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
);
139 SEQ_printf(m
, " .%-30s: %ld\n", "bkl_cnt",
143 static void print_cpu(struct seq_file
*m
, int cpu
)
145 struct rq
*rq
= &per_cpu(runqueues
, cpu
);
149 unsigned int freq
= cpu_khz
? : 1;
151 SEQ_printf(m
, "\ncpu#%d, %u.%03u MHz\n",
152 cpu
, freq
/ 1000, (freq
% 1000));
155 SEQ_printf(m
, "\ncpu#%d\n", cpu
);
159 SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rq->x))
161 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rq->x))
164 SEQ_printf(m
, " .%-30s: %lu\n", "load",
168 P(nr_uninterruptible
);
169 SEQ_printf(m
, " .%-30s: %lu\n", "jiffies", jiffies
);
177 P(clock_deep_idle_events
);
187 print_cfs_stats(m
, cpu
);
189 print_rq(m
, rq
, cpu
);
192 static int sched_debug_show(struct seq_file
*m
, void *v
)
194 u64 now
= ktime_to_ns(ktime_get());
197 SEQ_printf(m
, "Sched Debug Version: v0.05-v20, %s %.*s\n",
198 init_utsname()->release
,
199 (int)strcspn(init_utsname()->version
, " "),
200 init_utsname()->version
);
202 SEQ_printf(m
, "now at %Lu.%06ld msecs\n", SPLIT_NS(now
));
204 for_each_online_cpu(cpu
)
212 static void sysrq_sched_debug_show(void)
214 sched_debug_show(NULL
, NULL
);
217 #ifdef CONFIG_FAIR_USER_SCHED
219 static DEFINE_MUTEX(root_user_share_mutex
);
222 root_user_share_read_proc(char *page
, char **start
, off_t off
, int count
,
223 int *eof
, void *data
)
227 len
= sprintf(page
, "%d\n", init_task_grp_load
);
233 root_user_share_write_proc(struct file
*file
, const char __user
*buffer
,
234 unsigned long count
, void *data
)
236 unsigned long shares
;
237 char kbuf
[sizeof(unsigned long)+1];
240 if (copy_from_user(kbuf
, buffer
, sizeof(kbuf
)))
243 shares
= simple_strtoul(kbuf
, NULL
, 0);
246 shares
= NICE_0_LOAD
;
248 mutex_lock(&root_user_share_mutex
);
250 init_task_grp_load
= shares
;
251 rc
= sched_group_set_shares(&init_task_grp
, shares
);
253 mutex_unlock(&root_user_share_mutex
);
255 return (rc
< 0 ? rc
: count
);
258 #endif /* CONFIG_FAIR_USER_SCHED */
260 static int sched_debug_open(struct inode
*inode
, struct file
*filp
)
262 return single_open(filp
, sched_debug_show
, NULL
);
265 static struct file_operations sched_debug_fops
= {
266 .open
= sched_debug_open
,
269 .release
= single_release
,
272 static int __init
init_sched_debug_procfs(void)
274 struct proc_dir_entry
*pe
;
276 pe
= create_proc_entry("sched_debug", 0644, NULL
);
280 pe
->proc_fops
= &sched_debug_fops
;
282 #ifdef CONFIG_FAIR_USER_SCHED
283 pe
= create_proc_entry("root_user_share", 0644, NULL
);
287 pe
->read_proc
= root_user_share_read_proc
;
288 pe
->write_proc
= root_user_share_write_proc
;
294 __initcall(init_sched_debug_procfs
);
296 void proc_sched_show_task(struct task_struct
*p
, struct seq_file
*m
)
302 if (lock_task_sighand(p
, &flags
)) {
303 num_threads
= atomic_read(&p
->signal
->count
);
304 unlock_task_sighand(p
, &flags
);
308 SEQ_printf(m
, "%s (%d, #threads: %d)\n", p
->comm
, p
->pid
, num_threads
);
309 SEQ_printf(m
, "----------------------------------------------\n");
311 SEQ_printf(m, "%-25s:%20Ld\n", #F, (long long)p->F)
313 SEQ_printf(m, "%-25s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)p->F))
317 PN(se
.sum_exec_runtime
);
319 #ifdef CONFIG_SCHEDSTATS
328 P(sched_info
.bkl_cnt
);
330 SEQ_printf(m
, "%-25s:%20Ld\n",
331 "nr_switches", (long long)(p
->nvcsw
+ p
->nivcsw
));
343 SEQ_printf(m
, "%-25s:%20Ld\n",
344 "clock-delta", (long long)(t1
-t0
));
348 void proc_sched_set_task(struct task_struct
*p
)
350 #ifdef CONFIG_SCHEDSTATS
356 p
->sched_info
.bkl_cnt
= 0;
358 p
->se
.sum_exec_runtime
= 0;
359 p
->se
.prev_sum_exec_runtime
= 0;