Branch data Line data Source code
1 : : /* SPDX-License-Identifier: GPL-2.0 */
2 : : #undef TRACE_SYSTEM
3 : : #define TRACE_SYSTEM rcu
4 : :
5 : : #if !defined(_TRACE_RCU_H) || defined(TRACE_HEADER_MULTI_READ)
6 : : #define _TRACE_RCU_H
7 : :
8 : : #include <linux/tracepoint.h>
9 : :
10 : : #ifdef CONFIG_RCU_TRACE
11 : : #define TRACE_EVENT_RCU TRACE_EVENT
12 : : #else
13 : : #define TRACE_EVENT_RCU TRACE_EVENT_NOP
14 : : #endif
15 : :
16 : : /*
17 : : * Tracepoint for start/end markers used for utilization calculations.
18 : : * By convention, the string is of the following forms:
19 : : *
20 : : * "Start <activity>" -- Mark the start of the specified activity,
21 : : * such as "context switch". Nesting is permitted.
22 : : * "End <activity>" -- Mark the end of the specified activity.
23 : : *
24 : : * An "@" character within "<activity>" is a comment character: Data
25 : : * reduction scripts will ignore the "@" and the remainder of the line.
26 : : */
27 [ - + # # : 73100235 : TRACE_EVENT(rcu_utilization,
# # # # #
# # # ]
28 : :
29 : : TP_PROTO(const char *s),
30 : :
31 : : TP_ARGS(s),
32 : :
33 : : TP_STRUCT__entry(
34 : : __field(const char *, s)
35 : : ),
36 : :
37 : : TP_fast_assign(
38 : : __entry->s = s;
39 : : ),
40 : :
41 : : TP_printk("%s", __entry->s)
42 : : );
43 : :
44 : : #if defined(CONFIG_TREE_RCU) || 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 : : */
69 : : TRACE_EVENT_RCU(rcu_grace_period,
70 : :
71 : : TP_PROTO(const char *rcuname, unsigned long gp_seq, const char *gpevent),
72 : :
73 : : TP_ARGS(rcuname, gp_seq, gpevent),
74 : :
75 : : TP_STRUCT__entry(
76 : : __field(const char *, rcuname)
77 : : __field(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 : : */
107 : : TRACE_EVENT_RCU(rcu_future_grace_period,
108 : :
109 : : TP_PROTO(const char *rcuname, unsigned long gp_seq,
110 : : unsigned long gp_seq_req, u8 level, int grplo, int grphi,
111 : : const char *gpevent),
112 : :
113 : : TP_ARGS(rcuname, gp_seq, gp_seq_req, level, grplo, grphi, gpevent),
114 : :
115 : : TP_STRUCT__entry(
116 : : __field(const char *, rcuname)
117 : : __field(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 : : */
147 : : TRACE_EVENT_RCU(rcu_grace_period_init,
148 : :
149 : : TP_PROTO(const char *rcuname, unsigned long gp_seq, u8 level,
150 : : int grplo, int grphi, unsigned long qsmask),
151 : :
152 : : TP_ARGS(rcuname, gp_seq, level, grplo, grphi, qsmask),
153 : :
154 : : TP_STRUCT__entry(
155 : : __field(const char *, rcuname)
156 : : __field(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 : : */
192 : : TRACE_EVENT_RCU(rcu_exp_grace_period,
193 : :
194 : : TP_PROTO(const char *rcuname, unsigned long gpseq, const char *gpevent),
195 : :
196 : : TP_ARGS(rcuname, gpseq, gpevent),
197 : :
198 : : TP_STRUCT__entry(
199 : : __field(const char *, rcuname)
200 : : __field(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 : : */
224 : : TRACE_EVENT_RCU(rcu_exp_funnel_lock,
225 : :
226 : : TP_PROTO(const char *rcuname, u8 level, int grplo, int grphi,
227 : : const char *gpevent),
228 : :
229 : : TP_ARGS(rcuname, level, grplo, grphi, gpevent),
230 : :
231 : : TP_STRUCT__entry(
232 : : __field(const char *, rcuname)
233 : : __field(u8, level)
234 : : __field(int, grplo)
235 : : __field(int, grphi)
236 : : __field(const char *, gpevent)
237 : : ),
238 : :
239 : : TP_fast_assign(
240 : : __entry->rcuname = rcuname;
241 : : __entry->level = level;
242 : : __entry->grplo = grplo;
243 : : __entry->grphi = grphi;
244 : : __entry->gpevent = gpevent;
245 : : ),
246 : :
247 : : TP_printk("%s %d %d %d %s",
248 : : __entry->rcuname, __entry->level, __entry->grplo,
249 : : __entry->grphi, __entry->gpevent)
250 : : );
251 : :
252 : : #ifdef CONFIG_RCU_NOCB_CPU
253 : : /*
254 : : * Tracepoint for RCU no-CBs CPU callback handoffs. This event is intended
255 : : * to assist debugging of these handoffs.
256 : : *
257 : : * The first argument is the name of the RCU flavor, and the second is
258 : : * the number of the offloaded CPU are extracted. The third and final
259 : : * argument is a string as follows:
260 : : *
261 : : * "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 : : */
276 : : TRACE_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 : : */
304 : : TRACE_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 : : */
331 : : TRACE_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 : : */
360 : : TRACE_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 : : */
403 : : TRACE_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 : : */
443 : : TRACE_EVENT_RCU(rcu_dyntick,
444 : :
445 : : TP_PROTO(const char *polarity, long oldnesting, long newnesting, int 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 = 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 : : */
475 : : TRACE_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 : : */
511 : : TRACE_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 : : */
546 : : TRACE_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 : : */
576 : : TRACE_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 : : */
605 : : TRACE_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 : : */
638 : : TRACE_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
680 : : TRACE_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 : : */
728 : : TRACE_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>
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