The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_ktr.c

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    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  * test logging support.  When ktr_testlogcnt is non-zero each synchronization
  103  * interrupt will issue six back-to-back ktr logging messages on cpu 0
  104  * so the user can determine KTR logging overheads.
  105  */
  106 #if !defined(KTR_TESTLOG)
  107 #define KTR_TESTLOG     KTR_ALL
  108 #endif
  109 KTR_INFO_MASTER(testlog);
  110 #if KTR_TESTLOG
  111 KTR_INFO(KTR_TESTLOG, testlog, test1, 0, "test1 %d %d %d %d", int dummy1, int dummy2, int dummy3, int dummy4);
  112 KTR_INFO(KTR_TESTLOG, testlog, test2, 1, "test2 %d %d %d %d", int dummy1, int dummy2, int dummy3, int dummy4);
  113 KTR_INFO(KTR_TESTLOG, testlog, test3, 2, "test3 %d %d %d %d", int dummy1, int dummy2, int dummy3, int dummy4);
  114 KTR_INFO(KTR_TESTLOG, testlog, test4, 3, "test4");
  115 KTR_INFO(KTR_TESTLOG, testlog, test5, 4, "test5");
  116 KTR_INFO(KTR_TESTLOG, testlog, test6, 5, "test6");
  117 KTR_INFO(KTR_TESTLOG, testlog, pingpong, 6, "pingpong");
  118 KTR_INFO(KTR_TESTLOG, testlog, pipeline, 7, "pipeline");
  119 KTR_INFO(KTR_TESTLOG, testlog, crit_beg, 8, "crit_beg");
  120 KTR_INFO(KTR_TESTLOG, testlog, crit_end, 9, "crit_end");
  121 KTR_INFO(KTR_TESTLOG, testlog, spin_beg, 10, "spin_beg");
  122 KTR_INFO(KTR_TESTLOG, testlog, spin_end, 11, "spin_end");
  123 #define logtest(name)   KTR_LOG(testlog_ ## name, 0, 0, 0, 0)
  124 #define logtest_noargs(name)    KTR_LOG(testlog_ ## name)
  125 #endif
  126 
  127 MALLOC_DEFINE(M_KTR, "ktr", "ktr buffers");
  128 
  129 SYSCTL_NODE(_debug, OID_AUTO, ktr, CTLFLAG_RW, 0, "ktr");
  130 
  131 int             ktr_entries = KTR_ENTRIES;
  132 SYSCTL_INT(_debug_ktr, OID_AUTO, entries, CTLFLAG_RD, &ktr_entries, 0,
  133     "Size of the event buffer");
  134 
  135 int             ktr_version = KTR_VERSION;
  136 SYSCTL_INT(_debug_ktr, OID_AUTO, version, CTLFLAG_RD, &ktr_version, 0, "");
  137 
  138 static int      ktr_stacktrace = 1;
  139 SYSCTL_INT(_debug_ktr, OID_AUTO, stacktrace, CTLFLAG_RD, &ktr_stacktrace, 0, "");
  140 
  141 static int      ktr_resynchronize = 0;
  142 SYSCTL_INT(_debug_ktr, OID_AUTO, resynchronize, CTLFLAG_RW,
  143     &ktr_resynchronize, 0, "Resynchronize TSC 10 times a second");
  144 
  145 #if KTR_TESTLOG
  146 static int      ktr_testlogcnt = 0;
  147 SYSCTL_INT(_debug_ktr, OID_AUTO, testlogcnt, CTLFLAG_RW, &ktr_testlogcnt, 0, "");
  148 static int      ktr_testipicnt = 0;
  149 static int      ktr_testipicnt_remainder;
  150 SYSCTL_INT(_debug_ktr, OID_AUTO, testipicnt, CTLFLAG_RW, &ktr_testipicnt, 0, "");
  151 static int      ktr_testcritcnt = 0;
  152 SYSCTL_INT(_debug_ktr, OID_AUTO, testcritcnt, CTLFLAG_RW, &ktr_testcritcnt, 0, "");
  153 static int      ktr_testspincnt = 0;
  154 SYSCTL_INT(_debug_ktr, OID_AUTO, testspincnt, CTLFLAG_RW, &ktr_testspincnt, 0, "");
  155 #endif
  156 
  157 /*
  158  * Give cpu0 a static buffer so the tracepoint facility can be used during
  159  * early boot (note however that we still use a critical section, XXX).
  160  */
  161 static struct   ktr_entry ktr_buf0[KTR_ENTRIES];
  162 
  163 struct ktr_cpu ktr_cpu[MAXCPU] = {
  164         { .core.ktr_buf = &ktr_buf0[0] }
  165 };
  166 
  167 static int64_t  ktr_sync_tsc;
  168 struct callout  ktr_resync_callout;
  169 
  170 #ifdef KTR_VERBOSE
  171 int     ktr_verbose = KTR_VERBOSE;
  172 TUNABLE_INT("debug.ktr.verbose", &ktr_verbose);
  173 SYSCTL_INT(_debug_ktr, OID_AUTO, verbose, CTLFLAG_RW, &ktr_verbose, 0,
  174     "Log events to the console as well");
  175 #endif
  176 
  177 static void ktr_resync_callback(void *dummy __unused);
  178 
  179 extern int64_t tsc_offsets[];
  180 
  181 static void
  182 ktr_sysinit(void *dummy)
  183 {
  184         struct ktr_cpu_core *kcpu;
  185         int i;
  186 
  187         for(i = 1; i < ncpus; ++i) {
  188                 kcpu = &ktr_cpu[i].core;
  189                 kcpu->ktr_buf = kmalloc(KTR_ENTRIES * sizeof(struct ktr_entry),
  190                                         M_KTR, M_WAITOK | M_ZERO);
  191         }
  192         callout_init_mp(&ktr_resync_callout);
  193         callout_reset(&ktr_resync_callout, hz / 10, ktr_resync_callback, NULL);
  194 }
  195 SYSINIT(ktr_sysinit, SI_BOOT2_KLD, SI_ORDER_ANY, ktr_sysinit, NULL);
  196 
  197 /*
  198  * Try to resynchronize the TSC's for all cpus.  This is really, really nasty.
  199  * We have to send an IPIQ message to all remote cpus, wait until they 
  200  * get into their IPIQ processing code loop, then do an even stricter hard
  201  * loop to get the cpus as close to synchronized as we can to get the most
  202  * accurate reading.
  203  *
  204  * This callback occurs on cpu0.
  205  */
  206 #if KTR_TESTLOG
  207 static void ktr_pingpong_remote(void *dummy);
  208 static void ktr_pipeline_remote(void *dummy);
  209 #endif
  210 
  211 #ifdef _RDTSC_SUPPORTED_
  212 
  213 static void ktr_resync_remote(void *dummy);
  214 
  215 /*
  216  * We use a callout callback instead of a systimer because we cannot afford
  217  * to preempt anyone to do this, or we might deadlock a spin-lock or 
  218  * serializer between two cpus.
  219  */
  220 static
  221 void 
  222 ktr_resync_callback(void *dummy __unused)
  223 {
  224         struct lwkt_cpusync cs;
  225 #if KTR_TESTLOG
  226         int count;
  227 #endif
  228 
  229         KKASSERT(mycpu->gd_cpuid == 0);
  230 
  231 #if KTR_TESTLOG
  232         /*
  233          * Test logging
  234          */
  235         if (ktr_testlogcnt) {
  236                 --ktr_testlogcnt;
  237                 cpu_disable_intr();
  238                 logtest(test1);
  239                 logtest(test2);
  240                 logtest(test3);
  241                 logtest_noargs(test4);
  242                 logtest_noargs(test5);
  243                 logtest_noargs(test6);
  244                 cpu_enable_intr();
  245         }
  246 
  247         /*
  248          * Test IPI messaging
  249          */
  250         if (ktr_testipicnt && ktr_testipicnt_remainder == 0 && ncpus > 1) {
  251                 ktr_testipicnt_remainder = ktr_testipicnt;
  252                 ktr_testipicnt = 0;
  253                 lwkt_send_ipiq_bycpu(1, ktr_pingpong_remote, NULL);
  254         }
  255 
  256         /*
  257          * Test critical sections
  258          */
  259         if (ktr_testcritcnt) {
  260                 crit_enter();
  261                 crit_exit();
  262                 logtest_noargs(crit_beg);
  263                 for (count = ktr_testcritcnt; count; --count) {
  264                         crit_enter();
  265                         crit_exit();
  266                 }
  267                 logtest_noargs(crit_end);
  268                 ktr_testcritcnt = 0;
  269         }
  270 
  271         /*
  272          * Test spinlock sections
  273          */
  274         if (ktr_testspincnt) {
  275                 struct spinlock spin;
  276 
  277                 spin_init(&spin);
  278                 spin_lock(&spin);
  279                 spin_unlock(&spin);
  280                 logtest_noargs(spin_beg);
  281                 for (count = ktr_testspincnt; count; --count) {
  282                         spin_lock(&spin);
  283                         spin_unlock(&spin);
  284                 }
  285                 logtest_noargs(spin_end);
  286                 ktr_testspincnt = 0;
  287         }
  288 #endif
  289 
  290         /*
  291          * Resynchronize the TSC
  292          */
  293         if (ktr_resynchronize == 0)
  294                 goto done;
  295         if ((cpu_feature & CPUID_TSC) == 0)
  296                 return;
  297 
  298         crit_enter();
  299         lwkt_cpusync_init(&cs, smp_active_mask, ktr_resync_remote,
  300                           (void *)(intptr_t)mycpu->gd_cpuid);
  301         lwkt_cpusync_interlock(&cs);
  302         ktr_sync_tsc = rdtsc();
  303         lwkt_cpusync_deinterlock(&cs);
  304         crit_exit();
  305 done:
  306         callout_reset(&ktr_resync_callout, hz / 10, ktr_resync_callback, NULL);
  307 }
  308 
  309 /*
  310  * The remote-end of the KTR synchronization protocol runs on all cpus.
  311  * The one we run on the controlling cpu updates its tsc continuously
  312  * until the others have finished syncing (theoretically), but we don't
  313  * loop forever.
  314  *
  315  * This is a bit ad-hoc but we need to avoid livelocking inside an IPI
  316  * callback.  rdtsc() is a synchronizing instruction (I think).
  317  */
  318 static void
  319 ktr_resync_remote(void *arg)
  320 {
  321         globaldata_t gd = mycpu;
  322         int64_t delta;
  323         int i;
  324 
  325         if (gd->gd_cpuid == (int)(intptr_t)arg) {
  326                 for (i = 0; i < 2000; ++i)
  327                         ktr_sync_tsc = rdtsc();
  328         } else {
  329                 delta = rdtsc() - ktr_sync_tsc;
  330                 if (tsc_offsets[gd->gd_cpuid] == 0)
  331                         tsc_offsets[gd->gd_cpuid] = delta;
  332                 tsc_offsets[gd->gd_cpuid] =
  333                         (tsc_offsets[gd->gd_cpuid] * 7 + delta) / 8;
  334         }
  335 }
  336 
  337 #if KTR_TESTLOG
  338 
  339 static
  340 void
  341 ktr_pingpong_remote(void *dummy __unused)
  342 {
  343         int other_cpu;
  344 
  345         logtest_noargs(pingpong);
  346         other_cpu = 1 - mycpu->gd_cpuid;
  347         if (ktr_testipicnt_remainder) {
  348                 --ktr_testipicnt_remainder;
  349                 lwkt_send_ipiq_bycpu(other_cpu, ktr_pingpong_remote, NULL);
  350         } else {
  351                 lwkt_send_ipiq_bycpu(other_cpu, ktr_pipeline_remote, NULL);
  352                 lwkt_send_ipiq_bycpu(other_cpu, ktr_pipeline_remote, NULL);
  353                 lwkt_send_ipiq_bycpu(other_cpu, ktr_pipeline_remote, NULL);
  354                 lwkt_send_ipiq_bycpu(other_cpu, ktr_pipeline_remote, NULL);
  355                 lwkt_send_ipiq_bycpu(other_cpu, ktr_pipeline_remote, NULL);
  356         }
  357 }
  358 
  359 static
  360 void
  361 ktr_pipeline_remote(void *dummy __unused)
  362 {
  363         logtest_noargs(pipeline);
  364 }
  365 
  366 #endif
  367 
  368 #else   /* !_RDTSC_SUPPORTED_ */
  369 
  370 /*
  371  * The resync callback for UP doesn't do anything other then run the test
  372  * log messages.  If test logging is not enabled, don't bother resetting
  373  * the callout.
  374  */
  375 static
  376 void 
  377 ktr_resync_callback(void *dummy __unused)
  378 {
  379 #if KTR_TESTLOG
  380         /*
  381          * Test logging
  382          */
  383         if (ktr_testlogcnt) {
  384                 --ktr_testlogcnt;
  385                 cpu_disable_intr();
  386                 logtest(test1);
  387                 logtest(test2);
  388                 logtest(test3);
  389                 logtest_noargs(test4);
  390                 logtest_noargs(test5);
  391                 logtest_noargs(test6);
  392                 cpu_enable_intr();
  393         }
  394         callout_reset(&ktr_resync_callout, hz / 10, ktr_resync_callback, NULL);
  395 #endif
  396 }
  397 
  398 #endif
  399 
  400 /*
  401  * Setup the next empty slot and return it to the caller to store the data
  402  * directly.
  403  */
  404 struct ktr_entry *
  405 ktr_begin_write_entry(struct ktr_info *info, const char *file, int line)
  406 {
  407         struct ktr_cpu_core *kcpu;
  408         struct ktr_entry *entry;
  409         int cpu;
  410 
  411         cpu = mycpu->gd_cpuid;
  412         kcpu = &ktr_cpu[cpu].core;
  413         if (panicstr)                   /* stop logging during panic */
  414                 return NULL;
  415         if (kcpu->ktr_buf == NULL)      /* too early in boot */
  416                 return NULL;
  417 
  418         crit_enter();
  419         entry = kcpu->ktr_buf + (kcpu->ktr_idx & KTR_ENTRIES_MASK);
  420         ++kcpu->ktr_idx;
  421 #ifdef _RDTSC_SUPPORTED_
  422         if (cpu_feature & CPUID_TSC) {
  423                 entry->ktr_timestamp = rdtsc() - tsc_offsets[cpu];
  424         } else
  425 #endif
  426         {
  427                 entry->ktr_timestamp = get_approximate_time_t();
  428         }
  429         entry->ktr_info = info;
  430         entry->ktr_file = file;
  431         entry->ktr_line = line;
  432         crit_exit();
  433         return entry;
  434 }
  435 
  436 int
  437 ktr_finish_write_entry(struct ktr_info *info, struct ktr_entry *entry)
  438 {
  439         if (ktr_stacktrace)
  440                 cpu_ktr_caller(entry);
  441 #ifdef KTR_VERBOSE
  442         if (ktr_verbose && info->kf_format) {
  443                 kprintf("cpu%d ", mycpu->gd_cpuid);
  444                 if (ktr_verbose > 1) {
  445                         kprintf("%s.%d\t", entry->ktr_file, entry->ktr_line);
  446                 }
  447                 return !0;
  448         }
  449 #endif
  450         return 0;
  451 }
  452 
  453 #ifdef DDB
  454 
  455 #define NUM_LINES_PER_PAGE      19
  456 
  457 struct tstate {
  458         int     cur;
  459         int     first;
  460 };
  461 
  462 static  int db_ktr_verbose;
  463 static  int db_mach_vtrace(int cpu, struct ktr_entry *kp, int idx);
  464 
  465 DB_SHOW_COMMAND(ktr, db_ktr_all)
  466 {
  467         struct ktr_cpu_core *kcpu;
  468         int a_flag = 0;
  469         int c;
  470         int nl = 0;
  471         int i;
  472         struct tstate tstate[MAXCPU];
  473         int printcpu = -1;
  474 
  475         for(i = 0; i < ncpus; i++) {
  476                 kcpu = &ktr_cpu[i].core;
  477                 tstate[i].first = -1;
  478                 tstate[i].cur = (kcpu->ktr_idx - 1) & KTR_ENTRIES_MASK;
  479         }
  480         db_ktr_verbose = 0;
  481         while ((c = *(modif++)) != '\0') {
  482                 if (c == 'v') {
  483                         db_ktr_verbose = 1;
  484                 }
  485                 else if (c == 'a') {
  486                         a_flag = 1;
  487                 }
  488                 else if (c == 'c') {
  489                         printcpu = 0;
  490                         while ((c = *(modif++)) != '\0') {
  491                                 if (isdigit(c)) {
  492                                         printcpu *= 10;
  493                                         printcpu += c - '';
  494                                 }
  495                                 else {
  496                                         modif++;
  497                                         break;
  498                                 }
  499                         }
  500                         modif--;
  501                 }
  502         }
  503         if (printcpu > ncpus - 1) {
  504                 db_printf("Invalid cpu number\n");
  505                 return;
  506         }
  507         /*
  508          * Lopp throug all the buffers and print the content of them, sorted
  509          * by the timestamp.
  510          */
  511         while (1) {
  512                 int counter;
  513                 u_int64_t highest_ts;
  514                 int highest_cpu;
  515                 struct ktr_entry *kp;
  516 
  517                 if (a_flag == 1 && cncheckc() != -1)
  518                         return;
  519                 highest_ts = 0;
  520                 highest_cpu = -1;
  521                 /*
  522                  * Find the lowest timestamp
  523                  */
  524                 for (i = 0, counter = 0; i < ncpus; i++) {
  525                         kcpu = &ktr_cpu[i].core;
  526                         if (kcpu->ktr_buf == NULL)
  527                                 continue;
  528                         if (printcpu != -1 && printcpu != i)
  529                                 continue;
  530                         if (tstate[i].cur == -1) {
  531                                 counter++;
  532                                 if (counter == ncpus) {
  533                                         db_printf("--- End of trace buffer ---\n");
  534                                         return;
  535                                 }
  536                                 continue;
  537                         }
  538                         if (kcpu->ktr_buf[tstate[i].cur].ktr_timestamp > highest_ts) {
  539                                 highest_ts = kcpu->ktr_buf[tstate[i].cur].ktr_timestamp;
  540                                 highest_cpu = i;
  541                         }
  542                 }
  543                 if (highest_cpu < 0) {
  544                         db_printf("no KTR data available\n");
  545                         break;
  546                 }
  547                 i = highest_cpu;
  548                 kcpu = &ktr_cpu[i].core;
  549                 kp = &kcpu->ktr_buf[tstate[i].cur];
  550                 if (tstate[i].first == -1)
  551                         tstate[i].first = tstate[i].cur;
  552                 if (--tstate[i].cur < 0)
  553                         tstate[i].cur = KTR_ENTRIES - 1;
  554                 if (tstate[i].first == tstate[i].cur) {
  555                         db_mach_vtrace(i, kp, tstate[i].cur + 1);
  556                         tstate[i].cur = -1;
  557                         continue;
  558                 }
  559                 if (kcpu->ktr_buf[tstate[i].cur].ktr_info == NULL)
  560                         tstate[i].cur = -1;
  561                 if (db_more(&nl) == -1)
  562                         break;
  563                 if (db_mach_vtrace(i, kp, tstate[i].cur + 1) == 0)
  564                         tstate[i].cur = -1;
  565         }
  566 }
  567 
  568 static int
  569 db_mach_vtrace(int cpu, struct ktr_entry *kp, int idx)
  570 {
  571         if (kp->ktr_info == NULL)
  572                 return(0);
  573         db_printf("cpu%d ", cpu);
  574         db_printf("%d: ", idx);
  575         if (db_ktr_verbose) {
  576                 db_printf("%10.10lld %s.%d\t", (long long)kp->ktr_timestamp,
  577                     kp->ktr_file, kp->ktr_line);
  578         }
  579         db_printf("%s\t", kp->ktr_info->kf_name);
  580         db_printf("from(%p,%p) ", kp->ktr_caller1, kp->ktr_caller2);
  581 #ifdef __i386__
  582         if (kp->ktr_info->kf_format)
  583                 db_vprintf(kp->ktr_info->kf_format, (__va_list)kp->ktr_data);
  584 #endif
  585         db_printf("\n");
  586 
  587         return(1);
  588 }
  589 
  590 #endif  /* DDB */

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