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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
20
21
22
23#define SEQ_printf(m, x...) \
24 do { \
25 if (m) \
26 seq_printf(m, x); \
27 else \
28 printk(x); \
29 } while (0)
30
31
32
33
34static long long nsec_high(unsigned long long nsec)
35{
36 if ((long long)nsec < 0) {
37 nsec = -nsec;
38 do_div(nsec, 1000000);
39 return -nsec;
40 }
41 do_div(nsec, 1000000);
42
43 return nsec;
44}
45
46static unsigned long nsec_low(unsigned long long nsec)
47{
48 if ((long long)nsec < 0)
49 nsec = -nsec;
50
51 return do_div(nsec, 1000000);
52}
53
54#define SPLIT_NS(x) nsec_high(x), nsec_low(x)
55
56#ifdef CONFIG_FAIR_GROUP_SCHED
57static void print_cfs_group_stats(struct seq_file *m, int cpu,
58 struct task_group *tg)
59{
60 struct sched_entity *se = tg->se[cpu];
61 if (!se)
62 return;
63
64#define P(F) \
65 SEQ_printf(m, " .%-30s: %lld\n", #F, (long long)F)
66#define PN(F) \
67 SEQ_printf(m, " .%-30s: %lld.%06ld\n", #F, SPLIT_NS((long long)F))
68
69 PN(se->exec_start);
70 PN(se->vruntime);
71 PN(se->sum_exec_runtime);
72#ifdef CONFIG_SCHEDSTATS
73 PN(se->wait_start);
74 PN(se->sleep_start);
75 PN(se->block_start);
76 PN(se->sleep_max);
77 PN(se->block_max);
78 PN(se->exec_max);
79 PN(se->slice_max);
80 PN(se->wait_max);
81 PN(se->wait_sum);
82 P(se->wait_count);
83#endif
84 P(se->load.weight);
85#undef PN
86#undef P
87}
88#endif
89
90static void
91print_task(struct seq_file *m, struct rq *rq, struct task_struct *p)
92{
93 if (rq->curr == p)
94 SEQ_printf(m, "R");
95 else
96 SEQ_printf(m, " ");
97
98 SEQ_printf(m, "%15s %5d %9Ld.%06ld %9Ld %5d ",
99 p->comm, p->pid,
100 SPLIT_NS(p->se.vruntime),
101 (long long)(p->nvcsw + p->nivcsw),
102 p->prio);
103#ifdef CONFIG_SCHEDSTATS
104 SEQ_printf(m, "%9Ld.%06ld %9Ld.%06ld %9Ld.%06ld",
105 SPLIT_NS(p->se.vruntime),
106 SPLIT_NS(p->se.sum_exec_runtime),
107 SPLIT_NS(p->se.sum_sleep_runtime));
108#else
109 SEQ_printf(m, "%15Ld %15Ld %15Ld.%06ld %15Ld.%06ld %15Ld.%06ld",
110 0LL, 0LL, 0LL, 0L, 0LL, 0L, 0LL, 0L);
111#endif
112
113#ifdef CONFIG_CGROUP_SCHED
114 {
115 char path[64];
116
117 rcu_read_lock();
118 cgroup_path(task_group(p)->css.cgroup, path, sizeof(path));
119 rcu_read_unlock();
120 SEQ_printf(m, " %s", path);
121 }
122#endif
123 SEQ_printf(m, "\n");
124}
125
126static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu)
127{
128 struct task_struct *g, *p;
129 unsigned long flags;
130
131 SEQ_printf(m,
132 "\nrunnable tasks:\n"
133 " task PID tree-key switches prio"
134 " exec-runtime sum-exec sum-sleep\n"
135 "------------------------------------------------------"
136 "----------------------------------------------------\n");
137
138 read_lock_irqsave(&tasklist_lock, flags);
139
140 do_each_thread(g, p) {
141 if (!p->se.on_rq || task_cpu(p) != rq_cpu)
142 continue;
143
144 print_task(m, rq, p);
145 } while_each_thread(g, p);
146
147 read_unlock_irqrestore(&tasklist_lock, flags);
148}
149
150#if defined(CONFIG_CGROUP_SCHED) && \
151 (defined(CONFIG_FAIR_GROUP_SCHED) || defined(CONFIG_RT_GROUP_SCHED))
152static void task_group_path(struct task_group *tg, char *buf, int buflen)
153{
154
155 if (!tg->css.cgroup) {
156 buf[0] = '\0';
157 return;
158 }
159 cgroup_path(tg->css.cgroup, buf, buflen);
160}
161#endif
162
163void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
164{
165 s64 MIN_vruntime = -1, min_vruntime, max_vruntime = -1,
166 spread, rq0_min_vruntime, spread0;
167 struct rq *rq = cpu_rq(cpu);
168 struct sched_entity *last;
169 unsigned long flags;
170
171#if defined(CONFIG_CGROUP_SCHED) && defined(CONFIG_FAIR_GROUP_SCHED)
172 char path[128];
173 struct task_group *tg = cfs_rq->tg;
174
175 task_group_path(tg, path, sizeof(path));
176
177 SEQ_printf(m, "\ncfs_rq[%d]:%s\n", cpu, path);
178#elif defined(CONFIG_USER_SCHED) && defined(CONFIG_FAIR_GROUP_SCHED)
179 {
180 uid_t uid = cfs_rq->tg->uid;
181 SEQ_printf(m, "\ncfs_rq[%d] for UID: %u\n", cpu, uid);
182 }
183#else
184 SEQ_printf(m, "\ncfs_rq[%d]:\n", cpu);
185#endif
186 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "exec_clock",
187 SPLIT_NS(cfs_rq->exec_clock));
188
189 raw_spin_lock_irqsave(&rq->lock, flags);
190 if (cfs_rq->rb_leftmost)
191 MIN_vruntime = (__pick_next_entity(cfs_rq))->vruntime;
192 last = __pick_last_entity(cfs_rq);
193 if (last)
194 max_vruntime = last->vruntime;
195 min_vruntime = cfs_rq->min_vruntime;
196 rq0_min_vruntime = cpu_rq(0)->cfs.min_vruntime;
197 raw_spin_unlock_irqrestore(&rq->lock, flags);
198 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "MIN_vruntime",
199 SPLIT_NS(MIN_vruntime));
200 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "min_vruntime",
201 SPLIT_NS(min_vruntime));
202 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "max_vruntime",
203 SPLIT_NS(max_vruntime));
204 spread = max_vruntime - MIN_vruntime;
205 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "spread",
206 SPLIT_NS(spread));
207 spread0 = min_vruntime - rq0_min_vruntime;
208 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "spread0",
209 SPLIT_NS(spread0));
210 SEQ_printf(m, " .%-30s: %ld\n", "nr_running", cfs_rq->nr_running);
211 SEQ_printf(m, " .%-30s: %ld\n", "load", cfs_rq->load.weight);
212
213 SEQ_printf(m, " .%-30s: %d\n", "nr_spread_over",
214 cfs_rq->nr_spread_over);
215#ifdef CONFIG_FAIR_GROUP_SCHED
216#ifdef CONFIG_SMP
217 SEQ_printf(m, " .%-30s: %lu\n", "shares", cfs_rq->shares);
218#endif
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#if defined(CONFIG_CGROUP_SCHED) && defined(CONFIG_RT_GROUP_SCHED)
226 char path[128];
227 struct task_group *tg = rt_rq->tg;
228
229 task_group_path(tg, path, sizeof(path));
230
231 SEQ_printf(m, "\nrt_rq[%d]:%s\n", cpu, path);
232#else
233 SEQ_printf(m, "\nrt_rq[%d]:\n", cpu);
234#endif
235
236
237#define P(x) \
238 SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rt_rq->x))
239#define PN(x) \
240 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rt_rq->x))
241
242 P(rt_nr_running);
243 P(rt_throttled);
244 PN(rt_time);
245 PN(rt_runtime);
246
247#undef PN
248#undef P
249}
250
251static void print_cpu(struct seq_file *m, int cpu)
252{
253 struct rq *rq = cpu_rq(cpu);
254
255#ifdef CONFIG_X86
256 {
257 unsigned int freq = cpu_khz ? : 1;
258
259 SEQ_printf(m, "\ncpu#%d, %u.%03u MHz\n",
260 cpu, freq / 1000, (freq % 1000));
261 }
262#else
263 SEQ_printf(m, "\ncpu#%d\n", cpu);
264#endif
265
266#define P(x) \
267 SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rq->x))
268#define PN(x) \
269 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rq->x))
270
271 P(nr_running);
272 SEQ_printf(m, " .%-30s: %lu\n", "load",
273 rq->load.weight);
274 P(nr_switches);
275 P(nr_load_updates);
276 P(nr_uninterruptible);
277 PN(next_balance);
278 P(curr->pid);
279 PN(clock);
280 P(cpu_load[0]);
281 P(cpu_load[1]);
282 P(cpu_load[2]);
283 P(cpu_load[3]);
284 P(cpu_load[4]);
285#undef P
286#undef PN
287
288#ifdef CONFIG_SCHEDSTATS
289#define P(n) SEQ_printf(m, " .%-30s: %d\n", #n, rq->n);
290#define P64(n) SEQ_printf(m, " .%-30s: %Ld\n", #n, rq->n);
291
292 P(yld_count);
293
294 P(sched_switch);
295 P(sched_count);
296 P(sched_goidle);
297#ifdef CONFIG_SMP
298 P64(avg_idle);
299#endif
300
301 P(ttwu_count);
302 P(ttwu_local);
303
304 P(bkl_count);
305
306#undef P
307#endif
308 print_cfs_stats(m, cpu);
309 print_rt_stats(m, cpu);
310
311 print_rq(m, rq, cpu);
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 now = ktime_to_ns(ktime_get());
323 int cpu;
324
325 SEQ_printf(m, "Sched Debug Version: v0.09, %s %.*s\n",
326 init_utsname()->release,
327 (int)strcspn(init_utsname()->version, " "),
328 init_utsname()->version);
329
330 SEQ_printf(m, "now at %Lu.%06ld msecs\n", SPLIT_NS(now));
331
332#define P(x) \
333 SEQ_printf(m, " .%-40s: %Ld\n", #x, (long long)(x))
334#define PN(x) \
335 SEQ_printf(m, " .%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x))
336 P(jiffies);
337 PN(sysctl_sched_latency);
338 PN(sysctl_sched_min_granularity);
339 PN(sysctl_sched_wakeup_granularity);
340 PN(sysctl_sched_child_runs_first);
341 P(sysctl_sched_features);
342#undef PN
343#undef P
344
345 SEQ_printf(m, " .%-40s: %d (%s)\n", "sysctl_sched_tunable_scaling",
346 sysctl_sched_tunable_scaling,
347 sched_tunable_scaling_names[sysctl_sched_tunable_scaling]);
348
349 for_each_online_cpu(cpu)
350 print_cpu(m, cpu);
351
352 SEQ_printf(m, "\n");
353
354 return 0;
355}
356
357static void sysrq_sched_debug_show(void)
358{
359 sched_debug_show(NULL, NULL);
360}
361
362static int sched_debug_open(struct inode *inode, struct file *filp)
363{
364 return single_open(filp, sched_debug_show, NULL);
365}
366
367static const struct file_operations sched_debug_fops = {
368 .open = sched_debug_open,
369 .read = seq_read,
370 .llseek = seq_lseek,
371 .release = single_release,
372};
373
374static int __init init_sched_debug_procfs(void)
375{
376 struct proc_dir_entry *pe;
377
378 pe = proc_create("sched_debug", 0444, NULL, &sched_debug_fops);
379 if (!pe)
380 return -ENOMEM;
381 return 0;
382}
383
384__initcall(init_sched_debug_procfs);
385
386void proc_sched_show_task(struct task_struct *p, struct seq_file *m)
387{
388 unsigned long nr_switches;
389 unsigned long flags;
390 int num_threads = 1;
391
392 if (lock_task_sighand(p, &flags)) {
393 num_threads = atomic_read(&p->signal->count);
394 unlock_task_sighand(p, &flags);
395 }
396
397 SEQ_printf(m, "%s (%d, #threads: %d)\n", p->comm, p->pid, num_threads);
398 SEQ_printf(m,
399 "---------------------------------------------------------\n");
400#define __P(F) \
401 SEQ_printf(m, "%-35s:%21Ld\n", #F, (long long)F)
402#define P(F) \
403 SEQ_printf(m, "%-35s:%21Ld\n", #F, (long long)p->F)
404#define __PN(F) \
405 SEQ_printf(m, "%-35s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)F))
406#define PN(F) \
407 SEQ_printf(m, "%-35s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)p->F))
408
409 PN(se.exec_start);
410 PN(se.vruntime);
411 PN(se.sum_exec_runtime);
412 PN(se.avg_overlap);
413 PN(se.avg_wakeup);
414
415 nr_switches = p->nvcsw + p->nivcsw;
416
417#ifdef CONFIG_SCHEDSTATS
418 PN(se.wait_start);
419 PN(se.sleep_start);
420 PN(se.block_start);
421 PN(se.sleep_max);
422 PN(se.block_max);
423 PN(se.exec_max);
424 PN(se.slice_max);
425 PN(se.wait_max);
426 PN(se.wait_sum);
427 P(se.wait_count);
428 PN(se.iowait_sum);
429 P(se.iowait_count);
430 P(sched_info.bkl_count);
431 P(se.nr_migrations);
432 P(se.nr_migrations_cold);
433 P(se.nr_failed_migrations_affine);
434 P(se.nr_failed_migrations_running);
435 P(se.nr_failed_migrations_hot);
436 P(se.nr_forced_migrations);
437 P(se.nr_wakeups);
438 P(se.nr_wakeups_sync);
439 P(se.nr_wakeups_migrate);
440 P(se.nr_wakeups_local);
441 P(se.nr_wakeups_remote);
442 P(se.nr_wakeups_affine);
443 P(se.nr_wakeups_affine_attempts);
444 P(se.nr_wakeups_passive);
445 P(se.nr_wakeups_idle);
446
447 {
448 u64 avg_atom, avg_per_cpu;
449
450 avg_atom = p->se.sum_exec_runtime;
451 if (nr_switches)
452 do_div(avg_atom, nr_switches);
453 else
454 avg_atom = -1LL;
455
456 avg_per_cpu = p->se.sum_exec_runtime;
457 if (p->se.nr_migrations) {
458 avg_per_cpu = div64_u64(avg_per_cpu,
459 p->se.nr_migrations);
460 } else {
461 avg_per_cpu = -1LL;
462 }
463
464 __PN(avg_atom);
465 __PN(avg_per_cpu);
466 }
467#endif
468 __P(nr_switches);
469 SEQ_printf(m, "%-35s:%21Ld\n",
470 "nr_voluntary_switches", (long long)p->nvcsw);
471 SEQ_printf(m, "%-35s:%21Ld\n",
472 "nr_involuntary_switches", (long long)p->nivcsw);
473
474 P(se.load.weight);
475 P(policy);
476 P(prio);
477#undef PN
478#undef __PN
479#undef P
480#undef __P
481
482 {
483 unsigned int this_cpu = raw_smp_processor_id();
484 u64 t0, t1;
485
486 t0 = cpu_clock(this_cpu);
487 t1 = cpu_clock(this_cpu);
488 SEQ_printf(m, "%-35s:%21Ld\n",
489 "clock-delta", (long long)(t1-t0));
490 }
491}
492
493void proc_sched_set_task(struct task_struct *p)
494{
495#ifdef CONFIG_SCHEDSTATS
496 p->se.wait_max = 0;
497 p->se.wait_sum = 0;
498 p->se.wait_count = 0;
499 p->se.iowait_sum = 0;
500 p->se.iowait_count = 0;
501 p->se.sleep_max = 0;
502 p->se.sum_sleep_runtime = 0;
503 p->se.block_max = 0;
504 p->se.exec_max = 0;
505 p->se.slice_max = 0;
506 p->se.nr_migrations = 0;
507 p->se.nr_migrations_cold = 0;
508 p->se.nr_failed_migrations_affine = 0;
509 p->se.nr_failed_migrations_running = 0;
510 p->se.nr_failed_migrations_hot = 0;
511 p->se.nr_forced_migrations = 0;
512 p->se.nr_wakeups = 0;
513 p->se.nr_wakeups_sync = 0;
514 p->se.nr_wakeups_migrate = 0;
515 p->se.nr_wakeups_local = 0;
516 p->se.nr_wakeups_remote = 0;
517 p->se.nr_wakeups_affine = 0;
518 p->se.nr_wakeups_affine_attempts = 0;
519 p->se.nr_wakeups_passive = 0;
520 p->se.nr_wakeups_idle = 0;
521 p->sched_info.bkl_count = 0;
522#endif
523}
524
