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TOMOYO Linux Cross Reference
Linux/include/trace/events/rcu.h

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

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