SAFE public projects git trees. - safe/jmp/linux-2.6/blob - tools/perf/builtin-sched.c

   1 #include "builtin.h"
   2 #include "perf.h"
   3
   4 #include "util/util.h"
   5 #include "util/cache.h"
   6 #include "util/symbol.h"
   7 #include "util/thread.h"
   8 #include "util/header.h"
   9 #include "util/session.h"
  10
  11 #include "util/parse-options.h"
  12 #include "util/trace-event.h"
  13
  14 #include "util/debug.h"
  15
  16 #include <sys/prctl.h>
  17
  18 #include <semaphore.h>
  19 #include <pthread.h>
  20 #include <math.h>
  21
  22 static char                     const *input_name = "perf.data";
  23
  24 static u64                      sample_type;
  25
  26 static char                     default_sort_order[] = "avg, max, switch, runtime";
  27 static char                     *sort_order = default_sort_order;
  28
  29 static int                      profile_cpu = -1;
  30
  31 #define PR_SET_NAME             15               /* Set process name */
  32 #define MAX_CPUS                4096
  33
  34 static u64                      run_measurement_overhead;
  35 static u64                      sleep_measurement_overhead;
  36
  37 #define COMM_LEN                20
  38 #define SYM_LEN                 129
  39
  40 #define MAX_PID                 65536
  41
  42 static unsigned long            nr_tasks;
  43
  44 struct sched_atom;
  45
  46 struct task_desc {
  47         unsigned long           nr;
  48         unsigned long           pid;
  49         char                    comm[COMM_LEN];
  50
  51         unsigned long           nr_events;
  52         unsigned long           curr_event;
  53         struct sched_atom       **atoms;
  54
  55         pthread_t               thread;
  56         sem_t                   sleep_sem;
  57
  58         sem_t                   ready_for_work;
  59         sem_t                   work_done_sem;
  60
  61         u64                     cpu_usage;
  62 };
  63
  64 enum sched_event_type {
  65         SCHED_EVENT_RUN,
  66         SCHED_EVENT_SLEEP,
  67         SCHED_EVENT_WAKEUP,
  68         SCHED_EVENT_MIGRATION,
  69 };
  70
  71 struct sched_atom {
  72         enum sched_event_type   type;
  73         u64                     timestamp;
  74         u64                     duration;
  75         unsigned long           nr;
  76         int                     specific_wait;
  77         sem_t                   *wait_sem;
  78         struct task_desc        *wakee;
  79 };
  80
  81 static struct task_desc         *pid_to_task[MAX_PID];
  82
  83 static struct task_desc         **tasks;
  84
  85 static pthread_mutex_t          start_work_mutex = PTHREAD_MUTEX_INITIALIZER;
  86 static u64                      start_time;
  87
  88 static pthread_mutex_t          work_done_wait_mutex = PTHREAD_MUTEX_INITIALIZER;
  89
  90 static unsigned long            nr_run_events;
  91 static unsigned long            nr_sleep_events;
  92 static unsigned long            nr_wakeup_events;
  93
  94 static unsigned long            nr_sleep_corrections;
  95 static unsigned long            nr_run_events_optimized;
  96
  97 static unsigned long            targetless_wakeups;
  98 static unsigned long            multitarget_wakeups;
  99
 100 static u64                      cpu_usage;
 101 static u64                      runavg_cpu_usage;
 102 static u64                      parent_cpu_usage;
 103 static u64                      runavg_parent_cpu_usage;
 104
 105 static unsigned long            nr_runs;
 106 static u64                      sum_runtime;
 107 static u64                      sum_fluct;
 108 static u64                      run_avg;
 109
 110 static unsigned long            replay_repeat = 10;
 111 static unsigned long            nr_timestamps;
 112 static unsigned long            nr_unordered_timestamps;
 113 static unsigned long            nr_state_machine_bugs;
 114 static unsigned long            nr_context_switch_bugs;
 115 static unsigned long            nr_events;
 116 static unsigned long            nr_lost_chunks;
 117 static unsigned long            nr_lost_events;
 118
 119 #define TASK_STATE_TO_CHAR_STR "RSDTtZX"
 120
 121 enum thread_state {
 122         THREAD_SLEEPING = 0,
 123         THREAD_WAIT_CPU,
 124         THREAD_SCHED_IN,
 125         THREAD_IGNORE
 126 };
 127
 128 struct work_atom {
 129         struct list_head        list;
 130         enum thread_state       state;
 131         u64                     sched_out_time;
 132         u64                     wake_up_time;
 133         u64                     sched_in_time;
 134         u64                     runtime;
 135 };
 136
 137 struct work_atoms {
 138         struct list_head        work_list;
 139         struct thread           *thread;
 140         struct rb_node          node;
 141         u64                     max_lat;
 142         u64                     max_lat_at;
 143         u64                     total_lat;
 144         u64                     nb_atoms;
 145         u64                     total_runtime;
 146 };
 147
 148 typedef int (*sort_fn_t)(struct work_atoms *, struct work_atoms *);
 149
 150 static struct rb_root           atom_root, sorted_atom_root;
 151
 152 static u64                      all_runtime;
 153 static u64                      all_count;
 154
 155
 156 static u64 get_nsecs(void)
 157 {
 158         struct timespec ts;
 159
 160         clock_gettime(CLOCK_MONOTONIC, &ts);
 161
 162         return ts.tv_sec * 1000000000ULL + ts.tv_nsec;
 163 }
 164
 165 static void burn_nsecs(u64 nsecs)
 166 {
 167         u64 T0 = get_nsecs(), T1;
 168
 169         do {
 170                 T1 = get_nsecs();
 171         } while (T1 + run_measurement_overhead < T0 + nsecs);
 172 }
 173
 174 static void sleep_nsecs(u64 nsecs)
 175 {
 176         struct timespec ts;
 177
 178         ts.tv_nsec = nsecs % 999999999;
 179         ts.tv_sec = nsecs / 999999999;
 180
 181         nanosleep(&ts, NULL);
 182 }
 183
 184 static void calibrate_run_measurement_overhead(void)
 185 {
 186         u64 T0, T1, delta, min_delta = 1000000000ULL;
 187         int i;
 188
 189         for (i = 0; i < 10; i++) {
 190                 T0 = get_nsecs();
 191                 burn_nsecs(0);
 192                 T1 = get_nsecs();
 193                 delta = T1-T0;
 194                 min_delta = min(min_delta, delta);
 195         }
 196         run_measurement_overhead = min_delta;
 197
 198         printf("run measurement overhead: %Ld nsecs\n", min_delta);
 199 }
 200
 201 static void calibrate_sleep_measurement_overhead(void)
 202 {
 203         u64 T0, T1, delta, min_delta = 1000000000ULL;
 204         int i;
 205
 206         for (i = 0; i < 10; i++) {
 207                 T0 = get_nsecs();
 208                 sleep_nsecs(10000);
 209                 T1 = get_nsecs();
 210                 delta = T1-T0;
 211                 min_delta = min(min_delta, delta);
 212         }
 213         min_delta -= 10000;
 214         sleep_measurement_overhead = min_delta;
 215
 216         printf("sleep measurement overhead: %Ld nsecs\n", min_delta);
 217 }
 218
 219 static struct sched_atom *
 220 get_new_event(struct task_desc *task, u64 timestamp)
 221 {
 222         struct sched_atom *event = zalloc(sizeof(*event));
 223         unsigned long idx = task->nr_events;
 224         size_t size;
 225
 226         event->timestamp = timestamp;
 227         event->nr = idx;
 228
 229         task->nr_events++;
 230         size = sizeof(struct sched_atom *) * task->nr_events;
 231         task->atoms = realloc(task->atoms, size);
 232         BUG_ON(!task->atoms);
 233
 234         task->atoms[idx] = event;
 235
 236         return event;
 237 }
 238
 239 static struct sched_atom *last_event(struct task_desc *task)
 240 {
 241         if (!task->nr_events)
 242                 return NULL;
 243
 244         return task->atoms[task->nr_events - 1];
 245 }
 246
 247 static void
 248 add_sched_event_run(struct task_desc *task, u64 timestamp, u64 duration)
 249 {
 250         struct sched_atom *event, *curr_event = last_event(task);
 251
 252         /*
 253          * optimize an existing RUN event by merging this one
 254          * to it:
 255          */
 256         if (curr_event && curr_event->type == SCHED_EVENT_RUN) {
 257                 nr_run_events_optimized++;
 258                 curr_event->duration += duration;
 259                 return;
 260         }
 261
 262         event = get_new_event(task, timestamp);
 263
 264         event->type = SCHED_EVENT_RUN;
 265         event->duration = duration;
 266
 267         nr_run_events++;
 268 }
 269
 270 static void
 271 add_sched_event_wakeup(struct task_desc *task, u64 timestamp,
 272                        struct task_desc *wakee)
 273 {
 274         struct sched_atom *event, *wakee_event;
 275
 276         event = get_new_event(task, timestamp);
 277         event->type = SCHED_EVENT_WAKEUP;
 278         event->wakee = wakee;
 279
 280         wakee_event = last_event(wakee);
 281         if (!wakee_event || wakee_event->type != SCHED_EVENT_SLEEP) {
 282                 targetless_wakeups++;
 283                 return;
 284         }
 285         if (wakee_event->wait_sem) {
 286                 multitarget_wakeups++;
 287                 return;
 288         }
 289
 290         wakee_event->wait_sem = zalloc(sizeof(*wakee_event->wait_sem));
 291         sem_init(wakee_event->wait_sem, 0, 0);
 292         wakee_event->specific_wait = 1;
 293         event->wait_sem = wakee_event->wait_sem;
 294
 295         nr_wakeup_events++;
 296 }
 297
 298 static void
 299 add_sched_event_sleep(struct task_desc *task, u64 timestamp,
 300                       u64 task_state __used)
 301 {
 302         struct sched_atom *event = get_new_event(task, timestamp);
 303
 304         event->type = SCHED_EVENT_SLEEP;
 305
 306         nr_sleep_events++;
 307 }
 308
 309 static struct task_desc *register_pid(unsigned long pid, const char *comm)
 310 {
 311         struct task_desc *task;
 312
 313         BUG_ON(pid >= MAX_PID);
 314
 315         task = pid_to_task[pid];
 316
 317         if (task)
 318                 return task;
 319
 320         task = zalloc(sizeof(*task));
 321         task->pid = pid;
 322         task->nr = nr_tasks;
 323         strcpy(task->comm, comm);
 324         /*
 325          * every task starts in sleeping state - this gets ignored
 326          * if there's no wakeup pointing to this sleep state:
 327          */
 328         add_sched_event_sleep(task, 0, 0);
 329
 330         pid_to_task[pid] = task;
 331         nr_tasks++;
 332         tasks = realloc(tasks, nr_tasks*sizeof(struct task_task *));
 333         BUG_ON(!tasks);
 334         tasks[task->nr] = task;
 335
 336         if (verbose)
 337                 printf("registered task #%ld, PID %ld (%s)\n", nr_tasks, pid, comm);
 338
 339         return task;
 340 }
 341
 342
 343 static void print_task_traces(void)
 344 {
 345         struct task_desc *task;
 346         unsigned long i;
 347
 348         for (i = 0; i < nr_tasks; i++) {
 349                 task = tasks[i];
 350                 printf("task %6ld (%20s:%10ld), nr_events: %ld\n",
 351                         task->nr, task->comm, task->pid, task->nr_events);
 352         }
 353 }
 354
 355 static void add_cross_task_wakeups(void)
 356 {
 357         struct task_desc *task1, *task2;
 358         unsigned long i, j;
 359
 360         for (i = 0; i < nr_tasks; i++) {
 361                 task1 = tasks[i];
 362                 j = i + 1;
 363                 if (j == nr_tasks)
 364                         j = 0;
 365                 task2 = tasks[j];
 366                 add_sched_event_wakeup(task1, 0, task2);
 367         }
 368 }
 369
 370 static void
 371 process_sched_event(struct task_desc *this_task __used, struct sched_atom *atom)
 372 {
 373         int ret = 0;
 374         u64 now;
 375         long long delta;
 376
 377         now = get_nsecs();
 378         delta = start_time + atom->timestamp - now;
 379
 380         switch (atom->type) {
 381                 case SCHED_EVENT_RUN:
 382                         burn_nsecs(atom->duration);
 383                         break;
 384                 case SCHED_EVENT_SLEEP:
 385                         if (atom->wait_sem)
 386                                 ret = sem_wait(atom->wait_sem);
 387                         BUG_ON(ret);
 388                         break;
 389                 case SCHED_EVENT_WAKEUP:
 390                         if (atom->wait_sem)
 391                                 ret = sem_post(atom->wait_sem);
 392                         BUG_ON(ret);
 393                         break;
 394                 case SCHED_EVENT_MIGRATION:
 395                         break;
 396                 default:
 397                         BUG_ON(1);
 398         }
 399 }
 400
 401 static u64 get_cpu_usage_nsec_parent(void)
 402 {
 403         struct rusage ru;
 404         u64 sum;
 405         int err;
 406
 407         err = getrusage(RUSAGE_SELF, &ru);
 408         BUG_ON(err);
 409
 410         sum =  ru.ru_utime.tv_sec*1e9 + ru.ru_utime.tv_usec*1e3;
 411         sum += ru.ru_stime.tv_sec*1e9 + ru.ru_stime.tv_usec*1e3;
 412
 413         return sum;
 414 }
 415
 416 static int self_open_counters(void)
 417 {
 418         struct perf_event_attr attr;
 419         int fd;
 420
 421         memset(&attr, 0, sizeof(attr));
 422
 423         attr.type = PERF_TYPE_SOFTWARE;
 424         attr.config = PERF_COUNT_SW_TASK_CLOCK;
 425
 426         fd = sys_perf_event_open(&attr, 0, -1, -1, 0);
 427
 428         if (fd < 0)
 429                 die("Error: sys_perf_event_open() syscall returned"
 430                     "with %d (%s)\n", fd, strerror(errno));
 431         return fd;
 432 }
 433
 434 static u64 get_cpu_usage_nsec_self(int fd)
 435 {
 436         u64 runtime;
 437         int ret;
 438
 439         ret = read(fd, &runtime, sizeof(runtime));
 440         BUG_ON(ret != sizeof(runtime));
 441
 442         return runtime;
 443 }
 444
 445 static void *thread_func(void *ctx)
 446 {
 447         struct task_desc *this_task = ctx;
 448         u64 cpu_usage_0, cpu_usage_1;
 449         unsigned long i, ret;
 450         char comm2[22];
 451         int fd;
 452
 453         sprintf(comm2, ":%s", this_task->comm);
 454         prctl(PR_SET_NAME, comm2);
 455         fd = self_open_counters();
 456
 457 again:
 458         ret = sem_post(&this_task->ready_for_work);
 459         BUG_ON(ret);
 460         ret = pthread_mutex_lock(&start_work_mutex);
 461         BUG_ON(ret);
 462         ret = pthread_mutex_unlock(&start_work_mutex);
 463         BUG_ON(ret);
 464
 465         cpu_usage_0 = get_cpu_usage_nsec_self(fd);
 466
 467         for (i = 0; i < this_task->nr_events; i++) {
 468                 this_task->curr_event = i;
 469                 process_sched_event(this_task, this_task->atoms[i]);
 470         }
 471
 472         cpu_usage_1 = get_cpu_usage_nsec_self(fd);
 473         this_task->cpu_usage = cpu_usage_1 - cpu_usage_0;
 474         ret = sem_post(&this_task->work_done_sem);
 475         BUG_ON(ret);
 476
 477         ret = pthread_mutex_lock(&work_done_wait_mutex);
 478         BUG_ON(ret);
 479         ret = pthread_mutex_unlock(&work_done_wait_mutex);
 480         BUG_ON(ret);
 481
 482         goto again;
 483 }
 484
 485 static void create_tasks(void)
 486 {
 487         struct task_desc *task;
 488         pthread_attr_t attr;
 489         unsigned long i;
 490         int err;
 491
 492         err = pthread_attr_init(&attr);
 493         BUG_ON(err);
 494         err = pthread_attr_setstacksize(&attr, (size_t)(16*1024));
 495         BUG_ON(err);
 496         err = pthread_mutex_lock(&start_work_mutex);
 497         BUG_ON(err);
 498         err = pthread_mutex_lock(&work_done_wait_mutex);
 499         BUG_ON(err);
 500         for (i = 0; i < nr_tasks; i++) {
 501                 task = tasks[i];
 502                 sem_init(&task->sleep_sem, 0, 0);
 503                 sem_init(&task->ready_for_work, 0, 0);
 504                 sem_init(&task->work_done_sem, 0, 0);
 505                 task->curr_event = 0;
 506                 err = pthread_create(&task->thread, &attr, thread_func, task);
 507                 BUG_ON(err);
 508         }
 509 }
 510
 511 static void wait_for_tasks(void)
 512 {
 513         u64 cpu_usage_0, cpu_usage_1;
 514         struct task_desc *task;
 515         unsigned long i, ret;
 516
 517         start_time = get_nsecs();
 518         cpu_usage = 0;
 519         pthread_mutex_unlock(&work_done_wait_mutex);
 520
 521         for (i = 0; i < nr_tasks; i++) {
 522                 task = tasks[i];
 523                 ret = sem_wait(&task->ready_for_work);
 524                 BUG_ON(ret);
 525                 sem_init(&task->ready_for_work, 0, 0);
 526         }
 527         ret = pthread_mutex_lock(&work_done_wait_mutex);
 528         BUG_ON(ret);
 529
 530         cpu_usage_0 = get_cpu_usage_nsec_parent();
 531
 532         pthread_mutex_unlock(&start_work_mutex);
 533
 534         for (i = 0; i < nr_tasks; i++) {
 535                 task = tasks[i];
 536                 ret = sem_wait(&task->work_done_sem);
 537                 BUG_ON(ret);
 538                 sem_init(&task->work_done_sem, 0, 0);
 539                 cpu_usage += task->cpu_usage;
 540                 task->cpu_usage = 0;
 541         }
 542
 543         cpu_usage_1 = get_cpu_usage_nsec_parent();
 544         if (!runavg_cpu_usage)
 545                 runavg_cpu_usage = cpu_usage;
 546         runavg_cpu_usage = (runavg_cpu_usage*9 + cpu_usage)/10;
 547
 548         parent_cpu_usage = cpu_usage_1 - cpu_usage_0;
 549         if (!runavg_parent_cpu_usage)
 550                 runavg_parent_cpu_usage = parent_cpu_usage;
 551         runavg_parent_cpu_usage = (runavg_parent_cpu_usage*9 +
 552                                    parent_cpu_usage)/10;
 553
 554         ret = pthread_mutex_lock(&start_work_mutex);
 555         BUG_ON(ret);
 556
 557         for (i = 0; i < nr_tasks; i++) {
 558                 task = tasks[i];
 559                 sem_init(&task->sleep_sem, 0, 0);
 560                 task->curr_event = 0;
 561         }
 562 }
 563
 564 static void run_one_test(void)
 565 {
 566         u64 T0, T1, delta, avg_delta, fluct, std_dev;
 567
 568         T0 = get_nsecs();
 569         wait_for_tasks();
 570         T1 = get_nsecs();
 571
 572         delta = T1 - T0;
 573         sum_runtime += delta;
 574         nr_runs++;
 575
 576         avg_delta = sum_runtime / nr_runs;
 577         if (delta < avg_delta)
 578                 fluct = avg_delta - delta;
 579         else
 580                 fluct = delta - avg_delta;
 581         sum_fluct += fluct;
 582         std_dev = sum_fluct / nr_runs / sqrt(nr_runs);
 583         if (!run_avg)
 584                 run_avg = delta;
 585         run_avg = (run_avg*9 + delta)/10;
 586
 587         printf("#%-3ld: %0.3f, ",
 588                 nr_runs, (double)delta/1000000.0);
 589
 590         printf("ravg: %0.2f, ",
 591                 (double)run_avg/1e6);
 592
 593         printf("cpu: %0.2f / %0.2f",
 594                 (double)cpu_usage/1e6, (double)runavg_cpu_usage/1e6);
 595
 596 #if 0
 597         /*
 598          * rusage statistics done by the parent, these are less
 599          * accurate than the sum_exec_runtime based statistics:
 600          */
 601         printf(" [%0.2f / %0.2f]",
 602                 (double)parent_cpu_usage/1e6,
 603                 (double)runavg_parent_cpu_usage/1e6);
 604 #endif
 605
 606         printf("\n");
 607
 608         if (nr_sleep_corrections)
 609                 printf(" (%ld sleep corrections)\n", nr_sleep_corrections);
 610         nr_sleep_corrections = 0;
 611 }
 612
 613 static void test_calibrations(void)
 614 {
 615         u64 T0, T1;
 616
 617         T0 = get_nsecs();
 618         burn_nsecs(1e6);
 619         T1 = get_nsecs();
 620
 621         printf("the run test took %Ld nsecs\n", T1-T0);
 622
 623         T0 = get_nsecs();
 624         sleep_nsecs(1e6);
 625         T1 = get_nsecs();
 626
 627         printf("the sleep test took %Ld nsecs\n", T1-T0);
 628 }
 629
 630 #define FILL_FIELD(ptr, field, event, data)     \
 631         ptr.field = (typeof(ptr.field)) raw_field_value(event, #field, data)
 632
 633 #define FILL_ARRAY(ptr, array, event, data)                     \
 634 do {                                                            \
 635         void *__array = raw_field_ptr(event, #array, data);     \
 636         memcpy(ptr.array, __array, sizeof(ptr.array));  \
 637 } while(0)
 638
 639 #define FILL_COMMON_FIELDS(ptr, event, data)                    \
 640 do {                                                            \
 641         FILL_FIELD(ptr, common_type, event, data);              \
 642         FILL_FIELD(ptr, common_flags, event, data);             \
 643         FILL_FIELD(ptr, common_preempt_count, event, data);     \
 644         FILL_FIELD(ptr, common_pid, event, data);               \
 645         FILL_FIELD(ptr, common_tgid, event, data);              \
 646 } while (0)
 647
 648
 649
 650 struct trace_switch_event {
 651         u32 size;
 652
 653         u16 common_type;
 654         u8 common_flags;
 655         u8 common_preempt_count;
 656         u32 common_pid;
 657         u32 common_tgid;
 658
 659         char prev_comm[16];
 660         u32 prev_pid;
 661         u32 prev_prio;
 662         u64 prev_state;
 663         char next_comm[16];
 664         u32 next_pid;
 665         u32 next_prio;
 666 };
 667
 668 struct trace_runtime_event {
 669         u32 size;
 670
 671         u16 common_type;
 672         u8 common_flags;
 673         u8 common_preempt_count;
 674         u32 common_pid;
 675         u32 common_tgid;
 676
 677         char comm[16];
 678         u32 pid;
 679         u64 runtime;
 680         u64 vruntime;
 681 };
 682
 683 struct trace_wakeup_event {
 684         u32 size;
 685
 686         u16 common_type;
 687         u8 common_flags;
 688         u8 common_preempt_count;
 689         u32 common_pid;
 690         u32 common_tgid;
 691
 692         char comm[16];
 693         u32 pid;
 694
 695         u32 prio;
 696         u32 success;
 697         u32 cpu;
 698 };
 699
 700 struct trace_fork_event {
 701         u32 size;
 702
 703         u16 common_type;
 704         u8 common_flags;
 705         u8 common_preempt_count;
 706         u32 common_pid;
 707         u32 common_tgid;
 708
 709         char parent_comm[16];
 710         u32 parent_pid;
 711         char child_comm[16];
 712         u32 child_pid;
 713 };
 714
 715 struct trace_migrate_task_event {
 716         u32 size;
 717
 718         u16 common_type;
 719         u8 common_flags;
 720         u8 common_preempt_count;
 721         u32 common_pid;
 722         u32 common_tgid;
 723
 724         char comm[16];
 725         u32 pid;
 726
 727         u32 prio;
 728         u32 cpu;
 729 };
 730
 731 struct trace_sched_handler {
 732         void (*switch_event)(struct trace_switch_event *,
 733                              struct perf_session *,
 734                              struct event *,
 735                              int cpu,
 736                              u64 timestamp,
 737                              struct thread *thread);
 738
 739         void (*runtime_event)(struct trace_runtime_event *,
 740                               struct perf_session *,
 741                               struct event *,
 742                               int cpu,
 743                               u64 timestamp,
 744                               struct thread *thread);
 745
 746         void (*wakeup_event)(struct trace_wakeup_event *,
 747                              struct perf_session *,
 748                              struct event *,
 749                              int cpu,
 750                              u64 timestamp,
 751                              struct thread *thread);
 752
 753         void (*fork_event)(struct trace_fork_event *,
 754                            struct event *,
 755                            int cpu,
 756                            u64 timestamp,
 757                            struct thread *thread);
 758
 759         void (*migrate_task_event)(struct trace_migrate_task_event *,
 760                            struct perf_session *session,
 761                            struct event *,
 762                            int cpu,
 763                            u64 timestamp,
 764                            struct thread *thread);
 765 };
 766
 767
 768 static void
 769 replay_wakeup_event(struct trace_wakeup_event *wakeup_event,
 770                     struct perf_session *session __used,
 771                     struct event *event,
 772                     int cpu __used,
 773                     u64 timestamp __used,
 774                     struct thread *thread __used)
 775 {
 776         struct task_desc *waker, *wakee;
 777
 778         if (verbose) {
 779                 printf("sched_wakeup event %p\n", event);
 780
 781                 printf(" ... pid %d woke up %s/%d\n",
 782                         wakeup_event->common_pid,
 783                         wakeup_event->comm,
 784                         wakeup_event->pid);
 785         }
 786
 787         waker = register_pid(wakeup_event->common_pid, "<unknown>");
 788         wakee = register_pid(wakeup_event->pid, wakeup_event->comm);
 789
 790         add_sched_event_wakeup(waker, timestamp, wakee);
 791 }
 792
 793 static u64 cpu_last_switched[MAX_CPUS];
 794
 795 static void
 796 replay_switch_event(struct trace_switch_event *switch_event,
 797                     struct perf_session *session __used,
 798                     struct event *event,
 799                     int cpu,
 800                     u64 timestamp,
 801                     struct thread *thread __used)
 802 {
 803         struct task_desc *prev, *next;
 804         u64 timestamp0;
 805         s64 delta;
 806
 807         if (verbose)
 808                 printf("sched_switch event %p\n", event);
 809
 810         if (cpu >= MAX_CPUS || cpu < 0)
 811                 return;
 812
 813         timestamp0 = cpu_last_switched[cpu];
 814         if (timestamp0)
 815                 delta = timestamp - timestamp0;
 816         else
 817                 delta = 0;
 818
 819         if (delta < 0)
 820                 die("hm, delta: %Ld < 0 ?\n", delta);
 821
 822         if (verbose) {
 823                 printf(" ... switch from %s/%d to %s/%d [ran %Ld nsecs]\n",
 824                         switch_event->prev_comm, switch_event->prev_pid,
 825                         switch_event->next_comm, switch_event->next_pid,
 826                         delta);
 827         }
 828
 829         prev = register_pid(switch_event->prev_pid, switch_event->prev_comm);
 830         next = register_pid(switch_event->next_pid, switch_event->next_comm);
 831
 832         cpu_last_switched[cpu] = timestamp;
 833
 834         add_sched_event_run(prev, timestamp, delta);
 835         add_sched_event_sleep(prev, timestamp, switch_event->prev_state);
 836 }
 837
 838
 839 static void
 840 replay_fork_event(struct trace_fork_event *fork_event,
 841                   struct event *event,
 842                   int cpu __used,
 843                   u64 timestamp __used,
 844                   struct thread *thread __used)
 845 {
 846         if (verbose) {
 847                 printf("sched_fork event %p\n", event);
 848                 printf("... parent: %s/%d\n", fork_event->parent_comm, fork_event->parent_pid);
 849                 printf("...  child: %s/%d\n", fork_event->child_comm, fork_event->child_pid);
 850         }
 851         register_pid(fork_event->parent_pid, fork_event->parent_comm);
 852         register_pid(fork_event->child_pid, fork_event->child_comm);
 853 }
 854
 855 static struct trace_sched_handler replay_ops  = {
 856         .wakeup_event           = replay_wakeup_event,
 857         .switch_event           = replay_switch_event,
 858         .fork_event             = replay_fork_event,
 859 };
 860
 861 struct sort_dimension {
 862         const char              *name;
 863         sort_fn_t               cmp;
 864         struct list_head        list;
 865 };
 866
 867 static LIST_HEAD(cmp_pid);
 868
 869 static int
 870 thread_lat_cmp(struct list_head *list, struct work_atoms *l, struct work_atoms *r)
 871 {
 872         struct sort_dimension *sort;
 873         int ret = 0;
 874
 875         BUG_ON(list_empty(list));
 876
 877         list_for_each_entry(sort, list, list) {
 878                 ret = sort->cmp(l, r);
 879                 if (ret)
 880                         return ret;
 881         }
 882
 883         return ret;
 884 }
 885
 886 static struct work_atoms *
 887 thread_atoms_search(struct rb_root *root, struct thread *thread,
 888                          struct list_head *sort_list)
 889 {
 890         struct rb_node *node = root->rb_node;
 891         struct work_atoms key = { .thread = thread };
 892
 893         while (node) {
 894                 struct work_atoms *atoms;
 895                 int cmp;
 896
 897                 atoms = container_of(node, struct work_atoms, node);
 898
 899                 cmp = thread_lat_cmp(sort_list, &key, atoms);
 900                 if (cmp > 0)
 901                         node = node->rb_left;
 902                 else if (cmp < 0)
 903                         node = node->rb_right;
 904                 else {
 905                         BUG_ON(thread != atoms->thread);
 906                         return atoms;
 907                 }
 908         }
 909         return NULL;
 910 }
 911
 912 static void
 913 __thread_latency_insert(struct rb_root *root, struct work_atoms *data,
 914                          struct list_head *sort_list)
 915 {
 916         struct rb_node **new = &(root->rb_node), *parent = NULL;
 917
 918         while (*new) {
 919                 struct work_atoms *this;
 920                 int cmp;
 921
 922                 this = container_of(*new, struct work_atoms, node);
 923                 parent = *new;
 924
 925                 cmp = thread_lat_cmp(sort_list, data, this);
 926
 927                 if (cmp > 0)
 928                         new = &((*new)->rb_left);
 929                 else
 930                         new = &((*new)->rb_right);
 931         }
 932
 933         rb_link_node(&data->node, parent, new);
 934         rb_insert_color(&data->node, root);
 935 }
 936
 937 static void thread_atoms_insert(struct thread *thread)
 938 {
 939         struct work_atoms *atoms = zalloc(sizeof(*atoms));
 940         if (!atoms)
 941                 die("No memory");
 942
 943         atoms->thread = thread;
 944         INIT_LIST_HEAD(&atoms->work_list);
 945         __thread_latency_insert(&atom_root, atoms, &cmp_pid);
 946 }
 947
 948 static void
 949 latency_fork_event(struct trace_fork_event *fork_event __used,
 950                    struct event *event __used,
 951                    int cpu __used,
 952                    u64 timestamp __used,
 953                    struct thread *thread __used)
 954 {
 955         /* should insert the newcomer */
 956 }
 957
 958 __used
 959 static char sched_out_state(struct trace_switch_event *switch_event)
 960 {
 961         const char *str = TASK_STATE_TO_CHAR_STR;
 962
 963         return str[switch_event->prev_state];
 964 }
 965
 966 static void
 967 add_sched_out_event(struct work_atoms *atoms,
 968                     char run_state,
 969                     u64 timestamp)
 970 {
 971         struct work_atom *atom = zalloc(sizeof(*atom));
 972         if (!atom)
 973                 die("Non memory");
 974
 975         atom->sched_out_time = timestamp;
 976
 977         if (run_state == 'R') {
 978                 atom->state = THREAD_WAIT_CPU;
 979                 atom->wake_up_time = atom->sched_out_time;
 980         }
 981
 982         list_add_tail(&atom->list, &atoms->work_list);
 983 }
 984
 985 static void
 986 add_runtime_event(struct work_atoms *atoms, u64 delta, u64 timestamp __used)
 987 {
 988         struct work_atom *atom;
 989
 990         BUG_ON(list_empty(&atoms->work_list));
 991
 992         atom = list_entry(atoms->work_list.prev, struct work_atom, list);
 993
 994         atom->runtime += delta;
 995         atoms->total_runtime += delta;
 996 }
 997
 998 static void
 999 add_sched_in_event(struct work_atoms *atoms, u64 timestamp)
1000 {
1001         struct work_atom *atom;
1002         u64 delta;
1003
1004         if (list_empty(&atoms->work_list))
1005                 return;
1006
1007         atom = list_entry(atoms->work_list.prev, struct work_atom, list);
1008
1009         if (atom->state != THREAD_WAIT_CPU)
1010                 return;
1011
1012         if (timestamp < atom->wake_up_time) {
1013                 atom->state = THREAD_IGNORE;
1014                 return;
1015         }
1016
1017         atom->state = THREAD_SCHED_IN;
1018         atom->sched_in_time = timestamp;
1019
1020         delta = atom->sched_in_time - atom->wake_up_time;
1021         atoms->total_lat += delta;
1022         if (delta > atoms->max_lat) {
1023                 atoms->max_lat = delta;
1024                 atoms->max_lat_at = timestamp;
1025         }
1026         atoms->nb_atoms++;
1027 }
1028
1029 static void
1030 latency_switch_event(struct trace_switch_event *switch_event,
1031                      struct perf_session *session,
1032                      struct event *event __used,
1033                      int cpu,
1034                      u64 timestamp,
1035                      struct thread *thread __used)
1036 {
1037         struct work_atoms *out_events, *in_events;
1038         struct thread *sched_out, *sched_in;
1039         u64 timestamp0;
1040         s64 delta;
1041
1042         BUG_ON(cpu >= MAX_CPUS || cpu < 0);
1043
1044         timestamp0 = cpu_last_switched[cpu];
1045         cpu_last_switched[cpu] = timestamp;
1046         if (timestamp0)
1047                 delta = timestamp - timestamp0;
1048         else
1049                 delta = 0;
1050
1051         if (delta < 0)
1052                 die("hm, delta: %Ld < 0 ?\n", delta);
1053
1054
1055         sched_out = perf_session__findnew(session, switch_event->prev_pid);
1056         sched_in = perf_session__findnew(session, switch_event->next_pid);
1057
1058         out_events = thread_atoms_search(&atom_root, sched_out, &cmp_pid);
1059         if (!out_events) {
1060                 thread_atoms_insert(sched_out);
1061                 out_events = thread_atoms_search(&atom_root, sched_out, &cmp_pid);
1062                 if (!out_events)
1063                         die("out-event: Internal tree error");
1064         }
1065         add_sched_out_event(out_events, sched_out_state(switch_event), timestamp);
1066
1067         in_events = thread_atoms_search(&atom_root, sched_in, &cmp_pid);
1068         if (!in_events) {
1069                 thread_atoms_insert(sched_in);
1070                 in_events = thread_atoms_search(&atom_root, sched_in, &cmp_pid);
1071                 if (!in_events)
1072                         die("in-event: Internal tree error");
1073                 /*
1074                  * Take came in we have not heard about yet,
1075                  * add in an initial atom in runnable state:
1076                  */
1077                 add_sched_out_event(in_events, 'R', timestamp);
1078         }
1079         add_sched_in_event(in_events, timestamp);
1080 }
1081
1082 static void
1083 latency_runtime_event(struct trace_runtime_event *runtime_event,
1084                      struct perf_session *session,
1085                      struct event *event __used,
1086                      int cpu,
1087                      u64 timestamp,
1088                      struct thread *this_thread __used)
1089 {
1090         struct thread *thread = perf_session__findnew(session, runtime_event->pid);
1091         struct work_atoms *atoms = thread_atoms_search(&atom_root, thread, &cmp_pid);
1092
1093         BUG_ON(cpu >= MAX_CPUS || cpu < 0);
1094         if (!atoms) {
1095                 thread_atoms_insert(thread);
1096                 atoms = thread_atoms_search(&atom_root, thread, &cmp_pid);
1097                 if (!atoms)
1098                         die("in-event: Internal tree error");
1099                 add_sched_out_event(atoms, 'R', timestamp);
1100         }
1101
1102         add_runtime_event(atoms, runtime_event->runtime, timestamp);
1103 }
1104
1105 static void
1106 latency_wakeup_event(struct trace_wakeup_event *wakeup_event,
1107                      struct perf_session *session,
1108                      struct event *__event __used,
1109                      int cpu __used,
1110                      u64 timestamp,
1111                      struct thread *thread __used)
1112 {
1113         struct work_atoms *atoms;
1114         struct work_atom *atom;
1115         struct thread *wakee;
1116
1117         /* Note for later, it may be interesting to observe the failing cases */
1118         if (!wakeup_event->success)
1119                 return;
1120
1121         wakee = perf_session__findnew(session, wakeup_event->pid);
1122         atoms = thread_atoms_search(&atom_root, wakee, &cmp_pid);
1123         if (!atoms) {
1124                 thread_atoms_insert(wakee);
1125                 atoms = thread_atoms_search(&atom_root, wakee, &cmp_pid);
1126                 if (!atoms)
1127                         die("wakeup-event: Internal tree error");
1128                 add_sched_out_event(atoms, 'S', timestamp);
1129         }
1130
1131         BUG_ON(list_empty(&atoms->work_list));
1132
1133         atom = list_entry(atoms->work_list.prev, struct work_atom, list);
1134
1135         /*
1136          * You WILL be missing events if you've recorded only
1137          * one CPU, or are only looking at only one, so don't
1138          * make useless noise.
1139          */
1140         if (profile_cpu == -1 && atom->state != THREAD_SLEEPING)
1141                 nr_state_machine_bugs++;
1142
1143         nr_timestamps++;
1144         if (atom->sched_out_time > timestamp) {
1145                 nr_unordered_timestamps++;
1146                 return;
1147         }
1148
1149         atom->state = THREAD_WAIT_CPU;
1150         atom->wake_up_time = timestamp;
1151 }
1152
1153 static void
1154 latency_migrate_task_event(struct trace_migrate_task_event *migrate_task_event,
1155                      struct perf_session *session,
1156                      struct event *__event __used,
1157                      int cpu __used,
1158                      u64 timestamp,
1159                      struct thread *thread __used)
1160 {
1161         struct work_atoms *atoms;
1162         struct work_atom *atom;
1163         struct thread *migrant;
1164
1165         /*
1166          * Only need to worry about migration when profiling one CPU.
1167          */
1168         if (profile_cpu == -1)
1169                 return;
1170
1171         migrant = perf_session__findnew(session, migrate_task_event->pid);
1172         atoms = thread_atoms_search(&atom_root, migrant, &cmp_pid);
1173         if (!atoms) {
1174                 thread_atoms_insert(migrant);
1175                 register_pid(migrant->pid, migrant->comm);
1176                 atoms = thread_atoms_search(&atom_root, migrant, &cmp_pid);
1177                 if (!atoms)
1178                         die("migration-event: Internal tree error");
1179                 add_sched_out_event(atoms, 'R', timestamp);
1180         }
1181
1182         BUG_ON(list_empty(&atoms->work_list));
1183
1184         atom = list_entry(atoms->work_list.prev, struct work_atom, list);
1185         atom->sched_in_time = atom->sched_out_time = atom->wake_up_time = timestamp;
1186
1187         nr_timestamps++;
1188
1189         if (atom->sched_out_time > timestamp)
1190                 nr_unordered_timestamps++;
1191 }
1192
1193 static struct trace_sched_handler lat_ops  = {
1194         .wakeup_event           = latency_wakeup_event,
1195         .switch_event           = latency_switch_event,
1196         .runtime_event          = latency_runtime_event,
1197         .fork_event             = latency_fork_event,
1198         .migrate_task_event     = latency_migrate_task_event,
1199 };
1200
1201 static void output_lat_thread(struct work_atoms *work_list)
1202 {
1203         int i;
1204         int ret;
1205         u64 avg;
1206
1207         if (!work_list->nb_atoms)
1208                 return;
1209         /*
1210          * Ignore idle threads:
1211          */
1212         if (!strcmp(work_list->thread->comm, "swapper"))
1213                 return;
1214
1215         all_runtime += work_list->total_runtime;
1216         all_count += work_list->nb_atoms;
1217
1218         ret = printf("  %s:%d ", work_list->thread->comm, work_list->thread->pid);
1219
1220         for (i = 0; i < 24 - ret; i++)
1221                 printf(" ");
1222
1223         avg = work_list->total_lat / work_list->nb_atoms;
1224
1225         printf("|%11.3f ms |%9llu | avg:%9.3f ms | max:%9.3f ms | max at: %9.6f s\n",
1226               (double)work_list->total_runtime / 1e6,
1227                  work_list->nb_atoms, (double)avg / 1e6,
1228                  (double)work_list->max_lat / 1e6,
1229                  (double)work_list->max_lat_at / 1e9);
1230 }
1231
1232 static int pid_cmp(struct work_atoms *l, struct work_atoms *r)
1233 {
1234         if (l->thread->pid < r->thread->pid)
1235                 return -1;
1236         if (l->thread->pid > r->thread->pid)
1237                 return 1;
1238
1239         return 0;
1240 }
1241
1242 static struct sort_dimension pid_sort_dimension = {
1243         .name                   = "pid",
1244         .cmp                    = pid_cmp,
1245 };
1246
1247 static int avg_cmp(struct work_atoms *l, struct work_atoms *r)
1248 {
1249         u64 avgl, avgr;
1250
1251         if (!l->nb_atoms)
1252                 return -1;
1253
1254         if (!r->nb_atoms)
1255                 return 1;
1256
1257         avgl = l->total_lat / l->nb_atoms;
1258         avgr = r->total_lat / r->nb_atoms;
1259
1260         if (avgl < avgr)
1261                 return -1;
1262         if (avgl > avgr)
1263                 return 1;
1264
1265         return 0;
1266 }
1267
1268 static struct sort_dimension avg_sort_dimension = {
1269         .name                   = "avg",
1270         .cmp                    = avg_cmp,
1271 };
1272
1273 static int max_cmp(struct work_atoms *l, struct work_atoms *r)
1274 {
1275         if (l->max_lat < r->max_lat)
1276                 return -1;
1277         if (l->max_lat > r->max_lat)
1278                 return 1;
1279
1280         return 0;
1281 }
1282
1283 static struct sort_dimension max_sort_dimension = {
1284         .name                   = "max",
1285         .cmp                    = max_cmp,
1286 };
1287
1288 static int switch_cmp(struct work_atoms *l, struct work_atoms *r)
1289 {
1290         if (l->nb_atoms < r->nb_atoms)
1291                 return -1;
1292         if (l->nb_atoms > r->nb_atoms)
1293                 return 1;
1294
1295         return 0;
1296 }
1297
1298 static struct sort_dimension switch_sort_dimension = {
1299         .name                   = "switch",
1300         .cmp                    = switch_cmp,
1301 };
1302
1303 static int runtime_cmp(struct work_atoms *l, struct work_atoms *r)
1304 {
1305         if (l->total_runtime < r->total_runtime)
1306                 return -1;
1307         if (l->total_runtime > r->total_runtime)
1308                 return 1;
1309
1310         return 0;
1311 }
1312
1313 static struct sort_dimension runtime_sort_dimension = {
1314         .name                   = "runtime",
1315         .cmp                    = runtime_cmp,
1316 };
1317
1318 static struct sort_dimension *available_sorts[] = {
1319         &pid_sort_dimension,
1320         &avg_sort_dimension,
1321         &max_sort_dimension,
1322         &switch_sort_dimension,
1323         &runtime_sort_dimension,
1324 };
1325
1326 #define NB_AVAILABLE_SORTS      (int)(sizeof(available_sorts) / sizeof(struct sort_dimension *))
1327
1328 static LIST_HEAD(sort_list);
1329
1330 static int sort_dimension__add(const char *tok, struct list_head *list)
1331 {
1332         int i;
1333
1334         for (i = 0; i < NB_AVAILABLE_SORTS; i++) {
1335                 if (!strcmp(available_sorts[i]->name, tok)) {
1336                         list_add_tail(&available_sorts[i]->list, list);
1337
1338                         return 0;
1339                 }
1340         }
1341
1342         return -1;
1343 }
1344
1345 static void setup_sorting(void);
1346
1347 static void sort_lat(void)
1348 {
1349         struct rb_node *node;
1350
1351         for (;;) {
1352                 struct work_atoms *data;
1353                 node = rb_first(&atom_root);
1354                 if (!node)
1355                         break;
1356
1357                 rb_erase(node, &atom_root);
1358                 data = rb_entry(node, struct work_atoms, node);
1359                 __thread_latency_insert(&sorted_atom_root, data, &sort_list);
1360         }
1361 }
1362
1363 static struct trace_sched_handler *trace_handler;
1364
1365 static void
1366 process_sched_wakeup_event(void *data, struct perf_session *session,
1367                            struct event *event,
1368                            int cpu __used,
1369                            u64 timestamp __used,
1370                            struct thread *thread __used)
1371 {
1372         struct trace_wakeup_event wakeup_event;
1373
1374         FILL_COMMON_FIELDS(wakeup_event, event, data);
1375
1376         FILL_ARRAY(wakeup_event, comm, event, data);
1377         FILL_FIELD(wakeup_event, pid, event, data);
1378         FILL_FIELD(wakeup_event, prio, event, data);
1379         FILL_FIELD(wakeup_event, success, event, data);
1380         FILL_FIELD(wakeup_event, cpu, event, data);
1381
1382         if (trace_handler->wakeup_event)
1383                 trace_handler->wakeup_event(&wakeup_event, session, event,
1384                                             cpu, timestamp, thread);
1385 }
1386
1387 /*
1388  * Track the current task - that way we can know whether there's any
1389  * weird events, such as a task being switched away that is not current.
1390  */
1391 static int max_cpu;
1392
1393 static u32 curr_pid[MAX_CPUS] = { [0 ... MAX_CPUS-1] = -1 };
1394
1395 static struct thread *curr_thread[MAX_CPUS];
1396
1397 static char next_shortname1 = 'A';
1398 static char next_shortname2 = '0';
1399
1400 static void
1401 map_switch_event(struct trace_switch_event *switch_event,
1402                  struct perf_session *session,
1403                  struct event *event __used,
1404                  int this_cpu,
1405                  u64 timestamp,
1406                  struct thread *thread __used)
1407 {
1408         struct thread *sched_out, *sched_in;
1409         int new_shortname;
1410         u64 timestamp0;
1411         s64 delta;
1412         int cpu;
1413
1414         BUG_ON(this_cpu >= MAX_CPUS || this_cpu < 0);
1415
1416         if (this_cpu > max_cpu)
1417                 max_cpu = this_cpu;
1418
1419         timestamp0 = cpu_last_switched[this_cpu];
1420         cpu_last_switched[this_cpu] = timestamp;
1421         if (timestamp0)
1422                 delta = timestamp - timestamp0;
1423         else
1424                 delta = 0;
1425
1426         if (delta < 0)
1427                 die("hm, delta: %Ld < 0 ?\n", delta);
1428
1429
1430         sched_out = perf_session__findnew(session, switch_event->prev_pid);
1431         sched_in = perf_session__findnew(session, switch_event->next_pid);
1432
1433         curr_thread[this_cpu] = sched_in;
1434
1435         printf("  ");
1436
1437         new_shortname = 0;
1438         if (!sched_in->shortname[0]) {
1439                 sched_in->shortname[0] = next_shortname1;
1440                 sched_in->shortname[1] = next_shortname2;
1441
1442                 if (next_shortname1 < 'Z') {
1443                         next_shortname1++;
1444                 } else {
1445                         next_shortname1='A';
1446                         if (next_shortname2 < '9') {
1447                                 next_shortname2++;
1448                         } else {
1449                                 next_shortname2='0';
1450                         }
1451                 }
1452                 new_shortname = 1;
1453         }
1454
1455         for (cpu = 0; cpu <= max_cpu; cpu++) {
1456                 if (cpu != this_cpu)
1457                         printf(" ");
1458                 else
1459                         printf("*");
1460
1461                 if (curr_thread[cpu]) {
1462                         if (curr_thread[cpu]->pid)
1463                                 printf("%2s ", curr_thread[cpu]->shortname);
1464                         else
1465                                 printf(".  ");
1466                 } else
1467                         printf("   ");
1468         }
1469
1470         printf("  %12.6f secs ", (double)timestamp/1e9);
1471         if (new_shortname) {
1472                 printf("%s => %s:%d\n",
1473                         sched_in->shortname, sched_in->comm, sched_in->pid);
1474         } else {
1475                 printf("\n");
1476         }
1477 }
1478
1479
1480 static void
1481 process_sched_switch_event(void *data, struct perf_session *session,
1482                            struct event *event,
1483                            int this_cpu,
1484                            u64 timestamp __used,
1485                            struct thread *thread __used)
1486 {
1487         struct trace_switch_event switch_event;
1488
1489         FILL_COMMON_FIELDS(switch_event, event, data);
1490
1491         FILL_ARRAY(switch_event, prev_comm, event, data);
1492         FILL_FIELD(switch_event, prev_pid, event, data);
1493         FILL_FIELD(switch_event, prev_prio, event, data);
1494         FILL_FIELD(switch_event, prev_state, event, data);
1495         FILL_ARRAY(switch_event, next_comm, event, data);
1496         FILL_FIELD(switch_event, next_pid, event, data);
1497         FILL_FIELD(switch_event, next_prio, event, data);
1498
1499         if (curr_pid[this_cpu] != (u32)-1) {
1500                 /*
1501                  * Are we trying to switch away a PID that is
1502                  * not current?
1503                  */
1504                 if (curr_pid[this_cpu] != switch_event.prev_pid)
1505                         nr_context_switch_bugs++;
1506         }
1507         if (trace_handler->switch_event)
1508                 trace_handler->switch_event(&switch_event, session, event,
1509                                             this_cpu, timestamp, thread);
1510
1511         curr_pid[this_cpu] = switch_event.next_pid;
1512 }
1513
1514 static void
1515 process_sched_runtime_event(void *data, struct perf_session *session,
1516                            struct event *event,
1517                            int cpu __used,
1518                            u64 timestamp __used,
1519                            struct thread *thread __used)
1520 {
1521         struct trace_runtime_event runtime_event;
1522
1523         FILL_ARRAY(runtime_event, comm, event, data);
1524         FILL_FIELD(runtime_event, pid, event, data);
1525         FILL_FIELD(runtime_event, runtime, event, data);
1526         FILL_FIELD(runtime_event, vruntime, event, data);
1527
1528         if (trace_handler->runtime_event)
1529                 trace_handler->runtime_event(&runtime_event, session, event, cpu, timestamp, thread);
1530 }
1531
1532 static void
1533 process_sched_fork_event(void *data,
1534                          struct event *event,
1535                          int cpu __used,
1536                          u64 timestamp __used,
1537                          struct thread *thread __used)
1538 {
1539         struct trace_fork_event fork_event;
1540
1541         FILL_COMMON_FIELDS(fork_event, event, data);
1542
1543         FILL_ARRAY(fork_event, parent_comm, event, data);
1544         FILL_FIELD(fork_event, parent_pid, event, data);
1545         FILL_ARRAY(fork_event, child_comm, event, data);
1546         FILL_FIELD(fork_event, child_pid, event, data);
1547
1548         if (trace_handler->fork_event)
1549                 trace_handler->fork_event(&fork_event, event,
1550                                           cpu, timestamp, thread);
1551 }
1552
1553 static void
1554 process_sched_exit_event(struct event *event,
1555                          int cpu __used,
1556                          u64 timestamp __used,
1557                          struct thread *thread __used)
1558 {
1559         if (verbose)
1560                 printf("sched_exit event %p\n", event);
1561 }
1562
1563 static void
1564 process_sched_migrate_task_event(void *data, struct perf_session *session,
1565                            struct event *event,
1566                            int cpu __used,
1567                            u64 timestamp __used,
1568                            struct thread *thread __used)
1569 {
1570         struct trace_migrate_task_event migrate_task_event;
1571
1572         FILL_COMMON_FIELDS(migrate_task_event, event, data);
1573
1574         FILL_ARRAY(migrate_task_event, comm, event, data);
1575         FILL_FIELD(migrate_task_event, pid, event, data);
1576         FILL_FIELD(migrate_task_event, prio, event, data);
1577         FILL_FIELD(migrate_task_event, cpu, event, data);
1578
1579         if (trace_handler->migrate_task_event)
1580                 trace_handler->migrate_task_event(&migrate_task_event, session,
1581                                                  event, cpu, timestamp, thread);
1582 }
1583
1584 static void
1585 process_raw_event(event_t *raw_event __used, struct perf_session *session,
1586                   void *data, int cpu, u64 timestamp, struct thread *thread)
1587 {
1588         struct event *event;
1589         int type;
1590
1591
1592         type = trace_parse_common_type(data);
1593         event = trace_find_event(type);
1594
1595         if (!strcmp(event->name, "sched_switch"))
1596                 process_sched_switch_event(data, session, event, cpu, timestamp, thread);
1597         if (!strcmp(event->name, "sched_stat_runtime"))
1598                 process_sched_runtime_event(data, session, event, cpu, timestamp, thread);
1599         if (!strcmp(event->name, "sched_wakeup"))
1600                 process_sched_wakeup_event(data, session, event, cpu, timestamp, thread);
1601         if (!strcmp(event->name, "sched_wakeup_new"))
1602                 process_sched_wakeup_event(data, session, event, cpu, timestamp, thread);
1603         if (!strcmp(event->name, "sched_process_fork"))
1604                 process_sched_fork_event(data, event, cpu, timestamp, thread);
1605         if (!strcmp(event->name, "sched_process_exit"))
1606                 process_sched_exit_event(event, cpu, timestamp, thread);
1607         if (!strcmp(event->name, "sched_migrate_task"))
1608                 process_sched_migrate_task_event(data, session, event, cpu, timestamp, thread);
1609 }
1610
1611 static int process_sample_event(event_t *event, struct perf_session *session)
1612 {
1613         struct sample_data data;
1614         struct thread *thread;
1615
1616         if (!(sample_type & PERF_SAMPLE_RAW))
1617                 return 0;
1618
1619         memset(&data, 0, sizeof(data));
1620         data.time = -1;
1621         data.cpu = -1;
1622         data.period = -1;
1623
1624         event__parse_sample(event, sample_type, &data);
1625
1626         dump_printf("(IP, %d): %d/%d: %p period: %Ld\n",
1627                 event->header.misc,
1628                 data.pid, data.tid,
1629                 (void *)(long)data.ip,
1630                 (long long)data.period);
1631
1632         thread = perf_session__findnew(session, data.pid);
1633         if (thread == NULL) {
1634                 pr_debug("problem processing %d event, skipping it.\n",
1635                          event->header.type);
1636                 return -1;
1637         }
1638
1639         dump_printf(" ... thread: %s:%d\n", thread->comm, thread->pid);
1640
1641         if (profile_cpu != -1 && profile_cpu != (int)data.cpu)
1642                 return 0;
1643
1644         process_raw_event(event, session, data.raw_data, data.cpu, data.time, thread);
1645
1646         return 0;
1647 }
1648
1649 static int process_lost_event(event_t *event __used,
1650                               struct perf_session *session __used)
1651 {
1652         nr_lost_chunks++;
1653         nr_lost_events += event->lost.lost;
1654
1655         return 0;
1656 }
1657
1658 static int sample_type_check(u64 type)
1659 {
1660         sample_type = type;
1661
1662         if (!(sample_type & PERF_SAMPLE_RAW)) {
1663                 fprintf(stderr,
1664                         "No trace sample to read. Did you call perf record "
1665                         "without -R?");
1666                 return -1;
1667         }
1668
1669         return 0;
1670 }
1671
1672 static struct perf_event_ops event_ops = {
1673         .process_sample_event   = process_sample_event,
1674         .process_comm_event     = event__process_comm,
1675         .process_lost_event     = process_lost_event,
1676         .sample_type_check      = sample_type_check,
1677 };
1678
1679 static int read_events(void)
1680 {
1681         int err;
1682         struct perf_session *session = perf_session__new(input_name, O_RDONLY,
1683                                                          0, NULL);
1684         if (session == NULL)
1685                 return -ENOMEM;
1686
1687         err = perf_session__process_events(session, &event_ops);
1688         perf_session__delete(session);
1689         return err;
1690 }
1691
1692 static void print_bad_events(void)
1693 {
1694         if (nr_unordered_timestamps && nr_timestamps) {
1695                 printf("  INFO: %.3f%% unordered timestamps (%ld out of %ld)\n",
1696                         (double)nr_unordered_timestamps/(double)nr_timestamps*100.0,
1697                         nr_unordered_timestamps, nr_timestamps);
1698         }
1699         if (nr_lost_events && nr_events) {
1700                 printf("  INFO: %.3f%% lost events (%ld out of %ld, in %ld chunks)\n",
1701                         (double)nr_lost_events/(double)nr_events*100.0,
1702                         nr_lost_events, nr_events, nr_lost_chunks);
1703         }
1704         if (nr_state_machine_bugs && nr_timestamps) {
1705                 printf("  INFO: %.3f%% state machine bugs (%ld out of %ld)",
1706                         (double)nr_state_machine_bugs/(double)nr_timestamps*100.0,
1707                         nr_state_machine_bugs, nr_timestamps);
1708                 if (nr_lost_events)
1709                         printf(" (due to lost events?)");
1710                 printf("\n");
1711         }
1712         if (nr_context_switch_bugs && nr_timestamps) {
1713                 printf("  INFO: %.3f%% context switch bugs (%ld out of %ld)",
1714                         (double)nr_context_switch_bugs/(double)nr_timestamps*100.0,
1715                         nr_context_switch_bugs, nr_timestamps);
1716                 if (nr_lost_events)
1717                         printf(" (due to lost events?)");
1718                 printf("\n");
1719         }
1720 }
1721
1722 static void __cmd_lat(void)
1723 {
1724         struct rb_node *next;
1725
1726         setup_pager();
1727         read_events();
1728         sort_lat();
1729
1730         printf("\n ---------------------------------------------------------------------------------------------------------------\n");
1731         printf("  Task                  |   Runtime ms  | Switches | Average delay ms | Maximum delay ms | Maximum delay at     |\n");
1732         printf(" ---------------------------------------------------------------------------------------------------------------\n");
1733
1734         next = rb_first(&sorted_atom_root);
1735
1736         while (next) {
1737                 struct work_atoms *work_list;
1738
1739                 work_list = rb_entry(next, struct work_atoms, node);
1740                 output_lat_thread(work_list);
1741                 next = rb_next(next);
1742         }
1743
1744         printf(" -----------------------------------------------------------------------------------------\n");
1745         printf("  TOTAL:                |%11.3f ms |%9Ld |\n",
1746                 (double)all_runtime/1e6, all_count);
1747
1748         printf(" ---------------------------------------------------\n");
1749
1750         print_bad_events();
1751         printf("\n");
1752
1753 }
1754
1755 static struct trace_sched_handler map_ops  = {
1756         .wakeup_event           = NULL,
1757         .switch_event           = map_switch_event,
1758         .runtime_event          = NULL,
1759         .fork_event             = NULL,
1760 };
1761
1762 static void __cmd_map(void)
1763 {
1764         max_cpu = sysconf(_SC_NPROCESSORS_CONF);
1765
1766         setup_pager();
1767         read_events();
1768         print_bad_events();
1769 }
1770
1771 static void __cmd_replay(void)
1772 {
1773         unsigned long i;
1774
1775         calibrate_run_measurement_overhead();
1776         calibrate_sleep_measurement_overhead();
1777
1778         test_calibrations();
1779
1780         read_events();
1781
1782         printf("nr_run_events:        %ld\n", nr_run_events);
1783         printf("nr_sleep_events:      %ld\n", nr_sleep_events);
1784         printf("nr_wakeup_events:     %ld\n", nr_wakeup_events);
1785
1786         if (targetless_wakeups)
1787                 printf("target-less wakeups:  %ld\n", targetless_wakeups);
1788         if (multitarget_wakeups)
1789                 printf("multi-target wakeups: %ld\n", multitarget_wakeups);
1790         if (nr_run_events_optimized)
1791                 printf("run atoms optimized: %ld\n",
1792                         nr_run_events_optimized);
1793
1794         print_task_traces();
1795         add_cross_task_wakeups();
1796
1797         create_tasks();
1798         printf("------------------------------------------------------------\n");
1799         for (i = 0; i < replay_repeat; i++)
1800                 run_one_test();
1801 }
1802
1803
1804 static const char * const sched_usage[] = {
1805         "perf sched [<options>] {record|latency|map|replay|trace}",
1806         NULL
1807 };
1808
1809 static const struct option sched_options[] = {
1810         OPT_STRING('i', "input", &input_name, "file",
1811                     "input file name"),
1812         OPT_BOOLEAN('v', "verbose", &verbose,
1813                     "be more verbose (show symbol address, etc)"),
1814         OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
1815                     "dump raw trace in ASCII"),
1816         OPT_END()
1817 };
1818
1819 static const char * const latency_usage[] = {
1820         "perf sched latency [<options>]",
1821         NULL
1822 };
1823
1824 static const struct option latency_options[] = {
1825         OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
1826                    "sort by key(s): runtime, switch, avg, max"),
1827         OPT_BOOLEAN('v', "verbose", &verbose,
1828                     "be more verbose (show symbol address, etc)"),
1829         OPT_INTEGER('C', "CPU", &profile_cpu,
1830                     "CPU to profile on"),
1831         OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
1832                     "dump raw trace in ASCII"),
1833         OPT_END()
1834 };
1835
1836 static const char * const replay_usage[] = {
1837         "perf sched replay [<options>]",
1838         NULL
1839 };
1840
1841 static const struct option replay_options[] = {
1842         OPT_INTEGER('r', "repeat", &replay_repeat,
1843                     "repeat the workload replay N times (-1: infinite)"),
1844         OPT_BOOLEAN('v', "verbose", &verbose,
1845                     "be more verbose (show symbol address, etc)"),
1846         OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
1847                     "dump raw trace in ASCII"),
1848         OPT_END()
1849 };
1850
1851 static void setup_sorting(void)
1852 {
1853         char *tmp, *tok, *str = strdup(sort_order);
1854
1855         for (tok = strtok_r(str, ", ", &tmp);
1856                         tok; tok = strtok_r(NULL, ", ", &tmp)) {
1857                 if (sort_dimension__add(tok, &sort_list) < 0) {
1858                         error("Unknown --sort key: `%s'", tok);
1859                         usage_with_options(latency_usage, latency_options);
1860                 }
1861         }
1862
1863         free(str);
1864
1865         sort_dimension__add("pid", &cmp_pid);
1866 }
1867
1868 static const char *record_args[] = {
1869         "record",
1870         "-a",
1871         "-R",
1872         "-M",
1873         "-f",
1874         "-m", "1024",
1875         "-c", "1",
1876         "-e", "sched:sched_switch:r",
1877         "-e", "sched:sched_stat_wait:r",
1878         "-e", "sched:sched_stat_sleep:r",
1879         "-e", "sched:sched_stat_iowait:r",
1880         "-e", "sched:sched_stat_runtime:r",
1881         "-e", "sched:sched_process_exit:r",
1882         "-e", "sched:sched_process_fork:r",
1883         "-e", "sched:sched_wakeup:r",
1884         "-e", "sched:sched_migrate_task:r",
1885 };
1886
1887 static int __cmd_record(int argc, const char **argv)
1888 {
1889         unsigned int rec_argc, i, j;
1890         const char **rec_argv;
1891
1892         rec_argc = ARRAY_SIZE(record_args) + argc - 1;
1893         rec_argv = calloc(rec_argc + 1, sizeof(char *));
1894
1895         for (i = 0; i < ARRAY_SIZE(record_args); i++)
1896                 rec_argv[i] = strdup(record_args[i]);
1897
1898         for (j = 1; j < (unsigned int)argc; j++, i++)
1899                 rec_argv[i] = argv[j];
1900
1901         BUG_ON(i != rec_argc);
1902
1903         return cmd_record(i, rec_argv, NULL);
1904 }
1905
1906 int cmd_sched(int argc, const char **argv, const char *prefix __used)
1907 {
1908         argc = parse_options(argc, argv, sched_options, sched_usage,
1909                              PARSE_OPT_STOP_AT_NON_OPTION);
1910         if (!argc)
1911                 usage_with_options(sched_usage, sched_options);
1912
1913         /*
1914          * Aliased to 'perf trace' for now:
1915          */
1916         if (!strcmp(argv[0], "trace"))
1917                 return cmd_trace(argc, argv, prefix);
1918
1919         symbol__init(0);
1920         if (!strncmp(argv[0], "rec", 3)) {
1921                 return __cmd_record(argc, argv);
1922         } else if (!strncmp(argv[0], "lat", 3)) {
1923                 trace_handler = &lat_ops;
1924                 if (argc > 1) {
1925                         argc = parse_options(argc, argv, latency_options, latency_usage, 0);
1926                         if (argc)
1927                                 usage_with_options(latency_usage, latency_options);
1928                 }
1929                 setup_sorting();
1930                 __cmd_lat();
1931         } else if (!strcmp(argv[0], "map")) {
1932                 trace_handler = &map_ops;
1933                 setup_sorting();
1934                 __cmd_map();
1935         } else if (!strncmp(argv[0], "rep", 3)) {
1936                 trace_handler = &replay_ops;
1937                 if (argc) {
1938                         argc = parse_options(argc, argv, replay_options, replay_usage, 0);
1939                         if (argc)
1940                                 usage_with_options(replay_usage, replay_options);
1941                 }
1942                 __cmd_replay();
1943         } else {
1944                 usage_with_options(sched_usage, sched_options);
1945         }
1946
1947         return 0;
1948 }