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 */
27 TRACE_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 */
69 TRACE_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 */
107 TRACE_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 */
147 TRACE_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 */
192 TRACE_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 */
224 TRACE_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 */
284 TRACE_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 */
312 TRACE_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 */
339 TRACE_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 */
368 TRACE_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 */
411 TRACE_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 */
444 TRACE_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 */
480 TRACE_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 */
512 TRACE_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
537 TRACE_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 */
571 TRACE_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 */
604 TRACE_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 */
631 TRACE_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 */
660 TRACE_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 */
688 TRACE_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 a normal synchronize_rcu() states. The first argument
712 * is the RCU flavor, the second argument is a pointer to rcu_head the
713 * last one is an event.
714 */
715 TRACE_EVENT_RCU(rcu_sr_normal,
716
717 TP_PROTO(const char *rcuname, struct rcu_head *rhp, const char *srevent),
718
719 TP_ARGS(rcuname, rhp, srevent),
720
721 TP_STRUCT__entry(
722 __field(const char *, rcuname)
723 __field(void *, rhp)
724 __field(const char *, srevent)
725 ),
726
727 TP_fast_assign(
728 __entry->rcuname = rcuname;
729 __entry->rhp = rhp;
730 __entry->srevent = srevent;
731 ),
732
733 TP_printk("%s rhp=0x%p event=%s",
734 __entry->rcuname, __entry->rhp, __entry->srevent)
735 );
736
737 /*
738 * Tracepoint for exiting rcu_do_batch after RCU callbacks have been
739 * invoked. The first argument is the name of the RCU flavor,
740 * the second argument is number of callbacks actually invoked,
741 * the third argument (cb) is whether or not any of the callbacks that
742 * were ready to invoke at the beginning of this batch are still
743 * queued, the fourth argument (nr) is the return value of need_resched(),
744 * the fifth argument (iit) is 1 if the current task is the idle task,
745 * and the sixth argument (risk) is the return value from
746 * rcu_is_callbacks_kthread().
747 */
748 TRACE_EVENT_RCU(rcu_batch_end,
749
750 TP_PROTO(const char *rcuname, int callbacks_invoked,
751 char cb, char nr, char iit, char risk),
752
753 TP_ARGS(rcuname, callbacks_invoked, cb, nr, iit, risk),
754
755 TP_STRUCT__entry(
756 __field(const char *, rcuname)
757 __field(int, callbacks_invoked)
758 __field(char, cb)
759 __field(char, nr)
760 __field(char, iit)
761 __field(char, risk)
762 ),
763
764 TP_fast_assign(
765 __entry->rcuname = rcuname;
766 __entry->callbacks_invoked = callbacks_invoked;
767 __entry->cb = cb;
768 __entry->nr = nr;
769 __entry->iit = iit;
770 __entry->risk = risk;
771 ),
772
773 TP_printk("%s CBs-invoked=%d idle=%c%c%c%c",
774 __entry->rcuname, __entry->callbacks_invoked,
775 __entry->cb ? 'C' : '.',
776 __entry->nr ? 'S' : '.',
777 __entry->iit ? 'I' : '.',
778 __entry->risk ? 'R' : '.')
779 );
780
781 /*
782 * Tracepoint for rcutorture readers. The first argument is the name
783 * of the RCU flavor from rcutorture's viewpoint and the second argument
784 * is the callback address. The third argument is the start time in
785 * seconds, and the last two arguments are the grace period numbers
786 * at the beginning and end of the read, respectively. Note that the
787 * callback address can be NULL.
788 */
789 #define RCUTORTURENAME_LEN 8
790 TRACE_EVENT_RCU(rcu_torture_read,
791
792 TP_PROTO(const char *rcutorturename, struct rcu_head *rhp,
793 unsigned long secs, unsigned long c_old, unsigned long c),
794
795 TP_ARGS(rcutorturename, rhp, secs, c_old, c),
796
797 TP_STRUCT__entry(
798 __array(char, rcutorturename, RCUTORTURENAME_LEN)
799 __field(struct rcu_head *, rhp)
800 __field(unsigned long, secs)
801 __field(unsigned long, c_old)
802 __field(unsigned long, c)
803 ),
804
805 TP_fast_assign(
806 strscpy(__entry->rcutorturename, rcutorturename, RCUTORTURENAME_LEN);
807 __entry->rhp = rhp;
808 __entry->secs = secs;
809 __entry->c_old = c_old;
810 __entry->c = c;
811 ),
812
813 TP_printk("%s torture read %p %luus c: %lu %lu",
814 __entry->rcutorturename, __entry->rhp,
815 __entry->secs, __entry->c_old, __entry->c)
816 );
817
818 /*
819 * Tracepoint for rcu_barrier() execution. The string "s" describes
820 * the rcu_barrier phase:
821 * "Begin": rcu_barrier() started.
822 * "CB": An rcu_barrier_callback() invoked a callback, not the last.
823 * "EarlyExit": rcu_barrier() piggybacked, thus early exit.
824 * "Inc1": rcu_barrier() piggyback check counter incremented.
825 * "Inc2": rcu_barrier() piggyback check counter incremented.
826 * "IRQ": An rcu_barrier_callback() callback posted on remote CPU.
827 * "IRQNQ": An rcu_barrier_callback() callback found no callbacks.
828 * "LastCB": An rcu_barrier_callback() invoked the last callback.
829 * "NQ": rcu_barrier() found a CPU with no callbacks.
830 * "OnlineQ": rcu_barrier() found online CPU with callbacks.
831 * The "cpu" argument is the CPU or -1 if meaningless, the "cnt" argument
832 * is the count of remaining callbacks, and "done" is the piggybacking count.
833 */
834 TRACE_EVENT_RCU(rcu_barrier,
835
836 TP_PROTO(const char *rcuname, const char *s, int cpu, int cnt, unsigned long done),
837
838 TP_ARGS(rcuname, s, cpu, cnt, done),
839
840 TP_STRUCT__entry(
841 __field(const char *, rcuname)
842 __field(const char *, s)
843 __field(int, cpu)
844 __field(int, cnt)
845 __field(unsigned long, done)
846 ),
847
848 TP_fast_assign(
849 __entry->rcuname = rcuname;
850 __entry->s = s;
851 __entry->cpu = cpu;
852 __entry->cnt = cnt;
853 __entry->done = done;
854 ),
855
856 TP_printk("%s %s cpu %d remaining %d # %lu",
857 __entry->rcuname, __entry->s, __entry->cpu, __entry->cnt,
858 __entry->done)
859 );
860
861 #endif /* _TRACE_RCU_H */
862
863 /* This part must be outside protection */
864 #include <trace/define_trace.h>
865
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