Linux Kernel  3.7.1
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rcu.h
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1 #undef TRACE_SYSTEM
2 #define TRACE_SYSTEM rcu
3 
4 #if !defined(_TRACE_RCU_H) || defined(TRACE_HEADER_MULTI_READ)
5 #define _TRACE_RCU_H
6 
7 #include <linux/tracepoint.h>
8 
9 /*
10  * Tracepoint for start/end markers used for utilization calculations.
11  * By convention, the string is of the following forms:
12  *
13  * "Start <activity>" -- Mark the start of the specified activity,
14  * such as "context switch". Nesting is permitted.
15  * "End <activity>" -- Mark the end of the specified activity.
16  *
17  * An "@" character within "<activity>" is a comment character: Data
18  * reduction scripts will ignore the "@" and the remainder of the line.
19  */
20 TRACE_EVENT(rcu_utilization,
21 
22  TP_PROTO(char *s),
23 
24  TP_ARGS(s),
25 
27  __field(char *, s)
28  ),
29 
31  __entry->s = s;
32  ),
33 
34  TP_printk("%s", __entry->s)
35 );
36 
37 #ifdef CONFIG_RCU_TRACE
38 
39 #if defined(CONFIG_TREE_RCU) || defined(CONFIG_TREE_PREEMPT_RCU)
40 
41 /*
42  * Tracepoint for grace-period events: 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), and a CPU being kicked for being too
48  * long in dyntick-idle mode ("kick").
49  */
50 TRACE_EVENT(rcu_grace_period,
51 
52  TP_PROTO(char *rcuname, unsigned long gpnum, char *gpevent),
53 
54  TP_ARGS(rcuname, gpnum, gpevent),
55 
57  __field(char *, rcuname)
58  __field(unsigned long, gpnum)
59  __field(char *, gpevent)
60  ),
61 
63  __entry->rcuname = rcuname;
64  __entry->gpnum = gpnum;
65  __entry->gpevent = gpevent;
66  ),
67 
68  TP_printk("%s %lu %s",
69  __entry->rcuname, __entry->gpnum, __entry->gpevent)
70 );
71 
72 /*
73  * Tracepoint for grace-period-initialization events. These are
74  * distinguished by the type of RCU, the new grace-period number, the
75  * rcu_node structure level, the starting and ending CPU covered by the
76  * rcu_node structure, and the mask of CPUs that will be waited for.
77  * All but the type of RCU are extracted from the rcu_node structure.
78  */
79 TRACE_EVENT(rcu_grace_period_init,
80 
81  TP_PROTO(char *rcuname, unsigned long gpnum, u8 level,
82  int grplo, int grphi, unsigned long qsmask),
83 
84  TP_ARGS(rcuname, gpnum, level, grplo, grphi, qsmask),
85 
87  __field(char *, rcuname)
88  __field(unsigned long, gpnum)
89  __field(u8, level)
90  __field(int, grplo)
91  __field(int, grphi)
92  __field(unsigned long, qsmask)
93  ),
94 
96  __entry->rcuname = rcuname;
97  __entry->gpnum = gpnum;
98  __entry->level = level;
99  __entry->grplo = grplo;
100  __entry->grphi = grphi;
101  __entry->qsmask = qsmask;
102  ),
103 
104  TP_printk("%s %lu %u %d %d %lx",
105  __entry->rcuname, __entry->gpnum, __entry->level,
106  __entry->grplo, __entry->grphi, __entry->qsmask)
107 );
108 
109 /*
110  * Tracepoint for tasks blocking within preemptible-RCU read-side
111  * critical sections. Track the type of RCU (which one day might
112  * include SRCU), the grace-period number that the task is blocking
113  * (the current or the next), and the task's PID.
114  */
115 TRACE_EVENT(rcu_preempt_task,
116 
117  TP_PROTO(char *rcuname, int pid, unsigned long gpnum),
118 
119  TP_ARGS(rcuname, pid, gpnum),
120 
122  __field(char *, rcuname)
123  __field(unsigned long, gpnum)
124  __field(int, pid)
125  ),
126 
128  __entry->rcuname = rcuname;
129  __entry->gpnum = gpnum;
130  __entry->pid = pid;
131  ),
132 
133  TP_printk("%s %lu %d",
134  __entry->rcuname, __entry->gpnum, __entry->pid)
135 );
136 
137 /*
138  * Tracepoint for tasks that blocked within a given preemptible-RCU
139  * read-side critical section exiting that critical section. Track the
140  * type of RCU (which one day might include SRCU) and the task's PID.
141  */
142 TRACE_EVENT(rcu_unlock_preempted_task,
143 
144  TP_PROTO(char *rcuname, unsigned long gpnum, int pid),
145 
146  TP_ARGS(rcuname, gpnum, pid),
147 
149  __field(char *, rcuname)
150  __field(unsigned long, gpnum)
151  __field(int, pid)
152  ),
153 
155  __entry->rcuname = rcuname;
156  __entry->gpnum = gpnum;
157  __entry->pid = pid;
158  ),
159 
160  TP_printk("%s %lu %d", __entry->rcuname, __entry->gpnum, __entry->pid)
161 );
162 
163 /*
164  * Tracepoint for quiescent-state-reporting events. These are
165  * distinguished by the type of RCU, the grace-period number, the
166  * mask of quiescent lower-level entities, the rcu_node structure level,
167  * the starting and ending CPU covered by the rcu_node structure, and
168  * whether there are any blocked tasks blocking the current grace period.
169  * All but the type of RCU are extracted from the rcu_node structure.
170  */
171 TRACE_EVENT(rcu_quiescent_state_report,
172 
173  TP_PROTO(char *rcuname, unsigned long gpnum,
174  unsigned long mask, unsigned long qsmask,
175  u8 level, int grplo, int grphi, int gp_tasks),
176 
177  TP_ARGS(rcuname, gpnum, mask, qsmask, level, grplo, grphi, gp_tasks),
178 
180  __field(char *, rcuname)
181  __field(unsigned long, gpnum)
182  __field(unsigned long, mask)
183  __field(unsigned long, qsmask)
184  __field(u8, level)
185  __field(int, grplo)
186  __field(int, grphi)
187  __field(u8, gp_tasks)
188  ),
189 
191  __entry->rcuname = rcuname;
192  __entry->gpnum = gpnum;
193  __entry->mask = mask;
194  __entry->qsmask = qsmask;
195  __entry->level = level;
196  __entry->grplo = grplo;
197  __entry->grphi = grphi;
198  __entry->gp_tasks = gp_tasks;
199  ),
200 
201  TP_printk("%s %lu %lx>%lx %u %d %d %u",
202  __entry->rcuname, __entry->gpnum,
203  __entry->mask, __entry->qsmask, __entry->level,
204  __entry->grplo, __entry->grphi, __entry->gp_tasks)
205 );
206 
207 /*
208  * Tracepoint for quiescent states detected by force_quiescent_state().
209  * These trace events include the type of RCU, the grace-period number
210  * that was blocked by the CPU, the CPU itself, and the type of quiescent
211  * state, which can be "dti" for dyntick-idle mode, "ofl" for CPU offline,
212  * or "kick" when kicking a CPU that has been in dyntick-idle mode for
213  * too long.
214  */
215 TRACE_EVENT(rcu_fqs,
216 
217  TP_PROTO(char *rcuname, unsigned long gpnum, int cpu, char *qsevent),
218 
219  TP_ARGS(rcuname, gpnum, cpu, qsevent),
220 
222  __field(char *, rcuname)
223  __field(unsigned long, gpnum)
224  __field(int, cpu)
225  __field(char *, qsevent)
226  ),
227 
229  __entry->rcuname = rcuname;
230  __entry->gpnum = gpnum;
231  __entry->cpu = cpu;
232  __entry->qsevent = qsevent;
233  ),
234 
235  TP_printk("%s %lu %d %s",
236  __entry->rcuname, __entry->gpnum,
237  __entry->cpu, __entry->qsevent)
238 );
239 
240 #endif /* #if defined(CONFIG_TREE_RCU) || defined(CONFIG_TREE_PREEMPT_RCU) */
241 
242 /*
243  * Tracepoint for dyntick-idle entry/exit events. These take a string
244  * as argument: "Start" for entering dyntick-idle mode, "End" for
245  * leaving it, "--=" for events moving towards idle, and "++=" for events
246  * moving away from idle. "Error on entry: not idle task" and "Error on
247  * exit: not idle task" indicate that a non-idle task is erroneously
248  * toying with the idle loop.
249  *
250  * These events also take a pair of numbers, which indicate the nesting
251  * depth before and after the event of interest. Note that task-related
252  * events use the upper bits of each number, while interrupt-related
253  * events use the lower bits.
254  */
255 TRACE_EVENT(rcu_dyntick,
256 
257  TP_PROTO(char *polarity, long long oldnesting, long long newnesting),
258 
259  TP_ARGS(polarity, oldnesting, newnesting),
260 
262  __field(char *, polarity)
263  __field(long long, oldnesting)
264  __field(long long, newnesting)
265  ),
266 
268  __entry->polarity = polarity;
269  __entry->oldnesting = oldnesting;
270  __entry->newnesting = newnesting;
271  ),
272 
273  TP_printk("%s %llx %llx", __entry->polarity,
274  __entry->oldnesting, __entry->newnesting)
275 );
276 
277 /*
278  * Tracepoint for RCU preparation for idle, the goal being to get RCU
279  * processing done so that the current CPU can shut off its scheduling
280  * clock and enter dyntick-idle mode. One way to accomplish this is
281  * to drain all RCU callbacks from this CPU, and the other is to have
282  * done everything RCU requires for the current grace period. In this
283  * latter case, the CPU will be awakened at the end of the current grace
284  * period in order to process the remainder of its callbacks.
285  *
286  * These tracepoints take a string as argument:
287  *
288  * "No callbacks": Nothing to do, no callbacks on this CPU.
289  * "In holdoff": Nothing to do, holding off after unsuccessful attempt.
290  * "Begin holdoff": Attempt failed, don't retry until next jiffy.
291  * "Dyntick with callbacks": Entering dyntick-idle despite callbacks.
292  * "Dyntick with lazy callbacks": Entering dyntick-idle w/lazy callbacks.
293  * "More callbacks": Still more callbacks, try again to clear them out.
294  * "Callbacks drained": All callbacks processed, off to dyntick idle!
295  * "Timer": Timer fired to cause CPU to continue processing callbacks.
296  * "Demigrate": Timer fired on wrong CPU, woke up correct CPU.
297  * "Cleanup after idle": Idle exited, timer canceled.
298  */
299 TRACE_EVENT(rcu_prep_idle,
300 
301  TP_PROTO(char *reason),
302 
303  TP_ARGS(reason),
304 
306  __field(char *, reason)
307  ),
308 
310  __entry->reason = reason;
311  ),
312 
313  TP_printk("%s", __entry->reason)
314 );
315 
316 /*
317  * Tracepoint for the registration of a single RCU callback function.
318  * The first argument is the type of RCU, the second argument is
319  * a pointer to the RCU callback itself, the third element is the
320  * number of lazy callbacks queued, and the fourth element is the
321  * total number of callbacks queued.
322  */
323 TRACE_EVENT(rcu_callback,
324 
325  TP_PROTO(char *rcuname, struct rcu_head *rhp, long qlen_lazy,
326  long qlen),
327 
328  TP_ARGS(rcuname, rhp, qlen_lazy, qlen),
329 
331  __field(char *, rcuname)
332  __field(void *, rhp)
333  __field(void *, func)
334  __field(long, qlen_lazy)
335  __field(long, qlen)
336  ),
337 
339  __entry->rcuname = rcuname;
340  __entry->rhp = rhp;
341  __entry->func = rhp->func;
342  __entry->qlen_lazy = qlen_lazy;
343  __entry->qlen = qlen;
344  ),
345 
346  TP_printk("%s rhp=%p func=%pf %ld/%ld",
347  __entry->rcuname, __entry->rhp, __entry->func,
348  __entry->qlen_lazy, __entry->qlen)
349 );
350 
351 /*
352  * Tracepoint for the registration of a single RCU callback of the special
353  * kfree() form. The first argument is the RCU type, the second argument
354  * is a pointer to the RCU callback, the third argument is the offset
355  * of the callback within the enclosing RCU-protected data structure,
356  * the fourth argument is the number of lazy callbacks queued, and the
357  * fifth argument is the total number of callbacks queued.
358  */
359 TRACE_EVENT(rcu_kfree_callback,
360 
361  TP_PROTO(char *rcuname, struct rcu_head *rhp, unsigned long offset,
362  long qlen_lazy, long qlen),
363 
364  TP_ARGS(rcuname, rhp, offset, qlen_lazy, qlen),
365 
367  __field(char *, rcuname)
368  __field(void *, rhp)
369  __field(unsigned long, offset)
370  __field(long, qlen_lazy)
371  __field(long, qlen)
372  ),
373 
375  __entry->rcuname = rcuname;
376  __entry->rhp = rhp;
377  __entry->offset = offset;
378  __entry->qlen_lazy = qlen_lazy;
379  __entry->qlen = qlen;
380  ),
381 
382  TP_printk("%s rhp=%p func=%ld %ld/%ld",
383  __entry->rcuname, __entry->rhp, __entry->offset,
384  __entry->qlen_lazy, __entry->qlen)
385 );
386 
387 /*
388  * Tracepoint for marking the beginning rcu_do_batch, performed to start
389  * RCU callback invocation. The first argument is the RCU flavor,
390  * the second is the number of lazy callbacks queued, the third is
391  * the total number of callbacks queued, and the fourth argument is
392  * the current RCU-callback batch limit.
393  */
394 TRACE_EVENT(rcu_batch_start,
395 
396  TP_PROTO(char *rcuname, long qlen_lazy, long qlen, int blimit),
397 
398  TP_ARGS(rcuname, qlen_lazy, qlen, blimit),
399 
401  __field(char *, rcuname)
402  __field(long, qlen_lazy)
403  __field(long, qlen)
404  __field(int, blimit)
405  ),
406 
408  __entry->rcuname = rcuname;
409  __entry->qlen_lazy = qlen_lazy;
410  __entry->qlen = qlen;
411  __entry->blimit = blimit;
412  ),
413 
414  TP_printk("%s CBs=%ld/%ld bl=%d",
415  __entry->rcuname, __entry->qlen_lazy, __entry->qlen,
416  __entry->blimit)
417 );
418 
419 /*
420  * Tracepoint for the invocation of a single RCU callback function.
421  * The first argument is the type of RCU, and the second argument is
422  * a pointer to the RCU callback itself.
423  */
424 TRACE_EVENT(rcu_invoke_callback,
425 
426  TP_PROTO(char *rcuname, struct rcu_head *rhp),
427 
428  TP_ARGS(rcuname, rhp),
429 
431  __field(char *, rcuname)
432  __field(void *, rhp)
433  __field(void *, func)
434  ),
435 
437  __entry->rcuname = rcuname;
438  __entry->rhp = rhp;
439  __entry->func = rhp->func;
440  ),
441 
442  TP_printk("%s rhp=%p func=%pf",
443  __entry->rcuname, __entry->rhp, __entry->func)
444 );
445 
446 /*
447  * Tracepoint for the invocation of a single RCU callback of the special
448  * kfree() form. The first argument is the RCU flavor, the second
449  * argument is a pointer to the RCU callback, and the third argument
450  * is the offset of the callback within the enclosing RCU-protected
451  * data structure.
452  */
453 TRACE_EVENT(rcu_invoke_kfree_callback,
454 
455  TP_PROTO(char *rcuname, struct rcu_head *rhp, unsigned long offset),
456 
457  TP_ARGS(rcuname, rhp, offset),
458 
460  __field(char *, rcuname)
461  __field(void *, rhp)
462  __field(unsigned long, offset)
463  ),
464 
466  __entry->rcuname = rcuname;
467  __entry->rhp = rhp;
468  __entry->offset = offset;
469  ),
470 
471  TP_printk("%s rhp=%p func=%ld",
472  __entry->rcuname, __entry->rhp, __entry->offset)
473 );
474 
475 /*
476  * Tracepoint for exiting rcu_do_batch after RCU callbacks have been
477  * invoked. The first argument is the name of the RCU flavor,
478  * the second argument is number of callbacks actually invoked,
479  * the third argument (cb) is whether or not any of the callbacks that
480  * were ready to invoke at the beginning of this batch are still
481  * queued, the fourth argument (nr) is the return value of need_resched(),
482  * the fifth argument (iit) is 1 if the current task is the idle task,
483  * and the sixth argument (risk) is the return value from
484  * rcu_is_callbacks_kthread().
485  */
486 TRACE_EVENT(rcu_batch_end,
487 
488  TP_PROTO(char *rcuname, int callbacks_invoked,
489  bool cb, bool nr, bool iit, bool risk),
490 
491  TP_ARGS(rcuname, callbacks_invoked, cb, nr, iit, risk),
492 
494  __field(char *, rcuname)
495  __field(int, callbacks_invoked)
496  __field(bool, cb)
497  __field(bool, nr)
498  __field(bool, iit)
499  __field(bool, risk)
500  ),
501 
503  __entry->rcuname = rcuname;
504  __entry->callbacks_invoked = callbacks_invoked;
505  __entry->cb = cb;
506  __entry->nr = nr;
507  __entry->iit = iit;
508  __entry->risk = risk;
509  ),
510 
511  TP_printk("%s CBs-invoked=%d idle=%c%c%c%c",
512  __entry->rcuname, __entry->callbacks_invoked,
513  __entry->cb ? 'C' : '.',
514  __entry->nr ? 'S' : '.',
515  __entry->iit ? 'I' : '.',
516  __entry->risk ? 'R' : '.')
517 );
518 
519 /*
520  * Tracepoint for rcutorture readers. The first argument is the name
521  * of the RCU flavor from rcutorture's viewpoint and the second argument
522  * is the callback address.
523  */
524 TRACE_EVENT(rcu_torture_read,
525 
526  TP_PROTO(char *rcutorturename, struct rcu_head *rhp),
527 
528  TP_ARGS(rcutorturename, rhp),
529 
531  __field(char *, rcutorturename)
532  __field(struct rcu_head *, rhp)
533  ),
534 
536  __entry->rcutorturename = rcutorturename;
537  __entry->rhp = rhp;
538  ),
539 
540  TP_printk("%s torture read %p",
541  __entry->rcutorturename, __entry->rhp)
542 );
543 
544 /*
545  * Tracepoint for _rcu_barrier() execution. The string "s" describes
546  * the _rcu_barrier phase:
547  * "Begin": rcu_barrier_callback() started.
548  * "Check": rcu_barrier_callback() checking for piggybacking.
549  * "EarlyExit": rcu_barrier_callback() piggybacked, thus early exit.
550  * "Inc1": rcu_barrier_callback() piggyback check counter incremented.
551  * "Offline": rcu_barrier_callback() found offline CPU
552  * "OnlineQ": rcu_barrier_callback() found online CPU with callbacks.
553  * "OnlineNQ": rcu_barrier_callback() found online CPU, no callbacks.
554  * "IRQ": An rcu_barrier_callback() callback posted on remote CPU.
555  * "CB": An rcu_barrier_callback() invoked a callback, not the last.
556  * "LastCB": An rcu_barrier_callback() invoked the last callback.
557  * "Inc2": rcu_barrier_callback() piggyback check counter incremented.
558  * The "cpu" argument is the CPU or -1 if meaningless, the "cnt" argument
559  * is the count of remaining callbacks, and "done" is the piggybacking count.
560  */
561 TRACE_EVENT(rcu_barrier,
562 
563  TP_PROTO(char *rcuname, char *s, int cpu, int cnt, unsigned long done),
564 
565  TP_ARGS(rcuname, s, cpu, cnt, done),
566 
568  __field(char *, rcuname)
569  __field(char *, s)
570  __field(int, cpu)
571  __field(int, cnt)
572  __field(unsigned long, done)
573  ),
574 
576  __entry->rcuname = rcuname;
577  __entry->s = s;
578  __entry->cpu = cpu;
579  __entry->cnt = cnt;
580  __entry->done = done;
581  ),
582 
583  TP_printk("%s %s cpu %d remaining %d # %lu",
584  __entry->rcuname, __entry->s, __entry->cpu, __entry->cnt,
585  __entry->done)
586 );
587 
588 #else /* #ifdef CONFIG_RCU_TRACE */
589 
590 #define trace_rcu_grace_period(rcuname, gpnum, gpevent) do { } while (0)
591 #define trace_rcu_grace_period_init(rcuname, gpnum, level, grplo, grphi, \
592  qsmask) do { } while (0)
593 #define trace_rcu_preempt_task(rcuname, pid, gpnum) do { } while (0)
594 #define trace_rcu_unlock_preempted_task(rcuname, gpnum, pid) do { } while (0)
595 #define trace_rcu_quiescent_state_report(rcuname, gpnum, mask, qsmask, level, \
596  grplo, grphi, gp_tasks) do { } \
597  while (0)
598 #define trace_rcu_fqs(rcuname, gpnum, cpu, qsevent) do { } while (0)
599 #define trace_rcu_dyntick(polarity, oldnesting, newnesting) do { } while (0)
600 #define trace_rcu_prep_idle(reason) do { } while (0)
601 #define trace_rcu_callback(rcuname, rhp, qlen_lazy, qlen) do { } while (0)
602 #define trace_rcu_kfree_callback(rcuname, rhp, offset, qlen_lazy, qlen) \
603  do { } while (0)
604 #define trace_rcu_batch_start(rcuname, qlen_lazy, qlen, blimit) \
605  do { } while (0)
606 #define trace_rcu_invoke_callback(rcuname, rhp) do { } while (0)
607 #define trace_rcu_invoke_kfree_callback(rcuname, rhp, offset) do { } while (0)
608 #define trace_rcu_batch_end(rcuname, callbacks_invoked, cb, nr, iit, risk) \
609  do { } while (0)
610 #define trace_rcu_torture_read(rcutorturename, rhp) do { } while (0)
611 #define trace_rcu_barrier(name, s, cpu, cnt, done) do { } while (0)
612 
613 #endif /* #else #ifdef CONFIG_RCU_TRACE */
614 
615 #endif /* _TRACE_RCU_H */
616 
617 /* This part must be outside protection */
618 #include <trace/define_trace.h>