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;