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