1 /* 2 * trace task wakeup timings 3 * 4 * Copyright (C) 2007-2008 Steven Rostedt <srostedt@redhat.com> 5 * Copyright (C) 2008 Ingo Molnar <mingo@redhat.com> 6 * 7 * Based on code from the latency_tracer, that is: 8 * 9 * Copyright (C) 2004-2006 Ingo Molnar 10 * Copyright (C) 2004 Nadia Yvette Chambers 11 */ 12 #include <linux/module.h> 13 #include <linux/kallsyms.h> 14 #include <linux/uaccess.h> 15 #include <linux/ftrace.h> 16 #include <linux/sched/rt.h> 17 #include <linux/sched/deadline.h> 18 #include <trace/events/sched.h> 19 #include "trace.h" 20 21 static struct trace_array *wakeup_trace; 22 static int __read_mostly tracer_enabled; 23 24 static struct task_struct *wakeup_task; 25 static int wakeup_cpu; 26 static int wakeup_current_cpu; 27 static unsigned wakeup_prio = -1; 28 static int wakeup_rt; 29 static int wakeup_dl; 30 static int tracing_dl = 0; 31 32 static arch_spinlock_t wakeup_lock = 33 (arch_spinlock_t)__ARCH_SPIN_LOCK_UNLOCKED; 34 35 static void wakeup_reset(struct trace_array *tr); 36 static void __wakeup_reset(struct trace_array *tr); 37 38 static int save_flags; 39 40 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 41 static int wakeup_display_graph(struct trace_array *tr, int set); 42 # define is_graph(tr) ((tr)->trace_flags & TRACE_ITER_DISPLAY_GRAPH) 43 #else 44 static inline int wakeup_display_graph(struct trace_array *tr, int set) 45 { 46 return 0; 47 } 48 # define is_graph(tr) false 49 #endif 50 51 52 #ifdef CONFIG_FUNCTION_TRACER 53 54 static int wakeup_graph_entry(struct ftrace_graph_ent *trace); 55 static void wakeup_graph_return(struct ftrace_graph_ret *trace); 56 57 static bool function_enabled; 58 59 /* 60 * Prologue for the wakeup function tracers. 61 * 62 * Returns 1 if it is OK to continue, and preemption 63 * is disabled and data->disabled is incremented. 64 * 0 if the trace is to be ignored, and preemption 65 * is not disabled and data->disabled is 66 * kept the same. 67 * 68 * Note, this function is also used outside this ifdef but 69 * inside the #ifdef of the function graph tracer below. 70 * This is OK, since the function graph tracer is 71 * dependent on the function tracer. 72 */ 73 static int 74 func_prolog_preempt_disable(struct trace_array *tr, 75 struct trace_array_cpu **data, 76 int *pc) 77 { 78 long disabled; 79 int cpu; 80 81 if (likely(!wakeup_task)) 82 return 0; 83 84 *pc = preempt_count(); 85 preempt_disable_notrace(); 86 87 cpu = raw_smp_processor_id(); 88 if (cpu != wakeup_current_cpu) 89 goto out_enable; 90 91 *data = per_cpu_ptr(tr->trace_buffer.data, cpu); 92 disabled = atomic_inc_return(&(*data)->disabled); 93 if (unlikely(disabled != 1)) 94 goto out; 95 96 return 1; 97 98 out: 99 atomic_dec(&(*data)->disabled); 100 101 out_enable: 102 preempt_enable_notrace(); 103 return 0; 104 } 105 106 /* 107 * wakeup uses its own tracer function to keep the overhead down: 108 */ 109 static void 110 wakeup_tracer_call(unsigned long ip, unsigned long parent_ip, 111 struct ftrace_ops *op, struct pt_regs *pt_regs) 112 { 113 struct trace_array *tr = wakeup_trace; 114 struct trace_array_cpu *data; 115 unsigned long flags; 116 int pc; 117 118 if (!func_prolog_preempt_disable(tr, &data, &pc)) 119 return; 120 121 local_irq_save(flags); 122 trace_function(tr, ip, parent_ip, flags, pc); 123 local_irq_restore(flags); 124 125 atomic_dec(&data->disabled); 126 preempt_enable_notrace(); 127 } 128 129 static int register_wakeup_function(struct trace_array *tr, int graph, int set) 130 { 131 int ret; 132 133 /* 'set' is set if TRACE_ITER_FUNCTION is about to be set */ 134 if (function_enabled || (!set && !(tr->trace_flags & TRACE_ITER_FUNCTION))) 135 return 0; 136 137 if (graph) 138 ret = register_ftrace_graph(&wakeup_graph_return, 139 &wakeup_graph_entry); 140 else 141 ret = register_ftrace_function(tr->ops); 142 143 if (!ret) 144 function_enabled = true; 145 146 return ret; 147 } 148 149 static void unregister_wakeup_function(struct trace_array *tr, int graph) 150 { 151 if (!function_enabled) 152 return; 153 154 if (graph) 155 unregister_ftrace_graph(); 156 else 157 unregister_ftrace_function(tr->ops); 158 159 function_enabled = false; 160 } 161 162 static int wakeup_function_set(struct trace_array *tr, u32 mask, int set) 163 { 164 if (!(mask & TRACE_ITER_FUNCTION)) 165 return 0; 166 167 if (set) 168 register_wakeup_function(tr, is_graph(tr), 1); 169 else 170 unregister_wakeup_function(tr, is_graph(tr)); 171 return 1; 172 } 173 #else 174 static int register_wakeup_function(struct trace_array *tr, int graph, int set) 175 { 176 return 0; 177 } 178 static void unregister_wakeup_function(struct trace_array *tr, int graph) { } 179 static int wakeup_function_set(struct trace_array *tr, u32 mask, int set) 180 { 181 return 0; 182 } 183 #endif /* CONFIG_FUNCTION_TRACER */ 184 185 static int wakeup_flag_changed(struct trace_array *tr, u32 mask, int set) 186 { 187 struct tracer *tracer = tr->current_trace; 188 189 if (wakeup_function_set(tr, mask, set)) 190 return 0; 191 192 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 193 if (mask & TRACE_ITER_DISPLAY_GRAPH) 194 return wakeup_display_graph(tr, set); 195 #endif 196 197 return trace_keep_overwrite(tracer, mask, set); 198 } 199 200 static int start_func_tracer(struct trace_array *tr, int graph) 201 { 202 int ret; 203 204 ret = register_wakeup_function(tr, graph, 0); 205 206 if (!ret && tracing_is_enabled()) 207 tracer_enabled = 1; 208 else 209 tracer_enabled = 0; 210 211 return ret; 212 } 213 214 static void stop_func_tracer(struct trace_array *tr, int graph) 215 { 216 tracer_enabled = 0; 217 218 unregister_wakeup_function(tr, graph); 219 } 220 221 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 222 static int wakeup_display_graph(struct trace_array *tr, int set) 223 { 224 if (!(is_graph(tr) ^ set)) 225 return 0; 226 227 stop_func_tracer(tr, !set); 228 229 wakeup_reset(wakeup_trace); 230 tr->max_latency = 0; 231 232 return start_func_tracer(tr, set); 233 } 234 235 static int wakeup_graph_entry(struct ftrace_graph_ent *trace) 236 { 237 struct trace_array *tr = wakeup_trace; 238 struct trace_array_cpu *data; 239 unsigned long flags; 240 int pc, ret = 0; 241 242 if (ftrace_graph_ignore_func(trace)) 243 return 0; 244 /* 245 * Do not trace a function if it's filtered by set_graph_notrace. 246 * Make the index of ret stack negative to indicate that it should 247 * ignore further functions. But it needs its own ret stack entry 248 * to recover the original index in order to continue tracing after 249 * returning from the function. 250 */ 251 if (ftrace_graph_notrace_addr(trace->func)) 252 return 1; 253 254 if (!func_prolog_preempt_disable(tr, &data, &pc)) 255 return 0; 256 257 local_save_flags(flags); 258 ret = __trace_graph_entry(tr, trace, flags, pc); 259 atomic_dec(&data->disabled); 260 preempt_enable_notrace(); 261 262 return ret; 263 } 264 265 static void wakeup_graph_return(struct ftrace_graph_ret *trace) 266 { 267 struct trace_array *tr = wakeup_trace; 268 struct trace_array_cpu *data; 269 unsigned long flags; 270 int pc; 271 272 if (!func_prolog_preempt_disable(tr, &data, &pc)) 273 return; 274 275 local_save_flags(flags); 276 __trace_graph_return(tr, trace, flags, pc); 277 atomic_dec(&data->disabled); 278 279 preempt_enable_notrace(); 280 return; 281 } 282 283 static void wakeup_trace_open(struct trace_iterator *iter) 284 { 285 if (is_graph(iter->tr)) 286 graph_trace_open(iter); 287 } 288 289 static void wakeup_trace_close(struct trace_iterator *iter) 290 { 291 if (iter->private) 292 graph_trace_close(iter); 293 } 294 295 #define GRAPH_TRACER_FLAGS (TRACE_GRAPH_PRINT_PROC | \ 296 TRACE_GRAPH_PRINT_ABS_TIME | \ 297 TRACE_GRAPH_PRINT_DURATION) 298 299 static enum print_line_t wakeup_print_line(struct trace_iterator *iter) 300 { 301 /* 302 * In graph mode call the graph tracer output function, 303 * otherwise go with the TRACE_FN event handler 304 */ 305 if (is_graph(iter->tr)) 306 return print_graph_function_flags(iter, GRAPH_TRACER_FLAGS); 307 308 return TRACE_TYPE_UNHANDLED; 309 } 310 311 static void wakeup_print_header(struct seq_file *s) 312 { 313 if (is_graph(wakeup_trace)) 314 print_graph_headers_flags(s, GRAPH_TRACER_FLAGS); 315 else 316 trace_default_header(s); 317 } 318 319 static void 320 __trace_function(struct trace_array *tr, 321 unsigned long ip, unsigned long parent_ip, 322 unsigned long flags, int pc) 323 { 324 if (is_graph(tr)) 325 trace_graph_function(tr, ip, parent_ip, flags, pc); 326 else 327 trace_function(tr, ip, parent_ip, flags, pc); 328 } 329 #else 330 #define __trace_function trace_function 331 332 static enum print_line_t wakeup_print_line(struct trace_iterator *iter) 333 { 334 return TRACE_TYPE_UNHANDLED; 335 } 336 337 static void wakeup_trace_open(struct trace_iterator *iter) { } 338 static void wakeup_trace_close(struct trace_iterator *iter) { } 339 340 #ifdef CONFIG_FUNCTION_TRACER 341 static int wakeup_graph_entry(struct ftrace_graph_ent *trace) 342 { 343 return -1; 344 } 345 static void wakeup_graph_return(struct ftrace_graph_ret *trace) { } 346 static void wakeup_print_header(struct seq_file *s) 347 { 348 trace_default_header(s); 349 } 350 #else 351 static void wakeup_print_header(struct seq_file *s) 352 { 353 trace_latency_header(s); 354 } 355 #endif /* CONFIG_FUNCTION_TRACER */ 356 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ 357 358 /* 359 * Should this new latency be reported/recorded? 360 */ 361 static bool report_latency(struct trace_array *tr, u64 delta) 362 { 363 if (tracing_thresh) { 364 if (delta < tracing_thresh) 365 return false; 366 } else { 367 if (delta <= tr->max_latency) 368 return false; 369 } 370 return true; 371 } 372 373 static void 374 probe_wakeup_migrate_task(void *ignore, struct task_struct *task, int cpu) 375 { 376 if (task != wakeup_task) 377 return; 378 379 wakeup_current_cpu = cpu; 380 } 381 382 static void 383 tracing_sched_switch_trace(struct trace_array *tr, 384 struct task_struct *prev, 385 struct task_struct *next, 386 unsigned long flags, int pc) 387 { 388 struct trace_event_call *call = &event_context_switch; 389 struct ring_buffer *buffer = tr->trace_buffer.buffer; 390 struct ring_buffer_event *event; 391 struct ctx_switch_entry *entry; 392 393 event = trace_buffer_lock_reserve(buffer, TRACE_CTX, 394 sizeof(*entry), flags, pc); 395 if (!event) 396 return; 397 entry = ring_buffer_event_data(event); 398 entry->prev_pid = prev->pid; 399 entry->prev_prio = prev->prio; 400 entry->prev_state = prev->state; 401 entry->next_pid = next->pid; 402 entry->next_prio = next->prio; 403 entry->next_state = next->state; 404 entry->next_cpu = task_cpu(next); 405 406 if (!call_filter_check_discard(call, entry, buffer, event)) 407 trace_buffer_unlock_commit(tr, buffer, event, flags, pc); 408 } 409 410 static void 411 tracing_sched_wakeup_trace(struct trace_array *tr, 412 struct task_struct *wakee, 413 struct task_struct *curr, 414 unsigned long flags, int pc) 415 { 416 struct trace_event_call *call = &event_wakeup; 417 struct ring_buffer_event *event; 418 struct ctx_switch_entry *entry; 419 struct ring_buffer *buffer = tr->trace_buffer.buffer; 420 421 event = trace_buffer_lock_reserve(buffer, TRACE_WAKE, 422 sizeof(*entry), flags, pc); 423 if (!event) 424 return; 425 entry = ring_buffer_event_data(event); 426 entry->prev_pid = curr->pid; 427 entry->prev_prio = curr->prio; 428 entry->prev_state = curr->state; 429 entry->next_pid = wakee->pid; 430 entry->next_prio = wakee->prio; 431 entry->next_state = wakee->state; 432 entry->next_cpu = task_cpu(wakee); 433 434 if (!call_filter_check_discard(call, entry, buffer, event)) 435 trace_buffer_unlock_commit(tr, buffer, event, flags, pc); 436 } 437 438 static void notrace 439 probe_wakeup_sched_switch(void *ignore, bool preempt, 440 struct task_struct *prev, struct task_struct *next) 441 { 442 struct trace_array_cpu *data; 443 u64 T0, T1, delta; 444 unsigned long flags; 445 long disabled; 446 int cpu; 447 int pc; 448 449 tracing_record_cmdline(prev); 450 451 if (unlikely(!tracer_enabled)) 452 return; 453 454 /* 455 * When we start a new trace, we set wakeup_task to NULL 456 * and then set tracer_enabled = 1. We want to make sure 457 * that another CPU does not see the tracer_enabled = 1 458 * and the wakeup_task with an older task, that might 459 * actually be the same as next. 460 */ 461 smp_rmb(); 462 463 if (next != wakeup_task) 464 return; 465 466 pc = preempt_count(); 467 468 /* disable local data, not wakeup_cpu data */ 469 cpu = raw_smp_processor_id(); 470 disabled = atomic_inc_return(&per_cpu_ptr(wakeup_trace->trace_buffer.data, cpu)->disabled); 471 if (likely(disabled != 1)) 472 goto out; 473 474 local_irq_save(flags); 475 arch_spin_lock(&wakeup_lock); 476 477 /* We could race with grabbing wakeup_lock */ 478 if (unlikely(!tracer_enabled || next != wakeup_task)) 479 goto out_unlock; 480 481 /* The task we are waiting for is waking up */ 482 data = per_cpu_ptr(wakeup_trace->trace_buffer.data, wakeup_cpu); 483 484 __trace_function(wakeup_trace, CALLER_ADDR0, CALLER_ADDR1, flags, pc); 485 tracing_sched_switch_trace(wakeup_trace, prev, next, flags, pc); 486 487 T0 = data->preempt_timestamp; 488 T1 = ftrace_now(cpu); 489 delta = T1-T0; 490 491 if (!report_latency(wakeup_trace, delta)) 492 goto out_unlock; 493 494 if (likely(!is_tracing_stopped())) { 495 wakeup_trace->max_latency = delta; 496 update_max_tr(wakeup_trace, wakeup_task, wakeup_cpu); 497 } 498 499 out_unlock: 500 __wakeup_reset(wakeup_trace); 501 arch_spin_unlock(&wakeup_lock); 502 local_irq_restore(flags); 503 out: 504 atomic_dec(&per_cpu_ptr(wakeup_trace->trace_buffer.data, cpu)->disabled); 505 } 506 507 static void __wakeup_reset(struct trace_array *tr) 508 { 509 wakeup_cpu = -1; 510 wakeup_prio = -1; 511 tracing_dl = 0; 512 513 if (wakeup_task) 514 put_task_struct(wakeup_task); 515 516 wakeup_task = NULL; 517 } 518 519 static void wakeup_reset(struct trace_array *tr) 520 { 521 unsigned long flags; 522 523 tracing_reset_online_cpus(&tr->trace_buffer); 524 525 local_irq_save(flags); 526 arch_spin_lock(&wakeup_lock); 527 __wakeup_reset(tr); 528 arch_spin_unlock(&wakeup_lock); 529 local_irq_restore(flags); 530 } 531 532 static void 533 probe_wakeup(void *ignore, struct task_struct *p) 534 { 535 struct trace_array_cpu *data; 536 int cpu = smp_processor_id(); 537 unsigned long flags; 538 long disabled; 539 int pc; 540 541 if (likely(!tracer_enabled)) 542 return; 543 544 tracing_record_cmdline(p); 545 tracing_record_cmdline(current); 546 547 /* 548 * Semantic is like this: 549 * - wakeup tracer handles all tasks in the system, independently 550 * from their scheduling class; 551 * - wakeup_rt tracer handles tasks belonging to sched_dl and 552 * sched_rt class; 553 * - wakeup_dl handles tasks belonging to sched_dl class only. 554 */ 555 if (tracing_dl || (wakeup_dl && !dl_task(p)) || 556 (wakeup_rt && !dl_task(p) && !rt_task(p)) || 557 (!dl_task(p) && (p->prio >= wakeup_prio || p->prio >= current->prio))) 558 return; 559 560 pc = preempt_count(); 561 disabled = atomic_inc_return(&per_cpu_ptr(wakeup_trace->trace_buffer.data, cpu)->disabled); 562 if (unlikely(disabled != 1)) 563 goto out; 564 565 /* interrupts should be off from try_to_wake_up */ 566 arch_spin_lock(&wakeup_lock); 567 568 /* check for races. */ 569 if (!tracer_enabled || tracing_dl || 570 (!dl_task(p) && p->prio >= wakeup_prio)) 571 goto out_locked; 572 573 /* reset the trace */ 574 __wakeup_reset(wakeup_trace); 575 576 wakeup_cpu = task_cpu(p); 577 wakeup_current_cpu = wakeup_cpu; 578 wakeup_prio = p->prio; 579 580 /* 581 * Once you start tracing a -deadline task, don't bother tracing 582 * another task until the first one wakes up. 583 */ 584 if (dl_task(p)) 585 tracing_dl = 1; 586 else 587 tracing_dl = 0; 588 589 wakeup_task = p; 590 get_task_struct(wakeup_task); 591 592 local_save_flags(flags); 593 594 data = per_cpu_ptr(wakeup_trace->trace_buffer.data, wakeup_cpu); 595 data->preempt_timestamp = ftrace_now(cpu); 596 tracing_sched_wakeup_trace(wakeup_trace, p, current, flags, pc); 597 598 /* 599 * We must be careful in using CALLER_ADDR2. But since wake_up 600 * is not called by an assembly function (where as schedule is) 601 * it should be safe to use it here. 602 */ 603 __trace_function(wakeup_trace, CALLER_ADDR1, CALLER_ADDR2, flags, pc); 604 605 out_locked: 606 arch_spin_unlock(&wakeup_lock); 607 out: 608 atomic_dec(&per_cpu_ptr(wakeup_trace->trace_buffer.data, cpu)->disabled); 609 } 610 611 static void start_wakeup_tracer(struct trace_array *tr) 612 { 613 int ret; 614 615 ret = register_trace_sched_wakeup(probe_wakeup, NULL); 616 if (ret) { 617 pr_info("wakeup trace: Couldn't activate tracepoint" 618 " probe to kernel_sched_wakeup\n"); 619 return; 620 } 621 622 ret = register_trace_sched_wakeup_new(probe_wakeup, NULL); 623 if (ret) { 624 pr_info("wakeup trace: Couldn't activate tracepoint" 625 " probe to kernel_sched_wakeup_new\n"); 626 goto fail_deprobe; 627 } 628 629 ret = register_trace_sched_switch(probe_wakeup_sched_switch, NULL); 630 if (ret) { 631 pr_info("sched trace: Couldn't activate tracepoint" 632 " probe to kernel_sched_switch\n"); 633 goto fail_deprobe_wake_new; 634 } 635 636 ret = register_trace_sched_migrate_task(probe_wakeup_migrate_task, NULL); 637 if (ret) { 638 pr_info("wakeup trace: Couldn't activate tracepoint" 639 " probe to kernel_sched_migrate_task\n"); 640 return; 641 } 642 643 wakeup_reset(tr); 644 645 /* 646 * Don't let the tracer_enabled = 1 show up before 647 * the wakeup_task is reset. This may be overkill since 648 * wakeup_reset does a spin_unlock after setting the 649 * wakeup_task to NULL, but I want to be safe. 650 * This is a slow path anyway. 651 */ 652 smp_wmb(); 653 654 if (start_func_tracer(tr, is_graph(tr))) 655 printk(KERN_ERR "failed to start wakeup tracer\n"); 656 657 return; 658 fail_deprobe_wake_new: 659 unregister_trace_sched_wakeup_new(probe_wakeup, NULL); 660 fail_deprobe: 661 unregister_trace_sched_wakeup(probe_wakeup, NULL); 662 } 663 664 static void stop_wakeup_tracer(struct trace_array *tr) 665 { 666 tracer_enabled = 0; 667 stop_func_tracer(tr, is_graph(tr)); 668 unregister_trace_sched_switch(probe_wakeup_sched_switch, NULL); 669 unregister_trace_sched_wakeup_new(probe_wakeup, NULL); 670 unregister_trace_sched_wakeup(probe_wakeup, NULL); 671 unregister_trace_sched_migrate_task(probe_wakeup_migrate_task, NULL); 672 } 673 674 static bool wakeup_busy; 675 676 static int __wakeup_tracer_init(struct trace_array *tr) 677 { 678 save_flags = tr->trace_flags; 679 680 /* non overwrite screws up the latency tracers */ 681 set_tracer_flag(tr, TRACE_ITER_OVERWRITE, 1); 682 set_tracer_flag(tr, TRACE_ITER_LATENCY_FMT, 1); 683 684 tr->max_latency = 0; 685 wakeup_trace = tr; 686 ftrace_init_array_ops(tr, wakeup_tracer_call); 687 start_wakeup_tracer(tr); 688 689 wakeup_busy = true; 690 return 0; 691 } 692 693 static int wakeup_tracer_init(struct trace_array *tr) 694 { 695 if (wakeup_busy) 696 return -EBUSY; 697 698 wakeup_dl = 0; 699 wakeup_rt = 0; 700 return __wakeup_tracer_init(tr); 701 } 702 703 static int wakeup_rt_tracer_init(struct trace_array *tr) 704 { 705 if (wakeup_busy) 706 return -EBUSY; 707 708 wakeup_dl = 0; 709 wakeup_rt = 1; 710 return __wakeup_tracer_init(tr); 711 } 712 713 static int wakeup_dl_tracer_init(struct trace_array *tr) 714 { 715 if (wakeup_busy) 716 return -EBUSY; 717 718 wakeup_dl = 1; 719 wakeup_rt = 0; 720 return __wakeup_tracer_init(tr); 721 } 722 723 static void wakeup_tracer_reset(struct trace_array *tr) 724 { 725 int lat_flag = save_flags & TRACE_ITER_LATENCY_FMT; 726 int overwrite_flag = save_flags & TRACE_ITER_OVERWRITE; 727 728 stop_wakeup_tracer(tr); 729 /* make sure we put back any tasks we are tracing */ 730 wakeup_reset(tr); 731 732 set_tracer_flag(tr, TRACE_ITER_LATENCY_FMT, lat_flag); 733 set_tracer_flag(tr, TRACE_ITER_OVERWRITE, overwrite_flag); 734 ftrace_reset_array_ops(tr); 735 wakeup_busy = false; 736 } 737 738 static void wakeup_tracer_start(struct trace_array *tr) 739 { 740 wakeup_reset(tr); 741 tracer_enabled = 1; 742 } 743 744 static void wakeup_tracer_stop(struct trace_array *tr) 745 { 746 tracer_enabled = 0; 747 } 748 749 static struct tracer wakeup_tracer __read_mostly = 750 { 751 .name = "wakeup", 752 .init = wakeup_tracer_init, 753 .reset = wakeup_tracer_reset, 754 .start = wakeup_tracer_start, 755 .stop = wakeup_tracer_stop, 756 .print_max = true, 757 .print_header = wakeup_print_header, 758 .print_line = wakeup_print_line, 759 .flag_changed = wakeup_flag_changed, 760 #ifdef CONFIG_FTRACE_SELFTEST 761 .selftest = trace_selftest_startup_wakeup, 762 #endif 763 .open = wakeup_trace_open, 764 .close = wakeup_trace_close, 765 .allow_instances = true, 766 .use_max_tr = true, 767 }; 768 769 static struct tracer wakeup_rt_tracer __read_mostly = 770 { 771 .name = "wakeup_rt", 772 .init = wakeup_rt_tracer_init, 773 .reset = wakeup_tracer_reset, 774 .start = wakeup_tracer_start, 775 .stop = wakeup_tracer_stop, 776 .print_max = true, 777 .print_header = wakeup_print_header, 778 .print_line = wakeup_print_line, 779 .flag_changed = wakeup_flag_changed, 780 #ifdef CONFIG_FTRACE_SELFTEST 781 .selftest = trace_selftest_startup_wakeup, 782 #endif 783 .open = wakeup_trace_open, 784 .close = wakeup_trace_close, 785 .allow_instances = true, 786 .use_max_tr = true, 787 }; 788 789 static struct tracer wakeup_dl_tracer __read_mostly = 790 { 791 .name = "wakeup_dl", 792 .init = wakeup_dl_tracer_init, 793 .reset = wakeup_tracer_reset, 794 .start = wakeup_tracer_start, 795 .stop = wakeup_tracer_stop, 796 .print_max = true, 797 .print_header = wakeup_print_header, 798 .print_line = wakeup_print_line, 799 .flag_changed = wakeup_flag_changed, 800 #ifdef CONFIG_FTRACE_SELFTEST 801 .selftest = trace_selftest_startup_wakeup, 802 #endif 803 .open = wakeup_trace_open, 804 .close = wakeup_trace_close, 805 .allow_instances = true, 806 .use_max_tr = true, 807 }; 808 809 __init static int init_wakeup_tracer(void) 810 { 811 int ret; 812 813 ret = register_tracer(&wakeup_tracer); 814 if (ret) 815 return ret; 816 817 ret = register_tracer(&wakeup_rt_tracer); 818 if (ret) 819 return ret; 820 821 ret = register_tracer(&wakeup_dl_tracer); 822 if (ret) 823 return ret; 824 825 return 0; 826 } 827 core_initcall(init_wakeup_tracer); 828