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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 | /* | |
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 | ||
31 | /* | |
32 | * Ease the printing of nsec fields: | |
33 | */ | |
34 | static long long nsec_high(long long nsec) | |
35 | { | |
36 | if (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 | ||
46 | static unsigned long nsec_low(long long nsec) | |
47 | { | |
48 | if (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 | static void | |
57 | print_task(struct seq_file *m, struct rq *rq, struct task_struct *p) | |
58 | { | |
59 | if (rq->curr == p) | |
60 | SEQ_printf(m, "R"); | |
61 | else | |
62 | SEQ_printf(m, " "); | |
63 | ||
64 | SEQ_printf(m, "%15s %5d %9Ld.%06ld %9Ld %5d ", | |
65 | p->comm, p->pid, | |
66 | SPLIT_NS(p->se.vruntime), | |
67 | (long long)(p->nvcsw + p->nivcsw), | |
68 | p->prio); | |
69 | #ifdef CONFIG_SCHEDSTATS | |
70 | SEQ_printf(m, "%9Ld.%06ld %9Ld.%06ld %9Ld.%06ld\n", | |
71 | SPLIT_NS(p->se.vruntime), | |
72 | SPLIT_NS(p->se.sum_exec_runtime), | |
73 | SPLIT_NS(p->se.sum_sleep_runtime)); | |
74 | #else | |
75 | SEQ_printf(m, "%15Ld %15Ld %15Ld.%06ld %15Ld.%06ld %15Ld.%06ld\n", | |
76 | 0LL, 0LL, 0LL, 0L, 0LL, 0L, 0LL, 0L); | |
77 | #endif | |
78 | } | |
79 | ||
80 | static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu) | |
81 | { | |
82 | struct task_struct *g, *p; | |
83 | unsigned long flags; | |
84 | ||
85 | SEQ_printf(m, | |
86 | "\nrunnable tasks:\n" | |
87 | " task PID tree-key switches prio" | |
88 | " exec-runtime sum-exec sum-sleep\n" | |
89 | "------------------------------------------------------" | |
90 | "----------------------------------------------------\n"); | |
91 | ||
92 | read_lock_irqsave(&tasklist_lock, flags); | |
93 | ||
94 | do_each_thread(g, p) { | |
95 | if (!p->se.on_rq || task_cpu(p) != rq_cpu) | |
96 | continue; | |
97 | ||
98 | print_task(m, rq, p); | |
99 | } while_each_thread(g, p); | |
100 | ||
101 | read_unlock_irqrestore(&tasklist_lock, flags); | |
102 | } | |
103 | ||
104 | void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq) | |
105 | { | |
106 | s64 MIN_vruntime = -1, min_vruntime, max_vruntime = -1, | |
107 | spread, rq0_min_vruntime, spread0; | |
108 | struct rq *rq = &per_cpu(runqueues, cpu); | |
109 | struct sched_entity *last; | |
110 | unsigned long flags; | |
111 | ||
112 | SEQ_printf(m, "\ncfs_rq\n"); | |
113 | ||
114 | SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "exec_clock", | |
115 | SPLIT_NS(cfs_rq->exec_clock)); | |
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; | |
123 | min_vruntime = rq->cfs.min_vruntime; | |
124 | rq0_min_vruntime = per_cpu(runqueues, 0).cfs.min_vruntime; | |
125 | spin_unlock_irqrestore(&rq->lock, flags); | |
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)); | |
132 | spread = max_vruntime - MIN_vruntime; | |
133 | SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "spread", | |
134 | SPLIT_NS(spread)); | |
135 | spread0 = min_vruntime - rq0_min_vruntime; | |
136 | SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "spread0", | |
137 | SPLIT_NS(spread0)); | |
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); | |
140 | #ifdef CONFIG_SCHEDSTATS | |
141 | SEQ_printf(m, " .%-30s: %d\n", "bkl_count", | |
142 | rq->bkl_count); | |
143 | #endif | |
144 | SEQ_printf(m, " .%-30s: %ld\n", "nr_spread_over", | |
145 | cfs_rq->nr_spread_over); | |
146 | } | |
147 | ||
148 | static void print_cpu(struct seq_file *m, int cpu) | |
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)) | |
165 | #define PN(x) \ | |
166 | SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rq->x)) | |
167 | ||
168 | P(nr_running); | |
169 | SEQ_printf(m, " .%-30s: %lu\n", "load", | |
170 | rq->load.weight); | |
171 | P(nr_switches); | |
172 | P(nr_load_updates); | |
173 | P(nr_uninterruptible); | |
174 | SEQ_printf(m, " .%-30s: %lu\n", "jiffies", jiffies); | |
175 | PN(next_balance); | |
176 | P(curr->pid); | |
177 | PN(clock); | |
178 | PN(idle_clock); | |
179 | PN(prev_clock_raw); | |
180 | P(clock_warps); | |
181 | P(clock_overflows); | |
182 | P(clock_deep_idle_events); | |
183 | PN(clock_max_delta); | |
184 | P(cpu_load[0]); | |
185 | P(cpu_load[1]); | |
186 | P(cpu_load[2]); | |
187 | P(cpu_load[3]); | |
188 | P(cpu_load[4]); | |
189 | #undef P | |
190 | #undef PN | |
191 | ||
192 | print_cfs_stats(m, cpu); | |
193 | ||
194 | print_rq(m, rq, cpu); | |
195 | } | |
196 | ||
197 | static int sched_debug_show(struct seq_file *m, void *v) | |
198 | { | |
199 | u64 now = ktime_to_ns(ktime_get()); | |
200 | int cpu; | |
201 | ||
202 | SEQ_printf(m, "Sched Debug Version: v0.07, %s %.*s\n", | |
203 | init_utsname()->release, | |
204 | (int)strcspn(init_utsname()->version, " "), | |
205 | init_utsname()->version); | |
206 | ||
207 | SEQ_printf(m, "now at %Lu.%06ld msecs\n", SPLIT_NS(now)); | |
208 | ||
209 | #define P(x) \ | |
210 | SEQ_printf(m, " .%-40s: %Ld\n", #x, (long long)(x)) | |
211 | #define PN(x) \ | |
212 | SEQ_printf(m, " .%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x)) | |
213 | PN(sysctl_sched_latency); | |
214 | PN(sysctl_sched_min_granularity); | |
215 | PN(sysctl_sched_wakeup_granularity); | |
216 | PN(sysctl_sched_batch_wakeup_granularity); | |
217 | PN(sysctl_sched_child_runs_first); | |
218 | P(sysctl_sched_features); | |
219 | #undef PN | |
220 | #undef P | |
221 | ||
222 | for_each_online_cpu(cpu) | |
223 | print_cpu(m, cpu); | |
224 | ||
225 | SEQ_printf(m, "\n"); | |
226 | ||
227 | return 0; | |
228 | } | |
229 | ||
230 | static void sysrq_sched_debug_show(void) | |
231 | { | |
232 | sched_debug_show(NULL, NULL); | |
233 | } | |
234 | ||
235 | static int sched_debug_open(struct inode *inode, struct file *filp) | |
236 | { | |
237 | return single_open(filp, sched_debug_show, NULL); | |
238 | } | |
239 | ||
240 | static const struct file_operations sched_debug_fops = { | |
241 | .open = sched_debug_open, | |
242 | .read = seq_read, | |
243 | .llseek = seq_lseek, | |
244 | .release = single_release, | |
245 | }; | |
246 | ||
247 | static int __init init_sched_debug_procfs(void) | |
248 | { | |
249 | struct proc_dir_entry *pe; | |
250 | ||
251 | pe = create_proc_entry("sched_debug", 0644, NULL); | |
252 | if (!pe) | |
253 | return -ENOMEM; | |
254 | ||
255 | pe->proc_fops = &sched_debug_fops; | |
256 | ||
257 | return 0; | |
258 | } | |
259 | ||
260 | __initcall(init_sched_debug_procfs); | |
261 | ||
262 | void proc_sched_show_task(struct task_struct *p, struct seq_file *m) | |
263 | { | |
264 | unsigned long nr_switches; | |
265 | unsigned long flags; | |
266 | int num_threads = 1; | |
267 | ||
268 | rcu_read_lock(); | |
269 | if (lock_task_sighand(p, &flags)) { | |
270 | num_threads = atomic_read(&p->signal->count); | |
271 | unlock_task_sighand(p, &flags); | |
272 | } | |
273 | rcu_read_unlock(); | |
274 | ||
275 | SEQ_printf(m, "%s (%d, #threads: %d)\n", p->comm, p->pid, num_threads); | |
276 | SEQ_printf(m, | |
277 | "---------------------------------------------------------\n"); | |
278 | #define __P(F) \ | |
279 | SEQ_printf(m, "%-35s:%21Ld\n", #F, (long long)F) | |
280 | #define P(F) \ | |
281 | SEQ_printf(m, "%-35s:%21Ld\n", #F, (long long)p->F) | |
282 | #define __PN(F) \ | |
283 | SEQ_printf(m, "%-35s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)F)) | |
284 | #define PN(F) \ | |
285 | SEQ_printf(m, "%-35s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)p->F)) | |
286 | ||
287 | PN(se.exec_start); | |
288 | PN(se.vruntime); | |
289 | PN(se.sum_exec_runtime); | |
290 | ||
291 | nr_switches = p->nvcsw + p->nivcsw; | |
292 | ||
293 | #ifdef CONFIG_SCHEDSTATS | |
294 | PN(se.wait_start); | |
295 | PN(se.sleep_start); | |
296 | PN(se.block_start); | |
297 | PN(se.sleep_max); | |
298 | PN(se.block_max); | |
299 | PN(se.exec_max); | |
300 | PN(se.slice_max); | |
301 | PN(se.wait_max); | |
302 | P(sched_info.bkl_count); | |
303 | P(se.nr_migrations); | |
304 | P(se.nr_migrations_cold); | |
305 | P(se.nr_failed_migrations_affine); | |
306 | P(se.nr_failed_migrations_running); | |
307 | P(se.nr_failed_migrations_hot); | |
308 | P(se.nr_forced_migrations); | |
309 | P(se.nr_forced2_migrations); | |
310 | P(se.nr_wakeups); | |
311 | P(se.nr_wakeups_sync); | |
312 | P(se.nr_wakeups_migrate); | |
313 | P(se.nr_wakeups_local); | |
314 | P(se.nr_wakeups_remote); | |
315 | P(se.nr_wakeups_affine); | |
316 | P(se.nr_wakeups_affine_attempts); | |
317 | P(se.nr_wakeups_passive); | |
318 | P(se.nr_wakeups_idle); | |
319 | ||
320 | { | |
321 | u64 avg_atom, avg_per_cpu; | |
322 | ||
323 | avg_atom = p->se.sum_exec_runtime; | |
324 | if (nr_switches) | |
325 | do_div(avg_atom, nr_switches); | |
326 | else | |
327 | avg_atom = -1LL; | |
328 | ||
329 | avg_per_cpu = p->se.sum_exec_runtime; | |
330 | if (p->se.nr_migrations) { | |
331 | avg_per_cpu = div64_64(avg_per_cpu, | |
332 | p->se.nr_migrations); | |
333 | } else { | |
334 | avg_per_cpu = -1LL; | |
335 | } | |
336 | ||
337 | __PN(avg_atom); | |
338 | __PN(avg_per_cpu); | |
339 | } | |
340 | #endif | |
341 | __P(nr_switches); | |
342 | SEQ_printf(m, "%-35s:%21Ld\n", | |
343 | "nr_voluntary_switches", (long long)p->nvcsw); | |
344 | SEQ_printf(m, "%-35s:%21Ld\n", | |
345 | "nr_involuntary_switches", (long long)p->nivcsw); | |
346 | ||
347 | P(se.load.weight); | |
348 | P(policy); | |
349 | P(prio); | |
350 | #undef PN | |
351 | #undef __PN | |
352 | #undef P | |
353 | #undef __P | |
354 | ||
355 | { | |
356 | u64 t0, t1; | |
357 | ||
358 | t0 = sched_clock(); | |
359 | t1 = sched_clock(); | |
360 | SEQ_printf(m, "%-35s:%21Ld\n", | |
361 | "clock-delta", (long long)(t1-t0)); | |
362 | } | |
363 | } | |
364 | ||
365 | void proc_sched_set_task(struct task_struct *p) | |
366 | { | |
367 | #ifdef CONFIG_SCHEDSTATS | |
368 | p->se.wait_max = 0; | |
369 | p->se.sleep_max = 0; | |
370 | p->se.sum_sleep_runtime = 0; | |
371 | p->se.block_max = 0; | |
372 | p->se.exec_max = 0; | |
373 | p->se.slice_max = 0; | |
374 | p->se.nr_migrations = 0; | |
375 | p->se.nr_migrations_cold = 0; | |
376 | p->se.nr_failed_migrations_affine = 0; | |
377 | p->se.nr_failed_migrations_running = 0; | |
378 | p->se.nr_failed_migrations_hot = 0; | |
379 | p->se.nr_forced_migrations = 0; | |
380 | p->se.nr_forced2_migrations = 0; | |
381 | p->se.nr_wakeups = 0; | |
382 | p->se.nr_wakeups_sync = 0; | |
383 | p->se.nr_wakeups_migrate = 0; | |
384 | p->se.nr_wakeups_local = 0; | |
385 | p->se.nr_wakeups_remote = 0; | |
386 | p->se.nr_wakeups_affine = 0; | |
387 | p->se.nr_wakeups_affine_attempts = 0; | |
388 | p->se.nr_wakeups_passive = 0; | |
389 | p->se.nr_wakeups_idle = 0; | |
390 | p->sched_info.bkl_count = 0; | |
391 | #endif | |
392 | p->se.sum_exec_runtime = 0; | |
393 | p->se.prev_sum_exec_runtime = 0; | |
394 | p->nvcsw = 0; | |
395 | p->nivcsw = 0; | |
396 | } |