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