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drm/panthor: Don't add write fences to the shared BOs
[drm/drm-misc.git] / kernel / sched / debug.c
blobf4035c7a0fa1df365222300f443f87a6fe02dd71
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * kernel/sched/debug.c
4 *
5 * Print the CFS rbtree and other debugging details
6 *
7 * Copyright(C) 2007, Red Hat, Inc., Ingo Molnar
8 */
9
10 /*
11 * This allows printing both to /sys/kernel/debug/sched/debug and
12 * to the console
13 */
14 #define SEQ_printf(m, x...) \
15 do { \
16 if (m) \
17 seq_printf(m, x); \
18 else \
19 pr_cont(x); \
20 } while (0)
21
22 /*
23 * Ease the printing of nsec fields:
24 */
25 static long long nsec_high(unsigned long long nsec)
26 {
27 if ((long long)nsec < 0) {
28 nsec = -nsec;
29 do_div(nsec, 1000000);
30 return -nsec;
31 }
32 do_div(nsec, 1000000);
33
34 return nsec;
35 }
36
37 static unsigned long nsec_low(unsigned long long nsec)
38 {
39 if ((long long)nsec < 0)
40 nsec = -nsec;
41
42 return do_div(nsec, 1000000);
43 }
44
45 #define SPLIT_NS(x) nsec_high(x), nsec_low(x)
46
47 #define SCHED_FEAT(name, enabled) \
48 #name ,
49
50 static const char * const sched_feat_names[] = {
51 #include "features.h"
52 };
53
54 #undef SCHED_FEAT
55
56 static int sched_feat_show(struct seq_file *m, void *v)
57 {
58 int i;
59
60 for (i = 0; i < __SCHED_FEAT_NR; i++) {
61 if (!(sysctl_sched_features & (1UL << i)))
62 seq_puts(m, "NO_");
63 seq_printf(m, "%s ", sched_feat_names[i]);
64 }
65 seq_puts(m, "\n");
66
67 return 0;
68 }
69
70 #ifdef CONFIG_JUMP_LABEL
71
72 #define jump_label_key__true STATIC_KEY_INIT_TRUE
73 #define jump_label_key__false STATIC_KEY_INIT_FALSE
74
75 #define SCHED_FEAT(name, enabled) \
76 jump_label_key__##enabled ,
77
78 struct static_key sched_feat_keys[__SCHED_FEAT_NR] = {
79 #include "features.h"
80 };
81
82 #undef SCHED_FEAT
83
84 static void sched_feat_disable(int i)
85 {
86 static_key_disable_cpuslocked(&sched_feat_keys[i]);
87 }
88
89 static void sched_feat_enable(int i)
90 {
91 static_key_enable_cpuslocked(&sched_feat_keys[i]);
92 }
93 #else
94 static void sched_feat_disable(int i) { };
95 static void sched_feat_enable(int i) { };
96 #endif /* CONFIG_JUMP_LABEL */
97
98 static int sched_feat_set(char *cmp)
99 {
100 int i;
101 int neg = 0;
102
103 if (strncmp(cmp, "NO_", 3) == 0) {
104 neg = 1;
105 cmp += 3;
106 }
107
108 i = match_string(sched_feat_names, __SCHED_FEAT_NR, cmp);
109 if (i < 0)
110 return i;
111
112 if (neg) {
113 sysctl_sched_features &= ~(1UL << i);
114 sched_feat_disable(i);
115 } else {
116 sysctl_sched_features |= (1UL << i);
117 sched_feat_enable(i);
118 }
119
120 return 0;
121 }
122
123 static ssize_t
124 sched_feat_write(struct file *filp, const char __user *ubuf,
125 size_t cnt, loff_t *ppos)
126 {
127 char buf[64];
128 char *cmp;
129 int ret;
130 struct inode *inode;
131
132 if (cnt > 63)
133 cnt = 63;
134
135 if (copy_from_user(&buf, ubuf, cnt))
136 return -EFAULT;
137
138 buf[cnt] = 0;
139 cmp = strstrip(buf);
140
141 /* Ensure the static_key remains in a consistent state */
142 inode = file_inode(filp);
143 cpus_read_lock();
144 inode_lock(inode);
145 ret = sched_feat_set(cmp);
146 inode_unlock(inode);
147 cpus_read_unlock();
148 if (ret < 0)
149 return ret;
150
151 *ppos += cnt;
152
153 return cnt;
154 }
155
156 static int sched_feat_open(struct inode *inode, struct file *filp)
157 {
158 return single_open(filp, sched_feat_show, NULL);
159 }
160
161 static const struct file_operations sched_feat_fops = {
162 .open = sched_feat_open,
163 .write = sched_feat_write,
164 .read = seq_read,
165 .llseek = seq_lseek,
166 .release = single_release,
167 };
168
169 #ifdef CONFIG_SMP
170
171 static ssize_t sched_scaling_write(struct file *filp, const char __user *ubuf,
172 size_t cnt, loff_t *ppos)
173 {
174 char buf[16];
175 unsigned int scaling;
176
177 if (cnt > 15)
178 cnt = 15;
179
180 if (copy_from_user(&buf, ubuf, cnt))
181 return -EFAULT;
182 buf[cnt] = '\0';
183
184 if (kstrtouint(buf, 10, &scaling))
185 return -EINVAL;
186
187 if (scaling >= SCHED_TUNABLESCALING_END)
188 return -EINVAL;
189
190 sysctl_sched_tunable_scaling = scaling;
191 if (sched_update_scaling())
192 return -EINVAL;
193
194 *ppos += cnt;
195 return cnt;
196 }
197
198 static int sched_scaling_show(struct seq_file *m, void *v)
199 {
200 seq_printf(m, "%d\n", sysctl_sched_tunable_scaling);
201 return 0;
202 }
203
204 static int sched_scaling_open(struct inode *inode, struct file *filp)
205 {
206 return single_open(filp, sched_scaling_show, NULL);
207 }
208
209 static const struct file_operations sched_scaling_fops = {
210 .open = sched_scaling_open,
211 .write = sched_scaling_write,
212 .read = seq_read,
213 .llseek = seq_lseek,
214 .release = single_release,
215 };
216
217 #endif /* SMP */
218
219 #ifdef CONFIG_PREEMPT_DYNAMIC
220
221 static ssize_t sched_dynamic_write(struct file *filp, const char __user *ubuf,
222 size_t cnt, loff_t *ppos)
223 {
224 char buf[16];
225 int mode;
226
227 if (cnt > 15)
228 cnt = 15;
229
230 if (copy_from_user(&buf, ubuf, cnt))
231 return -EFAULT;
232
233 buf[cnt] = 0;
234 mode = sched_dynamic_mode(strstrip(buf));
235 if (mode < 0)
236 return mode;
237
238 sched_dynamic_update(mode);
239
240 *ppos += cnt;
241
242 return cnt;
243 }
244
245 static int sched_dynamic_show(struct seq_file *m, void *v)
246 {
247 static const char * preempt_modes[] = {
248 "none", "voluntary", "full"
249 };
250 int i;
251
252 for (i = 0; i < ARRAY_SIZE(preempt_modes); i++) {
253 if (preempt_dynamic_mode == i)
254 seq_puts(m, "(");
255 seq_puts(m, preempt_modes[i]);
256 if (preempt_dynamic_mode == i)
257 seq_puts(m, ")");
258
259 seq_puts(m, " ");
260 }
261
262 seq_puts(m, "\n");
263 return 0;
264 }
265
266 static int sched_dynamic_open(struct inode *inode, struct file *filp)
267 {
268 return single_open(filp, sched_dynamic_show, NULL);
269 }
270
271 static const struct file_operations sched_dynamic_fops = {
272 .open = sched_dynamic_open,
273 .write = sched_dynamic_write,
274 .read = seq_read,
275 .llseek = seq_lseek,
276 .release = single_release,
277 };
278
279 #endif /* CONFIG_PREEMPT_DYNAMIC */
280
281 __read_mostly bool sched_debug_verbose;
282
283 #ifdef CONFIG_SMP
284 static struct dentry *sd_dentry;
285
286
287 static ssize_t sched_verbose_write(struct file *filp, const char __user *ubuf,
288 size_t cnt, loff_t *ppos)
289 {
290 ssize_t result;
291 bool orig;
292
293 cpus_read_lock();
294 mutex_lock(&sched_domains_mutex);
295
296 orig = sched_debug_verbose;
297 result = debugfs_write_file_bool(filp, ubuf, cnt, ppos);
298
299 if (sched_debug_verbose && !orig)
300 update_sched_domain_debugfs();
301 else if (!sched_debug_verbose && orig) {
302 debugfs_remove(sd_dentry);
303 sd_dentry = NULL;
304 }
305
306 mutex_unlock(&sched_domains_mutex);
307 cpus_read_unlock();
308
309 return result;
310 }
311 #else
312 #define sched_verbose_write debugfs_write_file_bool
313 #endif
314
315 static const struct file_operations sched_verbose_fops = {
316 .read = debugfs_read_file_bool,
317 .write = sched_verbose_write,
318 .open = simple_open,
319 .llseek = default_llseek,
320 };
321
322 static const struct seq_operations sched_debug_sops;
323
324 static int sched_debug_open(struct inode *inode, struct file *filp)
325 {
326 return seq_open(filp, &sched_debug_sops);
327 }
328
329 static const struct file_operations sched_debug_fops = {
330 .open = sched_debug_open,
331 .read = seq_read,
332 .llseek = seq_lseek,
333 .release = seq_release,
334 };
335
336 enum dl_param {
337 DL_RUNTIME = 0,
338 DL_PERIOD,
339 };
340
341 static unsigned long fair_server_period_max = (1UL << 22) * NSEC_PER_USEC; /* ~4 seconds */
342 static unsigned long fair_server_period_min = (100) * NSEC_PER_USEC; /* 100 us */
343
344 static ssize_t sched_fair_server_write(struct file *filp, const char __user *ubuf,
345 size_t cnt, loff_t *ppos, enum dl_param param)
346 {
347 long cpu = (long) ((struct seq_file *) filp->private_data)->private;
348 struct rq *rq = cpu_rq(cpu);
349 u64 runtime, period;
350 size_t err;
351 int retval;
352 u64 value;
353
354 err = kstrtoull_from_user(ubuf, cnt, 10, &value);
355 if (err)
356 return err;
357
358 scoped_guard (rq_lock_irqsave, rq) {
359 runtime = rq->fair_server.dl_runtime;
360 period = rq->fair_server.dl_period;
361
362 switch (param) {
363 case DL_RUNTIME:
364 if (runtime == value)
365 break;
366 runtime = value;
367 break;
368 case DL_PERIOD:
369 if (value == period)
370 break;
371 period = value;
372 break;
373 }
374
375 if (runtime > period ||
376 period > fair_server_period_max ||
377 period < fair_server_period_min) {
378 return -EINVAL;
379 }
380
381 if (rq->cfs.h_nr_running) {
382 update_rq_clock(rq);
383 dl_server_stop(&rq->fair_server);
384 }
385
386 retval = dl_server_apply_params(&rq->fair_server, runtime, period, 0);
387 if (retval)
388 cnt = retval;
389
390 if (!runtime)
391 printk_deferred("Fair server disabled in CPU %d, system may crash due to starvation.\n",
392 cpu_of(rq));
393
394 if (rq->cfs.h_nr_running)
395 dl_server_start(&rq->fair_server);
396 }
397
398 *ppos += cnt;
399 return cnt;
400 }
401
402 static size_t sched_fair_server_show(struct seq_file *m, void *v, enum dl_param param)
403 {
404 unsigned long cpu = (unsigned long) m->private;
405 struct rq *rq = cpu_rq(cpu);
406 u64 value;
407
408 switch (param) {
409 case DL_RUNTIME:
410 value = rq->fair_server.dl_runtime;
411 break;
412 case DL_PERIOD:
413 value = rq->fair_server.dl_period;
414 break;
415 }
416
417 seq_printf(m, "%llu\n", value);
418 return 0;
419
420 }
421
422 static ssize_t
423 sched_fair_server_runtime_write(struct file *filp, const char __user *ubuf,
424 size_t cnt, loff_t *ppos)
425 {
426 return sched_fair_server_write(filp, ubuf, cnt, ppos, DL_RUNTIME);
427 }
428
429 static int sched_fair_server_runtime_show(struct seq_file *m, void *v)
430 {
431 return sched_fair_server_show(m, v, DL_RUNTIME);
432 }
433
434 static int sched_fair_server_runtime_open(struct inode *inode, struct file *filp)
435 {
436 return single_open(filp, sched_fair_server_runtime_show, inode->i_private);
437 }
438
439 static const struct file_operations fair_server_runtime_fops = {
440 .open = sched_fair_server_runtime_open,
441 .write = sched_fair_server_runtime_write,
442 .read = seq_read,
443 .llseek = seq_lseek,
444 .release = single_release,
445 };
446
447 static ssize_t
448 sched_fair_server_period_write(struct file *filp, const char __user *ubuf,
449 size_t cnt, loff_t *ppos)
450 {
451 return sched_fair_server_write(filp, ubuf, cnt, ppos, DL_PERIOD);
452 }
453
454 static int sched_fair_server_period_show(struct seq_file *m, void *v)
455 {
456 return sched_fair_server_show(m, v, DL_PERIOD);
457 }
458
459 static int sched_fair_server_period_open(struct inode *inode, struct file *filp)
460 {
461 return single_open(filp, sched_fair_server_period_show, inode->i_private);
462 }
463
464 static const struct file_operations fair_server_period_fops = {
465 .open = sched_fair_server_period_open,
466 .write = sched_fair_server_period_write,
467 .read = seq_read,
468 .llseek = seq_lseek,
469 .release = single_release,
470 };
471
472 static struct dentry *debugfs_sched;
473
474 static void debugfs_fair_server_init(void)
475 {
476 struct dentry *d_fair;
477 unsigned long cpu;
478
479 d_fair = debugfs_create_dir("fair_server", debugfs_sched);
480 if (!d_fair)
481 return;
482
483 for_each_possible_cpu(cpu) {
484 struct dentry *d_cpu;
485 char buf[32];
486
487 snprintf(buf, sizeof(buf), "cpu%lu", cpu);
488 d_cpu = debugfs_create_dir(buf, d_fair);
489
490 debugfs_create_file("runtime", 0644, d_cpu, (void *) cpu, &fair_server_runtime_fops);
491 debugfs_create_file("period", 0644, d_cpu, (void *) cpu, &fair_server_period_fops);
492 }
493 }
494
495 static __init int sched_init_debug(void)
496 {
497 struct dentry __maybe_unused *numa;
498
499 debugfs_sched = debugfs_create_dir("sched", NULL);
500
501 debugfs_create_file("features", 0644, debugfs_sched, NULL, &sched_feat_fops);
502 debugfs_create_file_unsafe("verbose", 0644, debugfs_sched, &sched_debug_verbose, &sched_verbose_fops);
503 #ifdef CONFIG_PREEMPT_DYNAMIC
504 debugfs_create_file("preempt", 0644, debugfs_sched, NULL, &sched_dynamic_fops);
505 #endif
506
507 debugfs_create_u32("base_slice_ns", 0644, debugfs_sched, &sysctl_sched_base_slice);
508
509 debugfs_create_u32("latency_warn_ms", 0644, debugfs_sched, &sysctl_resched_latency_warn_ms);
510 debugfs_create_u32("latency_warn_once", 0644, debugfs_sched, &sysctl_resched_latency_warn_once);
511
512 #ifdef CONFIG_SMP
513 debugfs_create_file("tunable_scaling", 0644, debugfs_sched, NULL, &sched_scaling_fops);
514 debugfs_create_u32("migration_cost_ns", 0644, debugfs_sched, &sysctl_sched_migration_cost);
515 debugfs_create_u32("nr_migrate", 0644, debugfs_sched, &sysctl_sched_nr_migrate);
516
517 mutex_lock(&sched_domains_mutex);
518 update_sched_domain_debugfs();
519 mutex_unlock(&sched_domains_mutex);
520 #endif
521
522 #ifdef CONFIG_NUMA_BALANCING
523 numa = debugfs_create_dir("numa_balancing", debugfs_sched);
524
525 debugfs_create_u32("scan_delay_ms", 0644, numa, &sysctl_numa_balancing_scan_delay);
526 debugfs_create_u32("scan_period_min_ms", 0644, numa, &sysctl_numa_balancing_scan_period_min);
527 debugfs_create_u32("scan_period_max_ms", 0644, numa, &sysctl_numa_balancing_scan_period_max);
528 debugfs_create_u32("scan_size_mb", 0644, numa, &sysctl_numa_balancing_scan_size);
529 debugfs_create_u32("hot_threshold_ms", 0644, numa, &sysctl_numa_balancing_hot_threshold);
530 #endif
531
532 debugfs_create_file("debug", 0444, debugfs_sched, NULL, &sched_debug_fops);
533
534 debugfs_fair_server_init();
535
536 return 0;
537 }
538 late_initcall(sched_init_debug);
539
540 #ifdef CONFIG_SMP
541
542 static cpumask_var_t sd_sysctl_cpus;
543
544 static int sd_flags_show(struct seq_file *m, void *v)
545 {
546 unsigned long flags = *(unsigned int *)m->private;
547 int idx;
548
549 for_each_set_bit(idx, &flags, __SD_FLAG_CNT) {
550 seq_puts(m, sd_flag_debug[idx].name);
551 seq_puts(m, " ");
552 }
553 seq_puts(m, "\n");
554
555 return 0;
556 }
557
558 static int sd_flags_open(struct inode *inode, struct file *file)
559 {
560 return single_open(file, sd_flags_show, inode->i_private);
561 }
562
563 static const struct file_operations sd_flags_fops = {
564 .open = sd_flags_open,
565 .read = seq_read,
566 .llseek = seq_lseek,
567 .release = single_release,
568 };
569
570 static void register_sd(struct sched_domain *sd, struct dentry *parent)
571 {
572 #define SDM(type, mode, member) \
573 debugfs_create_##type(#member, mode, parent, &sd->member)
574
575 SDM(ulong, 0644, min_interval);
576 SDM(ulong, 0644, max_interval);
577 SDM(u64, 0644, max_newidle_lb_cost);
578 SDM(u32, 0644, busy_factor);
579 SDM(u32, 0644, imbalance_pct);
580 SDM(u32, 0644, cache_nice_tries);
581 SDM(str, 0444, name);
582
583 #undef SDM
584
585 debugfs_create_file("flags", 0444, parent, &sd->flags, &sd_flags_fops);
586 debugfs_create_file("groups_flags", 0444, parent, &sd->groups->flags, &sd_flags_fops);
587 debugfs_create_u32("level", 0444, parent, (u32 *)&sd->level);
588 }
589
590 void update_sched_domain_debugfs(void)
591 {
592 int cpu, i;
593
594 /*
595 * This can unfortunately be invoked before sched_debug_init() creates
596 * the debug directory. Don't touch sd_sysctl_cpus until then.
597 */
598 if (!debugfs_sched)
599 return;
600
601 if (!sched_debug_verbose)
602 return;
603
604 if (!cpumask_available(sd_sysctl_cpus)) {
605 if (!alloc_cpumask_var(&sd_sysctl_cpus, GFP_KERNEL))
606 return;
607 cpumask_copy(sd_sysctl_cpus, cpu_possible_mask);
608 }
609
610 if (!sd_dentry) {
611 sd_dentry = debugfs_create_dir("domains", debugfs_sched);
612
613 /* rebuild sd_sysctl_cpus if empty since it gets cleared below */
614 if (cpumask_empty(sd_sysctl_cpus))
615 cpumask_copy(sd_sysctl_cpus, cpu_online_mask);
616 }
617
618 for_each_cpu(cpu, sd_sysctl_cpus) {
619 struct sched_domain *sd;
620 struct dentry *d_cpu;
621 char buf[32];
622
623 snprintf(buf, sizeof(buf), "cpu%d", cpu);
624 debugfs_lookup_and_remove(buf, sd_dentry);
625 d_cpu = debugfs_create_dir(buf, sd_dentry);
626
627 i = 0;
628 for_each_domain(cpu, sd) {
629 struct dentry *d_sd;
630
631 snprintf(buf, sizeof(buf), "domain%d", i);
632 d_sd = debugfs_create_dir(buf, d_cpu);
633
634 register_sd(sd, d_sd);
635 i++;
636 }
637
638 __cpumask_clear_cpu(cpu, sd_sysctl_cpus);
639 }
640 }
641
642 void dirty_sched_domain_sysctl(int cpu)
643 {
644 if (cpumask_available(sd_sysctl_cpus))
645 __cpumask_set_cpu(cpu, sd_sysctl_cpus);
646 }
647
648 #endif /* CONFIG_SMP */
649
650 #ifdef CONFIG_FAIR_GROUP_SCHED
651 static void print_cfs_group_stats(struct seq_file *m, int cpu, struct task_group *tg)
652 {
653 struct sched_entity *se = tg->se[cpu];
654
655 #define P(F) SEQ_printf(m, " .%-30s: %lld\n", #F, (long long)F)
656 #define P_SCHEDSTAT(F) SEQ_printf(m, " .%-30s: %lld\n", \
657 #F, (long long)schedstat_val(stats->F))
658 #define PN(F) SEQ_printf(m, " .%-30s: %lld.%06ld\n", #F, SPLIT_NS((long long)F))
659 #define PN_SCHEDSTAT(F) SEQ_printf(m, " .%-30s: %lld.%06ld\n", \
660 #F, SPLIT_NS((long long)schedstat_val(stats->F)))
661
662 if (!se)
663 return;
664
665 PN(se->exec_start);
666 PN(se->vruntime);
667 PN(se->sum_exec_runtime);
668
669 if (schedstat_enabled()) {
670 struct sched_statistics *stats;
671 stats = __schedstats_from_se(se);
672
673 PN_SCHEDSTAT(wait_start);
674 PN_SCHEDSTAT(sleep_start);
675 PN_SCHEDSTAT(block_start);
676 PN_SCHEDSTAT(sleep_max);
677 PN_SCHEDSTAT(block_max);
678 PN_SCHEDSTAT(exec_max);
679 PN_SCHEDSTAT(slice_max);
680 PN_SCHEDSTAT(wait_max);
681 PN_SCHEDSTAT(wait_sum);
682 P_SCHEDSTAT(wait_count);
683 }
684
685 P(se->load.weight);
686 #ifdef CONFIG_SMP
687 P(se->avg.load_avg);
688 P(se->avg.util_avg);
689 P(se->avg.runnable_avg);
690 #endif
691
692 #undef PN_SCHEDSTAT
693 #undef PN
694 #undef P_SCHEDSTAT
695 #undef P
696 }
697 #endif
698
699 #ifdef CONFIG_CGROUP_SCHED
700 static DEFINE_SPINLOCK(sched_debug_lock);
701 static char group_path[PATH_MAX];
702
703 static void task_group_path(struct task_group *tg, char *path, int plen)
704 {
705 if (autogroup_path(tg, path, plen))
706 return;
707
708 cgroup_path(tg->css.cgroup, path, plen);
709 }
710
711 /*
712 * Only 1 SEQ_printf_task_group_path() caller can use the full length
713 * group_path[] for cgroup path. Other simultaneous callers will have
714 * to use a shorter stack buffer. A "..." suffix is appended at the end
715 * of the stack buffer so that it will show up in case the output length
716 * matches the given buffer size to indicate possible path name truncation.
717 */
718 #define SEQ_printf_task_group_path(m, tg, fmt...) \
719 { \
720 if (spin_trylock(&sched_debug_lock)) { \
721 task_group_path(tg, group_path, sizeof(group_path)); \
722 SEQ_printf(m, fmt, group_path); \
723 spin_unlock(&sched_debug_lock); \
724 } else { \
725 char buf[128]; \
726 char *bufend = buf + sizeof(buf) - 3; \
727 task_group_path(tg, buf, bufend - buf); \
728 strcpy(bufend - 1, "..."); \
729 SEQ_printf(m, fmt, buf); \
730 } \
731 }
732 #endif
733
734 static void
735 print_task(struct seq_file *m, struct rq *rq, struct task_struct *p)
736 {
737 if (task_current(rq, p))
738 SEQ_printf(m, ">R");
739 else
740 SEQ_printf(m, " %c", task_state_to_char(p));
741
742 SEQ_printf(m, " %15s %5d %9Ld.%06ld %c %9Ld.%06ld %c %9Ld.%06ld %9Ld.%06ld %9Ld %5d ",
743 p->comm, task_pid_nr(p),
744 SPLIT_NS(p->se.vruntime),
745 entity_eligible(cfs_rq_of(&p->se), &p->se) ? 'E' : 'N',
746 SPLIT_NS(p->se.deadline),
747 p->se.custom_slice ? 'S' : ' ',
748 SPLIT_NS(p->se.slice),
749 SPLIT_NS(p->se.sum_exec_runtime),
750 (long long)(p->nvcsw + p->nivcsw),
751 p->prio);
752
753 SEQ_printf(m, "%9lld.%06ld %9lld.%06ld %9lld.%06ld",
754 SPLIT_NS(schedstat_val_or_zero(p->stats.wait_sum)),
755 SPLIT_NS(schedstat_val_or_zero(p->stats.sum_sleep_runtime)),
756 SPLIT_NS(schedstat_val_or_zero(p->stats.sum_block_runtime)));
757
758 #ifdef CONFIG_NUMA_BALANCING
759 SEQ_printf(m, " %d %d", task_node(p), task_numa_group_id(p));
760 #endif
761 #ifdef CONFIG_CGROUP_SCHED
762 SEQ_printf_task_group_path(m, task_group(p), " %s")
763 #endif
764
765 SEQ_printf(m, "\n");
766 }
767
768 static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu)
769 {
770 struct task_struct *g, *p;
771
772 SEQ_printf(m, "\n");
773 SEQ_printf(m, "runnable tasks:\n");
774 SEQ_printf(m, " S task PID vruntime eligible "
775 "deadline slice sum-exec switches "
776 "prio wait-time sum-sleep sum-block"
777 #ifdef CONFIG_NUMA_BALANCING
778 " node group-id"
779 #endif
780 #ifdef CONFIG_CGROUP_SCHED
781 " group-path"
782 #endif
783 "\n");
784 SEQ_printf(m, "-------------------------------------------------------"
785 "------------------------------------------------------"
786 "------------------------------------------------------"
787 #ifdef CONFIG_NUMA_BALANCING
788 "--------------"
789 #endif
790 #ifdef CONFIG_CGROUP_SCHED
791 "--------------"
792 #endif
793 "\n");
794
795 rcu_read_lock();
796 for_each_process_thread(g, p) {
797 if (task_cpu(p) != rq_cpu)
798 continue;
799
800 print_task(m, rq, p);
801 }
802 rcu_read_unlock();
803 }
804
805 void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
806 {
807 s64 left_vruntime = -1, min_vruntime, right_vruntime = -1, left_deadline = -1, spread;
808 struct sched_entity *last, *first, *root;
809 struct rq *rq = cpu_rq(cpu);
810 unsigned long flags;
811
812 #ifdef CONFIG_FAIR_GROUP_SCHED
813 SEQ_printf(m, "\n");
814 SEQ_printf_task_group_path(m, cfs_rq->tg, "cfs_rq[%d]:%s\n", cpu);
815 #else
816 SEQ_printf(m, "\n");
817 SEQ_printf(m, "cfs_rq[%d]:\n", cpu);
818 #endif
819
820 raw_spin_rq_lock_irqsave(rq, flags);
821 root = __pick_root_entity(cfs_rq);
822 if (root)
823 left_vruntime = root->min_vruntime;
824 first = __pick_first_entity(cfs_rq);
825 if (first)
826 left_deadline = first->deadline;
827 last = __pick_last_entity(cfs_rq);
828 if (last)
829 right_vruntime = last->vruntime;
830 min_vruntime = cfs_rq->min_vruntime;
831 raw_spin_rq_unlock_irqrestore(rq, flags);
832
833 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "left_deadline",
834 SPLIT_NS(left_deadline));
835 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "left_vruntime",
836 SPLIT_NS(left_vruntime));
837 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "min_vruntime",
838 SPLIT_NS(min_vruntime));
839 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "avg_vruntime",
840 SPLIT_NS(avg_vruntime(cfs_rq)));
841 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "right_vruntime",
842 SPLIT_NS(right_vruntime));
843 spread = right_vruntime - left_vruntime;
844 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "spread", SPLIT_NS(spread));
845 SEQ_printf(m, " .%-30s: %d\n", "nr_running", cfs_rq->nr_running);
846 SEQ_printf(m, " .%-30s: %d\n", "h_nr_running", cfs_rq->h_nr_running);
847 SEQ_printf(m, " .%-30s: %d\n", "idle_nr_running",
848 cfs_rq->idle_nr_running);
849 SEQ_printf(m, " .%-30s: %d\n", "idle_h_nr_running",
850 cfs_rq->idle_h_nr_running);
851 SEQ_printf(m, " .%-30s: %ld\n", "load", cfs_rq->load.weight);
852 #ifdef CONFIG_SMP
853 SEQ_printf(m, " .%-30s: %lu\n", "load_avg",
854 cfs_rq->avg.load_avg);
855 SEQ_printf(m, " .%-30s: %lu\n", "runnable_avg",
856 cfs_rq->avg.runnable_avg);
857 SEQ_printf(m, " .%-30s: %lu\n", "util_avg",
858 cfs_rq->avg.util_avg);
859 SEQ_printf(m, " .%-30s: %u\n", "util_est",
860 cfs_rq->avg.util_est);
861 SEQ_printf(m, " .%-30s: %ld\n", "removed.load_avg",
862 cfs_rq->removed.load_avg);
863 SEQ_printf(m, " .%-30s: %ld\n", "removed.util_avg",
864 cfs_rq->removed.util_avg);
865 SEQ_printf(m, " .%-30s: %ld\n", "removed.runnable_avg",
866 cfs_rq->removed.runnable_avg);
867 #ifdef CONFIG_FAIR_GROUP_SCHED
868 SEQ_printf(m, " .%-30s: %lu\n", "tg_load_avg_contrib",
869 cfs_rq->tg_load_avg_contrib);
870 SEQ_printf(m, " .%-30s: %ld\n", "tg_load_avg",
871 atomic_long_read(&cfs_rq->tg->load_avg));
872 #endif
873 #endif
874 #ifdef CONFIG_CFS_BANDWIDTH
875 SEQ_printf(m, " .%-30s: %d\n", "throttled",
876 cfs_rq->throttled);
877 SEQ_printf(m, " .%-30s: %d\n", "throttle_count",
878 cfs_rq->throttle_count);
879 #endif
880
881 #ifdef CONFIG_FAIR_GROUP_SCHED
882 print_cfs_group_stats(m, cpu, cfs_rq->tg);
883 #endif
884 }
885
886 void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq)
887 {
888 #ifdef CONFIG_RT_GROUP_SCHED
889 SEQ_printf(m, "\n");
890 SEQ_printf_task_group_path(m, rt_rq->tg, "rt_rq[%d]:%s\n", cpu);
891 #else
892 SEQ_printf(m, "\n");
893 SEQ_printf(m, "rt_rq[%d]:\n", cpu);
894 #endif
895
896 #define P(x) \
897 SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rt_rq->x))
898 #define PU(x) \
899 SEQ_printf(m, " .%-30s: %lu\n", #x, (unsigned long)(rt_rq->x))
900 #define PN(x) \
901 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rt_rq->x))
902
903 PU(rt_nr_running);
904
905 #ifdef CONFIG_RT_GROUP_SCHED
906 P(rt_throttled);
907 PN(rt_time);
908 PN(rt_runtime);
909 #endif
910
911 #undef PN
912 #undef PU
913 #undef P
914 }
915
916 void print_dl_rq(struct seq_file *m, int cpu, struct dl_rq *dl_rq)
917 {
918 struct dl_bw *dl_bw;
919
920 SEQ_printf(m, "\n");
921 SEQ_printf(m, "dl_rq[%d]:\n", cpu);
922
923 #define PU(x) \
924 SEQ_printf(m, " .%-30s: %lu\n", #x, (unsigned long)(dl_rq->x))
925
926 PU(dl_nr_running);
927 #ifdef CONFIG_SMP
928 dl_bw = &cpu_rq(cpu)->rd->dl_bw;
929 #else
930 dl_bw = &dl_rq->dl_bw;
931 #endif
932 SEQ_printf(m, " .%-30s: %lld\n", "dl_bw->bw", dl_bw->bw);
933 SEQ_printf(m, " .%-30s: %lld\n", "dl_bw->total_bw", dl_bw->total_bw);
934
935 #undef PU
936 }
937
938 static void print_cpu(struct seq_file *m, int cpu)
939 {
940 struct rq *rq = cpu_rq(cpu);
941
942 #ifdef CONFIG_X86
943 {
944 unsigned int freq = cpu_khz ? : 1;
945
946 SEQ_printf(m, "cpu#%d, %u.%03u MHz\n",
947 cpu, freq / 1000, (freq % 1000));
948 }
949 #else
950 SEQ_printf(m, "cpu#%d\n", cpu);
951 #endif
952
953 #define P(x) \
954 do { \
955 if (sizeof(rq->x) == 4) \
956 SEQ_printf(m, " .%-30s: %d\n", #x, (int)(rq->x)); \
957 else \
958 SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rq->x));\
959 } while (0)
960
961 #define PN(x) \
962 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rq->x))
963
964 P(nr_running);
965 P(nr_switches);
966 P(nr_uninterruptible);
967 PN(next_balance);
968 SEQ_printf(m, " .%-30s: %ld\n", "curr->pid", (long)(task_pid_nr(rq->curr)));
969 PN(clock);
970 PN(clock_task);
971 #undef P
972 #undef PN
973
974 #ifdef CONFIG_SMP
975 #define P64(n) SEQ_printf(m, " .%-30s: %Ld\n", #n, rq->n);
976 P64(avg_idle);
977 P64(max_idle_balance_cost);
978 #undef P64
979 #endif
980
981 #define P(n) SEQ_printf(m, " .%-30s: %d\n", #n, schedstat_val(rq->n));
982 if (schedstat_enabled()) {
983 P(yld_count);
984 P(sched_count);
985 P(sched_goidle);
986 P(ttwu_count);
987 P(ttwu_local);
988 }
989 #undef P
990
991 print_cfs_stats(m, cpu);
992 print_rt_stats(m, cpu);
993 print_dl_stats(m, cpu);
994
995 print_rq(m, rq, cpu);
996 SEQ_printf(m, "\n");
997 }
998
999 static const char *sched_tunable_scaling_names[] = {
1000 "none",
1001 "logarithmic",
1002 "linear"
1003 };
1004
1005 static void sched_debug_header(struct seq_file *m)
1006 {
1007 u64 ktime, sched_clk, cpu_clk;
1008 unsigned long flags;
1009
1010 local_irq_save(flags);
1011 ktime = ktime_to_ns(ktime_get());
1012 sched_clk = sched_clock();
1013 cpu_clk = local_clock();
1014 local_irq_restore(flags);
1015
1016 SEQ_printf(m, "Sched Debug Version: v0.11, %s %.*s\n",
1017 init_utsname()->release,
1018 (int)strcspn(init_utsname()->version, " "),
1019 init_utsname()->version);
1020
1021 #define P(x) \
1022 SEQ_printf(m, "%-40s: %Ld\n", #x, (long long)(x))
1023 #define PN(x) \
1024 SEQ_printf(m, "%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x))
1025 PN(ktime);
1026 PN(sched_clk);
1027 PN(cpu_clk);
1028 P(jiffies);
1029 #ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
1030 P(sched_clock_stable());
1031 #endif
1032 #undef PN
1033 #undef P
1034
1035 SEQ_printf(m, "\n");
1036 SEQ_printf(m, "sysctl_sched\n");
1037
1038 #define P(x) \
1039 SEQ_printf(m, " .%-40s: %Ld\n", #x, (long long)(x))
1040 #define PN(x) \
1041 SEQ_printf(m, " .%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x))
1042 PN(sysctl_sched_base_slice);
1043 P(sysctl_sched_features);
1044 #undef PN
1045 #undef P
1046
1047 SEQ_printf(m, " .%-40s: %d (%s)\n",
1048 "sysctl_sched_tunable_scaling",
1049 sysctl_sched_tunable_scaling,
1050 sched_tunable_scaling_names[sysctl_sched_tunable_scaling]);
1051 SEQ_printf(m, "\n");
1052 }
1053
1054 static int sched_debug_show(struct seq_file *m, void *v)
1055 {
1056 int cpu = (unsigned long)(v - 2);
1057
1058 if (cpu != -1)
1059 print_cpu(m, cpu);
1060 else
1061 sched_debug_header(m);
1062
1063 return 0;
1064 }
1065
1066 void sysrq_sched_debug_show(void)
1067 {
1068 int cpu;
1069
1070 sched_debug_header(NULL);
1071 for_each_online_cpu(cpu) {
1072 /*
1073 * Need to reset softlockup watchdogs on all CPUs, because
1074 * another CPU might be blocked waiting for us to process
1075 * an IPI or stop_machine.
1076 */
1077 touch_nmi_watchdog();
1078 touch_all_softlockup_watchdogs();
1079 print_cpu(NULL, cpu);
1080 }
1081 }
1082
1083 /*
1084 * This iterator needs some explanation.
1085 * It returns 1 for the header position.
1086 * This means 2 is CPU 0.
1087 * In a hotplugged system some CPUs, including CPU 0, may be missing so we have
1088 * to use cpumask_* to iterate over the CPUs.
1089 */
1090 static void *sched_debug_start(struct seq_file *file, loff_t *offset)
1091 {
1092 unsigned long n = *offset;
1093
1094 if (n == 0)
1095 return (void *) 1;
1096
1097 n--;
1098
1099 if (n > 0)
1100 n = cpumask_next(n - 1, cpu_online_mask);
1101 else
1102 n = cpumask_first(cpu_online_mask);
1103
1104 *offset = n + 1;
1105
1106 if (n < nr_cpu_ids)
1107 return (void *)(unsigned long)(n + 2);
1108
1109 return NULL;
1110 }
1111
1112 static void *sched_debug_next(struct seq_file *file, void *data, loff_t *offset)
1113 {
1114 (*offset)++;
1115 return sched_debug_start(file, offset);
1116 }
1117
1118 static void sched_debug_stop(struct seq_file *file, void *data)
1119 {
1120 }
1121
1122 static const struct seq_operations sched_debug_sops = {
1123 .start = sched_debug_start,
1124 .next = sched_debug_next,
1125 .stop = sched_debug_stop,
1126 .show = sched_debug_show,
1127 };
1128
1129 #define __PS(S, F) SEQ_printf(m, "%-45s:%21Ld\n", S, (long long)(F))
1130 #define __P(F) __PS(#F, F)
1131 #define P(F) __PS(#F, p->F)
1132 #define PM(F, M) __PS(#F, p->F & (M))
1133 #define __PSN(S, F) SEQ_printf(m, "%-45s:%14Ld.%06ld\n", S, SPLIT_NS((long long)(F)))
1134 #define __PN(F) __PSN(#F, F)
1135 #define PN(F) __PSN(#F, p->F)
1136
1137
1138 #ifdef CONFIG_NUMA_BALANCING
1139 void print_numa_stats(struct seq_file *m, int node, unsigned long tsf,
1140 unsigned long tpf, unsigned long gsf, unsigned long gpf)
1141 {
1142 SEQ_printf(m, "numa_faults node=%d ", node);
1143 SEQ_printf(m, "task_private=%lu task_shared=%lu ", tpf, tsf);
1144 SEQ_printf(m, "group_private=%lu group_shared=%lu\n", gpf, gsf);
1145 }
1146 #endif
1147
1148
1149 static void sched_show_numa(struct task_struct *p, struct seq_file *m)
1150 {
1151 #ifdef CONFIG_NUMA_BALANCING
1152 if (p->mm)
1153 P(mm->numa_scan_seq);
1154
1155 P(numa_pages_migrated);
1156 P(numa_preferred_nid);
1157 P(total_numa_faults);
1158 SEQ_printf(m, "current_node=%d, numa_group_id=%d\n",
1159 task_node(p), task_numa_group_id(p));
1160 show_numa_stats(p, m);
1161 #endif
1162 }
1163
1164 void proc_sched_show_task(struct task_struct *p, struct pid_namespace *ns,
1165 struct seq_file *m)
1166 {
1167 unsigned long nr_switches;
1168
1169 SEQ_printf(m, "%s (%d, #threads: %d)\n", p->comm, task_pid_nr_ns(p, ns),
1170 get_nr_threads(p));
1171 SEQ_printf(m,
1172 "---------------------------------------------------------"
1173 "----------\n");
1174
1175 #define P_SCHEDSTAT(F) __PS(#F, schedstat_val(p->stats.F))
1176 #define PN_SCHEDSTAT(F) __PSN(#F, schedstat_val(p->stats.F))
1177
1178 PN(se.exec_start);
1179 PN(se.vruntime);
1180 PN(se.sum_exec_runtime);
1181
1182 nr_switches = p->nvcsw + p->nivcsw;
1183
1184 P(se.nr_migrations);
1185
1186 if (schedstat_enabled()) {
1187 u64 avg_atom, avg_per_cpu;
1188
1189 PN_SCHEDSTAT(sum_sleep_runtime);
1190 PN_SCHEDSTAT(sum_block_runtime);
1191 PN_SCHEDSTAT(wait_start);
1192 PN_SCHEDSTAT(sleep_start);
1193 PN_SCHEDSTAT(block_start);
1194 PN_SCHEDSTAT(sleep_max);
1195 PN_SCHEDSTAT(block_max);
1196 PN_SCHEDSTAT(exec_max);
1197 PN_SCHEDSTAT(slice_max);
1198 PN_SCHEDSTAT(wait_max);
1199 PN_SCHEDSTAT(wait_sum);
1200 P_SCHEDSTAT(wait_count);
1201 PN_SCHEDSTAT(iowait_sum);
1202 P_SCHEDSTAT(iowait_count);
1203 P_SCHEDSTAT(nr_migrations_cold);
1204 P_SCHEDSTAT(nr_failed_migrations_affine);
1205 P_SCHEDSTAT(nr_failed_migrations_running);
1206 P_SCHEDSTAT(nr_failed_migrations_hot);
1207 P_SCHEDSTAT(nr_forced_migrations);
1208 P_SCHEDSTAT(nr_wakeups);
1209 P_SCHEDSTAT(nr_wakeups_sync);
1210 P_SCHEDSTAT(nr_wakeups_migrate);
1211 P_SCHEDSTAT(nr_wakeups_local);
1212 P_SCHEDSTAT(nr_wakeups_remote);
1213 P_SCHEDSTAT(nr_wakeups_affine);
1214 P_SCHEDSTAT(nr_wakeups_affine_attempts);
1215 P_SCHEDSTAT(nr_wakeups_passive);
1216 P_SCHEDSTAT(nr_wakeups_idle);
1217
1218 avg_atom = p->se.sum_exec_runtime;
1219 if (nr_switches)
1220 avg_atom = div64_ul(avg_atom, nr_switches);
1221 else
1222 avg_atom = -1LL;
1223
1224 avg_per_cpu = p->se.sum_exec_runtime;
1225 if (p->se.nr_migrations) {
1226 avg_per_cpu = div64_u64(avg_per_cpu,
1227 p->se.nr_migrations);
1228 } else {
1229 avg_per_cpu = -1LL;
1230 }
1231
1232 __PN(avg_atom);
1233 __PN(avg_per_cpu);
1234
1235 #ifdef CONFIG_SCHED_CORE
1236 PN_SCHEDSTAT(core_forceidle_sum);
1237 #endif
1238 }
1239
1240 __P(nr_switches);
1241 __PS("nr_voluntary_switches", p->nvcsw);
1242 __PS("nr_involuntary_switches", p->nivcsw);
1243
1244 P(se.load.weight);
1245 #ifdef CONFIG_SMP
1246 P(se.avg.load_sum);
1247 P(se.avg.runnable_sum);
1248 P(se.avg.util_sum);
1249 P(se.avg.load_avg);
1250 P(se.avg.runnable_avg);
1251 P(se.avg.util_avg);
1252 P(se.avg.last_update_time);
1253 PM(se.avg.util_est, ~UTIL_AVG_UNCHANGED);
1254 #endif
1255 #ifdef CONFIG_UCLAMP_TASK
1256 __PS("uclamp.min", p->uclamp_req[UCLAMP_MIN].value);
1257 __PS("uclamp.max", p->uclamp_req[UCLAMP_MAX].value);
1258 __PS("effective uclamp.min", uclamp_eff_value(p, UCLAMP_MIN));
1259 __PS("effective uclamp.max", uclamp_eff_value(p, UCLAMP_MAX));
1260 #endif
1261 P(policy);
1262 P(prio);
1263 if (task_has_dl_policy(p)) {
1264 P(dl.runtime);
1265 P(dl.deadline);
1266 }
1267 #ifdef CONFIG_SCHED_CLASS_EXT
1268 __PS("ext.enabled", task_on_scx(p));
1269 #endif
1270 #undef PN_SCHEDSTAT
1271 #undef P_SCHEDSTAT
1272
1273 {
1274 unsigned int this_cpu = raw_smp_processor_id();
1275 u64 t0, t1;
1276
1277 t0 = cpu_clock(this_cpu);
1278 t1 = cpu_clock(this_cpu);
1279 __PS("clock-delta", t1-t0);
1280 }
1281
1282 sched_show_numa(p, m);
1283 }
1284
1285 void proc_sched_set_task(struct task_struct *p)
1286 {
1287 #ifdef CONFIG_SCHEDSTATS
1288 memset(&p->stats, 0, sizeof(p->stats));
1289 #endif
1290 }
1291
1292 void resched_latency_warn(int cpu, u64 latency)
1293 {
1294 static DEFINE_RATELIMIT_STATE(latency_check_ratelimit, 60 * 60 * HZ, 1);
1295
1296 WARN(__ratelimit(&latency_check_ratelimit),
1297 "sched: CPU %d need_resched set for > %llu ns (%d ticks) "
1298 "without schedule\n",
1299 cpu, latency, cpu_rq(cpu)->ticks_without_resched);
1300 }
Kernel DRM miscellaneous fixes and cross-tree changes