rcu.h 21.9 KB
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737
#undef TRACE_SYSTEM
#define TRACE_SYSTEM rcu

#if !defined(_TRACE_RCU_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_RCU_H

#include <linux/tracepoint.h>

/*
 * Tracepoint for start/end markers used for utilization calculations.
 * By convention, the string is of the following forms:
 *
 * "Start <activity>" -- Mark the start of the specified activity,
 *			 such as "context switch".  Nesting is permitted.
 * "End <activity>" -- Mark the end of the specified activity.
 *
 * An "@" character within "<activity>" is a comment character: Data
 * reduction scripts will ignore the "@" and the remainder of the line.
 */
TRACE_EVENT(rcu_utilization,

	TP_PROTO(const char *s),

	TP_ARGS(s),

	TP_STRUCT__entry(
		__field(const char *, s)
	),

	TP_fast_assign(
		__entry->s = s;
	),

	TP_printk("%s", __entry->s)
);

#ifdef CONFIG_RCU_TRACE

#if defined(CONFIG_TREE_RCU) || defined(CONFIG_TREE_PREEMPT_RCU)

/*
 * Tracepoint for grace-period events.  Takes a string identifying the
 * RCU flavor, the grace-period number, and a string identifying the
 * grace-period-related event as follows:
 *
 *	"AccReadyCB": CPU acclerates new callbacks to RCU_NEXT_READY_TAIL.
 *	"AccWaitCB": CPU accelerates new callbacks to RCU_WAIT_TAIL.
 *	"newreq": Request a new grace period.
 *	"start": Start a grace period.
 *	"cpustart": CPU first notices a grace-period start.
 *	"cpuqs": CPU passes through a quiescent state.
 *	"cpuonl": CPU comes online.
 *	"cpuofl": CPU goes offline.
 *	"reqwait": GP kthread sleeps waiting for grace-period request.
 *	"reqwaitsig": GP kthread awakened by signal from reqwait state.
 *	"fqswait": GP kthread waiting until time to force quiescent states.
 *	"fqsstart": GP kthread starts forcing quiescent states.
 *	"fqsend": GP kthread done forcing quiescent states.
 *	"fqswaitsig": GP kthread awakened by signal from fqswait state.
 *	"end": End a grace period.
 *	"cpuend": CPU first notices a grace-period end.
 */
TRACE_EVENT(rcu_grace_period,

	TP_PROTO(const char *rcuname, unsigned long gpnum, const char *gpevent),

	TP_ARGS(rcuname, gpnum, gpevent),

	TP_STRUCT__entry(
		__field(const char *, rcuname)
		__field(unsigned long, gpnum)
		__field(const char *, gpevent)
	),

	TP_fast_assign(
		__entry->rcuname = rcuname;
		__entry->gpnum = gpnum;
		__entry->gpevent = gpevent;
	),

	TP_printk("%s %lu %s",
		  __entry->rcuname, __entry->gpnum, __entry->gpevent)
);

/*
 * Tracepoint for future grace-period events, including those for no-callbacks
 * CPUs.  The caller should pull the data from the rcu_node structure,
 * other than rcuname, which comes from the rcu_state structure, and event,
 * which is one of the following:
 *
 * "Startleaf": Request a nocb grace period based on leaf-node data.
 * "Startedleaf": Leaf-node start proved sufficient.
 * "Startedleafroot": Leaf-node start proved sufficient after checking root.
 * "Startedroot": Requested a nocb grace period based on root-node data.
 * "StartWait": Start waiting for the requested grace period.
 * "ResumeWait": Resume waiting after signal.
 * "EndWait": Complete wait.
 * "Cleanup": Clean up rcu_node structure after previous GP.
 * "CleanupMore": Clean up, and another no-CB GP is needed.
 */
TRACE_EVENT(rcu_future_grace_period,

	TP_PROTO(const char *rcuname, unsigned long gpnum, unsigned long completed,
		 unsigned long c, u8 level, int grplo, int grphi,
		 const char *gpevent),

	TP_ARGS(rcuname, gpnum, completed, c, level, grplo, grphi, gpevent),

	TP_STRUCT__entry(
		__field(const char *, rcuname)
		__field(unsigned long, gpnum)
		__field(unsigned long, completed)
		__field(unsigned long, c)
		__field(u8, level)
		__field(int, grplo)
		__field(int, grphi)
		__field(const char *, gpevent)
	),

	TP_fast_assign(
		__entry->rcuname = rcuname;
		__entry->gpnum = gpnum;
		__entry->completed = completed;
		__entry->c = c;
		__entry->level = level;
		__entry->grplo = grplo;
		__entry->grphi = grphi;
		__entry->gpevent = gpevent;
	),

	TP_printk("%s %lu %lu %lu %u %d %d %s",
		  __entry->rcuname, __entry->gpnum, __entry->completed,
		  __entry->c, __entry->level, __entry->grplo, __entry->grphi,
		  __entry->gpevent)
);

/*
 * Tracepoint for grace-period-initialization events.  These are
 * distinguished by the type of RCU, the new grace-period number, the
 * rcu_node structure level, the starting and ending CPU covered by the
 * rcu_node structure, and the mask of CPUs that will be waited for.
 * All but the type of RCU are extracted from the rcu_node structure.
 */
TRACE_EVENT(rcu_grace_period_init,

	TP_PROTO(const char *rcuname, unsigned long gpnum, u8 level,
		 int grplo, int grphi, unsigned long qsmask),

	TP_ARGS(rcuname, gpnum, level, grplo, grphi, qsmask),

	TP_STRUCT__entry(
		__field(const char *, rcuname)
		__field(unsigned long, gpnum)
		__field(u8, level)
		__field(int, grplo)
		__field(int, grphi)
		__field(unsigned long, qsmask)
	),

	TP_fast_assign(
		__entry->rcuname = rcuname;
		__entry->gpnum = gpnum;
		__entry->level = level;
		__entry->grplo = grplo;
		__entry->grphi = grphi;
		__entry->qsmask = qsmask;
	),

	TP_printk("%s %lu %u %d %d %lx",
		  __entry->rcuname, __entry->gpnum, __entry->level,
		  __entry->grplo, __entry->grphi, __entry->qsmask)
);

/*
 * Tracepoint for RCU no-CBs CPU callback handoffs.  This event is intended
 * to assist debugging of these handoffs.
 *
 * The first argument is the name of the RCU flavor, and the second is
 * the number of the offloaded CPU are extracted.  The third and final
 * argument is a string as follows:
 *
 *	"WakeEmpty": Wake rcuo kthread, first CB to empty list.
 *	"WakeOvf": Wake rcuo kthread, CB list is huge.
 *	"WakeNot": Don't wake rcuo kthread.
 *	"WakeNotPoll": Don't wake rcuo kthread because it is polling.
 *	"Poll": Start of new polling cycle for rcu_nocb_poll.
 *	"Sleep": Sleep waiting for CBs for !rcu_nocb_poll.
 *	"WokeEmpty": rcuo kthread woke to find empty list.
 *	"WokeNonEmpty": rcuo kthread woke to find non-empty list.
 *	"WaitQueue": Enqueue partially done, timed wait for it to complete.
 *	"WokeQueue": Partial enqueue now complete.
 */
TRACE_EVENT(rcu_nocb_wake,

	TP_PROTO(const char *rcuname, int cpu, const char *reason),

	TP_ARGS(rcuname, cpu, reason),

	TP_STRUCT__entry(
		__field(const char *, rcuname)
		__field(int, cpu)
		__field(const char *, reason)
	),

	TP_fast_assign(
		__entry->rcuname = rcuname;
		__entry->cpu = cpu;
		__entry->reason = reason;
	),

	TP_printk("%s %d %s", __entry->rcuname, __entry->cpu, __entry->reason)
);

/*
 * Tracepoint for tasks blocking within preemptible-RCU read-side
 * critical sections.  Track the type of RCU (which one day might
 * include SRCU), the grace-period number that the task is blocking
 * (the current or the next), and the task's PID.
 */
TRACE_EVENT(rcu_preempt_task,

	TP_PROTO(const char *rcuname, int pid, unsigned long gpnum),

	TP_ARGS(rcuname, pid, gpnum),

	TP_STRUCT__entry(
		__field(const char *, rcuname)
		__field(unsigned long, gpnum)
		__field(int, pid)
	),

	TP_fast_assign(
		__entry->rcuname = rcuname;
		__entry->gpnum = gpnum;
		__entry->pid = pid;
	),

	TP_printk("%s %lu %d",
		  __entry->rcuname, __entry->gpnum, __entry->pid)
);

/*
 * Tracepoint for tasks that blocked within a given preemptible-RCU
 * read-side critical section exiting that critical section.  Track the
 * type of RCU (which one day might include SRCU) and the task's PID.
 */
TRACE_EVENT(rcu_unlock_preempted_task,

	TP_PROTO(const char *rcuname, unsigned long gpnum, int pid),

	TP_ARGS(rcuname, gpnum, pid),

	TP_STRUCT__entry(
		__field(const char *, rcuname)
		__field(unsigned long, gpnum)
		__field(int, pid)
	),

	TP_fast_assign(
		__entry->rcuname = rcuname;
		__entry->gpnum = gpnum;
		__entry->pid = pid;
	),

	TP_printk("%s %lu %d", __entry->rcuname, __entry->gpnum, __entry->pid)
);

/*
 * Tracepoint for quiescent-state-reporting events.  These are
 * distinguished by the type of RCU, the grace-period number, the
 * mask of quiescent lower-level entities, the rcu_node structure level,
 * the starting and ending CPU covered by the rcu_node structure, and
 * whether there are any blocked tasks blocking the current grace period.
 * All but the type of RCU are extracted from the rcu_node structure.
 */
TRACE_EVENT(rcu_quiescent_state_report,

	TP_PROTO(const char *rcuname, unsigned long gpnum,
		 unsigned long mask, unsigned long qsmask,
		 u8 level, int grplo, int grphi, int gp_tasks),

	TP_ARGS(rcuname, gpnum, mask, qsmask, level, grplo, grphi, gp_tasks),

	TP_STRUCT__entry(
		__field(const char *, rcuname)
		__field(unsigned long, gpnum)
		__field(unsigned long, mask)
		__field(unsigned long, qsmask)
		__field(u8, level)
		__field(int, grplo)
		__field(int, grphi)
		__field(u8, gp_tasks)
	),

	TP_fast_assign(
		__entry->rcuname = rcuname;
		__entry->gpnum = gpnum;
		__entry->mask = mask;
		__entry->qsmask = qsmask;
		__entry->level = level;
		__entry->grplo = grplo;
		__entry->grphi = grphi;
		__entry->gp_tasks = gp_tasks;
	),

	TP_printk("%s %lu %lx>%lx %u %d %d %u",
		  __entry->rcuname, __entry->gpnum,
		  __entry->mask, __entry->qsmask, __entry->level,
		  __entry->grplo, __entry->grphi, __entry->gp_tasks)
);

/*
 * Tracepoint for quiescent states detected by force_quiescent_state().
 * These trace events include the type of RCU, the grace-period number
 * that was blocked by the CPU, the CPU itself, and the type of quiescent
 * state, which can be "dti" for dyntick-idle mode, "ofl" for CPU offline,
 * or "kick" when kicking a CPU that has been in dyntick-idle mode for
 * too long.
 */
TRACE_EVENT(rcu_fqs,

	TP_PROTO(const char *rcuname, unsigned long gpnum, int cpu, const char *qsevent),

	TP_ARGS(rcuname, gpnum, cpu, qsevent),

	TP_STRUCT__entry(
		__field(const char *, rcuname)
		__field(unsigned long, gpnum)
		__field(int, cpu)
		__field(const char *, qsevent)
	),

	TP_fast_assign(
		__entry->rcuname = rcuname;
		__entry->gpnum = gpnum;
		__entry->cpu = cpu;
		__entry->qsevent = qsevent;
	),

	TP_printk("%s %lu %d %s",
		  __entry->rcuname, __entry->gpnum,
		  __entry->cpu, __entry->qsevent)
);

#endif /* #if defined(CONFIG_TREE_RCU) || defined(CONFIG_TREE_PREEMPT_RCU) */

/*
 * Tracepoint for dyntick-idle entry/exit events.  These take a string
 * as argument: "Start" for entering dyntick-idle mode, "End" for
 * leaving it, "--=" for events moving towards idle, and "++=" for events
 * moving away from idle.  "Error on entry: not idle task" and "Error on
 * exit: not idle task" indicate that a non-idle task is erroneously
 * toying with the idle loop.
 *
 * These events also take a pair of numbers, which indicate the nesting
 * depth before and after the event of interest.  Note that task-related
 * events use the upper bits of each number, while interrupt-related
 * events use the lower bits.
 */
TRACE_EVENT(rcu_dyntick,

	TP_PROTO(const char *polarity, long long oldnesting, long long newnesting),

	TP_ARGS(polarity, oldnesting, newnesting),

	TP_STRUCT__entry(
		__field(const char *, polarity)
		__field(long long, oldnesting)
		__field(long long, newnesting)
	),

	TP_fast_assign(
		__entry->polarity = polarity;
		__entry->oldnesting = oldnesting;
		__entry->newnesting = newnesting;
	),

	TP_printk("%s %llx %llx", __entry->polarity,
		  __entry->oldnesting, __entry->newnesting)
);

/*
 * Tracepoint for RCU preparation for idle, the goal being to get RCU
 * processing done so that the current CPU can shut off its scheduling
 * clock and enter dyntick-idle mode.  One way to accomplish this is
 * to drain all RCU callbacks from this CPU, and the other is to have
 * done everything RCU requires for the current grace period.  In this
 * latter case, the CPU will be awakened at the end of the current grace
 * period in order to process the remainder of its callbacks.
 *
 * These tracepoints take a string as argument:
 *
 *	"No callbacks": Nothing to do, no callbacks on this CPU.
 *	"In holdoff": Nothing to do, holding off after unsuccessful attempt.
 *	"Begin holdoff": Attempt failed, don't retry until next jiffy.
 *	"Dyntick with callbacks": Entering dyntick-idle despite callbacks.
 *	"Dyntick with lazy callbacks": Entering dyntick-idle w/lazy callbacks.
 *	"More callbacks": Still more callbacks, try again to clear them out.
 *	"Callbacks drained": All callbacks processed, off to dyntick idle!
 *	"Timer": Timer fired to cause CPU to continue processing callbacks.
 *	"Demigrate": Timer fired on wrong CPU, woke up correct CPU.
 *	"Cleanup after idle": Idle exited, timer canceled.
 */
TRACE_EVENT(rcu_prep_idle,

	TP_PROTO(const char *reason),

	TP_ARGS(reason),

	TP_STRUCT__entry(
		__field(const char *, reason)
	),

	TP_fast_assign(
		__entry->reason = reason;
	),

	TP_printk("%s", __entry->reason)
);

/*
 * Tracepoint for the registration of a single RCU callback function.
 * The first argument is the type of RCU, the second argument is
 * a pointer to the RCU callback itself, the third element is the
 * number of lazy callbacks queued, and the fourth element is the
 * total number of callbacks queued.
 */
TRACE_EVENT(rcu_callback,

	TP_PROTO(const char *rcuname, struct rcu_head *rhp, long qlen_lazy,
		 long qlen),

	TP_ARGS(rcuname, rhp, qlen_lazy, qlen),

	TP_STRUCT__entry(
		__field(const char *, rcuname)
		__field(void *, rhp)
		__field(void *, func)
		__field(long, qlen_lazy)
		__field(long, qlen)
	),

	TP_fast_assign(
		__entry->rcuname = rcuname;
		__entry->rhp = rhp;
		__entry->func = rhp->func;
		__entry->qlen_lazy = qlen_lazy;
		__entry->qlen = qlen;
	),

	TP_printk("%s rhp=%p func=%pf %ld/%ld",
		  __entry->rcuname, __entry->rhp, __entry->func,
		  __entry->qlen_lazy, __entry->qlen)
);

/*
 * Tracepoint for the registration of a single RCU callback of the special
 * kfree() form.  The first argument is the RCU type, the second argument
 * is a pointer to the RCU callback, the third argument is the offset
 * of the callback within the enclosing RCU-protected data structure,
 * the fourth argument is the number of lazy callbacks queued, and the
 * fifth argument is the total number of callbacks queued.
 */
TRACE_EVENT(rcu_kfree_callback,

	TP_PROTO(const char *rcuname, struct rcu_head *rhp, unsigned long offset,
		 long qlen_lazy, long qlen),

	TP_ARGS(rcuname, rhp, offset, qlen_lazy, qlen),

	TP_STRUCT__entry(
		__field(const char *, rcuname)
		__field(void *, rhp)
		__field(unsigned long, offset)
		__field(long, qlen_lazy)
		__field(long, qlen)
	),

	TP_fast_assign(
		__entry->rcuname = rcuname;
		__entry->rhp = rhp;
		__entry->offset = offset;
		__entry->qlen_lazy = qlen_lazy;
		__entry->qlen = qlen;
	),

	TP_printk("%s rhp=%p func=%ld %ld/%ld",
		  __entry->rcuname, __entry->rhp, __entry->offset,
		  __entry->qlen_lazy, __entry->qlen)
);

/*
 * Tracepoint for marking the beginning rcu_do_batch, performed to start
 * RCU callback invocation.  The first argument is the RCU flavor,
 * the second is the number of lazy callbacks queued, the third is
 * the total number of callbacks queued, and the fourth argument is
 * the current RCU-callback batch limit.
 */
TRACE_EVENT(rcu_batch_start,

	TP_PROTO(const char *rcuname, long qlen_lazy, long qlen, long blimit),

	TP_ARGS(rcuname, qlen_lazy, qlen, blimit),

	TP_STRUCT__entry(
		__field(const char *, rcuname)
		__field(long, qlen_lazy)
		__field(long, qlen)
		__field(long, blimit)
	),

	TP_fast_assign(
		__entry->rcuname = rcuname;
		__entry->qlen_lazy = qlen_lazy;
		__entry->qlen = qlen;
		__entry->blimit = blimit;
	),

	TP_printk("%s CBs=%ld/%ld bl=%ld",
		  __entry->rcuname, __entry->qlen_lazy, __entry->qlen,
		  __entry->blimit)
);

/*
 * Tracepoint for the invocation of a single RCU callback function.
 * The first argument is the type of RCU, and the second argument is
 * a pointer to the RCU callback itself.
 */
TRACE_EVENT(rcu_invoke_callback,

	TP_PROTO(const char *rcuname, struct rcu_head *rhp),

	TP_ARGS(rcuname, rhp),

	TP_STRUCT__entry(
		__field(const char *, rcuname)
		__field(void *, rhp)
		__field(void *, func)
	),

	TP_fast_assign(
		__entry->rcuname = rcuname;
		__entry->rhp = rhp;
		__entry->func = rhp->func;
	),

	TP_printk("%s rhp=%p func=%pf",
		  __entry->rcuname, __entry->rhp, __entry->func)
);

/*
 * Tracepoint for the invocation of a single RCU callback of the special
 * kfree() form.  The first argument is the RCU flavor, the second
 * argument is a pointer to the RCU callback, and the third argument
 * is the offset of the callback within the enclosing RCU-protected
 * data structure.
 */
TRACE_EVENT(rcu_invoke_kfree_callback,

	TP_PROTO(const char *rcuname, struct rcu_head *rhp, unsigned long offset),

	TP_ARGS(rcuname, rhp, offset),

	TP_STRUCT__entry(
		__field(const char *, rcuname)
		__field(void *, rhp)
		__field(unsigned long, offset)
	),

	TP_fast_assign(
		__entry->rcuname = rcuname;
		__entry->rhp = rhp;
		__entry->offset	= offset;
	),

	TP_printk("%s rhp=%p func=%ld",
		  __entry->rcuname, __entry->rhp, __entry->offset)
);

/*
 * Tracepoint for exiting rcu_do_batch after RCU callbacks have been
 * invoked.  The first argument is the name of the RCU flavor,
 * the second argument is number of callbacks actually invoked,
 * the third argument (cb) is whether or not any of the callbacks that
 * were ready to invoke at the beginning of this batch are still
 * queued, the fourth argument (nr) is the return value of need_resched(),
 * the fifth argument (iit) is 1 if the current task is the idle task,
 * and the sixth argument (risk) is the return value from
 * rcu_is_callbacks_kthread().
 */
TRACE_EVENT(rcu_batch_end,

	TP_PROTO(const char *rcuname, int callbacks_invoked,
		 char cb, char nr, char iit, char risk),

	TP_ARGS(rcuname, callbacks_invoked, cb, nr, iit, risk),

	TP_STRUCT__entry(
		__field(const char *, rcuname)
		__field(int, callbacks_invoked)
		__field(char, cb)
		__field(char, nr)
		__field(char, iit)
		__field(char, risk)
	),

	TP_fast_assign(
		__entry->rcuname = rcuname;
		__entry->callbacks_invoked = callbacks_invoked;
		__entry->cb = cb;
		__entry->nr = nr;
		__entry->iit = iit;
		__entry->risk = risk;
	),

	TP_printk("%s CBs-invoked=%d idle=%c%c%c%c",
		  __entry->rcuname, __entry->callbacks_invoked,
		  __entry->cb ? 'C' : '.',
		  __entry->nr ? 'S' : '.',
		  __entry->iit ? 'I' : '.',
		  __entry->risk ? 'R' : '.')
);

/*
 * Tracepoint for rcutorture readers.  The first argument is the name
 * of the RCU flavor from rcutorture's viewpoint and the second argument
 * is the callback address.
 */
TRACE_EVENT(rcu_torture_read,

	TP_PROTO(const char *rcutorturename, struct rcu_head *rhp,
		 unsigned long secs, unsigned long c_old, unsigned long c),

	TP_ARGS(rcutorturename, rhp, secs, c_old, c),

	TP_STRUCT__entry(
		__field(const char *, rcutorturename)
		__field(struct rcu_head *, rhp)
		__field(unsigned long, secs)
		__field(unsigned long, c_old)
		__field(unsigned long, c)
	),

	TP_fast_assign(
		__entry->rcutorturename = rcutorturename;
		__entry->rhp = rhp;
		__entry->secs = secs;
		__entry->c_old = c_old;
		__entry->c = c;
	),

	TP_printk("%s torture read %p %luus c: %lu %lu",
		  __entry->rcutorturename, __entry->rhp,
		  __entry->secs, __entry->c_old, __entry->c)
);

/*
 * Tracepoint for _rcu_barrier() execution.  The string "s" describes
 * the _rcu_barrier phase:
 *	"Begin": rcu_barrier_callback() started.
 *	"Check": rcu_barrier_callback() checking for piggybacking.
 *	"EarlyExit": rcu_barrier_callback() piggybacked, thus early exit.
 *	"Inc1": rcu_barrier_callback() piggyback check counter incremented.
 *	"Offline": rcu_barrier_callback() found offline CPU
 *	"OnlineNoCB": rcu_barrier_callback() found online no-CBs CPU.
 *	"OnlineQ": rcu_barrier_callback() found online CPU with callbacks.
 *	"OnlineNQ": rcu_barrier_callback() found online CPU, no callbacks.
 *	"IRQ": An rcu_barrier_callback() callback posted on remote CPU.
 *	"CB": An rcu_barrier_callback() invoked a callback, not the last.
 *	"LastCB": An rcu_barrier_callback() invoked the last callback.
 *	"Inc2": rcu_barrier_callback() piggyback check counter incremented.
 * The "cpu" argument is the CPU or -1 if meaningless, the "cnt" argument
 * is the count of remaining callbacks, and "done" is the piggybacking count.
 */
TRACE_EVENT(rcu_barrier,

	TP_PROTO(const char *rcuname, const char *s, int cpu, int cnt, unsigned long done),

	TP_ARGS(rcuname, s, cpu, cnt, done),

	TP_STRUCT__entry(
		__field(const char *, rcuname)
		__field(const char *, s)
		__field(int, cpu)
		__field(int, cnt)
		__field(unsigned long, done)
	),

	TP_fast_assign(
		__entry->rcuname = rcuname;
		__entry->s = s;
		__entry->cpu = cpu;
		__entry->cnt = cnt;
		__entry->done = done;
	),

	TP_printk("%s %s cpu %d remaining %d # %lu",
		  __entry->rcuname, __entry->s, __entry->cpu, __entry->cnt,
		  __entry->done)
);

#else /* #ifdef CONFIG_RCU_TRACE */

#define trace_rcu_grace_period(rcuname, gpnum, gpevent) do { } while (0)
#define trace_rcu_grace_period_init(rcuname, gpnum, level, grplo, grphi, \
				    qsmask) do { } while (0)
#define trace_rcu_future_grace_period(rcuname, gpnum, completed, c, \
				      level, grplo, grphi, event) \
				      do { } while (0)
#define trace_rcu_nocb_wake(rcuname, cpu, reason) do { } while (0)
#define trace_rcu_preempt_task(rcuname, pid, gpnum) do { } while (0)
#define trace_rcu_unlock_preempted_task(rcuname, gpnum, pid) do { } while (0)
#define trace_rcu_quiescent_state_report(rcuname, gpnum, mask, qsmask, level, \
					 grplo, grphi, gp_tasks) do { } \
	while (0)
#define trace_rcu_fqs(rcuname, gpnum, cpu, qsevent) do { } while (0)
#define trace_rcu_dyntick(polarity, oldnesting, newnesting) do { } while (0)
#define trace_rcu_prep_idle(reason) do { } while (0)
#define trace_rcu_callback(rcuname, rhp, qlen_lazy, qlen) do { } while (0)
#define trace_rcu_kfree_callback(rcuname, rhp, offset, qlen_lazy, qlen) \
	do { } while (0)
#define trace_rcu_batch_start(rcuname, qlen_lazy, qlen, blimit) \
	do { } while (0)
#define trace_rcu_invoke_callback(rcuname, rhp) do { } while (0)
#define trace_rcu_invoke_kfree_callback(rcuname, rhp, offset) do { } while (0)
#define trace_rcu_batch_end(rcuname, callbacks_invoked, cb, nr, iit, risk) \
	do { } while (0)
#define trace_rcu_torture_read(rcutorturename, rhp, secs, c_old, c) \
	do { } while (0)
#define trace_rcu_barrier(name, s, cpu, cnt, done) do { } while (0)

#endif /* #else #ifdef CONFIG_RCU_TRACE */

#endif /* _TRACE_RCU_H */

/* This part must be outside protection */
#include <trace/define_trace.h>