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(long long nsec
)
38 do_div(nsec
, 1000000);
41 do_div(nsec
, 1000000);
46 static unsigned long nsec_low(long long nsec
)
51 return do_div(nsec
, 1000000);
54 #define SPLIT_NS(x) nsec_high(x), nsec_low(x)
57 print_task(struct seq_file
*m
, struct rq
*rq
, struct task_struct
*p
)
64 SEQ_printf(m
, "%15s %5d %9Ld.%06ld %9Ld %5d ",
66 SPLIT_NS(p
->se
.vruntime
),
67 (long long)(p
->nvcsw
+ p
->nivcsw
),
69 #ifdef CONFIG_SCHEDSTATS
70 SEQ_printf(m
, "%9Ld.%06ld %9Ld.%06ld %9Ld.%06ld\n",
71 SPLIT_NS(p
->se
.vruntime
),
72 SPLIT_NS(p
->se
.sum_exec_runtime
),
73 SPLIT_NS(p
->se
.sum_sleep_runtime
));
75 SEQ_printf(m
, "%15Ld %15Ld %15Ld.%06ld %15Ld.%06ld %15Ld.%06ld\n",
76 0LL, 0LL, 0LL, 0L, 0LL, 0L, 0LL, 0L);
80 static void print_rq(struct seq_file
*m
, struct rq
*rq
, int rq_cpu
)
82 struct task_struct
*g
, *p
;
86 " task PID tree-key switches prio"
87 " exec-runtime sum-exec sum-sleep\n"
88 "------------------------------------------------------"
89 "----------------------------------------------------\n");
91 read_lock_irq(&tasklist_lock
);
93 do_each_thread(g
, p
) {
94 if (!p
->se
.on_rq
|| task_cpu(p
) != rq_cpu
)
98 } while_each_thread(g
, p
);
100 read_unlock_irq(&tasklist_lock
);
103 void print_cfs_rq(struct seq_file
*m
, int cpu
, struct cfs_rq
*cfs_rq
)
105 s64 MIN_vruntime
= -1, min_vruntime
, max_vruntime
= -1,
106 spread
, rq0_min_vruntime
, spread0
;
107 struct rq
*rq
= &per_cpu(runqueues
, cpu
);
108 struct sched_entity
*last
;
111 SEQ_printf(m
, "\ncfs_rq\n");
113 SEQ_printf(m
, " .%-30s: %Ld.%06ld\n", "exec_clock",
114 SPLIT_NS(cfs_rq
->exec_clock
));
116 spin_lock_irqsave(&rq
->lock
, flags
);
117 if (cfs_rq
->rb_leftmost
)
118 MIN_vruntime
= (__pick_next_entity(cfs_rq
))->vruntime
;
119 last
= __pick_last_entity(cfs_rq
);
121 max_vruntime
= last
->vruntime
;
122 min_vruntime
= rq
->cfs
.min_vruntime
;
123 rq0_min_vruntime
= per_cpu(runqueues
, 0).cfs
.min_vruntime
;
124 spin_unlock_irqrestore(&rq
->lock
, flags
);
125 SEQ_printf(m
, " .%-30s: %Ld.%06ld\n", "MIN_vruntime",
126 SPLIT_NS(MIN_vruntime
));
127 SEQ_printf(m
, " .%-30s: %Ld.%06ld\n", "min_vruntime",
128 SPLIT_NS(min_vruntime
));
129 SEQ_printf(m
, " .%-30s: %Ld.%06ld\n", "max_vruntime",
130 SPLIT_NS(max_vruntime
));
131 spread
= max_vruntime
- MIN_vruntime
;
132 SEQ_printf(m
, " .%-30s: %Ld.%06ld\n", "spread",
134 spread0
= min_vruntime
- rq0_min_vruntime
;
135 SEQ_printf(m
, " .%-30s: %Ld.%06ld\n", "spread0",
137 SEQ_printf(m
, " .%-30s: %ld\n", "nr_running", cfs_rq
->nr_running
);
138 SEQ_printf(m
, " .%-30s: %ld\n", "load", cfs_rq
->load
.weight
);
141 static void print_cpu(struct seq_file
*m
, int cpu
)
143 struct rq
*rq
= &per_cpu(runqueues
, cpu
);
147 unsigned int freq
= cpu_khz
? : 1;
149 SEQ_printf(m
, "\ncpu#%d, %u.%03u MHz\n",
150 cpu
, freq
/ 1000, (freq
% 1000));
153 SEQ_printf(m
, "\ncpu#%d\n", cpu
);
157 SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rq->x))
159 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rq->x))
162 SEQ_printf(m
, " .%-30s: %lu\n", "load",
166 P(nr_uninterruptible
);
167 SEQ_printf(m
, " .%-30s: %lu\n", "jiffies", jiffies
);
175 P(clock_deep_idle_events
);
185 print_cfs_stats(m
, cpu
);
187 print_rq(m
, rq
, cpu
);
190 static int sched_debug_show(struct seq_file
*m
, void *v
)
192 u64 now
= ktime_to_ns(ktime_get());
195 SEQ_printf(m
, "Sched Debug Version: v0.05-v20, %s %.*s\n",
196 init_utsname()->release
,
197 (int)strcspn(init_utsname()->version
, " "),
198 init_utsname()->version
);
200 SEQ_printf(m
, "now at %Lu.%06ld msecs\n", SPLIT_NS(now
));
202 for_each_online_cpu(cpu
)
210 static void sysrq_sched_debug_show(void)
212 sched_debug_show(NULL
, NULL
);
215 #ifdef CONFIG_FAIR_USER_SCHED
217 static DEFINE_MUTEX(root_user_share_mutex
);
220 root_user_share_read_proc(char *page
, char **start
, off_t off
, int count
,
221 int *eof
, void *data
)
225 len
= sprintf(page
, "%d\n", init_task_grp_load
);
231 root_user_share_write_proc(struct file
*file
, const char __user
*buffer
,
232 unsigned long count
, void *data
)
234 unsigned long shares
;
235 char kbuf
[sizeof(unsigned long)+1];
238 if (copy_from_user(kbuf
, buffer
, sizeof(kbuf
)))
241 shares
= simple_strtoul(kbuf
, NULL
, 0);
244 shares
= NICE_0_LOAD
;
246 mutex_lock(&root_user_share_mutex
);
248 init_task_grp_load
= shares
;
249 rc
= sched_group_set_shares(&init_task_grp
, shares
);
251 mutex_unlock(&root_user_share_mutex
);
253 return (rc
< 0 ? rc
: count
);
256 #endif /* CONFIG_FAIR_USER_SCHED */
258 static int sched_debug_open(struct inode
*inode
, struct file
*filp
)
260 return single_open(filp
, sched_debug_show
, NULL
);
263 static struct file_operations sched_debug_fops
= {
264 .open
= sched_debug_open
,
267 .release
= single_release
,
270 static int __init
init_sched_debug_procfs(void)
272 struct proc_dir_entry
*pe
;
274 pe
= create_proc_entry("sched_debug", 0644, NULL
);
278 pe
->proc_fops
= &sched_debug_fops
;
280 #ifdef CONFIG_FAIR_USER_SCHED
281 pe
= create_proc_entry("root_user_share", 0644, NULL
);
285 pe
->read_proc
= root_user_share_read_proc
;
286 pe
->write_proc
= root_user_share_write_proc
;
292 __initcall(init_sched_debug_procfs
);
294 void proc_sched_show_task(struct task_struct
*p
, struct seq_file
*m
)
300 if (lock_task_sighand(p
, &flags
)) {
301 num_threads
= atomic_read(&p
->signal
->count
);
302 unlock_task_sighand(p
, &flags
);
306 SEQ_printf(m
, "%s (%d, #threads: %d)\n", p
->comm
, p
->pid
, num_threads
);
307 SEQ_printf(m
, "----------------------------------------------\n");
309 SEQ_printf(m, "%-25s:%20Ld\n", #F, (long long)p->F)
311 SEQ_printf(m, "%-25s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)p->F))
315 PN(se
.sum_exec_runtime
);
317 #ifdef CONFIG_SCHEDSTATS
327 SEQ_printf(m
, "%-25s:%20Ld\n",
328 "nr_switches", (long long)(p
->nvcsw
+ p
->nivcsw
));
340 SEQ_printf(m
, "%-25s:%20Ld\n",
341 "clock-delta", (long long)(t1
-t0
));
345 void proc_sched_set_task(struct task_struct
*p
)
347 #ifdef CONFIG_SCHEDSTATS
354 p
->se
.sum_exec_runtime
= 0;
355 p
->se
.prev_sum_exec_runtime
= 0;