1 // SPDX-License-Identifier: GPL-2.0-only
5 * Print the CFS rbtree and other debugging details
7 * Copyright(C) 2007, Red Hat, Inc., Ingo Molnar
11 * This allows printing both to /proc/sched_debug and
14 #define SEQ_printf(m, x...) \
23 * Ease the printing of nsec fields:
25 static long long nsec_high(unsigned long long nsec)
27 if ((long long)nsec < 0) {
29 do_div(nsec, 1000000);
32 do_div(nsec, 1000000);
37 static unsigned long nsec_low(unsigned long long nsec)
39 if ((long long)nsec < 0)
42 return do_div(nsec, 1000000);
45 #define SPLIT_NS(x) nsec_high(x), nsec_low(x)
47 #define SCHED_FEAT(name, enabled) \
50 static const char * const sched_feat_names[] = {
56 static int sched_feat_show(struct seq_file *m, void *v)
60 for (i = 0; i < __SCHED_FEAT_NR; i++) {
61 if (!(sysctl_sched_features & (1UL << i)))
63 seq_printf(m, "%s ", sched_feat_names[i]);
70 #ifdef CONFIG_JUMP_LABEL
72 #define jump_label_key__true STATIC_KEY_INIT_TRUE
73 #define jump_label_key__false STATIC_KEY_INIT_FALSE
75 #define SCHED_FEAT(name, enabled) \
76 jump_label_key__##enabled ,
78 struct static_key sched_feat_keys[__SCHED_FEAT_NR] = {
84 static void sched_feat_disable(int i)
86 static_key_disable_cpuslocked(&sched_feat_keys[i]);
89 static void sched_feat_enable(int i)
91 static_key_enable_cpuslocked(&sched_feat_keys[i]);
94 static void sched_feat_disable(int i) { };
95 static void sched_feat_enable(int i) { };
96 #endif /* CONFIG_JUMP_LABEL */
98 static int sched_feat_set(char *cmp)
103 if (strncmp(cmp, "NO_", 3) == 0) {
108 i = match_string(sched_feat_names, __SCHED_FEAT_NR, cmp);
113 sysctl_sched_features &= ~(1UL << i);
114 sched_feat_disable(i);
116 sysctl_sched_features |= (1UL << i);
117 sched_feat_enable(i);
124 sched_feat_write(struct file *filp, const char __user *ubuf,
125 size_t cnt, loff_t *ppos)
135 if (copy_from_user(&buf, ubuf, cnt))
141 /* Ensure the static_key remains in a consistent state */
142 inode = file_inode(filp);
145 ret = sched_feat_set(cmp);
156 static int sched_feat_open(struct inode *inode, struct file *filp)
158 return single_open(filp, sched_feat_show, NULL);
161 static const struct file_operations sched_feat_fops = {
162 .open = sched_feat_open,
163 .write = sched_feat_write,
166 .release = single_release,
171 static ssize_t sched_scaling_write(struct file *filp, const char __user *ubuf,
172 size_t cnt, loff_t *ppos)
175 unsigned int scaling;
180 if (copy_from_user(&buf, ubuf, cnt))
184 if (kstrtouint(buf, 10, &scaling))
187 if (scaling >= SCHED_TUNABLESCALING_END)
190 sysctl_sched_tunable_scaling = scaling;
191 if (sched_update_scaling())
198 static int sched_scaling_show(struct seq_file *m, void *v)
200 seq_printf(m, "%d\n", sysctl_sched_tunable_scaling);
204 static int sched_scaling_open(struct inode *inode, struct file *filp)
206 return single_open(filp, sched_scaling_show, NULL);
209 static const struct file_operations sched_scaling_fops = {
210 .open = sched_scaling_open,
211 .write = sched_scaling_write,
214 .release = single_release,
219 #ifdef CONFIG_PREEMPT_DYNAMIC
221 static ssize_t sched_dynamic_write(struct file *filp, const char __user *ubuf,
222 size_t cnt, loff_t *ppos)
230 if (copy_from_user(&buf, ubuf, cnt))
234 mode = sched_dynamic_mode(strstrip(buf));
238 sched_dynamic_update(mode);
245 static int sched_dynamic_show(struct seq_file *m, void *v)
247 static const char * preempt_modes[] = {
248 "none", "voluntary", "full"
252 for (i = 0; i < ARRAY_SIZE(preempt_modes); i++) {
253 if (preempt_dynamic_mode == i)
255 seq_puts(m, preempt_modes[i]);
256 if (preempt_dynamic_mode == i)
266 static int sched_dynamic_open(struct inode *inode, struct file *filp)
268 return single_open(filp, sched_dynamic_show, NULL);
271 static const struct file_operations sched_dynamic_fops = {
272 .open = sched_dynamic_open,
273 .write = sched_dynamic_write,
276 .release = single_release,
279 #endif /* CONFIG_PREEMPT_DYNAMIC */
281 __read_mostly bool sched_debug_verbose;
284 static struct dentry *sd_dentry;
287 static ssize_t sched_verbose_write(struct file *filp, const char __user *ubuf,
288 size_t cnt, loff_t *ppos)
294 mutex_lock(&sched_domains_mutex);
296 orig = sched_debug_verbose;
297 result = debugfs_write_file_bool(filp, ubuf, cnt, ppos);
299 if (sched_debug_verbose && !orig)
300 update_sched_domain_debugfs();
301 else if (!sched_debug_verbose && orig) {
302 debugfs_remove(sd_dentry);
306 mutex_unlock(&sched_domains_mutex);
312 #define sched_verbose_write debugfs_write_file_bool
315 static const struct file_operations sched_verbose_fops = {
316 .read = debugfs_read_file_bool,
317 .write = sched_verbose_write,
319 .llseek = default_llseek,
322 static const struct seq_operations sched_debug_sops;
324 static int sched_debug_open(struct inode *inode, struct file *filp)
326 return seq_open(filp, &sched_debug_sops);
329 static const struct file_operations sched_debug_fops = {
330 .open = sched_debug_open,
333 .release = seq_release,
336 static struct dentry *debugfs_sched;
338 static __init int sched_init_debug(void)
340 struct dentry __maybe_unused *numa;
342 debugfs_sched = debugfs_create_dir("sched", NULL);
344 debugfs_create_file("features", 0644, debugfs_sched, NULL, &sched_feat_fops);
345 debugfs_create_file_unsafe("verbose", 0644, debugfs_sched, &sched_debug_verbose, &sched_verbose_fops);
346 #ifdef CONFIG_PREEMPT_DYNAMIC
347 debugfs_create_file("preempt", 0644, debugfs_sched, NULL, &sched_dynamic_fops);
350 debugfs_create_u32("latency_ns", 0644, debugfs_sched, &sysctl_sched_latency);
351 debugfs_create_u32("min_granularity_ns", 0644, debugfs_sched, &sysctl_sched_min_granularity);
352 debugfs_create_u32("idle_min_granularity_ns", 0644, debugfs_sched, &sysctl_sched_idle_min_granularity);
353 debugfs_create_u32("wakeup_granularity_ns", 0644, debugfs_sched, &sysctl_sched_wakeup_granularity);
355 debugfs_create_u32("latency_warn_ms", 0644, debugfs_sched, &sysctl_resched_latency_warn_ms);
356 debugfs_create_u32("latency_warn_once", 0644, debugfs_sched, &sysctl_resched_latency_warn_once);
359 debugfs_create_file("tunable_scaling", 0644, debugfs_sched, NULL, &sched_scaling_fops);
360 debugfs_create_u32("migration_cost_ns", 0644, debugfs_sched, &sysctl_sched_migration_cost);
361 debugfs_create_u32("nr_migrate", 0644, debugfs_sched, &sysctl_sched_nr_migrate);
363 mutex_lock(&sched_domains_mutex);
364 update_sched_domain_debugfs();
365 mutex_unlock(&sched_domains_mutex);
368 #ifdef CONFIG_NUMA_BALANCING
369 numa = debugfs_create_dir("numa_balancing", debugfs_sched);
371 debugfs_create_u32("scan_delay_ms", 0644, numa, &sysctl_numa_balancing_scan_delay);
372 debugfs_create_u32("scan_period_min_ms", 0644, numa, &sysctl_numa_balancing_scan_period_min);
373 debugfs_create_u32("scan_period_max_ms", 0644, numa, &sysctl_numa_balancing_scan_period_max);
374 debugfs_create_u32("scan_size_mb", 0644, numa, &sysctl_numa_balancing_scan_size);
375 debugfs_create_u32("hot_threshold_ms", 0644, numa, &sysctl_numa_balancing_hot_threshold);
378 debugfs_create_file("debug", 0444, debugfs_sched, NULL, &sched_debug_fops);
382 late_initcall(sched_init_debug);
386 static cpumask_var_t sd_sysctl_cpus;
388 static int sd_flags_show(struct seq_file *m, void *v)
390 unsigned long flags = *(unsigned int *)m->private;
393 for_each_set_bit(idx, &flags, __SD_FLAG_CNT) {
394 seq_puts(m, sd_flag_debug[idx].name);
402 static int sd_flags_open(struct inode *inode, struct file *file)
404 return single_open(file, sd_flags_show, inode->i_private);
407 static const struct file_operations sd_flags_fops = {
408 .open = sd_flags_open,
411 .release = single_release,
414 static void register_sd(struct sched_domain *sd, struct dentry *parent)
416 #define SDM(type, mode, member) \
417 debugfs_create_##type(#member, mode, parent, &sd->member)
419 SDM(ulong, 0644, min_interval);
420 SDM(ulong, 0644, max_interval);
421 SDM(u64, 0644, max_newidle_lb_cost);
422 SDM(u32, 0644, busy_factor);
423 SDM(u32, 0644, imbalance_pct);
424 SDM(u32, 0644, cache_nice_tries);
425 SDM(str, 0444, name);
429 debugfs_create_file("flags", 0444, parent, &sd->flags, &sd_flags_fops);
430 debugfs_create_file("groups_flags", 0444, parent, &sd->groups->flags, &sd_flags_fops);
433 void update_sched_domain_debugfs(void)
438 * This can unfortunately be invoked before sched_debug_init() creates
439 * the debug directory. Don't touch sd_sysctl_cpus until then.
444 if (!sched_debug_verbose)
447 if (!cpumask_available(sd_sysctl_cpus)) {
448 if (!alloc_cpumask_var(&sd_sysctl_cpus, GFP_KERNEL))
450 cpumask_copy(sd_sysctl_cpus, cpu_possible_mask);
454 sd_dentry = debugfs_create_dir("domains", debugfs_sched);
456 /* rebuild sd_sysctl_cpus if empty since it gets cleared below */
457 if (cpumask_empty(sd_sysctl_cpus))
458 cpumask_copy(sd_sysctl_cpus, cpu_online_mask);
461 for_each_cpu(cpu, sd_sysctl_cpus) {
462 struct sched_domain *sd;
463 struct dentry *d_cpu;
466 snprintf(buf, sizeof(buf), "cpu%d", cpu);
467 debugfs_lookup_and_remove(buf, sd_dentry);
468 d_cpu = debugfs_create_dir(buf, sd_dentry);
471 for_each_domain(cpu, sd) {
474 snprintf(buf, sizeof(buf), "domain%d", i);
475 d_sd = debugfs_create_dir(buf, d_cpu);
477 register_sd(sd, d_sd);
481 __cpumask_clear_cpu(cpu, sd_sysctl_cpus);
485 void dirty_sched_domain_sysctl(int cpu)
487 if (cpumask_available(sd_sysctl_cpus))
488 __cpumask_set_cpu(cpu, sd_sysctl_cpus);
491 #endif /* CONFIG_SMP */
493 #ifdef CONFIG_FAIR_GROUP_SCHED
494 static void print_cfs_group_stats(struct seq_file *m, int cpu, struct task_group *tg)
496 struct sched_entity *se = tg->se[cpu];
498 #define P(F) SEQ_printf(m, " .%-30s: %lld\n", #F, (long long)F)
499 #define P_SCHEDSTAT(F) SEQ_printf(m, " .%-30s: %lld\n", \
500 #F, (long long)schedstat_val(stats->F))
501 #define PN(F) SEQ_printf(m, " .%-30s: %lld.%06ld\n", #F, SPLIT_NS((long long)F))
502 #define PN_SCHEDSTAT(F) SEQ_printf(m, " .%-30s: %lld.%06ld\n", \
503 #F, SPLIT_NS((long long)schedstat_val(stats->F)))
510 PN(se->sum_exec_runtime);
512 if (schedstat_enabled()) {
513 struct sched_statistics *stats;
514 stats = __schedstats_from_se(se);
516 PN_SCHEDSTAT(wait_start);
517 PN_SCHEDSTAT(sleep_start);
518 PN_SCHEDSTAT(block_start);
519 PN_SCHEDSTAT(sleep_max);
520 PN_SCHEDSTAT(block_max);
521 PN_SCHEDSTAT(exec_max);
522 PN_SCHEDSTAT(slice_max);
523 PN_SCHEDSTAT(wait_max);
524 PN_SCHEDSTAT(wait_sum);
525 P_SCHEDSTAT(wait_count);
532 P(se->avg.runnable_avg);
542 #ifdef CONFIG_CGROUP_SCHED
543 static DEFINE_SPINLOCK(sched_debug_lock);
544 static char group_path[PATH_MAX];
546 static void task_group_path(struct task_group *tg, char *path, int plen)
548 if (autogroup_path(tg, path, plen))
551 cgroup_path(tg->css.cgroup, path, plen);
555 * Only 1 SEQ_printf_task_group_path() caller can use the full length
556 * group_path[] for cgroup path. Other simultaneous callers will have
557 * to use a shorter stack buffer. A "..." suffix is appended at the end
558 * of the stack buffer so that it will show up in case the output length
559 * matches the given buffer size to indicate possible path name truncation.
561 #define SEQ_printf_task_group_path(m, tg, fmt...) \
563 if (spin_trylock(&sched_debug_lock)) { \
564 task_group_path(tg, group_path, sizeof(group_path)); \
565 SEQ_printf(m, fmt, group_path); \
566 spin_unlock(&sched_debug_lock); \
569 char *bufend = buf + sizeof(buf) - 3; \
570 task_group_path(tg, buf, bufend - buf); \
571 strcpy(bufend - 1, "..."); \
572 SEQ_printf(m, fmt, buf); \
578 print_task(struct seq_file *m, struct rq *rq, struct task_struct *p)
580 if (task_current(rq, p))
583 SEQ_printf(m, " %c", task_state_to_char(p));
585 SEQ_printf(m, " %15s %5d %9Ld.%06ld %9Ld %5d ",
586 p->comm, task_pid_nr(p),
587 SPLIT_NS(p->se.vruntime),
588 (long long)(p->nvcsw + p->nivcsw),
591 SEQ_printf(m, "%9lld.%06ld %9lld.%06ld %9lld.%06ld %9lld.%06ld",
592 SPLIT_NS(schedstat_val_or_zero(p->stats.wait_sum)),
593 SPLIT_NS(p->se.sum_exec_runtime),
594 SPLIT_NS(schedstat_val_or_zero(p->stats.sum_sleep_runtime)),
595 SPLIT_NS(schedstat_val_or_zero(p->stats.sum_block_runtime)));
597 #ifdef CONFIG_NUMA_BALANCING
598 SEQ_printf(m, " %d %d", task_node(p), task_numa_group_id(p));
600 #ifdef CONFIG_CGROUP_SCHED
601 SEQ_printf_task_group_path(m, task_group(p), " %s")
607 static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu)
609 struct task_struct *g, *p;
612 SEQ_printf(m, "runnable tasks:\n");
613 SEQ_printf(m, " S task PID tree-key switches prio"
614 " wait-time sum-exec sum-sleep\n");
615 SEQ_printf(m, "-------------------------------------------------------"
616 "------------------------------------------------------\n");
619 for_each_process_thread(g, p) {
620 if (task_cpu(p) != rq_cpu)
623 print_task(m, rq, p);
628 void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
630 s64 left_vruntime = -1, min_vruntime, right_vruntime = -1, spread;
631 struct sched_entity *last, *first;
632 struct rq *rq = cpu_rq(cpu);
635 #ifdef CONFIG_FAIR_GROUP_SCHED
637 SEQ_printf_task_group_path(m, cfs_rq->tg, "cfs_rq[%d]:%s\n", cpu);
640 SEQ_printf(m, "cfs_rq[%d]:\n", cpu);
642 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "exec_clock",
643 SPLIT_NS(cfs_rq->exec_clock));
645 raw_spin_rq_lock_irqsave(rq, flags);
646 first = __pick_first_entity(cfs_rq);
648 left_vruntime = first->vruntime;
649 last = __pick_last_entity(cfs_rq);
651 right_vruntime = last->vruntime;
652 min_vruntime = cfs_rq->min_vruntime;
653 raw_spin_rq_unlock_irqrestore(rq, flags);
655 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "left_vruntime",
656 SPLIT_NS(left_vruntime));
657 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "min_vruntime",
658 SPLIT_NS(min_vruntime));
659 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "avg_vruntime",
660 SPLIT_NS(avg_vruntime(cfs_rq)));
661 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "right_vruntime",
662 SPLIT_NS(right_vruntime));
663 spread = right_vruntime - left_vruntime;
664 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "spread", SPLIT_NS(spread));
665 SEQ_printf(m, " .%-30s: %d\n", "nr_spread_over",
666 cfs_rq->nr_spread_over);
667 SEQ_printf(m, " .%-30s: %d\n", "nr_running", cfs_rq->nr_running);
668 SEQ_printf(m, " .%-30s: %d\n", "h_nr_running", cfs_rq->h_nr_running);
669 SEQ_printf(m, " .%-30s: %d\n", "idle_nr_running",
670 cfs_rq->idle_nr_running);
671 SEQ_printf(m, " .%-30s: %d\n", "idle_h_nr_running",
672 cfs_rq->idle_h_nr_running);
673 SEQ_printf(m, " .%-30s: %ld\n", "load", cfs_rq->load.weight);
675 SEQ_printf(m, " .%-30s: %lu\n", "load_avg",
676 cfs_rq->avg.load_avg);
677 SEQ_printf(m, " .%-30s: %lu\n", "runnable_avg",
678 cfs_rq->avg.runnable_avg);
679 SEQ_printf(m, " .%-30s: %lu\n", "util_avg",
680 cfs_rq->avg.util_avg);
681 SEQ_printf(m, " .%-30s: %u\n", "util_est_enqueued",
682 cfs_rq->avg.util_est.enqueued);
683 SEQ_printf(m, " .%-30s: %ld\n", "removed.load_avg",
684 cfs_rq->removed.load_avg);
685 SEQ_printf(m, " .%-30s: %ld\n", "removed.util_avg",
686 cfs_rq->removed.util_avg);
687 SEQ_printf(m, " .%-30s: %ld\n", "removed.runnable_avg",
688 cfs_rq->removed.runnable_avg);
689 #ifdef CONFIG_FAIR_GROUP_SCHED
690 SEQ_printf(m, " .%-30s: %lu\n", "tg_load_avg_contrib",
691 cfs_rq->tg_load_avg_contrib);
692 SEQ_printf(m, " .%-30s: %ld\n", "tg_load_avg",
693 atomic_long_read(&cfs_rq->tg->load_avg));
696 #ifdef CONFIG_CFS_BANDWIDTH
697 SEQ_printf(m, " .%-30s: %d\n", "throttled",
699 SEQ_printf(m, " .%-30s: %d\n", "throttle_count",
700 cfs_rq->throttle_count);
703 #ifdef CONFIG_FAIR_GROUP_SCHED
704 print_cfs_group_stats(m, cpu, cfs_rq->tg);
708 void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq)
710 #ifdef CONFIG_RT_GROUP_SCHED
712 SEQ_printf_task_group_path(m, rt_rq->tg, "rt_rq[%d]:%s\n", cpu);
715 SEQ_printf(m, "rt_rq[%d]:\n", cpu);
719 SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rt_rq->x))
721 SEQ_printf(m, " .%-30s: %lu\n", #x, (unsigned long)(rt_rq->x))
723 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rt_rq->x))
738 void print_dl_rq(struct seq_file *m, int cpu, struct dl_rq *dl_rq)
743 SEQ_printf(m, "dl_rq[%d]:\n", cpu);
746 SEQ_printf(m, " .%-30s: %lu\n", #x, (unsigned long)(dl_rq->x))
751 dl_bw = &cpu_rq(cpu)->rd->dl_bw;
753 dl_bw = &dl_rq->dl_bw;
755 SEQ_printf(m, " .%-30s: %lld\n", "dl_bw->bw", dl_bw->bw);
756 SEQ_printf(m, " .%-30s: %lld\n", "dl_bw->total_bw", dl_bw->total_bw);
761 static void print_cpu(struct seq_file *m, int cpu)
763 struct rq *rq = cpu_rq(cpu);
767 unsigned int freq = cpu_khz ? : 1;
769 SEQ_printf(m, "cpu#%d, %u.%03u MHz\n",
770 cpu, freq / 1000, (freq % 1000));
773 SEQ_printf(m, "cpu#%d\n", cpu);
778 if (sizeof(rq->x) == 4) \
779 SEQ_printf(m, " .%-30s: %d\n", #x, (int)(rq->x)); \
781 SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rq->x));\
785 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rq->x))
789 P(nr_uninterruptible);
791 SEQ_printf(m, " .%-30s: %ld\n", "curr->pid", (long)(task_pid_nr(rq->curr)));
798 #define P64(n) SEQ_printf(m, " .%-30s: %Ld\n", #n, rq->n);
800 P64(max_idle_balance_cost);
804 #define P(n) SEQ_printf(m, " .%-30s: %d\n", #n, schedstat_val(rq->n));
805 if (schedstat_enabled()) {
814 print_cfs_stats(m, cpu);
815 print_rt_stats(m, cpu);
816 print_dl_stats(m, cpu);
818 print_rq(m, rq, cpu);
822 static const char *sched_tunable_scaling_names[] = {
828 static void sched_debug_header(struct seq_file *m)
830 u64 ktime, sched_clk, cpu_clk;
833 local_irq_save(flags);
834 ktime = ktime_to_ns(ktime_get());
835 sched_clk = sched_clock();
836 cpu_clk = local_clock();
837 local_irq_restore(flags);
839 SEQ_printf(m, "Sched Debug Version: v0.11, %s %.*s\n",
840 init_utsname()->release,
841 (int)strcspn(init_utsname()->version, " "),
842 init_utsname()->version);
845 SEQ_printf(m, "%-40s: %Ld\n", #x, (long long)(x))
847 SEQ_printf(m, "%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x))
852 #ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
853 P(sched_clock_stable());
859 SEQ_printf(m, "sysctl_sched\n");
862 SEQ_printf(m, " .%-40s: %Ld\n", #x, (long long)(x))
864 SEQ_printf(m, " .%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x))
865 PN(sysctl_sched_latency);
866 PN(sysctl_sched_min_granularity);
867 PN(sysctl_sched_idle_min_granularity);
868 PN(sysctl_sched_wakeup_granularity);
869 P(sysctl_sched_child_runs_first);
870 P(sysctl_sched_features);
874 SEQ_printf(m, " .%-40s: %d (%s)\n",
875 "sysctl_sched_tunable_scaling",
876 sysctl_sched_tunable_scaling,
877 sched_tunable_scaling_names[sysctl_sched_tunable_scaling]);
881 static int sched_debug_show(struct seq_file *m, void *v)
883 int cpu = (unsigned long)(v - 2);
888 sched_debug_header(m);
893 void sysrq_sched_debug_show(void)
897 sched_debug_header(NULL);
898 for_each_online_cpu(cpu) {
900 * Need to reset softlockup watchdogs on all CPUs, because
901 * another CPU might be blocked waiting for us to process
902 * an IPI or stop_machine.
904 touch_nmi_watchdog();
905 touch_all_softlockup_watchdogs();
906 print_cpu(NULL, cpu);
911 * This iterator needs some explanation.
912 * It returns 1 for the header position.
913 * This means 2 is CPU 0.
914 * In a hotplugged system some CPUs, including CPU 0, may be missing so we have
915 * to use cpumask_* to iterate over the CPUs.
917 static void *sched_debug_start(struct seq_file *file, loff_t *offset)
919 unsigned long n = *offset;
927 n = cpumask_next(n - 1, cpu_online_mask);
929 n = cpumask_first(cpu_online_mask);
934 return (void *)(unsigned long)(n + 2);
939 static void *sched_debug_next(struct seq_file *file, void *data, loff_t *offset)
942 return sched_debug_start(file, offset);
945 static void sched_debug_stop(struct seq_file *file, void *data)
949 static const struct seq_operations sched_debug_sops = {
950 .start = sched_debug_start,
951 .next = sched_debug_next,
952 .stop = sched_debug_stop,
953 .show = sched_debug_show,
956 #define __PS(S, F) SEQ_printf(m, "%-45s:%21Ld\n", S, (long long)(F))
957 #define __P(F) __PS(#F, F)
958 #define P(F) __PS(#F, p->F)
959 #define PM(F, M) __PS(#F, p->F & (M))
960 #define __PSN(S, F) SEQ_printf(m, "%-45s:%14Ld.%06ld\n", S, SPLIT_NS((long long)(F)))
961 #define __PN(F) __PSN(#F, F)
962 #define PN(F) __PSN(#F, p->F)
965 #ifdef CONFIG_NUMA_BALANCING
966 void print_numa_stats(struct seq_file *m, int node, unsigned long tsf,
967 unsigned long tpf, unsigned long gsf, unsigned long gpf)
969 SEQ_printf(m, "numa_faults node=%d ", node);
970 SEQ_printf(m, "task_private=%lu task_shared=%lu ", tpf, tsf);
971 SEQ_printf(m, "group_private=%lu group_shared=%lu\n", gpf, gsf);
976 static void sched_show_numa(struct task_struct *p, struct seq_file *m)
978 #ifdef CONFIG_NUMA_BALANCING
980 P(mm->numa_scan_seq);
982 P(numa_pages_migrated);
983 P(numa_preferred_nid);
984 P(total_numa_faults);
985 SEQ_printf(m, "current_node=%d, numa_group_id=%d\n",
986 task_node(p), task_numa_group_id(p));
987 show_numa_stats(p, m);
991 void proc_sched_show_task(struct task_struct *p, struct pid_namespace *ns,
994 unsigned long nr_switches;
996 SEQ_printf(m, "%s (%d, #threads: %d)\n", p->comm, task_pid_nr_ns(p, ns),
999 "---------------------------------------------------------"
1002 #define P_SCHEDSTAT(F) __PS(#F, schedstat_val(p->stats.F))
1003 #define PN_SCHEDSTAT(F) __PSN(#F, schedstat_val(p->stats.F))
1007 PN(se.sum_exec_runtime);
1009 nr_switches = p->nvcsw + p->nivcsw;
1011 P(se.nr_migrations);
1013 if (schedstat_enabled()) {
1014 u64 avg_atom, avg_per_cpu;
1016 PN_SCHEDSTAT(sum_sleep_runtime);
1017 PN_SCHEDSTAT(sum_block_runtime);
1018 PN_SCHEDSTAT(wait_start);
1019 PN_SCHEDSTAT(sleep_start);
1020 PN_SCHEDSTAT(block_start);
1021 PN_SCHEDSTAT(sleep_max);
1022 PN_SCHEDSTAT(block_max);
1023 PN_SCHEDSTAT(exec_max);
1024 PN_SCHEDSTAT(slice_max);
1025 PN_SCHEDSTAT(wait_max);
1026 PN_SCHEDSTAT(wait_sum);
1027 P_SCHEDSTAT(wait_count);
1028 PN_SCHEDSTAT(iowait_sum);
1029 P_SCHEDSTAT(iowait_count);
1030 P_SCHEDSTAT(nr_migrations_cold);
1031 P_SCHEDSTAT(nr_failed_migrations_affine);
1032 P_SCHEDSTAT(nr_failed_migrations_running);
1033 P_SCHEDSTAT(nr_failed_migrations_hot);
1034 P_SCHEDSTAT(nr_forced_migrations);
1035 P_SCHEDSTAT(nr_wakeups);
1036 P_SCHEDSTAT(nr_wakeups_sync);
1037 P_SCHEDSTAT(nr_wakeups_migrate);
1038 P_SCHEDSTAT(nr_wakeups_local);
1039 P_SCHEDSTAT(nr_wakeups_remote);
1040 P_SCHEDSTAT(nr_wakeups_affine);
1041 P_SCHEDSTAT(nr_wakeups_affine_attempts);
1042 P_SCHEDSTAT(nr_wakeups_passive);
1043 P_SCHEDSTAT(nr_wakeups_idle);
1045 avg_atom = p->se.sum_exec_runtime;
1047 avg_atom = div64_ul(avg_atom, nr_switches);
1051 avg_per_cpu = p->se.sum_exec_runtime;
1052 if (p->se.nr_migrations) {
1053 avg_per_cpu = div64_u64(avg_per_cpu,
1054 p->se.nr_migrations);
1062 #ifdef CONFIG_SCHED_CORE
1063 PN_SCHEDSTAT(core_forceidle_sum);
1068 __PS("nr_voluntary_switches", p->nvcsw);
1069 __PS("nr_involuntary_switches", p->nivcsw);
1074 P(se.avg.runnable_sum);
1077 P(se.avg.runnable_avg);
1079 P(se.avg.last_update_time);
1080 P(se.avg.util_est.ewma);
1081 PM(se.avg.util_est.enqueued, ~UTIL_AVG_UNCHANGED);
1083 #ifdef CONFIG_UCLAMP_TASK
1084 __PS("uclamp.min", p->uclamp_req[UCLAMP_MIN].value);
1085 __PS("uclamp.max", p->uclamp_req[UCLAMP_MAX].value);
1086 __PS("effective uclamp.min", uclamp_eff_value(p, UCLAMP_MIN));
1087 __PS("effective uclamp.max", uclamp_eff_value(p, UCLAMP_MAX));
1091 if (task_has_dl_policy(p)) {
1099 unsigned int this_cpu = raw_smp_processor_id();
1102 t0 = cpu_clock(this_cpu);
1103 t1 = cpu_clock(this_cpu);
1104 __PS("clock-delta", t1-t0);
1107 sched_show_numa(p, m);
1110 void proc_sched_set_task(struct task_struct *p)
1112 #ifdef CONFIG_SCHEDSTATS
1113 memset(&p->stats, 0, sizeof(p->stats));
1117 void resched_latency_warn(int cpu, u64 latency)
1119 static DEFINE_RATELIMIT_STATE(latency_check_ratelimit, 60 * 60 * HZ, 1);
1121 WARN(__ratelimit(&latency_check_ratelimit),
1122 "sched: CPU %d need_resched set for > %llu ns (%d ticks) "
1123 "without schedule\n",
1124 cpu, latency, cpu_rq(cpu)->ticks_without_resched);