projects/linux·blob v3.18 · refs

660 lines · 15.2 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.h>
15#include <linux/seq_file.h>
16#include <linux/kallsyms.h>
17#include <linux/utsname.h>
18#include <linux/mempolicy.h>
19
20#include "sched.h"
21
22static DEFINE_SPINLOCK(sched_debug_lock);
23
24/*
25 * This allows printing both to /proc/sched_debug and
26 * to the console
27 */
28#define SEQ_printf(m, x...) \
29 do { \
30 if (m) \
31 seq_printf(m, x); \
32 else \
33 printk(x); \
34 } while (0)
35
36/*
37 * Ease the printing of nsec fields:
38 */
39static long long nsec_high(unsigned long long nsec)
40{
41 if ((long long)nsec < 0) {
42 nsec = -nsec;
43 do_div(nsec, 1000000);
44 return -nsec;
45 }
46 do_div(nsec, 1000000);
47
48 return nsec;
49}
50
51static unsigned long nsec_low(unsigned long long nsec)
52{
53 if ((long long)nsec < 0)
54 nsec = -nsec;
55
56 return do_div(nsec, 1000000);
57}
58
59#define SPLIT_NS(x) nsec_high(x), nsec_low(x)
60
61#ifdef CONFIG_FAIR_GROUP_SCHED
62static void print_cfs_group_stats(struct seq_file *m, int cpu, struct task_group *tg)
63{
64 struct sched_entity *se = tg->se[cpu];
65
66#define P(F) \
67 SEQ_printf(m, " .%-30s: %lld\n", #F, (long long)F)
68#define PN(F) \
69 SEQ_printf(m, " .%-30s: %lld.%06ld\n", #F, SPLIT_NS((long long)F))
70
71 if (!se) {
72 struct sched_avg *avg = &cpu_rq(cpu)->avg;
73 P(avg->runnable_avg_sum);
74 P(avg->runnable_avg_period);
75 return;
76 }
77
78
79 PN(se->exec_start);
80 PN(se->vruntime);
81 PN(se->sum_exec_runtime);
82#ifdef CONFIG_SCHEDSTATS
83 PN(se->statistics.wait_start);
84 PN(se->statistics.sleep_start);
85 PN(se->statistics.block_start);
86 PN(se->statistics.sleep_max);
87 PN(se->statistics.block_max);
88 PN(se->statistics.exec_max);
89 PN(se->statistics.slice_max);
90 PN(se->statistics.wait_max);
91 PN(se->statistics.wait_sum);
92 P(se->statistics.wait_count);
93#endif
94 P(se->load.weight);
95#ifdef CONFIG_SMP
96 P(se->avg.runnable_avg_sum);
97 P(se->avg.runnable_avg_period);
98 P(se->avg.load_avg_contrib);
99 P(se->avg.decay_count);
100#endif
101#undef PN
102#undef P
103}
104#endif
105
106#ifdef CONFIG_CGROUP_SCHED
107static char group_path[PATH_MAX];
108
109static char *task_group_path(struct task_group *tg)
110{
111 if (autogroup_path(tg, group_path, PATH_MAX))
112 return group_path;
113
114 return cgroup_path(tg->css.cgroup, group_path, PATH_MAX);
115}
116#endif
117
118static void
119print_task(struct seq_file *m, struct rq *rq, struct task_struct *p)
120{
121 if (rq->curr == p)
122 SEQ_printf(m, "R");
123 else
124 SEQ_printf(m, " ");
125
126 SEQ_printf(m, "%15s %5d %9Ld.%06ld %9Ld %5d ",
127 p->comm, task_pid_nr(p),
128 SPLIT_NS(p->se.vruntime),
129 (long long)(p->nvcsw + p->nivcsw),
130 p->prio);
131#ifdef CONFIG_SCHEDSTATS
132 SEQ_printf(m, "%9Ld.%06ld %9Ld.%06ld %9Ld.%06ld",
133 SPLIT_NS(p->se.vruntime),
134 SPLIT_NS(p->se.sum_exec_runtime),
135 SPLIT_NS(p->se.statistics.sum_sleep_runtime));
136#else
137 SEQ_printf(m, "%15Ld %15Ld %15Ld.%06ld %15Ld.%06ld %15Ld.%06ld",
138 0LL, 0LL, 0LL, 0L, 0LL, 0L, 0LL, 0L);
139#endif
140#ifdef CONFIG_NUMA_BALANCING
141 SEQ_printf(m, " %d", task_node(p));
142#endif
143#ifdef CONFIG_CGROUP_SCHED
144 SEQ_printf(m, " %s", task_group_path(task_group(p)));
145#endif
146
147 SEQ_printf(m, "\n");
148}
149
150static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu)
151{
152 struct task_struct *g, *p;
153
154 SEQ_printf(m,
155 "\nrunnable tasks:\n"
156 " task PID tree-key switches prio"
157 " exec-runtime sum-exec sum-sleep\n"
158 "------------------------------------------------------"
159 "----------------------------------------------------\n");
160
161 rcu_read_lock();
162 for_each_process_thread(g, p) {
163 if (task_cpu(p) != rq_cpu)
164 continue;
165
166 print_task(m, rq, p);
167 }
168 rcu_read_unlock();
169}
170
171void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
172{
173 s64 MIN_vruntime = -1, min_vruntime, max_vruntime = -1,
174 spread, rq0_min_vruntime, spread0;
175 struct rq *rq = cpu_rq(cpu);
176 struct sched_entity *last;
177 unsigned long flags;
178
179#ifdef CONFIG_FAIR_GROUP_SCHED
180 SEQ_printf(m, "\ncfs_rq[%d]:%s\n", cpu, task_group_path(cfs_rq->tg));
181#else
182 SEQ_printf(m, "\ncfs_rq[%d]:\n", cpu);
183#endif
184 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "exec_clock",
185 SPLIT_NS(cfs_rq->exec_clock));
186
187 raw_spin_lock_irqsave(&rq->lock, flags);
188 if (cfs_rq->rb_leftmost)
189 MIN_vruntime = (__pick_first_entity(cfs_rq))->vruntime;
190 last = __pick_last_entity(cfs_rq);
191 if (last)
192 max_vruntime = last->vruntime;
193 min_vruntime = cfs_rq->min_vruntime;
194 rq0_min_vruntime = cpu_rq(0)->cfs.min_vruntime;
195 raw_spin_unlock_irqrestore(&rq->lock, flags);
196 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "MIN_vruntime",
197 SPLIT_NS(MIN_vruntime));
198 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "min_vruntime",
199 SPLIT_NS(min_vruntime));
200 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "max_vruntime",
201 SPLIT_NS(max_vruntime));
202 spread = max_vruntime - MIN_vruntime;
203 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "spread",
204 SPLIT_NS(spread));
205 spread0 = min_vruntime - rq0_min_vruntime;
206 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "spread0",
207 SPLIT_NS(spread0));
208 SEQ_printf(m, " .%-30s: %d\n", "nr_spread_over",
209 cfs_rq->nr_spread_over);
210 SEQ_printf(m, " .%-30s: %d\n", "nr_running", cfs_rq->nr_running);
211 SEQ_printf(m, " .%-30s: %ld\n", "load", cfs_rq->load.weight);
212#ifdef CONFIG_SMP
213 SEQ_printf(m, " .%-30s: %ld\n", "runnable_load_avg",
214 cfs_rq->runnable_load_avg);
215 SEQ_printf(m, " .%-30s: %ld\n", "blocked_load_avg",
216 cfs_rq->blocked_load_avg);
217#ifdef CONFIG_FAIR_GROUP_SCHED
218 SEQ_printf(m, " .%-30s: %ld\n", "tg_load_contrib",
219 cfs_rq->tg_load_contrib);
220 SEQ_printf(m, " .%-30s: %d\n", "tg_runnable_contrib",
221 cfs_rq->tg_runnable_contrib);
222 SEQ_printf(m, " .%-30s: %ld\n", "tg_load_avg",
223 atomic_long_read(&cfs_rq->tg->load_avg));
224 SEQ_printf(m, " .%-30s: %d\n", "tg->runnable_avg",
225 atomic_read(&cfs_rq->tg->runnable_avg));
226#endif
227#endif
228#ifdef CONFIG_CFS_BANDWIDTH
229 SEQ_printf(m, " .%-30s: %d\n", "tg->cfs_bandwidth.timer_active",
230 cfs_rq->tg->cfs_bandwidth.timer_active);
231 SEQ_printf(m, " .%-30s: %d\n", "throttled",
232 cfs_rq->throttled);
233 SEQ_printf(m, " .%-30s: %d\n", "throttle_count",
234 cfs_rq->throttle_count);
235#endif
236
237#ifdef CONFIG_FAIR_GROUP_SCHED
238 print_cfs_group_stats(m, cpu, cfs_rq->tg);
239#endif
240}
241
242void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq)
243{
244#ifdef CONFIG_RT_GROUP_SCHED
245 SEQ_printf(m, "\nrt_rq[%d]:%s\n", cpu, task_group_path(rt_rq->tg));
246#else
247 SEQ_printf(m, "\nrt_rq[%d]:\n", cpu);
248#endif
249
250#define P(x) \
251 SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rt_rq->x))
252#define PN(x) \
253 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rt_rq->x))
254
255 P(rt_nr_running);
256 P(rt_throttled);
257 PN(rt_time);
258 PN(rt_runtime);
259
260#undef PN
261#undef P
262}
263
264extern __read_mostly int sched_clock_running;
265
266static void print_cpu(struct seq_file *m, int cpu)
267{
268 struct rq *rq = cpu_rq(cpu);
269 unsigned long flags;
270
271#ifdef CONFIG_X86
272 {
273 unsigned int freq = cpu_khz ? : 1;
274
275 SEQ_printf(m, "cpu#%d, %u.%03u MHz\n",
276 cpu, freq / 1000, (freq % 1000));
277 }
278#else
279 SEQ_printf(m, "cpu#%d\n", cpu);
280#endif
281
282#define P(x) \
283do { \
284 if (sizeof(rq->x) == 4) \
285 SEQ_printf(m, " .%-30s: %ld\n", #x, (long)(rq->x)); \
286 else \
287 SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rq->x));\
288} while (0)
289
290#define PN(x) \
291 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rq->x))
292
293 P(nr_running);
294 SEQ_printf(m, " .%-30s: %lu\n", "load",
295 rq->load.weight);
296 P(nr_switches);
297 P(nr_load_updates);
298 P(nr_uninterruptible);
299 PN(next_balance);
300 SEQ_printf(m, " .%-30s: %ld\n", "curr->pid", (long)(task_pid_nr(rq->curr)));
301 PN(clock);
302 P(cpu_load[0]);
303 P(cpu_load[1]);
304 P(cpu_load[2]);
305 P(cpu_load[3]);
306 P(cpu_load[4]);
307#undef P
308#undef PN
309
310#ifdef CONFIG_SCHEDSTATS
311#define P(n) SEQ_printf(m, " .%-30s: %d\n", #n, rq->n);
312#define P64(n) SEQ_printf(m, " .%-30s: %Ld\n", #n, rq->n);
313
314 P(yld_count);
315
316 P(sched_count);
317 P(sched_goidle);
318#ifdef CONFIG_SMP
319 P64(avg_idle);
320 P64(max_idle_balance_cost);
321#endif
322
323 P(ttwu_count);
324 P(ttwu_local);
325
326#undef P
327#undef P64
328#endif
329 spin_lock_irqsave(&sched_debug_lock, flags);
330 print_cfs_stats(m, cpu);
331 print_rt_stats(m, cpu);
332
333 print_rq(m, rq, cpu);
334 spin_unlock_irqrestore(&sched_debug_lock, flags);
335 SEQ_printf(m, "\n");
336}
337
338static const char *sched_tunable_scaling_names[] = {
339 "none",
340 "logaritmic",
341 "linear"
342};
343
344static void sched_debug_header(struct seq_file *m)
345{
346 u64 ktime, sched_clk, cpu_clk;
347 unsigned long flags;
348
349 local_irq_save(flags);
350 ktime = ktime_to_ns(ktime_get());
351 sched_clk = sched_clock();
352 cpu_clk = local_clock();
353 local_irq_restore(flags);
354
355 SEQ_printf(m, "Sched Debug Version: v0.11, %s %.*s\n",
356 init_utsname()->release,
357 (int)strcspn(init_utsname()->version, " "),
358 init_utsname()->version);
359
360#define P(x) \
361 SEQ_printf(m, "%-40s: %Ld\n", #x, (long long)(x))
362#define PN(x) \
363 SEQ_printf(m, "%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x))
364 PN(ktime);
365 PN(sched_clk);
366 PN(cpu_clk);
367 P(jiffies);
368#ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
369 P(sched_clock_stable());
370#endif
371#undef PN
372#undef P
373
374 SEQ_printf(m, "\n");
375 SEQ_printf(m, "sysctl_sched\n");
376
377#define P(x) \
378 SEQ_printf(m, " .%-40s: %Ld\n", #x, (long long)(x))
379#define PN(x) \
380 SEQ_printf(m, " .%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x))
381 PN(sysctl_sched_latency);
382 PN(sysctl_sched_min_granularity);
383 PN(sysctl_sched_wakeup_granularity);
384 P(sysctl_sched_child_runs_first);
385 P(sysctl_sched_features);
386#undef PN
387#undef P
388
389 SEQ_printf(m, " .%-40s: %d (%s)\n",
390 "sysctl_sched_tunable_scaling",
391 sysctl_sched_tunable_scaling,
392 sched_tunable_scaling_names[sysctl_sched_tunable_scaling]);
393 SEQ_printf(m, "\n");
394}
395
396static int sched_debug_show(struct seq_file *m, void *v)
397{
398 int cpu = (unsigned long)(v - 2);
399
400 if (cpu != -1)
401 print_cpu(m, cpu);
402 else
403 sched_debug_header(m);
404
405 return 0;
406}
407
408void sysrq_sched_debug_show(void)
409{
410 int cpu;
411
412 sched_debug_header(NULL);
413 for_each_online_cpu(cpu)
414 print_cpu(NULL, cpu);
415
416}
417
418/*
419 * This itererator needs some explanation.
420 * It returns 1 for the header position.
421 * This means 2 is cpu 0.
422 * In a hotplugged system some cpus, including cpu 0, may be missing so we have
423 * to use cpumask_* to iterate over the cpus.
424 */
425static void *sched_debug_start(struct seq_file *file, loff_t *offset)
426{
427 unsigned long n = *offset;
428
429 if (n == 0)
430 return (void *) 1;
431
432 n--;
433
434 if (n > 0)
435 n = cpumask_next(n - 1, cpu_online_mask);
436 else
437 n = cpumask_first(cpu_online_mask);
438
439 *offset = n + 1;
440
441 if (n < nr_cpu_ids)
442 return (void *)(unsigned long)(n + 2);
443 return NULL;
444}
445
446static void *sched_debug_next(struct seq_file *file, void *data, loff_t *offset)
447{
448 (*offset)++;
449 return sched_debug_start(file, offset);
450}
451
452static void sched_debug_stop(struct seq_file *file, void *data)
453{
454}
455
456static const struct seq_operations sched_debug_sops = {
457 .start = sched_debug_start,
458 .next = sched_debug_next,
459 .stop = sched_debug_stop,
460 .show = sched_debug_show,
461};
462
463static int sched_debug_release(struct inode *inode, struct file *file)
464{
465 seq_release(inode, file);
466
467 return 0;
468}
469
470static int sched_debug_open(struct inode *inode, struct file *filp)
471{
472 int ret = 0;
473
474 ret = seq_open(filp, &sched_debug_sops);
475
476 return ret;
477}
478
479static const struct file_operations sched_debug_fops = {
480 .open = sched_debug_open,
481 .read = seq_read,
482 .llseek = seq_lseek,
483 .release = sched_debug_release,
484};
485
486static int __init init_sched_debug_procfs(void)
487{
488 struct proc_dir_entry *pe;
489
490 pe = proc_create("sched_debug", 0444, NULL, &sched_debug_fops);
491 if (!pe)
492 return -ENOMEM;
493 return 0;
494}
495
496__initcall(init_sched_debug_procfs);
497
498#define __P(F) \
499 SEQ_printf(m, "%-45s:%21Ld\n", #F, (long long)F)
500#define P(F) \
501 SEQ_printf(m, "%-45s:%21Ld\n", #F, (long long)p->F)
502#define __PN(F) \
503 SEQ_printf(m, "%-45s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)F))
504#define PN(F) \
505 SEQ_printf(m, "%-45s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)p->F))
506
507
508static void sched_show_numa(struct task_struct *p, struct seq_file *m)
509{
510#ifdef CONFIG_NUMA_BALANCING
511 struct mempolicy *pol;
512 int node, i;
513
514 if (p->mm)
515 P(mm->numa_scan_seq);
516
517 task_lock(p);
518 pol = p->mempolicy;
519 if (pol && !(pol->flags & MPOL_F_MORON))
520 pol = NULL;
521 mpol_get(pol);
522 task_unlock(p);
523
524 SEQ_printf(m, "numa_migrations, %ld\n", xchg(&p->numa_pages_migrated, 0));
525
526 for_each_online_node(node) {
527 for (i = 0; i < 2; i++) {
528 unsigned long nr_faults = -1;
529 int cpu_current, home_node;
530
531 if (p->numa_faults_memory)
532 nr_faults = p->numa_faults_memory[2*node + i];
533
534 cpu_current = !i ? (task_node(p) == node) :
535 (pol && node_isset(node, pol->v.nodes));
536
537 home_node = (p->numa_preferred_nid == node);
538
539 SEQ_printf(m, "numa_faults_memory, %d, %d, %d, %d, %ld\n",
540 i, node, cpu_current, home_node, nr_faults);
541 }
542 }
543
544 mpol_put(pol);
545#endif
546}
547
548void proc_sched_show_task(struct task_struct *p, struct seq_file *m)
549{
550 unsigned long nr_switches;
551
552 SEQ_printf(m, "%s (%d, #threads: %d)\n", p->comm, task_pid_nr(p),
553 get_nr_threads(p));
554 SEQ_printf(m,
555 "---------------------------------------------------------"
556 "----------\n");
557#define __P(F) \
558 SEQ_printf(m, "%-45s:%21Ld\n", #F, (long long)F)
559#define P(F) \
560 SEQ_printf(m, "%-45s:%21Ld\n", #F, (long long)p->F)
561#define __PN(F) \
562 SEQ_printf(m, "%-45s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)F))
563#define PN(F) \
564 SEQ_printf(m, "%-45s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)p->F))
565
566 PN(se.exec_start);
567 PN(se.vruntime);
568 PN(se.sum_exec_runtime);
569
570 nr_switches = p->nvcsw + p->nivcsw;
571
572#ifdef CONFIG_SCHEDSTATS
573 PN(se.statistics.wait_start);
574 PN(se.statistics.sleep_start);
575 PN(se.statistics.block_start);
576 PN(se.statistics.sleep_max);
577 PN(se.statistics.block_max);
578 PN(se.statistics.exec_max);
579 PN(se.statistics.slice_max);
580 PN(se.statistics.wait_max);
581 PN(se.statistics.wait_sum);
582 P(se.statistics.wait_count);
583 PN(se.statistics.iowait_sum);
584 P(se.statistics.iowait_count);
585 P(se.nr_migrations);
586 P(se.statistics.nr_migrations_cold);
587 P(se.statistics.nr_failed_migrations_affine);
588 P(se.statistics.nr_failed_migrations_running);
589 P(se.statistics.nr_failed_migrations_hot);
590 P(se.statistics.nr_forced_migrations);
591 P(se.statistics.nr_wakeups);
592 P(se.statistics.nr_wakeups_sync);
593 P(se.statistics.nr_wakeups_migrate);
594 P(se.statistics.nr_wakeups_local);
595 P(se.statistics.nr_wakeups_remote);
596 P(se.statistics.nr_wakeups_affine);
597 P(se.statistics.nr_wakeups_affine_attempts);
598 P(se.statistics.nr_wakeups_passive);
599 P(se.statistics.nr_wakeups_idle);
600
601 {
602 u64 avg_atom, avg_per_cpu;
603
604 avg_atom = p->se.sum_exec_runtime;
605 if (nr_switches)
606 avg_atom = div64_ul(avg_atom, nr_switches);
607 else
608 avg_atom = -1LL;
609
610 avg_per_cpu = p->se.sum_exec_runtime;
611 if (p->se.nr_migrations) {
612 avg_per_cpu = div64_u64(avg_per_cpu,
613 p->se.nr_migrations);
614 } else {
615 avg_per_cpu = -1LL;
616 }
617
618 __PN(avg_atom);
619 __PN(avg_per_cpu);
620 }
621#endif
622 __P(nr_switches);
623 SEQ_printf(m, "%-45s:%21Ld\n",
624 "nr_voluntary_switches", (long long)p->nvcsw);
625 SEQ_printf(m, "%-45s:%21Ld\n",
626 "nr_involuntary_switches", (long long)p->nivcsw);
627
628 P(se.load.weight);
629#ifdef CONFIG_SMP
630 P(se.avg.runnable_avg_sum);
631 P(se.avg.runnable_avg_period);
632 P(se.avg.load_avg_contrib);
633 P(se.avg.decay_count);
634#endif
635 P(policy);
636 P(prio);
637#undef PN
638#undef __PN
639#undef P
640#undef __P
641
642 {
643 unsigned int this_cpu = raw_smp_processor_id();
644 u64 t0, t1;
645
646 t0 = cpu_clock(this_cpu);
647 t1 = cpu_clock(this_cpu);
648 SEQ_printf(m, "%-45s:%21Ld\n",
649 "clock-delta", (long long)(t1-t0));
650 }
651
652 sched_show_numa(p, m);
653}
654
655void proc_sched_set_task(struct task_struct *p)
656{
657#ifdef CONFIG_SCHEDSTATS
658 memset(&p->se.statistics, 0, sizeof(p->se.statistics));
659#endif
660}