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btrfs: Fix out-of-space bug
[linux-2.6/btrfs-unstable.git] / kernel / sched / debug.c
blob92cc52001e74d1f9298c13cf75c6b5c3501c6379
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
22 static 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 */
39 static 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
51 static 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
62 static 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
107 static char group_path[PATH_MAX];
108
109 static 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
118 static void
119 print_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
150 static 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
171 void 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
242 void 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
264 void print_dl_rq(struct seq_file *m, int cpu, struct dl_rq *dl_rq)
265 {
266 SEQ_printf(m, "\ndl_rq[%d]:\n", cpu);
267 SEQ_printf(m, " .%-30s: %ld\n", "dl_nr_running", dl_rq->dl_nr_running);
268 }
269
270 extern __read_mostly int sched_clock_running;
271
272 static void print_cpu(struct seq_file *m, int cpu)
273 {
274 struct rq *rq = cpu_rq(cpu);
275 unsigned long flags;
276
277 #ifdef CONFIG_X86
278 {
279 unsigned int freq = cpu_khz ? : 1;
280
281 SEQ_printf(m, "cpu#%d, %u.%03u MHz\n",
282 cpu, freq / 1000, (freq % 1000));
283 }
284 #else
285 SEQ_printf(m, "cpu#%d\n", cpu);
286 #endif
287
288 #define P(x) \
289 do { \
290 if (sizeof(rq->x) == 4) \
291 SEQ_printf(m, " .%-30s: %ld\n", #x, (long)(rq->x)); \
292 else \
293 SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rq->x));\
294 } while (0)
295
296 #define PN(x) \
297 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rq->x))
298
299 P(nr_running);
300 SEQ_printf(m, " .%-30s: %lu\n", "load",
301 rq->load.weight);
302 P(nr_switches);
303 P(nr_load_updates);
304 P(nr_uninterruptible);
305 PN(next_balance);
306 SEQ_printf(m, " .%-30s: %ld\n", "curr->pid", (long)(task_pid_nr(rq->curr)));
307 PN(clock);
308 P(cpu_load[0]);
309 P(cpu_load[1]);
310 P(cpu_load[2]);
311 P(cpu_load[3]);
312 P(cpu_load[4]);
313 #undef P
314 #undef PN
315
316 #ifdef CONFIG_SCHEDSTATS
317 #define P(n) SEQ_printf(m, " .%-30s: %d\n", #n, rq->n);
318 #define P64(n) SEQ_printf(m, " .%-30s: %Ld\n", #n, rq->n);
319
320 P(yld_count);
321
322 P(sched_count);
323 P(sched_goidle);
324 #ifdef CONFIG_SMP
325 P64(avg_idle);
326 P64(max_idle_balance_cost);
327 #endif
328
329 P(ttwu_count);
330 P(ttwu_local);
331
332 #undef P
333 #undef P64
334 #endif
335 spin_lock_irqsave(&sched_debug_lock, flags);
336 print_cfs_stats(m, cpu);
337 print_rt_stats(m, cpu);
338 print_dl_stats(m, cpu);
339
340 print_rq(m, rq, cpu);
341 spin_unlock_irqrestore(&sched_debug_lock, flags);
342 SEQ_printf(m, "\n");
343 }
344
345 static const char *sched_tunable_scaling_names[] = {
346 "none",
347 "logaritmic",
348 "linear"
349 };
350
351 static void sched_debug_header(struct seq_file *m)
352 {
353 u64 ktime, sched_clk, cpu_clk;
354 unsigned long flags;
355
356 local_irq_save(flags);
357 ktime = ktime_to_ns(ktime_get());
358 sched_clk = sched_clock();
359 cpu_clk = local_clock();
360 local_irq_restore(flags);
361
362 SEQ_printf(m, "Sched Debug Version: v0.11, %s %.*s\n",
363 init_utsname()->release,
364 (int)strcspn(init_utsname()->version, " "),
365 init_utsname()->version);
366
367 #define P(x) \
368 SEQ_printf(m, "%-40s: %Ld\n", #x, (long long)(x))
369 #define PN(x) \
370 SEQ_printf(m, "%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x))
371 PN(ktime);
372 PN(sched_clk);
373 PN(cpu_clk);
374 P(jiffies);
375 #ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
376 P(sched_clock_stable());
377 #endif
378 #undef PN
379 #undef P
380
381 SEQ_printf(m, "\n");
382 SEQ_printf(m, "sysctl_sched\n");
383
384 #define P(x) \
385 SEQ_printf(m, " .%-40s: %Ld\n", #x, (long long)(x))
386 #define PN(x) \
387 SEQ_printf(m, " .%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x))
388 PN(sysctl_sched_latency);
389 PN(sysctl_sched_min_granularity);
390 PN(sysctl_sched_wakeup_granularity);
391 P(sysctl_sched_child_runs_first);
392 P(sysctl_sched_features);
393 #undef PN
394 #undef P
395
396 SEQ_printf(m, " .%-40s: %d (%s)\n",
397 "sysctl_sched_tunable_scaling",
398 sysctl_sched_tunable_scaling,
399 sched_tunable_scaling_names[sysctl_sched_tunable_scaling]);
400 SEQ_printf(m, "\n");
401 }
402
403 static int sched_debug_show(struct seq_file *m, void *v)
404 {
405 int cpu = (unsigned long)(v - 2);
406
407 if (cpu != -1)
408 print_cpu(m, cpu);
409 else
410 sched_debug_header(m);
411
412 return 0;
413 }
414
415 void sysrq_sched_debug_show(void)
416 {
417 int cpu;
418
419 sched_debug_header(NULL);
420 for_each_online_cpu(cpu)
421 print_cpu(NULL, cpu);
422
423 }
424
425 /*
426 * This itererator needs some explanation.
427 * It returns 1 for the header position.
428 * This means 2 is cpu 0.
429 * In a hotplugged system some cpus, including cpu 0, may be missing so we have
430 * to use cpumask_* to iterate over the cpus.
431 */
432 static void *sched_debug_start(struct seq_file *file, loff_t *offset)
433 {
434 unsigned long n = *offset;
435
436 if (n == 0)
437 return (void *) 1;
438
439 n--;
440
441 if (n > 0)
442 n = cpumask_next(n - 1, cpu_online_mask);
443 else
444 n = cpumask_first(cpu_online_mask);
445
446 *offset = n + 1;
447
448 if (n < nr_cpu_ids)
449 return (void *)(unsigned long)(n + 2);
450 return NULL;
451 }
452
453 static void *sched_debug_next(struct seq_file *file, void *data, loff_t *offset)
454 {
455 (*offset)++;
456 return sched_debug_start(file, offset);
457 }
458
459 static void sched_debug_stop(struct seq_file *file, void *data)
460 {
461 }
462
463 static const struct seq_operations sched_debug_sops = {
464 .start = sched_debug_start,
465 .next = sched_debug_next,
466 .stop = sched_debug_stop,
467 .show = sched_debug_show,
468 };
469
470 static int sched_debug_release(struct inode *inode, struct file *file)
471 {
472 seq_release(inode, file);
473
474 return 0;
475 }
476
477 static int sched_debug_open(struct inode *inode, struct file *filp)
478 {
479 int ret = 0;
480
481 ret = seq_open(filp, &sched_debug_sops);
482
483 return ret;
484 }
485
486 static const struct file_operations sched_debug_fops = {
487 .open = sched_debug_open,
488 .read = seq_read,
489 .llseek = seq_lseek,
490 .release = sched_debug_release,
491 };
492
493 static int __init init_sched_debug_procfs(void)
494 {
495 struct proc_dir_entry *pe;
496
497 pe = proc_create("sched_debug", 0444, NULL, &sched_debug_fops);
498 if (!pe)
499 return -ENOMEM;
500 return 0;
501 }
502
503 __initcall(init_sched_debug_procfs);
504
505 #define __P(F) \
506 SEQ_printf(m, "%-45s:%21Ld\n", #F, (long long)F)
507 #define P(F) \
508 SEQ_printf(m, "%-45s:%21Ld\n", #F, (long long)p->F)
509 #define __PN(F) \
510 SEQ_printf(m, "%-45s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)F))
511 #define PN(F) \
512 SEQ_printf(m, "%-45s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)p->F))
513
514
515 static void sched_show_numa(struct task_struct *p, struct seq_file *m)
516 {
517 #ifdef CONFIG_NUMA_BALANCING
518 struct mempolicy *pol;
519 int node, i;
520
521 if (p->mm)
522 P(mm->numa_scan_seq);
523
524 task_lock(p);
525 pol = p->mempolicy;
526 if (pol && !(pol->flags & MPOL_F_MORON))
527 pol = NULL;
528 mpol_get(pol);
529 task_unlock(p);
530
531 SEQ_printf(m, "numa_migrations, %ld\n", xchg(&p->numa_pages_migrated, 0));
532
533 for_each_online_node(node) {
534 for (i = 0; i < 2; i++) {
535 unsigned long nr_faults = -1;
536 int cpu_current, home_node;
537
538 if (p->numa_faults)
539 nr_faults = p->numa_faults[2*node + i];
540
541 cpu_current = !i ? (task_node(p) == node) :
542 (pol && node_isset(node, pol->v.nodes));
543
544 home_node = (p->numa_preferred_nid == node);
545
546 SEQ_printf(m, "numa_faults_memory, %d, %d, %d, %d, %ld\n",
547 i, node, cpu_current, home_node, nr_faults);
548 }
549 }
550
551 mpol_put(pol);
552 #endif
553 }
554
555 void proc_sched_show_task(struct task_struct *p, struct seq_file *m)
556 {
557 unsigned long nr_switches;
558
559 SEQ_printf(m, "%s (%d, #threads: %d)\n", p->comm, task_pid_nr(p),
560 get_nr_threads(p));
561 SEQ_printf(m,
562 "---------------------------------------------------------"
563 "----------\n");
564 #define __P(F) \
565 SEQ_printf(m, "%-45s:%21Ld\n", #F, (long long)F)
566 #define P(F) \
567 SEQ_printf(m, "%-45s:%21Ld\n", #F, (long long)p->F)
568 #define __PN(F) \
569 SEQ_printf(m, "%-45s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)F))
570 #define PN(F) \
571 SEQ_printf(m, "%-45s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)p->F))
572
573 PN(se.exec_start);
574 PN(se.vruntime);
575 PN(se.sum_exec_runtime);
576
577 nr_switches = p->nvcsw + p->nivcsw;
578
579 #ifdef CONFIG_SCHEDSTATS
580 PN(se.statistics.wait_start);
581 PN(se.statistics.sleep_start);
582 PN(se.statistics.block_start);
583 PN(se.statistics.sleep_max);
584 PN(se.statistics.block_max);
585 PN(se.statistics.exec_max);
586 PN(se.statistics.slice_max);
587 PN(se.statistics.wait_max);
588 PN(se.statistics.wait_sum);
589 P(se.statistics.wait_count);
590 PN(se.statistics.iowait_sum);
591 P(se.statistics.iowait_count);
592 P(se.nr_migrations);
593 P(se.statistics.nr_migrations_cold);
594 P(se.statistics.nr_failed_migrations_affine);
595 P(se.statistics.nr_failed_migrations_running);
596 P(se.statistics.nr_failed_migrations_hot);
597 P(se.statistics.nr_forced_migrations);
598 P(se.statistics.nr_wakeups);
599 P(se.statistics.nr_wakeups_sync);
600 P(se.statistics.nr_wakeups_migrate);
601 P(se.statistics.nr_wakeups_local);
602 P(se.statistics.nr_wakeups_remote);
603 P(se.statistics.nr_wakeups_affine);
604 P(se.statistics.nr_wakeups_affine_attempts);
605 P(se.statistics.nr_wakeups_passive);
606 P(se.statistics.nr_wakeups_idle);
607
608 {
609 u64 avg_atom, avg_per_cpu;
610
611 avg_atom = p->se.sum_exec_runtime;
612 if (nr_switches)
613 avg_atom = div64_ul(avg_atom, nr_switches);
614 else
615 avg_atom = -1LL;
616
617 avg_per_cpu = p->se.sum_exec_runtime;
618 if (p->se.nr_migrations) {
619 avg_per_cpu = div64_u64(avg_per_cpu,
620 p->se.nr_migrations);
621 } else {
622 avg_per_cpu = -1LL;
623 }
624
625 __PN(avg_atom);
626 __PN(avg_per_cpu);
627 }
628 #endif
629 __P(nr_switches);
630 SEQ_printf(m, "%-45s:%21Ld\n",
631 "nr_voluntary_switches", (long long)p->nvcsw);
632 SEQ_printf(m, "%-45s:%21Ld\n",
633 "nr_involuntary_switches", (long long)p->nivcsw);
634
635 P(se.load.weight);
636 #ifdef CONFIG_SMP
637 P(se.avg.runnable_avg_sum);
638 P(se.avg.runnable_avg_period);
639 P(se.avg.load_avg_contrib);
640 P(se.avg.decay_count);
641 #endif
642 P(policy);
643 P(prio);
644 #undef PN
645 #undef __PN
646 #undef P
647 #undef __P
648
649 {
650 unsigned int this_cpu = raw_smp_processor_id();
651 u64 t0, t1;
652
653 t0 = cpu_clock(this_cpu);
654 t1 = cpu_clock(this_cpu);
655 SEQ_printf(m, "%-45s:%21Ld\n",
656 "clock-delta", (long long)(t1-t0));
657 }
658
659 sched_show_numa(p, m);
660 }
661
662 void proc_sched_set_task(struct task_struct *p)
663 {
664 #ifdef CONFIG_SCHEDSTATS
665 memset(&p->se.statistics, 0, sizeof(p->se.statistics));
666 #endif
667 }
(deprecated) Btrfs devel tree