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/fcntl.h>
  38 #include <sys/filio.h>
  39 #include <sys/kdb.h>
  40 #include <sys/kernel.h>
  41 #include <sys/kmem.h>
  42 #include <sys/kthread.h>
  43 #include <sys/limits.h>
  44 #include <sys/linker.h>
  45 #include <sys/lock.h>
  46 #include <sys/malloc.h>
  47 #include <sys/module.h>
  48 #include <sys/mutex.h>
  49 #include <sys/poll.h>
  50 #include <sys/proc.h>
  51 #include <sys/selinfo.h>
  52 #include <sys/smp.h>
  53 #include <sys/sysctl.h>
  54 #include <sys/uio.h>
  55 #include <sys/unistd.h>
  56 #include <machine/cpu.h>
  57 #include <machine/stdarg.h>
  58
  59 #include <sys/dtrace.h>
  60 #include <sys/dtrace_bsd.h>
  61
  62 #define PROF_NAMELEN            15
  63
  64 #define PROF_PROFILE            0
  65 #define PROF_TICK               1
  66 #define PROF_PREFIX_PROFILE     "profile-"
  67 #define PROF_PREFIX_TICK        "tick-"
  68
  69 /*
  70  * Regardless of platform, there are five artificial frames in the case of the
  71  * profile provider:
  72  *
  73  *      profile_fire
  74  *      cyclic_expire
  75  *      cyclic_fire
  76  *      [ cbe ]
  77  *      [ locore ]
  78  *
  79  * On amd64, there are two frames associated with locore:  one in locore, and
  80  * another in common interrupt dispatch code.  (i386 has not been modified to
  81  * use this common layer.)  Further, on i386, the interrupted instruction
  82  * appears as its own stack frame.  All of this means that we need to add one
  83  * frame for amd64, and then take one away for both amd64 and i386.
  84  *
  85  * On SPARC, the picture is further complicated because the compiler
  86  * optimizes away tail-calls -- so the following frames are optimized away:
  87  *
  88  *      profile_fire
  89  *      cyclic_expire
  90  *
  91  * This gives three frames.  However, on DEBUG kernels, the cyclic_expire
  92  * frame cannot be tail-call eliminated, yielding four frames in this case.
  93  *
  94  * All of the above constraints lead to the mess below.  Yes, the profile
  95  * provider should ideally figure this out on-the-fly by hiting one of its own
  96  * probes and then walking its own stack trace.  This is complicated, however,
  97  * and the static definition doesn't seem to be overly brittle.  Still, we
  98  * allow for a manual override in case we get it completely wrong.
  99  */
 100 #ifdef __amd64
 101 #define PROF_ARTIFICIAL_FRAMES  10
 102 #else
 103 #ifdef __i386
 104 #define PROF_ARTIFICIAL_FRAMES  6
 105 #else
 106 #ifdef __sparc
 107 #ifdef DEBUG
 108 #define PROF_ARTIFICIAL_FRAMES  4
 109 #else
 110 #define PROF_ARTIFICIAL_FRAMES  3
 111 #endif
 112 #endif
 113 #endif
 114 #endif
 115
 116 #ifdef __mips
 117 /*
 118  * This value is bogus just to make module compilable on mips
 119  */
 120 #define PROF_ARTIFICIAL_FRAMES  3
 121 #endif
 122
 123 #ifdef __powerpc__
 124 /*
 125  * This value is bogus just to make module compilable on powerpc
 126  */
 127 #define PROF_ARTIFICIAL_FRAMES  3
 128 #endif
 129
 130 struct profile_probe_percpu;
 131
 132 #ifdef __mips
 133 /* bogus */
 134 #define PROF_ARTIFICIAL_FRAMES  3
 135 #endif
 136
 137 #ifdef __arm__
 138 #define PROF_ARTIFICIAL_FRAMES  3
 139 #endif
 140
 141 #ifdef __aarch64__
 142 /* TODO: verify */
 143 #define PROF_ARTIFICIAL_FRAMES  10
 144 #endif
 145
 146 #ifdef __riscv
 147 /* TODO: verify */
 148 #define PROF_ARTIFICIAL_FRAMES  10
 149 #endif
 150
 151 typedef struct profile_probe {
 152         char            prof_name[PROF_NAMELEN];
 153         dtrace_id_t     prof_id;
 154         int             prof_kind;
 155 #ifdef illumos
 156         hrtime_t        prof_interval;
 157         cyclic_id_t     prof_cyclic;
 158 #else
 159         sbintime_t      prof_interval;
 160         struct callout  prof_cyclic;
 161         sbintime_t      prof_expected;
 162         struct profile_probe_percpu **prof_pcpus;
 163 #endif
 164 } profile_probe_t;
 165
 166 typedef struct profile_probe_percpu {
 167         hrtime_t        profc_expected;
 168         hrtime_t        profc_interval;
 169         profile_probe_t *profc_probe;
 170 #ifdef __FreeBSD__
 171         struct callout  profc_cyclic;
 172 #endif
 173 } profile_probe_percpu_t;
 174
 175 static d_open_t profile_open;
 176 static int      profile_unload(void);
 177 static void     profile_create(hrtime_t, char *, int);
 178 static void     profile_destroy(void *, dtrace_id_t, void *);
 179 static void     profile_enable(void *, dtrace_id_t, void *);
 180 static void     profile_disable(void *, dtrace_id_t, void *);
 181 static void     profile_load(void *);
 182 static void     profile_provide(void *, dtrace_probedesc_t *);
 183
 184 static int profile_rates[] = {
 185     97, 199, 499, 997, 1999,
 186     4001, 4999, 0, 0, 0,
 187     0, 0, 0, 0, 0,
 188     0, 0, 0, 0, 0
 189 };
 190
 191 static int profile_ticks[] = {
 192     1, 10, 100, 500, 1000,
 193     5000, 0, 0, 0, 0,
 194     0, 0, 0, 0, 0
 195 };
 196
 197 /*
 198  * profile_max defines the upper bound on the number of profile probes that
 199  * can exist (this is to prevent malicious or clumsy users from exhausing
 200  * system resources by creating a slew of profile probes). At mod load time,
 201  * this gets its value from PROFILE_MAX_DEFAULT or profile-max-probes if it's
 202  * present in the profile.conf file.
 203  */
 204 #define PROFILE_MAX_DEFAULT     1000    /* default max. number of probes */
 205 static uint32_t profile_max = PROFILE_MAX_DEFAULT;
 206                                         /* maximum number of profile probes */
 207 static uint32_t profile_total;          /* current number of profile probes */
 208
 209 static struct cdevsw profile_cdevsw = {
 210         .d_version      = D_VERSION,
 211         .d_open         = profile_open,
 212         .d_name         = "profile",
 213 };
 214
 215 static dtrace_pattr_t profile_attr = {
 216 { DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_COMMON },
 217 { DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN },
 218 { DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_ISA },
 219 { DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_COMMON },
 220 { DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_ISA },
 221 };
 222
 223 static dtrace_pops_t profile_pops = {
 224         .dtps_provide =         profile_provide,
 225         .dtps_provide_module =  NULL,
 226         .dtps_enable =          profile_enable,
 227         .dtps_disable =         profile_disable,
 228         .dtps_suspend =         NULL,
 229         .dtps_resume =          NULL,
 230         .dtps_getargdesc =      NULL,
 231         .dtps_getargval =       NULL,
 232         .dtps_usermode =        NULL,
 233         .dtps_destroy =         profile_destroy
 234 };
 235
 236 static struct cdev              *profile_cdev;
 237 static dtrace_provider_id_t     profile_id;
 238 static hrtime_t                 profile_interval_min = NANOSEC / 5000;  /* 5000 hz */
 239 static int                      profile_aframes = PROF_ARTIFICIAL_FRAMES;
 240
 241 SYSCTL_DECL(_kern_dtrace);
 242 SYSCTL_NODE(_kern_dtrace, OID_AUTO, profile, CTLFLAG_RD, 0, "DTrace profile parameters");
 243 SYSCTL_INT(_kern_dtrace_profile, OID_AUTO, aframes, CTLFLAG_RW, &profile_aframes,
 244     0, "Skipped frames for profile provider");
 245
 246 static sbintime_t
 247 nsec_to_sbt(hrtime_t nsec)
 248 {
 249         time_t sec;
 250
 251         /*
 252          * We need to calculate nsec * 2^32 / 10^9
 253          * Seconds and nanoseconds are split to avoid overflow.
 254          */
 255         sec = nsec / NANOSEC;
 256         nsec = nsec % NANOSEC;
 257         return (((sbintime_t)sec << 32) | ((sbintime_t)nsec << 32) / NANOSEC);
 258 }
 259
 260 static hrtime_t
 261 sbt_to_nsec(sbintime_t sbt)
 262 {
 263
 264         return ((sbt >> 32) * NANOSEC +
 265             (((uint32_t)sbt * (hrtime_t)NANOSEC) >> 32));
 266 }
 267
 268 static void
 269 profile_probe(profile_probe_t *prof, hrtime_t late)
 270 {
 271         struct thread *td;
 272         struct trapframe *frame;
 273         uintfptr_t pc, upc;
 274
 275         td = curthread;
 276         pc = upc = 0;
 277
 278         /*
 279          * td_intr_frame can be unset if this is a catch-up event upon waking up
 280          * from idle sleep. This can only happen on a CPU idle thread. Use a
 281          * representative arg0 value in this case so that one of the probe
 282          * arguments is non-zero.
 283          */
 284         frame = td->td_intr_frame;
 285         if (frame != NULL) {
 286                 if (TRAPF_USERMODE(frame))
 287                         upc = TRAPF_PC(frame);
 288                 else
 289                         pc = TRAPF_PC(frame);
 290         } else if (TD_IS_IDLETHREAD(td))
 291                 pc = (uintfptr_t)&cpu_idle;
 292
 293         dtrace_probe(prof->prof_id, pc, upc, late, 0, 0);
 294 }
 295
 296 static void
 297 profile_fire(void *arg)
 298 {
 299         profile_probe_percpu_t *pcpu = arg;
 300         profile_probe_t *prof = pcpu->profc_probe;
 301         hrtime_t late;
 302
 303         late = sbt_to_nsec(sbinuptime() - pcpu->profc_expected);
 304
 305         profile_probe(prof, late);
 306         pcpu->profc_expected += pcpu->profc_interval;
 307         callout_schedule_sbt_curcpu(&pcpu->profc_cyclic,
 308             pcpu->profc_expected, 0, C_DIRECT_EXEC | C_ABSOLUTE);
 309 }
 310
 311 static void
 312 profile_tick(void *arg)
 313 {
 314         profile_probe_t *prof = arg;
 315
 316         profile_probe(prof, 0);
 317         prof->prof_expected += prof->prof_interval;
 318         callout_schedule_sbt(&prof->prof_cyclic,
 319             prof->prof_expected, 0, C_DIRECT_EXEC | C_ABSOLUTE);
 320 }
 321
 322 static void
 323 profile_create(hrtime_t interval, char *name, int kind)
 324 {
 325         profile_probe_t *prof;
 326
 327         if (interval < profile_interval_min)
 328                 return;
 329
 330         if (dtrace_probe_lookup(profile_id, NULL, NULL, name) != 0)
 331                 return;
 332
 333         atomic_add_32(&profile_total, 1);
 334         if (profile_total > profile_max) {
 335                 atomic_add_32(&profile_total, -1);
 336                 return;
 337         }
 338
 339         prof = kmem_zalloc(sizeof (profile_probe_t), KM_SLEEP);
 340         (void) strcpy(prof->prof_name, name);
 341 #ifdef illumos
 342         prof->prof_interval = interval;
 343         prof->prof_cyclic = CYCLIC_NONE;
 344 #else
 345         prof->prof_interval = nsec_to_sbt(interval);
 346         callout_init(&prof->prof_cyclic, 1);
 347 #endif
 348         prof->prof_kind = kind;
 349         prof->prof_id = dtrace_probe_create(profile_id,
 350             NULL, NULL, name,
 351             profile_aframes, prof);
 352 }
 353
 354 /*ARGSUSED*/
 355 static void
 356 profile_provide(void *arg, dtrace_probedesc_t *desc)
 357 {
 358         int i, j, rate, kind;
 359         hrtime_t val = 0, mult = 1, len = 0;
 360         char *name, *suffix = NULL;
 361
 362         const struct {
 363                 char *prefix;
 364                 int kind;
 365         } types[] = {
 366                 { PROF_PREFIX_PROFILE, PROF_PROFILE },
 367                 { PROF_PREFIX_TICK, PROF_TICK },
 368                 { 0, 0 }
 369         };
 370
 371         const struct {
 372                 char *name;
 373                 hrtime_t mult;
 374         } suffixes[] = {
 375                 { "ns",         NANOSEC / NANOSEC },
 376                 { "nsec",       NANOSEC / NANOSEC },
 377                 { "us",         NANOSEC / MICROSEC },
 378                 { "usec",       NANOSEC / MICROSEC },
 379                 { "ms",         NANOSEC / MILLISEC },
 380                 { "msec",       NANOSEC / MILLISEC },
 381                 { "s",          NANOSEC / SEC },
 382                 { "sec",        NANOSEC / SEC },
 383                 { "m",          NANOSEC * (hrtime_t)60 },
 384                 { "min",        NANOSEC * (hrtime_t)60 },
 385                 { "h",          NANOSEC * (hrtime_t)(60 * 60) },
 386                 { "hour",       NANOSEC * (hrtime_t)(60 * 60) },
 387                 { "d",          NANOSEC * (hrtime_t)(24 * 60 * 60) },
 388                 { "day",        NANOSEC * (hrtime_t)(24 * 60 * 60) },
 389                 { "hz",         0 },
 390                 { NULL }
 391         };
 392
 393         if (desc == NULL) {
 394                 char n[PROF_NAMELEN];
 395
 396                 /*
 397                  * If no description was provided, provide all of our probes.
 398                  */
 399                 for (i = 0; i < sizeof (profile_rates) / sizeof (int); i++) {
 400                         if ((rate = profile_rates[i]) == 0)
 401                                 continue;
 402
 403                         (void) snprintf(n, PROF_NAMELEN, "%s%d",
 404                             PROF_PREFIX_PROFILE, rate);
 405                         profile_create(NANOSEC / rate, n, PROF_PROFILE);
 406                 }
 407
 408                 for (i = 0; i < sizeof (profile_ticks) / sizeof (int); i++) {
 409                         if ((rate = profile_ticks[i]) == 0)
 410                                 continue;
 411
 412                         (void) snprintf(n, PROF_NAMELEN, "%s%d",
 413                             PROF_PREFIX_TICK, rate);
 414                         profile_create(NANOSEC / rate, n, PROF_TICK);
 415                 }
 416
 417                 return;
 418         }
 419
 420         name = desc->dtpd_name;
 421
 422         for (i = 0; types[i].prefix != NULL; i++) {
 423                 len = strlen(types[i].prefix);
 424
 425                 if (strncmp(name, types[i].prefix, len) != 0)
 426                         continue;
 427                 break;
 428         }
 429
 430         if (types[i].prefix == NULL)
 431                 return;
 432
 433         kind = types[i].kind;
 434         j = strlen(name) - len;
 435
 436         /*
 437          * We need to start before any time suffix.
 438          */
 439         for (j = strlen(name); j >= len; j--) {
 440                 if (name[j] >= '0' && name[j] <= '9')
 441                         break;
 442                 suffix = &name[j];
 443         }
 444
 445         ASSERT(suffix != NULL);
 446
 447         /*
 448          * Now determine the numerical value present in the probe name.
 449          */
 450         for (; j >= len; j--) {
 451                 if (name[j] < '0' || name[j] > '9')
 452                         return;
 453
 454                 val += (name[j] - '0') * mult;
 455                 mult *= (hrtime_t)10;
 456         }
 457
 458         if (val == 0)
 459                 return;
 460
 461         /*
 462          * Look-up the suffix to determine the multiplier.
 463          */
 464         for (i = 0, mult = 0; suffixes[i].name != NULL; i++) {
 465                 if (strcasecmp(suffixes[i].name, suffix) == 0) {
 466                         mult = suffixes[i].mult;
 467                         break;
 468                 }
 469         }
 470
 471         if (suffixes[i].name == NULL && *suffix != '\0')
 472                 return;
 473
 474         if (mult == 0) {
 475                 /*
 476                  * The default is frequency-per-second.
 477                  */
 478                 val = NANOSEC / val;
 479         } else {
 480                 val *= mult;
 481         }
 482
 483         profile_create(val, name, kind);
 484 }
 485
 486 /* ARGSUSED */
 487 static void
 488 profile_destroy(void *arg, dtrace_id_t id, void *parg)
 489 {
 490         profile_probe_t *prof = parg;
 491
 492 #ifdef illumos
 493         ASSERT(prof->prof_cyclic == CYCLIC_NONE);
 494 #else
 495         ASSERT(!callout_active(&prof->prof_cyclic) && prof->prof_pcpus == NULL);
 496 #endif
 497         kmem_free(prof, sizeof (profile_probe_t));
 498
 499         ASSERT(profile_total >= 1);
 500         atomic_add_32(&profile_total, -1);
 501 }
 502
 503 #ifdef illumos
 504 /*ARGSUSED*/
 505 static void
 506 profile_online(void *arg, cpu_t *cpu, cyc_handler_t *hdlr, cyc_time_t *when)
 507 {
 508         profile_probe_t *prof = arg;
 509         profile_probe_percpu_t *pcpu;
 510
 511         pcpu = kmem_zalloc(sizeof (profile_probe_percpu_t), KM_SLEEP);
 512         pcpu->profc_probe = prof;
 513
 514         hdlr->cyh_func = profile_fire;
 515         hdlr->cyh_arg = pcpu;
 516
 517         when->cyt_interval = prof->prof_interval;
 518         when->cyt_when = gethrtime() + when->cyt_interval;
 519
 520         pcpu->profc_expected = when->cyt_when;
 521         pcpu->profc_interval = when->cyt_interval;
 522 }
 523
 524 /*ARGSUSED*/
 525 static void
 526 profile_offline(void *arg, cpu_t *cpu, void *oarg)
 527 {
 528         profile_probe_percpu_t *pcpu = oarg;
 529
 530         ASSERT(pcpu->profc_probe == arg);
 531         kmem_free(pcpu, sizeof (profile_probe_percpu_t));
 532 }
 533
 534 /* ARGSUSED */
 535 static void
 536 profile_enable(void *arg, dtrace_id_t id, void *parg)
 537 {
 538         profile_probe_t *prof = parg;
 539         cyc_omni_handler_t omni;
 540         cyc_handler_t hdlr;
 541         cyc_time_t when;
 542
 543         ASSERT(prof->prof_interval != 0);
 544         ASSERT(MUTEX_HELD(&cpu_lock));
 545
 546         if (prof->prof_kind == PROF_TICK) {
 547                 hdlr.cyh_func = profile_tick;
 548                 hdlr.cyh_arg = prof;
 549
 550                 when.cyt_interval = prof->prof_interval;
 551                 when.cyt_when = gethrtime() + when.cyt_interval;
 552         } else {
 553                 ASSERT(prof->prof_kind == PROF_PROFILE);
 554                 omni.cyo_online = profile_online;
 555                 omni.cyo_offline = profile_offline;
 556                 omni.cyo_arg = prof;
 557         }
 558
 559         if (prof->prof_kind == PROF_TICK) {
 560                 prof->prof_cyclic = cyclic_add(&hdlr, &when);
 561         } else {
 562                 prof->prof_cyclic = cyclic_add_omni(&omni);
 563         }
 564 }
 565
 566 /* ARGSUSED */
 567 static void
 568 profile_disable(void *arg, dtrace_id_t id, void *parg)
 569 {
 570         profile_probe_t *prof = parg;
 571
 572         ASSERT(prof->prof_cyclic != CYCLIC_NONE);
 573         ASSERT(MUTEX_HELD(&cpu_lock));
 574
 575         cyclic_remove(prof->prof_cyclic);
 576         prof->prof_cyclic = CYCLIC_NONE;
 577 }
 578
 579 #else
 580
 581 static void
 582 profile_enable_omni(profile_probe_t *prof)
 583 {
 584         profile_probe_percpu_t *pcpu;
 585         int cpu;
 586
 587         prof->prof_pcpus = kmem_zalloc((mp_maxid + 1) * sizeof(pcpu), KM_SLEEP);
 588         CPU_FOREACH(cpu) {
 589                 pcpu = kmem_zalloc(sizeof(profile_probe_percpu_t), KM_SLEEP);
 590                 prof->prof_pcpus[cpu] = pcpu;
 591                 pcpu->profc_probe = prof;
 592                 pcpu->profc_expected = sbinuptime() + prof->prof_interval;
 593                 pcpu->profc_interval = prof->prof_interval;
 594                 callout_init(&pcpu->profc_cyclic, 1);
 595                 callout_reset_sbt_on(&pcpu->profc_cyclic,
 596                     pcpu->profc_expected, 0, profile_fire, pcpu,
 597                     cpu, C_DIRECT_EXEC | C_ABSOLUTE);
 598         }
 599 }
 600
 601 static void
 602 profile_disable_omni(profile_probe_t *prof)
 603 {
 604         profile_probe_percpu_t *pcpu;
 605         int cpu;
 606
 607         ASSERT(prof->prof_pcpus != NULL);
 608         CPU_FOREACH(cpu) {
 609                 pcpu = prof->prof_pcpus[cpu];
 610                 ASSERT(pcpu->profc_probe == prof);
 611                 ASSERT(callout_active(&pcpu->profc_cyclic));
 612                 callout_stop(&pcpu->profc_cyclic);
 613                 callout_drain(&pcpu->profc_cyclic);
 614                 kmem_free(pcpu, sizeof(profile_probe_percpu_t));
 615         }
 616         kmem_free(prof->prof_pcpus, (mp_maxid + 1) * sizeof(pcpu));
 617         prof->prof_pcpus = NULL;
 618 }
 619
 620 /* ARGSUSED */
 621 static void
 622 profile_enable(void *arg, dtrace_id_t id, void *parg)
 623 {
 624         profile_probe_t *prof = parg;
 625
 626         if (prof->prof_kind == PROF_TICK) {
 627                 prof->prof_expected = sbinuptime() + prof->prof_interval;
 628                 callout_reset_sbt(&prof->prof_cyclic,
 629                     prof->prof_expected, 0, profile_tick, prof,
 630                     C_DIRECT_EXEC | C_ABSOLUTE);
 631         } else {
 632                 ASSERT(prof->prof_kind == PROF_PROFILE);
 633                 profile_enable_omni(prof);
 634         }
 635 }
 636
 637 /* ARGSUSED */
 638 static void
 639 profile_disable(void *arg, dtrace_id_t id, void *parg)
 640 {
 641         profile_probe_t *prof = parg;
 642
 643         if (prof->prof_kind == PROF_TICK) {
 644                 ASSERT(callout_active(&prof->prof_cyclic));
 645                 callout_stop(&prof->prof_cyclic);
 646                 callout_drain(&prof->prof_cyclic);
 647         } else {
 648                 ASSERT(prof->prof_kind == PROF_PROFILE);
 649                 profile_disable_omni(prof);
 650         }
 651 }
 652 #endif
 653
 654 static void
 655 profile_load(void *dummy)
 656 {
 657         /* Create the /dev/dtrace/profile entry. */
 658         profile_cdev = make_dev(&profile_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600,
 659             "dtrace/profile");
 660
 661         if (dtrace_register("profile", &profile_attr, DTRACE_PRIV_USER,
 662             NULL, &profile_pops, NULL, &profile_id) != 0)
 663                 return;
 664 }
 665
 666
 667 static int
 668 profile_unload()
 669 {
 670         int error = 0;
 671
 672         if ((error = dtrace_unregister(profile_id)) != 0)
 673                 return (error);
 674
 675         destroy_dev(profile_cdev);
 676
 677         return (error);
 678 }
 679
 680 /* ARGSUSED */
 681 static int
 682 profile_modevent(module_t mod __unused, int type, void *data __unused)
 683 {
 684         int error = 0;
 685
 686         switch (type) {
 687         case MOD_LOAD:
 688                 break;
 689
 690         case MOD_UNLOAD:
 691                 break;
 692
 693         case MOD_SHUTDOWN:
 694                 break;
 695
 696         default:
 697                 error = EOPNOTSUPP;
 698                 break;
 699
 700         }
 701         return (error);
 702 }
 703
 704 /* ARGSUSED */
 705 static int
 706 profile_open(struct cdev *dev __unused, int oflags __unused, int devtype __unused, struct thread *td __unused)
 707 {
 708         return (0);
 709 }
 710
 711 SYSINIT(profile_load, SI_SUB_DTRACE_PROVIDER, SI_ORDER_ANY, profile_load, NULL);
 712 SYSUNINIT(profile_unload, SI_SUB_DTRACE_PROVIDER, SI_ORDER_ANY, profile_unload, NULL);
 713
 714 DEV_MODULE(profile, profile_modevent, NULL);
 715 MODULE_VERSION(profile, 1);
 716 MODULE_DEPEND(profile, dtrace, 1, 1, 1);
 717 MODULE_DEPEND(profile, opensolaris, 1, 1, 1);