1 // SPDX-License-Identifier: GPL-2.0
6 #include "util/evlist.h"
7 #include "util/cache.h"
8 #include "util/evsel.h"
9 #include "util/symbol.h"
10 #include "util/thread.h"
11 #include "util/header.h"
12 #include "util/session.h"
13 #include "util/tool.h"
14 #include "util/cloexec.h"
15 #include "util/thread_map.h"
16 #include "util/color.h"
17 #include "util/stat.h"
18 #include "util/callchain.h"
19 #include "util/time-utils.h"
21 #include <subcmd/parse-options.h>
22 #include "util/trace-event.h"
24 #include "util/debug.h"
26 #include <linux/kernel.h>
27 #include <linux/log2.h>
28 #include <sys/prctl.h>
29 #include <sys/resource.h>
33 #include <semaphore.h>
36 #include <api/fs/fs.h>
37 #include <linux/time64.h>
39 #include "sane_ctype.h"
41 #define PR_SET_NAME 15 /* Set process name */
45 #define MAX_PID 1024000
54 unsigned long nr_events;
55 unsigned long curr_event;
56 struct sched_atom **atoms;
67 enum sched_event_type {
71 SCHED_EVENT_MIGRATION,
75 enum sched_event_type type;
81 struct task_desc *wakee;
84 #define TASK_STATE_TO_CHAR_STR "RSDTtZXxKWP"
86 /* task state bitmask, copied from include/linux/sched.h */
87 #define TASK_RUNNING 0
88 #define TASK_INTERRUPTIBLE 1
89 #define TASK_UNINTERRUPTIBLE 2
90 #define __TASK_STOPPED 4
91 #define __TASK_TRACED 8
92 /* in tsk->exit_state */
94 #define EXIT_ZOMBIE 32
95 #define EXIT_TRACE (EXIT_ZOMBIE | EXIT_DEAD)
96 /* in tsk->state again */
98 #define TASK_WAKEKILL 128
99 #define TASK_WAKING 256
100 #define TASK_PARKED 512
110 struct list_head list;
111 enum thread_state state;
119 struct list_head work_list;
120 struct thread *thread;
130 typedef int (*sort_fn_t)(struct work_atoms *, struct work_atoms *);
134 struct trace_sched_handler {
135 int (*switch_event)(struct perf_sched *sched, struct perf_evsel *evsel,
136 struct perf_sample *sample, struct machine *machine);
138 int (*runtime_event)(struct perf_sched *sched, struct perf_evsel *evsel,
139 struct perf_sample *sample, struct machine *machine);
141 int (*wakeup_event)(struct perf_sched *sched, struct perf_evsel *evsel,
142 struct perf_sample *sample, struct machine *machine);
144 /* PERF_RECORD_FORK event, not sched_process_fork tracepoint */
145 int (*fork_event)(struct perf_sched *sched, union perf_event *event,
146 struct machine *machine);
148 int (*migrate_task_event)(struct perf_sched *sched,
149 struct perf_evsel *evsel,
150 struct perf_sample *sample,
151 struct machine *machine);
154 #define COLOR_PIDS PERF_COLOR_BLUE
155 #define COLOR_CPUS PERF_COLOR_BG_RED
157 struct perf_sched_map {
158 DECLARE_BITMAP(comp_cpus_mask, MAX_CPUS);
161 struct thread_map *color_pids;
162 const char *color_pids_str;
163 struct cpu_map *color_cpus;
164 const char *color_cpus_str;
165 struct cpu_map *cpus;
166 const char *cpus_str;
170 struct perf_tool tool;
171 const char *sort_order;
172 unsigned long nr_tasks;
173 struct task_desc **pid_to_task;
174 struct task_desc **tasks;
175 const struct trace_sched_handler *tp_handler;
176 pthread_mutex_t start_work_mutex;
177 pthread_mutex_t work_done_wait_mutex;
180 * Track the current task - that way we can know whether there's any
181 * weird events, such as a task being switched away that is not current.
184 u32 curr_pid[MAX_CPUS];
185 struct thread *curr_thread[MAX_CPUS];
186 char next_shortname1;
187 char next_shortname2;
188 unsigned int replay_repeat;
189 unsigned long nr_run_events;
190 unsigned long nr_sleep_events;
191 unsigned long nr_wakeup_events;
192 unsigned long nr_sleep_corrections;
193 unsigned long nr_run_events_optimized;
194 unsigned long targetless_wakeups;
195 unsigned long multitarget_wakeups;
196 unsigned long nr_runs;
197 unsigned long nr_timestamps;
198 unsigned long nr_unordered_timestamps;
199 unsigned long nr_context_switch_bugs;
200 unsigned long nr_events;
201 unsigned long nr_lost_chunks;
202 unsigned long nr_lost_events;
203 u64 run_measurement_overhead;
204 u64 sleep_measurement_overhead;
207 u64 runavg_cpu_usage;
208 u64 parent_cpu_usage;
209 u64 runavg_parent_cpu_usage;
215 u64 cpu_last_switched[MAX_CPUS];
216 struct rb_root atom_root, sorted_atom_root, merged_atom_root;
217 struct list_head sort_list, cmp_pid;
220 struct perf_sched_map map;
222 /* options for timehist command */
227 unsigned int max_stack;
228 bool show_cpu_visual;
231 bool show_migrations;
234 const char *time_str;
235 struct perf_time_interval ptime;
236 struct perf_time_interval hist_time;
239 /* per thread run time data */
240 struct thread_runtime {
241 u64 last_time; /* time of previous sched in/out event */
242 u64 dt_run; /* run time */
243 u64 dt_sleep; /* time between CPU access by sleep (off cpu) */
244 u64 dt_iowait; /* time between CPU access by iowait (off cpu) */
245 u64 dt_preempt; /* time between CPU access by preempt (off cpu) */
246 u64 dt_delay; /* time between wakeup and sched-in */
247 u64 ready_to_run; /* time of wakeup */
249 struct stats run_stats;
251 u64 total_sleep_time;
252 u64 total_iowait_time;
253 u64 total_preempt_time;
254 u64 total_delay_time;
260 /* per event run time data */
261 struct evsel_runtime {
262 u64 *last_time; /* time this event was last seen per cpu */
263 u32 ncpu; /* highest cpu slot allocated */
266 /* per cpu idle time data */
267 struct idle_thread_runtime {
268 struct thread_runtime tr;
269 struct thread *last_thread;
270 struct rb_root sorted_root;
271 struct callchain_root callchain;
272 struct callchain_cursor cursor;
275 /* track idle times per cpu */
276 static struct thread **idle_threads;
277 static int idle_max_cpu;
278 static char idle_comm[] = "<idle>";
280 static u64 get_nsecs(void)
284 clock_gettime(CLOCK_MONOTONIC, &ts);
286 return ts.tv_sec * NSEC_PER_SEC + ts.tv_nsec;
289 static void burn_nsecs(struct perf_sched *sched, u64 nsecs)
291 u64 T0 = get_nsecs(), T1;
295 } while (T1 + sched->run_measurement_overhead < T0 + nsecs);
298 static void sleep_nsecs(u64 nsecs)
302 ts.tv_nsec = nsecs % 999999999;
303 ts.tv_sec = nsecs / 999999999;
305 nanosleep(&ts, NULL);
308 static void calibrate_run_measurement_overhead(struct perf_sched *sched)
310 u64 T0, T1, delta, min_delta = NSEC_PER_SEC;
313 for (i = 0; i < 10; i++) {
315 burn_nsecs(sched, 0);
318 min_delta = min(min_delta, delta);
320 sched->run_measurement_overhead = min_delta;
322 printf("run measurement overhead: %" PRIu64 " nsecs\n", min_delta);
325 static void calibrate_sleep_measurement_overhead(struct perf_sched *sched)
327 u64 T0, T1, delta, min_delta = NSEC_PER_SEC;
330 for (i = 0; i < 10; i++) {
335 min_delta = min(min_delta, delta);
338 sched->sleep_measurement_overhead = min_delta;
340 printf("sleep measurement overhead: %" PRIu64 " nsecs\n", min_delta);
343 static struct sched_atom *
344 get_new_event(struct task_desc *task, u64 timestamp)
346 struct sched_atom *event = zalloc(sizeof(*event));
347 unsigned long idx = task->nr_events;
350 event->timestamp = timestamp;
354 size = sizeof(struct sched_atom *) * task->nr_events;
355 task->atoms = realloc(task->atoms, size);
356 BUG_ON(!task->atoms);
358 task->atoms[idx] = event;
363 static struct sched_atom *last_event(struct task_desc *task)
365 if (!task->nr_events)
368 return task->atoms[task->nr_events - 1];
371 static void add_sched_event_run(struct perf_sched *sched, struct task_desc *task,
372 u64 timestamp, u64 duration)
374 struct sched_atom *event, *curr_event = last_event(task);
377 * optimize an existing RUN event by merging this one
380 if (curr_event && curr_event->type == SCHED_EVENT_RUN) {
381 sched->nr_run_events_optimized++;
382 curr_event->duration += duration;
386 event = get_new_event(task, timestamp);
388 event->type = SCHED_EVENT_RUN;
389 event->duration = duration;
391 sched->nr_run_events++;
394 static void add_sched_event_wakeup(struct perf_sched *sched, struct task_desc *task,
395 u64 timestamp, struct task_desc *wakee)
397 struct sched_atom *event, *wakee_event;
399 event = get_new_event(task, timestamp);
400 event->type = SCHED_EVENT_WAKEUP;
401 event->wakee = wakee;
403 wakee_event = last_event(wakee);
404 if (!wakee_event || wakee_event->type != SCHED_EVENT_SLEEP) {
405 sched->targetless_wakeups++;
408 if (wakee_event->wait_sem) {
409 sched->multitarget_wakeups++;
413 wakee_event->wait_sem = zalloc(sizeof(*wakee_event->wait_sem));
414 sem_init(wakee_event->wait_sem, 0, 0);
415 wakee_event->specific_wait = 1;
416 event->wait_sem = wakee_event->wait_sem;
418 sched->nr_wakeup_events++;
421 static void add_sched_event_sleep(struct perf_sched *sched, struct task_desc *task,
422 u64 timestamp, u64 task_state __maybe_unused)
424 struct sched_atom *event = get_new_event(task, timestamp);
426 event->type = SCHED_EVENT_SLEEP;
428 sched->nr_sleep_events++;
431 static struct task_desc *register_pid(struct perf_sched *sched,
432 unsigned long pid, const char *comm)
434 struct task_desc *task;
437 if (sched->pid_to_task == NULL) {
438 if (sysctl__read_int("kernel/pid_max", &pid_max) < 0)
440 BUG_ON((sched->pid_to_task = calloc(pid_max, sizeof(struct task_desc *))) == NULL);
442 if (pid >= (unsigned long)pid_max) {
443 BUG_ON((sched->pid_to_task = realloc(sched->pid_to_task, (pid + 1) *
444 sizeof(struct task_desc *))) == NULL);
445 while (pid >= (unsigned long)pid_max)
446 sched->pid_to_task[pid_max++] = NULL;
449 task = sched->pid_to_task[pid];
454 task = zalloc(sizeof(*task));
456 task->nr = sched->nr_tasks;
457 strcpy(task->comm, comm);
459 * every task starts in sleeping state - this gets ignored
460 * if there's no wakeup pointing to this sleep state:
462 add_sched_event_sleep(sched, task, 0, 0);
464 sched->pid_to_task[pid] = task;
466 sched->tasks = realloc(sched->tasks, sched->nr_tasks * sizeof(struct task_desc *));
467 BUG_ON(!sched->tasks);
468 sched->tasks[task->nr] = task;
471 printf("registered task #%ld, PID %ld (%s)\n", sched->nr_tasks, pid, comm);
477 static void print_task_traces(struct perf_sched *sched)
479 struct task_desc *task;
482 for (i = 0; i < sched->nr_tasks; i++) {
483 task = sched->tasks[i];
484 printf("task %6ld (%20s:%10ld), nr_events: %ld\n",
485 task->nr, task->comm, task->pid, task->nr_events);
489 static void add_cross_task_wakeups(struct perf_sched *sched)
491 struct task_desc *task1, *task2;
494 for (i = 0; i < sched->nr_tasks; i++) {
495 task1 = sched->tasks[i];
497 if (j == sched->nr_tasks)
499 task2 = sched->tasks[j];
500 add_sched_event_wakeup(sched, task1, 0, task2);
504 static void perf_sched__process_event(struct perf_sched *sched,
505 struct sched_atom *atom)
509 switch (atom->type) {
510 case SCHED_EVENT_RUN:
511 burn_nsecs(sched, atom->duration);
513 case SCHED_EVENT_SLEEP:
515 ret = sem_wait(atom->wait_sem);
518 case SCHED_EVENT_WAKEUP:
520 ret = sem_post(atom->wait_sem);
523 case SCHED_EVENT_MIGRATION:
530 static u64 get_cpu_usage_nsec_parent(void)
536 err = getrusage(RUSAGE_SELF, &ru);
539 sum = ru.ru_utime.tv_sec * NSEC_PER_SEC + ru.ru_utime.tv_usec * NSEC_PER_USEC;
540 sum += ru.ru_stime.tv_sec * NSEC_PER_SEC + ru.ru_stime.tv_usec * NSEC_PER_USEC;
545 static int self_open_counters(struct perf_sched *sched, unsigned long cur_task)
547 struct perf_event_attr attr;
548 char sbuf[STRERR_BUFSIZE], info[STRERR_BUFSIZE];
551 bool need_privilege = false;
553 memset(&attr, 0, sizeof(attr));
555 attr.type = PERF_TYPE_SOFTWARE;
556 attr.config = PERF_COUNT_SW_TASK_CLOCK;
559 fd = sys_perf_event_open(&attr, 0, -1, -1,
560 perf_event_open_cloexec_flag());
563 if (errno == EMFILE) {
565 BUG_ON(getrlimit(RLIMIT_NOFILE, &limit) == -1);
566 limit.rlim_cur += sched->nr_tasks - cur_task;
567 if (limit.rlim_cur > limit.rlim_max) {
568 limit.rlim_max = limit.rlim_cur;
569 need_privilege = true;
571 if (setrlimit(RLIMIT_NOFILE, &limit) == -1) {
572 if (need_privilege && errno == EPERM)
573 strcpy(info, "Need privilege\n");
577 strcpy(info, "Have a try with -f option\n");
579 pr_err("Error: sys_perf_event_open() syscall returned "
580 "with %d (%s)\n%s", fd,
581 str_error_r(errno, sbuf, sizeof(sbuf)), info);
587 static u64 get_cpu_usage_nsec_self(int fd)
592 ret = read(fd, &runtime, sizeof(runtime));
593 BUG_ON(ret != sizeof(runtime));
598 struct sched_thread_parms {
599 struct task_desc *task;
600 struct perf_sched *sched;
604 static void *thread_func(void *ctx)
606 struct sched_thread_parms *parms = ctx;
607 struct task_desc *this_task = parms->task;
608 struct perf_sched *sched = parms->sched;
609 u64 cpu_usage_0, cpu_usage_1;
610 unsigned long i, ret;
616 sprintf(comm2, ":%s", this_task->comm);
617 prctl(PR_SET_NAME, comm2);
621 ret = sem_post(&this_task->ready_for_work);
623 ret = pthread_mutex_lock(&sched->start_work_mutex);
625 ret = pthread_mutex_unlock(&sched->start_work_mutex);
628 cpu_usage_0 = get_cpu_usage_nsec_self(fd);
630 for (i = 0; i < this_task->nr_events; i++) {
631 this_task->curr_event = i;
632 perf_sched__process_event(sched, this_task->atoms[i]);
635 cpu_usage_1 = get_cpu_usage_nsec_self(fd);
636 this_task->cpu_usage = cpu_usage_1 - cpu_usage_0;
637 ret = sem_post(&this_task->work_done_sem);
640 ret = pthread_mutex_lock(&sched->work_done_wait_mutex);
642 ret = pthread_mutex_unlock(&sched->work_done_wait_mutex);
648 static void create_tasks(struct perf_sched *sched)
650 struct task_desc *task;
655 err = pthread_attr_init(&attr);
657 err = pthread_attr_setstacksize(&attr,
658 (size_t) max(16 * 1024, PTHREAD_STACK_MIN));
660 err = pthread_mutex_lock(&sched->start_work_mutex);
662 err = pthread_mutex_lock(&sched->work_done_wait_mutex);
664 for (i = 0; i < sched->nr_tasks; i++) {
665 struct sched_thread_parms *parms = malloc(sizeof(*parms));
666 BUG_ON(parms == NULL);
667 parms->task = task = sched->tasks[i];
668 parms->sched = sched;
669 parms->fd = self_open_counters(sched, i);
670 sem_init(&task->sleep_sem, 0, 0);
671 sem_init(&task->ready_for_work, 0, 0);
672 sem_init(&task->work_done_sem, 0, 0);
673 task->curr_event = 0;
674 err = pthread_create(&task->thread, &attr, thread_func, parms);
679 static void wait_for_tasks(struct perf_sched *sched)
681 u64 cpu_usage_0, cpu_usage_1;
682 struct task_desc *task;
683 unsigned long i, ret;
685 sched->start_time = get_nsecs();
686 sched->cpu_usage = 0;
687 pthread_mutex_unlock(&sched->work_done_wait_mutex);
689 for (i = 0; i < sched->nr_tasks; i++) {
690 task = sched->tasks[i];
691 ret = sem_wait(&task->ready_for_work);
693 sem_init(&task->ready_for_work, 0, 0);
695 ret = pthread_mutex_lock(&sched->work_done_wait_mutex);
698 cpu_usage_0 = get_cpu_usage_nsec_parent();
700 pthread_mutex_unlock(&sched->start_work_mutex);
702 for (i = 0; i < sched->nr_tasks; i++) {
703 task = sched->tasks[i];
704 ret = sem_wait(&task->work_done_sem);
706 sem_init(&task->work_done_sem, 0, 0);
707 sched->cpu_usage += task->cpu_usage;
711 cpu_usage_1 = get_cpu_usage_nsec_parent();
712 if (!sched->runavg_cpu_usage)
713 sched->runavg_cpu_usage = sched->cpu_usage;
714 sched->runavg_cpu_usage = (sched->runavg_cpu_usage * (sched->replay_repeat - 1) + sched->cpu_usage) / sched->replay_repeat;
716 sched->parent_cpu_usage = cpu_usage_1 - cpu_usage_0;
717 if (!sched->runavg_parent_cpu_usage)
718 sched->runavg_parent_cpu_usage = sched->parent_cpu_usage;
719 sched->runavg_parent_cpu_usage = (sched->runavg_parent_cpu_usage * (sched->replay_repeat - 1) +
720 sched->parent_cpu_usage)/sched->replay_repeat;
722 ret = pthread_mutex_lock(&sched->start_work_mutex);
725 for (i = 0; i < sched->nr_tasks; i++) {
726 task = sched->tasks[i];
727 sem_init(&task->sleep_sem, 0, 0);
728 task->curr_event = 0;
732 static void run_one_test(struct perf_sched *sched)
734 u64 T0, T1, delta, avg_delta, fluct;
737 wait_for_tasks(sched);
741 sched->sum_runtime += delta;
744 avg_delta = sched->sum_runtime / sched->nr_runs;
745 if (delta < avg_delta)
746 fluct = avg_delta - delta;
748 fluct = delta - avg_delta;
749 sched->sum_fluct += fluct;
751 sched->run_avg = delta;
752 sched->run_avg = (sched->run_avg * (sched->replay_repeat - 1) + delta) / sched->replay_repeat;
754 printf("#%-3ld: %0.3f, ", sched->nr_runs, (double)delta / NSEC_PER_MSEC);
756 printf("ravg: %0.2f, ", (double)sched->run_avg / NSEC_PER_MSEC);
758 printf("cpu: %0.2f / %0.2f",
759 (double)sched->cpu_usage / NSEC_PER_MSEC, (double)sched->runavg_cpu_usage / NSEC_PER_MSEC);
763 * rusage statistics done by the parent, these are less
764 * accurate than the sched->sum_exec_runtime based statistics:
766 printf(" [%0.2f / %0.2f]",
767 (double)sched->parent_cpu_usage / NSEC_PER_MSEC,
768 (double)sched->runavg_parent_cpu_usage / NSEC_PER_MSEC);
773 if (sched->nr_sleep_corrections)
774 printf(" (%ld sleep corrections)\n", sched->nr_sleep_corrections);
775 sched->nr_sleep_corrections = 0;
778 static void test_calibrations(struct perf_sched *sched)
783 burn_nsecs(sched, NSEC_PER_MSEC);
786 printf("the run test took %" PRIu64 " nsecs\n", T1 - T0);
789 sleep_nsecs(NSEC_PER_MSEC);
792 printf("the sleep test took %" PRIu64 " nsecs\n", T1 - T0);
796 replay_wakeup_event(struct perf_sched *sched,
797 struct perf_evsel *evsel, struct perf_sample *sample,
798 struct machine *machine __maybe_unused)
800 const char *comm = perf_evsel__strval(evsel, sample, "comm");
801 const u32 pid = perf_evsel__intval(evsel, sample, "pid");
802 struct task_desc *waker, *wakee;
805 printf("sched_wakeup event %p\n", evsel);
807 printf(" ... pid %d woke up %s/%d\n", sample->tid, comm, pid);
810 waker = register_pid(sched, sample->tid, "<unknown>");
811 wakee = register_pid(sched, pid, comm);
813 add_sched_event_wakeup(sched, waker, sample->time, wakee);
817 static int replay_switch_event(struct perf_sched *sched,
818 struct perf_evsel *evsel,
819 struct perf_sample *sample,
820 struct machine *machine __maybe_unused)
822 const char *prev_comm = perf_evsel__strval(evsel, sample, "prev_comm"),
823 *next_comm = perf_evsel__strval(evsel, sample, "next_comm");
824 const u32 prev_pid = perf_evsel__intval(evsel, sample, "prev_pid"),
825 next_pid = perf_evsel__intval(evsel, sample, "next_pid");
826 const u64 prev_state = perf_evsel__intval(evsel, sample, "prev_state");
827 struct task_desc *prev, __maybe_unused *next;
828 u64 timestamp0, timestamp = sample->time;
829 int cpu = sample->cpu;
833 printf("sched_switch event %p\n", evsel);
835 if (cpu >= MAX_CPUS || cpu < 0)
838 timestamp0 = sched->cpu_last_switched[cpu];
840 delta = timestamp - timestamp0;
845 pr_err("hm, delta: %" PRIu64 " < 0 ?\n", delta);
849 pr_debug(" ... switch from %s/%d to %s/%d [ran %" PRIu64 " nsecs]\n",
850 prev_comm, prev_pid, next_comm, next_pid, delta);
852 prev = register_pid(sched, prev_pid, prev_comm);
853 next = register_pid(sched, next_pid, next_comm);
855 sched->cpu_last_switched[cpu] = timestamp;
857 add_sched_event_run(sched, prev, timestamp, delta);
858 add_sched_event_sleep(sched, prev, timestamp, prev_state);
863 static int replay_fork_event(struct perf_sched *sched,
864 union perf_event *event,
865 struct machine *machine)
867 struct thread *child, *parent;
869 child = machine__findnew_thread(machine, event->fork.pid,
871 parent = machine__findnew_thread(machine, event->fork.ppid,
874 if (child == NULL || parent == NULL) {
875 pr_debug("thread does not exist on fork event: child %p, parent %p\n",
881 printf("fork event\n");
882 printf("... parent: %s/%d\n", thread__comm_str(parent), parent->tid);
883 printf("... child: %s/%d\n", thread__comm_str(child), child->tid);
886 register_pid(sched, parent->tid, thread__comm_str(parent));
887 register_pid(sched, child->tid, thread__comm_str(child));
894 struct sort_dimension {
897 struct list_head list;
901 thread_lat_cmp(struct list_head *list, struct work_atoms *l, struct work_atoms *r)
903 struct sort_dimension *sort;
906 BUG_ON(list_empty(list));
908 list_for_each_entry(sort, list, list) {
909 ret = sort->cmp(l, r);
917 static struct work_atoms *
918 thread_atoms_search(struct rb_root *root, struct thread *thread,
919 struct list_head *sort_list)
921 struct rb_node *node = root->rb_node;
922 struct work_atoms key = { .thread = thread };
925 struct work_atoms *atoms;
928 atoms = container_of(node, struct work_atoms, node);
930 cmp = thread_lat_cmp(sort_list, &key, atoms);
932 node = node->rb_left;
934 node = node->rb_right;
936 BUG_ON(thread != atoms->thread);
944 __thread_latency_insert(struct rb_root *root, struct work_atoms *data,
945 struct list_head *sort_list)
947 struct rb_node **new = &(root->rb_node), *parent = NULL;
950 struct work_atoms *this;
953 this = container_of(*new, struct work_atoms, node);
956 cmp = thread_lat_cmp(sort_list, data, this);
959 new = &((*new)->rb_left);
961 new = &((*new)->rb_right);
964 rb_link_node(&data->node, parent, new);
965 rb_insert_color(&data->node, root);
968 static int thread_atoms_insert(struct perf_sched *sched, struct thread *thread)
970 struct work_atoms *atoms = zalloc(sizeof(*atoms));
972 pr_err("No memory at %s\n", __func__);
976 atoms->thread = thread__get(thread);
977 INIT_LIST_HEAD(&atoms->work_list);
978 __thread_latency_insert(&sched->atom_root, atoms, &sched->cmp_pid);
982 static char sched_out_state(u64 prev_state)
984 const char *str = TASK_STATE_TO_CHAR_STR;
986 return str[prev_state];
990 add_sched_out_event(struct work_atoms *atoms,
994 struct work_atom *atom = zalloc(sizeof(*atom));
996 pr_err("Non memory at %s", __func__);
1000 atom->sched_out_time = timestamp;
1002 if (run_state == 'R') {
1003 atom->state = THREAD_WAIT_CPU;
1004 atom->wake_up_time = atom->sched_out_time;
1007 list_add_tail(&atom->list, &atoms->work_list);
1012 add_runtime_event(struct work_atoms *atoms, u64 delta,
1013 u64 timestamp __maybe_unused)
1015 struct work_atom *atom;
1017 BUG_ON(list_empty(&atoms->work_list));
1019 atom = list_entry(atoms->work_list.prev, struct work_atom, list);
1021 atom->runtime += delta;
1022 atoms->total_runtime += delta;
1026 add_sched_in_event(struct work_atoms *atoms, u64 timestamp)
1028 struct work_atom *atom;
1031 if (list_empty(&atoms->work_list))
1034 atom = list_entry(atoms->work_list.prev, struct work_atom, list);
1036 if (atom->state != THREAD_WAIT_CPU)
1039 if (timestamp < atom->wake_up_time) {
1040 atom->state = THREAD_IGNORE;
1044 atom->state = THREAD_SCHED_IN;
1045 atom->sched_in_time = timestamp;
1047 delta = atom->sched_in_time - atom->wake_up_time;
1048 atoms->total_lat += delta;
1049 if (delta > atoms->max_lat) {
1050 atoms->max_lat = delta;
1051 atoms->max_lat_at = timestamp;
1056 static int latency_switch_event(struct perf_sched *sched,
1057 struct perf_evsel *evsel,
1058 struct perf_sample *sample,
1059 struct machine *machine)
1061 const u32 prev_pid = perf_evsel__intval(evsel, sample, "prev_pid"),
1062 next_pid = perf_evsel__intval(evsel, sample, "next_pid");
1063 const u64 prev_state = perf_evsel__intval(evsel, sample, "prev_state");
1064 struct work_atoms *out_events, *in_events;
1065 struct thread *sched_out, *sched_in;
1066 u64 timestamp0, timestamp = sample->time;
1067 int cpu = sample->cpu, err = -1;
1070 BUG_ON(cpu >= MAX_CPUS || cpu < 0);
1072 timestamp0 = sched->cpu_last_switched[cpu];
1073 sched->cpu_last_switched[cpu] = timestamp;
1075 delta = timestamp - timestamp0;
1080 pr_err("hm, delta: %" PRIu64 " < 0 ?\n", delta);
1084 sched_out = machine__findnew_thread(machine, -1, prev_pid);
1085 sched_in = machine__findnew_thread(machine, -1, next_pid);
1086 if (sched_out == NULL || sched_in == NULL)
1089 out_events = thread_atoms_search(&sched->atom_root, sched_out, &sched->cmp_pid);
1091 if (thread_atoms_insert(sched, sched_out))
1093 out_events = thread_atoms_search(&sched->atom_root, sched_out, &sched->cmp_pid);
1095 pr_err("out-event: Internal tree error");
1099 if (add_sched_out_event(out_events, sched_out_state(prev_state), timestamp))
1102 in_events = thread_atoms_search(&sched->atom_root, sched_in, &sched->cmp_pid);
1104 if (thread_atoms_insert(sched, sched_in))
1106 in_events = thread_atoms_search(&sched->atom_root, sched_in, &sched->cmp_pid);
1108 pr_err("in-event: Internal tree error");
1112 * Take came in we have not heard about yet,
1113 * add in an initial atom in runnable state:
1115 if (add_sched_out_event(in_events, 'R', timestamp))
1118 add_sched_in_event(in_events, timestamp);
1121 thread__put(sched_out);
1122 thread__put(sched_in);
1126 static int latency_runtime_event(struct perf_sched *sched,
1127 struct perf_evsel *evsel,
1128 struct perf_sample *sample,
1129 struct machine *machine)
1131 const u32 pid = perf_evsel__intval(evsel, sample, "pid");
1132 const u64 runtime = perf_evsel__intval(evsel, sample, "runtime");
1133 struct thread *thread = machine__findnew_thread(machine, -1, pid);
1134 struct work_atoms *atoms = thread_atoms_search(&sched->atom_root, thread, &sched->cmp_pid);
1135 u64 timestamp = sample->time;
1136 int cpu = sample->cpu, err = -1;
1141 BUG_ON(cpu >= MAX_CPUS || cpu < 0);
1143 if (thread_atoms_insert(sched, thread))
1145 atoms = thread_atoms_search(&sched->atom_root, thread, &sched->cmp_pid);
1147 pr_err("in-event: Internal tree error");
1150 if (add_sched_out_event(atoms, 'R', timestamp))
1154 add_runtime_event(atoms, runtime, timestamp);
1157 thread__put(thread);
1161 static int latency_wakeup_event(struct perf_sched *sched,
1162 struct perf_evsel *evsel,
1163 struct perf_sample *sample,
1164 struct machine *machine)
1166 const u32 pid = perf_evsel__intval(evsel, sample, "pid");
1167 struct work_atoms *atoms;
1168 struct work_atom *atom;
1169 struct thread *wakee;
1170 u64 timestamp = sample->time;
1173 wakee = machine__findnew_thread(machine, -1, pid);
1176 atoms = thread_atoms_search(&sched->atom_root, wakee, &sched->cmp_pid);
1178 if (thread_atoms_insert(sched, wakee))
1180 atoms = thread_atoms_search(&sched->atom_root, wakee, &sched->cmp_pid);
1182 pr_err("wakeup-event: Internal tree error");
1185 if (add_sched_out_event(atoms, 'S', timestamp))
1189 BUG_ON(list_empty(&atoms->work_list));
1191 atom = list_entry(atoms->work_list.prev, struct work_atom, list);
1194 * As we do not guarantee the wakeup event happens when
1195 * task is out of run queue, also may happen when task is
1196 * on run queue and wakeup only change ->state to TASK_RUNNING,
1197 * then we should not set the ->wake_up_time when wake up a
1198 * task which is on run queue.
1200 * You WILL be missing events if you've recorded only
1201 * one CPU, or are only looking at only one, so don't
1202 * skip in this case.
1204 if (sched->profile_cpu == -1 && atom->state != THREAD_SLEEPING)
1207 sched->nr_timestamps++;
1208 if (atom->sched_out_time > timestamp) {
1209 sched->nr_unordered_timestamps++;
1213 atom->state = THREAD_WAIT_CPU;
1214 atom->wake_up_time = timestamp;
1222 static int latency_migrate_task_event(struct perf_sched *sched,
1223 struct perf_evsel *evsel,
1224 struct perf_sample *sample,
1225 struct machine *machine)
1227 const u32 pid = perf_evsel__intval(evsel, sample, "pid");
1228 u64 timestamp = sample->time;
1229 struct work_atoms *atoms;
1230 struct work_atom *atom;
1231 struct thread *migrant;
1235 * Only need to worry about migration when profiling one CPU.
1237 if (sched->profile_cpu == -1)
1240 migrant = machine__findnew_thread(machine, -1, pid);
1241 if (migrant == NULL)
1243 atoms = thread_atoms_search(&sched->atom_root, migrant, &sched->cmp_pid);
1245 if (thread_atoms_insert(sched, migrant))
1247 register_pid(sched, migrant->tid, thread__comm_str(migrant));
1248 atoms = thread_atoms_search(&sched->atom_root, migrant, &sched->cmp_pid);
1250 pr_err("migration-event: Internal tree error");
1253 if (add_sched_out_event(atoms, 'R', timestamp))
1257 BUG_ON(list_empty(&atoms->work_list));
1259 atom = list_entry(atoms->work_list.prev, struct work_atom, list);
1260 atom->sched_in_time = atom->sched_out_time = atom->wake_up_time = timestamp;
1262 sched->nr_timestamps++;
1264 if (atom->sched_out_time > timestamp)
1265 sched->nr_unordered_timestamps++;
1268 thread__put(migrant);
1272 static void output_lat_thread(struct perf_sched *sched, struct work_atoms *work_list)
1277 char max_lat_at[32];
1279 if (!work_list->nb_atoms)
1282 * Ignore idle threads:
1284 if (!strcmp(thread__comm_str(work_list->thread), "swapper"))
1287 sched->all_runtime += work_list->total_runtime;
1288 sched->all_count += work_list->nb_atoms;
1290 if (work_list->num_merged > 1)
1291 ret = printf(" %s:(%d) ", thread__comm_str(work_list->thread), work_list->num_merged);
1293 ret = printf(" %s:%d ", thread__comm_str(work_list->thread), work_list->thread->tid);
1295 for (i = 0; i < 24 - ret; i++)
1298 avg = work_list->total_lat / work_list->nb_atoms;
1299 timestamp__scnprintf_usec(work_list->max_lat_at, max_lat_at, sizeof(max_lat_at));
1301 printf("|%11.3f ms |%9" PRIu64 " | avg:%9.3f ms | max:%9.3f ms | max at: %13s s\n",
1302 (double)work_list->total_runtime / NSEC_PER_MSEC,
1303 work_list->nb_atoms, (double)avg / NSEC_PER_MSEC,
1304 (double)work_list->max_lat / NSEC_PER_MSEC,
1308 static int pid_cmp(struct work_atoms *l, struct work_atoms *r)
1310 if (l->thread == r->thread)
1312 if (l->thread->tid < r->thread->tid)
1314 if (l->thread->tid > r->thread->tid)
1316 return (int)(l->thread - r->thread);
1319 static int avg_cmp(struct work_atoms *l, struct work_atoms *r)
1329 avgl = l->total_lat / l->nb_atoms;
1330 avgr = r->total_lat / r->nb_atoms;
1340 static int max_cmp(struct work_atoms *l, struct work_atoms *r)
1342 if (l->max_lat < r->max_lat)
1344 if (l->max_lat > r->max_lat)
1350 static int switch_cmp(struct work_atoms *l, struct work_atoms *r)
1352 if (l->nb_atoms < r->nb_atoms)
1354 if (l->nb_atoms > r->nb_atoms)
1360 static int runtime_cmp(struct work_atoms *l, struct work_atoms *r)
1362 if (l->total_runtime < r->total_runtime)
1364 if (l->total_runtime > r->total_runtime)
1370 static int sort_dimension__add(const char *tok, struct list_head *list)
1373 static struct sort_dimension avg_sort_dimension = {
1377 static struct sort_dimension max_sort_dimension = {
1381 static struct sort_dimension pid_sort_dimension = {
1385 static struct sort_dimension runtime_sort_dimension = {
1389 static struct sort_dimension switch_sort_dimension = {
1393 struct sort_dimension *available_sorts[] = {
1394 &pid_sort_dimension,
1395 &avg_sort_dimension,
1396 &max_sort_dimension,
1397 &switch_sort_dimension,
1398 &runtime_sort_dimension,
1401 for (i = 0; i < ARRAY_SIZE(available_sorts); i++) {
1402 if (!strcmp(available_sorts[i]->name, tok)) {
1403 list_add_tail(&available_sorts[i]->list, list);
1412 static void perf_sched__sort_lat(struct perf_sched *sched)
1414 struct rb_node *node;
1415 struct rb_root *root = &sched->atom_root;
1418 struct work_atoms *data;
1419 node = rb_first(root);
1423 rb_erase(node, root);
1424 data = rb_entry(node, struct work_atoms, node);
1425 __thread_latency_insert(&sched->sorted_atom_root, data, &sched->sort_list);
1427 if (root == &sched->atom_root) {
1428 root = &sched->merged_atom_root;
1433 static int process_sched_wakeup_event(struct perf_tool *tool,
1434 struct perf_evsel *evsel,
1435 struct perf_sample *sample,
1436 struct machine *machine)
1438 struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
1440 if (sched->tp_handler->wakeup_event)
1441 return sched->tp_handler->wakeup_event(sched, evsel, sample, machine);
1451 static bool thread__has_color(struct thread *thread)
1453 union map_priv priv = {
1454 .ptr = thread__priv(thread),
1460 static struct thread*
1461 map__findnew_thread(struct perf_sched *sched, struct machine *machine, pid_t pid, pid_t tid)
1463 struct thread *thread = machine__findnew_thread(machine, pid, tid);
1464 union map_priv priv = {
1468 if (!sched->map.color_pids || !thread || thread__priv(thread))
1471 if (thread_map__has(sched->map.color_pids, tid))
1474 thread__set_priv(thread, priv.ptr);
1478 static int map_switch_event(struct perf_sched *sched, struct perf_evsel *evsel,
1479 struct perf_sample *sample, struct machine *machine)
1481 const u32 next_pid = perf_evsel__intval(evsel, sample, "next_pid");
1482 struct thread *sched_in;
1484 u64 timestamp0, timestamp = sample->time;
1486 int i, this_cpu = sample->cpu;
1488 bool new_cpu = false;
1489 const char *color = PERF_COLOR_NORMAL;
1490 char stimestamp[32];
1492 BUG_ON(this_cpu >= MAX_CPUS || this_cpu < 0);
1494 if (this_cpu > sched->max_cpu)
1495 sched->max_cpu = this_cpu;
1497 if (sched->map.comp) {
1498 cpus_nr = bitmap_weight(sched->map.comp_cpus_mask, MAX_CPUS);
1499 if (!test_and_set_bit(this_cpu, sched->map.comp_cpus_mask)) {
1500 sched->map.comp_cpus[cpus_nr++] = this_cpu;
1504 cpus_nr = sched->max_cpu;
1506 timestamp0 = sched->cpu_last_switched[this_cpu];
1507 sched->cpu_last_switched[this_cpu] = timestamp;
1509 delta = timestamp - timestamp0;
1514 pr_err("hm, delta: %" PRIu64 " < 0 ?\n", delta);
1518 sched_in = map__findnew_thread(sched, machine, -1, next_pid);
1519 if (sched_in == NULL)
1522 sched->curr_thread[this_cpu] = thread__get(sched_in);
1527 if (!sched_in->shortname[0]) {
1528 if (!strcmp(thread__comm_str(sched_in), "swapper")) {
1530 * Don't allocate a letter-number for swapper:0
1531 * as a shortname. Instead, we use '.' for it.
1533 sched_in->shortname[0] = '.';
1534 sched_in->shortname[1] = ' ';
1536 sched_in->shortname[0] = sched->next_shortname1;
1537 sched_in->shortname[1] = sched->next_shortname2;
1539 if (sched->next_shortname1 < 'Z') {
1540 sched->next_shortname1++;
1542 sched->next_shortname1 = 'A';
1543 if (sched->next_shortname2 < '9')
1544 sched->next_shortname2++;
1546 sched->next_shortname2 = '0';
1552 for (i = 0; i < cpus_nr; i++) {
1553 int cpu = sched->map.comp ? sched->map.comp_cpus[i] : i;
1554 struct thread *curr_thread = sched->curr_thread[cpu];
1555 const char *pid_color = color;
1556 const char *cpu_color = color;
1558 if (curr_thread && thread__has_color(curr_thread))
1559 pid_color = COLOR_PIDS;
1561 if (sched->map.cpus && !cpu_map__has(sched->map.cpus, cpu))
1564 if (sched->map.color_cpus && cpu_map__has(sched->map.color_cpus, cpu))
1565 cpu_color = COLOR_CPUS;
1567 if (cpu != this_cpu)
1568 color_fprintf(stdout, color, " ");
1570 color_fprintf(stdout, cpu_color, "*");
1572 if (sched->curr_thread[cpu])
1573 color_fprintf(stdout, pid_color, "%2s ", sched->curr_thread[cpu]->shortname);
1575 color_fprintf(stdout, color, " ");
1578 if (sched->map.cpus && !cpu_map__has(sched->map.cpus, this_cpu))
1581 timestamp__scnprintf_usec(timestamp, stimestamp, sizeof(stimestamp));
1582 color_fprintf(stdout, color, " %12s secs ", stimestamp);
1583 if (new_shortname || (verbose > 0 && sched_in->tid)) {
1584 const char *pid_color = color;
1586 if (thread__has_color(sched_in))
1587 pid_color = COLOR_PIDS;
1589 color_fprintf(stdout, pid_color, "%s => %s:%d",
1590 sched_in->shortname, thread__comm_str(sched_in), sched_in->tid);
1593 if (sched->map.comp && new_cpu)
1594 color_fprintf(stdout, color, " (CPU %d)", this_cpu);
1597 color_fprintf(stdout, color, "\n");
1599 thread__put(sched_in);
1604 static int process_sched_switch_event(struct perf_tool *tool,
1605 struct perf_evsel *evsel,
1606 struct perf_sample *sample,
1607 struct machine *machine)
1609 struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
1610 int this_cpu = sample->cpu, err = 0;
1611 u32 prev_pid = perf_evsel__intval(evsel, sample, "prev_pid"),
1612 next_pid = perf_evsel__intval(evsel, sample, "next_pid");
1614 if (sched->curr_pid[this_cpu] != (u32)-1) {
1616 * Are we trying to switch away a PID that is
1619 if (sched->curr_pid[this_cpu] != prev_pid)
1620 sched->nr_context_switch_bugs++;
1623 if (sched->tp_handler->switch_event)
1624 err = sched->tp_handler->switch_event(sched, evsel, sample, machine);
1626 sched->curr_pid[this_cpu] = next_pid;
1630 static int process_sched_runtime_event(struct perf_tool *tool,
1631 struct perf_evsel *evsel,
1632 struct perf_sample *sample,
1633 struct machine *machine)
1635 struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
1637 if (sched->tp_handler->runtime_event)
1638 return sched->tp_handler->runtime_event(sched, evsel, sample, machine);
1643 static int perf_sched__process_fork_event(struct perf_tool *tool,
1644 union perf_event *event,
1645 struct perf_sample *sample,
1646 struct machine *machine)
1648 struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
1650 /* run the fork event through the perf machineruy */
1651 perf_event__process_fork(tool, event, sample, machine);
1653 /* and then run additional processing needed for this command */
1654 if (sched->tp_handler->fork_event)
1655 return sched->tp_handler->fork_event(sched, event, machine);
1660 static int process_sched_migrate_task_event(struct perf_tool *tool,
1661 struct perf_evsel *evsel,
1662 struct perf_sample *sample,
1663 struct machine *machine)
1665 struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
1667 if (sched->tp_handler->migrate_task_event)
1668 return sched->tp_handler->migrate_task_event(sched, evsel, sample, machine);
1673 typedef int (*tracepoint_handler)(struct perf_tool *tool,
1674 struct perf_evsel *evsel,
1675 struct perf_sample *sample,
1676 struct machine *machine);
1678 static int perf_sched__process_tracepoint_sample(struct perf_tool *tool __maybe_unused,
1679 union perf_event *event __maybe_unused,
1680 struct perf_sample *sample,
1681 struct perf_evsel *evsel,
1682 struct machine *machine)
1686 if (evsel->handler != NULL) {
1687 tracepoint_handler f = evsel->handler;
1688 err = f(tool, evsel, sample, machine);
1694 static int perf_sched__read_events(struct perf_sched *sched)
1696 const struct perf_evsel_str_handler handlers[] = {
1697 { "sched:sched_switch", process_sched_switch_event, },
1698 { "sched:sched_stat_runtime", process_sched_runtime_event, },
1699 { "sched:sched_wakeup", process_sched_wakeup_event, },
1700 { "sched:sched_wakeup_new", process_sched_wakeup_event, },
1701 { "sched:sched_migrate_task", process_sched_migrate_task_event, },
1703 struct perf_session *session;
1704 struct perf_data_file file = {
1706 .mode = PERF_DATA_MODE_READ,
1707 .force = sched->force,
1711 session = perf_session__new(&file, false, &sched->tool);
1712 if (session == NULL) {
1713 pr_debug("No Memory for session\n");
1717 symbol__init(&session->header.env);
1719 if (perf_session__set_tracepoints_handlers(session, handlers))
1722 if (perf_session__has_traces(session, "record -R")) {
1723 int err = perf_session__process_events(session);
1725 pr_err("Failed to process events, error %d", err);
1729 sched->nr_events = session->evlist->stats.nr_events[0];
1730 sched->nr_lost_events = session->evlist->stats.total_lost;
1731 sched->nr_lost_chunks = session->evlist->stats.nr_events[PERF_RECORD_LOST];
1736 perf_session__delete(session);
1741 * scheduling times are printed as msec.usec
1743 static inline void print_sched_time(unsigned long long nsecs, int width)
1745 unsigned long msecs;
1746 unsigned long usecs;
1748 msecs = nsecs / NSEC_PER_MSEC;
1749 nsecs -= msecs * NSEC_PER_MSEC;
1750 usecs = nsecs / NSEC_PER_USEC;
1751 printf("%*lu.%03lu ", width, msecs, usecs);
1755 * returns runtime data for event, allocating memory for it the
1756 * first time it is used.
1758 static struct evsel_runtime *perf_evsel__get_runtime(struct perf_evsel *evsel)
1760 struct evsel_runtime *r = evsel->priv;
1763 r = zalloc(sizeof(struct evsel_runtime));
1771 * save last time event was seen per cpu
1773 static void perf_evsel__save_time(struct perf_evsel *evsel,
1774 u64 timestamp, u32 cpu)
1776 struct evsel_runtime *r = perf_evsel__get_runtime(evsel);
1781 if ((cpu >= r->ncpu) || (r->last_time == NULL)) {
1782 int i, n = __roundup_pow_of_two(cpu+1);
1783 void *p = r->last_time;
1785 p = realloc(r->last_time, n * sizeof(u64));
1790 for (i = r->ncpu; i < n; ++i)
1791 r->last_time[i] = (u64) 0;
1796 r->last_time[cpu] = timestamp;
1799 /* returns last time this event was seen on the given cpu */
1800 static u64 perf_evsel__get_time(struct perf_evsel *evsel, u32 cpu)
1802 struct evsel_runtime *r = perf_evsel__get_runtime(evsel);
1804 if ((r == NULL) || (r->last_time == NULL) || (cpu >= r->ncpu))
1807 return r->last_time[cpu];
1810 static int comm_width = 30;
1812 static char *timehist_get_commstr(struct thread *thread)
1814 static char str[32];
1815 const char *comm = thread__comm_str(thread);
1816 pid_t tid = thread->tid;
1817 pid_t pid = thread->pid_;
1821 n = scnprintf(str, sizeof(str), "%s", comm);
1823 else if (tid != pid)
1824 n = scnprintf(str, sizeof(str), "%s[%d/%d]", comm, tid, pid);
1827 n = scnprintf(str, sizeof(str), "%s[%d]", comm, tid);
1835 static void timehist_header(struct perf_sched *sched)
1837 u32 ncpus = sched->max_cpu + 1;
1840 printf("%15s %6s ", "time", "cpu");
1842 if (sched->show_cpu_visual) {
1844 for (i = 0, j = 0; i < ncpus; ++i) {
1852 printf(" %-*s %9s %9s %9s", comm_width,
1853 "task name", "wait time", "sch delay", "run time");
1855 if (sched->show_state)
1856 printf(" %s", "state");
1863 printf("%15s %-6s ", "", "");
1865 if (sched->show_cpu_visual)
1866 printf(" %*s ", ncpus, "");
1868 printf(" %-*s %9s %9s %9s", comm_width,
1869 "[tid/pid]", "(msec)", "(msec)", "(msec)");
1871 if (sched->show_state)
1879 printf("%.15s %.6s ", graph_dotted_line, graph_dotted_line);
1881 if (sched->show_cpu_visual)
1882 printf(" %.*s ", ncpus, graph_dotted_line);
1884 printf(" %.*s %.9s %.9s %.9s", comm_width,
1885 graph_dotted_line, graph_dotted_line, graph_dotted_line,
1888 if (sched->show_state)
1889 printf(" %.5s", graph_dotted_line);
1894 static char task_state_char(struct thread *thread, int state)
1896 static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
1897 unsigned bit = state ? ffs(state) : 0;
1900 if (thread->tid == 0)
1903 return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
1906 static void timehist_print_sample(struct perf_sched *sched,
1907 struct perf_evsel *evsel,
1908 struct perf_sample *sample,
1909 struct addr_location *al,
1910 struct thread *thread,
1913 struct thread_runtime *tr = thread__priv(thread);
1914 const char *next_comm = perf_evsel__strval(evsel, sample, "next_comm");
1915 const u32 next_pid = perf_evsel__intval(evsel, sample, "next_pid");
1916 u32 max_cpus = sched->max_cpu + 1;
1921 timestamp__scnprintf_usec(t, tstr, sizeof(tstr));
1922 printf("%15s [%04d] ", tstr, sample->cpu);
1924 if (sched->show_cpu_visual) {
1929 for (i = 0; i < max_cpus; ++i) {
1930 /* flag idle times with 'i'; others are sched events */
1931 if (i == sample->cpu)
1932 c = (thread->tid == 0) ? 'i' : 's';
1940 printf(" %-*s ", comm_width, timehist_get_commstr(thread));
1942 wait_time = tr->dt_sleep + tr->dt_iowait + tr->dt_preempt;
1943 print_sched_time(wait_time, 6);
1945 print_sched_time(tr->dt_delay, 6);
1946 print_sched_time(tr->dt_run, 6);
1948 if (sched->show_state)
1949 printf(" %5c ", task_state_char(thread, state));
1951 if (sched->show_next) {
1952 snprintf(nstr, sizeof(nstr), "next: %s[%d]", next_comm, next_pid);
1953 printf(" %-*s", comm_width, nstr);
1956 if (sched->show_wakeups && !sched->show_next)
1957 printf(" %-*s", comm_width, "");
1959 if (thread->tid == 0)
1962 if (sched->show_callchain)
1965 sample__fprintf_sym(sample, al, 0,
1966 EVSEL__PRINT_SYM | EVSEL__PRINT_ONELINE |
1967 EVSEL__PRINT_CALLCHAIN_ARROW |
1968 EVSEL__PRINT_SKIP_IGNORED,
1969 &callchain_cursor, stdout);
1976 * Explanation of delta-time stats:
1978 * t = time of current schedule out event
1979 * tprev = time of previous sched out event
1980 * also time of schedule-in event for current task
1981 * last_time = time of last sched change event for current task
1982 * (i.e, time process was last scheduled out)
1983 * ready_to_run = time of wakeup for current task
1985 * -----|------------|------------|------------|------
1986 * last ready tprev t
1989 * |-------- dt_wait --------|
1990 * |- dt_delay -|-- dt_run --|
1992 * dt_run = run time of current task
1993 * dt_wait = time between last schedule out event for task and tprev
1994 * represents time spent off the cpu
1995 * dt_delay = time between wakeup and schedule-in of task
1998 static void timehist_update_runtime_stats(struct thread_runtime *r,
2008 r->dt_run = t - tprev;
2009 if (r->ready_to_run) {
2010 if (r->ready_to_run > tprev)
2011 pr_debug("time travel: wakeup time for task > previous sched_switch event\n");
2013 r->dt_delay = tprev - r->ready_to_run;
2016 if (r->last_time > tprev)
2017 pr_debug("time travel: last sched out time for task > previous sched_switch event\n");
2018 else if (r->last_time) {
2019 u64 dt_wait = tprev - r->last_time;
2021 if (r->last_state == TASK_RUNNING)
2022 r->dt_preempt = dt_wait;
2023 else if (r->last_state == TASK_UNINTERRUPTIBLE)
2024 r->dt_iowait = dt_wait;
2026 r->dt_sleep = dt_wait;
2030 update_stats(&r->run_stats, r->dt_run);
2032 r->total_run_time += r->dt_run;
2033 r->total_delay_time += r->dt_delay;
2034 r->total_sleep_time += r->dt_sleep;
2035 r->total_iowait_time += r->dt_iowait;
2036 r->total_preempt_time += r->dt_preempt;
2039 static bool is_idle_sample(struct perf_sample *sample,
2040 struct perf_evsel *evsel)
2042 /* pid 0 == swapper == idle task */
2043 if (strcmp(perf_evsel__name(evsel), "sched:sched_switch") == 0)
2044 return perf_evsel__intval(evsel, sample, "prev_pid") == 0;
2046 return sample->pid == 0;
2049 static void save_task_callchain(struct perf_sched *sched,
2050 struct perf_sample *sample,
2051 struct perf_evsel *evsel,
2052 struct machine *machine)
2054 struct callchain_cursor *cursor = &callchain_cursor;
2055 struct thread *thread;
2057 /* want main thread for process - has maps */
2058 thread = machine__findnew_thread(machine, sample->pid, sample->pid);
2059 if (thread == NULL) {
2060 pr_debug("Failed to get thread for pid %d.\n", sample->pid);
2064 if (!symbol_conf.use_callchain || sample->callchain == NULL)
2067 if (thread__resolve_callchain(thread, cursor, evsel, sample,
2068 NULL, NULL, sched->max_stack + 2) != 0) {
2070 pr_err("Failed to resolve callchain. Skipping\n");
2075 callchain_cursor_commit(cursor);
2078 struct callchain_cursor_node *node;
2081 node = callchain_cursor_current(cursor);
2087 if (!strcmp(sym->name, "schedule") ||
2088 !strcmp(sym->name, "__schedule") ||
2089 !strcmp(sym->name, "preempt_schedule"))
2093 callchain_cursor_advance(cursor);
2097 static int init_idle_thread(struct thread *thread)
2099 struct idle_thread_runtime *itr;
2101 thread__set_comm(thread, idle_comm, 0);
2103 itr = zalloc(sizeof(*itr));
2107 init_stats(&itr->tr.run_stats);
2108 callchain_init(&itr->callchain);
2109 callchain_cursor_reset(&itr->cursor);
2110 thread__set_priv(thread, itr);
2116 * Track idle stats per cpu by maintaining a local thread
2117 * struct for the idle task on each cpu.
2119 static int init_idle_threads(int ncpu)
2123 idle_threads = zalloc(ncpu * sizeof(struct thread *));
2127 idle_max_cpu = ncpu;
2129 /* allocate the actual thread struct if needed */
2130 for (i = 0; i < ncpu; ++i) {
2131 idle_threads[i] = thread__new(0, 0);
2132 if (idle_threads[i] == NULL)
2135 ret = init_idle_thread(idle_threads[i]);
2143 static void free_idle_threads(void)
2147 if (idle_threads == NULL)
2150 for (i = 0; i < idle_max_cpu; ++i) {
2151 if ((idle_threads[i]))
2152 thread__delete(idle_threads[i]);
2158 static struct thread *get_idle_thread(int cpu)
2161 * expand/allocate array of pointers to local thread
2164 if ((cpu >= idle_max_cpu) || (idle_threads == NULL)) {
2165 int i, j = __roundup_pow_of_two(cpu+1);
2168 p = realloc(idle_threads, j * sizeof(struct thread *));
2172 idle_threads = (struct thread **) p;
2173 for (i = idle_max_cpu; i < j; ++i)
2174 idle_threads[i] = NULL;
2179 /* allocate a new thread struct if needed */
2180 if (idle_threads[cpu] == NULL) {
2181 idle_threads[cpu] = thread__new(0, 0);
2183 if (idle_threads[cpu]) {
2184 if (init_idle_thread(idle_threads[cpu]) < 0)
2189 return idle_threads[cpu];
2192 static void save_idle_callchain(struct idle_thread_runtime *itr,
2193 struct perf_sample *sample)
2195 if (!symbol_conf.use_callchain || sample->callchain == NULL)
2198 callchain_cursor__copy(&itr->cursor, &callchain_cursor);
2202 * handle runtime stats saved per thread
2204 static struct thread_runtime *thread__init_runtime(struct thread *thread)
2206 struct thread_runtime *r;
2208 r = zalloc(sizeof(struct thread_runtime));
2212 init_stats(&r->run_stats);
2213 thread__set_priv(thread, r);
2218 static struct thread_runtime *thread__get_runtime(struct thread *thread)
2220 struct thread_runtime *tr;
2222 tr = thread__priv(thread);
2224 tr = thread__init_runtime(thread);
2226 pr_debug("Failed to malloc memory for runtime data.\n");
2232 static struct thread *timehist_get_thread(struct perf_sched *sched,
2233 struct perf_sample *sample,
2234 struct machine *machine,
2235 struct perf_evsel *evsel)
2237 struct thread *thread;
2239 if (is_idle_sample(sample, evsel)) {
2240 thread = get_idle_thread(sample->cpu);
2242 pr_err("Failed to get idle thread for cpu %d.\n", sample->cpu);
2245 /* there were samples with tid 0 but non-zero pid */
2246 thread = machine__findnew_thread(machine, sample->pid,
2247 sample->tid ?: sample->pid);
2248 if (thread == NULL) {
2249 pr_debug("Failed to get thread for tid %d. skipping sample.\n",
2253 save_task_callchain(sched, sample, evsel, machine);
2254 if (sched->idle_hist) {
2255 struct thread *idle;
2256 struct idle_thread_runtime *itr;
2258 idle = get_idle_thread(sample->cpu);
2260 pr_err("Failed to get idle thread for cpu %d.\n", sample->cpu);
2264 itr = thread__priv(idle);
2268 itr->last_thread = thread;
2270 /* copy task callchain when entering to idle */
2271 if (perf_evsel__intval(evsel, sample, "next_pid") == 0)
2272 save_idle_callchain(itr, sample);
2279 static bool timehist_skip_sample(struct perf_sched *sched,
2280 struct thread *thread,
2281 struct perf_evsel *evsel,
2282 struct perf_sample *sample)
2286 if (thread__is_filtered(thread)) {
2288 sched->skipped_samples++;
2291 if (sched->idle_hist) {
2292 if (strcmp(perf_evsel__name(evsel), "sched:sched_switch"))
2294 else if (perf_evsel__intval(evsel, sample, "prev_pid") != 0 &&
2295 perf_evsel__intval(evsel, sample, "next_pid") != 0)
2302 static void timehist_print_wakeup_event(struct perf_sched *sched,
2303 struct perf_evsel *evsel,
2304 struct perf_sample *sample,
2305 struct machine *machine,
2306 struct thread *awakened)
2308 struct thread *thread;
2311 thread = machine__findnew_thread(machine, sample->pid, sample->tid);
2315 /* show wakeup unless both awakee and awaker are filtered */
2316 if (timehist_skip_sample(sched, thread, evsel, sample) &&
2317 timehist_skip_sample(sched, awakened, evsel, sample)) {
2321 timestamp__scnprintf_usec(sample->time, tstr, sizeof(tstr));
2322 printf("%15s [%04d] ", tstr, sample->cpu);
2323 if (sched->show_cpu_visual)
2324 printf(" %*s ", sched->max_cpu + 1, "");
2326 printf(" %-*s ", comm_width, timehist_get_commstr(thread));
2329 printf(" %9s %9s %9s ", "", "", "");
2331 printf("awakened: %s", timehist_get_commstr(awakened));
2336 static int timehist_sched_wakeup_event(struct perf_tool *tool,
2337 union perf_event *event __maybe_unused,
2338 struct perf_evsel *evsel,
2339 struct perf_sample *sample,
2340 struct machine *machine)
2342 struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
2343 struct thread *thread;
2344 struct thread_runtime *tr = NULL;
2345 /* want pid of awakened task not pid in sample */
2346 const u32 pid = perf_evsel__intval(evsel, sample, "pid");
2348 thread = machine__findnew_thread(machine, 0, pid);
2352 tr = thread__get_runtime(thread);
2356 if (tr->ready_to_run == 0)
2357 tr->ready_to_run = sample->time;
2359 /* show wakeups if requested */
2360 if (sched->show_wakeups &&
2361 !perf_time__skip_sample(&sched->ptime, sample->time))
2362 timehist_print_wakeup_event(sched, evsel, sample, machine, thread);
2367 static void timehist_print_migration_event(struct perf_sched *sched,
2368 struct perf_evsel *evsel,
2369 struct perf_sample *sample,
2370 struct machine *machine,
2371 struct thread *migrated)
2373 struct thread *thread;
2375 u32 max_cpus = sched->max_cpu + 1;
2378 if (sched->summary_only)
2381 max_cpus = sched->max_cpu + 1;
2382 ocpu = perf_evsel__intval(evsel, sample, "orig_cpu");
2383 dcpu = perf_evsel__intval(evsel, sample, "dest_cpu");
2385 thread = machine__findnew_thread(machine, sample->pid, sample->tid);
2389 if (timehist_skip_sample(sched, thread, evsel, sample) &&
2390 timehist_skip_sample(sched, migrated, evsel, sample)) {
2394 timestamp__scnprintf_usec(sample->time, tstr, sizeof(tstr));
2395 printf("%15s [%04d] ", tstr, sample->cpu);
2397 if (sched->show_cpu_visual) {
2402 for (i = 0; i < max_cpus; ++i) {
2403 c = (i == sample->cpu) ? 'm' : ' ';
2409 printf(" %-*s ", comm_width, timehist_get_commstr(thread));
2412 printf(" %9s %9s %9s ", "", "", "");
2414 printf("migrated: %s", timehist_get_commstr(migrated));
2415 printf(" cpu %d => %d", ocpu, dcpu);
2420 static int timehist_migrate_task_event(struct perf_tool *tool,
2421 union perf_event *event __maybe_unused,
2422 struct perf_evsel *evsel,
2423 struct perf_sample *sample,
2424 struct machine *machine)
2426 struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
2427 struct thread *thread;
2428 struct thread_runtime *tr = NULL;
2429 /* want pid of migrated task not pid in sample */
2430 const u32 pid = perf_evsel__intval(evsel, sample, "pid");
2432 thread = machine__findnew_thread(machine, 0, pid);
2436 tr = thread__get_runtime(thread);
2442 /* show migrations if requested */
2443 timehist_print_migration_event(sched, evsel, sample, machine, thread);
2448 static int timehist_sched_change_event(struct perf_tool *tool,
2449 union perf_event *event,
2450 struct perf_evsel *evsel,
2451 struct perf_sample *sample,
2452 struct machine *machine)
2454 struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
2455 struct perf_time_interval *ptime = &sched->ptime;
2456 struct addr_location al;
2457 struct thread *thread;
2458 struct thread_runtime *tr = NULL;
2459 u64 tprev, t = sample->time;
2461 int state = perf_evsel__intval(evsel, sample, "prev_state");
2464 if (machine__resolve(machine, &al, sample) < 0) {
2465 pr_err("problem processing %d event. skipping it\n",
2466 event->header.type);
2471 thread = timehist_get_thread(sched, sample, machine, evsel);
2472 if (thread == NULL) {
2477 if (timehist_skip_sample(sched, thread, evsel, sample))
2480 tr = thread__get_runtime(thread);
2486 tprev = perf_evsel__get_time(evsel, sample->cpu);
2489 * If start time given:
2490 * - sample time is under window user cares about - skip sample
2491 * - tprev is under window user cares about - reset to start of window
2493 if (ptime->start && ptime->start > t)
2496 if (tprev && ptime->start > tprev)
2497 tprev = ptime->start;
2500 * If end time given:
2501 * - previous sched event is out of window - we are done
2502 * - sample time is beyond window user cares about - reset it
2503 * to close out stats for time window interest
2506 if (tprev > ptime->end)
2513 if (!sched->idle_hist || thread->tid == 0) {
2514 timehist_update_runtime_stats(tr, t, tprev);
2516 if (sched->idle_hist) {
2517 struct idle_thread_runtime *itr = (void *)tr;
2518 struct thread_runtime *last_tr;
2520 BUG_ON(thread->tid != 0);
2522 if (itr->last_thread == NULL)
2525 /* add current idle time as last thread's runtime */
2526 last_tr = thread__get_runtime(itr->last_thread);
2527 if (last_tr == NULL)
2530 timehist_update_runtime_stats(last_tr, t, tprev);
2532 * remove delta time of last thread as it's not updated
2533 * and otherwise it will show an invalid value next
2534 * time. we only care total run time and run stat.
2536 last_tr->dt_run = 0;
2537 last_tr->dt_delay = 0;
2538 last_tr->dt_sleep = 0;
2539 last_tr->dt_iowait = 0;
2540 last_tr->dt_preempt = 0;
2543 callchain_append(&itr->callchain, &itr->cursor, t - tprev);
2545 itr->last_thread = NULL;
2549 if (!sched->summary_only)
2550 timehist_print_sample(sched, evsel, sample, &al, thread, t, state);
2553 if (sched->hist_time.start == 0 && t >= ptime->start)
2554 sched->hist_time.start = t;
2555 if (ptime->end == 0 || t <= ptime->end)
2556 sched->hist_time.end = t;
2559 /* time of this sched_switch event becomes last time task seen */
2560 tr->last_time = sample->time;
2562 /* last state is used to determine where to account wait time */
2563 tr->last_state = state;
2565 /* sched out event for task so reset ready to run time */
2566 tr->ready_to_run = 0;
2569 perf_evsel__save_time(evsel, sample->time, sample->cpu);
2574 static int timehist_sched_switch_event(struct perf_tool *tool,
2575 union perf_event *event,
2576 struct perf_evsel *evsel,
2577 struct perf_sample *sample,
2578 struct machine *machine __maybe_unused)
2580 return timehist_sched_change_event(tool, event, evsel, sample, machine);
2583 static int process_lost(struct perf_tool *tool __maybe_unused,
2584 union perf_event *event,
2585 struct perf_sample *sample,
2586 struct machine *machine __maybe_unused)
2590 timestamp__scnprintf_usec(sample->time, tstr, sizeof(tstr));
2591 printf("%15s ", tstr);
2592 printf("lost %" PRIu64 " events on cpu %d\n", event->lost.lost, sample->cpu);
2598 static void print_thread_runtime(struct thread *t,
2599 struct thread_runtime *r)
2601 double mean = avg_stats(&r->run_stats);
2604 printf("%*s %5d %9" PRIu64 " ",
2605 comm_width, timehist_get_commstr(t), t->ppid,
2606 (u64) r->run_stats.n);
2608 print_sched_time(r->total_run_time, 8);
2609 stddev = rel_stddev_stats(stddev_stats(&r->run_stats), mean);
2610 print_sched_time(r->run_stats.min, 6);
2612 print_sched_time((u64) mean, 6);
2614 print_sched_time(r->run_stats.max, 6);
2616 printf("%5.2f", stddev);
2617 printf(" %5" PRIu64, r->migrations);
2621 static void print_thread_waittime(struct thread *t,
2622 struct thread_runtime *r)
2624 printf("%*s %5d %9" PRIu64 " ",
2625 comm_width, timehist_get_commstr(t), t->ppid,
2626 (u64) r->run_stats.n);
2628 print_sched_time(r->total_run_time, 8);
2629 print_sched_time(r->total_sleep_time, 6);
2631 print_sched_time(r->total_iowait_time, 6);
2633 print_sched_time(r->total_preempt_time, 6);
2635 print_sched_time(r->total_delay_time, 6);
2639 struct total_run_stats {
2640 struct perf_sched *sched;
2646 static int __show_thread_runtime(struct thread *t, void *priv)
2648 struct total_run_stats *stats = priv;
2649 struct thread_runtime *r;
2651 if (thread__is_filtered(t))
2654 r = thread__priv(t);
2655 if (r && r->run_stats.n) {
2656 stats->task_count++;
2657 stats->sched_count += r->run_stats.n;
2658 stats->total_run_time += r->total_run_time;
2660 if (stats->sched->show_state)
2661 print_thread_waittime(t, r);
2663 print_thread_runtime(t, r);
2669 static int show_thread_runtime(struct thread *t, void *priv)
2674 return __show_thread_runtime(t, priv);
2677 static int show_deadthread_runtime(struct thread *t, void *priv)
2682 return __show_thread_runtime(t, priv);
2685 static size_t callchain__fprintf_folded(FILE *fp, struct callchain_node *node)
2687 const char *sep = " <- ";
2688 struct callchain_list *chain;
2696 ret = callchain__fprintf_folded(fp, node->parent);
2699 list_for_each_entry(chain, &node->val, list) {
2700 if (chain->ip >= PERF_CONTEXT_MAX)
2702 if (chain->ms.sym && chain->ms.sym->ignore)
2704 ret += fprintf(fp, "%s%s", first ? "" : sep,
2705 callchain_list__sym_name(chain, bf, sizeof(bf),
2713 static size_t timehist_print_idlehist_callchain(struct rb_root *root)
2717 struct callchain_node *chain;
2718 struct rb_node *rb_node = rb_first(root);
2720 printf(" %16s %8s %s\n", "Idle time (msec)", "Count", "Callchains");
2721 printf(" %.16s %.8s %.50s\n", graph_dotted_line, graph_dotted_line,
2725 chain = rb_entry(rb_node, struct callchain_node, rb_node);
2726 rb_node = rb_next(rb_node);
2728 ret += fprintf(fp, " ");
2729 print_sched_time(chain->hit, 12);
2730 ret += 16; /* print_sched_time returns 2nd arg + 4 */
2731 ret += fprintf(fp, " %8d ", chain->count);
2732 ret += callchain__fprintf_folded(fp, chain);
2733 ret += fprintf(fp, "\n");
2739 static void timehist_print_summary(struct perf_sched *sched,
2740 struct perf_session *session)
2742 struct machine *m = &session->machines.host;
2743 struct total_run_stats totals;
2746 struct thread_runtime *r;
2748 u64 hist_time = sched->hist_time.end - sched->hist_time.start;
2750 memset(&totals, 0, sizeof(totals));
2751 totals.sched = sched;
2753 if (sched->idle_hist) {
2754 printf("\nIdle-time summary\n");
2755 printf("%*s parent sched-out ", comm_width, "comm");
2756 printf(" idle-time min-idle avg-idle max-idle stddev migrations\n");
2757 } else if (sched->show_state) {
2758 printf("\nWait-time summary\n");
2759 printf("%*s parent sched-in ", comm_width, "comm");
2760 printf(" run-time sleep iowait preempt delay\n");
2762 printf("\nRuntime summary\n");
2763 printf("%*s parent sched-in ", comm_width, "comm");
2764 printf(" run-time min-run avg-run max-run stddev migrations\n");
2766 printf("%*s (count) ", comm_width, "");
2767 printf(" (msec) (msec) (msec) (msec) %s\n",
2768 sched->show_state ? "(msec)" : "%");
2769 printf("%.117s\n", graph_dotted_line);
2771 machine__for_each_thread(m, show_thread_runtime, &totals);
2772 task_count = totals.task_count;
2774 printf("<no still running tasks>\n");
2776 printf("\nTerminated tasks:\n");
2777 machine__for_each_thread(m, show_deadthread_runtime, &totals);
2778 if (task_count == totals.task_count)
2779 printf("<no terminated tasks>\n");
2781 /* CPU idle stats not tracked when samples were skipped */
2782 if (sched->skipped_samples && !sched->idle_hist)
2785 printf("\nIdle stats:\n");
2786 for (i = 0; i < idle_max_cpu; ++i) {
2787 t = idle_threads[i];
2791 r = thread__priv(t);
2792 if (r && r->run_stats.n) {
2793 totals.sched_count += r->run_stats.n;
2794 printf(" CPU %2d idle for ", i);
2795 print_sched_time(r->total_run_time, 6);
2796 printf(" msec (%6.2f%%)\n", 100.0 * r->total_run_time / hist_time);
2798 printf(" CPU %2d idle entire time window\n", i);
2801 if (sched->idle_hist && symbol_conf.use_callchain) {
2802 callchain_param.mode = CHAIN_FOLDED;
2803 callchain_param.value = CCVAL_PERIOD;
2805 callchain_register_param(&callchain_param);
2807 printf("\nIdle stats by callchain:\n");
2808 for (i = 0; i < idle_max_cpu; ++i) {
2809 struct idle_thread_runtime *itr;
2811 t = idle_threads[i];
2815 itr = thread__priv(t);
2819 callchain_param.sort(&itr->sorted_root, &itr->callchain,
2820 0, &callchain_param);
2822 printf(" CPU %2d:", i);
2823 print_sched_time(itr->tr.total_run_time, 6);
2825 timehist_print_idlehist_callchain(&itr->sorted_root);
2831 " Total number of unique tasks: %" PRIu64 "\n"
2832 "Total number of context switches: %" PRIu64 "\n",
2833 totals.task_count, totals.sched_count);
2835 printf(" Total run time (msec): ");
2836 print_sched_time(totals.total_run_time, 2);
2839 printf(" Total scheduling time (msec): ");
2840 print_sched_time(hist_time, 2);
2841 printf(" (x %d)\n", sched->max_cpu);
2844 typedef int (*sched_handler)(struct perf_tool *tool,
2845 union perf_event *event,
2846 struct perf_evsel *evsel,
2847 struct perf_sample *sample,
2848 struct machine *machine);
2850 static int perf_timehist__process_sample(struct perf_tool *tool,
2851 union perf_event *event,
2852 struct perf_sample *sample,
2853 struct perf_evsel *evsel,
2854 struct machine *machine)
2856 struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
2858 int this_cpu = sample->cpu;
2860 if (this_cpu > sched->max_cpu)
2861 sched->max_cpu = this_cpu;
2863 if (evsel->handler != NULL) {
2864 sched_handler f = evsel->handler;
2866 err = f(tool, event, evsel, sample, machine);
2872 static int timehist_check_attr(struct perf_sched *sched,
2873 struct perf_evlist *evlist)
2875 struct perf_evsel *evsel;
2876 struct evsel_runtime *er;
2878 list_for_each_entry(evsel, &evlist->entries, node) {
2879 er = perf_evsel__get_runtime(evsel);
2881 pr_err("Failed to allocate memory for evsel runtime data\n");
2885 if (sched->show_callchain &&
2886 !(evsel->attr.sample_type & PERF_SAMPLE_CALLCHAIN)) {
2887 pr_info("Samples do not have callchains.\n");
2888 sched->show_callchain = 0;
2889 symbol_conf.use_callchain = 0;
2896 static int perf_sched__timehist(struct perf_sched *sched)
2898 const struct perf_evsel_str_handler handlers[] = {
2899 { "sched:sched_switch", timehist_sched_switch_event, },
2900 { "sched:sched_wakeup", timehist_sched_wakeup_event, },
2901 { "sched:sched_wakeup_new", timehist_sched_wakeup_event, },
2903 const struct perf_evsel_str_handler migrate_handlers[] = {
2904 { "sched:sched_migrate_task", timehist_migrate_task_event, },
2906 struct perf_data_file file = {
2908 .mode = PERF_DATA_MODE_READ,
2909 .force = sched->force,
2912 struct perf_session *session;
2913 struct perf_evlist *evlist;
2917 * event handlers for timehist option
2919 sched->tool.sample = perf_timehist__process_sample;
2920 sched->tool.mmap = perf_event__process_mmap;
2921 sched->tool.comm = perf_event__process_comm;
2922 sched->tool.exit = perf_event__process_exit;
2923 sched->tool.fork = perf_event__process_fork;
2924 sched->tool.lost = process_lost;
2925 sched->tool.attr = perf_event__process_attr;
2926 sched->tool.tracing_data = perf_event__process_tracing_data;
2927 sched->tool.build_id = perf_event__process_build_id;
2929 sched->tool.ordered_events = true;
2930 sched->tool.ordering_requires_timestamps = true;
2932 symbol_conf.use_callchain = sched->show_callchain;
2934 session = perf_session__new(&file, false, &sched->tool);
2935 if (session == NULL)
2938 evlist = session->evlist;
2940 symbol__init(&session->header.env);
2942 if (perf_time__parse_str(&sched->ptime, sched->time_str) != 0) {
2943 pr_err("Invalid time string\n");
2947 if (timehist_check_attr(sched, evlist) != 0)
2952 /* setup per-evsel handlers */
2953 if (perf_session__set_tracepoints_handlers(session, handlers))
2956 /* sched_switch event at a minimum needs to exist */
2957 if (!perf_evlist__find_tracepoint_by_name(session->evlist,
2958 "sched:sched_switch")) {
2959 pr_err("No sched_switch events found. Have you run 'perf sched record'?\n");
2963 if (sched->show_migrations &&
2964 perf_session__set_tracepoints_handlers(session, migrate_handlers))
2967 /* pre-allocate struct for per-CPU idle stats */
2968 sched->max_cpu = session->header.env.nr_cpus_online;
2969 if (sched->max_cpu == 0)
2971 if (init_idle_threads(sched->max_cpu))
2974 /* summary_only implies summary option, but don't overwrite summary if set */
2975 if (sched->summary_only)
2976 sched->summary = sched->summary_only;
2978 if (!sched->summary_only)
2979 timehist_header(sched);
2981 err = perf_session__process_events(session);
2983 pr_err("Failed to process events, error %d", err);
2987 sched->nr_events = evlist->stats.nr_events[0];
2988 sched->nr_lost_events = evlist->stats.total_lost;
2989 sched->nr_lost_chunks = evlist->stats.nr_events[PERF_RECORD_LOST];
2992 timehist_print_summary(sched, session);
2995 free_idle_threads();
2996 perf_session__delete(session);
3002 static void print_bad_events(struct perf_sched *sched)
3004 if (sched->nr_unordered_timestamps && sched->nr_timestamps) {
3005 printf(" INFO: %.3f%% unordered timestamps (%ld out of %ld)\n",
3006 (double)sched->nr_unordered_timestamps/(double)sched->nr_timestamps*100.0,
3007 sched->nr_unordered_timestamps, sched->nr_timestamps);
3009 if (sched->nr_lost_events && sched->nr_events) {
3010 printf(" INFO: %.3f%% lost events (%ld out of %ld, in %ld chunks)\n",
3011 (double)sched->nr_lost_events/(double)sched->nr_events * 100.0,
3012 sched->nr_lost_events, sched->nr_events, sched->nr_lost_chunks);
3014 if (sched->nr_context_switch_bugs && sched->nr_timestamps) {
3015 printf(" INFO: %.3f%% context switch bugs (%ld out of %ld)",
3016 (double)sched->nr_context_switch_bugs/(double)sched->nr_timestamps*100.0,
3017 sched->nr_context_switch_bugs, sched->nr_timestamps);
3018 if (sched->nr_lost_events)
3019 printf(" (due to lost events?)");
3024 static void __merge_work_atoms(struct rb_root *root, struct work_atoms *data)
3026 struct rb_node **new = &(root->rb_node), *parent = NULL;
3027 struct work_atoms *this;
3028 const char *comm = thread__comm_str(data->thread), *this_comm;
3033 this = container_of(*new, struct work_atoms, node);
3036 this_comm = thread__comm_str(this->thread);
3037 cmp = strcmp(comm, this_comm);
3039 new = &((*new)->rb_left);
3040 } else if (cmp < 0) {
3041 new = &((*new)->rb_right);
3044 this->total_runtime += data->total_runtime;
3045 this->nb_atoms += data->nb_atoms;
3046 this->total_lat += data->total_lat;
3047 list_splice(&data->work_list, &this->work_list);
3048 if (this->max_lat < data->max_lat) {
3049 this->max_lat = data->max_lat;
3050 this->max_lat_at = data->max_lat_at;
3058 rb_link_node(&data->node, parent, new);
3059 rb_insert_color(&data->node, root);
3062 static void perf_sched__merge_lat(struct perf_sched *sched)
3064 struct work_atoms *data;
3065 struct rb_node *node;
3067 if (sched->skip_merge)
3070 while ((node = rb_first(&sched->atom_root))) {
3071 rb_erase(node, &sched->atom_root);
3072 data = rb_entry(node, struct work_atoms, node);
3073 __merge_work_atoms(&sched->merged_atom_root, data);
3077 static int perf_sched__lat(struct perf_sched *sched)
3079 struct rb_node *next;
3083 if (perf_sched__read_events(sched))
3086 perf_sched__merge_lat(sched);
3087 perf_sched__sort_lat(sched);
3089 printf("\n -----------------------------------------------------------------------------------------------------------------\n");
3090 printf(" Task | Runtime ms | Switches | Average delay ms | Maximum delay ms | Maximum delay at |\n");
3091 printf(" -----------------------------------------------------------------------------------------------------------------\n");
3093 next = rb_first(&sched->sorted_atom_root);
3096 struct work_atoms *work_list;
3098 work_list = rb_entry(next, struct work_atoms, node);
3099 output_lat_thread(sched, work_list);
3100 next = rb_next(next);
3101 thread__zput(work_list->thread);
3104 printf(" -----------------------------------------------------------------------------------------------------------------\n");
3105 printf(" TOTAL: |%11.3f ms |%9" PRIu64 " |\n",
3106 (double)sched->all_runtime / NSEC_PER_MSEC, sched->all_count);
3108 printf(" ---------------------------------------------------\n");
3110 print_bad_events(sched);
3116 static int setup_map_cpus(struct perf_sched *sched)
3118 struct cpu_map *map;
3120 sched->max_cpu = sysconf(_SC_NPROCESSORS_CONF);
3122 if (sched->map.comp) {
3123 sched->map.comp_cpus = zalloc(sched->max_cpu * sizeof(int));
3124 if (!sched->map.comp_cpus)
3128 if (!sched->map.cpus_str)
3131 map = cpu_map__new(sched->map.cpus_str);
3133 pr_err("failed to get cpus map from %s\n", sched->map.cpus_str);
3137 sched->map.cpus = map;
3141 static int setup_color_pids(struct perf_sched *sched)
3143 struct thread_map *map;
3145 if (!sched->map.color_pids_str)
3148 map = thread_map__new_by_tid_str(sched->map.color_pids_str);
3150 pr_err("failed to get thread map from %s\n", sched->map.color_pids_str);
3154 sched->map.color_pids = map;
3158 static int setup_color_cpus(struct perf_sched *sched)
3160 struct cpu_map *map;
3162 if (!sched->map.color_cpus_str)
3165 map = cpu_map__new(sched->map.color_cpus_str);
3167 pr_err("failed to get thread map from %s\n", sched->map.color_cpus_str);
3171 sched->map.color_cpus = map;
3175 static int perf_sched__map(struct perf_sched *sched)
3177 if (setup_map_cpus(sched))
3180 if (setup_color_pids(sched))
3183 if (setup_color_cpus(sched))
3187 if (perf_sched__read_events(sched))
3189 print_bad_events(sched);
3193 static int perf_sched__replay(struct perf_sched *sched)
3197 calibrate_run_measurement_overhead(sched);
3198 calibrate_sleep_measurement_overhead(sched);
3200 test_calibrations(sched);
3202 if (perf_sched__read_events(sched))
3205 printf("nr_run_events: %ld\n", sched->nr_run_events);
3206 printf("nr_sleep_events: %ld\n", sched->nr_sleep_events);
3207 printf("nr_wakeup_events: %ld\n", sched->nr_wakeup_events);
3209 if (sched->targetless_wakeups)
3210 printf("target-less wakeups: %ld\n", sched->targetless_wakeups);
3211 if (sched->multitarget_wakeups)
3212 printf("multi-target wakeups: %ld\n", sched->multitarget_wakeups);
3213 if (sched->nr_run_events_optimized)
3214 printf("run atoms optimized: %ld\n",
3215 sched->nr_run_events_optimized);
3217 print_task_traces(sched);
3218 add_cross_task_wakeups(sched);
3220 create_tasks(sched);
3221 printf("------------------------------------------------------------\n");
3222 for (i = 0; i < sched->replay_repeat; i++)
3223 run_one_test(sched);
3228 static void setup_sorting(struct perf_sched *sched, const struct option *options,
3229 const char * const usage_msg[])
3231 char *tmp, *tok, *str = strdup(sched->sort_order);
3233 for (tok = strtok_r(str, ", ", &tmp);
3234 tok; tok = strtok_r(NULL, ", ", &tmp)) {
3235 if (sort_dimension__add(tok, &sched->sort_list) < 0) {
3236 usage_with_options_msg(usage_msg, options,
3237 "Unknown --sort key: `%s'", tok);
3243 sort_dimension__add("pid", &sched->cmp_pid);
3246 static int __cmd_record(int argc, const char **argv)
3248 unsigned int rec_argc, i, j;
3249 const char **rec_argv;
3250 const char * const record_args[] = {
3256 "-e", "sched:sched_switch",
3257 "-e", "sched:sched_stat_wait",
3258 "-e", "sched:sched_stat_sleep",
3259 "-e", "sched:sched_stat_iowait",
3260 "-e", "sched:sched_stat_runtime",
3261 "-e", "sched:sched_process_fork",
3262 "-e", "sched:sched_wakeup",
3263 "-e", "sched:sched_wakeup_new",
3264 "-e", "sched:sched_migrate_task",
3267 rec_argc = ARRAY_SIZE(record_args) + argc - 1;
3268 rec_argv = calloc(rec_argc + 1, sizeof(char *));
3270 if (rec_argv == NULL)
3273 for (i = 0; i < ARRAY_SIZE(record_args); i++)
3274 rec_argv[i] = strdup(record_args[i]);
3276 for (j = 1; j < (unsigned int)argc; j++, i++)
3277 rec_argv[i] = argv[j];
3279 BUG_ON(i != rec_argc);
3281 return cmd_record(i, rec_argv);
3284 int cmd_sched(int argc, const char **argv)
3286 const char default_sort_order[] = "avg, max, switch, runtime";
3287 struct perf_sched sched = {
3289 .sample = perf_sched__process_tracepoint_sample,
3290 .comm = perf_event__process_comm,
3291 .namespaces = perf_event__process_namespaces,
3292 .lost = perf_event__process_lost,
3293 .fork = perf_sched__process_fork_event,
3294 .ordered_events = true,
3296 .cmp_pid = LIST_HEAD_INIT(sched.cmp_pid),
3297 .sort_list = LIST_HEAD_INIT(sched.sort_list),
3298 .start_work_mutex = PTHREAD_MUTEX_INITIALIZER,
3299 .work_done_wait_mutex = PTHREAD_MUTEX_INITIALIZER,
3300 .sort_order = default_sort_order,
3301 .replay_repeat = 10,
3303 .next_shortname1 = 'A',
3304 .next_shortname2 = '0',
3306 .show_callchain = 1,
3309 const struct option sched_options[] = {
3310 OPT_STRING('i', "input", &input_name, "file",
3312 OPT_INCR('v', "verbose", &verbose,
3313 "be more verbose (show symbol address, etc)"),
3314 OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
3315 "dump raw trace in ASCII"),
3316 OPT_BOOLEAN('f', "force", &sched.force, "don't complain, do it"),
3319 const struct option latency_options[] = {
3320 OPT_STRING('s', "sort", &sched.sort_order, "key[,key2...]",
3321 "sort by key(s): runtime, switch, avg, max"),
3322 OPT_INTEGER('C', "CPU", &sched.profile_cpu,
3323 "CPU to profile on"),
3324 OPT_BOOLEAN('p', "pids", &sched.skip_merge,
3325 "latency stats per pid instead of per comm"),
3326 OPT_PARENT(sched_options)
3328 const struct option replay_options[] = {
3329 OPT_UINTEGER('r', "repeat", &sched.replay_repeat,
3330 "repeat the workload replay N times (-1: infinite)"),
3331 OPT_PARENT(sched_options)
3333 const struct option map_options[] = {
3334 OPT_BOOLEAN(0, "compact", &sched.map.comp,
3335 "map output in compact mode"),
3336 OPT_STRING(0, "color-pids", &sched.map.color_pids_str, "pids",
3337 "highlight given pids in map"),
3338 OPT_STRING(0, "color-cpus", &sched.map.color_cpus_str, "cpus",
3339 "highlight given CPUs in map"),
3340 OPT_STRING(0, "cpus", &sched.map.cpus_str, "cpus",
3341 "display given CPUs in map"),
3342 OPT_PARENT(sched_options)
3344 const struct option timehist_options[] = {
3345 OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
3346 "file", "vmlinux pathname"),
3347 OPT_STRING(0, "kallsyms", &symbol_conf.kallsyms_name,
3348 "file", "kallsyms pathname"),
3349 OPT_BOOLEAN('g', "call-graph", &sched.show_callchain,
3350 "Display call chains if present (default on)"),
3351 OPT_UINTEGER(0, "max-stack", &sched.max_stack,
3352 "Maximum number of functions to display backtrace."),
3353 OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
3354 "Look for files with symbols relative to this directory"),
3355 OPT_BOOLEAN('s', "summary", &sched.summary_only,
3356 "Show only syscall summary with statistics"),
3357 OPT_BOOLEAN('S', "with-summary", &sched.summary,
3358 "Show all syscalls and summary with statistics"),
3359 OPT_BOOLEAN('w', "wakeups", &sched.show_wakeups, "Show wakeup events"),
3360 OPT_BOOLEAN('n', "next", &sched.show_next, "Show next task"),
3361 OPT_BOOLEAN('M', "migrations", &sched.show_migrations, "Show migration events"),
3362 OPT_BOOLEAN('V', "cpu-visual", &sched.show_cpu_visual, "Add CPU visual"),
3363 OPT_BOOLEAN('I', "idle-hist", &sched.idle_hist, "Show idle events only"),
3364 OPT_STRING(0, "time", &sched.time_str, "str",
3365 "Time span for analysis (start,stop)"),
3366 OPT_BOOLEAN(0, "state", &sched.show_state, "Show task state when sched-out"),
3367 OPT_PARENT(sched_options)
3370 const char * const latency_usage[] = {
3371 "perf sched latency [<options>]",
3374 const char * const replay_usage[] = {
3375 "perf sched replay [<options>]",
3378 const char * const map_usage[] = {
3379 "perf sched map [<options>]",
3382 const char * const timehist_usage[] = {
3383 "perf sched timehist [<options>]",
3386 const char *const sched_subcommands[] = { "record", "latency", "map",
3389 const char *sched_usage[] = {
3393 struct trace_sched_handler lat_ops = {
3394 .wakeup_event = latency_wakeup_event,
3395 .switch_event = latency_switch_event,
3396 .runtime_event = latency_runtime_event,
3397 .migrate_task_event = latency_migrate_task_event,
3399 struct trace_sched_handler map_ops = {
3400 .switch_event = map_switch_event,
3402 struct trace_sched_handler replay_ops = {
3403 .wakeup_event = replay_wakeup_event,
3404 .switch_event = replay_switch_event,
3405 .fork_event = replay_fork_event,
3409 for (i = 0; i < ARRAY_SIZE(sched.curr_pid); i++)
3410 sched.curr_pid[i] = -1;
3412 argc = parse_options_subcommand(argc, argv, sched_options, sched_subcommands,
3413 sched_usage, PARSE_OPT_STOP_AT_NON_OPTION);
3415 usage_with_options(sched_usage, sched_options);
3418 * Aliased to 'perf script' for now:
3420 if (!strcmp(argv[0], "script"))
3421 return cmd_script(argc, argv);
3423 if (!strncmp(argv[0], "rec", 3)) {
3424 return __cmd_record(argc, argv);
3425 } else if (!strncmp(argv[0], "lat", 3)) {
3426 sched.tp_handler = &lat_ops;
3428 argc = parse_options(argc, argv, latency_options, latency_usage, 0);
3430 usage_with_options(latency_usage, latency_options);
3432 setup_sorting(&sched, latency_options, latency_usage);
3433 return perf_sched__lat(&sched);
3434 } else if (!strcmp(argv[0], "map")) {
3436 argc = parse_options(argc, argv, map_options, map_usage, 0);
3438 usage_with_options(map_usage, map_options);
3440 sched.tp_handler = &map_ops;
3441 setup_sorting(&sched, latency_options, latency_usage);
3442 return perf_sched__map(&sched);
3443 } else if (!strncmp(argv[0], "rep", 3)) {
3444 sched.tp_handler = &replay_ops;
3446 argc = parse_options(argc, argv, replay_options, replay_usage, 0);
3448 usage_with_options(replay_usage, replay_options);
3450 return perf_sched__replay(&sched);
3451 } else if (!strcmp(argv[0], "timehist")) {
3453 argc = parse_options(argc, argv, timehist_options,
3456 usage_with_options(timehist_usage, timehist_options);
3458 if ((sched.show_wakeups || sched.show_next) &&
3459 sched.summary_only) {
3460 pr_err(" Error: -s and -[n|w] are mutually exclusive.\n");
3461 parse_options_usage(timehist_usage, timehist_options, "s", true);
3462 if (sched.show_wakeups)
3463 parse_options_usage(NULL, timehist_options, "w", true);
3464 if (sched.show_next)
3465 parse_options_usage(NULL, timehist_options, "n", true);
3469 return perf_sched__timehist(&sched);
3471 usage_with_options(sched_usage, sched_options);