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Merge branch 'stable/for-jens-4.2' of git://git.kernel.org/pub/scm/linux/kernel/git...
[deliverable/linux.git] / tools / perf / builtin-sched.c
1 #include "builtin.h"
2 #include "perf.h"
3
4 #include "util/util.h"
5 #include "util/evlist.h"
6 #include "util/cache.h"
7 #include "util/evsel.h"
8 #include "util/symbol.h"
9 #include "util/thread.h"
10 #include "util/header.h"
11 #include "util/session.h"
12 #include "util/tool.h"
13 #include "util/cloexec.h"
14
15 #include "util/parse-options.h"
16 #include "util/trace-event.h"
17
18 #include "util/debug.h"
19
20 #include <sys/prctl.h>
21 #include <sys/resource.h>
22
23 #include <semaphore.h>
24 #include <pthread.h>
25 #include <math.h>
26 #include <api/fs/fs.h>
27
28 #define PR_SET_NAME 15 /* Set process name */
29 #define MAX_CPUS 4096
30 #define COMM_LEN 20
31 #define SYM_LEN 129
32 #define MAX_PID 1024000
33
34 struct sched_atom;
35
36 struct task_desc {
37 unsigned long nr;
38 unsigned long pid;
39 char comm[COMM_LEN];
40
41 unsigned long nr_events;
42 unsigned long curr_event;
43 struct sched_atom **atoms;
44
45 pthread_t thread;
46 sem_t sleep_sem;
47
48 sem_t ready_for_work;
49 sem_t work_done_sem;
50
51 u64 cpu_usage;
52 };
53
54 enum sched_event_type {
55 SCHED_EVENT_RUN,
56 SCHED_EVENT_SLEEP,
57 SCHED_EVENT_WAKEUP,
58 SCHED_EVENT_MIGRATION,
59 };
60
61 struct sched_atom {
62 enum sched_event_type type;
63 int specific_wait;
64 u64 timestamp;
65 u64 duration;
66 unsigned long nr;
67 sem_t *wait_sem;
68 struct task_desc *wakee;
69 };
70
71 #define TASK_STATE_TO_CHAR_STR "RSDTtZXxKWP"
72
73 enum thread_state {
74 THREAD_SLEEPING = 0,
75 THREAD_WAIT_CPU,
76 THREAD_SCHED_IN,
77 THREAD_IGNORE
78 };
79
80 struct work_atom {
81 struct list_head list;
82 enum thread_state state;
83 u64 sched_out_time;
84 u64 wake_up_time;
85 u64 sched_in_time;
86 u64 runtime;
87 };
88
89 struct work_atoms {
90 struct list_head work_list;
91 struct thread *thread;
92 struct rb_node node;
93 u64 max_lat;
94 u64 max_lat_at;
95 u64 total_lat;
96 u64 nb_atoms;
97 u64 total_runtime;
98 int num_merged;
99 };
100
101 typedef int (*sort_fn_t)(struct work_atoms *, struct work_atoms *);
102
103 struct perf_sched;
104
105 struct trace_sched_handler {
106 int (*switch_event)(struct perf_sched *sched, struct perf_evsel *evsel,
107 struct perf_sample *sample, struct machine *machine);
108
109 int (*runtime_event)(struct perf_sched *sched, struct perf_evsel *evsel,
110 struct perf_sample *sample, struct machine *machine);
111
112 int (*wakeup_event)(struct perf_sched *sched, struct perf_evsel *evsel,
113 struct perf_sample *sample, struct machine *machine);
114
115 /* PERF_RECORD_FORK event, not sched_process_fork tracepoint */
116 int (*fork_event)(struct perf_sched *sched, union perf_event *event,
117 struct machine *machine);
118
119 int (*migrate_task_event)(struct perf_sched *sched,
120 struct perf_evsel *evsel,
121 struct perf_sample *sample,
122 struct machine *machine);
123 };
124
125 struct perf_sched {
126 struct perf_tool tool;
127 const char *sort_order;
128 unsigned long nr_tasks;
129 struct task_desc **pid_to_task;
130 struct task_desc **tasks;
131 const struct trace_sched_handler *tp_handler;
132 pthread_mutex_t start_work_mutex;
133 pthread_mutex_t work_done_wait_mutex;
134 int profile_cpu;
135 /*
136 * Track the current task - that way we can know whether there's any
137 * weird events, such as a task being switched away that is not current.
138 */
139 int max_cpu;
140 u32 curr_pid[MAX_CPUS];
141 struct thread *curr_thread[MAX_CPUS];
142 char next_shortname1;
143 char next_shortname2;
144 unsigned int replay_repeat;
145 unsigned long nr_run_events;
146 unsigned long nr_sleep_events;
147 unsigned long nr_wakeup_events;
148 unsigned long nr_sleep_corrections;
149 unsigned long nr_run_events_optimized;
150 unsigned long targetless_wakeups;
151 unsigned long multitarget_wakeups;
152 unsigned long nr_runs;
153 unsigned long nr_timestamps;
154 unsigned long nr_unordered_timestamps;
155 unsigned long nr_context_switch_bugs;
156 unsigned long nr_events;
157 unsigned long nr_lost_chunks;
158 unsigned long nr_lost_events;
159 u64 run_measurement_overhead;
160 u64 sleep_measurement_overhead;
161 u64 start_time;
162 u64 cpu_usage;
163 u64 runavg_cpu_usage;
164 u64 parent_cpu_usage;
165 u64 runavg_parent_cpu_usage;
166 u64 sum_runtime;
167 u64 sum_fluct;
168 u64 run_avg;
169 u64 all_runtime;
170 u64 all_count;
171 u64 cpu_last_switched[MAX_CPUS];
172 struct rb_root atom_root, sorted_atom_root, merged_atom_root;
173 struct list_head sort_list, cmp_pid;
174 bool force;
175 bool skip_merge;
176 };
177
178 static u64 get_nsecs(void)
179 {
180 struct timespec ts;
181
182 clock_gettime(CLOCK_MONOTONIC, &ts);
183
184 return ts.tv_sec * 1000000000ULL + ts.tv_nsec;
185 }
186
187 static void burn_nsecs(struct perf_sched *sched, u64 nsecs)
188 {
189 u64 T0 = get_nsecs(), T1;
190
191 do {
192 T1 = get_nsecs();
193 } while (T1 + sched->run_measurement_overhead < T0 + nsecs);
194 }
195
196 static void sleep_nsecs(u64 nsecs)
197 {
198 struct timespec ts;
199
200 ts.tv_nsec = nsecs % 999999999;
201 ts.tv_sec = nsecs / 999999999;
202
203 nanosleep(&ts, NULL);
204 }
205
206 static void calibrate_run_measurement_overhead(struct perf_sched *sched)
207 {
208 u64 T0, T1, delta, min_delta = 1000000000ULL;
209 int i;
210
211 for (i = 0; i < 10; i++) {
212 T0 = get_nsecs();
213 burn_nsecs(sched, 0);
214 T1 = get_nsecs();
215 delta = T1-T0;
216 min_delta = min(min_delta, delta);
217 }
218 sched->run_measurement_overhead = min_delta;
219
220 printf("run measurement overhead: %" PRIu64 " nsecs\n", min_delta);
221 }
222
223 static void calibrate_sleep_measurement_overhead(struct perf_sched *sched)
224 {
225 u64 T0, T1, delta, min_delta = 1000000000ULL;
226 int i;
227
228 for (i = 0; i < 10; i++) {
229 T0 = get_nsecs();
230 sleep_nsecs(10000);
231 T1 = get_nsecs();
232 delta = T1-T0;
233 min_delta = min(min_delta, delta);
234 }
235 min_delta -= 10000;
236 sched->sleep_measurement_overhead = min_delta;
237
238 printf("sleep measurement overhead: %" PRIu64 " nsecs\n", min_delta);
239 }
240
241 static struct sched_atom *
242 get_new_event(struct task_desc *task, u64 timestamp)
243 {
244 struct sched_atom *event = zalloc(sizeof(*event));
245 unsigned long idx = task->nr_events;
246 size_t size;
247
248 event->timestamp = timestamp;
249 event->nr = idx;
250
251 task->nr_events++;
252 size = sizeof(struct sched_atom *) * task->nr_events;
253 task->atoms = realloc(task->atoms, size);
254 BUG_ON(!task->atoms);
255
256 task->atoms[idx] = event;
257
258 return event;
259 }
260
261 static struct sched_atom *last_event(struct task_desc *task)
262 {
263 if (!task->nr_events)
264 return NULL;
265
266 return task->atoms[task->nr_events - 1];
267 }
268
269 static void add_sched_event_run(struct perf_sched *sched, struct task_desc *task,
270 u64 timestamp, u64 duration)
271 {
272 struct sched_atom *event, *curr_event = last_event(task);
273
274 /*
275 * optimize an existing RUN event by merging this one
276 * to it:
277 */
278 if (curr_event && curr_event->type == SCHED_EVENT_RUN) {
279 sched->nr_run_events_optimized++;
280 curr_event->duration += duration;
281 return;
282 }
283
284 event = get_new_event(task, timestamp);
285
286 event->type = SCHED_EVENT_RUN;
287 event->duration = duration;
288
289 sched->nr_run_events++;
290 }
291
292 static void add_sched_event_wakeup(struct perf_sched *sched, struct task_desc *task,
293 u64 timestamp, struct task_desc *wakee)
294 {
295 struct sched_atom *event, *wakee_event;
296
297 event = get_new_event(task, timestamp);
298 event->type = SCHED_EVENT_WAKEUP;
299 event->wakee = wakee;
300
301 wakee_event = last_event(wakee);
302 if (!wakee_event || wakee_event->type != SCHED_EVENT_SLEEP) {
303 sched->targetless_wakeups++;
304 return;
305 }
306 if (wakee_event->wait_sem) {
307 sched->multitarget_wakeups++;
308 return;
309 }
310
311 wakee_event->wait_sem = zalloc(sizeof(*wakee_event->wait_sem));
312 sem_init(wakee_event->wait_sem, 0, 0);
313 wakee_event->specific_wait = 1;
314 event->wait_sem = wakee_event->wait_sem;
315
316 sched->nr_wakeup_events++;
317 }
318
319 static void add_sched_event_sleep(struct perf_sched *sched, struct task_desc *task,
320 u64 timestamp, u64 task_state __maybe_unused)
321 {
322 struct sched_atom *event = get_new_event(task, timestamp);
323
324 event->type = SCHED_EVENT_SLEEP;
325
326 sched->nr_sleep_events++;
327 }
328
329 static struct task_desc *register_pid(struct perf_sched *sched,
330 unsigned long pid, const char *comm)
331 {
332 struct task_desc *task;
333 static int pid_max;
334
335 if (sched->pid_to_task == NULL) {
336 if (sysctl__read_int("kernel/pid_max", &pid_max) < 0)
337 pid_max = MAX_PID;
338 BUG_ON((sched->pid_to_task = calloc(pid_max, sizeof(struct task_desc *))) == NULL);
339 }
340 if (pid >= (unsigned long)pid_max) {
341 BUG_ON((sched->pid_to_task = realloc(sched->pid_to_task, (pid + 1) *
342 sizeof(struct task_desc *))) == NULL);
343 while (pid >= (unsigned long)pid_max)
344 sched->pid_to_task[pid_max++] = NULL;
345 }
346
347 task = sched->pid_to_task[pid];
348
349 if (task)
350 return task;
351
352 task = zalloc(sizeof(*task));
353 task->pid = pid;
354 task->nr = sched->nr_tasks;
355 strcpy(task->comm, comm);
356 /*
357 * every task starts in sleeping state - this gets ignored
358 * if there's no wakeup pointing to this sleep state:
359 */
360 add_sched_event_sleep(sched, task, 0, 0);
361
362 sched->pid_to_task[pid] = task;
363 sched->nr_tasks++;
364 sched->tasks = realloc(sched->tasks, sched->nr_tasks * sizeof(struct task_desc *));
365 BUG_ON(!sched->tasks);
366 sched->tasks[task->nr] = task;
367
368 if (verbose)
369 printf("registered task #%ld, PID %ld (%s)\n", sched->nr_tasks, pid, comm);
370
371 return task;
372 }
373
374
375 static void print_task_traces(struct perf_sched *sched)
376 {
377 struct task_desc *task;
378 unsigned long i;
379
380 for (i = 0; i < sched->nr_tasks; i++) {
381 task = sched->tasks[i];
382 printf("task %6ld (%20s:%10ld), nr_events: %ld\n",
383 task->nr, task->comm, task->pid, task->nr_events);
384 }
385 }
386
387 static void add_cross_task_wakeups(struct perf_sched *sched)
388 {
389 struct task_desc *task1, *task2;
390 unsigned long i, j;
391
392 for (i = 0; i < sched->nr_tasks; i++) {
393 task1 = sched->tasks[i];
394 j = i + 1;
395 if (j == sched->nr_tasks)
396 j = 0;
397 task2 = sched->tasks[j];
398 add_sched_event_wakeup(sched, task1, 0, task2);
399 }
400 }
401
402 static void perf_sched__process_event(struct perf_sched *sched,
403 struct sched_atom *atom)
404 {
405 int ret = 0;
406
407 switch (atom->type) {
408 case SCHED_EVENT_RUN:
409 burn_nsecs(sched, atom->duration);
410 break;
411 case SCHED_EVENT_SLEEP:
412 if (atom->wait_sem)
413 ret = sem_wait(atom->wait_sem);
414 BUG_ON(ret);
415 break;
416 case SCHED_EVENT_WAKEUP:
417 if (atom->wait_sem)
418 ret = sem_post(atom->wait_sem);
419 BUG_ON(ret);
420 break;
421 case SCHED_EVENT_MIGRATION:
422 break;
423 default:
424 BUG_ON(1);
425 }
426 }
427
428 static u64 get_cpu_usage_nsec_parent(void)
429 {
430 struct rusage ru;
431 u64 sum;
432 int err;
433
434 err = getrusage(RUSAGE_SELF, &ru);
435 BUG_ON(err);
436
437 sum = ru.ru_utime.tv_sec*1e9 + ru.ru_utime.tv_usec*1e3;
438 sum += ru.ru_stime.tv_sec*1e9 + ru.ru_stime.tv_usec*1e3;
439
440 return sum;
441 }
442
443 static int self_open_counters(struct perf_sched *sched, unsigned long cur_task)
444 {
445 struct perf_event_attr attr;
446 char sbuf[STRERR_BUFSIZE], info[STRERR_BUFSIZE];
447 int fd;
448 struct rlimit limit;
449 bool need_privilege = false;
450
451 memset(&attr, 0, sizeof(attr));
452
453 attr.type = PERF_TYPE_SOFTWARE;
454 attr.config = PERF_COUNT_SW_TASK_CLOCK;
455
456 force_again:
457 fd = sys_perf_event_open(&attr, 0, -1, -1,
458 perf_event_open_cloexec_flag());
459
460 if (fd < 0) {
461 if (errno == EMFILE) {
462 if (sched->force) {
463 BUG_ON(getrlimit(RLIMIT_NOFILE, &limit) == -1);
464 limit.rlim_cur += sched->nr_tasks - cur_task;
465 if (limit.rlim_cur > limit.rlim_max) {
466 limit.rlim_max = limit.rlim_cur;
467 need_privilege = true;
468 }
469 if (setrlimit(RLIMIT_NOFILE, &limit) == -1) {
470 if (need_privilege && errno == EPERM)
471 strcpy(info, "Need privilege\n");
472 } else
473 goto force_again;
474 } else
475 strcpy(info, "Have a try with -f option\n");
476 }
477 pr_err("Error: sys_perf_event_open() syscall returned "
478 "with %d (%s)\n%s", fd,
479 strerror_r(errno, sbuf, sizeof(sbuf)), info);
480 exit(EXIT_FAILURE);
481 }
482 return fd;
483 }
484
485 static u64 get_cpu_usage_nsec_self(int fd)
486 {
487 u64 runtime;
488 int ret;
489
490 ret = read(fd, &runtime, sizeof(runtime));
491 BUG_ON(ret != sizeof(runtime));
492
493 return runtime;
494 }
495
496 struct sched_thread_parms {
497 struct task_desc *task;
498 struct perf_sched *sched;
499 int fd;
500 };
501
502 static void *thread_func(void *ctx)
503 {
504 struct sched_thread_parms *parms = ctx;
505 struct task_desc *this_task = parms->task;
506 struct perf_sched *sched = parms->sched;
507 u64 cpu_usage_0, cpu_usage_1;
508 unsigned long i, ret;
509 char comm2[22];
510 int fd = parms->fd;
511
512 zfree(&parms);
513
514 sprintf(comm2, ":%s", this_task->comm);
515 prctl(PR_SET_NAME, comm2);
516 if (fd < 0)
517 return NULL;
518 again:
519 ret = sem_post(&this_task->ready_for_work);
520 BUG_ON(ret);
521 ret = pthread_mutex_lock(&sched->start_work_mutex);
522 BUG_ON(ret);
523 ret = pthread_mutex_unlock(&sched->start_work_mutex);
524 BUG_ON(ret);
525
526 cpu_usage_0 = get_cpu_usage_nsec_self(fd);
527
528 for (i = 0; i < this_task->nr_events; i++) {
529 this_task->curr_event = i;
530 perf_sched__process_event(sched, this_task->atoms[i]);
531 }
532
533 cpu_usage_1 = get_cpu_usage_nsec_self(fd);
534 this_task->cpu_usage = cpu_usage_1 - cpu_usage_0;
535 ret = sem_post(&this_task->work_done_sem);
536 BUG_ON(ret);
537
538 ret = pthread_mutex_lock(&sched->work_done_wait_mutex);
539 BUG_ON(ret);
540 ret = pthread_mutex_unlock(&sched->work_done_wait_mutex);
541 BUG_ON(ret);
542
543 goto again;
544 }
545
546 static void create_tasks(struct perf_sched *sched)
547 {
548 struct task_desc *task;
549 pthread_attr_t attr;
550 unsigned long i;
551 int err;
552
553 err = pthread_attr_init(&attr);
554 BUG_ON(err);
555 err = pthread_attr_setstacksize(&attr,
556 (size_t) max(16 * 1024, PTHREAD_STACK_MIN));
557 BUG_ON(err);
558 err = pthread_mutex_lock(&sched->start_work_mutex);
559 BUG_ON(err);
560 err = pthread_mutex_lock(&sched->work_done_wait_mutex);
561 BUG_ON(err);
562 for (i = 0; i < sched->nr_tasks; i++) {
563 struct sched_thread_parms *parms = malloc(sizeof(*parms));
564 BUG_ON(parms == NULL);
565 parms->task = task = sched->tasks[i];
566 parms->sched = sched;
567 parms->fd = self_open_counters(sched, i);
568 sem_init(&task->sleep_sem, 0, 0);
569 sem_init(&task->ready_for_work, 0, 0);
570 sem_init(&task->work_done_sem, 0, 0);
571 task->curr_event = 0;
572 err = pthread_create(&task->thread, &attr, thread_func, parms);
573 BUG_ON(err);
574 }
575 }
576
577 static void wait_for_tasks(struct perf_sched *sched)
578 {
579 u64 cpu_usage_0, cpu_usage_1;
580 struct task_desc *task;
581 unsigned long i, ret;
582
583 sched->start_time = get_nsecs();
584 sched->cpu_usage = 0;
585 pthread_mutex_unlock(&sched->work_done_wait_mutex);
586
587 for (i = 0; i < sched->nr_tasks; i++) {
588 task = sched->tasks[i];
589 ret = sem_wait(&task->ready_for_work);
590 BUG_ON(ret);
591 sem_init(&task->ready_for_work, 0, 0);
592 }
593 ret = pthread_mutex_lock(&sched->work_done_wait_mutex);
594 BUG_ON(ret);
595
596 cpu_usage_0 = get_cpu_usage_nsec_parent();
597
598 pthread_mutex_unlock(&sched->start_work_mutex);
599
600 for (i = 0; i < sched->nr_tasks; i++) {
601 task = sched->tasks[i];
602 ret = sem_wait(&task->work_done_sem);
603 BUG_ON(ret);
604 sem_init(&task->work_done_sem, 0, 0);
605 sched->cpu_usage += task->cpu_usage;
606 task->cpu_usage = 0;
607 }
608
609 cpu_usage_1 = get_cpu_usage_nsec_parent();
610 if (!sched->runavg_cpu_usage)
611 sched->runavg_cpu_usage = sched->cpu_usage;
612 sched->runavg_cpu_usage = (sched->runavg_cpu_usage * (sched->replay_repeat - 1) + sched->cpu_usage) / sched->replay_repeat;
613
614 sched->parent_cpu_usage = cpu_usage_1 - cpu_usage_0;
615 if (!sched->runavg_parent_cpu_usage)
616 sched->runavg_parent_cpu_usage = sched->parent_cpu_usage;
617 sched->runavg_parent_cpu_usage = (sched->runavg_parent_cpu_usage * (sched->replay_repeat - 1) +
618 sched->parent_cpu_usage)/sched->replay_repeat;
619
620 ret = pthread_mutex_lock(&sched->start_work_mutex);
621 BUG_ON(ret);
622
623 for (i = 0; i < sched->nr_tasks; i++) {
624 task = sched->tasks[i];
625 sem_init(&task->sleep_sem, 0, 0);
626 task->curr_event = 0;
627 }
628 }
629
630 static void run_one_test(struct perf_sched *sched)
631 {
632 u64 T0, T1, delta, avg_delta, fluct;
633
634 T0 = get_nsecs();
635 wait_for_tasks(sched);
636 T1 = get_nsecs();
637
638 delta = T1 - T0;
639 sched->sum_runtime += delta;
640 sched->nr_runs++;
641
642 avg_delta = sched->sum_runtime / sched->nr_runs;
643 if (delta < avg_delta)
644 fluct = avg_delta - delta;
645 else
646 fluct = delta - avg_delta;
647 sched->sum_fluct += fluct;
648 if (!sched->run_avg)
649 sched->run_avg = delta;
650 sched->run_avg = (sched->run_avg * (sched->replay_repeat - 1) + delta) / sched->replay_repeat;
651
652 printf("#%-3ld: %0.3f, ", sched->nr_runs, (double)delta / 1000000.0);
653
654 printf("ravg: %0.2f, ", (double)sched->run_avg / 1e6);
655
656 printf("cpu: %0.2f / %0.2f",
657 (double)sched->cpu_usage / 1e6, (double)sched->runavg_cpu_usage / 1e6);
658
659 #if 0
660 /*
661 * rusage statistics done by the parent, these are less
662 * accurate than the sched->sum_exec_runtime based statistics:
663 */
664 printf(" [%0.2f / %0.2f]",
665 (double)sched->parent_cpu_usage/1e6,
666 (double)sched->runavg_parent_cpu_usage/1e6);
667 #endif
668
669 printf("\n");
670
671 if (sched->nr_sleep_corrections)
672 printf(" (%ld sleep corrections)\n", sched->nr_sleep_corrections);
673 sched->nr_sleep_corrections = 0;
674 }
675
676 static void test_calibrations(struct perf_sched *sched)
677 {
678 u64 T0, T1;
679
680 T0 = get_nsecs();
681 burn_nsecs(sched, 1e6);
682 T1 = get_nsecs();
683
684 printf("the run test took %" PRIu64 " nsecs\n", T1 - T0);
685
686 T0 = get_nsecs();
687 sleep_nsecs(1e6);
688 T1 = get_nsecs();
689
690 printf("the sleep test took %" PRIu64 " nsecs\n", T1 - T0);
691 }
692
693 static int
694 replay_wakeup_event(struct perf_sched *sched,
695 struct perf_evsel *evsel, struct perf_sample *sample,
696 struct machine *machine __maybe_unused)
697 {
698 const char *comm = perf_evsel__strval(evsel, sample, "comm");
699 const u32 pid = perf_evsel__intval(evsel, sample, "pid");
700 struct task_desc *waker, *wakee;
701
702 if (verbose) {
703 printf("sched_wakeup event %p\n", evsel);
704
705 printf(" ... pid %d woke up %s/%d\n", sample->tid, comm, pid);
706 }
707
708 waker = register_pid(sched, sample->tid, "<unknown>");
709 wakee = register_pid(sched, pid, comm);
710
711 add_sched_event_wakeup(sched, waker, sample->time, wakee);
712 return 0;
713 }
714
715 static int replay_switch_event(struct perf_sched *sched,
716 struct perf_evsel *evsel,
717 struct perf_sample *sample,
718 struct machine *machine __maybe_unused)
719 {
720 const char *prev_comm = perf_evsel__strval(evsel, sample, "prev_comm"),
721 *next_comm = perf_evsel__strval(evsel, sample, "next_comm");
722 const u32 prev_pid = perf_evsel__intval(evsel, sample, "prev_pid"),
723 next_pid = perf_evsel__intval(evsel, sample, "next_pid");
724 const u64 prev_state = perf_evsel__intval(evsel, sample, "prev_state");
725 struct task_desc *prev, __maybe_unused *next;
726 u64 timestamp0, timestamp = sample->time;
727 int cpu = sample->cpu;
728 s64 delta;
729
730 if (verbose)
731 printf("sched_switch event %p\n", evsel);
732
733 if (cpu >= MAX_CPUS || cpu < 0)
734 return 0;
735
736 timestamp0 = sched->cpu_last_switched[cpu];
737 if (timestamp0)
738 delta = timestamp - timestamp0;
739 else
740 delta = 0;
741
742 if (delta < 0) {
743 pr_err("hm, delta: %" PRIu64 " < 0 ?\n", delta);
744 return -1;
745 }
746
747 pr_debug(" ... switch from %s/%d to %s/%d [ran %" PRIu64 " nsecs]\n",
748 prev_comm, prev_pid, next_comm, next_pid, delta);
749
750 prev = register_pid(sched, prev_pid, prev_comm);
751 next = register_pid(sched, next_pid, next_comm);
752
753 sched->cpu_last_switched[cpu] = timestamp;
754
755 add_sched_event_run(sched, prev, timestamp, delta);
756 add_sched_event_sleep(sched, prev, timestamp, prev_state);
757
758 return 0;
759 }
760
761 static int replay_fork_event(struct perf_sched *sched,
762 union perf_event *event,
763 struct machine *machine)
764 {
765 struct thread *child, *parent;
766
767 child = machine__findnew_thread(machine, event->fork.pid,
768 event->fork.tid);
769 parent = machine__findnew_thread(machine, event->fork.ppid,
770 event->fork.ptid);
771
772 if (child == NULL || parent == NULL) {
773 pr_debug("thread does not exist on fork event: child %p, parent %p\n",
774 child, parent);
775 goto out_put;
776 }
777
778 if (verbose) {
779 printf("fork event\n");
780 printf("... parent: %s/%d\n", thread__comm_str(parent), parent->tid);
781 printf("... child: %s/%d\n", thread__comm_str(child), child->tid);
782 }
783
784 register_pid(sched, parent->tid, thread__comm_str(parent));
785 register_pid(sched, child->tid, thread__comm_str(child));
786 out_put:
787 thread__put(child);
788 thread__put(parent);
789 return 0;
790 }
791
792 struct sort_dimension {
793 const char *name;
794 sort_fn_t cmp;
795 struct list_head list;
796 };
797
798 static int
799 thread_lat_cmp(struct list_head *list, struct work_atoms *l, struct work_atoms *r)
800 {
801 struct sort_dimension *sort;
802 int ret = 0;
803
804 BUG_ON(list_empty(list));
805
806 list_for_each_entry(sort, list, list) {
807 ret = sort->cmp(l, r);
808 if (ret)
809 return ret;
810 }
811
812 return ret;
813 }
814
815 static struct work_atoms *
816 thread_atoms_search(struct rb_root *root, struct thread *thread,
817 struct list_head *sort_list)
818 {
819 struct rb_node *node = root->rb_node;
820 struct work_atoms key = { .thread = thread };
821
822 while (node) {
823 struct work_atoms *atoms;
824 int cmp;
825
826 atoms = container_of(node, struct work_atoms, node);
827
828 cmp = thread_lat_cmp(sort_list, &key, atoms);
829 if (cmp > 0)
830 node = node->rb_left;
831 else if (cmp < 0)
832 node = node->rb_right;
833 else {
834 BUG_ON(thread != atoms->thread);
835 return atoms;
836 }
837 }
838 return NULL;
839 }
840
841 static void
842 __thread_latency_insert(struct rb_root *root, struct work_atoms *data,
843 struct list_head *sort_list)
844 {
845 struct rb_node **new = &(root->rb_node), *parent = NULL;
846
847 while (*new) {
848 struct work_atoms *this;
849 int cmp;
850
851 this = container_of(*new, struct work_atoms, node);
852 parent = *new;
853
854 cmp = thread_lat_cmp(sort_list, data, this);
855
856 if (cmp > 0)
857 new = &((*new)->rb_left);
858 else
859 new = &((*new)->rb_right);
860 }
861
862 rb_link_node(&data->node, parent, new);
863 rb_insert_color(&data->node, root);
864 }
865
866 static int thread_atoms_insert(struct perf_sched *sched, struct thread *thread)
867 {
868 struct work_atoms *atoms = zalloc(sizeof(*atoms));
869 if (!atoms) {
870 pr_err("No memory at %s\n", __func__);
871 return -1;
872 }
873
874 atoms->thread = thread__get(thread);
875 INIT_LIST_HEAD(&atoms->work_list);
876 __thread_latency_insert(&sched->atom_root, atoms, &sched->cmp_pid);
877 return 0;
878 }
879
880 static char sched_out_state(u64 prev_state)
881 {
882 const char *str = TASK_STATE_TO_CHAR_STR;
883
884 return str[prev_state];
885 }
886
887 static int
888 add_sched_out_event(struct work_atoms *atoms,
889 char run_state,
890 u64 timestamp)
891 {
892 struct work_atom *atom = zalloc(sizeof(*atom));
893 if (!atom) {
894 pr_err("Non memory at %s", __func__);
895 return -1;
896 }
897
898 atom->sched_out_time = timestamp;
899
900 if (run_state == 'R') {
901 atom->state = THREAD_WAIT_CPU;
902 atom->wake_up_time = atom->sched_out_time;
903 }
904
905 list_add_tail(&atom->list, &atoms->work_list);
906 return 0;
907 }
908
909 static void
910 add_runtime_event(struct work_atoms *atoms, u64 delta,
911 u64 timestamp __maybe_unused)
912 {
913 struct work_atom *atom;
914
915 BUG_ON(list_empty(&atoms->work_list));
916
917 atom = list_entry(atoms->work_list.prev, struct work_atom, list);
918
919 atom->runtime += delta;
920 atoms->total_runtime += delta;
921 }
922
923 static void
924 add_sched_in_event(struct work_atoms *atoms, u64 timestamp)
925 {
926 struct work_atom *atom;
927 u64 delta;
928
929 if (list_empty(&atoms->work_list))
930 return;
931
932 atom = list_entry(atoms->work_list.prev, struct work_atom, list);
933
934 if (atom->state != THREAD_WAIT_CPU)
935 return;
936
937 if (timestamp < atom->wake_up_time) {
938 atom->state = THREAD_IGNORE;
939 return;
940 }
941
942 atom->state = THREAD_SCHED_IN;
943 atom->sched_in_time = timestamp;
944
945 delta = atom->sched_in_time - atom->wake_up_time;
946 atoms->total_lat += delta;
947 if (delta > atoms->max_lat) {
948 atoms->max_lat = delta;
949 atoms->max_lat_at = timestamp;
950 }
951 atoms->nb_atoms++;
952 }
953
954 static int latency_switch_event(struct perf_sched *sched,
955 struct perf_evsel *evsel,
956 struct perf_sample *sample,
957 struct machine *machine)
958 {
959 const u32 prev_pid = perf_evsel__intval(evsel, sample, "prev_pid"),
960 next_pid = perf_evsel__intval(evsel, sample, "next_pid");
961 const u64 prev_state = perf_evsel__intval(evsel, sample, "prev_state");
962 struct work_atoms *out_events, *in_events;
963 struct thread *sched_out, *sched_in;
964 u64 timestamp0, timestamp = sample->time;
965 int cpu = sample->cpu, err = -1;
966 s64 delta;
967
968 BUG_ON(cpu >= MAX_CPUS || cpu < 0);
969
970 timestamp0 = sched->cpu_last_switched[cpu];
971 sched->cpu_last_switched[cpu] = timestamp;
972 if (timestamp0)
973 delta = timestamp - timestamp0;
974 else
975 delta = 0;
976
977 if (delta < 0) {
978 pr_err("hm, delta: %" PRIu64 " < 0 ?\n", delta);
979 return -1;
980 }
981
982 sched_out = machine__findnew_thread(machine, -1, prev_pid);
983 sched_in = machine__findnew_thread(machine, -1, next_pid);
984 if (sched_out == NULL || sched_in == NULL)
985 goto out_put;
986
987 out_events = thread_atoms_search(&sched->atom_root, sched_out, &sched->cmp_pid);
988 if (!out_events) {
989 if (thread_atoms_insert(sched, sched_out))
990 goto out_put;
991 out_events = thread_atoms_search(&sched->atom_root, sched_out, &sched->cmp_pid);
992 if (!out_events) {
993 pr_err("out-event: Internal tree error");
994 goto out_put;
995 }
996 }
997 if (add_sched_out_event(out_events, sched_out_state(prev_state), timestamp))
998 return -1;
999
1000 in_events = thread_atoms_search(&sched->atom_root, sched_in, &sched->cmp_pid);
1001 if (!in_events) {
1002 if (thread_atoms_insert(sched, sched_in))
1003 goto out_put;
1004 in_events = thread_atoms_search(&sched->atom_root, sched_in, &sched->cmp_pid);
1005 if (!in_events) {
1006 pr_err("in-event: Internal tree error");
1007 goto out_put;
1008 }
1009 /*
1010 * Take came in we have not heard about yet,
1011 * add in an initial atom in runnable state:
1012 */
1013 if (add_sched_out_event(in_events, 'R', timestamp))
1014 goto out_put;
1015 }
1016 add_sched_in_event(in_events, timestamp);
1017 err = 0;
1018 out_put:
1019 thread__put(sched_out);
1020 thread__put(sched_in);
1021 return err;
1022 }
1023
1024 static int latency_runtime_event(struct perf_sched *sched,
1025 struct perf_evsel *evsel,
1026 struct perf_sample *sample,
1027 struct machine *machine)
1028 {
1029 const u32 pid = perf_evsel__intval(evsel, sample, "pid");
1030 const u64 runtime = perf_evsel__intval(evsel, sample, "runtime");
1031 struct thread *thread = machine__findnew_thread(machine, -1, pid);
1032 struct work_atoms *atoms = thread_atoms_search(&sched->atom_root, thread, &sched->cmp_pid);
1033 u64 timestamp = sample->time;
1034 int cpu = sample->cpu, err = -1;
1035
1036 if (thread == NULL)
1037 return -1;
1038
1039 BUG_ON(cpu >= MAX_CPUS || cpu < 0);
1040 if (!atoms) {
1041 if (thread_atoms_insert(sched, thread))
1042 goto out_put;
1043 atoms = thread_atoms_search(&sched->atom_root, thread, &sched->cmp_pid);
1044 if (!atoms) {
1045 pr_err("in-event: Internal tree error");
1046 goto out_put;
1047 }
1048 if (add_sched_out_event(atoms, 'R', timestamp))
1049 goto out_put;
1050 }
1051
1052 add_runtime_event(atoms, runtime, timestamp);
1053 err = 0;
1054 out_put:
1055 thread__put(thread);
1056 return err;
1057 }
1058
1059 static int latency_wakeup_event(struct perf_sched *sched,
1060 struct perf_evsel *evsel,
1061 struct perf_sample *sample,
1062 struct machine *machine)
1063 {
1064 const u32 pid = perf_evsel__intval(evsel, sample, "pid");
1065 struct work_atoms *atoms;
1066 struct work_atom *atom;
1067 struct thread *wakee;
1068 u64 timestamp = sample->time;
1069 int err = -1;
1070
1071 wakee = machine__findnew_thread(machine, -1, pid);
1072 if (wakee == NULL)
1073 return -1;
1074 atoms = thread_atoms_search(&sched->atom_root, wakee, &sched->cmp_pid);
1075 if (!atoms) {
1076 if (thread_atoms_insert(sched, wakee))
1077 goto out_put;
1078 atoms = thread_atoms_search(&sched->atom_root, wakee, &sched->cmp_pid);
1079 if (!atoms) {
1080 pr_err("wakeup-event: Internal tree error");
1081 goto out_put;
1082 }
1083 if (add_sched_out_event(atoms, 'S', timestamp))
1084 goto out_put;
1085 }
1086
1087 BUG_ON(list_empty(&atoms->work_list));
1088
1089 atom = list_entry(atoms->work_list.prev, struct work_atom, list);
1090
1091 /*
1092 * As we do not guarantee the wakeup event happens when
1093 * task is out of run queue, also may happen when task is
1094 * on run queue and wakeup only change ->state to TASK_RUNNING,
1095 * then we should not set the ->wake_up_time when wake up a
1096 * task which is on run queue.
1097 *
1098 * You WILL be missing events if you've recorded only
1099 * one CPU, or are only looking at only one, so don't
1100 * skip in this case.
1101 */
1102 if (sched->profile_cpu == -1 && atom->state != THREAD_SLEEPING)
1103 goto out_ok;
1104
1105 sched->nr_timestamps++;
1106 if (atom->sched_out_time > timestamp) {
1107 sched->nr_unordered_timestamps++;
1108 goto out_ok;
1109 }
1110
1111 atom->state = THREAD_WAIT_CPU;
1112 atom->wake_up_time = timestamp;
1113 out_ok:
1114 err = 0;
1115 out_put:
1116 thread__put(wakee);
1117 return err;
1118 }
1119
1120 static int latency_migrate_task_event(struct perf_sched *sched,
1121 struct perf_evsel *evsel,
1122 struct perf_sample *sample,
1123 struct machine *machine)
1124 {
1125 const u32 pid = perf_evsel__intval(evsel, sample, "pid");
1126 u64 timestamp = sample->time;
1127 struct work_atoms *atoms;
1128 struct work_atom *atom;
1129 struct thread *migrant;
1130 int err = -1;
1131
1132 /*
1133 * Only need to worry about migration when profiling one CPU.
1134 */
1135 if (sched->profile_cpu == -1)
1136 return 0;
1137
1138 migrant = machine__findnew_thread(machine, -1, pid);
1139 if (migrant == NULL)
1140 return -1;
1141 atoms = thread_atoms_search(&sched->atom_root, migrant, &sched->cmp_pid);
1142 if (!atoms) {
1143 if (thread_atoms_insert(sched, migrant))
1144 goto out_put;
1145 register_pid(sched, migrant->tid, thread__comm_str(migrant));
1146 atoms = thread_atoms_search(&sched->atom_root, migrant, &sched->cmp_pid);
1147 if (!atoms) {
1148 pr_err("migration-event: Internal tree error");
1149 goto out_put;
1150 }
1151 if (add_sched_out_event(atoms, 'R', timestamp))
1152 goto out_put;
1153 }
1154
1155 BUG_ON(list_empty(&atoms->work_list));
1156
1157 atom = list_entry(atoms->work_list.prev, struct work_atom, list);
1158 atom->sched_in_time = atom->sched_out_time = atom->wake_up_time = timestamp;
1159
1160 sched->nr_timestamps++;
1161
1162 if (atom->sched_out_time > timestamp)
1163 sched->nr_unordered_timestamps++;
1164 err = 0;
1165 out_put:
1166 thread__put(migrant);
1167 return err;
1168 }
1169
1170 static void output_lat_thread(struct perf_sched *sched, struct work_atoms *work_list)
1171 {
1172 int i;
1173 int ret;
1174 u64 avg;
1175
1176 if (!work_list->nb_atoms)
1177 return;
1178 /*
1179 * Ignore idle threads:
1180 */
1181 if (!strcmp(thread__comm_str(work_list->thread), "swapper"))
1182 return;
1183
1184 sched->all_runtime += work_list->total_runtime;
1185 sched->all_count += work_list->nb_atoms;
1186
1187 if (work_list->num_merged > 1)
1188 ret = printf(" %s:(%d) ", thread__comm_str(work_list->thread), work_list->num_merged);
1189 else
1190 ret = printf(" %s:%d ", thread__comm_str(work_list->thread), work_list->thread->tid);
1191
1192 for (i = 0; i < 24 - ret; i++)
1193 printf(" ");
1194
1195 avg = work_list->total_lat / work_list->nb_atoms;
1196
1197 printf("|%11.3f ms |%9" PRIu64 " | avg:%9.3f ms | max:%9.3f ms | max at: %13.6f s\n",
1198 (double)work_list->total_runtime / 1e6,
1199 work_list->nb_atoms, (double)avg / 1e6,
1200 (double)work_list->max_lat / 1e6,
1201 (double)work_list->max_lat_at / 1e9);
1202 }
1203
1204 static int pid_cmp(struct work_atoms *l, struct work_atoms *r)
1205 {
1206 if (l->thread->tid < r->thread->tid)
1207 return -1;
1208 if (l->thread->tid > r->thread->tid)
1209 return 1;
1210
1211 return 0;
1212 }
1213
1214 static int avg_cmp(struct work_atoms *l, struct work_atoms *r)
1215 {
1216 u64 avgl, avgr;
1217
1218 if (!l->nb_atoms)
1219 return -1;
1220
1221 if (!r->nb_atoms)
1222 return 1;
1223
1224 avgl = l->total_lat / l->nb_atoms;
1225 avgr = r->total_lat / r->nb_atoms;
1226
1227 if (avgl < avgr)
1228 return -1;
1229 if (avgl > avgr)
1230 return 1;
1231
1232 return 0;
1233 }
1234
1235 static int max_cmp(struct work_atoms *l, struct work_atoms *r)
1236 {
1237 if (l->max_lat < r->max_lat)
1238 return -1;
1239 if (l->max_lat > r->max_lat)
1240 return 1;
1241
1242 return 0;
1243 }
1244
1245 static int switch_cmp(struct work_atoms *l, struct work_atoms *r)
1246 {
1247 if (l->nb_atoms < r->nb_atoms)
1248 return -1;
1249 if (l->nb_atoms > r->nb_atoms)
1250 return 1;
1251
1252 return 0;
1253 }
1254
1255 static int runtime_cmp(struct work_atoms *l, struct work_atoms *r)
1256 {
1257 if (l->total_runtime < r->total_runtime)
1258 return -1;
1259 if (l->total_runtime > r->total_runtime)
1260 return 1;
1261
1262 return 0;
1263 }
1264
1265 static int sort_dimension__add(const char *tok, struct list_head *list)
1266 {
1267 size_t i;
1268 static struct sort_dimension avg_sort_dimension = {
1269 .name = "avg",
1270 .cmp = avg_cmp,
1271 };
1272 static struct sort_dimension max_sort_dimension = {
1273 .name = "max",
1274 .cmp = max_cmp,
1275 };
1276 static struct sort_dimension pid_sort_dimension = {
1277 .name = "pid",
1278 .cmp = pid_cmp,
1279 };
1280 static struct sort_dimension runtime_sort_dimension = {
1281 .name = "runtime",
1282 .cmp = runtime_cmp,
1283 };
1284 static struct sort_dimension switch_sort_dimension = {
1285 .name = "switch",
1286 .cmp = switch_cmp,
1287 };
1288 struct sort_dimension *available_sorts[] = {
1289 &pid_sort_dimension,
1290 &avg_sort_dimension,
1291 &max_sort_dimension,
1292 &switch_sort_dimension,
1293 &runtime_sort_dimension,
1294 };
1295
1296 for (i = 0; i < ARRAY_SIZE(available_sorts); i++) {
1297 if (!strcmp(available_sorts[i]->name, tok)) {
1298 list_add_tail(&available_sorts[i]->list, list);
1299
1300 return 0;
1301 }
1302 }
1303
1304 return -1;
1305 }
1306
1307 static void perf_sched__sort_lat(struct perf_sched *sched)
1308 {
1309 struct rb_node *node;
1310 struct rb_root *root = &sched->atom_root;
1311 again:
1312 for (;;) {
1313 struct work_atoms *data;
1314 node = rb_first(root);
1315 if (!node)
1316 break;
1317
1318 rb_erase(node, root);
1319 data = rb_entry(node, struct work_atoms, node);
1320 __thread_latency_insert(&sched->sorted_atom_root, data, &sched->sort_list);
1321 }
1322 if (root == &sched->atom_root) {
1323 root = &sched->merged_atom_root;
1324 goto again;
1325 }
1326 }
1327
1328 static int process_sched_wakeup_event(struct perf_tool *tool,
1329 struct perf_evsel *evsel,
1330 struct perf_sample *sample,
1331 struct machine *machine)
1332 {
1333 struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
1334
1335 if (sched->tp_handler->wakeup_event)
1336 return sched->tp_handler->wakeup_event(sched, evsel, sample, machine);
1337
1338 return 0;
1339 }
1340
1341 static int map_switch_event(struct perf_sched *sched, struct perf_evsel *evsel,
1342 struct perf_sample *sample, struct machine *machine)
1343 {
1344 const u32 next_pid = perf_evsel__intval(evsel, sample, "next_pid");
1345 struct thread *sched_in;
1346 int new_shortname;
1347 u64 timestamp0, timestamp = sample->time;
1348 s64 delta;
1349 int cpu, this_cpu = sample->cpu;
1350
1351 BUG_ON(this_cpu >= MAX_CPUS || this_cpu < 0);
1352
1353 if (this_cpu > sched->max_cpu)
1354 sched->max_cpu = this_cpu;
1355
1356 timestamp0 = sched->cpu_last_switched[this_cpu];
1357 sched->cpu_last_switched[this_cpu] = timestamp;
1358 if (timestamp0)
1359 delta = timestamp - timestamp0;
1360 else
1361 delta = 0;
1362
1363 if (delta < 0) {
1364 pr_err("hm, delta: %" PRIu64 " < 0 ?\n", delta);
1365 return -1;
1366 }
1367
1368 sched_in = machine__findnew_thread(machine, -1, next_pid);
1369 if (sched_in == NULL)
1370 return -1;
1371
1372 sched->curr_thread[this_cpu] = thread__get(sched_in);
1373
1374 printf(" ");
1375
1376 new_shortname = 0;
1377 if (!sched_in->shortname[0]) {
1378 if (!strcmp(thread__comm_str(sched_in), "swapper")) {
1379 /*
1380 * Don't allocate a letter-number for swapper:0
1381 * as a shortname. Instead, we use '.' for it.
1382 */
1383 sched_in->shortname[0] = '.';
1384 sched_in->shortname[1] = ' ';
1385 } else {
1386 sched_in->shortname[0] = sched->next_shortname1;
1387 sched_in->shortname[1] = sched->next_shortname2;
1388
1389 if (sched->next_shortname1 < 'Z') {
1390 sched->next_shortname1++;
1391 } else {
1392 sched->next_shortname1 = 'A';
1393 if (sched->next_shortname2 < '9')
1394 sched->next_shortname2++;
1395 else
1396 sched->next_shortname2 = '0';
1397 }
1398 }
1399 new_shortname = 1;
1400 }
1401
1402 for (cpu = 0; cpu <= sched->max_cpu; cpu++) {
1403 if (cpu != this_cpu)
1404 printf(" ");
1405 else
1406 printf("*");
1407
1408 if (sched->curr_thread[cpu])
1409 printf("%2s ", sched->curr_thread[cpu]->shortname);
1410 else
1411 printf(" ");
1412 }
1413
1414 printf(" %12.6f secs ", (double)timestamp/1e9);
1415 if (new_shortname) {
1416 printf("%s => %s:%d\n",
1417 sched_in->shortname, thread__comm_str(sched_in), sched_in->tid);
1418 } else {
1419 printf("\n");
1420 }
1421
1422 thread__put(sched_in);
1423
1424 return 0;
1425 }
1426
1427 static int process_sched_switch_event(struct perf_tool *tool,
1428 struct perf_evsel *evsel,
1429 struct perf_sample *sample,
1430 struct machine *machine)
1431 {
1432 struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
1433 int this_cpu = sample->cpu, err = 0;
1434 u32 prev_pid = perf_evsel__intval(evsel, sample, "prev_pid"),
1435 next_pid = perf_evsel__intval(evsel, sample, "next_pid");
1436
1437 if (sched->curr_pid[this_cpu] != (u32)-1) {
1438 /*
1439 * Are we trying to switch away a PID that is
1440 * not current?
1441 */
1442 if (sched->curr_pid[this_cpu] != prev_pid)
1443 sched->nr_context_switch_bugs++;
1444 }
1445
1446 if (sched->tp_handler->switch_event)
1447 err = sched->tp_handler->switch_event(sched, evsel, sample, machine);
1448
1449 sched->curr_pid[this_cpu] = next_pid;
1450 return err;
1451 }
1452
1453 static int process_sched_runtime_event(struct perf_tool *tool,
1454 struct perf_evsel *evsel,
1455 struct perf_sample *sample,
1456 struct machine *machine)
1457 {
1458 struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
1459
1460 if (sched->tp_handler->runtime_event)
1461 return sched->tp_handler->runtime_event(sched, evsel, sample, machine);
1462
1463 return 0;
1464 }
1465
1466 static int perf_sched__process_fork_event(struct perf_tool *tool,
1467 union perf_event *event,
1468 struct perf_sample *sample,
1469 struct machine *machine)
1470 {
1471 struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
1472
1473 /* run the fork event through the perf machineruy */
1474 perf_event__process_fork(tool, event, sample, machine);
1475
1476 /* and then run additional processing needed for this command */
1477 if (sched->tp_handler->fork_event)
1478 return sched->tp_handler->fork_event(sched, event, machine);
1479
1480 return 0;
1481 }
1482
1483 static int process_sched_migrate_task_event(struct perf_tool *tool,
1484 struct perf_evsel *evsel,
1485 struct perf_sample *sample,
1486 struct machine *machine)
1487 {
1488 struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
1489
1490 if (sched->tp_handler->migrate_task_event)
1491 return sched->tp_handler->migrate_task_event(sched, evsel, sample, machine);
1492
1493 return 0;
1494 }
1495
1496 typedef int (*tracepoint_handler)(struct perf_tool *tool,
1497 struct perf_evsel *evsel,
1498 struct perf_sample *sample,
1499 struct machine *machine);
1500
1501 static int perf_sched__process_tracepoint_sample(struct perf_tool *tool __maybe_unused,
1502 union perf_event *event __maybe_unused,
1503 struct perf_sample *sample,
1504 struct perf_evsel *evsel,
1505 struct machine *machine)
1506 {
1507 int err = 0;
1508
1509 if (evsel->handler != NULL) {
1510 tracepoint_handler f = evsel->handler;
1511 err = f(tool, evsel, sample, machine);
1512 }
1513
1514 return err;
1515 }
1516
1517 static int perf_sched__read_events(struct perf_sched *sched)
1518 {
1519 const struct perf_evsel_str_handler handlers[] = {
1520 { "sched:sched_switch", process_sched_switch_event, },
1521 { "sched:sched_stat_runtime", process_sched_runtime_event, },
1522 { "sched:sched_wakeup", process_sched_wakeup_event, },
1523 { "sched:sched_wakeup_new", process_sched_wakeup_event, },
1524 { "sched:sched_migrate_task", process_sched_migrate_task_event, },
1525 };
1526 struct perf_session *session;
1527 struct perf_data_file file = {
1528 .path = input_name,
1529 .mode = PERF_DATA_MODE_READ,
1530 .force = sched->force,
1531 };
1532 int rc = -1;
1533
1534 session = perf_session__new(&file, false, &sched->tool);
1535 if (session == NULL) {
1536 pr_debug("No Memory for session\n");
1537 return -1;
1538 }
1539
1540 symbol__init(&session->header.env);
1541
1542 if (perf_session__set_tracepoints_handlers(session, handlers))
1543 goto out_delete;
1544
1545 if (perf_session__has_traces(session, "record -R")) {
1546 int err = perf_session__process_events(session);
1547 if (err) {
1548 pr_err("Failed to process events, error %d", err);
1549 goto out_delete;
1550 }
1551
1552 sched->nr_events = session->evlist->stats.nr_events[0];
1553 sched->nr_lost_events = session->evlist->stats.total_lost;
1554 sched->nr_lost_chunks = session->evlist->stats.nr_events[PERF_RECORD_LOST];
1555 }
1556
1557 rc = 0;
1558 out_delete:
1559 perf_session__delete(session);
1560 return rc;
1561 }
1562
1563 static void print_bad_events(struct perf_sched *sched)
1564 {
1565 if (sched->nr_unordered_timestamps && sched->nr_timestamps) {
1566 printf(" INFO: %.3f%% unordered timestamps (%ld out of %ld)\n",
1567 (double)sched->nr_unordered_timestamps/(double)sched->nr_timestamps*100.0,
1568 sched->nr_unordered_timestamps, sched->nr_timestamps);
1569 }
1570 if (sched->nr_lost_events && sched->nr_events) {
1571 printf(" INFO: %.3f%% lost events (%ld out of %ld, in %ld chunks)\n",
1572 (double)sched->nr_lost_events/(double)sched->nr_events * 100.0,
1573 sched->nr_lost_events, sched->nr_events, sched->nr_lost_chunks);
1574 }
1575 if (sched->nr_context_switch_bugs && sched->nr_timestamps) {
1576 printf(" INFO: %.3f%% context switch bugs (%ld out of %ld)",
1577 (double)sched->nr_context_switch_bugs/(double)sched->nr_timestamps*100.0,
1578 sched->nr_context_switch_bugs, sched->nr_timestamps);
1579 if (sched->nr_lost_events)
1580 printf(" (due to lost events?)");
1581 printf("\n");
1582 }
1583 }
1584
1585 static void __merge_work_atoms(struct rb_root *root, struct work_atoms *data)
1586 {
1587 struct rb_node **new = &(root->rb_node), *parent = NULL;
1588 struct work_atoms *this;
1589 const char *comm = thread__comm_str(data->thread), *this_comm;
1590
1591 while (*new) {
1592 int cmp;
1593
1594 this = container_of(*new, struct work_atoms, node);
1595 parent = *new;
1596
1597 this_comm = thread__comm_str(this->thread);
1598 cmp = strcmp(comm, this_comm);
1599 if (cmp > 0) {
1600 new = &((*new)->rb_left);
1601 } else if (cmp < 0) {
1602 new = &((*new)->rb_right);
1603 } else {
1604 this->num_merged++;
1605 this->total_runtime += data->total_runtime;
1606 this->nb_atoms += data->nb_atoms;
1607 this->total_lat += data->total_lat;
1608 list_splice(&data->work_list, &this->work_list);
1609 if (this->max_lat < data->max_lat) {
1610 this->max_lat = data->max_lat;
1611 this->max_lat_at = data->max_lat_at;
1612 }
1613 zfree(&data);
1614 return;
1615 }
1616 }
1617
1618 data->num_merged++;
1619 rb_link_node(&data->node, parent, new);
1620 rb_insert_color(&data->node, root);
1621 }
1622
1623 static void perf_sched__merge_lat(struct perf_sched *sched)
1624 {
1625 struct work_atoms *data;
1626 struct rb_node *node;
1627
1628 if (sched->skip_merge)
1629 return;
1630
1631 while ((node = rb_first(&sched->atom_root))) {
1632 rb_erase(node, &sched->atom_root);
1633 data = rb_entry(node, struct work_atoms, node);
1634 __merge_work_atoms(&sched->merged_atom_root, data);
1635 }
1636 }
1637
1638 static int perf_sched__lat(struct perf_sched *sched)
1639 {
1640 struct rb_node *next;
1641
1642 setup_pager();
1643
1644 if (perf_sched__read_events(sched))
1645 return -1;
1646
1647 perf_sched__merge_lat(sched);
1648 perf_sched__sort_lat(sched);
1649
1650 printf("\n -----------------------------------------------------------------------------------------------------------------\n");
1651 printf(" Task | Runtime ms | Switches | Average delay ms | Maximum delay ms | Maximum delay at |\n");
1652 printf(" -----------------------------------------------------------------------------------------------------------------\n");
1653
1654 next = rb_first(&sched->sorted_atom_root);
1655
1656 while (next) {
1657 struct work_atoms *work_list;
1658
1659 work_list = rb_entry(next, struct work_atoms, node);
1660 output_lat_thread(sched, work_list);
1661 next = rb_next(next);
1662 thread__zput(work_list->thread);
1663 }
1664
1665 printf(" -----------------------------------------------------------------------------------------------------------------\n");
1666 printf(" TOTAL: |%11.3f ms |%9" PRIu64 " |\n",
1667 (double)sched->all_runtime / 1e6, sched->all_count);
1668
1669 printf(" ---------------------------------------------------\n");
1670
1671 print_bad_events(sched);
1672 printf("\n");
1673
1674 return 0;
1675 }
1676
1677 static int perf_sched__map(struct perf_sched *sched)
1678 {
1679 sched->max_cpu = sysconf(_SC_NPROCESSORS_CONF);
1680
1681 setup_pager();
1682 if (perf_sched__read_events(sched))
1683 return -1;
1684 print_bad_events(sched);
1685 return 0;
1686 }
1687
1688 static int perf_sched__replay(struct perf_sched *sched)
1689 {
1690 unsigned long i;
1691
1692 calibrate_run_measurement_overhead(sched);
1693 calibrate_sleep_measurement_overhead(sched);
1694
1695 test_calibrations(sched);
1696
1697 if (perf_sched__read_events(sched))
1698 return -1;
1699
1700 printf("nr_run_events: %ld\n", sched->nr_run_events);
1701 printf("nr_sleep_events: %ld\n", sched->nr_sleep_events);
1702 printf("nr_wakeup_events: %ld\n", sched->nr_wakeup_events);
1703
1704 if (sched->targetless_wakeups)
1705 printf("target-less wakeups: %ld\n", sched->targetless_wakeups);
1706 if (sched->multitarget_wakeups)
1707 printf("multi-target wakeups: %ld\n", sched->multitarget_wakeups);
1708 if (sched->nr_run_events_optimized)
1709 printf("run atoms optimized: %ld\n",
1710 sched->nr_run_events_optimized);
1711
1712 print_task_traces(sched);
1713 add_cross_task_wakeups(sched);
1714
1715 create_tasks(sched);
1716 printf("------------------------------------------------------------\n");
1717 for (i = 0; i < sched->replay_repeat; i++)
1718 run_one_test(sched);
1719
1720 return 0;
1721 }
1722
1723 static void setup_sorting(struct perf_sched *sched, const struct option *options,
1724 const char * const usage_msg[])
1725 {
1726 char *tmp, *tok, *str = strdup(sched->sort_order);
1727
1728 for (tok = strtok_r(str, ", ", &tmp);
1729 tok; tok = strtok_r(NULL, ", ", &tmp)) {
1730 if (sort_dimension__add(tok, &sched->sort_list) < 0) {
1731 error("Unknown --sort key: `%s'", tok);
1732 usage_with_options(usage_msg, options);
1733 }
1734 }
1735
1736 free(str);
1737
1738 sort_dimension__add("pid", &sched->cmp_pid);
1739 }
1740
1741 static int __cmd_record(int argc, const char **argv)
1742 {
1743 unsigned int rec_argc, i, j;
1744 const char **rec_argv;
1745 const char * const record_args[] = {
1746 "record",
1747 "-a",
1748 "-R",
1749 "-m", "1024",
1750 "-c", "1",
1751 "-e", "sched:sched_switch",
1752 "-e", "sched:sched_stat_wait",
1753 "-e", "sched:sched_stat_sleep",
1754 "-e", "sched:sched_stat_iowait",
1755 "-e", "sched:sched_stat_runtime",
1756 "-e", "sched:sched_process_fork",
1757 "-e", "sched:sched_wakeup",
1758 "-e", "sched:sched_wakeup_new",
1759 "-e", "sched:sched_migrate_task",
1760 };
1761
1762 rec_argc = ARRAY_SIZE(record_args) + argc - 1;
1763 rec_argv = calloc(rec_argc + 1, sizeof(char *));
1764
1765 if (rec_argv == NULL)
1766 return -ENOMEM;
1767
1768 for (i = 0; i < ARRAY_SIZE(record_args); i++)
1769 rec_argv[i] = strdup(record_args[i]);
1770
1771 for (j = 1; j < (unsigned int)argc; j++, i++)
1772 rec_argv[i] = argv[j];
1773
1774 BUG_ON(i != rec_argc);
1775
1776 return cmd_record(i, rec_argv, NULL);
1777 }
1778
1779 int cmd_sched(int argc, const char **argv, const char *prefix __maybe_unused)
1780 {
1781 const char default_sort_order[] = "avg, max, switch, runtime";
1782 struct perf_sched sched = {
1783 .tool = {
1784 .sample = perf_sched__process_tracepoint_sample,
1785 .comm = perf_event__process_comm,
1786 .lost = perf_event__process_lost,
1787 .fork = perf_sched__process_fork_event,
1788 .ordered_events = true,
1789 },
1790 .cmp_pid = LIST_HEAD_INIT(sched.cmp_pid),
1791 .sort_list = LIST_HEAD_INIT(sched.sort_list),
1792 .start_work_mutex = PTHREAD_MUTEX_INITIALIZER,
1793 .work_done_wait_mutex = PTHREAD_MUTEX_INITIALIZER,
1794 .sort_order = default_sort_order,
1795 .replay_repeat = 10,
1796 .profile_cpu = -1,
1797 .next_shortname1 = 'A',
1798 .next_shortname2 = '0',
1799 .skip_merge = 0,
1800 };
1801 const struct option latency_options[] = {
1802 OPT_STRING('s', "sort", &sched.sort_order, "key[,key2...]",
1803 "sort by key(s): runtime, switch, avg, max"),
1804 OPT_INCR('v', "verbose", &verbose,
1805 "be more verbose (show symbol address, etc)"),
1806 OPT_INTEGER('C', "CPU", &sched.profile_cpu,
1807 "CPU to profile on"),
1808 OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
1809 "dump raw trace in ASCII"),
1810 OPT_BOOLEAN('p', "pids", &sched.skip_merge,
1811 "latency stats per pid instead of per comm"),
1812 OPT_END()
1813 };
1814 const struct option replay_options[] = {
1815 OPT_UINTEGER('r', "repeat", &sched.replay_repeat,
1816 "repeat the workload replay N times (-1: infinite)"),
1817 OPT_INCR('v', "verbose", &verbose,
1818 "be more verbose (show symbol address, etc)"),
1819 OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
1820 "dump raw trace in ASCII"),
1821 OPT_BOOLEAN('f', "force", &sched.force, "don't complain, do it"),
1822 OPT_END()
1823 };
1824 const struct option sched_options[] = {
1825 OPT_STRING('i', "input", &input_name, "file",
1826 "input file name"),
1827 OPT_INCR('v', "verbose", &verbose,
1828 "be more verbose (show symbol address, etc)"),
1829 OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
1830 "dump raw trace in ASCII"),
1831 OPT_END()
1832 };
1833 const char * const latency_usage[] = {
1834 "perf sched latency [<options>]",
1835 NULL
1836 };
1837 const char * const replay_usage[] = {
1838 "perf sched replay [<options>]",
1839 NULL
1840 };
1841 const char *const sched_subcommands[] = { "record", "latency", "map",
1842 "replay", "script", NULL };
1843 const char *sched_usage[] = {
1844 NULL,
1845 NULL
1846 };
1847 struct trace_sched_handler lat_ops = {
1848 .wakeup_event = latency_wakeup_event,
1849 .switch_event = latency_switch_event,
1850 .runtime_event = latency_runtime_event,
1851 .migrate_task_event = latency_migrate_task_event,
1852 };
1853 struct trace_sched_handler map_ops = {
1854 .switch_event = map_switch_event,
1855 };
1856 struct trace_sched_handler replay_ops = {
1857 .wakeup_event = replay_wakeup_event,
1858 .switch_event = replay_switch_event,
1859 .fork_event = replay_fork_event,
1860 };
1861 unsigned int i;
1862
1863 for (i = 0; i < ARRAY_SIZE(sched.curr_pid); i++)
1864 sched.curr_pid[i] = -1;
1865
1866 argc = parse_options_subcommand(argc, argv, sched_options, sched_subcommands,
1867 sched_usage, PARSE_OPT_STOP_AT_NON_OPTION);
1868 if (!argc)
1869 usage_with_options(sched_usage, sched_options);
1870
1871 /*
1872 * Aliased to 'perf script' for now:
1873 */
1874 if (!strcmp(argv[0], "script"))
1875 return cmd_script(argc, argv, prefix);
1876
1877 if (!strncmp(argv[0], "rec", 3)) {
1878 return __cmd_record(argc, argv);
1879 } else if (!strncmp(argv[0], "lat", 3)) {
1880 sched.tp_handler = &lat_ops;
1881 if (argc > 1) {
1882 argc = parse_options(argc, argv, latency_options, latency_usage, 0);
1883 if (argc)
1884 usage_with_options(latency_usage, latency_options);
1885 }
1886 setup_sorting(&sched, latency_options, latency_usage);
1887 return perf_sched__lat(&sched);
1888 } else if (!strcmp(argv[0], "map")) {
1889 sched.tp_handler = &map_ops;
1890 setup_sorting(&sched, latency_options, latency_usage);
1891 return perf_sched__map(&sched);
1892 } else if (!strncmp(argv[0], "rep", 3)) {
1893 sched.tp_handler = &replay_ops;
1894 if (argc) {
1895 argc = parse_options(argc, argv, replay_options, replay_usage, 0);
1896 if (argc)
1897 usage_with_options(replay_usage, replay_options);
1898 }
1899 return perf_sched__replay(&sched);
1900 } else {
1901 usage_with_options(sched_usage, sched_options);
1902 }
1903
1904 return 0;
1905 }
Linux kernel - Deliverables
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