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1#undef TRACE_SYSTEM
2#define TRACE_SYSTEM rcu
3
4#if !defined(_TRACE_RCU_H) || defined(TRACE_HEADER_MULTI_READ)
5#define _TRACE_RCU_H
6
7#include <linux/tracepoint.h>
8
9/*
10 * Tracepoint for start/end markers used for utilization calculations.
11 * By convention, the string is of the following forms:
12 *
13 * "Start <activity>" -- Mark the start of the specified activity,
14 * such as "context switch". Nesting is permitted.
15 * "End <activity>" -- Mark the end of the specified activity.
16 *
17 * An "@" character within "<activity>" is a comment character: Data
18 * reduction scripts will ignore the "@" and the remainder of the line.
19 */
20TRACE_EVENT(rcu_utilization,
21
22 TP_PROTO(const char *s),
23
24 TP_ARGS(s),
25
26 TP_STRUCT__entry(
27 __field(const char *, s)
28 ),
29
30 TP_fast_assign(
31 __entry->s = s;
32 ),
33
34 TP_printk("%s", __entry->s)
35);
36
37#ifdef CONFIG_RCU_TRACE
38
39#if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
40
41/*
42 * Tracepoint for grace-period events. Takes a string identifying the
43 * RCU flavor, the grace-period number, and a string identifying the
44 * grace-period-related event as follows:
45 *
46 * "AccReadyCB": CPU acclerates new callbacks to RCU_NEXT_READY_TAIL.
47 * "AccWaitCB": CPU accelerates new callbacks to RCU_WAIT_TAIL.
48 * "newreq": Request a new grace period.
49 * "start": Start a grace period.
50 * "cpustart": CPU first notices a grace-period start.
51 * "cpuqs": CPU passes through a quiescent state.
52 * "cpuonl": CPU comes online.
53 * "cpuofl": CPU goes offline.
54 * "reqwait": GP kthread sleeps waiting for grace-period request.
55 * "reqwaitsig": GP kthread awakened by signal from reqwait state.
56 * "fqswait": GP kthread waiting until time to force quiescent states.
57 * "fqsstart": GP kthread starts forcing quiescent states.
58 * "fqsend": GP kthread done forcing quiescent states.
59 * "fqswaitsig": GP kthread awakened by signal from fqswait state.
60 * "end": End a grace period.
61 * "cpuend": CPU first notices a grace-period end.
62 */
63TRACE_EVENT(rcu_grace_period,
64
65 TP_PROTO(const char *rcuname, unsigned long gpnum, const char *gpevent),
66
67 TP_ARGS(rcuname, gpnum, gpevent),
68
69 TP_STRUCT__entry(
70 __field(const char *, rcuname)
71 __field(unsigned long, gpnum)
72 __field(const char *, gpevent)
73 ),
74
75 TP_fast_assign(
76 __entry->rcuname = rcuname;
77 __entry->gpnum = gpnum;
78 __entry->gpevent = gpevent;
79 ),
80
81 TP_printk("%s %lu %s",
82 __entry->rcuname, __entry->gpnum, __entry->gpevent)
83);
84
85/*
86 * Tracepoint for future grace-period events, including those for no-callbacks
87 * CPUs. The caller should pull the data from the rcu_node structure,
88 * other than rcuname, which comes from the rcu_state structure, and event,
89 * which is one of the following:
90 *
91 * "Startleaf": Request a nocb grace period based on leaf-node data.
92 * "Startedleaf": Leaf-node start proved sufficient.
93 * "Startedleafroot": Leaf-node start proved sufficient after checking root.
94 * "Startedroot": Requested a nocb grace period based on root-node data.
95 * "StartWait": Start waiting for the requested grace period.
96 * "ResumeWait": Resume waiting after signal.
97 * "EndWait": Complete wait.
98 * "Cleanup": Clean up rcu_node structure after previous GP.
99 * "CleanupMore": Clean up, and another no-CB GP is needed.
100 */
101TRACE_EVENT(rcu_future_grace_period,
102
103 TP_PROTO(const char *rcuname, unsigned long gpnum, unsigned long completed,
104 unsigned long c, u8 level, int grplo, int grphi,
105 const char *gpevent),
106
107 TP_ARGS(rcuname, gpnum, completed, c, level, grplo, grphi, gpevent),
108
109 TP_STRUCT__entry(
110 __field(const char *, rcuname)
111 __field(unsigned long, gpnum)
112 __field(unsigned long, completed)
113 __field(unsigned long, c)
114 __field(u8, level)
115 __field(int, grplo)
116 __field(int, grphi)
117 __field(const char *, gpevent)
118 ),
119
120 TP_fast_assign(
121 __entry->rcuname = rcuname;
122 __entry->gpnum = gpnum;
123 __entry->completed = completed;
124 __entry->c = c;
125 __entry->level = level;
126 __entry->grplo = grplo;
127 __entry->grphi = grphi;
128 __entry->gpevent = gpevent;
129 ),
130
131 TP_printk("%s %lu %lu %lu %u %d %d %s",
132 __entry->rcuname, __entry->gpnum, __entry->completed,
133 __entry->c, __entry->level, __entry->grplo, __entry->grphi,
134 __entry->gpevent)
135);
136
137/*
138 * Tracepoint for grace-period-initialization events. These are
139 * distinguished by the type of RCU, the new grace-period number, the
140 * rcu_node structure level, the starting and ending CPU covered by the
141 * rcu_node structure, and the mask of CPUs that will be waited for.
142 * All but the type of RCU are extracted from the rcu_node structure.
143 */
144TRACE_EVENT(rcu_grace_period_init,
145
146 TP_PROTO(const char *rcuname, unsigned long gpnum, u8 level,
147 int grplo, int grphi, unsigned long qsmask),
148
149 TP_ARGS(rcuname, gpnum, level, grplo, grphi, qsmask),
150
151 TP_STRUCT__entry(
152 __field(const char *, rcuname)
153 __field(unsigned long, gpnum)
154 __field(u8, level)
155 __field(int, grplo)
156 __field(int, grphi)
157 __field(unsigned long, qsmask)
158 ),
159
160 TP_fast_assign(
161 __entry->rcuname = rcuname;
162 __entry->gpnum = gpnum;
163 __entry->level = level;
164 __entry->grplo = grplo;
165 __entry->grphi = grphi;
166 __entry->qsmask = qsmask;
167 ),
168
169 TP_printk("%s %lu %u %d %d %lx",
170 __entry->rcuname, __entry->gpnum, __entry->level,
171 __entry->grplo, __entry->grphi, __entry->qsmask)
172);
173
174/*
175 * Tracepoint for RCU no-CBs CPU callback handoffs. This event is intended
176 * to assist debugging of these handoffs.
177 *
178 * The first argument is the name of the RCU flavor, and the second is
179 * the number of the offloaded CPU are extracted. The third and final
180 * argument is a string as follows:
181 *
182 * "WakeEmpty": Wake rcuo kthread, first CB to empty list.
183 * "WakeEmptyIsDeferred": Wake rcuo kthread later, first CB to empty list.
184 * "WakeOvf": Wake rcuo kthread, CB list is huge.
185 * "WakeOvfIsDeferred": Wake rcuo kthread later, CB list is huge.
186 * "WakeNot": Don't wake rcuo kthread.
187 * "WakeNotPoll": Don't wake rcuo kthread because it is polling.
188 * "DeferredWake": Carried out the "IsDeferred" wakeup.
189 * "Poll": Start of new polling cycle for rcu_nocb_poll.
190 * "Sleep": Sleep waiting for CBs for !rcu_nocb_poll.
191 * "WokeEmpty": rcuo kthread woke to find empty list.
192 * "WokeNonEmpty": rcuo kthread woke to find non-empty list.
193 * "WaitQueue": Enqueue partially done, timed wait for it to complete.
194 * "WokeQueue": Partial enqueue now complete.
195 */
196TRACE_EVENT(rcu_nocb_wake,
197
198 TP_PROTO(const char *rcuname, int cpu, const char *reason),
199
200 TP_ARGS(rcuname, cpu, reason),
201
202 TP_STRUCT__entry(
203 __field(const char *, rcuname)
204 __field(int, cpu)
205 __field(const char *, reason)
206 ),
207
208 TP_fast_assign(
209 __entry->rcuname = rcuname;
210 __entry->cpu = cpu;
211 __entry->reason = reason;
212 ),
213
214 TP_printk("%s %d %s", __entry->rcuname, __entry->cpu, __entry->reason)
215);
216
217/*
218 * Tracepoint for tasks blocking within preemptible-RCU read-side
219 * critical sections. Track the type of RCU (which one day might
220 * include SRCU), the grace-period number that the task is blocking
221 * (the current or the next), and the task's PID.
222 */
223TRACE_EVENT(rcu_preempt_task,
224
225 TP_PROTO(const char *rcuname, int pid, unsigned long gpnum),
226
227 TP_ARGS(rcuname, pid, gpnum),
228
229 TP_STRUCT__entry(
230 __field(const char *, rcuname)
231 __field(unsigned long, gpnum)
232 __field(int, pid)
233 ),
234
235 TP_fast_assign(
236 __entry->rcuname = rcuname;
237 __entry->gpnum = gpnum;
238 __entry->pid = pid;
239 ),
240
241 TP_printk("%s %lu %d",
242 __entry->rcuname, __entry->gpnum, __entry->pid)
243);
244
245/*
246 * Tracepoint for tasks that blocked within a given preemptible-RCU
247 * read-side critical section exiting that critical section. Track the
248 * type of RCU (which one day might include SRCU) and the task's PID.
249 */
250TRACE_EVENT(rcu_unlock_preempted_task,
251
252 TP_PROTO(const char *rcuname, unsigned long gpnum, int pid),
253
254 TP_ARGS(rcuname, gpnum, pid),
255
256 TP_STRUCT__entry(
257 __field(const char *, rcuname)
258 __field(unsigned long, gpnum)
259 __field(int, pid)
260 ),
261
262 TP_fast_assign(
263 __entry->rcuname = rcuname;
264 __entry->gpnum = gpnum;
265 __entry->pid = pid;
266 ),
267
268 TP_printk("%s %lu %d", __entry->rcuname, __entry->gpnum, __entry->pid)
269);
270
271/*
272 * Tracepoint for quiescent-state-reporting events. These are
273 * distinguished by the type of RCU, the grace-period number, the
274 * mask of quiescent lower-level entities, the rcu_node structure level,
275 * the starting and ending CPU covered by the rcu_node structure, and
276 * whether there are any blocked tasks blocking the current grace period.
277 * All but the type of RCU are extracted from the rcu_node structure.
278 */
279TRACE_EVENT(rcu_quiescent_state_report,
280
281 TP_PROTO(const char *rcuname, unsigned long gpnum,
282 unsigned long mask, unsigned long qsmask,
283 u8 level, int grplo, int grphi, int gp_tasks),
284
285 TP_ARGS(rcuname, gpnum, mask, qsmask, level, grplo, grphi, gp_tasks),
286
287 TP_STRUCT__entry(
288 __field(const char *, rcuname)
289 __field(unsigned long, gpnum)
290 __field(unsigned long, mask)
291 __field(unsigned long, qsmask)
292 __field(u8, level)
293 __field(int, grplo)
294 __field(int, grphi)
295 __field(u8, gp_tasks)
296 ),
297
298 TP_fast_assign(
299 __entry->rcuname = rcuname;
300 __entry->gpnum = gpnum;
301 __entry->mask = mask;
302 __entry->qsmask = qsmask;
303 __entry->level = level;
304 __entry->grplo = grplo;
305 __entry->grphi = grphi;
306 __entry->gp_tasks = gp_tasks;
307 ),
308
309 TP_printk("%s %lu %lx>%lx %u %d %d %u",
310 __entry->rcuname, __entry->gpnum,
311 __entry->mask, __entry->qsmask, __entry->level,
312 __entry->grplo, __entry->grphi, __entry->gp_tasks)
313);
314
315/*
316 * Tracepoint for quiescent states detected by force_quiescent_state().
317 * These trace events include the type of RCU, the grace-period number
318 * that was blocked by the CPU, the CPU itself, and the type of quiescent
319 * state, which can be "dti" for dyntick-idle mode, "ofl" for CPU offline,
320 * or "kick" when kicking a CPU that has been in dyntick-idle mode for
321 * too long.
322 */
323TRACE_EVENT(rcu_fqs,
324
325 TP_PROTO(const char *rcuname, unsigned long gpnum, int cpu, const char *qsevent),
326
327 TP_ARGS(rcuname, gpnum, cpu, qsevent),
328
329 TP_STRUCT__entry(
330 __field(const char *, rcuname)
331 __field(unsigned long, gpnum)
332 __field(int, cpu)
333 __field(const char *, qsevent)
334 ),
335
336 TP_fast_assign(
337 __entry->rcuname = rcuname;
338 __entry->gpnum = gpnum;
339 __entry->cpu = cpu;
340 __entry->qsevent = qsevent;
341 ),
342
343 TP_printk("%s %lu %d %s",
344 __entry->rcuname, __entry->gpnum,
345 __entry->cpu, __entry->qsevent)
346);
347
348#endif /* #if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU) */
349
350/*
351 * Tracepoint for dyntick-idle entry/exit events. These take a string
352 * as argument: "Start" for entering dyntick-idle mode, "End" for
353 * leaving it, "--=" for events moving towards idle, and "++=" for events
354 * moving away from idle. "Error on entry: not idle task" and "Error on
355 * exit: not idle task" indicate that a non-idle task is erroneously
356 * toying with the idle loop.
357 *
358 * These events also take a pair of numbers, which indicate the nesting
359 * depth before and after the event of interest. Note that task-related
360 * events use the upper bits of each number, while interrupt-related
361 * events use the lower bits.
362 */
363TRACE_EVENT(rcu_dyntick,
364
365 TP_PROTO(const char *polarity, long long oldnesting, long long newnesting),
366
367 TP_ARGS(polarity, oldnesting, newnesting),
368
369 TP_STRUCT__entry(
370 __field(const char *, polarity)
371 __field(long long, oldnesting)
372 __field(long long, newnesting)
373 ),
374
375 TP_fast_assign(
376 __entry->polarity = polarity;
377 __entry->oldnesting = oldnesting;
378 __entry->newnesting = newnesting;
379 ),
380
381 TP_printk("%s %llx %llx", __entry->polarity,
382 __entry->oldnesting, __entry->newnesting)
383);
384
385/*
386 * Tracepoint for RCU preparation for idle, the goal being to get RCU
387 * processing done so that the current CPU can shut off its scheduling
388 * clock and enter dyntick-idle mode. One way to accomplish this is
389 * to drain all RCU callbacks from this CPU, and the other is to have
390 * done everything RCU requires for the current grace period. In this
391 * latter case, the CPU will be awakened at the end of the current grace
392 * period in order to process the remainder of its callbacks.
393 *
394 * These tracepoints take a string as argument:
395 *
396 * "No callbacks": Nothing to do, no callbacks on this CPU.
397 * "In holdoff": Nothing to do, holding off after unsuccessful attempt.
398 * "Begin holdoff": Attempt failed, don't retry until next jiffy.
399 * "Dyntick with callbacks": Entering dyntick-idle despite callbacks.
400 * "Dyntick with lazy callbacks": Entering dyntick-idle w/lazy callbacks.
401 * "More callbacks": Still more callbacks, try again to clear them out.
402 * "Callbacks drained": All callbacks processed, off to dyntick idle!
403 * "Timer": Timer fired to cause CPU to continue processing callbacks.
404 * "Demigrate": Timer fired on wrong CPU, woke up correct CPU.
405 * "Cleanup after idle": Idle exited, timer canceled.
406 */
407TRACE_EVENT(rcu_prep_idle,
408
409 TP_PROTO(const char *reason),
410
411 TP_ARGS(reason),
412
413 TP_STRUCT__entry(
414 __field(const char *, reason)
415 ),
416
417 TP_fast_assign(
418 __entry->reason = reason;
419 ),
420
421 TP_printk("%s", __entry->reason)
422);
423
424/*
425 * Tracepoint for the registration of a single RCU callback function.
426 * The first argument is the type of RCU, the second argument is
427 * a pointer to the RCU callback itself, the third element is the
428 * number of lazy callbacks queued, and the fourth element is the
429 * total number of callbacks queued.
430 */
431TRACE_EVENT(rcu_callback,
432
433 TP_PROTO(const char *rcuname, struct rcu_head *rhp, long qlen_lazy,
434 long qlen),
435
436 TP_ARGS(rcuname, rhp, qlen_lazy, qlen),
437
438 TP_STRUCT__entry(
439 __field(const char *, rcuname)
440 __field(void *, rhp)
441 __field(void *, func)
442 __field(long, qlen_lazy)
443 __field(long, qlen)
444 ),
445
446 TP_fast_assign(
447 __entry->rcuname = rcuname;
448 __entry->rhp = rhp;
449 __entry->func = rhp->func;
450 __entry->qlen_lazy = qlen_lazy;
451 __entry->qlen = qlen;
452 ),
453
454 TP_printk("%s rhp=%p func=%pf %ld/%ld",
455 __entry->rcuname, __entry->rhp, __entry->func,
456 __entry->qlen_lazy, __entry->qlen)
457);
458
459/*
460 * Tracepoint for the registration of a single RCU callback of the special
461 * kfree() form. The first argument is the RCU type, the second argument
462 * is a pointer to the RCU callback, the third argument is the offset
463 * of the callback within the enclosing RCU-protected data structure,
464 * the fourth argument is the number of lazy callbacks queued, and the
465 * fifth argument is the total number of callbacks queued.
466 */
467TRACE_EVENT(rcu_kfree_callback,
468
469 TP_PROTO(const char *rcuname, struct rcu_head *rhp, unsigned long offset,
470 long qlen_lazy, long qlen),
471
472 TP_ARGS(rcuname, rhp, offset, qlen_lazy, qlen),
473
474 TP_STRUCT__entry(
475 __field(const char *, rcuname)
476 __field(void *, rhp)
477 __field(unsigned long, offset)
478 __field(long, qlen_lazy)
479 __field(long, qlen)
480 ),
481
482 TP_fast_assign(
483 __entry->rcuname = rcuname;
484 __entry->rhp = rhp;
485 __entry->offset = offset;
486 __entry->qlen_lazy = qlen_lazy;
487 __entry->qlen = qlen;
488 ),
489
490 TP_printk("%s rhp=%p func=%ld %ld/%ld",
491 __entry->rcuname, __entry->rhp, __entry->offset,
492 __entry->qlen_lazy, __entry->qlen)
493);
494
495/*
496 * Tracepoint for marking the beginning rcu_do_batch, performed to start
497 * RCU callback invocation. The first argument is the RCU flavor,
498 * the second is the number of lazy callbacks queued, the third is
499 * the total number of callbacks queued, and the fourth argument is
500 * the current RCU-callback batch limit.
501 */
502TRACE_EVENT(rcu_batch_start,
503
504 TP_PROTO(const char *rcuname, long qlen_lazy, long qlen, long blimit),
505
506 TP_ARGS(rcuname, qlen_lazy, qlen, blimit),
507
508 TP_STRUCT__entry(
509 __field(const char *, rcuname)
510 __field(long, qlen_lazy)
511 __field(long, qlen)
512 __field(long, blimit)
513 ),
514
515 TP_fast_assign(
516 __entry->rcuname = rcuname;
517 __entry->qlen_lazy = qlen_lazy;
518 __entry->qlen = qlen;
519 __entry->blimit = blimit;
520 ),
521
522 TP_printk("%s CBs=%ld/%ld bl=%ld",
523 __entry->rcuname, __entry->qlen_lazy, __entry->qlen,
524 __entry->blimit)
525);
526
527/*
528 * Tracepoint for the invocation of a single RCU callback function.
529 * The first argument is the type of RCU, and the second argument is
530 * a pointer to the RCU callback itself.
531 */
532TRACE_EVENT(rcu_invoke_callback,
533
534 TP_PROTO(const char *rcuname, struct rcu_head *rhp),
535
536 TP_ARGS(rcuname, rhp),
537
538 TP_STRUCT__entry(
539 __field(const char *, rcuname)
540 __field(void *, rhp)
541 __field(void *, func)
542 ),
543
544 TP_fast_assign(
545 __entry->rcuname = rcuname;
546 __entry->rhp = rhp;
547 __entry->func = rhp->func;
548 ),
549
550 TP_printk("%s rhp=%p func=%pf",
551 __entry->rcuname, __entry->rhp, __entry->func)
552);
553
554/*
555 * Tracepoint for the invocation of a single RCU callback of the special
556 * kfree() form. The first argument is the RCU flavor, the second
557 * argument is a pointer to the RCU callback, and the third argument
558 * is the offset of the callback within the enclosing RCU-protected
559 * data structure.
560 */
561TRACE_EVENT(rcu_invoke_kfree_callback,
562
563 TP_PROTO(const char *rcuname, struct rcu_head *rhp, unsigned long offset),
564
565 TP_ARGS(rcuname, rhp, offset),
566
567 TP_STRUCT__entry(
568 __field(const char *, rcuname)
569 __field(void *, rhp)
570 __field(unsigned long, offset)
571 ),
572
573 TP_fast_assign(
574 __entry->rcuname = rcuname;
575 __entry->rhp = rhp;
576 __entry->offset = offset;
577 ),
578
579 TP_printk("%s rhp=%p func=%ld",
580 __entry->rcuname, __entry->rhp, __entry->offset)
581);
582
583/*
584 * Tracepoint for exiting rcu_do_batch after RCU callbacks have been
585 * invoked. The first argument is the name of the RCU flavor,
586 * the second argument is number of callbacks actually invoked,
587 * the third argument (cb) is whether or not any of the callbacks that
588 * were ready to invoke at the beginning of this batch are still
589 * queued, the fourth argument (nr) is the return value of need_resched(),
590 * the fifth argument (iit) is 1 if the current task is the idle task,
591 * and the sixth argument (risk) is the return value from
592 * rcu_is_callbacks_kthread().
593 */
594TRACE_EVENT(rcu_batch_end,
595
596 TP_PROTO(const char *rcuname, int callbacks_invoked,
597 char cb, char nr, char iit, char risk),
598
599 TP_ARGS(rcuname, callbacks_invoked, cb, nr, iit, risk),
600
601 TP_STRUCT__entry(
602 __field(const char *, rcuname)
603 __field(int, callbacks_invoked)
604 __field(char, cb)
605 __field(char, nr)
606 __field(char, iit)
607 __field(char, risk)
608 ),
609
610 TP_fast_assign(
611 __entry->rcuname = rcuname;
612 __entry->callbacks_invoked = callbacks_invoked;
613 __entry->cb = cb;
614 __entry->nr = nr;
615 __entry->iit = iit;
616 __entry->risk = risk;
617 ),
618
619 TP_printk("%s CBs-invoked=%d idle=%c%c%c%c",
620 __entry->rcuname, __entry->callbacks_invoked,
621 __entry->cb ? 'C' : '.',
622 __entry->nr ? 'S' : '.',
623 __entry->iit ? 'I' : '.',
624 __entry->risk ? 'R' : '.')
625);
626
627/*
628 * Tracepoint for rcutorture readers. The first argument is the name
629 * of the RCU flavor from rcutorture's viewpoint and the second argument
630 * is the callback address.
631 */
632TRACE_EVENT(rcu_torture_read,
633
634 TP_PROTO(const char *rcutorturename, struct rcu_head *rhp,
635 unsigned long secs, unsigned long c_old, unsigned long c),
636
637 TP_ARGS(rcutorturename, rhp, secs, c_old, c),
638
639 TP_STRUCT__entry(
640 __field(const char *, rcutorturename)
641 __field(struct rcu_head *, rhp)
642 __field(unsigned long, secs)
643 __field(unsigned long, c_old)
644 __field(unsigned long, c)
645 ),
646
647 TP_fast_assign(
648 __entry->rcutorturename = rcutorturename;
649 __entry->rhp = rhp;
650 __entry->secs = secs;
651 __entry->c_old = c_old;
652 __entry->c = c;
653 ),
654
655 TP_printk("%s torture read %p %luus c: %lu %lu",
656 __entry->rcutorturename, __entry->rhp,
657 __entry->secs, __entry->c_old, __entry->c)
658);
659
660/*
661 * Tracepoint for _rcu_barrier() execution. The string "s" describes
662 * the _rcu_barrier phase:
663 * "Begin": _rcu_barrier() started.
664 * "EarlyExit": _rcu_barrier() piggybacked, thus early exit.
665 * "Inc1": _rcu_barrier() piggyback check counter incremented.
666 * "OfflineNoCB": _rcu_barrier() found callback on never-online CPU
667 * "OnlineNoCB": _rcu_barrier() found online no-CBs CPU.
668 * "OnlineQ": _rcu_barrier() found online CPU with callbacks.
669 * "OnlineNQ": _rcu_barrier() found online CPU, no callbacks.
670 * "IRQ": An rcu_barrier_callback() callback posted on remote CPU.
671 * "CB": An rcu_barrier_callback() invoked a callback, not the last.
672 * "LastCB": An rcu_barrier_callback() invoked the last callback.
673 * "Inc2": _rcu_barrier() piggyback check counter incremented.
674 * The "cpu" argument is the CPU or -1 if meaningless, the "cnt" argument
675 * is the count of remaining callbacks, and "done" is the piggybacking count.
676 */
677TRACE_EVENT(rcu_barrier,
678
679 TP_PROTO(const char *rcuname, const char *s, int cpu, int cnt, unsigned long done),
680
681 TP_ARGS(rcuname, s, cpu, cnt, done),
682
683 TP_STRUCT__entry(
684 __field(const char *, rcuname)
685 __field(const char *, s)
686 __field(int, cpu)
687 __field(int, cnt)
688 __field(unsigned long, done)
689 ),
690
691 TP_fast_assign(
692 __entry->rcuname = rcuname;
693 __entry->s = s;
694 __entry->cpu = cpu;
695 __entry->cnt = cnt;
696 __entry->done = done;
697 ),
698
699 TP_printk("%s %s cpu %d remaining %d # %lu",
700 __entry->rcuname, __entry->s, __entry->cpu, __entry->cnt,
701 __entry->done)
702);
703
704#else /* #ifdef CONFIG_RCU_TRACE */
705
706#define trace_rcu_grace_period(rcuname, gpnum, gpevent) do { } while (0)
707#define trace_rcu_grace_period_init(rcuname, gpnum, level, grplo, grphi, \
708 qsmask) do { } while (0)
709#define trace_rcu_future_grace_period(rcuname, gpnum, completed, c, \
710 level, grplo, grphi, event) \
711 do { } while (0)
712#define trace_rcu_nocb_wake(rcuname, cpu, reason) do { } while (0)
713#define trace_rcu_preempt_task(rcuname, pid, gpnum) do { } while (0)
714#define trace_rcu_unlock_preempted_task(rcuname, gpnum, pid) do { } while (0)
715#define trace_rcu_quiescent_state_report(rcuname, gpnum, mask, qsmask, level, \
716 grplo, grphi, gp_tasks) do { } \
717 while (0)
718#define trace_rcu_fqs(rcuname, gpnum, cpu, qsevent) do { } while (0)
719#define trace_rcu_dyntick(polarity, oldnesting, newnesting) do { } while (0)
720#define trace_rcu_prep_idle(reason) do { } while (0)
721#define trace_rcu_callback(rcuname, rhp, qlen_lazy, qlen) do { } while (0)
722#define trace_rcu_kfree_callback(rcuname, rhp, offset, qlen_lazy, qlen) \
723 do { } while (0)
724#define trace_rcu_batch_start(rcuname, qlen_lazy, qlen, blimit) \
725 do { } while (0)
726#define trace_rcu_invoke_callback(rcuname, rhp) do { } while (0)
727#define trace_rcu_invoke_kfree_callback(rcuname, rhp, offset) do { } while (0)
728#define trace_rcu_batch_end(rcuname, callbacks_invoked, cb, nr, iit, risk) \
729 do { } while (0)
730#define trace_rcu_torture_read(rcutorturename, rhp, secs, c_old, c) \
731 do { } while (0)
732#define trace_rcu_barrier(name, s, cpu, cnt, done) do { } while (0)
733
734#endif /* #else #ifdef CONFIG_RCU_TRACE */
735
736#endif /* _TRACE_RCU_H */
737
738/* This part must be outside protection */
739#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>