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 | CTLFLAG_MPSAFE, 0,
 243     "DTrace profile parameters");
 244 SYSCTL_INT(_kern_dtrace_profile, OID_AUTO, aframes, CTLFLAG_RW, &profile_aframes,
 245     0, "Skipped frames for profile provider");
 246
 247 static sbintime_t
 248 nsec_to_sbt(hrtime_t nsec)
 249 {
 250         time_t sec;
 251
 252         /*
 253          * We need to calculate nsec * 2^32 / 10^9
 254          * Seconds and nanoseconds are split to avoid overflow.
 255          */
 256         sec = nsec / NANOSEC;
 257         nsec = nsec % NANOSEC;
 258         return (((sbintime_t)sec << 32) | ((sbintime_t)nsec << 32) / NANOSEC);
 259 }
 260
 261 static hrtime_t
 262 sbt_to_nsec(sbintime_t sbt)
 263 {
 264
 265         return ((sbt >> 32) * NANOSEC +
 266             (((uint32_t)sbt * (hrtime_t)NANOSEC) >> 32));
 267 }
 268
 269 static void
 270 profile_probe(profile_probe_t *prof, hrtime_t late)
 271 {
 272         struct thread *td;
 273         struct trapframe *frame;
 274         uintfptr_t pc, upc;
 275
 276         td = curthread;
 277         pc = upc = 0;
 278
 279         /*
 280          * td_intr_frame can be unset if this is a catch-up event upon waking up
 281          * from idle sleep. This can only happen on a CPU idle thread. Use a
 282          * representative arg0 value in this case so that one of the probe
 283          * arguments is non-zero.
 284          */
 285         frame = td->td_intr_frame;
 286         if (frame != NULL) {
 287                 if (TRAPF_USERMODE(frame))
 288                         upc = TRAPF_PC(frame);
 289                 else
 290                         pc = TRAPF_PC(frame);
 291         } else if (TD_IS_IDLETHREAD(td))
 292                 pc = (uintfptr_t)&cpu_idle;
 293
 294         dtrace_probe(prof->prof_id, pc, upc, late, 0, 0);
 295 }
 296
 297 static void
 298 profile_fire(void *arg)
 299 {
 300         profile_probe_percpu_t *pcpu = arg;
 301         profile_probe_t *prof = pcpu->profc_probe;
 302         hrtime_t late;
 303
 304         late = sbt_to_nsec(sbinuptime() - pcpu->profc_expected);
 305
 306         profile_probe(prof, late);
 307         pcpu->profc_expected += pcpu->profc_interval;
 308         callout_schedule_sbt_curcpu(&pcpu->profc_cyclic,
 309             pcpu->profc_expected, 0, C_DIRECT_EXEC | C_ABSOLUTE);
 310 }
 311
 312 static void
 313 profile_tick(void *arg)
 314 {
 315         profile_probe_t *prof = arg;
 316
 317         profile_probe(prof, 0);
 318         prof->prof_expected += prof->prof_interval;
 319         callout_schedule_sbt(&prof->prof_cyclic,
 320             prof->prof_expected, 0, C_DIRECT_EXEC | C_ABSOLUTE);
 321 }
 322
 323 static void
 324 profile_create(hrtime_t interval, char *name, int kind)
 325 {
 326         profile_probe_t *prof;
 327
 328         if (interval < profile_interval_min)
 329                 return;
 330
 331         if (dtrace_probe_lookup(profile_id, NULL, NULL, name) != 0)
 332                 return;
 333
 334         atomic_add_32(&profile_total, 1);
 335         if (profile_total > profile_max) {
 336                 atomic_add_32(&profile_total, -1);
 337                 return;
 338         }
 339
 340         prof = kmem_zalloc(sizeof (profile_probe_t), KM_SLEEP);
 341         (void) strcpy(prof->prof_name, name);
 342 #ifdef illumos
 343         prof->prof_interval = interval;
 344         prof->prof_cyclic = CYCLIC_NONE;
 345 #else
 346         prof->prof_interval = nsec_to_sbt(interval);
 347         callout_init(&prof->prof_cyclic, 1);
 348 #endif
 349         prof->prof_kind = kind;
 350         prof->prof_id = dtrace_probe_create(profile_id,
 351             NULL, NULL, name,
 352             profile_aframes, prof);
 353 }
 354
 355 /*ARGSUSED*/
 356 static void
 357 profile_provide(void *arg, dtrace_probedesc_t *desc)
 358 {
 359         int i, j, rate, kind;
 360         hrtime_t val = 0, mult = 1, len = 0;
 361         char *name, *suffix = NULL;
 362
 363         const struct {
 364                 char *prefix;
 365                 int kind;
 366         } types[] = {
 367                 { PROF_PREFIX_PROFILE, PROF_PROFILE },
 368                 { PROF_PREFIX_TICK, PROF_TICK },
 369                 { 0, 0 }
 370         };
 371
 372         const struct {
 373                 char *name;
 374                 hrtime_t mult;
 375         } suffixes[] = {
 376                 { "ns",         NANOSEC / NANOSEC },
 377                 { "nsec",       NANOSEC / NANOSEC },
 378                 { "us",         NANOSEC / MICROSEC },
 379                 { "usec",       NANOSEC / MICROSEC },
 380                 { "ms",         NANOSEC / MILLISEC },
 381                 { "msec",       NANOSEC / MILLISEC },
 382                 { "s",          NANOSEC / SEC },
 383                 { "sec",        NANOSEC / SEC },
 384                 { "m",          NANOSEC * (hrtime_t)60 },
 385                 { "min",        NANOSEC * (hrtime_t)60 },
 386                 { "h",          NANOSEC * (hrtime_t)(60 * 60) },
 387                 { "hour",       NANOSEC * (hrtime_t)(60 * 60) },
 388                 { "d",          NANOSEC * (hrtime_t)(24 * 60 * 60) },
 389                 { "day",        NANOSEC * (hrtime_t)(24 * 60 * 60) },
 390                 { "hz",         0 },
 391                 { NULL }
 392         };
 393
 394         if (desc == NULL) {
 395                 char n[PROF_NAMELEN];
 396
 397                 /*
 398                  * If no description was provided, provide all of our probes.
 399                  */
 400                 for (i = 0; i < sizeof (profile_rates) / sizeof (int); i++) {
 401                         if ((rate = profile_rates[i]) == 0)
 402                                 continue;
 403
 404                         (void) snprintf(n, PROF_NAMELEN, "%s%d",
 405                             PROF_PREFIX_PROFILE, rate);
 406                         profile_create(NANOSEC / rate, n, PROF_PROFILE);
 407                 }
 408
 409                 for (i = 0; i < sizeof (profile_ticks) / sizeof (int); i++) {
 410                         if ((rate = profile_ticks[i]) == 0)
 411                                 continue;
 412
 413                         (void) snprintf(n, PROF_NAMELEN, "%s%d",
 414                             PROF_PREFIX_TICK, rate);
 415                         profile_create(NANOSEC / rate, n, PROF_TICK);
 416                 }
 417
 418                 return;
 419         }
 420
 421         name = desc->dtpd_name;
 422
 423         for (i = 0; types[i].prefix != NULL; i++) {
 424                 len = strlen(types[i].prefix);
 425
 426                 if (strncmp(name, types[i].prefix, len) != 0)
 427                         continue;
 428                 break;
 429         }
 430
 431         if (types[i].prefix == NULL)
 432                 return;
 433
 434         kind = types[i].kind;
 435         j = strlen(name) - len;
 436
 437         /*
 438          * We need to start before any time suffix.
 439          */
 440         for (j = strlen(name); j >= len; j--) {
 441                 if (name[j] >= '0' && name[j] <= '9')
 442                         break;
 443                 suffix = &name[j];
 444         }
 445
 446         ASSERT(suffix != NULL);
 447
 448         /*
 449          * Now determine the numerical value present in the probe name.
 450          */
 451         for (; j >= len; j--) {
 452                 if (name[j] < '0' || name[j] > '9')
 453                         return;
 454
 455                 val += (name[j] - '0') * mult;
 456                 mult *= (hrtime_t)10;
 457         }
 458
 459         if (val == 0)
 460                 return;
 461
 462         /*
 463          * Look-up the suffix to determine the multiplier.
 464          */
 465         for (i = 0, mult = 0; suffixes[i].name != NULL; i++) {
 466                 if (strcasecmp(suffixes[i].name, suffix) == 0) {
 467                         mult = suffixes[i].mult;
 468                         break;
 469                 }
 470         }
 471
 472         if (suffixes[i].name == NULL && *suffix != '\0')
 473                 return;
 474
 475         if (mult == 0) {
 476                 /*
 477                  * The default is frequency-per-second.
 478                  */
 479                 val = NANOSEC / val;
 480         } else {
 481                 val *= mult;
 482         }
 483
 484         profile_create(val, name, kind);
 485 }
 486
 487 /* ARGSUSED */
 488 static void
 489 profile_destroy(void *arg, dtrace_id_t id, void *parg)
 490 {
 491         profile_probe_t *prof = parg;
 492
 493 #ifdef illumos
 494         ASSERT(prof->prof_cyclic == CYCLIC_NONE);
 495 #else
 496         ASSERT(!callout_active(&prof->prof_cyclic) && prof->prof_pcpus == NULL);
 497 #endif
 498         kmem_free(prof, sizeof (profile_probe_t));
 499
 500         ASSERT(profile_total >= 1);
 501         atomic_add_32(&profile_total, -1);
 502 }
 503
 504 #ifdef illumos
 505 /*ARGSUSED*/
 506 static void
 507 profile_online(void *arg, cpu_t *cpu, cyc_handler_t *hdlr, cyc_time_t *when)
 508 {
 509         profile_probe_t *prof = arg;
 510         profile_probe_percpu_t *pcpu;
 511
 512         pcpu = kmem_zalloc(sizeof (profile_probe_percpu_t), KM_SLEEP);
 513         pcpu->profc_probe = prof;
 514
 515         hdlr->cyh_func = profile_fire;
 516         hdlr->cyh_arg = pcpu;
 517
 518         when->cyt_interval = prof->prof_interval;
 519         when->cyt_when = gethrtime() + when->cyt_interval;
 520
 521         pcpu->profc_expected = when->cyt_when;
 522         pcpu->profc_interval = when->cyt_interval;
 523 }
 524
 525 /*ARGSUSED*/
 526 static void
 527 profile_offline(void *arg, cpu_t *cpu, void *oarg)
 528 {
 529         profile_probe_percpu_t *pcpu = oarg;
 530
 531         ASSERT(pcpu->profc_probe == arg);
 532         kmem_free(pcpu, sizeof (profile_probe_percpu_t));
 533 }
 534
 535 /* ARGSUSED */
 536 static void
 537 profile_enable(void *arg, dtrace_id_t id, void *parg)
 538 {
 539         profile_probe_t *prof = parg;
 540         cyc_omni_handler_t omni;
 541         cyc_handler_t hdlr;
 542         cyc_time_t when;
 543
 544         ASSERT(prof->prof_interval != 0);
 545         ASSERT(MUTEX_HELD(&cpu_lock));
 546
 547         if (prof->prof_kind == PROF_TICK) {
 548                 hdlr.cyh_func = profile_tick;
 549                 hdlr.cyh_arg = prof;
 550
 551                 when.cyt_interval = prof->prof_interval;
 552                 when.cyt_when = gethrtime() + when.cyt_interval;
 553         } else {
 554                 ASSERT(prof->prof_kind == PROF_PROFILE);
 555                 omni.cyo_online = profile_online;
 556                 omni.cyo_offline = profile_offline;
 557                 omni.cyo_arg = prof;
 558         }
 559
 560         if (prof->prof_kind == PROF_TICK) {
 561                 prof->prof_cyclic = cyclic_add(&hdlr, &when);
 562         } else {
 563                 prof->prof_cyclic = cyclic_add_omni(&omni);
 564         }
 565 }
 566
 567 /* ARGSUSED */
 568 static void
 569 profile_disable(void *arg, dtrace_id_t id, void *parg)
 570 {
 571         profile_probe_t *prof = parg;
 572
 573         ASSERT(prof->prof_cyclic != CYCLIC_NONE);
 574         ASSERT(MUTEX_HELD(&cpu_lock));
 575
 576         cyclic_remove(prof->prof_cyclic);
 577         prof->prof_cyclic = CYCLIC_NONE;
 578 }
 579
 580 #else
 581
 582 static void
 583 profile_enable_omni(profile_probe_t *prof)
 584 {
 585         profile_probe_percpu_t *pcpu;
 586         int cpu;
 587
 588         prof->prof_pcpus = kmem_zalloc((mp_maxid + 1) * sizeof(pcpu), KM_SLEEP);
 589         CPU_FOREACH(cpu) {
 590                 pcpu = kmem_zalloc(sizeof(profile_probe_percpu_t), KM_SLEEP);
 591                 prof->prof_pcpus[cpu] = pcpu;
 592                 pcpu->profc_probe = prof;
 593                 pcpu->profc_expected = sbinuptime() + prof->prof_interval;
 594                 pcpu->profc_interval = prof->prof_interval;
 595                 callout_init(&pcpu->profc_cyclic, 1);
 596                 callout_reset_sbt_on(&pcpu->profc_cyclic,
 597                     pcpu->profc_expected, 0, profile_fire, pcpu,
 598                     cpu, C_DIRECT_EXEC | C_ABSOLUTE);
 599         }
 600 }
 601
 602 static void
 603 profile_disable_omni(profile_probe_t *prof)
 604 {
 605         profile_probe_percpu_t *pcpu;
 606         int cpu;
 607
 608         ASSERT(prof->prof_pcpus != NULL);
 609         CPU_FOREACH(cpu) {
 610                 pcpu = prof->prof_pcpus[cpu];
 611                 ASSERT(pcpu->profc_probe == prof);
 612                 ASSERT(callout_active(&pcpu->profc_cyclic));
 613                 callout_stop(&pcpu->profc_cyclic);
 614                 callout_drain(&pcpu->profc_cyclic);
 615                 kmem_free(pcpu, sizeof(profile_probe_percpu_t));
 616         }
 617         kmem_free(prof->prof_pcpus, (mp_maxid + 1) * sizeof(pcpu));
 618         prof->prof_pcpus = NULL;
 619 }
 620
 621 /* ARGSUSED */
 622 static void
 623 profile_enable(void *arg, dtrace_id_t id, void *parg)
 624 {
 625         profile_probe_t *prof = parg;
 626
 627         if (prof->prof_kind == PROF_TICK) {
 628                 prof->prof_expected = sbinuptime() + prof->prof_interval;
 629                 callout_reset_sbt(&prof->prof_cyclic,
 630                     prof->prof_expected, 0, profile_tick, prof,
 631                     C_DIRECT_EXEC | C_ABSOLUTE);
 632         } else {
 633                 ASSERT(prof->prof_kind == PROF_PROFILE);
 634                 profile_enable_omni(prof);
 635         }
 636 }
 637
 638 /* ARGSUSED */
 639 static void
 640 profile_disable(void *arg, dtrace_id_t id, void *parg)
 641 {
 642         profile_probe_t *prof = parg;
 643
 644         if (prof->prof_kind == PROF_TICK) {
 645                 ASSERT(callout_active(&prof->prof_cyclic));
 646                 callout_stop(&prof->prof_cyclic);
 647                 callout_drain(&prof->prof_cyclic);
 648         } else {
 649                 ASSERT(prof->prof_kind == PROF_PROFILE);
 650                 profile_disable_omni(prof);
 651         }
 652 }
 653 #endif
 654
 655 static void
 656 profile_load(void *dummy)
 657 {
 658         /* Create the /dev/dtrace/profile entry. */
 659         profile_cdev = make_dev(&profile_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600,
 660             "dtrace/profile");
 661
 662         if (dtrace_register("profile", &profile_attr, DTRACE_PRIV_USER,
 663             NULL, &profile_pops, NULL, &profile_id) != 0)
 664                 return;
 665 }
 666
 667
 668 static int
 669 profile_unload()
 670 {
 671         int error = 0;
 672
 673         if ((error = dtrace_unregister(profile_id)) != 0)
 674                 return (error);
 675
 676         destroy_dev(profile_cdev);
 677
 678         return (error);
 679 }
 680
 681 /* ARGSUSED */
 682 static int
 683 profile_modevent(module_t mod __unused, int type, void *data __unused)
 684 {
 685         int error = 0;
 686
 687         switch (type) {
 688         case MOD_LOAD:
 689                 break;
 690
 691         case MOD_UNLOAD:
 692                 break;
 693
 694         case MOD_SHUTDOWN:
 695                 break;
 696
 697         default:
 698                 error = EOPNOTSUPP;
 699                 break;
 700
 701         }
 702         return (error);
 703 }
 704
 705 /* ARGSUSED */
 706 static int
 707 profile_open(struct cdev *dev __unused, int oflags __unused, int devtype __unused, struct thread *td __unused)
 708 {
 709         return (0);
 710 }
 711
 712 SYSINIT(profile_load, SI_SUB_DTRACE_PROVIDER, SI_ORDER_ANY, profile_load, NULL);
 713 SYSUNINIT(profile_unload, SI_SUB_DTRACE_PROVIDER, SI_ORDER_ANY, profile_unload, NULL);
 714
 715 DEV_MODULE(profile, profile_modevent, NULL);
 716 MODULE_VERSION(profile, 1);
 717 MODULE_DEPEND(profile, dtrace, 1, 1, 1);
 718 MODULE_DEPEND(profile, opensolaris, 1, 1, 1);