sys/cddl/dev/profile/profile.c

   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  * Portions Copyright 2006-2008 John Birrell jb@freebsd.org
  22  *
  23  * $FreeBSD$
  24  *
  25  */
  26
  27 /*
  28  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  29  * Use is subject to license terms.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #include <sys/param.h>
  34 #include <sys/systm.h>
  35 #include <sys/conf.h>
  36 #include <sys/cpuvar.h>
  37 #include <sys/endian.h>
  38 #include <sys/fcntl.h>
  39 #include <sys/filio.h>
  40 #include <sys/kdb.h>
  41 #include <sys/kernel.h>
  42 #include <sys/kmem.h>
  43 #include <sys/kthread.h>
  44 #include <sys/limits.h>
  45 #include <sys/linker.h>
  46 #include <sys/lock.h>
  47 #include <sys/malloc.h>
  48 #include <sys/module.h>
  49 #include <sys/mutex.h>
  50 #include <sys/poll.h>
  51 #include <sys/proc.h>
  52 #include <sys/selinfo.h>
  53 #include <sys/smp.h>
  54 #include <sys/sysctl.h>
  55 #include <sys/uio.h>
  56 #include <sys/unistd.h>
  57 #include <machine/cpu.h>
  58 #include <machine/stdarg.h>
  59
  60 #include <sys/dtrace.h>
  61 #include <sys/dtrace_bsd.h>
  62
  63 #define PROF_NAMELEN            15
  64
  65 #define PROF_PROFILE            0
  66 #define PROF_TICK               1
  67 #define PROF_PREFIX_PROFILE     "profile-"
  68 #define PROF_PREFIX_TICK        "tick-"
  69
  70 /*
  71  * Regardless of platform, there are five artificial frames in the case of the
  72  * profile provider:
  73  *
  74  *      profile_fire
  75  *      cyclic_expire
  76  *      cyclic_fire
  77  *      [ cbe ]
  78  *      [ locore ]
  79  *
  80  * On amd64, there are two frames associated with locore:  one in locore, and
  81  * another in common interrupt dispatch code.  (i386 has not been modified to
  82  * use this common layer.)  Further, on i386, the interrupted instruction
  83  * appears as its own stack frame.  All of this means that we need to add one
  84  * frame for amd64, and then take one away for both amd64 and i386.
  85  *
  86  * All of the above constraints lead to the mess below.  Yes, the profile
  87  * provider should ideally figure this out on-the-fly by hiting one of its own
  88  * probes and then walking its own stack trace.  This is complicated, however,
  89  * and the static definition doesn't seem to be overly brittle.  Still, we
  90  * allow for a manual override in case we get it completely wrong.
  91  */
  92 #ifdef __amd64
  93 #define PROF_ARTIFICIAL_FRAMES  10
  94 #else
  95 #ifdef __i386
  96 #define PROF_ARTIFICIAL_FRAMES  6
  97 #endif
  98 #endif
  99
 100 #ifdef __powerpc__
 101 /*
 102  * This value is bogus just to make module compilable on powerpc
 103  */
 104 #define PROF_ARTIFICIAL_FRAMES  8
 105 #endif
 106
 107 struct profile_probe_percpu;
 108
 109 #ifdef __arm__
 110 #define PROF_ARTIFICIAL_FRAMES  3
 111 #endif
 112
 113 #ifdef __aarch64__
 114 #define PROF_ARTIFICIAL_FRAMES  12
 115 #endif
 116
 117 #ifdef __riscv
 118 #define PROF_ARTIFICIAL_FRAMES  12
 119 #endif
 120
 121 typedef struct profile_probe {
 122         char            prof_name[PROF_NAMELEN];
 123         dtrace_id_t     prof_id;
 124         int             prof_kind;
 125 #ifdef illumos
 126         hrtime_t        prof_interval;
 127         cyclic_id_t     prof_cyclic;
 128 #else
 129         sbintime_t      prof_interval;
 130         struct callout  prof_cyclic;
 131         sbintime_t      prof_expected;
 132         struct profile_probe_percpu **prof_pcpus;
 133 #endif
 134 } profile_probe_t;
 135
 136 typedef struct profile_probe_percpu {
 137         hrtime_t        profc_expected;
 138         hrtime_t        profc_interval;
 139         profile_probe_t *profc_probe;
 140 #ifdef __FreeBSD__
 141         struct callout  profc_cyclic;
 142 #endif
 143 } profile_probe_percpu_t;
 144
 145 static int      profile_unload(void);
 146 static void     profile_create(hrtime_t, char *, int);
 147 static void     profile_destroy(void *, dtrace_id_t, void *);
 148 static void     profile_enable(void *, dtrace_id_t, void *);
 149 static void     profile_disable(void *, dtrace_id_t, void *);
 150 static void     profile_load(void *);
 151 static void     profile_provide(void *, dtrace_probedesc_t *);
 152
 153 static int profile_rates[] = {
 154     97, 199, 499, 997, 1999,
 155     4001, 4999, 0, 0, 0,
 156     0, 0, 0, 0, 0,
 157     0, 0, 0, 0, 0
 158 };
 159
 160 static int profile_ticks[] = {
 161     1, 10, 100, 500, 1000,
 162     5000, 0, 0, 0, 0,
 163     0, 0, 0, 0, 0
 164 };
 165
 166 /*
 167  * profile_max defines the upper bound on the number of profile probes that
 168  * can exist (this is to prevent malicious or clumsy users from exhausing
 169  * system resources by creating a slew of profile probes). At mod load time,
 170  * this gets its value from PROFILE_MAX_DEFAULT or profile-max-probes if it's
 171  * present in the profile.conf file.
 172  */
 173 #define PROFILE_MAX_DEFAULT     1000    /* default max. number of probes */
 174 static uint32_t profile_max = PROFILE_MAX_DEFAULT;
 175                                         /* maximum number of profile probes */
 176 static uint32_t profile_total;          /* current number of profile probes */
 177
 178 static dtrace_pattr_t profile_attr = {
 179 { DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_COMMON },
 180 { DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN },
 181 { DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_ISA },
 182 { DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_COMMON },
 183 { DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_ISA },
 184 };
 185
 186 static dtrace_pops_t profile_pops = {
 187         .dtps_provide =         profile_provide,
 188         .dtps_provide_module =  NULL,
 189         .dtps_enable =          profile_enable,
 190         .dtps_disable =         profile_disable,
 191         .dtps_suspend =         NULL,
 192         .dtps_resume =          NULL,
 193         .dtps_getargdesc =      NULL,
 194         .dtps_getargval =       NULL,
 195         .dtps_usermode =        NULL,
 196         .dtps_destroy =         profile_destroy
 197 };
 198
 199 static dtrace_provider_id_t     profile_id;
 200 static hrtime_t                 profile_interval_min = NANOSEC / 5000;  /* 5000 hz */
 201 static int                      profile_aframes = PROF_ARTIFICIAL_FRAMES;
 202
 203 SYSCTL_DECL(_kern_dtrace);
 204 SYSCTL_NODE(_kern_dtrace, OID_AUTO, profile, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
 205     "DTrace profile parameters");
 206 SYSCTL_INT(_kern_dtrace_profile, OID_AUTO, aframes, CTLFLAG_RW, &profile_aframes,
 207     0, "Skipped frames for profile provider");
 208
 209 static sbintime_t
 210 nsec_to_sbt(hrtime_t nsec)
 211 {
 212         time_t sec;
 213
 214         /*
 215          * We need to calculate nsec * 2^32 / 10^9
 216          * Seconds and nanoseconds are split to avoid overflow.
 217          */
 218         sec = nsec / NANOSEC;
 219         nsec = nsec % NANOSEC;
 220         return (((sbintime_t)sec << 32) | ((sbintime_t)nsec << 32) / NANOSEC);
 221 }
 222
 223 static hrtime_t
 224 sbt_to_nsec(sbintime_t sbt)
 225 {
 226
 227         return ((sbt >> 32) * NANOSEC +
 228             (((uint32_t)sbt * (hrtime_t)NANOSEC) >> 32));
 229 }
 230
 231 static void
 232 profile_probe(profile_probe_t *prof, hrtime_t late)
 233 {
 234         struct thread *td;
 235         struct trapframe *frame;
 236         uintfptr_t pc, upc;
 237
 238         td = curthread;
 239         pc = upc = 0;
 240
 241         /*
 242          * td_intr_frame can be unset if this is a catch-up event upon waking up
 243          * from idle sleep. This can only happen on a CPU idle thread. Use a
 244          * representative arg0 value in this case so that one of the probe
 245          * arguments is non-zero.
 246          */
 247         frame = td->td_intr_frame;
 248         if (frame != NULL) {
 249                 if (TRAPF_USERMODE(frame))
 250                         upc = TRAPF_PC(frame);
 251                 else
 252                         pc = TRAPF_PC(frame);
 253         } else if (TD_IS_IDLETHREAD(td))
 254                 pc = (uintfptr_t)&cpu_idle;
 255
 256         dtrace_probe(prof->prof_id, pc, upc, late, 0, 0);
 257 }
 258
 259 static void
 260 profile_fire(void *arg)
 261 {
 262         profile_probe_percpu_t *pcpu = arg;
 263         profile_probe_t *prof = pcpu->profc_probe;
 264         hrtime_t late;
 265
 266         late = sbt_to_nsec(sbinuptime() - pcpu->profc_expected);
 267
 268         profile_probe(prof, late);
 269         pcpu->profc_expected += pcpu->profc_interval;
 270         callout_schedule_sbt_curcpu(&pcpu->profc_cyclic,
 271             pcpu->profc_expected, 0, C_DIRECT_EXEC | C_ABSOLUTE);
 272 }
 273
 274 static void
 275 profile_tick(void *arg)
 276 {
 277         profile_probe_t *prof = arg;
 278
 279         profile_probe(prof, 0);
 280         prof->prof_expected += prof->prof_interval;
 281         callout_schedule_sbt(&prof->prof_cyclic,
 282             prof->prof_expected, 0, C_DIRECT_EXEC | C_ABSOLUTE);
 283 }
 284
 285 static void
 286 profile_create(hrtime_t interval, char *name, int kind)
 287 {
 288         profile_probe_t *prof;
 289
 290         if (interval < profile_interval_min)
 291                 return;
 292
 293         if (dtrace_probe_lookup(profile_id, NULL, NULL, name) != 0)
 294                 return;
 295
 296         atomic_add_32(&profile_total, 1);
 297         if (profile_total > profile_max) {
 298                 atomic_add_32(&profile_total, -1);
 299                 return;
 300         }
 301
 302         prof = kmem_zalloc(sizeof (profile_probe_t), KM_SLEEP);
 303         (void) strcpy(prof->prof_name, name);
 304 #ifdef illumos
 305         prof->prof_interval = interval;
 306         prof->prof_cyclic = CYCLIC_NONE;
 307 #else
 308         prof->prof_interval = nsec_to_sbt(interval);
 309         callout_init(&prof->prof_cyclic, 1);
 310 #endif
 311         prof->prof_kind = kind;
 312         prof->prof_id = dtrace_probe_create(profile_id,
 313             NULL, NULL, name,
 314             profile_aframes, prof);
 315 }
 316
 317 /*ARGSUSED*/
 318 static void
 319 profile_provide(void *arg, dtrace_probedesc_t *desc)
 320 {
 321         int i, j, rate, kind;
 322         hrtime_t val = 0, mult = 1, len = 0;
 323         char *name, *suffix = NULL;
 324
 325         const struct {
 326                 char *prefix;
 327                 int kind;
 328         } types[] = {
 329                 { PROF_PREFIX_PROFILE, PROF_PROFILE },
 330                 { PROF_PREFIX_TICK, PROF_TICK },
 331                 { 0, 0 }
 332         };
 333
 334         const struct {
 335                 char *name;
 336                 hrtime_t mult;
 337         } suffixes[] = {
 338                 { "ns",         NANOSEC / NANOSEC },
 339                 { "nsec",       NANOSEC / NANOSEC },
 340                 { "us",         NANOSEC / MICROSEC },
 341                 { "usec",       NANOSEC / MICROSEC },
 342                 { "ms",         NANOSEC / MILLISEC },
 343                 { "msec",       NANOSEC / MILLISEC },
 344                 { "s",          NANOSEC / SEC },
 345                 { "sec",        NANOSEC / SEC },
 346                 { "m",          NANOSEC * (hrtime_t)60 },
 347                 { "min",        NANOSEC * (hrtime_t)60 },
 348                 { "h",          NANOSEC * (hrtime_t)(60 * 60) },
 349                 { "hour",       NANOSEC * (hrtime_t)(60 * 60) },
 350                 { "d",          NANOSEC * (hrtime_t)(24 * 60 * 60) },
 351                 { "day",        NANOSEC * (hrtime_t)(24 * 60 * 60) },
 352                 { "hz",         0 },
 353                 { NULL }
 354         };
 355
 356         if (desc == NULL) {
 357                 char n[PROF_NAMELEN];
 358
 359                 /*
 360                  * If no description was provided, provide all of our probes.
 361                  */
 362                 for (i = 0; i < sizeof (profile_rates) / sizeof (int); i++) {
 363                         if ((rate = profile_rates[i]) == 0)
 364                                 continue;
 365
 366                         (void) snprintf(n, PROF_NAMELEN, "%s%d",
 367                             PROF_PREFIX_PROFILE, rate);
 368                         profile_create(NANOSEC / rate, n, PROF_PROFILE);
 369                 }
 370
 371                 for (i = 0; i < sizeof (profile_ticks) / sizeof (int); i++) {
 372                         if ((rate = profile_ticks[i]) == 0)
 373                                 continue;
 374
 375                         (void) snprintf(n, PROF_NAMELEN, "%s%d",
 376                             PROF_PREFIX_TICK, rate);
 377                         profile_create(NANOSEC / rate, n, PROF_TICK);
 378                 }
 379
 380                 return;
 381         }
 382
 383         name = desc->dtpd_name;
 384
 385         for (i = 0; types[i].prefix != NULL; i++) {
 386                 len = strlen(types[i].prefix);
 387
 388                 if (strncmp(name, types[i].prefix, len) != 0)
 389                         continue;
 390                 break;
 391         }
 392
 393         if (types[i].prefix == NULL)
 394                 return;
 395
 396         kind = types[i].kind;
 397         j = strlen(name) - len;
 398
 399         /*
 400          * We need to start before any time suffix.
 401          */
 402         for (j = strlen(name); j >= len; j--) {
 403                 if (name[j] >= '0' && name[j] <= '9')
 404                         break;
 405                 suffix = &name[j];
 406         }
 407
 408         ASSERT(suffix != NULL);
 409
 410         /*
 411          * Now determine the numerical value present in the probe name.
 412          */
 413         for (; j >= len; j--) {
 414                 if (name[j] < '0' || name[j] > '9')
 415                         return;
 416
 417                 val += (name[j] - '0') * mult;
 418                 mult *= (hrtime_t)10;
 419         }
 420
 421         if (val == 0)
 422                 return;
 423
 424         /*
 425          * Look-up the suffix to determine the multiplier.
 426          */
 427         for (i = 0, mult = 0; suffixes[i].name != NULL; i++) {
 428                 if (strcasecmp(suffixes[i].name, suffix) == 0) {
 429                         mult = suffixes[i].mult;
 430                         break;
 431                 }
 432         }
 433
 434         if (suffixes[i].name == NULL && *suffix != '\0')
 435                 return;
 436
 437         if (mult == 0) {
 438                 /*
 439                  * The default is frequency-per-second.
 440                  */
 441                 val = NANOSEC / val;
 442         } else {
 443                 val *= mult;
 444         }
 445
 446         profile_create(val, name, kind);
 447 }
 448
 449 /* ARGSUSED */
 450 static void
 451 profile_destroy(void *arg, dtrace_id_t id, void *parg)
 452 {
 453         profile_probe_t *prof = parg;
 454
 455 #ifdef illumos
 456         ASSERT(prof->prof_cyclic == CYCLIC_NONE);
 457 #else
 458         ASSERT(!callout_active(&prof->prof_cyclic) && prof->prof_pcpus == NULL);
 459 #endif
 460         kmem_free(prof, sizeof (profile_probe_t));
 461
 462         ASSERT(profile_total >= 1);
 463         atomic_add_32(&profile_total, -1);
 464 }
 465
 466 #ifdef illumos
 467 /*ARGSUSED*/
 468 static void
 469 profile_online(void *arg, cpu_t *cpu, cyc_handler_t *hdlr, cyc_time_t *when)
 470 {
 471         profile_probe_t *prof = arg;
 472         profile_probe_percpu_t *pcpu;
 473
 474         pcpu = kmem_zalloc(sizeof (profile_probe_percpu_t), KM_SLEEP);
 475         pcpu->profc_probe = prof;
 476
 477         hdlr->cyh_func = profile_fire;
 478         hdlr->cyh_arg = pcpu;
 479
 480         when->cyt_interval = prof->prof_interval;
 481         when->cyt_when = gethrtime() + when->cyt_interval;
 482
 483         pcpu->profc_expected = when->cyt_when;
 484         pcpu->profc_interval = when->cyt_interval;
 485 }
 486
 487 /*ARGSUSED*/
 488 static void
 489 profile_offline(void *arg, cpu_t *cpu, void *oarg)
 490 {
 491         profile_probe_percpu_t *pcpu = oarg;
 492
 493         ASSERT(pcpu->profc_probe == arg);
 494         kmem_free(pcpu, sizeof (profile_probe_percpu_t));
 495 }
 496
 497 /* ARGSUSED */
 498 static void
 499 profile_enable(void *arg, dtrace_id_t id, void *parg)
 500 {
 501         profile_probe_t *prof = parg;
 502         cyc_omni_handler_t omni;
 503         cyc_handler_t hdlr;
 504         cyc_time_t when;
 505
 506         ASSERT(prof->prof_interval != 0);
 507         ASSERT(MUTEX_HELD(&cpu_lock));
 508
 509         if (prof->prof_kind == PROF_TICK) {
 510                 hdlr.cyh_func = profile_tick;
 511                 hdlr.cyh_arg = prof;
 512
 513                 when.cyt_interval = prof->prof_interval;
 514                 when.cyt_when = gethrtime() + when.cyt_interval;
 515         } else {
 516                 ASSERT(prof->prof_kind == PROF_PROFILE);
 517                 omni.cyo_online = profile_online;
 518                 omni.cyo_offline = profile_offline;
 519                 omni.cyo_arg = prof;
 520         }
 521
 522         if (prof->prof_kind == PROF_TICK) {
 523                 prof->prof_cyclic = cyclic_add(&hdlr, &when);
 524         } else {
 525                 prof->prof_cyclic = cyclic_add_omni(&omni);
 526         }
 527 }
 528
 529 /* ARGSUSED */
 530 static void
 531 profile_disable(void *arg, dtrace_id_t id, void *parg)
 532 {
 533         profile_probe_t *prof = parg;
 534
 535         ASSERT(prof->prof_cyclic != CYCLIC_NONE);
 536         ASSERT(MUTEX_HELD(&cpu_lock));
 537
 538         cyclic_remove(prof->prof_cyclic);
 539         prof->prof_cyclic = CYCLIC_NONE;
 540 }
 541
 542 #else
 543
 544 static void
 545 profile_enable_omni(profile_probe_t *prof)
 546 {
 547         profile_probe_percpu_t *pcpu;
 548         int cpu;
 549
 550         prof->prof_pcpus = kmem_zalloc((mp_maxid + 1) * sizeof(pcpu), KM_SLEEP);
 551         CPU_FOREACH(cpu) {
 552                 pcpu = kmem_zalloc(sizeof(profile_probe_percpu_t), KM_SLEEP);
 553                 prof->prof_pcpus[cpu] = pcpu;
 554                 pcpu->profc_probe = prof;
 555                 pcpu->profc_expected = sbinuptime() + prof->prof_interval;
 556                 pcpu->profc_interval = prof->prof_interval;
 557                 callout_init(&pcpu->profc_cyclic, 1);
 558                 callout_reset_sbt_on(&pcpu->profc_cyclic,
 559                     pcpu->profc_expected, 0, profile_fire, pcpu,
 560                     cpu, C_DIRECT_EXEC | C_ABSOLUTE);
 561         }
 562 }
 563
 564 static void
 565 profile_disable_omni(profile_probe_t *prof)
 566 {
 567         profile_probe_percpu_t *pcpu;
 568         int cpu;
 569
 570         ASSERT(prof->prof_pcpus != NULL);
 571         CPU_FOREACH(cpu) {
 572                 pcpu = prof->prof_pcpus[cpu];
 573                 ASSERT(pcpu->profc_probe == prof);
 574                 ASSERT(callout_active(&pcpu->profc_cyclic));
 575                 callout_stop(&pcpu->profc_cyclic);
 576                 callout_drain(&pcpu->profc_cyclic);
 577                 kmem_free(pcpu, sizeof(profile_probe_percpu_t));
 578         }
 579         kmem_free(prof->prof_pcpus, (mp_maxid + 1) * sizeof(pcpu));
 580         prof->prof_pcpus = NULL;
 581 }
 582
 583 /* ARGSUSED */
 584 static void
 585 profile_enable(void *arg, dtrace_id_t id, void *parg)
 586 {
 587         profile_probe_t *prof = parg;
 588
 589         if (prof->prof_kind == PROF_TICK) {
 590                 prof->prof_expected = sbinuptime() + prof->prof_interval;
 591                 callout_reset_sbt(&prof->prof_cyclic,
 592                     prof->prof_expected, 0, profile_tick, prof,
 593                     C_DIRECT_EXEC | C_ABSOLUTE);
 594         } else {
 595                 ASSERT(prof->prof_kind == PROF_PROFILE);
 596                 profile_enable_omni(prof);
 597         }
 598 }
 599
 600 /* ARGSUSED */
 601 static void
 602 profile_disable(void *arg, dtrace_id_t id, void *parg)
 603 {
 604         profile_probe_t *prof = parg;
 605
 606         if (prof->prof_kind == PROF_TICK) {
 607                 ASSERT(callout_active(&prof->prof_cyclic));
 608                 callout_stop(&prof->prof_cyclic);
 609                 callout_drain(&prof->prof_cyclic);
 610         } else {
 611                 ASSERT(prof->prof_kind == PROF_PROFILE);
 612                 profile_disable_omni(prof);
 613         }
 614 }
 615 #endif
 616
 617 static void
 618 profile_load(void *dummy)
 619 {
 620         if (dtrace_register("profile", &profile_attr, DTRACE_PRIV_USER,
 621             NULL, &profile_pops, NULL, &profile_id) != 0)
 622                 return;
 623 }
 624
 625
 626 static int
 627 profile_unload(void)
 628 {
 629         int error = 0;
 630
 631         if ((error = dtrace_unregister(profile_id)) != 0)
 632                 return (error);
 633
 634         return (error);
 635 }
 636
 637 /* ARGSUSED */
 638 static int
 639 profile_modevent(module_t mod __unused, int type, void *data __unused)
 640 {
 641         int error = 0;
 642
 643         switch (type) {
 644         case MOD_LOAD:
 645                 break;
 646
 647         case MOD_UNLOAD:
 648                 break;
 649
 650         case MOD_SHUTDOWN:
 651                 break;
 652
 653         default:
 654                 error = EOPNOTSUPP;
 655                 break;
 656
 657         }
 658         return (error);
 659 }
 660
 661 SYSINIT(profile_load, SI_SUB_DTRACE_PROVIDER, SI_ORDER_ANY, profile_load, NULL);
 662 SYSUNINIT(profile_unload, SI_SUB_DTRACE_PROVIDER, SI_ORDER_ANY, profile_unload, NULL);
 663
 664 DEV_MODULE(profile, profile_modevent, NULL);
 665 MODULE_VERSION(profile, 1);
 666 MODULE_DEPEND(profile, dtrace, 1, 1, 1);
 667 MODULE_DEPEND(profile, opensolaris, 1, 1, 1);