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-rw-r--r--kernel/sched/debug.c510
1 files changed, 510 insertions, 0 deletions
diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
new file mode 100644
index 000000000000..2a075e10004b
--- /dev/null
+++ b/kernel/sched/debug.c
@@ -0,0 +1,510 @@
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
19#include "sched.h"
20
21static DEFINE_SPINLOCK(sched_debug_lock);
22
23/*
24 * This allows printing both to /proc/sched_debug and
25 * to the console
26 */
27#define SEQ_printf(m, x...) \
28 do { \
29 if (m) \
30 seq_printf(m, x); \
31 else \
32 printk(x); \
33 } while (0)
34
35/*
36 * Ease the printing of nsec fields:
37 */
38static long long nsec_high(unsigned long long nsec)
39{
40 if ((long long)nsec < 0) {
41 nsec = -nsec;
42 do_div(nsec, 1000000);
43 return -nsec;
44 }
45 do_div(nsec, 1000000);
46
47 return nsec;
48}
49
50static unsigned long nsec_low(unsigned long long nsec)
51{
52 if ((long long)nsec < 0)
53 nsec = -nsec;
54
55 return do_div(nsec, 1000000);
56}
57
58#define SPLIT_NS(x) nsec_high(x), nsec_low(x)
59
60#ifdef CONFIG_FAIR_GROUP_SCHED
61static void print_cfs_group_stats(struct seq_file *m, int cpu, struct task_group *tg)
62{
63 struct sched_entity *se = tg->se[cpu];
64 if (!se)
65 return;
66
67#define P(F) \
68 SEQ_printf(m, " .%-30s: %lld\n", #F, (long long)F)
69#define PN(F) \
70 SEQ_printf(m, " .%-30s: %lld.%06ld\n", #F, SPLIT_NS((long long)F))
71
72 PN(se->exec_start);
73 PN(se->vruntime);
74 PN(se->sum_exec_runtime);
75#ifdef CONFIG_SCHEDSTATS
76 PN(se->statistics.wait_start);
77 PN(se->statistics.sleep_start);
78 PN(se->statistics.block_start);
79 PN(se->statistics.sleep_max);
80 PN(se->statistics.block_max);
81 PN(se->statistics.exec_max);
82 PN(se->statistics.slice_max);
83 PN(se->statistics.wait_max);
84 PN(se->statistics.wait_sum);
85 P(se->statistics.wait_count);
86#endif
87 P(se->load.weight);
88#undef PN
89#undef P
90}
91#endif
92
93#ifdef CONFIG_CGROUP_SCHED
94static char group_path[PATH_MAX];
95
96static char *task_group_path(struct task_group *tg)
97{
98 if (autogroup_path(tg, group_path, PATH_MAX))
99 return group_path;
100
101 /*
102 * May be NULL if the underlying cgroup isn't fully-created yet
103 */
104 if (!tg->css.cgroup) {
105 group_path[0] = '\0';
106 return group_path;
107 }
108 cgroup_path(tg->css.cgroup, group_path, PATH_MAX);
109 return group_path;
110}
111#endif
112
113static void
114print_task(struct seq_file *m, struct rq *rq, struct task_struct *p)
115{
116 if (rq->curr == p)
117 SEQ_printf(m, "R");
118 else
119 SEQ_printf(m, " ");
120
121 SEQ_printf(m, "%15s %5d %9Ld.%06ld %9Ld %5d ",
122 p->comm, p->pid,
123 SPLIT_NS(p->se.vruntime),
124 (long long)(p->nvcsw + p->nivcsw),
125 p->prio);
126#ifdef CONFIG_SCHEDSTATS
127 SEQ_printf(m, "%9Ld.%06ld %9Ld.%06ld %9Ld.%06ld",
128 SPLIT_NS(p->se.vruntime),
129 SPLIT_NS(p->se.sum_exec_runtime),
130 SPLIT_NS(p->se.statistics.sum_sleep_runtime));
131#else
132 SEQ_printf(m, "%15Ld %15Ld %15Ld.%06ld %15Ld.%06ld %15Ld.%06ld",
133 0LL, 0LL, 0LL, 0L, 0LL, 0L, 0LL, 0L);
134#endif
135#ifdef CONFIG_CGROUP_SCHED
136 SEQ_printf(m, " %s", task_group_path(task_group(p)));
137#endif
138
139 SEQ_printf(m, "\n");
140}
141
142static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu)
143{
144 struct task_struct *g, *p;
145 unsigned long flags;
146
147 SEQ_printf(m,
148 "\nrunnable tasks:\n"
149 " task PID tree-key switches prio"
150 " exec-runtime sum-exec sum-sleep\n"
151 "------------------------------------------------------"
152 "----------------------------------------------------\n");
153
154 read_lock_irqsave(&tasklist_lock, flags);
155
156 do_each_thread(g, p) {
157 if (!p->on_rq || task_cpu(p) != rq_cpu)
158 continue;
159
160 print_task(m, rq, p);
161 } while_each_thread(g, p);
162
163 read_unlock_irqrestore(&tasklist_lock, flags);
164}
165
166void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
167{
168 s64 MIN_vruntime = -1, min_vruntime, max_vruntime = -1,
169 spread, rq0_min_vruntime, spread0;
170 struct rq *rq = cpu_rq(cpu);
171 struct sched_entity *last;
172 unsigned long flags;
173
174#ifdef CONFIG_FAIR_GROUP_SCHED
175 SEQ_printf(m, "\ncfs_rq[%d]:%s\n", cpu, task_group_path(cfs_rq->tg));
176#else
177 SEQ_printf(m, "\ncfs_rq[%d]:\n", cpu);
178#endif
179 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "exec_clock",
180 SPLIT_NS(cfs_rq->exec_clock));
181
182 raw_spin_lock_irqsave(&rq->lock, flags);
183 if (cfs_rq->rb_leftmost)
184 MIN_vruntime = (__pick_first_entity(cfs_rq))->vruntime;
185 last = __pick_last_entity(cfs_rq);
186 if (last)
187 max_vruntime = last->vruntime;
188 min_vruntime = cfs_rq->min_vruntime;
189 rq0_min_vruntime = cpu_rq(0)->cfs.min_vruntime;
190 raw_spin_unlock_irqrestore(&rq->lock, flags);
191 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "MIN_vruntime",
192 SPLIT_NS(MIN_vruntime));
193 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "min_vruntime",
194 SPLIT_NS(min_vruntime));
195 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "max_vruntime",
196 SPLIT_NS(max_vruntime));
197 spread = max_vruntime - MIN_vruntime;
198 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "spread",
199 SPLIT_NS(spread));
200 spread0 = min_vruntime - rq0_min_vruntime;
201 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "spread0",
202 SPLIT_NS(spread0));
203 SEQ_printf(m, " .%-30s: %d\n", "nr_spread_over",
204 cfs_rq->nr_spread_over);
205 SEQ_printf(m, " .%-30s: %ld\n", "nr_running", cfs_rq->nr_running);
206 SEQ_printf(m, " .%-30s: %ld\n", "load", cfs_rq->load.weight);
207#ifdef CONFIG_FAIR_GROUP_SCHED
208#ifdef CONFIG_SMP
209 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "load_avg",
210 SPLIT_NS(cfs_rq->load_avg));
211 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "load_period",
212 SPLIT_NS(cfs_rq->load_period));
213 SEQ_printf(m, " .%-30s: %ld\n", "load_contrib",
214 cfs_rq->load_contribution);
215 SEQ_printf(m, " .%-30s: %d\n", "load_tg",
216 atomic_read(&cfs_rq->tg->load_weight));
217#endif
218
219 print_cfs_group_stats(m, cpu, cfs_rq->tg);
220#endif
221}
222
223void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq)
224{
225#ifdef CONFIG_RT_GROUP_SCHED
226 SEQ_printf(m, "\nrt_rq[%d]:%s\n", cpu, task_group_path(rt_rq->tg));
227#else
228 SEQ_printf(m, "\nrt_rq[%d]:\n", cpu);
229#endif
230
231#define P(x) \
232 SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rt_rq->x))
233#define PN(x) \
234 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rt_rq->x))
235
236 P(rt_nr_running);
237 P(rt_throttled);
238 PN(rt_time);
239 PN(rt_runtime);
240
241#undef PN
242#undef P
243}
244
245extern __read_mostly int sched_clock_running;
246
247static void print_cpu(struct seq_file *m, int cpu)
248{
249 struct rq *rq = cpu_rq(cpu);
250 unsigned long flags;
251
252#ifdef CONFIG_X86
253 {
254 unsigned int freq = cpu_khz ? : 1;
255
256 SEQ_printf(m, "\ncpu#%d, %u.%03u MHz\n",
257 cpu, freq / 1000, (freq % 1000));
258 }
259#else
260 SEQ_printf(m, "\ncpu#%d\n", cpu);
261#endif
262
263#define P(x) \
264 SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rq->x))
265#define PN(x) \
266 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rq->x))
267
268 P(nr_running);
269 SEQ_printf(m, " .%-30s: %lu\n", "load",
270 rq->load.weight);
271 P(nr_switches);
272 P(nr_load_updates);
273 P(nr_uninterruptible);
274 PN(next_balance);
275 P(curr->pid);
276 PN(clock);
277 P(cpu_load[0]);
278 P(cpu_load[1]);
279 P(cpu_load[2]);
280 P(cpu_load[3]);
281 P(cpu_load[4]);
282#undef P
283#undef PN
284
285#ifdef CONFIG_SCHEDSTATS
286#define P(n) SEQ_printf(m, " .%-30s: %d\n", #n, rq->n);
287#define P64(n) SEQ_printf(m, " .%-30s: %Ld\n", #n, rq->n);
288
289 P(yld_count);
290
291 P(sched_switch);
292 P(sched_count);
293 P(sched_goidle);
294#ifdef CONFIG_SMP
295 P64(avg_idle);
296#endif
297
298 P(ttwu_count);
299 P(ttwu_local);
300
301#undef P
302#undef P64
303#endif
304 spin_lock_irqsave(&sched_debug_lock, flags);
305 print_cfs_stats(m, cpu);
306 print_rt_stats(m, cpu);
307
308 rcu_read_lock();
309 print_rq(m, rq, cpu);
310 rcu_read_unlock();
311 spin_unlock_irqrestore(&sched_debug_lock, flags);
312}
313
314static const char *sched_tunable_scaling_names[] = {
315 "none",
316 "logaritmic",
317 "linear"
318};
319
320static int sched_debug_show(struct seq_file *m, void *v)
321{
322 u64 ktime, sched_clk, cpu_clk;
323 unsigned long flags;
324 int cpu;
325
326 local_irq_save(flags);
327 ktime = ktime_to_ns(ktime_get());
328 sched_clk = sched_clock();
329 cpu_clk = local_clock();
330 local_irq_restore(flags);
331
332 SEQ_printf(m, "Sched Debug Version: v0.10, %s %.*s\n",
333 init_utsname()->release,
334 (int)strcspn(init_utsname()->version, " "),
335 init_utsname()->version);
336
337#define P(x) \
338 SEQ_printf(m, "%-40s: %Ld\n", #x, (long long)(x))
339#define PN(x) \
340 SEQ_printf(m, "%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x))
341 PN(ktime);
342 PN(sched_clk);
343 PN(cpu_clk);
344 P(jiffies);
345#ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
346 P(sched_clock_stable);
347#endif
348#undef PN
349#undef P
350
351 SEQ_printf(m, "\n");
352 SEQ_printf(m, "sysctl_sched\n");
353
354#define P(x) \
355 SEQ_printf(m, " .%-40s: %Ld\n", #x, (long long)(x))
356#define PN(x) \
357 SEQ_printf(m, " .%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x))
358 PN(sysctl_sched_latency);
359 PN(sysctl_sched_min_granularity);
360 PN(sysctl_sched_wakeup_granularity);
361 P(sysctl_sched_child_runs_first);
362 P(sysctl_sched_features);
363#undef PN
364#undef P
365
366 SEQ_printf(m, " .%-40s: %d (%s)\n", "sysctl_sched_tunable_scaling",
367 sysctl_sched_tunable_scaling,
368 sched_tunable_scaling_names[sysctl_sched_tunable_scaling]);
369
370 for_each_online_cpu(cpu)
371 print_cpu(m, cpu);
372
373 SEQ_printf(m, "\n");
374
375 return 0;
376}
377
378void sysrq_sched_debug_show(void)
379{
380 sched_debug_show(NULL, NULL);
381}
382
383static int sched_debug_open(struct inode *inode, struct file *filp)
384{
385 return single_open(filp, sched_debug_show, NULL);
386}
387
388static const struct file_operations sched_debug_fops = {
389 .open = sched_debug_open,
390 .read = seq_read,
391 .llseek = seq_lseek,
392 .release = single_release,
393};
394
395static int __init init_sched_debug_procfs(void)
396{
397 struct proc_dir_entry *pe;
398
399 pe = proc_create("sched_debug", 0444, NULL, &sched_debug_fops);
400 if (!pe)
401 return -ENOMEM;
402 return 0;
403}
404
405__initcall(init_sched_debug_procfs);
406
407void proc_sched_show_task(struct task_struct *p, struct seq_file *m)
408{
409 unsigned long nr_switches;
410
411 SEQ_printf(m, "%s (%d, #threads: %d)\n", p->comm, p->pid,
412 get_nr_threads(p));
413 SEQ_printf(m,
414 "---------------------------------------------------------\n");
415#define __P(F) \
416 SEQ_printf(m, "%-35s:%21Ld\n", #F, (long long)F)
417#define P(F) \
418 SEQ_printf(m, "%-35s:%21Ld\n", #F, (long long)p->F)
419#define __PN(F) \
420 SEQ_printf(m, "%-35s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)F))
421#define PN(F) \
422 SEQ_printf(m, "%-35s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)p->F))
423
424 PN(se.exec_start);
425 PN(se.vruntime);
426 PN(se.sum_exec_runtime);
427
428 nr_switches = p->nvcsw + p->nivcsw;
429
430#ifdef CONFIG_SCHEDSTATS
431 PN(se.statistics.wait_start);
432 PN(se.statistics.sleep_start);
433 PN(se.statistics.block_start);
434 PN(se.statistics.sleep_max);
435 PN(se.statistics.block_max);
436 PN(se.statistics.exec_max);
437 PN(se.statistics.slice_max);
438 PN(se.statistics.wait_max);
439 PN(se.statistics.wait_sum);
440 P(se.statistics.wait_count);
441 PN(se.statistics.iowait_sum);
442 P(se.statistics.iowait_count);
443 P(se.nr_migrations);
444 P(se.statistics.nr_migrations_cold);
445 P(se.statistics.nr_failed_migrations_affine);
446 P(se.statistics.nr_failed_migrations_running);
447 P(se.statistics.nr_failed_migrations_hot);
448 P(se.statistics.nr_forced_migrations);
449 P(se.statistics.nr_wakeups);
450 P(se.statistics.nr_wakeups_sync);
451 P(se.statistics.nr_wakeups_migrate);
452 P(se.statistics.nr_wakeups_local);
453 P(se.statistics.nr_wakeups_remote);
454 P(se.statistics.nr_wakeups_affine);
455 P(se.statistics.nr_wakeups_affine_attempts);
456 P(se.statistics.nr_wakeups_passive);
457 P(se.statistics.nr_wakeups_idle);
458
459 {
460 u64 avg_atom, avg_per_cpu;
461
462 avg_atom = p->se.sum_exec_runtime;
463 if (nr_switches)
464 do_div(avg_atom, nr_switches);
465 else
466 avg_atom = -1LL;
467
468 avg_per_cpu = p->se.sum_exec_runtime;
469 if (p->se.nr_migrations) {
470 avg_per_cpu = div64_u64(avg_per_cpu,
471 p->se.nr_migrations);
472 } else {
473 avg_per_cpu = -1LL;
474 }
475
476 __PN(avg_atom);
477 __PN(avg_per_cpu);
478 }
479#endif
480 __P(nr_switches);
481 SEQ_printf(m, "%-35s:%21Ld\n",
482 "nr_voluntary_switches", (long long)p->nvcsw);
483 SEQ_printf(m, "%-35s:%21Ld\n",
484 "nr_involuntary_switches", (long long)p->nivcsw);
485
486 P(se.load.weight);
487 P(policy);
488 P(prio);
489#undef PN
490#undef __PN
491#undef P
492#undef __P
493
494 {
495 unsigned int this_cpu = raw_smp_processor_id();
496 u64 t0, t1;
497
498 t0 = cpu_clock(this_cpu);
499 t1 = cpu_clock(this_cpu);
500 SEQ_printf(m, "%-35s:%21Ld\n",
501 "clock-delta", (long long)(t1-t0));
502 }
503}
504
505void proc_sched_set_task(struct task_struct *p)
506{
507#ifdef CONFIG_SCHEDSTATS
508 memset(&p->se.statistics, 0, sizeof(p->se.statistics));
509#endif
510}
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