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1/*
2 * kernel/time/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
19static DEFINE_SPINLOCK(sched_debug_lock);
20
21/*
22 * This allows printing both to /proc/sched_debug and
23 * to the console
24 */
25#define SEQ_printf(m, x...) \
26 do { \
27 if (m) \
28 seq_printf(m, x); \
29 else \
30 printk(x); \
31 } while (0)
32
33/*
34 * Ease the printing of nsec fields:
35 */
36static long long nsec_high(unsigned long long nsec)
37{
38 if ((long long)nsec < 0) {
39 nsec = -nsec;
40 do_div(nsec, 1000000);
41 return -nsec;
42 }
43 do_div(nsec, 1000000);
44
45 return nsec;
46}
47
48static unsigned long nsec_low(unsigned long long nsec)
49{
50 if ((long long)nsec < 0)
51 nsec = -nsec;
52
53 return do_div(nsec, 1000000);
54}
55
56#define SPLIT_NS(x) nsec_high(x), nsec_low(x)
57
58#ifdef CONFIG_FAIR_GROUP_SCHED
59static void print_cfs_group_stats(struct seq_file *m, int cpu, struct task_group *tg)
60{
61 struct sched_entity *se = tg->se[cpu];
62 if (!se)
63 return;
64
65#define P(F) \
66 SEQ_printf(m, " .%-30s: %lld\n", #F, (long long)F)
67#define PN(F) \
68 SEQ_printf(m, " .%-30s: %lld.%06ld\n", #F, SPLIT_NS((long long)F))
69
70 PN(se->exec_start);
71 PN(se->vruntime);
72 PN(se->sum_exec_runtime);
73#ifdef CONFIG_SCHEDSTATS
74 PN(se->statistics.wait_start);
75 PN(se->statistics.sleep_start);
76 PN(se->statistics.block_start);
77 PN(se->statistics.sleep_max);
78 PN(se->statistics.block_max);
79 PN(se->statistics.exec_max);
80 PN(se->statistics.slice_max);
81 PN(se->statistics.wait_max);
82 PN(se->statistics.wait_sum);
83 P(se->statistics.wait_count);
84#endif
85 P(se->load.weight);
86#undef PN
87#undef P
88}
89#endif
90
91#ifdef CONFIG_CGROUP_SCHED
92static char group_path[PATH_MAX];
93
94static char *task_group_path(struct task_group *tg)
95{
96 if (autogroup_path(tg, group_path, PATH_MAX))
97 return group_path;
98
99 /*
100 * May be NULL if the underlying cgroup isn't fully-created yet
101 */
102 if (!tg->css.cgroup) {
103 group_path[0] = '\0';
104 return group_path;
105 }
106 cgroup_path(tg->css.cgroup, group_path, PATH_MAX);
107 return group_path;
108}
109#endif
110
111static void
112print_task(struct seq_file *m, struct rq *rq, struct task_struct *p)
113{
114 if (rq->curr == p)
115 SEQ_printf(m, "R");
116 else
117 SEQ_printf(m, " ");
118
119 SEQ_printf(m, "%15s %5d %9Ld.%06ld %9Ld %5d ",
120 p->comm, p->pid,
121 SPLIT_NS(p->se.vruntime),
122 (long long)(p->nvcsw + p->nivcsw),
123 p->prio);
124#ifdef CONFIG_SCHEDSTATS
125 SEQ_printf(m, "%9Ld.%06ld %9Ld.%06ld %9Ld.%06ld",
126 SPLIT_NS(p->se.vruntime),
127 SPLIT_NS(p->se.sum_exec_runtime),
128 SPLIT_NS(p->se.statistics.sum_sleep_runtime));
129#else
130 SEQ_printf(m, "%15Ld %15Ld %15Ld.%06ld %15Ld.%06ld %15Ld.%06ld",
131 0LL, 0LL, 0LL, 0L, 0LL, 0L, 0LL, 0L);
132#endif
133#ifdef CONFIG_CGROUP_SCHED
134 SEQ_printf(m, " %s", task_group_path(task_group(p)));
135#endif
136
137 SEQ_printf(m, "\n");
138}
139
140static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu)
141{
142 struct task_struct *g, *p;
143 unsigned long flags;
144
145 SEQ_printf(m,
146 "\nrunnable tasks:\n"
147 " task PID tree-key switches prio"
148 " exec-runtime sum-exec sum-sleep\n"
149 "------------------------------------------------------"
150 "----------------------------------------------------\n");
151
152 read_lock_irqsave(&tasklist_lock, flags);
153
154 do_each_thread(g, p) {
155 if (!p->on_rq || task_cpu(p) != rq_cpu)
156 continue;
157
158 print_task(m, rq, p);
159 } while_each_thread(g, p);
160
161 read_unlock_irqrestore(&tasklist_lock, flags);
162}
163
164void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
165{
166 s64 MIN_vruntime = -1, min_vruntime, max_vruntime = -1,
167 spread, rq0_min_vruntime, spread0;
168 struct rq *rq = cpu_rq(cpu);
169 struct sched_entity *last;
170 unsigned long flags;
171
172#ifdef CONFIG_FAIR_GROUP_SCHED
173 SEQ_printf(m, "\ncfs_rq[%d]:%s\n", cpu, task_group_path(cfs_rq->tg));
174#else
175 SEQ_printf(m, "\ncfs_rq[%d]:\n", cpu);
176#endif
177 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "exec_clock",
178 SPLIT_NS(cfs_rq->exec_clock));
179
180 raw_spin_lock_irqsave(&rq->lock, flags);
181 if (cfs_rq->rb_leftmost)
182 MIN_vruntime = (__pick_first_entity(cfs_rq))->vruntime;
183 last = __pick_last_entity(cfs_rq);
184 if (last)
185 max_vruntime = last->vruntime;
186 min_vruntime = cfs_rq->min_vruntime;
187 rq0_min_vruntime = cpu_rq(0)->cfs.min_vruntime;
188 raw_spin_unlock_irqrestore(&rq->lock, flags);
189 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "MIN_vruntime",
190 SPLIT_NS(MIN_vruntime));
191 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "min_vruntime",
192 SPLIT_NS(min_vruntime));
193 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "max_vruntime",
194 SPLIT_NS(max_vruntime));
195 spread = max_vruntime - MIN_vruntime;
196 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "spread",
197 SPLIT_NS(spread));
198 spread0 = min_vruntime - rq0_min_vruntime;
199 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "spread0",
200 SPLIT_NS(spread0));
201 SEQ_printf(m, " .%-30s: %d\n", "nr_spread_over",
202 cfs_rq->nr_spread_over);
203 SEQ_printf(m, " .%-30s: %ld\n", "nr_running", cfs_rq->nr_running);
204 SEQ_printf(m, " .%-30s: %ld\n", "load", cfs_rq->load.weight);
205#ifdef CONFIG_FAIR_GROUP_SCHED
206#ifdef CONFIG_SMP
207 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "load_avg",
208 SPLIT_NS(cfs_rq->load_avg));
209 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "load_period",
210 SPLIT_NS(cfs_rq->load_period));
211 SEQ_printf(m, " .%-30s: %ld\n", "load_contrib",
212 cfs_rq->load_contribution);
213 SEQ_printf(m, " .%-30s: %d\n", "load_tg",
214 atomic_read(&cfs_rq->tg->load_weight));
215#endif
216
217 print_cfs_group_stats(m, cpu, cfs_rq->tg);
218#endif
219}
220
221void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq)
222{
223#ifdef CONFIG_RT_GROUP_SCHED
224 SEQ_printf(m, "\nrt_rq[%d]:%s\n", cpu, task_group_path(rt_rq->tg));
225#else
226 SEQ_printf(m, "\nrt_rq[%d]:\n", cpu);
227#endif
228
229#define P(x) \
230 SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rt_rq->x))
231#define PN(x) \
232 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rt_rq->x))
233
234 P(rt_nr_running);
235 P(rt_throttled);
236 PN(rt_time);
237 PN(rt_runtime);
238
239#undef PN
240#undef P
241}
242
243extern __read_mostly int sched_clock_running;
244
245static void print_cpu(struct seq_file *m, int cpu)
246{
247 struct rq *rq = cpu_rq(cpu);
248 unsigned long flags;
249
250#ifdef CONFIG_X86
251 {
252 unsigned int freq = cpu_khz ? : 1;
253
254 SEQ_printf(m, "\ncpu#%d, %u.%03u MHz\n",
255 cpu, freq / 1000, (freq % 1000));
256 }
257#else
258 SEQ_printf(m, "\ncpu#%d\n", cpu);
259#endif
260
261#define P(x) \
262 SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rq->x))
263#define PN(x) \
264 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rq->x))
265
266 P(nr_running);
267 SEQ_printf(m, " .%-30s: %lu\n", "load",
268 rq->load.weight);
269 P(nr_switches);
270 P(nr_load_updates);
271 P(nr_uninterruptible);
272 PN(next_balance);
273 P(curr->pid);
274 PN(clock);
275 P(cpu_load[0]);
276 P(cpu_load[1]);
277 P(cpu_load[2]);
278 P(cpu_load[3]);
279 P(cpu_load[4]);
280#undef P
281#undef PN
282
283#ifdef CONFIG_SCHEDSTATS
284#define P(n) SEQ_printf(m, " .%-30s: %d\n", #n, rq->n);
285#define P64(n) SEQ_printf(m, " .%-30s: %Ld\n", #n, rq->n);
286
287 P(yld_count);
288
289 P(sched_switch);
290 P(sched_count);
291 P(sched_goidle);
292#ifdef CONFIG_SMP
293 P64(avg_idle);
294#endif
295
296 P(ttwu_count);
297 P(ttwu_local);
298
299#undef P
300#undef P64
301#endif
302 spin_lock_irqsave(&sched_debug_lock, flags);
303 print_cfs_stats(m, cpu);
304 print_rt_stats(m, cpu);
305
306 rcu_read_lock();
307 print_rq(m, rq, cpu);
308 rcu_read_unlock();
309 spin_unlock_irqrestore(&sched_debug_lock, flags);
310}
311
312static const char *sched_tunable_scaling_names[] = {
313 "none",
314 "logaritmic",
315 "linear"
316};
317
318static int sched_debug_show(struct seq_file *m, void *v)
319{
320 u64 ktime, sched_clk, cpu_clk;
321 unsigned long flags;
322 int cpu;
323
324 local_irq_save(flags);
325 ktime = ktime_to_ns(ktime_get());
326 sched_clk = sched_clock();
327 cpu_clk = local_clock();
328 local_irq_restore(flags);
329
330 SEQ_printf(m, "Sched Debug Version: v0.10, %s %.*s\n",
331 init_utsname()->release,
332 (int)strcspn(init_utsname()->version, " "),
333 init_utsname()->version);
334
335#define P(x) \
336 SEQ_printf(m, "%-40s: %Ld\n", #x, (long long)(x))
337#define PN(x) \
338 SEQ_printf(m, "%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x))
339 PN(ktime);
340 PN(sched_clk);
341 PN(cpu_clk);
342 P(jiffies);
343#ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
344 P(sched_clock_stable);
345#endif
346#undef PN
347#undef P
348
349 SEQ_printf(m, "\n");
350 SEQ_printf(m, "sysctl_sched\n");
351
352#define P(x) \
353 SEQ_printf(m, " .%-40s: %Ld\n", #x, (long long)(x))
354#define PN(x) \
355 SEQ_printf(m, " .%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x))
356 PN(sysctl_sched_latency);
357 PN(sysctl_sched_min_granularity);
358 PN(sysctl_sched_wakeup_granularity);
359 P(sysctl_sched_child_runs_first);
360 P(sysctl_sched_features);
361#undef PN
362#undef P
363
364 SEQ_printf(m, " .%-40s: %d (%s)\n", "sysctl_sched_tunable_scaling",
365 sysctl_sched_tunable_scaling,
366 sched_tunable_scaling_names[sysctl_sched_tunable_scaling]);
367
368 for_each_online_cpu(cpu)
369 print_cpu(m, cpu);
370
371 SEQ_printf(m, "\n");
372
373 return 0;
374}
375
376static void sysrq_sched_debug_show(void)
377{
378 sched_debug_show(NULL, NULL);
379}
380
381static int sched_debug_open(struct inode *inode, struct file *filp)
382{
383 return single_open(filp, sched_debug_show, NULL);
384}
385
386static const struct file_operations sched_debug_fops = {
387 .open = sched_debug_open,
388 .read = seq_read,
389 .llseek = seq_lseek,
390 .release = single_release,
391};
392
393static int __init init_sched_debug_procfs(void)
394{
395 struct proc_dir_entry *pe;
396
397 pe = proc_create("sched_debug", 0444, NULL, &sched_debug_fops);
398 if (!pe)
399 return -ENOMEM;
400 return 0;
401}
402
403__initcall(init_sched_debug_procfs);
404
405void proc_sched_show_task(struct task_struct *p, struct seq_file *m)
406{
407 unsigned long nr_switches;
408
409 SEQ_printf(m, "%s (%d, #threads: %d)\n", p->comm, p->pid,
410 get_nr_threads(p));
411 SEQ_printf(m,
412 "---------------------------------------------------------\n");
413#define __P(F) \
414 SEQ_printf(m, "%-35s:%21Ld\n", #F, (long long)F)
415#define P(F) \
416 SEQ_printf(m, "%-35s:%21Ld\n", #F, (long long)p->F)
417#define __PN(F) \
418 SEQ_printf(m, "%-35s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)F))
419#define PN(F) \
420 SEQ_printf(m, "%-35s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)p->F))
421
422 PN(se.exec_start);
423 PN(se.vruntime);
424 PN(se.sum_exec_runtime);
425
426 nr_switches = p->nvcsw + p->nivcsw;
427
428#ifdef CONFIG_SCHEDSTATS
429 PN(se.statistics.wait_start);
430 PN(se.statistics.sleep_start);
431 PN(se.statistics.block_start);
432 PN(se.statistics.sleep_max);
433 PN(se.statistics.block_max);
434 PN(se.statistics.exec_max);
435 PN(se.statistics.slice_max);
436 PN(se.statistics.wait_max);
437 PN(se.statistics.wait_sum);
438 P(se.statistics.wait_count);
439 PN(se.statistics.iowait_sum);
440 P(se.statistics.iowait_count);
441 P(se.nr_migrations);
442 P(se.statistics.nr_migrations_cold);
443 P(se.statistics.nr_failed_migrations_affine);
444 P(se.statistics.nr_failed_migrations_running);
445 P(se.statistics.nr_failed_migrations_hot);
446 P(se.statistics.nr_forced_migrations);
447 P(se.statistics.nr_wakeups);
448 P(se.statistics.nr_wakeups_sync);
449 P(se.statistics.nr_wakeups_migrate);
450 P(se.statistics.nr_wakeups_local);
451 P(se.statistics.nr_wakeups_remote);
452 P(se.statistics.nr_wakeups_affine);
453 P(se.statistics.nr_wakeups_affine_attempts);
454 P(se.statistics.nr_wakeups_passive);
455 P(se.statistics.nr_wakeups_idle);
456
457 {
458 u64 avg_atom, avg_per_cpu;
459
460 avg_atom = p->se.sum_exec_runtime;
461 if (nr_switches)
462 do_div(avg_atom, nr_switches);
463 else
464 avg_atom = -1LL;
465
466 avg_per_cpu = p->se.sum_exec_runtime;
467 if (p->se.nr_migrations) {
468 avg_per_cpu = div64_u64(avg_per_cpu,
469 p->se.nr_migrations);
470 } else {
471 avg_per_cpu = -1LL;
472 }
473
474 __PN(avg_atom);
475 __PN(avg_per_cpu);
476 }
477#endif
478 __P(nr_switches);
479 SEQ_printf(m, "%-35s:%21Ld\n",
480 "nr_voluntary_switches", (long long)p->nvcsw);
481 SEQ_printf(m, "%-35s:%21Ld\n",
482 "nr_involuntary_switches", (long long)p->nivcsw);
483
484 P(se.load.weight);
485 P(policy);
486 P(prio);
487#undef PN
488#undef __PN
489#undef P
490#undef __P
491
492 {
493 unsigned int this_cpu = raw_smp_processor_id();
494 u64 t0, t1;
495
496 t0 = cpu_clock(this_cpu);
497 t1 = cpu_clock(this_cpu);
498 SEQ_printf(m, "%-35s:%21Ld\n",
499 "clock-delta", (long long)(t1-t0));
500 }
501}
502
503void proc_sched_set_task(struct task_struct *p)
504{
505#ifdef CONFIG_SCHEDSTATS
506 memset(&p->se.statistics, 0, sizeof(p->se.statistics));
507#endif
508}