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 __mips
 101 /*
 102  * This value is bogus just to make module compilable on mips
 103  */
 104 #define PROF_ARTIFICIAL_FRAMES  3
 105 #endif
 106
 107 #ifdef __powerpc__
 108 /*
 109  * This value is bogus just to make module compilable on powerpc
 110  */
 111 #define PROF_ARTIFICIAL_FRAMES  3
 112 #endif
 113
 114 struct profile_probe_percpu;
 115
 116 #ifdef __mips
 117 /* bogus */
 118 #define PROF_ARTIFICIAL_FRAMES  3
 119 #endif
 120
 121 #ifdef __arm__
 122 #define PROF_ARTIFICIAL_FRAMES  3
 123 #endif
 124
 125 #ifdef __aarch64__
 126 #define PROF_ARTIFICIAL_FRAMES  12
 127 #endif
 128
 129 #ifdef __riscv
 130 /* TODO: verify */
 131 #define PROF_ARTIFICIAL_FRAMES  10
 132 #endif
 133
 134 typedef struct profile_probe {
 135         char            prof_name[PROF_NAMELEN];
 136         dtrace_id_t     prof_id;
 137         int             prof_kind;
 138 #ifdef illumos
 139         hrtime_t        prof_interval;
 140         cyclic_id_t     prof_cyclic;
 141 #else
 142         sbintime_t      prof_interval;
 143         struct callout  prof_cyclic;
 144         sbintime_t      prof_expected;
 145         struct profile_probe_percpu **prof_pcpus;
 146 #endif
 147 } profile_probe_t;
 148
 149 typedef struct profile_probe_percpu {
 150         hrtime_t        profc_expected;
 151         hrtime_t        profc_interval;
 152         profile_probe_t *profc_probe;
 153 #ifdef __FreeBSD__
 154         struct callout  profc_cyclic;
 155 #endif
 156 } profile_probe_percpu_t;
 157
 158 static d_open_t profile_open;
 159 static int      profile_unload(void);
 160 static void     profile_create(hrtime_t, char *, int);
 161 static void     profile_destroy(void *, dtrace_id_t, void *);
 162 static void     profile_enable(void *, dtrace_id_t, void *);
 163 static void     profile_disable(void *, dtrace_id_t, void *);
 164 static void     profile_load(void *);
 165 static void     profile_provide(void *, dtrace_probedesc_t *);
 166
 167 static int profile_rates[] = {
 168     97, 199, 499, 997, 1999,
 169     4001, 4999, 0, 0, 0,
 170     0, 0, 0, 0, 0,
 171     0, 0, 0, 0, 0
 172 };
 173
 174 static int profile_ticks[] = {
 175     1, 10, 100, 500, 1000,
 176     5000, 0, 0, 0, 0,
 177     0, 0, 0, 0, 0
 178 };
 179
 180 /*
 181  * profile_max defines the upper bound on the number of profile probes that
 182  * can exist (this is to prevent malicious or clumsy users from exhausing
 183  * system resources by creating a slew of profile probes). At mod load time,
 184  * this gets its value from PROFILE_MAX_DEFAULT or profile-max-probes if it's
 185  * present in the profile.conf file.
 186  */
 187 #define PROFILE_MAX_DEFAULT     1000    /* default max. number of probes */
 188 static uint32_t profile_max = PROFILE_MAX_DEFAULT;
 189                                         /* maximum number of profile probes */
 190 static uint32_t profile_total;          /* current number of profile probes */
 191
 192 static struct cdevsw profile_cdevsw = {
 193         .d_version      = D_VERSION,
 194         .d_open         = profile_open,
 195         .d_name         = "profile",
 196 };
 197
 198 static dtrace_pattr_t profile_attr = {
 199 { DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_COMMON },
 200 { DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN },
 201 { DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_ISA },
 202 { DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_COMMON },
 203 { DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_ISA },
 204 };
 205
 206 static dtrace_pops_t profile_pops = {
 207         .dtps_provide =         profile_provide,
 208         .dtps_provide_module =  NULL,
 209         .dtps_enable =          profile_enable,
 210         .dtps_disable =         profile_disable,
 211         .dtps_suspend =         NULL,
 212         .dtps_resume =          NULL,
 213         .dtps_getargdesc =      NULL,
 214         .dtps_getargval =       NULL,
 215         .dtps_usermode =        NULL,
 216         .dtps_destroy =         profile_destroy
 217 };
 218
 219 static struct cdev              *profile_cdev;
 220 static dtrace_provider_id_t     profile_id;
 221 static hrtime_t                 profile_interval_min = NANOSEC / 5000;  /* 5000 hz */
 222 static int                      profile_aframes = PROF_ARTIFICIAL_FRAMES;
 223
 224 SYSCTL_DECL(_kern_dtrace);
 225 SYSCTL_NODE(_kern_dtrace, OID_AUTO, profile, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
 226     "DTrace profile parameters");
 227 SYSCTL_INT(_kern_dtrace_profile, OID_AUTO, aframes, CTLFLAG_RW, &profile_aframes,
 228     0, "Skipped frames for profile provider");
 229
 230 static sbintime_t
 231 nsec_to_sbt(hrtime_t nsec)
 232 {
 233         time_t sec;
 234
 235         /*
 236          * We need to calculate nsec * 2^32 / 10^9
 237          * Seconds and nanoseconds are split to avoid overflow.
 238          */
 239         sec = nsec / NANOSEC;
 240         nsec = nsec % NANOSEC;
 241         return (((sbintime_t)sec << 32) | ((sbintime_t)nsec << 32) / NANOSEC);
 242 }
 243
 244 static hrtime_t
 245 sbt_to_nsec(sbintime_t sbt)
 246 {
 247
 248         return ((sbt >> 32) * NANOSEC +
 249             (((uint32_t)sbt * (hrtime_t)NANOSEC) >> 32));
 250 }
 251
 252 static void
 253 profile_probe(profile_probe_t *prof, hrtime_t late)
 254 {
 255         struct thread *td;
 256         struct trapframe *frame;
 257         uintfptr_t pc, upc;
 258
 259         td = curthread;
 260         pc = upc = 0;
 261
 262         /*
 263          * td_intr_frame can be unset if this is a catch-up event upon waking up
 264          * from idle sleep. This can only happen on a CPU idle thread. Use a
 265          * representative arg0 value in this case so that one of the probe
 266          * arguments is non-zero.
 267          */
 268         frame = td->td_intr_frame;
 269         if (frame != NULL) {
 270                 if (TRAPF_USERMODE(frame))
 271                         upc = TRAPF_PC(frame);
 272                 else
 273                         pc = TRAPF_PC(frame);
 274         } else if (TD_IS_IDLETHREAD(td))
 275                 pc = (uintfptr_t)&cpu_idle;
 276
 277         dtrace_probe(prof->prof_id, pc, upc, late, 0, 0);
 278 }
 279
 280 static void
 281 profile_fire(void *arg)
 282 {
 283         profile_probe_percpu_t *pcpu = arg;
 284         profile_probe_t *prof = pcpu->profc_probe;
 285         hrtime_t late;
 286
 287         late = sbt_to_nsec(sbinuptime() - pcpu->profc_expected);
 288
 289         profile_probe(prof, late);
 290         pcpu->profc_expected += pcpu->profc_interval;
 291         callout_schedule_sbt_curcpu(&pcpu->profc_cyclic,
 292             pcpu->profc_expected, 0, C_DIRECT_EXEC | C_ABSOLUTE);
 293 }
 294
 295 static void
 296 profile_tick(void *arg)
 297 {
 298         profile_probe_t *prof = arg;
 299
 300         profile_probe(prof, 0);
 301         prof->prof_expected += prof->prof_interval;
 302         callout_schedule_sbt(&prof->prof_cyclic,
 303             prof->prof_expected, 0, C_DIRECT_EXEC | C_ABSOLUTE);
 304 }
 305
 306 static void
 307 profile_create(hrtime_t interval, char *name, int kind)
 308 {
 309         profile_probe_t *prof;
 310
 311         if (interval < profile_interval_min)
 312                 return;
 313
 314         if (dtrace_probe_lookup(profile_id, NULL, NULL, name) != 0)
 315                 return;
 316
 317         atomic_add_32(&profile_total, 1);
 318         if (profile_total > profile_max) {
 319                 atomic_add_32(&profile_total, -1);
 320                 return;
 321         }
 322
 323         prof = kmem_zalloc(sizeof (profile_probe_t), KM_SLEEP);
 324         (void) strcpy(prof->prof_name, name);
 325 #ifdef illumos
 326         prof->prof_interval = interval;
 327         prof->prof_cyclic = CYCLIC_NONE;
 328 #else
 329         prof->prof_interval = nsec_to_sbt(interval);
 330         callout_init(&prof->prof_cyclic, 1);
 331 #endif
 332         prof->prof_kind = kind;
 333         prof->prof_id = dtrace_probe_create(profile_id,
 334             NULL, NULL, name,
 335             profile_aframes, prof);
 336 }
 337
 338 /*ARGSUSED*/
 339 static void
 340 profile_provide(void *arg, dtrace_probedesc_t *desc)
 341 {
 342         int i, j, rate, kind;
 343         hrtime_t val = 0, mult = 1, len = 0;
 344         char *name, *suffix = NULL;
 345
 346         const struct {
 347                 char *prefix;
 348                 int kind;
 349         } types[] = {
 350                 { PROF_PREFIX_PROFILE, PROF_PROFILE },
 351                 { PROF_PREFIX_TICK, PROF_TICK },
 352                 { 0, 0 }
 353         };
 354
 355         const struct {
 356                 char *name;
 357                 hrtime_t mult;
 358         } suffixes[] = {
 359                 { "ns",         NANOSEC / NANOSEC },
 360                 { "nsec",       NANOSEC / NANOSEC },
 361                 { "us",         NANOSEC / MICROSEC },
 362                 { "usec",       NANOSEC / MICROSEC },
 363                 { "ms",         NANOSEC / MILLISEC },
 364                 { "msec",       NANOSEC / MILLISEC },
 365                 { "s",          NANOSEC / SEC },
 366                 { "sec",        NANOSEC / SEC },
 367                 { "m",          NANOSEC * (hrtime_t)60 },
 368                 { "min",        NANOSEC * (hrtime_t)60 },
 369                 { "h",          NANOSEC * (hrtime_t)(60 * 60) },
 370                 { "hour",       NANOSEC * (hrtime_t)(60 * 60) },
 371                 { "d",          NANOSEC * (hrtime_t)(24 * 60 * 60) },
 372                 { "day",        NANOSEC * (hrtime_t)(24 * 60 * 60) },
 373                 { "hz",         0 },
 374                 { NULL }
 375         };
 376
 377         if (desc == NULL) {
 378                 char n[PROF_NAMELEN];
 379
 380                 /*
 381                  * If no description was provided, provide all of our probes.
 382                  */
 383                 for (i = 0; i < sizeof (profile_rates) / sizeof (int); i++) {
 384                         if ((rate = profile_rates[i]) == 0)
 385                                 continue;
 386
 387                         (void) snprintf(n, PROF_NAMELEN, "%s%d",
 388                             PROF_PREFIX_PROFILE, rate);
 389                         profile_create(NANOSEC / rate, n, PROF_PROFILE);
 390                 }
 391
 392                 for (i = 0; i < sizeof (profile_ticks) / sizeof (int); i++) {
 393                         if ((rate = profile_ticks[i]) == 0)
 394                                 continue;
 395
 396                         (void) snprintf(n, PROF_NAMELEN, "%s%d",
 397                             PROF_PREFIX_TICK, rate);
 398                         profile_create(NANOSEC / rate, n, PROF_TICK);
 399                 }
 400
 401                 return;
 402         }
 403
 404         name = desc->dtpd_name;
 405
 406         for (i = 0; types[i].prefix != NULL; i++) {
 407                 len = strlen(types[i].prefix);
 408
 409                 if (strncmp(name, types[i].prefix, len) != 0)
 410                         continue;
 411                 break;
 412         }
 413
 414         if (types[i].prefix == NULL)
 415                 return;
 416
 417         kind = types[i].kind;
 418         j = strlen(name) - len;
 419
 420         /*
 421          * We need to start before any time suffix.
 422          */
 423         for (j = strlen(name); j >= len; j--) {
 424                 if (name[j] >= '0' && name[j] <= '9')
 425                         break;
 426                 suffix = &name[j];
 427         }
 428
 429         ASSERT(suffix != NULL);
 430
 431         /*
 432          * Now determine the numerical value present in the probe name.
 433          */
 434         for (; j >= len; j--) {
 435                 if (name[j] < '0' || name[j] > '9')
 436                         return;
 437
 438                 val += (name[j] - '0') * mult;
 439                 mult *= (hrtime_t)10;
 440         }
 441
 442         if (val == 0)
 443                 return;
 444
 445         /*
 446          * Look-up the suffix to determine the multiplier.
 447          */
 448         for (i = 0, mult = 0; suffixes[i].name != NULL; i++) {
 449                 if (strcasecmp(suffixes[i].name, suffix) == 0) {
 450                         mult = suffixes[i].mult;
 451                         break;
 452                 }
 453         }
 454
 455         if (suffixes[i].name == NULL && *suffix != '\0')
 456                 return;
 457
 458         if (mult == 0) {
 459                 /*
 460                  * The default is frequency-per-second.
 461                  */
 462                 val = NANOSEC / val;
 463         } else {
 464                 val *= mult;
 465         }
 466
 467         profile_create(val, name, kind);
 468 }
 469
 470 /* ARGSUSED */
 471 static void
 472 profile_destroy(void *arg, dtrace_id_t id, void *parg)
 473 {
 474         profile_probe_t *prof = parg;
 475
 476 #ifdef illumos
 477         ASSERT(prof->prof_cyclic == CYCLIC_NONE);
 478 #else
 479         ASSERT(!callout_active(&prof->prof_cyclic) && prof->prof_pcpus == NULL);
 480 #endif
 481         kmem_free(prof, sizeof (profile_probe_t));
 482
 483         ASSERT(profile_total >= 1);
 484         atomic_add_32(&profile_total, -1);
 485 }
 486
 487 #ifdef illumos
 488 /*ARGSUSED*/
 489 static void
 490 profile_online(void *arg, cpu_t *cpu, cyc_handler_t *hdlr, cyc_time_t *when)
 491 {
 492         profile_probe_t *prof = arg;
 493         profile_probe_percpu_t *pcpu;
 494
 495         pcpu = kmem_zalloc(sizeof (profile_probe_percpu_t), KM_SLEEP);
 496         pcpu->profc_probe = prof;
 497
 498         hdlr->cyh_func = profile_fire;
 499         hdlr->cyh_arg = pcpu;
 500
 501         when->cyt_interval = prof->prof_interval;
 502         when->cyt_when = gethrtime() + when->cyt_interval;
 503
 504         pcpu->profc_expected = when->cyt_when;
 505         pcpu->profc_interval = when->cyt_interval;
 506 }
 507
 508 /*ARGSUSED*/
 509 static void
 510 profile_offline(void *arg, cpu_t *cpu, void *oarg)
 511 {
 512         profile_probe_percpu_t *pcpu = oarg;
 513
 514         ASSERT(pcpu->profc_probe == arg);
 515         kmem_free(pcpu, sizeof (profile_probe_percpu_t));
 516 }
 517
 518 /* ARGSUSED */
 519 static void
 520 profile_enable(void *arg, dtrace_id_t id, void *parg)
 521 {
 522         profile_probe_t *prof = parg;
 523         cyc_omni_handler_t omni;
 524         cyc_handler_t hdlr;
 525         cyc_time_t when;
 526
 527         ASSERT(prof->prof_interval != 0);
 528         ASSERT(MUTEX_HELD(&cpu_lock));
 529
 530         if (prof->prof_kind == PROF_TICK) {
 531                 hdlr.cyh_func = profile_tick;
 532                 hdlr.cyh_arg = prof;
 533
 534                 when.cyt_interval = prof->prof_interval;
 535                 when.cyt_when = gethrtime() + when.cyt_interval;
 536         } else {
 537                 ASSERT(prof->prof_kind == PROF_PROFILE);
 538                 omni.cyo_online = profile_online;
 539                 omni.cyo_offline = profile_offline;
 540                 omni.cyo_arg = prof;
 541         }
 542
 543         if (prof->prof_kind == PROF_TICK) {
 544                 prof->prof_cyclic = cyclic_add(&hdlr, &when);
 545         } else {
 546                 prof->prof_cyclic = cyclic_add_omni(&omni);
 547         }
 548 }
 549
 550 /* ARGSUSED */
 551 static void
 552 profile_disable(void *arg, dtrace_id_t id, void *parg)
 553 {
 554         profile_probe_t *prof = parg;
 555
 556         ASSERT(prof->prof_cyclic != CYCLIC_NONE);
 557         ASSERT(MUTEX_HELD(&cpu_lock));
 558
 559         cyclic_remove(prof->prof_cyclic);
 560         prof->prof_cyclic = CYCLIC_NONE;
 561 }
 562
 563 #else
 564
 565 static void
 566 profile_enable_omni(profile_probe_t *prof)
 567 {
 568         profile_probe_percpu_t *pcpu;
 569         int cpu;
 570
 571         prof->prof_pcpus = kmem_zalloc((mp_maxid + 1) * sizeof(pcpu), KM_SLEEP);
 572         CPU_FOREACH(cpu) {
 573                 pcpu = kmem_zalloc(sizeof(profile_probe_percpu_t), KM_SLEEP);
 574                 prof->prof_pcpus[cpu] = pcpu;
 575                 pcpu->profc_probe = prof;
 576                 pcpu->profc_expected = sbinuptime() + prof->prof_interval;
 577                 pcpu->profc_interval = prof->prof_interval;
 578                 callout_init(&pcpu->profc_cyclic, 1);
 579                 callout_reset_sbt_on(&pcpu->profc_cyclic,
 580                     pcpu->profc_expected, 0, profile_fire, pcpu,
 581                     cpu, C_DIRECT_EXEC | C_ABSOLUTE);
 582         }
 583 }
 584
 585 static void
 586 profile_disable_omni(profile_probe_t *prof)
 587 {
 588         profile_probe_percpu_t *pcpu;
 589         int cpu;
 590
 591         ASSERT(prof->prof_pcpus != NULL);
 592         CPU_FOREACH(cpu) {
 593                 pcpu = prof->prof_pcpus[cpu];
 594                 ASSERT(pcpu->profc_probe == prof);
 595                 ASSERT(callout_active(&pcpu->profc_cyclic));
 596                 callout_stop(&pcpu->profc_cyclic);
 597                 callout_drain(&pcpu->profc_cyclic);
 598                 kmem_free(pcpu, sizeof(profile_probe_percpu_t));
 599         }
 600         kmem_free(prof->prof_pcpus, (mp_maxid + 1) * sizeof(pcpu));
 601         prof->prof_pcpus = NULL;
 602 }
 603
 604 /* ARGSUSED */
 605 static void
 606 profile_enable(void *arg, dtrace_id_t id, void *parg)
 607 {
 608         profile_probe_t *prof = parg;
 609
 610         if (prof->prof_kind == PROF_TICK) {
 611                 prof->prof_expected = sbinuptime() + prof->prof_interval;
 612                 callout_reset_sbt(&prof->prof_cyclic,
 613                     prof->prof_expected, 0, profile_tick, prof,
 614                     C_DIRECT_EXEC | C_ABSOLUTE);
 615         } else {
 616                 ASSERT(prof->prof_kind == PROF_PROFILE);
 617                 profile_enable_omni(prof);
 618         }
 619 }
 620
 621 /* ARGSUSED */
 622 static void
 623 profile_disable(void *arg, dtrace_id_t id, void *parg)
 624 {
 625         profile_probe_t *prof = parg;
 626
 627         if (prof->prof_kind == PROF_TICK) {
 628                 ASSERT(callout_active(&prof->prof_cyclic));
 629                 callout_stop(&prof->prof_cyclic);
 630                 callout_drain(&prof->prof_cyclic);
 631         } else {
 632                 ASSERT(prof->prof_kind == PROF_PROFILE);
 633                 profile_disable_omni(prof);
 634         }
 635 }
 636 #endif
 637
 638 static void
 639 profile_load(void *dummy)
 640 {
 641         /* Create the /dev/dtrace/profile entry. */
 642         profile_cdev = make_dev(&profile_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600,
 643             "dtrace/profile");
 644
 645         if (dtrace_register("profile", &profile_attr, DTRACE_PRIV_USER,
 646             NULL, &profile_pops, NULL, &profile_id) != 0)
 647                 return;
 648 }
 649
 650
 651 static int
 652 profile_unload()
 653 {
 654         int error = 0;
 655
 656         if ((error = dtrace_unregister(profile_id)) != 0)
 657                 return (error);
 658
 659         destroy_dev(profile_cdev);
 660
 661         return (error);
 662 }
 663
 664 /* ARGSUSED */
 665 static int
 666 profile_modevent(module_t mod __unused, int type, void *data __unused)
 667 {
 668         int error = 0;
 669
 670         switch (type) {
 671         case MOD_LOAD:
 672                 break;
 673
 674         case MOD_UNLOAD:
 675                 break;
 676
 677         case MOD_SHUTDOWN:
 678                 break;
 679
 680         default:
 681                 error = EOPNOTSUPP;
 682                 break;
 683
 684         }
 685         return (error);
 686 }
 687
 688 /* ARGSUSED */
 689 static int
 690 profile_open(struct cdev *dev __unused, int oflags __unused, int devtype __unused, struct thread *td __unused)
 691 {
 692         return (0);
 693 }
 694
 695 SYSINIT(profile_load, SI_SUB_DTRACE_PROVIDER, SI_ORDER_ANY, profile_load, NULL);
 696 SYSUNINIT(profile_unload, SI_SUB_DTRACE_PROVIDER, SI_ORDER_ANY, profile_unload, NULL);
 697
 698 DEV_MODULE(profile, profile_modevent, NULL);
 699 MODULE_VERSION(profile, 1);
 700 MODULE_DEPEND(profile, dtrace, 1, 1, 1);
 701 MODULE_DEPEND(profile, opensolaris, 1, 1, 1);