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1/* SPDX-License-Identifier: GPL-2.0 */
2#undef TRACE_SYSTEM
3#define TRACE_SYSTEM rcu
4
5#if !defined(_TRACE_RCU_H) || defined(TRACE_HEADER_MULTI_READ)
6#define _TRACE_RCU_H
7
8#include <linux/tracepoint.h>
9
10#ifdef CONFIG_RCU_TRACE
11#define TRACE_EVENT_RCU TRACE_EVENT
12#else
13#define TRACE_EVENT_RCU TRACE_EVENT_NOP
14#endif
15
16/*
17 * Tracepoint for start/end markers used for utilization calculations.
18 * By convention, the string is of the following forms:
19 *
20 * "Start <activity>" -- Mark the start of the specified activity,
21 * such as "context switch". Nesting is permitted.
22 * "End <activity>" -- Mark the end of the specified activity.
23 *
24 * An "@" character within "<activity>" is a comment character: Data
25 * reduction scripts will ignore the "@" and the remainder of the line.
26 */
27TRACE_EVENT(rcu_utilization,
28
29 TP_PROTO(const char *s),
30
31 TP_ARGS(s),
32
33 TP_STRUCT__entry(
34 __field(const char *, s)
35 ),
36
37 TP_fast_assign(
38 __entry->s = s;
39 ),
40
41 TP_printk("%s", __entry->s)
42);
43
44#if defined(CONFIG_TREE_RCU)
45
46/*
47 * Tracepoint for grace-period events. Takes a string identifying the
48 * RCU flavor, the grace-period number, and a string identifying the
49 * grace-period-related event as follows:
50 *
51 * "AccReadyCB": CPU accelerates new callbacks to RCU_NEXT_READY_TAIL.
52 * "AccWaitCB": CPU accelerates new callbacks to RCU_WAIT_TAIL.
53 * "newreq": Request a new grace period.
54 * "start": Start a grace period.
55 * "cpustart": CPU first notices a grace-period start.
56 * "cpuqs": CPU passes through a quiescent state.
57 * "cpuonl": CPU comes online.
58 * "cpuofl": CPU goes offline.
59 * "cpuofl-bgp": CPU goes offline while blocking a grace period.
60 * "reqwait": GP kthread sleeps waiting for grace-period request.
61 * "reqwaitsig": GP kthread awakened by signal from reqwait state.
62 * "fqswait": GP kthread waiting until time to force quiescent states.
63 * "fqsstart": GP kthread starts forcing quiescent states.
64 * "fqsend": GP kthread done forcing quiescent states.
65 * "fqswaitsig": GP kthread awakened by signal from fqswait state.
66 * "end": End a grace period.
67 * "cpuend": CPU first notices a grace-period end.
68 */
69TRACE_EVENT_RCU(rcu_grace_period,
70
71 TP_PROTO(const char *rcuname, unsigned long gp_seq, const char *gpevent),
72
73 TP_ARGS(rcuname, gp_seq, gpevent),
74
75 TP_STRUCT__entry(
76 __field(const char *, rcuname)
77 __field(long, gp_seq)
78 __field(const char *, gpevent)
79 ),
80
81 TP_fast_assign(
82 __entry->rcuname = rcuname;
83 __entry->gp_seq = (long)gp_seq;
84 __entry->gpevent = gpevent;
85 ),
86
87 TP_printk("%s %ld %s",
88 __entry->rcuname, __entry->gp_seq, __entry->gpevent)
89);
90
91/*
92 * Tracepoint for future grace-period events. The caller should pull
93 * the data from the rcu_node structure, other than rcuname, which comes
94 * from the rcu_state structure, and event, which is one of the following:
95 *
96 * "Cleanup": Clean up rcu_node structure after previous GP.
97 * "CleanupMore": Clean up, and another GP is needed.
98 * "EndWait": Complete wait.
99 * "NoGPkthread": The RCU grace-period kthread has not yet started.
100 * "Prestarted": Someone beat us to the request
101 * "Startedleaf": Leaf node marked for future GP.
102 * "Startedleafroot": All nodes from leaf to root marked for future GP.
103 * "Startedroot": Requested a nocb grace period based on root-node data.
104 * "Startleaf": Request a grace period based on leaf-node data.
105 * "StartWait": Start waiting for the requested grace period.
106 */
107TRACE_EVENT_RCU(rcu_future_grace_period,
108
109 TP_PROTO(const char *rcuname, unsigned long gp_seq,
110 unsigned long gp_seq_req, u8 level, int grplo, int grphi,
111 const char *gpevent),
112
113 TP_ARGS(rcuname, gp_seq, gp_seq_req, level, grplo, grphi, gpevent),
114
115 TP_STRUCT__entry(
116 __field(const char *, rcuname)
117 __field(long, gp_seq)
118 __field(long, gp_seq_req)
119 __field(u8, level)
120 __field(int, grplo)
121 __field(int, grphi)
122 __field(const char *, gpevent)
123 ),
124
125 TP_fast_assign(
126 __entry->rcuname = rcuname;
127 __entry->gp_seq = (long)gp_seq;
128 __entry->gp_seq_req = (long)gp_seq_req;
129 __entry->level = level;
130 __entry->grplo = grplo;
131 __entry->grphi = grphi;
132 __entry->gpevent = gpevent;
133 ),
134
135 TP_printk("%s %ld %ld %u %d %d %s",
136 __entry->rcuname, (long)__entry->gp_seq, (long)__entry->gp_seq_req, __entry->level,
137 __entry->grplo, __entry->grphi, __entry->gpevent)
138);
139
140/*
141 * Tracepoint for grace-period-initialization events. These are
142 * distinguished by the type of RCU, the new grace-period number, the
143 * rcu_node structure level, the starting and ending CPU covered by the
144 * rcu_node structure, and the mask of CPUs that will be waited for.
145 * All but the type of RCU are extracted from the rcu_node structure.
146 */
147TRACE_EVENT_RCU(rcu_grace_period_init,
148
149 TP_PROTO(const char *rcuname, unsigned long gp_seq, u8 level,
150 int grplo, int grphi, unsigned long qsmask),
151
152 TP_ARGS(rcuname, gp_seq, level, grplo, grphi, qsmask),
153
154 TP_STRUCT__entry(
155 __field(const char *, rcuname)
156 __field(long, gp_seq)
157 __field(u8, level)
158 __field(int, grplo)
159 __field(int, grphi)
160 __field(unsigned long, qsmask)
161 ),
162
163 TP_fast_assign(
164 __entry->rcuname = rcuname;
165 __entry->gp_seq = (long)gp_seq;
166 __entry->level = level;
167 __entry->grplo = grplo;
168 __entry->grphi = grphi;
169 __entry->qsmask = qsmask;
170 ),
171
172 TP_printk("%s %ld %u %d %d %lx",
173 __entry->rcuname, __entry->gp_seq, __entry->level,
174 __entry->grplo, __entry->grphi, __entry->qsmask)
175);
176
177/*
178 * Tracepoint for expedited grace-period events. Takes a string identifying
179 * the RCU flavor, the expedited grace-period sequence number, and a string
180 * identifying the grace-period-related event as follows:
181 *
182 * "snap": Captured snapshot of expedited grace period sequence number.
183 * "start": Started a real expedited grace period.
184 * "reset": Started resetting the tree
185 * "select": Started selecting the CPUs to wait on.
186 * "selectofl": Selected CPU partially offline.
187 * "startwait": Started waiting on selected CPUs.
188 * "end": Ended a real expedited grace period.
189 * "endwake": Woke piggybackers up.
190 * "done": Someone else did the expedited grace period for us.
191 */
192TRACE_EVENT_RCU(rcu_exp_grace_period,
193
194 TP_PROTO(const char *rcuname, unsigned long gpseq, const char *gpevent),
195
196 TP_ARGS(rcuname, gpseq, gpevent),
197
198 TP_STRUCT__entry(
199 __field(const char *, rcuname)
200 __field(long, gpseq)
201 __field(const char *, gpevent)
202 ),
203
204 TP_fast_assign(
205 __entry->rcuname = rcuname;
206 __entry->gpseq = (long)gpseq;
207 __entry->gpevent = gpevent;
208 ),
209
210 TP_printk("%s %ld %s",
211 __entry->rcuname, __entry->gpseq, __entry->gpevent)
212);
213
214/*
215 * Tracepoint for expedited grace-period funnel-locking events. Takes a
216 * string identifying the RCU flavor, an integer identifying the rcu_node
217 * combining-tree level, another pair of integers identifying the lowest-
218 * and highest-numbered CPU associated with the current rcu_node structure,
219 * and a string. identifying the grace-period-related event as follows:
220 *
221 * "nxtlvl": Advance to next level of rcu_node funnel
222 * "wait": Wait for someone else to do expedited GP
223 */
224TRACE_EVENT_RCU(rcu_exp_funnel_lock,
225
226 TP_PROTO(const char *rcuname, u8 level, int grplo, int grphi,
227 const char *gpevent),
228
229 TP_ARGS(rcuname, level, grplo, grphi, gpevent),
230
231 TP_STRUCT__entry(
232 __field(const char *, rcuname)
233 __field(u8, level)
234 __field(int, grplo)
235 __field(int, grphi)
236 __field(const char *, gpevent)
237 ),
238
239 TP_fast_assign(
240 __entry->rcuname = rcuname;
241 __entry->level = level;
242 __entry->grplo = grplo;
243 __entry->grphi = grphi;
244 __entry->gpevent = gpevent;
245 ),
246
247 TP_printk("%s %d %d %d %s",
248 __entry->rcuname, __entry->level, __entry->grplo,
249 __entry->grphi, __entry->gpevent)
250);
251
252#ifdef CONFIG_RCU_NOCB_CPU
253/*
254 * Tracepoint for RCU no-CBs CPU callback handoffs. This event is intended
255 * to assist debugging of these handoffs.
256 *
257 * The first argument is the name of the RCU flavor, and the second is
258 * the number of the offloaded CPU are extracted. The third and final
259 * argument is a string as follows:
260 *
261 * "AlreadyAwake": The to-be-awakened rcuo kthread is already awake.
262 * "Bypass": rcuo GP kthread sees non-empty ->nocb_bypass.
263 * "CBSleep": rcuo CB kthread sleeping waiting for CBs.
264 * "Check": rcuo GP kthread checking specified CPU for work.
265 * "DeferredWake": Timer expired or polled check, time to wake.
266 * "DoWake": The to-be-awakened rcuo kthread needs to be awakened.
267 * "EndSleep": Done waiting for GP for !rcu_nocb_poll.
268 * "FirstBQ": New CB to empty ->nocb_bypass (->cblist maybe non-empty).
269 * "FirstBQnoWake": FirstBQ plus rcuo kthread need not be awakened.
270 * "FirstBQwake": FirstBQ plus rcuo kthread must be awakened.
271 * "FirstQ": New CB to empty ->cblist (->nocb_bypass maybe non-empty).
272 * "NeedWaitGP": rcuo GP kthread must wait on a grace period.
273 * "Poll": Start of new polling cycle for rcu_nocb_poll.
274 * "Sleep": Sleep waiting for GP for !rcu_nocb_poll.
275 * "Timer": Deferred-wake timer expired.
276 * "WakeEmptyIsDeferred": Wake rcuo kthread later, first CB to empty list.
277 * "WakeEmpty": Wake rcuo kthread, first CB to empty list.
278 * "WakeNot": Don't wake rcuo kthread.
279 * "WakeNotPoll": Don't wake rcuo kthread because it is polling.
280 * "WakeOvfIsDeferred": Wake rcuo kthread later, CB list is huge.
281 * "WakeBypassIsDeferred": Wake rcuo kthread later, bypass list is contended.
282 * "WokeEmpty": rcuo CB kthread woke to find empty list.
283 */
284TRACE_EVENT_RCU(rcu_nocb_wake,
285
286 TP_PROTO(const char *rcuname, int cpu, const char *reason),
287
288 TP_ARGS(rcuname, cpu, reason),
289
290 TP_STRUCT__entry(
291 __field(const char *, rcuname)
292 __field(int, cpu)
293 __field(const char *, reason)
294 ),
295
296 TP_fast_assign(
297 __entry->rcuname = rcuname;
298 __entry->cpu = cpu;
299 __entry->reason = reason;
300 ),
301
302 TP_printk("%s %d %s", __entry->rcuname, __entry->cpu, __entry->reason)
303);
304#endif
305
306/*
307 * Tracepoint for tasks blocking within preemptible-RCU read-side
308 * critical sections. Track the type of RCU (which one day might
309 * include SRCU), the grace-period number that the task is blocking
310 * (the current or the next), and the task's PID.
311 */
312TRACE_EVENT_RCU(rcu_preempt_task,
313
314 TP_PROTO(const char *rcuname, int pid, unsigned long gp_seq),
315
316 TP_ARGS(rcuname, pid, gp_seq),
317
318 TP_STRUCT__entry(
319 __field(const char *, rcuname)
320 __field(long, gp_seq)
321 __field(int, pid)
322 ),
323
324 TP_fast_assign(
325 __entry->rcuname = rcuname;
326 __entry->gp_seq = (long)gp_seq;
327 __entry->pid = pid;
328 ),
329
330 TP_printk("%s %ld %d",
331 __entry->rcuname, __entry->gp_seq, __entry->pid)
332);
333
334/*
335 * Tracepoint for tasks that blocked within a given preemptible-RCU
336 * read-side critical section exiting that critical section. Track the
337 * type of RCU (which one day might include SRCU) and the task's PID.
338 */
339TRACE_EVENT_RCU(rcu_unlock_preempted_task,
340
341 TP_PROTO(const char *rcuname, unsigned long gp_seq, int pid),
342
343 TP_ARGS(rcuname, gp_seq, pid),
344
345 TP_STRUCT__entry(
346 __field(const char *, rcuname)
347 __field(long, gp_seq)
348 __field(int, pid)
349 ),
350
351 TP_fast_assign(
352 __entry->rcuname = rcuname;
353 __entry->gp_seq = (long)gp_seq;
354 __entry->pid = pid;
355 ),
356
357 TP_printk("%s %ld %d", __entry->rcuname, __entry->gp_seq, __entry->pid)
358);
359
360/*
361 * Tracepoint for quiescent-state-reporting events. These are
362 * distinguished by the type of RCU, the grace-period number, the
363 * mask of quiescent lower-level entities, the rcu_node structure level,
364 * the starting and ending CPU covered by the rcu_node structure, and
365 * whether there are any blocked tasks blocking the current grace period.
366 * All but the type of RCU are extracted from the rcu_node structure.
367 */
368TRACE_EVENT_RCU(rcu_quiescent_state_report,
369
370 TP_PROTO(const char *rcuname, unsigned long gp_seq,
371 unsigned long mask, unsigned long qsmask,
372 u8 level, int grplo, int grphi, int gp_tasks),
373
374 TP_ARGS(rcuname, gp_seq, mask, qsmask, level, grplo, grphi, gp_tasks),
375
376 TP_STRUCT__entry(
377 __field(const char *, rcuname)
378 __field(long, gp_seq)
379 __field(unsigned long, mask)
380 __field(unsigned long, qsmask)
381 __field(u8, level)
382 __field(int, grplo)
383 __field(int, grphi)
384 __field(u8, gp_tasks)
385 ),
386
387 TP_fast_assign(
388 __entry->rcuname = rcuname;
389 __entry->gp_seq = (long)gp_seq;
390 __entry->mask = mask;
391 __entry->qsmask = qsmask;
392 __entry->level = level;
393 __entry->grplo = grplo;
394 __entry->grphi = grphi;
395 __entry->gp_tasks = gp_tasks;
396 ),
397
398 TP_printk("%s %ld %lx>%lx %u %d %d %u",
399 __entry->rcuname, __entry->gp_seq,
400 __entry->mask, __entry->qsmask, __entry->level,
401 __entry->grplo, __entry->grphi, __entry->gp_tasks)
402);
403
404/*
405 * Tracepoint for quiescent states detected by force_quiescent_state().
406 * These trace events include the type of RCU, the grace-period number
407 * that was blocked by the CPU, the CPU itself, and the type of quiescent
408 * state, which can be "dti" for dyntick-idle mode or "kick" when kicking
409 * a CPU that has been in dyntick-idle mode for too long.
410 */
411TRACE_EVENT_RCU(rcu_fqs,
412
413 TP_PROTO(const char *rcuname, unsigned long gp_seq, int cpu, const char *qsevent),
414
415 TP_ARGS(rcuname, gp_seq, cpu, qsevent),
416
417 TP_STRUCT__entry(
418 __field(const char *, rcuname)
419 __field(long, gp_seq)
420 __field(int, cpu)
421 __field(const char *, qsevent)
422 ),
423
424 TP_fast_assign(
425 __entry->rcuname = rcuname;
426 __entry->gp_seq = (long)gp_seq;
427 __entry->cpu = cpu;
428 __entry->qsevent = qsevent;
429 ),
430
431 TP_printk("%s %ld %d %s",
432 __entry->rcuname, __entry->gp_seq,
433 __entry->cpu, __entry->qsevent)
434);
435
436/*
437 * Tracepoint for RCU stall events. Takes a string identifying the RCU flavor
438 * and a string identifying which function detected the RCU stall as follows:
439 *
440 * "StallDetected": Scheduler-tick detects other CPU's stalls.
441 * "SelfDetected": Scheduler-tick detects a current CPU's stall.
442 * "ExpeditedStall": Expedited grace period detects stalls.
443 */
444TRACE_EVENT(rcu_stall_warning,
445
446 TP_PROTO(const char *rcuname, const char *msg),
447
448 TP_ARGS(rcuname, msg),
449
450 TP_STRUCT__entry(
451 __field(const char *, rcuname)
452 __field(const char *, msg)
453 ),
454
455 TP_fast_assign(
456 __entry->rcuname = rcuname;
457 __entry->msg = msg;
458 ),
459
460 TP_printk("%s %s",
461 __entry->rcuname, __entry->msg)
462);
463
464#endif /* #if defined(CONFIG_TREE_RCU) */
465
466/*
467 * Tracepoint for dyntick-idle entry/exit events. These take 2 strings
468 * as argument:
469 * polarity: "Start", "End", "StillNonIdle" for entering, exiting or still not
470 * being in dyntick-idle mode.
471 * context: "USER" or "IDLE" or "IRQ".
472 * NMIs nested in IRQs are inferred with dynticks_nesting > 1 in IRQ context.
473 *
474 * These events also take a pair of numbers, which indicate the nesting
475 * depth before and after the event of interest, and a third number that is
476 * the ->dynticks counter. Note that task-related and interrupt-related
477 * events use two separate counters, and that the "++=" and "--=" events
478 * for irq/NMI will change the counter by two, otherwise by one.
479 */
480TRACE_EVENT_RCU(rcu_dyntick,
481
482 TP_PROTO(const char *polarity, long oldnesting, long newnesting, int dynticks),
483
484 TP_ARGS(polarity, oldnesting, newnesting, dynticks),
485
486 TP_STRUCT__entry(
487 __field(const char *, polarity)
488 __field(long, oldnesting)
489 __field(long, newnesting)
490 __field(int, dynticks)
491 ),
492
493 TP_fast_assign(
494 __entry->polarity = polarity;
495 __entry->oldnesting = oldnesting;
496 __entry->newnesting = newnesting;
497 __entry->dynticks = dynticks;
498 ),
499
500 TP_printk("%s %lx %lx %#3x", __entry->polarity,
501 __entry->oldnesting, __entry->newnesting,
502 __entry->dynticks & 0xfff)
503);
504
505/*
506 * Tracepoint for the registration of a single RCU callback function.
507 * The first argument is the type of RCU, the second argument is
508 * a pointer to the RCU callback itself, the third element is the
509 * number of lazy callbacks queued, and the fourth element is the
510 * total number of callbacks queued.
511 */
512TRACE_EVENT_RCU(rcu_callback,
513
514 TP_PROTO(const char *rcuname, struct rcu_head *rhp, long qlen),
515
516 TP_ARGS(rcuname, rhp, qlen),
517
518 TP_STRUCT__entry(
519 __field(const char *, rcuname)
520 __field(void *, rhp)
521 __field(void *, func)
522 __field(long, qlen)
523 ),
524
525 TP_fast_assign(
526 __entry->rcuname = rcuname;
527 __entry->rhp = rhp;
528 __entry->func = rhp->func;
529 __entry->qlen = qlen;
530 ),
531
532 TP_printk("%s rhp=%p func=%ps %ld",
533 __entry->rcuname, __entry->rhp, __entry->func,
534 __entry->qlen)
535);
536
537TRACE_EVENT_RCU(rcu_segcb_stats,
538
539 TP_PROTO(struct rcu_segcblist *rs, const char *ctx),
540
541 TP_ARGS(rs, ctx),
542
543 TP_STRUCT__entry(
544 __field(const char *, ctx)
545 __array(unsigned long, gp_seq, RCU_CBLIST_NSEGS)
546 __array(long, seglen, RCU_CBLIST_NSEGS)
547 ),
548
549 TP_fast_assign(
550 __entry->ctx = ctx;
551 memcpy(__entry->seglen, rs->seglen, RCU_CBLIST_NSEGS * sizeof(long));
552 memcpy(__entry->gp_seq, rs->gp_seq, RCU_CBLIST_NSEGS * sizeof(unsigned long));
553
554 ),
555
556 TP_printk("%s seglen: (DONE=%ld, WAIT=%ld, NEXT_READY=%ld, NEXT=%ld) "
557 "gp_seq: (DONE=%lu, WAIT=%lu, NEXT_READY=%lu, NEXT=%lu)", __entry->ctx,
558 __entry->seglen[0], __entry->seglen[1], __entry->seglen[2], __entry->seglen[3],
559 __entry->gp_seq[0], __entry->gp_seq[1], __entry->gp_seq[2], __entry->gp_seq[3])
560
561);
562
563/*
564 * Tracepoint for the registration of a single RCU callback of the special
565 * kvfree() form. The first argument is the RCU type, the second argument
566 * is a pointer to the RCU callback, the third argument is the offset
567 * of the callback within the enclosing RCU-protected data structure,
568 * the fourth argument is the number of lazy callbacks queued, and the
569 * fifth argument is the total number of callbacks queued.
570 */
571TRACE_EVENT_RCU(rcu_kvfree_callback,
572
573 TP_PROTO(const char *rcuname, struct rcu_head *rhp, unsigned long offset,
574 long qlen),
575
576 TP_ARGS(rcuname, rhp, offset, qlen),
577
578 TP_STRUCT__entry(
579 __field(const char *, rcuname)
580 __field(void *, rhp)
581 __field(unsigned long, offset)
582 __field(long, qlen)
583 ),
584
585 TP_fast_assign(
586 __entry->rcuname = rcuname;
587 __entry->rhp = rhp;
588 __entry->offset = offset;
589 __entry->qlen = qlen;
590 ),
591
592 TP_printk("%s rhp=%p func=%ld %ld",
593 __entry->rcuname, __entry->rhp, __entry->offset,
594 __entry->qlen)
595);
596
597/*
598 * Tracepoint for marking the beginning rcu_do_batch, performed to start
599 * RCU callback invocation. The first argument is the RCU flavor,
600 * the second is the number of lazy callbacks queued, the third is
601 * the total number of callbacks queued, and the fourth argument is
602 * the current RCU-callback batch limit.
603 */
604TRACE_EVENT_RCU(rcu_batch_start,
605
606 TP_PROTO(const char *rcuname, long qlen, long blimit),
607
608 TP_ARGS(rcuname, qlen, blimit),
609
610 TP_STRUCT__entry(
611 __field(const char *, rcuname)
612 __field(long, qlen)
613 __field(long, blimit)
614 ),
615
616 TP_fast_assign(
617 __entry->rcuname = rcuname;
618 __entry->qlen = qlen;
619 __entry->blimit = blimit;
620 ),
621
622 TP_printk("%s CBs=%ld bl=%ld",
623 __entry->rcuname, __entry->qlen, __entry->blimit)
624);
625
626/*
627 * Tracepoint for the invocation of a single RCU callback function.
628 * The first argument is the type of RCU, and the second argument is
629 * a pointer to the RCU callback itself.
630 */
631TRACE_EVENT_RCU(rcu_invoke_callback,
632
633 TP_PROTO(const char *rcuname, struct rcu_head *rhp),
634
635 TP_ARGS(rcuname, rhp),
636
637 TP_STRUCT__entry(
638 __field(const char *, rcuname)
639 __field(void *, rhp)
640 __field(void *, func)
641 ),
642
643 TP_fast_assign(
644 __entry->rcuname = rcuname;
645 __entry->rhp = rhp;
646 __entry->func = rhp->func;
647 ),
648
649 TP_printk("%s rhp=%p func=%ps",
650 __entry->rcuname, __entry->rhp, __entry->func)
651);
652
653/*
654 * Tracepoint for the invocation of a single RCU callback of the special
655 * kvfree() form. The first argument is the RCU flavor, the second
656 * argument is a pointer to the RCU callback, and the third argument
657 * is the offset of the callback within the enclosing RCU-protected
658 * data structure.
659 */
660TRACE_EVENT_RCU(rcu_invoke_kvfree_callback,
661
662 TP_PROTO(const char *rcuname, struct rcu_head *rhp, unsigned long offset),
663
664 TP_ARGS(rcuname, rhp, offset),
665
666 TP_STRUCT__entry(
667 __field(const char *, rcuname)
668 __field(void *, rhp)
669 __field(unsigned long, offset)
670 ),
671
672 TP_fast_assign(
673 __entry->rcuname = rcuname;
674 __entry->rhp = rhp;
675 __entry->offset = offset;
676 ),
677
678 TP_printk("%s rhp=%p func=%ld",
679 __entry->rcuname, __entry->rhp, __entry->offset)
680);
681
682/*
683 * Tracepoint for the invocation of a single RCU callback of the special
684 * kfree_bulk() form. The first argument is the RCU flavor, the second
685 * argument is a number of elements in array to free, the third is an
686 * address of the array holding nr_records entries.
687 */
688TRACE_EVENT_RCU(rcu_invoke_kfree_bulk_callback,
689
690 TP_PROTO(const char *rcuname, unsigned long nr_records, void **p),
691
692 TP_ARGS(rcuname, nr_records, p),
693
694 TP_STRUCT__entry(
695 __field(const char *, rcuname)
696 __field(unsigned long, nr_records)
697 __field(void **, p)
698 ),
699
700 TP_fast_assign(
701 __entry->rcuname = rcuname;
702 __entry->nr_records = nr_records;
703 __entry->p = p;
704 ),
705
706 TP_printk("%s bulk=0x%p nr_records=%lu",
707 __entry->rcuname, __entry->p, __entry->nr_records)
708);
709
710/*
711 * Tracepoint for exiting rcu_do_batch after RCU callbacks have been
712 * invoked. The first argument is the name of the RCU flavor,
713 * the second argument is number of callbacks actually invoked,
714 * the third argument (cb) is whether or not any of the callbacks that
715 * were ready to invoke at the beginning of this batch are still
716 * queued, the fourth argument (nr) is the return value of need_resched(),
717 * the fifth argument (iit) is 1 if the current task is the idle task,
718 * and the sixth argument (risk) is the return value from
719 * rcu_is_callbacks_kthread().
720 */
721TRACE_EVENT_RCU(rcu_batch_end,
722
723 TP_PROTO(const char *rcuname, int callbacks_invoked,
724 char cb, char nr, char iit, char risk),
725
726 TP_ARGS(rcuname, callbacks_invoked, cb, nr, iit, risk),
727
728 TP_STRUCT__entry(
729 __field(const char *, rcuname)
730 __field(int, callbacks_invoked)
731 __field(char, cb)
732 __field(char, nr)
733 __field(char, iit)
734 __field(char, risk)
735 ),
736
737 TP_fast_assign(
738 __entry->rcuname = rcuname;
739 __entry->callbacks_invoked = callbacks_invoked;
740 __entry->cb = cb;
741 __entry->nr = nr;
742 __entry->iit = iit;
743 __entry->risk = risk;
744 ),
745
746 TP_printk("%s CBs-invoked=%d idle=%c%c%c%c",
747 __entry->rcuname, __entry->callbacks_invoked,
748 __entry->cb ? 'C' : '.',
749 __entry->nr ? 'S' : '.',
750 __entry->iit ? 'I' : '.',
751 __entry->risk ? 'R' : '.')
752);
753
754/*
755 * Tracepoint for rcutorture readers. The first argument is the name
756 * of the RCU flavor from rcutorture's viewpoint and the second argument
757 * is the callback address. The third argument is the start time in
758 * seconds, and the last two arguments are the grace period numbers
759 * at the beginning and end of the read, respectively. Note that the
760 * callback address can be NULL.
761 */
762#define RCUTORTURENAME_LEN 8
763TRACE_EVENT_RCU(rcu_torture_read,
764
765 TP_PROTO(const char *rcutorturename, struct rcu_head *rhp,
766 unsigned long secs, unsigned long c_old, unsigned long c),
767
768 TP_ARGS(rcutorturename, rhp, secs, c_old, c),
769
770 TP_STRUCT__entry(
771 __field(char, rcutorturename[RCUTORTURENAME_LEN])
772 __field(struct rcu_head *, rhp)
773 __field(unsigned long, secs)
774 __field(unsigned long, c_old)
775 __field(unsigned long, c)
776 ),
777
778 TP_fast_assign(
779 strncpy(__entry->rcutorturename, rcutorturename,
780 RCUTORTURENAME_LEN);
781 __entry->rcutorturename[RCUTORTURENAME_LEN - 1] = 0;
782 __entry->rhp = rhp;
783 __entry->secs = secs;
784 __entry->c_old = c_old;
785 __entry->c = c;
786 ),
787
788 TP_printk("%s torture read %p %luus c: %lu %lu",
789 __entry->rcutorturename, __entry->rhp,
790 __entry->secs, __entry->c_old, __entry->c)
791);
792
793/*
794 * Tracepoint for rcu_barrier() execution. The string "s" describes
795 * the rcu_barrier phase:
796 * "Begin": rcu_barrier() started.
797 * "CB": An rcu_barrier_callback() invoked a callback, not the last.
798 * "EarlyExit": rcu_barrier() piggybacked, thus early exit.
799 * "Inc1": rcu_barrier() piggyback check counter incremented.
800 * "Inc2": rcu_barrier() piggyback check counter incremented.
801 * "IRQ": An rcu_barrier_callback() callback posted on remote CPU.
802 * "IRQNQ": An rcu_barrier_callback() callback found no callbacks.
803 * "LastCB": An rcu_barrier_callback() invoked the last callback.
804 * "NQ": rcu_barrier() found a CPU with no callbacks.
805 * "OnlineQ": rcu_barrier() found online CPU with callbacks.
806 * The "cpu" argument is the CPU or -1 if meaningless, the "cnt" argument
807 * is the count of remaining callbacks, and "done" is the piggybacking count.
808 */
809TRACE_EVENT_RCU(rcu_barrier,
810
811 TP_PROTO(const char *rcuname, const char *s, int cpu, int cnt, unsigned long done),
812
813 TP_ARGS(rcuname, s, cpu, cnt, done),
814
815 TP_STRUCT__entry(
816 __field(const char *, rcuname)
817 __field(const char *, s)
818 __field(int, cpu)
819 __field(int, cnt)
820 __field(unsigned long, done)
821 ),
822
823 TP_fast_assign(
824 __entry->rcuname = rcuname;
825 __entry->s = s;
826 __entry->cpu = cpu;
827 __entry->cnt = cnt;
828 __entry->done = done;
829 ),
830
831 TP_printk("%s %s cpu %d remaining %d # %lu",
832 __entry->rcuname, __entry->s, __entry->cpu, __entry->cnt,
833 __entry->done)
834);
835
836#endif /* _TRACE_RCU_H */
837
838/* This part must be outside protection */
839#include <trace/define_trace.h>
1/* SPDX-License-Identifier: GPL-2.0 */
2#undef TRACE_SYSTEM
3#define TRACE_SYSTEM rcu
4
5#if !defined(_TRACE_RCU_H) || defined(TRACE_HEADER_MULTI_READ)
6#define _TRACE_RCU_H
7
8#include <linux/tracepoint.h>
9
10/*
11 * Tracepoint for start/end markers used for utilization calculations.
12 * By convention, the string is of the following forms:
13 *
14 * "Start <activity>" -- Mark the start of the specified activity,
15 * such as "context switch". Nesting is permitted.
16 * "End <activity>" -- Mark the end of the specified activity.
17 *
18 * An "@" character within "<activity>" is a comment character: Data
19 * reduction scripts will ignore the "@" and the remainder of the line.
20 */
21TRACE_EVENT(rcu_utilization,
22
23 TP_PROTO(const char *s),
24
25 TP_ARGS(s),
26
27 TP_STRUCT__entry(
28 __field(const char *, s)
29 ),
30
31 TP_fast_assign(
32 __entry->s = s;
33 ),
34
35 TP_printk("%s", __entry->s)
36);
37
38#ifdef CONFIG_RCU_TRACE
39
40#if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
41
42/*
43 * Tracepoint for grace-period events. Takes a string identifying the
44 * RCU flavor, the grace-period number, and a string identifying the
45 * grace-period-related event as follows:
46 *
47 * "AccReadyCB": CPU acclerates new callbacks to RCU_NEXT_READY_TAIL.
48 * "AccWaitCB": CPU accelerates new callbacks to RCU_WAIT_TAIL.
49 * "newreq": Request a new grace period.
50 * "start": Start a grace period.
51 * "cpustart": CPU first notices a grace-period start.
52 * "cpuqs": CPU passes through a quiescent state.
53 * "cpuonl": CPU comes online.
54 * "cpuofl": CPU goes offline.
55 * "reqwait": GP kthread sleeps waiting for grace-period request.
56 * "reqwaitsig": GP kthread awakened by signal from reqwait state.
57 * "fqswait": GP kthread waiting until time to force quiescent states.
58 * "fqsstart": GP kthread starts forcing quiescent states.
59 * "fqsend": GP kthread done forcing quiescent states.
60 * "fqswaitsig": GP kthread awakened by signal from fqswait state.
61 * "end": End a grace period.
62 * "cpuend": CPU first notices a grace-period end.
63 */
64TRACE_EVENT(rcu_grace_period,
65
66 TP_PROTO(const char *rcuname, unsigned long gpnum, const char *gpevent),
67
68 TP_ARGS(rcuname, gpnum, gpevent),
69
70 TP_STRUCT__entry(
71 __field(const char *, rcuname)
72 __field(unsigned long, gpnum)
73 __field(const char *, gpevent)
74 ),
75
76 TP_fast_assign(
77 __entry->rcuname = rcuname;
78 __entry->gpnum = gpnum;
79 __entry->gpevent = gpevent;
80 ),
81
82 TP_printk("%s %lu %s",
83 __entry->rcuname, __entry->gpnum, __entry->gpevent)
84);
85
86/*
87 * Tracepoint for future grace-period events, including those for no-callbacks
88 * CPUs. The caller should pull the data from the rcu_node structure,
89 * other than rcuname, which comes from the rcu_state structure, and event,
90 * which is one of the following:
91 *
92 * "Startleaf": Request a nocb grace period based on leaf-node data.
93 * "Startedleaf": Leaf-node start proved sufficient.
94 * "Startedleafroot": Leaf-node start proved sufficient after checking root.
95 * "Startedroot": Requested a nocb grace period based on root-node data.
96 * "StartWait": Start waiting for the requested grace period.
97 * "ResumeWait": Resume waiting after signal.
98 * "EndWait": Complete wait.
99 * "Cleanup": Clean up rcu_node structure after previous GP.
100 * "CleanupMore": Clean up, and another no-CB GP is needed.
101 */
102TRACE_EVENT(rcu_future_grace_period,
103
104 TP_PROTO(const char *rcuname, unsigned long gpnum, unsigned long completed,
105 unsigned long c, u8 level, int grplo, int grphi,
106 const char *gpevent),
107
108 TP_ARGS(rcuname, gpnum, completed, c, level, grplo, grphi, gpevent),
109
110 TP_STRUCT__entry(
111 __field(const char *, rcuname)
112 __field(unsigned long, gpnum)
113 __field(unsigned long, completed)
114 __field(unsigned long, c)
115 __field(u8, level)
116 __field(int, grplo)
117 __field(int, grphi)
118 __field(const char *, gpevent)
119 ),
120
121 TP_fast_assign(
122 __entry->rcuname = rcuname;
123 __entry->gpnum = gpnum;
124 __entry->completed = completed;
125 __entry->c = c;
126 __entry->level = level;
127 __entry->grplo = grplo;
128 __entry->grphi = grphi;
129 __entry->gpevent = gpevent;
130 ),
131
132 TP_printk("%s %lu %lu %lu %u %d %d %s",
133 __entry->rcuname, __entry->gpnum, __entry->completed,
134 __entry->c, __entry->level, __entry->grplo, __entry->grphi,
135 __entry->gpevent)
136);
137
138/*
139 * Tracepoint for grace-period-initialization events. These are
140 * distinguished by the type of RCU, the new grace-period number, the
141 * rcu_node structure level, the starting and ending CPU covered by the
142 * rcu_node structure, and the mask of CPUs that will be waited for.
143 * All but the type of RCU are extracted from the rcu_node structure.
144 */
145TRACE_EVENT(rcu_grace_period_init,
146
147 TP_PROTO(const char *rcuname, unsigned long gpnum, u8 level,
148 int grplo, int grphi, unsigned long qsmask),
149
150 TP_ARGS(rcuname, gpnum, level, grplo, grphi, qsmask),
151
152 TP_STRUCT__entry(
153 __field(const char *, rcuname)
154 __field(unsigned long, gpnum)
155 __field(u8, level)
156 __field(int, grplo)
157 __field(int, grphi)
158 __field(unsigned long, qsmask)
159 ),
160
161 TP_fast_assign(
162 __entry->rcuname = rcuname;
163 __entry->gpnum = gpnum;
164 __entry->level = level;
165 __entry->grplo = grplo;
166 __entry->grphi = grphi;
167 __entry->qsmask = qsmask;
168 ),
169
170 TP_printk("%s %lu %u %d %d %lx",
171 __entry->rcuname, __entry->gpnum, __entry->level,
172 __entry->grplo, __entry->grphi, __entry->qsmask)
173);
174
175/*
176 * Tracepoint for expedited grace-period events. Takes a string identifying
177 * the RCU flavor, the expedited grace-period sequence number, and a string
178 * identifying the grace-period-related event as follows:
179 *
180 * "snap": Captured snapshot of expedited grace period sequence number.
181 * "start": Started a real expedited grace period.
182 * "reset": Started resetting the tree
183 * "select": Started selecting the CPUs to wait on.
184 * "selectofl": Selected CPU partially offline.
185 * "startwait": Started waiting on selected CPUs.
186 * "end": Ended a real expedited grace period.
187 * "endwake": Woke piggybackers up.
188 * "done": Someone else did the expedited grace period for us.
189 */
190TRACE_EVENT(rcu_exp_grace_period,
191
192 TP_PROTO(const char *rcuname, unsigned long gpseq, const char *gpevent),
193
194 TP_ARGS(rcuname, gpseq, gpevent),
195
196 TP_STRUCT__entry(
197 __field(const char *, rcuname)
198 __field(unsigned long, gpseq)
199 __field(const char *, gpevent)
200 ),
201
202 TP_fast_assign(
203 __entry->rcuname = rcuname;
204 __entry->gpseq = gpseq;
205 __entry->gpevent = gpevent;
206 ),
207
208 TP_printk("%s %lu %s",
209 __entry->rcuname, __entry->gpseq, __entry->gpevent)
210);
211
212/*
213 * Tracepoint for expedited grace-period funnel-locking events. Takes a
214 * string identifying the RCU flavor, an integer identifying the rcu_node
215 * combining-tree level, another pair of integers identifying the lowest-
216 * and highest-numbered CPU associated with the current rcu_node structure,
217 * and a string. identifying the grace-period-related event as follows:
218 *
219 * "nxtlvl": Advance to next level of rcu_node funnel
220 * "wait": Wait for someone else to do expedited GP
221 */
222TRACE_EVENT(rcu_exp_funnel_lock,
223
224 TP_PROTO(const char *rcuname, u8 level, int grplo, int grphi,
225 const char *gpevent),
226
227 TP_ARGS(rcuname, level, grplo, grphi, gpevent),
228
229 TP_STRUCT__entry(
230 __field(const char *, rcuname)
231 __field(u8, level)
232 __field(int, grplo)
233 __field(int, grphi)
234 __field(const char *, gpevent)
235 ),
236
237 TP_fast_assign(
238 __entry->rcuname = rcuname;
239 __entry->level = level;
240 __entry->grplo = grplo;
241 __entry->grphi = grphi;
242 __entry->gpevent = gpevent;
243 ),
244
245 TP_printk("%s %d %d %d %s",
246 __entry->rcuname, __entry->level, __entry->grplo,
247 __entry->grphi, __entry->gpevent)
248);
249
250#ifdef CONFIG_RCU_NOCB_CPU
251/*
252 * Tracepoint for RCU no-CBs CPU callback handoffs. This event is intended
253 * to assist debugging of these handoffs.
254 *
255 * The first argument is the name of the RCU flavor, and the second is
256 * the number of the offloaded CPU are extracted. The third and final
257 * argument is a string as follows:
258 *
259 * "WakeEmpty": Wake rcuo kthread, first CB to empty list.
260 * "WakeEmptyIsDeferred": Wake rcuo kthread later, first CB to empty list.
261 * "WakeOvf": Wake rcuo kthread, CB list is huge.
262 * "WakeOvfIsDeferred": Wake rcuo kthread later, CB list is huge.
263 * "WakeNot": Don't wake rcuo kthread.
264 * "WakeNotPoll": Don't wake rcuo kthread because it is polling.
265 * "DeferredWake": Carried out the "IsDeferred" wakeup.
266 * "Poll": Start of new polling cycle for rcu_nocb_poll.
267 * "Sleep": Sleep waiting for CBs for !rcu_nocb_poll.
268 * "WokeEmpty": rcuo kthread woke to find empty list.
269 * "WokeNonEmpty": rcuo kthread woke to find non-empty list.
270 * "WaitQueue": Enqueue partially done, timed wait for it to complete.
271 * "WokeQueue": Partial enqueue now complete.
272 */
273TRACE_EVENT(rcu_nocb_wake,
274
275 TP_PROTO(const char *rcuname, int cpu, const char *reason),
276
277 TP_ARGS(rcuname, cpu, reason),
278
279 TP_STRUCT__entry(
280 __field(const char *, rcuname)
281 __field(int, cpu)
282 __field(const char *, reason)
283 ),
284
285 TP_fast_assign(
286 __entry->rcuname = rcuname;
287 __entry->cpu = cpu;
288 __entry->reason = reason;
289 ),
290
291 TP_printk("%s %d %s", __entry->rcuname, __entry->cpu, __entry->reason)
292);
293#endif
294
295/*
296 * Tracepoint for tasks blocking within preemptible-RCU read-side
297 * critical sections. Track the type of RCU (which one day might
298 * include SRCU), the grace-period number that the task is blocking
299 * (the current or the next), and the task's PID.
300 */
301TRACE_EVENT(rcu_preempt_task,
302
303 TP_PROTO(const char *rcuname, int pid, unsigned long gpnum),
304
305 TP_ARGS(rcuname, pid, gpnum),
306
307 TP_STRUCT__entry(
308 __field(const char *, rcuname)
309 __field(unsigned long, gpnum)
310 __field(int, pid)
311 ),
312
313 TP_fast_assign(
314 __entry->rcuname = rcuname;
315 __entry->gpnum = gpnum;
316 __entry->pid = pid;
317 ),
318
319 TP_printk("%s %lu %d",
320 __entry->rcuname, __entry->gpnum, __entry->pid)
321);
322
323/*
324 * Tracepoint for tasks that blocked within a given preemptible-RCU
325 * read-side critical section exiting that critical section. Track the
326 * type of RCU (which one day might include SRCU) and the task's PID.
327 */
328TRACE_EVENT(rcu_unlock_preempted_task,
329
330 TP_PROTO(const char *rcuname, unsigned long gpnum, int pid),
331
332 TP_ARGS(rcuname, gpnum, pid),
333
334 TP_STRUCT__entry(
335 __field(const char *, rcuname)
336 __field(unsigned long, gpnum)
337 __field(int, pid)
338 ),
339
340 TP_fast_assign(
341 __entry->rcuname = rcuname;
342 __entry->gpnum = gpnum;
343 __entry->pid = pid;
344 ),
345
346 TP_printk("%s %lu %d", __entry->rcuname, __entry->gpnum, __entry->pid)
347);
348
349/*
350 * Tracepoint for quiescent-state-reporting events. These are
351 * distinguished by the type of RCU, the grace-period number, the
352 * mask of quiescent lower-level entities, the rcu_node structure level,
353 * the starting and ending CPU covered by the rcu_node structure, and
354 * whether there are any blocked tasks blocking the current grace period.
355 * All but the type of RCU are extracted from the rcu_node structure.
356 */
357TRACE_EVENT(rcu_quiescent_state_report,
358
359 TP_PROTO(const char *rcuname, unsigned long gpnum,
360 unsigned long mask, unsigned long qsmask,
361 u8 level, int grplo, int grphi, int gp_tasks),
362
363 TP_ARGS(rcuname, gpnum, mask, qsmask, level, grplo, grphi, gp_tasks),
364
365 TP_STRUCT__entry(
366 __field(const char *, rcuname)
367 __field(unsigned long, gpnum)
368 __field(unsigned long, mask)
369 __field(unsigned long, qsmask)
370 __field(u8, level)
371 __field(int, grplo)
372 __field(int, grphi)
373 __field(u8, gp_tasks)
374 ),
375
376 TP_fast_assign(
377 __entry->rcuname = rcuname;
378 __entry->gpnum = gpnum;
379 __entry->mask = mask;
380 __entry->qsmask = qsmask;
381 __entry->level = level;
382 __entry->grplo = grplo;
383 __entry->grphi = grphi;
384 __entry->gp_tasks = gp_tasks;
385 ),
386
387 TP_printk("%s %lu %lx>%lx %u %d %d %u",
388 __entry->rcuname, __entry->gpnum,
389 __entry->mask, __entry->qsmask, __entry->level,
390 __entry->grplo, __entry->grphi, __entry->gp_tasks)
391);
392
393/*
394 * Tracepoint for quiescent states detected by force_quiescent_state().
395 * These trace events include the type of RCU, the grace-period number that
396 * was blocked by the CPU, the CPU itself, and the type of quiescent state,
397 * which can be "dti" for dyntick-idle mode, "ofl" for CPU offline, "kick"
398 * when kicking a CPU that has been in dyntick-idle mode for too long, or
399 * "rqc" if the CPU got a quiescent state via its rcu_qs_ctr.
400 */
401TRACE_EVENT(rcu_fqs,
402
403 TP_PROTO(const char *rcuname, unsigned long gpnum, int cpu, const char *qsevent),
404
405 TP_ARGS(rcuname, gpnum, cpu, qsevent),
406
407 TP_STRUCT__entry(
408 __field(const char *, rcuname)
409 __field(unsigned long, gpnum)
410 __field(int, cpu)
411 __field(const char *, qsevent)
412 ),
413
414 TP_fast_assign(
415 __entry->rcuname = rcuname;
416 __entry->gpnum = gpnum;
417 __entry->cpu = cpu;
418 __entry->qsevent = qsevent;
419 ),
420
421 TP_printk("%s %lu %d %s",
422 __entry->rcuname, __entry->gpnum,
423 __entry->cpu, __entry->qsevent)
424);
425
426#endif /* #if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU) */
427
428/*
429 * Tracepoint for dyntick-idle entry/exit events. These take a string
430 * as argument: "Start" for entering dyntick-idle mode, "Startirq" for
431 * entering it from irq/NMI, "End" for leaving it, "Endirq" for leaving it
432 * to irq/NMI, "--=" for events moving towards idle, and "++=" for events
433 * moving away from idle.
434 *
435 * These events also take a pair of numbers, which indicate the nesting
436 * depth before and after the event of interest, and a third number that is
437 * the ->dynticks counter. Note that task-related and interrupt-related
438 * events use two separate counters, and that the "++=" and "--=" events
439 * for irq/NMI will change the counter by two, otherwise by one.
440 */
441TRACE_EVENT(rcu_dyntick,
442
443 TP_PROTO(const char *polarity, long oldnesting, long newnesting, atomic_t dynticks),
444
445 TP_ARGS(polarity, oldnesting, newnesting, dynticks),
446
447 TP_STRUCT__entry(
448 __field(const char *, polarity)
449 __field(long, oldnesting)
450 __field(long, newnesting)
451 __field(int, dynticks)
452 ),
453
454 TP_fast_assign(
455 __entry->polarity = polarity;
456 __entry->oldnesting = oldnesting;
457 __entry->newnesting = newnesting;
458 __entry->dynticks = atomic_read(&dynticks);
459 ),
460
461 TP_printk("%s %lx %lx %#3x", __entry->polarity,
462 __entry->oldnesting, __entry->newnesting,
463 __entry->dynticks & 0xfff)
464);
465
466/*
467 * Tracepoint for the registration of a single RCU callback function.
468 * The first argument is the type of RCU, the second argument is
469 * a pointer to the RCU callback itself, the third element is the
470 * number of lazy callbacks queued, and the fourth element is the
471 * total number of callbacks queued.
472 */
473TRACE_EVENT(rcu_callback,
474
475 TP_PROTO(const char *rcuname, struct rcu_head *rhp, long qlen_lazy,
476 long qlen),
477
478 TP_ARGS(rcuname, rhp, qlen_lazy, qlen),
479
480 TP_STRUCT__entry(
481 __field(const char *, rcuname)
482 __field(void *, rhp)
483 __field(void *, func)
484 __field(long, qlen_lazy)
485 __field(long, qlen)
486 ),
487
488 TP_fast_assign(
489 __entry->rcuname = rcuname;
490 __entry->rhp = rhp;
491 __entry->func = rhp->func;
492 __entry->qlen_lazy = qlen_lazy;
493 __entry->qlen = qlen;
494 ),
495
496 TP_printk("%s rhp=%p func=%pf %ld/%ld",
497 __entry->rcuname, __entry->rhp, __entry->func,
498 __entry->qlen_lazy, __entry->qlen)
499);
500
501/*
502 * Tracepoint for the registration of a single RCU callback of the special
503 * kfree() form. The first argument is the RCU type, the second argument
504 * is a pointer to the RCU callback, the third argument is the offset
505 * of the callback within the enclosing RCU-protected data structure,
506 * the fourth argument is the number of lazy callbacks queued, and the
507 * fifth argument is the total number of callbacks queued.
508 */
509TRACE_EVENT(rcu_kfree_callback,
510
511 TP_PROTO(const char *rcuname, struct rcu_head *rhp, unsigned long offset,
512 long qlen_lazy, long qlen),
513
514 TP_ARGS(rcuname, rhp, offset, qlen_lazy, qlen),
515
516 TP_STRUCT__entry(
517 __field(const char *, rcuname)
518 __field(void *, rhp)
519 __field(unsigned long, offset)
520 __field(long, qlen_lazy)
521 __field(long, qlen)
522 ),
523
524 TP_fast_assign(
525 __entry->rcuname = rcuname;
526 __entry->rhp = rhp;
527 __entry->offset = offset;
528 __entry->qlen_lazy = qlen_lazy;
529 __entry->qlen = qlen;
530 ),
531
532 TP_printk("%s rhp=%p func=%ld %ld/%ld",
533 __entry->rcuname, __entry->rhp, __entry->offset,
534 __entry->qlen_lazy, __entry->qlen)
535);
536
537/*
538 * Tracepoint for marking the beginning rcu_do_batch, performed to start
539 * RCU callback invocation. The first argument is the RCU flavor,
540 * the second is the number of lazy callbacks queued, the third is
541 * the total number of callbacks queued, and the fourth argument is
542 * the current RCU-callback batch limit.
543 */
544TRACE_EVENT(rcu_batch_start,
545
546 TP_PROTO(const char *rcuname, long qlen_lazy, long qlen, long blimit),
547
548 TP_ARGS(rcuname, qlen_lazy, qlen, blimit),
549
550 TP_STRUCT__entry(
551 __field(const char *, rcuname)
552 __field(long, qlen_lazy)
553 __field(long, qlen)
554 __field(long, blimit)
555 ),
556
557 TP_fast_assign(
558 __entry->rcuname = rcuname;
559 __entry->qlen_lazy = qlen_lazy;
560 __entry->qlen = qlen;
561 __entry->blimit = blimit;
562 ),
563
564 TP_printk("%s CBs=%ld/%ld bl=%ld",
565 __entry->rcuname, __entry->qlen_lazy, __entry->qlen,
566 __entry->blimit)
567);
568
569/*
570 * Tracepoint for the invocation of a single RCU callback function.
571 * The first argument is the type of RCU, and the second argument is
572 * a pointer to the RCU callback itself.
573 */
574TRACE_EVENT(rcu_invoke_callback,
575
576 TP_PROTO(const char *rcuname, struct rcu_head *rhp),
577
578 TP_ARGS(rcuname, rhp),
579
580 TP_STRUCT__entry(
581 __field(const char *, rcuname)
582 __field(void *, rhp)
583 __field(void *, func)
584 ),
585
586 TP_fast_assign(
587 __entry->rcuname = rcuname;
588 __entry->rhp = rhp;
589 __entry->func = rhp->func;
590 ),
591
592 TP_printk("%s rhp=%p func=%pf",
593 __entry->rcuname, __entry->rhp, __entry->func)
594);
595
596/*
597 * Tracepoint for the invocation of a single RCU callback of the special
598 * kfree() form. The first argument is the RCU flavor, the second
599 * argument is a pointer to the RCU callback, and the third argument
600 * is the offset of the callback within the enclosing RCU-protected
601 * data structure.
602 */
603TRACE_EVENT(rcu_invoke_kfree_callback,
604
605 TP_PROTO(const char *rcuname, struct rcu_head *rhp, unsigned long offset),
606
607 TP_ARGS(rcuname, rhp, offset),
608
609 TP_STRUCT__entry(
610 __field(const char *, rcuname)
611 __field(void *, rhp)
612 __field(unsigned long, offset)
613 ),
614
615 TP_fast_assign(
616 __entry->rcuname = rcuname;
617 __entry->rhp = rhp;
618 __entry->offset = offset;
619 ),
620
621 TP_printk("%s rhp=%p func=%ld",
622 __entry->rcuname, __entry->rhp, __entry->offset)
623);
624
625/*
626 * Tracepoint for exiting rcu_do_batch after RCU callbacks have been
627 * invoked. The first argument is the name of the RCU flavor,
628 * the second argument is number of callbacks actually invoked,
629 * the third argument (cb) is whether or not any of the callbacks that
630 * were ready to invoke at the beginning of this batch are still
631 * queued, the fourth argument (nr) is the return value of need_resched(),
632 * the fifth argument (iit) is 1 if the current task is the idle task,
633 * and the sixth argument (risk) is the return value from
634 * rcu_is_callbacks_kthread().
635 */
636TRACE_EVENT(rcu_batch_end,
637
638 TP_PROTO(const char *rcuname, int callbacks_invoked,
639 char cb, char nr, char iit, char risk),
640
641 TP_ARGS(rcuname, callbacks_invoked, cb, nr, iit, risk),
642
643 TP_STRUCT__entry(
644 __field(const char *, rcuname)
645 __field(int, callbacks_invoked)
646 __field(char, cb)
647 __field(char, nr)
648 __field(char, iit)
649 __field(char, risk)
650 ),
651
652 TP_fast_assign(
653 __entry->rcuname = rcuname;
654 __entry->callbacks_invoked = callbacks_invoked;
655 __entry->cb = cb;
656 __entry->nr = nr;
657 __entry->iit = iit;
658 __entry->risk = risk;
659 ),
660
661 TP_printk("%s CBs-invoked=%d idle=%c%c%c%c",
662 __entry->rcuname, __entry->callbacks_invoked,
663 __entry->cb ? 'C' : '.',
664 __entry->nr ? 'S' : '.',
665 __entry->iit ? 'I' : '.',
666 __entry->risk ? 'R' : '.')
667);
668
669/*
670 * Tracepoint for rcutorture readers. The first argument is the name
671 * of the RCU flavor from rcutorture's viewpoint and the second argument
672 * is the callback address. The third argument is the start time in
673 * seconds, and the last two arguments are the grace period numbers
674 * at the beginning and end of the read, respectively. Note that the
675 * callback address can be NULL.
676 */
677#define RCUTORTURENAME_LEN 8
678TRACE_EVENT(rcu_torture_read,
679
680 TP_PROTO(const char *rcutorturename, struct rcu_head *rhp,
681 unsigned long secs, unsigned long c_old, unsigned long c),
682
683 TP_ARGS(rcutorturename, rhp, secs, c_old, c),
684
685 TP_STRUCT__entry(
686 __field(char, rcutorturename[RCUTORTURENAME_LEN])
687 __field(struct rcu_head *, rhp)
688 __field(unsigned long, secs)
689 __field(unsigned long, c_old)
690 __field(unsigned long, c)
691 ),
692
693 TP_fast_assign(
694 strncpy(__entry->rcutorturename, rcutorturename,
695 RCUTORTURENAME_LEN);
696 __entry->rcutorturename[RCUTORTURENAME_LEN - 1] = 0;
697 __entry->rhp = rhp;
698 __entry->secs = secs;
699 __entry->c_old = c_old;
700 __entry->c = c;
701 ),
702
703 TP_printk("%s torture read %p %luus c: %lu %lu",
704 __entry->rcutorturename, __entry->rhp,
705 __entry->secs, __entry->c_old, __entry->c)
706);
707
708/*
709 * Tracepoint for _rcu_barrier() execution. The string "s" describes
710 * the _rcu_barrier phase:
711 * "Begin": _rcu_barrier() started.
712 * "EarlyExit": _rcu_barrier() piggybacked, thus early exit.
713 * "Inc1": _rcu_barrier() piggyback check counter incremented.
714 * "OfflineNoCB": _rcu_barrier() found callback on never-online CPU
715 * "OnlineNoCB": _rcu_barrier() found online no-CBs CPU.
716 * "OnlineQ": _rcu_barrier() found online CPU with callbacks.
717 * "OnlineNQ": _rcu_barrier() found online CPU, no callbacks.
718 * "IRQ": An rcu_barrier_callback() callback posted on remote CPU.
719 * "IRQNQ": An rcu_barrier_callback() callback found no callbacks.
720 * "CB": An rcu_barrier_callback() invoked a callback, not the last.
721 * "LastCB": An rcu_barrier_callback() invoked the last callback.
722 * "Inc2": _rcu_barrier() piggyback check counter incremented.
723 * The "cpu" argument is the CPU or -1 if meaningless, the "cnt" argument
724 * is the count of remaining callbacks, and "done" is the piggybacking count.
725 */
726TRACE_EVENT(rcu_barrier,
727
728 TP_PROTO(const char *rcuname, const char *s, int cpu, int cnt, unsigned long done),
729
730 TP_ARGS(rcuname, s, cpu, cnt, done),
731
732 TP_STRUCT__entry(
733 __field(const char *, rcuname)
734 __field(const char *, s)
735 __field(int, cpu)
736 __field(int, cnt)
737 __field(unsigned long, done)
738 ),
739
740 TP_fast_assign(
741 __entry->rcuname = rcuname;
742 __entry->s = s;
743 __entry->cpu = cpu;
744 __entry->cnt = cnt;
745 __entry->done = done;
746 ),
747
748 TP_printk("%s %s cpu %d remaining %d # %lu",
749 __entry->rcuname, __entry->s, __entry->cpu, __entry->cnt,
750 __entry->done)
751);
752
753#else /* #ifdef CONFIG_RCU_TRACE */
754
755#define trace_rcu_grace_period(rcuname, gpnum, gpevent) do { } while (0)
756#define trace_rcu_future_grace_period(rcuname, gpnum, completed, c, \
757 level, grplo, grphi, event) \
758 do { } while (0)
759#define trace_rcu_grace_period_init(rcuname, gpnum, level, grplo, grphi, \
760 qsmask) do { } while (0)
761#define trace_rcu_exp_grace_period(rcuname, gqseq, gpevent) \
762 do { } while (0)
763#define trace_rcu_exp_funnel_lock(rcuname, level, grplo, grphi, gpevent) \
764 do { } while (0)
765#define trace_rcu_nocb_wake(rcuname, cpu, reason) do { } while (0)
766#define trace_rcu_preempt_task(rcuname, pid, gpnum) do { } while (0)
767#define trace_rcu_unlock_preempted_task(rcuname, gpnum, pid) do { } while (0)
768#define trace_rcu_quiescent_state_report(rcuname, gpnum, mask, qsmask, level, \
769 grplo, grphi, gp_tasks) do { } \
770 while (0)
771#define trace_rcu_fqs(rcuname, gpnum, cpu, qsevent) do { } while (0)
772#define trace_rcu_dyntick(polarity, oldnesting, newnesting, dyntick) do { } while (0)
773#define trace_rcu_callback(rcuname, rhp, qlen_lazy, qlen) do { } while (0)
774#define trace_rcu_kfree_callback(rcuname, rhp, offset, qlen_lazy, qlen) \
775 do { } while (0)
776#define trace_rcu_batch_start(rcuname, qlen_lazy, qlen, blimit) \
777 do { } while (0)
778#define trace_rcu_invoke_callback(rcuname, rhp) do { } while (0)
779#define trace_rcu_invoke_kfree_callback(rcuname, rhp, offset) do { } while (0)
780#define trace_rcu_batch_end(rcuname, callbacks_invoked, cb, nr, iit, risk) \
781 do { } while (0)
782#define trace_rcu_torture_read(rcutorturename, rhp, secs, c_old, c) \
783 do { } while (0)
784#define trace_rcu_barrier(name, s, cpu, cnt, done) do { } while (0)
785
786#endif /* #else #ifdef CONFIG_RCU_TRACE */
787
788#endif /* _TRACE_RCU_H */
789
790/* This part must be outside protection */
791#include <trace/define_trace.h>