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
,
58 struct task_group
*tg
)
60 struct sched_entity
*se
= tg
->se
[cpu
];
65 SEQ_printf(m, " .%-30s: %lld\n", #F, (long long)F)
67 SEQ_printf(m, " .%-30s: %lld.%06ld\n", #F, SPLIT_NS((long long)F))
71 PN(se
->sum_exec_runtime
);
72 #ifdef CONFIG_SCHEDSTATS
73 PN(se
->statistics
.wait_start
);
74 PN(se
->statistics
.sleep_start
);
75 PN(se
->statistics
.block_start
);
76 PN(se
->statistics
.sleep_max
);
77 PN(se
->statistics
.block_max
);
78 PN(se
->statistics
.exec_max
);
79 PN(se
->statistics
.slice_max
);
80 PN(se
->statistics
.wait_max
);
81 PN(se
->statistics
.wait_sum
);
82 P(se
->statistics
.wait_count
);
91 print_task(struct seq_file
*m
, struct rq
*rq
, struct task_struct
*p
)
98 SEQ_printf(m
, "%15s %5d %9Ld.%06ld %9Ld %5d ",
100 SPLIT_NS(p
->se
.vruntime
),
101 (long long)(p
->nvcsw
+ p
->nivcsw
),
103 #ifdef CONFIG_SCHEDSTATS
104 SEQ_printf(m
, "%9Ld.%06ld %9Ld.%06ld %9Ld.%06ld",
105 SPLIT_NS(p
->se
.vruntime
),
106 SPLIT_NS(p
->se
.sum_exec_runtime
),
107 SPLIT_NS(p
->se
.statistics
.sum_sleep_runtime
));
109 SEQ_printf(m
, "%15Ld %15Ld %15Ld.%06ld %15Ld.%06ld %15Ld.%06ld",
110 0LL, 0LL, 0LL, 0L, 0LL, 0L, 0LL, 0L);
113 #ifdef CONFIG_CGROUP_SCHED
118 cgroup_path(task_group(p
)->css
.cgroup
, path
, sizeof(path
));
120 SEQ_printf(m
, " %s", path
);
126 static void print_rq(struct seq_file
*m
, struct rq
*rq
, int rq_cpu
)
128 struct task_struct
*g
, *p
;
132 "\nrunnable tasks:\n"
133 " task PID tree-key switches prio"
134 " exec-runtime sum-exec sum-sleep\n"
135 "------------------------------------------------------"
136 "----------------------------------------------------\n");
138 read_lock_irqsave(&tasklist_lock
, flags
);
140 do_each_thread(g
, p
) {
141 if (!p
->se
.on_rq
|| task_cpu(p
) != rq_cpu
)
144 print_task(m
, rq
, p
);
145 } while_each_thread(g
, p
);
147 read_unlock_irqrestore(&tasklist_lock
, flags
);
150 #if defined(CONFIG_CGROUP_SCHED) && \
151 (defined(CONFIG_FAIR_GROUP_SCHED) || defined(CONFIG_RT_GROUP_SCHED))
152 static void task_group_path(struct task_group
*tg
, char *buf
, int buflen
)
154 /* may be NULL if the underlying cgroup isn't fully-created yet */
155 if (!tg
->css
.cgroup
) {
159 cgroup_path(tg
->css
.cgroup
, buf
, buflen
);
163 void print_cfs_rq(struct seq_file
*m
, int cpu
, struct cfs_rq
*cfs_rq
)
165 s64 MIN_vruntime
= -1, min_vruntime
, max_vruntime
= -1,
166 spread
, rq0_min_vruntime
, spread0
;
167 struct rq
*rq
= cpu_rq(cpu
);
168 struct sched_entity
*last
;
171 #if defined(CONFIG_CGROUP_SCHED) && defined(CONFIG_FAIR_GROUP_SCHED)
173 struct task_group
*tg
= cfs_rq
->tg
;
175 task_group_path(tg
, path
, sizeof(path
));
177 SEQ_printf(m
, "\ncfs_rq[%d]:%s\n", cpu
, path
);
179 SEQ_printf(m
, "\ncfs_rq[%d]:\n", cpu
);
181 SEQ_printf(m
, " .%-30s: %Ld.%06ld\n", "exec_clock",
182 SPLIT_NS(cfs_rq
->exec_clock
));
184 raw_spin_lock_irqsave(&rq
->lock
, flags
);
185 if (cfs_rq
->rb_leftmost
)
186 MIN_vruntime
= (__pick_next_entity(cfs_rq
))->vruntime
;
187 last
= __pick_last_entity(cfs_rq
);
189 max_vruntime
= last
->vruntime
;
190 min_vruntime
= cfs_rq
->min_vruntime
;
191 rq0_min_vruntime
= cpu_rq(0)->cfs
.min_vruntime
;
192 raw_spin_unlock_irqrestore(&rq
->lock
, flags
);
193 SEQ_printf(m
, " .%-30s: %Ld.%06ld\n", "MIN_vruntime",
194 SPLIT_NS(MIN_vruntime
));
195 SEQ_printf(m
, " .%-30s: %Ld.%06ld\n", "min_vruntime",
196 SPLIT_NS(min_vruntime
));
197 SEQ_printf(m
, " .%-30s: %Ld.%06ld\n", "max_vruntime",
198 SPLIT_NS(max_vruntime
));
199 spread
= max_vruntime
- MIN_vruntime
;
200 SEQ_printf(m
, " .%-30s: %Ld.%06ld\n", "spread",
202 spread0
= min_vruntime
- rq0_min_vruntime
;
203 SEQ_printf(m
, " .%-30s: %Ld.%06ld\n", "spread0",
205 SEQ_printf(m
, " .%-30s: %d\n", "nr_spread_over",
206 cfs_rq
->nr_spread_over
);
207 SEQ_printf(m
, " .%-30s: %ld\n", "nr_running", cfs_rq
->nr_running
);
208 SEQ_printf(m
, " .%-30s: %ld\n", "load", cfs_rq
->load
.weight
);
209 #ifdef CONFIG_FAIR_GROUP_SCHED
211 SEQ_printf(m
, " .%-30s: %Ld.%06ld\n", "load_avg",
212 SPLIT_NS(cfs_rq
->load_avg
));
213 SEQ_printf(m
, " .%-30s: %Ld.%06ld\n", "load_period",
214 SPLIT_NS(cfs_rq
->load_period
));
215 SEQ_printf(m
, " .%-30s: %ld\n", "load_contrib",
216 cfs_rq
->load_contribution
);
217 SEQ_printf(m
, " .%-30s: %d\n", "load_tg",
218 atomic_read(&tg
->load_weight
));
221 print_cfs_group_stats(m
, cpu
, cfs_rq
->tg
);
225 void print_rt_rq(struct seq_file
*m
, int cpu
, struct rt_rq
*rt_rq
)
227 #if defined(CONFIG_CGROUP_SCHED) && defined(CONFIG_RT_GROUP_SCHED)
229 struct task_group
*tg
= rt_rq
->tg
;
231 task_group_path(tg
, path
, sizeof(path
));
233 SEQ_printf(m
, "\nrt_rq[%d]:%s\n", cpu
, path
);
235 SEQ_printf(m
, "\nrt_rq[%d]:\n", cpu
);
240 SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rt_rq->x))
242 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rt_rq->x))
253 extern __read_mostly
int sched_clock_running
;
255 static void print_cpu(struct seq_file
*m
, int cpu
)
257 struct rq
*rq
= cpu_rq(cpu
);
261 unsigned int freq
= cpu_khz
? : 1;
263 SEQ_printf(m
, "\ncpu#%d, %u.%03u MHz\n",
264 cpu
, freq
/ 1000, (freq
% 1000));
267 SEQ_printf(m
, "\ncpu#%d\n", cpu
);
271 SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rq->x))
273 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rq->x))
276 SEQ_printf(m
, " .%-30s: %lu\n", "load",
280 P(nr_uninterruptible
);
292 #ifdef CONFIG_SCHEDSTATS
293 #define P(n) SEQ_printf(m, " .%-30s: %d\n", #n, rq->n);
294 #define P64(n) SEQ_printf(m, " .%-30s: %Ld\n", #n, rq->n);
312 print_cfs_stats(m
, cpu
);
313 print_rt_stats(m
, cpu
);
315 print_rq(m
, rq
, cpu
);
318 static const char *sched_tunable_scaling_names
[] = {
324 static int sched_debug_show(struct seq_file
*m
, void *v
)
326 u64 ktime
, sched_clk
, cpu_clk
;
330 local_irq_save(flags
);
331 ktime
= ktime_to_ns(ktime_get());
332 sched_clk
= sched_clock();
333 cpu_clk
= local_clock();
334 local_irq_restore(flags
);
336 SEQ_printf(m
, "Sched Debug Version: v0.10, %s %.*s\n",
337 init_utsname()->release
,
338 (int)strcspn(init_utsname()->version
, " "),
339 init_utsname()->version
);
342 SEQ_printf(m, "%-40s: %Ld\n", #x, (long long)(x))
344 SEQ_printf(m, "%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x))
349 #ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
350 P(sched_clock_stable
);
356 SEQ_printf(m
, "sysctl_sched\n");
359 SEQ_printf(m, " .%-40s: %Ld\n", #x, (long long)(x))
361 SEQ_printf(m, " .%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x))
362 PN(sysctl_sched_latency
);
363 PN(sysctl_sched_min_granularity
);
364 PN(sysctl_sched_wakeup_granularity
);
365 P(sysctl_sched_child_runs_first
);
366 P(sysctl_sched_features
);
370 SEQ_printf(m
, " .%-40s: %d (%s)\n", "sysctl_sched_tunable_scaling",
371 sysctl_sched_tunable_scaling
,
372 sched_tunable_scaling_names
[sysctl_sched_tunable_scaling
]);
374 for_each_online_cpu(cpu
)
382 static void sysrq_sched_debug_show(void)
384 sched_debug_show(NULL
, NULL
);
387 static int sched_debug_open(struct inode
*inode
, struct file
*filp
)
389 return single_open(filp
, sched_debug_show
, NULL
);
392 static const struct file_operations sched_debug_fops
= {
393 .open
= sched_debug_open
,
396 .release
= single_release
,
399 static int __init
init_sched_debug_procfs(void)
401 struct proc_dir_entry
*pe
;
403 pe
= proc_create("sched_debug", 0444, NULL
, &sched_debug_fops
);
409 __initcall(init_sched_debug_procfs
);
411 void proc_sched_show_task(struct task_struct
*p
, struct seq_file
*m
)
413 unsigned long nr_switches
;
415 SEQ_printf(m
, "%s (%d, #threads: %d)\n", p
->comm
, p
->pid
,
418 "---------------------------------------------------------\n");
420 SEQ_printf(m, "%-35s:%21Ld\n", #F, (long long)F)
422 SEQ_printf(m, "%-35s:%21Ld\n", #F, (long long)p->F)
424 SEQ_printf(m, "%-35s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)F))
426 SEQ_printf(m, "%-35s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)p->F))
430 PN(se
.sum_exec_runtime
);
432 nr_switches
= p
->nvcsw
+ p
->nivcsw
;
434 #ifdef CONFIG_SCHEDSTATS
435 PN(se
.statistics
.wait_start
);
436 PN(se
.statistics
.sleep_start
);
437 PN(se
.statistics
.block_start
);
438 PN(se
.statistics
.sleep_max
);
439 PN(se
.statistics
.block_max
);
440 PN(se
.statistics
.exec_max
);
441 PN(se
.statistics
.slice_max
);
442 PN(se
.statistics
.wait_max
);
443 PN(se
.statistics
.wait_sum
);
444 P(se
.statistics
.wait_count
);
445 PN(se
.statistics
.iowait_sum
);
446 P(se
.statistics
.iowait_count
);
447 P(sched_info
.bkl_count
);
449 P(se
.statistics
.nr_migrations_cold
);
450 P(se
.statistics
.nr_failed_migrations_affine
);
451 P(se
.statistics
.nr_failed_migrations_running
);
452 P(se
.statistics
.nr_failed_migrations_hot
);
453 P(se
.statistics
.nr_forced_migrations
);
454 P(se
.statistics
.nr_wakeups
);
455 P(se
.statistics
.nr_wakeups_sync
);
456 P(se
.statistics
.nr_wakeups_migrate
);
457 P(se
.statistics
.nr_wakeups_local
);
458 P(se
.statistics
.nr_wakeups_remote
);
459 P(se
.statistics
.nr_wakeups_affine
);
460 P(se
.statistics
.nr_wakeups_affine_attempts
);
461 P(se
.statistics
.nr_wakeups_passive
);
462 P(se
.statistics
.nr_wakeups_idle
);
465 u64 avg_atom
, avg_per_cpu
;
467 avg_atom
= p
->se
.sum_exec_runtime
;
469 do_div(avg_atom
, nr_switches
);
473 avg_per_cpu
= p
->se
.sum_exec_runtime
;
474 if (p
->se
.nr_migrations
) {
475 avg_per_cpu
= div64_u64(avg_per_cpu
,
476 p
->se
.nr_migrations
);
486 SEQ_printf(m
, "%-35s:%21Ld\n",
487 "nr_voluntary_switches", (long long)p
->nvcsw
);
488 SEQ_printf(m
, "%-35s:%21Ld\n",
489 "nr_involuntary_switches", (long long)p
->nivcsw
);
500 unsigned int this_cpu
= raw_smp_processor_id();
503 t0
= cpu_clock(this_cpu
);
504 t1
= cpu_clock(this_cpu
);
505 SEQ_printf(m
, "%-35s:%21Ld\n",
506 "clock-delta", (long long)(t1
-t0
));
510 void proc_sched_set_task(struct task_struct
*p
)
512 #ifdef CONFIG_SCHEDSTATS
513 memset(&p
->se
.statistics
, 0, sizeof(p
->se
.statistics
));