summaryrefslogtreecommitdiff
path: root/include/trace/events/rcu.h
blob: 1480900c511ce134443e7bf2f41d8e5ba0f97117 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
#undef TRACE_SYSTEM
#define TRACE_SYSTEM rcu

#if !defined(_TRACE_RCU_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_RCU_H

#include <linux/tracepoint.h>

/*
 * Tracepoint for start/end markers used for utilization calculations.
 * By convention, the string is of the following forms:
 *
 * "Start <activity>" -- Mark the start of the specified activity,
 *			 such as "context switch".  Nesting is permitted.
 * "End <activity>" -- Mark the end of the specified activity.
 *
 * An "@" character within "<activity>" is a comment character: Data
 * reduction scripts will ignore the "@" and the remainder of the line.
 */
TRACE_EVENT(rcu_utilization,

	TP_PROTO(char *s),

	TP_ARGS(s),

	TP_STRUCT__entry(
		__field(char *, s)
	),

	TP_fast_assign(
		__entry->s = s;
	),

	TP_printk("%s", __entry->s)
);

#ifdef CONFIG_RCU_TRACE

#if defined(CONFIG_TREE_RCU) || defined(CONFIG_TREE_PREEMPT_RCU)

/*
 * Tracepoint for grace-period events: starting and ending a grace
 * period ("start" and "end", respectively), a CPU noting the start
 * of a new grace period or the end of an old grace period ("cpustart"
 * and "cpuend", respectively), a CPU passing through a quiescent
 * state ("cpuqs"), a CPU coming online or going offline ("cpuonl"
 * and "cpuofl", respectively), and a CPU being kicked for being too
 * long in dyntick-idle mode ("kick").
 */
TRACE_EVENT(rcu_grace_period,

	TP_PROTO(char *rcuname, unsigned long gpnum, char *gpevent),

	TP_ARGS(rcuname, gpnum, gpevent),

	TP_STRUCT__entry(
		__field(char *, rcuname)
		__field(unsigned long, gpnum)
		__field(char *, gpevent)
	),

	TP_fast_assign(
		__entry->rcuname = rcuname;
		__entry->gpnum = gpnum;
		__entry->gpevent = gpevent;
	),

	TP_printk("%s %lu %s",
		  __entry->rcuname, __entry->gpnum, __entry->gpevent)
);

/*
 * Tracepoint for grace-period-initialization events.  These are
 * distinguished by the type of RCU, the new grace-period number, the
 * rcu_node structure level, the starting and ending CPU covered by the
 * rcu_node structure, and the mask of CPUs that will be waited for.
 * All but the type of RCU are extracted from the rcu_node structure.
 */
TRACE_EVENT(rcu_grace_period_init,

	TP_PROTO(char *rcuname, unsigned long gpnum, u8 level,
		 int grplo, int grphi, unsigned long qsmask),

	TP_ARGS(rcuname, gpnum, level, grplo, grphi, qsmask),

	TP_STRUCT__entry(
		__field(char *, rcuname)
		__field(unsigned long, gpnum)
		__field(u8, level)
		__field(int, grplo)
		__field(int, grphi)
		__field(unsigned long, qsmask)
	),

	TP_fast_assign(
		__entry->rcuname = rcuname;
		__entry->gpnum = gpnum;
		__entry->level = level;
		__entry->grplo = grplo;
		__entry->grphi = grphi;
		__entry->qsmask = qsmask;
	),

	TP_printk("%s %lu %u %d %d %lx",
		  __entry->rcuname, __entry->gpnum, __entry->level,
		  __entry->grplo, __entry->grphi, __entry->qsmask)
);

/*
 * Tracepoint for tasks blocking within preemptible-RCU read-side
 * critical sections.  Track the type of RCU (which one day might
 * include SRCU), the grace-period number that the task is blocking
 * (the current or the next), and the task's PID.
 */
TRACE_EVENT(rcu_preempt_task,

	TP_PROTO(char *rcuname, int pid, unsigned long gpnum),

	TP_ARGS(rcuname, pid, gpnum),

	TP_STRUCT__entry(
		__field(char *, rcuname)
		__field(unsigned long, gpnum)
		__field(int, pid)
	),

	TP_fast_assign(
		__entry->rcuname = rcuname;
		__entry->gpnum = gpnum;
		__entry->pid = pid;
	),

	TP_printk("%s %lu %d",
		  __entry->rcuname, __entry->gpnum, __entry->pid)
);

/*
 * Tracepoint for tasks that blocked within a given preemptible-RCU
 * read-side critical section exiting that critical section.  Track the
 * type of RCU (which one day might include SRCU) and the task's PID.
 */
TRACE_EVENT(rcu_unlock_preempted_task,

	TP_PROTO(char *rcuname, unsigned long gpnum, int pid),

	TP_ARGS(rcuname, gpnum, pid),

	TP_STRUCT__entry(
		__field(char *, rcuname)
		__field(unsigned long, gpnum)
		__field(int, pid)
	),

	TP_fast_assign(
		__entry->rcuname = rcuname;
		__entry->gpnum = gpnum;
		__entry->pid = pid;
	),

	TP_printk("%s %lu %d", __entry->rcuname, __entry->gpnum, __entry->pid)
);

/*
 * Tracepoint for quiescent-state-reporting events.  These are
 * distinguished by the type of RCU, the grace-period number, the
 * mask of quiescent lower-level entities, the rcu_node structure level,
 * the starting and ending CPU covered by the rcu_node structure, and
 * whether there are any blocked tasks blocking the current grace period.
 * All but the type of RCU are extracted from the rcu_node structure.
 */
TRACE_EVENT(rcu_quiescent_state_report,

	TP_PROTO(char *rcuname, unsigned long gpnum,
		 unsigned long mask, unsigned long qsmask,
		 u8 level, int grplo, int grphi, int gp_tasks),

	TP_ARGS(rcuname, gpnum, mask, qsmask, level, grplo, grphi, gp_tasks),

	TP_STRUCT__entry(
		__field(char *, rcuname)
		__field(unsigned long, gpnum)
		__field(unsigned long, mask)
		__field(unsigned long, qsmask)
		__field(u8, level)
		__field(int, grplo)
		__field(int, grphi)
		__field(u8, gp_tasks)
	),

	TP_fast_assign(
		__entry->rcuname = rcuname;
		__entry->gpnum = gpnum;
		__entry->mask = mask;
		__entry->qsmask = qsmask;
		__entry->level = level;
		__entry->grplo = grplo;
		__entry->grphi = grphi;
		__entry->gp_tasks = gp_tasks;
	),

	TP_printk("%s %lu %lx>%lx %u %d %d %u",
		  __entry->rcuname, __entry->gpnum,
		  __entry->mask, __entry->qsmask, __entry->level,
		  __entry->grplo, __entry->grphi, __entry->gp_tasks)
);

/*
 * Tracepoint for quiescent states detected by force_quiescent_state().
 * These trace events include the type of RCU, the grace-period number
 * that was blocked by the CPU, the CPU itself, and the type of quiescent
 * state, which can be "dti" for dyntick-idle mode, "ofl" for CPU offline,
 * or "kick" when kicking a CPU that has been in dyntick-idle mode for
 * too long.
 */
TRACE_EVENT(rcu_fqs,

	TP_PROTO(char *rcuname, unsigned long gpnum, int cpu, char *qsevent),

	TP_ARGS(rcuname, gpnum, cpu, qsevent),

	TP_STRUCT__entry(
		__field(char *, rcuname)
		__field(unsigned long, gpnum)
		__field(int, cpu)
		__field(char *, qsevent)
	),

	TP_fast_assign(
		__entry->rcuname = rcuname;
		__entry->gpnum = gpnum;
		__entry->cpu = cpu;
		__entry->qsevent = qsevent;
	),

	TP_printk("%s %lu %d %s",
		  __entry->rcuname, __entry->gpnum,
		  __entry->cpu, __entry->qsevent)
);

#endif /* #if defined(CONFIG_TREE_RCU) || defined(CONFIG_TREE_PREEMPT_RCU) */

/*
 * Tracepoint for dyntick-idle entry/exit events.  These take a string
 * as argument: "Start" for entering dyntick-idle mode, "End" for
 * leaving it, "--=" for events moving towards idle, and "++=" for events
 * moving away from idle.  "Error on entry: not idle task" and "Error on
 * exit: not idle task" indicate that a non-idle task is erroneously
 * toying with the idle loop.
 *
 * These events also take a pair of numbers, which indicate the nesting
 * depth before and after the event of interest.  Note that task-related
 * events use the upper bits of each number, while interrupt-related
 * events use the lower bits.
 */
TRACE_EVENT(rcu_dyntick,

	TP_PROTO(char *polarity, long long oldnesting, long long newnesting),

	TP_ARGS(polarity, oldnesting, newnesting),

	TP_STRUCT__entry(
		__field(char *, polarity)
		__field(long long, oldnesting)
		__field(long long, newnesting)
	),

	TP_fast_assign(
		__entry->polarity = polarity;
		__entry->oldnesting = oldnesting;
		__entry->newnesting = newnesting;
	),

	TP_printk("%s %llx %llx", __entry->polarity,
		  __entry->oldnesting, __entry->newnesting)
);

/*
 * Tracepoint for RCU preparation for idle, the goal being to get RCU
 * processing done so that the current CPU can shut off its scheduling
 * clock and enter dyntick-idle mode.  One way to accomplish this is
 * to drain all RCU callbacks from this CPU, and the other is to have
 * done everything RCU requires for the current grace period.  In this
 * latter case, the CPU will be awakened at the end of the current grace
 * period in order to process the remainder of its callbacks.
 *
 * These tracepoints take a string as argument:
 *
 *	"No callbacks": Nothing to do, no callbacks on this CPU.
 *	"In holdoff": Nothing to do, holding off after unsuccessful attempt.
 *	"Begin holdoff": Attempt failed, don't retry until next jiffy.
 *	"Dyntick with callbacks": Entering dyntick-idle despite callbacks.
 *	"More callbacks": Still more callbacks, try again to clear them out.
 *	"Callbacks drained": All callbacks processed, off to dyntick idle!
 *	"Timer": Timer fired to cause CPU to continue processing callbacks.
 *	"Demigrate": Timer fired on wrong CPU, woke up correct CPU.
 *	"Cleanup after idle": Idle exited, timer canceled.
 */
TRACE_EVENT(rcu_prep_idle,

	TP_PROTO(char *reason),

	TP_ARGS(reason),

	TP_STRUCT__entry(
		__field(char *, reason)
	),

	TP_fast_assign(
		__entry->reason = reason;
	),

	TP_printk("%s", __entry->reason)
);

/*
 * Tracepoint for the registration of a single RCU callback function.
 * The first argument is the type of RCU, the second argument is
 * a pointer to the RCU callback itself, the third element is the
 * number of lazy callbacks queued, and the fourth element is the
 * total number of callbacks queued.
 */
TRACE_EVENT(rcu_callback,

	TP_PROTO(char *rcuname, struct rcu_head *rhp, long qlen_lazy,
		 long qlen),

	TP_ARGS(rcuname, rhp, qlen_lazy, qlen),

	TP_STRUCT__entry(
		__field(char *, rcuname)
		__field(void *, rhp)
		__field(void *, func)
		__field(long, qlen_lazy)
		__field(long, qlen)
	),

	TP_fast_assign(
		__entry->rcuname = rcuname;
		__entry->rhp = rhp;
		__entry->func = rhp->func;
		__entry->qlen_lazy = qlen_lazy;
		__entry->qlen = qlen;
	),

	TP_printk("%s rhp=%p func=%pf %ld/%ld",
		  __entry->rcuname, __entry->rhp, __entry->func,
		  __entry->qlen_lazy, __entry->qlen)
);

/*
 * Tracepoint for the registration of a single RCU callback of the special
 * kfree() form.  The first argument is the RCU type, the second argument
 * is a pointer to the RCU callback, the third argument is the offset
 * of the callback within the enclosing RCU-protected data structure,
 * the fourth argument is the number of lazy callbacks queued, and the
 * fifth argument is the total number of callbacks queued.
 */
TRACE_EVENT(rcu_kfree_callback,

	TP_PROTO(char *rcuname, struct rcu_head *rhp, unsigned long offset,
		 long qlen_lazy, long qlen),

	TP_ARGS(rcuname, rhp, offset, qlen_lazy, qlen),

	TP_STRUCT__entry(
		__field(char *, rcuname)
		__field(void *, rhp)
		__field(unsigned long, offset)
		__field(long, qlen_lazy)
		__field(long, qlen)
	),

	TP_fast_assign(
		__entry->rcuname = rcuname;
		__entry->rhp = rhp;
		__entry->offset = offset;
		__entry->qlen_lazy = qlen_lazy;
		__entry->qlen = qlen;
	),

	TP_printk("%s rhp=%p func=%ld %ld/%ld",
		  __entry->rcuname, __entry->rhp, __entry->offset,
		  __entry->qlen_lazy, __entry->qlen)
);

/*
 * Tracepoint for marking the beginning rcu_do_batch, performed to start
 * RCU callback invocation.  The first argument is the RCU flavor,
 * the second is the number of lazy callbacks queued, the third is
 * the total number of callbacks queued, and the fourth argument is
 * the current RCU-callback batch limit.
 */
TRACE_EVENT(rcu_batch_start,

	TP_PROTO(char *rcuname, long qlen_lazy, long qlen, int blimit),

	TP_ARGS(rcuname, qlen_lazy, qlen, blimit),

	TP_STRUCT__entry(
		__field(char *, rcuname)
		__field(long, qlen_lazy)
		__field(long, qlen)
		__field(int, blimit)
	),

	TP_fast_assign(
		__entry->rcuname = rcuname;
		__entry->qlen_lazy = qlen_lazy;
		__entry->qlen = qlen;
		__entry->blimit = blimit;
	),

	TP_printk("%s CBs=%ld/%ld bl=%d",
		  __entry->rcuname, __entry->qlen_lazy, __entry->qlen,
		  __entry->blimit)
);

/*
 * Tracepoint for the invocation of a single RCU callback function.
 * The first argument is the type of RCU, and the second argument is
 * a pointer to the RCU callback itself.
 */
TRACE_EVENT(rcu_invoke_callback,

	TP_PROTO(char *rcuname, struct rcu_head *rhp),

	TP_ARGS(rcuname, rhp),

	TP_STRUCT__entry(
		__field(char *, rcuname)
		__field(void *, rhp)
		__field(void *, func)
	),

	TP_fast_assign(
		__entry->rcuname = rcuname;
		__entry->rhp = rhp;
		__entry->func = rhp->func;
	),

	TP_printk("%s rhp=%p func=%pf",
		  __entry->rcuname, __entry->rhp, __entry->func)
);

/*
 * Tracepoint for the invocation of a single RCU callback of the special
 * kfree() form.  The first argument is the RCU flavor, the second
 * argument is a pointer to the RCU callback, and the third argument
 * is the offset of the callback within the enclosing RCU-protected
 * data structure.
 */
TRACE_EVENT(rcu_invoke_kfree_callback,

	TP_PROTO(char *rcuname, struct rcu_head *rhp, unsigned long offset),

	TP_ARGS(rcuname, rhp, offset),

	TP_STRUCT__entry(
		__field(char *, rcuname)
		__field(void *, rhp)
		__field(unsigned long, offset)
	),

	TP_fast_assign(
		__entry->rcuname = rcuname;
		__entry->rhp = rhp;
		__entry->offset	= offset;
	),

	TP_printk("%s rhp=%p func=%ld",
		  __entry->rcuname, __entry->rhp, __entry->offset)
);

/*
 * Tracepoint for exiting rcu_do_batch after RCU callbacks have been
 * invoked.  The first argument is the name of the RCU flavor,
 * the second argument is number of callbacks actually invoked,
 * the third argument (cb) is whether or not any of the callbacks that
 * were ready to invoke at the beginning of this batch are still
 * queued, the fourth argument (nr) is the return value of need_resched(),
 * the fifth argument (iit) is 1 if the current task is the idle task,
 * and the sixth argument (risk) is the return value from
 * rcu_is_callbacks_kthread().
 */
TRACE_EVENT(rcu_batch_end,

	TP_PROTO(char *rcuname, int callbacks_invoked,
		 bool cb, bool nr, bool iit, bool risk),

	TP_ARGS(rcuname, callbacks_invoked, cb, nr, iit, risk),

	TP_STRUCT__entry(
		__field(char *, rcuname)
		__field(int, callbacks_invoked)
		__field(bool, cb)
		__field(bool, nr)
		__field(bool, iit)
		__field(bool, risk)
	),

	TP_fast_assign(
		__entry->rcuname = rcuname;
		__entry->callbacks_invoked = callbacks_invoked;
		__entry->cb = cb;
		__entry->nr = nr;
		__entry->iit = iit;
		__entry->risk = risk;
	),

	TP_printk("%s CBs-invoked=%d idle=%c%c%c%c",
		  __entry->rcuname, __entry->callbacks_invoked,
		  __entry->cb ? 'C' : '.',
		  __entry->nr ? 'S' : '.',
		  __entry->iit ? 'I' : '.',
		  __entry->risk ? 'R' : '.')
);

/*
 * Tracepoint for rcutorture readers.  The first argument is the name
 * of the RCU flavor from rcutorture's viewpoint and the second argument
 * is the callback address.
 */
TRACE_EVENT(rcu_torture_read,

	TP_PROTO(char *rcutorturename, struct rcu_head *rhp),

	TP_ARGS(rcutorturename, rhp),

	TP_STRUCT__entry(
		__field(char *, rcutorturename)
		__field(struct rcu_head *, rhp)
	),

	TP_fast_assign(
		__entry->rcutorturename = rcutorturename;
		__entry->rhp = rhp;
	),

	TP_printk("%s torture read %p",
		  __entry->rcutorturename, __entry->rhp)
);

#else /* #ifdef CONFIG_RCU_TRACE */

#define trace_rcu_grace_period(rcuname, gpnum, gpevent) do { } while (0)
#define trace_rcu_grace_period_init(rcuname, gpnum, level, grplo, grphi, \
				    qsmask) do { } while (0)
#define trace_rcu_preempt_task(rcuname, pid, gpnum) do { } while (0)
#define trace_rcu_unlock_preempted_task(rcuname, gpnum, pid) do { } while (0)
#define trace_rcu_quiescent_state_report(rcuname, gpnum, mask, qsmask, level, \
					 grplo, grphi, gp_tasks) do { } \
	while (0)
#define trace_rcu_fqs(rcuname, gpnum, cpu, qsevent) do { } while (0)
#define trace_rcu_dyntick(polarity, oldnesting, newnesting) do { } while (0)
#define trace_rcu_prep_idle(reason) do { } while (0)
#define trace_rcu_callback(rcuname, rhp, qlen_lazy, qlen) do { } while (0)
#define trace_rcu_kfree_callback(rcuname, rhp, offset, qlen_lazy, qlen) \
	do { } while (0)
#define trace_rcu_batch_start(rcuname, qlen_lazy, qlen, blimit) \
	do { } while (0)
#define trace_rcu_invoke_callback(rcuname, rhp) do { } while (0)
#define trace_rcu_invoke_kfree_callback(rcuname, rhp, offset) do { } while (0)
#define trace_rcu_batch_end(rcuname, callbacks_invoked, cb, nr, iit, risk) \
	do { } while (0)
#define trace_rcu_torture_read(rcutorturename, rhp) do { } while (0)

#endif /* #else #ifdef CONFIG_RCU_TRACE */

#endif /* _TRACE_RCU_H */

/* This part must be outside protection */
#include <trace/define_trace.h>