2 * kernel/time/sched_debug.c
6 * Copyright(C) 2007, Red Hat, Inc., Ingo Molnar
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.
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>
20 * This allows printing both to /proc/sched_debug and
23 #define SEQ_printf(m, x...) \
32 * Ease the printing of nsec fields:
34 static long long nsec_high(unsigned long long nsec)
36 if ((long long)nsec < 0) {
38 do_div(nsec, 1000000);
41 do_div(nsec, 1000000);
46 static unsigned long nsec_low(unsigned long long nsec)
48 if ((long long)nsec < 0)
51 return do_div(nsec, 1000000);
54 #define SPLIT_NS(x) nsec_high(x), nsec_low(x)
56 #ifdef CONFIG_FAIR_GROUP_SCHED
57 static void print_cfs_group_stats(struct seq_file *m, int cpu, struct task_group *tg)
59 struct sched_entity *se = tg->se[cpu];
64 SEQ_printf(m, " .%-30s: %lld\n", #F, (long long)F)
66 SEQ_printf(m, " .%-30s: %lld.%06ld\n", #F, SPLIT_NS((long long)F))
70 PN(se->sum_exec_runtime);
71 #ifdef CONFIG_SCHEDSTATS
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);
90 print_task(struct seq_file *m, struct rq *rq, struct task_struct *p)
97 SEQ_printf(m, "%15s %5d %9Ld.%06ld %9Ld %5d ",
99 SPLIT_NS(p->se.vruntime),
100 (long long)(p->nvcsw + p->nivcsw),
102 #ifdef CONFIG_SCHEDSTATS
103 SEQ_printf(m, "%9Ld.%06ld %9Ld.%06ld %9Ld.%06ld",
104 SPLIT_NS(p->se.vruntime),
105 SPLIT_NS(p->se.sum_exec_runtime),
106 SPLIT_NS(p->se.statistics.sum_sleep_runtime));
108 SEQ_printf(m, "%15Ld %15Ld %15Ld.%06ld %15Ld.%06ld %15Ld.%06ld",
109 0LL, 0LL, 0LL, 0L, 0LL, 0L, 0LL, 0L);
115 static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu)
117 struct task_struct *g, *p;
121 "\nrunnable tasks:\n"
122 " task PID tree-key switches prio"
123 " exec-runtime sum-exec sum-sleep\n"
124 "------------------------------------------------------"
125 "----------------------------------------------------\n");
127 read_lock_irqsave(&tasklist_lock, flags);
129 do_each_thread(g, p) {
130 if (!p->se.on_rq || task_cpu(p) != rq_cpu)
133 print_task(m, rq, p);
134 } while_each_thread(g, p);
136 read_unlock_irqrestore(&tasklist_lock, flags);
139 void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
141 s64 MIN_vruntime = -1, min_vruntime, max_vruntime = -1,
142 spread, rq0_min_vruntime, spread0;
143 struct rq *rq = cpu_rq(cpu);
144 struct sched_entity *last;
147 SEQ_printf(m, "\ncfs_rq[%d]:\n", cpu);
148 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "exec_clock",
149 SPLIT_NS(cfs_rq->exec_clock));
151 raw_spin_lock_irqsave(&rq->lock, flags);
152 if (cfs_rq->rb_leftmost)
153 MIN_vruntime = (__pick_next_entity(cfs_rq))->vruntime;
154 last = __pick_last_entity(cfs_rq);
156 max_vruntime = last->vruntime;
157 min_vruntime = cfs_rq->min_vruntime;
158 rq0_min_vruntime = cpu_rq(0)->cfs.min_vruntime;
159 raw_spin_unlock_irqrestore(&rq->lock, flags);
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));
166 spread = max_vruntime - MIN_vruntime;
167 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "spread",
169 spread0 = min_vruntime - rq0_min_vruntime;
170 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "spread0",
172 SEQ_printf(m, " .%-30s: %d\n", "nr_spread_over",
173 cfs_rq->nr_spread_over);
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);
176 #ifdef CONFIG_FAIR_GROUP_SCHED
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",
185 atomic_read(&cfs_rq->tg->load_weight));
188 print_cfs_group_stats(m, cpu, cfs_rq->tg);
192 void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq)
194 SEQ_printf(m, "\nrt_rq[%d]:\n", cpu);
197 SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rt_rq->x))
199 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rt_rq->x))
210 extern __read_mostly int sched_clock_running;
212 static void print_cpu(struct seq_file *m, int cpu)
214 struct rq *rq = cpu_rq(cpu);
218 unsigned int freq = cpu_khz ? : 1;
220 SEQ_printf(m, "\ncpu#%d, %u.%03u MHz\n",
221 cpu, freq / 1000, (freq % 1000));
224 SEQ_printf(m, "\ncpu#%d\n", cpu);
228 SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rq->x))
230 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rq->x))
233 SEQ_printf(m, " .%-30s: %lu\n", "load",
237 P(nr_uninterruptible);
249 #ifdef CONFIG_SCHEDSTATS
250 #define P(n) SEQ_printf(m, " .%-30s: %d\n", #n, rq->n);
251 #define P64(n) SEQ_printf(m, " .%-30s: %Ld\n", #n, rq->n);
269 print_cfs_stats(m, cpu);
270 print_rt_stats(m, cpu);
272 print_rq(m, rq, cpu);
275 static const char *sched_tunable_scaling_names[] = {
281 static int sched_debug_show(struct seq_file *m, void *v)
283 u64 ktime, sched_clk, cpu_clk;
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);
293 SEQ_printf(m, "Sched Debug Version: v0.10, %s %.*s\n",
294 init_utsname()->release,
295 (int)strcspn(init_utsname()->version, " "),
296 init_utsname()->version);
299 SEQ_printf(m, "%-40s: %Ld\n", #x, (long long)(x))
301 SEQ_printf(m, "%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x))
306 #ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
307 P(sched_clock_stable);
313 SEQ_printf(m, "sysctl_sched\n");
316 SEQ_printf(m, " .%-40s: %Ld\n", #x, (long long)(x))
318 SEQ_printf(m, " .%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x))
319 PN(sysctl_sched_latency);
320 PN(sysctl_sched_min_granularity);
321 PN(sysctl_sched_wakeup_granularity);
322 P(sysctl_sched_child_runs_first);
323 P(sysctl_sched_features);
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]);
331 for_each_online_cpu(cpu)
339 static void sysrq_sched_debug_show(void)
341 sched_debug_show(NULL, NULL);
344 static int sched_debug_open(struct inode *inode, struct file *filp)
346 return single_open(filp, sched_debug_show, NULL);
349 static const struct file_operations sched_debug_fops = {
350 .open = sched_debug_open,
353 .release = single_release,
356 static int __init init_sched_debug_procfs(void)
358 struct proc_dir_entry *pe;
360 pe = proc_create("sched_debug", 0444, NULL, &sched_debug_fops);
366 __initcall(init_sched_debug_procfs);
368 void proc_sched_show_task(struct task_struct *p, struct seq_file *m)
370 unsigned long nr_switches;
372 SEQ_printf(m, "%s (%d, #threads: %d)\n", p->comm, p->pid,
375 "---------------------------------------------------------\n");
377 SEQ_printf(m, "%-35s:%21Ld\n", #F, (long long)F)
379 SEQ_printf(m, "%-35s:%21Ld\n", #F, (long long)p->F)
381 SEQ_printf(m, "%-35s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)F))
383 SEQ_printf(m, "%-35s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)p->F))
387 PN(se.sum_exec_runtime);
389 nr_switches = p->nvcsw + p->nivcsw;
391 #ifdef CONFIG_SCHEDSTATS
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);
404 P(sched_info.bkl_count);
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);
422 u64 avg_atom, avg_per_cpu;
424 avg_atom = p->se.sum_exec_runtime;
426 do_div(avg_atom, nr_switches);
430 avg_per_cpu = p->se.sum_exec_runtime;
431 if (p->se.nr_migrations) {
432 avg_per_cpu = div64_u64(avg_per_cpu,
433 p->se.nr_migrations);
443 SEQ_printf(m, "%-35s:%21Ld\n",
444 "nr_voluntary_switches", (long long)p->nvcsw);
445 SEQ_printf(m, "%-35s:%21Ld\n",
446 "nr_involuntary_switches", (long long)p->nivcsw);
457 unsigned int this_cpu = raw_smp_processor_id();
460 t0 = cpu_clock(this_cpu);
461 t1 = cpu_clock(this_cpu);
462 SEQ_printf(m, "%-35s:%21Ld\n",
463 "clock-delta", (long long)(t1-t0));
467 void proc_sched_set_task(struct task_struct *p)
469 #ifdef CONFIG_SCHEDSTATS
470 memset(&p->se.statistics, 0, sizeof(p->se.statistics));