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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) || defined(CONFIG_PREEMPT_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 * "Startleaf": Request a grace period based on leaf-node data.
97 * "Prestarted": Someone beat us to the request
98 * "Startedleaf": Leaf node marked for future GP.
99 * "Startedleafroot": All nodes from leaf to root marked for future GP.
100 * "Startedroot": Requested a nocb grace period based on root-node data.
101 * "NoGPkthread": The RCU grace-period kthread has not yet started.
102 * "StartWait": Start waiting for the requested grace period.
103 * "EndWait": Complete wait.
104 * "Cleanup": Clean up rcu_node structure after previous GP.
105 * "CleanupMore": Clean up, and another GP is needed.
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 * "WakeEmpty": Wake rcuo kthread, first CB to empty list.
262 * "WakeEmptyIsDeferred": Wake rcuo kthread later, first CB to empty list.
263 * "WakeOvf": Wake rcuo kthread, CB list is huge.
264 * "WakeOvfIsDeferred": Wake rcuo kthread later, CB list is huge.
265 * "WakeNot": Don't wake rcuo kthread.
266 * "WakeNotPoll": Don't wake rcuo kthread because it is polling.
267 * "DeferredWake": Carried out the "IsDeferred" wakeup.
268 * "Poll": Start of new polling cycle for rcu_nocb_poll.
269 * "Sleep": Sleep waiting for GP for !rcu_nocb_poll.
270 * "CBSleep": Sleep waiting for CBs for !rcu_nocb_poll.
271 * "WokeEmpty": rcuo kthread woke to find empty list.
272 * "WokeNonEmpty": rcuo kthread woke to find non-empty list.
273 * "WaitQueue": Enqueue partially done, timed wait for it to complete.
274 * "WokeQueue": Partial enqueue now complete.
275 */
276TRACE_EVENT_RCU(rcu_nocb_wake,
277
278 TP_PROTO(const char *rcuname, int cpu, const char *reason),
279
280 TP_ARGS(rcuname, cpu, reason),
281
282 TP_STRUCT__entry(
283 __field(const char *, rcuname)
284 __field(int, cpu)
285 __field(const char *, reason)
286 ),
287
288 TP_fast_assign(
289 __entry->rcuname = rcuname;
290 __entry->cpu = cpu;
291 __entry->reason = reason;
292 ),
293
294 TP_printk("%s %d %s", __entry->rcuname, __entry->cpu, __entry->reason)
295);
296#endif
297
298/*
299 * Tracepoint for tasks blocking within preemptible-RCU read-side
300 * critical sections. Track the type of RCU (which one day might
301 * include SRCU), the grace-period number that the task is blocking
302 * (the current or the next), and the task's PID.
303 */
304TRACE_EVENT_RCU(rcu_preempt_task,
305
306 TP_PROTO(const char *rcuname, int pid, unsigned long gp_seq),
307
308 TP_ARGS(rcuname, pid, gp_seq),
309
310 TP_STRUCT__entry(
311 __field(const char *, rcuname)
312 __field(unsigned long, gp_seq)
313 __field(int, pid)
314 ),
315
316 TP_fast_assign(
317 __entry->rcuname = rcuname;
318 __entry->gp_seq = gp_seq;
319 __entry->pid = pid;
320 ),
321
322 TP_printk("%s %lu %d",
323 __entry->rcuname, __entry->gp_seq, __entry->pid)
324);
325
326/*
327 * Tracepoint for tasks that blocked within a given preemptible-RCU
328 * read-side critical section exiting that critical section. Track the
329 * type of RCU (which one day might include SRCU) and the task's PID.
330 */
331TRACE_EVENT_RCU(rcu_unlock_preempted_task,
332
333 TP_PROTO(const char *rcuname, unsigned long gp_seq, int pid),
334
335 TP_ARGS(rcuname, gp_seq, pid),
336
337 TP_STRUCT__entry(
338 __field(const char *, rcuname)
339 __field(unsigned long, gp_seq)
340 __field(int, pid)
341 ),
342
343 TP_fast_assign(
344 __entry->rcuname = rcuname;
345 __entry->gp_seq = gp_seq;
346 __entry->pid = pid;
347 ),
348
349 TP_printk("%s %lu %d", __entry->rcuname, __entry->gp_seq, __entry->pid)
350);
351
352/*
353 * Tracepoint for quiescent-state-reporting events. These are
354 * distinguished by the type of RCU, the grace-period number, the
355 * mask of quiescent lower-level entities, the rcu_node structure level,
356 * the starting and ending CPU covered by the rcu_node structure, and
357 * whether there are any blocked tasks blocking the current grace period.
358 * All but the type of RCU are extracted from the rcu_node structure.
359 */
360TRACE_EVENT_RCU(rcu_quiescent_state_report,
361
362 TP_PROTO(const char *rcuname, unsigned long gp_seq,
363 unsigned long mask, unsigned long qsmask,
364 u8 level, int grplo, int grphi, int gp_tasks),
365
366 TP_ARGS(rcuname, gp_seq, mask, qsmask, level, grplo, grphi, gp_tasks),
367
368 TP_STRUCT__entry(
369 __field(const char *, rcuname)
370 __field(unsigned long, gp_seq)
371 __field(unsigned long, mask)
372 __field(unsigned long, qsmask)
373 __field(u8, level)
374 __field(int, grplo)
375 __field(int, grphi)
376 __field(u8, gp_tasks)
377 ),
378
379 TP_fast_assign(
380 __entry->rcuname = rcuname;
381 __entry->gp_seq = gp_seq;
382 __entry->mask = mask;
383 __entry->qsmask = qsmask;
384 __entry->level = level;
385 __entry->grplo = grplo;
386 __entry->grphi = grphi;
387 __entry->gp_tasks = gp_tasks;
388 ),
389
390 TP_printk("%s %lu %lx>%lx %u %d %d %u",
391 __entry->rcuname, __entry->gp_seq,
392 __entry->mask, __entry->qsmask, __entry->level,
393 __entry->grplo, __entry->grphi, __entry->gp_tasks)
394);
395
396/*
397 * Tracepoint for quiescent states detected by force_quiescent_state().
398 * These trace events include the type of RCU, the grace-period number
399 * that was blocked by the CPU, the CPU itself, and the type of quiescent
400 * state, which can be "dti" for dyntick-idle mode or "kick" when kicking
401 * a CPU that has been in dyntick-idle mode for too long.
402 */
403TRACE_EVENT_RCU(rcu_fqs,
404
405 TP_PROTO(const char *rcuname, unsigned long gp_seq, int cpu, const char *qsevent),
406
407 TP_ARGS(rcuname, gp_seq, cpu, qsevent),
408
409 TP_STRUCT__entry(
410 __field(const char *, rcuname)
411 __field(unsigned long, gp_seq)
412 __field(int, cpu)
413 __field(const char *, qsevent)
414 ),
415
416 TP_fast_assign(
417 __entry->rcuname = rcuname;
418 __entry->gp_seq = gp_seq;
419 __entry->cpu = cpu;
420 __entry->qsevent = qsevent;
421 ),
422
423 TP_printk("%s %lu %d %s",
424 __entry->rcuname, __entry->gp_seq,
425 __entry->cpu, __entry->qsevent)
426);
427
428#endif /* #if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU) */
429
430/*
431 * Tracepoint for dyntick-idle entry/exit events. These take a string
432 * as argument: "Start" for entering dyntick-idle mode, "Startirq" for
433 * entering it from irq/NMI, "End" for leaving it, "Endirq" for leaving it
434 * to irq/NMI, "--=" for events moving towards idle, and "++=" for events
435 * moving away from idle.
436 *
437 * These events also take a pair of numbers, which indicate the nesting
438 * depth before and after the event of interest, and a third number that is
439 * the ->dynticks counter. Note that task-related and interrupt-related
440 * events use two separate counters, and that the "++=" and "--=" events
441 * for irq/NMI will change the counter by two, otherwise by one.
442 */
443TRACE_EVENT_RCU(rcu_dyntick,
444
445 TP_PROTO(const char *polarity, long oldnesting, long newnesting, atomic_t dynticks),
446
447 TP_ARGS(polarity, oldnesting, newnesting, dynticks),
448
449 TP_STRUCT__entry(
450 __field(const char *, polarity)
451 __field(long, oldnesting)
452 __field(long, newnesting)
453 __field(int, dynticks)
454 ),
455
456 TP_fast_assign(
457 __entry->polarity = polarity;
458 __entry->oldnesting = oldnesting;
459 __entry->newnesting = newnesting;
460 __entry->dynticks = atomic_read(&dynticks);
461 ),
462
463 TP_printk("%s %lx %lx %#3x", __entry->polarity,
464 __entry->oldnesting, __entry->newnesting,
465 __entry->dynticks & 0xfff)
466);
467
468/*
469 * Tracepoint for the registration of a single RCU callback function.
470 * The first argument is the type of RCU, the second argument is
471 * a pointer to the RCU callback itself, the third element is the
472 * number of lazy callbacks queued, and the fourth element is the
473 * total number of callbacks queued.
474 */
475TRACE_EVENT_RCU(rcu_callback,
476
477 TP_PROTO(const char *rcuname, struct rcu_head *rhp, long qlen_lazy,
478 long qlen),
479
480 TP_ARGS(rcuname, rhp, qlen_lazy, qlen),
481
482 TP_STRUCT__entry(
483 __field(const char *, rcuname)
484 __field(void *, rhp)
485 __field(void *, func)
486 __field(long, qlen_lazy)
487 __field(long, qlen)
488 ),
489
490 TP_fast_assign(
491 __entry->rcuname = rcuname;
492 __entry->rhp = rhp;
493 __entry->func = rhp->func;
494 __entry->qlen_lazy = qlen_lazy;
495 __entry->qlen = qlen;
496 ),
497
498 TP_printk("%s rhp=%p func=%ps %ld/%ld",
499 __entry->rcuname, __entry->rhp, __entry->func,
500 __entry->qlen_lazy, __entry->qlen)
501);
502
503/*
504 * Tracepoint for the registration of a single RCU callback of the special
505 * kfree() form. The first argument is the RCU type, the second argument
506 * is a pointer to the RCU callback, the third argument is the offset
507 * of the callback within the enclosing RCU-protected data structure,
508 * the fourth argument is the number of lazy callbacks queued, and the
509 * fifth argument is the total number of callbacks queued.
510 */
511TRACE_EVENT_RCU(rcu_kfree_callback,
512
513 TP_PROTO(const char *rcuname, struct rcu_head *rhp, unsigned long offset,
514 long qlen_lazy, long qlen),
515
516 TP_ARGS(rcuname, rhp, offset, qlen_lazy, qlen),
517
518 TP_STRUCT__entry(
519 __field(const char *, rcuname)
520 __field(void *, rhp)
521 __field(unsigned long, offset)
522 __field(long, qlen_lazy)
523 __field(long, qlen)
524 ),
525
526 TP_fast_assign(
527 __entry->rcuname = rcuname;
528 __entry->rhp = rhp;
529 __entry->offset = offset;
530 __entry->qlen_lazy = qlen_lazy;
531 __entry->qlen = qlen;
532 ),
533
534 TP_printk("%s rhp=%p func=%ld %ld/%ld",
535 __entry->rcuname, __entry->rhp, __entry->offset,
536 __entry->qlen_lazy, __entry->qlen)
537);
538
539/*
540 * Tracepoint for marking the beginning rcu_do_batch, performed to start
541 * RCU callback invocation. The first argument is the RCU flavor,
542 * the second is the number of lazy callbacks queued, the third is
543 * the total number of callbacks queued, and the fourth argument is
544 * the current RCU-callback batch limit.
545 */
546TRACE_EVENT_RCU(rcu_batch_start,
547
548 TP_PROTO(const char *rcuname, long qlen_lazy, long qlen, long blimit),
549
550 TP_ARGS(rcuname, qlen_lazy, qlen, blimit),
551
552 TP_STRUCT__entry(
553 __field(const char *, rcuname)
554 __field(long, qlen_lazy)
555 __field(long, qlen)
556 __field(long, blimit)
557 ),
558
559 TP_fast_assign(
560 __entry->rcuname = rcuname;
561 __entry->qlen_lazy = qlen_lazy;
562 __entry->qlen = qlen;
563 __entry->blimit = blimit;
564 ),
565
566 TP_printk("%s CBs=%ld/%ld bl=%ld",
567 __entry->rcuname, __entry->qlen_lazy, __entry->qlen,
568 __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 * kfree() 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_kfree_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 exiting rcu_do_batch after RCU callbacks have been
629 * invoked. The first argument is the name of the RCU flavor,
630 * the second argument is number of callbacks actually invoked,
631 * the third argument (cb) is whether or not any of the callbacks that
632 * were ready to invoke at the beginning of this batch are still
633 * queued, the fourth argument (nr) is the return value of need_resched(),
634 * the fifth argument (iit) is 1 if the current task is the idle task,
635 * and the sixth argument (risk) is the return value from
636 * rcu_is_callbacks_kthread().
637 */
638TRACE_EVENT_RCU(rcu_batch_end,
639
640 TP_PROTO(const char *rcuname, int callbacks_invoked,
641 char cb, char nr, char iit, char risk),
642
643 TP_ARGS(rcuname, callbacks_invoked, cb, nr, iit, risk),
644
645 TP_STRUCT__entry(
646 __field(const char *, rcuname)
647 __field(int, callbacks_invoked)
648 __field(char, cb)
649 __field(char, nr)
650 __field(char, iit)
651 __field(char, risk)
652 ),
653
654 TP_fast_assign(
655 __entry->rcuname = rcuname;
656 __entry->callbacks_invoked = callbacks_invoked;
657 __entry->cb = cb;
658 __entry->nr = nr;
659 __entry->iit = iit;
660 __entry->risk = risk;
661 ),
662
663 TP_printk("%s CBs-invoked=%d idle=%c%c%c%c",
664 __entry->rcuname, __entry->callbacks_invoked,
665 __entry->cb ? 'C' : '.',
666 __entry->nr ? 'S' : '.',
667 __entry->iit ? 'I' : '.',
668 __entry->risk ? 'R' : '.')
669);
670
671/*
672 * Tracepoint for rcutorture readers. The first argument is the name
673 * of the RCU flavor from rcutorture's viewpoint and the second argument
674 * is the callback address. The third argument is the start time in
675 * seconds, and the last two arguments are the grace period numbers
676 * at the beginning and end of the read, respectively. Note that the
677 * callback address can be NULL.
678 */
679#define RCUTORTURENAME_LEN 8
680TRACE_EVENT_RCU(rcu_torture_read,
681
682 TP_PROTO(const char *rcutorturename, struct rcu_head *rhp,
683 unsigned long secs, unsigned long c_old, unsigned long c),
684
685 TP_ARGS(rcutorturename, rhp, secs, c_old, c),
686
687 TP_STRUCT__entry(
688 __field(char, rcutorturename[RCUTORTURENAME_LEN])
689 __field(struct rcu_head *, rhp)
690 __field(unsigned long, secs)
691 __field(unsigned long, c_old)
692 __field(unsigned long, c)
693 ),
694
695 TP_fast_assign(
696 strncpy(__entry->rcutorturename, rcutorturename,
697 RCUTORTURENAME_LEN);
698 __entry->rcutorturename[RCUTORTURENAME_LEN - 1] = 0;
699 __entry->rhp = rhp;
700 __entry->secs = secs;
701 __entry->c_old = c_old;
702 __entry->c = c;
703 ),
704
705 TP_printk("%s torture read %p %luus c: %lu %lu",
706 __entry->rcutorturename, __entry->rhp,
707 __entry->secs, __entry->c_old, __entry->c)
708);
709
710/*
711 * Tracepoint for rcu_barrier() execution. The string "s" describes
712 * the rcu_barrier phase:
713 * "Begin": rcu_barrier() started.
714 * "EarlyExit": rcu_barrier() piggybacked, thus early exit.
715 * "Inc1": rcu_barrier() piggyback check counter incremented.
716 * "OfflineNoCB": rcu_barrier() found callback on never-online CPU
717 * "OnlineNoCB": rcu_barrier() found online no-CBs CPU.
718 * "OnlineQ": rcu_barrier() found online CPU with callbacks.
719 * "OnlineNQ": rcu_barrier() found online CPU, no callbacks.
720 * "IRQ": An rcu_barrier_callback() callback posted on remote CPU.
721 * "IRQNQ": An rcu_barrier_callback() callback found no callbacks.
722 * "CB": An rcu_barrier_callback() invoked a callback, not the last.
723 * "LastCB": An rcu_barrier_callback() invoked the last callback.
724 * "Inc2": rcu_barrier() piggyback check counter incremented.
725 * The "cpu" argument is the CPU or -1 if meaningless, the "cnt" argument
726 * is the count of remaining callbacks, and "done" is the piggybacking count.
727 */
728TRACE_EVENT_RCU(rcu_barrier,
729
730 TP_PROTO(const char *rcuname, const char *s, int cpu, int cnt, unsigned long done),
731
732 TP_ARGS(rcuname, s, cpu, cnt, done),
733
734 TP_STRUCT__entry(
735 __field(const char *, rcuname)
736 __field(const char *, s)
737 __field(int, cpu)
738 __field(int, cnt)
739 __field(unsigned long, done)
740 ),
741
742 TP_fast_assign(
743 __entry->rcuname = rcuname;
744 __entry->s = s;
745 __entry->cpu = cpu;
746 __entry->cnt = cnt;
747 __entry->done = done;
748 ),
749
750 TP_printk("%s %s cpu %d remaining %d # %lu",
751 __entry->rcuname, __entry->s, __entry->cpu, __entry->cnt,
752 __entry->done)
753);
754
755#endif /* _TRACE_RCU_H */
756
757/* This part must be outside protection */
758#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_TREE_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 * "WakeOvf": Wake rcuo kthread, CB list is huge.
184 * "WakeNot": Don't wake rcuo kthread.
185 * "WakeNotPoll": Don't wake rcuo kthread because it is polling.
186 * "Poll": Start of new polling cycle for rcu_nocb_poll.
187 * "Sleep": Sleep waiting for CBs for !rcu_nocb_poll.
188 * "WokeEmpty": rcuo kthread woke to find empty list.
189 * "WokeNonEmpty": rcuo kthread woke to find non-empty list.
190 * "WaitQueue": Enqueue partially done, timed wait for it to complete.
191 * "WokeQueue": Partial enqueue now complete.
192 */
193TRACE_EVENT(rcu_nocb_wake,
194
195 TP_PROTO(const char *rcuname, int cpu, const char *reason),
196
197 TP_ARGS(rcuname, cpu, reason),
198
199 TP_STRUCT__entry(
200 __field(const char *, rcuname)
201 __field(int, cpu)
202 __field(const char *, reason)
203 ),
204
205 TP_fast_assign(
206 __entry->rcuname = rcuname;
207 __entry->cpu = cpu;
208 __entry->reason = reason;
209 ),
210
211 TP_printk("%s %d %s", __entry->rcuname, __entry->cpu, __entry->reason)
212);
213
214/*
215 * Tracepoint for tasks blocking within preemptible-RCU read-side
216 * critical sections. Track the type of RCU (which one day might
217 * include SRCU), the grace-period number that the task is blocking
218 * (the current or the next), and the task's PID.
219 */
220TRACE_EVENT(rcu_preempt_task,
221
222 TP_PROTO(const char *rcuname, int pid, unsigned long gpnum),
223
224 TP_ARGS(rcuname, pid, gpnum),
225
226 TP_STRUCT__entry(
227 __field(const char *, rcuname)
228 __field(unsigned long, gpnum)
229 __field(int, pid)
230 ),
231
232 TP_fast_assign(
233 __entry->rcuname = rcuname;
234 __entry->gpnum = gpnum;
235 __entry->pid = pid;
236 ),
237
238 TP_printk("%s %lu %d",
239 __entry->rcuname, __entry->gpnum, __entry->pid)
240);
241
242/*
243 * Tracepoint for tasks that blocked within a given preemptible-RCU
244 * read-side critical section exiting that critical section. Track the
245 * type of RCU (which one day might include SRCU) and the task's PID.
246 */
247TRACE_EVENT(rcu_unlock_preempted_task,
248
249 TP_PROTO(const char *rcuname, unsigned long gpnum, int pid),
250
251 TP_ARGS(rcuname, gpnum, pid),
252
253 TP_STRUCT__entry(
254 __field(const char *, rcuname)
255 __field(unsigned long, gpnum)
256 __field(int, pid)
257 ),
258
259 TP_fast_assign(
260 __entry->rcuname = rcuname;
261 __entry->gpnum = gpnum;
262 __entry->pid = pid;
263 ),
264
265 TP_printk("%s %lu %d", __entry->rcuname, __entry->gpnum, __entry->pid)
266);
267
268/*
269 * Tracepoint for quiescent-state-reporting events. These are
270 * distinguished by the type of RCU, the grace-period number, the
271 * mask of quiescent lower-level entities, the rcu_node structure level,
272 * the starting and ending CPU covered by the rcu_node structure, and
273 * whether there are any blocked tasks blocking the current grace period.
274 * All but the type of RCU are extracted from the rcu_node structure.
275 */
276TRACE_EVENT(rcu_quiescent_state_report,
277
278 TP_PROTO(const char *rcuname, unsigned long gpnum,
279 unsigned long mask, unsigned long qsmask,
280 u8 level, int grplo, int grphi, int gp_tasks),
281
282 TP_ARGS(rcuname, gpnum, mask, qsmask, level, grplo, grphi, gp_tasks),
283
284 TP_STRUCT__entry(
285 __field(const char *, rcuname)
286 __field(unsigned long, gpnum)
287 __field(unsigned long, mask)
288 __field(unsigned long, qsmask)
289 __field(u8, level)
290 __field(int, grplo)
291 __field(int, grphi)
292 __field(u8, gp_tasks)
293 ),
294
295 TP_fast_assign(
296 __entry->rcuname = rcuname;
297 __entry->gpnum = gpnum;
298 __entry->mask = mask;
299 __entry->qsmask = qsmask;
300 __entry->level = level;
301 __entry->grplo = grplo;
302 __entry->grphi = grphi;
303 __entry->gp_tasks = gp_tasks;
304 ),
305
306 TP_printk("%s %lu %lx>%lx %u %d %d %u",
307 __entry->rcuname, __entry->gpnum,
308 __entry->mask, __entry->qsmask, __entry->level,
309 __entry->grplo, __entry->grphi, __entry->gp_tasks)
310);
311
312/*
313 * Tracepoint for quiescent states detected by force_quiescent_state().
314 * These trace events include the type of RCU, the grace-period number
315 * that was blocked by the CPU, the CPU itself, and the type of quiescent
316 * state, which can be "dti" for dyntick-idle mode, "ofl" for CPU offline,
317 * or "kick" when kicking a CPU that has been in dyntick-idle mode for
318 * too long.
319 */
320TRACE_EVENT(rcu_fqs,
321
322 TP_PROTO(const char *rcuname, unsigned long gpnum, int cpu, const char *qsevent),
323
324 TP_ARGS(rcuname, gpnum, cpu, qsevent),
325
326 TP_STRUCT__entry(
327 __field(const char *, rcuname)
328 __field(unsigned long, gpnum)
329 __field(int, cpu)
330 __field(const char *, qsevent)
331 ),
332
333 TP_fast_assign(
334 __entry->rcuname = rcuname;
335 __entry->gpnum = gpnum;
336 __entry->cpu = cpu;
337 __entry->qsevent = qsevent;
338 ),
339
340 TP_printk("%s %lu %d %s",
341 __entry->rcuname, __entry->gpnum,
342 __entry->cpu, __entry->qsevent)
343);
344
345#endif /* #if defined(CONFIG_TREE_RCU) || defined(CONFIG_TREE_PREEMPT_RCU) */
346
347/*
348 * Tracepoint for dyntick-idle entry/exit events. These take a string
349 * as argument: "Start" for entering dyntick-idle mode, "End" for
350 * leaving it, "--=" for events moving towards idle, and "++=" for events
351 * moving away from idle. "Error on entry: not idle task" and "Error on
352 * exit: not idle task" indicate that a non-idle task is erroneously
353 * toying with the idle loop.
354 *
355 * These events also take a pair of numbers, which indicate the nesting
356 * depth before and after the event of interest. Note that task-related
357 * events use the upper bits of each number, while interrupt-related
358 * events use the lower bits.
359 */
360TRACE_EVENT(rcu_dyntick,
361
362 TP_PROTO(const char *polarity, long long oldnesting, long long newnesting),
363
364 TP_ARGS(polarity, oldnesting, newnesting),
365
366 TP_STRUCT__entry(
367 __field(const char *, polarity)
368 __field(long long, oldnesting)
369 __field(long long, newnesting)
370 ),
371
372 TP_fast_assign(
373 __entry->polarity = polarity;
374 __entry->oldnesting = oldnesting;
375 __entry->newnesting = newnesting;
376 ),
377
378 TP_printk("%s %llx %llx", __entry->polarity,
379 __entry->oldnesting, __entry->newnesting)
380);
381
382/*
383 * Tracepoint for RCU preparation for idle, the goal being to get RCU
384 * processing done so that the current CPU can shut off its scheduling
385 * clock and enter dyntick-idle mode. One way to accomplish this is
386 * to drain all RCU callbacks from this CPU, and the other is to have
387 * done everything RCU requires for the current grace period. In this
388 * latter case, the CPU will be awakened at the end of the current grace
389 * period in order to process the remainder of its callbacks.
390 *
391 * These tracepoints take a string as argument:
392 *
393 * "No callbacks": Nothing to do, no callbacks on this CPU.
394 * "In holdoff": Nothing to do, holding off after unsuccessful attempt.
395 * "Begin holdoff": Attempt failed, don't retry until next jiffy.
396 * "Dyntick with callbacks": Entering dyntick-idle despite callbacks.
397 * "Dyntick with lazy callbacks": Entering dyntick-idle w/lazy callbacks.
398 * "More callbacks": Still more callbacks, try again to clear them out.
399 * "Callbacks drained": All callbacks processed, off to dyntick idle!
400 * "Timer": Timer fired to cause CPU to continue processing callbacks.
401 * "Demigrate": Timer fired on wrong CPU, woke up correct CPU.
402 * "Cleanup after idle": Idle exited, timer canceled.
403 */
404TRACE_EVENT(rcu_prep_idle,
405
406 TP_PROTO(const char *reason),
407
408 TP_ARGS(reason),
409
410 TP_STRUCT__entry(
411 __field(const char *, reason)
412 ),
413
414 TP_fast_assign(
415 __entry->reason = reason;
416 ),
417
418 TP_printk("%s", __entry->reason)
419);
420
421/*
422 * Tracepoint for the registration of a single RCU callback function.
423 * The first argument is the type of RCU, the second argument is
424 * a pointer to the RCU callback itself, the third element is the
425 * number of lazy callbacks queued, and the fourth element is the
426 * total number of callbacks queued.
427 */
428TRACE_EVENT(rcu_callback,
429
430 TP_PROTO(const char *rcuname, struct rcu_head *rhp, long qlen_lazy,
431 long qlen),
432
433 TP_ARGS(rcuname, rhp, qlen_lazy, qlen),
434
435 TP_STRUCT__entry(
436 __field(const char *, rcuname)
437 __field(void *, rhp)
438 __field(void *, func)
439 __field(long, qlen_lazy)
440 __field(long, qlen)
441 ),
442
443 TP_fast_assign(
444 __entry->rcuname = rcuname;
445 __entry->rhp = rhp;
446 __entry->func = rhp->func;
447 __entry->qlen_lazy = qlen_lazy;
448 __entry->qlen = qlen;
449 ),
450
451 TP_printk("%s rhp=%p func=%pf %ld/%ld",
452 __entry->rcuname, __entry->rhp, __entry->func,
453 __entry->qlen_lazy, __entry->qlen)
454);
455
456/*
457 * Tracepoint for the registration of a single RCU callback of the special
458 * kfree() form. The first argument is the RCU type, the second argument
459 * is a pointer to the RCU callback, the third argument is the offset
460 * of the callback within the enclosing RCU-protected data structure,
461 * the fourth argument is the number of lazy callbacks queued, and the
462 * fifth argument is the total number of callbacks queued.
463 */
464TRACE_EVENT(rcu_kfree_callback,
465
466 TP_PROTO(const char *rcuname, struct rcu_head *rhp, unsigned long offset,
467 long qlen_lazy, long qlen),
468
469 TP_ARGS(rcuname, rhp, offset, qlen_lazy, qlen),
470
471 TP_STRUCT__entry(
472 __field(const char *, rcuname)
473 __field(void *, rhp)
474 __field(unsigned long, offset)
475 __field(long, qlen_lazy)
476 __field(long, qlen)
477 ),
478
479 TP_fast_assign(
480 __entry->rcuname = rcuname;
481 __entry->rhp = rhp;
482 __entry->offset = offset;
483 __entry->qlen_lazy = qlen_lazy;
484 __entry->qlen = qlen;
485 ),
486
487 TP_printk("%s rhp=%p func=%ld %ld/%ld",
488 __entry->rcuname, __entry->rhp, __entry->offset,
489 __entry->qlen_lazy, __entry->qlen)
490);
491
492/*
493 * Tracepoint for marking the beginning rcu_do_batch, performed to start
494 * RCU callback invocation. The first argument is the RCU flavor,
495 * the second is the number of lazy callbacks queued, the third is
496 * the total number of callbacks queued, and the fourth argument is
497 * the current RCU-callback batch limit.
498 */
499TRACE_EVENT(rcu_batch_start,
500
501 TP_PROTO(const char *rcuname, long qlen_lazy, long qlen, long blimit),
502
503 TP_ARGS(rcuname, qlen_lazy, qlen, blimit),
504
505 TP_STRUCT__entry(
506 __field(const char *, rcuname)
507 __field(long, qlen_lazy)
508 __field(long, qlen)
509 __field(long, blimit)
510 ),
511
512 TP_fast_assign(
513 __entry->rcuname = rcuname;
514 __entry->qlen_lazy = qlen_lazy;
515 __entry->qlen = qlen;
516 __entry->blimit = blimit;
517 ),
518
519 TP_printk("%s CBs=%ld/%ld bl=%ld",
520 __entry->rcuname, __entry->qlen_lazy, __entry->qlen,
521 __entry->blimit)
522);
523
524/*
525 * Tracepoint for the invocation of a single RCU callback function.
526 * The first argument is the type of RCU, and the second argument is
527 * a pointer to the RCU callback itself.
528 */
529TRACE_EVENT(rcu_invoke_callback,
530
531 TP_PROTO(const char *rcuname, struct rcu_head *rhp),
532
533 TP_ARGS(rcuname, rhp),
534
535 TP_STRUCT__entry(
536 __field(const char *, rcuname)
537 __field(void *, rhp)
538 __field(void *, func)
539 ),
540
541 TP_fast_assign(
542 __entry->rcuname = rcuname;
543 __entry->rhp = rhp;
544 __entry->func = rhp->func;
545 ),
546
547 TP_printk("%s rhp=%p func=%pf",
548 __entry->rcuname, __entry->rhp, __entry->func)
549);
550
551/*
552 * Tracepoint for the invocation of a single RCU callback of the special
553 * kfree() form. The first argument is the RCU flavor, the second
554 * argument is a pointer to the RCU callback, and the third argument
555 * is the offset of the callback within the enclosing RCU-protected
556 * data structure.
557 */
558TRACE_EVENT(rcu_invoke_kfree_callback,
559
560 TP_PROTO(const char *rcuname, struct rcu_head *rhp, unsigned long offset),
561
562 TP_ARGS(rcuname, rhp, offset),
563
564 TP_STRUCT__entry(
565 __field(const char *, rcuname)
566 __field(void *, rhp)
567 __field(unsigned long, offset)
568 ),
569
570 TP_fast_assign(
571 __entry->rcuname = rcuname;
572 __entry->rhp = rhp;
573 __entry->offset = offset;
574 ),
575
576 TP_printk("%s rhp=%p func=%ld",
577 __entry->rcuname, __entry->rhp, __entry->offset)
578);
579
580/*
581 * Tracepoint for exiting rcu_do_batch after RCU callbacks have been
582 * invoked. The first argument is the name of the RCU flavor,
583 * the second argument is number of callbacks actually invoked,
584 * the third argument (cb) is whether or not any of the callbacks that
585 * were ready to invoke at the beginning of this batch are still
586 * queued, the fourth argument (nr) is the return value of need_resched(),
587 * the fifth argument (iit) is 1 if the current task is the idle task,
588 * and the sixth argument (risk) is the return value from
589 * rcu_is_callbacks_kthread().
590 */
591TRACE_EVENT(rcu_batch_end,
592
593 TP_PROTO(const char *rcuname, int callbacks_invoked,
594 char cb, char nr, char iit, char risk),
595
596 TP_ARGS(rcuname, callbacks_invoked, cb, nr, iit, risk),
597
598 TP_STRUCT__entry(
599 __field(const char *, rcuname)
600 __field(int, callbacks_invoked)
601 __field(char, cb)
602 __field(char, nr)
603 __field(char, iit)
604 __field(char, risk)
605 ),
606
607 TP_fast_assign(
608 __entry->rcuname = rcuname;
609 __entry->callbacks_invoked = callbacks_invoked;
610 __entry->cb = cb;
611 __entry->nr = nr;
612 __entry->iit = iit;
613 __entry->risk = risk;
614 ),
615
616 TP_printk("%s CBs-invoked=%d idle=%c%c%c%c",
617 __entry->rcuname, __entry->callbacks_invoked,
618 __entry->cb ? 'C' : '.',
619 __entry->nr ? 'S' : '.',
620 __entry->iit ? 'I' : '.',
621 __entry->risk ? 'R' : '.')
622);
623
624/*
625 * Tracepoint for rcutorture readers. The first argument is the name
626 * of the RCU flavor from rcutorture's viewpoint and the second argument
627 * is the callback address.
628 */
629TRACE_EVENT(rcu_torture_read,
630
631 TP_PROTO(const char *rcutorturename, struct rcu_head *rhp,
632 unsigned long secs, unsigned long c_old, unsigned long c),
633
634 TP_ARGS(rcutorturename, rhp, secs, c_old, c),
635
636 TP_STRUCT__entry(
637 __field(const char *, rcutorturename)
638 __field(struct rcu_head *, rhp)
639 __field(unsigned long, secs)
640 __field(unsigned long, c_old)
641 __field(unsigned long, c)
642 ),
643
644 TP_fast_assign(
645 __entry->rcutorturename = rcutorturename;
646 __entry->rhp = rhp;
647 __entry->secs = secs;
648 __entry->c_old = c_old;
649 __entry->c = c;
650 ),
651
652 TP_printk("%s torture read %p %luus c: %lu %lu",
653 __entry->rcutorturename, __entry->rhp,
654 __entry->secs, __entry->c_old, __entry->c)
655);
656
657/*
658 * Tracepoint for _rcu_barrier() execution. The string "s" describes
659 * the _rcu_barrier phase:
660 * "Begin": rcu_barrier_callback() started.
661 * "Check": rcu_barrier_callback() checking for piggybacking.
662 * "EarlyExit": rcu_barrier_callback() piggybacked, thus early exit.
663 * "Inc1": rcu_barrier_callback() piggyback check counter incremented.
664 * "Offline": rcu_barrier_callback() found offline CPU
665 * "OnlineNoCB": rcu_barrier_callback() found online no-CBs CPU.
666 * "OnlineQ": rcu_barrier_callback() found online CPU with callbacks.
667 * "OnlineNQ": rcu_barrier_callback() found online CPU, no callbacks.
668 * "IRQ": An rcu_barrier_callback() callback posted on remote CPU.
669 * "CB": An rcu_barrier_callback() invoked a callback, not the last.
670 * "LastCB": An rcu_barrier_callback() invoked the last callback.
671 * "Inc2": rcu_barrier_callback() piggyback check counter incremented.
672 * The "cpu" argument is the CPU or -1 if meaningless, the "cnt" argument
673 * is the count of remaining callbacks, and "done" is the piggybacking count.
674 */
675TRACE_EVENT(rcu_barrier,
676
677 TP_PROTO(const char *rcuname, const char *s, int cpu, int cnt, unsigned long done),
678
679 TP_ARGS(rcuname, s, cpu, cnt, done),
680
681 TP_STRUCT__entry(
682 __field(const char *, rcuname)
683 __field(const char *, s)
684 __field(int, cpu)
685 __field(int, cnt)
686 __field(unsigned long, done)
687 ),
688
689 TP_fast_assign(
690 __entry->rcuname = rcuname;
691 __entry->s = s;
692 __entry->cpu = cpu;
693 __entry->cnt = cnt;
694 __entry->done = done;
695 ),
696
697 TP_printk("%s %s cpu %d remaining %d # %lu",
698 __entry->rcuname, __entry->s, __entry->cpu, __entry->cnt,
699 __entry->done)
700);
701
702#else /* #ifdef CONFIG_RCU_TRACE */
703
704#define trace_rcu_grace_period(rcuname, gpnum, gpevent) do { } while (0)
705#define trace_rcu_grace_period_init(rcuname, gpnum, level, grplo, grphi, \
706 qsmask) do { } while (0)
707#define trace_rcu_future_grace_period(rcuname, gpnum, completed, c, \
708 level, grplo, grphi, event) \
709 do { } while (0)
710#define trace_rcu_nocb_wake(rcuname, cpu, reason) do { } while (0)
711#define trace_rcu_preempt_task(rcuname, pid, gpnum) do { } while (0)
712#define trace_rcu_unlock_preempted_task(rcuname, gpnum, pid) do { } while (0)
713#define trace_rcu_quiescent_state_report(rcuname, gpnum, mask, qsmask, level, \
714 grplo, grphi, gp_tasks) do { } \
715 while (0)
716#define trace_rcu_fqs(rcuname, gpnum, cpu, qsevent) do { } while (0)
717#define trace_rcu_dyntick(polarity, oldnesting, newnesting) do { } while (0)
718#define trace_rcu_prep_idle(reason) do { } while (0)
719#define trace_rcu_callback(rcuname, rhp, qlen_lazy, qlen) do { } while (0)
720#define trace_rcu_kfree_callback(rcuname, rhp, offset, qlen_lazy, qlen) \
721 do { } while (0)
722#define trace_rcu_batch_start(rcuname, qlen_lazy, qlen, blimit) \
723 do { } while (0)
724#define trace_rcu_invoke_callback(rcuname, rhp) do { } while (0)
725#define trace_rcu_invoke_kfree_callback(rcuname, rhp, offset) do { } while (0)
726#define trace_rcu_batch_end(rcuname, callbacks_invoked, cb, nr, iit, risk) \
727 do { } while (0)
728#define trace_rcu_torture_read(rcutorturename, rhp, secs, c_old, c) \
729 do { } while (0)
730#define trace_rcu_barrier(name, s, cpu, cnt, done) do { } while (0)
731
732#endif /* #else #ifdef CONFIG_RCU_TRACE */
733
734#endif /* _TRACE_RCU_H */
735
736/* This part must be outside protection */
737#include <trace/define_trace.h>