projects/linux·blob v4.14 · refs

1045 lines · 24.3 KiB

1/*
2 * kernel/sched/debug.c
3 *
4 * Print the CFS rbtree
5 *
6 * Copyright(C) 2007, Red Hat, Inc., Ingo Molnar
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13#include <linux/proc_fs.h>
14#include <linux/sched/mm.h>
15#include <linux/sched/task.h>
16#include <linux/seq_file.h>
17#include <linux/kallsyms.h>
18#include <linux/utsname.h>
19#include <linux/mempolicy.h>
20#include <linux/debugfs.h>
21
22#include "sched.h"
23
24static DEFINE_SPINLOCK(sched_debug_lock);
25
26/*
27 * This allows printing both to /proc/sched_debug and
28 * to the console
29 */
30#define SEQ_printf(m, x...) \
31 do { \
32 if (m) \
33 seq_printf(m, x); \
34 else \
35 printk(x); \
36 } while (0)
37
38/*
39 * Ease the printing of nsec fields:
40 */
41static long long nsec_high(unsigned long long nsec)
42{
43 if ((long long)nsec < 0) {
44 nsec = -nsec;
45 do_div(nsec, 1000000);
46 return -nsec;
47 }
48 do_div(nsec, 1000000);
49
50 return nsec;
51}
52
53static unsigned long nsec_low(unsigned long long nsec)
54{
55 if ((long long)nsec < 0)
56 nsec = -nsec;
57
58 return do_div(nsec, 1000000);
59}
60
61#define SPLIT_NS(x) nsec_high(x), nsec_low(x)
62
63#define SCHED_FEAT(name, enabled) \
64 #name ,
65
66static const char * const sched_feat_names[] = {
67#include "features.h"
68};
69
70#undef SCHED_FEAT
71
72static int sched_feat_show(struct seq_file *m, void *v)
73{
74 int i;
75
76 for (i = 0; i < __SCHED_FEAT_NR; i++) {
77 if (!(sysctl_sched_features & (1UL << i)))
78 seq_puts(m, "NO_");
79 seq_printf(m, "%s ", sched_feat_names[i]);
80 }
81 seq_puts(m, "\n");
82
83 return 0;
84}
85
86#ifdef HAVE_JUMP_LABEL
87
88#define jump_label_key__true STATIC_KEY_INIT_TRUE
89#define jump_label_key__false STATIC_KEY_INIT_FALSE
90
91#define SCHED_FEAT(name, enabled) \
92 jump_label_key__##enabled ,
93
94struct static_key sched_feat_keys[__SCHED_FEAT_NR] = {
95#include "features.h"
96};
97
98#undef SCHED_FEAT
99
100static void sched_feat_disable(int i)
101{
102 static_key_disable(&sched_feat_keys[i]);
103}
104
105static void sched_feat_enable(int i)
106{
107 static_key_enable(&sched_feat_keys[i]);
108}
109#else
110static void sched_feat_disable(int i) { };
111static void sched_feat_enable(int i) { };
112#endif /* HAVE_JUMP_LABEL */
113
114static int sched_feat_set(char *cmp)
115{
116 int i;
117 int neg = 0;
118
119 if (strncmp(cmp, "NO_", 3) == 0) {
120 neg = 1;
121 cmp += 3;
122 }
123
124 for (i = 0; i < __SCHED_FEAT_NR; i++) {
125 if (strcmp(cmp, sched_feat_names[i]) == 0) {
126 if (neg) {
127 sysctl_sched_features &= ~(1UL << i);
128 sched_feat_disable(i);
129 } else {
130 sysctl_sched_features |= (1UL << i);
131 sched_feat_enable(i);
132 }
133 break;
134 }
135 }
136
137 return i;
138}
139
140static ssize_t
141sched_feat_write(struct file *filp, const char __user *ubuf,
142 size_t cnt, loff_t *ppos)
143{
144 char buf[64];
145 char *cmp;
146 int i;
147 struct inode *inode;
148
149 if (cnt > 63)
150 cnt = 63;
151
152 if (copy_from_user(&buf, ubuf, cnt))
153 return -EFAULT;
154
155 buf[cnt] = 0;
156 cmp = strstrip(buf);
157
158 /* Ensure the static_key remains in a consistent state */
159 inode = file_inode(filp);
160 inode_lock(inode);
161 i = sched_feat_set(cmp);
162 inode_unlock(inode);
163 if (i == __SCHED_FEAT_NR)
164 return -EINVAL;
165
166 *ppos += cnt;
167
168 return cnt;
169}
170
171static int sched_feat_open(struct inode *inode, struct file *filp)
172{
173 return single_open(filp, sched_feat_show, NULL);
174}
175
176static const struct file_operations sched_feat_fops = {
177 .open = sched_feat_open,
178 .write = sched_feat_write,
179 .read = seq_read,
180 .llseek = seq_lseek,
181 .release = single_release,
182};
183
184__read_mostly bool sched_debug_enabled;
185
186static __init int sched_init_debug(void)
187{
188 debugfs_create_file("sched_features", 0644, NULL, NULL,
189 &sched_feat_fops);
190
191 debugfs_create_bool("sched_debug", 0644, NULL,
192 &sched_debug_enabled);
193
194 return 0;
195}
196late_initcall(sched_init_debug);
197
198#ifdef CONFIG_SMP
199
200#ifdef CONFIG_SYSCTL
201
202static struct ctl_table sd_ctl_dir[] = {
203 {
204 .procname = "sched_domain",
205 .mode = 0555,
206 },
207 {}
208};
209
210static struct ctl_table sd_ctl_root[] = {
211 {
212 .procname = "kernel",
213 .mode = 0555,
214 .child = sd_ctl_dir,
215 },
216 {}
217};
218
219static struct ctl_table *sd_alloc_ctl_entry(int n)
220{
221 struct ctl_table *entry =
222 kcalloc(n, sizeof(struct ctl_table), GFP_KERNEL);
223
224 return entry;
225}
226
227static void sd_free_ctl_entry(struct ctl_table **tablep)
228{
229 struct ctl_table *entry;
230
231 /*
232 * In the intermediate directories, both the child directory and
233 * procname are dynamically allocated and could fail but the mode
234 * will always be set. In the lowest directory the names are
235 * static strings and all have proc handlers.
236 */
237 for (entry = *tablep; entry->mode; entry++) {
238 if (entry->child)
239 sd_free_ctl_entry(&entry->child);
240 if (entry->proc_handler == NULL)
241 kfree(entry->procname);
242 }
243
244 kfree(*tablep);
245 *tablep = NULL;
246}
247
248static int min_load_idx = 0;
249static int max_load_idx = CPU_LOAD_IDX_MAX-1;
250
251static void
252set_table_entry(struct ctl_table *entry,
253 const char *procname, void *data, int maxlen,
254 umode_t mode, proc_handler *proc_handler,
255 bool load_idx)
256{
257 entry->procname = procname;
258 entry->data = data;
259 entry->maxlen = maxlen;
260 entry->mode = mode;
261 entry->proc_handler = proc_handler;
262
263 if (load_idx) {
264 entry->extra1 = &min_load_idx;
265 entry->extra2 = &max_load_idx;
266 }
267}
268
269static struct ctl_table *
270sd_alloc_ctl_domain_table(struct sched_domain *sd)
271{
272 struct ctl_table *table = sd_alloc_ctl_entry(14);
273
274 if (table == NULL)
275 return NULL;
276
277 set_table_entry(&table[0], "min_interval", &sd->min_interval,
278 sizeof(long), 0644, proc_doulongvec_minmax, false);
279 set_table_entry(&table[1], "max_interval", &sd->max_interval,
280 sizeof(long), 0644, proc_doulongvec_minmax, false);
281 set_table_entry(&table[2], "busy_idx", &sd->busy_idx,
282 sizeof(int), 0644, proc_dointvec_minmax, true);
283 set_table_entry(&table[3], "idle_idx", &sd->idle_idx,
284 sizeof(int), 0644, proc_dointvec_minmax, true);
285 set_table_entry(&table[4], "newidle_idx", &sd->newidle_idx,
286 sizeof(int), 0644, proc_dointvec_minmax, true);
287 set_table_entry(&table[5], "wake_idx", &sd->wake_idx,
288 sizeof(int), 0644, proc_dointvec_minmax, true);
289 set_table_entry(&table[6], "forkexec_idx", &sd->forkexec_idx,
290 sizeof(int), 0644, proc_dointvec_minmax, true);
291 set_table_entry(&table[7], "busy_factor", &sd->busy_factor,
292 sizeof(int), 0644, proc_dointvec_minmax, false);
293 set_table_entry(&table[8], "imbalance_pct", &sd->imbalance_pct,
294 sizeof(int), 0644, proc_dointvec_minmax, false);
295 set_table_entry(&table[9], "cache_nice_tries",
296 &sd->cache_nice_tries,
297 sizeof(int), 0644, proc_dointvec_minmax, false);
298 set_table_entry(&table[10], "flags", &sd->flags,
299 sizeof(int), 0644, proc_dointvec_minmax, false);
300 set_table_entry(&table[11], "max_newidle_lb_cost",
301 &sd->max_newidle_lb_cost,
302 sizeof(long), 0644, proc_doulongvec_minmax, false);
303 set_table_entry(&table[12], "name", sd->name,
304 CORENAME_MAX_SIZE, 0444, proc_dostring, false);
305 /* &table[13] is terminator */
306
307 return table;
308}
309
310static struct ctl_table *sd_alloc_ctl_cpu_table(int cpu)
311{
312 struct ctl_table *entry, *table;
313 struct sched_domain *sd;
314 int domain_num = 0, i;
315 char buf[32];
316
317 for_each_domain(cpu, sd)
318 domain_num++;
319 entry = table = sd_alloc_ctl_entry(domain_num + 1);
320 if (table == NULL)
321 return NULL;
322
323 i = 0;
324 for_each_domain(cpu, sd) {
325 snprintf(buf, 32, "domain%d", i);
326 entry->procname = kstrdup(buf, GFP_KERNEL);
327 entry->mode = 0555;
328 entry->child = sd_alloc_ctl_domain_table(sd);
329 entry++;
330 i++;
331 }
332 return table;
333}
334
335static cpumask_var_t sd_sysctl_cpus;
336static struct ctl_table_header *sd_sysctl_header;
337
338void register_sched_domain_sysctl(void)
339{
340 static struct ctl_table *cpu_entries;
341 static struct ctl_table **cpu_idx;
342 char buf[32];
343 int i;
344
345 if (!cpu_entries) {
346 cpu_entries = sd_alloc_ctl_entry(num_possible_cpus() + 1);
347 if (!cpu_entries)
348 return;
349
350 WARN_ON(sd_ctl_dir[0].child);
351 sd_ctl_dir[0].child = cpu_entries;
352 }
353
354 if (!cpu_idx) {
355 struct ctl_table *e = cpu_entries;
356
357 cpu_idx = kcalloc(nr_cpu_ids, sizeof(struct ctl_table*), GFP_KERNEL);
358 if (!cpu_idx)
359 return;
360
361 /* deal with sparse possible map */
362 for_each_possible_cpu(i) {
363 cpu_idx[i] = e;
364 e++;
365 }
366 }
367
368 if (!cpumask_available(sd_sysctl_cpus)) {
369 if (!alloc_cpumask_var(&sd_sysctl_cpus, GFP_KERNEL))
370 return;
371
372 /* init to possible to not have holes in @cpu_entries */
373 cpumask_copy(sd_sysctl_cpus, cpu_possible_mask);
374 }
375
376 for_each_cpu(i, sd_sysctl_cpus) {
377 struct ctl_table *e = cpu_idx[i];
378
379 if (e->child)
380 sd_free_ctl_entry(&e->child);
381
382 if (!e->procname) {
383 snprintf(buf, 32, "cpu%d", i);
384 e->procname = kstrdup(buf, GFP_KERNEL);
385 }
386 e->mode = 0555;
387 e->child = sd_alloc_ctl_cpu_table(i);
388
389 __cpumask_clear_cpu(i, sd_sysctl_cpus);
390 }
391
392 WARN_ON(sd_sysctl_header);
393 sd_sysctl_header = register_sysctl_table(sd_ctl_root);
394}
395
396void dirty_sched_domain_sysctl(int cpu)
397{
398 if (cpumask_available(sd_sysctl_cpus))
399 __cpumask_set_cpu(cpu, sd_sysctl_cpus);
400}
401
402/* may be called multiple times per register */
403void unregister_sched_domain_sysctl(void)
404{
405 unregister_sysctl_table(sd_sysctl_header);
406 sd_sysctl_header = NULL;
407}
408#endif /* CONFIG_SYSCTL */
409#endif /* CONFIG_SMP */
410
411#ifdef CONFIG_FAIR_GROUP_SCHED
412static void print_cfs_group_stats(struct seq_file *m, int cpu, struct task_group *tg)
413{
414 struct sched_entity *se = tg->se[cpu];
415
416#define P(F) \
417 SEQ_printf(m, " .%-30s: %lld\n", #F, (long long)F)
418#define P_SCHEDSTAT(F) \
419 SEQ_printf(m, " .%-30s: %lld\n", #F, (long long)schedstat_val(F))
420#define PN(F) \
421 SEQ_printf(m, " .%-30s: %lld.%06ld\n", #F, SPLIT_NS((long long)F))
422#define PN_SCHEDSTAT(F) \
423 SEQ_printf(m, " .%-30s: %lld.%06ld\n", #F, SPLIT_NS((long long)schedstat_val(F)))
424
425 if (!se)
426 return;
427
428 PN(se->exec_start);
429 PN(se->vruntime);
430 PN(se->sum_exec_runtime);
431 if (schedstat_enabled()) {
432 PN_SCHEDSTAT(se->statistics.wait_start);
433 PN_SCHEDSTAT(se->statistics.sleep_start);
434 PN_SCHEDSTAT(se->statistics.block_start);
435 PN_SCHEDSTAT(se->statistics.sleep_max);
436 PN_SCHEDSTAT(se->statistics.block_max);
437 PN_SCHEDSTAT(se->statistics.exec_max);
438 PN_SCHEDSTAT(se->statistics.slice_max);
439 PN_SCHEDSTAT(se->statistics.wait_max);
440 PN_SCHEDSTAT(se->statistics.wait_sum);
441 P_SCHEDSTAT(se->statistics.wait_count);
442 }
443 P(se->load.weight);
444#ifdef CONFIG_SMP
445 P(se->avg.load_avg);
446 P(se->avg.util_avg);
447#endif
448
449#undef PN_SCHEDSTAT
450#undef PN
451#undef P_SCHEDSTAT
452#undef P
453}
454#endif
455
456#ifdef CONFIG_CGROUP_SCHED
457static char group_path[PATH_MAX];
458
459static char *task_group_path(struct task_group *tg)
460{
461 if (autogroup_path(tg, group_path, PATH_MAX))
462 return group_path;
463
464 cgroup_path(tg->css.cgroup, group_path, PATH_MAX);
465 return group_path;
466}
467#endif
468
469static void
470print_task(struct seq_file *m, struct rq *rq, struct task_struct *p)
471{
472 if (rq->curr == p)
473 SEQ_printf(m, ">R");
474 else
475 SEQ_printf(m, " %c", task_state_to_char(p));
476
477 SEQ_printf(m, "%15s %5d %9Ld.%06ld %9Ld %5d ",
478 p->comm, task_pid_nr(p),
479 SPLIT_NS(p->se.vruntime),
480 (long long)(p->nvcsw + p->nivcsw),
481 p->prio);
482
483 SEQ_printf(m, "%9Ld.%06ld %9Ld.%06ld %9Ld.%06ld",
484 SPLIT_NS(schedstat_val_or_zero(p->se.statistics.wait_sum)),
485 SPLIT_NS(p->se.sum_exec_runtime),
486 SPLIT_NS(schedstat_val_or_zero(p->se.statistics.sum_sleep_runtime)));
487
488#ifdef CONFIG_NUMA_BALANCING
489 SEQ_printf(m, " %d %d", task_node(p), task_numa_group_id(p));
490#endif
491#ifdef CONFIG_CGROUP_SCHED
492 SEQ_printf(m, " %s", task_group_path(task_group(p)));
493#endif
494
495 SEQ_printf(m, "\n");
496}
497
498static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu)
499{
500 struct task_struct *g, *p;
501
502 SEQ_printf(m,
503 "\nrunnable tasks:\n"
504 " S task PID tree-key switches prio"
505 " wait-time sum-exec sum-sleep\n"
506 "-------------------------------------------------------"
507 "----------------------------------------------------\n");
508
509 rcu_read_lock();
510 for_each_process_thread(g, p) {
511 if (task_cpu(p) != rq_cpu)
512 continue;
513
514 print_task(m, rq, p);
515 }
516 rcu_read_unlock();
517}
518
519void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
520{
521 s64 MIN_vruntime = -1, min_vruntime, max_vruntime = -1,
522 spread, rq0_min_vruntime, spread0;
523 struct rq *rq = cpu_rq(cpu);
524 struct sched_entity *last;
525 unsigned long flags;
526
527#ifdef CONFIG_FAIR_GROUP_SCHED
528 SEQ_printf(m, "\ncfs_rq[%d]:%s\n", cpu, task_group_path(cfs_rq->tg));
529#else
530 SEQ_printf(m, "\ncfs_rq[%d]:\n", cpu);
531#endif
532 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "exec_clock",
533 SPLIT_NS(cfs_rq->exec_clock));
534
535 raw_spin_lock_irqsave(&rq->lock, flags);
536 if (rb_first_cached(&cfs_rq->tasks_timeline))
537 MIN_vruntime = (__pick_first_entity(cfs_rq))->vruntime;
538 last = __pick_last_entity(cfs_rq);
539 if (last)
540 max_vruntime = last->vruntime;
541 min_vruntime = cfs_rq->min_vruntime;
542 rq0_min_vruntime = cpu_rq(0)->cfs.min_vruntime;
543 raw_spin_unlock_irqrestore(&rq->lock, flags);
544 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "MIN_vruntime",
545 SPLIT_NS(MIN_vruntime));
546 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "min_vruntime",
547 SPLIT_NS(min_vruntime));
548 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "max_vruntime",
549 SPLIT_NS(max_vruntime));
550 spread = max_vruntime - MIN_vruntime;
551 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "spread",
552 SPLIT_NS(spread));
553 spread0 = min_vruntime - rq0_min_vruntime;
554 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "spread0",
555 SPLIT_NS(spread0));
556 SEQ_printf(m, " .%-30s: %d\n", "nr_spread_over",
557 cfs_rq->nr_spread_over);
558 SEQ_printf(m, " .%-30s: %d\n", "nr_running", cfs_rq->nr_running);
559 SEQ_printf(m, " .%-30s: %ld\n", "load", cfs_rq->load.weight);
560#ifdef CONFIG_SMP
561 SEQ_printf(m, " .%-30s: %lu\n", "load_avg",
562 cfs_rq->avg.load_avg);
563 SEQ_printf(m, " .%-30s: %lu\n", "runnable_load_avg",
564 cfs_rq->runnable_load_avg);
565 SEQ_printf(m, " .%-30s: %lu\n", "util_avg",
566 cfs_rq->avg.util_avg);
567 SEQ_printf(m, " .%-30s: %ld\n", "removed_load_avg",
568 atomic_long_read(&cfs_rq->removed_load_avg));
569 SEQ_printf(m, " .%-30s: %ld\n", "removed_util_avg",
570 atomic_long_read(&cfs_rq->removed_util_avg));
571#ifdef CONFIG_FAIR_GROUP_SCHED
572 SEQ_printf(m, " .%-30s: %lu\n", "tg_load_avg_contrib",
573 cfs_rq->tg_load_avg_contrib);
574 SEQ_printf(m, " .%-30s: %ld\n", "tg_load_avg",
575 atomic_long_read(&cfs_rq->tg->load_avg));
576#endif
577#endif
578#ifdef CONFIG_CFS_BANDWIDTH
579 SEQ_printf(m, " .%-30s: %d\n", "throttled",
580 cfs_rq->throttled);
581 SEQ_printf(m, " .%-30s: %d\n", "throttle_count",
582 cfs_rq->throttle_count);
583#endif
584
585#ifdef CONFIG_FAIR_GROUP_SCHED
586 print_cfs_group_stats(m, cpu, cfs_rq->tg);
587#endif
588}
589
590void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq)
591{
592#ifdef CONFIG_RT_GROUP_SCHED
593 SEQ_printf(m, "\nrt_rq[%d]:%s\n", cpu, task_group_path(rt_rq->tg));
594#else
595 SEQ_printf(m, "\nrt_rq[%d]:\n", cpu);
596#endif
597
598#define P(x) \
599 SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rt_rq->x))
600#define PU(x) \
601 SEQ_printf(m, " .%-30s: %lu\n", #x, (unsigned long)(rt_rq->x))
602#define PN(x) \
603 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rt_rq->x))
604
605 PU(rt_nr_running);
606#ifdef CONFIG_SMP
607 PU(rt_nr_migratory);
608#endif
609 P(rt_throttled);
610 PN(rt_time);
611 PN(rt_runtime);
612
613#undef PN
614#undef PU
615#undef P
616}
617
618void print_dl_rq(struct seq_file *m, int cpu, struct dl_rq *dl_rq)
619{
620 struct dl_bw *dl_bw;
621
622 SEQ_printf(m, "\ndl_rq[%d]:\n", cpu);
623
624#define PU(x) \
625 SEQ_printf(m, " .%-30s: %lu\n", #x, (unsigned long)(dl_rq->x))
626
627 PU(dl_nr_running);
628#ifdef CONFIG_SMP
629 PU(dl_nr_migratory);
630 dl_bw = &cpu_rq(cpu)->rd->dl_bw;
631#else
632 dl_bw = &dl_rq->dl_bw;
633#endif
634 SEQ_printf(m, " .%-30s: %lld\n", "dl_bw->bw", dl_bw->bw);
635 SEQ_printf(m, " .%-30s: %lld\n", "dl_bw->total_bw", dl_bw->total_bw);
636
637#undef PU
638}
639
640extern __read_mostly int sched_clock_running;
641
642static void print_cpu(struct seq_file *m, int cpu)
643{
644 struct rq *rq = cpu_rq(cpu);
645 unsigned long flags;
646
647#ifdef CONFIG_X86
648 {
649 unsigned int freq = cpu_khz ? : 1;
650
651 SEQ_printf(m, "cpu#%d, %u.%03u MHz\n",
652 cpu, freq / 1000, (freq % 1000));
653 }
654#else
655 SEQ_printf(m, "cpu#%d\n", cpu);
656#endif
657
658#define P(x) \
659do { \
660 if (sizeof(rq->x) == 4) \
661 SEQ_printf(m, " .%-30s: %ld\n", #x, (long)(rq->x)); \
662 else \
663 SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rq->x));\
664} while (0)
665
666#define PN(x) \
667 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rq->x))
668
669 P(nr_running);
670 SEQ_printf(m, " .%-30s: %lu\n", "load",
671 rq->load.weight);
672 P(nr_switches);
673 P(nr_load_updates);
674 P(nr_uninterruptible);
675 PN(next_balance);
676 SEQ_printf(m, " .%-30s: %ld\n", "curr->pid", (long)(task_pid_nr(rq->curr)));
677 PN(clock);
678 PN(clock_task);
679 P(cpu_load[0]);
680 P(cpu_load[1]);
681 P(cpu_load[2]);
682 P(cpu_load[3]);
683 P(cpu_load[4]);
684#undef P
685#undef PN
686
687#ifdef CONFIG_SMP
688#define P64(n) SEQ_printf(m, " .%-30s: %Ld\n", #n, rq->n);
689 P64(avg_idle);
690 P64(max_idle_balance_cost);
691#undef P64
692#endif
693
694#define P(n) SEQ_printf(m, " .%-30s: %d\n", #n, schedstat_val(rq->n));
695 if (schedstat_enabled()) {
696 P(yld_count);
697 P(sched_count);
698 P(sched_goidle);
699 P(ttwu_count);
700 P(ttwu_local);
701 }
702#undef P
703
704 spin_lock_irqsave(&sched_debug_lock, flags);
705 print_cfs_stats(m, cpu);
706 print_rt_stats(m, cpu);
707 print_dl_stats(m, cpu);
708
709 print_rq(m, rq, cpu);
710 spin_unlock_irqrestore(&sched_debug_lock, flags);
711 SEQ_printf(m, "\n");
712}
713
714static const char *sched_tunable_scaling_names[] = {
715 "none",
716 "logaritmic",
717 "linear"
718};
719
720static void sched_debug_header(struct seq_file *m)
721{
722 u64 ktime, sched_clk, cpu_clk;
723 unsigned long flags;
724
725 local_irq_save(flags);
726 ktime = ktime_to_ns(ktime_get());
727 sched_clk = sched_clock();
728 cpu_clk = local_clock();
729 local_irq_restore(flags);
730
731 SEQ_printf(m, "Sched Debug Version: v0.11, %s %.*s\n",
732 init_utsname()->release,
733 (int)strcspn(init_utsname()->version, " "),
734 init_utsname()->version);
735
736#define P(x) \
737 SEQ_printf(m, "%-40s: %Ld\n", #x, (long long)(x))
738#define PN(x) \
739 SEQ_printf(m, "%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x))
740 PN(ktime);
741 PN(sched_clk);
742 PN(cpu_clk);
743 P(jiffies);
744#ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
745 P(sched_clock_stable());
746#endif
747#undef PN
748#undef P
749
750 SEQ_printf(m, "\n");
751 SEQ_printf(m, "sysctl_sched\n");
752
753#define P(x) \
754 SEQ_printf(m, " .%-40s: %Ld\n", #x, (long long)(x))
755#define PN(x) \
756 SEQ_printf(m, " .%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x))
757 PN(sysctl_sched_latency);
758 PN(sysctl_sched_min_granularity);
759 PN(sysctl_sched_wakeup_granularity);
760 P(sysctl_sched_child_runs_first);
761 P(sysctl_sched_features);
762#undef PN
763#undef P
764
765 SEQ_printf(m, " .%-40s: %d (%s)\n",
766 "sysctl_sched_tunable_scaling",
767 sysctl_sched_tunable_scaling,
768 sched_tunable_scaling_names[sysctl_sched_tunable_scaling]);
769 SEQ_printf(m, "\n");
770}
771
772static int sched_debug_show(struct seq_file *m, void *v)
773{
774 int cpu = (unsigned long)(v - 2);
775
776 if (cpu != -1)
777 print_cpu(m, cpu);
778 else
779 sched_debug_header(m);
780
781 return 0;
782}
783
784void sysrq_sched_debug_show(void)
785{
786 int cpu;
787
788 sched_debug_header(NULL);
789 for_each_online_cpu(cpu)
790 print_cpu(NULL, cpu);
791
792}
793
794/*
795 * This itererator needs some explanation.
796 * It returns 1 for the header position.
797 * This means 2 is cpu 0.
798 * In a hotplugged system some cpus, including cpu 0, may be missing so we have
799 * to use cpumask_* to iterate over the cpus.
800 */
801static void *sched_debug_start(struct seq_file *file, loff_t *offset)
802{
803 unsigned long n = *offset;
804
805 if (n == 0)
806 return (void *) 1;
807
808 n--;
809
810 if (n > 0)
811 n = cpumask_next(n - 1, cpu_online_mask);
812 else
813 n = cpumask_first(cpu_online_mask);
814
815 *offset = n + 1;
816
817 if (n < nr_cpu_ids)
818 return (void *)(unsigned long)(n + 2);
819 return NULL;
820}
821
822static void *sched_debug_next(struct seq_file *file, void *data, loff_t *offset)
823{
824 (*offset)++;
825 return sched_debug_start(file, offset);
826}
827
828static void sched_debug_stop(struct seq_file *file, void *data)
829{
830}
831
832static const struct seq_operations sched_debug_sops = {
833 .start = sched_debug_start,
834 .next = sched_debug_next,
835 .stop = sched_debug_stop,
836 .show = sched_debug_show,
837};
838
839static int sched_debug_release(struct inode *inode, struct file *file)
840{
841 seq_release(inode, file);
842
843 return 0;
844}
845
846static int sched_debug_open(struct inode *inode, struct file *filp)
847{
848 int ret = 0;
849
850 ret = seq_open(filp, &sched_debug_sops);
851
852 return ret;
853}
854
855static const struct file_operations sched_debug_fops = {
856 .open = sched_debug_open,
857 .read = seq_read,
858 .llseek = seq_lseek,
859 .release = sched_debug_release,
860};
861
862static int __init init_sched_debug_procfs(void)
863{
864 struct proc_dir_entry *pe;
865
866 pe = proc_create("sched_debug", 0444, NULL, &sched_debug_fops);
867 if (!pe)
868 return -ENOMEM;
869 return 0;
870}
871
872__initcall(init_sched_debug_procfs);
873
874#define __P(F) \
875 SEQ_printf(m, "%-45s:%21Ld\n", #F, (long long)F)
876#define P(F) \
877 SEQ_printf(m, "%-45s:%21Ld\n", #F, (long long)p->F)
878#define __PN(F) \
879 SEQ_printf(m, "%-45s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)F))
880#define PN(F) \
881 SEQ_printf(m, "%-45s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)p->F))
882
883
884#ifdef CONFIG_NUMA_BALANCING
885void print_numa_stats(struct seq_file *m, int node, unsigned long tsf,
886 unsigned long tpf, unsigned long gsf, unsigned long gpf)
887{
888 SEQ_printf(m, "numa_faults node=%d ", node);
889 SEQ_printf(m, "task_private=%lu task_shared=%lu ", tsf, tpf);
890 SEQ_printf(m, "group_private=%lu group_shared=%lu\n", gsf, gpf);
891}
892#endif
893
894
895static void sched_show_numa(struct task_struct *p, struct seq_file *m)
896{
897#ifdef CONFIG_NUMA_BALANCING
898 struct mempolicy *pol;
899
900 if (p->mm)
901 P(mm->numa_scan_seq);
902
903 task_lock(p);
904 pol = p->mempolicy;
905 if (pol && !(pol->flags & MPOL_F_MORON))
906 pol = NULL;
907 mpol_get(pol);
908 task_unlock(p);
909
910 P(numa_pages_migrated);
911 P(numa_preferred_nid);
912 P(total_numa_faults);
913 SEQ_printf(m, "current_node=%d, numa_group_id=%d\n",
914 task_node(p), task_numa_group_id(p));
915 show_numa_stats(p, m);
916 mpol_put(pol);
917#endif
918}
919
920void proc_sched_show_task(struct task_struct *p, struct pid_namespace *ns,
921 struct seq_file *m)
922{
923 unsigned long nr_switches;
924
925 SEQ_printf(m, "%s (%d, #threads: %d)\n", p->comm, task_pid_nr_ns(p, ns),
926 get_nr_threads(p));
927 SEQ_printf(m,
928 "---------------------------------------------------------"
929 "----------\n");
930#define __P(F) \
931 SEQ_printf(m, "%-45s:%21Ld\n", #F, (long long)F)
932#define P(F) \
933 SEQ_printf(m, "%-45s:%21Ld\n", #F, (long long)p->F)
934#define P_SCHEDSTAT(F) \
935 SEQ_printf(m, "%-45s:%21Ld\n", #F, (long long)schedstat_val(p->F))
936#define __PN(F) \
937 SEQ_printf(m, "%-45s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)F))
938#define PN(F) \
939 SEQ_printf(m, "%-45s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)p->F))
940#define PN_SCHEDSTAT(F) \
941 SEQ_printf(m, "%-45s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)schedstat_val(p->F)))
942
943 PN(se.exec_start);
944 PN(se.vruntime);
945 PN(se.sum_exec_runtime);
946
947 nr_switches = p->nvcsw + p->nivcsw;
948
949 P(se.nr_migrations);
950
951 if (schedstat_enabled()) {
952 u64 avg_atom, avg_per_cpu;
953
954 PN_SCHEDSTAT(se.statistics.sum_sleep_runtime);
955 PN_SCHEDSTAT(se.statistics.wait_start);
956 PN_SCHEDSTAT(se.statistics.sleep_start);
957 PN_SCHEDSTAT(se.statistics.block_start);
958 PN_SCHEDSTAT(se.statistics.sleep_max);
959 PN_SCHEDSTAT(se.statistics.block_max);
960 PN_SCHEDSTAT(se.statistics.exec_max);
961 PN_SCHEDSTAT(se.statistics.slice_max);
962 PN_SCHEDSTAT(se.statistics.wait_max);
963 PN_SCHEDSTAT(se.statistics.wait_sum);
964 P_SCHEDSTAT(se.statistics.wait_count);
965 PN_SCHEDSTAT(se.statistics.iowait_sum);
966 P_SCHEDSTAT(se.statistics.iowait_count);
967 P_SCHEDSTAT(se.statistics.nr_migrations_cold);
968 P_SCHEDSTAT(se.statistics.nr_failed_migrations_affine);
969 P_SCHEDSTAT(se.statistics.nr_failed_migrations_running);
970 P_SCHEDSTAT(se.statistics.nr_failed_migrations_hot);
971 P_SCHEDSTAT(se.statistics.nr_forced_migrations);
972 P_SCHEDSTAT(se.statistics.nr_wakeups);
973 P_SCHEDSTAT(se.statistics.nr_wakeups_sync);
974 P_SCHEDSTAT(se.statistics.nr_wakeups_migrate);
975 P_SCHEDSTAT(se.statistics.nr_wakeups_local);
976 P_SCHEDSTAT(se.statistics.nr_wakeups_remote);
977 P_SCHEDSTAT(se.statistics.nr_wakeups_affine);
978 P_SCHEDSTAT(se.statistics.nr_wakeups_affine_attempts);
979 P_SCHEDSTAT(se.statistics.nr_wakeups_passive);
980 P_SCHEDSTAT(se.statistics.nr_wakeups_idle);
981
982 avg_atom = p->se.sum_exec_runtime;
983 if (nr_switches)
984 avg_atom = div64_ul(avg_atom, nr_switches);
985 else
986 avg_atom = -1LL;
987
988 avg_per_cpu = p->se.sum_exec_runtime;
989 if (p->se.nr_migrations) {
990 avg_per_cpu = div64_u64(avg_per_cpu,
991 p->se.nr_migrations);
992 } else {
993 avg_per_cpu = -1LL;
994 }
995
996 __PN(avg_atom);
997 __PN(avg_per_cpu);
998 }
999
1000 __P(nr_switches);
1001 SEQ_printf(m, "%-45s:%21Ld\n",
1002 "nr_voluntary_switches", (long long)p->nvcsw);
1003 SEQ_printf(m, "%-45s:%21Ld\n",
1004 "nr_involuntary_switches", (long long)p->nivcsw);
1005
1006 P(se.load.weight);
1007#ifdef CONFIG_SMP
1008 P(se.avg.load_sum);
1009 P(se.avg.util_sum);
1010 P(se.avg.load_avg);
1011 P(se.avg.util_avg);
1012 P(se.avg.last_update_time);
1013#endif
1014 P(policy);
1015 P(prio);
1016 if (p->policy == SCHED_DEADLINE) {
1017 P(dl.runtime);
1018 P(dl.deadline);
1019 }
1020#undef PN_SCHEDSTAT
1021#undef PN
1022#undef __PN
1023#undef P_SCHEDSTAT
1024#undef P
1025#undef __P
1026
1027 {
1028 unsigned int this_cpu = raw_smp_processor_id();
1029 u64 t0, t1;
1030
1031 t0 = cpu_clock(this_cpu);
1032 t1 = cpu_clock(this_cpu);
1033 SEQ_printf(m, "%-45s:%21Ld\n",
1034 "clock-delta", (long long)(t1-t0));
1035 }
1036
1037 sched_show_numa(p, m);
1038}
1039
1040void proc_sched_set_task(struct task_struct *p)
1041{
1042#ifdef CONFIG_SCHEDSTATS
1043 memset(&p->se.statistics, 0, sizeof(p->se.statistics));
1044#endif
1045}