tools/perf/builtin-sched.c

   1 #include "builtin.h"
   2 #include "perf.h"
   3
   4 #include "util/util.h"
   5 #include "util/evlist.h"
   6 #include "util/cache.h"
   7 #include "util/evsel.h"
   8 #include "util/symbol.h"
   9 #include "util/thread.h"
  10 #include "util/header.h"
  11 #include "util/session.h"
  12 #include "util/tool.h"
  13 #include "util/cloexec.h"
  14
  15 #include "util/parse-options.h"
  16 #include "util/trace-event.h"
  17
  18 #include "util/debug.h"
  19
  20 #include <sys/prctl.h>
  21 #include <sys/resource.h>
  22
  23 #include <semaphore.h>
  24 #include <pthread.h>
  25 #include <math.h>
  26
  27 #define PR_SET_NAME             15               /* Set process name */
  28 #define MAX_CPUS                4096
  29 #define COMM_LEN                20
  30 #define SYM_LEN                 129
  31 #define MAX_PID                 65536
  32
  33 struct sched_atom;
  34
  35 struct task_desc {
  36         unsigned long           nr;
  37         unsigned long           pid;
  38         char                    comm[COMM_LEN];
  39
  40         unsigned long           nr_events;
  41         unsigned long           curr_event;
  42         struct sched_atom       **atoms;
  43
  44         pthread_t               thread;
  45         sem_t                   sleep_sem;
  46
  47         sem_t                   ready_for_work;
  48         sem_t                   work_done_sem;
  49
  50         u64                     cpu_usage;
  51 };
  52
  53 enum sched_event_type {
  54         SCHED_EVENT_RUN,
  55         SCHED_EVENT_SLEEP,
  56         SCHED_EVENT_WAKEUP,
  57         SCHED_EVENT_MIGRATION,
  58 };
  59
  60 struct sched_atom {
  61         enum sched_event_type   type;
  62         int                     specific_wait;
  63         u64                     timestamp;
  64         u64                     duration;
  65         unsigned long           nr;
  66         sem_t                   *wait_sem;
  67         struct task_desc        *wakee;
  68 };
  69
  70 #define TASK_STATE_TO_CHAR_STR "RSDTtZXxKWP"
  71
  72 enum thread_state {
  73         THREAD_SLEEPING = 0,
  74         THREAD_WAIT_CPU,
  75         THREAD_SCHED_IN,
  76         THREAD_IGNORE
  77 };
  78
  79 struct work_atom {
  80         struct list_head        list;
  81         enum thread_state       state;
  82         u64                     sched_out_time;
  83         u64                     wake_up_time;
  84         u64                     sched_in_time;
  85         u64                     runtime;
  86 };
  87
  88 struct work_atoms {
  89         struct list_head        work_list;
  90         struct thread           *thread;
  91         struct rb_node          node;
  92         u64                     max_lat;
  93         u64                     max_lat_at;
  94         u64                     total_lat;
  95         u64                     nb_atoms;
  96         u64                     total_runtime;
  97 };
  98
  99 typedef int (*sort_fn_t)(struct work_atoms *, struct work_atoms *);
 100
 101 struct perf_sched;
 102
 103 struct trace_sched_handler {
 104         int (*switch_event)(struct perf_sched *sched, struct perf_evsel *evsel,
 105                             struct perf_sample *sample, struct machine *machine);
 106
 107         int (*runtime_event)(struct perf_sched *sched, struct perf_evsel *evsel,
 108                              struct perf_sample *sample, struct machine *machine);
 109
 110         int (*wakeup_event)(struct perf_sched *sched, struct perf_evsel *evsel,
 111                             struct perf_sample *sample, struct machine *machine);
 112
 113         /* PERF_RECORD_FORK event, not sched_process_fork tracepoint */
 114         int (*fork_event)(struct perf_sched *sched, union perf_event *event,
 115                           struct machine *machine);
 116
 117         int (*migrate_task_event)(struct perf_sched *sched,
 118                                   struct perf_evsel *evsel,
 119                                   struct perf_sample *sample,
 120                                   struct machine *machine);
 121 };
 122
 123 struct perf_sched {
 124         struct perf_tool tool;
 125         const char       *sort_order;
 126         unsigned long    nr_tasks;
 127         struct task_desc *pid_to_task[MAX_PID];
 128         struct task_desc **tasks;
 129         const struct trace_sched_handler *tp_handler;
 130         pthread_mutex_t  start_work_mutex;
 131         pthread_mutex_t  work_done_wait_mutex;
 132         int              profile_cpu;
 133 /*
 134  * Track the current task - that way we can know whether there's any
 135  * weird events, such as a task being switched away that is not current.
 136  */
 137         int              max_cpu;
 138         u32              curr_pid[MAX_CPUS];
 139         struct thread    *curr_thread[MAX_CPUS];
 140         char             next_shortname1;
 141         char             next_shortname2;
 142         unsigned int     replay_repeat;
 143         unsigned long    nr_run_events;
 144         unsigned long    nr_sleep_events;
 145         unsigned long    nr_wakeup_events;
 146         unsigned long    nr_sleep_corrections;
 147         unsigned long    nr_run_events_optimized;
 148         unsigned long    targetless_wakeups;
 149         unsigned long    multitarget_wakeups;
 150         unsigned long    nr_runs;
 151         unsigned long    nr_timestamps;
 152         unsigned long    nr_unordered_timestamps;
 153         unsigned long    nr_context_switch_bugs;
 154         unsigned long    nr_events;
 155         unsigned long    nr_lost_chunks;
 156         unsigned long    nr_lost_events;
 157         u64              run_measurement_overhead;
 158         u64              sleep_measurement_overhead;
 159         u64              start_time;
 160         u64              cpu_usage;
 161         u64              runavg_cpu_usage;
 162         u64              parent_cpu_usage;
 163         u64              runavg_parent_cpu_usage;
 164         u64              sum_runtime;
 165         u64              sum_fluct;
 166         u64              run_avg;
 167         u64              all_runtime;
 168         u64              all_count;
 169         u64              cpu_last_switched[MAX_CPUS];
 170         struct rb_root   atom_root, sorted_atom_root;
 171         struct list_head sort_list, cmp_pid;
 172 };
 173
 174 static u64 get_nsecs(void)
 175 {
 176         struct timespec ts;
 177
 178         clock_gettime(CLOCK_MONOTONIC, &ts);
 179
 180         return ts.tv_sec * 1000000000ULL + ts.tv_nsec;
 181 }
 182
 183 static void burn_nsecs(struct perf_sched *sched, u64 nsecs)
 184 {
 185         u64 T0 = get_nsecs(), T1;
 186
 187         do {
 188                 T1 = get_nsecs();
 189         } while (T1 + sched->run_measurement_overhead < T0 + nsecs);
 190 }
 191
 192 static void sleep_nsecs(u64 nsecs)
 193 {
 194         struct timespec ts;
 195
 196         ts.tv_nsec = nsecs % 999999999;
 197         ts.tv_sec = nsecs / 999999999;
 198
 199         nanosleep(&ts, NULL);
 200 }
 201
 202 static void calibrate_run_measurement_overhead(struct perf_sched *sched)
 203 {
 204         u64 T0, T1, delta, min_delta = 1000000000ULL;
 205         int i;
 206
 207         for (i = 0; i < 10; i++) {
 208                 T0 = get_nsecs();
 209                 burn_nsecs(sched, 0);
 210                 T1 = get_nsecs();
 211                 delta = T1-T0;
 212                 min_delta = min(min_delta, delta);
 213         }
 214         sched->run_measurement_overhead = min_delta;
 215
 216         printf("run measurement overhead: %" PRIu64 " nsecs\n", min_delta);
 217 }
 218
 219 static void calibrate_sleep_measurement_overhead(struct perf_sched *sched)
 220 {
 221         u64 T0, T1, delta, min_delta = 1000000000ULL;
 222         int i;
 223
 224         for (i = 0; i < 10; i++) {
 225                 T0 = get_nsecs();
 226                 sleep_nsecs(10000);
 227                 T1 = get_nsecs();
 228                 delta = T1-T0;
 229                 min_delta = min(min_delta, delta);
 230         }
 231         min_delta -= 10000;
 232         sched->sleep_measurement_overhead = min_delta;
 233
 234         printf("sleep measurement overhead: %" PRIu64 " nsecs\n", min_delta);
 235 }
 236
 237 static struct sched_atom *
 238 get_new_event(struct task_desc *task, u64 timestamp)
 239 {
 240         struct sched_atom *event = zalloc(sizeof(*event));
 241         unsigned long idx = task->nr_events;
 242         size_t size;
 243
 244         event->timestamp = timestamp;
 245         event->nr = idx;
 246
 247         task->nr_events++;
 248         size = sizeof(struct sched_atom *) * task->nr_events;
 249         task->atoms = realloc(task->atoms, size);
 250         BUG_ON(!task->atoms);
 251
 252         task->atoms[idx] = event;
 253
 254         return event;
 255 }
 256
 257 static struct sched_atom *last_event(struct task_desc *task)
 258 {
 259         if (!task->nr_events)
 260                 return NULL;
 261
 262         return task->atoms[task->nr_events - 1];
 263 }
 264
 265 static void add_sched_event_run(struct perf_sched *sched, struct task_desc *task,
 266                                 u64 timestamp, u64 duration)
 267 {
 268         struct sched_atom *event, *curr_event = last_event(task);
 269
 270         /*
 271          * optimize an existing RUN event by merging this one
 272          * to it:
 273          */
 274         if (curr_event && curr_event->type == SCHED_EVENT_RUN) {
 275                 sched->nr_run_events_optimized++;
 276                 curr_event->duration += duration;
 277                 return;
 278         }
 279
 280         event = get_new_event(task, timestamp);
 281
 282         event->type = SCHED_EVENT_RUN;
 283         event->duration = duration;
 284
 285         sched->nr_run_events++;
 286 }
 287
 288 static void add_sched_event_wakeup(struct perf_sched *sched, struct task_desc *task,
 289                                    u64 timestamp, struct task_desc *wakee)
 290 {
 291         struct sched_atom *event, *wakee_event;
 292
 293         event = get_new_event(task, timestamp);
 294         event->type = SCHED_EVENT_WAKEUP;
 295         event->wakee = wakee;
 296
 297         wakee_event = last_event(wakee);
 298         if (!wakee_event || wakee_event->type != SCHED_EVENT_SLEEP) {
 299                 sched->targetless_wakeups++;
 300                 return;
 301         }
 302         if (wakee_event->wait_sem) {
 303                 sched->multitarget_wakeups++;
 304                 return;
 305         }
 306
 307         wakee_event->wait_sem = zalloc(sizeof(*wakee_event->wait_sem));
 308         sem_init(wakee_event->wait_sem, 0, 0);
 309         wakee_event->specific_wait = 1;
 310         event->wait_sem = wakee_event->wait_sem;
 311
 312         sched->nr_wakeup_events++;
 313 }
 314
 315 static void add_sched_event_sleep(struct perf_sched *sched, struct task_desc *task,
 316                                   u64 timestamp, u64 task_state __maybe_unused)
 317 {
 318         struct sched_atom *event = get_new_event(task, timestamp);
 319
 320         event->type = SCHED_EVENT_SLEEP;
 321
 322         sched->nr_sleep_events++;
 323 }
 324
 325 static struct task_desc *register_pid(struct perf_sched *sched,
 326                                       unsigned long pid, const char *comm)
 327 {
 328         struct task_desc *task;
 329
 330         BUG_ON(pid >= MAX_PID);
 331
 332         task = sched->pid_to_task[pid];
 333
 334         if (task)
 335                 return task;
 336
 337         task = zalloc(sizeof(*task));
 338         task->pid = pid;
 339         task->nr = sched->nr_tasks;
 340         strcpy(task->comm, comm);
 341         /*
 342          * every task starts in sleeping state - this gets ignored
 343          * if there's no wakeup pointing to this sleep state:
 344          */
 345         add_sched_event_sleep(sched, task, 0, 0);
 346
 347         sched->pid_to_task[pid] = task;
 348         sched->nr_tasks++;
 349         sched->tasks = realloc(sched->tasks, sched->nr_tasks * sizeof(struct task_task *));
 350         BUG_ON(!sched->tasks);
 351         sched->tasks[task->nr] = task;
 352
 353         if (verbose)
 354                 printf("registered task #%ld, PID %ld (%s)\n", sched->nr_tasks, pid, comm);
 355
 356         return task;
 357 }
 358
 359
 360 static void print_task_traces(struct perf_sched *sched)
 361 {
 362         struct task_desc *task;
 363         unsigned long i;
 364
 365         for (i = 0; i < sched->nr_tasks; i++) {
 366                 task = sched->tasks[i];
 367                 printf("task %6ld (%20s:%10ld), nr_events: %ld\n",
 368                         task->nr, task->comm, task->pid, task->nr_events);
 369         }
 370 }
 371
 372 static void add_cross_task_wakeups(struct perf_sched *sched)
 373 {
 374         struct task_desc *task1, *task2;
 375         unsigned long i, j;
 376
 377         for (i = 0; i < sched->nr_tasks; i++) {
 378                 task1 = sched->tasks[i];
 379                 j = i + 1;
 380                 if (j == sched->nr_tasks)
 381                         j = 0;
 382                 task2 = sched->tasks[j];
 383                 add_sched_event_wakeup(sched, task1, 0, task2);
 384         }
 385 }
 386
 387 static void perf_sched__process_event(struct perf_sched *sched,
 388                                       struct sched_atom *atom)
 389 {
 390         int ret = 0;
 391
 392         switch (atom->type) {
 393                 case SCHED_EVENT_RUN:
 394                         burn_nsecs(sched, atom->duration);
 395                         break;
 396                 case SCHED_EVENT_SLEEP:
 397                         if (atom->wait_sem)
 398                                 ret = sem_wait(atom->wait_sem);
 399                         BUG_ON(ret);
 400                         break;
 401                 case SCHED_EVENT_WAKEUP:
 402                         if (atom->wait_sem)
 403                                 ret = sem_post(atom->wait_sem);
 404                         BUG_ON(ret);
 405                         break;
 406                 case SCHED_EVENT_MIGRATION:
 407                         break;
 408                 default:
 409                         BUG_ON(1);
 410         }
 411 }
 412
 413 static u64 get_cpu_usage_nsec_parent(void)
 414 {
 415         struct rusage ru;
 416         u64 sum;
 417         int err;
 418
 419         err = getrusage(RUSAGE_SELF, &ru);
 420         BUG_ON(err);
 421
 422         sum =  ru.ru_utime.tv_sec*1e9 + ru.ru_utime.tv_usec*1e3;
 423         sum += ru.ru_stime.tv_sec*1e9 + ru.ru_stime.tv_usec*1e3;
 424
 425         return sum;
 426 }
 427
 428 static int self_open_counters(void)
 429 {
 430         struct perf_event_attr attr;
 431         int fd;
 432
 433         memset(&attr, 0, sizeof(attr));
 434
 435         attr.type = PERF_TYPE_SOFTWARE;
 436         attr.config = PERF_COUNT_SW_TASK_CLOCK;
 437
 438         fd = sys_perf_event_open(&attr, 0, -1, -1,
 439                                  perf_event_open_cloexec_flag());
 440
 441         if (fd < 0)
 442                 pr_err("Error: sys_perf_event_open() syscall returned "
 443                        "with %d (%s)\n", fd, strerror(errno));
 444         return fd;
 445 }
 446
 447 static u64 get_cpu_usage_nsec_self(int fd)
 448 {
 449         u64 runtime;
 450         int ret;
 451
 452         ret = read(fd, &runtime, sizeof(runtime));
 453         BUG_ON(ret != sizeof(runtime));
 454
 455         return runtime;
 456 }
 457
 458 struct sched_thread_parms {
 459         struct task_desc  *task;
 460         struct perf_sched *sched;
 461 };
 462
 463 static void *thread_func(void *ctx)
 464 {
 465         struct sched_thread_parms *parms = ctx;
 466         struct task_desc *this_task = parms->task;
 467         struct perf_sched *sched = parms->sched;
 468         u64 cpu_usage_0, cpu_usage_1;
 469         unsigned long i, ret;
 470         char comm2[22];
 471         int fd;
 472
 473         zfree(&parms);
 474
 475         sprintf(comm2, ":%s", this_task->comm);
 476         prctl(PR_SET_NAME, comm2);
 477         fd = self_open_counters();
 478         if (fd < 0)
 479                 return NULL;
 480 again:
 481         ret = sem_post(&this_task->ready_for_work);
 482         BUG_ON(ret);
 483         ret = pthread_mutex_lock(&sched->start_work_mutex);
 484         BUG_ON(ret);
 485         ret = pthread_mutex_unlock(&sched->start_work_mutex);
 486         BUG_ON(ret);
 487
 488         cpu_usage_0 = get_cpu_usage_nsec_self(fd);
 489
 490         for (i = 0; i < this_task->nr_events; i++) {
 491                 this_task->curr_event = i;
 492                 perf_sched__process_event(sched, this_task->atoms[i]);
 493         }
 494
 495         cpu_usage_1 = get_cpu_usage_nsec_self(fd);
 496         this_task->cpu_usage = cpu_usage_1 - cpu_usage_0;
 497         ret = sem_post(&this_task->work_done_sem);
 498         BUG_ON(ret);
 499
 500         ret = pthread_mutex_lock(&sched->work_done_wait_mutex);
 501         BUG_ON(ret);
 502         ret = pthread_mutex_unlock(&sched->work_done_wait_mutex);
 503         BUG_ON(ret);
 504
 505         goto again;
 506 }
 507
 508 static void create_tasks(struct perf_sched *sched)
 509 {
 510         struct task_desc *task;
 511         pthread_attr_t attr;
 512         unsigned long i;
 513         int err;
 514
 515         err = pthread_attr_init(&attr);
 516         BUG_ON(err);
 517         err = pthread_attr_setstacksize(&attr,
 518                         (size_t) max(16 * 1024, PTHREAD_STACK_MIN));
 519         BUG_ON(err);
 520         err = pthread_mutex_lock(&sched->start_work_mutex);
 521         BUG_ON(err);
 522         err = pthread_mutex_lock(&sched->work_done_wait_mutex);
 523         BUG_ON(err);
 524         for (i = 0; i < sched->nr_tasks; i++) {
 525                 struct sched_thread_parms *parms = malloc(sizeof(*parms));
 526                 BUG_ON(parms == NULL);
 527                 parms->task = task = sched->tasks[i];
 528                 parms->sched = sched;
 529                 sem_init(&task->sleep_sem, 0, 0);
 530                 sem_init(&task->ready_for_work, 0, 0);
 531                 sem_init(&task->work_done_sem, 0, 0);
 532                 task->curr_event = 0;
 533                 err = pthread_create(&task->thread, &attr, thread_func, parms);
 534                 BUG_ON(err);
 535         }
 536 }
 537
 538 static void wait_for_tasks(struct perf_sched *sched)
 539 {
 540         u64 cpu_usage_0, cpu_usage_1;
 541         struct task_desc *task;
 542         unsigned long i, ret;
 543
 544         sched->start_time = get_nsecs();
 545         sched->cpu_usage = 0;
 546         pthread_mutex_unlock(&sched->work_done_wait_mutex);
 547
 548         for (i = 0; i < sched->nr_tasks; i++) {
 549                 task = sched->tasks[i];
 550                 ret = sem_wait(&task->ready_for_work);
 551                 BUG_ON(ret);
 552                 sem_init(&task->ready_for_work, 0, 0);
 553         }
 554         ret = pthread_mutex_lock(&sched->work_done_wait_mutex);
 555         BUG_ON(ret);
 556
 557         cpu_usage_0 = get_cpu_usage_nsec_parent();
 558
 559         pthread_mutex_unlock(&sched->start_work_mutex);
 560
 561         for (i = 0; i < sched->nr_tasks; i++) {
 562                 task = sched->tasks[i];
 563                 ret = sem_wait(&task->work_done_sem);
 564                 BUG_ON(ret);
 565                 sem_init(&task->work_done_sem, 0, 0);
 566                 sched->cpu_usage += task->cpu_usage;
 567                 task->cpu_usage = 0;
 568         }
 569
 570         cpu_usage_1 = get_cpu_usage_nsec_parent();
 571         if (!sched->runavg_cpu_usage)
 572                 sched->runavg_cpu_usage = sched->cpu_usage;
 573         sched->runavg_cpu_usage = (sched->runavg_cpu_usage * 9 + sched->cpu_usage) / 10;
 574
 575         sched->parent_cpu_usage = cpu_usage_1 - cpu_usage_0;
 576         if (!sched->runavg_parent_cpu_usage)
 577                 sched->runavg_parent_cpu_usage = sched->parent_cpu_usage;
 578         sched->runavg_parent_cpu_usage = (sched->runavg_parent_cpu_usage * 9 +
 579                                          sched->parent_cpu_usage)/10;
 580
 581         ret = pthread_mutex_lock(&sched->start_work_mutex);
 582         BUG_ON(ret);
 583
 584         for (i = 0; i < sched->nr_tasks; i++) {
 585                 task = sched->tasks[i];
 586                 sem_init(&task->sleep_sem, 0, 0);
 587                 task->curr_event = 0;
 588         }
 589 }
 590
 591 static void run_one_test(struct perf_sched *sched)
 592 {
 593         u64 T0, T1, delta, avg_delta, fluct;
 594
 595         T0 = get_nsecs();
 596         wait_for_tasks(sched);
 597         T1 = get_nsecs();
 598
 599         delta = T1 - T0;
 600         sched->sum_runtime += delta;
 601         sched->nr_runs++;
 602
 603         avg_delta = sched->sum_runtime / sched->nr_runs;
 604         if (delta < avg_delta)
 605                 fluct = avg_delta - delta;
 606         else
 607                 fluct = delta - avg_delta;
 608         sched->sum_fluct += fluct;
 609         if (!sched->run_avg)
 610                 sched->run_avg = delta;
 611         sched->run_avg = (sched->run_avg * 9 + delta) / 10;
 612
 613         printf("#%-3ld: %0.3f, ", sched->nr_runs, (double)delta / 1000000.0);
 614
 615         printf("ravg: %0.2f, ", (double)sched->run_avg / 1e6);
 616
 617         printf("cpu: %0.2f / %0.2f",
 618                 (double)sched->cpu_usage / 1e6, (double)sched->runavg_cpu_usage / 1e6);
 619
 620 #if 0
 621         /*
 622          * rusage statistics done by the parent, these are less
 623          * accurate than the sched->sum_exec_runtime based statistics:
 624          */
 625         printf(" [%0.2f / %0.2f]",
 626                 (double)sched->parent_cpu_usage/1e6,
 627                 (double)sched->runavg_parent_cpu_usage/1e6);
 628 #endif
 629
 630         printf("\n");
 631
 632         if (sched->nr_sleep_corrections)
 633                 printf(" (%ld sleep corrections)\n", sched->nr_sleep_corrections);
 634         sched->nr_sleep_corrections = 0;
 635 }
 636
 637 static void test_calibrations(struct perf_sched *sched)
 638 {
 639         u64 T0, T1;
 640
 641         T0 = get_nsecs();
 642         burn_nsecs(sched, 1e6);
 643         T1 = get_nsecs();
 644
 645         printf("the run test took %" PRIu64 " nsecs\n", T1 - T0);
 646
 647         T0 = get_nsecs();
 648         sleep_nsecs(1e6);
 649         T1 = get_nsecs();
 650
 651         printf("the sleep test took %" PRIu64 " nsecs\n", T1 - T0);
 652 }
 653
 654 static int
 655 replay_wakeup_event(struct perf_sched *sched,
 656                     struct perf_evsel *evsel, struct perf_sample *sample,
 657                     struct machine *machine __maybe_unused)
 658 {
 659         const char *comm = perf_evsel__strval(evsel, sample, "comm");
 660         const u32 pid    = perf_evsel__intval(evsel, sample, "pid");
 661         struct task_desc *waker, *wakee;
 662
 663         if (verbose) {
 664                 printf("sched_wakeup event %p\n", evsel);
 665
 666                 printf(" ... pid %d woke up %s/%d\n", sample->tid, comm, pid);
 667         }
 668
 669         waker = register_pid(sched, sample->tid, "<unknown>");
 670         wakee = register_pid(sched, pid, comm);
 671
 672         add_sched_event_wakeup(sched, waker, sample->time, wakee);
 673         return 0;
 674 }
 675
 676 static int replay_switch_event(struct perf_sched *sched,
 677                                struct perf_evsel *evsel,
 678                                struct perf_sample *sample,
 679                                struct machine *machine __maybe_unused)
 680 {
 681         const char *prev_comm  = perf_evsel__strval(evsel, sample, "prev_comm"),
 682                    *next_comm  = perf_evsel__strval(evsel, sample, "next_comm");
 683         const u32 prev_pid = perf_evsel__intval(evsel, sample, "prev_pid"),
 684                   next_pid = perf_evsel__intval(evsel, sample, "next_pid");
 685         const u64 prev_state = perf_evsel__intval(evsel, sample, "prev_state");
 686         struct task_desc *prev, __maybe_unused *next;
 687         u64 timestamp0, timestamp = sample->time;
 688         int cpu = sample->cpu;
 689         s64 delta;
 690
 691         if (verbose)
 692                 printf("sched_switch event %p\n", evsel);
 693
 694         if (cpu >= MAX_CPUS || cpu < 0)
 695                 return 0;
 696
 697         timestamp0 = sched->cpu_last_switched[cpu];
 698         if (timestamp0)
 699                 delta = timestamp - timestamp0;
 700         else
 701                 delta = 0;
 702
 703         if (delta < 0) {
 704                 pr_err("hm, delta: %" PRIu64 " < 0 ?\n", delta);
 705                 return -1;
 706         }
 707
 708         pr_debug(" ... switch from %s/%d to %s/%d [ran %" PRIu64 " nsecs]\n",
 709                  prev_comm, prev_pid, next_comm, next_pid, delta);
 710
 711         prev = register_pid(sched, prev_pid, prev_comm);
 712         next = register_pid(sched, next_pid, next_comm);
 713
 714         sched->cpu_last_switched[cpu] = timestamp;
 715
 716         add_sched_event_run(sched, prev, timestamp, delta);
 717         add_sched_event_sleep(sched, prev, timestamp, prev_state);
 718
 719         return 0;
 720 }
 721
 722 static int replay_fork_event(struct perf_sched *sched,
 723                              union perf_event *event,
 724                              struct machine *machine)
 725 {
 726         struct thread *child, *parent;
 727
 728         child = machine__findnew_thread(machine, event->fork.pid,
 729                                         event->fork.tid);
 730         parent = machine__findnew_thread(machine, event->fork.ppid,
 731                                          event->fork.ptid);
 732
 733         if (child == NULL || parent == NULL) {
 734                 pr_debug("thread does not exist on fork event: child %p, parent %p\n",
 735                                  child, parent);
 736                 return 0;
 737         }
 738
 739         if (verbose) {
 740                 printf("fork event\n");
 741                 printf("... parent: %s/%d\n", thread__comm_str(parent), parent->tid);
 742                 printf("...  child: %s/%d\n", thread__comm_str(child), child->tid);
 743         }
 744
 745         register_pid(sched, parent->tid, thread__comm_str(parent));
 746         register_pid(sched, child->tid, thread__comm_str(child));
 747         return 0;
 748 }
 749
 750 struct sort_dimension {
 751         const char              *name;
 752         sort_fn_t               cmp;
 753         struct list_head        list;
 754 };
 755
 756 static int
 757 thread_lat_cmp(struct list_head *list, struct work_atoms *l, struct work_atoms *r)
 758 {
 759         struct sort_dimension *sort;
 760         int ret = 0;
 761
 762         BUG_ON(list_empty(list));
 763
 764         list_for_each_entry(sort, list, list) {
 765                 ret = sort->cmp(l, r);
 766                 if (ret)
 767                         return ret;
 768         }
 769
 770         return ret;
 771 }
 772
 773 static struct work_atoms *
 774 thread_atoms_search(struct rb_root *root, struct thread *thread,
 775                          struct list_head *sort_list)
 776 {
 777         struct rb_node *node = root->rb_node;
 778         struct work_atoms key = { .thread = thread };
 779
 780         while (node) {
 781                 struct work_atoms *atoms;
 782                 int cmp;
 783
 784                 atoms = container_of(node, struct work_atoms, node);
 785
 786                 cmp = thread_lat_cmp(sort_list, &key, atoms);
 787                 if (cmp > 0)
 788                         node = node->rb_left;
 789                 else if (cmp < 0)
 790                         node = node->rb_right;
 791                 else {
 792                         BUG_ON(thread != atoms->thread);
 793                         return atoms;
 794                 }
 795         }
 796         return NULL;
 797 }
 798
 799 static void
 800 __thread_latency_insert(struct rb_root *root, struct work_atoms *data,
 801                          struct list_head *sort_list)
 802 {
 803         struct rb_node **new = &(root->rb_node), *parent = NULL;
 804
 805         while (*new) {
 806                 struct work_atoms *this;
 807                 int cmp;
 808
 809                 this = container_of(*new, struct work_atoms, node);
 810                 parent = *new;
 811
 812                 cmp = thread_lat_cmp(sort_list, data, this);
 813
 814                 if (cmp > 0)
 815                         new = &((*new)->rb_left);
 816                 else
 817                         new = &((*new)->rb_right);
 818         }
 819
 820         rb_link_node(&data->node, parent, new);
 821         rb_insert_color(&data->node, root);
 822 }
 823
 824 static int thread_atoms_insert(struct perf_sched *sched, struct thread *thread)
 825 {
 826         struct work_atoms *atoms = zalloc(sizeof(*atoms));
 827         if (!atoms) {
 828                 pr_err("No memory at %s\n", __func__);
 829                 return -1;
 830         }
 831
 832         atoms->thread = thread;
 833         INIT_LIST_HEAD(&atoms->work_list);
 834         __thread_latency_insert(&sched->atom_root, atoms, &sched->cmp_pid);
 835         return 0;
 836 }
 837
 838 static char sched_out_state(u64 prev_state)
 839 {
 840         const char *str = TASK_STATE_TO_CHAR_STR;
 841
 842         return str[prev_state];
 843 }
 844
 845 static int
 846 add_sched_out_event(struct work_atoms *atoms,
 847                     char run_state,
 848                     u64 timestamp)
 849 {
 850         struct work_atom *atom = zalloc(sizeof(*atom));
 851         if (!atom) {
 852                 pr_err("Non memory at %s", __func__);
 853                 return -1;
 854         }
 855
 856         atom->sched_out_time = timestamp;
 857
 858         if (run_state == 'R') {
 859                 atom->state = THREAD_WAIT_CPU;
 860                 atom->wake_up_time = atom->sched_out_time;
 861         }
 862
 863         list_add_tail(&atom->list, &atoms->work_list);
 864         return 0;
 865 }
 866
 867 static void
 868 add_runtime_event(struct work_atoms *atoms, u64 delta,
 869                   u64 timestamp __maybe_unused)
 870 {
 871         struct work_atom *atom;
 872
 873         BUG_ON(list_empty(&atoms->work_list));
 874
 875         atom = list_entry(atoms->work_list.prev, struct work_atom, list);
 876
 877         atom->runtime += delta;
 878         atoms->total_runtime += delta;
 879 }
 880
 881 static void
 882 add_sched_in_event(struct work_atoms *atoms, u64 timestamp)
 883 {
 884         struct work_atom *atom;
 885         u64 delta;
 886
 887         if (list_empty(&atoms->work_list))
 888                 return;
 889
 890         atom = list_entry(atoms->work_list.prev, struct work_atom, list);
 891
 892         if (atom->state != THREAD_WAIT_CPU)
 893                 return;
 894
 895         if (timestamp < atom->wake_up_time) {
 896                 atom->state = THREAD_IGNORE;
 897                 return;
 898         }
 899
 900         atom->state = THREAD_SCHED_IN;
 901         atom->sched_in_time = timestamp;
 902
 903         delta = atom->sched_in_time - atom->wake_up_time;
 904         atoms->total_lat += delta;
 905         if (delta > atoms->max_lat) {
 906                 atoms->max_lat = delta;
 907                 atoms->max_lat_at = timestamp;
 908         }
 909         atoms->nb_atoms++;
 910 }
 911
 912 static int latency_switch_event(struct perf_sched *sched,
 913                                 struct perf_evsel *evsel,
 914                                 struct perf_sample *sample,
 915                                 struct machine *machine)
 916 {
 917         const u32 prev_pid = perf_evsel__intval(evsel, sample, "prev_pid"),
 918                   next_pid = perf_evsel__intval(evsel, sample, "next_pid");
 919         const u64 prev_state = perf_evsel__intval(evsel, sample, "prev_state");
 920         struct work_atoms *out_events, *in_events;
 921         struct thread *sched_out, *sched_in;
 922         u64 timestamp0, timestamp = sample->time;
 923         int cpu = sample->cpu;
 924         s64 delta;
 925
 926         BUG_ON(cpu >= MAX_CPUS || cpu < 0);
 927
 928         timestamp0 = sched->cpu_last_switched[cpu];
 929         sched->cpu_last_switched[cpu] = timestamp;
 930         if (timestamp0)
 931                 delta = timestamp - timestamp0;
 932         else
 933                 delta = 0;
 934
 935         if (delta < 0) {
 936                 pr_err("hm, delta: %" PRIu64 " < 0 ?\n", delta);
 937                 return -1;
 938         }
 939
 940         sched_out = machine__findnew_thread(machine, -1, prev_pid);
 941         sched_in = machine__findnew_thread(machine, -1, next_pid);
 942
 943         out_events = thread_atoms_search(&sched->atom_root, sched_out, &sched->cmp_pid);
 944         if (!out_events) {
 945                 if (thread_atoms_insert(sched, sched_out))
 946                         return -1;
 947                 out_events = thread_atoms_search(&sched->atom_root, sched_out, &sched->cmp_pid);
 948                 if (!out_events) {
 949                         pr_err("out-event: Internal tree error");
 950                         return -1;
 951                 }
 952         }
 953         if (add_sched_out_event(out_events, sched_out_state(prev_state), timestamp))
 954                 return -1;
 955
 956         in_events = thread_atoms_search(&sched->atom_root, sched_in, &sched->cmp_pid);
 957         if (!in_events) {
 958                 if (thread_atoms_insert(sched, sched_in))
 959                         return -1;
 960                 in_events = thread_atoms_search(&sched->atom_root, sched_in, &sched->cmp_pid);
 961                 if (!in_events) {
 962                         pr_err("in-event: Internal tree error");
 963                         return -1;
 964                 }
 965                 /*
 966                  * Take came in we have not heard about yet,
 967                  * add in an initial atom in runnable state:
 968                  */
 969                 if (add_sched_out_event(in_events, 'R', timestamp))
 970                         return -1;
 971         }
 972         add_sched_in_event(in_events, timestamp);
 973
 974         return 0;
 975 }
 976
 977 static int latency_runtime_event(struct perf_sched *sched,
 978                                  struct perf_evsel *evsel,
 979                                  struct perf_sample *sample,
 980                                  struct machine *machine)
 981 {
 982         const u32 pid      = perf_evsel__intval(evsel, sample, "pid");
 983         const u64 runtime  = perf_evsel__intval(evsel, sample, "runtime");
 984         struct thread *thread = machine__findnew_thread(machine, -1, pid);
 985         struct work_atoms *atoms = thread_atoms_search(&sched->atom_root, thread, &sched->cmp_pid);
 986         u64 timestamp = sample->time;
 987         int cpu = sample->cpu;
 988
 989         BUG_ON(cpu >= MAX_CPUS || cpu < 0);
 990         if (!atoms) {
 991                 if (thread_atoms_insert(sched, thread))
 992                         return -1;
 993                 atoms = thread_atoms_search(&sched->atom_root, thread, &sched->cmp_pid);
 994                 if (!atoms) {
 995                         pr_err("in-event: Internal tree error");
 996                         return -1;
 997                 }
 998                 if (add_sched_out_event(atoms, 'R', timestamp))
 999                         return -1;
1000         }
1001
1002         add_runtime_event(atoms, runtime, timestamp);
1003         return 0;
1004 }
1005
1006 static int latency_wakeup_event(struct perf_sched *sched,
1007                                 struct perf_evsel *evsel,
1008                                 struct perf_sample *sample,
1009                                 struct machine *machine)
1010 {
1011         const u32 pid     = perf_evsel__intval(evsel, sample, "pid");
1012         struct work_atoms *atoms;
1013         struct work_atom *atom;
1014         struct thread *wakee;
1015         u64 timestamp = sample->time;
1016
1017         wakee = machine__findnew_thread(machine, -1, pid);
1018         atoms = thread_atoms_search(&sched->atom_root, wakee, &sched->cmp_pid);
1019         if (!atoms) {
1020                 if (thread_atoms_insert(sched, wakee))
1021                         return -1;
1022                 atoms = thread_atoms_search(&sched->atom_root, wakee, &sched->cmp_pid);
1023                 if (!atoms) {
1024                         pr_err("wakeup-event: Internal tree error");
1025                         return -1;
1026                 }
1027                 if (add_sched_out_event(atoms, 'S', timestamp))
1028                         return -1;
1029         }
1030
1031         BUG_ON(list_empty(&atoms->work_list));
1032
1033         atom = list_entry(atoms->work_list.prev, struct work_atom, list);
1034
1035         /*
1036          * As we do not guarantee the wakeup event happens when
1037          * task is out of run queue, also may happen when task is
1038          * on run queue and wakeup only change ->state to TASK_RUNNING,
1039          * then we should not set the ->wake_up_time when wake up a
1040          * task which is on run queue.
1041          *
1042          * You WILL be missing events if you've recorded only
1043          * one CPU, or are only looking at only one, so don't
1044          * skip in this case.
1045          */
1046         if (sched->profile_cpu == -1 && atom->state != THREAD_SLEEPING)
1047                 return 0;
1048
1049         sched->nr_timestamps++;
1050         if (atom->sched_out_time > timestamp) {
1051                 sched->nr_unordered_timestamps++;
1052                 return 0;
1053         }
1054
1055         atom->state = THREAD_WAIT_CPU;
1056         atom->wake_up_time = timestamp;
1057         return 0;
1058 }
1059
1060 static int latency_migrate_task_event(struct perf_sched *sched,
1061                                       struct perf_evsel *evsel,
1062                                       struct perf_sample *sample,
1063                                       struct machine *machine)
1064 {
1065         const u32 pid = perf_evsel__intval(evsel, sample, "pid");
1066         u64 timestamp = sample->time;
1067         struct work_atoms *atoms;
1068         struct work_atom *atom;
1069         struct thread *migrant;
1070
1071         /*
1072          * Only need to worry about migration when profiling one CPU.
1073          */
1074         if (sched->profile_cpu == -1)
1075                 return 0;
1076
1077         migrant = machine__findnew_thread(machine, -1, pid);
1078         atoms = thread_atoms_search(&sched->atom_root, migrant, &sched->cmp_pid);
1079         if (!atoms) {
1080                 if (thread_atoms_insert(sched, migrant))
1081                         return -1;
1082                 register_pid(sched, migrant->tid, thread__comm_str(migrant));
1083                 atoms = thread_atoms_search(&sched->atom_root, migrant, &sched->cmp_pid);
1084                 if (!atoms) {
1085                         pr_err("migration-event: Internal tree error");
1086                         return -1;
1087                 }
1088                 if (add_sched_out_event(atoms, 'R', timestamp))
1089                         return -1;
1090         }
1091
1092         BUG_ON(list_empty(&atoms->work_list));
1093
1094         atom = list_entry(atoms->work_list.prev, struct work_atom, list);
1095         atom->sched_in_time = atom->sched_out_time = atom->wake_up_time = timestamp;
1096
1097         sched->nr_timestamps++;
1098
1099         if (atom->sched_out_time > timestamp)
1100                 sched->nr_unordered_timestamps++;
1101
1102         return 0;
1103 }
1104
1105 static void output_lat_thread(struct perf_sched *sched, struct work_atoms *work_list)
1106 {
1107         int i;
1108         int ret;
1109         u64 avg;
1110
1111         if (!work_list->nb_atoms)
1112                 return;
1113         /*
1114          * Ignore idle threads:
1115          */
1116         if (!strcmp(thread__comm_str(work_list->thread), "swapper"))
1117                 return;
1118
1119         sched->all_runtime += work_list->total_runtime;
1120         sched->all_count   += work_list->nb_atoms;
1121
1122         ret = printf("  %s:%d ", thread__comm_str(work_list->thread), work_list->thread->tid);
1123
1124         for (i = 0; i < 24 - ret; i++)
1125                 printf(" ");
1126
1127         avg = work_list->total_lat / work_list->nb_atoms;
1128
1129         printf("|%11.3f ms |%9" PRIu64 " | avg:%9.3f ms | max:%9.3f ms | max at: %13.6f s\n",
1130               (double)work_list->total_runtime / 1e6,
1131                  work_list->nb_atoms, (double)avg / 1e6,
1132                  (double)work_list->max_lat / 1e6,
1133                  (double)work_list->max_lat_at / 1e9);
1134 }
1135
1136 static int pid_cmp(struct work_atoms *l, struct work_atoms *r)
1137 {
1138         if (l->thread->tid < r->thread->tid)
1139                 return -1;
1140         if (l->thread->tid > r->thread->tid)
1141                 return 1;
1142
1143         return 0;
1144 }
1145
1146 static int avg_cmp(struct work_atoms *l, struct work_atoms *r)
1147 {
1148         u64 avgl, avgr;
1149
1150         if (!l->nb_atoms)
1151                 return -1;
1152
1153         if (!r->nb_atoms)
1154                 return 1;
1155
1156         avgl = l->total_lat / l->nb_atoms;
1157         avgr = r->total_lat / r->nb_atoms;
1158
1159         if (avgl < avgr)
1160                 return -1;
1161         if (avgl > avgr)
1162                 return 1;
1163
1164         return 0;
1165 }
1166
1167 static int max_cmp(struct work_atoms *l, struct work_atoms *r)
1168 {
1169         if (l->max_lat < r->max_lat)
1170                 return -1;
1171         if (l->max_lat > r->max_lat)
1172                 return 1;
1173
1174         return 0;
1175 }
1176
1177 static int switch_cmp(struct work_atoms *l, struct work_atoms *r)
1178 {
1179         if (l->nb_atoms < r->nb_atoms)
1180                 return -1;
1181         if (l->nb_atoms > r->nb_atoms)
1182                 return 1;
1183
1184         return 0;
1185 }
1186
1187 static int runtime_cmp(struct work_atoms *l, struct work_atoms *r)
1188 {
1189         if (l->total_runtime < r->total_runtime)
1190                 return -1;
1191         if (l->total_runtime > r->total_runtime)
1192                 return 1;
1193
1194         return 0;
1195 }
1196
1197 static int sort_dimension__add(const char *tok, struct list_head *list)
1198 {
1199         size_t i;
1200         static struct sort_dimension avg_sort_dimension = {
1201                 .name = "avg",
1202                 .cmp  = avg_cmp,
1203         };
1204         static struct sort_dimension max_sort_dimension = {
1205                 .name = "max",
1206                 .cmp  = max_cmp,
1207         };
1208         static struct sort_dimension pid_sort_dimension = {
1209                 .name = "pid",
1210                 .cmp  = pid_cmp,
1211         };
1212         static struct sort_dimension runtime_sort_dimension = {
1213                 .name = "runtime",
1214                 .cmp  = runtime_cmp,
1215         };
1216         static struct sort_dimension switch_sort_dimension = {
1217                 .name = "switch",
1218                 .cmp  = switch_cmp,
1219         };
1220         struct sort_dimension *available_sorts[] = {
1221                 &pid_sort_dimension,
1222                 &avg_sort_dimension,
1223                 &max_sort_dimension,
1224                 &switch_sort_dimension,
1225                 &runtime_sort_dimension,
1226         };
1227
1228         for (i = 0; i < ARRAY_SIZE(available_sorts); i++) {
1229                 if (!strcmp(available_sorts[i]->name, tok)) {
1230                         list_add_tail(&available_sorts[i]->list, list);
1231
1232                         return 0;
1233                 }
1234         }
1235
1236         return -1;
1237 }
1238
1239 static void perf_sched__sort_lat(struct perf_sched *sched)
1240 {
1241         struct rb_node *node;
1242
1243         for (;;) {
1244                 struct work_atoms *data;
1245                 node = rb_first(&sched->atom_root);
1246                 if (!node)
1247                         break;
1248
1249                 rb_erase(node, &sched->atom_root);
1250                 data = rb_entry(node, struct work_atoms, node);
1251                 __thread_latency_insert(&sched->sorted_atom_root, data, &sched->sort_list);
1252         }
1253 }
1254
1255 static int process_sched_wakeup_event(struct perf_tool *tool,
1256                                       struct perf_evsel *evsel,
1257                                       struct perf_sample *sample,
1258                                       struct machine *machine)
1259 {
1260         struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
1261
1262         if (sched->tp_handler->wakeup_event)
1263                 return sched->tp_handler->wakeup_event(sched, evsel, sample, machine);
1264
1265         return 0;
1266 }
1267
1268 static int map_switch_event(struct perf_sched *sched, struct perf_evsel *evsel,
1269                             struct perf_sample *sample, struct machine *machine)
1270 {
1271         const u32 next_pid = perf_evsel__intval(evsel, sample, "next_pid");
1272         struct thread *sched_in;
1273         int new_shortname;
1274         u64 timestamp0, timestamp = sample->time;
1275         s64 delta;
1276         int cpu, this_cpu = sample->cpu;
1277
1278         BUG_ON(this_cpu >= MAX_CPUS || this_cpu < 0);
1279
1280         if (this_cpu > sched->max_cpu)
1281                 sched->max_cpu = this_cpu;
1282
1283         timestamp0 = sched->cpu_last_switched[this_cpu];
1284         sched->cpu_last_switched[this_cpu] = timestamp;
1285         if (timestamp0)
1286                 delta = timestamp - timestamp0;
1287         else
1288                 delta = 0;
1289
1290         if (delta < 0) {
1291                 pr_err("hm, delta: %" PRIu64 " < 0 ?\n", delta);
1292                 return -1;
1293         }
1294
1295         sched_in = machine__findnew_thread(machine, -1, next_pid);
1296
1297         sched->curr_thread[this_cpu] = sched_in;
1298
1299         printf("  ");
1300
1301         new_shortname = 0;
1302         if (!sched_in->shortname[0]) {
1303                 if (!strcmp(thread__comm_str(sched_in), "swapper")) {
1304                         /*
1305                          * Don't allocate a letter-number for swapper:0
1306                          * as a shortname. Instead, we use '.' for it.
1307                          */
1308                         sched_in->shortname[0] = '.';
1309                         sched_in->shortname[1] = ' ';
1310                 } else {
1311                         sched_in->shortname[0] = sched->next_shortname1;
1312                         sched_in->shortname[1] = sched->next_shortname2;
1313
1314                         if (sched->next_shortname1 < 'Z') {
1315                                 sched->next_shortname1++;
1316                         } else {
1317                                 sched->next_shortname1 = 'A';
1318                                 if (sched->next_shortname2 < '9')
1319                                         sched->next_shortname2++;
1320                                 else
1321                                         sched->next_shortname2 = '0';
1322                         }
1323                 }
1324                 new_shortname = 1;
1325         }
1326
1327         for (cpu = 0; cpu <= sched->max_cpu; cpu++) {
1328                 if (cpu != this_cpu)
1329                         printf(" ");
1330                 else
1331                         printf("*");
1332
1333                 if (sched->curr_thread[cpu])
1334                         printf("%2s ", sched->curr_thread[cpu]->shortname);
1335                 else
1336                         printf("   ");
1337         }
1338
1339         printf("  %12.6f secs ", (double)timestamp/1e9);
1340         if (new_shortname) {
1341                 printf("%s => %s:%d\n",
1342                        sched_in->shortname, thread__comm_str(sched_in), sched_in->tid);
1343         } else {
1344                 printf("\n");
1345         }
1346
1347         return 0;
1348 }
1349
1350 static int process_sched_switch_event(struct perf_tool *tool,
1351                                       struct perf_evsel *evsel,
1352                                       struct perf_sample *sample,
1353                                       struct machine *machine)
1354 {
1355         struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
1356         int this_cpu = sample->cpu, err = 0;
1357         u32 prev_pid = perf_evsel__intval(evsel, sample, "prev_pid"),
1358             next_pid = perf_evsel__intval(evsel, sample, "next_pid");
1359
1360         if (sched->curr_pid[this_cpu] != (u32)-1) {
1361                 /*
1362                  * Are we trying to switch away a PID that is
1363                  * not current?
1364                  */
1365                 if (sched->curr_pid[this_cpu] != prev_pid)
1366                         sched->nr_context_switch_bugs++;
1367         }
1368
1369         if (sched->tp_handler->switch_event)
1370                 err = sched->tp_handler->switch_event(sched, evsel, sample, machine);
1371
1372         sched->curr_pid[this_cpu] = next_pid;
1373         return err;
1374 }
1375
1376 static int process_sched_runtime_event(struct perf_tool *tool,
1377                                        struct perf_evsel *evsel,
1378                                        struct perf_sample *sample,
1379                                        struct machine *machine)
1380 {
1381         struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
1382
1383         if (sched->tp_handler->runtime_event)
1384                 return sched->tp_handler->runtime_event(sched, evsel, sample, machine);
1385
1386         return 0;
1387 }
1388
1389 static int perf_sched__process_fork_event(struct perf_tool *tool,
1390                                           union perf_event *event,
1391                                           struct perf_sample *sample,
1392                                           struct machine *machine)
1393 {
1394         struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
1395
1396         /* run the fork event through the perf machineruy */
1397         perf_event__process_fork(tool, event, sample, machine);
1398
1399         /* and then run additional processing needed for this command */
1400         if (sched->tp_handler->fork_event)
1401                 return sched->tp_handler->fork_event(sched, event, machine);
1402
1403         return 0;
1404 }
1405
1406 static int process_sched_migrate_task_event(struct perf_tool *tool,
1407                                             struct perf_evsel *evsel,
1408                                             struct perf_sample *sample,
1409                                             struct machine *machine)
1410 {
1411         struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
1412
1413         if (sched->tp_handler->migrate_task_event)
1414                 return sched->tp_handler->migrate_task_event(sched, evsel, sample, machine);
1415
1416         return 0;
1417 }
1418
1419 typedef int (*tracepoint_handler)(struct perf_tool *tool,
1420                                   struct perf_evsel *evsel,
1421                                   struct perf_sample *sample,
1422                                   struct machine *machine);
1423
1424 static int perf_sched__process_tracepoint_sample(struct perf_tool *tool __maybe_unused,
1425                                                  union perf_event *event __maybe_unused,
1426                                                  struct perf_sample *sample,
1427                                                  struct perf_evsel *evsel,
1428                                                  struct machine *machine)
1429 {
1430         int err = 0;
1431
1432         evsel->hists.stats.total_period += sample->period;
1433         hists__inc_nr_samples(&evsel->hists, true);
1434
1435         if (evsel->handler != NULL) {
1436                 tracepoint_handler f = evsel->handler;
1437                 err = f(tool, evsel, sample, machine);
1438         }
1439
1440         return err;
1441 }
1442
1443 static int perf_sched__read_events(struct perf_sched *sched,
1444                                    struct perf_session **psession)
1445 {
1446         const struct perf_evsel_str_handler handlers[] = {
1447                 { "sched:sched_switch",       process_sched_switch_event, },
1448                 { "sched:sched_stat_runtime", process_sched_runtime_event, },
1449                 { "sched:sched_wakeup",       process_sched_wakeup_event, },
1450                 { "sched:sched_wakeup_new",   process_sched_wakeup_event, },
1451                 { "sched:sched_migrate_task", process_sched_migrate_task_event, },
1452         };
1453         struct perf_session *session;
1454         struct perf_data_file file = {
1455                 .path = input_name,
1456                 .mode = PERF_DATA_MODE_READ,
1457         };
1458
1459         session = perf_session__new(&file, false, &sched->tool);
1460         if (session == NULL) {
1461                 pr_debug("No Memory for session\n");
1462                 return -1;
1463         }
1464
1465         if (perf_session__set_tracepoints_handlers(session, handlers))
1466                 goto out_delete;
1467
1468         if (perf_session__has_traces(session, "record -R")) {
1469                 int err = perf_session__process_events(session, &sched->tool);
1470                 if (err) {
1471                         pr_err("Failed to process events, error %d", err);
1472                         goto out_delete;
1473                 }
1474
1475                 sched->nr_events      = session->stats.nr_events[0];
1476                 sched->nr_lost_events = session->stats.total_lost;
1477                 sched->nr_lost_chunks = session->stats.nr_events[PERF_RECORD_LOST];
1478         }
1479
1480         if (psession)
1481                 *psession = session;
1482         else
1483                 perf_session__delete(session);
1484
1485         return 0;
1486
1487 out_delete:
1488         perf_session__delete(session);
1489         return -1;
1490 }
1491
1492 static void print_bad_events(struct perf_sched *sched)
1493 {
1494         if (sched->nr_unordered_timestamps && sched->nr_timestamps) {
1495                 printf("  INFO: %.3f%% unordered timestamps (%ld out of %ld)\n",
1496                         (double)sched->nr_unordered_timestamps/(double)sched->nr_timestamps*100.0,
1497                         sched->nr_unordered_timestamps, sched->nr_timestamps);
1498         }
1499         if (sched->nr_lost_events && sched->nr_events) {
1500                 printf("  INFO: %.3f%% lost events (%ld out of %ld, in %ld chunks)\n",
1501                         (double)sched->nr_lost_events/(double)sched->nr_events * 100.0,
1502                         sched->nr_lost_events, sched->nr_events, sched->nr_lost_chunks);
1503         }
1504         if (sched->nr_context_switch_bugs && sched->nr_timestamps) {
1505                 printf("  INFO: %.3f%% context switch bugs (%ld out of %ld)",
1506                         (double)sched->nr_context_switch_bugs/(double)sched->nr_timestamps*100.0,
1507                         sched->nr_context_switch_bugs, sched->nr_timestamps);
1508                 if (sched->nr_lost_events)
1509                         printf(" (due to lost events?)");
1510                 printf("\n");
1511         }
1512 }
1513
1514 static int perf_sched__lat(struct perf_sched *sched)
1515 {
1516         struct rb_node *next;
1517         struct perf_session *session;
1518
1519         setup_pager();
1520
1521         /* save session -- references to threads are held in work_list */
1522         if (perf_sched__read_events(sched, &session))
1523                 return -1;
1524
1525         perf_sched__sort_lat(sched);
1526
1527         printf("\n -----------------------------------------------------------------------------------------------------------------\n");
1528         printf("  Task                  |   Runtime ms  | Switches | Average delay ms | Maximum delay ms | Maximum delay at       |\n");
1529         printf(" -----------------------------------------------------------------------------------------------------------------\n");
1530
1531         next = rb_first(&sched->sorted_atom_root);
1532
1533         while (next) {
1534                 struct work_atoms *work_list;
1535
1536                 work_list = rb_entry(next, struct work_atoms, node);
1537                 output_lat_thread(sched, work_list);
1538                 next = rb_next(next);
1539         }
1540
1541         printf(" -----------------------------------------------------------------------------------------------------------------\n");
1542         printf("  TOTAL:                |%11.3f ms |%9" PRIu64 " |\n",
1543                 (double)sched->all_runtime / 1e6, sched->all_count);
1544
1545         printf(" ---------------------------------------------------\n");
1546
1547         print_bad_events(sched);
1548         printf("\n");
1549
1550         perf_session__delete(session);
1551         return 0;
1552 }
1553
1554 static int perf_sched__map(struct perf_sched *sched)
1555 {
1556         sched->max_cpu = sysconf(_SC_NPROCESSORS_CONF);
1557
1558         setup_pager();
1559         if (perf_sched__read_events(sched, NULL))
1560                 return -1;
1561         print_bad_events(sched);
1562         return 0;
1563 }
1564
1565 static int perf_sched__replay(struct perf_sched *sched)
1566 {
1567         unsigned long i;
1568
1569         calibrate_run_measurement_overhead(sched);
1570         calibrate_sleep_measurement_overhead(sched);
1571
1572         test_calibrations(sched);
1573
1574         if (perf_sched__read_events(sched, NULL))
1575                 return -1;
1576
1577         printf("nr_run_events:        %ld\n", sched->nr_run_events);
1578         printf("nr_sleep_events:      %ld\n", sched->nr_sleep_events);
1579         printf("nr_wakeup_events:     %ld\n", sched->nr_wakeup_events);
1580
1581         if (sched->targetless_wakeups)
1582                 printf("target-less wakeups:  %ld\n", sched->targetless_wakeups);
1583         if (sched->multitarget_wakeups)
1584                 printf("multi-target wakeups: %ld\n", sched->multitarget_wakeups);
1585         if (sched->nr_run_events_optimized)
1586                 printf("run atoms optimized: %ld\n",
1587                         sched->nr_run_events_optimized);
1588
1589         print_task_traces(sched);
1590         add_cross_task_wakeups(sched);
1591
1592         create_tasks(sched);
1593         printf("------------------------------------------------------------\n");
1594         for (i = 0; i < sched->replay_repeat; i++)
1595                 run_one_test(sched);
1596
1597         return 0;
1598 }
1599
1600 static void setup_sorting(struct perf_sched *sched, const struct option *options,
1601                           const char * const usage_msg[])
1602 {
1603         char *tmp, *tok, *str = strdup(sched->sort_order);
1604
1605         for (tok = strtok_r(str, ", ", &tmp);
1606                         tok; tok = strtok_r(NULL, ", ", &tmp)) {
1607                 if (sort_dimension__add(tok, &sched->sort_list) < 0) {
1608                         error("Unknown --sort key: `%s'", tok);
1609                         usage_with_options(usage_msg, options);
1610                 }
1611         }
1612
1613         free(str);
1614
1615         sort_dimension__add("pid", &sched->cmp_pid);
1616 }
1617
1618 static int __cmd_record(int argc, const char **argv)
1619 {
1620         unsigned int rec_argc, i, j;
1621         const char **rec_argv;
1622         const char * const record_args[] = {
1623                 "record",
1624                 "-a",
1625                 "-R",
1626                 "-m", "1024",
1627                 "-c", "1",
1628                 "-e", "sched:sched_switch",
1629                 "-e", "sched:sched_stat_wait",
1630                 "-e", "sched:sched_stat_sleep",
1631                 "-e", "sched:sched_stat_iowait",
1632                 "-e", "sched:sched_stat_runtime",
1633                 "-e", "sched:sched_process_fork",
1634                 "-e", "sched:sched_wakeup",
1635                 "-e", "sched:sched_wakeup_new",
1636                 "-e", "sched:sched_migrate_task",
1637         };
1638
1639         rec_argc = ARRAY_SIZE(record_args) + argc - 1;
1640         rec_argv = calloc(rec_argc + 1, sizeof(char *));
1641
1642         if (rec_argv == NULL)
1643                 return -ENOMEM;
1644
1645         for (i = 0; i < ARRAY_SIZE(record_args); i++)
1646                 rec_argv[i] = strdup(record_args[i]);
1647
1648         for (j = 1; j < (unsigned int)argc; j++, i++)
1649                 rec_argv[i] = argv[j];
1650
1651         BUG_ON(i != rec_argc);
1652
1653         return cmd_record(i, rec_argv, NULL);
1654 }
1655
1656 int cmd_sched(int argc, const char **argv, const char *prefix __maybe_unused)
1657 {
1658         const char default_sort_order[] = "avg, max, switch, runtime";
1659         struct perf_sched sched = {
1660                 .tool = {
1661                         .sample          = perf_sched__process_tracepoint_sample,
1662                         .comm            = perf_event__process_comm,
1663                         .lost            = perf_event__process_lost,
1664                         .fork            = perf_sched__process_fork_event,
1665                         .ordered_samples = true,
1666                 },
1667                 .cmp_pid              = LIST_HEAD_INIT(sched.cmp_pid),
1668                 .sort_list            = LIST_HEAD_INIT(sched.sort_list),
1669                 .start_work_mutex     = PTHREAD_MUTEX_INITIALIZER,
1670                 .work_done_wait_mutex = PTHREAD_MUTEX_INITIALIZER,
1671                 .sort_order           = default_sort_order,
1672                 .replay_repeat        = 10,
1673                 .profile_cpu          = -1,
1674                 .next_shortname1      = 'A',
1675                 .next_shortname2      = '0',
1676         };
1677         const struct option latency_options[] = {
1678         OPT_STRING('s', "sort", &sched.sort_order, "key[,key2...]",
1679                    "sort by key(s): runtime, switch, avg, max"),
1680         OPT_INCR('v', "verbose", &verbose,
1681                     "be more verbose (show symbol address, etc)"),
1682         OPT_INTEGER('C', "CPU", &sched.profile_cpu,
1683                     "CPU to profile on"),
1684         OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
1685                     "dump raw trace in ASCII"),
1686         OPT_END()
1687         };
1688         const struct option replay_options[] = {
1689         OPT_UINTEGER('r', "repeat", &sched.replay_repeat,
1690                      "repeat the workload replay N times (-1: infinite)"),
1691         OPT_INCR('v', "verbose", &verbose,
1692                     "be more verbose (show symbol address, etc)"),
1693         OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
1694                     "dump raw trace in ASCII"),
1695         OPT_END()
1696         };
1697         const struct option sched_options[] = {
1698         OPT_STRING('i', "input", &input_name, "file",
1699                     "input file name"),
1700         OPT_INCR('v', "verbose", &verbose,
1701                     "be more verbose (show symbol address, etc)"),
1702         OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
1703                     "dump raw trace in ASCII"),
1704         OPT_END()
1705         };
1706         const char * const latency_usage[] = {
1707                 "perf sched latency [<options>]",
1708                 NULL
1709         };
1710         const char * const replay_usage[] = {
1711                 "perf sched replay [<options>]",
1712                 NULL
1713         };
1714         const char *const sched_subcommands[] = { "record", "latency", "map",
1715                                                   "replay", "script", NULL };
1716         const char *sched_usage[] = {
1717                 NULL,
1718                 NULL
1719         };
1720         struct trace_sched_handler lat_ops  = {
1721                 .wakeup_event       = latency_wakeup_event,
1722                 .switch_event       = latency_switch_event,
1723                 .runtime_event      = latency_runtime_event,
1724                 .migrate_task_event = latency_migrate_task_event,
1725         };
1726         struct trace_sched_handler map_ops  = {
1727                 .switch_event       = map_switch_event,
1728         };
1729         struct trace_sched_handler replay_ops  = {
1730                 .wakeup_event       = replay_wakeup_event,
1731                 .switch_event       = replay_switch_event,
1732                 .fork_event         = replay_fork_event,
1733         };
1734         unsigned int i;
1735
1736         for (i = 0; i < ARRAY_SIZE(sched.curr_pid); i++)
1737                 sched.curr_pid[i] = -1;
1738
1739         argc = parse_options_subcommand(argc, argv, sched_options, sched_subcommands,
1740                                         sched_usage, PARSE_OPT_STOP_AT_NON_OPTION);
1741         if (!argc)
1742                 usage_with_options(sched_usage, sched_options);
1743
1744         /*
1745          * Aliased to 'perf script' for now:
1746          */
1747         if (!strcmp(argv[0], "script"))
1748                 return cmd_script(argc, argv, prefix);
1749
1750         symbol__init();
1751         if (!strncmp(argv[0], "rec", 3)) {
1752                 return __cmd_record(argc, argv);
1753         } else if (!strncmp(argv[0], "lat", 3)) {
1754                 sched.tp_handler = &lat_ops;
1755                 if (argc > 1) {
1756                         argc = parse_options(argc, argv, latency_options, latency_usage, 0);
1757                         if (argc)
1758                                 usage_with_options(latency_usage, latency_options);
1759                 }
1760                 setup_sorting(&sched, latency_options, latency_usage);
1761                 return perf_sched__lat(&sched);
1762         } else if (!strcmp(argv[0], "map")) {
1763                 sched.tp_handler = &map_ops;
1764                 setup_sorting(&sched, latency_options, latency_usage);
1765                 return perf_sched__map(&sched);
1766         } else if (!strncmp(argv[0], "rep", 3)) {
1767                 sched.tp_handler = &replay_ops;
1768                 if (argc) {
1769                         argc = parse_options(argc, argv, replay_options, replay_usage, 0);
1770                         if (argc)
1771                                 usage_with_options(replay_usage, replay_options);
1772                 }
1773                 return perf_sched__replay(&sched);
1774         } else {
1775                 usage_with_options(sched_usage, sched_options);
1776         }
1777
1778         return 0;
1779 }