include/trace/events/rcu.h

   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 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)
  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 accelerates 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(long, gp_seq)
  78                 __field(const char *, gpevent)
  79         ),
  80
  81         TP_fast_assign(
  82                 __entry->rcuname = rcuname;
  83                 __entry->gp_seq = (long)gp_seq;
  84                 __entry->gpevent = gpevent;
  85         ),
  86
  87         TP_printk("%s %ld %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  * "Cleanup": Clean up rcu_node structure after previous GP.
  97  * "CleanupMore": Clean up, and another GP is needed.
  98  * "EndWait": Complete wait.
  99  * "NoGPkthread": The RCU grace-period kthread has not yet started.
 100  * "Prestarted": Someone beat us to the request
 101  * "Startedleaf": Leaf node marked for future GP.
 102  * "Startedleafroot": All nodes from leaf to root marked for future GP.
 103  * "Startedroot": Requested a nocb grace period based on root-node data.
 104  * "Startleaf": Request a grace period based on leaf-node data.
 105  * "StartWait": Start waiting for the requested grace period.
 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(long, gp_seq)
 118                 __field(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 = (long)gp_seq;
 128                 __entry->gp_seq_req = (long)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 %ld %ld %u %d %d %s",
 136                   __entry->rcuname, (long)__entry->gp_seq, (long)__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(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 = (long)gp_seq;
 166                 __entry->level = level;
 167                 __entry->grplo = grplo;
 168                 __entry->grphi = grphi;
 169                 __entry->qsmask = qsmask;
 170         ),
 171
 172         TP_printk("%s %ld %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(long, gpseq)
 201                 __field(const char *, gpevent)
 202         ),
 203
 204         TP_fast_assign(
 205                 __entry->rcuname = rcuname;
 206                 __entry->gpseq = (long)gpseq;
 207                 __entry->gpevent = gpevent;
 208         ),
 209
 210         TP_printk("%s %ld %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  * "AlreadyAwake": The to-be-awakened rcuo kthread is already awake.
 262  * "Bypass": rcuo GP kthread sees non-empty ->nocb_bypass.
 263  * "CBSleep": rcuo CB kthread sleeping waiting for CBs.
 264  * "Check": rcuo GP kthread checking specified CPU for work.
 265  * "DeferredWake": Timer expired or polled check, time to wake.
 266  * "DoWake": The to-be-awakened rcuo kthread needs to be awakened.
 267  * "EndSleep": Done waiting for GP for !rcu_nocb_poll.
 268  * "FirstBQ": New CB to empty ->nocb_bypass (->cblist maybe non-empty).
 269  * "FirstBQnoWake": FirstBQ plus rcuo kthread need not be awakened.
 270  * "FirstBQwake": FirstBQ plus rcuo kthread must be awakened.
 271  * "FirstQ": New CB to empty ->cblist (->nocb_bypass maybe non-empty).
 272  * "NeedWaitGP": rcuo GP kthread must wait on a grace period.
 273  * "Poll": Start of new polling cycle for rcu_nocb_poll.
 274  * "Sleep": Sleep waiting for GP for !rcu_nocb_poll.
 275  * "Timer": Deferred-wake timer expired.
 276  * "WakeEmptyIsDeferred": Wake rcuo kthread later, first CB to empty list.
 277  * "WakeEmpty": Wake rcuo kthread, first CB to empty list.
 278  * "WakeNot": Don't wake rcuo kthread.
 279  * "WakeNotPoll": Don't wake rcuo kthread because it is polling.
 280  * "WakeOvfIsDeferred": Wake rcuo kthread later, CB list is huge.
 281  * "WakeBypassIsDeferred": Wake rcuo kthread later, bypass list is contended.
 282  * "WokeEmpty": rcuo CB kthread woke to find empty list.
 283  */
 284 TRACE_EVENT_RCU(rcu_nocb_wake,
 285
 286         TP_PROTO(const char *rcuname, int cpu, const char *reason),
 287
 288         TP_ARGS(rcuname, cpu, reason),
 289
 290         TP_STRUCT__entry(
 291                 __field(const char *, rcuname)
 292                 __field(int, cpu)
 293                 __field(const char *, reason)
 294         ),
 295
 296         TP_fast_assign(
 297                 __entry->rcuname = rcuname;
 298                 __entry->cpu = cpu;
 299                 __entry->reason = reason;
 300         ),
 301
 302         TP_printk("%s %d %s", __entry->rcuname, __entry->cpu, __entry->reason)
 303 );
 304 #endif
 305
 306 /*
 307  * Tracepoint for tasks blocking within preemptible-RCU read-side
 308  * critical sections.  Track the type of RCU (which one day might
 309  * include SRCU), the grace-period number that the task is blocking
 310  * (the current or the next), and the task's PID.
 311  */
 312 TRACE_EVENT_RCU(rcu_preempt_task,
 313
 314         TP_PROTO(const char *rcuname, int pid, unsigned long gp_seq),
 315
 316         TP_ARGS(rcuname, pid, gp_seq),
 317
 318         TP_STRUCT__entry(
 319                 __field(const char *, rcuname)
 320                 __field(long, gp_seq)
 321                 __field(int, pid)
 322         ),
 323
 324         TP_fast_assign(
 325                 __entry->rcuname = rcuname;
 326                 __entry->gp_seq = (long)gp_seq;
 327                 __entry->pid = pid;
 328         ),
 329
 330         TP_printk("%s %ld %d",
 331                   __entry->rcuname, __entry->gp_seq, __entry->pid)
 332 );
 333
 334 /*
 335  * Tracepoint for tasks that blocked within a given preemptible-RCU
 336  * read-side critical section exiting that critical section.  Track the
 337  * type of RCU (which one day might include SRCU) and the task's PID.
 338  */
 339 TRACE_EVENT_RCU(rcu_unlock_preempted_task,
 340
 341         TP_PROTO(const char *rcuname, unsigned long gp_seq, int pid),
 342
 343         TP_ARGS(rcuname, gp_seq, pid),
 344
 345         TP_STRUCT__entry(
 346                 __field(const char *, rcuname)
 347                 __field(long, gp_seq)
 348                 __field(int, pid)
 349         ),
 350
 351         TP_fast_assign(
 352                 __entry->rcuname = rcuname;
 353                 __entry->gp_seq = (long)gp_seq;
 354                 __entry->pid = pid;
 355         ),
 356
 357         TP_printk("%s %ld %d", __entry->rcuname, __entry->gp_seq, __entry->pid)
 358 );
 359
 360 /*
 361  * Tracepoint for quiescent-state-reporting events.  These are
 362  * distinguished by the type of RCU, the grace-period number, the
 363  * mask of quiescent lower-level entities, the rcu_node structure level,
 364  * the starting and ending CPU covered by the rcu_node structure, and
 365  * whether there are any blocked tasks blocking the current grace period.
 366  * All but the type of RCU are extracted from the rcu_node structure.
 367  */
 368 TRACE_EVENT_RCU(rcu_quiescent_state_report,
 369
 370         TP_PROTO(const char *rcuname, unsigned long gp_seq,
 371                  unsigned long mask, unsigned long qsmask,
 372                  u8 level, int grplo, int grphi, int gp_tasks),
 373
 374         TP_ARGS(rcuname, gp_seq, mask, qsmask, level, grplo, grphi, gp_tasks),
 375
 376         TP_STRUCT__entry(
 377                 __field(const char *, rcuname)
 378                 __field(long, gp_seq)
 379                 __field(unsigned long, mask)
 380                 __field(unsigned long, qsmask)
 381                 __field(u8, level)
 382                 __field(int, grplo)
 383                 __field(int, grphi)
 384                 __field(u8, gp_tasks)
 385         ),
 386
 387         TP_fast_assign(
 388                 __entry->rcuname = rcuname;
 389                 __entry->gp_seq = (long)gp_seq;
 390                 __entry->mask = mask;
 391                 __entry->qsmask = qsmask;
 392                 __entry->level = level;
 393                 __entry->grplo = grplo;
 394                 __entry->grphi = grphi;
 395                 __entry->gp_tasks = gp_tasks;
 396         ),
 397
 398         TP_printk("%s %ld %lx>%lx %u %d %d %u",
 399                   __entry->rcuname, __entry->gp_seq,
 400                   __entry->mask, __entry->qsmask, __entry->level,
 401                   __entry->grplo, __entry->grphi, __entry->gp_tasks)
 402 );
 403
 404 /*
 405  * Tracepoint for quiescent states detected by force_quiescent_state().
 406  * These trace events include the type of RCU, the grace-period number
 407  * that was blocked by the CPU, the CPU itself, and the type of quiescent
 408  * state, which can be "dti" for dyntick-idle mode or "kick" when kicking
 409  * a CPU that has been in dyntick-idle mode for too long.
 410  */
 411 TRACE_EVENT_RCU(rcu_fqs,
 412
 413         TP_PROTO(const char *rcuname, unsigned long gp_seq, int cpu, const char *qsevent),
 414
 415         TP_ARGS(rcuname, gp_seq, cpu, qsevent),
 416
 417         TP_STRUCT__entry(
 418                 __field(const char *, rcuname)
 419                 __field(long, gp_seq)
 420                 __field(int, cpu)
 421                 __field(const char *, qsevent)
 422         ),
 423
 424         TP_fast_assign(
 425                 __entry->rcuname = rcuname;
 426                 __entry->gp_seq = (long)gp_seq;
 427                 __entry->cpu = cpu;
 428                 __entry->qsevent = qsevent;
 429         ),
 430
 431         TP_printk("%s %ld %d %s",
 432                   __entry->rcuname, __entry->gp_seq,
 433                   __entry->cpu, __entry->qsevent)
 434 );
 435
 436 /*
 437  * Tracepoint for RCU stall events. Takes a string identifying the RCU flavor
 438  * and a string identifying which function detected the RCU stall as follows:
 439  *
 440  *      "StallDetected": Scheduler-tick detects other CPU's stalls.
 441  *      "SelfDetected": Scheduler-tick detects a current CPU's stall.
 442  *      "ExpeditedStall": Expedited grace period detects stalls.
 443  */
 444 TRACE_EVENT(rcu_stall_warning,
 445
 446         TP_PROTO(const char *rcuname, const char *msg),
 447
 448         TP_ARGS(rcuname, msg),
 449
 450         TP_STRUCT__entry(
 451                 __field(const char *, rcuname)
 452                 __field(const char *, msg)
 453         ),
 454
 455         TP_fast_assign(
 456                 __entry->rcuname = rcuname;
 457                 __entry->msg = msg;
 458         ),
 459
 460         TP_printk("%s %s",
 461                   __entry->rcuname, __entry->msg)
 462 );
 463
 464 #endif /* #if defined(CONFIG_TREE_RCU) */
 465
 466 /*
 467  * Tracepoint for dyntick-idle entry/exit events.  These take 2 strings
 468  * as argument:
 469  * polarity: "Start", "End", "StillNonIdle" for entering, exiting or still not
 470  *            being in dyntick-idle mode.
 471  * context: "USER" or "IDLE" or "IRQ".
 472  * NMIs nested in IRQs are inferred with dynticks_nesting > 1 in IRQ context.
 473  *
 474  * These events also take a pair of numbers, which indicate the nesting
 475  * depth before and after the event of interest, and a third number that is
 476  * the ->dynticks counter.  Note that task-related and interrupt-related
 477  * events use two separate counters, and that the "++=" and "--=" events
 478  * for irq/NMI will change the counter by two, otherwise by one.
 479  */
 480 TRACE_EVENT_RCU(rcu_dyntick,
 481
 482         TP_PROTO(const char *polarity, long oldnesting, long newnesting, int dynticks),
 483
 484         TP_ARGS(polarity, oldnesting, newnesting, dynticks),
 485
 486         TP_STRUCT__entry(
 487                 __field(const char *, polarity)
 488                 __field(long, oldnesting)
 489                 __field(long, newnesting)
 490                 __field(int, dynticks)
 491         ),
 492
 493         TP_fast_assign(
 494                 __entry->polarity = polarity;
 495                 __entry->oldnesting = oldnesting;
 496                 __entry->newnesting = newnesting;
 497                 __entry->dynticks = dynticks;
 498         ),
 499
 500         TP_printk("%s %lx %lx %#3x", __entry->polarity,
 501                   __entry->oldnesting, __entry->newnesting,
 502                   __entry->dynticks & 0xfff)
 503 );
 504
 505 /*
 506  * Tracepoint for the registration of a single RCU callback function.
 507  * The first argument is the type of RCU, the second argument is
 508  * a pointer to the RCU callback itself, the third element is the
 509  * number of lazy callbacks queued, and the fourth element is the
 510  * total number of callbacks queued.
 511  */
 512 TRACE_EVENT_RCU(rcu_callback,
 513
 514         TP_PROTO(const char *rcuname, struct rcu_head *rhp, long qlen),
 515
 516         TP_ARGS(rcuname, rhp, qlen),
 517
 518         TP_STRUCT__entry(
 519                 __field(const char *, rcuname)
 520                 __field(void *, rhp)
 521                 __field(void *, func)
 522                 __field(long, qlen)
 523         ),
 524
 525         TP_fast_assign(
 526                 __entry->rcuname = rcuname;
 527                 __entry->rhp = rhp;
 528                 __entry->func = rhp->func;
 529                 __entry->qlen = qlen;
 530         ),
 531
 532         TP_printk("%s rhp=%p func=%ps %ld",
 533                   __entry->rcuname, __entry->rhp, __entry->func,
 534                   __entry->qlen)
 535 );
 536
 537 TRACE_EVENT_RCU(rcu_segcb_stats,
 538
 539                 TP_PROTO(struct rcu_segcblist *rs, const char *ctx),
 540
 541                 TP_ARGS(rs, ctx),
 542
 543                 TP_STRUCT__entry(
 544                         __field(const char *, ctx)
 545                         __array(unsigned long, gp_seq, RCU_CBLIST_NSEGS)
 546                         __array(long, seglen, RCU_CBLIST_NSEGS)
 547                 ),
 548
 549                 TP_fast_assign(
 550                         __entry->ctx = ctx;
 551                         memcpy(__entry->seglen, rs->seglen, RCU_CBLIST_NSEGS * sizeof(long));
 552                         memcpy(__entry->gp_seq, rs->gp_seq, RCU_CBLIST_NSEGS * sizeof(unsigned long));
 553
 554                 ),
 555
 556                 TP_printk("%s seglen: (DONE=%ld, WAIT=%ld, NEXT_READY=%ld, NEXT=%ld) "
 557                           "gp_seq: (DONE=%lu, WAIT=%lu, NEXT_READY=%lu, NEXT=%lu)", __entry->ctx,
 558                           __entry->seglen[0], __entry->seglen[1], __entry->seglen[2], __entry->seglen[3],
 559                           __entry->gp_seq[0], __entry->gp_seq[1], __entry->gp_seq[2], __entry->gp_seq[3])
 560
 561 );
 562
 563 /*
 564  * Tracepoint for the registration of a single RCU callback of the special
 565  * kvfree() form.  The first argument is the RCU type, the second argument
 566  * is a pointer to the RCU callback, the third argument is the offset
 567  * of the callback within the enclosing RCU-protected data structure,
 568  * the fourth argument is the number of lazy callbacks queued, and the
 569  * fifth argument is the total number of callbacks queued.
 570  */
 571 TRACE_EVENT_RCU(rcu_kvfree_callback,
 572
 573         TP_PROTO(const char *rcuname, struct rcu_head *rhp, unsigned long offset,
 574                  long qlen),
 575
 576         TP_ARGS(rcuname, rhp, offset, qlen),
 577
 578         TP_STRUCT__entry(
 579                 __field(const char *, rcuname)
 580                 __field(void *, rhp)
 581                 __field(unsigned long, offset)
 582                 __field(long, qlen)
 583         ),
 584
 585         TP_fast_assign(
 586                 __entry->rcuname = rcuname;
 587                 __entry->rhp = rhp;
 588                 __entry->offset = offset;
 589                 __entry->qlen = qlen;
 590         ),
 591
 592         TP_printk("%s rhp=%p func=%ld %ld",
 593                   __entry->rcuname, __entry->rhp, __entry->offset,
 594                   __entry->qlen)
 595 );
 596
 597 /*
 598  * Tracepoint for marking the beginning rcu_do_batch, performed to start
 599  * RCU callback invocation.  The first argument is the RCU flavor,
 600  * the second is the number of lazy callbacks queued, the third is
 601  * the total number of callbacks queued, and the fourth argument is
 602  * the current RCU-callback batch limit.
 603  */
 604 TRACE_EVENT_RCU(rcu_batch_start,
 605
 606         TP_PROTO(const char *rcuname, long qlen, long blimit),
 607
 608         TP_ARGS(rcuname, qlen, blimit),
 609
 610         TP_STRUCT__entry(
 611                 __field(const char *, rcuname)
 612                 __field(long, qlen)
 613                 __field(long, blimit)
 614         ),
 615
 616         TP_fast_assign(
 617                 __entry->rcuname = rcuname;
 618                 __entry->qlen = qlen;
 619                 __entry->blimit = blimit;
 620         ),
 621
 622         TP_printk("%s CBs=%ld bl=%ld",
 623                   __entry->rcuname, __entry->qlen, __entry->blimit)
 624 );
 625
 626 /*
 627  * Tracepoint for the invocation of a single RCU callback function.
 628  * The first argument is the type of RCU, and the second argument is
 629  * a pointer to the RCU callback itself.
 630  */
 631 TRACE_EVENT_RCU(rcu_invoke_callback,
 632
 633         TP_PROTO(const char *rcuname, struct rcu_head *rhp),
 634
 635         TP_ARGS(rcuname, rhp),
 636
 637         TP_STRUCT__entry(
 638                 __field(const char *, rcuname)
 639                 __field(void *, rhp)
 640                 __field(void *, func)
 641         ),
 642
 643         TP_fast_assign(
 644                 __entry->rcuname = rcuname;
 645                 __entry->rhp = rhp;
 646                 __entry->func = rhp->func;
 647         ),
 648
 649         TP_printk("%s rhp=%p func=%ps",
 650                   __entry->rcuname, __entry->rhp, __entry->func)
 651 );
 652
 653 /*
 654  * Tracepoint for the invocation of a single RCU callback of the special
 655  * kvfree() form.  The first argument is the RCU flavor, the second
 656  * argument is a pointer to the RCU callback, and the third argument
 657  * is the offset of the callback within the enclosing RCU-protected
 658  * data structure.
 659  */
 660 TRACE_EVENT_RCU(rcu_invoke_kvfree_callback,
 661
 662         TP_PROTO(const char *rcuname, struct rcu_head *rhp, unsigned long offset),
 663
 664         TP_ARGS(rcuname, rhp, offset),
 665
 666         TP_STRUCT__entry(
 667                 __field(const char *, rcuname)
 668                 __field(void *, rhp)
 669                 __field(unsigned long, offset)
 670         ),
 671
 672         TP_fast_assign(
 673                 __entry->rcuname = rcuname;
 674                 __entry->rhp = rhp;
 675                 __entry->offset = offset;
 676         ),
 677
 678         TP_printk("%s rhp=%p func=%ld",
 679                   __entry->rcuname, __entry->rhp, __entry->offset)
 680 );
 681
 682 /*
 683  * Tracepoint for the invocation of a single RCU callback of the special
 684  * kfree_bulk() form. The first argument is the RCU flavor, the second
 685  * argument is a number of elements in array to free, the third is an
 686  * address of the array holding nr_records entries.
 687  */
 688 TRACE_EVENT_RCU(rcu_invoke_kfree_bulk_callback,
 689
 690         TP_PROTO(const char *rcuname, unsigned long nr_records, void **p),
 691
 692         TP_ARGS(rcuname, nr_records, p),
 693
 694         TP_STRUCT__entry(
 695                 __field(const char *, rcuname)
 696                 __field(unsigned long, nr_records)
 697                 __field(void **, p)
 698         ),
 699
 700         TP_fast_assign(
 701                 __entry->rcuname = rcuname;
 702                 __entry->nr_records = nr_records;
 703                 __entry->p = p;
 704         ),
 705
 706         TP_printk("%s bulk=0x%p nr_records=%lu",
 707                 __entry->rcuname, __entry->p, __entry->nr_records)
 708 );
 709
 710 /*
 711  * Tracepoint for exiting rcu_do_batch after RCU callbacks have been
 712  * invoked.  The first argument is the name of the RCU flavor,
 713  * the second argument is number of callbacks actually invoked,
 714  * the third argument (cb) is whether or not any of the callbacks that
 715  * were ready to invoke at the beginning of this batch are still
 716  * queued, the fourth argument (nr) is the return value of need_resched(),
 717  * the fifth argument (iit) is 1 if the current task is the idle task,
 718  * and the sixth argument (risk) is the return value from
 719  * rcu_is_callbacks_kthread().
 720  */
 721 TRACE_EVENT_RCU(rcu_batch_end,
 722
 723         TP_PROTO(const char *rcuname, int callbacks_invoked,
 724                  char cb, char nr, char iit, char risk),
 725
 726         TP_ARGS(rcuname, callbacks_invoked, cb, nr, iit, risk),
 727
 728         TP_STRUCT__entry(
 729                 __field(const char *, rcuname)
 730                 __field(int, callbacks_invoked)
 731                 __field(char, cb)
 732                 __field(char, nr)
 733                 __field(char, iit)
 734                 __field(char, risk)
 735         ),
 736
 737         TP_fast_assign(
 738                 __entry->rcuname = rcuname;
 739                 __entry->callbacks_invoked = callbacks_invoked;
 740                 __entry->cb = cb;
 741                 __entry->nr = nr;
 742                 __entry->iit = iit;
 743                 __entry->risk = risk;
 744         ),
 745
 746         TP_printk("%s CBs-invoked=%d idle=%c%c%c%c",
 747                   __entry->rcuname, __entry->callbacks_invoked,
 748                   __entry->cb ? 'C' : '.',
 749                   __entry->nr ? 'S' : '.',
 750                   __entry->iit ? 'I' : '.',
 751                   __entry->risk ? 'R' : '.')
 752 );
 753
 754 /*
 755  * Tracepoint for rcutorture readers.  The first argument is the name
 756  * of the RCU flavor from rcutorture's viewpoint and the second argument
 757  * is the callback address.  The third argument is the start time in
 758  * seconds, and the last two arguments are the grace period numbers
 759  * at the beginning and end of the read, respectively.  Note that the
 760  * callback address can be NULL.
 761  */
 762 #define RCUTORTURENAME_LEN 8
 763 TRACE_EVENT_RCU(rcu_torture_read,
 764
 765         TP_PROTO(const char *rcutorturename, struct rcu_head *rhp,
 766                  unsigned long secs, unsigned long c_old, unsigned long c),
 767
 768         TP_ARGS(rcutorturename, rhp, secs, c_old, c),
 769
 770         TP_STRUCT__entry(
 771                 __field(char, rcutorturename[RCUTORTURENAME_LEN])
 772                 __field(struct rcu_head *, rhp)
 773                 __field(unsigned long, secs)
 774                 __field(unsigned long, c_old)
 775                 __field(unsigned long, c)
 776         ),
 777
 778         TP_fast_assign(
 779                 strncpy(__entry->rcutorturename, rcutorturename,
 780                         RCUTORTURENAME_LEN);
 781                 __entry->rcutorturename[RCUTORTURENAME_LEN - 1] = 0;
 782                 __entry->rhp = rhp;
 783                 __entry->secs = secs;
 784                 __entry->c_old = c_old;
 785                 __entry->c = c;
 786         ),
 787
 788         TP_printk("%s torture read %p %luus c: %lu %lu",
 789                   __entry->rcutorturename, __entry->rhp,
 790                   __entry->secs, __entry->c_old, __entry->c)
 791 );
 792
 793 /*
 794  * Tracepoint for rcu_barrier() execution.  The string "s" describes
 795  * the rcu_barrier phase:
 796  *      "Begin": rcu_barrier() started.
 797  *      "EarlyExit": rcu_barrier() piggybacked, thus early exit.
 798  *      "Inc1": rcu_barrier() piggyback check counter incremented.
 799  *      "OfflineNoCBQ": rcu_barrier() found offline no-CBs CPU with callbacks.
 800  *      "OnlineQ": rcu_barrier() found online CPU with callbacks.
 801  *      "OnlineNQ": rcu_barrier() found online CPU, no callbacks.
 802  *      "IRQ": An rcu_barrier_callback() callback posted on remote CPU.
 803  *      "IRQNQ": An rcu_barrier_callback() callback found no callbacks.
 804  *      "CB": An rcu_barrier_callback() invoked a callback, not the last.
 805  *      "LastCB": An rcu_barrier_callback() invoked the last callback.
 806  *      "Inc2": rcu_barrier() piggyback check counter incremented.
 807  * The "cpu" argument is the CPU or -1 if meaningless, the "cnt" argument
 808  * is the count of remaining callbacks, and "done" is the piggybacking count.
 809  */
 810 TRACE_EVENT_RCU(rcu_barrier,
 811
 812         TP_PROTO(const char *rcuname, const char *s, int cpu, int cnt, unsigned long done),
 813
 814         TP_ARGS(rcuname, s, cpu, cnt, done),
 815
 816         TP_STRUCT__entry(
 817                 __field(const char *, rcuname)
 818                 __field(const char *, s)
 819                 __field(int, cpu)
 820                 __field(int, cnt)
 821                 __field(unsigned long, done)
 822         ),
 823
 824         TP_fast_assign(
 825                 __entry->rcuname = rcuname;
 826                 __entry->s = s;
 827                 __entry->cpu = cpu;
 828                 __entry->cnt = cnt;
 829                 __entry->done = done;
 830         ),
 831
 832         TP_printk("%s %s cpu %d remaining %d # %lu",
 833                   __entry->rcuname, __entry->s, __entry->cpu, __entry->cnt,
 834                   __entry->done)
 835 );
 836
 837 #endif /* _TRACE_RCU_H */
 838
 839 /* This part must be outside protection */
 840 #include <trace/define_trace.h>