Commit | Line | Data |
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43ae34cb IM |
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 | /* | |
20 | * This allows printing both to /proc/sched_debug and | |
21 | * to the console | |
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 | ||
ef83a571 IM |
31 | /* |
32 | * Ease the printing of nsec fields: | |
33 | */ | |
90b2628f | 34 | static long long nsec_high(unsigned long long nsec) |
ef83a571 | 35 | { |
90b2628f | 36 | if ((long long)nsec < 0) { |
ef83a571 IM |
37 | nsec = -nsec; |
38 | do_div(nsec, 1000000); | |
39 | return -nsec; | |
40 | } | |
41 | do_div(nsec, 1000000); | |
42 | ||
43 | return nsec; | |
44 | } | |
45 | ||
90b2628f | 46 | static unsigned long nsec_low(unsigned long long nsec) |
ef83a571 | 47 | { |
90b2628f | 48 | if ((long long)nsec < 0) |
ef83a571 IM |
49 | nsec = -nsec; |
50 | ||
51 | return do_div(nsec, 1000000); | |
52 | } | |
53 | ||
54 | #define SPLIT_NS(x) nsec_high(x), nsec_low(x) | |
55 | ||
ff9b48c3 | 56 | #ifdef CONFIG_FAIR_GROUP_SCHED |
5091faa4 | 57 | static void print_cfs_group_stats(struct seq_file *m, int cpu, struct task_group *tg) |
ff9b48c3 BR |
58 | { |
59 | struct sched_entity *se = tg->se[cpu]; | |
60 | if (!se) | |
61 | return; | |
62 | ||
63 | #define P(F) \ | |
64 | SEQ_printf(m, " .%-30s: %lld\n", #F, (long long)F) | |
65 | #define PN(F) \ | |
66 | SEQ_printf(m, " .%-30s: %lld.%06ld\n", #F, SPLIT_NS((long long)F)) | |
67 | ||
68 | PN(se->exec_start); | |
69 | PN(se->vruntime); | |
70 | PN(se->sum_exec_runtime); | |
71 | #ifdef CONFIG_SCHEDSTATS | |
41acab88 LDM |
72 | PN(se->statistics.wait_start); |
73 | PN(se->statistics.sleep_start); | |
74 | PN(se->statistics.block_start); | |
75 | PN(se->statistics.sleep_max); | |
76 | PN(se->statistics.block_max); | |
77 | PN(se->statistics.exec_max); | |
78 | PN(se->statistics.slice_max); | |
79 | PN(se->statistics.wait_max); | |
80 | PN(se->statistics.wait_sum); | |
81 | P(se->statistics.wait_count); | |
ff9b48c3 BR |
82 | #endif |
83 | P(se->load.weight); | |
84 | #undef PN | |
85 | #undef P | |
86 | } | |
87 | #endif | |
88 | ||
43ae34cb | 89 | static void |
a48da48b | 90 | print_task(struct seq_file *m, struct rq *rq, struct task_struct *p) |
43ae34cb IM |
91 | { |
92 | if (rq->curr == p) | |
93 | SEQ_printf(m, "R"); | |
94 | else | |
95 | SEQ_printf(m, " "); | |
96 | ||
ef83a571 | 97 | SEQ_printf(m, "%15s %5d %9Ld.%06ld %9Ld %5d ", |
43ae34cb | 98 | p->comm, p->pid, |
ef83a571 | 99 | SPLIT_NS(p->se.vruntime), |
43ae34cb | 100 | (long long)(p->nvcsw + p->nivcsw), |
6f605d83 | 101 | p->prio); |
6cfb0d5d | 102 | #ifdef CONFIG_SCHEDSTATS |
d19ca308 | 103 | SEQ_printf(m, "%9Ld.%06ld %9Ld.%06ld %9Ld.%06ld", |
ef83a571 IM |
104 | SPLIT_NS(p->se.vruntime), |
105 | SPLIT_NS(p->se.sum_exec_runtime), | |
41acab88 | 106 | SPLIT_NS(p->se.statistics.sum_sleep_runtime)); |
6cfb0d5d | 107 | #else |
d19ca308 | 108 | SEQ_printf(m, "%15Ld %15Ld %15Ld.%06ld %15Ld.%06ld %15Ld.%06ld", |
ef83a571 | 109 | 0LL, 0LL, 0LL, 0L, 0LL, 0L, 0LL, 0L); |
6cfb0d5d | 110 | #endif |
d19ca308 | 111 | |
d19ca308 | 112 | SEQ_printf(m, "\n"); |
43ae34cb IM |
113 | } |
114 | ||
a48da48b | 115 | static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu) |
43ae34cb IM |
116 | { |
117 | struct task_struct *g, *p; | |
ab63a633 | 118 | unsigned long flags; |
43ae34cb IM |
119 | |
120 | SEQ_printf(m, | |
121 | "\nrunnable tasks:\n" | |
c86da3a3 MG |
122 | " task PID tree-key switches prio" |
123 | " exec-runtime sum-exec sum-sleep\n" | |
1a75b94f | 124 | "------------------------------------------------------" |
c86da3a3 | 125 | "----------------------------------------------------\n"); |
43ae34cb | 126 | |
ab63a633 | 127 | read_lock_irqsave(&tasklist_lock, flags); |
43ae34cb IM |
128 | |
129 | do_each_thread(g, p) { | |
130 | if (!p->se.on_rq || task_cpu(p) != rq_cpu) | |
131 | continue; | |
132 | ||
a48da48b | 133 | print_task(m, rq, p); |
43ae34cb IM |
134 | } while_each_thread(g, p); |
135 | ||
ab63a633 | 136 | read_unlock_irqrestore(&tasklist_lock, flags); |
43ae34cb IM |
137 | } |
138 | ||
5cef9eca | 139 | void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq) |
43ae34cb | 140 | { |
86d9560c IM |
141 | s64 MIN_vruntime = -1, min_vruntime, max_vruntime = -1, |
142 | spread, rq0_min_vruntime, spread0; | |
348ec61e | 143 | struct rq *rq = cpu_rq(cpu); |
67e12eac IM |
144 | struct sched_entity *last; |
145 | unsigned long flags; | |
146 | ||
ada18de2 | 147 | SEQ_printf(m, "\ncfs_rq[%d]:\n", cpu); |
ef83a571 IM |
148 | SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "exec_clock", |
149 | SPLIT_NS(cfs_rq->exec_clock)); | |
67e12eac | 150 | |
05fa785c | 151 | raw_spin_lock_irqsave(&rq->lock, flags); |
67e12eac IM |
152 | if (cfs_rq->rb_leftmost) |
153 | MIN_vruntime = (__pick_next_entity(cfs_rq))->vruntime; | |
154 | last = __pick_last_entity(cfs_rq); | |
155 | if (last) | |
156 | max_vruntime = last->vruntime; | |
5ac5c4d6 | 157 | min_vruntime = cfs_rq->min_vruntime; |
348ec61e | 158 | rq0_min_vruntime = cpu_rq(0)->cfs.min_vruntime; |
05fa785c | 159 | raw_spin_unlock_irqrestore(&rq->lock, flags); |
ef83a571 IM |
160 | SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "MIN_vruntime", |
161 | SPLIT_NS(MIN_vruntime)); | |
162 | SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "min_vruntime", | |
163 | SPLIT_NS(min_vruntime)); | |
164 | SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "max_vruntime", | |
165 | SPLIT_NS(max_vruntime)); | |
67e12eac | 166 | spread = max_vruntime - MIN_vruntime; |
ef83a571 IM |
167 | SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "spread", |
168 | SPLIT_NS(spread)); | |
86d9560c | 169 | spread0 = min_vruntime - rq0_min_vruntime; |
ef83a571 IM |
170 | SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "spread0", |
171 | SPLIT_NS(spread0)); | |
5ac5c4d6 | 172 | SEQ_printf(m, " .%-30s: %d\n", "nr_spread_over", |
ddc97297 | 173 | cfs_rq->nr_spread_over); |
2069dd75 PZ |
174 | SEQ_printf(m, " .%-30s: %ld\n", "nr_running", cfs_rq->nr_running); |
175 | SEQ_printf(m, " .%-30s: %ld\n", "load", cfs_rq->load.weight); | |
c09595f6 PZ |
176 | #ifdef CONFIG_FAIR_GROUP_SCHED |
177 | #ifdef CONFIG_SMP | |
2069dd75 PZ |
178 | SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "load_avg", |
179 | SPLIT_NS(cfs_rq->load_avg)); | |
180 | SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "load_period", | |
181 | SPLIT_NS(cfs_rq->load_period)); | |
182 | SEQ_printf(m, " .%-30s: %ld\n", "load_contrib", | |
183 | cfs_rq->load_contribution); | |
184 | SEQ_printf(m, " .%-30s: %d\n", "load_tg", | |
5091faa4 | 185 | atomic_read(&cfs_rq->tg->load_weight)); |
c09595f6 | 186 | #endif |
2069dd75 | 187 | |
ff9b48c3 | 188 | print_cfs_group_stats(m, cpu, cfs_rq->tg); |
c09595f6 | 189 | #endif |
43ae34cb IM |
190 | } |
191 | ||
ada18de2 PZ |
192 | void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq) |
193 | { | |
ada18de2 | 194 | SEQ_printf(m, "\nrt_rq[%d]:\n", cpu); |
ada18de2 PZ |
195 | |
196 | #define P(x) \ | |
197 | SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rt_rq->x)) | |
198 | #define PN(x) \ | |
199 | SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rt_rq->x)) | |
200 | ||
201 | P(rt_nr_running); | |
202 | P(rt_throttled); | |
203 | PN(rt_time); | |
204 | PN(rt_runtime); | |
205 | ||
206 | #undef PN | |
207 | #undef P | |
208 | } | |
209 | ||
5bb6b1ea PZ |
210 | extern __read_mostly int sched_clock_running; |
211 | ||
a48da48b | 212 | static void print_cpu(struct seq_file *m, int cpu) |
43ae34cb | 213 | { |
348ec61e | 214 | struct rq *rq = cpu_rq(cpu); |
43ae34cb IM |
215 | |
216 | #ifdef CONFIG_X86 | |
217 | { | |
218 | unsigned int freq = cpu_khz ? : 1; | |
219 | ||
220 | SEQ_printf(m, "\ncpu#%d, %u.%03u MHz\n", | |
221 | cpu, freq / 1000, (freq % 1000)); | |
222 | } | |
223 | #else | |
224 | SEQ_printf(m, "\ncpu#%d\n", cpu); | |
225 | #endif | |
226 | ||
227 | #define P(x) \ | |
228 | SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rq->x)) | |
ef83a571 IM |
229 | #define PN(x) \ |
230 | SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rq->x)) | |
43ae34cb IM |
231 | |
232 | P(nr_running); | |
233 | SEQ_printf(m, " .%-30s: %lu\n", "load", | |
495eca49 | 234 | rq->load.weight); |
43ae34cb IM |
235 | P(nr_switches); |
236 | P(nr_load_updates); | |
237 | P(nr_uninterruptible); | |
ef83a571 | 238 | PN(next_balance); |
43ae34cb | 239 | P(curr->pid); |
ef83a571 | 240 | PN(clock); |
43ae34cb IM |
241 | P(cpu_load[0]); |
242 | P(cpu_load[1]); | |
243 | P(cpu_load[2]); | |
244 | P(cpu_load[3]); | |
245 | P(cpu_load[4]); | |
246 | #undef P | |
ef83a571 | 247 | #undef PN |
43ae34cb | 248 | |
5ac5c4d6 PZ |
249 | #ifdef CONFIG_SCHEDSTATS |
250 | #define P(n) SEQ_printf(m, " .%-30s: %d\n", #n, rq->n); | |
1b9508f6 | 251 | #define P64(n) SEQ_printf(m, " .%-30s: %Ld\n", #n, rq->n); |
5ac5c4d6 | 252 | |
5ac5c4d6 PZ |
253 | P(yld_count); |
254 | ||
255 | P(sched_switch); | |
256 | P(sched_count); | |
257 | P(sched_goidle); | |
1b9508f6 MG |
258 | #ifdef CONFIG_SMP |
259 | P64(avg_idle); | |
260 | #endif | |
5ac5c4d6 PZ |
261 | |
262 | P(ttwu_count); | |
263 | P(ttwu_local); | |
264 | ||
265 | P(bkl_count); | |
266 | ||
267 | #undef P | |
268 | #endif | |
5cef9eca | 269 | print_cfs_stats(m, cpu); |
ada18de2 | 270 | print_rt_stats(m, cpu); |
43ae34cb | 271 | |
a48da48b | 272 | print_rq(m, rq, cpu); |
43ae34cb IM |
273 | } |
274 | ||
1983a922 CE |
275 | static const char *sched_tunable_scaling_names[] = { |
276 | "none", | |
277 | "logaritmic", | |
278 | "linear" | |
279 | }; | |
280 | ||
43ae34cb IM |
281 | static int sched_debug_show(struct seq_file *m, void *v) |
282 | { | |
5bb6b1ea PZ |
283 | u64 ktime, sched_clk, cpu_clk; |
284 | unsigned long flags; | |
43ae34cb IM |
285 | int cpu; |
286 | ||
5bb6b1ea PZ |
287 | local_irq_save(flags); |
288 | ktime = ktime_to_ns(ktime_get()); | |
289 | sched_clk = sched_clock(); | |
290 | cpu_clk = local_clock(); | |
291 | local_irq_restore(flags); | |
292 | ||
293 | SEQ_printf(m, "Sched Debug Version: v0.10, %s %.*s\n", | |
43ae34cb IM |
294 | init_utsname()->release, |
295 | (int)strcspn(init_utsname()->version, " "), | |
296 | init_utsname()->version); | |
297 | ||
5bb6b1ea PZ |
298 | #define P(x) \ |
299 | SEQ_printf(m, "%-40s: %Ld\n", #x, (long long)(x)) | |
300 | #define PN(x) \ | |
301 | SEQ_printf(m, "%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x)) | |
302 | PN(ktime); | |
303 | PN(sched_clk); | |
304 | PN(cpu_clk); | |
305 | P(jiffies); | |
306 | #ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK | |
307 | P(sched_clock_stable); | |
308 | #endif | |
309 | #undef PN | |
310 | #undef P | |
311 | ||
312 | SEQ_printf(m, "\n"); | |
313 | SEQ_printf(m, "sysctl_sched\n"); | |
43ae34cb | 314 | |
1aa4731e | 315 | #define P(x) \ |
d822cece | 316 | SEQ_printf(m, " .%-40s: %Ld\n", #x, (long long)(x)) |
1aa4731e | 317 | #define PN(x) \ |
d822cece | 318 | SEQ_printf(m, " .%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x)) |
1aa4731e | 319 | PN(sysctl_sched_latency); |
b2be5e96 | 320 | PN(sysctl_sched_min_granularity); |
1aa4731e | 321 | PN(sysctl_sched_wakeup_granularity); |
eebef746 | 322 | P(sysctl_sched_child_runs_first); |
1aa4731e IM |
323 | P(sysctl_sched_features); |
324 | #undef PN | |
325 | #undef P | |
326 | ||
1983a922 CE |
327 | SEQ_printf(m, " .%-40s: %d (%s)\n", "sysctl_sched_tunable_scaling", |
328 | sysctl_sched_tunable_scaling, | |
329 | sched_tunable_scaling_names[sysctl_sched_tunable_scaling]); | |
330 | ||
43ae34cb | 331 | for_each_online_cpu(cpu) |
a48da48b | 332 | print_cpu(m, cpu); |
43ae34cb IM |
333 | |
334 | SEQ_printf(m, "\n"); | |
335 | ||
336 | return 0; | |
337 | } | |
338 | ||
f3373461 | 339 | static void sysrq_sched_debug_show(void) |
43ae34cb IM |
340 | { |
341 | sched_debug_show(NULL, NULL); | |
342 | } | |
343 | ||
344 | static int sched_debug_open(struct inode *inode, struct file *filp) | |
345 | { | |
346 | return single_open(filp, sched_debug_show, NULL); | |
347 | } | |
348 | ||
0dbee3a6 | 349 | static const struct file_operations sched_debug_fops = { |
43ae34cb IM |
350 | .open = sched_debug_open, |
351 | .read = seq_read, | |
352 | .llseek = seq_lseek, | |
5ea473a1 | 353 | .release = single_release, |
43ae34cb IM |
354 | }; |
355 | ||
356 | static int __init init_sched_debug_procfs(void) | |
357 | { | |
358 | struct proc_dir_entry *pe; | |
359 | ||
a9cf4ddb | 360 | pe = proc_create("sched_debug", 0444, NULL, &sched_debug_fops); |
43ae34cb IM |
361 | if (!pe) |
362 | return -ENOMEM; | |
43ae34cb IM |
363 | return 0; |
364 | } | |
365 | ||
366 | __initcall(init_sched_debug_procfs); | |
367 | ||
368 | void proc_sched_show_task(struct task_struct *p, struct seq_file *m) | |
369 | { | |
cc367732 | 370 | unsigned long nr_switches; |
43ae34cb | 371 | |
5089a976 ON |
372 | SEQ_printf(m, "%s (%d, #threads: %d)\n", p->comm, p->pid, |
373 | get_nr_threads(p)); | |
2d92f227 IM |
374 | SEQ_printf(m, |
375 | "---------------------------------------------------------\n"); | |
cc367732 IM |
376 | #define __P(F) \ |
377 | SEQ_printf(m, "%-35s:%21Ld\n", #F, (long long)F) | |
43ae34cb | 378 | #define P(F) \ |
2d92f227 | 379 | SEQ_printf(m, "%-35s:%21Ld\n", #F, (long long)p->F) |
cc367732 IM |
380 | #define __PN(F) \ |
381 | SEQ_printf(m, "%-35s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)F)) | |
ef83a571 | 382 | #define PN(F) \ |
2d92f227 | 383 | SEQ_printf(m, "%-35s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)p->F)) |
43ae34cb | 384 | |
ef83a571 IM |
385 | PN(se.exec_start); |
386 | PN(se.vruntime); | |
387 | PN(se.sum_exec_runtime); | |
6cfb0d5d | 388 | |
cc367732 IM |
389 | nr_switches = p->nvcsw + p->nivcsw; |
390 | ||
6cfb0d5d | 391 | #ifdef CONFIG_SCHEDSTATS |
41acab88 LDM |
392 | PN(se.statistics.wait_start); |
393 | PN(se.statistics.sleep_start); | |
394 | PN(se.statistics.block_start); | |
395 | PN(se.statistics.sleep_max); | |
396 | PN(se.statistics.block_max); | |
397 | PN(se.statistics.exec_max); | |
398 | PN(se.statistics.slice_max); | |
399 | PN(se.statistics.wait_max); | |
400 | PN(se.statistics.wait_sum); | |
401 | P(se.statistics.wait_count); | |
402 | PN(se.statistics.iowait_sum); | |
403 | P(se.statistics.iowait_count); | |
2d72376b | 404 | P(sched_info.bkl_count); |
cc367732 | 405 | P(se.nr_migrations); |
41acab88 LDM |
406 | P(se.statistics.nr_migrations_cold); |
407 | P(se.statistics.nr_failed_migrations_affine); | |
408 | P(se.statistics.nr_failed_migrations_running); | |
409 | P(se.statistics.nr_failed_migrations_hot); | |
410 | P(se.statistics.nr_forced_migrations); | |
411 | P(se.statistics.nr_wakeups); | |
412 | P(se.statistics.nr_wakeups_sync); | |
413 | P(se.statistics.nr_wakeups_migrate); | |
414 | P(se.statistics.nr_wakeups_local); | |
415 | P(se.statistics.nr_wakeups_remote); | |
416 | P(se.statistics.nr_wakeups_affine); | |
417 | P(se.statistics.nr_wakeups_affine_attempts); | |
418 | P(se.statistics.nr_wakeups_passive); | |
419 | P(se.statistics.nr_wakeups_idle); | |
cc367732 IM |
420 | |
421 | { | |
422 | u64 avg_atom, avg_per_cpu; | |
423 | ||
424 | avg_atom = p->se.sum_exec_runtime; | |
425 | if (nr_switches) | |
426 | do_div(avg_atom, nr_switches); | |
427 | else | |
428 | avg_atom = -1LL; | |
429 | ||
430 | avg_per_cpu = p->se.sum_exec_runtime; | |
c1a89740 | 431 | if (p->se.nr_migrations) { |
6f6d6a1a RZ |
432 | avg_per_cpu = div64_u64(avg_per_cpu, |
433 | p->se.nr_migrations); | |
c1a89740 | 434 | } else { |
cc367732 | 435 | avg_per_cpu = -1LL; |
c1a89740 | 436 | } |
cc367732 IM |
437 | |
438 | __PN(avg_atom); | |
439 | __PN(avg_per_cpu); | |
440 | } | |
6cfb0d5d | 441 | #endif |
cc367732 | 442 | __P(nr_switches); |
2d92f227 | 443 | SEQ_printf(m, "%-35s:%21Ld\n", |
cc367732 IM |
444 | "nr_voluntary_switches", (long long)p->nvcsw); |
445 | SEQ_printf(m, "%-35s:%21Ld\n", | |
446 | "nr_involuntary_switches", (long long)p->nivcsw); | |
447 | ||
43ae34cb IM |
448 | P(se.load.weight); |
449 | P(policy); | |
450 | P(prio); | |
ef83a571 | 451 | #undef PN |
cc367732 IM |
452 | #undef __PN |
453 | #undef P | |
454 | #undef __P | |
43ae34cb IM |
455 | |
456 | { | |
29d7b90c | 457 | unsigned int this_cpu = raw_smp_processor_id(); |
43ae34cb IM |
458 | u64 t0, t1; |
459 | ||
29d7b90c IM |
460 | t0 = cpu_clock(this_cpu); |
461 | t1 = cpu_clock(this_cpu); | |
2d92f227 | 462 | SEQ_printf(m, "%-35s:%21Ld\n", |
43ae34cb IM |
463 | "clock-delta", (long long)(t1-t0)); |
464 | } | |
465 | } | |
466 | ||
467 | void proc_sched_set_task(struct task_struct *p) | |
468 | { | |
6cfb0d5d | 469 | #ifdef CONFIG_SCHEDSTATS |
41acab88 | 470 | memset(&p->se.statistics, 0, sizeof(p->se.statistics)); |
6cfb0d5d | 471 | #endif |
43ae34cb | 472 | } |