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 %5d ",
41 (long long)p
->se
.vruntime
,
42 (long long)(p
->nvcsw
+ p
->nivcsw
),
44 #ifdef CONFIG_SCHEDSTATS
45 SEQ_printf(m
, "%15Ld %15Ld %15Ld\n",
46 (long long)p
->se
.vruntime
,
47 (long long)p
->se
.sum_exec_runtime
,
48 (long long)p
->se
.sum_sleep_runtime
);
50 SEQ_printf(m
, "%15Ld %15Ld %15Ld %15Ld %15Ld\n",
51 0LL, 0LL, 0LL, 0LL, 0LL);
55 static void print_rq(struct seq_file
*m
, struct rq
*rq
, int rq_cpu
)
57 struct task_struct
*g
, *p
;
61 " task PID tree-key switches prio"
62 " exec-runtime sum-exec sum-sleep\n"
63 "------------------------------------------------------------------"
64 "--------------------------------"
65 "------------------------------------------------"
66 "--------------------------------\n");
68 read_lock_irq(&tasklist_lock
);
70 do_each_thread(g
, p
) {
71 if (!p
->se
.on_rq
|| task_cpu(p
) != rq_cpu
)
75 } while_each_thread(g
, p
);
77 read_unlock_irq(&tasklist_lock
);
80 void print_cfs_rq(struct seq_file
*m
, int cpu
, struct cfs_rq
*cfs_rq
)
82 s64 MIN_vruntime
= -1, min_vruntime
, max_vruntime
= -1,
83 spread
, rq0_min_vruntime
, spread0
;
84 struct rq
*rq
= &per_cpu(runqueues
, cpu
);
85 struct sched_entity
*last
;
88 SEQ_printf(m
, "\ncfs_rq\n");
91 SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(cfs_rq->x))
95 spin_lock_irqsave(&rq
->lock
, flags
);
96 if (cfs_rq
->rb_leftmost
)
97 MIN_vruntime
= (__pick_next_entity(cfs_rq
))->vruntime
;
98 last
= __pick_last_entity(cfs_rq
);
100 max_vruntime
= last
->vruntime
;
101 min_vruntime
= rq
->cfs
.min_vruntime
;
102 rq0_min_vruntime
= per_cpu(runqueues
, 0).cfs
.min_vruntime
;
103 spin_unlock_irqrestore(&rq
->lock
, flags
);
104 SEQ_printf(m
, " .%-30s: %Ld\n", "MIN_vruntime",
105 (long long)MIN_vruntime
);
106 SEQ_printf(m
, " .%-30s: %Ld\n", "min_vruntime",
107 (long long)min_vruntime
);
108 SEQ_printf(m
, " .%-30s: %Ld\n", "max_vruntime",
109 (long long)max_vruntime
);
110 spread
= max_vruntime
- MIN_vruntime
;
111 SEQ_printf(m
, " .%-30s: %Ld\n", "spread",
113 spread0
= min_vruntime
- rq0_min_vruntime
;
114 SEQ_printf(m
, " .%-30s: %Ld\n", "spread0",
119 static void print_cpu(struct seq_file
*m
, int cpu
)
121 struct rq
*rq
= &per_cpu(runqueues
, cpu
);
125 unsigned int freq
= cpu_khz
? : 1;
127 SEQ_printf(m
, "\ncpu#%d, %u.%03u MHz\n",
128 cpu
, freq
/ 1000, (freq
% 1000));
131 SEQ_printf(m
, "\ncpu#%d\n", cpu
);
135 SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rq->x))
138 SEQ_printf(m
, " .%-30s: %lu\n", "load",
142 P(nr_uninterruptible
);
143 SEQ_printf(m
, " .%-30s: %lu\n", "jiffies", jiffies
);
151 P(clock_deep_idle_events
);
160 print_cfs_stats(m
, cpu
);
162 print_rq(m
, rq
, cpu
);
165 static int sched_debug_show(struct seq_file
*m
, void *v
)
167 u64 now
= ktime_to_ns(ktime_get());
170 SEQ_printf(m
, "Sched Debug Version: v0.05-v20, %s %.*s\n",
171 init_utsname()->release
,
172 (int)strcspn(init_utsname()->version
, " "),
173 init_utsname()->version
);
175 SEQ_printf(m
, "now at %Lu nsecs\n", (unsigned long long)now
);
177 for_each_online_cpu(cpu
)
185 static void sysrq_sched_debug_show(void)
187 sched_debug_show(NULL
, NULL
);
190 static int sched_debug_open(struct inode
*inode
, struct file
*filp
)
192 return single_open(filp
, sched_debug_show
, NULL
);
195 static struct file_operations sched_debug_fops
= {
196 .open
= sched_debug_open
,
199 .release
= single_release
,
202 static int __init
init_sched_debug_procfs(void)
204 struct proc_dir_entry
*pe
;
206 pe
= create_proc_entry("sched_debug", 0644, NULL
);
210 pe
->proc_fops
= &sched_debug_fops
;
215 __initcall(init_sched_debug_procfs
);
217 void proc_sched_show_task(struct task_struct
*p
, struct seq_file
*m
)
223 if (lock_task_sighand(p
, &flags
)) {
224 num_threads
= atomic_read(&p
->signal
->count
);
225 unlock_task_sighand(p
, &flags
);
229 SEQ_printf(m
, "%s (%d, #threads: %d)\n", p
->comm
, p
->pid
, num_threads
);
230 SEQ_printf(m
, "----------------------------------------------\n");
232 SEQ_printf(m, "%-25s:%20Ld\n", #F, (long long)p->F)
236 P(se
.sum_exec_runtime
);
238 #ifdef CONFIG_SCHEDSTATS
248 SEQ_printf(m
, "%-25s:%20Ld\n",
249 "nr_switches", (long long)(p
->nvcsw
+ p
->nivcsw
));
260 SEQ_printf(m
, "%-25s:%20Ld\n",
261 "clock-delta", (long long)(t1
-t0
));
265 void proc_sched_set_task(struct task_struct
*p
)
267 #ifdef CONFIG_SCHEDSTATS
274 p
->se
.sum_exec_runtime
= 0;
275 p
->se
.prev_sum_exec_runtime
= 0;