1 /* 2 * Copyright (c) 2005 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by Matthew Dillon <dillon@backplane.com> 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * 3. Neither the name of The DragonFly Project nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific, prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 /* 35 * The following copyright applies to the DDB command code: 36 * 37 * Copyright (c) 2000 John Baldwin <jhb@FreeBSD.org> 38 * All rights reserved. 39 * 40 * Redistribution and use in source and binary forms, with or without 41 * modification, are permitted provided that the following conditions 42 * are met: 43 * 1. Redistributions of source code must retain the above copyright 44 * notice, this list of conditions and the following disclaimer. 45 * 2. Redistributions in binary form must reproduce the above copyright 46 * notice, this list of conditions and the following disclaimer in the 47 * documentation and/or other materials provided with the distribution. 48 * 3. Neither the name of the author nor the names of any co-contributors 49 * may be used to endorse or promote products derived from this software 50 * without specific prior written permission. 51 * 52 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 53 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 54 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 55 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 56 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 57 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 58 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 59 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 60 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 61 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 62 * SUCH DAMAGE. 63 */ 64 65 /* 66 * Kernel tracepoint facility. 67 */ 68 69 #include "opt_ddb.h" 70 #include "opt_ktr.h" 71 72 #include <sys/param.h> 73 #include <sys/cons.h> 74 #include <sys/kernel.h> 75 #include <sys/libkern.h> 76 #include <sys/proc.h> 77 #include <sys/sysctl.h> 78 #include <sys/ktr.h> 79 #include <sys/systm.h> 80 #include <sys/time.h> 81 #include <sys/malloc.h> 82 #include <sys/spinlock.h> 83 #include <sys/thread2.h> 84 #include <sys/spinlock2.h> 85 #include <sys/ctype.h> 86 87 #include <machine/cpu.h> 88 #include <machine/cpufunc.h> 89 #include <machine/specialreg.h> 90 #include <machine/md_var.h> 91 92 #include <ddb/ddb.h> 93 94 #ifndef KTR_ENTRIES 95 #define KTR_ENTRIES 2048 96 #elif (KTR_ENTRIES & KTR_ENTRIES - 1) 97 #error KTR_ENTRIES must be a power of two 98 #endif 99 #define KTR_ENTRIES_MASK (KTR_ENTRIES - 1) 100 101 /* 102 * Used by earlier boot; default value consumes ~64K BSS. 103 * 104 * NOTE: 105 * We use a small value here; this prevents kernel or module loading 106 * failure due to excessive BSS usage if KTR_ENTRIES is large. 107 */ 108 #if (KTR_ENTRIES < 256) 109 #define KTR_ENTRIES_BOOT0 KTR_ENTRIES 110 #else 111 #define KTR_ENTRIES_BOOT0 256 112 #endif 113 #define KTR_ENTRIES_BOOT0_MASK (KTR_ENTRIES_BOOT0 - 1) 114 115 /* 116 * test logging support. When ktr_testlogcnt is non-zero each synchronization 117 * interrupt will issue six back-to-back ktr logging messages on cpu 0 118 * so the user can determine KTR logging overheads. 119 */ 120 #if !defined(KTR_TESTLOG) 121 #define KTR_TESTLOG KTR_ALL 122 #endif 123 KTR_INFO_MASTER(testlog); 124 #if KTR_TESTLOG 125 KTR_INFO(KTR_TESTLOG, testlog, test1, 0, "test1 %d %d %d %d", int dummy1, int dummy2, int dummy3, int dummy4); 126 KTR_INFO(KTR_TESTLOG, testlog, test2, 1, "test2 %d %d %d %d", int dummy1, int dummy2, int dummy3, int dummy4); 127 KTR_INFO(KTR_TESTLOG, testlog, test3, 2, "test3 %d %d %d %d", int dummy1, int dummy2, int dummy3, int dummy4); 128 KTR_INFO(KTR_TESTLOG, testlog, test4, 3, "test4"); 129 KTR_INFO(KTR_TESTLOG, testlog, test5, 4, "test5"); 130 KTR_INFO(KTR_TESTLOG, testlog, test6, 5, "test6"); 131 KTR_INFO(KTR_TESTLOG, testlog, pingpong, 6, "pingpong"); 132 KTR_INFO(KTR_TESTLOG, testlog, pipeline, 7, "pipeline"); 133 KTR_INFO(KTR_TESTLOG, testlog, crit_beg, 8, "crit_beg"); 134 KTR_INFO(KTR_TESTLOG, testlog, crit_end, 9, "crit_end"); 135 KTR_INFO(KTR_TESTLOG, testlog, spin_beg, 10, "spin_beg"); 136 KTR_INFO(KTR_TESTLOG, testlog, spin_end, 11, "spin_end"); 137 #define logtest(name) KTR_LOG(testlog_ ## name, 0, 0, 0, 0) 138 #define logtest_noargs(name) KTR_LOG(testlog_ ## name) 139 #endif 140 141 MALLOC_DEFINE(M_KTR, "ktr", "ktr buffers"); 142 143 SYSCTL_NODE(_debug, OID_AUTO, ktr, CTLFLAG_RW, 0, "ktr"); 144 145 static int ktr_entries = KTR_ENTRIES_BOOT0; 146 SYSCTL_INT(_debug_ktr, OID_AUTO, entries, CTLFLAG_RD, &ktr_entries, 0, 147 "Size of the event buffer"); 148 static int ktr_entries_mask = KTR_ENTRIES_BOOT0_MASK; 149 150 static int ktr_version = KTR_VERSION; 151 SYSCTL_INT(_debug_ktr, OID_AUTO, version, CTLFLAG_RD, &ktr_version, 0, ""); 152 153 static int ktr_stacktrace = 1; 154 SYSCTL_INT(_debug_ktr, OID_AUTO, stacktrace, CTLFLAG_RD, &ktr_stacktrace, 0, ""); 155 156 static int ktr_resynchronize = 0; 157 SYSCTL_INT(_debug_ktr, OID_AUTO, resynchronize, CTLFLAG_RW, 158 &ktr_resynchronize, 0, "Resynchronize TSC 10 times a second"); 159 160 #if KTR_TESTLOG 161 static int ktr_testlogcnt = 0; 162 SYSCTL_INT(_debug_ktr, OID_AUTO, testlogcnt, CTLFLAG_RW, &ktr_testlogcnt, 0, ""); 163 static int ktr_testipicnt = 0; 164 static int ktr_testipicnt_remainder; 165 SYSCTL_INT(_debug_ktr, OID_AUTO, testipicnt, CTLFLAG_RW, &ktr_testipicnt, 0, ""); 166 static int ktr_testcritcnt = 0; 167 SYSCTL_INT(_debug_ktr, OID_AUTO, testcritcnt, CTLFLAG_RW, &ktr_testcritcnt, 0, ""); 168 static int ktr_testspincnt = 0; 169 SYSCTL_INT(_debug_ktr, OID_AUTO, testspincnt, CTLFLAG_RW, &ktr_testspincnt, 0, ""); 170 #endif 171 172 /* 173 * Give cpu0 a static buffer so the tracepoint facility can be used during 174 * early boot (note however that we still use a critical section, XXX). 175 */ 176 static struct ktr_entry ktr_buf0[KTR_ENTRIES_BOOT0]; 177 178 struct ktr_cpu ktr_cpu[MAXCPU] = { 179 { .core.ktr_buf = &ktr_buf0[0] } 180 }; 181 182 static int64_t ktr_sync_tsc; 183 struct callout ktr_resync_callout; 184 185 #ifdef KTR_VERBOSE 186 int ktr_verbose = KTR_VERBOSE; 187 TUNABLE_INT("debug.ktr.verbose", &ktr_verbose); 188 SYSCTL_INT(_debug_ktr, OID_AUTO, verbose, CTLFLAG_RW, &ktr_verbose, 0, 189 "Log events to the console as well"); 190 #endif 191 192 static void ktr_resync_callback(void *dummy __unused); 193 194 extern int64_t tsc_offsets[]; 195 196 static void 197 ktr_sysinit(void *dummy) 198 { 199 struct ktr_cpu_core *kcpu; 200 int i; 201 202 for (i = 0; i < ncpus; ++i) { 203 kcpu = &ktr_cpu[i].core; 204 kcpu->ktr_buf = kmalloc(KTR_ENTRIES * sizeof(struct ktr_entry), 205 M_KTR, M_WAITOK | M_ZERO); 206 if (i == 0) { 207 /* Migrate ktrs on CPU0 to the new location */ 208 memcpy(kcpu->ktr_buf, ktr_buf0, sizeof(ktr_buf0)); 209 } 210 } 211 cpu_sfence(); 212 ktr_entries = KTR_ENTRIES; 213 ktr_entries_mask = KTR_ENTRIES_MASK; 214 215 callout_init_mp(&ktr_resync_callout); 216 callout_reset(&ktr_resync_callout, hz / 10, ktr_resync_callback, NULL); 217 } 218 SYSINIT(ktr_sysinit, SI_BOOT2_KLD, SI_ORDER_ANY, ktr_sysinit, NULL); 219 220 /* 221 * Try to resynchronize the TSC's for all cpus. This is really, really nasty. 222 * We have to send an IPIQ message to all remote cpus, wait until they 223 * get into their IPIQ processing code loop, then do an even stricter hard 224 * loop to get the cpus as close to synchronized as we can to get the most 225 * accurate reading. 226 * 227 * This callback occurs on cpu0. 228 */ 229 #if KTR_TESTLOG 230 static void ktr_pingpong_remote(void *dummy); 231 static void ktr_pipeline_remote(void *dummy); 232 #endif 233 234 #ifdef _RDTSC_SUPPORTED_ 235 236 static void ktr_resync_remote(void *dummy); 237 238 /* 239 * We use a callout callback instead of a systimer because we cannot afford 240 * to preempt anyone to do this, or we might deadlock a spin-lock or 241 * serializer between two cpus. 242 */ 243 static 244 void 245 ktr_resync_callback(void *dummy __unused) 246 { 247 struct lwkt_cpusync cs; 248 #if KTR_TESTLOG 249 int count; 250 #endif 251 252 KKASSERT(mycpu->gd_cpuid == 0); 253 254 #if KTR_TESTLOG 255 /* 256 * Test logging 257 */ 258 if (ktr_testlogcnt) { 259 --ktr_testlogcnt; 260 cpu_disable_intr(); 261 logtest(test1); 262 logtest(test2); 263 logtest(test3); 264 logtest_noargs(test4); 265 logtest_noargs(test5); 266 logtest_noargs(test6); 267 cpu_enable_intr(); 268 } 269 270 /* 271 * Test IPI messaging 272 */ 273 if (ktr_testipicnt && ktr_testipicnt_remainder == 0 && ncpus > 1) { 274 ktr_testipicnt_remainder = ktr_testipicnt; 275 ktr_testipicnt = 0; 276 lwkt_send_ipiq_bycpu(1, ktr_pingpong_remote, NULL); 277 } 278 279 /* 280 * Test critical sections 281 */ 282 if (ktr_testcritcnt) { 283 crit_enter(); 284 crit_exit(); 285 logtest_noargs(crit_beg); 286 for (count = ktr_testcritcnt; count; --count) { 287 crit_enter(); 288 crit_exit(); 289 } 290 logtest_noargs(crit_end); 291 ktr_testcritcnt = 0; 292 } 293 294 /* 295 * Test spinlock sections 296 */ 297 if (ktr_testspincnt) { 298 struct spinlock spin; 299 300 spin_init(&spin, "ktrresync"); 301 spin_lock(&spin); 302 spin_unlock(&spin); 303 logtest_noargs(spin_beg); 304 for (count = ktr_testspincnt; count; --count) { 305 spin_lock(&spin); 306 spin_unlock(&spin); 307 } 308 logtest_noargs(spin_end); 309 ktr_testspincnt = 0; 310 } 311 #endif 312 313 /* 314 * Resynchronize the TSC 315 */ 316 if (ktr_resynchronize == 0) 317 goto done; 318 if ((cpu_feature & CPUID_TSC) == 0) 319 return; 320 321 crit_enter(); 322 lwkt_cpusync_init(&cs, smp_active_mask, ktr_resync_remote, 323 (void *)(intptr_t)mycpu->gd_cpuid); 324 lwkt_cpusync_interlock(&cs); 325 ktr_sync_tsc = rdtsc(); 326 lwkt_cpusync_deinterlock(&cs); 327 crit_exit(); 328 done: 329 callout_reset(&ktr_resync_callout, hz / 10, ktr_resync_callback, NULL); 330 } 331 332 /* 333 * The remote-end of the KTR synchronization protocol runs on all cpus. 334 * The one we run on the controlling cpu updates its tsc continuously 335 * until the others have finished syncing (theoretically), but we don't 336 * loop forever. 337 * 338 * This is a bit ad-hoc but we need to avoid livelocking inside an IPI 339 * callback. rdtsc() is a synchronizing instruction (I think). 340 */ 341 static void 342 ktr_resync_remote(void *arg) 343 { 344 globaldata_t gd = mycpu; 345 int64_t delta; 346 int i; 347 348 if (gd->gd_cpuid == (int)(intptr_t)arg) { 349 for (i = 0; i < 2000; ++i) 350 ktr_sync_tsc = rdtsc(); 351 } else { 352 delta = rdtsc() - ktr_sync_tsc; 353 if (tsc_offsets[gd->gd_cpuid] == 0) 354 tsc_offsets[gd->gd_cpuid] = delta; 355 tsc_offsets[gd->gd_cpuid] = 356 (tsc_offsets[gd->gd_cpuid] * 7 + delta) / 8; 357 } 358 } 359 360 #if KTR_TESTLOG 361 362 static 363 void 364 ktr_pingpong_remote(void *dummy __unused) 365 { 366 int other_cpu; 367 368 logtest_noargs(pingpong); 369 other_cpu = 1 - mycpu->gd_cpuid; 370 if (ktr_testipicnt_remainder) { 371 --ktr_testipicnt_remainder; 372 lwkt_send_ipiq_bycpu(other_cpu, ktr_pingpong_remote, NULL); 373 } else { 374 lwkt_send_ipiq_bycpu(other_cpu, ktr_pipeline_remote, NULL); 375 lwkt_send_ipiq_bycpu(other_cpu, ktr_pipeline_remote, NULL); 376 lwkt_send_ipiq_bycpu(other_cpu, ktr_pipeline_remote, NULL); 377 lwkt_send_ipiq_bycpu(other_cpu, ktr_pipeline_remote, NULL); 378 lwkt_send_ipiq_bycpu(other_cpu, ktr_pipeline_remote, NULL); 379 } 380 } 381 382 static 383 void 384 ktr_pipeline_remote(void *dummy __unused) 385 { 386 logtest_noargs(pipeline); 387 } 388 389 #endif 390 391 #else /* !_RDTSC_SUPPORTED_ */ 392 393 /* 394 * The resync callback for UP doesn't do anything other then run the test 395 * log messages. If test logging is not enabled, don't bother resetting 396 * the callout. 397 */ 398 static 399 void 400 ktr_resync_callback(void *dummy __unused) 401 { 402 #if KTR_TESTLOG 403 /* 404 * Test logging 405 */ 406 if (ktr_testlogcnt) { 407 --ktr_testlogcnt; 408 cpu_disable_intr(); 409 logtest(test1); 410 logtest(test2); 411 logtest(test3); 412 logtest_noargs(test4); 413 logtest_noargs(test5); 414 logtest_noargs(test6); 415 cpu_enable_intr(); 416 } 417 callout_reset(&ktr_resync_callout, hz / 10, ktr_resync_callback, NULL); 418 #endif 419 } 420 421 #endif 422 423 /* 424 * Setup the next empty slot and return it to the caller to store the data 425 * directly. 426 */ 427 struct ktr_entry * 428 ktr_begin_write_entry(struct ktr_info *info, const char *file, int line) 429 { 430 struct ktr_cpu_core *kcpu; 431 struct ktr_entry *entry; 432 int cpu; 433 434 cpu = mycpu->gd_cpuid; 435 kcpu = &ktr_cpu[cpu].core; 436 if (panicstr) /* stop logging during panic */ 437 return NULL; 438 if (kcpu->ktr_buf == NULL) /* too early in boot */ 439 return NULL; 440 441 crit_enter(); 442 entry = kcpu->ktr_buf + (kcpu->ktr_idx & ktr_entries_mask); 443 ++kcpu->ktr_idx; 444 #ifdef _RDTSC_SUPPORTED_ 445 if (cpu_feature & CPUID_TSC) { 446 entry->ktr_timestamp = rdtsc() - tsc_offsets[cpu]; 447 } else 448 #endif 449 { 450 entry->ktr_timestamp = get_approximate_time_t(); 451 } 452 entry->ktr_info = info; 453 entry->ktr_file = file; 454 entry->ktr_line = line; 455 crit_exit(); 456 return entry; 457 } 458 459 int 460 ktr_finish_write_entry(struct ktr_info *info, struct ktr_entry *entry) 461 { 462 if (ktr_stacktrace) 463 cpu_ktr_caller(entry); 464 #ifdef KTR_VERBOSE 465 if (ktr_verbose && info->kf_format) { 466 kprintf("cpu%d ", mycpu->gd_cpuid); 467 if (ktr_verbose > 1) { 468 kprintf("%s.%d\t", entry->ktr_file, entry->ktr_line); 469 } 470 return !0; 471 } 472 #endif 473 return 0; 474 } 475 476 #ifdef DDB 477 478 #define NUM_LINES_PER_PAGE 19 479 480 struct tstate { 481 int cur; 482 int first; 483 }; 484 485 static int db_ktr_verbose; 486 static int db_mach_vtrace(int cpu, struct ktr_entry *kp, int idx); 487 488 DB_SHOW_COMMAND(ktr, db_ktr_all) 489 { 490 struct ktr_cpu_core *kcpu; 491 int a_flag = 0; 492 int c; 493 int nl = 0; 494 int i; 495 struct tstate tstate[MAXCPU]; 496 int printcpu = -1; 497 498 for(i = 0; i < ncpus; i++) { 499 kcpu = &ktr_cpu[i].core; 500 tstate[i].first = -1; 501 tstate[i].cur = (kcpu->ktr_idx - 1) & ktr_entries_mask; 502 } 503 db_ktr_verbose = 0; 504 while ((c = *(modif++)) != '\0') { 505 if (c == 'v') { 506 db_ktr_verbose = 1; 507 } 508 else if (c == 'a') { 509 a_flag = 1; 510 } 511 else if (c == 'c') { 512 printcpu = 0; 513 while ((c = *(modif++)) != '\0') { 514 if (isdigit(c)) { 515 printcpu *= 10; 516 printcpu += c - '0'; 517 } 518 else { 519 modif++; 520 break; 521 } 522 } 523 modif--; 524 } 525 } 526 if (printcpu > ncpus - 1) { 527 db_printf("Invalid cpu number\n"); 528 return; 529 } 530 /* 531 * Lopp throug all the buffers and print the content of them, sorted 532 * by the timestamp. 533 */ 534 while (1) { 535 int counter; 536 u_int64_t highest_ts; 537 int highest_cpu; 538 struct ktr_entry *kp; 539 540 if (a_flag == 1 && cncheckc() != -1) 541 return; 542 highest_ts = 0; 543 highest_cpu = -1; 544 /* 545 * Find the lowest timestamp 546 */ 547 for (i = 0, counter = 0; i < ncpus; i++) { 548 kcpu = &ktr_cpu[i].core; 549 if (kcpu->ktr_buf == NULL) 550 continue; 551 if (printcpu != -1 && printcpu != i) 552 continue; 553 if (tstate[i].cur == -1) { 554 counter++; 555 if (counter == ncpus) { 556 db_printf("--- End of trace buffer ---\n"); 557 return; 558 } 559 continue; 560 } 561 if (kcpu->ktr_buf[tstate[i].cur].ktr_timestamp > highest_ts) { 562 highest_ts = kcpu->ktr_buf[tstate[i].cur].ktr_timestamp; 563 highest_cpu = i; 564 } 565 } 566 if (highest_cpu < 0) { 567 db_printf("no KTR data available\n"); 568 break; 569 } 570 i = highest_cpu; 571 kcpu = &ktr_cpu[i].core; 572 kp = &kcpu->ktr_buf[tstate[i].cur]; 573 if (tstate[i].first == -1) 574 tstate[i].first = tstate[i].cur; 575 if (--tstate[i].cur < 0) 576 tstate[i].cur = ktr_entries - 1; 577 if (tstate[i].first == tstate[i].cur) { 578 db_mach_vtrace(i, kp, tstate[i].cur + 1); 579 tstate[i].cur = -1; 580 continue; 581 } 582 if (kcpu->ktr_buf[tstate[i].cur].ktr_info == NULL) 583 tstate[i].cur = -1; 584 if (db_more(&nl) == -1) 585 break; 586 if (db_mach_vtrace(i, kp, tstate[i].cur + 1) == 0) 587 tstate[i].cur = -1; 588 } 589 } 590 591 static int 592 db_mach_vtrace(int cpu, struct ktr_entry *kp, int idx) 593 { 594 if (kp->ktr_info == NULL) 595 return(0); 596 db_printf("cpu%d ", cpu); 597 db_printf("%d: ", idx); 598 if (db_ktr_verbose) { 599 db_printf("%10.10lld %s.%d\t", (long long)kp->ktr_timestamp, 600 kp->ktr_file, kp->ktr_line); 601 } 602 db_printf("%s\t", kp->ktr_info->kf_name); 603 db_printf("from(%p,%p) ", kp->ktr_caller1, kp->ktr_caller2); 604 #ifdef __i386__ 605 if (kp->ktr_info->kf_format) 606 db_vprintf(kp->ktr_info->kf_format, (__va_list)kp->ktr_data); 607 #endif 608 db_printf("\n"); 609 610 return(1); 611 } 612 613 #endif /* DDB */ 614