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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 | |
19 | static 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 | */ |
36 | static 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 | |
48 | static 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 |
59 | static 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 |
92 | static char group_path[PATH_MAX]; |
93 | |
94 | static 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 | |
111 | static void |
112 | print_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 | |
140 | static 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->se.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 | |
164 | void 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_next_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 | |
221 | void 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 | |
243 | extern __read_mostly int sched_clock_running; |
244 | |
245 | static 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 | SEQ_printf(m, " .%-30s: %d\n", "bkl_count", |
300 | rq->rq_sched_info.bkl_count); |
301 | |
302 | #undef P |
303 | #undef P64 |
304 | #endif |
305 | spin_lock_irqsave(&sched_debug_lock, flags); |
306 | print_cfs_stats(m, cpu); |
307 | print_rt_stats(m, cpu); |
308 | |
309 | rcu_read_lock(); |
310 | print_rq(m, rq, cpu); |
311 | rcu_read_unlock(); |
312 | spin_unlock_irqrestore(&sched_debug_lock, flags); |
313 | } |
314 | |
315 | static const char *sched_tunable_scaling_names[] = { |
316 | "none", |
317 | "logaritmic", |
318 | "linear" |
319 | }; |
320 | |
321 | static int sched_debug_show(struct seq_file *m, void *v) |
322 | { |
323 | u64 ktime, sched_clk, cpu_clk; |
324 | unsigned long flags; |
325 | int cpu; |
326 | |
327 | local_irq_save(flags); |
328 | ktime = ktime_to_ns(ktime_get()); |
329 | sched_clk = sched_clock(); |
330 | cpu_clk = local_clock(); |
331 | local_irq_restore(flags); |
332 | |
333 | SEQ_printf(m, "Sched Debug Version: v0.10, %s %.*s\n", |
334 | init_utsname()->release, |
335 | (int)strcspn(init_utsname()->version, " "), |
336 | init_utsname()->version); |
337 | |
338 | #define P(x) \ |
339 | SEQ_printf(m, "%-40s: %Ld\n", #x, (long long)(x)) |
340 | #define PN(x) \ |
341 | SEQ_printf(m, "%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x)) |
342 | PN(ktime); |
343 | PN(sched_clk); |
344 | PN(cpu_clk); |
345 | P(jiffies); |
346 | #ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK |
347 | P(sched_clock_stable); |
348 | #endif |
349 | #undef PN |
350 | #undef P |
351 | |
352 | SEQ_printf(m, "\n"); |
353 | SEQ_printf(m, "sysctl_sched\n"); |
354 | |
355 | #define P(x) \ |
356 | SEQ_printf(m, " .%-40s: %Ld\n", #x, (long long)(x)) |
357 | #define PN(x) \ |
358 | SEQ_printf(m, " .%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x)) |
359 | PN(sysctl_sched_latency); |
360 | PN(sysctl_sched_min_granularity); |
361 | PN(sysctl_sched_wakeup_granularity); |
362 | P(sysctl_sched_child_runs_first); |
363 | P(sysctl_sched_features); |
364 | #undef PN |
365 | #undef P |
366 | |
367 | SEQ_printf(m, " .%-40s: %d (%s)\n", "sysctl_sched_tunable_scaling", |
368 | sysctl_sched_tunable_scaling, |
369 | sched_tunable_scaling_names[sysctl_sched_tunable_scaling]); |
370 | |
371 | for_each_online_cpu(cpu) |
372 | print_cpu(m, cpu); |
373 | |
374 | SEQ_printf(m, "\n"); |
375 | |
376 | return 0; |
377 | } |
378 | |
379 | static void sysrq_sched_debug_show(void) |
380 | { |
381 | sched_debug_show(NULL, NULL); |
382 | } |
383 | |
384 | static int sched_debug_open(struct inode *inode, struct file *filp) |
385 | { |
386 | return single_open(filp, sched_debug_show, NULL); |
387 | } |
388 | |
389 | static const struct file_operations sched_debug_fops = { |
390 | .open = sched_debug_open, |
391 | .read = seq_read, |
392 | .llseek = seq_lseek, |
393 | .release = single_release, |
394 | }; |
395 | |
396 | static int __init init_sched_debug_procfs(void) |
397 | { |
398 | struct proc_dir_entry *pe; |
399 | |
400 | pe = proc_create("sched_debug", 0444, NULL, &sched_debug_fops); |
401 | if (!pe) |
402 | return -ENOMEM; |
403 | return 0; |
404 | } |
405 | |
406 | __initcall(init_sched_debug_procfs); |
407 | |
408 | void proc_sched_show_task(struct task_struct *p, struct seq_file *m) |
409 | { |
410 | unsigned long nr_switches; |
411 | |
412 | SEQ_printf(m, "%s (%d, #threads: %d)\n", p->comm, p->pid, |
413 | get_nr_threads(p)); |
414 | SEQ_printf(m, |
415 | "---------------------------------------------------------\n"); |
416 | #define __P(F) \ |
417 | SEQ_printf(m, "%-35s:%21Ld\n", #F, (long long)F) |
418 | #define P(F) \ |
419 | SEQ_printf(m, "%-35s:%21Ld\n", #F, (long long)p->F) |
420 | #define __PN(F) \ |
421 | SEQ_printf(m, "%-35s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)F)) |
422 | #define PN(F) \ |
423 | SEQ_printf(m, "%-35s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)p->F)) |
424 | |
425 | PN(se.exec_start); |
426 | PN(se.vruntime); |
427 | PN(se.sum_exec_runtime); |
428 | |
429 | nr_switches = p->nvcsw + p->nivcsw; |
430 | |
431 | #ifdef CONFIG_SCHEDSTATS |
432 | PN(se.statistics.wait_start); |
433 | PN(se.statistics.sleep_start); |
434 | PN(se.statistics.block_start); |
435 | PN(se.statistics.sleep_max); |
436 | PN(se.statistics.block_max); |
437 | PN(se.statistics.exec_max); |
438 | PN(se.statistics.slice_max); |
439 | PN(se.statistics.wait_max); |
440 | PN(se.statistics.wait_sum); |
441 | P(se.statistics.wait_count); |
442 | PN(se.statistics.iowait_sum); |
443 | P(se.statistics.iowait_count); |
444 | P(sched_info.bkl_count); |
445 | P(se.nr_migrations); |
446 | P(se.statistics.nr_migrations_cold); |
447 | P(se.statistics.nr_failed_migrations_affine); |
448 | P(se.statistics.nr_failed_migrations_running); |
449 | P(se.statistics.nr_failed_migrations_hot); |
450 | P(se.statistics.nr_forced_migrations); |
451 | P(se.statistics.nr_wakeups); |
452 | P(se.statistics.nr_wakeups_sync); |
453 | P(se.statistics.nr_wakeups_migrate); |
454 | P(se.statistics.nr_wakeups_local); |
455 | P(se.statistics.nr_wakeups_remote); |
456 | P(se.statistics.nr_wakeups_affine); |
457 | P(se.statistics.nr_wakeups_affine_attempts); |
458 | P(se.statistics.nr_wakeups_passive); |
459 | P(se.statistics.nr_wakeups_idle); |
460 | |
461 | { |
462 | u64 avg_atom, avg_per_cpu; |
463 | |
464 | avg_atom = p->se.sum_exec_runtime; |
465 | if (nr_switches) |
466 | do_div(avg_atom, nr_switches); |
467 | else |
468 | avg_atom = -1LL; |
469 | |
470 | avg_per_cpu = p->se.sum_exec_runtime; |
471 | if (p->se.nr_migrations) { |
472 | avg_per_cpu = div64_u64(avg_per_cpu, |
473 | p->se.nr_migrations); |
474 | } else { |
475 | avg_per_cpu = -1LL; |
476 | } |
477 | |
478 | __PN(avg_atom); |
479 | __PN(avg_per_cpu); |
480 | } |
481 | #endif |
482 | __P(nr_switches); |
483 | SEQ_printf(m, "%-35s:%21Ld\n", |
484 | "nr_voluntary_switches", (long long)p->nvcsw); |
485 | SEQ_printf(m, "%-35s:%21Ld\n", |
486 | "nr_involuntary_switches", (long long)p->nivcsw); |
487 | |
488 | P(se.load.weight); |
489 | P(policy); |
490 | P(prio); |
491 | #undef PN |
492 | #undef __PN |
493 | #undef P |
494 | #undef __P |
495 | |
496 | { |
497 | unsigned int this_cpu = raw_smp_processor_id(); |
498 | u64 t0, t1; |
499 | |
500 | t0 = cpu_clock(this_cpu); |
501 | t1 = cpu_clock(this_cpu); |
502 | SEQ_printf(m, "%-35s:%21Ld\n", |
503 | "clock-delta", (long long)(t1-t0)); |
504 | } |
505 | } |
506 | |
507 | void proc_sched_set_task(struct task_struct *p) |
508 | { |
509 | #ifdef CONFIG_SCHEDSTATS |
510 | memset(&p->se.statistics, 0, sizeof(p->se.statistics)); |
511 | #endif |
512 | } |
513 |
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