1 // SPDX-License-Identifier: GPL-2.0
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"
23 #include <subcmd/pager.h>
24 #include <subcmd/parse-options.h>
25 #include "util/trace-event.h"
27 #include "util/debug.h"
28 #include "util/event.h"
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>
38 #include <semaphore.h>
41 #include <api/fs/fs.h>
42 #include <perf/cpumap.h>
43 #include <linux/time64.h>
44 #include <linux/err.h>
46 #include <linux/ctype.h>
48 #define PR_SET_NAME 15 /* Set process name */
52 #define MAX_PID 1024000
61 unsigned long nr_events;
62 unsigned long curr_event;
63 struct sched_atom **atoms;
74 enum sched_event_type {
78 SCHED_EVENT_MIGRATION,
82 enum sched_event_type type;
88 struct task_desc *wakee;
91 #define TASK_STATE_TO_CHAR_STR "RSDTtZXxKWP"
93 /* task state bitmask, copied from include/linux/sched.h */
94 #define TASK_RUNNING 0
95 #define TASK_INTERRUPTIBLE 1
96 #define TASK_UNINTERRUPTIBLE 2
97 #define __TASK_STOPPED 4
98 #define __TASK_TRACED 8
99 /* in tsk->exit_state */
101 #define EXIT_ZOMBIE 32
102 #define EXIT_TRACE (EXIT_ZOMBIE | EXIT_DEAD)
103 /* in tsk->state again */
105 #define TASK_WAKEKILL 128
106 #define TASK_WAKING 256
107 #define TASK_PARKED 512
117 struct list_head list;
118 enum thread_state state;
126 struct list_head work_list;
127 struct thread *thread;
137 typedef int (*sort_fn_t)(struct work_atoms *, struct work_atoms *);
141 struct trace_sched_handler {
142 int (*switch_event)(struct perf_sched *sched, struct evsel *evsel,
143 struct perf_sample *sample, struct machine *machine);
145 int (*runtime_event)(struct perf_sched *sched, struct evsel *evsel,
146 struct perf_sample *sample, struct machine *machine);
148 int (*wakeup_event)(struct perf_sched *sched, struct evsel *evsel,
149 struct perf_sample *sample, struct machine *machine);
151 /* PERF_RECORD_FORK event, not sched_process_fork tracepoint */
152 int (*fork_event)(struct perf_sched *sched, union perf_event *event,
153 struct machine *machine);
155 int (*migrate_task_event)(struct perf_sched *sched,
157 struct perf_sample *sample,
158 struct machine *machine);
161 #define COLOR_PIDS PERF_COLOR_BLUE
162 #define COLOR_CPUS PERF_COLOR_BG_RED
164 struct perf_sched_map {
165 DECLARE_BITMAP(comp_cpus_mask, MAX_CPUS);
168 struct perf_thread_map *color_pids;
169 const char *color_pids_str;
170 struct perf_cpu_map *color_cpus;
171 const char *color_cpus_str;
172 struct perf_cpu_map *cpus;
173 const char *cpus_str;
177 struct perf_tool tool;
178 const char *sort_order;
179 unsigned long nr_tasks;
180 struct task_desc **pid_to_task;
181 struct task_desc **tasks;
182 const struct trace_sched_handler *tp_handler;
183 pthread_mutex_t start_work_mutex;
184 pthread_mutex_t work_done_wait_mutex;
187 * Track the current task - that way we can know whether there's any
188 * weird events, such as a task being switched away that is not current.
191 u32 curr_pid[MAX_CPUS];
192 struct thread *curr_thread[MAX_CPUS];
193 char next_shortname1;
194 char next_shortname2;
195 unsigned int replay_repeat;
196 unsigned long nr_run_events;
197 unsigned long nr_sleep_events;
198 unsigned long nr_wakeup_events;
199 unsigned long nr_sleep_corrections;
200 unsigned long nr_run_events_optimized;
201 unsigned long targetless_wakeups;
202 unsigned long multitarget_wakeups;
203 unsigned long nr_runs;
204 unsigned long nr_timestamps;
205 unsigned long nr_unordered_timestamps;
206 unsigned long nr_context_switch_bugs;
207 unsigned long nr_events;
208 unsigned long nr_lost_chunks;
209 unsigned long nr_lost_events;
210 u64 run_measurement_overhead;
211 u64 sleep_measurement_overhead;
214 u64 runavg_cpu_usage;
215 u64 parent_cpu_usage;
216 u64 runavg_parent_cpu_usage;
222 u64 cpu_last_switched[MAX_CPUS];
223 struct rb_root_cached atom_root, sorted_atom_root, merged_atom_root;
224 struct list_head sort_list, cmp_pid;
227 struct perf_sched_map map;
229 /* options for timehist command */
234 unsigned int max_stack;
235 bool show_cpu_visual;
238 bool show_migrations;
241 const char *time_str;
242 struct perf_time_interval ptime;
243 struct perf_time_interval hist_time;
246 /* per thread run time data */
247 struct thread_runtime {
248 u64 last_time; /* time of previous sched in/out event */
249 u64 dt_run; /* run time */
250 u64 dt_sleep; /* time between CPU access by sleep (off cpu) */
251 u64 dt_iowait; /* time between CPU access by iowait (off cpu) */
252 u64 dt_preempt; /* time between CPU access by preempt (off cpu) */
253 u64 dt_delay; /* time between wakeup and sched-in */
254 u64 ready_to_run; /* time of wakeup */
256 struct stats run_stats;
258 u64 total_sleep_time;
259 u64 total_iowait_time;
260 u64 total_preempt_time;
261 u64 total_delay_time;
271 /* per event run time data */
272 struct evsel_runtime {
273 u64 *last_time; /* time this event was last seen per cpu */
274 u32 ncpu; /* highest cpu slot allocated */
277 /* per cpu idle time data */
278 struct idle_thread_runtime {
279 struct thread_runtime tr;
280 struct thread *last_thread;
281 struct rb_root_cached sorted_root;
282 struct callchain_root callchain;
283 struct callchain_cursor cursor;
286 /* track idle times per cpu */
287 static struct thread **idle_threads;
288 static int idle_max_cpu;
289 static char idle_comm[] = "<idle>";
291 static u64 get_nsecs(void)
295 clock_gettime(CLOCK_MONOTONIC, &ts);
297 return ts.tv_sec * NSEC_PER_SEC + ts.tv_nsec;
300 static void burn_nsecs(struct perf_sched *sched, u64 nsecs)
302 u64 T0 = get_nsecs(), T1;
306 } while (T1 + sched->run_measurement_overhead < T0 + nsecs);
309 static void sleep_nsecs(u64 nsecs)
313 ts.tv_nsec = nsecs % 999999999;
314 ts.tv_sec = nsecs / 999999999;
316 nanosleep(&ts, NULL);
319 static void calibrate_run_measurement_overhead(struct perf_sched *sched)
321 u64 T0, T1, delta, min_delta = NSEC_PER_SEC;
324 for (i = 0; i < 10; i++) {
326 burn_nsecs(sched, 0);
329 min_delta = min(min_delta, delta);
331 sched->run_measurement_overhead = min_delta;
333 printf("run measurement overhead: %" PRIu64 " nsecs\n", min_delta);
336 static void calibrate_sleep_measurement_overhead(struct perf_sched *sched)
338 u64 T0, T1, delta, min_delta = NSEC_PER_SEC;
341 for (i = 0; i < 10; i++) {
346 min_delta = min(min_delta, delta);
349 sched->sleep_measurement_overhead = min_delta;
351 printf("sleep measurement overhead: %" PRIu64 " nsecs\n", min_delta);
354 static struct sched_atom *
355 get_new_event(struct task_desc *task, u64 timestamp)
357 struct sched_atom *event = zalloc(sizeof(*event));
358 unsigned long idx = task->nr_events;
361 event->timestamp = timestamp;
365 size = sizeof(struct sched_atom *) * task->nr_events;
366 task->atoms = realloc(task->atoms, size);
367 BUG_ON(!task->atoms);
369 task->atoms[idx] = event;
374 static struct sched_atom *last_event(struct task_desc *task)
376 if (!task->nr_events)
379 return task->atoms[task->nr_events - 1];
382 static void add_sched_event_run(struct perf_sched *sched, struct task_desc *task,
383 u64 timestamp, u64 duration)
385 struct sched_atom *event, *curr_event = last_event(task);
388 * optimize an existing RUN event by merging this one
391 if (curr_event && curr_event->type == SCHED_EVENT_RUN) {
392 sched->nr_run_events_optimized++;
393 curr_event->duration += duration;
397 event = get_new_event(task, timestamp);
399 event->type = SCHED_EVENT_RUN;
400 event->duration = duration;
402 sched->nr_run_events++;
405 static void add_sched_event_wakeup(struct perf_sched *sched, struct task_desc *task,
406 u64 timestamp, struct task_desc *wakee)
408 struct sched_atom *event, *wakee_event;
410 event = get_new_event(task, timestamp);
411 event->type = SCHED_EVENT_WAKEUP;
412 event->wakee = wakee;
414 wakee_event = last_event(wakee);
415 if (!wakee_event || wakee_event->type != SCHED_EVENT_SLEEP) {
416 sched->targetless_wakeups++;
419 if (wakee_event->wait_sem) {
420 sched->multitarget_wakeups++;
424 wakee_event->wait_sem = zalloc(sizeof(*wakee_event->wait_sem));
425 sem_init(wakee_event->wait_sem, 0, 0);
426 wakee_event->specific_wait = 1;
427 event->wait_sem = wakee_event->wait_sem;
429 sched->nr_wakeup_events++;
432 static void add_sched_event_sleep(struct perf_sched *sched, struct task_desc *task,
433 u64 timestamp, u64 task_state __maybe_unused)
435 struct sched_atom *event = get_new_event(task, timestamp);
437 event->type = SCHED_EVENT_SLEEP;
439 sched->nr_sleep_events++;
442 static struct task_desc *register_pid(struct perf_sched *sched,
443 unsigned long pid, const char *comm)
445 struct task_desc *task;
448 if (sched->pid_to_task == NULL) {
449 if (sysctl__read_int("kernel/pid_max", &pid_max) < 0)
451 BUG_ON((sched->pid_to_task = calloc(pid_max, sizeof(struct task_desc *))) == NULL);
453 if (pid >= (unsigned long)pid_max) {
454 BUG_ON((sched->pid_to_task = realloc(sched->pid_to_task, (pid + 1) *
455 sizeof(struct task_desc *))) == NULL);
456 while (pid >= (unsigned long)pid_max)
457 sched->pid_to_task[pid_max++] = NULL;
460 task = sched->pid_to_task[pid];
465 task = zalloc(sizeof(*task));
467 task->nr = sched->nr_tasks;
468 strcpy(task->comm, comm);
470 * every task starts in sleeping state - this gets ignored
471 * if there's no wakeup pointing to this sleep state:
473 add_sched_event_sleep(sched, task, 0, 0);
475 sched->pid_to_task[pid] = task;
477 sched->tasks = realloc(sched->tasks, sched->nr_tasks * sizeof(struct task_desc *));
478 BUG_ON(!sched->tasks);
479 sched->tasks[task->nr] = task;
482 printf("registered task #%ld, PID %ld (%s)\n", sched->nr_tasks, pid, comm);
488 static void print_task_traces(struct perf_sched *sched)
490 struct task_desc *task;
493 for (i = 0; i < sched->nr_tasks; i++) {
494 task = sched->tasks[i];
495 printf("task %6ld (%20s:%10ld), nr_events: %ld\n",
496 task->nr, task->comm, task->pid, task->nr_events);
500 static void add_cross_task_wakeups(struct perf_sched *sched)
502 struct task_desc *task1, *task2;
505 for (i = 0; i < sched->nr_tasks; i++) {
506 task1 = sched->tasks[i];
508 if (j == sched->nr_tasks)
510 task2 = sched->tasks[j];
511 add_sched_event_wakeup(sched, task1, 0, task2);
515 static void perf_sched__process_event(struct perf_sched *sched,
516 struct sched_atom *atom)
520 switch (atom->type) {
521 case SCHED_EVENT_RUN:
522 burn_nsecs(sched, atom->duration);
524 case SCHED_EVENT_SLEEP:
526 ret = sem_wait(atom->wait_sem);
529 case SCHED_EVENT_WAKEUP:
531 ret = sem_post(atom->wait_sem);
534 case SCHED_EVENT_MIGRATION:
541 static u64 get_cpu_usage_nsec_parent(void)
547 err = getrusage(RUSAGE_SELF, &ru);
550 sum = ru.ru_utime.tv_sec * NSEC_PER_SEC + ru.ru_utime.tv_usec * NSEC_PER_USEC;
551 sum += ru.ru_stime.tv_sec * NSEC_PER_SEC + ru.ru_stime.tv_usec * NSEC_PER_USEC;
556 static int self_open_counters(struct perf_sched *sched, unsigned long cur_task)
558 struct perf_event_attr attr;
559 char sbuf[STRERR_BUFSIZE], info[STRERR_BUFSIZE];
562 bool need_privilege = false;
564 memset(&attr, 0, sizeof(attr));
566 attr.type = PERF_TYPE_SOFTWARE;
567 attr.config = PERF_COUNT_SW_TASK_CLOCK;
570 fd = sys_perf_event_open(&attr, 0, -1, -1,
571 perf_event_open_cloexec_flag());
574 if (errno == EMFILE) {
576 BUG_ON(getrlimit(RLIMIT_NOFILE, &limit) == -1);
577 limit.rlim_cur += sched->nr_tasks - cur_task;
578 if (limit.rlim_cur > limit.rlim_max) {
579 limit.rlim_max = limit.rlim_cur;
580 need_privilege = true;
582 if (setrlimit(RLIMIT_NOFILE, &limit) == -1) {
583 if (need_privilege && errno == EPERM)
584 strcpy(info, "Need privilege\n");
588 strcpy(info, "Have a try with -f option\n");
590 pr_err("Error: sys_perf_event_open() syscall returned "
591 "with %d (%s)\n%s", fd,
592 str_error_r(errno, sbuf, sizeof(sbuf)), info);
598 static u64 get_cpu_usage_nsec_self(int fd)
603 ret = read(fd, &runtime, sizeof(runtime));
604 BUG_ON(ret != sizeof(runtime));
609 struct sched_thread_parms {
610 struct task_desc *task;
611 struct perf_sched *sched;
615 static void *thread_func(void *ctx)
617 struct sched_thread_parms *parms = ctx;
618 struct task_desc *this_task = parms->task;
619 struct perf_sched *sched = parms->sched;
620 u64 cpu_usage_0, cpu_usage_1;
621 unsigned long i, ret;
627 sprintf(comm2, ":%s", this_task->comm);
628 prctl(PR_SET_NAME, comm2);
632 ret = sem_post(&this_task->ready_for_work);
634 ret = pthread_mutex_lock(&sched->start_work_mutex);
636 ret = pthread_mutex_unlock(&sched->start_work_mutex);
639 cpu_usage_0 = get_cpu_usage_nsec_self(fd);
641 for (i = 0; i < this_task->nr_events; i++) {
642 this_task->curr_event = i;
643 perf_sched__process_event(sched, this_task->atoms[i]);
646 cpu_usage_1 = get_cpu_usage_nsec_self(fd);
647 this_task->cpu_usage = cpu_usage_1 - cpu_usage_0;
648 ret = sem_post(&this_task->work_done_sem);
651 ret = pthread_mutex_lock(&sched->work_done_wait_mutex);
653 ret = pthread_mutex_unlock(&sched->work_done_wait_mutex);
659 static void create_tasks(struct perf_sched *sched)
661 struct task_desc *task;
666 err = pthread_attr_init(&attr);
668 err = pthread_attr_setstacksize(&attr,
669 (size_t) max(16 * 1024, PTHREAD_STACK_MIN));
671 err = pthread_mutex_lock(&sched->start_work_mutex);
673 err = pthread_mutex_lock(&sched->work_done_wait_mutex);
675 for (i = 0; i < sched->nr_tasks; i++) {
676 struct sched_thread_parms *parms = malloc(sizeof(*parms));
677 BUG_ON(parms == NULL);
678 parms->task = task = sched->tasks[i];
679 parms->sched = sched;
680 parms->fd = self_open_counters(sched, i);
681 sem_init(&task->sleep_sem, 0, 0);
682 sem_init(&task->ready_for_work, 0, 0);
683 sem_init(&task->work_done_sem, 0, 0);
684 task->curr_event = 0;
685 err = pthread_create(&task->thread, &attr, thread_func, parms);
690 static void wait_for_tasks(struct perf_sched *sched)
692 u64 cpu_usage_0, cpu_usage_1;
693 struct task_desc *task;
694 unsigned long i, ret;
696 sched->start_time = get_nsecs();
697 sched->cpu_usage = 0;
698 pthread_mutex_unlock(&sched->work_done_wait_mutex);
700 for (i = 0; i < sched->nr_tasks; i++) {
701 task = sched->tasks[i];
702 ret = sem_wait(&task->ready_for_work);
704 sem_init(&task->ready_for_work, 0, 0);
706 ret = pthread_mutex_lock(&sched->work_done_wait_mutex);
709 cpu_usage_0 = get_cpu_usage_nsec_parent();
711 pthread_mutex_unlock(&sched->start_work_mutex);
713 for (i = 0; i < sched->nr_tasks; i++) {
714 task = sched->tasks[i];
715 ret = sem_wait(&task->work_done_sem);
717 sem_init(&task->work_done_sem, 0, 0);
718 sched->cpu_usage += task->cpu_usage;
722 cpu_usage_1 = get_cpu_usage_nsec_parent();
723 if (!sched->runavg_cpu_usage)
724 sched->runavg_cpu_usage = sched->cpu_usage;
725 sched->runavg_cpu_usage = (sched->runavg_cpu_usage * (sched->replay_repeat - 1) + sched->cpu_usage) / sched->replay_repeat;
727 sched->parent_cpu_usage = cpu_usage_1 - cpu_usage_0;
728 if (!sched->runavg_parent_cpu_usage)
729 sched->runavg_parent_cpu_usage = sched->parent_cpu_usage;
730 sched->runavg_parent_cpu_usage = (sched->runavg_parent_cpu_usage * (sched->replay_repeat - 1) +
731 sched->parent_cpu_usage)/sched->replay_repeat;
733 ret = pthread_mutex_lock(&sched->start_work_mutex);
736 for (i = 0; i < sched->nr_tasks; i++) {
737 task = sched->tasks[i];
738 sem_init(&task->sleep_sem, 0, 0);
739 task->curr_event = 0;
743 static void run_one_test(struct perf_sched *sched)
745 u64 T0, T1, delta, avg_delta, fluct;
748 wait_for_tasks(sched);
752 sched->sum_runtime += delta;
755 avg_delta = sched->sum_runtime / sched->nr_runs;
756 if (delta < avg_delta)
757 fluct = avg_delta - delta;
759 fluct = delta - avg_delta;
760 sched->sum_fluct += fluct;
762 sched->run_avg = delta;
763 sched->run_avg = (sched->run_avg * (sched->replay_repeat - 1) + delta) / sched->replay_repeat;
765 printf("#%-3ld: %0.3f, ", sched->nr_runs, (double)delta / NSEC_PER_MSEC);
767 printf("ravg: %0.2f, ", (double)sched->run_avg / NSEC_PER_MSEC);
769 printf("cpu: %0.2f / %0.2f",
770 (double)sched->cpu_usage / NSEC_PER_MSEC, (double)sched->runavg_cpu_usage / NSEC_PER_MSEC);
774 * rusage statistics done by the parent, these are less
775 * accurate than the sched->sum_exec_runtime based statistics:
777 printf(" [%0.2f / %0.2f]",
778 (double)sched->parent_cpu_usage / NSEC_PER_MSEC,
779 (double)sched->runavg_parent_cpu_usage / NSEC_PER_MSEC);
784 if (sched->nr_sleep_corrections)
785 printf(" (%ld sleep corrections)\n", sched->nr_sleep_corrections);
786 sched->nr_sleep_corrections = 0;
789 static void test_calibrations(struct perf_sched *sched)
794 burn_nsecs(sched, NSEC_PER_MSEC);
797 printf("the run test took %" PRIu64 " nsecs\n", T1 - T0);
800 sleep_nsecs(NSEC_PER_MSEC);
803 printf("the sleep test took %" PRIu64 " nsecs\n", T1 - T0);
807 replay_wakeup_event(struct perf_sched *sched,
808 struct evsel *evsel, struct perf_sample *sample,
809 struct machine *machine __maybe_unused)
811 const char *comm = perf_evsel__strval(evsel, sample, "comm");
812 const u32 pid = perf_evsel__intval(evsel, sample, "pid");
813 struct task_desc *waker, *wakee;
816 printf("sched_wakeup event %p\n", evsel);
818 printf(" ... pid %d woke up %s/%d\n", sample->tid, comm, pid);
821 waker = register_pid(sched, sample->tid, "<unknown>");
822 wakee = register_pid(sched, pid, comm);
824 add_sched_event_wakeup(sched, waker, sample->time, wakee);
828 static int replay_switch_event(struct perf_sched *sched,
830 struct perf_sample *sample,
831 struct machine *machine __maybe_unused)
833 const char *prev_comm = perf_evsel__strval(evsel, sample, "prev_comm"),
834 *next_comm = perf_evsel__strval(evsel, sample, "next_comm");
835 const u32 prev_pid = perf_evsel__intval(evsel, sample, "prev_pid"),
836 next_pid = perf_evsel__intval(evsel, sample, "next_pid");
837 const u64 prev_state = perf_evsel__intval(evsel, sample, "prev_state");
838 struct task_desc *prev, __maybe_unused *next;
839 u64 timestamp0, timestamp = sample->time;
840 int cpu = sample->cpu;
844 printf("sched_switch event %p\n", evsel);
846 if (cpu >= MAX_CPUS || cpu < 0)
849 timestamp0 = sched->cpu_last_switched[cpu];
851 delta = timestamp - timestamp0;
856 pr_err("hm, delta: %" PRIu64 " < 0 ?\n", delta);
860 pr_debug(" ... switch from %s/%d to %s/%d [ran %" PRIu64 " nsecs]\n",
861 prev_comm, prev_pid, next_comm, next_pid, delta);
863 prev = register_pid(sched, prev_pid, prev_comm);
864 next = register_pid(sched, next_pid, next_comm);
866 sched->cpu_last_switched[cpu] = timestamp;
868 add_sched_event_run(sched, prev, timestamp, delta);
869 add_sched_event_sleep(sched, prev, timestamp, prev_state);
874 static int replay_fork_event(struct perf_sched *sched,
875 union perf_event *event,
876 struct machine *machine)
878 struct thread *child, *parent;
880 child = machine__findnew_thread(machine, event->fork.pid,
882 parent = machine__findnew_thread(machine, event->fork.ppid,
885 if (child == NULL || parent == NULL) {
886 pr_debug("thread does not exist on fork event: child %p, parent %p\n",
892 printf("fork event\n");
893 printf("... parent: %s/%d\n", thread__comm_str(parent), parent->tid);
894 printf("... child: %s/%d\n", thread__comm_str(child), child->tid);
897 register_pid(sched, parent->tid, thread__comm_str(parent));
898 register_pid(sched, child->tid, thread__comm_str(child));
905 struct sort_dimension {
908 struct list_head list;
912 * handle runtime stats saved per thread
914 static struct thread_runtime *thread__init_runtime(struct thread *thread)
916 struct thread_runtime *r;
918 r = zalloc(sizeof(struct thread_runtime));
922 init_stats(&r->run_stats);
923 thread__set_priv(thread, r);
928 static struct thread_runtime *thread__get_runtime(struct thread *thread)
930 struct thread_runtime *tr;
932 tr = thread__priv(thread);
934 tr = thread__init_runtime(thread);
936 pr_debug("Failed to malloc memory for runtime data.\n");
943 thread_lat_cmp(struct list_head *list, struct work_atoms *l, struct work_atoms *r)
945 struct sort_dimension *sort;
948 BUG_ON(list_empty(list));
950 list_for_each_entry(sort, list, list) {
951 ret = sort->cmp(l, r);
959 static struct work_atoms *
960 thread_atoms_search(struct rb_root_cached *root, struct thread *thread,
961 struct list_head *sort_list)
963 struct rb_node *node = root->rb_root.rb_node;
964 struct work_atoms key = { .thread = thread };
967 struct work_atoms *atoms;
970 atoms = container_of(node, struct work_atoms, node);
972 cmp = thread_lat_cmp(sort_list, &key, atoms);
974 node = node->rb_left;
976 node = node->rb_right;
978 BUG_ON(thread != atoms->thread);
986 __thread_latency_insert(struct rb_root_cached *root, struct work_atoms *data,
987 struct list_head *sort_list)
989 struct rb_node **new = &(root->rb_root.rb_node), *parent = NULL;
990 bool leftmost = true;
993 struct work_atoms *this;
996 this = container_of(*new, struct work_atoms, node);
999 cmp = thread_lat_cmp(sort_list, data, this);
1002 new = &((*new)->rb_left);
1004 new = &((*new)->rb_right);
1009 rb_link_node(&data->node, parent, new);
1010 rb_insert_color_cached(&data->node, root, leftmost);
1013 static int thread_atoms_insert(struct perf_sched *sched, struct thread *thread)
1015 struct work_atoms *atoms = zalloc(sizeof(*atoms));
1017 pr_err("No memory at %s\n", __func__);
1021 atoms->thread = thread__get(thread);
1022 INIT_LIST_HEAD(&atoms->work_list);
1023 __thread_latency_insert(&sched->atom_root, atoms, &sched->cmp_pid);
1027 static char sched_out_state(u64 prev_state)
1029 const char *str = TASK_STATE_TO_CHAR_STR;
1031 return str[prev_state];
1035 add_sched_out_event(struct work_atoms *atoms,
1039 struct work_atom *atom = zalloc(sizeof(*atom));
1041 pr_err("Non memory at %s", __func__);
1045 atom->sched_out_time = timestamp;
1047 if (run_state == 'R') {
1048 atom->state = THREAD_WAIT_CPU;
1049 atom->wake_up_time = atom->sched_out_time;
1052 list_add_tail(&atom->list, &atoms->work_list);
1057 add_runtime_event(struct work_atoms *atoms, u64 delta,
1058 u64 timestamp __maybe_unused)
1060 struct work_atom *atom;
1062 BUG_ON(list_empty(&atoms->work_list));
1064 atom = list_entry(atoms->work_list.prev, struct work_atom, list);
1066 atom->runtime += delta;
1067 atoms->total_runtime += delta;
1071 add_sched_in_event(struct work_atoms *atoms, u64 timestamp)
1073 struct work_atom *atom;
1076 if (list_empty(&atoms->work_list))
1079 atom = list_entry(atoms->work_list.prev, struct work_atom, list);
1081 if (atom->state != THREAD_WAIT_CPU)
1084 if (timestamp < atom->wake_up_time) {
1085 atom->state = THREAD_IGNORE;
1089 atom->state = THREAD_SCHED_IN;
1090 atom->sched_in_time = timestamp;
1092 delta = atom->sched_in_time - atom->wake_up_time;
1093 atoms->total_lat += delta;
1094 if (delta > atoms->max_lat) {
1095 atoms->max_lat = delta;
1096 atoms->max_lat_at = timestamp;
1101 static int latency_switch_event(struct perf_sched *sched,
1102 struct evsel *evsel,
1103 struct perf_sample *sample,
1104 struct machine *machine)
1106 const u32 prev_pid = perf_evsel__intval(evsel, sample, "prev_pid"),
1107 next_pid = perf_evsel__intval(evsel, sample, "next_pid");
1108 const u64 prev_state = perf_evsel__intval(evsel, sample, "prev_state");
1109 struct work_atoms *out_events, *in_events;
1110 struct thread *sched_out, *sched_in;
1111 u64 timestamp0, timestamp = sample->time;
1112 int cpu = sample->cpu, err = -1;
1115 BUG_ON(cpu >= MAX_CPUS || cpu < 0);
1117 timestamp0 = sched->cpu_last_switched[cpu];
1118 sched->cpu_last_switched[cpu] = timestamp;
1120 delta = timestamp - timestamp0;
1125 pr_err("hm, delta: %" PRIu64 " < 0 ?\n", delta);
1129 sched_out = machine__findnew_thread(machine, -1, prev_pid);
1130 sched_in = machine__findnew_thread(machine, -1, next_pid);
1131 if (sched_out == NULL || sched_in == NULL)
1134 out_events = thread_atoms_search(&sched->atom_root, sched_out, &sched->cmp_pid);
1136 if (thread_atoms_insert(sched, sched_out))
1138 out_events = thread_atoms_search(&sched->atom_root, sched_out, &sched->cmp_pid);
1140 pr_err("out-event: Internal tree error");
1144 if (add_sched_out_event(out_events, sched_out_state(prev_state), timestamp))
1147 in_events = thread_atoms_search(&sched->atom_root, sched_in, &sched->cmp_pid);
1149 if (thread_atoms_insert(sched, sched_in))
1151 in_events = thread_atoms_search(&sched->atom_root, sched_in, &sched->cmp_pid);
1153 pr_err("in-event: Internal tree error");
1157 * Take came in we have not heard about yet,
1158 * add in an initial atom in runnable state:
1160 if (add_sched_out_event(in_events, 'R', timestamp))
1163 add_sched_in_event(in_events, timestamp);
1166 thread__put(sched_out);
1167 thread__put(sched_in);
1171 static int latency_runtime_event(struct perf_sched *sched,
1172 struct evsel *evsel,
1173 struct perf_sample *sample,
1174 struct machine *machine)
1176 const u32 pid = perf_evsel__intval(evsel, sample, "pid");
1177 const u64 runtime = perf_evsel__intval(evsel, sample, "runtime");
1178 struct thread *thread = machine__findnew_thread(machine, -1, pid);
1179 struct work_atoms *atoms = thread_atoms_search(&sched->atom_root, thread, &sched->cmp_pid);
1180 u64 timestamp = sample->time;
1181 int cpu = sample->cpu, err = -1;
1186 BUG_ON(cpu >= MAX_CPUS || cpu < 0);
1188 if (thread_atoms_insert(sched, thread))
1190 atoms = thread_atoms_search(&sched->atom_root, thread, &sched->cmp_pid);
1192 pr_err("in-event: Internal tree error");
1195 if (add_sched_out_event(atoms, 'R', timestamp))
1199 add_runtime_event(atoms, runtime, timestamp);
1202 thread__put(thread);
1206 static int latency_wakeup_event(struct perf_sched *sched,
1207 struct evsel *evsel,
1208 struct perf_sample *sample,
1209 struct machine *machine)
1211 const u32 pid = perf_evsel__intval(evsel, sample, "pid");
1212 struct work_atoms *atoms;
1213 struct work_atom *atom;
1214 struct thread *wakee;
1215 u64 timestamp = sample->time;
1218 wakee = machine__findnew_thread(machine, -1, pid);
1221 atoms = thread_atoms_search(&sched->atom_root, wakee, &sched->cmp_pid);
1223 if (thread_atoms_insert(sched, wakee))
1225 atoms = thread_atoms_search(&sched->atom_root, wakee, &sched->cmp_pid);
1227 pr_err("wakeup-event: Internal tree error");
1230 if (add_sched_out_event(atoms, 'S', timestamp))
1234 BUG_ON(list_empty(&atoms->work_list));
1236 atom = list_entry(atoms->work_list.prev, struct work_atom, list);
1239 * As we do not guarantee the wakeup event happens when
1240 * task is out of run queue, also may happen when task is
1241 * on run queue and wakeup only change ->state to TASK_RUNNING,
1242 * then we should not set the ->wake_up_time when wake up a
1243 * task which is on run queue.
1245 * You WILL be missing events if you've recorded only
1246 * one CPU, or are only looking at only one, so don't
1247 * skip in this case.
1249 if (sched->profile_cpu == -1 && atom->state != THREAD_SLEEPING)
1252 sched->nr_timestamps++;
1253 if (atom->sched_out_time > timestamp) {
1254 sched->nr_unordered_timestamps++;
1258 atom->state = THREAD_WAIT_CPU;
1259 atom->wake_up_time = timestamp;
1267 static int latency_migrate_task_event(struct perf_sched *sched,
1268 struct evsel *evsel,
1269 struct perf_sample *sample,
1270 struct machine *machine)
1272 const u32 pid = perf_evsel__intval(evsel, sample, "pid");
1273 u64 timestamp = sample->time;
1274 struct work_atoms *atoms;
1275 struct work_atom *atom;
1276 struct thread *migrant;
1280 * Only need to worry about migration when profiling one CPU.
1282 if (sched->profile_cpu == -1)
1285 migrant = machine__findnew_thread(machine, -1, pid);
1286 if (migrant == NULL)
1288 atoms = thread_atoms_search(&sched->atom_root, migrant, &sched->cmp_pid);
1290 if (thread_atoms_insert(sched, migrant))
1292 register_pid(sched, migrant->tid, thread__comm_str(migrant));
1293 atoms = thread_atoms_search(&sched->atom_root, migrant, &sched->cmp_pid);
1295 pr_err("migration-event: Internal tree error");
1298 if (add_sched_out_event(atoms, 'R', timestamp))
1302 BUG_ON(list_empty(&atoms->work_list));
1304 atom = list_entry(atoms->work_list.prev, struct work_atom, list);
1305 atom->sched_in_time = atom->sched_out_time = atom->wake_up_time = timestamp;
1307 sched->nr_timestamps++;
1309 if (atom->sched_out_time > timestamp)
1310 sched->nr_unordered_timestamps++;
1313 thread__put(migrant);
1317 static void output_lat_thread(struct perf_sched *sched, struct work_atoms *work_list)
1322 char max_lat_at[32];
1324 if (!work_list->nb_atoms)
1327 * Ignore idle threads:
1329 if (!strcmp(thread__comm_str(work_list->thread), "swapper"))
1332 sched->all_runtime += work_list->total_runtime;
1333 sched->all_count += work_list->nb_atoms;
1335 if (work_list->num_merged > 1)
1336 ret = printf(" %s:(%d) ", thread__comm_str(work_list->thread), work_list->num_merged);
1338 ret = printf(" %s:%d ", thread__comm_str(work_list->thread), work_list->thread->tid);
1340 for (i = 0; i < 24 - ret; i++)
1343 avg = work_list->total_lat / work_list->nb_atoms;
1344 timestamp__scnprintf_usec(work_list->max_lat_at, max_lat_at, sizeof(max_lat_at));
1346 printf("|%11.3f ms |%9" PRIu64 " | avg:%9.3f ms | max:%9.3f ms | max at: %13s s\n",
1347 (double)work_list->total_runtime / NSEC_PER_MSEC,
1348 work_list->nb_atoms, (double)avg / NSEC_PER_MSEC,
1349 (double)work_list->max_lat / NSEC_PER_MSEC,
1353 static int pid_cmp(struct work_atoms *l, struct work_atoms *r)
1355 if (l->thread == r->thread)
1357 if (l->thread->tid < r->thread->tid)
1359 if (l->thread->tid > r->thread->tid)
1361 return (int)(l->thread - r->thread);
1364 static int avg_cmp(struct work_atoms *l, struct work_atoms *r)
1374 avgl = l->total_lat / l->nb_atoms;
1375 avgr = r->total_lat / r->nb_atoms;
1385 static int max_cmp(struct work_atoms *l, struct work_atoms *r)
1387 if (l->max_lat < r->max_lat)
1389 if (l->max_lat > r->max_lat)
1395 static int switch_cmp(struct work_atoms *l, struct work_atoms *r)
1397 if (l->nb_atoms < r->nb_atoms)
1399 if (l->nb_atoms > r->nb_atoms)
1405 static int runtime_cmp(struct work_atoms *l, struct work_atoms *r)
1407 if (l->total_runtime < r->total_runtime)
1409 if (l->total_runtime > r->total_runtime)
1415 static int sort_dimension__add(const char *tok, struct list_head *list)
1418 static struct sort_dimension avg_sort_dimension = {
1422 static struct sort_dimension max_sort_dimension = {
1426 static struct sort_dimension pid_sort_dimension = {
1430 static struct sort_dimension runtime_sort_dimension = {
1434 static struct sort_dimension switch_sort_dimension = {
1438 struct sort_dimension *available_sorts[] = {
1439 &pid_sort_dimension,
1440 &avg_sort_dimension,
1441 &max_sort_dimension,
1442 &switch_sort_dimension,
1443 &runtime_sort_dimension,
1446 for (i = 0; i < ARRAY_SIZE(available_sorts); i++) {
1447 if (!strcmp(available_sorts[i]->name, tok)) {
1448 list_add_tail(&available_sorts[i]->list, list);
1457 static void perf_sched__sort_lat(struct perf_sched *sched)
1459 struct rb_node *node;
1460 struct rb_root_cached *root = &sched->atom_root;
1463 struct work_atoms *data;
1464 node = rb_first_cached(root);
1468 rb_erase_cached(node, root);
1469 data = rb_entry(node, struct work_atoms, node);
1470 __thread_latency_insert(&sched->sorted_atom_root, data, &sched->sort_list);
1472 if (root == &sched->atom_root) {
1473 root = &sched->merged_atom_root;
1478 static int process_sched_wakeup_event(struct perf_tool *tool,
1479 struct evsel *evsel,
1480 struct perf_sample *sample,
1481 struct machine *machine)
1483 struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
1485 if (sched->tp_handler->wakeup_event)
1486 return sched->tp_handler->wakeup_event(sched, evsel, sample, machine);
1496 static bool thread__has_color(struct thread *thread)
1498 union map_priv priv = {
1499 .ptr = thread__priv(thread),
1505 static struct thread*
1506 map__findnew_thread(struct perf_sched *sched, struct machine *machine, pid_t pid, pid_t tid)
1508 struct thread *thread = machine__findnew_thread(machine, pid, tid);
1509 union map_priv priv = {
1513 if (!sched->map.color_pids || !thread || thread__priv(thread))
1516 if (thread_map__has(sched->map.color_pids, tid))
1519 thread__set_priv(thread, priv.ptr);
1523 static int map_switch_event(struct perf_sched *sched, struct evsel *evsel,
1524 struct perf_sample *sample, struct machine *machine)
1526 const u32 next_pid = perf_evsel__intval(evsel, sample, "next_pid");
1527 struct thread *sched_in;
1528 struct thread_runtime *tr;
1530 u64 timestamp0, timestamp = sample->time;
1532 int i, this_cpu = sample->cpu;
1534 bool new_cpu = false;
1535 const char *color = PERF_COLOR_NORMAL;
1536 char stimestamp[32];
1538 BUG_ON(this_cpu >= MAX_CPUS || this_cpu < 0);
1540 if (this_cpu > sched->max_cpu)
1541 sched->max_cpu = this_cpu;
1543 if (sched->map.comp) {
1544 cpus_nr = bitmap_weight(sched->map.comp_cpus_mask, MAX_CPUS);
1545 if (!test_and_set_bit(this_cpu, sched->map.comp_cpus_mask)) {
1546 sched->map.comp_cpus[cpus_nr++] = this_cpu;
1550 cpus_nr = sched->max_cpu;
1552 timestamp0 = sched->cpu_last_switched[this_cpu];
1553 sched->cpu_last_switched[this_cpu] = timestamp;
1555 delta = timestamp - timestamp0;
1560 pr_err("hm, delta: %" PRIu64 " < 0 ?\n", delta);
1564 sched_in = map__findnew_thread(sched, machine, -1, next_pid);
1565 if (sched_in == NULL)
1568 tr = thread__get_runtime(sched_in);
1570 thread__put(sched_in);
1574 sched->curr_thread[this_cpu] = thread__get(sched_in);
1579 if (!tr->shortname[0]) {
1580 if (!strcmp(thread__comm_str(sched_in), "swapper")) {
1582 * Don't allocate a letter-number for swapper:0
1583 * as a shortname. Instead, we use '.' for it.
1585 tr->shortname[0] = '.';
1586 tr->shortname[1] = ' ';
1588 tr->shortname[0] = sched->next_shortname1;
1589 tr->shortname[1] = sched->next_shortname2;
1591 if (sched->next_shortname1 < 'Z') {
1592 sched->next_shortname1++;
1594 sched->next_shortname1 = 'A';
1595 if (sched->next_shortname2 < '9')
1596 sched->next_shortname2++;
1598 sched->next_shortname2 = '0';
1604 for (i = 0; i < cpus_nr; i++) {
1605 int cpu = sched->map.comp ? sched->map.comp_cpus[i] : i;
1606 struct thread *curr_thread = sched->curr_thread[cpu];
1607 struct thread_runtime *curr_tr;
1608 const char *pid_color = color;
1609 const char *cpu_color = color;
1611 if (curr_thread && thread__has_color(curr_thread))
1612 pid_color = COLOR_PIDS;
1614 if (sched->map.cpus && !cpu_map__has(sched->map.cpus, cpu))
1617 if (sched->map.color_cpus && cpu_map__has(sched->map.color_cpus, cpu))
1618 cpu_color = COLOR_CPUS;
1620 if (cpu != this_cpu)
1621 color_fprintf(stdout, color, " ");
1623 color_fprintf(stdout, cpu_color, "*");
1625 if (sched->curr_thread[cpu]) {
1626 curr_tr = thread__get_runtime(sched->curr_thread[cpu]);
1627 if (curr_tr == NULL) {
1628 thread__put(sched_in);
1631 color_fprintf(stdout, pid_color, "%2s ", curr_tr->shortname);
1633 color_fprintf(stdout, color, " ");
1636 if (sched->map.cpus && !cpu_map__has(sched->map.cpus, this_cpu))
1639 timestamp__scnprintf_usec(timestamp, stimestamp, sizeof(stimestamp));
1640 color_fprintf(stdout, color, " %12s secs ", stimestamp);
1641 if (new_shortname || tr->comm_changed || (verbose > 0 && sched_in->tid)) {
1642 const char *pid_color = color;
1644 if (thread__has_color(sched_in))
1645 pid_color = COLOR_PIDS;
1647 color_fprintf(stdout, pid_color, "%s => %s:%d",
1648 tr->shortname, thread__comm_str(sched_in), sched_in->tid);
1649 tr->comm_changed = false;
1652 if (sched->map.comp && new_cpu)
1653 color_fprintf(stdout, color, " (CPU %d)", this_cpu);
1656 color_fprintf(stdout, color, "\n");
1658 thread__put(sched_in);
1663 static int process_sched_switch_event(struct perf_tool *tool,
1664 struct evsel *evsel,
1665 struct perf_sample *sample,
1666 struct machine *machine)
1668 struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
1669 int this_cpu = sample->cpu, err = 0;
1670 u32 prev_pid = perf_evsel__intval(evsel, sample, "prev_pid"),
1671 next_pid = perf_evsel__intval(evsel, sample, "next_pid");
1673 if (sched->curr_pid[this_cpu] != (u32)-1) {
1675 * Are we trying to switch away a PID that is
1678 if (sched->curr_pid[this_cpu] != prev_pid)
1679 sched->nr_context_switch_bugs++;
1682 if (sched->tp_handler->switch_event)
1683 err = sched->tp_handler->switch_event(sched, evsel, sample, machine);
1685 sched->curr_pid[this_cpu] = next_pid;
1689 static int process_sched_runtime_event(struct perf_tool *tool,
1690 struct evsel *evsel,
1691 struct perf_sample *sample,
1692 struct machine *machine)
1694 struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
1696 if (sched->tp_handler->runtime_event)
1697 return sched->tp_handler->runtime_event(sched, evsel, sample, machine);
1702 static int perf_sched__process_fork_event(struct perf_tool *tool,
1703 union perf_event *event,
1704 struct perf_sample *sample,
1705 struct machine *machine)
1707 struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
1709 /* run the fork event through the perf machineruy */
1710 perf_event__process_fork(tool, event, sample, machine);
1712 /* and then run additional processing needed for this command */
1713 if (sched->tp_handler->fork_event)
1714 return sched->tp_handler->fork_event(sched, event, machine);
1719 static int process_sched_migrate_task_event(struct perf_tool *tool,
1720 struct evsel *evsel,
1721 struct perf_sample *sample,
1722 struct machine *machine)
1724 struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
1726 if (sched->tp_handler->migrate_task_event)
1727 return sched->tp_handler->migrate_task_event(sched, evsel, sample, machine);
1732 typedef int (*tracepoint_handler)(struct perf_tool *tool,
1733 struct evsel *evsel,
1734 struct perf_sample *sample,
1735 struct machine *machine);
1737 static int perf_sched__process_tracepoint_sample(struct perf_tool *tool __maybe_unused,
1738 union perf_event *event __maybe_unused,
1739 struct perf_sample *sample,
1740 struct evsel *evsel,
1741 struct machine *machine)
1745 if (evsel->handler != NULL) {
1746 tracepoint_handler f = evsel->handler;
1747 err = f(tool, evsel, sample, machine);
1753 static int perf_sched__process_comm(struct perf_tool *tool __maybe_unused,
1754 union perf_event *event,
1755 struct perf_sample *sample,
1756 struct machine *machine)
1758 struct thread *thread;
1759 struct thread_runtime *tr;
1762 err = perf_event__process_comm(tool, event, sample, machine);
1766 thread = machine__find_thread(machine, sample->pid, sample->tid);
1768 pr_err("Internal error: can't find thread\n");
1772 tr = thread__get_runtime(thread);
1774 thread__put(thread);
1778 tr->comm_changed = true;
1779 thread__put(thread);
1784 static int perf_sched__read_events(struct perf_sched *sched)
1786 const struct evsel_str_handler handlers[] = {
1787 { "sched:sched_switch", process_sched_switch_event, },
1788 { "sched:sched_stat_runtime", process_sched_runtime_event, },
1789 { "sched:sched_wakeup", process_sched_wakeup_event, },
1790 { "sched:sched_wakeup_new", process_sched_wakeup_event, },
1791 { "sched:sched_migrate_task", process_sched_migrate_task_event, },
1793 struct perf_session *session;
1794 struct perf_data data = {
1796 .mode = PERF_DATA_MODE_READ,
1797 .force = sched->force,
1801 session = perf_session__new(&data, false, &sched->tool);
1802 if (IS_ERR(session)) {
1803 pr_debug("Error creating perf session");
1804 return PTR_ERR(session);
1807 symbol__init(&session->header.env);
1809 if (perf_session__set_tracepoints_handlers(session, handlers))
1812 if (perf_session__has_traces(session, "record -R")) {
1813 int err = perf_session__process_events(session);
1815 pr_err("Failed to process events, error %d", err);
1819 sched->nr_events = session->evlist->stats.nr_events[0];
1820 sched->nr_lost_events = session->evlist->stats.total_lost;
1821 sched->nr_lost_chunks = session->evlist->stats.nr_events[PERF_RECORD_LOST];
1826 perf_session__delete(session);
1831 * scheduling times are printed as msec.usec
1833 static inline void print_sched_time(unsigned long long nsecs, int width)
1835 unsigned long msecs;
1836 unsigned long usecs;
1838 msecs = nsecs / NSEC_PER_MSEC;
1839 nsecs -= msecs * NSEC_PER_MSEC;
1840 usecs = nsecs / NSEC_PER_USEC;
1841 printf("%*lu.%03lu ", width, msecs, usecs);
1845 * returns runtime data for event, allocating memory for it the
1846 * first time it is used.
1848 static struct evsel_runtime *perf_evsel__get_runtime(struct evsel *evsel)
1850 struct evsel_runtime *r = evsel->priv;
1853 r = zalloc(sizeof(struct evsel_runtime));
1861 * save last time event was seen per cpu
1863 static void perf_evsel__save_time(struct evsel *evsel,
1864 u64 timestamp, u32 cpu)
1866 struct evsel_runtime *r = perf_evsel__get_runtime(evsel);
1871 if ((cpu >= r->ncpu) || (r->last_time == NULL)) {
1872 int i, n = __roundup_pow_of_two(cpu+1);
1873 void *p = r->last_time;
1875 p = realloc(r->last_time, n * sizeof(u64));
1880 for (i = r->ncpu; i < n; ++i)
1881 r->last_time[i] = (u64) 0;
1886 r->last_time[cpu] = timestamp;
1889 /* returns last time this event was seen on the given cpu */
1890 static u64 perf_evsel__get_time(struct evsel *evsel, u32 cpu)
1892 struct evsel_runtime *r = perf_evsel__get_runtime(evsel);
1894 if ((r == NULL) || (r->last_time == NULL) || (cpu >= r->ncpu))
1897 return r->last_time[cpu];
1900 static int comm_width = 30;
1902 static char *timehist_get_commstr(struct thread *thread)
1904 static char str[32];
1905 const char *comm = thread__comm_str(thread);
1906 pid_t tid = thread->tid;
1907 pid_t pid = thread->pid_;
1911 n = scnprintf(str, sizeof(str), "%s", comm);
1913 else if (tid != pid)
1914 n = scnprintf(str, sizeof(str), "%s[%d/%d]", comm, tid, pid);
1917 n = scnprintf(str, sizeof(str), "%s[%d]", comm, tid);
1925 static void timehist_header(struct perf_sched *sched)
1927 u32 ncpus = sched->max_cpu + 1;
1930 printf("%15s %6s ", "time", "cpu");
1932 if (sched->show_cpu_visual) {
1934 for (i = 0, j = 0; i < ncpus; ++i) {
1942 printf(" %-*s %9s %9s %9s", comm_width,
1943 "task name", "wait time", "sch delay", "run time");
1945 if (sched->show_state)
1946 printf(" %s", "state");
1953 printf("%15s %-6s ", "", "");
1955 if (sched->show_cpu_visual)
1956 printf(" %*s ", ncpus, "");
1958 printf(" %-*s %9s %9s %9s", comm_width,
1959 "[tid/pid]", "(msec)", "(msec)", "(msec)");
1961 if (sched->show_state)
1969 printf("%.15s %.6s ", graph_dotted_line, graph_dotted_line);
1971 if (sched->show_cpu_visual)
1972 printf(" %.*s ", ncpus, graph_dotted_line);
1974 printf(" %.*s %.9s %.9s %.9s", comm_width,
1975 graph_dotted_line, graph_dotted_line, graph_dotted_line,
1978 if (sched->show_state)
1979 printf(" %.5s", graph_dotted_line);
1984 static char task_state_char(struct thread *thread, int state)
1986 static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
1987 unsigned bit = state ? ffs(state) : 0;
1990 if (thread->tid == 0)
1993 return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
1996 static void timehist_print_sample(struct perf_sched *sched,
1997 struct evsel *evsel,
1998 struct perf_sample *sample,
1999 struct addr_location *al,
2000 struct thread *thread,
2003 struct thread_runtime *tr = thread__priv(thread);
2004 const char *next_comm = perf_evsel__strval(evsel, sample, "next_comm");
2005 const u32 next_pid = perf_evsel__intval(evsel, sample, "next_pid");
2006 u32 max_cpus = sched->max_cpu + 1;
2011 timestamp__scnprintf_usec(t, tstr, sizeof(tstr));
2012 printf("%15s [%04d] ", tstr, sample->cpu);
2014 if (sched->show_cpu_visual) {
2019 for (i = 0; i < max_cpus; ++i) {
2020 /* flag idle times with 'i'; others are sched events */
2021 if (i == sample->cpu)
2022 c = (thread->tid == 0) ? 'i' : 's';
2030 printf(" %-*s ", comm_width, timehist_get_commstr(thread));
2032 wait_time = tr->dt_sleep + tr->dt_iowait + tr->dt_preempt;
2033 print_sched_time(wait_time, 6);
2035 print_sched_time(tr->dt_delay, 6);
2036 print_sched_time(tr->dt_run, 6);
2038 if (sched->show_state)
2039 printf(" %5c ", task_state_char(thread, state));
2041 if (sched->show_next) {
2042 snprintf(nstr, sizeof(nstr), "next: %s[%d]", next_comm, next_pid);
2043 printf(" %-*s", comm_width, nstr);
2046 if (sched->show_wakeups && !sched->show_next)
2047 printf(" %-*s", comm_width, "");
2049 if (thread->tid == 0)
2052 if (sched->show_callchain)
2055 sample__fprintf_sym(sample, al, 0,
2056 EVSEL__PRINT_SYM | EVSEL__PRINT_ONELINE |
2057 EVSEL__PRINT_CALLCHAIN_ARROW |
2058 EVSEL__PRINT_SKIP_IGNORED,
2059 &callchain_cursor, symbol_conf.bt_stop_list, stdout);
2066 * Explanation of delta-time stats:
2068 * t = time of current schedule out event
2069 * tprev = time of previous sched out event
2070 * also time of schedule-in event for current task
2071 * last_time = time of last sched change event for current task
2072 * (i.e, time process was last scheduled out)
2073 * ready_to_run = time of wakeup for current task
2075 * -----|------------|------------|------------|------
2076 * last ready tprev t
2079 * |-------- dt_wait --------|
2080 * |- dt_delay -|-- dt_run --|
2082 * dt_run = run time of current task
2083 * dt_wait = time between last schedule out event for task and tprev
2084 * represents time spent off the cpu
2085 * dt_delay = time between wakeup and schedule-in of task
2088 static void timehist_update_runtime_stats(struct thread_runtime *r,
2098 r->dt_run = t - tprev;
2099 if (r->ready_to_run) {
2100 if (r->ready_to_run > tprev)
2101 pr_debug("time travel: wakeup time for task > previous sched_switch event\n");
2103 r->dt_delay = tprev - r->ready_to_run;
2106 if (r->last_time > tprev)
2107 pr_debug("time travel: last sched out time for task > previous sched_switch event\n");
2108 else if (r->last_time) {
2109 u64 dt_wait = tprev - r->last_time;
2111 if (r->last_state == TASK_RUNNING)
2112 r->dt_preempt = dt_wait;
2113 else if (r->last_state == TASK_UNINTERRUPTIBLE)
2114 r->dt_iowait = dt_wait;
2116 r->dt_sleep = dt_wait;
2120 update_stats(&r->run_stats, r->dt_run);
2122 r->total_run_time += r->dt_run;
2123 r->total_delay_time += r->dt_delay;
2124 r->total_sleep_time += r->dt_sleep;
2125 r->total_iowait_time += r->dt_iowait;
2126 r->total_preempt_time += r->dt_preempt;
2129 static bool is_idle_sample(struct perf_sample *sample,
2130 struct evsel *evsel)
2132 /* pid 0 == swapper == idle task */
2133 if (strcmp(perf_evsel__name(evsel), "sched:sched_switch") == 0)
2134 return perf_evsel__intval(evsel, sample, "prev_pid") == 0;
2136 return sample->pid == 0;
2139 static void save_task_callchain(struct perf_sched *sched,
2140 struct perf_sample *sample,
2141 struct evsel *evsel,
2142 struct machine *machine)
2144 struct callchain_cursor *cursor = &callchain_cursor;
2145 struct thread *thread;
2147 /* want main thread for process - has maps */
2148 thread = machine__findnew_thread(machine, sample->pid, sample->pid);
2149 if (thread == NULL) {
2150 pr_debug("Failed to get thread for pid %d.\n", sample->pid);
2154 if (!sched->show_callchain || sample->callchain == NULL)
2157 if (thread__resolve_callchain(thread, cursor, evsel, sample,
2158 NULL, NULL, sched->max_stack + 2) != 0) {
2160 pr_err("Failed to resolve callchain. Skipping\n");
2165 callchain_cursor_commit(cursor);
2168 struct callchain_cursor_node *node;
2171 node = callchain_cursor_current(cursor);
2177 if (!strcmp(sym->name, "schedule") ||
2178 !strcmp(sym->name, "__schedule") ||
2179 !strcmp(sym->name, "preempt_schedule"))
2183 callchain_cursor_advance(cursor);
2187 static int init_idle_thread(struct thread *thread)
2189 struct idle_thread_runtime *itr;
2191 thread__set_comm(thread, idle_comm, 0);
2193 itr = zalloc(sizeof(*itr));
2197 init_stats(&itr->tr.run_stats);
2198 callchain_init(&itr->callchain);
2199 callchain_cursor_reset(&itr->cursor);
2200 thread__set_priv(thread, itr);
2206 * Track idle stats per cpu by maintaining a local thread
2207 * struct for the idle task on each cpu.
2209 static int init_idle_threads(int ncpu)
2213 idle_threads = zalloc(ncpu * sizeof(struct thread *));
2217 idle_max_cpu = ncpu;
2219 /* allocate the actual thread struct if needed */
2220 for (i = 0; i < ncpu; ++i) {
2221 idle_threads[i] = thread__new(0, 0);
2222 if (idle_threads[i] == NULL)
2225 ret = init_idle_thread(idle_threads[i]);
2233 static void free_idle_threads(void)
2237 if (idle_threads == NULL)
2240 for (i = 0; i < idle_max_cpu; ++i) {
2241 if ((idle_threads[i]))
2242 thread__delete(idle_threads[i]);
2248 static struct thread *get_idle_thread(int cpu)
2251 * expand/allocate array of pointers to local thread
2254 if ((cpu >= idle_max_cpu) || (idle_threads == NULL)) {
2255 int i, j = __roundup_pow_of_two(cpu+1);
2258 p = realloc(idle_threads, j * sizeof(struct thread *));
2262 idle_threads = (struct thread **) p;
2263 for (i = idle_max_cpu; i < j; ++i)
2264 idle_threads[i] = NULL;
2269 /* allocate a new thread struct if needed */
2270 if (idle_threads[cpu] == NULL) {
2271 idle_threads[cpu] = thread__new(0, 0);
2273 if (idle_threads[cpu]) {
2274 if (init_idle_thread(idle_threads[cpu]) < 0)
2279 return idle_threads[cpu];
2282 static void save_idle_callchain(struct perf_sched *sched,
2283 struct idle_thread_runtime *itr,
2284 struct perf_sample *sample)
2286 if (!sched->show_callchain || sample->callchain == NULL)
2289 callchain_cursor__copy(&itr->cursor, &callchain_cursor);
2292 static struct thread *timehist_get_thread(struct perf_sched *sched,
2293 struct perf_sample *sample,
2294 struct machine *machine,
2295 struct evsel *evsel)
2297 struct thread *thread;
2299 if (is_idle_sample(sample, evsel)) {
2300 thread = get_idle_thread(sample->cpu);
2302 pr_err("Failed to get idle thread for cpu %d.\n", sample->cpu);
2305 /* there were samples with tid 0 but non-zero pid */
2306 thread = machine__findnew_thread(machine, sample->pid,
2307 sample->tid ?: sample->pid);
2308 if (thread == NULL) {
2309 pr_debug("Failed to get thread for tid %d. skipping sample.\n",
2313 save_task_callchain(sched, sample, evsel, machine);
2314 if (sched->idle_hist) {
2315 struct thread *idle;
2316 struct idle_thread_runtime *itr;
2318 idle = get_idle_thread(sample->cpu);
2320 pr_err("Failed to get idle thread for cpu %d.\n", sample->cpu);
2324 itr = thread__priv(idle);
2328 itr->last_thread = thread;
2330 /* copy task callchain when entering to idle */
2331 if (perf_evsel__intval(evsel, sample, "next_pid") == 0)
2332 save_idle_callchain(sched, itr, sample);
2339 static bool timehist_skip_sample(struct perf_sched *sched,
2340 struct thread *thread,
2341 struct evsel *evsel,
2342 struct perf_sample *sample)
2346 if (thread__is_filtered(thread)) {
2348 sched->skipped_samples++;
2351 if (sched->idle_hist) {
2352 if (strcmp(perf_evsel__name(evsel), "sched:sched_switch"))
2354 else if (perf_evsel__intval(evsel, sample, "prev_pid") != 0 &&
2355 perf_evsel__intval(evsel, sample, "next_pid") != 0)
2362 static void timehist_print_wakeup_event(struct perf_sched *sched,
2363 struct evsel *evsel,
2364 struct perf_sample *sample,
2365 struct machine *machine,
2366 struct thread *awakened)
2368 struct thread *thread;
2371 thread = machine__findnew_thread(machine, sample->pid, sample->tid);
2375 /* show wakeup unless both awakee and awaker are filtered */
2376 if (timehist_skip_sample(sched, thread, evsel, sample) &&
2377 timehist_skip_sample(sched, awakened, evsel, sample)) {
2381 timestamp__scnprintf_usec(sample->time, tstr, sizeof(tstr));
2382 printf("%15s [%04d] ", tstr, sample->cpu);
2383 if (sched->show_cpu_visual)
2384 printf(" %*s ", sched->max_cpu + 1, "");
2386 printf(" %-*s ", comm_width, timehist_get_commstr(thread));
2389 printf(" %9s %9s %9s ", "", "", "");
2391 printf("awakened: %s", timehist_get_commstr(awakened));
2396 static int timehist_sched_wakeup_event(struct perf_tool *tool,
2397 union perf_event *event __maybe_unused,
2398 struct evsel *evsel,
2399 struct perf_sample *sample,
2400 struct machine *machine)
2402 struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
2403 struct thread *thread;
2404 struct thread_runtime *tr = NULL;
2405 /* want pid of awakened task not pid in sample */
2406 const u32 pid = perf_evsel__intval(evsel, sample, "pid");
2408 thread = machine__findnew_thread(machine, 0, pid);
2412 tr = thread__get_runtime(thread);
2416 if (tr->ready_to_run == 0)
2417 tr->ready_to_run = sample->time;
2419 /* show wakeups if requested */
2420 if (sched->show_wakeups &&
2421 !perf_time__skip_sample(&sched->ptime, sample->time))
2422 timehist_print_wakeup_event(sched, evsel, sample, machine, thread);
2427 static void timehist_print_migration_event(struct perf_sched *sched,
2428 struct evsel *evsel,
2429 struct perf_sample *sample,
2430 struct machine *machine,
2431 struct thread *migrated)
2433 struct thread *thread;
2435 u32 max_cpus = sched->max_cpu + 1;
2438 if (sched->summary_only)
2441 max_cpus = sched->max_cpu + 1;
2442 ocpu = perf_evsel__intval(evsel, sample, "orig_cpu");
2443 dcpu = perf_evsel__intval(evsel, sample, "dest_cpu");
2445 thread = machine__findnew_thread(machine, sample->pid, sample->tid);
2449 if (timehist_skip_sample(sched, thread, evsel, sample) &&
2450 timehist_skip_sample(sched, migrated, evsel, sample)) {
2454 timestamp__scnprintf_usec(sample->time, tstr, sizeof(tstr));
2455 printf("%15s [%04d] ", tstr, sample->cpu);
2457 if (sched->show_cpu_visual) {
2462 for (i = 0; i < max_cpus; ++i) {
2463 c = (i == sample->cpu) ? 'm' : ' ';
2469 printf(" %-*s ", comm_width, timehist_get_commstr(thread));
2472 printf(" %9s %9s %9s ", "", "", "");
2474 printf("migrated: %s", timehist_get_commstr(migrated));
2475 printf(" cpu %d => %d", ocpu, dcpu);
2480 static int timehist_migrate_task_event(struct perf_tool *tool,
2481 union perf_event *event __maybe_unused,
2482 struct evsel *evsel,
2483 struct perf_sample *sample,
2484 struct machine *machine)
2486 struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
2487 struct thread *thread;
2488 struct thread_runtime *tr = NULL;
2489 /* want pid of migrated task not pid in sample */
2490 const u32 pid = perf_evsel__intval(evsel, sample, "pid");
2492 thread = machine__findnew_thread(machine, 0, pid);
2496 tr = thread__get_runtime(thread);
2502 /* show migrations if requested */
2503 timehist_print_migration_event(sched, evsel, sample, machine, thread);
2508 static int timehist_sched_change_event(struct perf_tool *tool,
2509 union perf_event *event,
2510 struct evsel *evsel,
2511 struct perf_sample *sample,
2512 struct machine *machine)
2514 struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
2515 struct perf_time_interval *ptime = &sched->ptime;
2516 struct addr_location al;
2517 struct thread *thread;
2518 struct thread_runtime *tr = NULL;
2519 u64 tprev, t = sample->time;
2521 int state = perf_evsel__intval(evsel, sample, "prev_state");
2524 if (machine__resolve(machine, &al, sample) < 0) {
2525 pr_err("problem processing %d event. skipping it\n",
2526 event->header.type);
2531 thread = timehist_get_thread(sched, sample, machine, evsel);
2532 if (thread == NULL) {
2537 if (timehist_skip_sample(sched, thread, evsel, sample))
2540 tr = thread__get_runtime(thread);
2546 tprev = perf_evsel__get_time(evsel, sample->cpu);
2549 * If start time given:
2550 * - sample time is under window user cares about - skip sample
2551 * - tprev is under window user cares about - reset to start of window
2553 if (ptime->start && ptime->start > t)
2556 if (tprev && ptime->start > tprev)
2557 tprev = ptime->start;
2560 * If end time given:
2561 * - previous sched event is out of window - we are done
2562 * - sample time is beyond window user cares about - reset it
2563 * to close out stats for time window interest
2566 if (tprev > ptime->end)
2573 if (!sched->idle_hist || thread->tid == 0) {
2574 timehist_update_runtime_stats(tr, t, tprev);
2576 if (sched->idle_hist) {
2577 struct idle_thread_runtime *itr = (void *)tr;
2578 struct thread_runtime *last_tr;
2580 BUG_ON(thread->tid != 0);
2582 if (itr->last_thread == NULL)
2585 /* add current idle time as last thread's runtime */
2586 last_tr = thread__get_runtime(itr->last_thread);
2587 if (last_tr == NULL)
2590 timehist_update_runtime_stats(last_tr, t, tprev);
2592 * remove delta time of last thread as it's not updated
2593 * and otherwise it will show an invalid value next
2594 * time. we only care total run time and run stat.
2596 last_tr->dt_run = 0;
2597 last_tr->dt_delay = 0;
2598 last_tr->dt_sleep = 0;
2599 last_tr->dt_iowait = 0;
2600 last_tr->dt_preempt = 0;
2603 callchain_append(&itr->callchain, &itr->cursor, t - tprev);
2605 itr->last_thread = NULL;
2609 if (!sched->summary_only)
2610 timehist_print_sample(sched, evsel, sample, &al, thread, t, state);
2613 if (sched->hist_time.start == 0 && t >= ptime->start)
2614 sched->hist_time.start = t;
2615 if (ptime->end == 0 || t <= ptime->end)
2616 sched->hist_time.end = t;
2619 /* time of this sched_switch event becomes last time task seen */
2620 tr->last_time = sample->time;
2622 /* last state is used to determine where to account wait time */
2623 tr->last_state = state;
2625 /* sched out event for task so reset ready to run time */
2626 tr->ready_to_run = 0;
2629 perf_evsel__save_time(evsel, sample->time, sample->cpu);
2634 static int timehist_sched_switch_event(struct perf_tool *tool,
2635 union perf_event *event,
2636 struct evsel *evsel,
2637 struct perf_sample *sample,
2638 struct machine *machine __maybe_unused)
2640 return timehist_sched_change_event(tool, event, evsel, sample, machine);
2643 static int process_lost(struct perf_tool *tool __maybe_unused,
2644 union perf_event *event,
2645 struct perf_sample *sample,
2646 struct machine *machine __maybe_unused)
2650 timestamp__scnprintf_usec(sample->time, tstr, sizeof(tstr));
2651 printf("%15s ", tstr);
2652 printf("lost %" PRI_lu64 " events on cpu %d\n", event->lost.lost, sample->cpu);
2658 static void print_thread_runtime(struct thread *t,
2659 struct thread_runtime *r)
2661 double mean = avg_stats(&r->run_stats);
2664 printf("%*s %5d %9" PRIu64 " ",
2665 comm_width, timehist_get_commstr(t), t->ppid,
2666 (u64) r->run_stats.n);
2668 print_sched_time(r->total_run_time, 8);
2669 stddev = rel_stddev_stats(stddev_stats(&r->run_stats), mean);
2670 print_sched_time(r->run_stats.min, 6);
2672 print_sched_time((u64) mean, 6);
2674 print_sched_time(r->run_stats.max, 6);
2676 printf("%5.2f", stddev);
2677 printf(" %5" PRIu64, r->migrations);
2681 static void print_thread_waittime(struct thread *t,
2682 struct thread_runtime *r)
2684 printf("%*s %5d %9" PRIu64 " ",
2685 comm_width, timehist_get_commstr(t), t->ppid,
2686 (u64) r->run_stats.n);
2688 print_sched_time(r->total_run_time, 8);
2689 print_sched_time(r->total_sleep_time, 6);
2691 print_sched_time(r->total_iowait_time, 6);
2693 print_sched_time(r->total_preempt_time, 6);
2695 print_sched_time(r->total_delay_time, 6);
2699 struct total_run_stats {
2700 struct perf_sched *sched;
2706 static int __show_thread_runtime(struct thread *t, void *priv)
2708 struct total_run_stats *stats = priv;
2709 struct thread_runtime *r;
2711 if (thread__is_filtered(t))
2714 r = thread__priv(t);
2715 if (r && r->run_stats.n) {
2716 stats->task_count++;
2717 stats->sched_count += r->run_stats.n;
2718 stats->total_run_time += r->total_run_time;
2720 if (stats->sched->show_state)
2721 print_thread_waittime(t, r);
2723 print_thread_runtime(t, r);
2729 static int show_thread_runtime(struct thread *t, void *priv)
2734 return __show_thread_runtime(t, priv);
2737 static int show_deadthread_runtime(struct thread *t, void *priv)
2742 return __show_thread_runtime(t, priv);
2745 static size_t callchain__fprintf_folded(FILE *fp, struct callchain_node *node)
2747 const char *sep = " <- ";
2748 struct callchain_list *chain;
2756 ret = callchain__fprintf_folded(fp, node->parent);
2759 list_for_each_entry(chain, &node->val, list) {
2760 if (chain->ip >= PERF_CONTEXT_MAX)
2762 if (chain->ms.sym && chain->ms.sym->ignore)
2764 ret += fprintf(fp, "%s%s", first ? "" : sep,
2765 callchain_list__sym_name(chain, bf, sizeof(bf),
2773 static size_t timehist_print_idlehist_callchain(struct rb_root_cached *root)
2777 struct callchain_node *chain;
2778 struct rb_node *rb_node = rb_first_cached(root);
2780 printf(" %16s %8s %s\n", "Idle time (msec)", "Count", "Callchains");
2781 printf(" %.16s %.8s %.50s\n", graph_dotted_line, graph_dotted_line,
2785 chain = rb_entry(rb_node, struct callchain_node, rb_node);
2786 rb_node = rb_next(rb_node);
2788 ret += fprintf(fp, " ");
2789 print_sched_time(chain->hit, 12);
2790 ret += 16; /* print_sched_time returns 2nd arg + 4 */
2791 ret += fprintf(fp, " %8d ", chain->count);
2792 ret += callchain__fprintf_folded(fp, chain);
2793 ret += fprintf(fp, "\n");
2799 static void timehist_print_summary(struct perf_sched *sched,
2800 struct perf_session *session)
2802 struct machine *m = &session->machines.host;
2803 struct total_run_stats totals;
2806 struct thread_runtime *r;
2808 u64 hist_time = sched->hist_time.end - sched->hist_time.start;
2810 memset(&totals, 0, sizeof(totals));
2811 totals.sched = sched;
2813 if (sched->idle_hist) {
2814 printf("\nIdle-time summary\n");
2815 printf("%*s parent sched-out ", comm_width, "comm");
2816 printf(" idle-time min-idle avg-idle max-idle stddev migrations\n");
2817 } else if (sched->show_state) {
2818 printf("\nWait-time summary\n");
2819 printf("%*s parent sched-in ", comm_width, "comm");
2820 printf(" run-time sleep iowait preempt delay\n");
2822 printf("\nRuntime summary\n");
2823 printf("%*s parent sched-in ", comm_width, "comm");
2824 printf(" run-time min-run avg-run max-run stddev migrations\n");
2826 printf("%*s (count) ", comm_width, "");
2827 printf(" (msec) (msec) (msec) (msec) %s\n",
2828 sched->show_state ? "(msec)" : "%");
2829 printf("%.117s\n", graph_dotted_line);
2831 machine__for_each_thread(m, show_thread_runtime, &totals);
2832 task_count = totals.task_count;
2834 printf("<no still running tasks>\n");
2836 printf("\nTerminated tasks:\n");
2837 machine__for_each_thread(m, show_deadthread_runtime, &totals);
2838 if (task_count == totals.task_count)
2839 printf("<no terminated tasks>\n");
2841 /* CPU idle stats not tracked when samples were skipped */
2842 if (sched->skipped_samples && !sched->idle_hist)
2845 printf("\nIdle stats:\n");
2846 for (i = 0; i < idle_max_cpu; ++i) {
2847 t = idle_threads[i];
2851 r = thread__priv(t);
2852 if (r && r->run_stats.n) {
2853 totals.sched_count += r->run_stats.n;
2854 printf(" CPU %2d idle for ", i);
2855 print_sched_time(r->total_run_time, 6);
2856 printf(" msec (%6.2f%%)\n", 100.0 * r->total_run_time / hist_time);
2858 printf(" CPU %2d idle entire time window\n", i);
2861 if (sched->idle_hist && sched->show_callchain) {
2862 callchain_param.mode = CHAIN_FOLDED;
2863 callchain_param.value = CCVAL_PERIOD;
2865 callchain_register_param(&callchain_param);
2867 printf("\nIdle stats by callchain:\n");
2868 for (i = 0; i < idle_max_cpu; ++i) {
2869 struct idle_thread_runtime *itr;
2871 t = idle_threads[i];
2875 itr = thread__priv(t);
2879 callchain_param.sort(&itr->sorted_root.rb_root, &itr->callchain,
2880 0, &callchain_param);
2882 printf(" CPU %2d:", i);
2883 print_sched_time(itr->tr.total_run_time, 6);
2885 timehist_print_idlehist_callchain(&itr->sorted_root);
2891 " Total number of unique tasks: %" PRIu64 "\n"
2892 "Total number of context switches: %" PRIu64 "\n",
2893 totals.task_count, totals.sched_count);
2895 printf(" Total run time (msec): ");
2896 print_sched_time(totals.total_run_time, 2);
2899 printf(" Total scheduling time (msec): ");
2900 print_sched_time(hist_time, 2);
2901 printf(" (x %d)\n", sched->max_cpu);
2904 typedef int (*sched_handler)(struct perf_tool *tool,
2905 union perf_event *event,
2906 struct evsel *evsel,
2907 struct perf_sample *sample,
2908 struct machine *machine);
2910 static int perf_timehist__process_sample(struct perf_tool *tool,
2911 union perf_event *event,
2912 struct perf_sample *sample,
2913 struct evsel *evsel,
2914 struct machine *machine)
2916 struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
2918 int this_cpu = sample->cpu;
2920 if (this_cpu > sched->max_cpu)
2921 sched->max_cpu = this_cpu;
2923 if (evsel->handler != NULL) {
2924 sched_handler f = evsel->handler;
2926 err = f(tool, event, evsel, sample, machine);
2932 static int timehist_check_attr(struct perf_sched *sched,
2933 struct evlist *evlist)
2935 struct evsel *evsel;
2936 struct evsel_runtime *er;
2938 list_for_each_entry(evsel, &evlist->core.entries, core.node) {
2939 er = perf_evsel__get_runtime(evsel);
2941 pr_err("Failed to allocate memory for evsel runtime data\n");
2945 if (sched->show_callchain && !evsel__has_callchain(evsel)) {
2946 pr_info("Samples do not have callchains.\n");
2947 sched->show_callchain = 0;
2948 symbol_conf.use_callchain = 0;
2955 static int perf_sched__timehist(struct perf_sched *sched)
2957 const struct evsel_str_handler handlers[] = {
2958 { "sched:sched_switch", timehist_sched_switch_event, },
2959 { "sched:sched_wakeup", timehist_sched_wakeup_event, },
2960 { "sched:sched_wakeup_new", timehist_sched_wakeup_event, },
2962 const struct evsel_str_handler migrate_handlers[] = {
2963 { "sched:sched_migrate_task", timehist_migrate_task_event, },
2965 struct perf_data data = {
2967 .mode = PERF_DATA_MODE_READ,
2968 .force = sched->force,
2971 struct perf_session *session;
2972 struct evlist *evlist;
2976 * event handlers for timehist option
2978 sched->tool.sample = perf_timehist__process_sample;
2979 sched->tool.mmap = perf_event__process_mmap;
2980 sched->tool.comm = perf_event__process_comm;
2981 sched->tool.exit = perf_event__process_exit;
2982 sched->tool.fork = perf_event__process_fork;
2983 sched->tool.lost = process_lost;
2984 sched->tool.attr = perf_event__process_attr;
2985 sched->tool.tracing_data = perf_event__process_tracing_data;
2986 sched->tool.build_id = perf_event__process_build_id;
2988 sched->tool.ordered_events = true;
2989 sched->tool.ordering_requires_timestamps = true;
2991 symbol_conf.use_callchain = sched->show_callchain;
2993 session = perf_session__new(&data, false, &sched->tool);
2994 if (IS_ERR(session))
2995 return PTR_ERR(session);
2997 evlist = session->evlist;
2999 symbol__init(&session->header.env);
3001 if (perf_time__parse_str(&sched->ptime, sched->time_str) != 0) {
3002 pr_err("Invalid time string\n");
3006 if (timehist_check_attr(sched, evlist) != 0)
3011 /* setup per-evsel handlers */
3012 if (perf_session__set_tracepoints_handlers(session, handlers))
3015 /* sched_switch event at a minimum needs to exist */
3016 if (!perf_evlist__find_tracepoint_by_name(session->evlist,
3017 "sched:sched_switch")) {
3018 pr_err("No sched_switch events found. Have you run 'perf sched record'?\n");
3022 if (sched->show_migrations &&
3023 perf_session__set_tracepoints_handlers(session, migrate_handlers))
3026 /* pre-allocate struct for per-CPU idle stats */
3027 sched->max_cpu = session->header.env.nr_cpus_online;
3028 if (sched->max_cpu == 0)
3030 if (init_idle_threads(sched->max_cpu))
3033 /* summary_only implies summary option, but don't overwrite summary if set */
3034 if (sched->summary_only)
3035 sched->summary = sched->summary_only;
3037 if (!sched->summary_only)
3038 timehist_header(sched);
3040 err = perf_session__process_events(session);
3042 pr_err("Failed to process events, error %d", err);
3046 sched->nr_events = evlist->stats.nr_events[0];
3047 sched->nr_lost_events = evlist->stats.total_lost;
3048 sched->nr_lost_chunks = evlist->stats.nr_events[PERF_RECORD_LOST];
3051 timehist_print_summary(sched, session);
3054 free_idle_threads();
3055 perf_session__delete(session);
3061 static void print_bad_events(struct perf_sched *sched)
3063 if (sched->nr_unordered_timestamps && sched->nr_timestamps) {
3064 printf(" INFO: %.3f%% unordered timestamps (%ld out of %ld)\n",
3065 (double)sched->nr_unordered_timestamps/(double)sched->nr_timestamps*100.0,
3066 sched->nr_unordered_timestamps, sched->nr_timestamps);
3068 if (sched->nr_lost_events && sched->nr_events) {
3069 printf(" INFO: %.3f%% lost events (%ld out of %ld, in %ld chunks)\n",
3070 (double)sched->nr_lost_events/(double)sched->nr_events * 100.0,
3071 sched->nr_lost_events, sched->nr_events, sched->nr_lost_chunks);
3073 if (sched->nr_context_switch_bugs && sched->nr_timestamps) {
3074 printf(" INFO: %.3f%% context switch bugs (%ld out of %ld)",
3075 (double)sched->nr_context_switch_bugs/(double)sched->nr_timestamps*100.0,
3076 sched->nr_context_switch_bugs, sched->nr_timestamps);
3077 if (sched->nr_lost_events)
3078 printf(" (due to lost events?)");
3083 static void __merge_work_atoms(struct rb_root_cached *root, struct work_atoms *data)
3085 struct rb_node **new = &(root->rb_root.rb_node), *parent = NULL;
3086 struct work_atoms *this;
3087 const char *comm = thread__comm_str(data->thread), *this_comm;
3088 bool leftmost = true;
3093 this = container_of(*new, struct work_atoms, node);
3096 this_comm = thread__comm_str(this->thread);
3097 cmp = strcmp(comm, this_comm);
3099 new = &((*new)->rb_left);
3100 } else if (cmp < 0) {
3101 new = &((*new)->rb_right);
3105 this->total_runtime += data->total_runtime;
3106 this->nb_atoms += data->nb_atoms;
3107 this->total_lat += data->total_lat;
3108 list_splice(&data->work_list, &this->work_list);
3109 if (this->max_lat < data->max_lat) {
3110 this->max_lat = data->max_lat;
3111 this->max_lat_at = data->max_lat_at;
3119 rb_link_node(&data->node, parent, new);
3120 rb_insert_color_cached(&data->node, root, leftmost);
3123 static void perf_sched__merge_lat(struct perf_sched *sched)
3125 struct work_atoms *data;
3126 struct rb_node *node;
3128 if (sched->skip_merge)
3131 while ((node = rb_first_cached(&sched->atom_root))) {
3132 rb_erase_cached(node, &sched->atom_root);
3133 data = rb_entry(node, struct work_atoms, node);
3134 __merge_work_atoms(&sched->merged_atom_root, data);
3138 static int perf_sched__lat(struct perf_sched *sched)
3140 struct rb_node *next;
3144 if (perf_sched__read_events(sched))
3147 perf_sched__merge_lat(sched);
3148 perf_sched__sort_lat(sched);
3150 printf("\n -----------------------------------------------------------------------------------------------------------------\n");
3151 printf(" Task | Runtime ms | Switches | Average delay ms | Maximum delay ms | Maximum delay at |\n");
3152 printf(" -----------------------------------------------------------------------------------------------------------------\n");
3154 next = rb_first_cached(&sched->sorted_atom_root);
3157 struct work_atoms *work_list;
3159 work_list = rb_entry(next, struct work_atoms, node);
3160 output_lat_thread(sched, work_list);
3161 next = rb_next(next);
3162 thread__zput(work_list->thread);
3165 printf(" -----------------------------------------------------------------------------------------------------------------\n");
3166 printf(" TOTAL: |%11.3f ms |%9" PRIu64 " |\n",
3167 (double)sched->all_runtime / NSEC_PER_MSEC, sched->all_count);
3169 printf(" ---------------------------------------------------\n");
3171 print_bad_events(sched);
3177 static int setup_map_cpus(struct perf_sched *sched)
3179 struct perf_cpu_map *map;
3181 sched->max_cpu = sysconf(_SC_NPROCESSORS_CONF);
3183 if (sched->map.comp) {
3184 sched->map.comp_cpus = zalloc(sched->max_cpu * sizeof(int));
3185 if (!sched->map.comp_cpus)
3189 if (!sched->map.cpus_str)
3192 map = perf_cpu_map__new(sched->map.cpus_str);
3194 pr_err("failed to get cpus map from %s\n", sched->map.cpus_str);
3198 sched->map.cpus = map;
3202 static int setup_color_pids(struct perf_sched *sched)
3204 struct perf_thread_map *map;
3206 if (!sched->map.color_pids_str)
3209 map = thread_map__new_by_tid_str(sched->map.color_pids_str);
3211 pr_err("failed to get thread map from %s\n", sched->map.color_pids_str);
3215 sched->map.color_pids = map;
3219 static int setup_color_cpus(struct perf_sched *sched)
3221 struct perf_cpu_map *map;
3223 if (!sched->map.color_cpus_str)
3226 map = perf_cpu_map__new(sched->map.color_cpus_str);
3228 pr_err("failed to get thread map from %s\n", sched->map.color_cpus_str);
3232 sched->map.color_cpus = map;
3236 static int perf_sched__map(struct perf_sched *sched)
3238 if (setup_map_cpus(sched))
3241 if (setup_color_pids(sched))
3244 if (setup_color_cpus(sched))
3248 if (perf_sched__read_events(sched))
3250 print_bad_events(sched);
3254 static int perf_sched__replay(struct perf_sched *sched)
3258 calibrate_run_measurement_overhead(sched);
3259 calibrate_sleep_measurement_overhead(sched);
3261 test_calibrations(sched);
3263 if (perf_sched__read_events(sched))
3266 printf("nr_run_events: %ld\n", sched->nr_run_events);
3267 printf("nr_sleep_events: %ld\n", sched->nr_sleep_events);
3268 printf("nr_wakeup_events: %ld\n", sched->nr_wakeup_events);
3270 if (sched->targetless_wakeups)
3271 printf("target-less wakeups: %ld\n", sched->targetless_wakeups);
3272 if (sched->multitarget_wakeups)
3273 printf("multi-target wakeups: %ld\n", sched->multitarget_wakeups);
3274 if (sched->nr_run_events_optimized)
3275 printf("run atoms optimized: %ld\n",
3276 sched->nr_run_events_optimized);
3278 print_task_traces(sched);
3279 add_cross_task_wakeups(sched);
3281 create_tasks(sched);
3282 printf("------------------------------------------------------------\n");
3283 for (i = 0; i < sched->replay_repeat; i++)
3284 run_one_test(sched);
3289 static void setup_sorting(struct perf_sched *sched, const struct option *options,
3290 const char * const usage_msg[])
3292 char *tmp, *tok, *str = strdup(sched->sort_order);
3294 for (tok = strtok_r(str, ", ", &tmp);
3295 tok; tok = strtok_r(NULL, ", ", &tmp)) {
3296 if (sort_dimension__add(tok, &sched->sort_list) < 0) {
3297 usage_with_options_msg(usage_msg, options,
3298 "Unknown --sort key: `%s'", tok);
3304 sort_dimension__add("pid", &sched->cmp_pid);
3307 static int __cmd_record(int argc, const char **argv)
3309 unsigned int rec_argc, i, j;
3310 const char **rec_argv;
3311 const char * const record_args[] = {
3317 "-e", "sched:sched_switch",
3318 "-e", "sched:sched_stat_wait",
3319 "-e", "sched:sched_stat_sleep",
3320 "-e", "sched:sched_stat_iowait",
3321 "-e", "sched:sched_stat_runtime",
3322 "-e", "sched:sched_process_fork",
3323 "-e", "sched:sched_wakeup",
3324 "-e", "sched:sched_wakeup_new",
3325 "-e", "sched:sched_migrate_task",
3328 rec_argc = ARRAY_SIZE(record_args) + argc - 1;
3329 rec_argv = calloc(rec_argc + 1, sizeof(char *));
3331 if (rec_argv == NULL)
3334 for (i = 0; i < ARRAY_SIZE(record_args); i++)
3335 rec_argv[i] = strdup(record_args[i]);
3337 for (j = 1; j < (unsigned int)argc; j++, i++)
3338 rec_argv[i] = argv[j];
3340 BUG_ON(i != rec_argc);
3342 return cmd_record(i, rec_argv);
3345 int cmd_sched(int argc, const char **argv)
3347 static const char default_sort_order[] = "avg, max, switch, runtime";
3348 struct perf_sched sched = {
3350 .sample = perf_sched__process_tracepoint_sample,
3351 .comm = perf_sched__process_comm,
3352 .namespaces = perf_event__process_namespaces,
3353 .lost = perf_event__process_lost,
3354 .fork = perf_sched__process_fork_event,
3355 .ordered_events = true,
3357 .cmp_pid = LIST_HEAD_INIT(sched.cmp_pid),
3358 .sort_list = LIST_HEAD_INIT(sched.sort_list),
3359 .start_work_mutex = PTHREAD_MUTEX_INITIALIZER,
3360 .work_done_wait_mutex = PTHREAD_MUTEX_INITIALIZER,
3361 .sort_order = default_sort_order,
3362 .replay_repeat = 10,
3364 .next_shortname1 = 'A',
3365 .next_shortname2 = '0',
3367 .show_callchain = 1,
3370 const struct option sched_options[] = {
3371 OPT_STRING('i', "input", &input_name, "file",
3373 OPT_INCR('v', "verbose", &verbose,
3374 "be more verbose (show symbol address, etc)"),
3375 OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
3376 "dump raw trace in ASCII"),
3377 OPT_BOOLEAN('f', "force", &sched.force, "don't complain, do it"),
3380 const struct option latency_options[] = {
3381 OPT_STRING('s', "sort", &sched.sort_order, "key[,key2...]",
3382 "sort by key(s): runtime, switch, avg, max"),
3383 OPT_INTEGER('C', "CPU", &sched.profile_cpu,
3384 "CPU to profile on"),
3385 OPT_BOOLEAN('p', "pids", &sched.skip_merge,
3386 "latency stats per pid instead of per comm"),
3387 OPT_PARENT(sched_options)
3389 const struct option replay_options[] = {
3390 OPT_UINTEGER('r', "repeat", &sched.replay_repeat,
3391 "repeat the workload replay N times (-1: infinite)"),
3392 OPT_PARENT(sched_options)
3394 const struct option map_options[] = {
3395 OPT_BOOLEAN(0, "compact", &sched.map.comp,
3396 "map output in compact mode"),
3397 OPT_STRING(0, "color-pids", &sched.map.color_pids_str, "pids",
3398 "highlight given pids in map"),
3399 OPT_STRING(0, "color-cpus", &sched.map.color_cpus_str, "cpus",
3400 "highlight given CPUs in map"),
3401 OPT_STRING(0, "cpus", &sched.map.cpus_str, "cpus",
3402 "display given CPUs in map"),
3403 OPT_PARENT(sched_options)
3405 const struct option timehist_options[] = {
3406 OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
3407 "file", "vmlinux pathname"),
3408 OPT_STRING(0, "kallsyms", &symbol_conf.kallsyms_name,
3409 "file", "kallsyms pathname"),
3410 OPT_BOOLEAN('g', "call-graph", &sched.show_callchain,
3411 "Display call chains if present (default on)"),
3412 OPT_UINTEGER(0, "max-stack", &sched.max_stack,
3413 "Maximum number of functions to display backtrace."),
3414 OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
3415 "Look for files with symbols relative to this directory"),
3416 OPT_BOOLEAN('s', "summary", &sched.summary_only,
3417 "Show only syscall summary with statistics"),
3418 OPT_BOOLEAN('S', "with-summary", &sched.summary,
3419 "Show all syscalls and summary with statistics"),
3420 OPT_BOOLEAN('w', "wakeups", &sched.show_wakeups, "Show wakeup events"),
3421 OPT_BOOLEAN('n', "next", &sched.show_next, "Show next task"),
3422 OPT_BOOLEAN('M', "migrations", &sched.show_migrations, "Show migration events"),
3423 OPT_BOOLEAN('V', "cpu-visual", &sched.show_cpu_visual, "Add CPU visual"),
3424 OPT_BOOLEAN('I', "idle-hist", &sched.idle_hist, "Show idle events only"),
3425 OPT_STRING(0, "time", &sched.time_str, "str",
3426 "Time span for analysis (start,stop)"),
3427 OPT_BOOLEAN(0, "state", &sched.show_state, "Show task state when sched-out"),
3428 OPT_STRING('p', "pid", &symbol_conf.pid_list_str, "pid[,pid...]",
3429 "analyze events only for given process id(s)"),
3430 OPT_STRING('t', "tid", &symbol_conf.tid_list_str, "tid[,tid...]",
3431 "analyze events only for given thread id(s)"),
3432 OPT_PARENT(sched_options)
3435 const char * const latency_usage[] = {
3436 "perf sched latency [<options>]",
3439 const char * const replay_usage[] = {
3440 "perf sched replay [<options>]",
3443 const char * const map_usage[] = {
3444 "perf sched map [<options>]",
3447 const char * const timehist_usage[] = {
3448 "perf sched timehist [<options>]",
3451 const char *const sched_subcommands[] = { "record", "latency", "map",
3454 const char *sched_usage[] = {
3458 struct trace_sched_handler lat_ops = {
3459 .wakeup_event = latency_wakeup_event,
3460 .switch_event = latency_switch_event,
3461 .runtime_event = latency_runtime_event,
3462 .migrate_task_event = latency_migrate_task_event,
3464 struct trace_sched_handler map_ops = {
3465 .switch_event = map_switch_event,
3467 struct trace_sched_handler replay_ops = {
3468 .wakeup_event = replay_wakeup_event,
3469 .switch_event = replay_switch_event,
3470 .fork_event = replay_fork_event,
3474 for (i = 0; i < ARRAY_SIZE(sched.curr_pid); i++)
3475 sched.curr_pid[i] = -1;
3477 argc = parse_options_subcommand(argc, argv, sched_options, sched_subcommands,
3478 sched_usage, PARSE_OPT_STOP_AT_NON_OPTION);
3480 usage_with_options(sched_usage, sched_options);
3483 * Aliased to 'perf script' for now:
3485 if (!strcmp(argv[0], "script"))
3486 return cmd_script(argc, argv);
3488 if (!strncmp(argv[0], "rec", 3)) {
3489 return __cmd_record(argc, argv);
3490 } else if (!strncmp(argv[0], "lat", 3)) {
3491 sched.tp_handler = &lat_ops;
3493 argc = parse_options(argc, argv, latency_options, latency_usage, 0);
3495 usage_with_options(latency_usage, latency_options);
3497 setup_sorting(&sched, latency_options, latency_usage);
3498 return perf_sched__lat(&sched);
3499 } else if (!strcmp(argv[0], "map")) {
3501 argc = parse_options(argc, argv, map_options, map_usage, 0);
3503 usage_with_options(map_usage, map_options);
3505 sched.tp_handler = &map_ops;
3506 setup_sorting(&sched, latency_options, latency_usage);
3507 return perf_sched__map(&sched);
3508 } else if (!strncmp(argv[0], "rep", 3)) {
3509 sched.tp_handler = &replay_ops;
3511 argc = parse_options(argc, argv, replay_options, replay_usage, 0);
3513 usage_with_options(replay_usage, replay_options);
3515 return perf_sched__replay(&sched);
3516 } else if (!strcmp(argv[0], "timehist")) {
3518 argc = parse_options(argc, argv, timehist_options,
3521 usage_with_options(timehist_usage, timehist_options);
3523 if ((sched.show_wakeups || sched.show_next) &&
3524 sched.summary_only) {
3525 pr_err(" Error: -s and -[n|w] are mutually exclusive.\n");
3526 parse_options_usage(timehist_usage, timehist_options, "s", true);
3527 if (sched.show_wakeups)
3528 parse_options_usage(NULL, timehist_options, "w", true);
3529 if (sched.show_next)
3530 parse_options_usage(NULL, timehist_options, "n", true);
3534 return perf_sched__timehist(&sched);
3536 usage_with_options(sched_usage, sched_options);