Line data Source code
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 /proc/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 0 : if ((long long)nsec < 0) {
28 0 : nsec = -nsec;
29 0 : do_div(nsec, 1000000);
30 0 : return -nsec;
31 : }
32 0 : do_div(nsec, 1000000);
33 :
34 0 : return nsec;
35 : }
36 :
37 : static unsigned long nsec_low(unsigned long long nsec)
38 : {
39 0 : if ((long long)nsec < 0)
40 0 : nsec = -nsec;
41 :
42 0 : 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 : static const struct seq_operations sched_debug_sops;
284 :
285 : static int sched_debug_open(struct inode *inode, struct file *filp)
286 : {
287 : return seq_open(filp, &sched_debug_sops);
288 : }
289 :
290 : static const struct file_operations sched_debug_fops = {
291 : .open = sched_debug_open,
292 : .read = seq_read,
293 : .llseek = seq_lseek,
294 : .release = seq_release,
295 : };
296 :
297 : static struct dentry *debugfs_sched;
298 :
299 1 : static __init int sched_init_debug(void)
300 : {
301 : struct dentry __maybe_unused *numa;
302 :
303 2 : debugfs_sched = debugfs_create_dir("sched", NULL);
304 :
305 2 : debugfs_create_file("features", 0644, debugfs_sched, NULL, &sched_feat_fops);
306 1 : debugfs_create_bool("verbose", 0644, debugfs_sched, &sched_debug_verbose);
307 : #ifdef CONFIG_PREEMPT_DYNAMIC
308 : debugfs_create_file("preempt", 0644, debugfs_sched, NULL, &sched_dynamic_fops);
309 : #endif
310 :
311 1 : debugfs_create_u32("latency_ns", 0644, debugfs_sched, &sysctl_sched_latency);
312 1 : debugfs_create_u32("min_granularity_ns", 0644, debugfs_sched, &sysctl_sched_min_granularity);
313 1 : debugfs_create_u32("idle_min_granularity_ns", 0644, debugfs_sched, &sysctl_sched_idle_min_granularity);
314 1 : debugfs_create_u32("wakeup_granularity_ns", 0644, debugfs_sched, &sysctl_sched_wakeup_granularity);
315 :
316 1 : debugfs_create_u32("latency_warn_ms", 0644, debugfs_sched, &sysctl_resched_latency_warn_ms);
317 1 : debugfs_create_u32("latency_warn_once", 0644, debugfs_sched, &sysctl_resched_latency_warn_once);
318 :
319 : #ifdef CONFIG_SMP
320 : debugfs_create_file("tunable_scaling", 0644, debugfs_sched, NULL, &sched_scaling_fops);
321 : debugfs_create_u32("migration_cost_ns", 0644, debugfs_sched, &sysctl_sched_migration_cost);
322 : debugfs_create_u32("nr_migrate", 0644, debugfs_sched, &sysctl_sched_nr_migrate);
323 :
324 : mutex_lock(&sched_domains_mutex);
325 : update_sched_domain_debugfs();
326 : mutex_unlock(&sched_domains_mutex);
327 : #endif
328 :
329 : #ifdef CONFIG_NUMA_BALANCING
330 : numa = debugfs_create_dir("numa_balancing", debugfs_sched);
331 :
332 : debugfs_create_u32("scan_delay_ms", 0644, numa, &sysctl_numa_balancing_scan_delay);
333 : debugfs_create_u32("scan_period_min_ms", 0644, numa, &sysctl_numa_balancing_scan_period_min);
334 : debugfs_create_u32("scan_period_max_ms", 0644, numa, &sysctl_numa_balancing_scan_period_max);
335 : debugfs_create_u32("scan_size_mb", 0644, numa, &sysctl_numa_balancing_scan_size);
336 : debugfs_create_u32("hot_threshold_ms", 0644, numa, &sysctl_numa_balancing_hot_threshold);
337 : #endif
338 :
339 2 : debugfs_create_file("debug", 0444, debugfs_sched, NULL, &sched_debug_fops);
340 :
341 1 : return 0;
342 : }
343 : late_initcall(sched_init_debug);
344 :
345 : #ifdef CONFIG_SMP
346 :
347 : static cpumask_var_t sd_sysctl_cpus;
348 : static struct dentry *sd_dentry;
349 :
350 : static int sd_flags_show(struct seq_file *m, void *v)
351 : {
352 : unsigned long flags = *(unsigned int *)m->private;
353 : int idx;
354 :
355 : for_each_set_bit(idx, &flags, __SD_FLAG_CNT) {
356 : seq_puts(m, sd_flag_debug[idx].name);
357 : seq_puts(m, " ");
358 : }
359 : seq_puts(m, "\n");
360 :
361 : return 0;
362 : }
363 :
364 : static int sd_flags_open(struct inode *inode, struct file *file)
365 : {
366 : return single_open(file, sd_flags_show, inode->i_private);
367 : }
368 :
369 : static const struct file_operations sd_flags_fops = {
370 : .open = sd_flags_open,
371 : .read = seq_read,
372 : .llseek = seq_lseek,
373 : .release = single_release,
374 : };
375 :
376 : static void register_sd(struct sched_domain *sd, struct dentry *parent)
377 : {
378 : #define SDM(type, mode, member) \
379 : debugfs_create_##type(#member, mode, parent, &sd->member)
380 :
381 : SDM(ulong, 0644, min_interval);
382 : SDM(ulong, 0644, max_interval);
383 : SDM(u64, 0644, max_newidle_lb_cost);
384 : SDM(u32, 0644, busy_factor);
385 : SDM(u32, 0644, imbalance_pct);
386 : SDM(u32, 0644, cache_nice_tries);
387 : SDM(str, 0444, name);
388 :
389 : #undef SDM
390 :
391 : debugfs_create_file("flags", 0444, parent, &sd->flags, &sd_flags_fops);
392 : }
393 :
394 : void update_sched_domain_debugfs(void)
395 : {
396 : int cpu, i;
397 :
398 : /*
399 : * This can unfortunately be invoked before sched_debug_init() creates
400 : * the debug directory. Don't touch sd_sysctl_cpus until then.
401 : */
402 : if (!debugfs_sched)
403 : return;
404 :
405 : if (!cpumask_available(sd_sysctl_cpus)) {
406 : if (!alloc_cpumask_var(&sd_sysctl_cpus, GFP_KERNEL))
407 : return;
408 : cpumask_copy(sd_sysctl_cpus, cpu_possible_mask);
409 : }
410 :
411 : if (!sd_dentry)
412 : sd_dentry = debugfs_create_dir("domains", debugfs_sched);
413 :
414 : for_each_cpu(cpu, sd_sysctl_cpus) {
415 : struct sched_domain *sd;
416 : struct dentry *d_cpu;
417 : char buf[32];
418 :
419 : snprintf(buf, sizeof(buf), "cpu%d", cpu);
420 : debugfs_lookup_and_remove(buf, sd_dentry);
421 : d_cpu = debugfs_create_dir(buf, sd_dentry);
422 :
423 : i = 0;
424 : for_each_domain(cpu, sd) {
425 : struct dentry *d_sd;
426 :
427 : snprintf(buf, sizeof(buf), "domain%d", i);
428 : d_sd = debugfs_create_dir(buf, d_cpu);
429 :
430 : register_sd(sd, d_sd);
431 : i++;
432 : }
433 :
434 : __cpumask_clear_cpu(cpu, sd_sysctl_cpus);
435 : }
436 : }
437 :
438 : void dirty_sched_domain_sysctl(int cpu)
439 : {
440 : if (cpumask_available(sd_sysctl_cpus))
441 : __cpumask_set_cpu(cpu, sd_sysctl_cpus);
442 : }
443 :
444 : #endif /* CONFIG_SMP */
445 :
446 : #ifdef CONFIG_FAIR_GROUP_SCHED
447 : static void print_cfs_group_stats(struct seq_file *m, int cpu, struct task_group *tg)
448 : {
449 : struct sched_entity *se = tg->se[cpu];
450 :
451 : #define P(F) SEQ_printf(m, " .%-30s: %lld\n", #F, (long long)F)
452 : #define P_SCHEDSTAT(F) SEQ_printf(m, " .%-30s: %lld\n", \
453 : #F, (long long)schedstat_val(stats->F))
454 : #define PN(F) SEQ_printf(m, " .%-30s: %lld.%06ld\n", #F, SPLIT_NS((long long)F))
455 : #define PN_SCHEDSTAT(F) SEQ_printf(m, " .%-30s: %lld.%06ld\n", \
456 : #F, SPLIT_NS((long long)schedstat_val(stats->F)))
457 :
458 : if (!se)
459 : return;
460 :
461 : PN(se->exec_start);
462 : PN(se->vruntime);
463 : PN(se->sum_exec_runtime);
464 :
465 : if (schedstat_enabled()) {
466 : struct sched_statistics *stats;
467 : stats = __schedstats_from_se(se);
468 :
469 : PN_SCHEDSTAT(wait_start);
470 : PN_SCHEDSTAT(sleep_start);
471 : PN_SCHEDSTAT(block_start);
472 : PN_SCHEDSTAT(sleep_max);
473 : PN_SCHEDSTAT(block_max);
474 : PN_SCHEDSTAT(exec_max);
475 : PN_SCHEDSTAT(slice_max);
476 : PN_SCHEDSTAT(wait_max);
477 : PN_SCHEDSTAT(wait_sum);
478 : P_SCHEDSTAT(wait_count);
479 : }
480 :
481 : P(se->load.weight);
482 : #ifdef CONFIG_SMP
483 : P(se->avg.load_avg);
484 : P(se->avg.util_avg);
485 : P(se->avg.runnable_avg);
486 : #endif
487 :
488 : #undef PN_SCHEDSTAT
489 : #undef PN
490 : #undef P_SCHEDSTAT
491 : #undef P
492 : }
493 : #endif
494 :
495 : #ifdef CONFIG_CGROUP_SCHED
496 : static DEFINE_SPINLOCK(sched_debug_lock);
497 : static char group_path[PATH_MAX];
498 :
499 : static void task_group_path(struct task_group *tg, char *path, int plen)
500 : {
501 : if (autogroup_path(tg, path, plen))
502 : return;
503 :
504 : cgroup_path(tg->css.cgroup, path, plen);
505 : }
506 :
507 : /*
508 : * Only 1 SEQ_printf_task_group_path() caller can use the full length
509 : * group_path[] for cgroup path. Other simultaneous callers will have
510 : * to use a shorter stack buffer. A "..." suffix is appended at the end
511 : * of the stack buffer so that it will show up in case the output length
512 : * matches the given buffer size to indicate possible path name truncation.
513 : */
514 : #define SEQ_printf_task_group_path(m, tg, fmt...) \
515 : { \
516 : if (spin_trylock(&sched_debug_lock)) { \
517 : task_group_path(tg, group_path, sizeof(group_path)); \
518 : SEQ_printf(m, fmt, group_path); \
519 : spin_unlock(&sched_debug_lock); \
520 : } else { \
521 : char buf[128]; \
522 : char *bufend = buf + sizeof(buf) - 3; \
523 : task_group_path(tg, buf, bufend - buf); \
524 : strcpy(bufend - 1, "..."); \
525 : SEQ_printf(m, fmt, buf); \
526 : } \
527 : }
528 : #endif
529 :
530 : static void
531 0 : print_task(struct seq_file *m, struct rq *rq, struct task_struct *p)
532 : {
533 0 : if (task_current(rq, p))
534 0 : SEQ_printf(m, ">R");
535 : else
536 0 : SEQ_printf(m, " %c", task_state_to_char(p));
537 :
538 0 : SEQ_printf(m, " %15s %5d %9Ld.%06ld %9Ld %5d ",
539 : p->comm, task_pid_nr(p),
540 : SPLIT_NS(p->se.vruntime),
541 : (long long)(p->nvcsw + p->nivcsw),
542 : p->prio);
543 :
544 0 : SEQ_printf(m, "%9lld.%06ld %9lld.%06ld %9lld.%06ld %9lld.%06ld",
545 : SPLIT_NS(schedstat_val_or_zero(p->stats.wait_sum)),
546 : SPLIT_NS(p->se.sum_exec_runtime),
547 : SPLIT_NS(schedstat_val_or_zero(p->stats.sum_sleep_runtime)),
548 : SPLIT_NS(schedstat_val_or_zero(p->stats.sum_block_runtime)));
549 :
550 : #ifdef CONFIG_NUMA_BALANCING
551 : SEQ_printf(m, " %d %d", task_node(p), task_numa_group_id(p));
552 : #endif
553 : #ifdef CONFIG_CGROUP_SCHED
554 : SEQ_printf_task_group_path(m, task_group(p), " %s")
555 : #endif
556 :
557 0 : SEQ_printf(m, "\n");
558 0 : }
559 :
560 0 : static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu)
561 : {
562 : struct task_struct *g, *p;
563 :
564 0 : SEQ_printf(m, "\n");
565 0 : SEQ_printf(m, "runnable tasks:\n");
566 0 : SEQ_printf(m, " S task PID tree-key switches prio"
567 : " wait-time sum-exec sum-sleep\n");
568 0 : SEQ_printf(m, "-------------------------------------------------------"
569 : "------------------------------------------------------\n");
570 :
571 : rcu_read_lock();
572 0 : for_each_process_thread(g, p) {
573 0 : if (task_cpu(p) != rq_cpu)
574 0 : continue;
575 :
576 0 : print_task(m, rq, p);
577 : }
578 : rcu_read_unlock();
579 0 : }
580 :
581 0 : void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
582 : {
583 0 : s64 MIN_vruntime = -1, min_vruntime, max_vruntime = -1,
584 : spread, rq0_min_vruntime, spread0;
585 0 : struct rq *rq = cpu_rq(cpu);
586 : struct sched_entity *last;
587 : unsigned long flags;
588 :
589 : #ifdef CONFIG_FAIR_GROUP_SCHED
590 : SEQ_printf(m, "\n");
591 : SEQ_printf_task_group_path(m, cfs_rq->tg, "cfs_rq[%d]:%s\n", cpu);
592 : #else
593 0 : SEQ_printf(m, "\n");
594 0 : SEQ_printf(m, "cfs_rq[%d]:\n", cpu);
595 : #endif
596 0 : SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "exec_clock",
597 : SPLIT_NS(cfs_rq->exec_clock));
598 :
599 0 : raw_spin_rq_lock_irqsave(rq, flags);
600 0 : if (rb_first_cached(&cfs_rq->tasks_timeline))
601 0 : MIN_vruntime = (__pick_first_entity(cfs_rq))->vruntime;
602 0 : last = __pick_last_entity(cfs_rq);
603 0 : if (last)
604 0 : max_vruntime = last->vruntime;
605 0 : min_vruntime = cfs_rq->min_vruntime;
606 0 : rq0_min_vruntime = cpu_rq(0)->cfs.min_vruntime;
607 0 : raw_spin_rq_unlock_irqrestore(rq, flags);
608 0 : SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "MIN_vruntime",
609 : SPLIT_NS(MIN_vruntime));
610 0 : SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "min_vruntime",
611 : SPLIT_NS(min_vruntime));
612 0 : SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "max_vruntime",
613 : SPLIT_NS(max_vruntime));
614 0 : spread = max_vruntime - MIN_vruntime;
615 0 : SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "spread",
616 : SPLIT_NS(spread));
617 0 : spread0 = min_vruntime - rq0_min_vruntime;
618 0 : SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "spread0",
619 : SPLIT_NS(spread0));
620 0 : SEQ_printf(m, " .%-30s: %d\n", "nr_spread_over",
621 : cfs_rq->nr_spread_over);
622 0 : SEQ_printf(m, " .%-30s: %d\n", "nr_running", cfs_rq->nr_running);
623 0 : SEQ_printf(m, " .%-30s: %d\n", "h_nr_running", cfs_rq->h_nr_running);
624 0 : SEQ_printf(m, " .%-30s: %d\n", "idle_nr_running",
625 : cfs_rq->idle_nr_running);
626 0 : SEQ_printf(m, " .%-30s: %d\n", "idle_h_nr_running",
627 : cfs_rq->idle_h_nr_running);
628 0 : SEQ_printf(m, " .%-30s: %ld\n", "load", cfs_rq->load.weight);
629 : #ifdef CONFIG_SMP
630 : SEQ_printf(m, " .%-30s: %lu\n", "load_avg",
631 : cfs_rq->avg.load_avg);
632 : SEQ_printf(m, " .%-30s: %lu\n", "runnable_avg",
633 : cfs_rq->avg.runnable_avg);
634 : SEQ_printf(m, " .%-30s: %lu\n", "util_avg",
635 : cfs_rq->avg.util_avg);
636 : SEQ_printf(m, " .%-30s: %u\n", "util_est_enqueued",
637 : cfs_rq->avg.util_est.enqueued);
638 : SEQ_printf(m, " .%-30s: %ld\n", "removed.load_avg",
639 : cfs_rq->removed.load_avg);
640 : SEQ_printf(m, " .%-30s: %ld\n", "removed.util_avg",
641 : cfs_rq->removed.util_avg);
642 : SEQ_printf(m, " .%-30s: %ld\n", "removed.runnable_avg",
643 : cfs_rq->removed.runnable_avg);
644 : #ifdef CONFIG_FAIR_GROUP_SCHED
645 : SEQ_printf(m, " .%-30s: %lu\n", "tg_load_avg_contrib",
646 : cfs_rq->tg_load_avg_contrib);
647 : SEQ_printf(m, " .%-30s: %ld\n", "tg_load_avg",
648 : atomic_long_read(&cfs_rq->tg->load_avg));
649 : #endif
650 : #endif
651 : #ifdef CONFIG_CFS_BANDWIDTH
652 : SEQ_printf(m, " .%-30s: %d\n", "throttled",
653 : cfs_rq->throttled);
654 : SEQ_printf(m, " .%-30s: %d\n", "throttle_count",
655 : cfs_rq->throttle_count);
656 : #endif
657 :
658 : #ifdef CONFIG_FAIR_GROUP_SCHED
659 : print_cfs_group_stats(m, cpu, cfs_rq->tg);
660 : #endif
661 0 : }
662 :
663 0 : void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq)
664 : {
665 : #ifdef CONFIG_RT_GROUP_SCHED
666 : SEQ_printf(m, "\n");
667 : SEQ_printf_task_group_path(m, rt_rq->tg, "rt_rq[%d]:%s\n", cpu);
668 : #else
669 0 : SEQ_printf(m, "\n");
670 0 : SEQ_printf(m, "rt_rq[%d]:\n", cpu);
671 : #endif
672 :
673 : #define P(x) \
674 : SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rt_rq->x))
675 : #define PU(x) \
676 : SEQ_printf(m, " .%-30s: %lu\n", #x, (unsigned long)(rt_rq->x))
677 : #define PN(x) \
678 : SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rt_rq->x))
679 :
680 0 : PU(rt_nr_running);
681 : #ifdef CONFIG_SMP
682 : PU(rt_nr_migratory);
683 : #endif
684 0 : P(rt_throttled);
685 0 : PN(rt_time);
686 0 : PN(rt_runtime);
687 :
688 : #undef PN
689 : #undef PU
690 : #undef P
691 0 : }
692 :
693 0 : void print_dl_rq(struct seq_file *m, int cpu, struct dl_rq *dl_rq)
694 : {
695 : struct dl_bw *dl_bw;
696 :
697 0 : SEQ_printf(m, "\n");
698 0 : SEQ_printf(m, "dl_rq[%d]:\n", cpu);
699 :
700 : #define PU(x) \
701 : SEQ_printf(m, " .%-30s: %lu\n", #x, (unsigned long)(dl_rq->x))
702 :
703 0 : PU(dl_nr_running);
704 : #ifdef CONFIG_SMP
705 : PU(dl_nr_migratory);
706 : dl_bw = &cpu_rq(cpu)->rd->dl_bw;
707 : #else
708 0 : dl_bw = &dl_rq->dl_bw;
709 : #endif
710 0 : SEQ_printf(m, " .%-30s: %lld\n", "dl_bw->bw", dl_bw->bw);
711 0 : SEQ_printf(m, " .%-30s: %lld\n", "dl_bw->total_bw", dl_bw->total_bw);
712 :
713 : #undef PU
714 0 : }
715 :
716 0 : static void print_cpu(struct seq_file *m, int cpu)
717 : {
718 0 : struct rq *rq = cpu_rq(cpu);
719 :
720 : #ifdef CONFIG_X86
721 : {
722 : unsigned int freq = cpu_khz ? : 1;
723 :
724 : SEQ_printf(m, "cpu#%d, %u.%03u MHz\n",
725 : cpu, freq / 1000, (freq % 1000));
726 : }
727 : #else
728 0 : SEQ_printf(m, "cpu#%d\n", cpu);
729 : #endif
730 :
731 : #define P(x) \
732 : do { \
733 : if (sizeof(rq->x) == 4) \
734 : SEQ_printf(m, " .%-30s: %ld\n", #x, (long)(rq->x)); \
735 : else \
736 : SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rq->x));\
737 : } while (0)
738 :
739 : #define PN(x) \
740 : SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rq->x))
741 :
742 0 : P(nr_running);
743 0 : P(nr_switches);
744 0 : P(nr_uninterruptible);
745 0 : PN(next_balance);
746 0 : SEQ_printf(m, " .%-30s: %ld\n", "curr->pid", (long)(task_pid_nr(rq->curr)));
747 0 : PN(clock);
748 0 : PN(clock_task);
749 : #undef P
750 : #undef PN
751 :
752 : #ifdef CONFIG_SMP
753 : #define P64(n) SEQ_printf(m, " .%-30s: %Ld\n", #n, rq->n);
754 : P64(avg_idle);
755 : P64(max_idle_balance_cost);
756 : #undef P64
757 : #endif
758 :
759 : #define P(n) SEQ_printf(m, " .%-30s: %d\n", #n, schedstat_val(rq->n));
760 : if (schedstat_enabled()) {
761 : P(yld_count);
762 : P(sched_count);
763 : P(sched_goidle);
764 : P(ttwu_count);
765 : P(ttwu_local);
766 : }
767 : #undef P
768 :
769 0 : print_cfs_stats(m, cpu);
770 0 : print_rt_stats(m, cpu);
771 0 : print_dl_stats(m, cpu);
772 :
773 0 : print_rq(m, rq, cpu);
774 0 : SEQ_printf(m, "\n");
775 0 : }
776 :
777 : static const char *sched_tunable_scaling_names[] = {
778 : "none",
779 : "logarithmic",
780 : "linear"
781 : };
782 :
783 0 : static void sched_debug_header(struct seq_file *m)
784 : {
785 : u64 ktime, sched_clk, cpu_clk;
786 : unsigned long flags;
787 :
788 0 : local_irq_save(flags);
789 0 : ktime = ktime_to_ns(ktime_get());
790 0 : sched_clk = sched_clock();
791 0 : cpu_clk = local_clock();
792 0 : local_irq_restore(flags);
793 :
794 0 : SEQ_printf(m, "Sched Debug Version: v0.11, %s %.*s\n",
795 : init_utsname()->release,
796 : (int)strcspn(init_utsname()->version, " "),
797 : init_utsname()->version);
798 :
799 : #define P(x) \
800 : SEQ_printf(m, "%-40s: %Ld\n", #x, (long long)(x))
801 : #define PN(x) \
802 : SEQ_printf(m, "%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x))
803 0 : PN(ktime);
804 0 : PN(sched_clk);
805 0 : PN(cpu_clk);
806 0 : P(jiffies);
807 : #ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
808 : P(sched_clock_stable());
809 : #endif
810 : #undef PN
811 : #undef P
812 :
813 0 : SEQ_printf(m, "\n");
814 0 : SEQ_printf(m, "sysctl_sched\n");
815 :
816 : #define P(x) \
817 : SEQ_printf(m, " .%-40s: %Ld\n", #x, (long long)(x))
818 : #define PN(x) \
819 : SEQ_printf(m, " .%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x))
820 0 : PN(sysctl_sched_latency);
821 0 : PN(sysctl_sched_min_granularity);
822 0 : PN(sysctl_sched_idle_min_granularity);
823 0 : PN(sysctl_sched_wakeup_granularity);
824 0 : P(sysctl_sched_child_runs_first);
825 0 : P(sysctl_sched_features);
826 : #undef PN
827 : #undef P
828 :
829 0 : SEQ_printf(m, " .%-40s: %d (%s)\n",
830 : "sysctl_sched_tunable_scaling",
831 : sysctl_sched_tunable_scaling,
832 : sched_tunable_scaling_names[sysctl_sched_tunable_scaling]);
833 0 : SEQ_printf(m, "\n");
834 0 : }
835 :
836 : static int sched_debug_show(struct seq_file *m, void *v)
837 : {
838 : int cpu = (unsigned long)(v - 2);
839 :
840 : if (cpu != -1)
841 : print_cpu(m, cpu);
842 : else
843 : sched_debug_header(m);
844 :
845 : return 0;
846 : }
847 :
848 0 : void sysrq_sched_debug_show(void)
849 : {
850 : int cpu;
851 :
852 0 : sched_debug_header(NULL);
853 0 : for_each_online_cpu(cpu) {
854 : /*
855 : * Need to reset softlockup watchdogs on all CPUs, because
856 : * another CPU might be blocked waiting for us to process
857 : * an IPI or stop_machine.
858 : */
859 : touch_nmi_watchdog();
860 : touch_all_softlockup_watchdogs();
861 0 : print_cpu(NULL, cpu);
862 : }
863 0 : }
864 :
865 : /*
866 : * This iterator needs some explanation.
867 : * It returns 1 for the header position.
868 : * This means 2 is CPU 0.
869 : * In a hotplugged system some CPUs, including CPU 0, may be missing so we have
870 : * to use cpumask_* to iterate over the CPUs.
871 : */
872 : static void *sched_debug_start(struct seq_file *file, loff_t *offset)
873 : {
874 : unsigned long n = *offset;
875 :
876 : if (n == 0)
877 : return (void *) 1;
878 :
879 : n--;
880 :
881 : if (n > 0)
882 : n = cpumask_next(n - 1, cpu_online_mask);
883 : else
884 : n = cpumask_first(cpu_online_mask);
885 :
886 : *offset = n + 1;
887 :
888 : if (n < nr_cpu_ids)
889 : return (void *)(unsigned long)(n + 2);
890 :
891 : return NULL;
892 : }
893 :
894 : static void *sched_debug_next(struct seq_file *file, void *data, loff_t *offset)
895 : {
896 : (*offset)++;
897 : return sched_debug_start(file, offset);
898 : }
899 :
900 : static void sched_debug_stop(struct seq_file *file, void *data)
901 : {
902 : }
903 :
904 : static const struct seq_operations sched_debug_sops = {
905 : .start = sched_debug_start,
906 : .next = sched_debug_next,
907 : .stop = sched_debug_stop,
908 : .show = sched_debug_show,
909 : };
910 :
911 : #define __PS(S, F) SEQ_printf(m, "%-45s:%21Ld\n", S, (long long)(F))
912 : #define __P(F) __PS(#F, F)
913 : #define P(F) __PS(#F, p->F)
914 : #define PM(F, M) __PS(#F, p->F & (M))
915 : #define __PSN(S, F) SEQ_printf(m, "%-45s:%14Ld.%06ld\n", S, SPLIT_NS((long long)(F)))
916 : #define __PN(F) __PSN(#F, F)
917 : #define PN(F) __PSN(#F, p->F)
918 :
919 :
920 : #ifdef CONFIG_NUMA_BALANCING
921 : void print_numa_stats(struct seq_file *m, int node, unsigned long tsf,
922 : unsigned long tpf, unsigned long gsf, unsigned long gpf)
923 : {
924 : SEQ_printf(m, "numa_faults node=%d ", node);
925 : SEQ_printf(m, "task_private=%lu task_shared=%lu ", tpf, tsf);
926 : SEQ_printf(m, "group_private=%lu group_shared=%lu\n", gpf, gsf);
927 : }
928 : #endif
929 :
930 :
931 : static void sched_show_numa(struct task_struct *p, struct seq_file *m)
932 : {
933 : #ifdef CONFIG_NUMA_BALANCING
934 : if (p->mm)
935 : P(mm->numa_scan_seq);
936 :
937 : P(numa_pages_migrated);
938 : P(numa_preferred_nid);
939 : P(total_numa_faults);
940 : SEQ_printf(m, "current_node=%d, numa_group_id=%d\n",
941 : task_node(p), task_numa_group_id(p));
942 : show_numa_stats(p, m);
943 : #endif
944 : }
945 :
946 0 : void proc_sched_show_task(struct task_struct *p, struct pid_namespace *ns,
947 : struct seq_file *m)
948 : {
949 : unsigned long nr_switches;
950 :
951 0 : SEQ_printf(m, "%s (%d, #threads: %d)\n", p->comm, task_pid_nr_ns(p, ns),
952 : get_nr_threads(p));
953 0 : SEQ_printf(m,
954 : "---------------------------------------------------------"
955 : "----------\n");
956 :
957 : #define P_SCHEDSTAT(F) __PS(#F, schedstat_val(p->stats.F))
958 : #define PN_SCHEDSTAT(F) __PSN(#F, schedstat_val(p->stats.F))
959 :
960 0 : PN(se.exec_start);
961 0 : PN(se.vruntime);
962 0 : PN(se.sum_exec_runtime);
963 :
964 0 : nr_switches = p->nvcsw + p->nivcsw;
965 :
966 0 : P(se.nr_migrations);
967 :
968 : if (schedstat_enabled()) {
969 : u64 avg_atom, avg_per_cpu;
970 :
971 : PN_SCHEDSTAT(sum_sleep_runtime);
972 : PN_SCHEDSTAT(sum_block_runtime);
973 : PN_SCHEDSTAT(wait_start);
974 : PN_SCHEDSTAT(sleep_start);
975 : PN_SCHEDSTAT(block_start);
976 : PN_SCHEDSTAT(sleep_max);
977 : PN_SCHEDSTAT(block_max);
978 : PN_SCHEDSTAT(exec_max);
979 : PN_SCHEDSTAT(slice_max);
980 : PN_SCHEDSTAT(wait_max);
981 : PN_SCHEDSTAT(wait_sum);
982 : P_SCHEDSTAT(wait_count);
983 : PN_SCHEDSTAT(iowait_sum);
984 : P_SCHEDSTAT(iowait_count);
985 : P_SCHEDSTAT(nr_migrations_cold);
986 : P_SCHEDSTAT(nr_failed_migrations_affine);
987 : P_SCHEDSTAT(nr_failed_migrations_running);
988 : P_SCHEDSTAT(nr_failed_migrations_hot);
989 : P_SCHEDSTAT(nr_forced_migrations);
990 : P_SCHEDSTAT(nr_wakeups);
991 : P_SCHEDSTAT(nr_wakeups_sync);
992 : P_SCHEDSTAT(nr_wakeups_migrate);
993 : P_SCHEDSTAT(nr_wakeups_local);
994 : P_SCHEDSTAT(nr_wakeups_remote);
995 : P_SCHEDSTAT(nr_wakeups_affine);
996 : P_SCHEDSTAT(nr_wakeups_affine_attempts);
997 : P_SCHEDSTAT(nr_wakeups_passive);
998 : P_SCHEDSTAT(nr_wakeups_idle);
999 :
1000 : avg_atom = p->se.sum_exec_runtime;
1001 : if (nr_switches)
1002 : avg_atom = div64_ul(avg_atom, nr_switches);
1003 : else
1004 : avg_atom = -1LL;
1005 :
1006 : avg_per_cpu = p->se.sum_exec_runtime;
1007 : if (p->se.nr_migrations) {
1008 : avg_per_cpu = div64_u64(avg_per_cpu,
1009 : p->se.nr_migrations);
1010 : } else {
1011 : avg_per_cpu = -1LL;
1012 : }
1013 :
1014 : __PN(avg_atom);
1015 : __PN(avg_per_cpu);
1016 :
1017 : #ifdef CONFIG_SCHED_CORE
1018 : PN_SCHEDSTAT(core_forceidle_sum);
1019 : #endif
1020 : }
1021 :
1022 0 : __P(nr_switches);
1023 0 : __PS("nr_voluntary_switches", p->nvcsw);
1024 0 : __PS("nr_involuntary_switches", p->nivcsw);
1025 :
1026 0 : P(se.load.weight);
1027 : #ifdef CONFIG_SMP
1028 : P(se.avg.load_sum);
1029 : P(se.avg.runnable_sum);
1030 : P(se.avg.util_sum);
1031 : P(se.avg.load_avg);
1032 : P(se.avg.runnable_avg);
1033 : P(se.avg.util_avg);
1034 : P(se.avg.last_update_time);
1035 : P(se.avg.util_est.ewma);
1036 : PM(se.avg.util_est.enqueued, ~UTIL_AVG_UNCHANGED);
1037 : #endif
1038 : #ifdef CONFIG_UCLAMP_TASK
1039 : __PS("uclamp.min", p->uclamp_req[UCLAMP_MIN].value);
1040 : __PS("uclamp.max", p->uclamp_req[UCLAMP_MAX].value);
1041 : __PS("effective uclamp.min", uclamp_eff_value(p, UCLAMP_MIN));
1042 : __PS("effective uclamp.max", uclamp_eff_value(p, UCLAMP_MAX));
1043 : #endif
1044 0 : P(policy);
1045 0 : P(prio);
1046 0 : if (task_has_dl_policy(p)) {
1047 0 : P(dl.runtime);
1048 0 : P(dl.deadline);
1049 : }
1050 : #undef PN_SCHEDSTAT
1051 : #undef P_SCHEDSTAT
1052 :
1053 : {
1054 0 : unsigned int this_cpu = raw_smp_processor_id();
1055 : u64 t0, t1;
1056 :
1057 0 : t0 = cpu_clock(this_cpu);
1058 0 : t1 = cpu_clock(this_cpu);
1059 0 : __PS("clock-delta", t1-t0);
1060 : }
1061 :
1062 0 : sched_show_numa(p, m);
1063 0 : }
1064 :
1065 0 : void proc_sched_set_task(struct task_struct *p)
1066 : {
1067 : #ifdef CONFIG_SCHEDSTATS
1068 : memset(&p->stats, 0, sizeof(p->stats));
1069 : #endif
1070 0 : }
1071 :
1072 0 : void resched_latency_warn(int cpu, u64 latency)
1073 : {
1074 : static DEFINE_RATELIMIT_STATE(latency_check_ratelimit, 60 * 60 * HZ, 1);
1075 :
1076 0 : WARN(__ratelimit(&latency_check_ratelimit),
1077 : "sched: CPU %d need_resched set for > %llu ns (%d ticks) "
1078 : "without schedule\n",
1079 : cpu, latency, cpu_rq(cpu)->ticks_without_resched);
1080 0 : }
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