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, u64 now)
39 SEQ_printf(m, "%15s %5d %15Ld %13Ld %13Ld %9Ld %5d "
40 "%15Ld %15Ld %15Ld %15Ld %15Ld\n",
42 (long long)p->se.fair_key,
43 (long long)(p->se.fair_key - rq->cfs.fair_clock),
44 (long long)p->se.wait_runtime,
45 (long long)(p->nvcsw + p->nivcsw),
47 (long long)p->se.sum_exec_runtime,
48 (long long)p->se.sum_wait_runtime,
49 (long long)p->se.sum_sleep_runtime,
50 (long long)p->se.wait_runtime_overruns,
51 (long long)p->se.wait_runtime_underruns);
54 static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu, u64 now)
56 struct task_struct *g, *p;
60 " task PID tree-key delta waiting"
62 " sum-exec sum-wait sum-sleep"
63 " wait-overrun wait-underrun\n"
64 "------------------------------------------------------------------"
66 "------------------------------------------------"
67 "--------------------------------\n");
69 read_lock_irq(&tasklist_lock);
71 do_each_thread(g, p) {
72 if (!p->se.on_rq || task_cpu(p) != rq_cpu)
75 print_task(m, rq, p, now);
76 } while_each_thread(g, p);
78 read_unlock_irq(&tasklist_lock);
82 print_cfs_rq_runtime_sum(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
84 s64 wait_runtime_rq_sum = 0;
85 struct task_struct *p;
88 struct rq *rq = &per_cpu(runqueues, cpu);
90 spin_lock_irqsave(&rq->lock, flags);
91 curr = first_fair(cfs_rq);
93 p = rb_entry(curr, struct task_struct, se.run_node);
94 wait_runtime_rq_sum += p->se.wait_runtime;
98 spin_unlock_irqrestore(&rq->lock, flags);
100 SEQ_printf(m, " .%-30s: %Ld\n", "wait_runtime_rq_sum",
101 (long long)wait_runtime_rq_sum);
104 void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq, u64 now)
106 SEQ_printf(m, "\ncfs_rq %p\n", cfs_rq);
109 SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(cfs_rq->x))
114 P(wait_runtime_overruns);
115 P(wait_runtime_underruns);
119 print_cfs_rq_runtime_sum(m, cpu, cfs_rq);
122 static void print_cpu(struct seq_file *m, int cpu, u64 now)
124 struct rq *rq = &per_cpu(runqueues, cpu);
128 unsigned int freq = cpu_khz ? : 1;
130 SEQ_printf(m, "\ncpu#%d, %u.%03u MHz\n",
131 cpu, freq / 1000, (freq % 1000));
134 SEQ_printf(m, "\ncpu#%d\n", cpu);
138 SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rq->x))
141 SEQ_printf(m, " .%-30s: %lu\n", "load",
147 P(nr_uninterruptible);
148 SEQ_printf(m, " .%-30s: %lu\n", "jiffies", jiffies);
155 P(clock_unstable_events);
164 print_cfs_stats(m, cpu, now);
166 print_rq(m, rq, cpu, now);
169 static int sched_debug_show(struct seq_file *m, void *v)
171 u64 now = ktime_to_ns(ktime_get());
174 SEQ_printf(m, "Sched Debug Version: v0.04, cfs-v20, %s %.*s\n",
175 init_utsname()->release,
176 (int)strcspn(init_utsname()->version, " "),
177 init_utsname()->version);
179 SEQ_printf(m, "now at %Lu nsecs\n", (unsigned long long)now);
181 for_each_online_cpu(cpu)
182 print_cpu(m, cpu, now);
189 void sysrq_sched_debug_show(void)
191 sched_debug_show(NULL, NULL);
194 static int sched_debug_open(struct inode *inode, struct file *filp)
196 return single_open(filp, sched_debug_show, NULL);
199 static struct file_operations sched_debug_fops = {
200 .open = sched_debug_open,
203 .release = seq_release,
206 static int __init init_sched_debug_procfs(void)
208 struct proc_dir_entry *pe;
210 pe = create_proc_entry("sched_debug", 0644, NULL);
214 pe->proc_fops = &sched_debug_fops;
219 __initcall(init_sched_debug_procfs);
221 void proc_sched_show_task(struct task_struct *p, struct seq_file *m)
227 if (lock_task_sighand(p, &flags)) {
228 num_threads = atomic_read(&p->signal->count);
229 unlock_task_sighand(p, &flags);
233 SEQ_printf(m, "%s (%d, #threads: %d)\n", p->comm, p->pid, num_threads);
234 SEQ_printf(m, "----------------------------------------------\n");
236 SEQ_printf(m, "%-25s:%20Ld\n", #F, (long long)p->F)
239 P(se.wait_start_fair);
242 P(se.sleep_start_fair);
249 P(se.wait_runtime_overruns);
250 P(se.wait_runtime_underruns);
251 P(se.sum_wait_runtime);
252 P(se.sum_exec_runtime);
253 SEQ_printf(m, "%-25s:%20Ld\n",
254 "nr_switches", (long long)(p->nvcsw + p->nivcsw));
265 SEQ_printf(m, "%-25s:%20Ld\n",
266 "clock-delta", (long long)(t1-t0));
270 void proc_sched_set_task(struct task_struct *p)
272 p->se.sleep_max = p->se.block_max = p->se.exec_max = p->se.wait_max = 0;
273 p->se.wait_runtime_overruns = p->se.wait_runtime_underruns = 0;
274 p->se.sum_exec_runtime = 0;