projects/linux·blob v7.2 · refs

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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#include <linux/debugfs.h>
10#include <linux/nmi.h>
11#include <linux/log2.h>
12#include "sched.h"
13
14/*
15 * This allows printing both to /sys/kernel/debug/sched/debug and
16 * to the console
17 */
18#define SEQ_printf(m, x...) \
19 do { \
20 if (m) \
21 seq_printf(m, x); \
22 else \
23 pr_cont(x); \
24 } while (0)
25
26/*
27 * Ease the printing of nsec fields:
28 */
29static long long nsec_high(unsigned long long nsec)
30{
31 if ((long long)nsec < 0) {
32 nsec = -nsec;
33 do_div(nsec, 1000000);
34 return -nsec;
35 }
36 do_div(nsec, 1000000);
37
38 return nsec;
39}
40
41static unsigned long nsec_low(unsigned long long nsec)
42{
43 if ((long long)nsec < 0)
44 nsec = -nsec;
45
46 return do_div(nsec, 1000000);
47}
48
49#define SPLIT_NS(x) nsec_high(x), nsec_low(x)
50
51#define SCHED_FEAT(name, enabled) \
52 #name ,
53
54static const char * const sched_feat_names[] = {
55#include "features.h"
56};
57
58#undef SCHED_FEAT
59
60static int sched_feat_show(struct seq_file *m, void *v)
61{
62 int i;
63
64 for (i = 0; i < __SCHED_FEAT_NR; i++) {
65 if (!(sysctl_sched_features & (1UL << i)))
66 seq_puts(m, "NO_");
67 seq_printf(m, "%s ", sched_feat_names[i]);
68 }
69 seq_puts(m, "\n");
70
71 return 0;
72}
73
74#ifdef CONFIG_JUMP_LABEL
75
76#define jump_label_key__true STATIC_KEY_INIT_TRUE
77#define jump_label_key__false STATIC_KEY_INIT_FALSE
78
79#define SCHED_FEAT(name, enabled) \
80 jump_label_key__##enabled ,
81
82struct static_key sched_feat_keys[__SCHED_FEAT_NR] = {
83#include "features.h"
84};
85
86#undef SCHED_FEAT
87
88static void sched_feat_disable(int i)
89{
90 static_key_disable_cpuslocked(&sched_feat_keys[i]);
91}
92
93static void sched_feat_enable(int i)
94{
95 static_key_enable_cpuslocked(&sched_feat_keys[i]);
96}
97#else /* !CONFIG_JUMP_LABEL: */
98static void sched_feat_disable(int i) { };
99static void sched_feat_enable(int i) { };
100#endif /* !CONFIG_JUMP_LABEL */
101
102static int sched_feat_set(char *cmp)
103{
104 int i;
105 int neg = 0;
106
107 if (strncmp(cmp, "NO_", 3) == 0) {
108 neg = 1;
109 cmp += 3;
110 }
111
112 i = match_string(sched_feat_names, __SCHED_FEAT_NR, cmp);
113 if (i < 0)
114 return i;
115
116 if (neg) {
117 sysctl_sched_features &= ~(1UL << i);
118 sched_feat_disable(i);
119 } else {
120 sysctl_sched_features |= (1UL << i);
121 sched_feat_enable(i);
122 }
123
124 return 0;
125}
126
127static ssize_t
128sched_feat_write(struct file *filp, const char __user *ubuf,
129 size_t cnt, loff_t *ppos)
130{
131 char buf[64];
132 char *cmp;
133 int ret;
134 struct inode *inode;
135
136 if (cnt > 63)
137 cnt = 63;
138
139 if (copy_from_user(buf, ubuf, cnt))
140 return -EFAULT;
141
142 buf[cnt] = 0;
143 cmp = strstrip(buf);
144
145 /* Ensure the static_key remains in a consistent state */
146 inode = file_inode(filp);
147 cpus_read_lock();
148 inode_lock(inode);
149 ret = sched_feat_set(cmp);
150 inode_unlock(inode);
151 cpus_read_unlock();
152 if (ret < 0)
153 return ret;
154
155 *ppos += cnt;
156
157 return cnt;
158}
159
160static int sched_feat_open(struct inode *inode, struct file *filp)
161{
162 return single_open(filp, sched_feat_show, NULL);
163}
164
165static const struct file_operations sched_feat_fops = {
166 .open = sched_feat_open,
167 .write = sched_feat_write,
168 .read = seq_read,
169 .llseek = seq_lseek,
170 .release = single_release,
171};
172
173static ssize_t sched_scaling_write(struct file *filp, const char __user *ubuf,
174 size_t cnt, loff_t *ppos)
175{
176 unsigned int scaling;
177 int ret;
178
179 ret = kstrtouint_from_user(ubuf, cnt, 10, &scaling);
180 if (ret)
181 return ret;
182
183 if (scaling >= SCHED_TUNABLESCALING_END)
184 return -EINVAL;
185
186 sysctl_sched_tunable_scaling = scaling;
187 if (sched_update_scaling())
188 return -EINVAL;
189
190 *ppos += cnt;
191 return cnt;
192}
193
194static int sched_scaling_show(struct seq_file *m, void *v)
195{
196 seq_printf(m, "%d\n", sysctl_sched_tunable_scaling);
197 return 0;
198}
199
200static int sched_scaling_open(struct inode *inode, struct file *filp)
201{
202 return single_open(filp, sched_scaling_show, NULL);
203}
204
205static const struct file_operations sched_scaling_fops = {
206 .open = sched_scaling_open,
207 .write = sched_scaling_write,
208 .read = seq_read,
209 .llseek = seq_lseek,
210 .release = single_release,
211};
212
213#ifdef CONFIG_SCHED_CACHE
214static ssize_t
215sched_cache_enable_write(struct file *filp, const char __user *ubuf,
216 size_t cnt, loff_t *ppos)
217{
218 bool val;
219 int ret;
220
221 ret = kstrtobool_from_user(ubuf, cnt, &val);
222 if (ret)
223 return ret;
224
225 sysctl_sched_cache_user = val;
226
227 sched_cache_active_set();
228
229 *ppos += cnt;
230
231 return cnt;
232}
233
234static int sched_cache_enable_show(struct seq_file *m, void *v)
235{
236 seq_printf(m, "%d\n", sysctl_sched_cache_user);
237 return 0;
238}
239
240static int sched_cache_enable_open(struct inode *inode,
241 struct file *filp)
242{
243 return single_open(filp, sched_cache_enable_show, NULL);
244}
245
246static const struct file_operations sched_cache_enable_fops = {
247 .open = sched_cache_enable_open,
248 .write = sched_cache_enable_write,
249 .read = seq_read,
250 .llseek = seq_lseek,
251 .release = single_release,
252};
253#endif
254
255#ifdef CONFIG_PREEMPT_DYNAMIC
256
257static ssize_t sched_dynamic_write(struct file *filp, const char __user *ubuf,
258 size_t cnt, loff_t *ppos)
259{
260 char buf[16];
261 int mode;
262
263 if (cnt > 15)
264 cnt = 15;
265
266 if (copy_from_user(buf, ubuf, cnt))
267 return -EFAULT;
268
269 buf[cnt] = 0;
270 mode = sched_dynamic_mode(strstrip(buf));
271 if (mode < 0)
272 return mode;
273
274 sched_dynamic_update(mode);
275
276 *ppos += cnt;
277
278 return cnt;
279}
280
281static int sched_dynamic_show(struct seq_file *m, void *v)
282{
283 int i = (IS_ENABLED(CONFIG_PREEMPT_RT) || IS_ENABLED(CONFIG_ARCH_HAS_PREEMPT_LAZY)) * 2;
284 int mode = READ_ONCE(preempt_dynamic_mode);
285 int j;
286
287 /* Count entries in NULL terminated preempt_modes */
288 for (j = 0; preempt_modes[j]; j++)
289 ;
290 j -= !IS_ENABLED(CONFIG_ARCH_HAS_PREEMPT_LAZY);
291
292 for (; i < j; i++) {
293 if (mode == i)
294 seq_puts(m, "(");
295 seq_puts(m, preempt_modes[i]);
296 if (mode == i)
297 seq_puts(m, ")");
298
299 seq_puts(m, " ");
300 }
301
302 seq_puts(m, "\n");
303 return 0;
304}
305
306static int sched_dynamic_open(struct inode *inode, struct file *filp)
307{
308 return single_open(filp, sched_dynamic_show, NULL);
309}
310
311static const struct file_operations sched_dynamic_fops = {
312 .open = sched_dynamic_open,
313 .write = sched_dynamic_write,
314 .read = seq_read,
315 .llseek = seq_lseek,
316 .release = single_release,
317};
318
319#endif /* CONFIG_PREEMPT_DYNAMIC */
320
321__read_mostly bool sched_debug_verbose;
322
323static struct dentry *sd_dentry;
324
325
326static ssize_t sched_verbose_write(struct file *filp, const char __user *ubuf,
327 size_t cnt, loff_t *ppos)
328{
329 ssize_t result;
330 bool orig;
331
332 cpus_read_lock();
333 sched_domains_mutex_lock();
334
335 orig = sched_debug_verbose;
336 result = debugfs_write_file_bool(filp, ubuf, cnt, ppos);
337
338 if (sched_debug_verbose && !orig)
339 update_sched_domain_debugfs();
340 else if (!sched_debug_verbose && orig) {
341 debugfs_remove(sd_dentry);
342 sd_dentry = NULL;
343 }
344
345 sched_domains_mutex_unlock();
346 cpus_read_unlock();
347
348 return result;
349}
350
351static const struct file_operations sched_verbose_fops = {
352 .read = debugfs_read_file_bool,
353 .write = sched_verbose_write,
354 .open = simple_open,
355 .llseek = default_llseek,
356};
357
358static const struct seq_operations sched_debug_sops;
359
360static int sched_debug_open(struct inode *inode, struct file *filp)
361{
362 return seq_open(filp, &sched_debug_sops);
363}
364
365static const struct file_operations sched_debug_fops = {
366 .open = sched_debug_open,
367 .read = seq_read,
368 .llseek = seq_lseek,
369 .release = seq_release,
370};
371
372enum dl_param {
373 DL_RUNTIME = 0,
374 DL_PERIOD,
375};
376
377static unsigned long dl_server_period_max = (1UL << 22) * NSEC_PER_USEC; /* ~4 seconds */
378static unsigned long dl_server_period_min = (100) * NSEC_PER_USEC; /* 100 us */
379
380static ssize_t sched_server_write_common(struct file *filp, const char __user *ubuf,
381 size_t cnt, loff_t *ppos, enum dl_param param,
382 void *server)
383{
384 long cpu = (long) ((struct seq_file *) filp->private_data)->private;
385 struct sched_dl_entity *dl_se = (struct sched_dl_entity *)server;
386 u64 old_runtime, runtime, period;
387 struct rq *rq = cpu_rq(cpu);
388 int retval = 0;
389 size_t err;
390 u64 value;
391
392 err = kstrtoull_from_user(ubuf, cnt, 10, &value);
393 if (err)
394 return err;
395
396 scoped_guard (rq_lock_irqsave, rq) {
397 old_runtime = runtime = dl_se->dl_runtime;
398 period = dl_se->dl_period;
399
400 switch (param) {
401 case DL_RUNTIME:
402 if (runtime == value)
403 break;
404 runtime = value;
405 break;
406 case DL_PERIOD:
407 if (value == period)
408 break;
409 period = value;
410 break;
411 }
412
413 if (runtime > period ||
414 period > dl_server_period_max ||
415 period < dl_server_period_min) {
416 return -EINVAL;
417 }
418
419 if (!cpu_online(cpu_of(rq)))
420 return -EBUSY;
421
422 update_rq_clock(rq);
423 dl_server_stop(dl_se);
424 retval = dl_server_apply_params(dl_se, runtime, period, 0);
425 dl_server_start(dl_se);
426
427 if (retval < 0)
428 return retval;
429 }
430
431 if (!!old_runtime ^ !!runtime) {
432 pr_info("%s server %sabled on CPU %d%s.\n",
433 server == &rq->fair_server ? "Fair" : "Ext",
434 runtime ? "en" : "dis",
435 cpu_of(rq),
436 runtime ? "" : ", system may malfunction due to starvation");
437 }
438
439 *ppos += cnt;
440 return cnt;
441}
442
443static size_t sched_server_show_common(struct seq_file *m, void *v, enum dl_param param,
444 void *server)
445{
446 struct sched_dl_entity *dl_se = (struct sched_dl_entity *)server;
447 u64 value;
448
449 switch (param) {
450 case DL_RUNTIME:
451 value = dl_se->dl_runtime;
452 break;
453 case DL_PERIOD:
454 value = dl_se->dl_period;
455 break;
456 }
457
458 seq_printf(m, "%llu\n", value);
459 return 0;
460}
461
462static ssize_t
463sched_fair_server_runtime_write(struct file *filp, const char __user *ubuf,
464 size_t cnt, loff_t *ppos)
465{
466 long cpu = (long) ((struct seq_file *) filp->private_data)->private;
467 struct rq *rq = cpu_rq(cpu);
468
469 return sched_server_write_common(filp, ubuf, cnt, ppos, DL_RUNTIME,
470 &rq->fair_server);
471}
472
473static int sched_fair_server_runtime_show(struct seq_file *m, void *v)
474{
475 unsigned long cpu = (unsigned long) m->private;
476 struct rq *rq = cpu_rq(cpu);
477
478 return sched_server_show_common(m, v, DL_RUNTIME, &rq->fair_server);
479}
480
481static int sched_fair_server_runtime_open(struct inode *inode, struct file *filp)
482{
483 return single_open(filp, sched_fair_server_runtime_show, inode->i_private);
484}
485
486static const struct file_operations fair_server_runtime_fops = {
487 .open = sched_fair_server_runtime_open,
488 .write = sched_fair_server_runtime_write,
489 .read = seq_read,
490 .llseek = seq_lseek,
491 .release = single_release,
492};
493
494static struct dentry *debugfs_sched;
495
496#ifdef CONFIG_SCHED_CLASS_EXT
497static ssize_t
498sched_ext_server_runtime_write(struct file *filp, const char __user *ubuf,
499 size_t cnt, loff_t *ppos)
500{
501 long cpu = (long) ((struct seq_file *) filp->private_data)->private;
502 struct rq *rq = cpu_rq(cpu);
503
504 return sched_server_write_common(filp, ubuf, cnt, ppos, DL_RUNTIME,
505 &rq->ext_server);
506}
507
508static int sched_ext_server_runtime_show(struct seq_file *m, void *v)
509{
510 unsigned long cpu = (unsigned long) m->private;
511 struct rq *rq = cpu_rq(cpu);
512
513 return sched_server_show_common(m, v, DL_RUNTIME, &rq->ext_server);
514}
515
516static int sched_ext_server_runtime_open(struct inode *inode, struct file *filp)
517{
518 return single_open(filp, sched_ext_server_runtime_show, inode->i_private);
519}
520
521static const struct file_operations ext_server_runtime_fops = {
522 .open = sched_ext_server_runtime_open,
523 .write = sched_ext_server_runtime_write,
524 .read = seq_read,
525 .llseek = seq_lseek,
526 .release = single_release,
527};
528
529static ssize_t
530sched_ext_server_period_write(struct file *filp, const char __user *ubuf,
531 size_t cnt, loff_t *ppos)
532{
533 long cpu = (long) ((struct seq_file *) filp->private_data)->private;
534 struct rq *rq = cpu_rq(cpu);
535
536 return sched_server_write_common(filp, ubuf, cnt, ppos, DL_PERIOD,
537 &rq->ext_server);
538}
539
540static int sched_ext_server_period_show(struct seq_file *m, void *v)
541{
542 unsigned long cpu = (unsigned long) m->private;
543 struct rq *rq = cpu_rq(cpu);
544
545 return sched_server_show_common(m, v, DL_PERIOD, &rq->ext_server);
546}
547
548static int sched_ext_server_period_open(struct inode *inode, struct file *filp)
549{
550 return single_open(filp, sched_ext_server_period_show, inode->i_private);
551}
552
553static const struct file_operations ext_server_period_fops = {
554 .open = sched_ext_server_period_open,
555 .write = sched_ext_server_period_write,
556 .read = seq_read,
557 .llseek = seq_lseek,
558 .release = single_release,
559};
560
561static void debugfs_ext_server_init(void)
562{
563 struct dentry *d_ext;
564 unsigned long cpu;
565
566 d_ext = debugfs_create_dir("ext_server", debugfs_sched);
567 if (!d_ext)
568 return;
569
570 for_each_possible_cpu(cpu) {
571 struct dentry *d_cpu;
572 char buf[32];
573
574 snprintf(buf, sizeof(buf), "cpu%lu", cpu);
575 d_cpu = debugfs_create_dir(buf, d_ext);
576
577 debugfs_create_file("runtime", 0644, d_cpu, (void *) cpu, &ext_server_runtime_fops);
578 debugfs_create_file("period", 0644, d_cpu, (void *) cpu, &ext_server_period_fops);
579 }
580}
581#endif /* CONFIG_SCHED_CLASS_EXT */
582
583static ssize_t
584sched_fair_server_period_write(struct file *filp, const char __user *ubuf,
585 size_t cnt, loff_t *ppos)
586{
587 long cpu = (long) ((struct seq_file *) filp->private_data)->private;
588 struct rq *rq = cpu_rq(cpu);
589
590 return sched_server_write_common(filp, ubuf, cnt, ppos, DL_PERIOD,
591 &rq->fair_server);
592}
593
594static int sched_fair_server_period_show(struct seq_file *m, void *v)
595{
596 unsigned long cpu = (unsigned long) m->private;
597 struct rq *rq = cpu_rq(cpu);
598
599 return sched_server_show_common(m, v, DL_PERIOD, &rq->fair_server);
600}
601
602static int sched_fair_server_period_open(struct inode *inode, struct file *filp)
603{
604 return single_open(filp, sched_fair_server_period_show, inode->i_private);
605}
606
607static const struct file_operations fair_server_period_fops = {
608 .open = sched_fair_server_period_open,
609 .write = sched_fair_server_period_write,
610 .read = seq_read,
611 .llseek = seq_lseek,
612 .release = single_release,
613};
614
615static void debugfs_fair_server_init(void)
616{
617 struct dentry *d_fair;
618 unsigned long cpu;
619
620 d_fair = debugfs_create_dir("fair_server", debugfs_sched);
621 if (!d_fair)
622 return;
623
624 for_each_possible_cpu(cpu) {
625 struct dentry *d_cpu;
626 char buf[32];
627
628 snprintf(buf, sizeof(buf), "cpu%lu", cpu);
629 d_cpu = debugfs_create_dir(buf, d_fair);
630
631 debugfs_create_file("runtime", 0644, d_cpu, (void *) cpu, &fair_server_runtime_fops);
632 debugfs_create_file("period", 0644, d_cpu, (void *) cpu, &fair_server_period_fops);
633 }
634}
635
636static __init int sched_init_debug(void)
637{
638 struct dentry __maybe_unused *numa, *llc;
639
640 debugfs_sched = debugfs_create_dir("sched", NULL);
641
642 debugfs_create_file("features", 0644, debugfs_sched, NULL, &sched_feat_fops);
643 debugfs_create_file_unsafe("verbose", 0644, debugfs_sched, &sched_debug_verbose, &sched_verbose_fops);
644#ifdef CONFIG_PREEMPT_DYNAMIC
645 debugfs_create_file("preempt", 0644, debugfs_sched, NULL, &sched_dynamic_fops);
646#endif
647
648 debugfs_create_u32("base_slice_ns", 0644, debugfs_sched, &sysctl_sched_base_slice);
649
650 debugfs_create_u32("latency_warn_ms", 0644, debugfs_sched, &sysctl_resched_latency_warn_ms);
651 debugfs_create_u32("latency_warn_once", 0644, debugfs_sched, &sysctl_resched_latency_warn_once);
652
653 debugfs_create_file("tunable_scaling", 0644, debugfs_sched, NULL, &sched_scaling_fops);
654 debugfs_create_u32("migration_cost_ns", 0644, debugfs_sched, &sysctl_sched_migration_cost);
655 debugfs_create_u32("nr_migrate", 0644, debugfs_sched, &sysctl_sched_nr_migrate);
656
657 sched_domains_mutex_lock();
658 update_sched_domain_debugfs();
659 sched_domains_mutex_unlock();
660
661#ifdef CONFIG_NUMA_BALANCING
662 numa = debugfs_create_dir("numa_balancing", debugfs_sched);
663
664 debugfs_create_u32("scan_delay_ms", 0644, numa, &sysctl_numa_balancing_scan_delay);
665 debugfs_create_u32("scan_period_min_ms", 0644, numa, &sysctl_numa_balancing_scan_period_min);
666 debugfs_create_u32("scan_period_max_ms", 0644, numa, &sysctl_numa_balancing_scan_period_max);
667 debugfs_create_u32("scan_size_mb", 0644, numa, &sysctl_numa_balancing_scan_size);
668 debugfs_create_u32("hot_threshold_ms", 0644, numa, &sysctl_numa_balancing_hot_threshold);
669#endif /* CONFIG_NUMA_BALANCING */
670
671#ifdef CONFIG_SCHED_CACHE
672 llc = debugfs_create_dir("llc_balancing", debugfs_sched);
673 debugfs_create_file("enabled", 0644, llc, NULL,
674 &sched_cache_enable_fops);
675 debugfs_create_u32("aggr_tolerance", 0644, llc,
676 &llc_aggr_tolerance);
677 debugfs_create_u32("epoch_period", 0644, llc,
678 &llc_epoch_period);
679 debugfs_create_u32("epoch_affinity_timeout", 0644, llc,
680 &llc_epoch_affinity_timeout);
681 debugfs_create_u32("overaggr_pct", 0644, llc,
682 &llc_overaggr_pct);
683 debugfs_create_u32("imb_pct", 0644, llc,
684 &llc_imb_pct);
685#endif
686
687 debugfs_create_file("debug", 0444, debugfs_sched, NULL, &sched_debug_fops);
688
689 debugfs_fair_server_init();
690#ifdef CONFIG_SCHED_CLASS_EXT
691 debugfs_ext_server_init();
692#endif
693
694 return 0;
695}
696late_initcall(sched_init_debug);
697
698static cpumask_var_t sd_sysctl_cpus;
699
700static int sd_flags_show(struct seq_file *m, void *v)
701{
702 unsigned long flags = *(unsigned int *)m->private;
703 int idx;
704
705 for_each_set_bit(idx, &flags, __SD_FLAG_CNT) {
706 seq_puts(m, sd_flag_debug[idx].name);
707 seq_puts(m, " ");
708 }
709 seq_puts(m, "\n");
710
711 return 0;
712}
713
714static int sd_flags_open(struct inode *inode, struct file *file)
715{
716 return single_open(file, sd_flags_show, inode->i_private);
717}
718
719static const struct file_operations sd_flags_fops = {
720 .open = sd_flags_open,
721 .read = seq_read,
722 .llseek = seq_lseek,
723 .release = single_release,
724};
725
726static void register_sd(struct sched_domain *sd, struct dentry *parent)
727{
728#define SDM(type, mode, member) \
729 debugfs_create_##type(#member, mode, parent, &sd->member)
730
731 SDM(ulong, 0644, min_interval);
732 SDM(ulong, 0644, max_interval);
733 SDM(u64, 0644, max_newidle_lb_cost);
734 SDM(u32, 0644, busy_factor);
735 SDM(u32, 0644, imbalance_pct);
736 SDM(u32, 0644, cache_nice_tries);
737 SDM(str, 0444, name);
738
739#undef SDM
740
741 debugfs_create_file("flags", 0444, parent, &sd->flags, &sd_flags_fops);
742 debugfs_create_file("groups_flags", 0444, parent, &sd->groups->flags, &sd_flags_fops);
743 debugfs_create_u32("level", 0444, parent, (u32 *)&sd->level);
744
745 if (sd->flags & SD_ASYM_PACKING)
746 debugfs_create_u32("group_asym_prefer_cpu", 0444, parent,
747 (u32 *)&sd->groups->asym_prefer_cpu);
748}
749
750void update_sched_domain_debugfs(void)
751{
752 int cpu, i;
753
754 /*
755 * This can unfortunately be invoked before sched_debug_init() creates
756 * the debug directory. Don't touch sd_sysctl_cpus until then.
757 */
758 if (!debugfs_sched)
759 return;
760
761 if (!sched_debug_verbose)
762 return;
763
764 if (!cpumask_available(sd_sysctl_cpus)) {
765 if (!alloc_cpumask_var(&sd_sysctl_cpus, GFP_KERNEL))
766 return;
767 cpumask_copy(sd_sysctl_cpus, cpu_possible_mask);
768 }
769
770 if (!sd_dentry) {
771 sd_dentry = debugfs_create_dir("domains", debugfs_sched);
772
773 /* rebuild sd_sysctl_cpus if empty since it gets cleared below */
774 if (cpumask_empty(sd_sysctl_cpus))
775 cpumask_copy(sd_sysctl_cpus, cpu_online_mask);
776 }
777
778 for_each_cpu(cpu, sd_sysctl_cpus) {
779 struct sched_domain *sd;
780 struct dentry *d_cpu;
781 char buf[32];
782
783 snprintf(buf, sizeof(buf), "cpu%d", cpu);
784 debugfs_lookup_and_remove(buf, sd_dentry);
785 d_cpu = debugfs_create_dir(buf, sd_dentry);
786
787 i = 0;
788 for_each_domain(cpu, sd) {
789 struct dentry *d_sd;
790
791 snprintf(buf, sizeof(buf), "domain%d", i);
792 d_sd = debugfs_create_dir(buf, d_cpu);
793
794 register_sd(sd, d_sd);
795 i++;
796 }
797
798 __cpumask_clear_cpu(cpu, sd_sysctl_cpus);
799 }
800}
801
802void dirty_sched_domain_sysctl(int cpu)
803{
804 if (cpumask_available(sd_sysctl_cpus))
805 __cpumask_set_cpu(cpu, sd_sysctl_cpus);
806}
807
808#ifdef CONFIG_FAIR_GROUP_SCHED
809static void print_cfs_group_stats(struct seq_file *m, int cpu, struct task_group *tg)
810{
811 struct sched_entity *se = tg_se(tg, cpu);
812
813#define P(F) SEQ_printf(m, " .%-30s: %lld\n", #F, (long long)F)
814#define P_SCHEDSTAT(F) SEQ_printf(m, " .%-30s: %lld\n", \
815 #F, (long long)schedstat_val(stats->F))
816#define PN(F) SEQ_printf(m, " .%-30s: %lld.%06ld\n", #F, SPLIT_NS((long long)F))
817#define PN_SCHEDSTAT(F) SEQ_printf(m, " .%-30s: %lld.%06ld\n", \
818 #F, SPLIT_NS((long long)schedstat_val(stats->F)))
819
820 if (!se)
821 return;
822
823 PN(se->exec_start);
824 PN(se->vruntime);
825 PN(se->sum_exec_runtime);
826
827 if (schedstat_enabled()) {
828 struct sched_statistics *stats;
829 stats = __schedstats_from_se(se);
830
831 PN_SCHEDSTAT(wait_start);
832 PN_SCHEDSTAT(sleep_start);
833 PN_SCHEDSTAT(block_start);
834 PN_SCHEDSTAT(sleep_max);
835 PN_SCHEDSTAT(block_max);
836 PN_SCHEDSTAT(exec_max);
837 PN_SCHEDSTAT(slice_max);
838 PN_SCHEDSTAT(wait_max);
839 PN_SCHEDSTAT(wait_sum);
840 P_SCHEDSTAT(wait_count);
841 }
842
843 P(se->load.weight);
844 P(se->avg.load_avg);
845 P(se->avg.util_avg);
846 P(se->avg.runnable_avg);
847
848#undef PN_SCHEDSTAT
849#undef PN
850#undef P_SCHEDSTAT
851#undef P
852}
853#endif /* CONFIG_FAIR_GROUP_SCHED */
854
855#ifdef CONFIG_CGROUP_SCHED
856static DEFINE_SPINLOCK(sched_debug_lock);
857static char group_path[PATH_MAX];
858
859static void task_group_path(struct task_group *tg, char *path, int plen)
860{
861 if (autogroup_path(tg, path, plen))
862 return;
863
864 cgroup_path(tg->css.cgroup, path, plen);
865}
866
867/*
868 * Only 1 SEQ_printf_task_group_path() caller can use the full length
869 * group_path[] for cgroup path. Other simultaneous callers will have
870 * to use a shorter stack buffer. A "..." suffix is appended at the end
871 * of the stack buffer so that it will show up in case the output length
872 * matches the given buffer size to indicate possible path name truncation.
873 */
874#define SEQ_printf_task_group_path(m, tg, fmt...) \
875{ \
876 if (spin_trylock(&sched_debug_lock)) { \
877 task_group_path(tg, group_path, sizeof(group_path)); \
878 SEQ_printf(m, fmt, group_path); \
879 spin_unlock(&sched_debug_lock); \
880 } else { \
881 char buf[128]; \
882 char *bufend = buf + sizeof(buf) - 3; \
883 task_group_path(tg, buf, bufend - buf); \
884 strcpy(bufend - 1, "..."); \
885 SEQ_printf(m, fmt, buf); \
886 } \
887}
888#endif
889
890static void
891print_task(struct seq_file *m, struct rq *rq, struct task_struct *p)
892{
893 if (task_current(rq, p))
894 SEQ_printf(m, ">R");
895 else
896 SEQ_printf(m, " %c", task_state_to_char(p));
897
898 SEQ_printf(m, " %15s %5d %9Ld.%06ld %c %9Ld.%06ld %c %9Ld.%06ld %9Ld.%06ld %9Ld %5d ",
899 p->comm, task_pid_nr(p),
900 SPLIT_NS(p->se.vruntime),
901 entity_eligible(cfs_rq_of(&p->se), &p->se) ? 'E' : 'N',
902 SPLIT_NS(p->se.deadline),
903 p->se.custom_slice ? 'S' : ' ',
904 SPLIT_NS(p->se.slice),
905 SPLIT_NS(p->se.sum_exec_runtime),
906 (long long)(p->nvcsw + p->nivcsw),
907 p->prio);
908
909 SEQ_printf(m, "%9lld.%06ld %9lld.%06ld %9lld.%06ld",
910 SPLIT_NS(schedstat_val_or_zero(p->stats.wait_sum)),
911 SPLIT_NS(schedstat_val_or_zero(p->stats.sum_sleep_runtime)),
912 SPLIT_NS(schedstat_val_or_zero(p->stats.sum_block_runtime)));
913
914#ifdef CONFIG_NUMA_BALANCING
915 SEQ_printf(m, " %d %d", task_node(p), task_numa_group_id(p));
916#endif
917#ifdef CONFIG_CGROUP_SCHED
918 SEQ_printf_task_group_path(m, task_group(p), " %s")
919#endif
920
921 SEQ_printf(m, "\n");
922}
923
924static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu)
925{
926 struct task_struct *g, *p;
927
928 SEQ_printf(m, "\n");
929 SEQ_printf(m, "runnable tasks:\n");
930 SEQ_printf(m, " S task PID vruntime eligible "
931 "deadline slice sum-exec switches "
932 "prio wait-time sum-sleep sum-block"
933#ifdef CONFIG_NUMA_BALANCING
934 " node group-id"
935#endif
936#ifdef CONFIG_CGROUP_SCHED
937 " group-path"
938#endif
939 "\n");
940 SEQ_printf(m, "-------------------------------------------------------"
941 "------------------------------------------------------"
942 "------------------------------------------------------"
943#ifdef CONFIG_NUMA_BALANCING
944 "--------------"
945#endif
946#ifdef CONFIG_CGROUP_SCHED
947 "--------------"
948#endif
949 "\n");
950
951 rcu_read_lock();
952 for_each_process_thread(g, p) {
953 if (task_cpu(p) != rq_cpu)
954 continue;
955
956 print_task(m, rq, p);
957 }
958 rcu_read_unlock();
959}
960
961void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
962{
963 s64 left_vruntime = -1, right_vruntime = -1, left_deadline = -1, spread;
964 s64 zero_vruntime = -1, sum_w_vruntime = -1;
965 u64 avruntime;
966 struct sched_entity *last, *first, *root;
967 struct rq *rq = cpu_rq(cpu);
968 unsigned int sum_shift;
969 unsigned long flags;
970 u64 sum_weight;
971
972#ifdef CONFIG_FAIR_GROUP_SCHED
973 SEQ_printf(m, "\n");
974 SEQ_printf_task_group_path(m, cfs_rq->tg, "cfs_rq[%d]:%s\n", cpu);
975#else
976 SEQ_printf(m, "\n");
977 SEQ_printf(m, "cfs_rq[%d]:\n", cpu);
978#endif
979
980 raw_spin_rq_lock_irqsave(rq, flags);
981 root = __pick_root_entity(cfs_rq);
982 if (root)
983 left_vruntime = root->min_vruntime;
984 first = __pick_first_entity(cfs_rq);
985 if (first)
986 left_deadline = first->deadline;
987 last = __pick_last_entity(cfs_rq);
988 if (last)
989 right_vruntime = last->vruntime;
990 zero_vruntime = cfs_rq->zero_vruntime;
991 sum_w_vruntime = cfs_rq->sum_w_vruntime;
992 sum_weight = cfs_rq->sum_weight;
993 sum_shift = cfs_rq->sum_shift;
994 avruntime = avg_vruntime(cfs_rq);
995 raw_spin_rq_unlock_irqrestore(rq, flags);
996
997 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "left_deadline",
998 SPLIT_NS(left_deadline));
999 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "left_vruntime",
1000 SPLIT_NS(left_vruntime));
1001 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "zero_vruntime",
1002 SPLIT_NS(zero_vruntime));
1003 SEQ_printf(m, " .%-30s: %Ld (%d bits)\n", "sum_w_vruntime",
1004 sum_w_vruntime, ilog2(abs(sum_w_vruntime)));
1005 SEQ_printf(m, " .%-30s: %Lu\n", "sum_weight",
1006 sum_weight);
1007 SEQ_printf(m, " .%-30s: %u\n", "sum_shift", sum_shift);
1008 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "avg_vruntime",
1009 SPLIT_NS(avruntime));
1010 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "right_vruntime",
1011 SPLIT_NS(right_vruntime));
1012 spread = right_vruntime - left_vruntime;
1013 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "spread", SPLIT_NS(spread));
1014 SEQ_printf(m, " .%-30s: %d\n", "nr_queued", cfs_rq->nr_queued);
1015 SEQ_printf(m, " .%-30s: %d\n", "h_nr_runnable", cfs_rq->h_nr_runnable);
1016 SEQ_printf(m, " .%-30s: %d\n", "h_nr_queued", cfs_rq->h_nr_queued);
1017 SEQ_printf(m, " .%-30s: %d\n", "h_nr_idle", cfs_rq->h_nr_idle);
1018 SEQ_printf(m, " .%-30s: %ld\n", "load", cfs_rq->load.weight);
1019 SEQ_printf(m, " .%-30s: %lu\n", "load_avg",
1020 cfs_rq->avg.load_avg);
1021 SEQ_printf(m, " .%-30s: %lu\n", "runnable_avg",
1022 cfs_rq->avg.runnable_avg);
1023 SEQ_printf(m, " .%-30s: %lu\n", "util_avg",
1024 cfs_rq->avg.util_avg);
1025 SEQ_printf(m, " .%-30s: %u\n", "util_est",
1026 cfs_rq->avg.util_est);
1027 SEQ_printf(m, " .%-30s: %ld\n", "removed.load_avg",
1028 cfs_rq->removed.load_avg);
1029 SEQ_printf(m, " .%-30s: %ld\n", "removed.util_avg",
1030 cfs_rq->removed.util_avg);
1031 SEQ_printf(m, " .%-30s: %ld\n", "removed.runnable_avg",
1032 cfs_rq->removed.runnable_avg);
1033#ifdef CONFIG_FAIR_GROUP_SCHED
1034 SEQ_printf(m, " .%-30s: %lu\n", "tg_load_avg_contrib",
1035 cfs_rq->tg_load_avg_contrib);
1036 SEQ_printf(m, " .%-30s: %ld\n", "tg_load_avg",
1037 atomic_long_read(&cfs_rq->tg->load_avg));
1038#endif /* CONFIG_FAIR_GROUP_SCHED */
1039#ifdef CONFIG_CFS_BANDWIDTH
1040 SEQ_printf(m, " .%-30s: %d\n", "throttled",
1041 cfs_rq->throttled);
1042 SEQ_printf(m, " .%-30s: %d\n", "throttle_count",
1043 cfs_rq->throttle_count);
1044#endif
1045
1046#ifdef CONFIG_FAIR_GROUP_SCHED
1047 print_cfs_group_stats(m, cpu, cfs_rq->tg);
1048#endif
1049}
1050
1051void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq)
1052{
1053#ifdef CONFIG_RT_GROUP_SCHED
1054 SEQ_printf(m, "\n");
1055 SEQ_printf_task_group_path(m, rt_rq->tg, "rt_rq[%d]:%s\n", cpu);
1056#else
1057 SEQ_printf(m, "\n");
1058 SEQ_printf(m, "rt_rq[%d]:\n", cpu);
1059#endif
1060
1061#define P(x) \
1062 SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rt_rq->x))
1063#define PU(x) \
1064 SEQ_printf(m, " .%-30s: %lu\n", #x, (unsigned long)(rt_rq->x))
1065#define PN(x) \
1066 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rt_rq->x))
1067
1068 PU(rt_nr_running);
1069
1070#ifdef CONFIG_RT_GROUP_SCHED
1071 P(rt_throttled);
1072 PN(rt_time);
1073 PN(rt_runtime);
1074#endif
1075
1076#undef PN
1077#undef PU
1078#undef P
1079}
1080
1081void print_dl_rq(struct seq_file *m, int cpu, struct dl_rq *dl_rq)
1082{
1083 struct dl_bw *dl_bw;
1084
1085 SEQ_printf(m, "\n");
1086 SEQ_printf(m, "dl_rq[%d]:\n", cpu);
1087
1088#define PU(x) \
1089 SEQ_printf(m, " .%-30s: %lu\n", #x, (unsigned long)(dl_rq->x))
1090
1091 PU(dl_nr_running);
1092 dl_bw = &cpu_rq(cpu)->rd->dl_bw;
1093 SEQ_printf(m, " .%-30s: %lld\n", "dl_bw->bw", dl_bw->bw);
1094 SEQ_printf(m, " .%-30s: %lld\n", "dl_bw->total_bw", dl_bw->total_bw);
1095
1096#undef PU
1097}
1098
1099static void print_cpu(struct seq_file *m, int cpu)
1100{
1101 struct rq *rq = cpu_rq(cpu);
1102
1103#ifdef CONFIG_X86
1104 {
1105 unsigned int freq = cpu_khz ? : 1;
1106
1107 SEQ_printf(m, "cpu#%d, %u.%03u MHz\n",
1108 cpu, freq / 1000, (freq % 1000));
1109 }
1110#else /* !CONFIG_X86: */
1111 SEQ_printf(m, "cpu#%d\n", cpu);
1112#endif /* !CONFIG_X86 */
1113
1114#define P(x) \
1115do { \
1116 if (sizeof(rq->x) == 4) \
1117 SEQ_printf(m, " .%-30s: %d\n", #x, (int)(rq->x)); \
1118 else \
1119 SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rq->x));\
1120} while (0)
1121
1122#define PN(x) \
1123 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rq->x))
1124
1125 P(nr_running);
1126 P(nr_switches);
1127 P(nr_uninterruptible);
1128 PN(next_balance);
1129 SEQ_printf(m, " .%-30s: %ld\n", "curr->pid", (long)(task_pid_nr(rq->curr)));
1130 PN(clock);
1131 PN(clock_task);
1132#undef P
1133#undef PN
1134
1135#define P64(n) SEQ_printf(m, " .%-30s: %Ld\n", #n, rq->n);
1136 P64(avg_idle);
1137 P64(max_idle_balance_cost);
1138#undef P64
1139
1140#define P(n) SEQ_printf(m, " .%-30s: %d\n", #n, schedstat_val(rq->n));
1141 if (schedstat_enabled()) {
1142 P(yld_count);
1143 P(sched_count);
1144 P(sched_goidle);
1145 P(ttwu_count);
1146 P(ttwu_local);
1147 }
1148#undef P
1149
1150 print_cfs_stats(m, cpu);
1151 print_rt_stats(m, cpu);
1152 print_dl_stats(m, cpu);
1153
1154 print_rq(m, rq, cpu);
1155 SEQ_printf(m, "\n");
1156}
1157
1158static const char *sched_tunable_scaling_names[] = {
1159 "none",
1160 "logarithmic",
1161 "linear"
1162};
1163
1164static void sched_debug_header(struct seq_file *m)
1165{
1166 u64 ktime, sched_clk, cpu_clk;
1167 unsigned long flags;
1168
1169 local_irq_save(flags);
1170 ktime = ktime_to_ns(ktime_get());
1171 sched_clk = sched_clock();
1172 cpu_clk = local_clock();
1173 local_irq_restore(flags);
1174
1175 SEQ_printf(m, "Sched Debug Version: v0.11, %s %.*s\n",
1176 init_utsname()->release,
1177 (int)strcspn(init_utsname()->version, " "),
1178 init_utsname()->version);
1179
1180#define P(x) \
1181 SEQ_printf(m, "%-40s: %Ld\n", #x, (long long)(x))
1182#define PN(x) \
1183 SEQ_printf(m, "%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x))
1184 PN(ktime);
1185 PN(sched_clk);
1186 PN(cpu_clk);
1187 P(jiffies);
1188#ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
1189 P(sched_clock_stable());
1190#endif
1191#undef PN
1192#undef P
1193
1194 SEQ_printf(m, "\n");
1195 SEQ_printf(m, "sysctl_sched\n");
1196
1197#define P(x) \
1198 SEQ_printf(m, " .%-40s: %Ld\n", #x, (long long)(x))
1199#define PN(x) \
1200 SEQ_printf(m, " .%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x))
1201 PN(sysctl_sched_base_slice);
1202 P(sysctl_sched_features);
1203#undef PN
1204#undef P
1205
1206 SEQ_printf(m, " .%-40s: %d (%s)\n",
1207 "sysctl_sched_tunable_scaling",
1208 sysctl_sched_tunable_scaling,
1209 sched_tunable_scaling_names[sysctl_sched_tunable_scaling]);
1210 SEQ_printf(m, "\n");
1211}
1212
1213static int sched_debug_show(struct seq_file *m, void *v)
1214{
1215 int cpu = (unsigned long)(v - 2);
1216
1217 if (cpu != -1)
1218 print_cpu(m, cpu);
1219 else
1220 sched_debug_header(m);
1221
1222 return 0;
1223}
1224
1225void sysrq_sched_debug_show(void)
1226{
1227 int cpu;
1228
1229 sched_debug_header(NULL);
1230 for_each_online_cpu(cpu) {
1231 /*
1232 * Need to reset softlockup watchdogs on all CPUs, because
1233 * another CPU might be blocked waiting for us to process
1234 * an IPI or stop_machine.
1235 */
1236 touch_nmi_watchdog();
1237 touch_all_softlockup_watchdogs();
1238 print_cpu(NULL, cpu);
1239 }
1240}
1241
1242/*
1243 * This iterator needs some explanation.
1244 * It returns 1 for the header position.
1245 * This means 2 is CPU 0.
1246 * In a hotplugged system some CPUs, including CPU 0, may be missing so we have
1247 * to use cpumask_* to iterate over the CPUs.
1248 */
1249static void *sched_debug_start(struct seq_file *file, loff_t *offset)
1250{
1251 unsigned long n = *offset;
1252
1253 if (n == 0)
1254 return (void *) 1;
1255
1256 n--;
1257
1258 if (n > 0)
1259 n = cpumask_next(n - 1, cpu_online_mask);
1260 else
1261 n = cpumask_first(cpu_online_mask);
1262
1263 *offset = n + 1;
1264
1265 if (n < nr_cpu_ids)
1266 return (void *)(unsigned long)(n + 2);
1267
1268 return NULL;
1269}
1270
1271static void *sched_debug_next(struct seq_file *file, void *data, loff_t *offset)
1272{
1273 (*offset)++;
1274 return sched_debug_start(file, offset);
1275}
1276
1277static void sched_debug_stop(struct seq_file *file, void *data)
1278{
1279}
1280
1281static const struct seq_operations sched_debug_sops = {
1282 .start = sched_debug_start,
1283 .next = sched_debug_next,
1284 .stop = sched_debug_stop,
1285 .show = sched_debug_show,
1286};
1287
1288#define __PS(S, F) SEQ_printf(m, "%-45s:%21Ld\n", S, (long long)(F))
1289#define __P(F) __PS(#F, F)
1290#define P(F) __PS(#F, p->F)
1291#define PM(F, M) __PS(#F, p->F & (M))
1292#define __PSN(S, F) SEQ_printf(m, "%-45s:%14Ld.%06ld\n", S, SPLIT_NS((long long)(F)))
1293#define __PN(F) __PSN(#F, F)
1294#define PN(F) __PSN(#F, p->F)
1295
1296
1297#ifdef CONFIG_NUMA_BALANCING
1298void print_numa_stats(struct seq_file *m, int node, unsigned long tsf,
1299 unsigned long tpf, unsigned long gsf, unsigned long gpf)
1300{
1301 SEQ_printf(m, "numa_faults node=%d ", node);
1302 SEQ_printf(m, "task_private=%lu task_shared=%lu ", tpf, tsf);
1303 SEQ_printf(m, "group_private=%lu group_shared=%lu\n", gpf, gsf);
1304}
1305#endif
1306
1307
1308static void sched_show_numa(struct task_struct *p, struct seq_file *m)
1309{
1310#ifdef CONFIG_NUMA_BALANCING
1311 if (p->mm)
1312 P(mm->numa_scan_seq);
1313
1314 P(numa_pages_migrated);
1315 P(numa_preferred_nid);
1316 P(total_numa_faults);
1317 SEQ_printf(m, "current_node=%d, numa_group_id=%d\n",
1318 task_node(p), task_numa_group_id(p));
1319 show_numa_stats(p, m);
1320#endif /* CONFIG_NUMA_BALANCING */
1321}
1322
1323void proc_sched_show_task(struct task_struct *p, struct pid_namespace *ns,
1324 struct seq_file *m)
1325{
1326 unsigned long nr_switches;
1327
1328 SEQ_printf(m, "%s (%d, #threads: %d)\n", p->comm, task_pid_nr_ns(p, ns),
1329 get_nr_threads(p));
1330 SEQ_printf(m,
1331 "---------------------------------------------------------"
1332 "----------\n");
1333
1334#define P_SCHEDSTAT(F) __PS(#F, schedstat_val(p->stats.F))
1335#define PN_SCHEDSTAT(F) __PSN(#F, schedstat_val(p->stats.F))
1336
1337 PN(se.exec_start);
1338 PN(se.vruntime);
1339 PN(se.sum_exec_runtime);
1340
1341 nr_switches = p->nvcsw + p->nivcsw;
1342
1343 P(se.nr_migrations);
1344
1345 if (schedstat_enabled()) {
1346 u64 avg_atom, avg_per_cpu;
1347
1348 PN_SCHEDSTAT(sum_sleep_runtime);
1349 PN_SCHEDSTAT(sum_block_runtime);
1350 PN_SCHEDSTAT(wait_start);
1351 PN_SCHEDSTAT(sleep_start);
1352 PN_SCHEDSTAT(block_start);
1353 PN_SCHEDSTAT(sleep_max);
1354 PN_SCHEDSTAT(block_max);
1355 PN_SCHEDSTAT(exec_max);
1356 PN_SCHEDSTAT(slice_max);
1357 PN_SCHEDSTAT(wait_max);
1358 PN_SCHEDSTAT(wait_sum);
1359 P_SCHEDSTAT(wait_count);
1360 PN_SCHEDSTAT(iowait_sum);
1361 P_SCHEDSTAT(iowait_count);
1362 P_SCHEDSTAT(nr_migrations_cold);
1363 P_SCHEDSTAT(nr_failed_migrations_affine);
1364 P_SCHEDSTAT(nr_failed_migrations_running);
1365 P_SCHEDSTAT(nr_failed_migrations_hot);
1366 P_SCHEDSTAT(nr_forced_migrations);
1367 P_SCHEDSTAT(nr_wakeups);
1368 P_SCHEDSTAT(nr_wakeups_sync);
1369 P_SCHEDSTAT(nr_wakeups_migrate);
1370 P_SCHEDSTAT(nr_wakeups_local);
1371 P_SCHEDSTAT(nr_wakeups_remote);
1372 P_SCHEDSTAT(nr_wakeups_affine);
1373 P_SCHEDSTAT(nr_wakeups_affine_attempts);
1374 P_SCHEDSTAT(nr_wakeups_passive);
1375 P_SCHEDSTAT(nr_wakeups_idle);
1376
1377 avg_atom = p->se.sum_exec_runtime;
1378 if (nr_switches)
1379 avg_atom = div64_ul(avg_atom, nr_switches);
1380 else
1381 avg_atom = -1LL;
1382
1383 avg_per_cpu = p->se.sum_exec_runtime;
1384 if (p->se.nr_migrations) {
1385 avg_per_cpu = div64_u64(avg_per_cpu,
1386 p->se.nr_migrations);
1387 } else {
1388 avg_per_cpu = -1LL;
1389 }
1390
1391 __PN(avg_atom);
1392 __PN(avg_per_cpu);
1393
1394#ifdef CONFIG_SCHED_CORE
1395 PN_SCHEDSTAT(core_forceidle_sum);
1396#endif
1397 }
1398
1399 __P(nr_switches);
1400 __PS("nr_voluntary_switches", p->nvcsw);
1401 __PS("nr_involuntary_switches", p->nivcsw);
1402
1403 P(se.load.weight);
1404 P(se.avg.load_sum);
1405 P(se.avg.runnable_sum);
1406 P(se.avg.util_sum);
1407 P(se.avg.load_avg);
1408 P(se.avg.runnable_avg);
1409 P(se.avg.util_avg);
1410 P(se.avg.last_update_time);
1411 PM(se.avg.util_est, ~UTIL_AVG_UNCHANGED);
1412#ifdef CONFIG_UCLAMP_TASK
1413 __PS("uclamp.min", p->uclamp_req[UCLAMP_MIN].value);
1414 __PS("uclamp.max", p->uclamp_req[UCLAMP_MAX].value);
1415 __PS("effective uclamp.min", uclamp_eff_value(p, UCLAMP_MIN));
1416 __PS("effective uclamp.max", uclamp_eff_value(p, UCLAMP_MAX));
1417#endif /* CONFIG_UCLAMP_TASK */
1418 P(policy);
1419 P(prio);
1420 if (task_has_dl_policy(p)) {
1421 P(dl.runtime);
1422 P(dl.deadline);
1423 } else if (fair_policy(p->policy)) {
1424 P(se.slice);
1425 }
1426#ifdef CONFIG_SCHED_CLASS_EXT
1427 __PS("ext.enabled", task_on_scx(p));
1428#endif
1429#undef PN_SCHEDSTAT
1430#undef P_SCHEDSTAT
1431
1432 {
1433 unsigned int this_cpu = raw_smp_processor_id();
1434 u64 t0, t1;
1435
1436 t0 = cpu_clock(this_cpu);
1437 t1 = cpu_clock(this_cpu);
1438 __PS("clock-delta", t1-t0);
1439 }
1440
1441 sched_show_numa(p, m);
1442}
1443
1444void proc_sched_set_task(struct task_struct *p)
1445{
1446#ifdef CONFIG_SCHEDSTATS
1447 memset(&p->stats, 0, sizeof(p->stats));
1448#endif
1449}
1450
1451void resched_latency_warn(int cpu, u64 latency)
1452{
1453 static DEFINE_RATELIMIT_STATE(latency_check_ratelimit, 60 * 60 * HZ, 1);
1454
1455 if (likely(!__ratelimit(&latency_check_ratelimit)))
1456 return;
1457
1458 pr_err("sched: CPU %d need_resched set for > %llu ns (%d ticks) without schedule\n",
1459 cpu, latency, cpu_rq(cpu)->ticks_without_resched);
1460 dump_stack();
1461}