK_CLASS(lo)->lc_flags & LC_SPINLOCK) ? 1 : 0; 548 if (spin && lock_prof_skipspin == 1) 549 return; 550 critical_enter(); 551 /* Recheck enabled now that we're in a critical section. */ 552 if (lock_prof_enable == 0) 553 goto out; 554 l = lock_profile_object_lookup(lo, spin, file, line); 555 if (l == NULL) 556 goto out; 557 l->lpo_cnt++; 558 if (++l->lpo_ref > 1) 559 goto out; 560 l->lpo_contest_locking = contested; 561 l->lpo_acqtime = nanoseconds(); 562 if (waittime && (l->lpo_acqtime > waittime)) 563 l->lpo_waittime = l->lpo_acqtime - waittime; 564 else 565 l->lpo_waittime = 0; 566 out: 567 critical_exit(); 568 } 569 570 void 571 lock_profile_thread_exit(struct thread *td) 572 { 573 #ifdef INVARIANTS 574 struct lock_profile_object *l; 575 576 MPASS(curthread->td_critnest == 0); 577 #endif 578 /* 579 * If lock profiling was disabled we have to wait for reset to 580 * clear our pointers before we can exit safely. 581 */ 582 lock_prof_reset_wait(); 583 #ifdef INVARIANTS 584 LIST_FOREACH(l, &td->td_lprof[0], lpo_link) 585 printf("thread still holds lock acquired at %s:%d\n", 586 l->lpo_file, l->lpo_line); 587 LIST_FOREACH(l, &td->td_lprof[1], lpo_link) 588 printf("thread still holds lock acquired at %s:%d\n", 589 l->lpo_file, l->lpo_line); 590 #endif 591 MPASS(LIST_FIRST(&td->td_lprof[0]) == NULL); 592 MPASS(LIST_FIRST(&td->td_lprof[1]) == NULL); 593 } 594 595 void 596 lock_profile_release_lock(struct lock_object *lo) 597 { 598 struct lock_profile_object *l; 599 struct lock_prof_type *type; 600 struct lock_prof *lp; 601 uint64_t curtime, holdtime; 602 struct lpohead *head; 603 int spin; 604 605 if (lo->lo_flags & LO_NOPROFILE) 606 return; 607 spin = (LOCK_CLASS(lo)->lc_flags & LC_SPINLOCK) ? 1 : 0; 608 head = &curthread->td_lprof[spin]; 609 if (LIST_FIRST(head) == NULL) 610 return; 611 critical_enter(); 612 /* Recheck enabled now that we're in a critical section. */ 613 if (lock_prof_enable == 0 && lock_prof_resetting == 1) 614 goto out; 615 /* 616 * If lock profiling is not enabled we still want to remove the 617 * lpo from our queue. 618 */ 619 LIST_FOREACH(l, head, lpo_link) 620 if (l->lpo_obj == lo) 621 break; 622 if (l == NULL) 623 goto out; 624 if (--l->lpo_ref > 0) 625 goto out; 626 lp = lock_profile_lookup(lo, spin, l->lpo_file, l->lpo_line); 627 if (lp == NULL) 628 goto release; 629 curtime = nanoseconds(); 630 if (curtime < l->lpo_acqtime) 631 goto release; 632 holdtime = curtime - l->lpo_acqtime; 633 634 /* 635 * Record if the lock has been held longer now than ever 636 * before. 637 */ 638 if (holdtime > lp->cnt_max) 639 lp->cnt_max = holdtime; 640 if (l->lpo_waittime > lp->cnt_wait_max) 641 lp->cnt_wait_max = l->lpo_waittime; 642 lp->cnt_tot += holdtime; 643 lp->cnt_wait += l->lpo_waittime; 644 lp->cnt_contest_locking += l->lpo_contest_locking; 645 lp->cnt_cur += l->lpo_cnt; 646 release: 647 LIST_REMOVE(l, lpo_link); 648 type = &lp_cpu[PCPU_GET(cpuid)]->lpc_types[spin]; 649 LIST_INSERT_HEAD(&type->lpt_lpoalloc, l, lpo_link); 650 out: 651 critical_exit(); 652 } 653 654 SYSCTL_NODE(_debug, OID_AUTO, lock, CTLFLAG_RD, NULL, "lock debugging"); 655 SYSCTL_NODE(_debug_lock, OID_AUTO, prof, CTLFLAG_RD, NULL, "lock profiling"); 656 SYSCTL_INT(_debug_lock_prof, OID_AUTO, skipspin, CTLFLAG_RW, 657 &lock_prof_skipspin, 0, "Skip profiling on spinlocks."); 658 SYSCTL_INT(_debug_lock_prof, OID_AUTO, skipcount, CTLFLAG_RW, 659 &lock_prof_skipcount, 0, "Sample approximately every N lock acquisitions."); 660 SYSCTL_INT(_debug_lock_prof, OID_AUTO, rejected, CTLFLAG_RD, 661 &lock_prof_rejected, 0, "Number of rejected profiling records"); 662 SYSCTL_PROC(_debug_lock_prof, OID_AUTO, stats, CTLTYPE_STRING | CTLFLAG_RD, 663 NULL, 0, dump_lock_prof_stats, "A", "Lock profiling statistics"); 664 SYSCTL_PROC(_debug_lock_prof, OID_AUTO, reset, CTLTYPE_INT | CTLFLAG_RW, 665 NULL, 0, reset_lock_prof_stats, "I", "Reset lock profiling statistics"); 666 SYSCTL_PROC(_debug_lock_prof, OID_AUTO, enable, CTLTYPE_INT | CTLFLAG_RW, 667 NULL, 0, enable_lock_prof, "I", "Enable lock profiling"); 668 669 #endif 670