tools/perf/builtin-sched.c

   1 #include "builtin.h"
   2
   3 #include "util/util.h"
   4 #include "util/cache.h"
   5 #include "util/symbol.h"
   6 #include "util/thread.h"
   7 #include "util/header.h"
   8
   9 #include "util/parse-options.h"
  10
  11 #include "perf.h"
  12 #include "util/debug.h"
  13
  14 #include "util/trace-event.h"
  15 #include <sys/types.h>
  16
  17
  18 #define MAX_CPUS 4096
  19
  20 static char                     const *input_name = "perf.data";
  21 static int                      input;
  22 static unsigned long            page_size;
  23 static unsigned long            mmap_window = 32;
  24
  25 static unsigned long            total_comm = 0;
  26
  27 static struct rb_root           threads;
  28 static struct thread            *last_match;
  29
  30 static struct perf_header       *header;
  31 static u64                      sample_type;
  32
  33 static int                      replay_mode;
  34 static int                      lat_mode;
  35
  36
  37 /*
  38  * Scheduler benchmarks
  39  */
  40 #include <sys/resource.h>
  41 #include <sys/types.h>
  42 #include <sys/stat.h>
  43 #include <sys/time.h>
  44 #include <sys/prctl.h>
  45
  46 #include <linux/unistd.h>
  47
  48 #include <semaphore.h>
  49 #include <pthread.h>
  50 #include <signal.h>
  51 #include <values.h>
  52 #include <string.h>
  53 #include <unistd.h>
  54 #include <stdlib.h>
  55 #include <assert.h>
  56 #include <fcntl.h>
  57 #include <time.h>
  58 #include <math.h>
  59
  60 #include <stdio.h>
  61
  62 #define PR_SET_NAME     15               /* Set process name */
  63
  64 #define BUG_ON(x)       assert(!(x))
  65
  66 #define DEBUG           0
  67
  68 typedef unsigned long long nsec_t;
  69
  70 static nsec_t run_measurement_overhead;
  71 static nsec_t sleep_measurement_overhead;
  72
  73 static nsec_t get_nsecs(void)
  74 {
  75         struct timespec ts;
  76
  77         clock_gettime(CLOCK_MONOTONIC, &ts);
  78
  79         return ts.tv_sec * 1000000000ULL + ts.tv_nsec;
  80 }
  81
  82 static void burn_nsecs(nsec_t nsecs)
  83 {
  84         nsec_t T0 = get_nsecs(), T1;
  85
  86         do {
  87                 T1 = get_nsecs();
  88         } while (T1 + run_measurement_overhead < T0 + nsecs);
  89 }
  90
  91 static void sleep_nsecs(nsec_t nsecs)
  92 {
  93         struct timespec ts;
  94
  95         ts.tv_nsec = nsecs % 999999999;
  96         ts.tv_sec = nsecs / 999999999;
  97
  98         nanosleep(&ts, NULL);
  99 }
 100
 101 static void calibrate_run_measurement_overhead(void)
 102 {
 103         nsec_t T0, T1, delta, min_delta = 1000000000ULL;
 104         int i;
 105
 106         for (i = 0; i < 10; i++) {
 107                 T0 = get_nsecs();
 108                 burn_nsecs(0);
 109                 T1 = get_nsecs();
 110                 delta = T1-T0;
 111                 min_delta = min(min_delta, delta);
 112         }
 113         run_measurement_overhead = min_delta;
 114
 115         printf("run measurement overhead: %Ld nsecs\n", min_delta);
 116 }
 117
 118 static void calibrate_sleep_measurement_overhead(void)
 119 {
 120         nsec_t T0, T1, delta, min_delta = 1000000000ULL;
 121         int i;
 122
 123         for (i = 0; i < 10; i++) {
 124                 T0 = get_nsecs();
 125                 sleep_nsecs(10000);
 126                 T1 = get_nsecs();
 127                 delta = T1-T0;
 128                 min_delta = min(min_delta, delta);
 129         }
 130         min_delta -= 10000;
 131         sleep_measurement_overhead = min_delta;
 132
 133         printf("sleep measurement overhead: %Ld nsecs\n", min_delta);
 134 }
 135
 136 #define COMM_LEN        20
 137 #define SYM_LEN         129
 138
 139 #define MAX_PID         65536
 140
 141 static unsigned long nr_tasks;
 142
 143 struct sched_event;
 144
 145 struct task_desc {
 146         unsigned long           nr;
 147         unsigned long           pid;
 148         char                    comm[COMM_LEN];
 149
 150         unsigned long           nr_events;
 151         unsigned long           curr_event;
 152         struct sched_event      **events;
 153
 154         pthread_t               thread;
 155         sem_t                   sleep_sem;
 156
 157         sem_t                   ready_for_work;
 158         sem_t                   work_done_sem;
 159
 160         nsec_t                  cpu_usage;
 161 };
 162
 163 enum sched_event_type {
 164         SCHED_EVENT_RUN,
 165         SCHED_EVENT_SLEEP,
 166         SCHED_EVENT_WAKEUP,
 167 };
 168
 169 struct sched_event {
 170         enum sched_event_type   type;
 171         nsec_t                  timestamp;
 172         nsec_t                  duration;
 173         unsigned long           nr;
 174         int                     specific_wait;
 175         sem_t                   *wait_sem;
 176         struct task_desc        *wakee;
 177 };
 178
 179 static struct task_desc         *pid_to_task[MAX_PID];
 180
 181 static struct task_desc         **tasks;
 182
 183 static pthread_mutex_t          start_work_mutex = PTHREAD_MUTEX_INITIALIZER;
 184 static nsec_t                   start_time;
 185
 186 static pthread_mutex_t          work_done_wait_mutex = PTHREAD_MUTEX_INITIALIZER;
 187
 188 static unsigned long            nr_run_events;
 189 static unsigned long            nr_sleep_events;
 190 static unsigned long            nr_wakeup_events;
 191
 192 static unsigned long            nr_sleep_corrections;
 193 static unsigned long            nr_run_events_optimized;
 194
 195 static struct sched_event *
 196 get_new_event(struct task_desc *task, nsec_t timestamp)
 197 {
 198         struct sched_event *event = calloc(1, sizeof(*event));
 199         unsigned long idx = task->nr_events;
 200         size_t size;
 201
 202         event->timestamp = timestamp;
 203         event->nr = idx;
 204
 205         task->nr_events++;
 206         size = sizeof(struct sched_event *) * task->nr_events;
 207         task->events = realloc(task->events, size);
 208         BUG_ON(!task->events);
 209
 210         task->events[idx] = event;
 211
 212         return event;
 213 }
 214
 215 static struct sched_event *last_event(struct task_desc *task)
 216 {
 217         if (!task->nr_events)
 218                 return NULL;
 219
 220         return task->events[task->nr_events - 1];
 221 }
 222
 223 static void
 224 add_sched_event_run(struct task_desc *task, nsec_t timestamp, u64 duration)
 225 {
 226         struct sched_event *event, *curr_event = last_event(task);
 227
 228         /*
 229          * optimize an existing RUN event by merging this one
 230          * to it:
 231          */
 232         if (curr_event && curr_event->type == SCHED_EVENT_RUN) {
 233                 nr_run_events_optimized++;
 234                 curr_event->duration += duration;
 235                 return;
 236         }
 237
 238         event = get_new_event(task, timestamp);
 239
 240         event->type = SCHED_EVENT_RUN;
 241         event->duration = duration;
 242
 243         nr_run_events++;
 244 }
 245
 246 static unsigned long targetless_wakeups;
 247 static unsigned long multitarget_wakeups;
 248
 249 static void
 250 add_sched_event_wakeup(struct task_desc *task, nsec_t timestamp,
 251                        struct task_desc *wakee)
 252 {
 253         struct sched_event *event, *wakee_event;
 254
 255         event = get_new_event(task, timestamp);
 256         event->type = SCHED_EVENT_WAKEUP;
 257         event->wakee = wakee;
 258
 259         wakee_event = last_event(wakee);
 260         if (!wakee_event || wakee_event->type != SCHED_EVENT_SLEEP) {
 261                 targetless_wakeups++;
 262                 return;
 263         }
 264         if (wakee_event->wait_sem) {
 265                 multitarget_wakeups++;
 266                 return;
 267         }
 268
 269         wakee_event->wait_sem = calloc(1, sizeof(*wakee_event->wait_sem));
 270         sem_init(wakee_event->wait_sem, 0, 0);
 271         wakee_event->specific_wait = 1;
 272         event->wait_sem = wakee_event->wait_sem;
 273
 274         nr_wakeup_events++;
 275 }
 276
 277 static void
 278 add_sched_event_sleep(struct task_desc *task, nsec_t timestamp,
 279                       u64 task_state __used)
 280 {
 281         struct sched_event *event = get_new_event(task, timestamp);
 282
 283         event->type = SCHED_EVENT_SLEEP;
 284
 285         nr_sleep_events++;
 286 }
 287
 288 static struct task_desc *register_pid(unsigned long pid, const char *comm)
 289 {
 290         struct task_desc *task;
 291
 292         BUG_ON(pid >= MAX_PID);
 293
 294         task = pid_to_task[pid];
 295
 296         if (task)
 297                 return task;
 298
 299         task = calloc(1, sizeof(*task));
 300         task->pid = pid;
 301         task->nr = nr_tasks;
 302         strcpy(task->comm, comm);
 303         /*
 304          * every task starts in sleeping state - this gets ignored
 305          * if there's no wakeup pointing to this sleep state:
 306          */
 307         add_sched_event_sleep(task, 0, 0);
 308
 309         pid_to_task[pid] = task;
 310         nr_tasks++;
 311         tasks = realloc(tasks, nr_tasks*sizeof(struct task_task *));
 312         BUG_ON(!tasks);
 313         tasks[task->nr] = task;
 314
 315         if (verbose)
 316                 printf("registered task #%ld, PID %ld (%s)\n", nr_tasks, pid, comm);
 317
 318         return task;
 319 }
 320
 321
 322 static void print_task_traces(void)
 323 {
 324         struct task_desc *task;
 325         unsigned long i;
 326
 327         for (i = 0; i < nr_tasks; i++) {
 328                 task = tasks[i];
 329                 printf("task %6ld (%20s:%10ld), nr_events: %ld\n",
 330                         task->nr, task->comm, task->pid, task->nr_events);
 331         }
 332 }
 333
 334 static void add_cross_task_wakeups(void)
 335 {
 336         struct task_desc *task1, *task2;
 337         unsigned long i, j;
 338
 339         for (i = 0; i < nr_tasks; i++) {
 340                 task1 = tasks[i];
 341                 j = i + 1;
 342                 if (j == nr_tasks)
 343                         j = 0;
 344                 task2 = tasks[j];
 345                 add_sched_event_wakeup(task1, 0, task2);
 346         }
 347 }
 348
 349 static void
 350 process_sched_event(struct task_desc *this_task __used, struct sched_event *event)
 351 {
 352         int ret = 0;
 353         nsec_t now;
 354         long long delta;
 355
 356         now = get_nsecs();
 357         delta = start_time + event->timestamp - now;
 358
 359         switch (event->type) {
 360                 case SCHED_EVENT_RUN:
 361                         burn_nsecs(event->duration);
 362                         break;
 363                 case SCHED_EVENT_SLEEP:
 364                         if (event->wait_sem)
 365                                 ret = sem_wait(event->wait_sem);
 366                         BUG_ON(ret);
 367                         break;
 368                 case SCHED_EVENT_WAKEUP:
 369                         if (event->wait_sem)
 370                                 ret = sem_post(event->wait_sem);
 371                         BUG_ON(ret);
 372                         break;
 373                 default:
 374                         BUG_ON(1);
 375         }
 376 }
 377
 378 static nsec_t get_cpu_usage_nsec_parent(void)
 379 {
 380         struct rusage ru;
 381         nsec_t sum;
 382         int err;
 383
 384         err = getrusage(RUSAGE_SELF, &ru);
 385         BUG_ON(err);
 386
 387         sum =  ru.ru_utime.tv_sec*1e9 + ru.ru_utime.tv_usec*1e3;
 388         sum += ru.ru_stime.tv_sec*1e9 + ru.ru_stime.tv_usec*1e3;
 389
 390         return sum;
 391 }
 392
 393 static nsec_t get_cpu_usage_nsec_self(void)
 394 {
 395         char filename [] = "/proc/1234567890/sched";
 396         unsigned long msecs, nsecs;
 397         char *line = NULL;
 398         nsec_t total = 0;
 399         size_t len = 0;
 400         ssize_t chars;
 401         FILE *file;
 402         int ret;
 403
 404         sprintf(filename, "/proc/%d/sched", getpid());
 405         file = fopen(filename, "r");
 406         BUG_ON(!file);
 407
 408         while ((chars = getline(&line, &len, file)) != -1) {
 409                 ret = sscanf(line, "se.sum_exec_runtime : %ld.%06ld\n",
 410                         &msecs, &nsecs);
 411                 if (ret == 2) {
 412                         total = msecs*1e6 + nsecs;
 413                         break;
 414                 }
 415         }
 416         if (line)
 417                 free(line);
 418         fclose(file);
 419
 420         return total;
 421 }
 422
 423 static void *thread_func(void *ctx)
 424 {
 425         struct task_desc *this_task = ctx;
 426         nsec_t cpu_usage_0, cpu_usage_1;
 427         unsigned long i, ret;
 428         char comm2[22];
 429
 430         sprintf(comm2, ":%s", this_task->comm);
 431         prctl(PR_SET_NAME, comm2);
 432
 433 again:
 434         ret = sem_post(&this_task->ready_for_work);
 435         BUG_ON(ret);
 436         ret = pthread_mutex_lock(&start_work_mutex);
 437         BUG_ON(ret);
 438         ret = pthread_mutex_unlock(&start_work_mutex);
 439         BUG_ON(ret);
 440
 441         cpu_usage_0 = get_cpu_usage_nsec_self();
 442
 443         for (i = 0; i < this_task->nr_events; i++) {
 444                 this_task->curr_event = i;
 445                 process_sched_event(this_task, this_task->events[i]);
 446         }
 447
 448         cpu_usage_1 = get_cpu_usage_nsec_self();
 449         this_task->cpu_usage = cpu_usage_1 - cpu_usage_0;
 450
 451         ret = sem_post(&this_task->work_done_sem);
 452         BUG_ON(ret);
 453
 454         ret = pthread_mutex_lock(&work_done_wait_mutex);
 455         BUG_ON(ret);
 456         ret = pthread_mutex_unlock(&work_done_wait_mutex);
 457         BUG_ON(ret);
 458
 459         goto again;
 460 }
 461
 462 static void create_tasks(void)
 463 {
 464         struct task_desc *task;
 465         pthread_attr_t attr;
 466         unsigned long i;
 467         int err;
 468
 469         err = pthread_attr_init(&attr);
 470         BUG_ON(err);
 471         err = pthread_attr_setstacksize(&attr, (size_t)(16*1024));
 472         BUG_ON(err);
 473         err = pthread_mutex_lock(&start_work_mutex);
 474         BUG_ON(err);
 475         err = pthread_mutex_lock(&work_done_wait_mutex);
 476         BUG_ON(err);
 477         for (i = 0; i < nr_tasks; i++) {
 478                 task = tasks[i];
 479                 sem_init(&task->sleep_sem, 0, 0);
 480                 sem_init(&task->ready_for_work, 0, 0);
 481                 sem_init(&task->work_done_sem, 0, 0);
 482                 task->curr_event = 0;
 483                 err = pthread_create(&task->thread, &attr, thread_func, task);
 484                 BUG_ON(err);
 485         }
 486 }
 487
 488 static nsec_t cpu_usage;
 489 static nsec_t runavg_cpu_usage;
 490 static nsec_t parent_cpu_usage;
 491 static nsec_t runavg_parent_cpu_usage;
 492
 493 static void wait_for_tasks(void)
 494 {
 495         nsec_t cpu_usage_0, cpu_usage_1;
 496         struct task_desc *task;
 497         unsigned long i, ret;
 498
 499         start_time = get_nsecs();
 500         cpu_usage = 0;
 501         pthread_mutex_unlock(&work_done_wait_mutex);
 502
 503         for (i = 0; i < nr_tasks; i++) {
 504                 task = tasks[i];
 505                 ret = sem_wait(&task->ready_for_work);
 506                 BUG_ON(ret);
 507                 sem_init(&task->ready_for_work, 0, 0);
 508         }
 509         ret = pthread_mutex_lock(&work_done_wait_mutex);
 510         BUG_ON(ret);
 511
 512         cpu_usage_0 = get_cpu_usage_nsec_parent();
 513
 514         pthread_mutex_unlock(&start_work_mutex);
 515
 516         for (i = 0; i < nr_tasks; i++) {
 517                 task = tasks[i];
 518                 ret = sem_wait(&task->work_done_sem);
 519                 BUG_ON(ret);
 520                 sem_init(&task->work_done_sem, 0, 0);
 521                 cpu_usage += task->cpu_usage;
 522                 task->cpu_usage = 0;
 523         }
 524
 525         cpu_usage_1 = get_cpu_usage_nsec_parent();
 526         if (!runavg_cpu_usage)
 527                 runavg_cpu_usage = cpu_usage;
 528         runavg_cpu_usage = (runavg_cpu_usage*9 + cpu_usage)/10;
 529
 530         parent_cpu_usage = cpu_usage_1 - cpu_usage_0;
 531         if (!runavg_parent_cpu_usage)
 532                 runavg_parent_cpu_usage = parent_cpu_usage;
 533         runavg_parent_cpu_usage = (runavg_parent_cpu_usage*9 +
 534                                    parent_cpu_usage)/10;
 535
 536         ret = pthread_mutex_lock(&start_work_mutex);
 537         BUG_ON(ret);
 538
 539         for (i = 0; i < nr_tasks; i++) {
 540                 task = tasks[i];
 541                 sem_init(&task->sleep_sem, 0, 0);
 542                 task->curr_event = 0;
 543         }
 544 }
 545
 546 static int read_events(void);
 547
 548 static unsigned long nr_runs;
 549 static nsec_t sum_runtime;
 550 static nsec_t sum_fluct;
 551 static nsec_t run_avg;
 552
 553 static void run_one_test(void)
 554 {
 555         nsec_t T0, T1, delta, avg_delta, fluct, std_dev;
 556
 557         T0 = get_nsecs();
 558         wait_for_tasks();
 559         T1 = get_nsecs();
 560
 561         delta = T1 - T0;
 562         sum_runtime += delta;
 563         nr_runs++;
 564
 565         avg_delta = sum_runtime / nr_runs;
 566         if (delta < avg_delta)
 567                 fluct = avg_delta - delta;
 568         else
 569                 fluct = delta - avg_delta;
 570         sum_fluct += fluct;
 571         std_dev = sum_fluct / nr_runs / sqrt(nr_runs);
 572         if (!run_avg)
 573                 run_avg = delta;
 574         run_avg = (run_avg*9 + delta)/10;
 575
 576         printf("#%-3ld: %0.3f, ",
 577                 nr_runs, (double)delta/1000000.0);
 578
 579 #if 0
 580         printf("%0.2f +- %0.2f, ",
 581                 (double)avg_delta/1e6, (double)std_dev/1e6);
 582 #endif
 583         printf("ravg: %0.2f, ",
 584                 (double)run_avg/1e6);
 585
 586         printf("cpu: %0.2f / %0.2f",
 587                 (double)cpu_usage/1e6, (double)runavg_cpu_usage/1e6);
 588
 589 #if 0
 590         /*
 591          * rusage statistics done by the parent, these are less
 592          * accurate than the sum_exec_runtime based statistics:
 593          */
 594         printf(" [%0.2f / %0.2f]",
 595                 (double)parent_cpu_usage/1e6,
 596                 (double)runavg_parent_cpu_usage/1e6);
 597 #endif
 598
 599         printf("\n");
 600
 601         if (nr_sleep_corrections)
 602                 printf(" (%ld sleep corrections)\n", nr_sleep_corrections);
 603         nr_sleep_corrections = 0;
 604 }
 605
 606 static void test_calibrations(void)
 607 {
 608         nsec_t T0, T1;
 609
 610         T0 = get_nsecs();
 611         burn_nsecs(1e6);
 612         T1 = get_nsecs();
 613
 614         printf("the run test took %Ld nsecs\n", T1-T0);
 615
 616         T0 = get_nsecs();
 617         sleep_nsecs(1e6);
 618         T1 = get_nsecs();
 619
 620         printf("the sleep test took %Ld nsecs\n", T1-T0);
 621 }
 622
 623 static void __cmd_replay(void)
 624 {
 625         long nr_iterations = 10, i;
 626
 627         calibrate_run_measurement_overhead();
 628         calibrate_sleep_measurement_overhead();
 629
 630         test_calibrations();
 631
 632         read_events();
 633
 634         printf("nr_run_events:        %ld\n", nr_run_events);
 635         printf("nr_sleep_events:      %ld\n", nr_sleep_events);
 636         printf("nr_wakeup_events:     %ld\n", nr_wakeup_events);
 637
 638         if (targetless_wakeups)
 639                 printf("target-less wakeups:  %ld\n", targetless_wakeups);
 640         if (multitarget_wakeups)
 641                 printf("multi-target wakeups: %ld\n", multitarget_wakeups);
 642         if (nr_run_events_optimized)
 643                 printf("run events optimized: %ld\n",
 644                         nr_run_events_optimized);
 645
 646         print_task_traces();
 647         add_cross_task_wakeups();
 648
 649         create_tasks();
 650         printf("------------------------------------------------------------\n");
 651         for (i = 0; i < nr_iterations; i++)
 652                 run_one_test();
 653 }
 654
 655 static int
 656 process_comm_event(event_t *event, unsigned long offset, unsigned long head)
 657 {
 658         struct thread *thread;
 659
 660         thread = threads__findnew(event->comm.pid, &threads, &last_match);
 661
 662         dump_printf("%p [%p]: PERF_EVENT_COMM: %s:%d\n",
 663                 (void *)(offset + head),
 664                 (void *)(long)(event->header.size),
 665                 event->comm.comm, event->comm.pid);
 666
 667         if (thread == NULL ||
 668             thread__set_comm(thread, event->comm.comm)) {
 669                 dump_printf("problem processing PERF_EVENT_COMM, skipping event.\n");
 670                 return -1;
 671         }
 672         total_comm++;
 673
 674         return 0;
 675 }
 676
 677
 678 struct raw_event_sample {
 679         u32 size;
 680         char data[0];
 681 };
 682
 683 #define FILL_FIELD(ptr, field, event, data)     \
 684         ptr.field = (typeof(ptr.field)) raw_field_value(event, #field, data)
 685
 686 #define FILL_ARRAY(ptr, array, event, data)                     \
 687 do {                                                            \
 688         void *__array = raw_field_ptr(event, #array, data);     \
 689         memcpy(ptr.array, __array, sizeof(ptr.array));  \
 690 } while(0)
 691
 692 #define FILL_COMMON_FIELDS(ptr, event, data)                    \
 693 do {                                                            \
 694         FILL_FIELD(ptr, common_type, event, data);              \
 695         FILL_FIELD(ptr, common_flags, event, data);             \
 696         FILL_FIELD(ptr, common_preempt_count, event, data);     \
 697         FILL_FIELD(ptr, common_pid, event, data);               \
 698         FILL_FIELD(ptr, common_tgid, event, data);              \
 699 } while (0)
 700
 701
 702
 703 struct trace_switch_event {
 704         u32 size;
 705
 706         u16 common_type;
 707         u8 common_flags;
 708         u8 common_preempt_count;
 709         u32 common_pid;
 710         u32 common_tgid;
 711
 712         char prev_comm[16];
 713         u32 prev_pid;
 714         u32 prev_prio;
 715         u64 prev_state;
 716         char next_comm[16];
 717         u32 next_pid;
 718         u32 next_prio;
 719 };
 720
 721
 722 struct trace_wakeup_event {
 723         u32 size;
 724
 725         u16 common_type;
 726         u8 common_flags;
 727         u8 common_preempt_count;
 728         u32 common_pid;
 729         u32 common_tgid;
 730
 731         char comm[16];
 732         u32 pid;
 733
 734         u32 prio;
 735         u32 success;
 736         u32 cpu;
 737 };
 738
 739 struct trace_fork_event {
 740         u32 size;
 741
 742         u16 common_type;
 743         u8 common_flags;
 744         u8 common_preempt_count;
 745         u32 common_pid;
 746         u32 common_tgid;
 747
 748         char parent_comm[16];
 749         u32 parent_pid;
 750         char child_comm[16];
 751         u32 child_pid;
 752 };
 753
 754 struct trace_sched_handler {
 755         void (*switch_event)(struct trace_switch_event *,
 756                              struct event *,
 757                              int cpu,
 758                              u64 timestamp,
 759                              struct thread *thread);
 760
 761         void (*wakeup_event)(struct trace_wakeup_event *,
 762                              struct event *,
 763                              int cpu,
 764                              u64 timestamp,
 765                              struct thread *thread);
 766
 767         void (*fork_event)(struct trace_fork_event *,
 768                            struct event *,
 769                            int cpu,
 770                            u64 timestamp,
 771                            struct thread *thread);
 772 };
 773
 774
 775 static void
 776 replay_wakeup_event(struct trace_wakeup_event *wakeup_event,
 777                     struct event *event,
 778                     int cpu __used,
 779                     u64 timestamp __used,
 780                     struct thread *thread __used)
 781 {
 782         struct task_desc *waker, *wakee;
 783
 784         if (verbose) {
 785                 printf("sched_wakeup event %p\n", event);
 786
 787                 printf(" ... pid %d woke up %s/%d\n",
 788                         wakeup_event->common_pid,
 789                         wakeup_event->comm,
 790                         wakeup_event->pid);
 791         }
 792
 793         waker = register_pid(wakeup_event->common_pid, "<unknown>");
 794         wakee = register_pid(wakeup_event->pid, wakeup_event->comm);
 795
 796         add_sched_event_wakeup(waker, timestamp, wakee);
 797 }
 798
 799 static unsigned long cpu_last_switched[MAX_CPUS];
 800
 801 static void
 802 replay_switch_event(struct trace_switch_event *switch_event,
 803                     struct event *event,
 804                     int cpu,
 805                     u64 timestamp,
 806                     struct thread *thread __used)
 807 {
 808         struct task_desc *prev, *next;
 809         u64 timestamp0;
 810         s64 delta;
 811
 812         if (verbose)
 813                 printf("sched_switch event %p\n", event);
 814
 815         if (cpu >= MAX_CPUS || cpu < 0)
 816                 return;
 817
 818         timestamp0 = cpu_last_switched[cpu];
 819         if (timestamp0)
 820                 delta = timestamp - timestamp0;
 821         else
 822                 delta = 0;
 823
 824         if (delta < 0)
 825                 die("hm, delta: %Ld < 0 ?\n", delta);
 826
 827         if (verbose) {
 828                 printf(" ... switch from %s/%d to %s/%d [ran %Ld nsecs]\n",
 829                         switch_event->prev_comm, switch_event->prev_pid,
 830                         switch_event->next_comm, switch_event->next_pid,
 831                         delta);
 832         }
 833
 834         prev = register_pid(switch_event->prev_pid, switch_event->prev_comm);
 835         next = register_pid(switch_event->next_pid, switch_event->next_comm);
 836
 837         cpu_last_switched[cpu] = timestamp;
 838
 839         add_sched_event_run(prev, timestamp, delta);
 840         add_sched_event_sleep(prev, timestamp, switch_event->prev_state);
 841 }
 842
 843
 844 static void
 845 replay_fork_event(struct trace_fork_event *fork_event,
 846                   struct event *event,
 847                   int cpu __used,
 848                   u64 timestamp __used,
 849                   struct thread *thread __used)
 850 {
 851         if (verbose) {
 852                 printf("sched_fork event %p\n", event);
 853                 printf("... parent: %s/%d\n", fork_event->parent_comm, fork_event->parent_pid);
 854                 printf("...  child: %s/%d\n", fork_event->child_comm, fork_event->child_pid);
 855         }
 856         register_pid(fork_event->parent_pid, fork_event->parent_comm);
 857         register_pid(fork_event->child_pid, fork_event->child_comm);
 858 }
 859
 860 static struct trace_sched_handler replay_ops  = {
 861         .wakeup_event = replay_wakeup_event,
 862         .switch_event = replay_switch_event,
 863         .fork_event = replay_fork_event,
 864 };
 865
 866 #define TASK_STATE_TO_CHAR_STR "RSDTtZX"
 867
 868 enum thread_state {
 869         THREAD_SLEEPING,
 870         THREAD_WAKED_UP,
 871         THREAD_SCHED_IN,
 872         THREAD_IGNORE
 873 };
 874
 875 struct lat_snapshot {
 876         struct list_head        list;
 877         enum thread_state       state;
 878         u64                     wake_up_time;
 879         u64                     sched_in_time;
 880 };
 881
 882 struct thread_latency {
 883         struct list_head        snapshot_list;
 884         struct thread           *thread;
 885         struct rb_node          node;
 886 };
 887
 888 static struct rb_root lat_snapshot_root;
 889
 890 static struct thread_latency *
 891 thread_latency_search(struct rb_root *root, struct thread *thread)
 892 {
 893         struct rb_node *node = root->rb_node;
 894
 895         while (node) {
 896                 struct thread_latency *lat;
 897
 898                 lat = container_of(node, struct thread_latency, node);
 899                 if (thread->pid < lat->thread->pid)
 900                         node = node->rb_left;
 901                 else if (thread->pid > lat->thread->pid)
 902                         node = node->rb_right;
 903                 else {
 904                         return lat;
 905                 }
 906         }
 907         return NULL;
 908 }
 909
 910 static void
 911 __thread_latency_insert(struct rb_root *root, struct thread_latency *data)
 912 {
 913         struct rb_node **new = &(root->rb_node), *parent = NULL;
 914
 915         while (*new) {
 916                 struct thread_latency *this;
 917
 918                 this = container_of(*new, struct thread_latency, node);
 919                 parent = *new;
 920                 if (data->thread->pid < this->thread->pid)
 921                         new = &((*new)->rb_left);
 922                 else if (data->thread->pid > this->thread->pid)
 923                         new = &((*new)->rb_right);
 924                 else
 925                         die("Double thread insertion\n");
 926         }
 927
 928         rb_link_node(&data->node, parent, new);
 929         rb_insert_color(&data->node, root);
 930 }
 931
 932 static void thread_latency_insert(struct thread *thread)
 933 {
 934         struct thread_latency *lat;
 935         lat = calloc(sizeof(*lat), 1);
 936         if (!lat)
 937                 die("No memory");
 938
 939         lat->thread = thread;
 940         INIT_LIST_HEAD(&lat->snapshot_list);
 941         __thread_latency_insert(&lat_snapshot_root, lat);
 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 static char sched_out_state(struct trace_switch_event *switch_event)
 955 {
 956         const char *str = TASK_STATE_TO_CHAR_STR;
 957
 958         return str[switch_event->prev_state];
 959 }
 960
 961 static void
 962 lat_sched_out(struct thread_latency *lat,
 963              struct trace_switch_event *switch_event)
 964 {
 965         struct lat_snapshot *snapshot;
 966
 967         if (sched_out_state(switch_event) == 'R')
 968                 return;
 969
 970         snapshot = calloc(sizeof(*snapshot), 1);
 971         if (!snapshot)
 972                 die("Non memory");
 973
 974         list_add_tail(&snapshot->list, &lat->snapshot_list);
 975 }
 976
 977 static void
 978 lat_sched_in(struct thread_latency *lat, u64 timestamp)
 979 {
 980         struct lat_snapshot *snapshot;
 981
 982         if (list_empty(&lat->snapshot_list))
 983                 return;
 984
 985         snapshot = list_entry(lat->snapshot_list.prev, struct lat_snapshot,
 986                               list);
 987
 988         if (snapshot->state != THREAD_WAKED_UP)
 989                 return;
 990
 991         if (timestamp < snapshot->wake_up_time) {
 992                 snapshot->state = THREAD_IGNORE;
 993                 return;
 994         }
 995
 996         snapshot->state = THREAD_SCHED_IN;
 997         snapshot->sched_in_time = timestamp;
 998 }
 999
1000
1001 static void
1002 latency_switch_event(struct trace_switch_event *switch_event,
1003                      struct event *event __used,
1004                      int cpu __used,
1005                      u64 timestamp,
1006                      struct thread *thread __used)
1007 {
1008         struct thread_latency *out_lat, *in_lat;
1009         struct thread *sched_out, *sched_in;
1010
1011         sched_out = threads__findnew(switch_event->prev_pid, &threads, &last_match);
1012         sched_in = threads__findnew(switch_event->next_pid, &threads, &last_match);
1013
1014         in_lat = thread_latency_search(&lat_snapshot_root, sched_in);
1015         if (!in_lat) {
1016                 thread_latency_insert(sched_in);
1017                 in_lat = thread_latency_search(&lat_snapshot_root, sched_in);
1018                 if (!in_lat)
1019                         die("Internal latency tree error");
1020         }
1021
1022         out_lat = thread_latency_search(&lat_snapshot_root, sched_out);
1023         if (!out_lat) {
1024                 thread_latency_insert(sched_out);
1025                 out_lat = thread_latency_search(&lat_snapshot_root, sched_out);
1026                 if (!out_lat)
1027                         die("Internal latency tree error");
1028         }
1029
1030         lat_sched_in(in_lat, timestamp);
1031         lat_sched_out(out_lat, switch_event);
1032 }
1033
1034 static void
1035 latency_wakeup_event(struct trace_wakeup_event *wakeup_event,
1036                      struct event *event __used,
1037                      int cpu __used,
1038                      u64 timestamp,
1039                      struct thread *thread __used)
1040 {
1041         struct thread_latency *lat;
1042         struct lat_snapshot *snapshot;
1043         struct thread *wakee;
1044
1045         /* Note for later, it may be interesting to observe the failing cases */
1046         if (!wakeup_event->success)
1047                 return;
1048
1049         wakee = threads__findnew(wakeup_event->pid, &threads, &last_match);
1050         lat = thread_latency_search(&lat_snapshot_root, wakee);
1051         if (!lat) {
1052                 thread_latency_insert(wakee);
1053                 return;
1054         }
1055
1056         if (list_empty(&lat->snapshot_list))
1057                 return;
1058
1059         snapshot = list_entry(lat->snapshot_list.prev, struct lat_snapshot,
1060                               list);
1061
1062         if (snapshot->state != THREAD_SLEEPING)
1063                 return;
1064
1065         snapshot->state = THREAD_WAKED_UP;
1066         snapshot->wake_up_time = timestamp;
1067 }
1068
1069 static struct trace_sched_handler lat_ops  = {
1070         .wakeup_event = latency_wakeup_event,
1071         .switch_event = latency_switch_event,
1072         .fork_event = latency_fork_event,
1073 };
1074
1075 static void output_lat_thread(struct thread_latency *lat)
1076 {
1077         struct lat_snapshot *shot;
1078         int count = 0;
1079         int i;
1080         int ret;
1081         u64 max = 0, avg;
1082         u64 total = 0, delta;
1083
1084         list_for_each_entry(shot, &lat->snapshot_list, list) {
1085                 if (shot->state != THREAD_SCHED_IN)
1086                         continue;
1087
1088                 count++;
1089
1090                 delta = shot->sched_in_time - shot->wake_up_time;
1091                 if (delta > max)
1092                         max = delta;
1093                 total += delta;
1094         }
1095
1096         if (!count)
1097                 return;
1098
1099         ret = printf(" %s ", lat->thread->comm);
1100
1101         for (i = 0; i < 19 - ret; i++)
1102                 printf(" ");
1103
1104         avg = total / count;
1105
1106         printf("|%9.3f ms |%9d | avg:%9.3f ms | max:%9.3f ms |\n",
1107                 0.0, count, (double)avg/1e9, (double)max/1e9);
1108 }
1109
1110 static void __cmd_lat(void)
1111 {
1112         struct rb_node *next;
1113
1114         setup_pager();
1115         read_events();
1116
1117         printf("-----------------------------------------------------------------------------------\n");
1118         printf(" Task              |  runtime ms | switches | average delay ms | maximum delay ms |\n");
1119         printf("-----------------------------------------------------------------------------------\n");
1120
1121         next = rb_first(&lat_snapshot_root);
1122
1123         while (next) {
1124                 struct thread_latency *lat;
1125
1126                 lat = rb_entry(next, struct thread_latency, node);
1127                 output_lat_thread(lat);
1128                 next = rb_next(next);
1129         }
1130
1131         printf("-----------------------------------------------------------------------------------\n");
1132 }
1133
1134 static struct trace_sched_handler *trace_handler;
1135
1136 static void
1137 process_sched_wakeup_event(struct raw_event_sample *raw,
1138                            struct event *event,
1139                            int cpu __used,
1140                            u64 timestamp __used,
1141                            struct thread *thread __used)
1142 {
1143         struct trace_wakeup_event wakeup_event;
1144
1145         FILL_COMMON_FIELDS(wakeup_event, event, raw->data);
1146
1147         FILL_ARRAY(wakeup_event, comm, event, raw->data);
1148         FILL_FIELD(wakeup_event, pid, event, raw->data);
1149         FILL_FIELD(wakeup_event, prio, event, raw->data);
1150         FILL_FIELD(wakeup_event, success, event, raw->data);
1151         FILL_FIELD(wakeup_event, cpu, event, raw->data);
1152
1153         trace_handler->wakeup_event(&wakeup_event, event, cpu, timestamp, thread);
1154 }
1155
1156 static void
1157 process_sched_switch_event(struct raw_event_sample *raw,
1158                            struct event *event,
1159                            int cpu __used,
1160                            u64 timestamp __used,
1161                            struct thread *thread __used)
1162 {
1163         struct trace_switch_event switch_event;
1164
1165         FILL_COMMON_FIELDS(switch_event, event, raw->data);
1166
1167         FILL_ARRAY(switch_event, prev_comm, event, raw->data);
1168         FILL_FIELD(switch_event, prev_pid, event, raw->data);
1169         FILL_FIELD(switch_event, prev_prio, event, raw->data);
1170         FILL_FIELD(switch_event, prev_state, event, raw->data);
1171         FILL_ARRAY(switch_event, next_comm, event, raw->data);
1172         FILL_FIELD(switch_event, next_pid, event, raw->data);
1173         FILL_FIELD(switch_event, next_prio, event, raw->data);
1174
1175         trace_handler->switch_event(&switch_event, event, cpu, timestamp, thread);
1176 }
1177
1178 static void
1179 process_sched_fork_event(struct raw_event_sample *raw,
1180                          struct event *event,
1181                          int cpu __used,
1182                          u64 timestamp __used,
1183                          struct thread *thread __used)
1184 {
1185         struct trace_fork_event fork_event;
1186
1187         FILL_COMMON_FIELDS(fork_event, event, raw->data);
1188
1189         FILL_ARRAY(fork_event, parent_comm, event, raw->data);
1190         FILL_FIELD(fork_event, parent_pid, event, raw->data);
1191         FILL_ARRAY(fork_event, child_comm, event, raw->data);
1192         FILL_FIELD(fork_event, child_pid, event, raw->data);
1193
1194         trace_handler->fork_event(&fork_event, event, cpu, timestamp, thread);
1195 }
1196
1197 static void
1198 process_sched_exit_event(struct event *event,
1199                          int cpu __used,
1200                          u64 timestamp __used,
1201                          struct thread *thread __used)
1202 {
1203         if (verbose)
1204                 printf("sched_exit event %p\n", event);
1205 }
1206
1207 static void
1208 process_raw_event(event_t *raw_event __used, void *more_data,
1209                   int cpu, u64 timestamp, struct thread *thread)
1210 {
1211         struct raw_event_sample *raw = more_data;
1212         struct event *event;
1213         int type;
1214
1215         type = trace_parse_common_type(raw->data);
1216         event = trace_find_event(type);
1217
1218         if (!strcmp(event->name, "sched_switch"))
1219                 process_sched_switch_event(raw, event, cpu, timestamp, thread);
1220         if (!strcmp(event->name, "sched_wakeup"))
1221                 process_sched_wakeup_event(raw, event, cpu, timestamp, thread);
1222         if (!strcmp(event->name, "sched_wakeup_new"))
1223                 process_sched_wakeup_event(raw, event, cpu, timestamp, thread);
1224         if (!strcmp(event->name, "sched_process_fork"))
1225                 process_sched_fork_event(raw, event, cpu, timestamp, thread);
1226         if (!strcmp(event->name, "sched_process_exit"))
1227                 process_sched_exit_event(event, cpu, timestamp, thread);
1228 }
1229
1230 static int
1231 process_sample_event(event_t *event, unsigned long offset, unsigned long head)
1232 {
1233         char level;
1234         int show = 0;
1235         struct dso *dso = NULL;
1236         struct thread *thread;
1237         u64 ip = event->ip.ip;
1238         u64 timestamp = -1;
1239         u32 cpu = -1;
1240         u64 period = 1;
1241         void *more_data = event->ip.__more_data;
1242         int cpumode;
1243
1244         thread = threads__findnew(event->ip.pid, &threads, &last_match);
1245
1246         if (sample_type & PERF_SAMPLE_TIME) {
1247                 timestamp = *(u64 *)more_data;
1248                 more_data += sizeof(u64);
1249         }
1250
1251         if (sample_type & PERF_SAMPLE_CPU) {
1252                 cpu = *(u32 *)more_data;
1253                 more_data += sizeof(u32);
1254                 more_data += sizeof(u32); /* reserved */
1255         }
1256
1257         if (sample_type & PERF_SAMPLE_PERIOD) {
1258                 period = *(u64 *)more_data;
1259                 more_data += sizeof(u64);
1260         }
1261
1262         dump_printf("%p [%p]: PERF_EVENT_SAMPLE (IP, %d): %d/%d: %p period: %Ld\n",
1263                 (void *)(offset + head),
1264                 (void *)(long)(event->header.size),
1265                 event->header.misc,
1266                 event->ip.pid, event->ip.tid,
1267                 (void *)(long)ip,
1268                 (long long)period);
1269
1270         dump_printf(" ... thread: %s:%d\n", thread->comm, thread->pid);
1271
1272         if (thread == NULL) {
1273                 eprintf("problem processing %d event, skipping it.\n",
1274                         event->header.type);
1275                 return -1;
1276         }
1277
1278         cpumode = event->header.misc & PERF_EVENT_MISC_CPUMODE_MASK;
1279
1280         if (cpumode == PERF_EVENT_MISC_KERNEL) {
1281                 show = SHOW_KERNEL;
1282                 level = 'k';
1283
1284                 dso = kernel_dso;
1285
1286                 dump_printf(" ...... dso: %s\n", dso->name);
1287
1288         } else if (cpumode == PERF_EVENT_MISC_USER) {
1289
1290                 show = SHOW_USER;
1291                 level = '.';
1292
1293         } else {
1294                 show = SHOW_HV;
1295                 level = 'H';
1296
1297                 dso = hypervisor_dso;
1298
1299                 dump_printf(" ...... dso: [hypervisor]\n");
1300         }
1301
1302         if (sample_type & PERF_SAMPLE_RAW)
1303                 process_raw_event(event, more_data, cpu, timestamp, thread);
1304
1305         return 0;
1306 }
1307
1308 static int
1309 process_event(event_t *event, unsigned long offset, unsigned long head)
1310 {
1311         trace_event(event);
1312
1313         switch (event->header.type) {
1314         case PERF_EVENT_MMAP ... PERF_EVENT_LOST:
1315                 return 0;
1316
1317         case PERF_EVENT_COMM:
1318                 return process_comm_event(event, offset, head);
1319
1320         case PERF_EVENT_EXIT ... PERF_EVENT_READ:
1321                 return 0;
1322
1323         case PERF_EVENT_SAMPLE:
1324                 return process_sample_event(event, offset, head);
1325
1326         case PERF_EVENT_MAX:
1327         default:
1328                 return -1;
1329         }
1330
1331         return 0;
1332 }
1333
1334 static int read_events(void)
1335 {
1336         int ret, rc = EXIT_FAILURE;
1337         unsigned long offset = 0;
1338         unsigned long head = 0;
1339         struct stat perf_stat;
1340         event_t *event;
1341         uint32_t size;
1342         char *buf;
1343
1344         trace_report();
1345         register_idle_thread(&threads, &last_match);
1346
1347         input = open(input_name, O_RDONLY);
1348         if (input < 0) {
1349                 perror("failed to open file");
1350                 exit(-1);
1351         }
1352
1353         ret = fstat(input, &perf_stat);
1354         if (ret < 0) {
1355                 perror("failed to stat file");
1356                 exit(-1);
1357         }
1358
1359         if (!perf_stat.st_size) {
1360                 fprintf(stderr, "zero-sized file, nothing to do!\n");
1361                 exit(0);
1362         }
1363         header = perf_header__read(input);
1364         head = header->data_offset;
1365         sample_type = perf_header__sample_type(header);
1366
1367         if (!(sample_type & PERF_SAMPLE_RAW))
1368                 die("No trace sample to read. Did you call perf record "
1369                     "without -R?");
1370
1371         if (load_kernel() < 0) {
1372                 perror("failed to load kernel symbols");
1373                 return EXIT_FAILURE;
1374         }
1375
1376 remap:
1377         buf = (char *)mmap(NULL, page_size * mmap_window, PROT_READ,
1378                            MAP_SHARED, input, offset);
1379         if (buf == MAP_FAILED) {
1380                 perror("failed to mmap file");
1381                 exit(-1);
1382         }
1383
1384 more:
1385         event = (event_t *)(buf + head);
1386
1387         size = event->header.size;
1388         if (!size)
1389                 size = 8;
1390
1391         if (head + event->header.size >= page_size * mmap_window) {
1392                 unsigned long shift = page_size * (head / page_size);
1393                 int res;
1394
1395                 res = munmap(buf, page_size * mmap_window);
1396                 assert(res == 0);
1397
1398                 offset += shift;
1399                 head -= shift;
1400                 goto remap;
1401         }
1402
1403         size = event->header.size;
1404
1405
1406         if (!size || process_event(event, offset, head) < 0) {
1407
1408                 /*
1409                  * assume we lost track of the stream, check alignment, and
1410                  * increment a single u64 in the hope to catch on again 'soon'.
1411                  */
1412
1413                 if (unlikely(head & 7))
1414                         head &= ~7ULL;
1415
1416                 size = 8;
1417         }
1418
1419         head += size;
1420
1421         if (offset + head < (unsigned long)perf_stat.st_size)
1422                 goto more;
1423
1424         rc = EXIT_SUCCESS;
1425         close(input);
1426
1427         return rc;
1428 }
1429
1430 static const char * const sched_usage[] = {
1431         "perf sched [<options>] <command>",
1432         NULL
1433 };
1434
1435 static const struct option options[] = {
1436         OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
1437                     "dump raw trace in ASCII"),
1438         OPT_BOOLEAN('r', "replay", &replay_mode,
1439                     "replay sched behaviour from traces"),
1440         OPT_BOOLEAN('l', "latency", &lat_mode,
1441                     "measure various latencies"),
1442         OPT_BOOLEAN('v', "verbose", &verbose,
1443                     "be more verbose (show symbol address, etc)"),
1444         OPT_END()
1445 };
1446
1447 int cmd_sched(int argc, const char **argv, const char *prefix __used)
1448 {
1449         symbol__init();
1450         page_size = getpagesize();
1451
1452         argc = parse_options(argc, argv, options, sched_usage, 0);
1453         if (argc) {
1454                 /*
1455                  * Special case: if there's an argument left then assume tha
1456                  * it's a symbol filter:
1457                  */
1458                 if (argc > 1)
1459                         usage_with_options(sched_usage, options);
1460         }
1461
1462         if (replay_mode)
1463                 trace_handler = &replay_ops;
1464         else if (lat_mode)
1465                 trace_handler = &lat_ops;
1466         else
1467                 usage_with_options(sched_usage, options);
1468
1469         if (replay_mode)
1470                 __cmd_replay();
1471         else if (lat_mode)
1472                 __cmd_lat();
1473
1474         return 0;
1475 }