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\n",
48 (long long)p
->se
.sum_exec_runtime
,
49 (long long)p
->se
.sum_wait_runtime
,
50 (long long)p
->se
.sum_sleep_runtime
,
51 (long long)p
->se
.wait_runtime_overruns
,
52 (long long)p
->se
.wait_runtime_underruns
);
54 SEQ_printf(m
, "%15Ld %15Ld %15Ld %15Ld %15Ld\n",
55 0LL, 0LL, 0LL, 0LL, 0LL);
59 static void print_rq(struct seq_file
*m
, struct rq
*rq
, int rq_cpu
)
61 struct task_struct
*g
, *p
;
65 " task PID tree-key delta waiting"
67 " sum-exec sum-wait sum-sleep"
68 " wait-overrun wait-underrun\n"
69 "------------------------------------------------------------------"
71 "------------------------------------------------"
72 "--------------------------------\n");
74 read_lock_irq(&tasklist_lock
);
76 do_each_thread(g
, p
) {
77 if (!p
->se
.on_rq
|| task_cpu(p
) != rq_cpu
)
81 } while_each_thread(g
, p
);
83 read_unlock_irq(&tasklist_lock
);
87 print_cfs_rq_runtime_sum(struct seq_file
*m
, int cpu
, struct cfs_rq
*cfs_rq
)
89 s64 wait_runtime_rq_sum
= 0;
90 struct task_struct
*p
;
93 struct rq
*rq
= &per_cpu(runqueues
, cpu
);
95 spin_lock_irqsave(&rq
->lock
, flags
);
96 curr
= first_fair(cfs_rq
);
98 p
= rb_entry(curr
, struct task_struct
, se
.run_node
);
99 wait_runtime_rq_sum
+= p
->se
.wait_runtime
;
101 curr
= rb_next(curr
);
103 spin_unlock_irqrestore(&rq
->lock
, flags
);
105 SEQ_printf(m
, " .%-30s: %Ld\n", "wait_runtime_rq_sum",
106 (long long)wait_runtime_rq_sum
);
109 void print_cfs_rq(struct seq_file
*m
, int cpu
, struct cfs_rq
*cfs_rq
)
111 SEQ_printf(m
, "\ncfs_rq\n");
114 SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(cfs_rq->x))
119 P(wait_runtime_overruns
);
120 P(wait_runtime_underruns
);
124 print_cfs_rq_runtime_sum(m
, cpu
, cfs_rq
);
127 static void print_cpu(struct seq_file
*m
, int cpu
)
129 struct rq
*rq
= &per_cpu(runqueues
, cpu
);
133 unsigned int freq
= cpu_khz
? : 1;
135 SEQ_printf(m
, "\ncpu#%d, %u.%03u MHz\n",
136 cpu
, freq
/ 1000, (freq
% 1000));
139 SEQ_printf(m
, "\ncpu#%d\n", cpu
);
143 SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rq->x))
146 SEQ_printf(m
, " .%-30s: %lu\n", "load",
150 P(nr_uninterruptible
);
151 SEQ_printf(m
, " .%-30s: %lu\n", "jiffies", jiffies
);
159 P(clock_deep_idle_events
);
168 print_cfs_stats(m
, cpu
);
170 print_rq(m
, rq
, cpu
);
173 static int sched_debug_show(struct seq_file
*m
, void *v
)
175 u64 now
= ktime_to_ns(ktime_get());
178 SEQ_printf(m
, "Sched Debug Version: v0.05-v20, %s %.*s\n",
179 init_utsname()->release
,
180 (int)strcspn(init_utsname()->version
, " "),
181 init_utsname()->version
);
183 SEQ_printf(m
, "now at %Lu nsecs\n", (unsigned long long)now
);
185 for_each_online_cpu(cpu
)
193 static void sysrq_sched_debug_show(void)
195 sched_debug_show(NULL
, NULL
);
198 static int sched_debug_open(struct inode
*inode
, struct file
*filp
)
200 return single_open(filp
, sched_debug_show
, NULL
);
203 static struct file_operations sched_debug_fops
= {
204 .open
= sched_debug_open
,
207 .release
= single_release
,
210 static int __init
init_sched_debug_procfs(void)
212 struct proc_dir_entry
*pe
;
214 pe
= create_proc_entry("sched_debug", 0644, NULL
);
218 pe
->proc_fops
= &sched_debug_fops
;
223 __initcall(init_sched_debug_procfs
);
225 void proc_sched_show_task(struct task_struct
*p
, struct seq_file
*m
)
231 if (lock_task_sighand(p
, &flags
)) {
232 num_threads
= atomic_read(&p
->signal
->count
);
233 unlock_task_sighand(p
, &flags
);
237 SEQ_printf(m
, "%s (%d, #threads: %d)\n", p
->comm
, p
->pid
, num_threads
);
238 SEQ_printf(m
, "----------------------------------------------\n");
240 SEQ_printf(m, "%-25s:%20Ld\n", #F, (long long)p->F)
243 P(se
.wait_start_fair
);
245 P(se
.sleep_start_fair
);
246 P(se
.sum_exec_runtime
);
248 #ifdef CONFIG_SCHEDSTATS
257 P(se
.wait_runtime_overruns
);
258 P(se
.wait_runtime_underruns
);
259 P(se
.sum_wait_runtime
);
261 SEQ_printf(m
, "%-25s:%20Ld\n",
262 "nr_switches", (long long)(p
->nvcsw
+ p
->nivcsw
));
273 SEQ_printf(m
, "%-25s:%20Ld\n",
274 "clock-delta", (long long)(t1
-t0
));
278 void proc_sched_set_task(struct task_struct
*p
)
280 #ifdef CONFIG_SCHEDSTATS
286 p
->se
.wait_runtime_overruns
= 0;
287 p
->se
.wait_runtime_underruns
= 0;
289 p
->se
.sum_exec_runtime
= 0;
290 p
->se
.prev_sum_exec_runtime
= 0;