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v4.6
 
   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 <subcmd/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#include <api/fs/fs.h>
 
 
 
 
 
  27
  28#define PR_SET_NAME		15               /* Set process name */
  29#define MAX_CPUS		4096
  30#define COMM_LEN		20
  31#define SYM_LEN			129
  32#define MAX_PID			1024000
  33
 
 
 
  34struct sched_atom;
  35
  36struct task_desc {
  37	unsigned long		nr;
  38	unsigned long		pid;
  39	char			comm[COMM_LEN];
  40
  41	unsigned long		nr_events;
  42	unsigned long		curr_event;
  43	struct sched_atom	**atoms;
  44
  45	pthread_t		thread;
  46	sem_t			sleep_sem;
  47
  48	sem_t			ready_for_work;
  49	sem_t			work_done_sem;
  50
  51	u64			cpu_usage;
  52};
  53
  54enum sched_event_type {
  55	SCHED_EVENT_RUN,
  56	SCHED_EVENT_SLEEP,
  57	SCHED_EVENT_WAKEUP,
  58	SCHED_EVENT_MIGRATION,
  59};
  60
  61struct sched_atom {
  62	enum sched_event_type	type;
  63	int			specific_wait;
  64	u64			timestamp;
  65	u64			duration;
  66	unsigned long		nr;
  67	sem_t			*wait_sem;
  68	struct task_desc	*wakee;
  69};
  70
  71#define TASK_STATE_TO_CHAR_STR "RSDTtZXxKWP"
  72
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  73enum thread_state {
  74	THREAD_SLEEPING = 0,
  75	THREAD_WAIT_CPU,
  76	THREAD_SCHED_IN,
  77	THREAD_IGNORE
  78};
  79
  80struct work_atom {
  81	struct list_head	list;
  82	enum thread_state	state;
  83	u64			sched_out_time;
  84	u64			wake_up_time;
  85	u64			sched_in_time;
  86	u64			runtime;
  87};
  88
  89struct work_atoms {
  90	struct list_head	work_list;
  91	struct thread		*thread;
  92	struct rb_node		node;
  93	u64			max_lat;
  94	u64			max_lat_at;
  95	u64			total_lat;
  96	u64			nb_atoms;
  97	u64			total_runtime;
  98	int			num_merged;
  99};
 100
 101typedef int (*sort_fn_t)(struct work_atoms *, struct work_atoms *);
 102
 103struct perf_sched;
 104
 105struct trace_sched_handler {
 106	int (*switch_event)(struct perf_sched *sched, struct perf_evsel *evsel,
 107			    struct perf_sample *sample, struct machine *machine);
 108
 109	int (*runtime_event)(struct perf_sched *sched, struct perf_evsel *evsel,
 110			     struct perf_sample *sample, struct machine *machine);
 111
 112	int (*wakeup_event)(struct perf_sched *sched, struct perf_evsel *evsel,
 113			    struct perf_sample *sample, struct machine *machine);
 114
 115	/* PERF_RECORD_FORK event, not sched_process_fork tracepoint */
 116	int (*fork_event)(struct perf_sched *sched, union perf_event *event,
 117			  struct machine *machine);
 118
 119	int (*migrate_task_event)(struct perf_sched *sched,
 120				  struct perf_evsel *evsel,
 121				  struct perf_sample *sample,
 122				  struct machine *machine);
 123};
 124
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 125struct perf_sched {
 126	struct perf_tool tool;
 127	const char	 *sort_order;
 128	unsigned long	 nr_tasks;
 129	struct task_desc **pid_to_task;
 130	struct task_desc **tasks;
 131	const struct trace_sched_handler *tp_handler;
 132	pthread_mutex_t	 start_work_mutex;
 133	pthread_mutex_t	 work_done_wait_mutex;
 134	int		 profile_cpu;
 135/*
 136 * Track the current task - that way we can know whether there's any
 137 * weird events, such as a task being switched away that is not current.
 138 */
 139	int		 max_cpu;
 140	u32		 curr_pid[MAX_CPUS];
 141	struct thread	 *curr_thread[MAX_CPUS];
 142	char		 next_shortname1;
 143	char		 next_shortname2;
 144	unsigned int	 replay_repeat;
 145	unsigned long	 nr_run_events;
 146	unsigned long	 nr_sleep_events;
 147	unsigned long	 nr_wakeup_events;
 148	unsigned long	 nr_sleep_corrections;
 149	unsigned long	 nr_run_events_optimized;
 150	unsigned long	 targetless_wakeups;
 151	unsigned long	 multitarget_wakeups;
 152	unsigned long	 nr_runs;
 153	unsigned long	 nr_timestamps;
 154	unsigned long	 nr_unordered_timestamps;
 155	unsigned long	 nr_context_switch_bugs;
 156	unsigned long	 nr_events;
 157	unsigned long	 nr_lost_chunks;
 158	unsigned long	 nr_lost_events;
 159	u64		 run_measurement_overhead;
 160	u64		 sleep_measurement_overhead;
 161	u64		 start_time;
 162	u64		 cpu_usage;
 163	u64		 runavg_cpu_usage;
 164	u64		 parent_cpu_usage;
 165	u64		 runavg_parent_cpu_usage;
 166	u64		 sum_runtime;
 167	u64		 sum_fluct;
 168	u64		 run_avg;
 169	u64		 all_runtime;
 170	u64		 all_count;
 171	u64		 cpu_last_switched[MAX_CPUS];
 172	struct rb_root	 atom_root, sorted_atom_root, merged_atom_root;
 173	struct list_head sort_list, cmp_pid;
 174	bool force;
 175	bool skip_merge;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 176};
 177
 
 
 
 
 
 178static u64 get_nsecs(void)
 179{
 180	struct timespec ts;
 181
 182	clock_gettime(CLOCK_MONOTONIC, &ts);
 183
 184	return ts.tv_sec * 1000000000ULL + ts.tv_nsec;
 185}
 186
 187static void burn_nsecs(struct perf_sched *sched, u64 nsecs)
 188{
 189	u64 T0 = get_nsecs(), T1;
 190
 191	do {
 192		T1 = get_nsecs();
 193	} while (T1 + sched->run_measurement_overhead < T0 + nsecs);
 194}
 195
 196static void sleep_nsecs(u64 nsecs)
 197{
 198	struct timespec ts;
 199
 200	ts.tv_nsec = nsecs % 999999999;
 201	ts.tv_sec = nsecs / 999999999;
 202
 203	nanosleep(&ts, NULL);
 204}
 205
 206static void calibrate_run_measurement_overhead(struct perf_sched *sched)
 207{
 208	u64 T0, T1, delta, min_delta = 1000000000ULL;
 209	int i;
 210
 211	for (i = 0; i < 10; i++) {
 212		T0 = get_nsecs();
 213		burn_nsecs(sched, 0);
 214		T1 = get_nsecs();
 215		delta = T1-T0;
 216		min_delta = min(min_delta, delta);
 217	}
 218	sched->run_measurement_overhead = min_delta;
 219
 220	printf("run measurement overhead: %" PRIu64 " nsecs\n", min_delta);
 221}
 222
 223static void calibrate_sleep_measurement_overhead(struct perf_sched *sched)
 224{
 225	u64 T0, T1, delta, min_delta = 1000000000ULL;
 226	int i;
 227
 228	for (i = 0; i < 10; i++) {
 229		T0 = get_nsecs();
 230		sleep_nsecs(10000);
 231		T1 = get_nsecs();
 232		delta = T1-T0;
 233		min_delta = min(min_delta, delta);
 234	}
 235	min_delta -= 10000;
 236	sched->sleep_measurement_overhead = min_delta;
 237
 238	printf("sleep measurement overhead: %" PRIu64 " nsecs\n", min_delta);
 239}
 240
 241static struct sched_atom *
 242get_new_event(struct task_desc *task, u64 timestamp)
 243{
 244	struct sched_atom *event = zalloc(sizeof(*event));
 245	unsigned long idx = task->nr_events;
 246	size_t size;
 247
 248	event->timestamp = timestamp;
 249	event->nr = idx;
 250
 251	task->nr_events++;
 252	size = sizeof(struct sched_atom *) * task->nr_events;
 253	task->atoms = realloc(task->atoms, size);
 254	BUG_ON(!task->atoms);
 255
 256	task->atoms[idx] = event;
 257
 258	return event;
 259}
 260
 261static struct sched_atom *last_event(struct task_desc *task)
 262{
 263	if (!task->nr_events)
 264		return NULL;
 265
 266	return task->atoms[task->nr_events - 1];
 267}
 268
 269static void add_sched_event_run(struct perf_sched *sched, struct task_desc *task,
 270				u64 timestamp, u64 duration)
 271{
 272	struct sched_atom *event, *curr_event = last_event(task);
 273
 274	/*
 275	 * optimize an existing RUN event by merging this one
 276	 * to it:
 277	 */
 278	if (curr_event && curr_event->type == SCHED_EVENT_RUN) {
 279		sched->nr_run_events_optimized++;
 280		curr_event->duration += duration;
 281		return;
 282	}
 283
 284	event = get_new_event(task, timestamp);
 285
 286	event->type = SCHED_EVENT_RUN;
 287	event->duration = duration;
 288
 289	sched->nr_run_events++;
 290}
 291
 292static void add_sched_event_wakeup(struct perf_sched *sched, struct task_desc *task,
 293				   u64 timestamp, struct task_desc *wakee)
 294{
 295	struct sched_atom *event, *wakee_event;
 296
 297	event = get_new_event(task, timestamp);
 298	event->type = SCHED_EVENT_WAKEUP;
 299	event->wakee = wakee;
 300
 301	wakee_event = last_event(wakee);
 302	if (!wakee_event || wakee_event->type != SCHED_EVENT_SLEEP) {
 303		sched->targetless_wakeups++;
 304		return;
 305	}
 306	if (wakee_event->wait_sem) {
 307		sched->multitarget_wakeups++;
 308		return;
 309	}
 310
 311	wakee_event->wait_sem = zalloc(sizeof(*wakee_event->wait_sem));
 312	sem_init(wakee_event->wait_sem, 0, 0);
 313	wakee_event->specific_wait = 1;
 314	event->wait_sem = wakee_event->wait_sem;
 315
 316	sched->nr_wakeup_events++;
 317}
 318
 319static void add_sched_event_sleep(struct perf_sched *sched, struct task_desc *task,
 320				  u64 timestamp, u64 task_state __maybe_unused)
 321{
 322	struct sched_atom *event = get_new_event(task, timestamp);
 323
 324	event->type = SCHED_EVENT_SLEEP;
 325
 326	sched->nr_sleep_events++;
 327}
 328
 329static struct task_desc *register_pid(struct perf_sched *sched,
 330				      unsigned long pid, const char *comm)
 331{
 332	struct task_desc *task;
 333	static int pid_max;
 334
 335	if (sched->pid_to_task == NULL) {
 336		if (sysctl__read_int("kernel/pid_max", &pid_max) < 0)
 337			pid_max = MAX_PID;
 338		BUG_ON((sched->pid_to_task = calloc(pid_max, sizeof(struct task_desc *))) == NULL);
 339	}
 340	if (pid >= (unsigned long)pid_max) {
 341		BUG_ON((sched->pid_to_task = realloc(sched->pid_to_task, (pid + 1) *
 342			sizeof(struct task_desc *))) == NULL);
 343		while (pid >= (unsigned long)pid_max)
 344			sched->pid_to_task[pid_max++] = NULL;
 345	}
 346
 347	task = sched->pid_to_task[pid];
 348
 349	if (task)
 350		return task;
 351
 352	task = zalloc(sizeof(*task));
 353	task->pid = pid;
 354	task->nr = sched->nr_tasks;
 355	strcpy(task->comm, comm);
 356	/*
 357	 * every task starts in sleeping state - this gets ignored
 358	 * if there's no wakeup pointing to this sleep state:
 359	 */
 360	add_sched_event_sleep(sched, task, 0, 0);
 361
 362	sched->pid_to_task[pid] = task;
 363	sched->nr_tasks++;
 364	sched->tasks = realloc(sched->tasks, sched->nr_tasks * sizeof(struct task_desc *));
 365	BUG_ON(!sched->tasks);
 366	sched->tasks[task->nr] = task;
 367
 368	if (verbose)
 369		printf("registered task #%ld, PID %ld (%s)\n", sched->nr_tasks, pid, comm);
 370
 371	return task;
 372}
 373
 374
 375static void print_task_traces(struct perf_sched *sched)
 376{
 377	struct task_desc *task;
 378	unsigned long i;
 379
 380	for (i = 0; i < sched->nr_tasks; i++) {
 381		task = sched->tasks[i];
 382		printf("task %6ld (%20s:%10ld), nr_events: %ld\n",
 383			task->nr, task->comm, task->pid, task->nr_events);
 384	}
 385}
 386
 387static void add_cross_task_wakeups(struct perf_sched *sched)
 388{
 389	struct task_desc *task1, *task2;
 390	unsigned long i, j;
 391
 392	for (i = 0; i < sched->nr_tasks; i++) {
 393		task1 = sched->tasks[i];
 394		j = i + 1;
 395		if (j == sched->nr_tasks)
 396			j = 0;
 397		task2 = sched->tasks[j];
 398		add_sched_event_wakeup(sched, task1, 0, task2);
 399	}
 400}
 401
 402static void perf_sched__process_event(struct perf_sched *sched,
 403				      struct sched_atom *atom)
 404{
 405	int ret = 0;
 406
 407	switch (atom->type) {
 408		case SCHED_EVENT_RUN:
 409			burn_nsecs(sched, atom->duration);
 410			break;
 411		case SCHED_EVENT_SLEEP:
 412			if (atom->wait_sem)
 413				ret = sem_wait(atom->wait_sem);
 414			BUG_ON(ret);
 415			break;
 416		case SCHED_EVENT_WAKEUP:
 417			if (atom->wait_sem)
 418				ret = sem_post(atom->wait_sem);
 419			BUG_ON(ret);
 420			break;
 421		case SCHED_EVENT_MIGRATION:
 422			break;
 423		default:
 424			BUG_ON(1);
 425	}
 426}
 427
 428static u64 get_cpu_usage_nsec_parent(void)
 429{
 430	struct rusage ru;
 431	u64 sum;
 432	int err;
 433
 434	err = getrusage(RUSAGE_SELF, &ru);
 435	BUG_ON(err);
 436
 437	sum =  ru.ru_utime.tv_sec*1e9 + ru.ru_utime.tv_usec*1e3;
 438	sum += ru.ru_stime.tv_sec*1e9 + ru.ru_stime.tv_usec*1e3;
 439
 440	return sum;
 441}
 442
 443static int self_open_counters(struct perf_sched *sched, unsigned long cur_task)
 444{
 445	struct perf_event_attr attr;
 446	char sbuf[STRERR_BUFSIZE], info[STRERR_BUFSIZE];
 447	int fd;
 448	struct rlimit limit;
 449	bool need_privilege = false;
 450
 451	memset(&attr, 0, sizeof(attr));
 452
 453	attr.type = PERF_TYPE_SOFTWARE;
 454	attr.config = PERF_COUNT_SW_TASK_CLOCK;
 455
 456force_again:
 457	fd = sys_perf_event_open(&attr, 0, -1, -1,
 458				 perf_event_open_cloexec_flag());
 459
 460	if (fd < 0) {
 461		if (errno == EMFILE) {
 462			if (sched->force) {
 463				BUG_ON(getrlimit(RLIMIT_NOFILE, &limit) == -1);
 464				limit.rlim_cur += sched->nr_tasks - cur_task;
 465				if (limit.rlim_cur > limit.rlim_max) {
 466					limit.rlim_max = limit.rlim_cur;
 467					need_privilege = true;
 468				}
 469				if (setrlimit(RLIMIT_NOFILE, &limit) == -1) {
 470					if (need_privilege && errno == EPERM)
 471						strcpy(info, "Need privilege\n");
 472				} else
 473					goto force_again;
 474			} else
 475				strcpy(info, "Have a try with -f option\n");
 476		}
 477		pr_err("Error: sys_perf_event_open() syscall returned "
 478		       "with %d (%s)\n%s", fd,
 479		       strerror_r(errno, sbuf, sizeof(sbuf)), info);
 480		exit(EXIT_FAILURE);
 481	}
 482	return fd;
 483}
 484
 485static u64 get_cpu_usage_nsec_self(int fd)
 486{
 487	u64 runtime;
 488	int ret;
 489
 490	ret = read(fd, &runtime, sizeof(runtime));
 491	BUG_ON(ret != sizeof(runtime));
 492
 493	return runtime;
 494}
 495
 496struct sched_thread_parms {
 497	struct task_desc  *task;
 498	struct perf_sched *sched;
 499	int fd;
 500};
 501
 502static void *thread_func(void *ctx)
 503{
 504	struct sched_thread_parms *parms = ctx;
 505	struct task_desc *this_task = parms->task;
 506	struct perf_sched *sched = parms->sched;
 507	u64 cpu_usage_0, cpu_usage_1;
 508	unsigned long i, ret;
 509	char comm2[22];
 510	int fd = parms->fd;
 511
 512	zfree(&parms);
 513
 514	sprintf(comm2, ":%s", this_task->comm);
 515	prctl(PR_SET_NAME, comm2);
 516	if (fd < 0)
 517		return NULL;
 518again:
 519	ret = sem_post(&this_task->ready_for_work);
 520	BUG_ON(ret);
 521	ret = pthread_mutex_lock(&sched->start_work_mutex);
 522	BUG_ON(ret);
 523	ret = pthread_mutex_unlock(&sched->start_work_mutex);
 524	BUG_ON(ret);
 525
 526	cpu_usage_0 = get_cpu_usage_nsec_self(fd);
 527
 528	for (i = 0; i < this_task->nr_events; i++) {
 529		this_task->curr_event = i;
 530		perf_sched__process_event(sched, this_task->atoms[i]);
 531	}
 532
 533	cpu_usage_1 = get_cpu_usage_nsec_self(fd);
 534	this_task->cpu_usage = cpu_usage_1 - cpu_usage_0;
 535	ret = sem_post(&this_task->work_done_sem);
 536	BUG_ON(ret);
 537
 538	ret = pthread_mutex_lock(&sched->work_done_wait_mutex);
 539	BUG_ON(ret);
 540	ret = pthread_mutex_unlock(&sched->work_done_wait_mutex);
 541	BUG_ON(ret);
 542
 543	goto again;
 544}
 545
 546static void create_tasks(struct perf_sched *sched)
 547{
 548	struct task_desc *task;
 549	pthread_attr_t attr;
 550	unsigned long i;
 551	int err;
 552
 553	err = pthread_attr_init(&attr);
 554	BUG_ON(err);
 555	err = pthread_attr_setstacksize(&attr,
 556			(size_t) max(16 * 1024, PTHREAD_STACK_MIN));
 557	BUG_ON(err);
 558	err = pthread_mutex_lock(&sched->start_work_mutex);
 559	BUG_ON(err);
 560	err = pthread_mutex_lock(&sched->work_done_wait_mutex);
 561	BUG_ON(err);
 562	for (i = 0; i < sched->nr_tasks; i++) {
 563		struct sched_thread_parms *parms = malloc(sizeof(*parms));
 564		BUG_ON(parms == NULL);
 565		parms->task = task = sched->tasks[i];
 566		parms->sched = sched;
 567		parms->fd = self_open_counters(sched, i);
 568		sem_init(&task->sleep_sem, 0, 0);
 569		sem_init(&task->ready_for_work, 0, 0);
 570		sem_init(&task->work_done_sem, 0, 0);
 571		task->curr_event = 0;
 572		err = pthread_create(&task->thread, &attr, thread_func, parms);
 573		BUG_ON(err);
 574	}
 575}
 576
 577static void wait_for_tasks(struct perf_sched *sched)
 578{
 579	u64 cpu_usage_0, cpu_usage_1;
 580	struct task_desc *task;
 581	unsigned long i, ret;
 582
 583	sched->start_time = get_nsecs();
 584	sched->cpu_usage = 0;
 585	pthread_mutex_unlock(&sched->work_done_wait_mutex);
 586
 587	for (i = 0; i < sched->nr_tasks; i++) {
 588		task = sched->tasks[i];
 589		ret = sem_wait(&task->ready_for_work);
 590		BUG_ON(ret);
 591		sem_init(&task->ready_for_work, 0, 0);
 592	}
 593	ret = pthread_mutex_lock(&sched->work_done_wait_mutex);
 594	BUG_ON(ret);
 595
 596	cpu_usage_0 = get_cpu_usage_nsec_parent();
 597
 598	pthread_mutex_unlock(&sched->start_work_mutex);
 599
 600	for (i = 0; i < sched->nr_tasks; i++) {
 601		task = sched->tasks[i];
 602		ret = sem_wait(&task->work_done_sem);
 603		BUG_ON(ret);
 604		sem_init(&task->work_done_sem, 0, 0);
 605		sched->cpu_usage += task->cpu_usage;
 606		task->cpu_usage = 0;
 607	}
 608
 609	cpu_usage_1 = get_cpu_usage_nsec_parent();
 610	if (!sched->runavg_cpu_usage)
 611		sched->runavg_cpu_usage = sched->cpu_usage;
 612	sched->runavg_cpu_usage = (sched->runavg_cpu_usage * (sched->replay_repeat - 1) + sched->cpu_usage) / sched->replay_repeat;
 613
 614	sched->parent_cpu_usage = cpu_usage_1 - cpu_usage_0;
 615	if (!sched->runavg_parent_cpu_usage)
 616		sched->runavg_parent_cpu_usage = sched->parent_cpu_usage;
 617	sched->runavg_parent_cpu_usage = (sched->runavg_parent_cpu_usage * (sched->replay_repeat - 1) +
 618					 sched->parent_cpu_usage)/sched->replay_repeat;
 619
 620	ret = pthread_mutex_lock(&sched->start_work_mutex);
 621	BUG_ON(ret);
 622
 623	for (i = 0; i < sched->nr_tasks; i++) {
 624		task = sched->tasks[i];
 625		sem_init(&task->sleep_sem, 0, 0);
 626		task->curr_event = 0;
 627	}
 628}
 629
 630static void run_one_test(struct perf_sched *sched)
 631{
 632	u64 T0, T1, delta, avg_delta, fluct;
 633
 634	T0 = get_nsecs();
 635	wait_for_tasks(sched);
 636	T1 = get_nsecs();
 637
 638	delta = T1 - T0;
 639	sched->sum_runtime += delta;
 640	sched->nr_runs++;
 641
 642	avg_delta = sched->sum_runtime / sched->nr_runs;
 643	if (delta < avg_delta)
 644		fluct = avg_delta - delta;
 645	else
 646		fluct = delta - avg_delta;
 647	sched->sum_fluct += fluct;
 648	if (!sched->run_avg)
 649		sched->run_avg = delta;
 650	sched->run_avg = (sched->run_avg * (sched->replay_repeat - 1) + delta) / sched->replay_repeat;
 651
 652	printf("#%-3ld: %0.3f, ", sched->nr_runs, (double)delta / 1000000.0);
 653
 654	printf("ravg: %0.2f, ", (double)sched->run_avg / 1e6);
 655
 656	printf("cpu: %0.2f / %0.2f",
 657		(double)sched->cpu_usage / 1e6, (double)sched->runavg_cpu_usage / 1e6);
 658
 659#if 0
 660	/*
 661	 * rusage statistics done by the parent, these are less
 662	 * accurate than the sched->sum_exec_runtime based statistics:
 663	 */
 664	printf(" [%0.2f / %0.2f]",
 665		(double)sched->parent_cpu_usage/1e6,
 666		(double)sched->runavg_parent_cpu_usage/1e6);
 667#endif
 668
 669	printf("\n");
 670
 671	if (sched->nr_sleep_corrections)
 672		printf(" (%ld sleep corrections)\n", sched->nr_sleep_corrections);
 673	sched->nr_sleep_corrections = 0;
 674}
 675
 676static void test_calibrations(struct perf_sched *sched)
 677{
 678	u64 T0, T1;
 679
 680	T0 = get_nsecs();
 681	burn_nsecs(sched, 1e6);
 682	T1 = get_nsecs();
 683
 684	printf("the run test took %" PRIu64 " nsecs\n", T1 - T0);
 685
 686	T0 = get_nsecs();
 687	sleep_nsecs(1e6);
 688	T1 = get_nsecs();
 689
 690	printf("the sleep test took %" PRIu64 " nsecs\n", T1 - T0);
 691}
 692
 693static int
 694replay_wakeup_event(struct perf_sched *sched,
 695		    struct perf_evsel *evsel, struct perf_sample *sample,
 696		    struct machine *machine __maybe_unused)
 697{
 698	const char *comm = perf_evsel__strval(evsel, sample, "comm");
 699	const u32 pid	 = perf_evsel__intval(evsel, sample, "pid");
 700	struct task_desc *waker, *wakee;
 701
 702	if (verbose) {
 703		printf("sched_wakeup event %p\n", evsel);
 704
 705		printf(" ... pid %d woke up %s/%d\n", sample->tid, comm, pid);
 706	}
 707
 708	waker = register_pid(sched, sample->tid, "<unknown>");
 709	wakee = register_pid(sched, pid, comm);
 710
 711	add_sched_event_wakeup(sched, waker, sample->time, wakee);
 712	return 0;
 713}
 714
 715static int replay_switch_event(struct perf_sched *sched,
 716			       struct perf_evsel *evsel,
 717			       struct perf_sample *sample,
 718			       struct machine *machine __maybe_unused)
 719{
 720	const char *prev_comm  = perf_evsel__strval(evsel, sample, "prev_comm"),
 721		   *next_comm  = perf_evsel__strval(evsel, sample, "next_comm");
 722	const u32 prev_pid = perf_evsel__intval(evsel, sample, "prev_pid"),
 723		  next_pid = perf_evsel__intval(evsel, sample, "next_pid");
 724	const u64 prev_state = perf_evsel__intval(evsel, sample, "prev_state");
 725	struct task_desc *prev, __maybe_unused *next;
 726	u64 timestamp0, timestamp = sample->time;
 727	int cpu = sample->cpu;
 728	s64 delta;
 729
 730	if (verbose)
 731		printf("sched_switch event %p\n", evsel);
 732
 733	if (cpu >= MAX_CPUS || cpu < 0)
 734		return 0;
 735
 736	timestamp0 = sched->cpu_last_switched[cpu];
 737	if (timestamp0)
 738		delta = timestamp - timestamp0;
 739	else
 740		delta = 0;
 741
 742	if (delta < 0) {
 743		pr_err("hm, delta: %" PRIu64 " < 0 ?\n", delta);
 744		return -1;
 745	}
 746
 747	pr_debug(" ... switch from %s/%d to %s/%d [ran %" PRIu64 " nsecs]\n",
 748		 prev_comm, prev_pid, next_comm, next_pid, delta);
 749
 750	prev = register_pid(sched, prev_pid, prev_comm);
 751	next = register_pid(sched, next_pid, next_comm);
 752
 753	sched->cpu_last_switched[cpu] = timestamp;
 754
 755	add_sched_event_run(sched, prev, timestamp, delta);
 756	add_sched_event_sleep(sched, prev, timestamp, prev_state);
 757
 758	return 0;
 759}
 760
 761static int replay_fork_event(struct perf_sched *sched,
 762			     union perf_event *event,
 763			     struct machine *machine)
 764{
 765	struct thread *child, *parent;
 766
 767	child = machine__findnew_thread(machine, event->fork.pid,
 768					event->fork.tid);
 769	parent = machine__findnew_thread(machine, event->fork.ppid,
 770					 event->fork.ptid);
 771
 772	if (child == NULL || parent == NULL) {
 773		pr_debug("thread does not exist on fork event: child %p, parent %p\n",
 774				 child, parent);
 775		goto out_put;
 776	}
 777
 778	if (verbose) {
 779		printf("fork event\n");
 780		printf("... parent: %s/%d\n", thread__comm_str(parent), parent->tid);
 781		printf("...  child: %s/%d\n", thread__comm_str(child), child->tid);
 782	}
 783
 784	register_pid(sched, parent->tid, thread__comm_str(parent));
 785	register_pid(sched, child->tid, thread__comm_str(child));
 786out_put:
 787	thread__put(child);
 788	thread__put(parent);
 789	return 0;
 790}
 791
 792struct sort_dimension {
 793	const char		*name;
 794	sort_fn_t		cmp;
 795	struct list_head	list;
 796};
 797
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 798static int
 799thread_lat_cmp(struct list_head *list, struct work_atoms *l, struct work_atoms *r)
 800{
 801	struct sort_dimension *sort;
 802	int ret = 0;
 803
 804	BUG_ON(list_empty(list));
 805
 806	list_for_each_entry(sort, list, list) {
 807		ret = sort->cmp(l, r);
 808		if (ret)
 809			return ret;
 810	}
 811
 812	return ret;
 813}
 814
 815static struct work_atoms *
 816thread_atoms_search(struct rb_root *root, struct thread *thread,
 817			 struct list_head *sort_list)
 818{
 819	struct rb_node *node = root->rb_node;
 820	struct work_atoms key = { .thread = thread };
 821
 822	while (node) {
 823		struct work_atoms *atoms;
 824		int cmp;
 825
 826		atoms = container_of(node, struct work_atoms, node);
 827
 828		cmp = thread_lat_cmp(sort_list, &key, atoms);
 829		if (cmp > 0)
 830			node = node->rb_left;
 831		else if (cmp < 0)
 832			node = node->rb_right;
 833		else {
 834			BUG_ON(thread != atoms->thread);
 835			return atoms;
 836		}
 837	}
 838	return NULL;
 839}
 840
 841static void
 842__thread_latency_insert(struct rb_root *root, struct work_atoms *data,
 843			 struct list_head *sort_list)
 844{
 845	struct rb_node **new = &(root->rb_node), *parent = NULL;
 
 846
 847	while (*new) {
 848		struct work_atoms *this;
 849		int cmp;
 850
 851		this = container_of(*new, struct work_atoms, node);
 852		parent = *new;
 853
 854		cmp = thread_lat_cmp(sort_list, data, this);
 855
 856		if (cmp > 0)
 857			new = &((*new)->rb_left);
 858		else
 859			new = &((*new)->rb_right);
 
 
 860	}
 861
 862	rb_link_node(&data->node, parent, new);
 863	rb_insert_color(&data->node, root);
 864}
 865
 866static int thread_atoms_insert(struct perf_sched *sched, struct thread *thread)
 867{
 868	struct work_atoms *atoms = zalloc(sizeof(*atoms));
 869	if (!atoms) {
 870		pr_err("No memory at %s\n", __func__);
 871		return -1;
 872	}
 873
 874	atoms->thread = thread__get(thread);
 875	INIT_LIST_HEAD(&atoms->work_list);
 876	__thread_latency_insert(&sched->atom_root, atoms, &sched->cmp_pid);
 877	return 0;
 878}
 879
 880static char sched_out_state(u64 prev_state)
 881{
 882	const char *str = TASK_STATE_TO_CHAR_STR;
 883
 884	return str[prev_state];
 885}
 886
 887static int
 888add_sched_out_event(struct work_atoms *atoms,
 889		    char run_state,
 890		    u64 timestamp)
 891{
 892	struct work_atom *atom = zalloc(sizeof(*atom));
 893	if (!atom) {
 894		pr_err("Non memory at %s", __func__);
 895		return -1;
 896	}
 897
 898	atom->sched_out_time = timestamp;
 899
 900	if (run_state == 'R') {
 901		atom->state = THREAD_WAIT_CPU;
 902		atom->wake_up_time = atom->sched_out_time;
 903	}
 904
 905	list_add_tail(&atom->list, &atoms->work_list);
 906	return 0;
 907}
 908
 909static void
 910add_runtime_event(struct work_atoms *atoms, u64 delta,
 911		  u64 timestamp __maybe_unused)
 912{
 913	struct work_atom *atom;
 914
 915	BUG_ON(list_empty(&atoms->work_list));
 916
 917	atom = list_entry(atoms->work_list.prev, struct work_atom, list);
 918
 919	atom->runtime += delta;
 920	atoms->total_runtime += delta;
 921}
 922
 923static void
 924add_sched_in_event(struct work_atoms *atoms, u64 timestamp)
 925{
 926	struct work_atom *atom;
 927	u64 delta;
 928
 929	if (list_empty(&atoms->work_list))
 930		return;
 931
 932	atom = list_entry(atoms->work_list.prev, struct work_atom, list);
 933
 934	if (atom->state != THREAD_WAIT_CPU)
 935		return;
 936
 937	if (timestamp < atom->wake_up_time) {
 938		atom->state = THREAD_IGNORE;
 939		return;
 940	}
 941
 942	atom->state = THREAD_SCHED_IN;
 943	atom->sched_in_time = timestamp;
 944
 945	delta = atom->sched_in_time - atom->wake_up_time;
 946	atoms->total_lat += delta;
 947	if (delta > atoms->max_lat) {
 948		atoms->max_lat = delta;
 949		atoms->max_lat_at = timestamp;
 950	}
 951	atoms->nb_atoms++;
 952}
 953
 954static int latency_switch_event(struct perf_sched *sched,
 955				struct perf_evsel *evsel,
 956				struct perf_sample *sample,
 957				struct machine *machine)
 958{
 959	const u32 prev_pid = perf_evsel__intval(evsel, sample, "prev_pid"),
 960		  next_pid = perf_evsel__intval(evsel, sample, "next_pid");
 961	const u64 prev_state = perf_evsel__intval(evsel, sample, "prev_state");
 962	struct work_atoms *out_events, *in_events;
 963	struct thread *sched_out, *sched_in;
 964	u64 timestamp0, timestamp = sample->time;
 965	int cpu = sample->cpu, err = -1;
 966	s64 delta;
 967
 968	BUG_ON(cpu >= MAX_CPUS || cpu < 0);
 969
 970	timestamp0 = sched->cpu_last_switched[cpu];
 971	sched->cpu_last_switched[cpu] = timestamp;
 972	if (timestamp0)
 973		delta = timestamp - timestamp0;
 974	else
 975		delta = 0;
 976
 977	if (delta < 0) {
 978		pr_err("hm, delta: %" PRIu64 " < 0 ?\n", delta);
 979		return -1;
 980	}
 981
 982	sched_out = machine__findnew_thread(machine, -1, prev_pid);
 983	sched_in = machine__findnew_thread(machine, -1, next_pid);
 984	if (sched_out == NULL || sched_in == NULL)
 985		goto out_put;
 986
 987	out_events = thread_atoms_search(&sched->atom_root, sched_out, &sched->cmp_pid);
 988	if (!out_events) {
 989		if (thread_atoms_insert(sched, sched_out))
 990			goto out_put;
 991		out_events = thread_atoms_search(&sched->atom_root, sched_out, &sched->cmp_pid);
 992		if (!out_events) {
 993			pr_err("out-event: Internal tree error");
 994			goto out_put;
 995		}
 996	}
 997	if (add_sched_out_event(out_events, sched_out_state(prev_state), timestamp))
 998		return -1;
 999
1000	in_events = thread_atoms_search(&sched->atom_root, sched_in, &sched->cmp_pid);
1001	if (!in_events) {
1002		if (thread_atoms_insert(sched, sched_in))
1003			goto out_put;
1004		in_events = thread_atoms_search(&sched->atom_root, sched_in, &sched->cmp_pid);
1005		if (!in_events) {
1006			pr_err("in-event: Internal tree error");
1007			goto out_put;
1008		}
1009		/*
1010		 * Take came in we have not heard about yet,
1011		 * add in an initial atom in runnable state:
1012		 */
1013		if (add_sched_out_event(in_events, 'R', timestamp))
1014			goto out_put;
1015	}
1016	add_sched_in_event(in_events, timestamp);
1017	err = 0;
1018out_put:
1019	thread__put(sched_out);
1020	thread__put(sched_in);
1021	return err;
1022}
1023
1024static int latency_runtime_event(struct perf_sched *sched,
1025				 struct perf_evsel *evsel,
1026				 struct perf_sample *sample,
1027				 struct machine *machine)
1028{
1029	const u32 pid	   = perf_evsel__intval(evsel, sample, "pid");
1030	const u64 runtime  = perf_evsel__intval(evsel, sample, "runtime");
1031	struct thread *thread = machine__findnew_thread(machine, -1, pid);
1032	struct work_atoms *atoms = thread_atoms_search(&sched->atom_root, thread, &sched->cmp_pid);
1033	u64 timestamp = sample->time;
1034	int cpu = sample->cpu, err = -1;
1035
1036	if (thread == NULL)
1037		return -1;
1038
1039	BUG_ON(cpu >= MAX_CPUS || cpu < 0);
1040	if (!atoms) {
1041		if (thread_atoms_insert(sched, thread))
1042			goto out_put;
1043		atoms = thread_atoms_search(&sched->atom_root, thread, &sched->cmp_pid);
1044		if (!atoms) {
1045			pr_err("in-event: Internal tree error");
1046			goto out_put;
1047		}
1048		if (add_sched_out_event(atoms, 'R', timestamp))
1049			goto out_put;
1050	}
1051
1052	add_runtime_event(atoms, runtime, timestamp);
1053	err = 0;
1054out_put:
1055	thread__put(thread);
1056	return err;
1057}
1058
1059static int latency_wakeup_event(struct perf_sched *sched,
1060				struct perf_evsel *evsel,
1061				struct perf_sample *sample,
1062				struct machine *machine)
1063{
1064	const u32 pid	  = perf_evsel__intval(evsel, sample, "pid");
1065	struct work_atoms *atoms;
1066	struct work_atom *atom;
1067	struct thread *wakee;
1068	u64 timestamp = sample->time;
1069	int err = -1;
1070
1071	wakee = machine__findnew_thread(machine, -1, pid);
1072	if (wakee == NULL)
1073		return -1;
1074	atoms = thread_atoms_search(&sched->atom_root, wakee, &sched->cmp_pid);
1075	if (!atoms) {
1076		if (thread_atoms_insert(sched, wakee))
1077			goto out_put;
1078		atoms = thread_atoms_search(&sched->atom_root, wakee, &sched->cmp_pid);
1079		if (!atoms) {
1080			pr_err("wakeup-event: Internal tree error");
1081			goto out_put;
1082		}
1083		if (add_sched_out_event(atoms, 'S', timestamp))
1084			goto out_put;
1085	}
1086
1087	BUG_ON(list_empty(&atoms->work_list));
1088
1089	atom = list_entry(atoms->work_list.prev, struct work_atom, list);
1090
1091	/*
1092	 * As we do not guarantee the wakeup event happens when
1093	 * task is out of run queue, also may happen when task is
1094	 * on run queue and wakeup only change ->state to TASK_RUNNING,
1095	 * then we should not set the ->wake_up_time when wake up a
1096	 * task which is on run queue.
1097	 *
1098	 * You WILL be missing events if you've recorded only
1099	 * one CPU, or are only looking at only one, so don't
1100	 * skip in this case.
1101	 */
1102	if (sched->profile_cpu == -1 && atom->state != THREAD_SLEEPING)
1103		goto out_ok;
1104
1105	sched->nr_timestamps++;
1106	if (atom->sched_out_time > timestamp) {
1107		sched->nr_unordered_timestamps++;
1108		goto out_ok;
1109	}
1110
1111	atom->state = THREAD_WAIT_CPU;
1112	atom->wake_up_time = timestamp;
1113out_ok:
1114	err = 0;
1115out_put:
1116	thread__put(wakee);
1117	return err;
1118}
1119
1120static int latency_migrate_task_event(struct perf_sched *sched,
1121				      struct perf_evsel *evsel,
1122				      struct perf_sample *sample,
1123				      struct machine *machine)
1124{
1125	const u32 pid = perf_evsel__intval(evsel, sample, "pid");
1126	u64 timestamp = sample->time;
1127	struct work_atoms *atoms;
1128	struct work_atom *atom;
1129	struct thread *migrant;
1130	int err = -1;
1131
1132	/*
1133	 * Only need to worry about migration when profiling one CPU.
1134	 */
1135	if (sched->profile_cpu == -1)
1136		return 0;
1137
1138	migrant = machine__findnew_thread(machine, -1, pid);
1139	if (migrant == NULL)
1140		return -1;
1141	atoms = thread_atoms_search(&sched->atom_root, migrant, &sched->cmp_pid);
1142	if (!atoms) {
1143		if (thread_atoms_insert(sched, migrant))
1144			goto out_put;
1145		register_pid(sched, migrant->tid, thread__comm_str(migrant));
1146		atoms = thread_atoms_search(&sched->atom_root, migrant, &sched->cmp_pid);
1147		if (!atoms) {
1148			pr_err("migration-event: Internal tree error");
1149			goto out_put;
1150		}
1151		if (add_sched_out_event(atoms, 'R', timestamp))
1152			goto out_put;
1153	}
1154
1155	BUG_ON(list_empty(&atoms->work_list));
1156
1157	atom = list_entry(atoms->work_list.prev, struct work_atom, list);
1158	atom->sched_in_time = atom->sched_out_time = atom->wake_up_time = timestamp;
1159
1160	sched->nr_timestamps++;
1161
1162	if (atom->sched_out_time > timestamp)
1163		sched->nr_unordered_timestamps++;
1164	err = 0;
1165out_put:
1166	thread__put(migrant);
1167	return err;
1168}
1169
1170static void output_lat_thread(struct perf_sched *sched, struct work_atoms *work_list)
1171{
1172	int i;
1173	int ret;
1174	u64 avg;
 
1175
1176	if (!work_list->nb_atoms)
1177		return;
1178	/*
1179	 * Ignore idle threads:
1180	 */
1181	if (!strcmp(thread__comm_str(work_list->thread), "swapper"))
1182		return;
1183
1184	sched->all_runtime += work_list->total_runtime;
1185	sched->all_count   += work_list->nb_atoms;
1186
1187	if (work_list->num_merged > 1)
1188		ret = printf("  %s:(%d) ", thread__comm_str(work_list->thread), work_list->num_merged);
1189	else
1190		ret = printf("  %s:%d ", thread__comm_str(work_list->thread), work_list->thread->tid);
1191
1192	for (i = 0; i < 24 - ret; i++)
1193		printf(" ");
1194
1195	avg = work_list->total_lat / work_list->nb_atoms;
 
1196
1197	printf("|%11.3f ms |%9" PRIu64 " | avg:%9.3f ms | max:%9.3f ms | max at: %13.6f s\n",
1198	      (double)work_list->total_runtime / 1e6,
1199		 work_list->nb_atoms, (double)avg / 1e6,
1200		 (double)work_list->max_lat / 1e6,
1201		 (double)work_list->max_lat_at / 1e9);
1202}
1203
1204static int pid_cmp(struct work_atoms *l, struct work_atoms *r)
1205{
1206	if (l->thread == r->thread)
1207		return 0;
1208	if (l->thread->tid < r->thread->tid)
1209		return -1;
1210	if (l->thread->tid > r->thread->tid)
1211		return 1;
1212	return (int)(l->thread - r->thread);
1213}
1214
1215static int avg_cmp(struct work_atoms *l, struct work_atoms *r)
1216{
1217	u64 avgl, avgr;
1218
1219	if (!l->nb_atoms)
1220		return -1;
1221
1222	if (!r->nb_atoms)
1223		return 1;
1224
1225	avgl = l->total_lat / l->nb_atoms;
1226	avgr = r->total_lat / r->nb_atoms;
1227
1228	if (avgl < avgr)
1229		return -1;
1230	if (avgl > avgr)
1231		return 1;
1232
1233	return 0;
1234}
1235
1236static int max_cmp(struct work_atoms *l, struct work_atoms *r)
1237{
1238	if (l->max_lat < r->max_lat)
1239		return -1;
1240	if (l->max_lat > r->max_lat)
1241		return 1;
1242
1243	return 0;
1244}
1245
1246static int switch_cmp(struct work_atoms *l, struct work_atoms *r)
1247{
1248	if (l->nb_atoms < r->nb_atoms)
1249		return -1;
1250	if (l->nb_atoms > r->nb_atoms)
1251		return 1;
1252
1253	return 0;
1254}
1255
1256static int runtime_cmp(struct work_atoms *l, struct work_atoms *r)
1257{
1258	if (l->total_runtime < r->total_runtime)
1259		return -1;
1260	if (l->total_runtime > r->total_runtime)
1261		return 1;
1262
1263	return 0;
1264}
1265
1266static int sort_dimension__add(const char *tok, struct list_head *list)
1267{
1268	size_t i;
1269	static struct sort_dimension avg_sort_dimension = {
1270		.name = "avg",
1271		.cmp  = avg_cmp,
1272	};
1273	static struct sort_dimension max_sort_dimension = {
1274		.name = "max",
1275		.cmp  = max_cmp,
1276	};
1277	static struct sort_dimension pid_sort_dimension = {
1278		.name = "pid",
1279		.cmp  = pid_cmp,
1280	};
1281	static struct sort_dimension runtime_sort_dimension = {
1282		.name = "runtime",
1283		.cmp  = runtime_cmp,
1284	};
1285	static struct sort_dimension switch_sort_dimension = {
1286		.name = "switch",
1287		.cmp  = switch_cmp,
1288	};
1289	struct sort_dimension *available_sorts[] = {
1290		&pid_sort_dimension,
1291		&avg_sort_dimension,
1292		&max_sort_dimension,
1293		&switch_sort_dimension,
1294		&runtime_sort_dimension,
1295	};
1296
1297	for (i = 0; i < ARRAY_SIZE(available_sorts); i++) {
1298		if (!strcmp(available_sorts[i]->name, tok)) {
1299			list_add_tail(&available_sorts[i]->list, list);
1300
1301			return 0;
1302		}
1303	}
1304
1305	return -1;
1306}
1307
1308static void perf_sched__sort_lat(struct perf_sched *sched)
1309{
1310	struct rb_node *node;
1311	struct rb_root *root = &sched->atom_root;
1312again:
1313	for (;;) {
1314		struct work_atoms *data;
1315		node = rb_first(root);
1316		if (!node)
1317			break;
1318
1319		rb_erase(node, root);
1320		data = rb_entry(node, struct work_atoms, node);
1321		__thread_latency_insert(&sched->sorted_atom_root, data, &sched->sort_list);
1322	}
1323	if (root == &sched->atom_root) {
1324		root = &sched->merged_atom_root;
1325		goto again;
1326	}
1327}
1328
1329static int process_sched_wakeup_event(struct perf_tool *tool,
1330				      struct perf_evsel *evsel,
1331				      struct perf_sample *sample,
1332				      struct machine *machine)
1333{
1334	struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
1335
1336	if (sched->tp_handler->wakeup_event)
1337		return sched->tp_handler->wakeup_event(sched, evsel, sample, machine);
1338
1339	return 0;
1340}
1341
1342static int map_switch_event(struct perf_sched *sched, struct perf_evsel *evsel,
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1343			    struct perf_sample *sample, struct machine *machine)
1344{
1345	const u32 next_pid = perf_evsel__intval(evsel, sample, "next_pid");
1346	struct thread *sched_in;
 
1347	int new_shortname;
1348	u64 timestamp0, timestamp = sample->time;
1349	s64 delta;
1350	int cpu, this_cpu = sample->cpu;
 
 
 
 
1351
1352	BUG_ON(this_cpu >= MAX_CPUS || this_cpu < 0);
1353
1354	if (this_cpu > sched->max_cpu)
1355		sched->max_cpu = this_cpu;
1356
 
 
 
 
 
 
 
 
 
1357	timestamp0 = sched->cpu_last_switched[this_cpu];
1358	sched->cpu_last_switched[this_cpu] = timestamp;
1359	if (timestamp0)
1360		delta = timestamp - timestamp0;
1361	else
1362		delta = 0;
1363
1364	if (delta < 0) {
1365		pr_err("hm, delta: %" PRIu64 " < 0 ?\n", delta);
1366		return -1;
1367	}
1368
1369	sched_in = machine__findnew_thread(machine, -1, next_pid);
1370	if (sched_in == NULL)
1371		return -1;
1372
 
 
 
 
 
 
1373	sched->curr_thread[this_cpu] = thread__get(sched_in);
1374
1375	printf("  ");
1376
1377	new_shortname = 0;
1378	if (!sched_in->shortname[0]) {
1379		if (!strcmp(thread__comm_str(sched_in), "swapper")) {
1380			/*
1381			 * Don't allocate a letter-number for swapper:0
1382			 * as a shortname. Instead, we use '.' for it.
1383			 */
1384			sched_in->shortname[0] = '.';
1385			sched_in->shortname[1] = ' ';
1386		} else {
1387			sched_in->shortname[0] = sched->next_shortname1;
1388			sched_in->shortname[1] = sched->next_shortname2;
1389
1390			if (sched->next_shortname1 < 'Z') {
1391				sched->next_shortname1++;
1392			} else {
1393				sched->next_shortname1 = 'A';
1394				if (sched->next_shortname2 < '9')
1395					sched->next_shortname2++;
1396				else
1397					sched->next_shortname2 = '0';
1398			}
1399		}
1400		new_shortname = 1;
1401	}
1402
1403	for (cpu = 0; cpu <= sched->max_cpu; cpu++) {
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1404		if (cpu != this_cpu)
1405			printf(" ");
1406		else
1407			printf("*");
1408
1409		if (sched->curr_thread[cpu])
1410			printf("%2s ", sched->curr_thread[cpu]->shortname);
1411		else
1412			printf("   ");
 
 
 
 
 
1413	}
1414
1415	printf("  %12.6f secs ", (double)timestamp/1e9);
1416	if (new_shortname) {
1417		printf("%s => %s:%d\n",
1418		       sched_in->shortname, thread__comm_str(sched_in), sched_in->tid);
1419	} else {
1420		printf("\n");
 
 
 
 
 
 
 
 
1421	}
1422
 
 
 
 
 
 
1423	thread__put(sched_in);
1424
1425	return 0;
1426}
1427
1428static int process_sched_switch_event(struct perf_tool *tool,
1429				      struct perf_evsel *evsel,
1430				      struct perf_sample *sample,
1431				      struct machine *machine)
1432{
1433	struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
1434	int this_cpu = sample->cpu, err = 0;
1435	u32 prev_pid = perf_evsel__intval(evsel, sample, "prev_pid"),
1436	    next_pid = perf_evsel__intval(evsel, sample, "next_pid");
1437
1438	if (sched->curr_pid[this_cpu] != (u32)-1) {
1439		/*
1440		 * Are we trying to switch away a PID that is
1441		 * not current?
1442		 */
1443		if (sched->curr_pid[this_cpu] != prev_pid)
1444			sched->nr_context_switch_bugs++;
1445	}
1446
1447	if (sched->tp_handler->switch_event)
1448		err = sched->tp_handler->switch_event(sched, evsel, sample, machine);
1449
1450	sched->curr_pid[this_cpu] = next_pid;
1451	return err;
1452}
1453
1454static int process_sched_runtime_event(struct perf_tool *tool,
1455				       struct perf_evsel *evsel,
1456				       struct perf_sample *sample,
1457				       struct machine *machine)
1458{
1459	struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
1460
1461	if (sched->tp_handler->runtime_event)
1462		return sched->tp_handler->runtime_event(sched, evsel, sample, machine);
1463
1464	return 0;
1465}
1466
1467static int perf_sched__process_fork_event(struct perf_tool *tool,
1468					  union perf_event *event,
1469					  struct perf_sample *sample,
1470					  struct machine *machine)
1471{
1472	struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
1473
1474	/* run the fork event through the perf machineruy */
1475	perf_event__process_fork(tool, event, sample, machine);
1476
1477	/* and then run additional processing needed for this command */
1478	if (sched->tp_handler->fork_event)
1479		return sched->tp_handler->fork_event(sched, event, machine);
1480
1481	return 0;
1482}
1483
1484static int process_sched_migrate_task_event(struct perf_tool *tool,
1485					    struct perf_evsel *evsel,
1486					    struct perf_sample *sample,
1487					    struct machine *machine)
1488{
1489	struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
1490
1491	if (sched->tp_handler->migrate_task_event)
1492		return sched->tp_handler->migrate_task_event(sched, evsel, sample, machine);
1493
1494	return 0;
1495}
1496
1497typedef int (*tracepoint_handler)(struct perf_tool *tool,
1498				  struct perf_evsel *evsel,
1499				  struct perf_sample *sample,
1500				  struct machine *machine);
1501
1502static int perf_sched__process_tracepoint_sample(struct perf_tool *tool __maybe_unused,
1503						 union perf_event *event __maybe_unused,
1504						 struct perf_sample *sample,
1505						 struct perf_evsel *evsel,
1506						 struct machine *machine)
1507{
1508	int err = 0;
1509
1510	if (evsel->handler != NULL) {
1511		tracepoint_handler f = evsel->handler;
1512		err = f(tool, evsel, sample, machine);
1513	}
1514
1515	return err;
1516}
1517
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1518static int perf_sched__read_events(struct perf_sched *sched)
1519{
1520	const struct perf_evsel_str_handler handlers[] = {
1521		{ "sched:sched_switch",	      process_sched_switch_event, },
1522		{ "sched:sched_stat_runtime", process_sched_runtime_event, },
1523		{ "sched:sched_wakeup",	      process_sched_wakeup_event, },
1524		{ "sched:sched_wakeup_new",   process_sched_wakeup_event, },
1525		{ "sched:sched_migrate_task", process_sched_migrate_task_event, },
1526	};
1527	struct perf_session *session;
1528	struct perf_data_file file = {
1529		.path = input_name,
1530		.mode = PERF_DATA_MODE_READ,
1531		.force = sched->force,
1532	};
1533	int rc = -1;
1534
1535	session = perf_session__new(&file, false, &sched->tool);
1536	if (session == NULL) {
1537		pr_debug("No Memory for session\n");
1538		return -1;
1539	}
1540
1541	symbol__init(&session->header.env);
1542
1543	if (perf_session__set_tracepoints_handlers(session, handlers))
1544		goto out_delete;
1545
1546	if (perf_session__has_traces(session, "record -R")) {
1547		int err = perf_session__process_events(session);
1548		if (err) {
1549			pr_err("Failed to process events, error %d", err);
1550			goto out_delete;
1551		}
1552
1553		sched->nr_events      = session->evlist->stats.nr_events[0];
1554		sched->nr_lost_events = session->evlist->stats.total_lost;
1555		sched->nr_lost_chunks = session->evlist->stats.nr_events[PERF_RECORD_LOST];
1556	}
1557
1558	rc = 0;
1559out_delete:
1560	perf_session__delete(session);
1561	return rc;
1562}
1563
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1564static void print_bad_events(struct perf_sched *sched)
1565{
1566	if (sched->nr_unordered_timestamps && sched->nr_timestamps) {
1567		printf("  INFO: %.3f%% unordered timestamps (%ld out of %ld)\n",
1568			(double)sched->nr_unordered_timestamps/(double)sched->nr_timestamps*100.0,
1569			sched->nr_unordered_timestamps, sched->nr_timestamps);
1570	}
1571	if (sched->nr_lost_events && sched->nr_events) {
1572		printf("  INFO: %.3f%% lost events (%ld out of %ld, in %ld chunks)\n",
1573			(double)sched->nr_lost_events/(double)sched->nr_events * 100.0,
1574			sched->nr_lost_events, sched->nr_events, sched->nr_lost_chunks);
1575	}
1576	if (sched->nr_context_switch_bugs && sched->nr_timestamps) {
1577		printf("  INFO: %.3f%% context switch bugs (%ld out of %ld)",
1578			(double)sched->nr_context_switch_bugs/(double)sched->nr_timestamps*100.0,
1579			sched->nr_context_switch_bugs, sched->nr_timestamps);
1580		if (sched->nr_lost_events)
1581			printf(" (due to lost events?)");
1582		printf("\n");
1583	}
1584}
1585
1586static void __merge_work_atoms(struct rb_root *root, struct work_atoms *data)
1587{
1588	struct rb_node **new = &(root->rb_node), *parent = NULL;
1589	struct work_atoms *this;
1590	const char *comm = thread__comm_str(data->thread), *this_comm;
 
1591
1592	while (*new) {
1593		int cmp;
1594
1595		this = container_of(*new, struct work_atoms, node);
1596		parent = *new;
1597
1598		this_comm = thread__comm_str(this->thread);
1599		cmp = strcmp(comm, this_comm);
1600		if (cmp > 0) {
1601			new = &((*new)->rb_left);
1602		} else if (cmp < 0) {
1603			new = &((*new)->rb_right);
 
1604		} else {
1605			this->num_merged++;
1606			this->total_runtime += data->total_runtime;
1607			this->nb_atoms += data->nb_atoms;
1608			this->total_lat += data->total_lat;
1609			list_splice(&data->work_list, &this->work_list);
1610			if (this->max_lat < data->max_lat) {
1611				this->max_lat = data->max_lat;
1612				this->max_lat_at = data->max_lat_at;
1613			}
1614			zfree(&data);
1615			return;
1616		}
1617	}
1618
1619	data->num_merged++;
1620	rb_link_node(&data->node, parent, new);
1621	rb_insert_color(&data->node, root);
1622}
1623
1624static void perf_sched__merge_lat(struct perf_sched *sched)
1625{
1626	struct work_atoms *data;
1627	struct rb_node *node;
1628
1629	if (sched->skip_merge)
1630		return;
1631
1632	while ((node = rb_first(&sched->atom_root))) {
1633		rb_erase(node, &sched->atom_root);
1634		data = rb_entry(node, struct work_atoms, node);
1635		__merge_work_atoms(&sched->merged_atom_root, data);
1636	}
1637}
1638
1639static int perf_sched__lat(struct perf_sched *sched)
1640{
1641	struct rb_node *next;
1642
1643	setup_pager();
1644
1645	if (perf_sched__read_events(sched))
1646		return -1;
1647
1648	perf_sched__merge_lat(sched);
1649	perf_sched__sort_lat(sched);
1650
1651	printf("\n -----------------------------------------------------------------------------------------------------------------\n");
1652	printf("  Task                  |   Runtime ms  | Switches | Average delay ms | Maximum delay ms | Maximum delay at       |\n");
1653	printf(" -----------------------------------------------------------------------------------------------------------------\n");
1654
1655	next = rb_first(&sched->sorted_atom_root);
1656
1657	while (next) {
1658		struct work_atoms *work_list;
1659
1660		work_list = rb_entry(next, struct work_atoms, node);
1661		output_lat_thread(sched, work_list);
1662		next = rb_next(next);
1663		thread__zput(work_list->thread);
1664	}
1665
1666	printf(" -----------------------------------------------------------------------------------------------------------------\n");
1667	printf("  TOTAL:                |%11.3f ms |%9" PRIu64 " |\n",
1668		(double)sched->all_runtime / 1e6, sched->all_count);
1669
1670	printf(" ---------------------------------------------------\n");
1671
1672	print_bad_events(sched);
1673	printf("\n");
1674
1675	return 0;
1676}
1677
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1678static int perf_sched__map(struct perf_sched *sched)
1679{
1680	sched->max_cpu = sysconf(_SC_NPROCESSORS_CONF);
 
 
 
 
 
 
 
1681
1682	setup_pager();
1683	if (perf_sched__read_events(sched))
1684		return -1;
1685	print_bad_events(sched);
1686	return 0;
1687}
1688
1689static int perf_sched__replay(struct perf_sched *sched)
1690{
1691	unsigned long i;
1692
1693	calibrate_run_measurement_overhead(sched);
1694	calibrate_sleep_measurement_overhead(sched);
1695
1696	test_calibrations(sched);
1697
1698	if (perf_sched__read_events(sched))
1699		return -1;
1700
1701	printf("nr_run_events:        %ld\n", sched->nr_run_events);
1702	printf("nr_sleep_events:      %ld\n", sched->nr_sleep_events);
1703	printf("nr_wakeup_events:     %ld\n", sched->nr_wakeup_events);
1704
1705	if (sched->targetless_wakeups)
1706		printf("target-less wakeups:  %ld\n", sched->targetless_wakeups);
1707	if (sched->multitarget_wakeups)
1708		printf("multi-target wakeups: %ld\n", sched->multitarget_wakeups);
1709	if (sched->nr_run_events_optimized)
1710		printf("run atoms optimized: %ld\n",
1711			sched->nr_run_events_optimized);
1712
1713	print_task_traces(sched);
1714	add_cross_task_wakeups(sched);
1715
1716	create_tasks(sched);
1717	printf("------------------------------------------------------------\n");
1718	for (i = 0; i < sched->replay_repeat; i++)
1719		run_one_test(sched);
1720
1721	return 0;
1722}
1723
1724static void setup_sorting(struct perf_sched *sched, const struct option *options,
1725			  const char * const usage_msg[])
1726{
1727	char *tmp, *tok, *str = strdup(sched->sort_order);
1728
1729	for (tok = strtok_r(str, ", ", &tmp);
1730			tok; tok = strtok_r(NULL, ", ", &tmp)) {
1731		if (sort_dimension__add(tok, &sched->sort_list) < 0) {
1732			usage_with_options_msg(usage_msg, options,
1733					"Unknown --sort key: `%s'", tok);
1734		}
1735	}
1736
1737	free(str);
1738
1739	sort_dimension__add("pid", &sched->cmp_pid);
1740}
1741
1742static int __cmd_record(int argc, const char **argv)
1743{
1744	unsigned int rec_argc, i, j;
1745	const char **rec_argv;
1746	const char * const record_args[] = {
1747		"record",
1748		"-a",
1749		"-R",
1750		"-m", "1024",
1751		"-c", "1",
1752		"-e", "sched:sched_switch",
1753		"-e", "sched:sched_stat_wait",
1754		"-e", "sched:sched_stat_sleep",
1755		"-e", "sched:sched_stat_iowait",
1756		"-e", "sched:sched_stat_runtime",
1757		"-e", "sched:sched_process_fork",
1758		"-e", "sched:sched_wakeup",
1759		"-e", "sched:sched_wakeup_new",
1760		"-e", "sched:sched_migrate_task",
1761	};
 
1762
1763	rec_argc = ARRAY_SIZE(record_args) + argc - 1;
 
 
 
 
1764	rec_argv = calloc(rec_argc + 1, sizeof(char *));
1765
1766	if (rec_argv == NULL)
1767		return -ENOMEM;
1768
1769	for (i = 0; i < ARRAY_SIZE(record_args); i++)
1770		rec_argv[i] = strdup(record_args[i]);
1771
 
 
 
 
 
 
 
1772	for (j = 1; j < (unsigned int)argc; j++, i++)
1773		rec_argv[i] = argv[j];
1774
1775	BUG_ON(i != rec_argc);
1776
1777	return cmd_record(i, rec_argv, NULL);
1778}
1779
1780int cmd_sched(int argc, const char **argv, const char *prefix __maybe_unused)
1781{
1782	const char default_sort_order[] = "avg, max, switch, runtime";
1783	struct perf_sched sched = {
1784		.tool = {
1785			.sample		 = perf_sched__process_tracepoint_sample,
1786			.comm		 = perf_event__process_comm,
 
1787			.lost		 = perf_event__process_lost,
1788			.fork		 = perf_sched__process_fork_event,
1789			.ordered_events = true,
1790		},
1791		.cmp_pid	      = LIST_HEAD_INIT(sched.cmp_pid),
1792		.sort_list	      = LIST_HEAD_INIT(sched.sort_list),
1793		.start_work_mutex     = PTHREAD_MUTEX_INITIALIZER,
1794		.work_done_wait_mutex = PTHREAD_MUTEX_INITIALIZER,
1795		.sort_order	      = default_sort_order,
1796		.replay_repeat	      = 10,
1797		.profile_cpu	      = -1,
1798		.next_shortname1      = 'A',
1799		.next_shortname2      = '0',
1800		.skip_merge           = 0,
 
 
 
 
 
 
 
 
 
 
 
 
1801	};
1802	const struct option latency_options[] = {
1803	OPT_STRING('s', "sort", &sched.sort_order, "key[,key2...]",
1804		   "sort by key(s): runtime, switch, avg, max"),
1805	OPT_INCR('v', "verbose", &verbose,
1806		    "be more verbose (show symbol address, etc)"),
1807	OPT_INTEGER('C', "CPU", &sched.profile_cpu,
1808		    "CPU to profile on"),
1809	OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
1810		    "dump raw trace in ASCII"),
1811	OPT_BOOLEAN('p', "pids", &sched.skip_merge,
1812		    "latency stats per pid instead of per comm"),
1813	OPT_END()
1814	};
1815	const struct option replay_options[] = {
1816	OPT_UINTEGER('r', "repeat", &sched.replay_repeat,
1817		     "repeat the workload replay N times (-1: infinite)"),
1818	OPT_INCR('v', "verbose", &verbose,
1819		    "be more verbose (show symbol address, etc)"),
1820	OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
1821		    "dump raw trace in ASCII"),
1822	OPT_BOOLEAN('f', "force", &sched.force, "don't complain, do it"),
1823	OPT_END()
1824	};
1825	const struct option sched_options[] = {
1826	OPT_STRING('i', "input", &input_name, "file",
1827		    "input file name"),
1828	OPT_INCR('v', "verbose", &verbose,
1829		    "be more verbose (show symbol address, etc)"),
1830	OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
1831		    "dump raw trace in ASCII"),
1832	OPT_END()
 
 
1833	};
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1834	const char * const latency_usage[] = {
1835		"perf sched latency [<options>]",
1836		NULL
1837	};
1838	const char * const replay_usage[] = {
1839		"perf sched replay [<options>]",
1840		NULL
1841	};
 
 
 
 
 
 
 
 
1842	const char *const sched_subcommands[] = { "record", "latency", "map",
1843						  "replay", "script", NULL };
 
1844	const char *sched_usage[] = {
1845		NULL,
1846		NULL
1847	};
1848	struct trace_sched_handler lat_ops  = {
1849		.wakeup_event	    = latency_wakeup_event,
1850		.switch_event	    = latency_switch_event,
1851		.runtime_event	    = latency_runtime_event,
1852		.migrate_task_event = latency_migrate_task_event,
1853	};
1854	struct trace_sched_handler map_ops  = {
1855		.switch_event	    = map_switch_event,
1856	};
1857	struct trace_sched_handler replay_ops  = {
1858		.wakeup_event	    = replay_wakeup_event,
1859		.switch_event	    = replay_switch_event,
1860		.fork_event	    = replay_fork_event,
1861	};
1862	unsigned int i;
1863
1864	for (i = 0; i < ARRAY_SIZE(sched.curr_pid); i++)
1865		sched.curr_pid[i] = -1;
1866
1867	argc = parse_options_subcommand(argc, argv, sched_options, sched_subcommands,
1868					sched_usage, PARSE_OPT_STOP_AT_NON_OPTION);
1869	if (!argc)
1870		usage_with_options(sched_usage, sched_options);
1871
1872	/*
1873	 * Aliased to 'perf script' for now:
1874	 */
1875	if (!strcmp(argv[0], "script"))
1876		return cmd_script(argc, argv, prefix);
1877
1878	if (!strncmp(argv[0], "rec", 3)) {
1879		return __cmd_record(argc, argv);
1880	} else if (!strncmp(argv[0], "lat", 3)) {
1881		sched.tp_handler = &lat_ops;
1882		if (argc > 1) {
1883			argc = parse_options(argc, argv, latency_options, latency_usage, 0);
1884			if (argc)
1885				usage_with_options(latency_usage, latency_options);
1886		}
1887		setup_sorting(&sched, latency_options, latency_usage);
1888		return perf_sched__lat(&sched);
1889	} else if (!strcmp(argv[0], "map")) {
 
 
 
 
 
1890		sched.tp_handler = &map_ops;
1891		setup_sorting(&sched, latency_options, latency_usage);
1892		return perf_sched__map(&sched);
1893	} else if (!strncmp(argv[0], "rep", 3)) {
1894		sched.tp_handler = &replay_ops;
1895		if (argc) {
1896			argc = parse_options(argc, argv, replay_options, replay_usage, 0);
1897			if (argc)
1898				usage_with_options(replay_usage, replay_options);
1899		}
1900		return perf_sched__replay(&sched);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1901	} else {
1902		usage_with_options(sched_usage, sched_options);
1903	}
1904
1905	return 0;
1906}
v5.9
   1// SPDX-License-Identifier: GPL-2.0
   2#include "builtin.h"
   3#include "perf.h"
   4#include "perf-sys.h"
   5
   6#include "util/cpumap.h"
   7#include "util/evlist.h"
 
   8#include "util/evsel.h"
   9#include "util/evsel_fprintf.h"
  10#include "util/symbol.h"
  11#include "util/thread.h"
  12#include "util/header.h"
  13#include "util/session.h"
  14#include "util/tool.h"
  15#include "util/cloexec.h"
  16#include "util/thread_map.h"
  17#include "util/color.h"
  18#include "util/stat.h"
  19#include "util/string2.h"
  20#include "util/callchain.h"
  21#include "util/time-utils.h"
  22
  23#include <subcmd/pager.h>
  24#include <subcmd/parse-options.h>
  25#include "util/trace-event.h"
  26
  27#include "util/debug.h"
  28#include "util/event.h"
  29
  30#include <linux/kernel.h>
  31#include <linux/log2.h>
  32#include <linux/zalloc.h>
  33#include <sys/prctl.h>
  34#include <sys/resource.h>
  35#include <inttypes.h>
  36
  37#include <errno.h>
  38#include <semaphore.h>
  39#include <pthread.h>
  40#include <math.h>
  41#include <api/fs/fs.h>
  42#include <perf/cpumap.h>
  43#include <linux/time64.h>
  44#include <linux/err.h>
  45
  46#include <linux/ctype.h>
  47
  48#define PR_SET_NAME		15               /* Set process name */
  49#define MAX_CPUS		4096
  50#define COMM_LEN		20
  51#define SYM_LEN			129
  52#define MAX_PID			1024000
  53
  54static const char *cpu_list;
  55static DECLARE_BITMAP(cpu_bitmap, MAX_NR_CPUS);
  56
  57struct sched_atom;
  58
  59struct task_desc {
  60	unsigned long		nr;
  61	unsigned long		pid;
  62	char			comm[COMM_LEN];
  63
  64	unsigned long		nr_events;
  65	unsigned long		curr_event;
  66	struct sched_atom	**atoms;
  67
  68	pthread_t		thread;
  69	sem_t			sleep_sem;
  70
  71	sem_t			ready_for_work;
  72	sem_t			work_done_sem;
  73
  74	u64			cpu_usage;
  75};
  76
  77enum sched_event_type {
  78	SCHED_EVENT_RUN,
  79	SCHED_EVENT_SLEEP,
  80	SCHED_EVENT_WAKEUP,
  81	SCHED_EVENT_MIGRATION,
  82};
  83
  84struct sched_atom {
  85	enum sched_event_type	type;
  86	int			specific_wait;
  87	u64			timestamp;
  88	u64			duration;
  89	unsigned long		nr;
  90	sem_t			*wait_sem;
  91	struct task_desc	*wakee;
  92};
  93
  94#define TASK_STATE_TO_CHAR_STR "RSDTtZXxKWP"
  95
  96/* task state bitmask, copied from include/linux/sched.h */
  97#define TASK_RUNNING		0
  98#define TASK_INTERRUPTIBLE	1
  99#define TASK_UNINTERRUPTIBLE	2
 100#define __TASK_STOPPED		4
 101#define __TASK_TRACED		8
 102/* in tsk->exit_state */
 103#define EXIT_DEAD		16
 104#define EXIT_ZOMBIE		32
 105#define EXIT_TRACE		(EXIT_ZOMBIE | EXIT_DEAD)
 106/* in tsk->state again */
 107#define TASK_DEAD		64
 108#define TASK_WAKEKILL		128
 109#define TASK_WAKING		256
 110#define TASK_PARKED		512
 111
 112enum thread_state {
 113	THREAD_SLEEPING = 0,
 114	THREAD_WAIT_CPU,
 115	THREAD_SCHED_IN,
 116	THREAD_IGNORE
 117};
 118
 119struct work_atom {
 120	struct list_head	list;
 121	enum thread_state	state;
 122	u64			sched_out_time;
 123	u64			wake_up_time;
 124	u64			sched_in_time;
 125	u64			runtime;
 126};
 127
 128struct work_atoms {
 129	struct list_head	work_list;
 130	struct thread		*thread;
 131	struct rb_node		node;
 132	u64			max_lat;
 133	u64			max_lat_at;
 134	u64			total_lat;
 135	u64			nb_atoms;
 136	u64			total_runtime;
 137	int			num_merged;
 138};
 139
 140typedef int (*sort_fn_t)(struct work_atoms *, struct work_atoms *);
 141
 142struct perf_sched;
 143
 144struct trace_sched_handler {
 145	int (*switch_event)(struct perf_sched *sched, struct evsel *evsel,
 146			    struct perf_sample *sample, struct machine *machine);
 147
 148	int (*runtime_event)(struct perf_sched *sched, struct evsel *evsel,
 149			     struct perf_sample *sample, struct machine *machine);
 150
 151	int (*wakeup_event)(struct perf_sched *sched, struct evsel *evsel,
 152			    struct perf_sample *sample, struct machine *machine);
 153
 154	/* PERF_RECORD_FORK event, not sched_process_fork tracepoint */
 155	int (*fork_event)(struct perf_sched *sched, union perf_event *event,
 156			  struct machine *machine);
 157
 158	int (*migrate_task_event)(struct perf_sched *sched,
 159				  struct evsel *evsel,
 160				  struct perf_sample *sample,
 161				  struct machine *machine);
 162};
 163
 164#define COLOR_PIDS PERF_COLOR_BLUE
 165#define COLOR_CPUS PERF_COLOR_BG_RED
 166
 167struct perf_sched_map {
 168	DECLARE_BITMAP(comp_cpus_mask, MAX_CPUS);
 169	int			*comp_cpus;
 170	bool			 comp;
 171	struct perf_thread_map *color_pids;
 172	const char		*color_pids_str;
 173	struct perf_cpu_map	*color_cpus;
 174	const char		*color_cpus_str;
 175	struct perf_cpu_map	*cpus;
 176	const char		*cpus_str;
 177};
 178
 179struct perf_sched {
 180	struct perf_tool tool;
 181	const char	 *sort_order;
 182	unsigned long	 nr_tasks;
 183	struct task_desc **pid_to_task;
 184	struct task_desc **tasks;
 185	const struct trace_sched_handler *tp_handler;
 186	pthread_mutex_t	 start_work_mutex;
 187	pthread_mutex_t	 work_done_wait_mutex;
 188	int		 profile_cpu;
 189/*
 190 * Track the current task - that way we can know whether there's any
 191 * weird events, such as a task being switched away that is not current.
 192 */
 193	int		 max_cpu;
 194	u32		 curr_pid[MAX_CPUS];
 195	struct thread	 *curr_thread[MAX_CPUS];
 196	char		 next_shortname1;
 197	char		 next_shortname2;
 198	unsigned int	 replay_repeat;
 199	unsigned long	 nr_run_events;
 200	unsigned long	 nr_sleep_events;
 201	unsigned long	 nr_wakeup_events;
 202	unsigned long	 nr_sleep_corrections;
 203	unsigned long	 nr_run_events_optimized;
 204	unsigned long	 targetless_wakeups;
 205	unsigned long	 multitarget_wakeups;
 206	unsigned long	 nr_runs;
 207	unsigned long	 nr_timestamps;
 208	unsigned long	 nr_unordered_timestamps;
 209	unsigned long	 nr_context_switch_bugs;
 210	unsigned long	 nr_events;
 211	unsigned long	 nr_lost_chunks;
 212	unsigned long	 nr_lost_events;
 213	u64		 run_measurement_overhead;
 214	u64		 sleep_measurement_overhead;
 215	u64		 start_time;
 216	u64		 cpu_usage;
 217	u64		 runavg_cpu_usage;
 218	u64		 parent_cpu_usage;
 219	u64		 runavg_parent_cpu_usage;
 220	u64		 sum_runtime;
 221	u64		 sum_fluct;
 222	u64		 run_avg;
 223	u64		 all_runtime;
 224	u64		 all_count;
 225	u64		 cpu_last_switched[MAX_CPUS];
 226	struct rb_root_cached atom_root, sorted_atom_root, merged_atom_root;
 227	struct list_head sort_list, cmp_pid;
 228	bool force;
 229	bool skip_merge;
 230	struct perf_sched_map map;
 231
 232	/* options for timehist command */
 233	bool		summary;
 234	bool		summary_only;
 235	bool		idle_hist;
 236	bool		show_callchain;
 237	unsigned int	max_stack;
 238	bool		show_cpu_visual;
 239	bool		show_wakeups;
 240	bool		show_next;
 241	bool		show_migrations;
 242	bool		show_state;
 243	u64		skipped_samples;
 244	const char	*time_str;
 245	struct perf_time_interval ptime;
 246	struct perf_time_interval hist_time;
 247};
 248
 249/* per thread run time data */
 250struct thread_runtime {
 251	u64 last_time;      /* time of previous sched in/out event */
 252	u64 dt_run;         /* run time */
 253	u64 dt_sleep;       /* time between CPU access by sleep (off cpu) */
 254	u64 dt_iowait;      /* time between CPU access by iowait (off cpu) */
 255	u64 dt_preempt;     /* time between CPU access by preempt (off cpu) */
 256	u64 dt_delay;       /* time between wakeup and sched-in */
 257	u64 ready_to_run;   /* time of wakeup */
 258
 259	struct stats run_stats;
 260	u64 total_run_time;
 261	u64 total_sleep_time;
 262	u64 total_iowait_time;
 263	u64 total_preempt_time;
 264	u64 total_delay_time;
 265
 266	int last_state;
 267
 268	char shortname[3];
 269	bool comm_changed;
 270
 271	u64 migrations;
 272};
 273
 274/* per event run time data */
 275struct evsel_runtime {
 276	u64 *last_time; /* time this event was last seen per cpu */
 277	u32 ncpu;       /* highest cpu slot allocated */
 278};
 279
 280/* per cpu idle time data */
 281struct idle_thread_runtime {
 282	struct thread_runtime	tr;
 283	struct thread		*last_thread;
 284	struct rb_root_cached	sorted_root;
 285	struct callchain_root	callchain;
 286	struct callchain_cursor	cursor;
 287};
 288
 289/* track idle times per cpu */
 290static struct thread **idle_threads;
 291static int idle_max_cpu;
 292static char idle_comm[] = "<idle>";
 293
 294static u64 get_nsecs(void)
 295{
 296	struct timespec ts;
 297
 298	clock_gettime(CLOCK_MONOTONIC, &ts);
 299
 300	return ts.tv_sec * NSEC_PER_SEC + ts.tv_nsec;
 301}
 302
 303static void burn_nsecs(struct perf_sched *sched, u64 nsecs)
 304{
 305	u64 T0 = get_nsecs(), T1;
 306
 307	do {
 308		T1 = get_nsecs();
 309	} while (T1 + sched->run_measurement_overhead < T0 + nsecs);
 310}
 311
 312static void sleep_nsecs(u64 nsecs)
 313{
 314	struct timespec ts;
 315
 316	ts.tv_nsec = nsecs % 999999999;
 317	ts.tv_sec = nsecs / 999999999;
 318
 319	nanosleep(&ts, NULL);
 320}
 321
 322static void calibrate_run_measurement_overhead(struct perf_sched *sched)
 323{
 324	u64 T0, T1, delta, min_delta = NSEC_PER_SEC;
 325	int i;
 326
 327	for (i = 0; i < 10; i++) {
 328		T0 = get_nsecs();
 329		burn_nsecs(sched, 0);
 330		T1 = get_nsecs();
 331		delta = T1-T0;
 332		min_delta = min(min_delta, delta);
 333	}
 334	sched->run_measurement_overhead = min_delta;
 335
 336	printf("run measurement overhead: %" PRIu64 " nsecs\n", min_delta);
 337}
 338
 339static void calibrate_sleep_measurement_overhead(struct perf_sched *sched)
 340{
 341	u64 T0, T1, delta, min_delta = NSEC_PER_SEC;
 342	int i;
 343
 344	for (i = 0; i < 10; i++) {
 345		T0 = get_nsecs();
 346		sleep_nsecs(10000);
 347		T1 = get_nsecs();
 348		delta = T1-T0;
 349		min_delta = min(min_delta, delta);
 350	}
 351	min_delta -= 10000;
 352	sched->sleep_measurement_overhead = min_delta;
 353
 354	printf("sleep measurement overhead: %" PRIu64 " nsecs\n", min_delta);
 355}
 356
 357static struct sched_atom *
 358get_new_event(struct task_desc *task, u64 timestamp)
 359{
 360	struct sched_atom *event = zalloc(sizeof(*event));
 361	unsigned long idx = task->nr_events;
 362	size_t size;
 363
 364	event->timestamp = timestamp;
 365	event->nr = idx;
 366
 367	task->nr_events++;
 368	size = sizeof(struct sched_atom *) * task->nr_events;
 369	task->atoms = realloc(task->atoms, size);
 370	BUG_ON(!task->atoms);
 371
 372	task->atoms[idx] = event;
 373
 374	return event;
 375}
 376
 377static struct sched_atom *last_event(struct task_desc *task)
 378{
 379	if (!task->nr_events)
 380		return NULL;
 381
 382	return task->atoms[task->nr_events - 1];
 383}
 384
 385static void add_sched_event_run(struct perf_sched *sched, struct task_desc *task,
 386				u64 timestamp, u64 duration)
 387{
 388	struct sched_atom *event, *curr_event = last_event(task);
 389
 390	/*
 391	 * optimize an existing RUN event by merging this one
 392	 * to it:
 393	 */
 394	if (curr_event && curr_event->type == SCHED_EVENT_RUN) {
 395		sched->nr_run_events_optimized++;
 396		curr_event->duration += duration;
 397		return;
 398	}
 399
 400	event = get_new_event(task, timestamp);
 401
 402	event->type = SCHED_EVENT_RUN;
 403	event->duration = duration;
 404
 405	sched->nr_run_events++;
 406}
 407
 408static void add_sched_event_wakeup(struct perf_sched *sched, struct task_desc *task,
 409				   u64 timestamp, struct task_desc *wakee)
 410{
 411	struct sched_atom *event, *wakee_event;
 412
 413	event = get_new_event(task, timestamp);
 414	event->type = SCHED_EVENT_WAKEUP;
 415	event->wakee = wakee;
 416
 417	wakee_event = last_event(wakee);
 418	if (!wakee_event || wakee_event->type != SCHED_EVENT_SLEEP) {
 419		sched->targetless_wakeups++;
 420		return;
 421	}
 422	if (wakee_event->wait_sem) {
 423		sched->multitarget_wakeups++;
 424		return;
 425	}
 426
 427	wakee_event->wait_sem = zalloc(sizeof(*wakee_event->wait_sem));
 428	sem_init(wakee_event->wait_sem, 0, 0);
 429	wakee_event->specific_wait = 1;
 430	event->wait_sem = wakee_event->wait_sem;
 431
 432	sched->nr_wakeup_events++;
 433}
 434
 435static void add_sched_event_sleep(struct perf_sched *sched, struct task_desc *task,
 436				  u64 timestamp, u64 task_state __maybe_unused)
 437{
 438	struct sched_atom *event = get_new_event(task, timestamp);
 439
 440	event->type = SCHED_EVENT_SLEEP;
 441
 442	sched->nr_sleep_events++;
 443}
 444
 445static struct task_desc *register_pid(struct perf_sched *sched,
 446				      unsigned long pid, const char *comm)
 447{
 448	struct task_desc *task;
 449	static int pid_max;
 450
 451	if (sched->pid_to_task == NULL) {
 452		if (sysctl__read_int("kernel/pid_max", &pid_max) < 0)
 453			pid_max = MAX_PID;
 454		BUG_ON((sched->pid_to_task = calloc(pid_max, sizeof(struct task_desc *))) == NULL);
 455	}
 456	if (pid >= (unsigned long)pid_max) {
 457		BUG_ON((sched->pid_to_task = realloc(sched->pid_to_task, (pid + 1) *
 458			sizeof(struct task_desc *))) == NULL);
 459		while (pid >= (unsigned long)pid_max)
 460			sched->pid_to_task[pid_max++] = NULL;
 461	}
 462
 463	task = sched->pid_to_task[pid];
 464
 465	if (task)
 466		return task;
 467
 468	task = zalloc(sizeof(*task));
 469	task->pid = pid;
 470	task->nr = sched->nr_tasks;
 471	strcpy(task->comm, comm);
 472	/*
 473	 * every task starts in sleeping state - this gets ignored
 474	 * if there's no wakeup pointing to this sleep state:
 475	 */
 476	add_sched_event_sleep(sched, task, 0, 0);
 477
 478	sched->pid_to_task[pid] = task;
 479	sched->nr_tasks++;
 480	sched->tasks = realloc(sched->tasks, sched->nr_tasks * sizeof(struct task_desc *));
 481	BUG_ON(!sched->tasks);
 482	sched->tasks[task->nr] = task;
 483
 484	if (verbose > 0)
 485		printf("registered task #%ld, PID %ld (%s)\n", sched->nr_tasks, pid, comm);
 486
 487	return task;
 488}
 489
 490
 491static void print_task_traces(struct perf_sched *sched)
 492{
 493	struct task_desc *task;
 494	unsigned long i;
 495
 496	for (i = 0; i < sched->nr_tasks; i++) {
 497		task = sched->tasks[i];
 498		printf("task %6ld (%20s:%10ld), nr_events: %ld\n",
 499			task->nr, task->comm, task->pid, task->nr_events);
 500	}
 501}
 502
 503static void add_cross_task_wakeups(struct perf_sched *sched)
 504{
 505	struct task_desc *task1, *task2;
 506	unsigned long i, j;
 507
 508	for (i = 0; i < sched->nr_tasks; i++) {
 509		task1 = sched->tasks[i];
 510		j = i + 1;
 511		if (j == sched->nr_tasks)
 512			j = 0;
 513		task2 = sched->tasks[j];
 514		add_sched_event_wakeup(sched, task1, 0, task2);
 515	}
 516}
 517
 518static void perf_sched__process_event(struct perf_sched *sched,
 519				      struct sched_atom *atom)
 520{
 521	int ret = 0;
 522
 523	switch (atom->type) {
 524		case SCHED_EVENT_RUN:
 525			burn_nsecs(sched, atom->duration);
 526			break;
 527		case SCHED_EVENT_SLEEP:
 528			if (atom->wait_sem)
 529				ret = sem_wait(atom->wait_sem);
 530			BUG_ON(ret);
 531			break;
 532		case SCHED_EVENT_WAKEUP:
 533			if (atom->wait_sem)
 534				ret = sem_post(atom->wait_sem);
 535			BUG_ON(ret);
 536			break;
 537		case SCHED_EVENT_MIGRATION:
 538			break;
 539		default:
 540			BUG_ON(1);
 541	}
 542}
 543
 544static u64 get_cpu_usage_nsec_parent(void)
 545{
 546	struct rusage ru;
 547	u64 sum;
 548	int err;
 549
 550	err = getrusage(RUSAGE_SELF, &ru);
 551	BUG_ON(err);
 552
 553	sum =  ru.ru_utime.tv_sec * NSEC_PER_SEC + ru.ru_utime.tv_usec * NSEC_PER_USEC;
 554	sum += ru.ru_stime.tv_sec * NSEC_PER_SEC + ru.ru_stime.tv_usec * NSEC_PER_USEC;
 555
 556	return sum;
 557}
 558
 559static int self_open_counters(struct perf_sched *sched, unsigned long cur_task)
 560{
 561	struct perf_event_attr attr;
 562	char sbuf[STRERR_BUFSIZE], info[STRERR_BUFSIZE];
 563	int fd;
 564	struct rlimit limit;
 565	bool need_privilege = false;
 566
 567	memset(&attr, 0, sizeof(attr));
 568
 569	attr.type = PERF_TYPE_SOFTWARE;
 570	attr.config = PERF_COUNT_SW_TASK_CLOCK;
 571
 572force_again:
 573	fd = sys_perf_event_open(&attr, 0, -1, -1,
 574				 perf_event_open_cloexec_flag());
 575
 576	if (fd < 0) {
 577		if (errno == EMFILE) {
 578			if (sched->force) {
 579				BUG_ON(getrlimit(RLIMIT_NOFILE, &limit) == -1);
 580				limit.rlim_cur += sched->nr_tasks - cur_task;
 581				if (limit.rlim_cur > limit.rlim_max) {
 582					limit.rlim_max = limit.rlim_cur;
 583					need_privilege = true;
 584				}
 585				if (setrlimit(RLIMIT_NOFILE, &limit) == -1) {
 586					if (need_privilege && errno == EPERM)
 587						strcpy(info, "Need privilege\n");
 588				} else
 589					goto force_again;
 590			} else
 591				strcpy(info, "Have a try with -f option\n");
 592		}
 593		pr_err("Error: sys_perf_event_open() syscall returned "
 594		       "with %d (%s)\n%s", fd,
 595		       str_error_r(errno, sbuf, sizeof(sbuf)), info);
 596		exit(EXIT_FAILURE);
 597	}
 598	return fd;
 599}
 600
 601static u64 get_cpu_usage_nsec_self(int fd)
 602{
 603	u64 runtime;
 604	int ret;
 605
 606	ret = read(fd, &runtime, sizeof(runtime));
 607	BUG_ON(ret != sizeof(runtime));
 608
 609	return runtime;
 610}
 611
 612struct sched_thread_parms {
 613	struct task_desc  *task;
 614	struct perf_sched *sched;
 615	int fd;
 616};
 617
 618static void *thread_func(void *ctx)
 619{
 620	struct sched_thread_parms *parms = ctx;
 621	struct task_desc *this_task = parms->task;
 622	struct perf_sched *sched = parms->sched;
 623	u64 cpu_usage_0, cpu_usage_1;
 624	unsigned long i, ret;
 625	char comm2[22];
 626	int fd = parms->fd;
 627
 628	zfree(&parms);
 629
 630	sprintf(comm2, ":%s", this_task->comm);
 631	prctl(PR_SET_NAME, comm2);
 632	if (fd < 0)
 633		return NULL;
 634again:
 635	ret = sem_post(&this_task->ready_for_work);
 636	BUG_ON(ret);
 637	ret = pthread_mutex_lock(&sched->start_work_mutex);
 638	BUG_ON(ret);
 639	ret = pthread_mutex_unlock(&sched->start_work_mutex);
 640	BUG_ON(ret);
 641
 642	cpu_usage_0 = get_cpu_usage_nsec_self(fd);
 643
 644	for (i = 0; i < this_task->nr_events; i++) {
 645		this_task->curr_event = i;
 646		perf_sched__process_event(sched, this_task->atoms[i]);
 647	}
 648
 649	cpu_usage_1 = get_cpu_usage_nsec_self(fd);
 650	this_task->cpu_usage = cpu_usage_1 - cpu_usage_0;
 651	ret = sem_post(&this_task->work_done_sem);
 652	BUG_ON(ret);
 653
 654	ret = pthread_mutex_lock(&sched->work_done_wait_mutex);
 655	BUG_ON(ret);
 656	ret = pthread_mutex_unlock(&sched->work_done_wait_mutex);
 657	BUG_ON(ret);
 658
 659	goto again;
 660}
 661
 662static void create_tasks(struct perf_sched *sched)
 663{
 664	struct task_desc *task;
 665	pthread_attr_t attr;
 666	unsigned long i;
 667	int err;
 668
 669	err = pthread_attr_init(&attr);
 670	BUG_ON(err);
 671	err = pthread_attr_setstacksize(&attr,
 672			(size_t) max(16 * 1024, PTHREAD_STACK_MIN));
 673	BUG_ON(err);
 674	err = pthread_mutex_lock(&sched->start_work_mutex);
 675	BUG_ON(err);
 676	err = pthread_mutex_lock(&sched->work_done_wait_mutex);
 677	BUG_ON(err);
 678	for (i = 0; i < sched->nr_tasks; i++) {
 679		struct sched_thread_parms *parms = malloc(sizeof(*parms));
 680		BUG_ON(parms == NULL);
 681		parms->task = task = sched->tasks[i];
 682		parms->sched = sched;
 683		parms->fd = self_open_counters(sched, i);
 684		sem_init(&task->sleep_sem, 0, 0);
 685		sem_init(&task->ready_for_work, 0, 0);
 686		sem_init(&task->work_done_sem, 0, 0);
 687		task->curr_event = 0;
 688		err = pthread_create(&task->thread, &attr, thread_func, parms);
 689		BUG_ON(err);
 690	}
 691}
 692
 693static void wait_for_tasks(struct perf_sched *sched)
 694{
 695	u64 cpu_usage_0, cpu_usage_1;
 696	struct task_desc *task;
 697	unsigned long i, ret;
 698
 699	sched->start_time = get_nsecs();
 700	sched->cpu_usage = 0;
 701	pthread_mutex_unlock(&sched->work_done_wait_mutex);
 702
 703	for (i = 0; i < sched->nr_tasks; i++) {
 704		task = sched->tasks[i];
 705		ret = sem_wait(&task->ready_for_work);
 706		BUG_ON(ret);
 707		sem_init(&task->ready_for_work, 0, 0);
 708	}
 709	ret = pthread_mutex_lock(&sched->work_done_wait_mutex);
 710	BUG_ON(ret);
 711
 712	cpu_usage_0 = get_cpu_usage_nsec_parent();
 713
 714	pthread_mutex_unlock(&sched->start_work_mutex);
 715
 716	for (i = 0; i < sched->nr_tasks; i++) {
 717		task = sched->tasks[i];
 718		ret = sem_wait(&task->work_done_sem);
 719		BUG_ON(ret);
 720		sem_init(&task->work_done_sem, 0, 0);
 721		sched->cpu_usage += task->cpu_usage;
 722		task->cpu_usage = 0;
 723	}
 724
 725	cpu_usage_1 = get_cpu_usage_nsec_parent();
 726	if (!sched->runavg_cpu_usage)
 727		sched->runavg_cpu_usage = sched->cpu_usage;
 728	sched->runavg_cpu_usage = (sched->runavg_cpu_usage * (sched->replay_repeat - 1) + sched->cpu_usage) / sched->replay_repeat;
 729
 730	sched->parent_cpu_usage = cpu_usage_1 - cpu_usage_0;
 731	if (!sched->runavg_parent_cpu_usage)
 732		sched->runavg_parent_cpu_usage = sched->parent_cpu_usage;
 733	sched->runavg_parent_cpu_usage = (sched->runavg_parent_cpu_usage * (sched->replay_repeat - 1) +
 734					 sched->parent_cpu_usage)/sched->replay_repeat;
 735
 736	ret = pthread_mutex_lock(&sched->start_work_mutex);
 737	BUG_ON(ret);
 738
 739	for (i = 0; i < sched->nr_tasks; i++) {
 740		task = sched->tasks[i];
 741		sem_init(&task->sleep_sem, 0, 0);
 742		task->curr_event = 0;
 743	}
 744}
 745
 746static void run_one_test(struct perf_sched *sched)
 747{
 748	u64 T0, T1, delta, avg_delta, fluct;
 749
 750	T0 = get_nsecs();
 751	wait_for_tasks(sched);
 752	T1 = get_nsecs();
 753
 754	delta = T1 - T0;
 755	sched->sum_runtime += delta;
 756	sched->nr_runs++;
 757
 758	avg_delta = sched->sum_runtime / sched->nr_runs;
 759	if (delta < avg_delta)
 760		fluct = avg_delta - delta;
 761	else
 762		fluct = delta - avg_delta;
 763	sched->sum_fluct += fluct;
 764	if (!sched->run_avg)
 765		sched->run_avg = delta;
 766	sched->run_avg = (sched->run_avg * (sched->replay_repeat - 1) + delta) / sched->replay_repeat;
 767
 768	printf("#%-3ld: %0.3f, ", sched->nr_runs, (double)delta / NSEC_PER_MSEC);
 769
 770	printf("ravg: %0.2f, ", (double)sched->run_avg / NSEC_PER_MSEC);
 771
 772	printf("cpu: %0.2f / %0.2f",
 773		(double)sched->cpu_usage / NSEC_PER_MSEC, (double)sched->runavg_cpu_usage / NSEC_PER_MSEC);
 774
 775#if 0
 776	/*
 777	 * rusage statistics done by the parent, these are less
 778	 * accurate than the sched->sum_exec_runtime based statistics:
 779	 */
 780	printf(" [%0.2f / %0.2f]",
 781		(double)sched->parent_cpu_usage / NSEC_PER_MSEC,
 782		(double)sched->runavg_parent_cpu_usage / NSEC_PER_MSEC);
 783#endif
 784
 785	printf("\n");
 786
 787	if (sched->nr_sleep_corrections)
 788		printf(" (%ld sleep corrections)\n", sched->nr_sleep_corrections);
 789	sched->nr_sleep_corrections = 0;
 790}
 791
 792static void test_calibrations(struct perf_sched *sched)
 793{
 794	u64 T0, T1;
 795
 796	T0 = get_nsecs();
 797	burn_nsecs(sched, NSEC_PER_MSEC);
 798	T1 = get_nsecs();
 799
 800	printf("the run test took %" PRIu64 " nsecs\n", T1 - T0);
 801
 802	T0 = get_nsecs();
 803	sleep_nsecs(NSEC_PER_MSEC);
 804	T1 = get_nsecs();
 805
 806	printf("the sleep test took %" PRIu64 " nsecs\n", T1 - T0);
 807}
 808
 809static int
 810replay_wakeup_event(struct perf_sched *sched,
 811		    struct evsel *evsel, struct perf_sample *sample,
 812		    struct machine *machine __maybe_unused)
 813{
 814	const char *comm = evsel__strval(evsel, sample, "comm");
 815	const u32 pid	 = evsel__intval(evsel, sample, "pid");
 816	struct task_desc *waker, *wakee;
 817
 818	if (verbose > 0) {
 819		printf("sched_wakeup event %p\n", evsel);
 820
 821		printf(" ... pid %d woke up %s/%d\n", sample->tid, comm, pid);
 822	}
 823
 824	waker = register_pid(sched, sample->tid, "<unknown>");
 825	wakee = register_pid(sched, pid, comm);
 826
 827	add_sched_event_wakeup(sched, waker, sample->time, wakee);
 828	return 0;
 829}
 830
 831static int replay_switch_event(struct perf_sched *sched,
 832			       struct evsel *evsel,
 833			       struct perf_sample *sample,
 834			       struct machine *machine __maybe_unused)
 835{
 836	const char *prev_comm  = evsel__strval(evsel, sample, "prev_comm"),
 837		   *next_comm  = evsel__strval(evsel, sample, "next_comm");
 838	const u32 prev_pid = evsel__intval(evsel, sample, "prev_pid"),
 839		  next_pid = evsel__intval(evsel, sample, "next_pid");
 840	const u64 prev_state = evsel__intval(evsel, sample, "prev_state");
 841	struct task_desc *prev, __maybe_unused *next;
 842	u64 timestamp0, timestamp = sample->time;
 843	int cpu = sample->cpu;
 844	s64 delta;
 845
 846	if (verbose > 0)
 847		printf("sched_switch event %p\n", evsel);
 848
 849	if (cpu >= MAX_CPUS || cpu < 0)
 850		return 0;
 851
 852	timestamp0 = sched->cpu_last_switched[cpu];
 853	if (timestamp0)
 854		delta = timestamp - timestamp0;
 855	else
 856		delta = 0;
 857
 858	if (delta < 0) {
 859		pr_err("hm, delta: %" PRIu64 " < 0 ?\n", delta);
 860		return -1;
 861	}
 862
 863	pr_debug(" ... switch from %s/%d to %s/%d [ran %" PRIu64 " nsecs]\n",
 864		 prev_comm, prev_pid, next_comm, next_pid, delta);
 865
 866	prev = register_pid(sched, prev_pid, prev_comm);
 867	next = register_pid(sched, next_pid, next_comm);
 868
 869	sched->cpu_last_switched[cpu] = timestamp;
 870
 871	add_sched_event_run(sched, prev, timestamp, delta);
 872	add_sched_event_sleep(sched, prev, timestamp, prev_state);
 873
 874	return 0;
 875}
 876
 877static int replay_fork_event(struct perf_sched *sched,
 878			     union perf_event *event,
 879			     struct machine *machine)
 880{
 881	struct thread *child, *parent;
 882
 883	child = machine__findnew_thread(machine, event->fork.pid,
 884					event->fork.tid);
 885	parent = machine__findnew_thread(machine, event->fork.ppid,
 886					 event->fork.ptid);
 887
 888	if (child == NULL || parent == NULL) {
 889		pr_debug("thread does not exist on fork event: child %p, parent %p\n",
 890				 child, parent);
 891		goto out_put;
 892	}
 893
 894	if (verbose > 0) {
 895		printf("fork event\n");
 896		printf("... parent: %s/%d\n", thread__comm_str(parent), parent->tid);
 897		printf("...  child: %s/%d\n", thread__comm_str(child), child->tid);
 898	}
 899
 900	register_pid(sched, parent->tid, thread__comm_str(parent));
 901	register_pid(sched, child->tid, thread__comm_str(child));
 902out_put:
 903	thread__put(child);
 904	thread__put(parent);
 905	return 0;
 906}
 907
 908struct sort_dimension {
 909	const char		*name;
 910	sort_fn_t		cmp;
 911	struct list_head	list;
 912};
 913
 914/*
 915 * handle runtime stats saved per thread
 916 */
 917static struct thread_runtime *thread__init_runtime(struct thread *thread)
 918{
 919	struct thread_runtime *r;
 920
 921	r = zalloc(sizeof(struct thread_runtime));
 922	if (!r)
 923		return NULL;
 924
 925	init_stats(&r->run_stats);
 926	thread__set_priv(thread, r);
 927
 928	return r;
 929}
 930
 931static struct thread_runtime *thread__get_runtime(struct thread *thread)
 932{
 933	struct thread_runtime *tr;
 934
 935	tr = thread__priv(thread);
 936	if (tr == NULL) {
 937		tr = thread__init_runtime(thread);
 938		if (tr == NULL)
 939			pr_debug("Failed to malloc memory for runtime data.\n");
 940	}
 941
 942	return tr;
 943}
 944
 945static int
 946thread_lat_cmp(struct list_head *list, struct work_atoms *l, struct work_atoms *r)
 947{
 948	struct sort_dimension *sort;
 949	int ret = 0;
 950
 951	BUG_ON(list_empty(list));
 952
 953	list_for_each_entry(sort, list, list) {
 954		ret = sort->cmp(l, r);
 955		if (ret)
 956			return ret;
 957	}
 958
 959	return ret;
 960}
 961
 962static struct work_atoms *
 963thread_atoms_search(struct rb_root_cached *root, struct thread *thread,
 964			 struct list_head *sort_list)
 965{
 966	struct rb_node *node = root->rb_root.rb_node;
 967	struct work_atoms key = { .thread = thread };
 968
 969	while (node) {
 970		struct work_atoms *atoms;
 971		int cmp;
 972
 973		atoms = container_of(node, struct work_atoms, node);
 974
 975		cmp = thread_lat_cmp(sort_list, &key, atoms);
 976		if (cmp > 0)
 977			node = node->rb_left;
 978		else if (cmp < 0)
 979			node = node->rb_right;
 980		else {
 981			BUG_ON(thread != atoms->thread);
 982			return atoms;
 983		}
 984	}
 985	return NULL;
 986}
 987
 988static void
 989__thread_latency_insert(struct rb_root_cached *root, struct work_atoms *data,
 990			 struct list_head *sort_list)
 991{
 992	struct rb_node **new = &(root->rb_root.rb_node), *parent = NULL;
 993	bool leftmost = true;
 994
 995	while (*new) {
 996		struct work_atoms *this;
 997		int cmp;
 998
 999		this = container_of(*new, struct work_atoms, node);
1000		parent = *new;
1001
1002		cmp = thread_lat_cmp(sort_list, data, this);
1003
1004		if (cmp > 0)
1005			new = &((*new)->rb_left);
1006		else {
1007			new = &((*new)->rb_right);
1008			leftmost = false;
1009		}
1010	}
1011
1012	rb_link_node(&data->node, parent, new);
1013	rb_insert_color_cached(&data->node, root, leftmost);
1014}
1015
1016static int thread_atoms_insert(struct perf_sched *sched, struct thread *thread)
1017{
1018	struct work_atoms *atoms = zalloc(sizeof(*atoms));
1019	if (!atoms) {
1020		pr_err("No memory at %s\n", __func__);
1021		return -1;
1022	}
1023
1024	atoms->thread = thread__get(thread);
1025	INIT_LIST_HEAD(&atoms->work_list);
1026	__thread_latency_insert(&sched->atom_root, atoms, &sched->cmp_pid);
1027	return 0;
1028}
1029
1030static char sched_out_state(u64 prev_state)
1031{
1032	const char *str = TASK_STATE_TO_CHAR_STR;
1033
1034	return str[prev_state];
1035}
1036
1037static int
1038add_sched_out_event(struct work_atoms *atoms,
1039		    char run_state,
1040		    u64 timestamp)
1041{
1042	struct work_atom *atom = zalloc(sizeof(*atom));
1043	if (!atom) {
1044		pr_err("Non memory at %s", __func__);
1045		return -1;
1046	}
1047
1048	atom->sched_out_time = timestamp;
1049
1050	if (run_state == 'R') {
1051		atom->state = THREAD_WAIT_CPU;
1052		atom->wake_up_time = atom->sched_out_time;
1053	}
1054
1055	list_add_tail(&atom->list, &atoms->work_list);
1056	return 0;
1057}
1058
1059static void
1060add_runtime_event(struct work_atoms *atoms, u64 delta,
1061		  u64 timestamp __maybe_unused)
1062{
1063	struct work_atom *atom;
1064
1065	BUG_ON(list_empty(&atoms->work_list));
1066
1067	atom = list_entry(atoms->work_list.prev, struct work_atom, list);
1068
1069	atom->runtime += delta;
1070	atoms->total_runtime += delta;
1071}
1072
1073static void
1074add_sched_in_event(struct work_atoms *atoms, u64 timestamp)
1075{
1076	struct work_atom *atom;
1077	u64 delta;
1078
1079	if (list_empty(&atoms->work_list))
1080		return;
1081
1082	atom = list_entry(atoms->work_list.prev, struct work_atom, list);
1083
1084	if (atom->state != THREAD_WAIT_CPU)
1085		return;
1086
1087	if (timestamp < atom->wake_up_time) {
1088		atom->state = THREAD_IGNORE;
1089		return;
1090	}
1091
1092	atom->state = THREAD_SCHED_IN;
1093	atom->sched_in_time = timestamp;
1094
1095	delta = atom->sched_in_time - atom->wake_up_time;
1096	atoms->total_lat += delta;
1097	if (delta > atoms->max_lat) {
1098		atoms->max_lat = delta;
1099		atoms->max_lat_at = timestamp;
1100	}
1101	atoms->nb_atoms++;
1102}
1103
1104static int latency_switch_event(struct perf_sched *sched,
1105				struct evsel *evsel,
1106				struct perf_sample *sample,
1107				struct machine *machine)
1108{
1109	const u32 prev_pid = evsel__intval(evsel, sample, "prev_pid"),
1110		  next_pid = evsel__intval(evsel, sample, "next_pid");
1111	const u64 prev_state = evsel__intval(evsel, sample, "prev_state");
1112	struct work_atoms *out_events, *in_events;
1113	struct thread *sched_out, *sched_in;
1114	u64 timestamp0, timestamp = sample->time;
1115	int cpu = sample->cpu, err = -1;
1116	s64 delta;
1117
1118	BUG_ON(cpu >= MAX_CPUS || cpu < 0);
1119
1120	timestamp0 = sched->cpu_last_switched[cpu];
1121	sched->cpu_last_switched[cpu] = timestamp;
1122	if (timestamp0)
1123		delta = timestamp - timestamp0;
1124	else
1125		delta = 0;
1126
1127	if (delta < 0) {
1128		pr_err("hm, delta: %" PRIu64 " < 0 ?\n", delta);
1129		return -1;
1130	}
1131
1132	sched_out = machine__findnew_thread(machine, -1, prev_pid);
1133	sched_in = machine__findnew_thread(machine, -1, next_pid);
1134	if (sched_out == NULL || sched_in == NULL)
1135		goto out_put;
1136
1137	out_events = thread_atoms_search(&sched->atom_root, sched_out, &sched->cmp_pid);
1138	if (!out_events) {
1139		if (thread_atoms_insert(sched, sched_out))
1140			goto out_put;
1141		out_events = thread_atoms_search(&sched->atom_root, sched_out, &sched->cmp_pid);
1142		if (!out_events) {
1143			pr_err("out-event: Internal tree error");
1144			goto out_put;
1145		}
1146	}
1147	if (add_sched_out_event(out_events, sched_out_state(prev_state), timestamp))
1148		return -1;
1149
1150	in_events = thread_atoms_search(&sched->atom_root, sched_in, &sched->cmp_pid);
1151	if (!in_events) {
1152		if (thread_atoms_insert(sched, sched_in))
1153			goto out_put;
1154		in_events = thread_atoms_search(&sched->atom_root, sched_in, &sched->cmp_pid);
1155		if (!in_events) {
1156			pr_err("in-event: Internal tree error");
1157			goto out_put;
1158		}
1159		/*
1160		 * Take came in we have not heard about yet,
1161		 * add in an initial atom in runnable state:
1162		 */
1163		if (add_sched_out_event(in_events, 'R', timestamp))
1164			goto out_put;
1165	}
1166	add_sched_in_event(in_events, timestamp);
1167	err = 0;
1168out_put:
1169	thread__put(sched_out);
1170	thread__put(sched_in);
1171	return err;
1172}
1173
1174static int latency_runtime_event(struct perf_sched *sched,
1175				 struct evsel *evsel,
1176				 struct perf_sample *sample,
1177				 struct machine *machine)
1178{
1179	const u32 pid	   = evsel__intval(evsel, sample, "pid");
1180	const u64 runtime  = evsel__intval(evsel, sample, "runtime");
1181	struct thread *thread = machine__findnew_thread(machine, -1, pid);
1182	struct work_atoms *atoms = thread_atoms_search(&sched->atom_root, thread, &sched->cmp_pid);
1183	u64 timestamp = sample->time;
1184	int cpu = sample->cpu, err = -1;
1185
1186	if (thread == NULL)
1187		return -1;
1188
1189	BUG_ON(cpu >= MAX_CPUS || cpu < 0);
1190	if (!atoms) {
1191		if (thread_atoms_insert(sched, thread))
1192			goto out_put;
1193		atoms = thread_atoms_search(&sched->atom_root, thread, &sched->cmp_pid);
1194		if (!atoms) {
1195			pr_err("in-event: Internal tree error");
1196			goto out_put;
1197		}
1198		if (add_sched_out_event(atoms, 'R', timestamp))
1199			goto out_put;
1200	}
1201
1202	add_runtime_event(atoms, runtime, timestamp);
1203	err = 0;
1204out_put:
1205	thread__put(thread);
1206	return err;
1207}
1208
1209static int latency_wakeup_event(struct perf_sched *sched,
1210				struct evsel *evsel,
1211				struct perf_sample *sample,
1212				struct machine *machine)
1213{
1214	const u32 pid	  = evsel__intval(evsel, sample, "pid");
1215	struct work_atoms *atoms;
1216	struct work_atom *atom;
1217	struct thread *wakee;
1218	u64 timestamp = sample->time;
1219	int err = -1;
1220
1221	wakee = machine__findnew_thread(machine, -1, pid);
1222	if (wakee == NULL)
1223		return -1;
1224	atoms = thread_atoms_search(&sched->atom_root, wakee, &sched->cmp_pid);
1225	if (!atoms) {
1226		if (thread_atoms_insert(sched, wakee))
1227			goto out_put;
1228		atoms = thread_atoms_search(&sched->atom_root, wakee, &sched->cmp_pid);
1229		if (!atoms) {
1230			pr_err("wakeup-event: Internal tree error");
1231			goto out_put;
1232		}
1233		if (add_sched_out_event(atoms, 'S', timestamp))
1234			goto out_put;
1235	}
1236
1237	BUG_ON(list_empty(&atoms->work_list));
1238
1239	atom = list_entry(atoms->work_list.prev, struct work_atom, list);
1240
1241	/*
1242	 * As we do not guarantee the wakeup event happens when
1243	 * task is out of run queue, also may happen when task is
1244	 * on run queue and wakeup only change ->state to TASK_RUNNING,
1245	 * then we should not set the ->wake_up_time when wake up a
1246	 * task which is on run queue.
1247	 *
1248	 * You WILL be missing events if you've recorded only
1249	 * one CPU, or are only looking at only one, so don't
1250	 * skip in this case.
1251	 */
1252	if (sched->profile_cpu == -1 && atom->state != THREAD_SLEEPING)
1253		goto out_ok;
1254
1255	sched->nr_timestamps++;
1256	if (atom->sched_out_time > timestamp) {
1257		sched->nr_unordered_timestamps++;
1258		goto out_ok;
1259	}
1260
1261	atom->state = THREAD_WAIT_CPU;
1262	atom->wake_up_time = timestamp;
1263out_ok:
1264	err = 0;
1265out_put:
1266	thread__put(wakee);
1267	return err;
1268}
1269
1270static int latency_migrate_task_event(struct perf_sched *sched,
1271				      struct evsel *evsel,
1272				      struct perf_sample *sample,
1273				      struct machine *machine)
1274{
1275	const u32 pid = evsel__intval(evsel, sample, "pid");
1276	u64 timestamp = sample->time;
1277	struct work_atoms *atoms;
1278	struct work_atom *atom;
1279	struct thread *migrant;
1280	int err = -1;
1281
1282	/*
1283	 * Only need to worry about migration when profiling one CPU.
1284	 */
1285	if (sched->profile_cpu == -1)
1286		return 0;
1287
1288	migrant = machine__findnew_thread(machine, -1, pid);
1289	if (migrant == NULL)
1290		return -1;
1291	atoms = thread_atoms_search(&sched->atom_root, migrant, &sched->cmp_pid);
1292	if (!atoms) {
1293		if (thread_atoms_insert(sched, migrant))
1294			goto out_put;
1295		register_pid(sched, migrant->tid, thread__comm_str(migrant));
1296		atoms = thread_atoms_search(&sched->atom_root, migrant, &sched->cmp_pid);
1297		if (!atoms) {
1298			pr_err("migration-event: Internal tree error");
1299			goto out_put;
1300		}
1301		if (add_sched_out_event(atoms, 'R', timestamp))
1302			goto out_put;
1303	}
1304
1305	BUG_ON(list_empty(&atoms->work_list));
1306
1307	atom = list_entry(atoms->work_list.prev, struct work_atom, list);
1308	atom->sched_in_time = atom->sched_out_time = atom->wake_up_time = timestamp;
1309
1310	sched->nr_timestamps++;
1311
1312	if (atom->sched_out_time > timestamp)
1313		sched->nr_unordered_timestamps++;
1314	err = 0;
1315out_put:
1316	thread__put(migrant);
1317	return err;
1318}
1319
1320static void output_lat_thread(struct perf_sched *sched, struct work_atoms *work_list)
1321{
1322	int i;
1323	int ret;
1324	u64 avg;
1325	char max_lat_at[32];
1326
1327	if (!work_list->nb_atoms)
1328		return;
1329	/*
1330	 * Ignore idle threads:
1331	 */
1332	if (!strcmp(thread__comm_str(work_list->thread), "swapper"))
1333		return;
1334
1335	sched->all_runtime += work_list->total_runtime;
1336	sched->all_count   += work_list->nb_atoms;
1337
1338	if (work_list->num_merged > 1)
1339		ret = printf("  %s:(%d) ", thread__comm_str(work_list->thread), work_list->num_merged);
1340	else
1341		ret = printf("  %s:%d ", thread__comm_str(work_list->thread), work_list->thread->tid);
1342
1343	for (i = 0; i < 24 - ret; i++)
1344		printf(" ");
1345
1346	avg = work_list->total_lat / work_list->nb_atoms;
1347	timestamp__scnprintf_usec(work_list->max_lat_at, max_lat_at, sizeof(max_lat_at));
1348
1349	printf("|%11.3f ms |%9" PRIu64 " | avg:%9.3f ms | max:%9.3f ms | max at: %13s s\n",
1350	      (double)work_list->total_runtime / NSEC_PER_MSEC,
1351		 work_list->nb_atoms, (double)avg / NSEC_PER_MSEC,
1352		 (double)work_list->max_lat / NSEC_PER_MSEC,
1353		 max_lat_at);
1354}
1355
1356static int pid_cmp(struct work_atoms *l, struct work_atoms *r)
1357{
1358	if (l->thread == r->thread)
1359		return 0;
1360	if (l->thread->tid < r->thread->tid)
1361		return -1;
1362	if (l->thread->tid > r->thread->tid)
1363		return 1;
1364	return (int)(l->thread - r->thread);
1365}
1366
1367static int avg_cmp(struct work_atoms *l, struct work_atoms *r)
1368{
1369	u64 avgl, avgr;
1370
1371	if (!l->nb_atoms)
1372		return -1;
1373
1374	if (!r->nb_atoms)
1375		return 1;
1376
1377	avgl = l->total_lat / l->nb_atoms;
1378	avgr = r->total_lat / r->nb_atoms;
1379
1380	if (avgl < avgr)
1381		return -1;
1382	if (avgl > avgr)
1383		return 1;
1384
1385	return 0;
1386}
1387
1388static int max_cmp(struct work_atoms *l, struct work_atoms *r)
1389{
1390	if (l->max_lat < r->max_lat)
1391		return -1;
1392	if (l->max_lat > r->max_lat)
1393		return 1;
1394
1395	return 0;
1396}
1397
1398static int switch_cmp(struct work_atoms *l, struct work_atoms *r)
1399{
1400	if (l->nb_atoms < r->nb_atoms)
1401		return -1;
1402	if (l->nb_atoms > r->nb_atoms)
1403		return 1;
1404
1405	return 0;
1406}
1407
1408static int runtime_cmp(struct work_atoms *l, struct work_atoms *r)
1409{
1410	if (l->total_runtime < r->total_runtime)
1411		return -1;
1412	if (l->total_runtime > r->total_runtime)
1413		return 1;
1414
1415	return 0;
1416}
1417
1418static int sort_dimension__add(const char *tok, struct list_head *list)
1419{
1420	size_t i;
1421	static struct sort_dimension avg_sort_dimension = {
1422		.name = "avg",
1423		.cmp  = avg_cmp,
1424	};
1425	static struct sort_dimension max_sort_dimension = {
1426		.name = "max",
1427		.cmp  = max_cmp,
1428	};
1429	static struct sort_dimension pid_sort_dimension = {
1430		.name = "pid",
1431		.cmp  = pid_cmp,
1432	};
1433	static struct sort_dimension runtime_sort_dimension = {
1434		.name = "runtime",
1435		.cmp  = runtime_cmp,
1436	};
1437	static struct sort_dimension switch_sort_dimension = {
1438		.name = "switch",
1439		.cmp  = switch_cmp,
1440	};
1441	struct sort_dimension *available_sorts[] = {
1442		&pid_sort_dimension,
1443		&avg_sort_dimension,
1444		&max_sort_dimension,
1445		&switch_sort_dimension,
1446		&runtime_sort_dimension,
1447	};
1448
1449	for (i = 0; i < ARRAY_SIZE(available_sorts); i++) {
1450		if (!strcmp(available_sorts[i]->name, tok)) {
1451			list_add_tail(&available_sorts[i]->list, list);
1452
1453			return 0;
1454		}
1455	}
1456
1457	return -1;
1458}
1459
1460static void perf_sched__sort_lat(struct perf_sched *sched)
1461{
1462	struct rb_node *node;
1463	struct rb_root_cached *root = &sched->atom_root;
1464again:
1465	for (;;) {
1466		struct work_atoms *data;
1467		node = rb_first_cached(root);
1468		if (!node)
1469			break;
1470
1471		rb_erase_cached(node, root);
1472		data = rb_entry(node, struct work_atoms, node);
1473		__thread_latency_insert(&sched->sorted_atom_root, data, &sched->sort_list);
1474	}
1475	if (root == &sched->atom_root) {
1476		root = &sched->merged_atom_root;
1477		goto again;
1478	}
1479}
1480
1481static int process_sched_wakeup_event(struct perf_tool *tool,
1482				      struct evsel *evsel,
1483				      struct perf_sample *sample,
1484				      struct machine *machine)
1485{
1486	struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
1487
1488	if (sched->tp_handler->wakeup_event)
1489		return sched->tp_handler->wakeup_event(sched, evsel, sample, machine);
1490
1491	return 0;
1492}
1493
1494union map_priv {
1495	void	*ptr;
1496	bool	 color;
1497};
1498
1499static bool thread__has_color(struct thread *thread)
1500{
1501	union map_priv priv = {
1502		.ptr = thread__priv(thread),
1503	};
1504
1505	return priv.color;
1506}
1507
1508static struct thread*
1509map__findnew_thread(struct perf_sched *sched, struct machine *machine, pid_t pid, pid_t tid)
1510{
1511	struct thread *thread = machine__findnew_thread(machine, pid, tid);
1512	union map_priv priv = {
1513		.color = false,
1514	};
1515
1516	if (!sched->map.color_pids || !thread || thread__priv(thread))
1517		return thread;
1518
1519	if (thread_map__has(sched->map.color_pids, tid))
1520		priv.color = true;
1521
1522	thread__set_priv(thread, priv.ptr);
1523	return thread;
1524}
1525
1526static int map_switch_event(struct perf_sched *sched, struct evsel *evsel,
1527			    struct perf_sample *sample, struct machine *machine)
1528{
1529	const u32 next_pid = evsel__intval(evsel, sample, "next_pid");
1530	struct thread *sched_in;
1531	struct thread_runtime *tr;
1532	int new_shortname;
1533	u64 timestamp0, timestamp = sample->time;
1534	s64 delta;
1535	int i, this_cpu = sample->cpu;
1536	int cpus_nr;
1537	bool new_cpu = false;
1538	const char *color = PERF_COLOR_NORMAL;
1539	char stimestamp[32];
1540
1541	BUG_ON(this_cpu >= MAX_CPUS || this_cpu < 0);
1542
1543	if (this_cpu > sched->max_cpu)
1544		sched->max_cpu = this_cpu;
1545
1546	if (sched->map.comp) {
1547		cpus_nr = bitmap_weight(sched->map.comp_cpus_mask, MAX_CPUS);
1548		if (!test_and_set_bit(this_cpu, sched->map.comp_cpus_mask)) {
1549			sched->map.comp_cpus[cpus_nr++] = this_cpu;
1550			new_cpu = true;
1551		}
1552	} else
1553		cpus_nr = sched->max_cpu;
1554
1555	timestamp0 = sched->cpu_last_switched[this_cpu];
1556	sched->cpu_last_switched[this_cpu] = timestamp;
1557	if (timestamp0)
1558		delta = timestamp - timestamp0;
1559	else
1560		delta = 0;
1561
1562	if (delta < 0) {
1563		pr_err("hm, delta: %" PRIu64 " < 0 ?\n", delta);
1564		return -1;
1565	}
1566
1567	sched_in = map__findnew_thread(sched, machine, -1, next_pid);
1568	if (sched_in == NULL)
1569		return -1;
1570
1571	tr = thread__get_runtime(sched_in);
1572	if (tr == NULL) {
1573		thread__put(sched_in);
1574		return -1;
1575	}
1576
1577	sched->curr_thread[this_cpu] = thread__get(sched_in);
1578
1579	printf("  ");
1580
1581	new_shortname = 0;
1582	if (!tr->shortname[0]) {
1583		if (!strcmp(thread__comm_str(sched_in), "swapper")) {
1584			/*
1585			 * Don't allocate a letter-number for swapper:0
1586			 * as a shortname. Instead, we use '.' for it.
1587			 */
1588			tr->shortname[0] = '.';
1589			tr->shortname[1] = ' ';
1590		} else {
1591			tr->shortname[0] = sched->next_shortname1;
1592			tr->shortname[1] = sched->next_shortname2;
1593
1594			if (sched->next_shortname1 < 'Z') {
1595				sched->next_shortname1++;
1596			} else {
1597				sched->next_shortname1 = 'A';
1598				if (sched->next_shortname2 < '9')
1599					sched->next_shortname2++;
1600				else
1601					sched->next_shortname2 = '0';
1602			}
1603		}
1604		new_shortname = 1;
1605	}
1606
1607	for (i = 0; i < cpus_nr; i++) {
1608		int cpu = sched->map.comp ? sched->map.comp_cpus[i] : i;
1609		struct thread *curr_thread = sched->curr_thread[cpu];
1610		struct thread_runtime *curr_tr;
1611		const char *pid_color = color;
1612		const char *cpu_color = color;
1613
1614		if (curr_thread && thread__has_color(curr_thread))
1615			pid_color = COLOR_PIDS;
1616
1617		if (sched->map.cpus && !cpu_map__has(sched->map.cpus, cpu))
1618			continue;
1619
1620		if (sched->map.color_cpus && cpu_map__has(sched->map.color_cpus, cpu))
1621			cpu_color = COLOR_CPUS;
1622
1623		if (cpu != this_cpu)
1624			color_fprintf(stdout, color, " ");
1625		else
1626			color_fprintf(stdout, cpu_color, "*");
1627
1628		if (sched->curr_thread[cpu]) {
1629			curr_tr = thread__get_runtime(sched->curr_thread[cpu]);
1630			if (curr_tr == NULL) {
1631				thread__put(sched_in);
1632				return -1;
1633			}
1634			color_fprintf(stdout, pid_color, "%2s ", curr_tr->shortname);
1635		} else
1636			color_fprintf(stdout, color, "   ");
1637	}
1638
1639	if (sched->map.cpus && !cpu_map__has(sched->map.cpus, this_cpu))
1640		goto out;
1641
1642	timestamp__scnprintf_usec(timestamp, stimestamp, sizeof(stimestamp));
1643	color_fprintf(stdout, color, "  %12s secs ", stimestamp);
1644	if (new_shortname || tr->comm_changed || (verbose > 0 && sched_in->tid)) {
1645		const char *pid_color = color;
1646
1647		if (thread__has_color(sched_in))
1648			pid_color = COLOR_PIDS;
1649
1650		color_fprintf(stdout, pid_color, "%s => %s:%d",
1651		       tr->shortname, thread__comm_str(sched_in), sched_in->tid);
1652		tr->comm_changed = false;
1653	}
1654
1655	if (sched->map.comp && new_cpu)
1656		color_fprintf(stdout, color, " (CPU %d)", this_cpu);
1657
1658out:
1659	color_fprintf(stdout, color, "\n");
1660
1661	thread__put(sched_in);
1662
1663	return 0;
1664}
1665
1666static int process_sched_switch_event(struct perf_tool *tool,
1667				      struct evsel *evsel,
1668				      struct perf_sample *sample,
1669				      struct machine *machine)
1670{
1671	struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
1672	int this_cpu = sample->cpu, err = 0;
1673	u32 prev_pid = evsel__intval(evsel, sample, "prev_pid"),
1674	    next_pid = evsel__intval(evsel, sample, "next_pid");
1675
1676	if (sched->curr_pid[this_cpu] != (u32)-1) {
1677		/*
1678		 * Are we trying to switch away a PID that is
1679		 * not current?
1680		 */
1681		if (sched->curr_pid[this_cpu] != prev_pid)
1682			sched->nr_context_switch_bugs++;
1683	}
1684
1685	if (sched->tp_handler->switch_event)
1686		err = sched->tp_handler->switch_event(sched, evsel, sample, machine);
1687
1688	sched->curr_pid[this_cpu] = next_pid;
1689	return err;
1690}
1691
1692static int process_sched_runtime_event(struct perf_tool *tool,
1693				       struct evsel *evsel,
1694				       struct perf_sample *sample,
1695				       struct machine *machine)
1696{
1697	struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
1698
1699	if (sched->tp_handler->runtime_event)
1700		return sched->tp_handler->runtime_event(sched, evsel, sample, machine);
1701
1702	return 0;
1703}
1704
1705static int perf_sched__process_fork_event(struct perf_tool *tool,
1706					  union perf_event *event,
1707					  struct perf_sample *sample,
1708					  struct machine *machine)
1709{
1710	struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
1711
1712	/* run the fork event through the perf machineruy */
1713	perf_event__process_fork(tool, event, sample, machine);
1714
1715	/* and then run additional processing needed for this command */
1716	if (sched->tp_handler->fork_event)
1717		return sched->tp_handler->fork_event(sched, event, machine);
1718
1719	return 0;
1720}
1721
1722static int process_sched_migrate_task_event(struct perf_tool *tool,
1723					    struct evsel *evsel,
1724					    struct perf_sample *sample,
1725					    struct machine *machine)
1726{
1727	struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
1728
1729	if (sched->tp_handler->migrate_task_event)
1730		return sched->tp_handler->migrate_task_event(sched, evsel, sample, machine);
1731
1732	return 0;
1733}
1734
1735typedef int (*tracepoint_handler)(struct perf_tool *tool,
1736				  struct evsel *evsel,
1737				  struct perf_sample *sample,
1738				  struct machine *machine);
1739
1740static int perf_sched__process_tracepoint_sample(struct perf_tool *tool __maybe_unused,
1741						 union perf_event *event __maybe_unused,
1742						 struct perf_sample *sample,
1743						 struct evsel *evsel,
1744						 struct machine *machine)
1745{
1746	int err = 0;
1747
1748	if (evsel->handler != NULL) {
1749		tracepoint_handler f = evsel->handler;
1750		err = f(tool, evsel, sample, machine);
1751	}
1752
1753	return err;
1754}
1755
1756static int perf_sched__process_comm(struct perf_tool *tool __maybe_unused,
1757				    union perf_event *event,
1758				    struct perf_sample *sample,
1759				    struct machine *machine)
1760{
1761	struct thread *thread;
1762	struct thread_runtime *tr;
1763	int err;
1764
1765	err = perf_event__process_comm(tool, event, sample, machine);
1766	if (err)
1767		return err;
1768
1769	thread = machine__find_thread(machine, sample->pid, sample->tid);
1770	if (!thread) {
1771		pr_err("Internal error: can't find thread\n");
1772		return -1;
1773	}
1774
1775	tr = thread__get_runtime(thread);
1776	if (tr == NULL) {
1777		thread__put(thread);
1778		return -1;
1779	}
1780
1781	tr->comm_changed = true;
1782	thread__put(thread);
1783
1784	return 0;
1785}
1786
1787static int perf_sched__read_events(struct perf_sched *sched)
1788{
1789	const struct evsel_str_handler handlers[] = {
1790		{ "sched:sched_switch",	      process_sched_switch_event, },
1791		{ "sched:sched_stat_runtime", process_sched_runtime_event, },
1792		{ "sched:sched_wakeup",	      process_sched_wakeup_event, },
1793		{ "sched:sched_wakeup_new",   process_sched_wakeup_event, },
1794		{ "sched:sched_migrate_task", process_sched_migrate_task_event, },
1795	};
1796	struct perf_session *session;
1797	struct perf_data data = {
1798		.path  = input_name,
1799		.mode  = PERF_DATA_MODE_READ,
1800		.force = sched->force,
1801	};
1802	int rc = -1;
1803
1804	session = perf_session__new(&data, false, &sched->tool);
1805	if (IS_ERR(session)) {
1806		pr_debug("Error creating perf session");
1807		return PTR_ERR(session);
1808	}
1809
1810	symbol__init(&session->header.env);
1811
1812	if (perf_session__set_tracepoints_handlers(session, handlers))
1813		goto out_delete;
1814
1815	if (perf_session__has_traces(session, "record -R")) {
1816		int err = perf_session__process_events(session);
1817		if (err) {
1818			pr_err("Failed to process events, error %d", err);
1819			goto out_delete;
1820		}
1821
1822		sched->nr_events      = session->evlist->stats.nr_events[0];
1823		sched->nr_lost_events = session->evlist->stats.total_lost;
1824		sched->nr_lost_chunks = session->evlist->stats.nr_events[PERF_RECORD_LOST];
1825	}
1826
1827	rc = 0;
1828out_delete:
1829	perf_session__delete(session);
1830	return rc;
1831}
1832
1833/*
1834 * scheduling times are printed as msec.usec
1835 */
1836static inline void print_sched_time(unsigned long long nsecs, int width)
1837{
1838	unsigned long msecs;
1839	unsigned long usecs;
1840
1841	msecs  = nsecs / NSEC_PER_MSEC;
1842	nsecs -= msecs * NSEC_PER_MSEC;
1843	usecs  = nsecs / NSEC_PER_USEC;
1844	printf("%*lu.%03lu ", width, msecs, usecs);
1845}
1846
1847/*
1848 * returns runtime data for event, allocating memory for it the
1849 * first time it is used.
1850 */
1851static struct evsel_runtime *evsel__get_runtime(struct evsel *evsel)
1852{
1853	struct evsel_runtime *r = evsel->priv;
1854
1855	if (r == NULL) {
1856		r = zalloc(sizeof(struct evsel_runtime));
1857		evsel->priv = r;
1858	}
1859
1860	return r;
1861}
1862
1863/*
1864 * save last time event was seen per cpu
1865 */
1866static void evsel__save_time(struct evsel *evsel, u64 timestamp, u32 cpu)
1867{
1868	struct evsel_runtime *r = evsel__get_runtime(evsel);
1869
1870	if (r == NULL)
1871		return;
1872
1873	if ((cpu >= r->ncpu) || (r->last_time == NULL)) {
1874		int i, n = __roundup_pow_of_two(cpu+1);
1875		void *p = r->last_time;
1876
1877		p = realloc(r->last_time, n * sizeof(u64));
1878		if (!p)
1879			return;
1880
1881		r->last_time = p;
1882		for (i = r->ncpu; i < n; ++i)
1883			r->last_time[i] = (u64) 0;
1884
1885		r->ncpu = n;
1886	}
1887
1888	r->last_time[cpu] = timestamp;
1889}
1890
1891/* returns last time this event was seen on the given cpu */
1892static u64 evsel__get_time(struct evsel *evsel, u32 cpu)
1893{
1894	struct evsel_runtime *r = evsel__get_runtime(evsel);
1895
1896	if ((r == NULL) || (r->last_time == NULL) || (cpu >= r->ncpu))
1897		return 0;
1898
1899	return r->last_time[cpu];
1900}
1901
1902static int comm_width = 30;
1903
1904static char *timehist_get_commstr(struct thread *thread)
1905{
1906	static char str[32];
1907	const char *comm = thread__comm_str(thread);
1908	pid_t tid = thread->tid;
1909	pid_t pid = thread->pid_;
1910	int n;
1911
1912	if (pid == 0)
1913		n = scnprintf(str, sizeof(str), "%s", comm);
1914
1915	else if (tid != pid)
1916		n = scnprintf(str, sizeof(str), "%s[%d/%d]", comm, tid, pid);
1917
1918	else
1919		n = scnprintf(str, sizeof(str), "%s[%d]", comm, tid);
1920
1921	if (n > comm_width)
1922		comm_width = n;
1923
1924	return str;
1925}
1926
1927static void timehist_header(struct perf_sched *sched)
1928{
1929	u32 ncpus = sched->max_cpu + 1;
1930	u32 i, j;
1931
1932	printf("%15s %6s ", "time", "cpu");
1933
1934	if (sched->show_cpu_visual) {
1935		printf(" ");
1936		for (i = 0, j = 0; i < ncpus; ++i) {
1937			printf("%x", j++);
1938			if (j > 15)
1939				j = 0;
1940		}
1941		printf(" ");
1942	}
1943
1944	printf(" %-*s  %9s  %9s  %9s", comm_width,
1945		"task name", "wait time", "sch delay", "run time");
1946
1947	if (sched->show_state)
1948		printf("  %s", "state");
1949
1950	printf("\n");
1951
1952	/*
1953	 * units row
1954	 */
1955	printf("%15s %-6s ", "", "");
1956
1957	if (sched->show_cpu_visual)
1958		printf(" %*s ", ncpus, "");
1959
1960	printf(" %-*s  %9s  %9s  %9s", comm_width,
1961	       "[tid/pid]", "(msec)", "(msec)", "(msec)");
1962
1963	if (sched->show_state)
1964		printf("  %5s", "");
1965
1966	printf("\n");
1967
1968	/*
1969	 * separator
1970	 */
1971	printf("%.15s %.6s ", graph_dotted_line, graph_dotted_line);
1972
1973	if (sched->show_cpu_visual)
1974		printf(" %.*s ", ncpus, graph_dotted_line);
1975
1976	printf(" %.*s  %.9s  %.9s  %.9s", comm_width,
1977		graph_dotted_line, graph_dotted_line, graph_dotted_line,
1978		graph_dotted_line);
1979
1980	if (sched->show_state)
1981		printf("  %.5s", graph_dotted_line);
1982
1983	printf("\n");
1984}
1985
1986static char task_state_char(struct thread *thread, int state)
1987{
1988	static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
1989	unsigned bit = state ? ffs(state) : 0;
1990
1991	/* 'I' for idle */
1992	if (thread->tid == 0)
1993		return 'I';
1994
1995	return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
1996}
1997
1998static void timehist_print_sample(struct perf_sched *sched,
1999				  struct evsel *evsel,
2000				  struct perf_sample *sample,
2001				  struct addr_location *al,
2002				  struct thread *thread,
2003				  u64 t, int state)
2004{
2005	struct thread_runtime *tr = thread__priv(thread);
2006	const char *next_comm = evsel__strval(evsel, sample, "next_comm");
2007	const u32 next_pid = evsel__intval(evsel, sample, "next_pid");
2008	u32 max_cpus = sched->max_cpu + 1;
2009	char tstr[64];
2010	char nstr[30];
2011	u64 wait_time;
2012
2013	if (cpu_list && !test_bit(sample->cpu, cpu_bitmap))
2014		return;
2015
2016	timestamp__scnprintf_usec(t, tstr, sizeof(tstr));
2017	printf("%15s [%04d] ", tstr, sample->cpu);
2018
2019	if (sched->show_cpu_visual) {
2020		u32 i;
2021		char c;
2022
2023		printf(" ");
2024		for (i = 0; i < max_cpus; ++i) {
2025			/* flag idle times with 'i'; others are sched events */
2026			if (i == sample->cpu)
2027				c = (thread->tid == 0) ? 'i' : 's';
2028			else
2029				c = ' ';
2030			printf("%c", c);
2031		}
2032		printf(" ");
2033	}
2034
2035	printf(" %-*s ", comm_width, timehist_get_commstr(thread));
2036
2037	wait_time = tr->dt_sleep + tr->dt_iowait + tr->dt_preempt;
2038	print_sched_time(wait_time, 6);
2039
2040	print_sched_time(tr->dt_delay, 6);
2041	print_sched_time(tr->dt_run, 6);
2042
2043	if (sched->show_state)
2044		printf(" %5c ", task_state_char(thread, state));
2045
2046	if (sched->show_next) {
2047		snprintf(nstr, sizeof(nstr), "next: %s[%d]", next_comm, next_pid);
2048		printf(" %-*s", comm_width, nstr);
2049	}
2050
2051	if (sched->show_wakeups && !sched->show_next)
2052		printf("  %-*s", comm_width, "");
2053
2054	if (thread->tid == 0)
2055		goto out;
2056
2057	if (sched->show_callchain)
2058		printf("  ");
2059
2060	sample__fprintf_sym(sample, al, 0,
2061			    EVSEL__PRINT_SYM | EVSEL__PRINT_ONELINE |
2062			    EVSEL__PRINT_CALLCHAIN_ARROW |
2063			    EVSEL__PRINT_SKIP_IGNORED,
2064			    &callchain_cursor, symbol_conf.bt_stop_list,  stdout);
2065
2066out:
2067	printf("\n");
2068}
2069
2070/*
2071 * Explanation of delta-time stats:
2072 *
2073 *            t = time of current schedule out event
2074 *        tprev = time of previous sched out event
2075 *                also time of schedule-in event for current task
2076 *    last_time = time of last sched change event for current task
2077 *                (i.e, time process was last scheduled out)
2078 * ready_to_run = time of wakeup for current task
2079 *
2080 * -----|------------|------------|------------|------
2081 *    last         ready        tprev          t
2082 *    time         to run
2083 *
2084 *      |-------- dt_wait --------|
2085 *                   |- dt_delay -|-- dt_run --|
2086 *
2087 *   dt_run = run time of current task
2088 *  dt_wait = time between last schedule out event for task and tprev
2089 *            represents time spent off the cpu
2090 * dt_delay = time between wakeup and schedule-in of task
2091 */
2092
2093static void timehist_update_runtime_stats(struct thread_runtime *r,
2094					 u64 t, u64 tprev)
2095{
2096	r->dt_delay   = 0;
2097	r->dt_sleep   = 0;
2098	r->dt_iowait  = 0;
2099	r->dt_preempt = 0;
2100	r->dt_run     = 0;
2101
2102	if (tprev) {
2103		r->dt_run = t - tprev;
2104		if (r->ready_to_run) {
2105			if (r->ready_to_run > tprev)
2106				pr_debug("time travel: wakeup time for task > previous sched_switch event\n");
2107			else
2108				r->dt_delay = tprev - r->ready_to_run;
2109		}
2110
2111		if (r->last_time > tprev)
2112			pr_debug("time travel: last sched out time for task > previous sched_switch event\n");
2113		else if (r->last_time) {
2114			u64 dt_wait = tprev - r->last_time;
2115
2116			if (r->last_state == TASK_RUNNING)
2117				r->dt_preempt = dt_wait;
2118			else if (r->last_state == TASK_UNINTERRUPTIBLE)
2119				r->dt_iowait = dt_wait;
2120			else
2121				r->dt_sleep = dt_wait;
2122		}
2123	}
2124
2125	update_stats(&r->run_stats, r->dt_run);
2126
2127	r->total_run_time     += r->dt_run;
2128	r->total_delay_time   += r->dt_delay;
2129	r->total_sleep_time   += r->dt_sleep;
2130	r->total_iowait_time  += r->dt_iowait;
2131	r->total_preempt_time += r->dt_preempt;
2132}
2133
2134static bool is_idle_sample(struct perf_sample *sample,
2135			   struct evsel *evsel)
2136{
2137	/* pid 0 == swapper == idle task */
2138	if (strcmp(evsel__name(evsel), "sched:sched_switch") == 0)
2139		return evsel__intval(evsel, sample, "prev_pid") == 0;
2140
2141	return sample->pid == 0;
2142}
2143
2144static void save_task_callchain(struct perf_sched *sched,
2145				struct perf_sample *sample,
2146				struct evsel *evsel,
2147				struct machine *machine)
2148{
2149	struct callchain_cursor *cursor = &callchain_cursor;
2150	struct thread *thread;
2151
2152	/* want main thread for process - has maps */
2153	thread = machine__findnew_thread(machine, sample->pid, sample->pid);
2154	if (thread == NULL) {
2155		pr_debug("Failed to get thread for pid %d.\n", sample->pid);
2156		return;
2157	}
2158
2159	if (!sched->show_callchain || sample->callchain == NULL)
2160		return;
2161
2162	if (thread__resolve_callchain(thread, cursor, evsel, sample,
2163				      NULL, NULL, sched->max_stack + 2) != 0) {
2164		if (verbose > 0)
2165			pr_err("Failed to resolve callchain. Skipping\n");
2166
2167		return;
2168	}
2169
2170	callchain_cursor_commit(cursor);
2171
2172	while (true) {
2173		struct callchain_cursor_node *node;
2174		struct symbol *sym;
2175
2176		node = callchain_cursor_current(cursor);
2177		if (node == NULL)
2178			break;
2179
2180		sym = node->ms.sym;
2181		if (sym) {
2182			if (!strcmp(sym->name, "schedule") ||
2183			    !strcmp(sym->name, "__schedule") ||
2184			    !strcmp(sym->name, "preempt_schedule"))
2185				sym->ignore = 1;
2186		}
2187
2188		callchain_cursor_advance(cursor);
2189	}
2190}
2191
2192static int init_idle_thread(struct thread *thread)
2193{
2194	struct idle_thread_runtime *itr;
2195
2196	thread__set_comm(thread, idle_comm, 0);
2197
2198	itr = zalloc(sizeof(*itr));
2199	if (itr == NULL)
2200		return -ENOMEM;
2201
2202	init_stats(&itr->tr.run_stats);
2203	callchain_init(&itr->callchain);
2204	callchain_cursor_reset(&itr->cursor);
2205	thread__set_priv(thread, itr);
2206
2207	return 0;
2208}
2209
2210/*
2211 * Track idle stats per cpu by maintaining a local thread
2212 * struct for the idle task on each cpu.
2213 */
2214static int init_idle_threads(int ncpu)
2215{
2216	int i, ret;
2217
2218	idle_threads = zalloc(ncpu * sizeof(struct thread *));
2219	if (!idle_threads)
2220		return -ENOMEM;
2221
2222	idle_max_cpu = ncpu;
2223
2224	/* allocate the actual thread struct if needed */
2225	for (i = 0; i < ncpu; ++i) {
2226		idle_threads[i] = thread__new(0, 0);
2227		if (idle_threads[i] == NULL)
2228			return -ENOMEM;
2229
2230		ret = init_idle_thread(idle_threads[i]);
2231		if (ret < 0)
2232			return ret;
2233	}
2234
2235	return 0;
2236}
2237
2238static void free_idle_threads(void)
2239{
2240	int i;
2241
2242	if (idle_threads == NULL)
2243		return;
2244
2245	for (i = 0; i < idle_max_cpu; ++i) {
2246		if ((idle_threads[i]))
2247			thread__delete(idle_threads[i]);
2248	}
2249
2250	free(idle_threads);
2251}
2252
2253static struct thread *get_idle_thread(int cpu)
2254{
2255	/*
2256	 * expand/allocate array of pointers to local thread
2257	 * structs if needed
2258	 */
2259	if ((cpu >= idle_max_cpu) || (idle_threads == NULL)) {
2260		int i, j = __roundup_pow_of_two(cpu+1);
2261		void *p;
2262
2263		p = realloc(idle_threads, j * sizeof(struct thread *));
2264		if (!p)
2265			return NULL;
2266
2267		idle_threads = (struct thread **) p;
2268		for (i = idle_max_cpu; i < j; ++i)
2269			idle_threads[i] = NULL;
2270
2271		idle_max_cpu = j;
2272	}
2273
2274	/* allocate a new thread struct if needed */
2275	if (idle_threads[cpu] == NULL) {
2276		idle_threads[cpu] = thread__new(0, 0);
2277
2278		if (idle_threads[cpu]) {
2279			if (init_idle_thread(idle_threads[cpu]) < 0)
2280				return NULL;
2281		}
2282	}
2283
2284	return idle_threads[cpu];
2285}
2286
2287static void save_idle_callchain(struct perf_sched *sched,
2288				struct idle_thread_runtime *itr,
2289				struct perf_sample *sample)
2290{
2291	if (!sched->show_callchain || sample->callchain == NULL)
2292		return;
2293
2294	callchain_cursor__copy(&itr->cursor, &callchain_cursor);
2295}
2296
2297static struct thread *timehist_get_thread(struct perf_sched *sched,
2298					  struct perf_sample *sample,
2299					  struct machine *machine,
2300					  struct evsel *evsel)
2301{
2302	struct thread *thread;
2303
2304	if (is_idle_sample(sample, evsel)) {
2305		thread = get_idle_thread(sample->cpu);
2306		if (thread == NULL)
2307			pr_err("Failed to get idle thread for cpu %d.\n", sample->cpu);
2308
2309	} else {
2310		/* there were samples with tid 0 but non-zero pid */
2311		thread = machine__findnew_thread(machine, sample->pid,
2312						 sample->tid ?: sample->pid);
2313		if (thread == NULL) {
2314			pr_debug("Failed to get thread for tid %d. skipping sample.\n",
2315				 sample->tid);
2316		}
2317
2318		save_task_callchain(sched, sample, evsel, machine);
2319		if (sched->idle_hist) {
2320			struct thread *idle;
2321			struct idle_thread_runtime *itr;
2322
2323			idle = get_idle_thread(sample->cpu);
2324			if (idle == NULL) {
2325				pr_err("Failed to get idle thread for cpu %d.\n", sample->cpu);
2326				return NULL;
2327			}
2328
2329			itr = thread__priv(idle);
2330			if (itr == NULL)
2331				return NULL;
2332
2333			itr->last_thread = thread;
2334
2335			/* copy task callchain when entering to idle */
2336			if (evsel__intval(evsel, sample, "next_pid") == 0)
2337				save_idle_callchain(sched, itr, sample);
2338		}
2339	}
2340
2341	return thread;
2342}
2343
2344static bool timehist_skip_sample(struct perf_sched *sched,
2345				 struct thread *thread,
2346				 struct evsel *evsel,
2347				 struct perf_sample *sample)
2348{
2349	bool rc = false;
2350
2351	if (thread__is_filtered(thread)) {
2352		rc = true;
2353		sched->skipped_samples++;
2354	}
2355
2356	if (sched->idle_hist) {
2357		if (strcmp(evsel__name(evsel), "sched:sched_switch"))
2358			rc = true;
2359		else if (evsel__intval(evsel, sample, "prev_pid") != 0 &&
2360			 evsel__intval(evsel, sample, "next_pid") != 0)
2361			rc = true;
2362	}
2363
2364	return rc;
2365}
2366
2367static void timehist_print_wakeup_event(struct perf_sched *sched,
2368					struct evsel *evsel,
2369					struct perf_sample *sample,
2370					struct machine *machine,
2371					struct thread *awakened)
2372{
2373	struct thread *thread;
2374	char tstr[64];
2375
2376	thread = machine__findnew_thread(machine, sample->pid, sample->tid);
2377	if (thread == NULL)
2378		return;
2379
2380	/* show wakeup unless both awakee and awaker are filtered */
2381	if (timehist_skip_sample(sched, thread, evsel, sample) &&
2382	    timehist_skip_sample(sched, awakened, evsel, sample)) {
2383		return;
2384	}
2385
2386	timestamp__scnprintf_usec(sample->time, tstr, sizeof(tstr));
2387	printf("%15s [%04d] ", tstr, sample->cpu);
2388	if (sched->show_cpu_visual)
2389		printf(" %*s ", sched->max_cpu + 1, "");
2390
2391	printf(" %-*s ", comm_width, timehist_get_commstr(thread));
2392
2393	/* dt spacer */
2394	printf("  %9s  %9s  %9s ", "", "", "");
2395
2396	printf("awakened: %s", timehist_get_commstr(awakened));
2397
2398	printf("\n");
2399}
2400
2401static int timehist_sched_wakeup_ignore(struct perf_tool *tool __maybe_unused,
2402					union perf_event *event __maybe_unused,
2403					struct evsel *evsel __maybe_unused,
2404					struct perf_sample *sample __maybe_unused,
2405					struct machine *machine __maybe_unused)
2406{
2407	return 0;
2408}
2409
2410static int timehist_sched_wakeup_event(struct perf_tool *tool,
2411				       union perf_event *event __maybe_unused,
2412				       struct evsel *evsel,
2413				       struct perf_sample *sample,
2414				       struct machine *machine)
2415{
2416	struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
2417	struct thread *thread;
2418	struct thread_runtime *tr = NULL;
2419	/* want pid of awakened task not pid in sample */
2420	const u32 pid = evsel__intval(evsel, sample, "pid");
2421
2422	thread = machine__findnew_thread(machine, 0, pid);
2423	if (thread == NULL)
2424		return -1;
2425
2426	tr = thread__get_runtime(thread);
2427	if (tr == NULL)
2428		return -1;
2429
2430	if (tr->ready_to_run == 0)
2431		tr->ready_to_run = sample->time;
2432
2433	/* show wakeups if requested */
2434	if (sched->show_wakeups &&
2435	    !perf_time__skip_sample(&sched->ptime, sample->time))
2436		timehist_print_wakeup_event(sched, evsel, sample, machine, thread);
2437
2438	return 0;
2439}
2440
2441static void timehist_print_migration_event(struct perf_sched *sched,
2442					struct evsel *evsel,
2443					struct perf_sample *sample,
2444					struct machine *machine,
2445					struct thread *migrated)
2446{
2447	struct thread *thread;
2448	char tstr[64];
2449	u32 max_cpus = sched->max_cpu + 1;
2450	u32 ocpu, dcpu;
2451
2452	if (sched->summary_only)
2453		return;
2454
2455	max_cpus = sched->max_cpu + 1;
2456	ocpu = evsel__intval(evsel, sample, "orig_cpu");
2457	dcpu = evsel__intval(evsel, sample, "dest_cpu");
2458
2459	thread = machine__findnew_thread(machine, sample->pid, sample->tid);
2460	if (thread == NULL)
2461		return;
2462
2463	if (timehist_skip_sample(sched, thread, evsel, sample) &&
2464	    timehist_skip_sample(sched, migrated, evsel, sample)) {
2465		return;
2466	}
2467
2468	timestamp__scnprintf_usec(sample->time, tstr, sizeof(tstr));
2469	printf("%15s [%04d] ", tstr, sample->cpu);
2470
2471	if (sched->show_cpu_visual) {
2472		u32 i;
2473		char c;
2474
2475		printf("  ");
2476		for (i = 0; i < max_cpus; ++i) {
2477			c = (i == sample->cpu) ? 'm' : ' ';
2478			printf("%c", c);
2479		}
2480		printf("  ");
2481	}
2482
2483	printf(" %-*s ", comm_width, timehist_get_commstr(thread));
2484
2485	/* dt spacer */
2486	printf("  %9s  %9s  %9s ", "", "", "");
2487
2488	printf("migrated: %s", timehist_get_commstr(migrated));
2489	printf(" cpu %d => %d", ocpu, dcpu);
2490
2491	printf("\n");
2492}
2493
2494static int timehist_migrate_task_event(struct perf_tool *tool,
2495				       union perf_event *event __maybe_unused,
2496				       struct evsel *evsel,
2497				       struct perf_sample *sample,
2498				       struct machine *machine)
2499{
2500	struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
2501	struct thread *thread;
2502	struct thread_runtime *tr = NULL;
2503	/* want pid of migrated task not pid in sample */
2504	const u32 pid = evsel__intval(evsel, sample, "pid");
2505
2506	thread = machine__findnew_thread(machine, 0, pid);
2507	if (thread == NULL)
2508		return -1;
2509
2510	tr = thread__get_runtime(thread);
2511	if (tr == NULL)
2512		return -1;
2513
2514	tr->migrations++;
2515
2516	/* show migrations if requested */
2517	timehist_print_migration_event(sched, evsel, sample, machine, thread);
2518
2519	return 0;
2520}
2521
2522static int timehist_sched_change_event(struct perf_tool *tool,
2523				       union perf_event *event,
2524				       struct evsel *evsel,
2525				       struct perf_sample *sample,
2526				       struct machine *machine)
2527{
2528	struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
2529	struct perf_time_interval *ptime = &sched->ptime;
2530	struct addr_location al;
2531	struct thread *thread;
2532	struct thread_runtime *tr = NULL;
2533	u64 tprev, t = sample->time;
2534	int rc = 0;
2535	int state = evsel__intval(evsel, sample, "prev_state");
2536
2537	if (machine__resolve(machine, &al, sample) < 0) {
2538		pr_err("problem processing %d event. skipping it\n",
2539		       event->header.type);
2540		rc = -1;
2541		goto out;
2542	}
2543
2544	thread = timehist_get_thread(sched, sample, machine, evsel);
2545	if (thread == NULL) {
2546		rc = -1;
2547		goto out;
2548	}
2549
2550	if (timehist_skip_sample(sched, thread, evsel, sample))
2551		goto out;
2552
2553	tr = thread__get_runtime(thread);
2554	if (tr == NULL) {
2555		rc = -1;
2556		goto out;
2557	}
2558
2559	tprev = evsel__get_time(evsel, sample->cpu);
2560
2561	/*
2562	 * If start time given:
2563	 * - sample time is under window user cares about - skip sample
2564	 * - tprev is under window user cares about  - reset to start of window
2565	 */
2566	if (ptime->start && ptime->start > t)
2567		goto out;
2568
2569	if (tprev && ptime->start > tprev)
2570		tprev = ptime->start;
2571
2572	/*
2573	 * If end time given:
2574	 * - previous sched event is out of window - we are done
2575	 * - sample time is beyond window user cares about - reset it
2576	 *   to close out stats for time window interest
2577	 */
2578	if (ptime->end) {
2579		if (tprev > ptime->end)
2580			goto out;
2581
2582		if (t > ptime->end)
2583			t = ptime->end;
2584	}
2585
2586	if (!sched->idle_hist || thread->tid == 0) {
2587		if (!cpu_list || test_bit(sample->cpu, cpu_bitmap))
2588			timehist_update_runtime_stats(tr, t, tprev);
2589
2590		if (sched->idle_hist) {
2591			struct idle_thread_runtime *itr = (void *)tr;
2592			struct thread_runtime *last_tr;
2593
2594			BUG_ON(thread->tid != 0);
2595
2596			if (itr->last_thread == NULL)
2597				goto out;
2598
2599			/* add current idle time as last thread's runtime */
2600			last_tr = thread__get_runtime(itr->last_thread);
2601			if (last_tr == NULL)
2602				goto out;
2603
2604			timehist_update_runtime_stats(last_tr, t, tprev);
2605			/*
2606			 * remove delta time of last thread as it's not updated
2607			 * and otherwise it will show an invalid value next
2608			 * time.  we only care total run time and run stat.
2609			 */
2610			last_tr->dt_run = 0;
2611			last_tr->dt_delay = 0;
2612			last_tr->dt_sleep = 0;
2613			last_tr->dt_iowait = 0;
2614			last_tr->dt_preempt = 0;
2615
2616			if (itr->cursor.nr)
2617				callchain_append(&itr->callchain, &itr->cursor, t - tprev);
2618
2619			itr->last_thread = NULL;
2620		}
2621	}
2622
2623	if (!sched->summary_only)
2624		timehist_print_sample(sched, evsel, sample, &al, thread, t, state);
2625
2626out:
2627	if (sched->hist_time.start == 0 && t >= ptime->start)
2628		sched->hist_time.start = t;
2629	if (ptime->end == 0 || t <= ptime->end)
2630		sched->hist_time.end = t;
2631
2632	if (tr) {
2633		/* time of this sched_switch event becomes last time task seen */
2634		tr->last_time = sample->time;
2635
2636		/* last state is used to determine where to account wait time */
2637		tr->last_state = state;
2638
2639		/* sched out event for task so reset ready to run time */
2640		tr->ready_to_run = 0;
2641	}
2642
2643	evsel__save_time(evsel, sample->time, sample->cpu);
2644
2645	return rc;
2646}
2647
2648static int timehist_sched_switch_event(struct perf_tool *tool,
2649			     union perf_event *event,
2650			     struct evsel *evsel,
2651			     struct perf_sample *sample,
2652			     struct machine *machine __maybe_unused)
2653{
2654	return timehist_sched_change_event(tool, event, evsel, sample, machine);
2655}
2656
2657static int process_lost(struct perf_tool *tool __maybe_unused,
2658			union perf_event *event,
2659			struct perf_sample *sample,
2660			struct machine *machine __maybe_unused)
2661{
2662	char tstr[64];
2663
2664	timestamp__scnprintf_usec(sample->time, tstr, sizeof(tstr));
2665	printf("%15s ", tstr);
2666	printf("lost %" PRI_lu64 " events on cpu %d\n", event->lost.lost, sample->cpu);
2667
2668	return 0;
2669}
2670
2671
2672static void print_thread_runtime(struct thread *t,
2673				 struct thread_runtime *r)
2674{
2675	double mean = avg_stats(&r->run_stats);
2676	float stddev;
2677
2678	printf("%*s   %5d  %9" PRIu64 " ",
2679	       comm_width, timehist_get_commstr(t), t->ppid,
2680	       (u64) r->run_stats.n);
2681
2682	print_sched_time(r->total_run_time, 8);
2683	stddev = rel_stddev_stats(stddev_stats(&r->run_stats), mean);
2684	print_sched_time(r->run_stats.min, 6);
2685	printf(" ");
2686	print_sched_time((u64) mean, 6);
2687	printf(" ");
2688	print_sched_time(r->run_stats.max, 6);
2689	printf("  ");
2690	printf("%5.2f", stddev);
2691	printf("   %5" PRIu64, r->migrations);
2692	printf("\n");
2693}
2694
2695static void print_thread_waittime(struct thread *t,
2696				  struct thread_runtime *r)
2697{
2698	printf("%*s   %5d  %9" PRIu64 " ",
2699	       comm_width, timehist_get_commstr(t), t->ppid,
2700	       (u64) r->run_stats.n);
2701
2702	print_sched_time(r->total_run_time, 8);
2703	print_sched_time(r->total_sleep_time, 6);
2704	printf(" ");
2705	print_sched_time(r->total_iowait_time, 6);
2706	printf(" ");
2707	print_sched_time(r->total_preempt_time, 6);
2708	printf(" ");
2709	print_sched_time(r->total_delay_time, 6);
2710	printf("\n");
2711}
2712
2713struct total_run_stats {
2714	struct perf_sched *sched;
2715	u64  sched_count;
2716	u64  task_count;
2717	u64  total_run_time;
2718};
2719
2720static int __show_thread_runtime(struct thread *t, void *priv)
2721{
2722	struct total_run_stats *stats = priv;
2723	struct thread_runtime *r;
2724
2725	if (thread__is_filtered(t))
2726		return 0;
2727
2728	r = thread__priv(t);
2729	if (r && r->run_stats.n) {
2730		stats->task_count++;
2731		stats->sched_count += r->run_stats.n;
2732		stats->total_run_time += r->total_run_time;
2733
2734		if (stats->sched->show_state)
2735			print_thread_waittime(t, r);
2736		else
2737			print_thread_runtime(t, r);
2738	}
2739
2740	return 0;
2741}
2742
2743static int show_thread_runtime(struct thread *t, void *priv)
2744{
2745	if (t->dead)
2746		return 0;
2747
2748	return __show_thread_runtime(t, priv);
2749}
2750
2751static int show_deadthread_runtime(struct thread *t, void *priv)
2752{
2753	if (!t->dead)
2754		return 0;
2755
2756	return __show_thread_runtime(t, priv);
2757}
2758
2759static size_t callchain__fprintf_folded(FILE *fp, struct callchain_node *node)
2760{
2761	const char *sep = " <- ";
2762	struct callchain_list *chain;
2763	size_t ret = 0;
2764	char bf[1024];
2765	bool first;
2766
2767	if (node == NULL)
2768		return 0;
2769
2770	ret = callchain__fprintf_folded(fp, node->parent);
2771	first = (ret == 0);
2772
2773	list_for_each_entry(chain, &node->val, list) {
2774		if (chain->ip >= PERF_CONTEXT_MAX)
2775			continue;
2776		if (chain->ms.sym && chain->ms.sym->ignore)
2777			continue;
2778		ret += fprintf(fp, "%s%s", first ? "" : sep,
2779			       callchain_list__sym_name(chain, bf, sizeof(bf),
2780							false));
2781		first = false;
2782	}
2783
2784	return ret;
2785}
2786
2787static size_t timehist_print_idlehist_callchain(struct rb_root_cached *root)
2788{
2789	size_t ret = 0;
2790	FILE *fp = stdout;
2791	struct callchain_node *chain;
2792	struct rb_node *rb_node = rb_first_cached(root);
2793
2794	printf("  %16s  %8s  %s\n", "Idle time (msec)", "Count", "Callchains");
2795	printf("  %.16s  %.8s  %.50s\n", graph_dotted_line, graph_dotted_line,
2796	       graph_dotted_line);
2797
2798	while (rb_node) {
2799		chain = rb_entry(rb_node, struct callchain_node, rb_node);
2800		rb_node = rb_next(rb_node);
2801
2802		ret += fprintf(fp, "  ");
2803		print_sched_time(chain->hit, 12);
2804		ret += 16;  /* print_sched_time returns 2nd arg + 4 */
2805		ret += fprintf(fp, " %8d  ", chain->count);
2806		ret += callchain__fprintf_folded(fp, chain);
2807		ret += fprintf(fp, "\n");
2808	}
2809
2810	return ret;
2811}
2812
2813static void timehist_print_summary(struct perf_sched *sched,
2814				   struct perf_session *session)
2815{
2816	struct machine *m = &session->machines.host;
2817	struct total_run_stats totals;
2818	u64 task_count;
2819	struct thread *t;
2820	struct thread_runtime *r;
2821	int i;
2822	u64 hist_time = sched->hist_time.end - sched->hist_time.start;
2823
2824	memset(&totals, 0, sizeof(totals));
2825	totals.sched = sched;
2826
2827	if (sched->idle_hist) {
2828		printf("\nIdle-time summary\n");
2829		printf("%*s  parent  sched-out  ", comm_width, "comm");
2830		printf("  idle-time   min-idle    avg-idle    max-idle  stddev  migrations\n");
2831	} else if (sched->show_state) {
2832		printf("\nWait-time summary\n");
2833		printf("%*s  parent   sched-in  ", comm_width, "comm");
2834		printf("   run-time      sleep      iowait     preempt       delay\n");
2835	} else {
2836		printf("\nRuntime summary\n");
2837		printf("%*s  parent   sched-in  ", comm_width, "comm");
2838		printf("   run-time    min-run     avg-run     max-run  stddev  migrations\n");
2839	}
2840	printf("%*s            (count)  ", comm_width, "");
2841	printf("     (msec)     (msec)      (msec)      (msec)       %s\n",
2842	       sched->show_state ? "(msec)" : "%");
2843	printf("%.117s\n", graph_dotted_line);
2844
2845	machine__for_each_thread(m, show_thread_runtime, &totals);
2846	task_count = totals.task_count;
2847	if (!task_count)
2848		printf("<no still running tasks>\n");
2849
2850	printf("\nTerminated tasks:\n");
2851	machine__for_each_thread(m, show_deadthread_runtime, &totals);
2852	if (task_count == totals.task_count)
2853		printf("<no terminated tasks>\n");
2854
2855	/* CPU idle stats not tracked when samples were skipped */
2856	if (sched->skipped_samples && !sched->idle_hist)
2857		return;
2858
2859	printf("\nIdle stats:\n");
2860	for (i = 0; i < idle_max_cpu; ++i) {
2861		if (cpu_list && !test_bit(i, cpu_bitmap))
2862			continue;
2863
2864		t = idle_threads[i];
2865		if (!t)
2866			continue;
2867
2868		r = thread__priv(t);
2869		if (r && r->run_stats.n) {
2870			totals.sched_count += r->run_stats.n;
2871			printf("    CPU %2d idle for ", i);
2872			print_sched_time(r->total_run_time, 6);
2873			printf(" msec  (%6.2f%%)\n", 100.0 * r->total_run_time / hist_time);
2874		} else
2875			printf("    CPU %2d idle entire time window\n", i);
2876	}
2877
2878	if (sched->idle_hist && sched->show_callchain) {
2879		callchain_param.mode  = CHAIN_FOLDED;
2880		callchain_param.value = CCVAL_PERIOD;
2881
2882		callchain_register_param(&callchain_param);
2883
2884		printf("\nIdle stats by callchain:\n");
2885		for (i = 0; i < idle_max_cpu; ++i) {
2886			struct idle_thread_runtime *itr;
2887
2888			t = idle_threads[i];
2889			if (!t)
2890				continue;
2891
2892			itr = thread__priv(t);
2893			if (itr == NULL)
2894				continue;
2895
2896			callchain_param.sort(&itr->sorted_root.rb_root, &itr->callchain,
2897					     0, &callchain_param);
2898
2899			printf("  CPU %2d:", i);
2900			print_sched_time(itr->tr.total_run_time, 6);
2901			printf(" msec\n");
2902			timehist_print_idlehist_callchain(&itr->sorted_root);
2903			printf("\n");
2904		}
2905	}
2906
2907	printf("\n"
2908	       "    Total number of unique tasks: %" PRIu64 "\n"
2909	       "Total number of context switches: %" PRIu64 "\n",
2910	       totals.task_count, totals.sched_count);
2911
2912	printf("           Total run time (msec): ");
2913	print_sched_time(totals.total_run_time, 2);
2914	printf("\n");
2915
2916	printf("    Total scheduling time (msec): ");
2917	print_sched_time(hist_time, 2);
2918	printf(" (x %d)\n", sched->max_cpu);
2919}
2920
2921typedef int (*sched_handler)(struct perf_tool *tool,
2922			  union perf_event *event,
2923			  struct evsel *evsel,
2924			  struct perf_sample *sample,
2925			  struct machine *machine);
2926
2927static int perf_timehist__process_sample(struct perf_tool *tool,
2928					 union perf_event *event,
2929					 struct perf_sample *sample,
2930					 struct evsel *evsel,
2931					 struct machine *machine)
2932{
2933	struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
2934	int err = 0;
2935	int this_cpu = sample->cpu;
2936
2937	if (this_cpu > sched->max_cpu)
2938		sched->max_cpu = this_cpu;
2939
2940	if (evsel->handler != NULL) {
2941		sched_handler f = evsel->handler;
2942
2943		err = f(tool, event, evsel, sample, machine);
2944	}
2945
2946	return err;
2947}
2948
2949static int timehist_check_attr(struct perf_sched *sched,
2950			       struct evlist *evlist)
2951{
2952	struct evsel *evsel;
2953	struct evsel_runtime *er;
2954
2955	list_for_each_entry(evsel, &evlist->core.entries, core.node) {
2956		er = evsel__get_runtime(evsel);
2957		if (er == NULL) {
2958			pr_err("Failed to allocate memory for evsel runtime data\n");
2959			return -1;
2960		}
2961
2962		if (sched->show_callchain && !evsel__has_callchain(evsel)) {
2963			pr_info("Samples do not have callchains.\n");
2964			sched->show_callchain = 0;
2965			symbol_conf.use_callchain = 0;
2966		}
2967	}
2968
2969	return 0;
2970}
2971
2972static int perf_sched__timehist(struct perf_sched *sched)
2973{
2974	struct evsel_str_handler handlers[] = {
2975		{ "sched:sched_switch",       timehist_sched_switch_event, },
2976		{ "sched:sched_wakeup",	      timehist_sched_wakeup_event, },
2977		{ "sched:sched_waking",       timehist_sched_wakeup_event, },
2978		{ "sched:sched_wakeup_new",   timehist_sched_wakeup_event, },
2979	};
2980	const struct evsel_str_handler migrate_handlers[] = {
2981		{ "sched:sched_migrate_task", timehist_migrate_task_event, },
2982	};
2983	struct perf_data data = {
2984		.path  = input_name,
2985		.mode  = PERF_DATA_MODE_READ,
2986		.force = sched->force,
2987	};
2988
2989	struct perf_session *session;
2990	struct evlist *evlist;
2991	int err = -1;
2992
2993	/*
2994	 * event handlers for timehist option
2995	 */
2996	sched->tool.sample	 = perf_timehist__process_sample;
2997	sched->tool.mmap	 = perf_event__process_mmap;
2998	sched->tool.comm	 = perf_event__process_comm;
2999	sched->tool.exit	 = perf_event__process_exit;
3000	sched->tool.fork	 = perf_event__process_fork;
3001	sched->tool.lost	 = process_lost;
3002	sched->tool.attr	 = perf_event__process_attr;
3003	sched->tool.tracing_data = perf_event__process_tracing_data;
3004	sched->tool.build_id	 = perf_event__process_build_id;
3005
3006	sched->tool.ordered_events = true;
3007	sched->tool.ordering_requires_timestamps = true;
3008
3009	symbol_conf.use_callchain = sched->show_callchain;
3010
3011	session = perf_session__new(&data, false, &sched->tool);
3012	if (IS_ERR(session))
3013		return PTR_ERR(session);
3014
3015	if (cpu_list) {
3016		err = perf_session__cpu_bitmap(session, cpu_list, cpu_bitmap);
3017		if (err < 0)
3018			goto out;
3019	}
3020
3021	evlist = session->evlist;
3022
3023	symbol__init(&session->header.env);
3024
3025	if (perf_time__parse_str(&sched->ptime, sched->time_str) != 0) {
3026		pr_err("Invalid time string\n");
3027		return -EINVAL;
3028	}
3029
3030	if (timehist_check_attr(sched, evlist) != 0)
3031		goto out;
3032
3033	setup_pager();
3034
3035	/* prefer sched_waking if it is captured */
3036	if (perf_evlist__find_tracepoint_by_name(session->evlist,
3037						  "sched:sched_waking"))
3038		handlers[1].handler = timehist_sched_wakeup_ignore;
3039
3040	/* setup per-evsel handlers */
3041	if (perf_session__set_tracepoints_handlers(session, handlers))
3042		goto out;
3043
3044	/* sched_switch event at a minimum needs to exist */
3045	if (!perf_evlist__find_tracepoint_by_name(session->evlist,
3046						  "sched:sched_switch")) {
3047		pr_err("No sched_switch events found. Have you run 'perf sched record'?\n");
3048		goto out;
3049	}
3050
3051	if (sched->show_migrations &&
3052	    perf_session__set_tracepoints_handlers(session, migrate_handlers))
3053		goto out;
3054
3055	/* pre-allocate struct for per-CPU idle stats */
3056	sched->max_cpu = session->header.env.nr_cpus_online;
3057	if (sched->max_cpu == 0)
3058		sched->max_cpu = 4;
3059	if (init_idle_threads(sched->max_cpu))
3060		goto out;
3061
3062	/* summary_only implies summary option, but don't overwrite summary if set */
3063	if (sched->summary_only)
3064		sched->summary = sched->summary_only;
3065
3066	if (!sched->summary_only)
3067		timehist_header(sched);
3068
3069	err = perf_session__process_events(session);
3070	if (err) {
3071		pr_err("Failed to process events, error %d", err);
3072		goto out;
3073	}
3074
3075	sched->nr_events      = evlist->stats.nr_events[0];
3076	sched->nr_lost_events = evlist->stats.total_lost;
3077	sched->nr_lost_chunks = evlist->stats.nr_events[PERF_RECORD_LOST];
3078
3079	if (sched->summary)
3080		timehist_print_summary(sched, session);
3081
3082out:
3083	free_idle_threads();
3084	perf_session__delete(session);
3085
3086	return err;
3087}
3088
3089
3090static void print_bad_events(struct perf_sched *sched)
3091{
3092	if (sched->nr_unordered_timestamps && sched->nr_timestamps) {
3093		printf("  INFO: %.3f%% unordered timestamps (%ld out of %ld)\n",
3094			(double)sched->nr_unordered_timestamps/(double)sched->nr_timestamps*100.0,
3095			sched->nr_unordered_timestamps, sched->nr_timestamps);
3096	}
3097	if (sched->nr_lost_events && sched->nr_events) {
3098		printf("  INFO: %.3f%% lost events (%ld out of %ld, in %ld chunks)\n",
3099			(double)sched->nr_lost_events/(double)sched->nr_events * 100.0,
3100			sched->nr_lost_events, sched->nr_events, sched->nr_lost_chunks);
3101	}
3102	if (sched->nr_context_switch_bugs && sched->nr_timestamps) {
3103		printf("  INFO: %.3f%% context switch bugs (%ld out of %ld)",
3104			(double)sched->nr_context_switch_bugs/(double)sched->nr_timestamps*100.0,
3105			sched->nr_context_switch_bugs, sched->nr_timestamps);
3106		if (sched->nr_lost_events)
3107			printf(" (due to lost events?)");
3108		printf("\n");
3109	}
3110}
3111
3112static void __merge_work_atoms(struct rb_root_cached *root, struct work_atoms *data)
3113{
3114	struct rb_node **new = &(root->rb_root.rb_node), *parent = NULL;
3115	struct work_atoms *this;
3116	const char *comm = thread__comm_str(data->thread), *this_comm;
3117	bool leftmost = true;
3118
3119	while (*new) {
3120		int cmp;
3121
3122		this = container_of(*new, struct work_atoms, node);
3123		parent = *new;
3124
3125		this_comm = thread__comm_str(this->thread);
3126		cmp = strcmp(comm, this_comm);
3127		if (cmp > 0) {
3128			new = &((*new)->rb_left);
3129		} else if (cmp < 0) {
3130			new = &((*new)->rb_right);
3131			leftmost = false;
3132		} else {
3133			this->num_merged++;
3134			this->total_runtime += data->total_runtime;
3135			this->nb_atoms += data->nb_atoms;
3136			this->total_lat += data->total_lat;
3137			list_splice(&data->work_list, &this->work_list);
3138			if (this->max_lat < data->max_lat) {
3139				this->max_lat = data->max_lat;
3140				this->max_lat_at = data->max_lat_at;
3141			}
3142			zfree(&data);
3143			return;
3144		}
3145	}
3146
3147	data->num_merged++;
3148	rb_link_node(&data->node, parent, new);
3149	rb_insert_color_cached(&data->node, root, leftmost);
3150}
3151
3152static void perf_sched__merge_lat(struct perf_sched *sched)
3153{
3154	struct work_atoms *data;
3155	struct rb_node *node;
3156
3157	if (sched->skip_merge)
3158		return;
3159
3160	while ((node = rb_first_cached(&sched->atom_root))) {
3161		rb_erase_cached(node, &sched->atom_root);
3162		data = rb_entry(node, struct work_atoms, node);
3163		__merge_work_atoms(&sched->merged_atom_root, data);
3164	}
3165}
3166
3167static int perf_sched__lat(struct perf_sched *sched)
3168{
3169	struct rb_node *next;
3170
3171	setup_pager();
3172
3173	if (perf_sched__read_events(sched))
3174		return -1;
3175
3176	perf_sched__merge_lat(sched);
3177	perf_sched__sort_lat(sched);
3178
3179	printf("\n -----------------------------------------------------------------------------------------------------------------\n");
3180	printf("  Task                  |   Runtime ms  | Switches | Average delay ms | Maximum delay ms | Maximum delay at       |\n");
3181	printf(" -----------------------------------------------------------------------------------------------------------------\n");
3182
3183	next = rb_first_cached(&sched->sorted_atom_root);
3184
3185	while (next) {
3186		struct work_atoms *work_list;
3187
3188		work_list = rb_entry(next, struct work_atoms, node);
3189		output_lat_thread(sched, work_list);
3190		next = rb_next(next);
3191		thread__zput(work_list->thread);
3192	}
3193
3194	printf(" -----------------------------------------------------------------------------------------------------------------\n");
3195	printf("  TOTAL:                |%11.3f ms |%9" PRIu64 " |\n",
3196		(double)sched->all_runtime / NSEC_PER_MSEC, sched->all_count);
3197
3198	printf(" ---------------------------------------------------\n");
3199
3200	print_bad_events(sched);
3201	printf("\n");
3202
3203	return 0;
3204}
3205
3206static int setup_map_cpus(struct perf_sched *sched)
3207{
3208	struct perf_cpu_map *map;
3209
3210	sched->max_cpu  = sysconf(_SC_NPROCESSORS_CONF);
3211
3212	if (sched->map.comp) {
3213		sched->map.comp_cpus = zalloc(sched->max_cpu * sizeof(int));
3214		if (!sched->map.comp_cpus)
3215			return -1;
3216	}
3217
3218	if (!sched->map.cpus_str)
3219		return 0;
3220
3221	map = perf_cpu_map__new(sched->map.cpus_str);
3222	if (!map) {
3223		pr_err("failed to get cpus map from %s\n", sched->map.cpus_str);
3224		return -1;
3225	}
3226
3227	sched->map.cpus = map;
3228	return 0;
3229}
3230
3231static int setup_color_pids(struct perf_sched *sched)
3232{
3233	struct perf_thread_map *map;
3234
3235	if (!sched->map.color_pids_str)
3236		return 0;
3237
3238	map = thread_map__new_by_tid_str(sched->map.color_pids_str);
3239	if (!map) {
3240		pr_err("failed to get thread map from %s\n", sched->map.color_pids_str);
3241		return -1;
3242	}
3243
3244	sched->map.color_pids = map;
3245	return 0;
3246}
3247
3248static int setup_color_cpus(struct perf_sched *sched)
3249{
3250	struct perf_cpu_map *map;
3251
3252	if (!sched->map.color_cpus_str)
3253		return 0;
3254
3255	map = perf_cpu_map__new(sched->map.color_cpus_str);
3256	if (!map) {
3257		pr_err("failed to get thread map from %s\n", sched->map.color_cpus_str);
3258		return -1;
3259	}
3260
3261	sched->map.color_cpus = map;
3262	return 0;
3263}
3264
3265static int perf_sched__map(struct perf_sched *sched)
3266{
3267	if (setup_map_cpus(sched))
3268		return -1;
3269
3270	if (setup_color_pids(sched))
3271		return -1;
3272
3273	if (setup_color_cpus(sched))
3274		return -1;
3275
3276	setup_pager();
3277	if (perf_sched__read_events(sched))
3278		return -1;
3279	print_bad_events(sched);
3280	return 0;
3281}
3282
3283static int perf_sched__replay(struct perf_sched *sched)
3284{
3285	unsigned long i;
3286
3287	calibrate_run_measurement_overhead(sched);
3288	calibrate_sleep_measurement_overhead(sched);
3289
3290	test_calibrations(sched);
3291
3292	if (perf_sched__read_events(sched))
3293		return -1;
3294
3295	printf("nr_run_events:        %ld\n", sched->nr_run_events);
3296	printf("nr_sleep_events:      %ld\n", sched->nr_sleep_events);
3297	printf("nr_wakeup_events:     %ld\n", sched->nr_wakeup_events);
3298
3299	if (sched->targetless_wakeups)
3300		printf("target-less wakeups:  %ld\n", sched->targetless_wakeups);
3301	if (sched->multitarget_wakeups)
3302		printf("multi-target wakeups: %ld\n", sched->multitarget_wakeups);
3303	if (sched->nr_run_events_optimized)
3304		printf("run atoms optimized: %ld\n",
3305			sched->nr_run_events_optimized);
3306
3307	print_task_traces(sched);
3308	add_cross_task_wakeups(sched);
3309
3310	create_tasks(sched);
3311	printf("------------------------------------------------------------\n");
3312	for (i = 0; i < sched->replay_repeat; i++)
3313		run_one_test(sched);
3314
3315	return 0;
3316}
3317
3318static void setup_sorting(struct perf_sched *sched, const struct option *options,
3319			  const char * const usage_msg[])
3320{
3321	char *tmp, *tok, *str = strdup(sched->sort_order);
3322
3323	for (tok = strtok_r(str, ", ", &tmp);
3324			tok; tok = strtok_r(NULL, ", ", &tmp)) {
3325		if (sort_dimension__add(tok, &sched->sort_list) < 0) {
3326			usage_with_options_msg(usage_msg, options,
3327					"Unknown --sort key: `%s'", tok);
3328		}
3329	}
3330
3331	free(str);
3332
3333	sort_dimension__add("pid", &sched->cmp_pid);
3334}
3335
3336static int __cmd_record(int argc, const char **argv)
3337{
3338	unsigned int rec_argc, i, j;
3339	const char **rec_argv;
3340	const char * const record_args[] = {
3341		"record",
3342		"-a",
3343		"-R",
3344		"-m", "1024",
3345		"-c", "1",
3346		"-e", "sched:sched_switch",
3347		"-e", "sched:sched_stat_wait",
3348		"-e", "sched:sched_stat_sleep",
3349		"-e", "sched:sched_stat_iowait",
3350		"-e", "sched:sched_stat_runtime",
3351		"-e", "sched:sched_process_fork",
 
3352		"-e", "sched:sched_wakeup_new",
3353		"-e", "sched:sched_migrate_task",
3354	};
3355	struct tep_event *waking_event;
3356
3357	/*
3358	 * +2 for either "-e", "sched:sched_wakeup" or
3359	 * "-e", "sched:sched_waking"
3360	 */
3361	rec_argc = ARRAY_SIZE(record_args) + 2 + argc - 1;
3362	rec_argv = calloc(rec_argc + 1, sizeof(char *));
3363
3364	if (rec_argv == NULL)
3365		return -ENOMEM;
3366
3367	for (i = 0; i < ARRAY_SIZE(record_args); i++)
3368		rec_argv[i] = strdup(record_args[i]);
3369
3370	rec_argv[i++] = "-e";
3371	waking_event = trace_event__tp_format("sched", "sched_waking");
3372	if (!IS_ERR(waking_event))
3373		rec_argv[i++] = strdup("sched:sched_waking");
3374	else
3375		rec_argv[i++] = strdup("sched:sched_wakeup");
3376
3377	for (j = 1; j < (unsigned int)argc; j++, i++)
3378		rec_argv[i] = argv[j];
3379
3380	BUG_ON(i != rec_argc);
3381
3382	return cmd_record(i, rec_argv);
3383}
3384
3385int cmd_sched(int argc, const char **argv)
3386{
3387	static const char default_sort_order[] = "avg, max, switch, runtime";
3388	struct perf_sched sched = {
3389		.tool = {
3390			.sample		 = perf_sched__process_tracepoint_sample,
3391			.comm		 = perf_sched__process_comm,
3392			.namespaces	 = perf_event__process_namespaces,
3393			.lost		 = perf_event__process_lost,
3394			.fork		 = perf_sched__process_fork_event,
3395			.ordered_events = true,
3396		},
3397		.cmp_pid	      = LIST_HEAD_INIT(sched.cmp_pid),
3398		.sort_list	      = LIST_HEAD_INIT(sched.sort_list),
3399		.start_work_mutex     = PTHREAD_MUTEX_INITIALIZER,
3400		.work_done_wait_mutex = PTHREAD_MUTEX_INITIALIZER,
3401		.sort_order	      = default_sort_order,
3402		.replay_repeat	      = 10,
3403		.profile_cpu	      = -1,
3404		.next_shortname1      = 'A',
3405		.next_shortname2      = '0',
3406		.skip_merge           = 0,
3407		.show_callchain	      = 1,
3408		.max_stack            = 5,
3409	};
3410	const struct option sched_options[] = {
3411	OPT_STRING('i', "input", &input_name, "file",
3412		    "input file name"),
3413	OPT_INCR('v', "verbose", &verbose,
3414		    "be more verbose (show symbol address, etc)"),
3415	OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
3416		    "dump raw trace in ASCII"),
3417	OPT_BOOLEAN('f', "force", &sched.force, "don't complain, do it"),
3418	OPT_END()
3419	};
3420	const struct option latency_options[] = {
3421	OPT_STRING('s', "sort", &sched.sort_order, "key[,key2...]",
3422		   "sort by key(s): runtime, switch, avg, max"),
 
 
3423	OPT_INTEGER('C', "CPU", &sched.profile_cpu,
3424		    "CPU to profile on"),
 
 
3425	OPT_BOOLEAN('p', "pids", &sched.skip_merge,
3426		    "latency stats per pid instead of per comm"),
3427	OPT_PARENT(sched_options)
3428	};
3429	const struct option replay_options[] = {
3430	OPT_UINTEGER('r', "repeat", &sched.replay_repeat,
3431		     "repeat the workload replay N times (-1: infinite)"),
3432	OPT_PARENT(sched_options)
 
 
 
 
 
3433	};
3434	const struct option map_options[] = {
3435	OPT_BOOLEAN(0, "compact", &sched.map.comp,
3436		    "map output in compact mode"),
3437	OPT_STRING(0, "color-pids", &sched.map.color_pids_str, "pids",
3438		   "highlight given pids in map"),
3439	OPT_STRING(0, "color-cpus", &sched.map.color_cpus_str, "cpus",
3440                    "highlight given CPUs in map"),
3441	OPT_STRING(0, "cpus", &sched.map.cpus_str, "cpus",
3442                    "display given CPUs in map"),
3443	OPT_PARENT(sched_options)
3444	};
3445	const struct option timehist_options[] = {
3446	OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
3447		   "file", "vmlinux pathname"),
3448	OPT_STRING(0, "kallsyms", &symbol_conf.kallsyms_name,
3449		   "file", "kallsyms pathname"),
3450	OPT_BOOLEAN('g', "call-graph", &sched.show_callchain,
3451		    "Display call chains if present (default on)"),
3452	OPT_UINTEGER(0, "max-stack", &sched.max_stack,
3453		   "Maximum number of functions to display backtrace."),
3454	OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
3455		    "Look for files with symbols relative to this directory"),
3456	OPT_BOOLEAN('s', "summary", &sched.summary_only,
3457		    "Show only syscall summary with statistics"),
3458	OPT_BOOLEAN('S', "with-summary", &sched.summary,
3459		    "Show all syscalls and summary with statistics"),
3460	OPT_BOOLEAN('w', "wakeups", &sched.show_wakeups, "Show wakeup events"),
3461	OPT_BOOLEAN('n', "next", &sched.show_next, "Show next task"),
3462	OPT_BOOLEAN('M', "migrations", &sched.show_migrations, "Show migration events"),
3463	OPT_BOOLEAN('V', "cpu-visual", &sched.show_cpu_visual, "Add CPU visual"),
3464	OPT_BOOLEAN('I', "idle-hist", &sched.idle_hist, "Show idle events only"),
3465	OPT_STRING(0, "time", &sched.time_str, "str",
3466		   "Time span for analysis (start,stop)"),
3467	OPT_BOOLEAN(0, "state", &sched.show_state, "Show task state when sched-out"),
3468	OPT_STRING('p', "pid", &symbol_conf.pid_list_str, "pid[,pid...]",
3469		   "analyze events only for given process id(s)"),
3470	OPT_STRING('t', "tid", &symbol_conf.tid_list_str, "tid[,tid...]",
3471		   "analyze events only for given thread id(s)"),
3472	OPT_STRING('C', "cpu", &cpu_list, "cpu", "list of cpus to profile"),
3473	OPT_PARENT(sched_options)
3474	};
3475
3476	const char * const latency_usage[] = {
3477		"perf sched latency [<options>]",
3478		NULL
3479	};
3480	const char * const replay_usage[] = {
3481		"perf sched replay [<options>]",
3482		NULL
3483	};
3484	const char * const map_usage[] = {
3485		"perf sched map [<options>]",
3486		NULL
3487	};
3488	const char * const timehist_usage[] = {
3489		"perf sched timehist [<options>]",
3490		NULL
3491	};
3492	const char *const sched_subcommands[] = { "record", "latency", "map",
3493						  "replay", "script",
3494						  "timehist", NULL };
3495	const char *sched_usage[] = {
3496		NULL,
3497		NULL
3498	};
3499	struct trace_sched_handler lat_ops  = {
3500		.wakeup_event	    = latency_wakeup_event,
3501		.switch_event	    = latency_switch_event,
3502		.runtime_event	    = latency_runtime_event,
3503		.migrate_task_event = latency_migrate_task_event,
3504	};
3505	struct trace_sched_handler map_ops  = {
3506		.switch_event	    = map_switch_event,
3507	};
3508	struct trace_sched_handler replay_ops  = {
3509		.wakeup_event	    = replay_wakeup_event,
3510		.switch_event	    = replay_switch_event,
3511		.fork_event	    = replay_fork_event,
3512	};
3513	unsigned int i;
3514
3515	for (i = 0; i < ARRAY_SIZE(sched.curr_pid); i++)
3516		sched.curr_pid[i] = -1;
3517
3518	argc = parse_options_subcommand(argc, argv, sched_options, sched_subcommands,
3519					sched_usage, PARSE_OPT_STOP_AT_NON_OPTION);
3520	if (!argc)
3521		usage_with_options(sched_usage, sched_options);
3522
3523	/*
3524	 * Aliased to 'perf script' for now:
3525	 */
3526	if (!strcmp(argv[0], "script"))
3527		return cmd_script(argc, argv);
3528
3529	if (!strncmp(argv[0], "rec", 3)) {
3530		return __cmd_record(argc, argv);
3531	} else if (!strncmp(argv[0], "lat", 3)) {
3532		sched.tp_handler = &lat_ops;
3533		if (argc > 1) {
3534			argc = parse_options(argc, argv, latency_options, latency_usage, 0);
3535			if (argc)
3536				usage_with_options(latency_usage, latency_options);
3537		}
3538		setup_sorting(&sched, latency_options, latency_usage);
3539		return perf_sched__lat(&sched);
3540	} else if (!strcmp(argv[0], "map")) {
3541		if (argc) {
3542			argc = parse_options(argc, argv, map_options, map_usage, 0);
3543			if (argc)
3544				usage_with_options(map_usage, map_options);
3545		}
3546		sched.tp_handler = &map_ops;
3547		setup_sorting(&sched, latency_options, latency_usage);
3548		return perf_sched__map(&sched);
3549	} else if (!strncmp(argv[0], "rep", 3)) {
3550		sched.tp_handler = &replay_ops;
3551		if (argc) {
3552			argc = parse_options(argc, argv, replay_options, replay_usage, 0);
3553			if (argc)
3554				usage_with_options(replay_usage, replay_options);
3555		}
3556		return perf_sched__replay(&sched);
3557	} else if (!strcmp(argv[0], "timehist")) {
3558		if (argc) {
3559			argc = parse_options(argc, argv, timehist_options,
3560					     timehist_usage, 0);
3561			if (argc)
3562				usage_with_options(timehist_usage, timehist_options);
3563		}
3564		if ((sched.show_wakeups || sched.show_next) &&
3565		    sched.summary_only) {
3566			pr_err(" Error: -s and -[n|w] are mutually exclusive.\n");
3567			parse_options_usage(timehist_usage, timehist_options, "s", true);
3568			if (sched.show_wakeups)
3569				parse_options_usage(NULL, timehist_options, "w", true);
3570			if (sched.show_next)
3571				parse_options_usage(NULL, timehist_options, "n", true);
3572			return -EINVAL;
3573		}
3574
3575		return perf_sched__timehist(&sched);
3576	} else {
3577		usage_with_options(sched_usage, sched_options);
3578	}
3579
3580	return 0;
3581}