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 #ifdef CONFIG_SCHEDSTATS
140 SEQ_printf(m
, " .%-30s: %ld\n", "bkl_count",
143 SEQ_printf(m
, " .%-30s: %ld\n", "nr_spread_over",
144 cfs_rq
->nr_spread_over
);
147 static void print_cpu(struct seq_file
*m
, int cpu
)
149 struct rq
*rq
= &per_cpu(runqueues
, cpu
);
153 unsigned int freq
= cpu_khz
? : 1;
155 SEQ_printf(m
, "\ncpu#%d, %u.%03u MHz\n",
156 cpu
, freq
/ 1000, (freq
% 1000));
159 SEQ_printf(m
, "\ncpu#%d\n", cpu
);
163 SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rq->x))
165 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rq->x))
168 SEQ_printf(m
, " .%-30s: %lu\n", "load",
172 P(nr_uninterruptible
);
173 SEQ_printf(m
, " .%-30s: %lu\n", "jiffies", jiffies
);
181 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.%06ld msecs\n", SPLIT_NS(now
));
209 SEQ_printf(m, " .%-40s: %Ld\n", #x, (long long)(x))
211 SEQ_printf(m, " .%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x))
212 PN(sysctl_sched_latency
);
213 PN(sysctl_sched_nr_latency
);
214 PN(sysctl_sched_wakeup_granularity
);
215 PN(sysctl_sched_batch_wakeup_granularity
);
216 PN(sysctl_sched_child_runs_first
);
217 P(sysctl_sched_features
);
221 for_each_online_cpu(cpu
)
229 static void sysrq_sched_debug_show(void)
231 sched_debug_show(NULL
, NULL
);
234 #ifdef CONFIG_FAIR_USER_SCHED
236 static DEFINE_MUTEX(root_user_share_mutex
);
239 root_user_share_read_proc(char *page
, char **start
, off_t off
, int count
,
240 int *eof
, void *data
)
242 return sprintf(page
, "%d\n", init_task_grp_load
);
246 root_user_share_write_proc(struct file
*file
, const char __user
*buffer
,
247 unsigned long count
, void *data
)
249 unsigned long shares
;
250 char kbuf
[sizeof(unsigned long)+1];
253 if (copy_from_user(kbuf
, buffer
, sizeof(kbuf
)))
256 shares
= simple_strtoul(kbuf
, NULL
, 0);
259 shares
= NICE_0_LOAD
;
261 mutex_lock(&root_user_share_mutex
);
263 init_task_grp_load
= shares
;
264 rc
= sched_group_set_shares(&init_task_grp
, shares
);
266 mutex_unlock(&root_user_share_mutex
);
268 return (rc
< 0 ? rc
: count
);
271 #endif /* CONFIG_FAIR_USER_SCHED */
273 static int sched_debug_open(struct inode
*inode
, struct file
*filp
)
275 return single_open(filp
, sched_debug_show
, NULL
);
278 static struct file_operations sched_debug_fops
= {
279 .open
= sched_debug_open
,
282 .release
= single_release
,
285 static int __init
init_sched_debug_procfs(void)
287 struct proc_dir_entry
*pe
;
289 pe
= create_proc_entry("sched_debug", 0644, NULL
);
293 pe
->proc_fops
= &sched_debug_fops
;
295 #ifdef CONFIG_FAIR_USER_SCHED
296 pe
= create_proc_entry("root_user_cpu_share", 0644, NULL
);
300 pe
->read_proc
= root_user_share_read_proc
;
301 pe
->write_proc
= root_user_share_write_proc
;
307 __initcall(init_sched_debug_procfs
);
309 void proc_sched_show_task(struct task_struct
*p
, struct seq_file
*m
)
315 if (lock_task_sighand(p
, &flags
)) {
316 num_threads
= atomic_read(&p
->signal
->count
);
317 unlock_task_sighand(p
, &flags
);
321 SEQ_printf(m
, "%s (%d, #threads: %d)\n", p
->comm
, p
->pid
, num_threads
);
322 SEQ_printf(m
, "----------------------------------------------\n");
324 SEQ_printf(m, "%-25s:%20Ld\n", #F, (long long)p->F)
326 SEQ_printf(m, "%-25s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)p->F))
330 PN(se
.sum_exec_runtime
);
332 #ifdef CONFIG_SCHEDSTATS
341 P(sched_info
.bkl_count
);
343 SEQ_printf(m
, "%-25s:%20Ld\n",
344 "nr_switches", (long long)(p
->nvcsw
+ p
->nivcsw
));
356 SEQ_printf(m
, "%-25s:%20Ld\n",
357 "clock-delta", (long long)(t1
-t0
));
361 void proc_sched_set_task(struct task_struct
*p
)
363 #ifdef CONFIG_SCHEDSTATS
369 p
->sched_info
.bkl_count
= 0;
371 p
->se
.sum_exec_runtime
= 0;
372 p
->se
.prev_sum_exec_runtime
= 0;