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 | ||
43ae34cb | 56 | static void |
a48da48b | 57 | print_task(struct seq_file *m, struct rq *rq, struct task_struct *p) |
43ae34cb IM |
58 | { |
59 | if (rq->curr == p) | |
60 | SEQ_printf(m, "R"); | |
61 | else | |
62 | SEQ_printf(m, " "); | |
63 | ||
ef83a571 | 64 | SEQ_printf(m, "%15s %5d %9Ld.%06ld %9Ld %5d ", |
43ae34cb | 65 | p->comm, p->pid, |
ef83a571 | 66 | SPLIT_NS(p->se.vruntime), |
43ae34cb | 67 | (long long)(p->nvcsw + p->nivcsw), |
6f605d83 | 68 | p->prio); |
6cfb0d5d | 69 | #ifdef CONFIG_SCHEDSTATS |
d19ca308 | 70 | SEQ_printf(m, "%9Ld.%06ld %9Ld.%06ld %9Ld.%06ld", |
ef83a571 IM |
71 | SPLIT_NS(p->se.vruntime), |
72 | SPLIT_NS(p->se.sum_exec_runtime), | |
73 | SPLIT_NS(p->se.sum_sleep_runtime)); | |
6cfb0d5d | 74 | #else |
d19ca308 | 75 | SEQ_printf(m, "%15Ld %15Ld %15Ld.%06ld %15Ld.%06ld %15Ld.%06ld", |
ef83a571 | 76 | 0LL, 0LL, 0LL, 0L, 0LL, 0L, 0LL, 0L); |
6cfb0d5d | 77 | #endif |
d19ca308 PZ |
78 | |
79 | #ifdef CONFIG_CGROUP_SCHED | |
80 | { | |
81 | char path[64]; | |
82 | ||
83 | cgroup_path(task_group(p)->css.cgroup, path, sizeof(path)); | |
84 | SEQ_printf(m, " %s", path); | |
85 | } | |
86 | #endif | |
87 | SEQ_printf(m, "\n"); | |
43ae34cb IM |
88 | } |
89 | ||
a48da48b | 90 | static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu) |
43ae34cb IM |
91 | { |
92 | struct task_struct *g, *p; | |
ab63a633 | 93 | unsigned long flags; |
43ae34cb IM |
94 | |
95 | SEQ_printf(m, | |
96 | "\nrunnable tasks:\n" | |
c86da3a3 MG |
97 | " task PID tree-key switches prio" |
98 | " exec-runtime sum-exec sum-sleep\n" | |
1a75b94f | 99 | "------------------------------------------------------" |
c86da3a3 | 100 | "----------------------------------------------------\n"); |
43ae34cb | 101 | |
ab63a633 | 102 | read_lock_irqsave(&tasklist_lock, flags); |
43ae34cb IM |
103 | |
104 | do_each_thread(g, p) { | |
105 | if (!p->se.on_rq || task_cpu(p) != rq_cpu) | |
106 | continue; | |
107 | ||
a48da48b | 108 | print_task(m, rq, p); |
43ae34cb IM |
109 | } while_each_thread(g, p); |
110 | ||
ab63a633 | 111 | read_unlock_irqrestore(&tasklist_lock, flags); |
43ae34cb IM |
112 | } |
113 | ||
5cef9eca | 114 | void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq) |
43ae34cb | 115 | { |
86d9560c IM |
116 | s64 MIN_vruntime = -1, min_vruntime, max_vruntime = -1, |
117 | spread, rq0_min_vruntime, spread0; | |
67e12eac IM |
118 | struct rq *rq = &per_cpu(runqueues, cpu); |
119 | struct sched_entity *last; | |
120 | unsigned long flags; | |
121 | ||
486fdae2 | 122 | #if !defined(CONFIG_CGROUP_SCHED) || !defined(CONFIG_USER_SCHED) |
d19ca308 PZ |
123 | SEQ_printf(m, "\ncfs_rq[%d]:\n", cpu); |
124 | #else | |
125 | char path[128] = ""; | |
126 | struct cgroup *cgroup = NULL; | |
127 | struct task_group *tg = cfs_rq->tg; | |
128 | ||
129 | if (tg) | |
130 | cgroup = tg->css.cgroup; | |
131 | ||
132 | if (cgroup) | |
133 | cgroup_path(cgroup, path, sizeof(path)); | |
134 | ||
135 | SEQ_printf(m, "\ncfs_rq[%d]:%s\n", cpu, path); | |
136 | #endif | |
43ae34cb | 137 | |
ef83a571 IM |
138 | SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "exec_clock", |
139 | SPLIT_NS(cfs_rq->exec_clock)); | |
67e12eac IM |
140 | |
141 | spin_lock_irqsave(&rq->lock, flags); | |
142 | if (cfs_rq->rb_leftmost) | |
143 | MIN_vruntime = (__pick_next_entity(cfs_rq))->vruntime; | |
144 | last = __pick_last_entity(cfs_rq); | |
145 | if (last) | |
146 | max_vruntime = last->vruntime; | |
86d9560c IM |
147 | min_vruntime = rq->cfs.min_vruntime; |
148 | rq0_min_vruntime = per_cpu(runqueues, 0).cfs.min_vruntime; | |
67e12eac | 149 | spin_unlock_irqrestore(&rq->lock, flags); |
ef83a571 IM |
150 | SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "MIN_vruntime", |
151 | SPLIT_NS(MIN_vruntime)); | |
152 | SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "min_vruntime", | |
153 | SPLIT_NS(min_vruntime)); | |
154 | SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "max_vruntime", | |
155 | SPLIT_NS(max_vruntime)); | |
67e12eac | 156 | spread = max_vruntime - MIN_vruntime; |
ef83a571 IM |
157 | SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "spread", |
158 | SPLIT_NS(spread)); | |
86d9560c | 159 | spread0 = min_vruntime - rq0_min_vruntime; |
ef83a571 IM |
160 | SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "spread0", |
161 | SPLIT_NS(spread0)); | |
545f3b18 SV |
162 | SEQ_printf(m, " .%-30s: %ld\n", "nr_running", cfs_rq->nr_running); |
163 | SEQ_printf(m, " .%-30s: %ld\n", "load", cfs_rq->load.weight); | |
fdd71d13 | 164 | #ifdef CONFIG_SCHEDSTATS |
480b9434 | 165 | SEQ_printf(m, " .%-30s: %d\n", "bkl_count", |
2d72376b | 166 | rq->bkl_count); |
fdd71d13 | 167 | #endif |
ddc97297 PZ |
168 | SEQ_printf(m, " .%-30s: %ld\n", "nr_spread_over", |
169 | cfs_rq->nr_spread_over); | |
d19ca308 PZ |
170 | #ifdef CONFIG_FAIR_GROUP_SCHED |
171 | #ifdef CONFIG_SMP | |
172 | SEQ_printf(m, " .%-30s: %lu\n", "shares", cfs_rq->shares); | |
173 | #endif | |
174 | #endif | |
43ae34cb IM |
175 | } |
176 | ||
a48da48b | 177 | static void print_cpu(struct seq_file *m, int cpu) |
43ae34cb IM |
178 | { |
179 | struct rq *rq = &per_cpu(runqueues, cpu); | |
180 | ||
181 | #ifdef CONFIG_X86 | |
182 | { | |
183 | unsigned int freq = cpu_khz ? : 1; | |
184 | ||
185 | SEQ_printf(m, "\ncpu#%d, %u.%03u MHz\n", | |
186 | cpu, freq / 1000, (freq % 1000)); | |
187 | } | |
188 | #else | |
189 | SEQ_printf(m, "\ncpu#%d\n", cpu); | |
190 | #endif | |
191 | ||
192 | #define P(x) \ | |
193 | SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rq->x)) | |
ef83a571 IM |
194 | #define PN(x) \ |
195 | SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rq->x)) | |
43ae34cb IM |
196 | |
197 | P(nr_running); | |
198 | SEQ_printf(m, " .%-30s: %lu\n", "load", | |
495eca49 | 199 | rq->load.weight); |
43ae34cb IM |
200 | P(nr_switches); |
201 | P(nr_load_updates); | |
202 | P(nr_uninterruptible); | |
203 | SEQ_printf(m, " .%-30s: %lu\n", "jiffies", jiffies); | |
ef83a571 | 204 | PN(next_balance); |
43ae34cb | 205 | P(curr->pid); |
ef83a571 | 206 | PN(clock); |
43ae34cb IM |
207 | P(cpu_load[0]); |
208 | P(cpu_load[1]); | |
209 | P(cpu_load[2]); | |
210 | P(cpu_load[3]); | |
211 | P(cpu_load[4]); | |
212 | #undef P | |
ef83a571 | 213 | #undef PN |
43ae34cb | 214 | |
5cef9eca | 215 | print_cfs_stats(m, cpu); |
43ae34cb | 216 | |
a48da48b | 217 | print_rq(m, rq, cpu); |
43ae34cb IM |
218 | } |
219 | ||
220 | static int sched_debug_show(struct seq_file *m, void *v) | |
221 | { | |
222 | u64 now = ktime_to_ns(ktime_get()); | |
223 | int cpu; | |
224 | ||
f7b9329e | 225 | SEQ_printf(m, "Sched Debug Version: v0.07, %s %.*s\n", |
43ae34cb IM |
226 | init_utsname()->release, |
227 | (int)strcspn(init_utsname()->version, " "), | |
228 | init_utsname()->version); | |
229 | ||
ef83a571 | 230 | SEQ_printf(m, "now at %Lu.%06ld msecs\n", SPLIT_NS(now)); |
43ae34cb | 231 | |
1aa4731e | 232 | #define P(x) \ |
d822cece | 233 | SEQ_printf(m, " .%-40s: %Ld\n", #x, (long long)(x)) |
1aa4731e | 234 | #define PN(x) \ |
d822cece | 235 | SEQ_printf(m, " .%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x)) |
1aa4731e | 236 | PN(sysctl_sched_latency); |
b2be5e96 | 237 | PN(sysctl_sched_min_granularity); |
1aa4731e | 238 | PN(sysctl_sched_wakeup_granularity); |
1aa4731e IM |
239 | PN(sysctl_sched_child_runs_first); |
240 | P(sysctl_sched_features); | |
241 | #undef PN | |
242 | #undef P | |
243 | ||
43ae34cb | 244 | for_each_online_cpu(cpu) |
a48da48b | 245 | print_cpu(m, cpu); |
43ae34cb IM |
246 | |
247 | SEQ_printf(m, "\n"); | |
248 | ||
249 | return 0; | |
250 | } | |
251 | ||
f3373461 | 252 | static void sysrq_sched_debug_show(void) |
43ae34cb IM |
253 | { |
254 | sched_debug_show(NULL, NULL); | |
255 | } | |
256 | ||
257 | static int sched_debug_open(struct inode *inode, struct file *filp) | |
258 | { | |
259 | return single_open(filp, sched_debug_show, NULL); | |
260 | } | |
261 | ||
0dbee3a6 | 262 | static const struct file_operations sched_debug_fops = { |
43ae34cb IM |
263 | .open = sched_debug_open, |
264 | .read = seq_read, | |
265 | .llseek = seq_lseek, | |
5ea473a1 | 266 | .release = single_release, |
43ae34cb IM |
267 | }; |
268 | ||
269 | static int __init init_sched_debug_procfs(void) | |
270 | { | |
271 | struct proc_dir_entry *pe; | |
272 | ||
c33fff0a | 273 | pe = proc_create("sched_debug", 0644, NULL, &sched_debug_fops); |
43ae34cb IM |
274 | if (!pe) |
275 | return -ENOMEM; | |
43ae34cb IM |
276 | return 0; |
277 | } | |
278 | ||
279 | __initcall(init_sched_debug_procfs); | |
280 | ||
281 | void proc_sched_show_task(struct task_struct *p, struct seq_file *m) | |
282 | { | |
cc367732 | 283 | unsigned long nr_switches; |
43ae34cb IM |
284 | unsigned long flags; |
285 | int num_threads = 1; | |
286 | ||
287 | rcu_read_lock(); | |
288 | if (lock_task_sighand(p, &flags)) { | |
289 | num_threads = atomic_read(&p->signal->count); | |
290 | unlock_task_sighand(p, &flags); | |
291 | } | |
292 | rcu_read_unlock(); | |
293 | ||
294 | SEQ_printf(m, "%s (%d, #threads: %d)\n", p->comm, p->pid, num_threads); | |
2d92f227 IM |
295 | SEQ_printf(m, |
296 | "---------------------------------------------------------\n"); | |
cc367732 IM |
297 | #define __P(F) \ |
298 | SEQ_printf(m, "%-35s:%21Ld\n", #F, (long long)F) | |
43ae34cb | 299 | #define P(F) \ |
2d92f227 | 300 | SEQ_printf(m, "%-35s:%21Ld\n", #F, (long long)p->F) |
cc367732 IM |
301 | #define __PN(F) \ |
302 | SEQ_printf(m, "%-35s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)F)) | |
ef83a571 | 303 | #define PN(F) \ |
2d92f227 | 304 | SEQ_printf(m, "%-35s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)p->F)) |
43ae34cb | 305 | |
ef83a571 IM |
306 | PN(se.exec_start); |
307 | PN(se.vruntime); | |
308 | PN(se.sum_exec_runtime); | |
4ae7d5ce | 309 | PN(se.avg_overlap); |
6cfb0d5d | 310 | |
cc367732 IM |
311 | nr_switches = p->nvcsw + p->nivcsw; |
312 | ||
6cfb0d5d | 313 | #ifdef CONFIG_SCHEDSTATS |
ef83a571 IM |
314 | PN(se.wait_start); |
315 | PN(se.sleep_start); | |
316 | PN(se.block_start); | |
317 | PN(se.sleep_max); | |
318 | PN(se.block_max); | |
319 | PN(se.exec_max); | |
320 | PN(se.slice_max); | |
321 | PN(se.wait_max); | |
6d082592 AV |
322 | PN(se.wait_sum); |
323 | P(se.wait_count); | |
2d72376b | 324 | P(sched_info.bkl_count); |
cc367732 IM |
325 | P(se.nr_migrations); |
326 | P(se.nr_migrations_cold); | |
327 | P(se.nr_failed_migrations_affine); | |
328 | P(se.nr_failed_migrations_running); | |
329 | P(se.nr_failed_migrations_hot); | |
330 | P(se.nr_forced_migrations); | |
331 | P(se.nr_forced2_migrations); | |
332 | P(se.nr_wakeups); | |
333 | P(se.nr_wakeups_sync); | |
334 | P(se.nr_wakeups_migrate); | |
335 | P(se.nr_wakeups_local); | |
336 | P(se.nr_wakeups_remote); | |
337 | P(se.nr_wakeups_affine); | |
338 | P(se.nr_wakeups_affine_attempts); | |
339 | P(se.nr_wakeups_passive); | |
340 | P(se.nr_wakeups_idle); | |
341 | ||
342 | { | |
343 | u64 avg_atom, avg_per_cpu; | |
344 | ||
345 | avg_atom = p->se.sum_exec_runtime; | |
346 | if (nr_switches) | |
347 | do_div(avg_atom, nr_switches); | |
348 | else | |
349 | avg_atom = -1LL; | |
350 | ||
351 | avg_per_cpu = p->se.sum_exec_runtime; | |
c1a89740 | 352 | if (p->se.nr_migrations) { |
6f6d6a1a RZ |
353 | avg_per_cpu = div64_u64(avg_per_cpu, |
354 | p->se.nr_migrations); | |
c1a89740 | 355 | } else { |
cc367732 | 356 | avg_per_cpu = -1LL; |
c1a89740 | 357 | } |
cc367732 IM |
358 | |
359 | __PN(avg_atom); | |
360 | __PN(avg_per_cpu); | |
361 | } | |
6cfb0d5d | 362 | #endif |
cc367732 | 363 | __P(nr_switches); |
2d92f227 | 364 | SEQ_printf(m, "%-35s:%21Ld\n", |
cc367732 IM |
365 | "nr_voluntary_switches", (long long)p->nvcsw); |
366 | SEQ_printf(m, "%-35s:%21Ld\n", | |
367 | "nr_involuntary_switches", (long long)p->nivcsw); | |
368 | ||
43ae34cb IM |
369 | P(se.load.weight); |
370 | P(policy); | |
371 | P(prio); | |
ef83a571 | 372 | #undef PN |
cc367732 IM |
373 | #undef __PN |
374 | #undef P | |
375 | #undef __P | |
43ae34cb IM |
376 | |
377 | { | |
378 | u64 t0, t1; | |
379 | ||
380 | t0 = sched_clock(); | |
381 | t1 = sched_clock(); | |
2d92f227 | 382 | SEQ_printf(m, "%-35s:%21Ld\n", |
43ae34cb IM |
383 | "clock-delta", (long long)(t1-t0)); |
384 | } | |
385 | } | |
386 | ||
387 | void proc_sched_set_task(struct task_struct *p) | |
388 | { | |
6cfb0d5d | 389 | #ifdef CONFIG_SCHEDSTATS |
cc367732 | 390 | p->se.wait_max = 0; |
6d082592 AV |
391 | p->se.wait_sum = 0; |
392 | p->se.wait_count = 0; | |
cc367732 IM |
393 | p->se.sleep_max = 0; |
394 | p->se.sum_sleep_runtime = 0; | |
395 | p->se.block_max = 0; | |
396 | p->se.exec_max = 0; | |
397 | p->se.slice_max = 0; | |
398 | p->se.nr_migrations = 0; | |
399 | p->se.nr_migrations_cold = 0; | |
400 | p->se.nr_failed_migrations_affine = 0; | |
401 | p->se.nr_failed_migrations_running = 0; | |
402 | p->se.nr_failed_migrations_hot = 0; | |
403 | p->se.nr_forced_migrations = 0; | |
404 | p->se.nr_forced2_migrations = 0; | |
405 | p->se.nr_wakeups = 0; | |
406 | p->se.nr_wakeups_sync = 0; | |
407 | p->se.nr_wakeups_migrate = 0; | |
408 | p->se.nr_wakeups_local = 0; | |
409 | p->se.nr_wakeups_remote = 0; | |
410 | p->se.nr_wakeups_affine = 0; | |
411 | p->se.nr_wakeups_affine_attempts = 0; | |
412 | p->se.nr_wakeups_passive = 0; | |
413 | p->se.nr_wakeups_idle = 0; | |
414 | p->sched_info.bkl_count = 0; | |
6cfb0d5d | 415 | #endif |
cc367732 IM |
416 | p->se.sum_exec_runtime = 0; |
417 | p->se.prev_sum_exec_runtime = 0; | |
418 | p->nvcsw = 0; | |
419 | p->nivcsw = 0; | |
43ae34cb | 420 | } |