tools/perf/builtin-sched.c

   1 #include "builtin.h"
   2 #include "perf.h"
   3
   4 #include "util/util.h"
   5 #include "util/evlist.h"
   6 #include "util/cache.h"
   7 #include "util/evsel.h"
   8 #include "util/symbol.h"
   9 #include "util/thread.h"
  10 #include "util/header.h"
  11 #include "util/session.h"
  12 #include "util/tool.h"
  13
  14 #include "util/parse-options.h"
  15 #include "util/trace-event.h"
  16
  17 #include "util/debug.h"
  18
  19 #include <sys/prctl.h>
  20
  21 #include <semaphore.h>
  22 #include <pthread.h>
  23 #include <math.h>
  24
  25 static const char               *input_name;
  26
  27 static char                     default_sort_order[] = "avg, max, switch, runtime";
  28 static const char               *sort_order = default_sort_order;
  29
  30 static int                      profile_cpu = -1;
  31
  32 #define PR_SET_NAME             15               /* Set process name */
  33 #define MAX_CPUS                4096
  34
  35 static u64                      run_measurement_overhead;
  36 static u64                      sleep_measurement_overhead;
  37
  38 #define COMM_LEN                20
  39 #define SYM_LEN                 129
  40
  41 #define MAX_PID                 65536
  42
  43 static unsigned long            nr_tasks;
  44
  45 struct sched_atom;
  46
  47 struct task_desc {
  48         unsigned long           nr;
  49         unsigned long           pid;
  50         char                    comm[COMM_LEN];
  51
  52         unsigned long           nr_events;
  53         unsigned long           curr_event;
  54         struct sched_atom       **atoms;
  55
  56         pthread_t               thread;
  57         sem_t                   sleep_sem;
  58
  59         sem_t                   ready_for_work;
  60         sem_t                   work_done_sem;
  61
  62         u64                     cpu_usage;
  63 };
  64
  65 enum sched_event_type {
  66         SCHED_EVENT_RUN,
  67         SCHED_EVENT_SLEEP,
  68         SCHED_EVENT_WAKEUP,
  69         SCHED_EVENT_MIGRATION,
  70 };
  71
  72 struct sched_atom {
  73         enum sched_event_type   type;
  74         int                     specific_wait;
  75         u64                     timestamp;
  76         u64                     duration;
  77         unsigned long           nr;
  78         sem_t                   *wait_sem;
  79         struct task_desc        *wakee;
  80 };
  81
  82 static struct task_desc         *pid_to_task[MAX_PID];
  83
  84 static struct task_desc         **tasks;
  85
  86 static pthread_mutex_t          start_work_mutex = PTHREAD_MUTEX_INITIALIZER;
  87 static u64                      start_time;
  88
  89 static pthread_mutex_t          work_done_wait_mutex = PTHREAD_MUTEX_INITIALIZER;
  90
  91 static unsigned long            nr_run_events;
  92 static unsigned long            nr_sleep_events;
  93 static unsigned long            nr_wakeup_events;
  94
  95 static unsigned long            nr_sleep_corrections;
  96 static unsigned long            nr_run_events_optimized;
  97
  98 static unsigned long            targetless_wakeups;
  99 static unsigned long            multitarget_wakeups;
 100
 101 static u64                      cpu_usage;
 102 static u64                      runavg_cpu_usage;
 103 static u64                      parent_cpu_usage;
 104 static u64                      runavg_parent_cpu_usage;
 105
 106 static unsigned long            nr_runs;
 107 static u64                      sum_runtime;
 108 static u64                      sum_fluct;
 109 static u64                      run_avg;
 110
 111 static unsigned int             replay_repeat = 10;
 112 static unsigned long            nr_timestamps;
 113 static unsigned long            nr_unordered_timestamps;
 114 static unsigned long            nr_state_machine_bugs;
 115 static unsigned long            nr_context_switch_bugs;
 116 static unsigned long            nr_events;
 117 static unsigned long            nr_lost_chunks;
 118 static unsigned long            nr_lost_events;
 119
 120 #define TASK_STATE_TO_CHAR_STR "RSDTtZX"
 121
 122 enum thread_state {
 123         THREAD_SLEEPING = 0,
 124         THREAD_WAIT_CPU,
 125         THREAD_SCHED_IN,
 126         THREAD_IGNORE
 127 };
 128
 129 struct work_atom {
 130         struct list_head        list;
 131         enum thread_state       state;
 132         u64                     sched_out_time;
 133         u64                     wake_up_time;
 134         u64                     sched_in_time;
 135         u64                     runtime;
 136 };
 137
 138 struct work_atoms {
 139         struct list_head        work_list;
 140         struct thread           *thread;
 141         struct rb_node          node;
 142         u64                     max_lat;
 143         u64                     max_lat_at;
 144         u64                     total_lat;
 145         u64                     nb_atoms;
 146         u64                     total_runtime;
 147 };
 148
 149 typedef int (*sort_fn_t)(struct work_atoms *, struct work_atoms *);
 150
 151 static struct rb_root           atom_root, sorted_atom_root;
 152
 153 static u64                      all_runtime;
 154 static u64                      all_count;
 155
 156
 157 static u64 get_nsecs(void)
 158 {
 159         struct timespec ts;
 160
 161         clock_gettime(CLOCK_MONOTONIC, &ts);
 162
 163         return ts.tv_sec * 1000000000ULL + ts.tv_nsec;
 164 }
 165
 166 static void burn_nsecs(u64 nsecs)
 167 {
 168         u64 T0 = get_nsecs(), T1;
 169
 170         do {
 171                 T1 = get_nsecs();
 172         } while (T1 + run_measurement_overhead < T0 + nsecs);
 173 }
 174
 175 static void sleep_nsecs(u64 nsecs)
 176 {
 177         struct timespec ts;
 178
 179         ts.tv_nsec = nsecs % 999999999;
 180         ts.tv_sec = nsecs / 999999999;
 181
 182         nanosleep(&ts, NULL);
 183 }
 184
 185 static void calibrate_run_measurement_overhead(void)
 186 {
 187         u64 T0, T1, delta, min_delta = 1000000000ULL;
 188         int i;
 189
 190         for (i = 0; i < 10; i++) {
 191                 T0 = get_nsecs();
 192                 burn_nsecs(0);
 193                 T1 = get_nsecs();
 194                 delta = T1-T0;
 195                 min_delta = min(min_delta, delta);
 196         }
 197         run_measurement_overhead = min_delta;
 198
 199         printf("run measurement overhead: %" PRIu64 " nsecs\n", min_delta);
 200 }
 201
 202 static void calibrate_sleep_measurement_overhead(void)
 203 {
 204         u64 T0, T1, delta, min_delta = 1000000000ULL;
 205         int i;
 206
 207         for (i = 0; i < 10; i++) {
 208                 T0 = get_nsecs();
 209                 sleep_nsecs(10000);
 210                 T1 = get_nsecs();
 211                 delta = T1-T0;
 212                 min_delta = min(min_delta, delta);
 213         }
 214         min_delta -= 10000;
 215         sleep_measurement_overhead = min_delta;
 216
 217         printf("sleep measurement overhead: %" PRIu64 " nsecs\n", min_delta);
 218 }
 219
 220 static struct sched_atom *
 221 get_new_event(struct task_desc *task, u64 timestamp)
 222 {
 223         struct sched_atom *event = zalloc(sizeof(*event));
 224         unsigned long idx = task->nr_events;
 225         size_t size;
 226
 227         event->timestamp = timestamp;
 228         event->nr = idx;
 229
 230         task->nr_events++;
 231         size = sizeof(struct sched_atom *) * task->nr_events;
 232         task->atoms = realloc(task->atoms, size);
 233         BUG_ON(!task->atoms);
 234
 235         task->atoms[idx] = event;
 236
 237         return event;
 238 }
 239
 240 static struct sched_atom *last_event(struct task_desc *task)
 241 {
 242         if (!task->nr_events)
 243                 return NULL;
 244
 245         return task->atoms[task->nr_events - 1];
 246 }
 247
 248 static void
 249 add_sched_event_run(struct task_desc *task, u64 timestamp, u64 duration)
 250 {
 251         struct sched_atom *event, *curr_event = last_event(task);
 252
 253         /*
 254          * optimize an existing RUN event by merging this one
 255          * to it:
 256          */
 257         if (curr_event && curr_event->type == SCHED_EVENT_RUN) {
 258                 nr_run_events_optimized++;
 259                 curr_event->duration += duration;
 260                 return;
 261         }
 262
 263         event = get_new_event(task, timestamp);
 264
 265         event->type = SCHED_EVENT_RUN;
 266         event->duration = duration;
 267
 268         nr_run_events++;
 269 }
 270
 271 static void
 272 add_sched_event_wakeup(struct task_desc *task, u64 timestamp,
 273                        struct task_desc *wakee)
 274 {
 275         struct sched_atom *event, *wakee_event;
 276
 277         event = get_new_event(task, timestamp);
 278         event->type = SCHED_EVENT_WAKEUP;
 279         event->wakee = wakee;
 280
 281         wakee_event = last_event(wakee);
 282         if (!wakee_event || wakee_event->type != SCHED_EVENT_SLEEP) {
 283                 targetless_wakeups++;
 284                 return;
 285         }
 286         if (wakee_event->wait_sem) {
 287                 multitarget_wakeups++;
 288                 return;
 289         }
 290
 291         wakee_event->wait_sem = zalloc(sizeof(*wakee_event->wait_sem));
 292         sem_init(wakee_event->wait_sem, 0, 0);
 293         wakee_event->specific_wait = 1;
 294         event->wait_sem = wakee_event->wait_sem;
 295
 296         nr_wakeup_events++;
 297 }
 298
 299 static void
 300 add_sched_event_sleep(struct task_desc *task, u64 timestamp,
 301                       u64 task_state __used)
 302 {
 303         struct sched_atom *event = get_new_event(task, timestamp);
 304
 305         event->type = SCHED_EVENT_SLEEP;
 306
 307         nr_sleep_events++;
 308 }
 309
 310 static struct task_desc *register_pid(unsigned long pid, const char *comm)
 311 {
 312         struct task_desc *task;
 313
 314         BUG_ON(pid >= MAX_PID);
 315
 316         task = pid_to_task[pid];
 317
 318         if (task)
 319                 return task;
 320
 321         task = zalloc(sizeof(*task));
 322         task->pid = pid;
 323         task->nr = nr_tasks;
 324         strcpy(task->comm, comm);
 325         /*
 326          * every task starts in sleeping state - this gets ignored
 327          * if there's no wakeup pointing to this sleep state:
 328          */
 329         add_sched_event_sleep(task, 0, 0);
 330
 331         pid_to_task[pid] = task;
 332         nr_tasks++;
 333         tasks = realloc(tasks, nr_tasks*sizeof(struct task_task *));
 334         BUG_ON(!tasks);
 335         tasks[task->nr] = task;
 336
 337         if (verbose)
 338                 printf("registered task #%ld, PID %ld (%s)\n", nr_tasks, pid, comm);
 339
 340         return task;
 341 }
 342
 343
 344 static void print_task_traces(void)
 345 {
 346         struct task_desc *task;
 347         unsigned long i;
 348
 349         for (i = 0; i < nr_tasks; i++) {
 350                 task = tasks[i];
 351                 printf("task %6ld (%20s:%10ld), nr_events: %ld\n",
 352                         task->nr, task->comm, task->pid, task->nr_events);
 353         }
 354 }
 355
 356 static void add_cross_task_wakeups(void)
 357 {
 358         struct task_desc *task1, *task2;
 359         unsigned long i, j;
 360
 361         for (i = 0; i < nr_tasks; i++) {
 362                 task1 = tasks[i];
 363                 j = i + 1;
 364                 if (j == nr_tasks)
 365                         j = 0;
 366                 task2 = tasks[j];
 367                 add_sched_event_wakeup(task1, 0, task2);
 368         }
 369 }
 370
 371 static void
 372 process_sched_event(struct task_desc *this_task __used, struct sched_atom *atom)
 373 {
 374         int ret = 0;
 375
 376         switch (atom->type) {
 377                 case SCHED_EVENT_RUN:
 378                         burn_nsecs(atom->duration);
 379                         break;
 380                 case SCHED_EVENT_SLEEP:
 381                         if (atom->wait_sem)
 382                                 ret = sem_wait(atom->wait_sem);
 383                         BUG_ON(ret);
 384                         break;
 385                 case SCHED_EVENT_WAKEUP:
 386                         if (atom->wait_sem)
 387                                 ret = sem_post(atom->wait_sem);
 388                         BUG_ON(ret);
 389                         break;
 390                 case SCHED_EVENT_MIGRATION:
 391                         break;
 392                 default:
 393                         BUG_ON(1);
 394         }
 395 }
 396
 397 static u64 get_cpu_usage_nsec_parent(void)
 398 {
 399         struct rusage ru;
 400         u64 sum;
 401         int err;
 402
 403         err = getrusage(RUSAGE_SELF, &ru);
 404         BUG_ON(err);
 405
 406         sum =  ru.ru_utime.tv_sec*1e9 + ru.ru_utime.tv_usec*1e3;
 407         sum += ru.ru_stime.tv_sec*1e9 + ru.ru_stime.tv_usec*1e3;
 408
 409         return sum;
 410 }
 411
 412 static int self_open_counters(void)
 413 {
 414         struct perf_event_attr attr;
 415         int fd;
 416
 417         memset(&attr, 0, sizeof(attr));
 418
 419         attr.type = PERF_TYPE_SOFTWARE;
 420         attr.config = PERF_COUNT_SW_TASK_CLOCK;
 421
 422         fd = sys_perf_event_open(&attr, 0, -1, -1, 0);
 423
 424         if (fd < 0)
 425                 die("Error: sys_perf_event_open() syscall returned"
 426                     "with %d (%s)\n", fd, strerror(errno));
 427         return fd;
 428 }
 429
 430 static u64 get_cpu_usage_nsec_self(int fd)
 431 {
 432         u64 runtime;
 433         int ret;
 434
 435         ret = read(fd, &runtime, sizeof(runtime));
 436         BUG_ON(ret != sizeof(runtime));
 437
 438         return runtime;
 439 }
 440
 441 static void *thread_func(void *ctx)
 442 {
 443         struct task_desc *this_task = ctx;
 444         u64 cpu_usage_0, cpu_usage_1;
 445         unsigned long i, ret;
 446         char comm2[22];
 447         int fd;
 448
 449         sprintf(comm2, ":%s", this_task->comm);
 450         prctl(PR_SET_NAME, comm2);
 451         fd = self_open_counters();
 452
 453 again:
 454         ret = sem_post(&this_task->ready_for_work);
 455         BUG_ON(ret);
 456         ret = pthread_mutex_lock(&start_work_mutex);
 457         BUG_ON(ret);
 458         ret = pthread_mutex_unlock(&start_work_mutex);
 459         BUG_ON(ret);
 460
 461         cpu_usage_0 = get_cpu_usage_nsec_self(fd);
 462
 463         for (i = 0; i < this_task->nr_events; i++) {
 464                 this_task->curr_event = i;
 465                 process_sched_event(this_task, this_task->atoms[i]);
 466         }
 467
 468         cpu_usage_1 = get_cpu_usage_nsec_self(fd);
 469         this_task->cpu_usage = cpu_usage_1 - cpu_usage_0;
 470         ret = sem_post(&this_task->work_done_sem);
 471         BUG_ON(ret);
 472
 473         ret = pthread_mutex_lock(&work_done_wait_mutex);
 474         BUG_ON(ret);
 475         ret = pthread_mutex_unlock(&work_done_wait_mutex);
 476         BUG_ON(ret);
 477
 478         goto again;
 479 }
 480
 481 static void create_tasks(void)
 482 {
 483         struct task_desc *task;
 484         pthread_attr_t attr;
 485         unsigned long i;
 486         int err;
 487
 488         err = pthread_attr_init(&attr);
 489         BUG_ON(err);
 490         err = pthread_attr_setstacksize(&attr,
 491                         (size_t) max(16 * 1024, PTHREAD_STACK_MIN));
 492         BUG_ON(err);
 493         err = pthread_mutex_lock(&start_work_mutex);
 494         BUG_ON(err);
 495         err = pthread_mutex_lock(&work_done_wait_mutex);
 496         BUG_ON(err);
 497         for (i = 0; i < nr_tasks; i++) {
 498                 task = tasks[i];
 499                 sem_init(&task->sleep_sem, 0, 0);
 500                 sem_init(&task->ready_for_work, 0, 0);
 501                 sem_init(&task->work_done_sem, 0, 0);
 502                 task->curr_event = 0;
 503                 err = pthread_create(&task->thread, &attr, thread_func, task);
 504                 BUG_ON(err);
 505         }
 506 }
 507
 508 static void wait_for_tasks(void)
 509 {
 510         u64 cpu_usage_0, cpu_usage_1;
 511         struct task_desc *task;
 512         unsigned long i, ret;
 513
 514         start_time = get_nsecs();
 515         cpu_usage = 0;
 516         pthread_mutex_unlock(&work_done_wait_mutex);
 517
 518         for (i = 0; i < nr_tasks; i++) {
 519                 task = tasks[i];
 520                 ret = sem_wait(&task->ready_for_work);
 521                 BUG_ON(ret);
 522                 sem_init(&task->ready_for_work, 0, 0);
 523         }
 524         ret = pthread_mutex_lock(&work_done_wait_mutex);
 525         BUG_ON(ret);
 526
 527         cpu_usage_0 = get_cpu_usage_nsec_parent();
 528
 529         pthread_mutex_unlock(&start_work_mutex);
 530
 531         for (i = 0; i < nr_tasks; i++) {
 532                 task = tasks[i];
 533                 ret = sem_wait(&task->work_done_sem);
 534                 BUG_ON(ret);
 535                 sem_init(&task->work_done_sem, 0, 0);
 536                 cpu_usage += task->cpu_usage;
 537                 task->cpu_usage = 0;
 538         }
 539
 540         cpu_usage_1 = get_cpu_usage_nsec_parent();
 541         if (!runavg_cpu_usage)
 542                 runavg_cpu_usage = cpu_usage;
 543         runavg_cpu_usage = (runavg_cpu_usage*9 + cpu_usage)/10;
 544
 545         parent_cpu_usage = cpu_usage_1 - cpu_usage_0;
 546         if (!runavg_parent_cpu_usage)
 547                 runavg_parent_cpu_usage = parent_cpu_usage;
 548         runavg_parent_cpu_usage = (runavg_parent_cpu_usage*9 +
 549                                    parent_cpu_usage)/10;
 550
 551         ret = pthread_mutex_lock(&start_work_mutex);
 552         BUG_ON(ret);
 553
 554         for (i = 0; i < nr_tasks; i++) {
 555                 task = tasks[i];
 556                 sem_init(&task->sleep_sem, 0, 0);
 557                 task->curr_event = 0;
 558         }
 559 }
 560
 561 static void run_one_test(void)
 562 {
 563         u64 T0, T1, delta, avg_delta, fluct;
 564
 565         T0 = get_nsecs();
 566         wait_for_tasks();
 567         T1 = get_nsecs();
 568
 569         delta = T1 - T0;
 570         sum_runtime += delta;
 571         nr_runs++;
 572
 573         avg_delta = sum_runtime / nr_runs;
 574         if (delta < avg_delta)
 575                 fluct = avg_delta - delta;
 576         else
 577                 fluct = delta - avg_delta;
 578         sum_fluct += fluct;
 579         if (!run_avg)
 580                 run_avg = delta;
 581         run_avg = (run_avg*9 + delta)/10;
 582
 583         printf("#%-3ld: %0.3f, ",
 584                 nr_runs, (double)delta/1000000.0);
 585
 586         printf("ravg: %0.2f, ",
 587                 (double)run_avg/1e6);
 588
 589         printf("cpu: %0.2f / %0.2f",
 590                 (double)cpu_usage/1e6, (double)runavg_cpu_usage/1e6);
 591
 592 #if 0
 593         /*
 594          * rusage statistics done by the parent, these are less
 595          * accurate than the sum_exec_runtime based statistics:
 596          */
 597         printf(" [%0.2f / %0.2f]",
 598                 (double)parent_cpu_usage/1e6,
 599                 (double)runavg_parent_cpu_usage/1e6);
 600 #endif
 601
 602         printf("\n");
 603
 604         if (nr_sleep_corrections)
 605                 printf(" (%ld sleep corrections)\n", nr_sleep_corrections);
 606         nr_sleep_corrections = 0;
 607 }
 608
 609 static void test_calibrations(void)
 610 {
 611         u64 T0, T1;
 612
 613         T0 = get_nsecs();
 614         burn_nsecs(1e6);
 615         T1 = get_nsecs();
 616
 617         printf("the run test took %" PRIu64 " nsecs\n", T1 - T0);
 618
 619         T0 = get_nsecs();
 620         sleep_nsecs(1e6);
 621         T1 = get_nsecs();
 622
 623         printf("the sleep test took %" PRIu64 " nsecs\n", T1 - T0);
 624 }
 625
 626 #define FILL_FIELD(ptr, field, event, data)     \
 627         ptr.field = (typeof(ptr.field)) raw_field_value(event, #field, data)
 628
 629 #define FILL_ARRAY(ptr, array, event, data)                     \
 630 do {                                                            \
 631         void *__array = raw_field_ptr(event, #array, data);     \
 632         memcpy(ptr.array, __array, sizeof(ptr.array));  \
 633 } while(0)
 634
 635 #define FILL_COMMON_FIELDS(ptr, event, data)                    \
 636 do {                                                            \
 637         FILL_FIELD(ptr, common_type, event, data);              \
 638         FILL_FIELD(ptr, common_flags, event, data);             \
 639         FILL_FIELD(ptr, common_preempt_count, event, data);     \
 640         FILL_FIELD(ptr, common_pid, event, data);               \
 641         FILL_FIELD(ptr, common_tgid, event, data);              \
 642 } while (0)
 643
 644
 645
 646 struct trace_switch_event {
 647         u32 size;
 648
 649         u16 common_type;
 650         u8 common_flags;
 651         u8 common_preempt_count;
 652         u32 common_pid;
 653         u32 common_tgid;
 654
 655         char prev_comm[16];
 656         u32 prev_pid;
 657         u32 prev_prio;
 658         u64 prev_state;
 659         char next_comm[16];
 660         u32 next_pid;
 661         u32 next_prio;
 662 };
 663
 664 struct trace_runtime_event {
 665         u32 size;
 666
 667         u16 common_type;
 668         u8 common_flags;
 669         u8 common_preempt_count;
 670         u32 common_pid;
 671         u32 common_tgid;
 672
 673         char comm[16];
 674         u32 pid;
 675         u64 runtime;
 676         u64 vruntime;
 677 };
 678
 679 struct trace_wakeup_event {
 680         u32 size;
 681
 682         u16 common_type;
 683         u8 common_flags;
 684         u8 common_preempt_count;
 685         u32 common_pid;
 686         u32 common_tgid;
 687
 688         char comm[16];
 689         u32 pid;
 690
 691         u32 prio;
 692         u32 success;
 693         u32 cpu;
 694 };
 695
 696 struct trace_fork_event {
 697         u32 size;
 698
 699         u16 common_type;
 700         u8 common_flags;
 701         u8 common_preempt_count;
 702         u32 common_pid;
 703         u32 common_tgid;
 704
 705         char parent_comm[16];
 706         u32 parent_pid;
 707         char child_comm[16];
 708         u32 child_pid;
 709 };
 710
 711 struct trace_migrate_task_event {
 712         u32 size;
 713
 714         u16 common_type;
 715         u8 common_flags;
 716         u8 common_preempt_count;
 717         u32 common_pid;
 718         u32 common_tgid;
 719
 720         char comm[16];
 721         u32 pid;
 722
 723         u32 prio;
 724         u32 cpu;
 725 };
 726
 727 struct trace_sched_handler {
 728         void (*switch_event)(struct trace_switch_event *,
 729                              struct machine *,
 730                              struct event *,
 731                              int cpu,
 732                              u64 timestamp,
 733                              struct thread *thread);
 734
 735         void (*runtime_event)(struct trace_runtime_event *,
 736                               struct machine *,
 737                               struct event *,
 738                               int cpu,
 739                               u64 timestamp,
 740                               struct thread *thread);
 741
 742         void (*wakeup_event)(struct trace_wakeup_event *,
 743                              struct machine *,
 744                              struct event *,
 745                              int cpu,
 746                              u64 timestamp,
 747                              struct thread *thread);
 748
 749         void (*fork_event)(struct trace_fork_event *,
 750                            struct event *,
 751                            int cpu,
 752                            u64 timestamp,
 753                            struct thread *thread);
 754
 755         void (*migrate_task_event)(struct trace_migrate_task_event *,
 756                            struct machine *machine,
 757                            struct event *,
 758                            int cpu,
 759                            u64 timestamp,
 760                            struct thread *thread);
 761 };
 762
 763
 764 static void
 765 replay_wakeup_event(struct trace_wakeup_event *wakeup_event,
 766                     struct machine *machine __used,
 767                     struct event *event,
 768                     int cpu __used,
 769                     u64 timestamp __used,
 770                     struct thread *thread __used)
 771 {
 772         struct task_desc *waker, *wakee;
 773
 774         if (verbose) {
 775                 printf("sched_wakeup event %p\n", event);
 776
 777                 printf(" ... pid %d woke up %s/%d\n",
 778                         wakeup_event->common_pid,
 779                         wakeup_event->comm,
 780                         wakeup_event->pid);
 781         }
 782
 783         waker = register_pid(wakeup_event->common_pid, "<unknown>");
 784         wakee = register_pid(wakeup_event->pid, wakeup_event->comm);
 785
 786         add_sched_event_wakeup(waker, timestamp, wakee);
 787 }
 788
 789 static u64 cpu_last_switched[MAX_CPUS];
 790
 791 static void
 792 replay_switch_event(struct trace_switch_event *switch_event,
 793                     struct machine *machine __used,
 794                     struct event *event,
 795                     int cpu,
 796                     u64 timestamp,
 797                     struct thread *thread __used)
 798 {
 799         struct task_desc *prev, __used *next;
 800         u64 timestamp0;
 801         s64 delta;
 802
 803         if (verbose)
 804                 printf("sched_switch event %p\n", event);
 805
 806         if (cpu >= MAX_CPUS || cpu < 0)
 807                 return;
 808
 809         timestamp0 = cpu_last_switched[cpu];
 810         if (timestamp0)
 811                 delta = timestamp - timestamp0;
 812         else
 813                 delta = 0;
 814
 815         if (delta < 0)
 816                 die("hm, delta: %" PRIu64 " < 0 ?\n", delta);
 817
 818         if (verbose) {
 819                 printf(" ... switch from %s/%d to %s/%d [ran %" PRIu64 " nsecs]\n",
 820                         switch_event->prev_comm, switch_event->prev_pid,
 821                         switch_event->next_comm, switch_event->next_pid,
 822                         delta);
 823         }
 824
 825         prev = register_pid(switch_event->prev_pid, switch_event->prev_comm);
 826         next = register_pid(switch_event->next_pid, switch_event->next_comm);
 827
 828         cpu_last_switched[cpu] = timestamp;
 829
 830         add_sched_event_run(prev, timestamp, delta);
 831         add_sched_event_sleep(prev, timestamp, switch_event->prev_state);
 832 }
 833
 834
 835 static void
 836 replay_fork_event(struct trace_fork_event *fork_event,
 837                   struct event *event,
 838                   int cpu __used,
 839                   u64 timestamp __used,
 840                   struct thread *thread __used)
 841 {
 842         if (verbose) {
 843                 printf("sched_fork event %p\n", event);
 844                 printf("... parent: %s/%d\n", fork_event->parent_comm, fork_event->parent_pid);
 845                 printf("...  child: %s/%d\n", fork_event->child_comm, fork_event->child_pid);
 846         }
 847         register_pid(fork_event->parent_pid, fork_event->parent_comm);
 848         register_pid(fork_event->child_pid, fork_event->child_comm);
 849 }
 850
 851 static struct trace_sched_handler replay_ops  = {
 852         .wakeup_event           = replay_wakeup_event,
 853         .switch_event           = replay_switch_event,
 854         .fork_event             = replay_fork_event,
 855 };
 856
 857 struct sort_dimension {
 858         const char              *name;
 859         sort_fn_t               cmp;
 860         struct list_head        list;
 861 };
 862
 863 static LIST_HEAD(cmp_pid);
 864
 865 static int
 866 thread_lat_cmp(struct list_head *list, struct work_atoms *l, struct work_atoms *r)
 867 {
 868         struct sort_dimension *sort;
 869         int ret = 0;
 870
 871         BUG_ON(list_empty(list));
 872
 873         list_for_each_entry(sort, list, list) {
 874                 ret = sort->cmp(l, r);
 875                 if (ret)
 876                         return ret;
 877         }
 878
 879         return ret;
 880 }
 881
 882 static struct work_atoms *
 883 thread_atoms_search(struct rb_root *root, struct thread *thread,
 884                          struct list_head *sort_list)
 885 {
 886         struct rb_node *node = root->rb_node;
 887         struct work_atoms key = { .thread = thread };
 888
 889         while (node) {
 890                 struct work_atoms *atoms;
 891                 int cmp;
 892
 893                 atoms = container_of(node, struct work_atoms, node);
 894
 895                 cmp = thread_lat_cmp(sort_list, &key, atoms);
 896                 if (cmp > 0)
 897                         node = node->rb_left;
 898                 else if (cmp < 0)
 899                         node = node->rb_right;
 900                 else {
 901                         BUG_ON(thread != atoms->thread);
 902                         return atoms;
 903                 }
 904         }
 905         return NULL;
 906 }
 907
 908 static void
 909 __thread_latency_insert(struct rb_root *root, struct work_atoms *data,
 910                          struct list_head *sort_list)
 911 {
 912         struct rb_node **new = &(root->rb_node), *parent = NULL;
 913
 914         while (*new) {
 915                 struct work_atoms *this;
 916                 int cmp;
 917
 918                 this = container_of(*new, struct work_atoms, node);
 919                 parent = *new;
 920
 921                 cmp = thread_lat_cmp(sort_list, data, this);
 922
 923                 if (cmp > 0)
 924                         new = &((*new)->rb_left);
 925                 else
 926                         new = &((*new)->rb_right);
 927         }
 928
 929         rb_link_node(&data->node, parent, new);
 930         rb_insert_color(&data->node, root);
 931 }
 932
 933 static void thread_atoms_insert(struct thread *thread)
 934 {
 935         struct work_atoms *atoms = zalloc(sizeof(*atoms));
 936         if (!atoms)
 937                 die("No memory");
 938
 939         atoms->thread = thread;
 940         INIT_LIST_HEAD(&atoms->work_list);
 941         __thread_latency_insert(&atom_root, atoms, &cmp_pid);
 942 }
 943
 944 static void
 945 latency_fork_event(struct trace_fork_event *fork_event __used,
 946                    struct event *event __used,
 947                    int cpu __used,
 948                    u64 timestamp __used,
 949                    struct thread *thread __used)
 950 {
 951         /* should insert the newcomer */
 952 }
 953
 954 __used
 955 static char sched_out_state(struct trace_switch_event *switch_event)
 956 {
 957         const char *str = TASK_STATE_TO_CHAR_STR;
 958
 959         return str[switch_event->prev_state];
 960 }
 961
 962 static void
 963 add_sched_out_event(struct work_atoms *atoms,
 964                     char run_state,
 965                     u64 timestamp)
 966 {
 967         struct work_atom *atom = zalloc(sizeof(*atom));
 968         if (!atom)
 969                 die("Non memory");
 970
 971         atom->sched_out_time = timestamp;
 972
 973         if (run_state == 'R') {
 974                 atom->state = THREAD_WAIT_CPU;
 975                 atom->wake_up_time = atom->sched_out_time;
 976         }
 977
 978         list_add_tail(&atom->list, &atoms->work_list);
 979 }
 980
 981 static void
 982 add_runtime_event(struct work_atoms *atoms, u64 delta, u64 timestamp __used)
 983 {
 984         struct work_atom *atom;
 985
 986         BUG_ON(list_empty(&atoms->work_list));
 987
 988         atom = list_entry(atoms->work_list.prev, struct work_atom, list);
 989
 990         atom->runtime += delta;
 991         atoms->total_runtime += delta;
 992 }
 993
 994 static void
 995 add_sched_in_event(struct work_atoms *atoms, u64 timestamp)
 996 {
 997         struct work_atom *atom;
 998         u64 delta;
 999
1000         if (list_empty(&atoms->work_list))
1001                 return;
1002
1003         atom = list_entry(atoms->work_list.prev, struct work_atom, list);
1004
1005         if (atom->state != THREAD_WAIT_CPU)
1006                 return;
1007
1008         if (timestamp < atom->wake_up_time) {
1009                 atom->state = THREAD_IGNORE;
1010                 return;
1011         }
1012
1013         atom->state = THREAD_SCHED_IN;
1014         atom->sched_in_time = timestamp;
1015
1016         delta = atom->sched_in_time - atom->wake_up_time;
1017         atoms->total_lat += delta;
1018         if (delta > atoms->max_lat) {
1019                 atoms->max_lat = delta;
1020                 atoms->max_lat_at = timestamp;
1021         }
1022         atoms->nb_atoms++;
1023 }
1024
1025 static void
1026 latency_switch_event(struct trace_switch_event *switch_event,
1027                      struct machine *machine,
1028                      struct event *event __used,
1029                      int cpu,
1030                      u64 timestamp,
1031                      struct thread *thread __used)
1032 {
1033         struct work_atoms *out_events, *in_events;
1034         struct thread *sched_out, *sched_in;
1035         u64 timestamp0;
1036         s64 delta;
1037
1038         BUG_ON(cpu >= MAX_CPUS || cpu < 0);
1039
1040         timestamp0 = cpu_last_switched[cpu];
1041         cpu_last_switched[cpu] = timestamp;
1042         if (timestamp0)
1043                 delta = timestamp - timestamp0;
1044         else
1045                 delta = 0;
1046
1047         if (delta < 0)
1048                 die("hm, delta: %" PRIu64 " < 0 ?\n", delta);
1049
1050
1051         sched_out = machine__findnew_thread(machine, switch_event->prev_pid);
1052         sched_in = machine__findnew_thread(machine, switch_event->next_pid);
1053
1054         out_events = thread_atoms_search(&atom_root, sched_out, &cmp_pid);
1055         if (!out_events) {
1056                 thread_atoms_insert(sched_out);
1057                 out_events = thread_atoms_search(&atom_root, sched_out, &cmp_pid);
1058                 if (!out_events)
1059                         die("out-event: Internal tree error");
1060         }
1061         add_sched_out_event(out_events, sched_out_state(switch_event), timestamp);
1062
1063         in_events = thread_atoms_search(&atom_root, sched_in, &cmp_pid);
1064         if (!in_events) {
1065                 thread_atoms_insert(sched_in);
1066                 in_events = thread_atoms_search(&atom_root, sched_in, &cmp_pid);
1067                 if (!in_events)
1068                         die("in-event: Internal tree error");
1069                 /*
1070                  * Take came in we have not heard about yet,
1071                  * add in an initial atom in runnable state:
1072                  */
1073                 add_sched_out_event(in_events, 'R', timestamp);
1074         }
1075         add_sched_in_event(in_events, timestamp);
1076 }
1077
1078 static void
1079 latency_runtime_event(struct trace_runtime_event *runtime_event,
1080                      struct machine *machine,
1081                      struct event *event __used,
1082                      int cpu,
1083                      u64 timestamp,
1084                      struct thread *this_thread __used)
1085 {
1086         struct thread *thread = machine__findnew_thread(machine, runtime_event->pid);
1087         struct work_atoms *atoms = thread_atoms_search(&atom_root, thread, &cmp_pid);
1088
1089         BUG_ON(cpu >= MAX_CPUS || cpu < 0);
1090         if (!atoms) {
1091                 thread_atoms_insert(thread);
1092                 atoms = thread_atoms_search(&atom_root, thread, &cmp_pid);
1093                 if (!atoms)
1094                         die("in-event: Internal tree error");
1095                 add_sched_out_event(atoms, 'R', timestamp);
1096         }
1097
1098         add_runtime_event(atoms, runtime_event->runtime, timestamp);
1099 }
1100
1101 static void
1102 latency_wakeup_event(struct trace_wakeup_event *wakeup_event,
1103                      struct machine *machine,
1104                      struct event *__event __used,
1105                      int cpu __used,
1106                      u64 timestamp,
1107                      struct thread *thread __used)
1108 {
1109         struct work_atoms *atoms;
1110         struct work_atom *atom;
1111         struct thread *wakee;
1112
1113         /* Note for later, it may be interesting to observe the failing cases */
1114         if (!wakeup_event->success)
1115                 return;
1116
1117         wakee = machine__findnew_thread(machine, wakeup_event->pid);
1118         atoms = thread_atoms_search(&atom_root, wakee, &cmp_pid);
1119         if (!atoms) {
1120                 thread_atoms_insert(wakee);
1121                 atoms = thread_atoms_search(&atom_root, wakee, &cmp_pid);
1122                 if (!atoms)
1123                         die("wakeup-event: Internal tree error");
1124                 add_sched_out_event(atoms, 'S', timestamp);
1125         }
1126
1127         BUG_ON(list_empty(&atoms->work_list));
1128
1129         atom = list_entry(atoms->work_list.prev, struct work_atom, list);
1130
1131         /*
1132          * You WILL be missing events if you've recorded only
1133          * one CPU, or are only looking at only one, so don't
1134          * make useless noise.
1135          */
1136         if (profile_cpu == -1 && atom->state != THREAD_SLEEPING)
1137                 nr_state_machine_bugs++;
1138
1139         nr_timestamps++;
1140         if (atom->sched_out_time > timestamp) {
1141                 nr_unordered_timestamps++;
1142                 return;
1143         }
1144
1145         atom->state = THREAD_WAIT_CPU;
1146         atom->wake_up_time = timestamp;
1147 }
1148
1149 static void
1150 latency_migrate_task_event(struct trace_migrate_task_event *migrate_task_event,
1151                      struct machine *machine,
1152                      struct event *__event __used,
1153                      int cpu __used,
1154                      u64 timestamp,
1155                      struct thread *thread __used)
1156 {
1157         struct work_atoms *atoms;
1158         struct work_atom *atom;
1159         struct thread *migrant;
1160
1161         /*
1162          * Only need to worry about migration when profiling one CPU.
1163          */
1164         if (profile_cpu == -1)
1165                 return;
1166
1167         migrant = machine__findnew_thread(machine, migrate_task_event->pid);
1168         atoms = thread_atoms_search(&atom_root, migrant, &cmp_pid);
1169         if (!atoms) {
1170                 thread_atoms_insert(migrant);
1171                 register_pid(migrant->pid, migrant->comm);
1172                 atoms = thread_atoms_search(&atom_root, migrant, &cmp_pid);
1173                 if (!atoms)
1174                         die("migration-event: Internal tree error");
1175                 add_sched_out_event(atoms, 'R', timestamp);
1176         }
1177
1178         BUG_ON(list_empty(&atoms->work_list));
1179
1180         atom = list_entry(atoms->work_list.prev, struct work_atom, list);
1181         atom->sched_in_time = atom->sched_out_time = atom->wake_up_time = timestamp;
1182
1183         nr_timestamps++;
1184
1185         if (atom->sched_out_time > timestamp)
1186                 nr_unordered_timestamps++;
1187 }
1188
1189 static struct trace_sched_handler lat_ops  = {
1190         .wakeup_event           = latency_wakeup_event,
1191         .switch_event           = latency_switch_event,
1192         .runtime_event          = latency_runtime_event,
1193         .fork_event             = latency_fork_event,
1194         .migrate_task_event     = latency_migrate_task_event,
1195 };
1196
1197 static void output_lat_thread(struct work_atoms *work_list)
1198 {
1199         int i;
1200         int ret;
1201         u64 avg;
1202
1203         if (!work_list->nb_atoms)
1204                 return;
1205         /*
1206          * Ignore idle threads:
1207          */
1208         if (!strcmp(work_list->thread->comm, "swapper"))
1209                 return;
1210
1211         all_runtime += work_list->total_runtime;
1212         all_count += work_list->nb_atoms;
1213
1214         ret = printf("  %s:%d ", work_list->thread->comm, work_list->thread->pid);
1215
1216         for (i = 0; i < 24 - ret; i++)
1217                 printf(" ");
1218
1219         avg = work_list->total_lat / work_list->nb_atoms;
1220
1221         printf("|%11.3f ms |%9" PRIu64 " | avg:%9.3f ms | max:%9.3f ms | max at: %9.6f s\n",
1222               (double)work_list->total_runtime / 1e6,
1223                  work_list->nb_atoms, (double)avg / 1e6,
1224                  (double)work_list->max_lat / 1e6,
1225                  (double)work_list->max_lat_at / 1e9);
1226 }
1227
1228 static int pid_cmp(struct work_atoms *l, struct work_atoms *r)
1229 {
1230         if (l->thread->pid < r->thread->pid)
1231                 return -1;
1232         if (l->thread->pid > r->thread->pid)
1233                 return 1;
1234
1235         return 0;
1236 }
1237
1238 static struct sort_dimension pid_sort_dimension = {
1239         .name                   = "pid",
1240         .cmp                    = pid_cmp,
1241 };
1242
1243 static int avg_cmp(struct work_atoms *l, struct work_atoms *r)
1244 {
1245         u64 avgl, avgr;
1246
1247         if (!l->nb_atoms)
1248                 return -1;
1249
1250         if (!r->nb_atoms)
1251                 return 1;
1252
1253         avgl = l->total_lat / l->nb_atoms;
1254         avgr = r->total_lat / r->nb_atoms;
1255
1256         if (avgl < avgr)
1257                 return -1;
1258         if (avgl > avgr)
1259                 return 1;
1260
1261         return 0;
1262 }
1263
1264 static struct sort_dimension avg_sort_dimension = {
1265         .name                   = "avg",
1266         .cmp                    = avg_cmp,
1267 };
1268
1269 static int max_cmp(struct work_atoms *l, struct work_atoms *r)
1270 {
1271         if (l->max_lat < r->max_lat)
1272                 return -1;
1273         if (l->max_lat > r->max_lat)
1274                 return 1;
1275
1276         return 0;
1277 }
1278
1279 static struct sort_dimension max_sort_dimension = {
1280         .name                   = "max",
1281         .cmp                    = max_cmp,
1282 };
1283
1284 static int switch_cmp(struct work_atoms *l, struct work_atoms *r)
1285 {
1286         if (l->nb_atoms < r->nb_atoms)
1287                 return -1;
1288         if (l->nb_atoms > r->nb_atoms)
1289                 return 1;
1290
1291         return 0;
1292 }
1293
1294 static struct sort_dimension switch_sort_dimension = {
1295         .name                   = "switch",
1296         .cmp                    = switch_cmp,
1297 };
1298
1299 static int runtime_cmp(struct work_atoms *l, struct work_atoms *r)
1300 {
1301         if (l->total_runtime < r->total_runtime)
1302                 return -1;
1303         if (l->total_runtime > r->total_runtime)
1304                 return 1;
1305
1306         return 0;
1307 }
1308
1309 static struct sort_dimension runtime_sort_dimension = {
1310         .name                   = "runtime",
1311         .cmp                    = runtime_cmp,
1312 };
1313
1314 static struct sort_dimension *available_sorts[] = {
1315         &pid_sort_dimension,
1316         &avg_sort_dimension,
1317         &max_sort_dimension,
1318         &switch_sort_dimension,
1319         &runtime_sort_dimension,
1320 };
1321
1322 #define NB_AVAILABLE_SORTS      (int)(sizeof(available_sorts) / sizeof(struct sort_dimension *))
1323
1324 static LIST_HEAD(sort_list);
1325
1326 static int sort_dimension__add(const char *tok, struct list_head *list)
1327 {
1328         int i;
1329
1330         for (i = 0; i < NB_AVAILABLE_SORTS; i++) {
1331                 if (!strcmp(available_sorts[i]->name, tok)) {
1332                         list_add_tail(&available_sorts[i]->list, list);
1333
1334                         return 0;
1335                 }
1336         }
1337
1338         return -1;
1339 }
1340
1341 static void setup_sorting(void);
1342
1343 static void sort_lat(void)
1344 {
1345         struct rb_node *node;
1346
1347         for (;;) {
1348                 struct work_atoms *data;
1349                 node = rb_first(&atom_root);
1350                 if (!node)
1351                         break;
1352
1353                 rb_erase(node, &atom_root);
1354                 data = rb_entry(node, struct work_atoms, node);
1355                 __thread_latency_insert(&sorted_atom_root, data, &sort_list);
1356         }
1357 }
1358
1359 static struct trace_sched_handler *trace_handler;
1360
1361 static void
1362 process_sched_wakeup_event(struct perf_tool *tool __used,
1363                            struct event *event,
1364                            struct perf_sample *sample,
1365                            struct machine *machine,
1366                            struct thread *thread)
1367 {
1368         void *data = sample->raw_data;
1369         struct trace_wakeup_event wakeup_event;
1370
1371         FILL_COMMON_FIELDS(wakeup_event, event, data);
1372
1373         FILL_ARRAY(wakeup_event, comm, event, data);
1374         FILL_FIELD(wakeup_event, pid, event, data);
1375         FILL_FIELD(wakeup_event, prio, event, data);
1376         FILL_FIELD(wakeup_event, success, event, data);
1377         FILL_FIELD(wakeup_event, cpu, event, data);
1378
1379         if (trace_handler->wakeup_event)
1380                 trace_handler->wakeup_event(&wakeup_event, machine, event,
1381                                             sample->cpu, sample->time, thread);
1382 }
1383
1384 /*
1385  * Track the current task - that way we can know whether there's any
1386  * weird events, such as a task being switched away that is not current.
1387  */
1388 static int max_cpu;
1389
1390 static u32 curr_pid[MAX_CPUS] = { [0 ... MAX_CPUS-1] = -1 };
1391
1392 static struct thread *curr_thread[MAX_CPUS];
1393
1394 static char next_shortname1 = 'A';
1395 static char next_shortname2 = '0';
1396
1397 static void
1398 map_switch_event(struct trace_switch_event *switch_event,
1399                  struct machine *machine,
1400                  struct event *event __used,
1401                  int this_cpu,
1402                  u64 timestamp,
1403                  struct thread *thread __used)
1404 {
1405         struct thread *sched_out __used, *sched_in;
1406         int new_shortname;
1407         u64 timestamp0;
1408         s64 delta;
1409         int cpu;
1410
1411         BUG_ON(this_cpu >= MAX_CPUS || this_cpu < 0);
1412
1413         if (this_cpu > max_cpu)
1414                 max_cpu = this_cpu;
1415
1416         timestamp0 = cpu_last_switched[this_cpu];
1417         cpu_last_switched[this_cpu] = timestamp;
1418         if (timestamp0)
1419                 delta = timestamp - timestamp0;
1420         else
1421                 delta = 0;
1422
1423         if (delta < 0)
1424                 die("hm, delta: %" PRIu64 " < 0 ?\n", delta);
1425
1426
1427         sched_out = machine__findnew_thread(machine, switch_event->prev_pid);
1428         sched_in = machine__findnew_thread(machine, switch_event->next_pid);
1429
1430         curr_thread[this_cpu] = sched_in;
1431
1432         printf("  ");
1433
1434         new_shortname = 0;
1435         if (!sched_in->shortname[0]) {
1436                 sched_in->shortname[0] = next_shortname1;
1437                 sched_in->shortname[1] = next_shortname2;
1438
1439                 if (next_shortname1 < 'Z') {
1440                         next_shortname1++;
1441                 } else {
1442                         next_shortname1='A';
1443                         if (next_shortname2 < '9') {
1444                                 next_shortname2++;
1445                         } else {
1446                                 next_shortname2='0';
1447                         }
1448                 }
1449                 new_shortname = 1;
1450         }
1451
1452         for (cpu = 0; cpu <= max_cpu; cpu++) {
1453                 if (cpu != this_cpu)
1454                         printf(" ");
1455                 else
1456                         printf("*");
1457
1458                 if (curr_thread[cpu]) {
1459                         if (curr_thread[cpu]->pid)
1460                                 printf("%2s ", curr_thread[cpu]->shortname);
1461                         else
1462                                 printf(".  ");
1463                 } else
1464                         printf("   ");
1465         }
1466
1467         printf("  %12.6f secs ", (double)timestamp/1e9);
1468         if (new_shortname) {
1469                 printf("%s => %s:%d\n",
1470                         sched_in->shortname, sched_in->comm, sched_in->pid);
1471         } else {
1472                 printf("\n");
1473         }
1474 }
1475
1476 static void
1477 process_sched_switch_event(struct perf_tool *tool __used,
1478                            struct event *event,
1479                            struct perf_sample *sample,
1480                            struct machine *machine,
1481                            struct thread *thread)
1482 {
1483         int this_cpu = sample->cpu;
1484         void *data = sample->raw_data;
1485         struct trace_switch_event switch_event;
1486
1487         FILL_COMMON_FIELDS(switch_event, event, data);
1488
1489         FILL_ARRAY(switch_event, prev_comm, event, data);
1490         FILL_FIELD(switch_event, prev_pid, event, data);
1491         FILL_FIELD(switch_event, prev_prio, event, data);
1492         FILL_FIELD(switch_event, prev_state, event, data);
1493         FILL_ARRAY(switch_event, next_comm, event, data);
1494         FILL_FIELD(switch_event, next_pid, event, data);
1495         FILL_FIELD(switch_event, next_prio, event, data);
1496
1497         if (curr_pid[this_cpu] != (u32)-1) {
1498                 /*
1499                  * Are we trying to switch away a PID that is
1500                  * not current?
1501                  */
1502                 if (curr_pid[this_cpu] != switch_event.prev_pid)
1503                         nr_context_switch_bugs++;
1504         }
1505         if (trace_handler->switch_event)
1506                 trace_handler->switch_event(&switch_event, machine, event,
1507                                             this_cpu, sample->time, thread);
1508
1509         curr_pid[this_cpu] = switch_event.next_pid;
1510 }
1511
1512 static void
1513 process_sched_runtime_event(struct perf_tool *tool __used,
1514                             struct event *event,
1515                             struct perf_sample *sample,
1516                             struct machine *machine,
1517                             struct thread *thread)
1518 {
1519         void *data = sample->raw_data;
1520         struct trace_runtime_event runtime_event;
1521
1522         FILL_ARRAY(runtime_event, comm, event, data);
1523         FILL_FIELD(runtime_event, pid, event, data);
1524         FILL_FIELD(runtime_event, runtime, event, data);
1525         FILL_FIELD(runtime_event, vruntime, event, data);
1526
1527         if (trace_handler->runtime_event)
1528                 trace_handler->runtime_event(&runtime_event, machine, event,
1529                                              sample->cpu, sample->time, thread);
1530 }
1531
1532 static void
1533 process_sched_fork_event(struct perf_tool *tool __used,
1534                          struct event *event,
1535                          struct perf_sample *sample,
1536                          struct machine *machine __used,
1537                          struct thread *thread)
1538 {
1539         void *data = sample->raw_data;
1540         struct trace_fork_event fork_event;
1541
1542         FILL_COMMON_FIELDS(fork_event, event, data);
1543
1544         FILL_ARRAY(fork_event, parent_comm, event, data);
1545         FILL_FIELD(fork_event, parent_pid, event, data);
1546         FILL_ARRAY(fork_event, child_comm, event, data);
1547         FILL_FIELD(fork_event, child_pid, event, data);
1548
1549         if (trace_handler->fork_event)
1550                 trace_handler->fork_event(&fork_event, event,
1551                                           sample->cpu, sample->time, thread);
1552 }
1553
1554 static void
1555 process_sched_exit_event(struct perf_tool *tool __used,
1556                          struct event *event,
1557                          struct perf_sample *sample __used,
1558                          struct machine *machine __used,
1559                          struct thread *thread __used)
1560 {
1561         if (verbose)
1562                 printf("sched_exit event %p\n", event);
1563 }
1564
1565 static void
1566 process_sched_migrate_task_event(struct perf_tool *tool __used,
1567                                  struct event *event,
1568                                  struct perf_sample *sample,
1569                                  struct machine *machine,
1570                                  struct thread *thread)
1571 {
1572         void *data = sample->raw_data;
1573         struct trace_migrate_task_event migrate_task_event;
1574
1575         FILL_COMMON_FIELDS(migrate_task_event, event, data);
1576
1577         FILL_ARRAY(migrate_task_event, comm, event, data);
1578         FILL_FIELD(migrate_task_event, pid, event, data);
1579         FILL_FIELD(migrate_task_event, prio, event, data);
1580         FILL_FIELD(migrate_task_event, cpu, event, data);
1581
1582         if (trace_handler->migrate_task_event)
1583                 trace_handler->migrate_task_event(&migrate_task_event, machine,
1584                                                   event, sample->cpu,
1585                                                   sample->time, thread);
1586 }
1587
1588 typedef void (*tracepoint_handler)(struct perf_tool *tool, struct event *event,
1589                                    struct perf_sample *sample,
1590                                    struct machine *machine,
1591                                    struct thread *thread);
1592
1593 static int perf_sched__process_tracepoint_sample(struct perf_tool *tool,
1594                                                  union perf_event *event __used,
1595                                                  struct perf_sample *sample,
1596                                                  struct perf_evsel *evsel,
1597                                                  struct machine *machine)
1598 {
1599         struct thread *thread = machine__findnew_thread(machine, sample->pid);
1600
1601         if (thread == NULL) {
1602                 pr_debug("problem processing %s event, skipping it.\n",
1603                          evsel->name);
1604                 return -1;
1605         }
1606
1607         evsel->hists.stats.total_period += sample->period;
1608         hists__inc_nr_events(&evsel->hists, PERF_RECORD_SAMPLE);
1609
1610         if (evsel->handler.func != NULL) {
1611                 tracepoint_handler f = evsel->handler.func;
1612
1613                 if (evsel->handler.data == NULL)
1614                         evsel->handler.data = trace_find_event(evsel->attr.config);
1615
1616                 f(tool, evsel->handler.data, sample, machine, thread);
1617         }
1618
1619         return 0;
1620 }
1621
1622 static struct perf_tool perf_sched = {
1623         .sample                 = perf_sched__process_tracepoint_sample,
1624         .comm                   = perf_event__process_comm,
1625         .lost                   = perf_event__process_lost,
1626         .fork                   = perf_event__process_task,
1627         .ordered_samples        = true,
1628 };
1629
1630 static void read_events(bool destroy, struct perf_session **psession)
1631 {
1632         int err = -EINVAL;
1633         const struct perf_evsel_str_handler handlers[] = {
1634                 { "sched:sched_switch",       process_sched_switch_event, },
1635                 { "sched:sched_stat_runtime", process_sched_runtime_event, },
1636                 { "sched:sched_wakeup",       process_sched_wakeup_event, },
1637                 { "sched:sched_wakeup_new",   process_sched_wakeup_event, },
1638                 { "sched:sched_process_fork", process_sched_fork_event, },
1639                 { "sched:sched_process_exit", process_sched_exit_event, },
1640                 { "sched:sched_migrate_task", process_sched_migrate_task_event, },
1641         };
1642         struct perf_session *session = perf_session__new(input_name, O_RDONLY,
1643                                                          0, false, &perf_sched);
1644         if (session == NULL)
1645                 die("No Memory");
1646
1647         err = perf_evlist__set_tracepoints_handlers_array(session->evlist, handlers);
1648         assert(err == 0);
1649
1650         if (perf_session__has_traces(session, "record -R")) {
1651                 err = perf_session__process_events(session, &perf_sched);
1652                 if (err)
1653                         die("Failed to process events, error %d", err);
1654
1655                 nr_events      = session->hists.stats.nr_events[0];
1656                 nr_lost_events = session->hists.stats.total_lost;
1657                 nr_lost_chunks = session->hists.stats.nr_events[PERF_RECORD_LOST];
1658         }
1659
1660         if (destroy)
1661                 perf_session__delete(session);
1662
1663         if (psession)
1664                 *psession = session;
1665 }
1666
1667 static void print_bad_events(void)
1668 {
1669         if (nr_unordered_timestamps && nr_timestamps) {
1670                 printf("  INFO: %.3f%% unordered timestamps (%ld out of %ld)\n",
1671                         (double)nr_unordered_timestamps/(double)nr_timestamps*100.0,
1672                         nr_unordered_timestamps, nr_timestamps);
1673         }
1674         if (nr_lost_events && nr_events) {
1675                 printf("  INFO: %.3f%% lost events (%ld out of %ld, in %ld chunks)\n",
1676                         (double)nr_lost_events/(double)nr_events*100.0,
1677                         nr_lost_events, nr_events, nr_lost_chunks);
1678         }
1679         if (nr_state_machine_bugs && nr_timestamps) {
1680                 printf("  INFO: %.3f%% state machine bugs (%ld out of %ld)",
1681                         (double)nr_state_machine_bugs/(double)nr_timestamps*100.0,
1682                         nr_state_machine_bugs, nr_timestamps);
1683                 if (nr_lost_events)
1684                         printf(" (due to lost events?)");
1685                 printf("\n");
1686         }
1687         if (nr_context_switch_bugs && nr_timestamps) {
1688                 printf("  INFO: %.3f%% context switch bugs (%ld out of %ld)",
1689                         (double)nr_context_switch_bugs/(double)nr_timestamps*100.0,
1690                         nr_context_switch_bugs, nr_timestamps);
1691                 if (nr_lost_events)
1692                         printf(" (due to lost events?)");
1693                 printf("\n");
1694         }
1695 }
1696
1697 static void __cmd_lat(void)
1698 {
1699         struct rb_node *next;
1700         struct perf_session *session;
1701
1702         setup_pager();
1703         read_events(false, &session);
1704         sort_lat();
1705
1706         printf("\n ---------------------------------------------------------------------------------------------------------------\n");
1707         printf("  Task                  |   Runtime ms  | Switches | Average delay ms | Maximum delay ms | Maximum delay at     |\n");
1708         printf(" ---------------------------------------------------------------------------------------------------------------\n");
1709
1710         next = rb_first(&sorted_atom_root);
1711
1712         while (next) {
1713                 struct work_atoms *work_list;
1714
1715                 work_list = rb_entry(next, struct work_atoms, node);
1716                 output_lat_thread(work_list);
1717                 next = rb_next(next);
1718         }
1719
1720         printf(" -----------------------------------------------------------------------------------------\n");
1721         printf("  TOTAL:                |%11.3f ms |%9" PRIu64 " |\n",
1722                 (double)all_runtime/1e6, all_count);
1723
1724         printf(" ---------------------------------------------------\n");
1725
1726         print_bad_events();
1727         printf("\n");
1728
1729         perf_session__delete(session);
1730 }
1731
1732 static struct trace_sched_handler map_ops  = {
1733         .wakeup_event           = NULL,
1734         .switch_event           = map_switch_event,
1735         .runtime_event          = NULL,
1736         .fork_event             = NULL,
1737 };
1738
1739 static void __cmd_map(void)
1740 {
1741         max_cpu = sysconf(_SC_NPROCESSORS_CONF);
1742
1743         setup_pager();
1744         read_events(true, NULL);
1745         print_bad_events();
1746 }
1747
1748 static void __cmd_replay(void)
1749 {
1750         unsigned long i;
1751
1752         calibrate_run_measurement_overhead();
1753         calibrate_sleep_measurement_overhead();
1754
1755         test_calibrations();
1756
1757         read_events(true, NULL);
1758
1759         printf("nr_run_events:        %ld\n", nr_run_events);
1760         printf("nr_sleep_events:      %ld\n", nr_sleep_events);
1761         printf("nr_wakeup_events:     %ld\n", nr_wakeup_events);
1762
1763         if (targetless_wakeups)
1764                 printf("target-less wakeups:  %ld\n", targetless_wakeups);
1765         if (multitarget_wakeups)
1766                 printf("multi-target wakeups: %ld\n", multitarget_wakeups);
1767         if (nr_run_events_optimized)
1768                 printf("run atoms optimized: %ld\n",
1769                         nr_run_events_optimized);
1770
1771         print_task_traces();
1772         add_cross_task_wakeups();
1773
1774         create_tasks();
1775         printf("------------------------------------------------------------\n");
1776         for (i = 0; i < replay_repeat; i++)
1777                 run_one_test();
1778 }
1779
1780
1781 static const char * const sched_usage[] = {
1782         "perf sched [<options>] {record|latency|map|replay|script}",
1783         NULL
1784 };
1785
1786 static const struct option sched_options[] = {
1787         OPT_STRING('i', "input", &input_name, "file",
1788                     "input file name"),
1789         OPT_INCR('v', "verbose", &verbose,
1790                     "be more verbose (show symbol address, etc)"),
1791         OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
1792                     "dump raw trace in ASCII"),
1793         OPT_END()
1794 };
1795
1796 static const char * const latency_usage[] = {
1797         "perf sched latency [<options>]",
1798         NULL
1799 };
1800
1801 static const struct option latency_options[] = {
1802         OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
1803                    "sort by key(s): runtime, switch, avg, max"),
1804         OPT_INCR('v', "verbose", &verbose,
1805                     "be more verbose (show symbol address, etc)"),
1806         OPT_INTEGER('C', "CPU", &profile_cpu,
1807                     "CPU to profile on"),
1808         OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
1809                     "dump raw trace in ASCII"),
1810         OPT_END()
1811 };
1812
1813 static const char * const replay_usage[] = {
1814         "perf sched replay [<options>]",
1815         NULL
1816 };
1817
1818 static const struct option replay_options[] = {
1819         OPT_UINTEGER('r', "repeat", &replay_repeat,
1820                      "repeat the workload replay N times (-1: infinite)"),
1821         OPT_INCR('v', "verbose", &verbose,
1822                     "be more verbose (show symbol address, etc)"),
1823         OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
1824                     "dump raw trace in ASCII"),
1825         OPT_END()
1826 };
1827
1828 static void setup_sorting(void)
1829 {
1830         char *tmp, *tok, *str = strdup(sort_order);
1831
1832         for (tok = strtok_r(str, ", ", &tmp);
1833                         tok; tok = strtok_r(NULL, ", ", &tmp)) {
1834                 if (sort_dimension__add(tok, &sort_list) < 0) {
1835                         error("Unknown --sort key: `%s'", tok);
1836                         usage_with_options(latency_usage, latency_options);
1837                 }
1838         }
1839
1840         free(str);
1841
1842         sort_dimension__add("pid", &cmp_pid);
1843 }
1844
1845 static const char *record_args[] = {
1846         "record",
1847         "-a",
1848         "-R",
1849         "-f",
1850         "-m", "1024",
1851         "-c", "1",
1852         "-e", "sched:sched_switch",
1853         "-e", "sched:sched_stat_wait",
1854         "-e", "sched:sched_stat_sleep",
1855         "-e", "sched:sched_stat_iowait",
1856         "-e", "sched:sched_stat_runtime",
1857         "-e", "sched:sched_process_exit",
1858         "-e", "sched:sched_process_fork",
1859         "-e", "sched:sched_wakeup",
1860         "-e", "sched:sched_migrate_task",
1861 };
1862
1863 static int __cmd_record(int argc, const char **argv)
1864 {
1865         unsigned int rec_argc, i, j;
1866         const char **rec_argv;
1867
1868         rec_argc = ARRAY_SIZE(record_args) + argc - 1;
1869         rec_argv = calloc(rec_argc + 1, sizeof(char *));
1870
1871         if (rec_argv == NULL)
1872                 return -ENOMEM;
1873
1874         for (i = 0; i < ARRAY_SIZE(record_args); i++)
1875                 rec_argv[i] = strdup(record_args[i]);
1876
1877         for (j = 1; j < (unsigned int)argc; j++, i++)
1878                 rec_argv[i] = argv[j];
1879
1880         BUG_ON(i != rec_argc);
1881
1882         return cmd_record(i, rec_argv, NULL);
1883 }
1884
1885 int cmd_sched(int argc, const char **argv, const char *prefix __used)
1886 {
1887         argc = parse_options(argc, argv, sched_options, sched_usage,
1888                              PARSE_OPT_STOP_AT_NON_OPTION);
1889         if (!argc)
1890                 usage_with_options(sched_usage, sched_options);
1891
1892         /*
1893          * Aliased to 'perf script' for now:
1894          */
1895         if (!strcmp(argv[0], "script"))
1896                 return cmd_script(argc, argv, prefix);
1897
1898         symbol__init();
1899         if (!strncmp(argv[0], "rec", 3)) {
1900                 return __cmd_record(argc, argv);
1901         } else if (!strncmp(argv[0], "lat", 3)) {
1902                 trace_handler = &lat_ops;
1903                 if (argc > 1) {
1904                         argc = parse_options(argc, argv, latency_options, latency_usage, 0);
1905                         if (argc)
1906                                 usage_with_options(latency_usage, latency_options);
1907                 }
1908                 setup_sorting();
1909                 __cmd_lat();
1910         } else if (!strcmp(argv[0], "map")) {
1911                 trace_handler = &map_ops;
1912                 setup_sorting();
1913                 __cmd_map();
1914         } else if (!strncmp(argv[0], "rep", 3)) {
1915                 trace_handler = &replay_ops;
1916                 if (argc) {
1917                         argc = parse_options(argc, argv, replay_options, replay_usage, 0);
1918                         if (argc)
1919                                 usage_with_options(replay_usage, replay_options);
1920                 }
1921                 __cmd_replay();
1922         } else {
1923                 usage_with_options(sched_usage, sched_options);
1924         }
1925
1926         return 0;
1927 }