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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 acclerates 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(unsigned long, gp_seq)
78 __field(const char *, gpevent)
79 ),
80
81 TP_fast_assign(
82 __entry->rcuname = rcuname;
83 __entry->gp_seq = gp_seq;
84 __entry->gpevent = gpevent;
85 ),
86
87 TP_printk("%s %lu %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(unsigned long, gp_seq)
118 __field(unsigned 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 = gp_seq;
128 __entry->gp_seq_req = 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 %lu %lu %u %d %d %s",
136 __entry->rcuname, __entry->gp_seq, __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(unsigned 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 = gp_seq;
166 __entry->level = level;
167 __entry->grplo = grplo;
168 __entry->grphi = grphi;
169 __entry->qsmask = qsmask;
170 ),
171
172 TP_printk("%s %lu %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(unsigned long, gpseq)
201 __field(const char *, gpevent)
202 ),
203
204 TP_fast_assign(
205 __entry->rcuname = rcuname;
206 __entry->gpseq = gpseq;
207 __entry->gpevent = gpevent;
208 ),
209
210 TP_printk("%s %lu %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 * "WokeEmpty": rcuo CB kthread woke to find empty list.
282 */
283TRACE_EVENT_RCU(rcu_nocb_wake,
284
285 TP_PROTO(const char *rcuname, int cpu, const char *reason),
286
287 TP_ARGS(rcuname, cpu, reason),
288
289 TP_STRUCT__entry(
290 __field(const char *, rcuname)
291 __field(int, cpu)
292 __field(const char *, reason)
293 ),
294
295 TP_fast_assign(
296 __entry->rcuname = rcuname;
297 __entry->cpu = cpu;
298 __entry->reason = reason;
299 ),
300
301 TP_printk("%s %d %s", __entry->rcuname, __entry->cpu, __entry->reason)
302);
303#endif
304
305/*
306 * Tracepoint for tasks blocking within preemptible-RCU read-side
307 * critical sections. Track the type of RCU (which one day might
308 * include SRCU), the grace-period number that the task is blocking
309 * (the current or the next), and the task's PID.
310 */
311TRACE_EVENT_RCU(rcu_preempt_task,
312
313 TP_PROTO(const char *rcuname, int pid, unsigned long gp_seq),
314
315 TP_ARGS(rcuname, pid, gp_seq),
316
317 TP_STRUCT__entry(
318 __field(const char *, rcuname)
319 __field(unsigned long, gp_seq)
320 __field(int, pid)
321 ),
322
323 TP_fast_assign(
324 __entry->rcuname = rcuname;
325 __entry->gp_seq = gp_seq;
326 __entry->pid = pid;
327 ),
328
329 TP_printk("%s %lu %d",
330 __entry->rcuname, __entry->gp_seq, __entry->pid)
331);
332
333/*
334 * Tracepoint for tasks that blocked within a given preemptible-RCU
335 * read-side critical section exiting that critical section. Track the
336 * type of RCU (which one day might include SRCU) and the task's PID.
337 */
338TRACE_EVENT_RCU(rcu_unlock_preempted_task,
339
340 TP_PROTO(const char *rcuname, unsigned long gp_seq, int pid),
341
342 TP_ARGS(rcuname, gp_seq, pid),
343
344 TP_STRUCT__entry(
345 __field(const char *, rcuname)
346 __field(unsigned long, gp_seq)
347 __field(int, pid)
348 ),
349
350 TP_fast_assign(
351 __entry->rcuname = rcuname;
352 __entry->gp_seq = gp_seq;
353 __entry->pid = pid;
354 ),
355
356 TP_printk("%s %lu %d", __entry->rcuname, __entry->gp_seq, __entry->pid)
357);
358
359/*
360 * Tracepoint for quiescent-state-reporting events. These are
361 * distinguished by the type of RCU, the grace-period number, the
362 * mask of quiescent lower-level entities, the rcu_node structure level,
363 * the starting and ending CPU covered by the rcu_node structure, and
364 * whether there are any blocked tasks blocking the current grace period.
365 * All but the type of RCU are extracted from the rcu_node structure.
366 */
367TRACE_EVENT_RCU(rcu_quiescent_state_report,
368
369 TP_PROTO(const char *rcuname, unsigned long gp_seq,
370 unsigned long mask, unsigned long qsmask,
371 u8 level, int grplo, int grphi, int gp_tasks),
372
373 TP_ARGS(rcuname, gp_seq, mask, qsmask, level, grplo, grphi, gp_tasks),
374
375 TP_STRUCT__entry(
376 __field(const char *, rcuname)
377 __field(unsigned long, gp_seq)
378 __field(unsigned long, mask)
379 __field(unsigned long, qsmask)
380 __field(u8, level)
381 __field(int, grplo)
382 __field(int, grphi)
383 __field(u8, gp_tasks)
384 ),
385
386 TP_fast_assign(
387 __entry->rcuname = rcuname;
388 __entry->gp_seq = gp_seq;
389 __entry->mask = mask;
390 __entry->qsmask = qsmask;
391 __entry->level = level;
392 __entry->grplo = grplo;
393 __entry->grphi = grphi;
394 __entry->gp_tasks = gp_tasks;
395 ),
396
397 TP_printk("%s %lu %lx>%lx %u %d %d %u",
398 __entry->rcuname, __entry->gp_seq,
399 __entry->mask, __entry->qsmask, __entry->level,
400 __entry->grplo, __entry->grphi, __entry->gp_tasks)
401);
402
403/*
404 * Tracepoint for quiescent states detected by force_quiescent_state().
405 * These trace events include the type of RCU, the grace-period number
406 * that was blocked by the CPU, the CPU itself, and the type of quiescent
407 * state, which can be "dti" for dyntick-idle mode or "kick" when kicking
408 * a CPU that has been in dyntick-idle mode for too long.
409 */
410TRACE_EVENT_RCU(rcu_fqs,
411
412 TP_PROTO(const char *rcuname, unsigned long gp_seq, int cpu, const char *qsevent),
413
414 TP_ARGS(rcuname, gp_seq, cpu, qsevent),
415
416 TP_STRUCT__entry(
417 __field(const char *, rcuname)
418 __field(unsigned long, gp_seq)
419 __field(int, cpu)
420 __field(const char *, qsevent)
421 ),
422
423 TP_fast_assign(
424 __entry->rcuname = rcuname;
425 __entry->gp_seq = gp_seq;
426 __entry->cpu = cpu;
427 __entry->qsevent = qsevent;
428 ),
429
430 TP_printk("%s %lu %d %s",
431 __entry->rcuname, __entry->gp_seq,
432 __entry->cpu, __entry->qsevent)
433);
434
435#endif /* #if defined(CONFIG_TREE_RCU) */
436
437/*
438 * Tracepoint for dyntick-idle entry/exit events. These take 2 strings
439 * as argument:
440 * polarity: "Start", "End", "StillNonIdle" for entering, exiting or still not
441 * being in dyntick-idle mode.
442 * context: "USER" or "IDLE" or "IRQ".
443 * NMIs nested in IRQs are inferred with dynticks_nesting > 1 in IRQ context.
444 *
445 * These events also take a pair of numbers, which indicate the nesting
446 * depth before and after the event of interest, and a third number that is
447 * the ->dynticks counter. Note that task-related and interrupt-related
448 * events use two separate counters, and that the "++=" and "--=" events
449 * for irq/NMI will change the counter by two, otherwise by one.
450 */
451TRACE_EVENT_RCU(rcu_dyntick,
452
453 TP_PROTO(const char *polarity, long oldnesting, long newnesting, int dynticks),
454
455 TP_ARGS(polarity, oldnesting, newnesting, dynticks),
456
457 TP_STRUCT__entry(
458 __field(const char *, polarity)
459 __field(long, oldnesting)
460 __field(long, newnesting)
461 __field(int, dynticks)
462 ),
463
464 TP_fast_assign(
465 __entry->polarity = polarity;
466 __entry->oldnesting = oldnesting;
467 __entry->newnesting = newnesting;
468 __entry->dynticks = dynticks;
469 ),
470
471 TP_printk("%s %lx %lx %#3x", __entry->polarity,
472 __entry->oldnesting, __entry->newnesting,
473 __entry->dynticks & 0xfff)
474);
475
476/*
477 * Tracepoint for the registration of a single RCU callback function.
478 * The first argument is the type of RCU, the second argument is
479 * a pointer to the RCU callback itself, the third element is the
480 * number of lazy callbacks queued, and the fourth element is the
481 * total number of callbacks queued.
482 */
483TRACE_EVENT_RCU(rcu_callback,
484
485 TP_PROTO(const char *rcuname, struct rcu_head *rhp, long qlen),
486
487 TP_ARGS(rcuname, rhp, qlen),
488
489 TP_STRUCT__entry(
490 __field(const char *, rcuname)
491 __field(void *, rhp)
492 __field(void *, func)
493 __field(long, qlen)
494 ),
495
496 TP_fast_assign(
497 __entry->rcuname = rcuname;
498 __entry->rhp = rhp;
499 __entry->func = rhp->func;
500 __entry->qlen = qlen;
501 ),
502
503 TP_printk("%s rhp=%p func=%ps %ld",
504 __entry->rcuname, __entry->rhp, __entry->func,
505 __entry->qlen)
506);
507
508/*
509 * Tracepoint for the registration of a single RCU callback of the special
510 * kvfree() form. The first argument is the RCU type, the second argument
511 * is a pointer to the RCU callback, the third argument is the offset
512 * of the callback within the enclosing RCU-protected data structure,
513 * the fourth argument is the number of lazy callbacks queued, and the
514 * fifth argument is the total number of callbacks queued.
515 */
516TRACE_EVENT_RCU(rcu_kvfree_callback,
517
518 TP_PROTO(const char *rcuname, struct rcu_head *rhp, unsigned long offset,
519 long qlen),
520
521 TP_ARGS(rcuname, rhp, offset, qlen),
522
523 TP_STRUCT__entry(
524 __field(const char *, rcuname)
525 __field(void *, rhp)
526 __field(unsigned long, offset)
527 __field(long, qlen)
528 ),
529
530 TP_fast_assign(
531 __entry->rcuname = rcuname;
532 __entry->rhp = rhp;
533 __entry->offset = offset;
534 __entry->qlen = qlen;
535 ),
536
537 TP_printk("%s rhp=%p func=%ld %ld",
538 __entry->rcuname, __entry->rhp, __entry->offset,
539 __entry->qlen)
540);
541
542/*
543 * Tracepoint for marking the beginning rcu_do_batch, performed to start
544 * RCU callback invocation. The first argument is the RCU flavor,
545 * the second is the number of lazy callbacks queued, the third is
546 * the total number of callbacks queued, and the fourth argument is
547 * the current RCU-callback batch limit.
548 */
549TRACE_EVENT_RCU(rcu_batch_start,
550
551 TP_PROTO(const char *rcuname, long qlen, long blimit),
552
553 TP_ARGS(rcuname, qlen, blimit),
554
555 TP_STRUCT__entry(
556 __field(const char *, rcuname)
557 __field(long, qlen)
558 __field(long, blimit)
559 ),
560
561 TP_fast_assign(
562 __entry->rcuname = rcuname;
563 __entry->qlen = qlen;
564 __entry->blimit = blimit;
565 ),
566
567 TP_printk("%s CBs=%ld bl=%ld",
568 __entry->rcuname, __entry->qlen, __entry->blimit)
569);
570
571/*
572 * Tracepoint for the invocation of a single RCU callback function.
573 * The first argument is the type of RCU, and the second argument is
574 * a pointer to the RCU callback itself.
575 */
576TRACE_EVENT_RCU(rcu_invoke_callback,
577
578 TP_PROTO(const char *rcuname, struct rcu_head *rhp),
579
580 TP_ARGS(rcuname, rhp),
581
582 TP_STRUCT__entry(
583 __field(const char *, rcuname)
584 __field(void *, rhp)
585 __field(void *, func)
586 ),
587
588 TP_fast_assign(
589 __entry->rcuname = rcuname;
590 __entry->rhp = rhp;
591 __entry->func = rhp->func;
592 ),
593
594 TP_printk("%s rhp=%p func=%ps",
595 __entry->rcuname, __entry->rhp, __entry->func)
596);
597
598/*
599 * Tracepoint for the invocation of a single RCU callback of the special
600 * kvfree() form. The first argument is the RCU flavor, the second
601 * argument is a pointer to the RCU callback, and the third argument
602 * is the offset of the callback within the enclosing RCU-protected
603 * data structure.
604 */
605TRACE_EVENT_RCU(rcu_invoke_kvfree_callback,
606
607 TP_PROTO(const char *rcuname, struct rcu_head *rhp, unsigned long offset),
608
609 TP_ARGS(rcuname, rhp, offset),
610
611 TP_STRUCT__entry(
612 __field(const char *, rcuname)
613 __field(void *, rhp)
614 __field(unsigned long, offset)
615 ),
616
617 TP_fast_assign(
618 __entry->rcuname = rcuname;
619 __entry->rhp = rhp;
620 __entry->offset = offset;
621 ),
622
623 TP_printk("%s rhp=%p func=%ld",
624 __entry->rcuname, __entry->rhp, __entry->offset)
625);
626
627/*
628 * Tracepoint for the invocation of a single RCU callback of the special
629 * kfree_bulk() form. The first argument is the RCU flavor, the second
630 * argument is a number of elements in array to free, the third is an
631 * address of the array holding nr_records entries.
632 */
633TRACE_EVENT_RCU(rcu_invoke_kfree_bulk_callback,
634
635 TP_PROTO(const char *rcuname, unsigned long nr_records, void **p),
636
637 TP_ARGS(rcuname, nr_records, p),
638
639 TP_STRUCT__entry(
640 __field(const char *, rcuname)
641 __field(unsigned long, nr_records)
642 __field(void **, p)
643 ),
644
645 TP_fast_assign(
646 __entry->rcuname = rcuname;
647 __entry->nr_records = nr_records;
648 __entry->p = p;
649 ),
650
651 TP_printk("%s bulk=0x%p nr_records=%lu",
652 __entry->rcuname, __entry->p, __entry->nr_records)
653);
654
655/*
656 * Tracepoint for exiting rcu_do_batch after RCU callbacks have been
657 * invoked. The first argument is the name of the RCU flavor,
658 * the second argument is number of callbacks actually invoked,
659 * the third argument (cb) is whether or not any of the callbacks that
660 * were ready to invoke at the beginning of this batch are still
661 * queued, the fourth argument (nr) is the return value of need_resched(),
662 * the fifth argument (iit) is 1 if the current task is the idle task,
663 * and the sixth argument (risk) is the return value from
664 * rcu_is_callbacks_kthread().
665 */
666TRACE_EVENT_RCU(rcu_batch_end,
667
668 TP_PROTO(const char *rcuname, int callbacks_invoked,
669 char cb, char nr, char iit, char risk),
670
671 TP_ARGS(rcuname, callbacks_invoked, cb, nr, iit, risk),
672
673 TP_STRUCT__entry(
674 __field(const char *, rcuname)
675 __field(int, callbacks_invoked)
676 __field(char, cb)
677 __field(char, nr)
678 __field(char, iit)
679 __field(char, risk)
680 ),
681
682 TP_fast_assign(
683 __entry->rcuname = rcuname;
684 __entry->callbacks_invoked = callbacks_invoked;
685 __entry->cb = cb;
686 __entry->nr = nr;
687 __entry->iit = iit;
688 __entry->risk = risk;
689 ),
690
691 TP_printk("%s CBs-invoked=%d idle=%c%c%c%c",
692 __entry->rcuname, __entry->callbacks_invoked,
693 __entry->cb ? 'C' : '.',
694 __entry->nr ? 'S' : '.',
695 __entry->iit ? 'I' : '.',
696 __entry->risk ? 'R' : '.')
697);
698
699/*
700 * Tracepoint for rcutorture readers. The first argument is the name
701 * of the RCU flavor from rcutorture's viewpoint and the second argument
702 * is the callback address. The third argument is the start time in
703 * seconds, and the last two arguments are the grace period numbers
704 * at the beginning and end of the read, respectively. Note that the
705 * callback address can be NULL.
706 */
707#define RCUTORTURENAME_LEN 8
708TRACE_EVENT_RCU(rcu_torture_read,
709
710 TP_PROTO(const char *rcutorturename, struct rcu_head *rhp,
711 unsigned long secs, unsigned long c_old, unsigned long c),
712
713 TP_ARGS(rcutorturename, rhp, secs, c_old, c),
714
715 TP_STRUCT__entry(
716 __field(char, rcutorturename[RCUTORTURENAME_LEN])
717 __field(struct rcu_head *, rhp)
718 __field(unsigned long, secs)
719 __field(unsigned long, c_old)
720 __field(unsigned long, c)
721 ),
722
723 TP_fast_assign(
724 strncpy(__entry->rcutorturename, rcutorturename,
725 RCUTORTURENAME_LEN);
726 __entry->rcutorturename[RCUTORTURENAME_LEN - 1] = 0;
727 __entry->rhp = rhp;
728 __entry->secs = secs;
729 __entry->c_old = c_old;
730 __entry->c = c;
731 ),
732
733 TP_printk("%s torture read %p %luus c: %lu %lu",
734 __entry->rcutorturename, __entry->rhp,
735 __entry->secs, __entry->c_old, __entry->c)
736);
737
738/*
739 * Tracepoint for rcu_barrier() execution. The string "s" describes
740 * the rcu_barrier phase:
741 * "Begin": rcu_barrier() started.
742 * "EarlyExit": rcu_barrier() piggybacked, thus early exit.
743 * "Inc1": rcu_barrier() piggyback check counter incremented.
744 * "OfflineNoCBQ": rcu_barrier() found offline no-CBs CPU with callbacks.
745 * "OnlineQ": rcu_barrier() found online CPU with callbacks.
746 * "OnlineNQ": rcu_barrier() found online CPU, no callbacks.
747 * "IRQ": An rcu_barrier_callback() callback posted on remote CPU.
748 * "IRQNQ": An rcu_barrier_callback() callback found no callbacks.
749 * "CB": An rcu_barrier_callback() invoked a callback, not the last.
750 * "LastCB": An rcu_barrier_callback() invoked the last callback.
751 * "Inc2": rcu_barrier() piggyback check counter incremented.
752 * The "cpu" argument is the CPU or -1 if meaningless, the "cnt" argument
753 * is the count of remaining callbacks, and "done" is the piggybacking count.
754 */
755TRACE_EVENT_RCU(rcu_barrier,
756
757 TP_PROTO(const char *rcuname, const char *s, int cpu, int cnt, unsigned long done),
758
759 TP_ARGS(rcuname, s, cpu, cnt, done),
760
761 TP_STRUCT__entry(
762 __field(const char *, rcuname)
763 __field(const char *, s)
764 __field(int, cpu)
765 __field(int, cnt)
766 __field(unsigned long, done)
767 ),
768
769 TP_fast_assign(
770 __entry->rcuname = rcuname;
771 __entry->s = s;
772 __entry->cpu = cpu;
773 __entry->cnt = cnt;
774 __entry->done = done;
775 ),
776
777 TP_printk("%s %s cpu %d remaining %d # %lu",
778 __entry->rcuname, __entry->s, __entry->cpu, __entry->cnt,
779 __entry->done)
780);
781
782#endif /* _TRACE_RCU_H */
783
784/* This part must be outside protection */
785#include <trace/define_trace.h>
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>