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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 |
c86da3a3 | 70 | SEQ_printf(m, "%9Ld.%06ld %9Ld.%06ld %9Ld.%06ld\n", |
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 |
ef83a571 IM |
75 | SEQ_printf(m, "%15Ld %15Ld %15Ld.%06ld %15Ld.%06ld %15Ld.%06ld\n", |
76 | 0LL, 0LL, 0LL, 0L, 0LL, 0L, 0LL, 0L); | |
6cfb0d5d | 77 | #endif |
43ae34cb IM |
78 | } |
79 | ||
a48da48b | 80 | static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu) |
43ae34cb IM |
81 | { |
82 | struct task_struct *g, *p; | |
ab63a633 | 83 | unsigned long flags; |
43ae34cb IM |
84 | |
85 | SEQ_printf(m, | |
86 | "\nrunnable tasks:\n" | |
c86da3a3 MG |
87 | " task PID tree-key switches prio" |
88 | " exec-runtime sum-exec sum-sleep\n" | |
1a75b94f | 89 | "------------------------------------------------------" |
c86da3a3 | 90 | "----------------------------------------------------\n"); |
43ae34cb | 91 | |
ab63a633 | 92 | read_lock_irqsave(&tasklist_lock, flags); |
43ae34cb IM |
93 | |
94 | do_each_thread(g, p) { | |
95 | if (!p->se.on_rq || task_cpu(p) != rq_cpu) | |
96 | continue; | |
97 | ||
a48da48b | 98 | print_task(m, rq, p); |
43ae34cb IM |
99 | } while_each_thread(g, p); |
100 | ||
ab63a633 | 101 | read_unlock_irqrestore(&tasklist_lock, flags); |
43ae34cb IM |
102 | } |
103 | ||
5cef9eca | 104 | void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq) |
43ae34cb | 105 | { |
86d9560c IM |
106 | s64 MIN_vruntime = -1, min_vruntime, max_vruntime = -1, |
107 | spread, rq0_min_vruntime, spread0; | |
67e12eac IM |
108 | struct rq *rq = &per_cpu(runqueues, cpu); |
109 | struct sched_entity *last; | |
110 | unsigned long flags; | |
111 | ||
5167e75f | 112 | SEQ_printf(m, "\ncfs_rq\n"); |
43ae34cb | 113 | |
ef83a571 IM |
114 | SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "exec_clock", |
115 | SPLIT_NS(cfs_rq->exec_clock)); | |
67e12eac IM |
116 | |
117 | spin_lock_irqsave(&rq->lock, flags); | |
118 | if (cfs_rq->rb_leftmost) | |
119 | MIN_vruntime = (__pick_next_entity(cfs_rq))->vruntime; | |
120 | last = __pick_last_entity(cfs_rq); | |
121 | if (last) | |
122 | max_vruntime = last->vruntime; | |
86d9560c IM |
123 | min_vruntime = rq->cfs.min_vruntime; |
124 | rq0_min_vruntime = per_cpu(runqueues, 0).cfs.min_vruntime; | |
67e12eac | 125 | spin_unlock_irqrestore(&rq->lock, flags); |
ef83a571 IM |
126 | SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "MIN_vruntime", |
127 | SPLIT_NS(MIN_vruntime)); | |
128 | SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "min_vruntime", | |
129 | SPLIT_NS(min_vruntime)); | |
130 | SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "max_vruntime", | |
131 | SPLIT_NS(max_vruntime)); | |
67e12eac | 132 | spread = max_vruntime - MIN_vruntime; |
ef83a571 IM |
133 | SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "spread", |
134 | SPLIT_NS(spread)); | |
86d9560c | 135 | spread0 = min_vruntime - rq0_min_vruntime; |
ef83a571 IM |
136 | SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "spread0", |
137 | SPLIT_NS(spread0)); | |
545f3b18 SV |
138 | SEQ_printf(m, " .%-30s: %ld\n", "nr_running", cfs_rq->nr_running); |
139 | SEQ_printf(m, " .%-30s: %ld\n", "load", cfs_rq->load.weight); | |
fdd71d13 | 140 | #ifdef CONFIG_SCHEDSTATS |
480b9434 | 141 | SEQ_printf(m, " .%-30s: %d\n", "bkl_count", |
2d72376b | 142 | rq->bkl_count); |
fdd71d13 | 143 | #endif |
ddc97297 PZ |
144 | SEQ_printf(m, " .%-30s: %ld\n", "nr_spread_over", |
145 | cfs_rq->nr_spread_over); | |
43ae34cb IM |
146 | } |
147 | ||
a48da48b | 148 | static void print_cpu(struct seq_file *m, int cpu) |
43ae34cb IM |
149 | { |
150 | struct rq *rq = &per_cpu(runqueues, cpu); | |
151 | ||
152 | #ifdef CONFIG_X86 | |
153 | { | |
154 | unsigned int freq = cpu_khz ? : 1; | |
155 | ||
156 | SEQ_printf(m, "\ncpu#%d, %u.%03u MHz\n", | |
157 | cpu, freq / 1000, (freq % 1000)); | |
158 | } | |
159 | #else | |
160 | SEQ_printf(m, "\ncpu#%d\n", cpu); | |
161 | #endif | |
162 | ||
163 | #define P(x) \ | |
164 | SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rq->x)) | |
ef83a571 IM |
165 | #define PN(x) \ |
166 | SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rq->x)) | |
43ae34cb IM |
167 | |
168 | P(nr_running); | |
169 | SEQ_printf(m, " .%-30s: %lu\n", "load", | |
495eca49 | 170 | rq->load.weight); |
43ae34cb IM |
171 | P(nr_switches); |
172 | P(nr_load_updates); | |
173 | P(nr_uninterruptible); | |
174 | SEQ_printf(m, " .%-30s: %lu\n", "jiffies", jiffies); | |
ef83a571 | 175 | PN(next_balance); |
43ae34cb | 176 | P(curr->pid); |
ef83a571 IM |
177 | PN(clock); |
178 | PN(idle_clock); | |
179 | PN(prev_clock_raw); | |
43ae34cb IM |
180 | P(clock_warps); |
181 | P(clock_overflows); | |
cc203d24 | 182 | P(clock_underflows); |
2aa44d05 | 183 | P(clock_deep_idle_events); |
ef83a571 | 184 | PN(clock_max_delta); |
43ae34cb IM |
185 | P(cpu_load[0]); |
186 | P(cpu_load[1]); | |
187 | P(cpu_load[2]); | |
188 | P(cpu_load[3]); | |
189 | P(cpu_load[4]); | |
190 | #undef P | |
ef83a571 | 191 | #undef PN |
43ae34cb | 192 | |
5cef9eca | 193 | print_cfs_stats(m, cpu); |
43ae34cb | 194 | |
a48da48b | 195 | print_rq(m, rq, cpu); |
43ae34cb IM |
196 | } |
197 | ||
198 | static int sched_debug_show(struct seq_file *m, void *v) | |
199 | { | |
200 | u64 now = ktime_to_ns(ktime_get()); | |
201 | int cpu; | |
202 | ||
f7b9329e | 203 | SEQ_printf(m, "Sched Debug Version: v0.07, %s %.*s\n", |
43ae34cb IM |
204 | init_utsname()->release, |
205 | (int)strcspn(init_utsname()->version, " "), | |
206 | init_utsname()->version); | |
207 | ||
ef83a571 | 208 | SEQ_printf(m, "now at %Lu.%06ld msecs\n", SPLIT_NS(now)); |
43ae34cb | 209 | |
1aa4731e | 210 | #define P(x) \ |
d822cece | 211 | SEQ_printf(m, " .%-40s: %Ld\n", #x, (long long)(x)) |
1aa4731e | 212 | #define PN(x) \ |
d822cece | 213 | SEQ_printf(m, " .%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x)) |
1aa4731e | 214 | PN(sysctl_sched_latency); |
b2be5e96 | 215 | PN(sysctl_sched_min_granularity); |
1aa4731e IM |
216 | PN(sysctl_sched_wakeup_granularity); |
217 | PN(sysctl_sched_batch_wakeup_granularity); | |
218 | PN(sysctl_sched_child_runs_first); | |
219 | P(sysctl_sched_features); | |
220 | #undef PN | |
221 | #undef P | |
222 | ||
43ae34cb | 223 | for_each_online_cpu(cpu) |
a48da48b | 224 | print_cpu(m, cpu); |
43ae34cb IM |
225 | |
226 | SEQ_printf(m, "\n"); | |
227 | ||
228 | return 0; | |
229 | } | |
230 | ||
f3373461 | 231 | static void sysrq_sched_debug_show(void) |
43ae34cb IM |
232 | { |
233 | sched_debug_show(NULL, NULL); | |
234 | } | |
235 | ||
236 | static int sched_debug_open(struct inode *inode, struct file *filp) | |
237 | { | |
238 | return single_open(filp, sched_debug_show, NULL); | |
239 | } | |
240 | ||
0dbee3a6 | 241 | static const struct file_operations sched_debug_fops = { |
43ae34cb IM |
242 | .open = sched_debug_open, |
243 | .read = seq_read, | |
244 | .llseek = seq_lseek, | |
5ea473a1 | 245 | .release = single_release, |
43ae34cb IM |
246 | }; |
247 | ||
248 | static int __init init_sched_debug_procfs(void) | |
249 | { | |
250 | struct proc_dir_entry *pe; | |
251 | ||
252 | pe = create_proc_entry("sched_debug", 0644, NULL); | |
253 | if (!pe) | |
254 | return -ENOMEM; | |
255 | ||
256 | pe->proc_fops = &sched_debug_fops; | |
257 | ||
258 | return 0; | |
259 | } | |
260 | ||
261 | __initcall(init_sched_debug_procfs); | |
262 | ||
263 | void proc_sched_show_task(struct task_struct *p, struct seq_file *m) | |
264 | { | |
cc367732 | 265 | unsigned long nr_switches; |
43ae34cb IM |
266 | unsigned long flags; |
267 | int num_threads = 1; | |
268 | ||
269 | rcu_read_lock(); | |
270 | if (lock_task_sighand(p, &flags)) { | |
271 | num_threads = atomic_read(&p->signal->count); | |
272 | unlock_task_sighand(p, &flags); | |
273 | } | |
274 | rcu_read_unlock(); | |
275 | ||
276 | SEQ_printf(m, "%s (%d, #threads: %d)\n", p->comm, p->pid, num_threads); | |
2d92f227 IM |
277 | SEQ_printf(m, |
278 | "---------------------------------------------------------\n"); | |
cc367732 IM |
279 | #define __P(F) \ |
280 | SEQ_printf(m, "%-35s:%21Ld\n", #F, (long long)F) | |
43ae34cb | 281 | #define P(F) \ |
2d92f227 | 282 | SEQ_printf(m, "%-35s:%21Ld\n", #F, (long long)p->F) |
cc367732 IM |
283 | #define __PN(F) \ |
284 | SEQ_printf(m, "%-35s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)F)) | |
ef83a571 | 285 | #define PN(F) \ |
2d92f227 | 286 | SEQ_printf(m, "%-35s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)p->F)) |
43ae34cb | 287 | |
ef83a571 IM |
288 | PN(se.exec_start); |
289 | PN(se.vruntime); | |
290 | PN(se.sum_exec_runtime); | |
6cfb0d5d | 291 | |
cc367732 IM |
292 | nr_switches = p->nvcsw + p->nivcsw; |
293 | ||
6cfb0d5d | 294 | #ifdef CONFIG_SCHEDSTATS |
ef83a571 IM |
295 | PN(se.wait_start); |
296 | PN(se.sleep_start); | |
297 | PN(se.block_start); | |
298 | PN(se.sleep_max); | |
299 | PN(se.block_max); | |
300 | PN(se.exec_max); | |
301 | PN(se.slice_max); | |
302 | PN(se.wait_max); | |
6d082592 AV |
303 | PN(se.wait_sum); |
304 | P(se.wait_count); | |
2d72376b | 305 | P(sched_info.bkl_count); |
cc367732 IM |
306 | P(se.nr_migrations); |
307 | P(se.nr_migrations_cold); | |
308 | P(se.nr_failed_migrations_affine); | |
309 | P(se.nr_failed_migrations_running); | |
310 | P(se.nr_failed_migrations_hot); | |
311 | P(se.nr_forced_migrations); | |
312 | P(se.nr_forced2_migrations); | |
313 | P(se.nr_wakeups); | |
314 | P(se.nr_wakeups_sync); | |
315 | P(se.nr_wakeups_migrate); | |
316 | P(se.nr_wakeups_local); | |
317 | P(se.nr_wakeups_remote); | |
318 | P(se.nr_wakeups_affine); | |
319 | P(se.nr_wakeups_affine_attempts); | |
320 | P(se.nr_wakeups_passive); | |
321 | P(se.nr_wakeups_idle); | |
322 | ||
323 | { | |
324 | u64 avg_atom, avg_per_cpu; | |
325 | ||
326 | avg_atom = p->se.sum_exec_runtime; | |
327 | if (nr_switches) | |
328 | do_div(avg_atom, nr_switches); | |
329 | else | |
330 | avg_atom = -1LL; | |
331 | ||
332 | avg_per_cpu = p->se.sum_exec_runtime; | |
c1a89740 IM |
333 | if (p->se.nr_migrations) { |
334 | avg_per_cpu = div64_64(avg_per_cpu, | |
335 | p->se.nr_migrations); | |
336 | } else { | |
cc367732 | 337 | avg_per_cpu = -1LL; |
c1a89740 | 338 | } |
cc367732 IM |
339 | |
340 | __PN(avg_atom); | |
341 | __PN(avg_per_cpu); | |
342 | } | |
6cfb0d5d | 343 | #endif |
cc367732 | 344 | __P(nr_switches); |
2d92f227 | 345 | SEQ_printf(m, "%-35s:%21Ld\n", |
cc367732 IM |
346 | "nr_voluntary_switches", (long long)p->nvcsw); |
347 | SEQ_printf(m, "%-35s:%21Ld\n", | |
348 | "nr_involuntary_switches", (long long)p->nivcsw); | |
349 | ||
43ae34cb IM |
350 | P(se.load.weight); |
351 | P(policy); | |
352 | P(prio); | |
ef83a571 | 353 | #undef PN |
cc367732 IM |
354 | #undef __PN |
355 | #undef P | |
356 | #undef __P | |
43ae34cb IM |
357 | |
358 | { | |
359 | u64 t0, t1; | |
360 | ||
361 | t0 = sched_clock(); | |
362 | t1 = sched_clock(); | |
2d92f227 | 363 | SEQ_printf(m, "%-35s:%21Ld\n", |
43ae34cb IM |
364 | "clock-delta", (long long)(t1-t0)); |
365 | } | |
366 | } | |
367 | ||
368 | void proc_sched_set_task(struct task_struct *p) | |
369 | { | |
6cfb0d5d | 370 | #ifdef CONFIG_SCHEDSTATS |
cc367732 | 371 | p->se.wait_max = 0; |
6d082592 AV |
372 | p->se.wait_sum = 0; |
373 | p->se.wait_count = 0; | |
cc367732 IM |
374 | p->se.sleep_max = 0; |
375 | p->se.sum_sleep_runtime = 0; | |
376 | p->se.block_max = 0; | |
377 | p->se.exec_max = 0; | |
378 | p->se.slice_max = 0; | |
379 | p->se.nr_migrations = 0; | |
380 | p->se.nr_migrations_cold = 0; | |
381 | p->se.nr_failed_migrations_affine = 0; | |
382 | p->se.nr_failed_migrations_running = 0; | |
383 | p->se.nr_failed_migrations_hot = 0; | |
384 | p->se.nr_forced_migrations = 0; | |
385 | p->se.nr_forced2_migrations = 0; | |
386 | p->se.nr_wakeups = 0; | |
387 | p->se.nr_wakeups_sync = 0; | |
388 | p->se.nr_wakeups_migrate = 0; | |
389 | p->se.nr_wakeups_local = 0; | |
390 | p->se.nr_wakeups_remote = 0; | |
391 | p->se.nr_wakeups_affine = 0; | |
392 | p->se.nr_wakeups_affine_attempts = 0; | |
393 | p->se.nr_wakeups_passive = 0; | |
394 | p->se.nr_wakeups_idle = 0; | |
395 | p->sched_info.bkl_count = 0; | |
6cfb0d5d | 396 | #endif |
cc367732 IM |
397 | p->se.sum_exec_runtime = 0; |
398 | p->se.prev_sum_exec_runtime = 0; | |
399 | p->nvcsw = 0; | |
400 | p->nivcsw = 0; | |
43ae34cb | 401 | } |