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 print_task(struct seq_file
*m
, struct rq
*rq
, struct task_struct
*p
)
39 SEQ_printf(m
, "%15s %5d %15Ld %13Ld %13Ld %9Ld %5d ",
41 (long long)p
->se
.fair_key
,
42 (long long)(p
->se
.fair_key
- rq
->cfs
.fair_clock
),
43 (long long)p
->se
.wait_runtime
,
44 (long long)(p
->nvcsw
+ p
->nivcsw
),
46 #ifdef CONFIG_SCHEDSTATS
47 SEQ_printf(m
, "%15Ld %15Ld %15Ld %15Ld %15Ld %15Ld\n",
48 (long long)p
->se
.vruntime
,
49 (long long)p
->se
.sum_exec_runtime
,
50 (long long)p
->se
.sum_wait_runtime
,
51 (long long)p
->se
.sum_sleep_runtime
,
52 (long long)p
->se
.wait_runtime_overruns
,
53 (long long)p
->se
.wait_runtime_underruns
);
55 SEQ_printf(m
, "%15Ld %15Ld %15Ld %15Ld %15Ld\n",
56 0LL, 0LL, 0LL, 0LL, 0LL);
60 static void print_rq(struct seq_file
*m
, struct rq
*rq
, int rq_cpu
)
62 struct task_struct
*g
, *p
;
66 " task PID tree-key delta waiting"
68 " exec-runtime sum-exec sum-wait sum-sleep"
69 " wait-overrun wait-underrun\n"
70 "------------------------------------------------------------------"
71 "--------------------------------"
72 "------------------------------------------------"
73 "--------------------------------\n");
75 read_lock_irq(&tasklist_lock
);
77 do_each_thread(g
, p
) {
78 if (!p
->se
.on_rq
|| task_cpu(p
) != rq_cpu
)
82 } while_each_thread(g
, p
);
84 read_unlock_irq(&tasklist_lock
);
88 print_cfs_rq_runtime_sum(struct seq_file
*m
, int cpu
, struct cfs_rq
*cfs_rq
)
90 s64 wait_runtime_rq_sum
= 0;
91 struct task_struct
*p
;
94 struct rq
*rq
= &per_cpu(runqueues
, cpu
);
96 spin_lock_irqsave(&rq
->lock
, flags
);
97 curr
= first_fair(cfs_rq
);
99 p
= rb_entry(curr
, struct task_struct
, se
.run_node
);
100 wait_runtime_rq_sum
+= p
->se
.wait_runtime
;
102 curr
= rb_next(curr
);
104 spin_unlock_irqrestore(&rq
->lock
, flags
);
106 SEQ_printf(m
, " .%-30s: %Ld\n", "wait_runtime_rq_sum",
107 (long long)wait_runtime_rq_sum
);
110 void print_cfs_rq(struct seq_file
*m
, int cpu
, struct cfs_rq
*cfs_rq
)
112 s64 MIN_vruntime
= -1, max_vruntime
= -1, spread
;
113 struct rq
*rq
= &per_cpu(runqueues
, cpu
);
114 struct sched_entity
*last
;
117 SEQ_printf(m
, "\ncfs_rq\n");
120 SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(cfs_rq->x))
126 spin_lock_irqsave(&rq
->lock
, flags
);
127 if (cfs_rq
->rb_leftmost
)
128 MIN_vruntime
= (__pick_next_entity(cfs_rq
))->vruntime
;
129 last
= __pick_last_entity(cfs_rq
);
131 max_vruntime
= last
->vruntime
;
132 spin_unlock_irqrestore(&rq
->lock
, flags
);
133 SEQ_printf(m
, " .%-30s: %Ld\n", "MIN_vruntime",
134 (long long)MIN_vruntime
);
135 SEQ_printf(m
, " .%-30s: %Ld\n", "max_vruntime",
136 (long long)max_vruntime
);
137 spread
= max_vruntime
- MIN_vruntime
;
138 SEQ_printf(m
, " .%-30s: %Ld\n", "spread",
142 P(wait_runtime_overruns
);
143 P(wait_runtime_underruns
);
147 print_cfs_rq_runtime_sum(m
, cpu
, cfs_rq
);
150 static void print_cpu(struct seq_file
*m
, int cpu
)
152 struct rq
*rq
= &per_cpu(runqueues
, cpu
);
156 unsigned int freq
= cpu_khz
? : 1;
158 SEQ_printf(m
, "\ncpu#%d, %u.%03u MHz\n",
159 cpu
, freq
/ 1000, (freq
% 1000));
162 SEQ_printf(m
, "\ncpu#%d\n", cpu
);
166 SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rq->x))
169 SEQ_printf(m
, " .%-30s: %lu\n", "load",
173 P(nr_uninterruptible
);
174 SEQ_printf(m
, " .%-30s: %lu\n", "jiffies", jiffies
);
182 P(clock_deep_idle_events
);
191 print_cfs_stats(m
, cpu
);
193 print_rq(m
, rq
, cpu
);
196 static int sched_debug_show(struct seq_file
*m
, void *v
)
198 u64 now
= ktime_to_ns(ktime_get());
201 SEQ_printf(m
, "Sched Debug Version: v0.05-v20, %s %.*s\n",
202 init_utsname()->release
,
203 (int)strcspn(init_utsname()->version
, " "),
204 init_utsname()->version
);
206 SEQ_printf(m
, "now at %Lu nsecs\n", (unsigned long long)now
);
208 for_each_online_cpu(cpu
)
216 static void sysrq_sched_debug_show(void)
218 sched_debug_show(NULL
, NULL
);
221 static int sched_debug_open(struct inode
*inode
, struct file
*filp
)
223 return single_open(filp
, sched_debug_show
, NULL
);
226 static struct file_operations sched_debug_fops
= {
227 .open
= sched_debug_open
,
230 .release
= single_release
,
233 static int __init
init_sched_debug_procfs(void)
235 struct proc_dir_entry
*pe
;
237 pe
= create_proc_entry("sched_debug", 0644, NULL
);
241 pe
->proc_fops
= &sched_debug_fops
;
246 __initcall(init_sched_debug_procfs
);
248 void proc_sched_show_task(struct task_struct
*p
, struct seq_file
*m
)
254 if (lock_task_sighand(p
, &flags
)) {
255 num_threads
= atomic_read(&p
->signal
->count
);
256 unlock_task_sighand(p
, &flags
);
260 SEQ_printf(m
, "%s (%d, #threads: %d)\n", p
->comm
, p
->pid
, num_threads
);
261 SEQ_printf(m
, "----------------------------------------------\n");
263 SEQ_printf(m, "%-25s:%20Ld\n", #F, (long long)p->F)
266 P(se
.wait_start_fair
);
268 P(se
.sleep_start_fair
);
270 P(se
.sum_exec_runtime
);
272 #ifdef CONFIG_SCHEDSTATS
281 P(se
.wait_runtime_overruns
);
282 P(se
.wait_runtime_underruns
);
283 P(se
.sum_wait_runtime
);
285 SEQ_printf(m
, "%-25s:%20Ld\n",
286 "nr_switches", (long long)(p
->nvcsw
+ p
->nivcsw
));
297 SEQ_printf(m
, "%-25s:%20Ld\n",
298 "clock-delta", (long long)(t1
-t0
));
302 void proc_sched_set_task(struct task_struct
*p
)
304 #ifdef CONFIG_SCHEDSTATS
310 p
->se
.wait_runtime_overruns
= 0;
311 p
->se
.wait_runtime_underruns
= 0;
313 p
->se
.sum_exec_runtime
= 0;
314 p
->se
.prev_sum_exec_runtime
= 0;