summaryrefslogtreecommitdiff
path: root/include/trace/events/rcu.h
blob: 759e7e83733d61db09ac167027c64365dfcfc2b7 (plain)
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
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
/* SPDX-License-Identifier: GPL-2.0 */
#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_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.
 *	"cpuofl-bgp": CPU goes offline while blocking a grace period.
 *	"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 gp_seq, const char *gpevent),

	TP_ARGS(rcuname, gp_seq, gpevent),

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

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

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

/*
 * Tracepoint for future grace-period events.  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 grace period based on leaf-node data.
 * "Prestarted": Someone beat us to the request
 * "Startedleaf": Leaf node marked for future GP.
 * "Startedleafroot": All nodes from leaf to root marked for future GP.
 * "Startedroot": Requested a nocb grace period based on root-node data.
 * "NoGPkthread": The RCU grace-period kthread has not yet started.
 * "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 GP is needed.
 */
TRACE_EVENT(rcu_future_grace_period,

	TP_PROTO(const char *rcuname, unsigned long gp_seq,
		 unsigned long gp_seq_req, u8 level, int grplo, int grphi,
		 const char *gpevent),

	TP_ARGS(rcuname, gp_seq, gp_seq_req, level, grplo, grphi, gpevent),

	TP_STRUCT__entry(
		__field(const char *, rcuname)
		__field(unsigned long, gp_seq)
		__field(unsigned long, gp_seq_req)
		__field(u8, level)
		__field(int, grplo)
		__field(int, grphi)
		__field(const char *, gpevent)
	),

	TP_fast_assign(
		__entry->rcuname = rcuname;
		__entry->gp_seq = gp_seq;
		__entry->gp_seq_req = gp_seq_req;
		__entry->level = level;
		__entry->grplo = grplo;
		__entry->grphi = grphi;
		__entry->gpevent = gpevent;
	),

	TP_printk("%s %lu %lu %u %d %d %s",
		  __entry->rcuname, __entry->gp_seq, __entry->gp_seq_req, __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 gp_seq, u8 level,
		 int grplo, int grphi, unsigned long qsmask),

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

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

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

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

/*
 * Tracepoint for expedited grace-period events.  Takes a string identifying
 * the RCU flavor, the expedited grace-period sequence number, and a string
 * identifying the grace-period-related event as follows:
 *
 *	"snap": Captured snapshot of expedited grace period sequence number.
 *	"start": Started a real expedited grace period.
 *	"reset": Started resetting the tree
 *	"select": Started selecting the CPUs to wait on.
 *	"selectofl": Selected CPU partially offline.
 *	"startwait": Started waiting on selected CPUs.
 *	"end": Ended a real expedited grace period.
 *	"endwake": Woke piggybackers up.
 *	"done": Someone else did the expedited grace period for us.
 */
TRACE_EVENT(rcu_exp_grace_period,

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

	TP_ARGS(rcuname, gpseq, gpevent),

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

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

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

/*
 * Tracepoint for expedited grace-period funnel-locking events.  Takes a
 * string identifying the RCU flavor, an integer identifying the rcu_node
 * combining-tree level, another pair of integers identifying the lowest-
 * and highest-numbered CPU associated with the current rcu_node structure,
 * and a string.  identifying the grace-period-related event as follows:
 *
 *	"nxtlvl": Advance to next level of rcu_node funnel
 *	"wait": Wait for someone else to do expedited GP
 */
TRACE_EVENT(rcu_exp_funnel_lock,

	TP_PROTO(const char *rcuname, u8 level, int grplo, int grphi,
		 const char *gpevent),

	TP_ARGS(rcuname, level, grplo, grphi, gpevent),

	TP_STRUCT__entry(
		__field(const char *, rcuname)
		__field(u8, level)
		__field(int, grplo)
		__field(int, grphi)
		__field(const char *, gpevent)
	),

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

	TP_printk("%s %d %d %d %s",
		  __entry->rcuname, __entry->level, __entry->grplo,
		  __entry->grphi, __entry->gpevent)
);

#ifdef CONFIG_RCU_NOCB_CPU
/*
 * 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.
 *	"WakeEmptyIsDeferred": Wake rcuo kthread later, first CB to empty list.
 *	"WakeOvf": Wake rcuo kthread, CB list is huge.
 *	"WakeOvfIsDeferred": Wake rcuo kthread later, CB list is huge.
 *	"WakeNot": Don't wake rcuo kthread.
 *	"WakeNotPoll": Don't wake rcuo kthread because it is polling.
 *	"DeferredWake": Carried out the "IsDeferred" wakeup.
 *	"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)
);
#endif

/*
 * 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 gp_seq),

	TP_ARGS(rcuname, pid, gp_seq),

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

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

	TP_printk("%s %lu %d",
		  __entry->rcuname, __entry->gp_seq, __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 gp_seq, int pid),

	TP_ARGS(rcuname, gp_seq, pid),

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

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

	TP_printk("%s %lu %d", __entry->rcuname, __entry->gp_seq, __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 gp_seq,
		 unsigned long mask, unsigned long qsmask,
		 u8 level, int grplo, int grphi, int gp_tasks),

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

	TP_STRUCT__entry(
		__field(const char *, rcuname)
		__field(unsigned long, gp_seq)
		__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->gp_seq = gp_seq;
		__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->gp_seq,
		  __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, "kick"
 * when kicking a CPU that has been in dyntick-idle mode for too long, or
 * "rqc" if the CPU got a quiescent state via its rcu_qs_ctr.
 */
TRACE_EVENT(rcu_fqs,

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

	TP_ARGS(rcuname, gp_seq, cpu, qsevent),

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

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

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

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

/*
 * Tracepoint for dyntick-idle entry/exit events.  These take a string
 * as argument: "Start" for entering dyntick-idle mode, "Startirq" for
 * entering it from irq/NMI, "End" for leaving it, "Endirq" for leaving it
 * to irq/NMI, "--=" for events moving towards idle, and "++=" for events
 * moving away from idle.
 *
 * These events also take a pair of numbers, which indicate the nesting
 * depth before and after the event of interest, and a third number that is
 * the ->dynticks counter.  Note that task-related and interrupt-related
 * events use two separate counters, and that the "++=" and "--=" events
 * for irq/NMI will change the counter by two, otherwise by one.
 */
TRACE_EVENT(rcu_dyntick,

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

	TP_ARGS(polarity, oldnesting, newnesting, dynticks),

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

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

	TP_printk("%s %lx %lx %#3x", __entry->polarity,
		  __entry->oldnesting, __entry->newnesting,
		  __entry->dynticks & 0xfff)
);

/*
 * 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.  The third argument is the start time in
 * seconds, and the last two arguments are the grace period numbers
 * at the beginning and end of the read, respectively.  Note that the
 * callback address can be NULL.
 */
#define RCUTORTURENAME_LEN 8
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(char, rcutorturename[RCUTORTURENAME_LEN])
		__field(struct rcu_head *, rhp)
		__field(unsigned long, secs)
		__field(unsigned long, c_old)
		__field(unsigned long, c)
	),

	TP_fast_assign(
		strncpy(__entry->rcutorturename, rcutorturename,
			RCUTORTURENAME_LEN);
		__entry->rcutorturename[RCUTORTURENAME_LEN - 1] = 0;
		__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() started.
 *	"EarlyExit": _rcu_barrier() piggybacked, thus early exit.
 *	"Inc1": _rcu_barrier() piggyback check counter incremented.
 *	"OfflineNoCB": _rcu_barrier() found callback on never-online CPU
 *	"OnlineNoCB": _rcu_barrier() found online no-CBs CPU.
 *	"OnlineQ": _rcu_barrier() found online CPU with callbacks.
 *	"OnlineNQ": _rcu_barrier() found online CPU, no callbacks.
 *	"IRQ": An rcu_barrier_callback() callback posted on remote CPU.
 *	"IRQNQ": An rcu_barrier_callback() callback found no callbacks.
 *	"CB": An rcu_barrier_callback() invoked a callback, not the last.
 *	"LastCB": An rcu_barrier_callback() invoked the last callback.
 *	"Inc2": _rcu_barrier() 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, gp_seq, gpevent) do { } while (0)
#define trace_rcu_future_grace_period(rcuname, gp_seq, gp_seq_req, \
				      level, grplo, grphi, event) \
				      do { } while (0)
#define trace_rcu_grace_period_init(rcuname, gp_seq, level, grplo, grphi, \
				    qsmask) do { } while (0)
#define trace_rcu_exp_grace_period(rcuname, gqseq, gpevent) \
	do { } while (0)
#define trace_rcu_exp_funnel_lock(rcuname, level, grplo, grphi, gpevent) \
	do { } while (0)
#define trace_rcu_nocb_wake(rcuname, cpu, reason) do { } while (0)
#define trace_rcu_preempt_task(rcuname, pid, gp_seq) do { } while (0)
#define trace_rcu_unlock_preempted_task(rcuname, gp_seq, pid) do { } while (0)
#define trace_rcu_quiescent_state_report(rcuname, gp_seq, mask, qsmask, level, \
					 grplo, grphi, gp_tasks) do { } \
	while (0)
#define trace_rcu_fqs(rcuname, gp_seq, cpu, qsevent) do { } while (0)
#define trace_rcu_dyntick(polarity, oldnesting, newnesting, dyntick) 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>