1 // SPDX-License-Identifier: GPL-2.0 2 #include "builtin.h" 3 #include "perf-sys.h" 4 5 #include "util/cpumap.h" 6 #include "util/evlist.h" 7 #include "util/evsel.h" 8 #include "util/evsel_fprintf.h" 9 #include "util/mutex.h" 10 #include "util/symbol.h" 11 #include "util/thread.h" 12 #include "util/header.h" 13 #include "util/session.h" 14 #include "util/tool.h" 15 #include "util/cloexec.h" 16 #include "util/thread_map.h" 17 #include "util/color.h" 18 #include "util/stat.h" 19 #include "util/string2.h" 20 #include "util/callchain.h" 21 #include "util/time-utils.h" 22 23 #include <subcmd/pager.h> 24 #include <subcmd/parse-options.h> 25 #include "util/trace-event.h" 26 27 #include "util/debug.h" 28 #include "util/event.h" 29 #include "util/util.h" 30 31 #include <linux/kernel.h> 32 #include <linux/log2.h> 33 #include <linux/zalloc.h> 34 #include <sys/prctl.h> 35 #include <sys/resource.h> 36 #include <inttypes.h> 37 38 #include <errno.h> 39 #include <semaphore.h> 40 #include <pthread.h> 41 #include <math.h> 42 #include <api/fs/fs.h> 43 #include <perf/cpumap.h> 44 #include <linux/time64.h> 45 #include <linux/err.h> 46 47 #include <linux/ctype.h> 48 49 #define PR_SET_NAME 15 /* Set process name */ 50 #define MAX_CPUS 4096 51 #define COMM_LEN 20 52 #define SYM_LEN 129 53 #define MAX_PID 1024000 54 55 static const char *cpu_list; 56 static DECLARE_BITMAP(cpu_bitmap, MAX_NR_CPUS); 57 58 struct sched_atom; 59 60 struct task_desc { 61 unsigned long nr; 62 unsigned long pid; 63 char comm[COMM_LEN]; 64 65 unsigned long nr_events; 66 unsigned long curr_event; 67 struct sched_atom **atoms; 68 69 pthread_t thread; 70 sem_t sleep_sem; 71 72 sem_t ready_for_work; 73 sem_t work_done_sem; 74 75 u64 cpu_usage; 76 }; 77 78 enum sched_event_type { 79 SCHED_EVENT_RUN, 80 SCHED_EVENT_SLEEP, 81 SCHED_EVENT_WAKEUP, 82 SCHED_EVENT_MIGRATION, 83 }; 84 85 struct sched_atom { 86 enum sched_event_type type; 87 int specific_wait; 88 u64 timestamp; 89 u64 duration; 90 unsigned long nr; 91 sem_t *wait_sem; 92 struct task_desc *wakee; 93 }; 94 95 #define TASK_STATE_TO_CHAR_STR "RSDTtZXxKWP" 96 97 /* task state bitmask, copied from include/linux/sched.h */ 98 #define TASK_RUNNING 0 99 #define TASK_INTERRUPTIBLE 1 100 #define TASK_UNINTERRUPTIBLE 2 101 #define __TASK_STOPPED 4 102 #define __TASK_TRACED 8 103 /* in tsk->exit_state */ 104 #define EXIT_DEAD 16 105 #define EXIT_ZOMBIE 32 106 #define EXIT_TRACE (EXIT_ZOMBIE | EXIT_DEAD) 107 /* in tsk->state again */ 108 #define TASK_DEAD 64 109 #define TASK_WAKEKILL 128 110 #define TASK_WAKING 256 111 #define TASK_PARKED 512 112 113 enum thread_state { 114 THREAD_SLEEPING = 0, 115 THREAD_WAIT_CPU, 116 THREAD_SCHED_IN, 117 THREAD_IGNORE 118 }; 119 120 struct work_atom { 121 struct list_head list; 122 enum thread_state state; 123 u64 sched_out_time; 124 u64 wake_up_time; 125 u64 sched_in_time; 126 u64 runtime; 127 }; 128 129 struct work_atoms { 130 struct list_head work_list; 131 struct thread *thread; 132 struct rb_node node; 133 u64 max_lat; 134 u64 max_lat_start; 135 u64 max_lat_end; 136 u64 total_lat; 137 u64 nb_atoms; 138 u64 total_runtime; 139 int num_merged; 140 }; 141 142 typedef int (*sort_fn_t)(struct work_atoms *, struct work_atoms *); 143 144 struct perf_sched; 145 146 struct trace_sched_handler { 147 int (*switch_event)(struct perf_sched *sched, struct evsel *evsel, 148 struct perf_sample *sample, struct machine *machine); 149 150 int (*runtime_event)(struct perf_sched *sched, struct evsel *evsel, 151 struct perf_sample *sample, struct machine *machine); 152 153 int (*wakeup_event)(struct perf_sched *sched, struct evsel *evsel, 154 struct perf_sample *sample, struct machine *machine); 155 156 /* PERF_RECORD_FORK event, not sched_process_fork tracepoint */ 157 int (*fork_event)(struct perf_sched *sched, union perf_event *event, 158 struct machine *machine); 159 160 int (*migrate_task_event)(struct perf_sched *sched, 161 struct evsel *evsel, 162 struct perf_sample *sample, 163 struct machine *machine); 164 }; 165 166 #define COLOR_PIDS PERF_COLOR_BLUE 167 #define COLOR_CPUS PERF_COLOR_BG_RED 168 169 struct perf_sched_map { 170 DECLARE_BITMAP(comp_cpus_mask, MAX_CPUS); 171 struct perf_cpu *comp_cpus; 172 bool comp; 173 struct perf_thread_map *color_pids; 174 const char *color_pids_str; 175 struct perf_cpu_map *color_cpus; 176 const char *color_cpus_str; 177 struct perf_cpu_map *cpus; 178 const char *cpus_str; 179 }; 180 181 struct perf_sched { 182 struct perf_tool tool; 183 const char *sort_order; 184 unsigned long nr_tasks; 185 struct task_desc **pid_to_task; 186 struct task_desc **tasks; 187 const struct trace_sched_handler *tp_handler; 188 struct mutex start_work_mutex; 189 struct mutex work_done_wait_mutex; 190 int profile_cpu; 191 /* 192 * Track the current task - that way we can know whether there's any 193 * weird events, such as a task being switched away that is not current. 194 */ 195 struct perf_cpu max_cpu; 196 u32 curr_pid[MAX_CPUS]; 197 struct thread *curr_thread[MAX_CPUS]; 198 char next_shortname1; 199 char next_shortname2; 200 unsigned int replay_repeat; 201 unsigned long nr_run_events; 202 unsigned long nr_sleep_events; 203 unsigned long nr_wakeup_events; 204 unsigned long nr_sleep_corrections; 205 unsigned long nr_run_events_optimized; 206 unsigned long targetless_wakeups; 207 unsigned long multitarget_wakeups; 208 unsigned long nr_runs; 209 unsigned long nr_timestamps; 210 unsigned long nr_unordered_timestamps; 211 unsigned long nr_context_switch_bugs; 212 unsigned long nr_events; 213 unsigned long nr_lost_chunks; 214 unsigned long nr_lost_events; 215 u64 run_measurement_overhead; 216 u64 sleep_measurement_overhead; 217 u64 start_time; 218 u64 cpu_usage; 219 u64 runavg_cpu_usage; 220 u64 parent_cpu_usage; 221 u64 runavg_parent_cpu_usage; 222 u64 sum_runtime; 223 u64 sum_fluct; 224 u64 run_avg; 225 u64 all_runtime; 226 u64 all_count; 227 u64 cpu_last_switched[MAX_CPUS]; 228 struct rb_root_cached atom_root, sorted_atom_root, merged_atom_root; 229 struct list_head sort_list, cmp_pid; 230 bool force; 231 bool skip_merge; 232 struct perf_sched_map map; 233 234 /* options for timehist command */ 235 bool summary; 236 bool summary_only; 237 bool idle_hist; 238 bool show_callchain; 239 unsigned int max_stack; 240 bool show_cpu_visual; 241 bool show_wakeups; 242 bool show_next; 243 bool show_migrations; 244 bool show_state; 245 u64 skipped_samples; 246 const char *time_str; 247 struct perf_time_interval ptime; 248 struct perf_time_interval hist_time; 249 volatile bool thread_funcs_exit; 250 }; 251 252 /* per thread run time data */ 253 struct thread_runtime { 254 u64 last_time; /* time of previous sched in/out event */ 255 u64 dt_run; /* run time */ 256 u64 dt_sleep; /* time between CPU access by sleep (off cpu) */ 257 u64 dt_iowait; /* time between CPU access by iowait (off cpu) */ 258 u64 dt_preempt; /* time between CPU access by preempt (off cpu) */ 259 u64 dt_delay; /* time between wakeup and sched-in */ 260 u64 ready_to_run; /* time of wakeup */ 261 262 struct stats run_stats; 263 u64 total_run_time; 264 u64 total_sleep_time; 265 u64 total_iowait_time; 266 u64 total_preempt_time; 267 u64 total_delay_time; 268 269 int last_state; 270 271 char shortname[3]; 272 bool comm_changed; 273 274 u64 migrations; 275 }; 276 277 /* per event run time data */ 278 struct evsel_runtime { 279 u64 *last_time; /* time this event was last seen per cpu */ 280 u32 ncpu; /* highest cpu slot allocated */ 281 }; 282 283 /* per cpu idle time data */ 284 struct idle_thread_runtime { 285 struct thread_runtime tr; 286 struct thread *last_thread; 287 struct rb_root_cached sorted_root; 288 struct callchain_root callchain; 289 struct callchain_cursor cursor; 290 }; 291 292 /* track idle times per cpu */ 293 static struct thread **idle_threads; 294 static int idle_max_cpu; 295 static char idle_comm[] = "<idle>"; 296 297 static u64 get_nsecs(void) 298 { 299 struct timespec ts; 300 301 clock_gettime(CLOCK_MONOTONIC, &ts); 302 303 return ts.tv_sec * NSEC_PER_SEC + ts.tv_nsec; 304 } 305 306 static void burn_nsecs(struct perf_sched *sched, u64 nsecs) 307 { 308 u64 T0 = get_nsecs(), T1; 309 310 do { 311 T1 = get_nsecs(); 312 } while (T1 + sched->run_measurement_overhead < T0 + nsecs); 313 } 314 315 static void sleep_nsecs(u64 nsecs) 316 { 317 struct timespec ts; 318 319 ts.tv_nsec = nsecs % 999999999; 320 ts.tv_sec = nsecs / 999999999; 321 322 nanosleep(&ts, NULL); 323 } 324 325 static void calibrate_run_measurement_overhead(struct perf_sched *sched) 326 { 327 u64 T0, T1, delta, min_delta = NSEC_PER_SEC; 328 int i; 329 330 for (i = 0; i < 10; i++) { 331 T0 = get_nsecs(); 332 burn_nsecs(sched, 0); 333 T1 = get_nsecs(); 334 delta = T1-T0; 335 min_delta = min(min_delta, delta); 336 } 337 sched->run_measurement_overhead = min_delta; 338 339 printf("run measurement overhead: %" PRIu64 " nsecs\n", min_delta); 340 } 341 342 static void calibrate_sleep_measurement_overhead(struct perf_sched *sched) 343 { 344 u64 T0, T1, delta, min_delta = NSEC_PER_SEC; 345 int i; 346 347 for (i = 0; i < 10; i++) { 348 T0 = get_nsecs(); 349 sleep_nsecs(10000); 350 T1 = get_nsecs(); 351 delta = T1-T0; 352 min_delta = min(min_delta, delta); 353 } 354 min_delta -= 10000; 355 sched->sleep_measurement_overhead = min_delta; 356 357 printf("sleep measurement overhead: %" PRIu64 " nsecs\n", min_delta); 358 } 359 360 static struct sched_atom * 361 get_new_event(struct task_desc *task, u64 timestamp) 362 { 363 struct sched_atom *event = zalloc(sizeof(*event)); 364 unsigned long idx = task->nr_events; 365 size_t size; 366 367 event->timestamp = timestamp; 368 event->nr = idx; 369 370 task->nr_events++; 371 size = sizeof(struct sched_atom *) * task->nr_events; 372 task->atoms = realloc(task->atoms, size); 373 BUG_ON(!task->atoms); 374 375 task->atoms[idx] = event; 376 377 return event; 378 } 379 380 static struct sched_atom *last_event(struct task_desc *task) 381 { 382 if (!task->nr_events) 383 return NULL; 384 385 return task->atoms[task->nr_events - 1]; 386 } 387 388 static void add_sched_event_run(struct perf_sched *sched, struct task_desc *task, 389 u64 timestamp, u64 duration) 390 { 391 struct sched_atom *event, *curr_event = last_event(task); 392 393 /* 394 * optimize an existing RUN event by merging this one 395 * to it: 396 */ 397 if (curr_event && curr_event->type == SCHED_EVENT_RUN) { 398 sched->nr_run_events_optimized++; 399 curr_event->duration += duration; 400 return; 401 } 402 403 event = get_new_event(task, timestamp); 404 405 event->type = SCHED_EVENT_RUN; 406 event->duration = duration; 407 408 sched->nr_run_events++; 409 } 410 411 static void add_sched_event_wakeup(struct perf_sched *sched, struct task_desc *task, 412 u64 timestamp, struct task_desc *wakee) 413 { 414 struct sched_atom *event, *wakee_event; 415 416 event = get_new_event(task, timestamp); 417 event->type = SCHED_EVENT_WAKEUP; 418 event->wakee = wakee; 419 420 wakee_event = last_event(wakee); 421 if (!wakee_event || wakee_event->type != SCHED_EVENT_SLEEP) { 422 sched->targetless_wakeups++; 423 return; 424 } 425 if (wakee_event->wait_sem) { 426 sched->multitarget_wakeups++; 427 return; 428 } 429 430 wakee_event->wait_sem = zalloc(sizeof(*wakee_event->wait_sem)); 431 sem_init(wakee_event->wait_sem, 0, 0); 432 wakee_event->specific_wait = 1; 433 event->wait_sem = wakee_event->wait_sem; 434 435 sched->nr_wakeup_events++; 436 } 437 438 static void add_sched_event_sleep(struct perf_sched *sched, struct task_desc *task, 439 u64 timestamp, u64 task_state __maybe_unused) 440 { 441 struct sched_atom *event = get_new_event(task, timestamp); 442 443 event->type = SCHED_EVENT_SLEEP; 444 445 sched->nr_sleep_events++; 446 } 447 448 static struct task_desc *register_pid(struct perf_sched *sched, 449 unsigned long pid, const char *comm) 450 { 451 struct task_desc *task; 452 static int pid_max; 453 454 if (sched->pid_to_task == NULL) { 455 if (sysctl__read_int("kernel/pid_max", &pid_max) < 0) 456 pid_max = MAX_PID; 457 BUG_ON((sched->pid_to_task = calloc(pid_max, sizeof(struct task_desc *))) == NULL); 458 } 459 if (pid >= (unsigned long)pid_max) { 460 BUG_ON((sched->pid_to_task = realloc(sched->pid_to_task, (pid + 1) * 461 sizeof(struct task_desc *))) == NULL); 462 while (pid >= (unsigned long)pid_max) 463 sched->pid_to_task[pid_max++] = NULL; 464 } 465 466 task = sched->pid_to_task[pid]; 467 468 if (task) 469 return task; 470 471 task = zalloc(sizeof(*task)); 472 task->pid = pid; 473 task->nr = sched->nr_tasks; 474 strcpy(task->comm, comm); 475 /* 476 * every task starts in sleeping state - this gets ignored 477 * if there's no wakeup pointing to this sleep state: 478 */ 479 add_sched_event_sleep(sched, task, 0, 0); 480 481 sched->pid_to_task[pid] = task; 482 sched->nr_tasks++; 483 sched->tasks = realloc(sched->tasks, sched->nr_tasks * sizeof(struct task_desc *)); 484 BUG_ON(!sched->tasks); 485 sched->tasks[task->nr] = task; 486 487 if (verbose > 0) 488 printf("registered task #%ld, PID %ld (%s)\n", sched->nr_tasks, pid, comm); 489 490 return task; 491 } 492 493 494 static void print_task_traces(struct perf_sched *sched) 495 { 496 struct task_desc *task; 497 unsigned long i; 498 499 for (i = 0; i < sched->nr_tasks; i++) { 500 task = sched->tasks[i]; 501 printf("task %6ld (%20s:%10ld), nr_events: %ld\n", 502 task->nr, task->comm, task->pid, task->nr_events); 503 } 504 } 505 506 static void add_cross_task_wakeups(struct perf_sched *sched) 507 { 508 struct task_desc *task1, *task2; 509 unsigned long i, j; 510 511 for (i = 0; i < sched->nr_tasks; i++) { 512 task1 = sched->tasks[i]; 513 j = i + 1; 514 if (j == sched->nr_tasks) 515 j = 0; 516 task2 = sched->tasks[j]; 517 add_sched_event_wakeup(sched, task1, 0, task2); 518 } 519 } 520 521 static void perf_sched__process_event(struct perf_sched *sched, 522 struct sched_atom *atom) 523 { 524 int ret = 0; 525 526 switch (atom->type) { 527 case SCHED_EVENT_RUN: 528 burn_nsecs(sched, atom->duration); 529 break; 530 case SCHED_EVENT_SLEEP: 531 if (atom->wait_sem) 532 ret = sem_wait(atom->wait_sem); 533 BUG_ON(ret); 534 break; 535 case SCHED_EVENT_WAKEUP: 536 if (atom->wait_sem) 537 ret = sem_post(atom->wait_sem); 538 BUG_ON(ret); 539 break; 540 case SCHED_EVENT_MIGRATION: 541 break; 542 default: 543 BUG_ON(1); 544 } 545 } 546 547 static u64 get_cpu_usage_nsec_parent(void) 548 { 549 struct rusage ru; 550 u64 sum; 551 int err; 552 553 err = getrusage(RUSAGE_SELF, &ru); 554 BUG_ON(err); 555 556 sum = ru.ru_utime.tv_sec * NSEC_PER_SEC + ru.ru_utime.tv_usec * NSEC_PER_USEC; 557 sum += ru.ru_stime.tv_sec * NSEC_PER_SEC + ru.ru_stime.tv_usec * NSEC_PER_USEC; 558 559 return sum; 560 } 561 562 static int self_open_counters(struct perf_sched *sched, unsigned long cur_task) 563 { 564 struct perf_event_attr attr; 565 char sbuf[STRERR_BUFSIZE], info[STRERR_BUFSIZE]; 566 int fd; 567 struct rlimit limit; 568 bool need_privilege = false; 569 570 memset(&attr, 0, sizeof(attr)); 571 572 attr.type = PERF_TYPE_SOFTWARE; 573 attr.config = PERF_COUNT_SW_TASK_CLOCK; 574 575 force_again: 576 fd = sys_perf_event_open(&attr, 0, -1, -1, 577 perf_event_open_cloexec_flag()); 578 579 if (fd < 0) { 580 if (errno == EMFILE) { 581 if (sched->force) { 582 BUG_ON(getrlimit(RLIMIT_NOFILE, &limit) == -1); 583 limit.rlim_cur += sched->nr_tasks - cur_task; 584 if (limit.rlim_cur > limit.rlim_max) { 585 limit.rlim_max = limit.rlim_cur; 586 need_privilege = true; 587 } 588 if (setrlimit(RLIMIT_NOFILE, &limit) == -1) { 589 if (need_privilege && errno == EPERM) 590 strcpy(info, "Need privilege\n"); 591 } else 592 goto force_again; 593 } else 594 strcpy(info, "Have a try with -f option\n"); 595 } 596 pr_err("Error: sys_perf_event_open() syscall returned " 597 "with %d (%s)\n%s", fd, 598 str_error_r(errno, sbuf, sizeof(sbuf)), info); 599 exit(EXIT_FAILURE); 600 } 601 return fd; 602 } 603 604 static u64 get_cpu_usage_nsec_self(int fd) 605 { 606 u64 runtime; 607 int ret; 608 609 ret = read(fd, &runtime, sizeof(runtime)); 610 BUG_ON(ret != sizeof(runtime)); 611 612 return runtime; 613 } 614 615 struct sched_thread_parms { 616 struct task_desc *task; 617 struct perf_sched *sched; 618 int fd; 619 }; 620 621 static void *thread_func(void *ctx) 622 { 623 struct sched_thread_parms *parms = ctx; 624 struct task_desc *this_task = parms->task; 625 struct perf_sched *sched = parms->sched; 626 u64 cpu_usage_0, cpu_usage_1; 627 unsigned long i, ret; 628 char comm2[22]; 629 int fd = parms->fd; 630 631 zfree(&parms); 632 633 sprintf(comm2, ":%s", this_task->comm); 634 prctl(PR_SET_NAME, comm2); 635 if (fd < 0) 636 return NULL; 637 638 while (!sched->thread_funcs_exit) { 639 ret = sem_post(&this_task->ready_for_work); 640 BUG_ON(ret); 641 mutex_lock(&sched->start_work_mutex); 642 mutex_unlock(&sched->start_work_mutex); 643 644 cpu_usage_0 = get_cpu_usage_nsec_self(fd); 645 646 for (i = 0; i < this_task->nr_events; i++) { 647 this_task->curr_event = i; 648 perf_sched__process_event(sched, this_task->atoms[i]); 649 } 650 651 cpu_usage_1 = get_cpu_usage_nsec_self(fd); 652 this_task->cpu_usage = cpu_usage_1 - cpu_usage_0; 653 ret = sem_post(&this_task->work_done_sem); 654 BUG_ON(ret); 655 656 mutex_lock(&sched->work_done_wait_mutex); 657 mutex_unlock(&sched->work_done_wait_mutex); 658 } 659 return NULL; 660 } 661 662 static void create_tasks(struct perf_sched *sched) 663 EXCLUSIVE_LOCK_FUNCTION(sched->start_work_mutex) 664 EXCLUSIVE_LOCK_FUNCTION(sched->work_done_wait_mutex) 665 { 666 struct task_desc *task; 667 pthread_attr_t attr; 668 unsigned long i; 669 int err; 670 671 err = pthread_attr_init(&attr); 672 BUG_ON(err); 673 err = pthread_attr_setstacksize(&attr, 674 (size_t) max(16 * 1024, (int)PTHREAD_STACK_MIN)); 675 BUG_ON(err); 676 mutex_lock(&sched->start_work_mutex); 677 mutex_lock(&sched->work_done_wait_mutex); 678 for (i = 0; i < sched->nr_tasks; i++) { 679 struct sched_thread_parms *parms = malloc(sizeof(*parms)); 680 BUG_ON(parms == NULL); 681 parms->task = task = sched->tasks[i]; 682 parms->sched = sched; 683 parms->fd = self_open_counters(sched, i); 684 sem_init(&task->sleep_sem, 0, 0); 685 sem_init(&task->ready_for_work, 0, 0); 686 sem_init(&task->work_done_sem, 0, 0); 687 task->curr_event = 0; 688 err = pthread_create(&task->thread, &attr, thread_func, parms); 689 BUG_ON(err); 690 } 691 } 692 693 static void destroy_tasks(struct perf_sched *sched) 694 UNLOCK_FUNCTION(sched->start_work_mutex) 695 UNLOCK_FUNCTION(sched->work_done_wait_mutex) 696 { 697 struct task_desc *task; 698 unsigned long i; 699 int err; 700 701 mutex_unlock(&sched->start_work_mutex); 702 mutex_unlock(&sched->work_done_wait_mutex); 703 /* Get rid of threads so they won't be upset by mutex destrunction */ 704 for (i = 0; i < sched->nr_tasks; i++) { 705 task = sched->tasks[i]; 706 err = pthread_join(task->thread, NULL); 707 BUG_ON(err); 708 sem_destroy(&task->sleep_sem); 709 sem_destroy(&task->ready_for_work); 710 sem_destroy(&task->work_done_sem); 711 } 712 } 713 714 static void wait_for_tasks(struct perf_sched *sched) 715 EXCLUSIVE_LOCKS_REQUIRED(sched->work_done_wait_mutex) 716 EXCLUSIVE_LOCKS_REQUIRED(sched->start_work_mutex) 717 { 718 u64 cpu_usage_0, cpu_usage_1; 719 struct task_desc *task; 720 unsigned long i, ret; 721 722 sched->start_time = get_nsecs(); 723 sched->cpu_usage = 0; 724 mutex_unlock(&sched->work_done_wait_mutex); 725 726 for (i = 0; i < sched->nr_tasks; i++) { 727 task = sched->tasks[i]; 728 ret = sem_wait(&task->ready_for_work); 729 BUG_ON(ret); 730 sem_init(&task->ready_for_work, 0, 0); 731 } 732 mutex_lock(&sched->work_done_wait_mutex); 733 734 cpu_usage_0 = get_cpu_usage_nsec_parent(); 735 736 mutex_unlock(&sched->start_work_mutex); 737 738 for (i = 0; i < sched->nr_tasks; i++) { 739 task = sched->tasks[i]; 740 ret = sem_wait(&task->work_done_sem); 741 BUG_ON(ret); 742 sem_init(&task->work_done_sem, 0, 0); 743 sched->cpu_usage += task->cpu_usage; 744 task->cpu_usage = 0; 745 } 746 747 cpu_usage_1 = get_cpu_usage_nsec_parent(); 748 if (!sched->runavg_cpu_usage) 749 sched->runavg_cpu_usage = sched->cpu_usage; 750 sched->runavg_cpu_usage = (sched->runavg_cpu_usage * (sched->replay_repeat - 1) + sched->cpu_usage) / sched->replay_repeat; 751 752 sched->parent_cpu_usage = cpu_usage_1 - cpu_usage_0; 753 if (!sched->runavg_parent_cpu_usage) 754 sched->runavg_parent_cpu_usage = sched->parent_cpu_usage; 755 sched->runavg_parent_cpu_usage = (sched->runavg_parent_cpu_usage * (sched->replay_repeat - 1) + 756 sched->parent_cpu_usage)/sched->replay_repeat; 757 758 mutex_lock(&sched->start_work_mutex); 759 760 for (i = 0; i < sched->nr_tasks; i++) { 761 task = sched->tasks[i]; 762 sem_init(&task->sleep_sem, 0, 0); 763 task->curr_event = 0; 764 } 765 } 766 767 static void run_one_test(struct perf_sched *sched) 768 EXCLUSIVE_LOCKS_REQUIRED(sched->work_done_wait_mutex) 769 EXCLUSIVE_LOCKS_REQUIRED(sched->start_work_mutex) 770 { 771 u64 T0, T1, delta, avg_delta, fluct; 772 773 T0 = get_nsecs(); 774 wait_for_tasks(sched); 775 T1 = get_nsecs(); 776 777 delta = T1 - T0; 778 sched->sum_runtime += delta; 779 sched->nr_runs++; 780 781 avg_delta = sched->sum_runtime / sched->nr_runs; 782 if (delta < avg_delta) 783 fluct = avg_delta - delta; 784 else 785 fluct = delta - avg_delta; 786 sched->sum_fluct += fluct; 787 if (!sched->run_avg) 788 sched->run_avg = delta; 789 sched->run_avg = (sched->run_avg * (sched->replay_repeat - 1) + delta) / sched->replay_repeat; 790 791 printf("#%-3ld: %0.3f, ", sched->nr_runs, (double)delta / NSEC_PER_MSEC); 792 793 printf("ravg: %0.2f, ", (double)sched->run_avg / NSEC_PER_MSEC); 794 795 printf("cpu: %0.2f / %0.2f", 796 (double)sched->cpu_usage / NSEC_PER_MSEC, (double)sched->runavg_cpu_usage / NSEC_PER_MSEC); 797 798 #if 0 799 /* 800 * rusage statistics done by the parent, these are less 801 * accurate than the sched->sum_exec_runtime based statistics: 802 */ 803 printf(" [%0.2f / %0.2f]", 804 (double)sched->parent_cpu_usage / NSEC_PER_MSEC, 805 (double)sched->runavg_parent_cpu_usage / NSEC_PER_MSEC); 806 #endif 807 808 printf("\n"); 809 810 if (sched->nr_sleep_corrections) 811 printf(" (%ld sleep corrections)\n", sched->nr_sleep_corrections); 812 sched->nr_sleep_corrections = 0; 813 } 814 815 static void test_calibrations(struct perf_sched *sched) 816 { 817 u64 T0, T1; 818 819 T0 = get_nsecs(); 820 burn_nsecs(sched, NSEC_PER_MSEC); 821 T1 = get_nsecs(); 822 823 printf("the run test took %" PRIu64 " nsecs\n", T1 - T0); 824 825 T0 = get_nsecs(); 826 sleep_nsecs(NSEC_PER_MSEC); 827 T1 = get_nsecs(); 828 829 printf("the sleep test took %" PRIu64 " nsecs\n", T1 - T0); 830 } 831 832 static int 833 replay_wakeup_event(struct perf_sched *sched, 834 struct evsel *evsel, struct perf_sample *sample, 835 struct machine *machine __maybe_unused) 836 { 837 const char *comm = evsel__strval(evsel, sample, "comm"); 838 const u32 pid = evsel__intval(evsel, sample, "pid"); 839 struct task_desc *waker, *wakee; 840 841 if (verbose > 0) { 842 printf("sched_wakeup event %p\n", evsel); 843 844 printf(" ... pid %d woke up %s/%d\n", sample->tid, comm, pid); 845 } 846 847 waker = register_pid(sched, sample->tid, "<unknown>"); 848 wakee = register_pid(sched, pid, comm); 849 850 add_sched_event_wakeup(sched, waker, sample->time, wakee); 851 return 0; 852 } 853 854 static int replay_switch_event(struct perf_sched *sched, 855 struct evsel *evsel, 856 struct perf_sample *sample, 857 struct machine *machine __maybe_unused) 858 { 859 const char *prev_comm = evsel__strval(evsel, sample, "prev_comm"), 860 *next_comm = evsel__strval(evsel, sample, "next_comm"); 861 const u32 prev_pid = evsel__intval(evsel, sample, "prev_pid"), 862 next_pid = evsel__intval(evsel, sample, "next_pid"); 863 const u64 prev_state = evsel__intval(evsel, sample, "prev_state"); 864 struct task_desc *prev, __maybe_unused *next; 865 u64 timestamp0, timestamp = sample->time; 866 int cpu = sample->cpu; 867 s64 delta; 868 869 if (verbose > 0) 870 printf("sched_switch event %p\n", evsel); 871 872 if (cpu >= MAX_CPUS || cpu < 0) 873 return 0; 874 875 timestamp0 = sched->cpu_last_switched[cpu]; 876 if (timestamp0) 877 delta = timestamp - timestamp0; 878 else 879 delta = 0; 880 881 if (delta < 0) { 882 pr_err("hm, delta: %" PRIu64 " < 0 ?\n", delta); 883 return -1; 884 } 885 886 pr_debug(" ... switch from %s/%d to %s/%d [ran %" PRIu64 " nsecs]\n", 887 prev_comm, prev_pid, next_comm, next_pid, delta); 888 889 prev = register_pid(sched, prev_pid, prev_comm); 890 next = register_pid(sched, next_pid, next_comm); 891 892 sched->cpu_last_switched[cpu] = timestamp; 893 894 add_sched_event_run(sched, prev, timestamp, delta); 895 add_sched_event_sleep(sched, prev, timestamp, prev_state); 896 897 return 0; 898 } 899 900 static int replay_fork_event(struct perf_sched *sched, 901 union perf_event *event, 902 struct machine *machine) 903 { 904 struct thread *child, *parent; 905 906 child = machine__findnew_thread(machine, event->fork.pid, 907 event->fork.tid); 908 parent = machine__findnew_thread(machine, event->fork.ppid, 909 event->fork.ptid); 910 911 if (child == NULL || parent == NULL) { 912 pr_debug("thread does not exist on fork event: child %p, parent %p\n", 913 child, parent); 914 goto out_put; 915 } 916 917 if (verbose > 0) { 918 printf("fork event\n"); 919 printf("... parent: %s/%d\n", thread__comm_str(parent), parent->tid); 920 printf("... child: %s/%d\n", thread__comm_str(child), child->tid); 921 } 922 923 register_pid(sched, parent->tid, thread__comm_str(parent)); 924 register_pid(sched, child->tid, thread__comm_str(child)); 925 out_put: 926 thread__put(child); 927 thread__put(parent); 928 return 0; 929 } 930 931 struct sort_dimension { 932 const char *name; 933 sort_fn_t cmp; 934 struct list_head list; 935 }; 936 937 /* 938 * handle runtime stats saved per thread 939 */ 940 static struct thread_runtime *thread__init_runtime(struct thread *thread) 941 { 942 struct thread_runtime *r; 943 944 r = zalloc(sizeof(struct thread_runtime)); 945 if (!r) 946 return NULL; 947 948 init_stats(&r->run_stats); 949 thread__set_priv(thread, r); 950 951 return r; 952 } 953 954 static struct thread_runtime *thread__get_runtime(struct thread *thread) 955 { 956 struct thread_runtime *tr; 957 958 tr = thread__priv(thread); 959 if (tr == NULL) { 960 tr = thread__init_runtime(thread); 961 if (tr == NULL) 962 pr_debug("Failed to malloc memory for runtime data.\n"); 963 } 964 965 return tr; 966 } 967 968 static int 969 thread_lat_cmp(struct list_head *list, struct work_atoms *l, struct work_atoms *r) 970 { 971 struct sort_dimension *sort; 972 int ret = 0; 973 974 BUG_ON(list_empty(list)); 975 976 list_for_each_entry(sort, list, list) { 977 ret = sort->cmp(l, r); 978 if (ret) 979 return ret; 980 } 981 982 return ret; 983 } 984 985 static struct work_atoms * 986 thread_atoms_search(struct rb_root_cached *root, struct thread *thread, 987 struct list_head *sort_list) 988 { 989 struct rb_node *node = root->rb_root.rb_node; 990 struct work_atoms key = { .thread = thread }; 991 992 while (node) { 993 struct work_atoms *atoms; 994 int cmp; 995 996 atoms = container_of(node, struct work_atoms, node); 997 998 cmp = thread_lat_cmp(sort_list, &key, atoms); 999 if (cmp > 0) 1000 node = node->rb_left; 1001 else if (cmp < 0) 1002 node = node->rb_right; 1003 else { 1004 BUG_ON(thread != atoms->thread); 1005 return atoms; 1006 } 1007 } 1008 return NULL; 1009 } 1010 1011 static void 1012 __thread_latency_insert(struct rb_root_cached *root, struct work_atoms *data, 1013 struct list_head *sort_list) 1014 { 1015 struct rb_node **new = &(root->rb_root.rb_node), *parent = NULL; 1016 bool leftmost = true; 1017 1018 while (*new) { 1019 struct work_atoms *this; 1020 int cmp; 1021 1022 this = container_of(*new, struct work_atoms, node); 1023 parent = *new; 1024 1025 cmp = thread_lat_cmp(sort_list, data, this); 1026 1027 if (cmp > 0) 1028 new = &((*new)->rb_left); 1029 else { 1030 new = &((*new)->rb_right); 1031 leftmost = false; 1032 } 1033 } 1034 1035 rb_link_node(&data->node, parent, new); 1036 rb_insert_color_cached(&data->node, root, leftmost); 1037 } 1038 1039 static int thread_atoms_insert(struct perf_sched *sched, struct thread *thread) 1040 { 1041 struct work_atoms *atoms = zalloc(sizeof(*atoms)); 1042 if (!atoms) { 1043 pr_err("No memory at %s\n", __func__); 1044 return -1; 1045 } 1046 1047 atoms->thread = thread__get(thread); 1048 INIT_LIST_HEAD(&atoms->work_list); 1049 __thread_latency_insert(&sched->atom_root, atoms, &sched->cmp_pid); 1050 return 0; 1051 } 1052 1053 static char sched_out_state(u64 prev_state) 1054 { 1055 const char *str = TASK_STATE_TO_CHAR_STR; 1056 1057 return str[prev_state]; 1058 } 1059 1060 static int 1061 add_sched_out_event(struct work_atoms *atoms, 1062 char run_state, 1063 u64 timestamp) 1064 { 1065 struct work_atom *atom = zalloc(sizeof(*atom)); 1066 if (!atom) { 1067 pr_err("Non memory at %s", __func__); 1068 return -1; 1069 } 1070 1071 atom->sched_out_time = timestamp; 1072 1073 if (run_state == 'R') { 1074 atom->state = THREAD_WAIT_CPU; 1075 atom->wake_up_time = atom->sched_out_time; 1076 } 1077 1078 list_add_tail(&atom->list, &atoms->work_list); 1079 return 0; 1080 } 1081 1082 static void 1083 add_runtime_event(struct work_atoms *atoms, u64 delta, 1084 u64 timestamp __maybe_unused) 1085 { 1086 struct work_atom *atom; 1087 1088 BUG_ON(list_empty(&atoms->work_list)); 1089 1090 atom = list_entry(atoms->work_list.prev, struct work_atom, list); 1091 1092 atom->runtime += delta; 1093 atoms->total_runtime += delta; 1094 } 1095 1096 static void 1097 add_sched_in_event(struct work_atoms *atoms, u64 timestamp) 1098 { 1099 struct work_atom *atom; 1100 u64 delta; 1101 1102 if (list_empty(&atoms->work_list)) 1103 return; 1104 1105 atom = list_entry(atoms->work_list.prev, struct work_atom, list); 1106 1107 if (atom->state != THREAD_WAIT_CPU) 1108 return; 1109 1110 if (timestamp < atom->wake_up_time) { 1111 atom->state = THREAD_IGNORE; 1112 return; 1113 } 1114 1115 atom->state = THREAD_SCHED_IN; 1116 atom->sched_in_time = timestamp; 1117 1118 delta = atom->sched_in_time - atom->wake_up_time; 1119 atoms->total_lat += delta; 1120 if (delta > atoms->max_lat) { 1121 atoms->max_lat = delta; 1122 atoms->max_lat_start = atom->wake_up_time; 1123 atoms->max_lat_end = timestamp; 1124 } 1125 atoms->nb_atoms++; 1126 } 1127 1128 static int latency_switch_event(struct perf_sched *sched, 1129 struct evsel *evsel, 1130 struct perf_sample *sample, 1131 struct machine *machine) 1132 { 1133 const u32 prev_pid = evsel__intval(evsel, sample, "prev_pid"), 1134 next_pid = evsel__intval(evsel, sample, "next_pid"); 1135 const u64 prev_state = evsel__intval(evsel, sample, "prev_state"); 1136 struct work_atoms *out_events, *in_events; 1137 struct thread *sched_out, *sched_in; 1138 u64 timestamp0, timestamp = sample->time; 1139 int cpu = sample->cpu, err = -1; 1140 s64 delta; 1141 1142 BUG_ON(cpu >= MAX_CPUS || cpu < 0); 1143 1144 timestamp0 = sched->cpu_last_switched[cpu]; 1145 sched->cpu_last_switched[cpu] = timestamp; 1146 if (timestamp0) 1147 delta = timestamp - timestamp0; 1148 else 1149 delta = 0; 1150 1151 if (delta < 0) { 1152 pr_err("hm, delta: %" PRIu64 " < 0 ?\n", delta); 1153 return -1; 1154 } 1155 1156 sched_out = machine__findnew_thread(machine, -1, prev_pid); 1157 sched_in = machine__findnew_thread(machine, -1, next_pid); 1158 if (sched_out == NULL || sched_in == NULL) 1159 goto out_put; 1160 1161 out_events = thread_atoms_search(&sched->atom_root, sched_out, &sched->cmp_pid); 1162 if (!out_events) { 1163 if (thread_atoms_insert(sched, sched_out)) 1164 goto out_put; 1165 out_events = thread_atoms_search(&sched->atom_root, sched_out, &sched->cmp_pid); 1166 if (!out_events) { 1167 pr_err("out-event: Internal tree error"); 1168 goto out_put; 1169 } 1170 } 1171 if (add_sched_out_event(out_events, sched_out_state(prev_state), timestamp)) 1172 return -1; 1173 1174 in_events = thread_atoms_search(&sched->atom_root, sched_in, &sched->cmp_pid); 1175 if (!in_events) { 1176 if (thread_atoms_insert(sched, sched_in)) 1177 goto out_put; 1178 in_events = thread_atoms_search(&sched->atom_root, sched_in, &sched->cmp_pid); 1179 if (!in_events) { 1180 pr_err("in-event: Internal tree error"); 1181 goto out_put; 1182 } 1183 /* 1184 * Take came in we have not heard about yet, 1185 * add in an initial atom in runnable state: 1186 */ 1187 if (add_sched_out_event(in_events, 'R', timestamp)) 1188 goto out_put; 1189 } 1190 add_sched_in_event(in_events, timestamp); 1191 err = 0; 1192 out_put: 1193 thread__put(sched_out); 1194 thread__put(sched_in); 1195 return err; 1196 } 1197 1198 static int latency_runtime_event(struct perf_sched *sched, 1199 struct evsel *evsel, 1200 struct perf_sample *sample, 1201 struct machine *machine) 1202 { 1203 const u32 pid = evsel__intval(evsel, sample, "pid"); 1204 const u64 runtime = evsel__intval(evsel, sample, "runtime"); 1205 struct thread *thread = machine__findnew_thread(machine, -1, pid); 1206 struct work_atoms *atoms = thread_atoms_search(&sched->atom_root, thread, &sched->cmp_pid); 1207 u64 timestamp = sample->time; 1208 int cpu = sample->cpu, err = -1; 1209 1210 if (thread == NULL) 1211 return -1; 1212 1213 BUG_ON(cpu >= MAX_CPUS || cpu < 0); 1214 if (!atoms) { 1215 if (thread_atoms_insert(sched, thread)) 1216 goto out_put; 1217 atoms = thread_atoms_search(&sched->atom_root, thread, &sched->cmp_pid); 1218 if (!atoms) { 1219 pr_err("in-event: Internal tree error"); 1220 goto out_put; 1221 } 1222 if (add_sched_out_event(atoms, 'R', timestamp)) 1223 goto out_put; 1224 } 1225 1226 add_runtime_event(atoms, runtime, timestamp); 1227 err = 0; 1228 out_put: 1229 thread__put(thread); 1230 return err; 1231 } 1232 1233 static int latency_wakeup_event(struct perf_sched *sched, 1234 struct evsel *evsel, 1235 struct perf_sample *sample, 1236 struct machine *machine) 1237 { 1238 const u32 pid = evsel__intval(evsel, sample, "pid"); 1239 struct work_atoms *atoms; 1240 struct work_atom *atom; 1241 struct thread *wakee; 1242 u64 timestamp = sample->time; 1243 int err = -1; 1244 1245 wakee = machine__findnew_thread(machine, -1, pid); 1246 if (wakee == NULL) 1247 return -1; 1248 atoms = thread_atoms_search(&sched->atom_root, wakee, &sched->cmp_pid); 1249 if (!atoms) { 1250 if (thread_atoms_insert(sched, wakee)) 1251 goto out_put; 1252 atoms = thread_atoms_search(&sched->atom_root, wakee, &sched->cmp_pid); 1253 if (!atoms) { 1254 pr_err("wakeup-event: Internal tree error"); 1255 goto out_put; 1256 } 1257 if (add_sched_out_event(atoms, 'S', timestamp)) 1258 goto out_put; 1259 } 1260 1261 BUG_ON(list_empty(&atoms->work_list)); 1262 1263 atom = list_entry(atoms->work_list.prev, struct work_atom, list); 1264 1265 /* 1266 * As we do not guarantee the wakeup event happens when 1267 * task is out of run queue, also may happen when task is 1268 * on run queue and wakeup only change ->state to TASK_RUNNING, 1269 * then we should not set the ->wake_up_time when wake up a 1270 * task which is on run queue. 1271 * 1272 * You WILL be missing events if you've recorded only 1273 * one CPU, or are only looking at only one, so don't 1274 * skip in this case. 1275 */ 1276 if (sched->profile_cpu == -1 && atom->state != THREAD_SLEEPING) 1277 goto out_ok; 1278 1279 sched->nr_timestamps++; 1280 if (atom->sched_out_time > timestamp) { 1281 sched->nr_unordered_timestamps++; 1282 goto out_ok; 1283 } 1284 1285 atom->state = THREAD_WAIT_CPU; 1286 atom->wake_up_time = timestamp; 1287 out_ok: 1288 err = 0; 1289 out_put: 1290 thread__put(wakee); 1291 return err; 1292 } 1293 1294 static int latency_migrate_task_event(struct perf_sched *sched, 1295 struct evsel *evsel, 1296 struct perf_sample *sample, 1297 struct machine *machine) 1298 { 1299 const u32 pid = evsel__intval(evsel, sample, "pid"); 1300 u64 timestamp = sample->time; 1301 struct work_atoms *atoms; 1302 struct work_atom *atom; 1303 struct thread *migrant; 1304 int err = -1; 1305 1306 /* 1307 * Only need to worry about migration when profiling one CPU. 1308 */ 1309 if (sched->profile_cpu == -1) 1310 return 0; 1311 1312 migrant = machine__findnew_thread(machine, -1, pid); 1313 if (migrant == NULL) 1314 return -1; 1315 atoms = thread_atoms_search(&sched->atom_root, migrant, &sched->cmp_pid); 1316 if (!atoms) { 1317 if (thread_atoms_insert(sched, migrant)) 1318 goto out_put; 1319 register_pid(sched, migrant->tid, thread__comm_str(migrant)); 1320 atoms = thread_atoms_search(&sched->atom_root, migrant, &sched->cmp_pid); 1321 if (!atoms) { 1322 pr_err("migration-event: Internal tree error"); 1323 goto out_put; 1324 } 1325 if (add_sched_out_event(atoms, 'R', timestamp)) 1326 goto out_put; 1327 } 1328 1329 BUG_ON(list_empty(&atoms->work_list)); 1330 1331 atom = list_entry(atoms->work_list.prev, struct work_atom, list); 1332 atom->sched_in_time = atom->sched_out_time = atom->wake_up_time = timestamp; 1333 1334 sched->nr_timestamps++; 1335 1336 if (atom->sched_out_time > timestamp) 1337 sched->nr_unordered_timestamps++; 1338 err = 0; 1339 out_put: 1340 thread__put(migrant); 1341 return err; 1342 } 1343 1344 static void output_lat_thread(struct perf_sched *sched, struct work_atoms *work_list) 1345 { 1346 int i; 1347 int ret; 1348 u64 avg; 1349 char max_lat_start[32], max_lat_end[32]; 1350 1351 if (!work_list->nb_atoms) 1352 return; 1353 /* 1354 * Ignore idle threads: 1355 */ 1356 if (!strcmp(thread__comm_str(work_list->thread), "swapper")) 1357 return; 1358 1359 sched->all_runtime += work_list->total_runtime; 1360 sched->all_count += work_list->nb_atoms; 1361 1362 if (work_list->num_merged > 1) 1363 ret = printf(" %s:(%d) ", thread__comm_str(work_list->thread), work_list->num_merged); 1364 else 1365 ret = printf(" %s:%d ", thread__comm_str(work_list->thread), work_list->thread->tid); 1366 1367 for (i = 0; i < 24 - ret; i++) 1368 printf(" "); 1369 1370 avg = work_list->total_lat / work_list->nb_atoms; 1371 timestamp__scnprintf_usec(work_list->max_lat_start, max_lat_start, sizeof(max_lat_start)); 1372 timestamp__scnprintf_usec(work_list->max_lat_end, max_lat_end, sizeof(max_lat_end)); 1373 1374 printf("|%11.3f ms |%9" PRIu64 " | avg:%8.3f ms | max:%8.3f ms | max start: %12s s | max end: %12s s\n", 1375 (double)work_list->total_runtime / NSEC_PER_MSEC, 1376 work_list->nb_atoms, (double)avg / NSEC_PER_MSEC, 1377 (double)work_list->max_lat / NSEC_PER_MSEC, 1378 max_lat_start, max_lat_end); 1379 } 1380 1381 static int pid_cmp(struct work_atoms *l, struct work_atoms *r) 1382 { 1383 if (l->thread == r->thread) 1384 return 0; 1385 if (l->thread->tid < r->thread->tid) 1386 return -1; 1387 if (l->thread->tid > r->thread->tid) 1388 return 1; 1389 return (int)(l->thread - r->thread); 1390 } 1391 1392 static int avg_cmp(struct work_atoms *l, struct work_atoms *r) 1393 { 1394 u64 avgl, avgr; 1395 1396 if (!l->nb_atoms) 1397 return -1; 1398 1399 if (!r->nb_atoms) 1400 return 1; 1401 1402 avgl = l->total_lat / l->nb_atoms; 1403 avgr = r->total_lat / r->nb_atoms; 1404 1405 if (avgl < avgr) 1406 return -1; 1407 if (avgl > avgr) 1408 return 1; 1409 1410 return 0; 1411 } 1412 1413 static int max_cmp(struct work_atoms *l, struct work_atoms *r) 1414 { 1415 if (l->max_lat < r->max_lat) 1416 return -1; 1417 if (l->max_lat > r->max_lat) 1418 return 1; 1419 1420 return 0; 1421 } 1422 1423 static int switch_cmp(struct work_atoms *l, struct work_atoms *r) 1424 { 1425 if (l->nb_atoms < r->nb_atoms) 1426 return -1; 1427 if (l->nb_atoms > r->nb_atoms) 1428 return 1; 1429 1430 return 0; 1431 } 1432 1433 static int runtime_cmp(struct work_atoms *l, struct work_atoms *r) 1434 { 1435 if (l->total_runtime < r->total_runtime) 1436 return -1; 1437 if (l->total_runtime > r->total_runtime) 1438 return 1; 1439 1440 return 0; 1441 } 1442 1443 static int sort_dimension__add(const char *tok, struct list_head *list) 1444 { 1445 size_t i; 1446 static struct sort_dimension avg_sort_dimension = { 1447 .name = "avg", 1448 .cmp = avg_cmp, 1449 }; 1450 static struct sort_dimension max_sort_dimension = { 1451 .name = "max", 1452 .cmp = max_cmp, 1453 }; 1454 static struct sort_dimension pid_sort_dimension = { 1455 .name = "pid", 1456 .cmp = pid_cmp, 1457 }; 1458 static struct sort_dimension runtime_sort_dimension = { 1459 .name = "runtime", 1460 .cmp = runtime_cmp, 1461 }; 1462 static struct sort_dimension switch_sort_dimension = { 1463 .name = "switch", 1464 .cmp = switch_cmp, 1465 }; 1466 struct sort_dimension *available_sorts[] = { 1467 &pid_sort_dimension, 1468 &avg_sort_dimension, 1469 &max_sort_dimension, 1470 &switch_sort_dimension, 1471 &runtime_sort_dimension, 1472 }; 1473 1474 for (i = 0; i < ARRAY_SIZE(available_sorts); i++) { 1475 if (!strcmp(available_sorts[i]->name, tok)) { 1476 list_add_tail(&available_sorts[i]->list, list); 1477 1478 return 0; 1479 } 1480 } 1481 1482 return -1; 1483 } 1484 1485 static void perf_sched__sort_lat(struct perf_sched *sched) 1486 { 1487 struct rb_node *node; 1488 struct rb_root_cached *root = &sched->atom_root; 1489 again: 1490 for (;;) { 1491 struct work_atoms *data; 1492 node = rb_first_cached(root); 1493 if (!node) 1494 break; 1495 1496 rb_erase_cached(node, root); 1497 data = rb_entry(node, struct work_atoms, node); 1498 __thread_latency_insert(&sched->sorted_atom_root, data, &sched->sort_list); 1499 } 1500 if (root == &sched->atom_root) { 1501 root = &sched->merged_atom_root; 1502 goto again; 1503 } 1504 } 1505 1506 static int process_sched_wakeup_event(struct perf_tool *tool, 1507 struct evsel *evsel, 1508 struct perf_sample *sample, 1509 struct machine *machine) 1510 { 1511 struct perf_sched *sched = container_of(tool, struct perf_sched, tool); 1512 1513 if (sched->tp_handler->wakeup_event) 1514 return sched->tp_handler->wakeup_event(sched, evsel, sample, machine); 1515 1516 return 0; 1517 } 1518 1519 static int process_sched_wakeup_ignore(struct perf_tool *tool __maybe_unused, 1520 struct evsel *evsel __maybe_unused, 1521 struct perf_sample *sample __maybe_unused, 1522 struct machine *machine __maybe_unused) 1523 { 1524 return 0; 1525 } 1526 1527 union map_priv { 1528 void *ptr; 1529 bool color; 1530 }; 1531 1532 static bool thread__has_color(struct thread *thread) 1533 { 1534 union map_priv priv = { 1535 .ptr = thread__priv(thread), 1536 }; 1537 1538 return priv.color; 1539 } 1540 1541 static struct thread* 1542 map__findnew_thread(struct perf_sched *sched, struct machine *machine, pid_t pid, pid_t tid) 1543 { 1544 struct thread *thread = machine__findnew_thread(machine, pid, tid); 1545 union map_priv priv = { 1546 .color = false, 1547 }; 1548 1549 if (!sched->map.color_pids || !thread || thread__priv(thread)) 1550 return thread; 1551 1552 if (thread_map__has(sched->map.color_pids, tid)) 1553 priv.color = true; 1554 1555 thread__set_priv(thread, priv.ptr); 1556 return thread; 1557 } 1558 1559 static int map_switch_event(struct perf_sched *sched, struct evsel *evsel, 1560 struct perf_sample *sample, struct machine *machine) 1561 { 1562 const u32 next_pid = evsel__intval(evsel, sample, "next_pid"); 1563 struct thread *sched_in; 1564 struct thread_runtime *tr; 1565 int new_shortname; 1566 u64 timestamp0, timestamp = sample->time; 1567 s64 delta; 1568 int i; 1569 struct perf_cpu this_cpu = { 1570 .cpu = sample->cpu, 1571 }; 1572 int cpus_nr; 1573 bool new_cpu = false; 1574 const char *color = PERF_COLOR_NORMAL; 1575 char stimestamp[32]; 1576 1577 BUG_ON(this_cpu.cpu >= MAX_CPUS || this_cpu.cpu < 0); 1578 1579 if (this_cpu.cpu > sched->max_cpu.cpu) 1580 sched->max_cpu = this_cpu; 1581 1582 if (sched->map.comp) { 1583 cpus_nr = bitmap_weight(sched->map.comp_cpus_mask, MAX_CPUS); 1584 if (!__test_and_set_bit(this_cpu.cpu, sched->map.comp_cpus_mask)) { 1585 sched->map.comp_cpus[cpus_nr++] = this_cpu; 1586 new_cpu = true; 1587 } 1588 } else 1589 cpus_nr = sched->max_cpu.cpu; 1590 1591 timestamp0 = sched->cpu_last_switched[this_cpu.cpu]; 1592 sched->cpu_last_switched[this_cpu.cpu] = timestamp; 1593 if (timestamp0) 1594 delta = timestamp - timestamp0; 1595 else 1596 delta = 0; 1597 1598 if (delta < 0) { 1599 pr_err("hm, delta: %" PRIu64 " < 0 ?\n", delta); 1600 return -1; 1601 } 1602 1603 sched_in = map__findnew_thread(sched, machine, -1, next_pid); 1604 if (sched_in == NULL) 1605 return -1; 1606 1607 tr = thread__get_runtime(sched_in); 1608 if (tr == NULL) { 1609 thread__put(sched_in); 1610 return -1; 1611 } 1612 1613 sched->curr_thread[this_cpu.cpu] = thread__get(sched_in); 1614 1615 printf(" "); 1616 1617 new_shortname = 0; 1618 if (!tr->shortname[0]) { 1619 if (!strcmp(thread__comm_str(sched_in), "swapper")) { 1620 /* 1621 * Don't allocate a letter-number for swapper:0 1622 * as a shortname. Instead, we use '.' for it. 1623 */ 1624 tr->shortname[0] = '.'; 1625 tr->shortname[1] = ' '; 1626 } else { 1627 tr->shortname[0] = sched->next_shortname1; 1628 tr->shortname[1] = sched->next_shortname2; 1629 1630 if (sched->next_shortname1 < 'Z') { 1631 sched->next_shortname1++; 1632 } else { 1633 sched->next_shortname1 = 'A'; 1634 if (sched->next_shortname2 < '9') 1635 sched->next_shortname2++; 1636 else 1637 sched->next_shortname2 = '0'; 1638 } 1639 } 1640 new_shortname = 1; 1641 } 1642 1643 for (i = 0; i < cpus_nr; i++) { 1644 struct perf_cpu cpu = { 1645 .cpu = sched->map.comp ? sched->map.comp_cpus[i].cpu : i, 1646 }; 1647 struct thread *curr_thread = sched->curr_thread[cpu.cpu]; 1648 struct thread_runtime *curr_tr; 1649 const char *pid_color = color; 1650 const char *cpu_color = color; 1651 1652 if (curr_thread && thread__has_color(curr_thread)) 1653 pid_color = COLOR_PIDS; 1654 1655 if (sched->map.cpus && !perf_cpu_map__has(sched->map.cpus, cpu)) 1656 continue; 1657 1658 if (sched->map.color_cpus && perf_cpu_map__has(sched->map.color_cpus, cpu)) 1659 cpu_color = COLOR_CPUS; 1660 1661 if (cpu.cpu != this_cpu.cpu) 1662 color_fprintf(stdout, color, " "); 1663 else 1664 color_fprintf(stdout, cpu_color, "*"); 1665 1666 if (sched->curr_thread[cpu.cpu]) { 1667 curr_tr = thread__get_runtime(sched->curr_thread[cpu.cpu]); 1668 if (curr_tr == NULL) { 1669 thread__put(sched_in); 1670 return -1; 1671 } 1672 color_fprintf(stdout, pid_color, "%2s ", curr_tr->shortname); 1673 } else 1674 color_fprintf(stdout, color, " "); 1675 } 1676 1677 if (sched->map.cpus && !perf_cpu_map__has(sched->map.cpus, this_cpu)) 1678 goto out; 1679 1680 timestamp__scnprintf_usec(timestamp, stimestamp, sizeof(stimestamp)); 1681 color_fprintf(stdout, color, " %12s secs ", stimestamp); 1682 if (new_shortname || tr->comm_changed || (verbose > 0 && sched_in->tid)) { 1683 const char *pid_color = color; 1684 1685 if (thread__has_color(sched_in)) 1686 pid_color = COLOR_PIDS; 1687 1688 color_fprintf(stdout, pid_color, "%s => %s:%d", 1689 tr->shortname, thread__comm_str(sched_in), sched_in->tid); 1690 tr->comm_changed = false; 1691 } 1692 1693 if (sched->map.comp && new_cpu) 1694 color_fprintf(stdout, color, " (CPU %d)", this_cpu); 1695 1696 out: 1697 color_fprintf(stdout, color, "\n"); 1698 1699 thread__put(sched_in); 1700 1701 return 0; 1702 } 1703 1704 static int process_sched_switch_event(struct perf_tool *tool, 1705 struct evsel *evsel, 1706 struct perf_sample *sample, 1707 struct machine *machine) 1708 { 1709 struct perf_sched *sched = container_of(tool, struct perf_sched, tool); 1710 int this_cpu = sample->cpu, err = 0; 1711 u32 prev_pid = evsel__intval(evsel, sample, "prev_pid"), 1712 next_pid = evsel__intval(evsel, sample, "next_pid"); 1713 1714 if (sched->curr_pid[this_cpu] != (u32)-1) { 1715 /* 1716 * Are we trying to switch away a PID that is 1717 * not current? 1718 */ 1719 if (sched->curr_pid[this_cpu] != prev_pid) 1720 sched->nr_context_switch_bugs++; 1721 } 1722 1723 if (sched->tp_handler->switch_event) 1724 err = sched->tp_handler->switch_event(sched, evsel, sample, machine); 1725 1726 sched->curr_pid[this_cpu] = next_pid; 1727 return err; 1728 } 1729 1730 static int process_sched_runtime_event(struct perf_tool *tool, 1731 struct evsel *evsel, 1732 struct perf_sample *sample, 1733 struct machine *machine) 1734 { 1735 struct perf_sched *sched = container_of(tool, struct perf_sched, tool); 1736 1737 if (sched->tp_handler->runtime_event) 1738 return sched->tp_handler->runtime_event(sched, evsel, sample, machine); 1739 1740 return 0; 1741 } 1742 1743 static int perf_sched__process_fork_event(struct perf_tool *tool, 1744 union perf_event *event, 1745 struct perf_sample *sample, 1746 struct machine *machine) 1747 { 1748 struct perf_sched *sched = container_of(tool, struct perf_sched, tool); 1749 1750 /* run the fork event through the perf machinery */ 1751 perf_event__process_fork(tool, event, sample, machine); 1752 1753 /* and then run additional processing needed for this command */ 1754 if (sched->tp_handler->fork_event) 1755 return sched->tp_handler->fork_event(sched, event, machine); 1756 1757 return 0; 1758 } 1759 1760 static int process_sched_migrate_task_event(struct perf_tool *tool, 1761 struct evsel *evsel, 1762 struct perf_sample *sample, 1763 struct machine *machine) 1764 { 1765 struct perf_sched *sched = container_of(tool, struct perf_sched, tool); 1766 1767 if (sched->tp_handler->migrate_task_event) 1768 return sched->tp_handler->migrate_task_event(sched, evsel, sample, machine); 1769 1770 return 0; 1771 } 1772 1773 typedef int (*tracepoint_handler)(struct perf_tool *tool, 1774 struct evsel *evsel, 1775 struct perf_sample *sample, 1776 struct machine *machine); 1777 1778 static int perf_sched__process_tracepoint_sample(struct perf_tool *tool __maybe_unused, 1779 union perf_event *event __maybe_unused, 1780 struct perf_sample *sample, 1781 struct evsel *evsel, 1782 struct machine *machine) 1783 { 1784 int err = 0; 1785 1786 if (evsel->handler != NULL) { 1787 tracepoint_handler f = evsel->handler; 1788 err = f(tool, evsel, sample, machine); 1789 } 1790 1791 return err; 1792 } 1793 1794 static int perf_sched__process_comm(struct perf_tool *tool __maybe_unused, 1795 union perf_event *event, 1796 struct perf_sample *sample, 1797 struct machine *machine) 1798 { 1799 struct thread *thread; 1800 struct thread_runtime *tr; 1801 int err; 1802 1803 err = perf_event__process_comm(tool, event, sample, machine); 1804 if (err) 1805 return err; 1806 1807 thread = machine__find_thread(machine, sample->pid, sample->tid); 1808 if (!thread) { 1809 pr_err("Internal error: can't find thread\n"); 1810 return -1; 1811 } 1812 1813 tr = thread__get_runtime(thread); 1814 if (tr == NULL) { 1815 thread__put(thread); 1816 return -1; 1817 } 1818 1819 tr->comm_changed = true; 1820 thread__put(thread); 1821 1822 return 0; 1823 } 1824 1825 static int perf_sched__read_events(struct perf_sched *sched) 1826 { 1827 struct evsel_str_handler handlers[] = { 1828 { "sched:sched_switch", process_sched_switch_event, }, 1829 { "sched:sched_stat_runtime", process_sched_runtime_event, }, 1830 { "sched:sched_wakeup", process_sched_wakeup_event, }, 1831 { "sched:sched_waking", process_sched_wakeup_event, }, 1832 { "sched:sched_wakeup_new", process_sched_wakeup_event, }, 1833 { "sched:sched_migrate_task", process_sched_migrate_task_event, }, 1834 }; 1835 struct perf_session *session; 1836 struct perf_data data = { 1837 .path = input_name, 1838 .mode = PERF_DATA_MODE_READ, 1839 .force = sched->force, 1840 }; 1841 int rc = -1; 1842 1843 session = perf_session__new(&data, &sched->tool); 1844 if (IS_ERR(session)) { 1845 pr_debug("Error creating perf session"); 1846 return PTR_ERR(session); 1847 } 1848 1849 symbol__init(&session->header.env); 1850 1851 /* prefer sched_waking if it is captured */ 1852 if (evlist__find_tracepoint_by_name(session->evlist, "sched:sched_waking")) 1853 handlers[2].handler = process_sched_wakeup_ignore; 1854 1855 if (perf_session__set_tracepoints_handlers(session, handlers)) 1856 goto out_delete; 1857 1858 if (perf_session__has_traces(session, "record -R")) { 1859 int err = perf_session__process_events(session); 1860 if (err) { 1861 pr_err("Failed to process events, error %d", err); 1862 goto out_delete; 1863 } 1864 1865 sched->nr_events = session->evlist->stats.nr_events[0]; 1866 sched->nr_lost_events = session->evlist->stats.total_lost; 1867 sched->nr_lost_chunks = session->evlist->stats.nr_events[PERF_RECORD_LOST]; 1868 } 1869 1870 rc = 0; 1871 out_delete: 1872 perf_session__delete(session); 1873 return rc; 1874 } 1875 1876 /* 1877 * scheduling times are printed as msec.usec 1878 */ 1879 static inline void print_sched_time(unsigned long long nsecs, int width) 1880 { 1881 unsigned long msecs; 1882 unsigned long usecs; 1883 1884 msecs = nsecs / NSEC_PER_MSEC; 1885 nsecs -= msecs * NSEC_PER_MSEC; 1886 usecs = nsecs / NSEC_PER_USEC; 1887 printf("%*lu.%03lu ", width, msecs, usecs); 1888 } 1889 1890 /* 1891 * returns runtime data for event, allocating memory for it the 1892 * first time it is used. 1893 */ 1894 static struct evsel_runtime *evsel__get_runtime(struct evsel *evsel) 1895 { 1896 struct evsel_runtime *r = evsel->priv; 1897 1898 if (r == NULL) { 1899 r = zalloc(sizeof(struct evsel_runtime)); 1900 evsel->priv = r; 1901 } 1902 1903 return r; 1904 } 1905 1906 /* 1907 * save last time event was seen per cpu 1908 */ 1909 static void evsel__save_time(struct evsel *evsel, u64 timestamp, u32 cpu) 1910 { 1911 struct evsel_runtime *r = evsel__get_runtime(evsel); 1912 1913 if (r == NULL) 1914 return; 1915 1916 if ((cpu >= r->ncpu) || (r->last_time == NULL)) { 1917 int i, n = __roundup_pow_of_two(cpu+1); 1918 void *p = r->last_time; 1919 1920 p = realloc(r->last_time, n * sizeof(u64)); 1921 if (!p) 1922 return; 1923 1924 r->last_time = p; 1925 for (i = r->ncpu; i < n; ++i) 1926 r->last_time[i] = (u64) 0; 1927 1928 r->ncpu = n; 1929 } 1930 1931 r->last_time[cpu] = timestamp; 1932 } 1933 1934 /* returns last time this event was seen on the given cpu */ 1935 static u64 evsel__get_time(struct evsel *evsel, u32 cpu) 1936 { 1937 struct evsel_runtime *r = evsel__get_runtime(evsel); 1938 1939 if ((r == NULL) || (r->last_time == NULL) || (cpu >= r->ncpu)) 1940 return 0; 1941 1942 return r->last_time[cpu]; 1943 } 1944 1945 static int comm_width = 30; 1946 1947 static char *timehist_get_commstr(struct thread *thread) 1948 { 1949 static char str[32]; 1950 const char *comm = thread__comm_str(thread); 1951 pid_t tid = thread->tid; 1952 pid_t pid = thread->pid_; 1953 int n; 1954 1955 if (pid == 0) 1956 n = scnprintf(str, sizeof(str), "%s", comm); 1957 1958 else if (tid != pid) 1959 n = scnprintf(str, sizeof(str), "%s[%d/%d]", comm, tid, pid); 1960 1961 else 1962 n = scnprintf(str, sizeof(str), "%s[%d]", comm, tid); 1963 1964 if (n > comm_width) 1965 comm_width = n; 1966 1967 return str; 1968 } 1969 1970 static void timehist_header(struct perf_sched *sched) 1971 { 1972 u32 ncpus = sched->max_cpu.cpu + 1; 1973 u32 i, j; 1974 1975 printf("%15s %6s ", "time", "cpu"); 1976 1977 if (sched->show_cpu_visual) { 1978 printf(" "); 1979 for (i = 0, j = 0; i < ncpus; ++i) { 1980 printf("%x", j++); 1981 if (j > 15) 1982 j = 0; 1983 } 1984 printf(" "); 1985 } 1986 1987 printf(" %-*s %9s %9s %9s", comm_width, 1988 "task name", "wait time", "sch delay", "run time"); 1989 1990 if (sched->show_state) 1991 printf(" %s", "state"); 1992 1993 printf("\n"); 1994 1995 /* 1996 * units row 1997 */ 1998 printf("%15s %-6s ", "", ""); 1999 2000 if (sched->show_cpu_visual) 2001 printf(" %*s ", ncpus, ""); 2002 2003 printf(" %-*s %9s %9s %9s", comm_width, 2004 "[tid/pid]", "(msec)", "(msec)", "(msec)"); 2005 2006 if (sched->show_state) 2007 printf(" %5s", ""); 2008 2009 printf("\n"); 2010 2011 /* 2012 * separator 2013 */ 2014 printf("%.15s %.6s ", graph_dotted_line, graph_dotted_line); 2015 2016 if (sched->show_cpu_visual) 2017 printf(" %.*s ", ncpus, graph_dotted_line); 2018 2019 printf(" %.*s %.9s %.9s %.9s", comm_width, 2020 graph_dotted_line, graph_dotted_line, graph_dotted_line, 2021 graph_dotted_line); 2022 2023 if (sched->show_state) 2024 printf(" %.5s", graph_dotted_line); 2025 2026 printf("\n"); 2027 } 2028 2029 static char task_state_char(struct thread *thread, int state) 2030 { 2031 static const char state_to_char[] = TASK_STATE_TO_CHAR_STR; 2032 unsigned bit = state ? ffs(state) : 0; 2033 2034 /* 'I' for idle */ 2035 if (thread->tid == 0) 2036 return 'I'; 2037 2038 return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?'; 2039 } 2040 2041 static void timehist_print_sample(struct perf_sched *sched, 2042 struct evsel *evsel, 2043 struct perf_sample *sample, 2044 struct addr_location *al, 2045 struct thread *thread, 2046 u64 t, int state) 2047 { 2048 struct thread_runtime *tr = thread__priv(thread); 2049 const char *next_comm = evsel__strval(evsel, sample, "next_comm"); 2050 const u32 next_pid = evsel__intval(evsel, sample, "next_pid"); 2051 u32 max_cpus = sched->max_cpu.cpu + 1; 2052 char tstr[64]; 2053 char nstr[30]; 2054 u64 wait_time; 2055 2056 if (cpu_list && !test_bit(sample->cpu, cpu_bitmap)) 2057 return; 2058 2059 timestamp__scnprintf_usec(t, tstr, sizeof(tstr)); 2060 printf("%15s [%04d] ", tstr, sample->cpu); 2061 2062 if (sched->show_cpu_visual) { 2063 u32 i; 2064 char c; 2065 2066 printf(" "); 2067 for (i = 0; i < max_cpus; ++i) { 2068 /* flag idle times with 'i'; others are sched events */ 2069 if (i == sample->cpu) 2070 c = (thread->tid == 0) ? 'i' : 's'; 2071 else 2072 c = ' '; 2073 printf("%c", c); 2074 } 2075 printf(" "); 2076 } 2077 2078 printf(" %-*s ", comm_width, timehist_get_commstr(thread)); 2079 2080 wait_time = tr->dt_sleep + tr->dt_iowait + tr->dt_preempt; 2081 print_sched_time(wait_time, 6); 2082 2083 print_sched_time(tr->dt_delay, 6); 2084 print_sched_time(tr->dt_run, 6); 2085 2086 if (sched->show_state) 2087 printf(" %5c ", task_state_char(thread, state)); 2088 2089 if (sched->show_next) { 2090 snprintf(nstr, sizeof(nstr), "next: %s[%d]", next_comm, next_pid); 2091 printf(" %-*s", comm_width, nstr); 2092 } 2093 2094 if (sched->show_wakeups && !sched->show_next) 2095 printf(" %-*s", comm_width, ""); 2096 2097 if (thread->tid == 0) 2098 goto out; 2099 2100 if (sched->show_callchain) 2101 printf(" "); 2102 2103 sample__fprintf_sym(sample, al, 0, 2104 EVSEL__PRINT_SYM | EVSEL__PRINT_ONELINE | 2105 EVSEL__PRINT_CALLCHAIN_ARROW | 2106 EVSEL__PRINT_SKIP_IGNORED, 2107 &callchain_cursor, symbol_conf.bt_stop_list, stdout); 2108 2109 out: 2110 printf("\n"); 2111 } 2112 2113 /* 2114 * Explanation of delta-time stats: 2115 * 2116 * t = time of current schedule out event 2117 * tprev = time of previous sched out event 2118 * also time of schedule-in event for current task 2119 * last_time = time of last sched change event for current task 2120 * (i.e, time process was last scheduled out) 2121 * ready_to_run = time of wakeup for current task 2122 * 2123 * -----|------------|------------|------------|------ 2124 * last ready tprev t 2125 * time to run 2126 * 2127 * |-------- dt_wait --------| 2128 * |- dt_delay -|-- dt_run --| 2129 * 2130 * dt_run = run time of current task 2131 * dt_wait = time between last schedule out event for task and tprev 2132 * represents time spent off the cpu 2133 * dt_delay = time between wakeup and schedule-in of task 2134 */ 2135 2136 static void timehist_update_runtime_stats(struct thread_runtime *r, 2137 u64 t, u64 tprev) 2138 { 2139 r->dt_delay = 0; 2140 r->dt_sleep = 0; 2141 r->dt_iowait = 0; 2142 r->dt_preempt = 0; 2143 r->dt_run = 0; 2144 2145 if (tprev) { 2146 r->dt_run = t - tprev; 2147 if (r->ready_to_run) { 2148 if (r->ready_to_run > tprev) 2149 pr_debug("time travel: wakeup time for task > previous sched_switch event\n"); 2150 else 2151 r->dt_delay = tprev - r->ready_to_run; 2152 } 2153 2154 if (r->last_time > tprev) 2155 pr_debug("time travel: last sched out time for task > previous sched_switch event\n"); 2156 else if (r->last_time) { 2157 u64 dt_wait = tprev - r->last_time; 2158 2159 if (r->last_state == TASK_RUNNING) 2160 r->dt_preempt = dt_wait; 2161 else if (r->last_state == TASK_UNINTERRUPTIBLE) 2162 r->dt_iowait = dt_wait; 2163 else 2164 r->dt_sleep = dt_wait; 2165 } 2166 } 2167 2168 update_stats(&r->run_stats, r->dt_run); 2169 2170 r->total_run_time += r->dt_run; 2171 r->total_delay_time += r->dt_delay; 2172 r->total_sleep_time += r->dt_sleep; 2173 r->total_iowait_time += r->dt_iowait; 2174 r->total_preempt_time += r->dt_preempt; 2175 } 2176 2177 static bool is_idle_sample(struct perf_sample *sample, 2178 struct evsel *evsel) 2179 { 2180 /* pid 0 == swapper == idle task */ 2181 if (strcmp(evsel__name(evsel), "sched:sched_switch") == 0) 2182 return evsel__intval(evsel, sample, "prev_pid") == 0; 2183 2184 return sample->pid == 0; 2185 } 2186 2187 static void save_task_callchain(struct perf_sched *sched, 2188 struct perf_sample *sample, 2189 struct evsel *evsel, 2190 struct machine *machine) 2191 { 2192 struct callchain_cursor *cursor = &callchain_cursor; 2193 struct thread *thread; 2194 2195 /* want main thread for process - has maps */ 2196 thread = machine__findnew_thread(machine, sample->pid, sample->pid); 2197 if (thread == NULL) { 2198 pr_debug("Failed to get thread for pid %d.\n", sample->pid); 2199 return; 2200 } 2201 2202 if (!sched->show_callchain || sample->callchain == NULL) 2203 return; 2204 2205 if (thread__resolve_callchain(thread, cursor, evsel, sample, 2206 NULL, NULL, sched->max_stack + 2) != 0) { 2207 if (verbose > 0) 2208 pr_err("Failed to resolve callchain. Skipping\n"); 2209 2210 return; 2211 } 2212 2213 callchain_cursor_commit(cursor); 2214 2215 while (true) { 2216 struct callchain_cursor_node *node; 2217 struct symbol *sym; 2218 2219 node = callchain_cursor_current(cursor); 2220 if (node == NULL) 2221 break; 2222 2223 sym = node->ms.sym; 2224 if (sym) { 2225 if (!strcmp(sym->name, "schedule") || 2226 !strcmp(sym->name, "__schedule") || 2227 !strcmp(sym->name, "preempt_schedule")) 2228 sym->ignore = 1; 2229 } 2230 2231 callchain_cursor_advance(cursor); 2232 } 2233 } 2234 2235 static int init_idle_thread(struct thread *thread) 2236 { 2237 struct idle_thread_runtime *itr; 2238 2239 thread__set_comm(thread, idle_comm, 0); 2240 2241 itr = zalloc(sizeof(*itr)); 2242 if (itr == NULL) 2243 return -ENOMEM; 2244 2245 init_stats(&itr->tr.run_stats); 2246 callchain_init(&itr->callchain); 2247 callchain_cursor_reset(&itr->cursor); 2248 thread__set_priv(thread, itr); 2249 2250 return 0; 2251 } 2252 2253 /* 2254 * Track idle stats per cpu by maintaining a local thread 2255 * struct for the idle task on each cpu. 2256 */ 2257 static int init_idle_threads(int ncpu) 2258 { 2259 int i, ret; 2260 2261 idle_threads = zalloc(ncpu * sizeof(struct thread *)); 2262 if (!idle_threads) 2263 return -ENOMEM; 2264 2265 idle_max_cpu = ncpu; 2266 2267 /* allocate the actual thread struct if needed */ 2268 for (i = 0; i < ncpu; ++i) { 2269 idle_threads[i] = thread__new(0, 0); 2270 if (idle_threads[i] == NULL) 2271 return -ENOMEM; 2272 2273 ret = init_idle_thread(idle_threads[i]); 2274 if (ret < 0) 2275 return ret; 2276 } 2277 2278 return 0; 2279 } 2280 2281 static void free_idle_threads(void) 2282 { 2283 int i; 2284 2285 if (idle_threads == NULL) 2286 return; 2287 2288 for (i = 0; i < idle_max_cpu; ++i) { 2289 if ((idle_threads[i])) 2290 thread__delete(idle_threads[i]); 2291 } 2292 2293 free(idle_threads); 2294 } 2295 2296 static struct thread *get_idle_thread(int cpu) 2297 { 2298 /* 2299 * expand/allocate array of pointers to local thread 2300 * structs if needed 2301 */ 2302 if ((cpu >= idle_max_cpu) || (idle_threads == NULL)) { 2303 int i, j = __roundup_pow_of_two(cpu+1); 2304 void *p; 2305 2306 p = realloc(idle_threads, j * sizeof(struct thread *)); 2307 if (!p) 2308 return NULL; 2309 2310 idle_threads = (struct thread **) p; 2311 for (i = idle_max_cpu; i < j; ++i) 2312 idle_threads[i] = NULL; 2313 2314 idle_max_cpu = j; 2315 } 2316 2317 /* allocate a new thread struct if needed */ 2318 if (idle_threads[cpu] == NULL) { 2319 idle_threads[cpu] = thread__new(0, 0); 2320 2321 if (idle_threads[cpu]) { 2322 if (init_idle_thread(idle_threads[cpu]) < 0) 2323 return NULL; 2324 } 2325 } 2326 2327 return idle_threads[cpu]; 2328 } 2329 2330 static void save_idle_callchain(struct perf_sched *sched, 2331 struct idle_thread_runtime *itr, 2332 struct perf_sample *sample) 2333 { 2334 if (!sched->show_callchain || sample->callchain == NULL) 2335 return; 2336 2337 callchain_cursor__copy(&itr->cursor, &callchain_cursor); 2338 } 2339 2340 static struct thread *timehist_get_thread(struct perf_sched *sched, 2341 struct perf_sample *sample, 2342 struct machine *machine, 2343 struct evsel *evsel) 2344 { 2345 struct thread *thread; 2346 2347 if (is_idle_sample(sample, evsel)) { 2348 thread = get_idle_thread(sample->cpu); 2349 if (thread == NULL) 2350 pr_err("Failed to get idle thread for cpu %d.\n", sample->cpu); 2351 2352 } else { 2353 /* there were samples with tid 0 but non-zero pid */ 2354 thread = machine__findnew_thread(machine, sample->pid, 2355 sample->tid ?: sample->pid); 2356 if (thread == NULL) { 2357 pr_debug("Failed to get thread for tid %d. skipping sample.\n", 2358 sample->tid); 2359 } 2360 2361 save_task_callchain(sched, sample, evsel, machine); 2362 if (sched->idle_hist) { 2363 struct thread *idle; 2364 struct idle_thread_runtime *itr; 2365 2366 idle = get_idle_thread(sample->cpu); 2367 if (idle == NULL) { 2368 pr_err("Failed to get idle thread for cpu %d.\n", sample->cpu); 2369 return NULL; 2370 } 2371 2372 itr = thread__priv(idle); 2373 if (itr == NULL) 2374 return NULL; 2375 2376 itr->last_thread = thread; 2377 2378 /* copy task callchain when entering to idle */ 2379 if (evsel__intval(evsel, sample, "next_pid") == 0) 2380 save_idle_callchain(sched, itr, sample); 2381 } 2382 } 2383 2384 return thread; 2385 } 2386 2387 static bool timehist_skip_sample(struct perf_sched *sched, 2388 struct thread *thread, 2389 struct evsel *evsel, 2390 struct perf_sample *sample) 2391 { 2392 bool rc = false; 2393 2394 if (thread__is_filtered(thread)) { 2395 rc = true; 2396 sched->skipped_samples++; 2397 } 2398 2399 if (sched->idle_hist) { 2400 if (strcmp(evsel__name(evsel), "sched:sched_switch")) 2401 rc = true; 2402 else if (evsel__intval(evsel, sample, "prev_pid") != 0 && 2403 evsel__intval(evsel, sample, "next_pid") != 0) 2404 rc = true; 2405 } 2406 2407 return rc; 2408 } 2409 2410 static void timehist_print_wakeup_event(struct perf_sched *sched, 2411 struct evsel *evsel, 2412 struct perf_sample *sample, 2413 struct machine *machine, 2414 struct thread *awakened) 2415 { 2416 struct thread *thread; 2417 char tstr[64]; 2418 2419 thread = machine__findnew_thread(machine, sample->pid, sample->tid); 2420 if (thread == NULL) 2421 return; 2422 2423 /* show wakeup unless both awakee and awaker are filtered */ 2424 if (timehist_skip_sample(sched, thread, evsel, sample) && 2425 timehist_skip_sample(sched, awakened, evsel, sample)) { 2426 return; 2427 } 2428 2429 timestamp__scnprintf_usec(sample->time, tstr, sizeof(tstr)); 2430 printf("%15s [%04d] ", tstr, sample->cpu); 2431 if (sched->show_cpu_visual) 2432 printf(" %*s ", sched->max_cpu.cpu + 1, ""); 2433 2434 printf(" %-*s ", comm_width, timehist_get_commstr(thread)); 2435 2436 /* dt spacer */ 2437 printf(" %9s %9s %9s ", "", "", ""); 2438 2439 printf("awakened: %s", timehist_get_commstr(awakened)); 2440 2441 printf("\n"); 2442 } 2443 2444 static int timehist_sched_wakeup_ignore(struct perf_tool *tool __maybe_unused, 2445 union perf_event *event __maybe_unused, 2446 struct evsel *evsel __maybe_unused, 2447 struct perf_sample *sample __maybe_unused, 2448 struct machine *machine __maybe_unused) 2449 { 2450 return 0; 2451 } 2452 2453 static int timehist_sched_wakeup_event(struct perf_tool *tool, 2454 union perf_event *event __maybe_unused, 2455 struct evsel *evsel, 2456 struct perf_sample *sample, 2457 struct machine *machine) 2458 { 2459 struct perf_sched *sched = container_of(tool, struct perf_sched, tool); 2460 struct thread *thread; 2461 struct thread_runtime *tr = NULL; 2462 /* want pid of awakened task not pid in sample */ 2463 const u32 pid = evsel__intval(evsel, sample, "pid"); 2464 2465 thread = machine__findnew_thread(machine, 0, pid); 2466 if (thread == NULL) 2467 return -1; 2468 2469 tr = thread__get_runtime(thread); 2470 if (tr == NULL) 2471 return -1; 2472 2473 if (tr->ready_to_run == 0) 2474 tr->ready_to_run = sample->time; 2475 2476 /* show wakeups if requested */ 2477 if (sched->show_wakeups && 2478 !perf_time__skip_sample(&sched->ptime, sample->time)) 2479 timehist_print_wakeup_event(sched, evsel, sample, machine, thread); 2480 2481 return 0; 2482 } 2483 2484 static void timehist_print_migration_event(struct perf_sched *sched, 2485 struct evsel *evsel, 2486 struct perf_sample *sample, 2487 struct machine *machine, 2488 struct thread *migrated) 2489 { 2490 struct thread *thread; 2491 char tstr[64]; 2492 u32 max_cpus; 2493 u32 ocpu, dcpu; 2494 2495 if (sched->summary_only) 2496 return; 2497 2498 max_cpus = sched->max_cpu.cpu + 1; 2499 ocpu = evsel__intval(evsel, sample, "orig_cpu"); 2500 dcpu = evsel__intval(evsel, sample, "dest_cpu"); 2501 2502 thread = machine__findnew_thread(machine, sample->pid, sample->tid); 2503 if (thread == NULL) 2504 return; 2505 2506 if (timehist_skip_sample(sched, thread, evsel, sample) && 2507 timehist_skip_sample(sched, migrated, evsel, sample)) { 2508 return; 2509 } 2510 2511 timestamp__scnprintf_usec(sample->time, tstr, sizeof(tstr)); 2512 printf("%15s [%04d] ", tstr, sample->cpu); 2513 2514 if (sched->show_cpu_visual) { 2515 u32 i; 2516 char c; 2517 2518 printf(" "); 2519 for (i = 0; i < max_cpus; ++i) { 2520 c = (i == sample->cpu) ? 'm' : ' '; 2521 printf("%c", c); 2522 } 2523 printf(" "); 2524 } 2525 2526 printf(" %-*s ", comm_width, timehist_get_commstr(thread)); 2527 2528 /* dt spacer */ 2529 printf(" %9s %9s %9s ", "", "", ""); 2530 2531 printf("migrated: %s", timehist_get_commstr(migrated)); 2532 printf(" cpu %d => %d", ocpu, dcpu); 2533 2534 printf("\n"); 2535 } 2536 2537 static int timehist_migrate_task_event(struct perf_tool *tool, 2538 union perf_event *event __maybe_unused, 2539 struct evsel *evsel, 2540 struct perf_sample *sample, 2541 struct machine *machine) 2542 { 2543 struct perf_sched *sched = container_of(tool, struct perf_sched, tool); 2544 struct thread *thread; 2545 struct thread_runtime *tr = NULL; 2546 /* want pid of migrated task not pid in sample */ 2547 const u32 pid = evsel__intval(evsel, sample, "pid"); 2548 2549 thread = machine__findnew_thread(machine, 0, pid); 2550 if (thread == NULL) 2551 return -1; 2552 2553 tr = thread__get_runtime(thread); 2554 if (tr == NULL) 2555 return -1; 2556 2557 tr->migrations++; 2558 2559 /* show migrations if requested */ 2560 timehist_print_migration_event(sched, evsel, sample, machine, thread); 2561 2562 return 0; 2563 } 2564 2565 static int timehist_sched_change_event(struct perf_tool *tool, 2566 union perf_event *event, 2567 struct evsel *evsel, 2568 struct perf_sample *sample, 2569 struct machine *machine) 2570 { 2571 struct perf_sched *sched = container_of(tool, struct perf_sched, tool); 2572 struct perf_time_interval *ptime = &sched->ptime; 2573 struct addr_location al; 2574 struct thread *thread; 2575 struct thread_runtime *tr = NULL; 2576 u64 tprev, t = sample->time; 2577 int rc = 0; 2578 int state = evsel__intval(evsel, sample, "prev_state"); 2579 2580 if (machine__resolve(machine, &al, sample) < 0) { 2581 pr_err("problem processing %d event. skipping it\n", 2582 event->header.type); 2583 rc = -1; 2584 goto out; 2585 } 2586 2587 thread = timehist_get_thread(sched, sample, machine, evsel); 2588 if (thread == NULL) { 2589 rc = -1; 2590 goto out; 2591 } 2592 2593 if (timehist_skip_sample(sched, thread, evsel, sample)) 2594 goto out; 2595 2596 tr = thread__get_runtime(thread); 2597 if (tr == NULL) { 2598 rc = -1; 2599 goto out; 2600 } 2601 2602 tprev = evsel__get_time(evsel, sample->cpu); 2603 2604 /* 2605 * If start time given: 2606 * - sample time is under window user cares about - skip sample 2607 * - tprev is under window user cares about - reset to start of window 2608 */ 2609 if (ptime->start && ptime->start > t) 2610 goto out; 2611 2612 if (tprev && ptime->start > tprev) 2613 tprev = ptime->start; 2614 2615 /* 2616 * If end time given: 2617 * - previous sched event is out of window - we are done 2618 * - sample time is beyond window user cares about - reset it 2619 * to close out stats for time window interest 2620 */ 2621 if (ptime->end) { 2622 if (tprev > ptime->end) 2623 goto out; 2624 2625 if (t > ptime->end) 2626 t = ptime->end; 2627 } 2628 2629 if (!sched->idle_hist || thread->tid == 0) { 2630 if (!cpu_list || test_bit(sample->cpu, cpu_bitmap)) 2631 timehist_update_runtime_stats(tr, t, tprev); 2632 2633 if (sched->idle_hist) { 2634 struct idle_thread_runtime *itr = (void *)tr; 2635 struct thread_runtime *last_tr; 2636 2637 BUG_ON(thread->tid != 0); 2638 2639 if (itr->last_thread == NULL) 2640 goto out; 2641 2642 /* add current idle time as last thread's runtime */ 2643 last_tr = thread__get_runtime(itr->last_thread); 2644 if (last_tr == NULL) 2645 goto out; 2646 2647 timehist_update_runtime_stats(last_tr, t, tprev); 2648 /* 2649 * remove delta time of last thread as it's not updated 2650 * and otherwise it will show an invalid value next 2651 * time. we only care total run time and run stat. 2652 */ 2653 last_tr->dt_run = 0; 2654 last_tr->dt_delay = 0; 2655 last_tr->dt_sleep = 0; 2656 last_tr->dt_iowait = 0; 2657 last_tr->dt_preempt = 0; 2658 2659 if (itr->cursor.nr) 2660 callchain_append(&itr->callchain, &itr->cursor, t - tprev); 2661 2662 itr->last_thread = NULL; 2663 } 2664 } 2665 2666 if (!sched->summary_only) 2667 timehist_print_sample(sched, evsel, sample, &al, thread, t, state); 2668 2669 out: 2670 if (sched->hist_time.start == 0 && t >= ptime->start) 2671 sched->hist_time.start = t; 2672 if (ptime->end == 0 || t <= ptime->end) 2673 sched->hist_time.end = t; 2674 2675 if (tr) { 2676 /* time of this sched_switch event becomes last time task seen */ 2677 tr->last_time = sample->time; 2678 2679 /* last state is used to determine where to account wait time */ 2680 tr->last_state = state; 2681 2682 /* sched out event for task so reset ready to run time */ 2683 tr->ready_to_run = 0; 2684 } 2685 2686 evsel__save_time(evsel, sample->time, sample->cpu); 2687 2688 return rc; 2689 } 2690 2691 static int timehist_sched_switch_event(struct perf_tool *tool, 2692 union perf_event *event, 2693 struct evsel *evsel, 2694 struct perf_sample *sample, 2695 struct machine *machine __maybe_unused) 2696 { 2697 return timehist_sched_change_event(tool, event, evsel, sample, machine); 2698 } 2699 2700 static int process_lost(struct perf_tool *tool __maybe_unused, 2701 union perf_event *event, 2702 struct perf_sample *sample, 2703 struct machine *machine __maybe_unused) 2704 { 2705 char tstr[64]; 2706 2707 timestamp__scnprintf_usec(sample->time, tstr, sizeof(tstr)); 2708 printf("%15s ", tstr); 2709 printf("lost %" PRI_lu64 " events on cpu %d\n", event->lost.lost, sample->cpu); 2710 2711 return 0; 2712 } 2713 2714 2715 static void print_thread_runtime(struct thread *t, 2716 struct thread_runtime *r) 2717 { 2718 double mean = avg_stats(&r->run_stats); 2719 float stddev; 2720 2721 printf("%*s %5d %9" PRIu64 " ", 2722 comm_width, timehist_get_commstr(t), t->ppid, 2723 (u64) r->run_stats.n); 2724 2725 print_sched_time(r->total_run_time, 8); 2726 stddev = rel_stddev_stats(stddev_stats(&r->run_stats), mean); 2727 print_sched_time(r->run_stats.min, 6); 2728 printf(" "); 2729 print_sched_time((u64) mean, 6); 2730 printf(" "); 2731 print_sched_time(r->run_stats.max, 6); 2732 printf(" "); 2733 printf("%5.2f", stddev); 2734 printf(" %5" PRIu64, r->migrations); 2735 printf("\n"); 2736 } 2737 2738 static void print_thread_waittime(struct thread *t, 2739 struct thread_runtime *r) 2740 { 2741 printf("%*s %5d %9" PRIu64 " ", 2742 comm_width, timehist_get_commstr(t), t->ppid, 2743 (u64) r->run_stats.n); 2744 2745 print_sched_time(r->total_run_time, 8); 2746 print_sched_time(r->total_sleep_time, 6); 2747 printf(" "); 2748 print_sched_time(r->total_iowait_time, 6); 2749 printf(" "); 2750 print_sched_time(r->total_preempt_time, 6); 2751 printf(" "); 2752 print_sched_time(r->total_delay_time, 6); 2753 printf("\n"); 2754 } 2755 2756 struct total_run_stats { 2757 struct perf_sched *sched; 2758 u64 sched_count; 2759 u64 task_count; 2760 u64 total_run_time; 2761 }; 2762 2763 static int __show_thread_runtime(struct thread *t, void *priv) 2764 { 2765 struct total_run_stats *stats = priv; 2766 struct thread_runtime *r; 2767 2768 if (thread__is_filtered(t)) 2769 return 0; 2770 2771 r = thread__priv(t); 2772 if (r && r->run_stats.n) { 2773 stats->task_count++; 2774 stats->sched_count += r->run_stats.n; 2775 stats->total_run_time += r->total_run_time; 2776 2777 if (stats->sched->show_state) 2778 print_thread_waittime(t, r); 2779 else 2780 print_thread_runtime(t, r); 2781 } 2782 2783 return 0; 2784 } 2785 2786 static int show_thread_runtime(struct thread *t, void *priv) 2787 { 2788 if (t->dead) 2789 return 0; 2790 2791 return __show_thread_runtime(t, priv); 2792 } 2793 2794 static int show_deadthread_runtime(struct thread *t, void *priv) 2795 { 2796 if (!t->dead) 2797 return 0; 2798 2799 return __show_thread_runtime(t, priv); 2800 } 2801 2802 static size_t callchain__fprintf_folded(FILE *fp, struct callchain_node *node) 2803 { 2804 const char *sep = " <- "; 2805 struct callchain_list *chain; 2806 size_t ret = 0; 2807 char bf[1024]; 2808 bool first; 2809 2810 if (node == NULL) 2811 return 0; 2812 2813 ret = callchain__fprintf_folded(fp, node->parent); 2814 first = (ret == 0); 2815 2816 list_for_each_entry(chain, &node->val, list) { 2817 if (chain->ip >= PERF_CONTEXT_MAX) 2818 continue; 2819 if (chain->ms.sym && chain->ms.sym->ignore) 2820 continue; 2821 ret += fprintf(fp, "%s%s", first ? "" : sep, 2822 callchain_list__sym_name(chain, bf, sizeof(bf), 2823 false)); 2824 first = false; 2825 } 2826 2827 return ret; 2828 } 2829 2830 static size_t timehist_print_idlehist_callchain(struct rb_root_cached *root) 2831 { 2832 size_t ret = 0; 2833 FILE *fp = stdout; 2834 struct callchain_node *chain; 2835 struct rb_node *rb_node = rb_first_cached(root); 2836 2837 printf(" %16s %8s %s\n", "Idle time (msec)", "Count", "Callchains"); 2838 printf(" %.16s %.8s %.50s\n", graph_dotted_line, graph_dotted_line, 2839 graph_dotted_line); 2840 2841 while (rb_node) { 2842 chain = rb_entry(rb_node, struct callchain_node, rb_node); 2843 rb_node = rb_next(rb_node); 2844 2845 ret += fprintf(fp, " "); 2846 print_sched_time(chain->hit, 12); 2847 ret += 16; /* print_sched_time returns 2nd arg + 4 */ 2848 ret += fprintf(fp, " %8d ", chain->count); 2849 ret += callchain__fprintf_folded(fp, chain); 2850 ret += fprintf(fp, "\n"); 2851 } 2852 2853 return ret; 2854 } 2855 2856 static void timehist_print_summary(struct perf_sched *sched, 2857 struct perf_session *session) 2858 { 2859 struct machine *m = &session->machines.host; 2860 struct total_run_stats totals; 2861 u64 task_count; 2862 struct thread *t; 2863 struct thread_runtime *r; 2864 int i; 2865 u64 hist_time = sched->hist_time.end - sched->hist_time.start; 2866 2867 memset(&totals, 0, sizeof(totals)); 2868 totals.sched = sched; 2869 2870 if (sched->idle_hist) { 2871 printf("\nIdle-time summary\n"); 2872 printf("%*s parent sched-out ", comm_width, "comm"); 2873 printf(" idle-time min-idle avg-idle max-idle stddev migrations\n"); 2874 } else if (sched->show_state) { 2875 printf("\nWait-time summary\n"); 2876 printf("%*s parent sched-in ", comm_width, "comm"); 2877 printf(" run-time sleep iowait preempt delay\n"); 2878 } else { 2879 printf("\nRuntime summary\n"); 2880 printf("%*s parent sched-in ", comm_width, "comm"); 2881 printf(" run-time min-run avg-run max-run stddev migrations\n"); 2882 } 2883 printf("%*s (count) ", comm_width, ""); 2884 printf(" (msec) (msec) (msec) (msec) %s\n", 2885 sched->show_state ? "(msec)" : "%"); 2886 printf("%.117s\n", graph_dotted_line); 2887 2888 machine__for_each_thread(m, show_thread_runtime, &totals); 2889 task_count = totals.task_count; 2890 if (!task_count) 2891 printf("<no still running tasks>\n"); 2892 2893 printf("\nTerminated tasks:\n"); 2894 machine__for_each_thread(m, show_deadthread_runtime, &totals); 2895 if (task_count == totals.task_count) 2896 printf("<no terminated tasks>\n"); 2897 2898 /* CPU idle stats not tracked when samples were skipped */ 2899 if (sched->skipped_samples && !sched->idle_hist) 2900 return; 2901 2902 printf("\nIdle stats:\n"); 2903 for (i = 0; i < idle_max_cpu; ++i) { 2904 if (cpu_list && !test_bit(i, cpu_bitmap)) 2905 continue; 2906 2907 t = idle_threads[i]; 2908 if (!t) 2909 continue; 2910 2911 r = thread__priv(t); 2912 if (r && r->run_stats.n) { 2913 totals.sched_count += r->run_stats.n; 2914 printf(" CPU %2d idle for ", i); 2915 print_sched_time(r->total_run_time, 6); 2916 printf(" msec (%6.2f%%)\n", 100.0 * r->total_run_time / hist_time); 2917 } else 2918 printf(" CPU %2d idle entire time window\n", i); 2919 } 2920 2921 if (sched->idle_hist && sched->show_callchain) { 2922 callchain_param.mode = CHAIN_FOLDED; 2923 callchain_param.value = CCVAL_PERIOD; 2924 2925 callchain_register_param(&callchain_param); 2926 2927 printf("\nIdle stats by callchain:\n"); 2928 for (i = 0; i < idle_max_cpu; ++i) { 2929 struct idle_thread_runtime *itr; 2930 2931 t = idle_threads[i]; 2932 if (!t) 2933 continue; 2934 2935 itr = thread__priv(t); 2936 if (itr == NULL) 2937 continue; 2938 2939 callchain_param.sort(&itr->sorted_root.rb_root, &itr->callchain, 2940 0, &callchain_param); 2941 2942 printf(" CPU %2d:", i); 2943 print_sched_time(itr->tr.total_run_time, 6); 2944 printf(" msec\n"); 2945 timehist_print_idlehist_callchain(&itr->sorted_root); 2946 printf("\n"); 2947 } 2948 } 2949 2950 printf("\n" 2951 " Total number of unique tasks: %" PRIu64 "\n" 2952 "Total number of context switches: %" PRIu64 "\n", 2953 totals.task_count, totals.sched_count); 2954 2955 printf(" Total run time (msec): "); 2956 print_sched_time(totals.total_run_time, 2); 2957 printf("\n"); 2958 2959 printf(" Total scheduling time (msec): "); 2960 print_sched_time(hist_time, 2); 2961 printf(" (x %d)\n", sched->max_cpu.cpu); 2962 } 2963 2964 typedef int (*sched_handler)(struct perf_tool *tool, 2965 union perf_event *event, 2966 struct evsel *evsel, 2967 struct perf_sample *sample, 2968 struct machine *machine); 2969 2970 static int perf_timehist__process_sample(struct perf_tool *tool, 2971 union perf_event *event, 2972 struct perf_sample *sample, 2973 struct evsel *evsel, 2974 struct machine *machine) 2975 { 2976 struct perf_sched *sched = container_of(tool, struct perf_sched, tool); 2977 int err = 0; 2978 struct perf_cpu this_cpu = { 2979 .cpu = sample->cpu, 2980 }; 2981 2982 if (this_cpu.cpu > sched->max_cpu.cpu) 2983 sched->max_cpu = this_cpu; 2984 2985 if (evsel->handler != NULL) { 2986 sched_handler f = evsel->handler; 2987 2988 err = f(tool, event, evsel, sample, machine); 2989 } 2990 2991 return err; 2992 } 2993 2994 static int timehist_check_attr(struct perf_sched *sched, 2995 struct evlist *evlist) 2996 { 2997 struct evsel *evsel; 2998 struct evsel_runtime *er; 2999 3000 list_for_each_entry(evsel, &evlist->core.entries, core.node) { 3001 er = evsel__get_runtime(evsel); 3002 if (er == NULL) { 3003 pr_err("Failed to allocate memory for evsel runtime data\n"); 3004 return -1; 3005 } 3006 3007 if (sched->show_callchain && !evsel__has_callchain(evsel)) { 3008 pr_info("Samples do not have callchains.\n"); 3009 sched->show_callchain = 0; 3010 symbol_conf.use_callchain = 0; 3011 } 3012 } 3013 3014 return 0; 3015 } 3016 3017 static int perf_sched__timehist(struct perf_sched *sched) 3018 { 3019 struct evsel_str_handler handlers[] = { 3020 { "sched:sched_switch", timehist_sched_switch_event, }, 3021 { "sched:sched_wakeup", timehist_sched_wakeup_event, }, 3022 { "sched:sched_waking", timehist_sched_wakeup_event, }, 3023 { "sched:sched_wakeup_new", timehist_sched_wakeup_event, }, 3024 }; 3025 const struct evsel_str_handler migrate_handlers[] = { 3026 { "sched:sched_migrate_task", timehist_migrate_task_event, }, 3027 }; 3028 struct perf_data data = { 3029 .path = input_name, 3030 .mode = PERF_DATA_MODE_READ, 3031 .force = sched->force, 3032 }; 3033 3034 struct perf_session *session; 3035 struct evlist *evlist; 3036 int err = -1; 3037 3038 /* 3039 * event handlers for timehist option 3040 */ 3041 sched->tool.sample = perf_timehist__process_sample; 3042 sched->tool.mmap = perf_event__process_mmap; 3043 sched->tool.comm = perf_event__process_comm; 3044 sched->tool.exit = perf_event__process_exit; 3045 sched->tool.fork = perf_event__process_fork; 3046 sched->tool.lost = process_lost; 3047 sched->tool.attr = perf_event__process_attr; 3048 sched->tool.tracing_data = perf_event__process_tracing_data; 3049 sched->tool.build_id = perf_event__process_build_id; 3050 3051 sched->tool.ordered_events = true; 3052 sched->tool.ordering_requires_timestamps = true; 3053 3054 symbol_conf.use_callchain = sched->show_callchain; 3055 3056 session = perf_session__new(&data, &sched->tool); 3057 if (IS_ERR(session)) 3058 return PTR_ERR(session); 3059 3060 if (cpu_list) { 3061 err = perf_session__cpu_bitmap(session, cpu_list, cpu_bitmap); 3062 if (err < 0) 3063 goto out; 3064 } 3065 3066 evlist = session->evlist; 3067 3068 symbol__init(&session->header.env); 3069 3070 if (perf_time__parse_str(&sched->ptime, sched->time_str) != 0) { 3071 pr_err("Invalid time string\n"); 3072 return -EINVAL; 3073 } 3074 3075 if (timehist_check_attr(sched, evlist) != 0) 3076 goto out; 3077 3078 setup_pager(); 3079 3080 /* prefer sched_waking if it is captured */ 3081 if (evlist__find_tracepoint_by_name(session->evlist, "sched:sched_waking")) 3082 handlers[1].handler = timehist_sched_wakeup_ignore; 3083 3084 /* setup per-evsel handlers */ 3085 if (perf_session__set_tracepoints_handlers(session, handlers)) 3086 goto out; 3087 3088 /* sched_switch event at a minimum needs to exist */ 3089 if (!evlist__find_tracepoint_by_name(session->evlist, "sched:sched_switch")) { 3090 pr_err("No sched_switch events found. Have you run 'perf sched record'?\n"); 3091 goto out; 3092 } 3093 3094 if (sched->show_migrations && 3095 perf_session__set_tracepoints_handlers(session, migrate_handlers)) 3096 goto out; 3097 3098 /* pre-allocate struct for per-CPU idle stats */ 3099 sched->max_cpu.cpu = session->header.env.nr_cpus_online; 3100 if (sched->max_cpu.cpu == 0) 3101 sched->max_cpu.cpu = 4; 3102 if (init_idle_threads(sched->max_cpu.cpu)) 3103 goto out; 3104 3105 /* summary_only implies summary option, but don't overwrite summary if set */ 3106 if (sched->summary_only) 3107 sched->summary = sched->summary_only; 3108 3109 if (!sched->summary_only) 3110 timehist_header(sched); 3111 3112 err = perf_session__process_events(session); 3113 if (err) { 3114 pr_err("Failed to process events, error %d", err); 3115 goto out; 3116 } 3117 3118 sched->nr_events = evlist->stats.nr_events[0]; 3119 sched->nr_lost_events = evlist->stats.total_lost; 3120 sched->nr_lost_chunks = evlist->stats.nr_events[PERF_RECORD_LOST]; 3121 3122 if (sched->summary) 3123 timehist_print_summary(sched, session); 3124 3125 out: 3126 free_idle_threads(); 3127 perf_session__delete(session); 3128 3129 return err; 3130 } 3131 3132 3133 static void print_bad_events(struct perf_sched *sched) 3134 { 3135 if (sched->nr_unordered_timestamps && sched->nr_timestamps) { 3136 printf(" INFO: %.3f%% unordered timestamps (%ld out of %ld)\n", 3137 (double)sched->nr_unordered_timestamps/(double)sched->nr_timestamps*100.0, 3138 sched->nr_unordered_timestamps, sched->nr_timestamps); 3139 } 3140 if (sched->nr_lost_events && sched->nr_events) { 3141 printf(" INFO: %.3f%% lost events (%ld out of %ld, in %ld chunks)\n", 3142 (double)sched->nr_lost_events/(double)sched->nr_events * 100.0, 3143 sched->nr_lost_events, sched->nr_events, sched->nr_lost_chunks); 3144 } 3145 if (sched->nr_context_switch_bugs && sched->nr_timestamps) { 3146 printf(" INFO: %.3f%% context switch bugs (%ld out of %ld)", 3147 (double)sched->nr_context_switch_bugs/(double)sched->nr_timestamps*100.0, 3148 sched->nr_context_switch_bugs, sched->nr_timestamps); 3149 if (sched->nr_lost_events) 3150 printf(" (due to lost events?)"); 3151 printf("\n"); 3152 } 3153 } 3154 3155 static void __merge_work_atoms(struct rb_root_cached *root, struct work_atoms *data) 3156 { 3157 struct rb_node **new = &(root->rb_root.rb_node), *parent = NULL; 3158 struct work_atoms *this; 3159 const char *comm = thread__comm_str(data->thread), *this_comm; 3160 bool leftmost = true; 3161 3162 while (*new) { 3163 int cmp; 3164 3165 this = container_of(*new, struct work_atoms, node); 3166 parent = *new; 3167 3168 this_comm = thread__comm_str(this->thread); 3169 cmp = strcmp(comm, this_comm); 3170 if (cmp > 0) { 3171 new = &((*new)->rb_left); 3172 } else if (cmp < 0) { 3173 new = &((*new)->rb_right); 3174 leftmost = false; 3175 } else { 3176 this->num_merged++; 3177 this->total_runtime += data->total_runtime; 3178 this->nb_atoms += data->nb_atoms; 3179 this->total_lat += data->total_lat; 3180 list_splice(&data->work_list, &this->work_list); 3181 if (this->max_lat < data->max_lat) { 3182 this->max_lat = data->max_lat; 3183 this->max_lat_start = data->max_lat_start; 3184 this->max_lat_end = data->max_lat_end; 3185 } 3186 zfree(&data); 3187 return; 3188 } 3189 } 3190 3191 data->num_merged++; 3192 rb_link_node(&data->node, parent, new); 3193 rb_insert_color_cached(&data->node, root, leftmost); 3194 } 3195 3196 static void perf_sched__merge_lat(struct perf_sched *sched) 3197 { 3198 struct work_atoms *data; 3199 struct rb_node *node; 3200 3201 if (sched->skip_merge) 3202 return; 3203 3204 while ((node = rb_first_cached(&sched->atom_root))) { 3205 rb_erase_cached(node, &sched->atom_root); 3206 data = rb_entry(node, struct work_atoms, node); 3207 __merge_work_atoms(&sched->merged_atom_root, data); 3208 } 3209 } 3210 3211 static int perf_sched__lat(struct perf_sched *sched) 3212 { 3213 struct rb_node *next; 3214 3215 setup_pager(); 3216 3217 if (perf_sched__read_events(sched)) 3218 return -1; 3219 3220 perf_sched__merge_lat(sched); 3221 perf_sched__sort_lat(sched); 3222 3223 printf("\n -------------------------------------------------------------------------------------------------------------------------------------------\n"); 3224 printf(" Task | Runtime ms | Switches | Avg delay ms | Max delay ms | Max delay start | Max delay end |\n"); 3225 printf(" -------------------------------------------------------------------------------------------------------------------------------------------\n"); 3226 3227 next = rb_first_cached(&sched->sorted_atom_root); 3228 3229 while (next) { 3230 struct work_atoms *work_list; 3231 3232 work_list = rb_entry(next, struct work_atoms, node); 3233 output_lat_thread(sched, work_list); 3234 next = rb_next(next); 3235 thread__zput(work_list->thread); 3236 } 3237 3238 printf(" -----------------------------------------------------------------------------------------------------------------\n"); 3239 printf(" TOTAL: |%11.3f ms |%9" PRIu64 " |\n", 3240 (double)sched->all_runtime / NSEC_PER_MSEC, sched->all_count); 3241 3242 printf(" ---------------------------------------------------\n"); 3243 3244 print_bad_events(sched); 3245 printf("\n"); 3246 3247 return 0; 3248 } 3249 3250 static int setup_map_cpus(struct perf_sched *sched) 3251 { 3252 struct perf_cpu_map *map; 3253 3254 sched->max_cpu.cpu = sysconf(_SC_NPROCESSORS_CONF); 3255 3256 if (sched->map.comp) { 3257 sched->map.comp_cpus = zalloc(sched->max_cpu.cpu * sizeof(int)); 3258 if (!sched->map.comp_cpus) 3259 return -1; 3260 } 3261 3262 if (!sched->map.cpus_str) 3263 return 0; 3264 3265 map = perf_cpu_map__new(sched->map.cpus_str); 3266 if (!map) { 3267 pr_err("failed to get cpus map from %s\n", sched->map.cpus_str); 3268 return -1; 3269 } 3270 3271 sched->map.cpus = map; 3272 return 0; 3273 } 3274 3275 static int setup_color_pids(struct perf_sched *sched) 3276 { 3277 struct perf_thread_map *map; 3278 3279 if (!sched->map.color_pids_str) 3280 return 0; 3281 3282 map = thread_map__new_by_tid_str(sched->map.color_pids_str); 3283 if (!map) { 3284 pr_err("failed to get thread map from %s\n", sched->map.color_pids_str); 3285 return -1; 3286 } 3287 3288 sched->map.color_pids = map; 3289 return 0; 3290 } 3291 3292 static int setup_color_cpus(struct perf_sched *sched) 3293 { 3294 struct perf_cpu_map *map; 3295 3296 if (!sched->map.color_cpus_str) 3297 return 0; 3298 3299 map = perf_cpu_map__new(sched->map.color_cpus_str); 3300 if (!map) { 3301 pr_err("failed to get thread map from %s\n", sched->map.color_cpus_str); 3302 return -1; 3303 } 3304 3305 sched->map.color_cpus = map; 3306 return 0; 3307 } 3308 3309 static int perf_sched__map(struct perf_sched *sched) 3310 { 3311 if (setup_map_cpus(sched)) 3312 return -1; 3313 3314 if (setup_color_pids(sched)) 3315 return -1; 3316 3317 if (setup_color_cpus(sched)) 3318 return -1; 3319 3320 setup_pager(); 3321 if (perf_sched__read_events(sched)) 3322 return -1; 3323 print_bad_events(sched); 3324 return 0; 3325 } 3326 3327 static int perf_sched__replay(struct perf_sched *sched) 3328 { 3329 unsigned long i; 3330 3331 calibrate_run_measurement_overhead(sched); 3332 calibrate_sleep_measurement_overhead(sched); 3333 3334 test_calibrations(sched); 3335 3336 if (perf_sched__read_events(sched)) 3337 return -1; 3338 3339 printf("nr_run_events: %ld\n", sched->nr_run_events); 3340 printf("nr_sleep_events: %ld\n", sched->nr_sleep_events); 3341 printf("nr_wakeup_events: %ld\n", sched->nr_wakeup_events); 3342 3343 if (sched->targetless_wakeups) 3344 printf("target-less wakeups: %ld\n", sched->targetless_wakeups); 3345 if (sched->multitarget_wakeups) 3346 printf("multi-target wakeups: %ld\n", sched->multitarget_wakeups); 3347 if (sched->nr_run_events_optimized) 3348 printf("run atoms optimized: %ld\n", 3349 sched->nr_run_events_optimized); 3350 3351 print_task_traces(sched); 3352 add_cross_task_wakeups(sched); 3353 3354 sched->thread_funcs_exit = false; 3355 create_tasks(sched); 3356 printf("------------------------------------------------------------\n"); 3357 for (i = 0; i < sched->replay_repeat; i++) 3358 run_one_test(sched); 3359 3360 sched->thread_funcs_exit = true; 3361 destroy_tasks(sched); 3362 return 0; 3363 } 3364 3365 static void setup_sorting(struct perf_sched *sched, const struct option *options, 3366 const char * const usage_msg[]) 3367 { 3368 char *tmp, *tok, *str = strdup(sched->sort_order); 3369 3370 for (tok = strtok_r(str, ", ", &tmp); 3371 tok; tok = strtok_r(NULL, ", ", &tmp)) { 3372 if (sort_dimension__add(tok, &sched->sort_list) < 0) { 3373 usage_with_options_msg(usage_msg, options, 3374 "Unknown --sort key: `%s'", tok); 3375 } 3376 } 3377 3378 free(str); 3379 3380 sort_dimension__add("pid", &sched->cmp_pid); 3381 } 3382 3383 static bool schedstat_events_exposed(void) 3384 { 3385 /* 3386 * Select "sched:sched_stat_wait" event to check 3387 * whether schedstat tracepoints are exposed. 3388 */ 3389 return IS_ERR(trace_event__tp_format("sched", "sched_stat_wait")) ? 3390 false : true; 3391 } 3392 3393 static int __cmd_record(int argc, const char **argv) 3394 { 3395 unsigned int rec_argc, i, j; 3396 char **rec_argv; 3397 const char **rec_argv_copy; 3398 const char * const record_args[] = { 3399 "record", 3400 "-a", 3401 "-R", 3402 "-m", "1024", 3403 "-c", "1", 3404 "-e", "sched:sched_switch", 3405 "-e", "sched:sched_stat_runtime", 3406 "-e", "sched:sched_process_fork", 3407 "-e", "sched:sched_wakeup_new", 3408 "-e", "sched:sched_migrate_task", 3409 }; 3410 3411 /* 3412 * The tracepoints trace_sched_stat_{wait, sleep, iowait} 3413 * are not exposed to user if CONFIG_SCHEDSTATS is not set, 3414 * to prevent "perf sched record" execution failure, determine 3415 * whether to record schedstat events according to actual situation. 3416 */ 3417 const char * const schedstat_args[] = { 3418 "-e", "sched:sched_stat_wait", 3419 "-e", "sched:sched_stat_sleep", 3420 "-e", "sched:sched_stat_iowait", 3421 }; 3422 unsigned int schedstat_argc = schedstat_events_exposed() ? 3423 ARRAY_SIZE(schedstat_args) : 0; 3424 3425 struct tep_event *waking_event; 3426 int ret; 3427 3428 /* 3429 * +2 for either "-e", "sched:sched_wakeup" or 3430 * "-e", "sched:sched_waking" 3431 */ 3432 rec_argc = ARRAY_SIZE(record_args) + 2 + schedstat_argc + argc - 1; 3433 rec_argv = calloc(rec_argc + 1, sizeof(char *)); 3434 if (rec_argv == NULL) 3435 return -ENOMEM; 3436 rec_argv_copy = calloc(rec_argc + 1, sizeof(char *)); 3437 if (rec_argv_copy == NULL) { 3438 free(rec_argv); 3439 return -ENOMEM; 3440 } 3441 3442 for (i = 0; i < ARRAY_SIZE(record_args); i++) 3443 rec_argv[i] = strdup(record_args[i]); 3444 3445 rec_argv[i++] = strdup("-e"); 3446 waking_event = trace_event__tp_format("sched", "sched_waking"); 3447 if (!IS_ERR(waking_event)) 3448 rec_argv[i++] = strdup("sched:sched_waking"); 3449 else 3450 rec_argv[i++] = strdup("sched:sched_wakeup"); 3451 3452 for (j = 0; j < schedstat_argc; j++) 3453 rec_argv[i++] = strdup(schedstat_args[j]); 3454 3455 for (j = 1; j < (unsigned int)argc; j++, i++) 3456 rec_argv[i] = strdup(argv[j]); 3457 3458 BUG_ON(i != rec_argc); 3459 3460 memcpy(rec_argv_copy, rec_argv, sizeof(char *) * rec_argc); 3461 ret = cmd_record(rec_argc, rec_argv_copy); 3462 3463 for (i = 0; i < rec_argc; i++) 3464 free(rec_argv[i]); 3465 free(rec_argv); 3466 free(rec_argv_copy); 3467 3468 return ret; 3469 } 3470 3471 int cmd_sched(int argc, const char **argv) 3472 { 3473 static const char default_sort_order[] = "avg, max, switch, runtime"; 3474 struct perf_sched sched = { 3475 .tool = { 3476 .sample = perf_sched__process_tracepoint_sample, 3477 .comm = perf_sched__process_comm, 3478 .namespaces = perf_event__process_namespaces, 3479 .lost = perf_event__process_lost, 3480 .fork = perf_sched__process_fork_event, 3481 .ordered_events = true, 3482 }, 3483 .cmp_pid = LIST_HEAD_INIT(sched.cmp_pid), 3484 .sort_list = LIST_HEAD_INIT(sched.sort_list), 3485 .sort_order = default_sort_order, 3486 .replay_repeat = 10, 3487 .profile_cpu = -1, 3488 .next_shortname1 = 'A', 3489 .next_shortname2 = '0', 3490 .skip_merge = 0, 3491 .show_callchain = 1, 3492 .max_stack = 5, 3493 }; 3494 const struct option sched_options[] = { 3495 OPT_STRING('i', "input", &input_name, "file", 3496 "input file name"), 3497 OPT_INCR('v', "verbose", &verbose, 3498 "be more verbose (show symbol address, etc)"), 3499 OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace, 3500 "dump raw trace in ASCII"), 3501 OPT_BOOLEAN('f', "force", &sched.force, "don't complain, do it"), 3502 OPT_END() 3503 }; 3504 const struct option latency_options[] = { 3505 OPT_STRING('s', "sort", &sched.sort_order, "key[,key2...]", 3506 "sort by key(s): runtime, switch, avg, max"), 3507 OPT_INTEGER('C', "CPU", &sched.profile_cpu, 3508 "CPU to profile on"), 3509 OPT_BOOLEAN('p', "pids", &sched.skip_merge, 3510 "latency stats per pid instead of per comm"), 3511 OPT_PARENT(sched_options) 3512 }; 3513 const struct option replay_options[] = { 3514 OPT_UINTEGER('r', "repeat", &sched.replay_repeat, 3515 "repeat the workload replay N times (-1: infinite)"), 3516 OPT_PARENT(sched_options) 3517 }; 3518 const struct option map_options[] = { 3519 OPT_BOOLEAN(0, "compact", &sched.map.comp, 3520 "map output in compact mode"), 3521 OPT_STRING(0, "color-pids", &sched.map.color_pids_str, "pids", 3522 "highlight given pids in map"), 3523 OPT_STRING(0, "color-cpus", &sched.map.color_cpus_str, "cpus", 3524 "highlight given CPUs in map"), 3525 OPT_STRING(0, "cpus", &sched.map.cpus_str, "cpus", 3526 "display given CPUs in map"), 3527 OPT_PARENT(sched_options) 3528 }; 3529 const struct option timehist_options[] = { 3530 OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name, 3531 "file", "vmlinux pathname"), 3532 OPT_STRING(0, "kallsyms", &symbol_conf.kallsyms_name, 3533 "file", "kallsyms pathname"), 3534 OPT_BOOLEAN('g', "call-graph", &sched.show_callchain, 3535 "Display call chains if present (default on)"), 3536 OPT_UINTEGER(0, "max-stack", &sched.max_stack, 3537 "Maximum number of functions to display backtrace."), 3538 OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory", 3539 "Look for files with symbols relative to this directory"), 3540 OPT_BOOLEAN('s', "summary", &sched.summary_only, 3541 "Show only syscall summary with statistics"), 3542 OPT_BOOLEAN('S', "with-summary", &sched.summary, 3543 "Show all syscalls and summary with statistics"), 3544 OPT_BOOLEAN('w', "wakeups", &sched.show_wakeups, "Show wakeup events"), 3545 OPT_BOOLEAN('n', "next", &sched.show_next, "Show next task"), 3546 OPT_BOOLEAN('M', "migrations", &sched.show_migrations, "Show migration events"), 3547 OPT_BOOLEAN('V', "cpu-visual", &sched.show_cpu_visual, "Add CPU visual"), 3548 OPT_BOOLEAN('I', "idle-hist", &sched.idle_hist, "Show idle events only"), 3549 OPT_STRING(0, "time", &sched.time_str, "str", 3550 "Time span for analysis (start,stop)"), 3551 OPT_BOOLEAN(0, "state", &sched.show_state, "Show task state when sched-out"), 3552 OPT_STRING('p', "pid", &symbol_conf.pid_list_str, "pid[,pid...]", 3553 "analyze events only for given process id(s)"), 3554 OPT_STRING('t', "tid", &symbol_conf.tid_list_str, "tid[,tid...]", 3555 "analyze events only for given thread id(s)"), 3556 OPT_STRING('C', "cpu", &cpu_list, "cpu", "list of cpus to profile"), 3557 OPT_PARENT(sched_options) 3558 }; 3559 3560 const char * const latency_usage[] = { 3561 "perf sched latency [<options>]", 3562 NULL 3563 }; 3564 const char * const replay_usage[] = { 3565 "perf sched replay [<options>]", 3566 NULL 3567 }; 3568 const char * const map_usage[] = { 3569 "perf sched map [<options>]", 3570 NULL 3571 }; 3572 const char * const timehist_usage[] = { 3573 "perf sched timehist [<options>]", 3574 NULL 3575 }; 3576 const char *const sched_subcommands[] = { "record", "latency", "map", 3577 "replay", "script", 3578 "timehist", NULL }; 3579 const char *sched_usage[] = { 3580 NULL, 3581 NULL 3582 }; 3583 struct trace_sched_handler lat_ops = { 3584 .wakeup_event = latency_wakeup_event, 3585 .switch_event = latency_switch_event, 3586 .runtime_event = latency_runtime_event, 3587 .migrate_task_event = latency_migrate_task_event, 3588 }; 3589 struct trace_sched_handler map_ops = { 3590 .switch_event = map_switch_event, 3591 }; 3592 struct trace_sched_handler replay_ops = { 3593 .wakeup_event = replay_wakeup_event, 3594 .switch_event = replay_switch_event, 3595 .fork_event = replay_fork_event, 3596 }; 3597 unsigned int i; 3598 int ret = 0; 3599 3600 mutex_init(&sched.start_work_mutex); 3601 mutex_init(&sched.work_done_wait_mutex); 3602 for (i = 0; i < ARRAY_SIZE(sched.curr_pid); i++) 3603 sched.curr_pid[i] = -1; 3604 3605 argc = parse_options_subcommand(argc, argv, sched_options, sched_subcommands, 3606 sched_usage, PARSE_OPT_STOP_AT_NON_OPTION); 3607 if (!argc) 3608 usage_with_options(sched_usage, sched_options); 3609 3610 /* 3611 * Aliased to 'perf script' for now: 3612 */ 3613 if (!strcmp(argv[0], "script")) { 3614 ret = cmd_script(argc, argv); 3615 } else if (strlen(argv[0]) > 2 && strstarts("record", argv[0])) { 3616 ret = __cmd_record(argc, argv); 3617 } else if (strlen(argv[0]) > 2 && strstarts("latency", argv[0])) { 3618 sched.tp_handler = &lat_ops; 3619 if (argc > 1) { 3620 argc = parse_options(argc, argv, latency_options, latency_usage, 0); 3621 if (argc) 3622 usage_with_options(latency_usage, latency_options); 3623 } 3624 setup_sorting(&sched, latency_options, latency_usage); 3625 ret = perf_sched__lat(&sched); 3626 } else if (!strcmp(argv[0], "map")) { 3627 if (argc) { 3628 argc = parse_options(argc, argv, map_options, map_usage, 0); 3629 if (argc) 3630 usage_with_options(map_usage, map_options); 3631 } 3632 sched.tp_handler = &map_ops; 3633 setup_sorting(&sched, latency_options, latency_usage); 3634 ret = perf_sched__map(&sched); 3635 } else if (strlen(argv[0]) > 2 && strstarts("replay", argv[0])) { 3636 sched.tp_handler = &replay_ops; 3637 if (argc) { 3638 argc = parse_options(argc, argv, replay_options, replay_usage, 0); 3639 if (argc) 3640 usage_with_options(replay_usage, replay_options); 3641 } 3642 ret = perf_sched__replay(&sched); 3643 } else if (!strcmp(argv[0], "timehist")) { 3644 if (argc) { 3645 argc = parse_options(argc, argv, timehist_options, 3646 timehist_usage, 0); 3647 if (argc) 3648 usage_with_options(timehist_usage, timehist_options); 3649 } 3650 if ((sched.show_wakeups || sched.show_next) && 3651 sched.summary_only) { 3652 pr_err(" Error: -s and -[n|w] are mutually exclusive.\n"); 3653 parse_options_usage(timehist_usage, timehist_options, "s", true); 3654 if (sched.show_wakeups) 3655 parse_options_usage(NULL, timehist_options, "w", true); 3656 if (sched.show_next) 3657 parse_options_usage(NULL, timehist_options, "n", true); 3658 ret = -EINVAL; 3659 goto out; 3660 } 3661 ret = symbol__validate_sym_arguments(); 3662 if (ret) 3663 goto out; 3664 3665 ret = perf_sched__timehist(&sched); 3666 } else { 3667 usage_with_options(sched_usage, sched_options); 3668 } 3669 3670 out: 3671 mutex_destroy(&sched.start_work_mutex); 3672 mutex_destroy(&sched.work_done_wait_mutex); 3673 3674 return ret; 3675 } 3676