2 #define TRACE_SYSTEM rcu
4 #if !defined(_TRACE_RCU_H) || defined(TRACE_HEADER_MULTI_READ)
7 #include <linux/tracepoint.h>
10 * Tracepoint for start/end markers used for utilization calculations.
11 * By convention, the string is of the following forms:
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.
17 * An "@" character within "<activity>" is a comment character: Data
18 * reduction scripts will ignore the "@" and the remainder of the line.
20 TRACE_EVENT(rcu_utilization
,
34 TP_printk("%s", __entry
->s
)
37 #ifdef CONFIG_RCU_TRACE
39 #if defined(CONFIG_TREE_RCU) || defined(CONFIG_TREE_PREEMPT_RCU)
42 * Tracepoint for grace-period events: starting and ending a grace
43 * period ("start" and "end", respectively), a CPU noting the start
44 * of a new grace period or the end of an old grace period ("cpustart"
45 * and "cpuend", respectively), a CPU passing through a quiescent
46 * state ("cpuqs"), a CPU coming online or going offline ("cpuonl"
47 * and "cpuofl", respectively), a CPU being kicked for being too
48 * long in dyntick-idle mode ("kick"), a CPU accelerating its new
49 * callbacks to RCU_NEXT_READY_TAIL ("AccReadyCB"), and a CPU
50 * accelerating its new callbacks to RCU_WAIT_TAIL ("AccWaitCB").
52 TRACE_EVENT(rcu_grace_period
,
54 TP_PROTO(char *rcuname
, unsigned long gpnum
, char *gpevent
),
56 TP_ARGS(rcuname
, gpnum
, gpevent
),
59 __field(char *, rcuname
)
60 __field(unsigned long, gpnum
)
61 __field(char *, gpevent
)
65 __entry
->rcuname
= rcuname
;
66 __entry
->gpnum
= gpnum
;
67 __entry
->gpevent
= gpevent
;
70 TP_printk("%s %lu %s",
71 __entry
->rcuname
, __entry
->gpnum
, __entry
->gpevent
)
75 * Tracepoint for grace-period-initialization events. These are
76 * distinguished by the type of RCU, the new grace-period number, the
77 * rcu_node structure level, the starting and ending CPU covered by the
78 * rcu_node structure, and the mask of CPUs that will be waited for.
79 * All but the type of RCU are extracted from the rcu_node structure.
81 TRACE_EVENT(rcu_grace_period_init
,
83 TP_PROTO(char *rcuname
, unsigned long gpnum
, u8 level
,
84 int grplo
, int grphi
, unsigned long qsmask
),
86 TP_ARGS(rcuname
, gpnum
, level
, grplo
, grphi
, qsmask
),
89 __field(char *, rcuname
)
90 __field(unsigned long, gpnum
)
94 __field(unsigned long, qsmask
)
98 __entry
->rcuname
= rcuname
;
99 __entry
->gpnum
= gpnum
;
100 __entry
->level
= level
;
101 __entry
->grplo
= grplo
;
102 __entry
->grphi
= grphi
;
103 __entry
->qsmask
= qsmask
;
106 TP_printk("%s %lu %u %d %d %lx",
107 __entry
->rcuname
, __entry
->gpnum
, __entry
->level
,
108 __entry
->grplo
, __entry
->grphi
, __entry
->qsmask
)
112 * Tracepoint for tasks blocking within preemptible-RCU read-side
113 * critical sections. Track the type of RCU (which one day might
114 * include SRCU), the grace-period number that the task is blocking
115 * (the current or the next), and the task's PID.
117 TRACE_EVENT(rcu_preempt_task
,
119 TP_PROTO(char *rcuname
, int pid
, unsigned long gpnum
),
121 TP_ARGS(rcuname
, pid
, gpnum
),
124 __field(char *, rcuname
)
125 __field(unsigned long, gpnum
)
130 __entry
->rcuname
= rcuname
;
131 __entry
->gpnum
= gpnum
;
135 TP_printk("%s %lu %d",
136 __entry
->rcuname
, __entry
->gpnum
, __entry
->pid
)
140 * Tracepoint for tasks that blocked within a given preemptible-RCU
141 * read-side critical section exiting that critical section. Track the
142 * type of RCU (which one day might include SRCU) and the task's PID.
144 TRACE_EVENT(rcu_unlock_preempted_task
,
146 TP_PROTO(char *rcuname
, unsigned long gpnum
, int pid
),
148 TP_ARGS(rcuname
, gpnum
, pid
),
151 __field(char *, rcuname
)
152 __field(unsigned long, gpnum
)
157 __entry
->rcuname
= rcuname
;
158 __entry
->gpnum
= gpnum
;
162 TP_printk("%s %lu %d", __entry
->rcuname
, __entry
->gpnum
, __entry
->pid
)
166 * Tracepoint for quiescent-state-reporting events. These are
167 * distinguished by the type of RCU, the grace-period number, the
168 * mask of quiescent lower-level entities, the rcu_node structure level,
169 * the starting and ending CPU covered by the rcu_node structure, and
170 * whether there are any blocked tasks blocking the current grace period.
171 * All but the type of RCU are extracted from the rcu_node structure.
173 TRACE_EVENT(rcu_quiescent_state_report
,
175 TP_PROTO(char *rcuname
, unsigned long gpnum
,
176 unsigned long mask
, unsigned long qsmask
,
177 u8 level
, int grplo
, int grphi
, int gp_tasks
),
179 TP_ARGS(rcuname
, gpnum
, mask
, qsmask
, level
, grplo
, grphi
, gp_tasks
),
182 __field(char *, rcuname
)
183 __field(unsigned long, gpnum
)
184 __field(unsigned long, mask
)
185 __field(unsigned long, qsmask
)
189 __field(u8
, gp_tasks
)
193 __entry
->rcuname
= rcuname
;
194 __entry
->gpnum
= gpnum
;
195 __entry
->mask
= mask
;
196 __entry
->qsmask
= qsmask
;
197 __entry
->level
= level
;
198 __entry
->grplo
= grplo
;
199 __entry
->grphi
= grphi
;
200 __entry
->gp_tasks
= gp_tasks
;
203 TP_printk("%s %lu %lx>%lx %u %d %d %u",
204 __entry
->rcuname
, __entry
->gpnum
,
205 __entry
->mask
, __entry
->qsmask
, __entry
->level
,
206 __entry
->grplo
, __entry
->grphi
, __entry
->gp_tasks
)
210 * Tracepoint for quiescent states detected by force_quiescent_state().
211 * These trace events include the type of RCU, the grace-period number
212 * that was blocked by the CPU, the CPU itself, and the type of quiescent
213 * state, which can be "dti" for dyntick-idle mode, "ofl" for CPU offline,
214 * or "kick" when kicking a CPU that has been in dyntick-idle mode for
219 TP_PROTO(char *rcuname
, unsigned long gpnum
, int cpu
, char *qsevent
),
221 TP_ARGS(rcuname
, gpnum
, cpu
, qsevent
),
224 __field(char *, rcuname
)
225 __field(unsigned long, gpnum
)
227 __field(char *, qsevent
)
231 __entry
->rcuname
= rcuname
;
232 __entry
->gpnum
= gpnum
;
234 __entry
->qsevent
= qsevent
;
237 TP_printk("%s %lu %d %s",
238 __entry
->rcuname
, __entry
->gpnum
,
239 __entry
->cpu
, __entry
->qsevent
)
242 #endif /* #if defined(CONFIG_TREE_RCU) || defined(CONFIG_TREE_PREEMPT_RCU) */
245 * Tracepoint for dyntick-idle entry/exit events. These take a string
246 * as argument: "Start" for entering dyntick-idle mode, "End" for
247 * leaving it, "--=" for events moving towards idle, and "++=" for events
248 * moving away from idle. "Error on entry: not idle task" and "Error on
249 * exit: not idle task" indicate that a non-idle task is erroneously
250 * toying with the idle loop.
252 * These events also take a pair of numbers, which indicate the nesting
253 * depth before and after the event of interest. Note that task-related
254 * events use the upper bits of each number, while interrupt-related
255 * events use the lower bits.
257 TRACE_EVENT(rcu_dyntick
,
259 TP_PROTO(char *polarity
, long long oldnesting
, long long newnesting
),
261 TP_ARGS(polarity
, oldnesting
, newnesting
),
264 __field(char *, polarity
)
265 __field(long long, oldnesting
)
266 __field(long long, newnesting
)
270 __entry
->polarity
= polarity
;
271 __entry
->oldnesting
= oldnesting
;
272 __entry
->newnesting
= newnesting
;
275 TP_printk("%s %llx %llx", __entry
->polarity
,
276 __entry
->oldnesting
, __entry
->newnesting
)
280 * Tracepoint for RCU preparation for idle, the goal being to get RCU
281 * processing done so that the current CPU can shut off its scheduling
282 * clock and enter dyntick-idle mode. One way to accomplish this is
283 * to drain all RCU callbacks from this CPU, and the other is to have
284 * done everything RCU requires for the current grace period. In this
285 * latter case, the CPU will be awakened at the end of the current grace
286 * period in order to process the remainder of its callbacks.
288 * These tracepoints take a string as argument:
290 * "No callbacks": Nothing to do, no callbacks on this CPU.
291 * "In holdoff": Nothing to do, holding off after unsuccessful attempt.
292 * "Begin holdoff": Attempt failed, don't retry until next jiffy.
293 * "Dyntick with callbacks": Entering dyntick-idle despite callbacks.
294 * "Dyntick with lazy callbacks": Entering dyntick-idle w/lazy callbacks.
295 * "More callbacks": Still more callbacks, try again to clear them out.
296 * "Callbacks drained": All callbacks processed, off to dyntick idle!
297 * "Timer": Timer fired to cause CPU to continue processing callbacks.
298 * "Demigrate": Timer fired on wrong CPU, woke up correct CPU.
299 * "Cleanup after idle": Idle exited, timer canceled.
301 TRACE_EVENT(rcu_prep_idle
,
303 TP_PROTO(char *reason
),
308 __field(char *, reason
)
312 __entry
->reason
= reason
;
315 TP_printk("%s", __entry
->reason
)
319 * Tracepoint for the registration of a single RCU callback function.
320 * The first argument is the type of RCU, the second argument is
321 * a pointer to the RCU callback itself, the third element is the
322 * number of lazy callbacks queued, and the fourth element is the
323 * total number of callbacks queued.
325 TRACE_EVENT(rcu_callback
,
327 TP_PROTO(char *rcuname
, struct rcu_head
*rhp
, long qlen_lazy
,
330 TP_ARGS(rcuname
, rhp
, qlen_lazy
, qlen
),
333 __field(char *, rcuname
)
335 __field(void *, func
)
336 __field(long, qlen_lazy
)
341 __entry
->rcuname
= rcuname
;
343 __entry
->func
= rhp
->func
;
344 __entry
->qlen_lazy
= qlen_lazy
;
345 __entry
->qlen
= qlen
;
348 TP_printk("%s rhp=%p func=%pf %ld/%ld",
349 __entry
->rcuname
, __entry
->rhp
, __entry
->func
,
350 __entry
->qlen_lazy
, __entry
->qlen
)
354 * Tracepoint for the registration of a single RCU callback of the special
355 * kfree() form. The first argument is the RCU type, the second argument
356 * is a pointer to the RCU callback, the third argument is the offset
357 * of the callback within the enclosing RCU-protected data structure,
358 * the fourth argument is the number of lazy callbacks queued, and the
359 * fifth argument is the total number of callbacks queued.
361 TRACE_EVENT(rcu_kfree_callback
,
363 TP_PROTO(char *rcuname
, struct rcu_head
*rhp
, unsigned long offset
,
364 long qlen_lazy
, long qlen
),
366 TP_ARGS(rcuname
, rhp
, offset
, qlen_lazy
, qlen
),
369 __field(char *, rcuname
)
371 __field(unsigned long, offset
)
372 __field(long, qlen_lazy
)
377 __entry
->rcuname
= rcuname
;
379 __entry
->offset
= offset
;
380 __entry
->qlen_lazy
= qlen_lazy
;
381 __entry
->qlen
= qlen
;
384 TP_printk("%s rhp=%p func=%ld %ld/%ld",
385 __entry
->rcuname
, __entry
->rhp
, __entry
->offset
,
386 __entry
->qlen_lazy
, __entry
->qlen
)
390 * Tracepoint for marking the beginning rcu_do_batch, performed to start
391 * RCU callback invocation. The first argument is the RCU flavor,
392 * the second is the number of lazy callbacks queued, the third is
393 * the total number of callbacks queued, and the fourth argument is
394 * the current RCU-callback batch limit.
396 TRACE_EVENT(rcu_batch_start
,
398 TP_PROTO(char *rcuname
, long qlen_lazy
, long qlen
, long blimit
),
400 TP_ARGS(rcuname
, qlen_lazy
, qlen
, blimit
),
403 __field(char *, rcuname
)
404 __field(long, qlen_lazy
)
406 __field(long, blimit
)
410 __entry
->rcuname
= rcuname
;
411 __entry
->qlen_lazy
= qlen_lazy
;
412 __entry
->qlen
= qlen
;
413 __entry
->blimit
= blimit
;
416 TP_printk("%s CBs=%ld/%ld bl=%ld",
417 __entry
->rcuname
, __entry
->qlen_lazy
, __entry
->qlen
,
422 * Tracepoint for the invocation of a single RCU callback function.
423 * The first argument is the type of RCU, and the second argument is
424 * a pointer to the RCU callback itself.
426 TRACE_EVENT(rcu_invoke_callback
,
428 TP_PROTO(char *rcuname
, struct rcu_head
*rhp
),
430 TP_ARGS(rcuname
, rhp
),
433 __field(char *, rcuname
)
435 __field(void *, func
)
439 __entry
->rcuname
= rcuname
;
441 __entry
->func
= rhp
->func
;
444 TP_printk("%s rhp=%p func=%pf",
445 __entry
->rcuname
, __entry
->rhp
, __entry
->func
)
449 * Tracepoint for the invocation of a single RCU callback of the special
450 * kfree() form. The first argument is the RCU flavor, the second
451 * argument is a pointer to the RCU callback, and the third argument
452 * is the offset of the callback within the enclosing RCU-protected
455 TRACE_EVENT(rcu_invoke_kfree_callback
,
457 TP_PROTO(char *rcuname
, struct rcu_head
*rhp
, unsigned long offset
),
459 TP_ARGS(rcuname
, rhp
, offset
),
462 __field(char *, rcuname
)
464 __field(unsigned long, offset
)
468 __entry
->rcuname
= rcuname
;
470 __entry
->offset
= offset
;
473 TP_printk("%s rhp=%p func=%ld",
474 __entry
->rcuname
, __entry
->rhp
, __entry
->offset
)
478 * Tracepoint for exiting rcu_do_batch after RCU callbacks have been
479 * invoked. The first argument is the name of the RCU flavor,
480 * the second argument is number of callbacks actually invoked,
481 * the third argument (cb) is whether or not any of the callbacks that
482 * were ready to invoke at the beginning of this batch are still
483 * queued, the fourth argument (nr) is the return value of need_resched(),
484 * the fifth argument (iit) is 1 if the current task is the idle task,
485 * and the sixth argument (risk) is the return value from
486 * rcu_is_callbacks_kthread().
488 TRACE_EVENT(rcu_batch_end
,
490 TP_PROTO(char *rcuname
, int callbacks_invoked
,
491 bool cb
, bool nr
, bool iit
, bool risk
),
493 TP_ARGS(rcuname
, callbacks_invoked
, cb
, nr
, iit
, risk
),
496 __field(char *, rcuname
)
497 __field(int, callbacks_invoked
)
505 __entry
->rcuname
= rcuname
;
506 __entry
->callbacks_invoked
= callbacks_invoked
;
510 __entry
->risk
= risk
;
513 TP_printk("%s CBs-invoked=%d idle=%c%c%c%c",
514 __entry
->rcuname
, __entry
->callbacks_invoked
,
515 __entry
->cb
? 'C' : '.',
516 __entry
->nr
? 'S' : '.',
517 __entry
->iit
? 'I' : '.',
518 __entry
->risk
? 'R' : '.')
522 * Tracepoint for rcutorture readers. The first argument is the name
523 * of the RCU flavor from rcutorture's viewpoint and the second argument
524 * is the callback address.
526 TRACE_EVENT(rcu_torture_read
,
528 TP_PROTO(char *rcutorturename
, struct rcu_head
*rhp
,
529 unsigned long secs
, unsigned long c_old
, unsigned long c
),
531 TP_ARGS(rcutorturename
, rhp
, secs
, c_old
, c
),
534 __field(char *, rcutorturename
)
535 __field(struct rcu_head
*, rhp
)
536 __field(unsigned long, secs
)
537 __field(unsigned long, c_old
)
538 __field(unsigned long, c
)
542 __entry
->rcutorturename
= rcutorturename
;
544 __entry
->secs
= secs
;
545 __entry
->c_old
= c_old
;
549 TP_printk("%s torture read %p %luus c: %lu %lu",
550 __entry
->rcutorturename
, __entry
->rhp
,
551 __entry
->secs
, __entry
->c_old
, __entry
->c
)
555 * Tracepoint for _rcu_barrier() execution. The string "s" describes
556 * the _rcu_barrier phase:
557 * "Begin": rcu_barrier_callback() started.
558 * "Check": rcu_barrier_callback() checking for piggybacking.
559 * "EarlyExit": rcu_barrier_callback() piggybacked, thus early exit.
560 * "Inc1": rcu_barrier_callback() piggyback check counter incremented.
561 * "Offline": rcu_barrier_callback() found offline CPU
562 * "OnlineNoCB": rcu_barrier_callback() found online no-CBs CPU.
563 * "OnlineQ": rcu_barrier_callback() found online CPU with callbacks.
564 * "OnlineNQ": rcu_barrier_callback() found online CPU, no callbacks.
565 * "IRQ": An rcu_barrier_callback() callback posted on remote CPU.
566 * "CB": An rcu_barrier_callback() invoked a callback, not the last.
567 * "LastCB": An rcu_barrier_callback() invoked the last callback.
568 * "Inc2": rcu_barrier_callback() piggyback check counter incremented.
569 * The "cpu" argument is the CPU or -1 if meaningless, the "cnt" argument
570 * is the count of remaining callbacks, and "done" is the piggybacking count.
572 TRACE_EVENT(rcu_barrier
,
574 TP_PROTO(char *rcuname
, char *s
, int cpu
, int cnt
, unsigned long done
),
576 TP_ARGS(rcuname
, s
, cpu
, cnt
, done
),
579 __field(char *, rcuname
)
583 __field(unsigned long, done
)
587 __entry
->rcuname
= rcuname
;
591 __entry
->done
= done
;
594 TP_printk("%s %s cpu %d remaining %d # %lu",
595 __entry
->rcuname
, __entry
->s
, __entry
->cpu
, __entry
->cnt
,
599 #else /* #ifdef CONFIG_RCU_TRACE */
601 #define trace_rcu_grace_period(rcuname, gpnum, gpevent) do { } while (0)
602 #define trace_rcu_grace_period_init(rcuname, gpnum, level, grplo, grphi, \
603 qsmask) do { } while (0)
604 #define trace_rcu_preempt_task(rcuname, pid, gpnum) do { } while (0)
605 #define trace_rcu_unlock_preempted_task(rcuname, gpnum, pid) do { } while (0)
606 #define trace_rcu_quiescent_state_report(rcuname, gpnum, mask, qsmask, level, \
607 grplo, grphi, gp_tasks) do { } \
609 #define trace_rcu_fqs(rcuname, gpnum, cpu, qsevent) do { } while (0)
610 #define trace_rcu_dyntick(polarity, oldnesting, newnesting) do { } while (0)
611 #define trace_rcu_prep_idle(reason) do { } while (0)
612 #define trace_rcu_callback(rcuname, rhp, qlen_lazy, qlen) do { } while (0)
613 #define trace_rcu_kfree_callback(rcuname, rhp, offset, qlen_lazy, qlen) \
615 #define trace_rcu_batch_start(rcuname, qlen_lazy, qlen, blimit) \
617 #define trace_rcu_invoke_callback(rcuname, rhp) do { } while (0)
618 #define trace_rcu_invoke_kfree_callback(rcuname, rhp, offset) do { } while (0)
619 #define trace_rcu_batch_end(rcuname, callbacks_invoked, cb, nr, iit, risk) \
621 #define trace_rcu_torture_read(rcutorturename, rhp, secs, c_old, c) \
623 #define trace_rcu_barrier(name, s, cpu, cnt, done) do { } while (0)
625 #endif /* #else #ifdef CONFIG_RCU_TRACE */
627 #endif /* _TRACE_RCU_H */
629 /* This part must be outside protection */
630 #include <trace/define_trace.h>