/* * kernel/time/sched_debug.c * * Print the CFS rbtree * * Copyright(C) 2007, Red Hat, Inc., Ingo Molnar * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include <linux/proc_fs.h>#include <linux/sched.h>#include <linux/seq_file.h>#include <linux/kallsyms.h>#include <linux/utsname.h> /* * This allows printing both to /proc/sched_debug and * to the console */#define SEQ_printf(m, x...)			\ do {						\	if (m)					\		seq_printf(m, x);		\	else					\		printk(x);			\ } while (0) static voidprint_task(struct seq_file *m, struct rq *rq, struct task_struct *p){	if (rq->curr == p)		SEQ_printf(m, "R");	else		SEQ_printf(m, " "); 	SEQ_printf(m, "%15s %5d %15Ld %13Ld %13Ld %9Ld %5d ",		p->comm, p->pid,		(long long)p->se.fair_key,		(long long)(p->se.fair_key - rq->cfs.fair_clock),		(long long)p->se.wait_runtime,		(long long)(p->nvcsw + p->nivcsw),		p->prio);#ifdef CONFIG_SCHEDSTATS	SEQ_printf(m, "%15Ld %15Ld %15Ld %15Ld %15Ld\n",		(long long)p->se.sum_exec_runtime,		(long long)p->se.sum_wait_runtime,		(long long)p->se.sum_sleep_runtime,		(long long)p->se.wait_runtime_overruns,		(long long)p->se.wait_runtime_underruns);#else	SEQ_printf(m, "%15Ld %15Ld %15Ld %15Ld %15Ld\n",		0LL, 0LL, 0LL, 0LL, 0LL);#endif} static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu){	struct task_struct *g, *p; 	SEQ_printf(m,	"\nrunnable tasks:\n"	"            task   PID        tree-key         delta       waiting"	"  switches  prio"	"        sum-exec        sum-wait       sum-sleep"	"    wait-overrun   wait-underrun\n"	"------------------------------------------------------------------"	"----------------"	"------------------------------------------------"	"--------------------------------\n"); 	read_lock_irq(&tasklist_lock); 	do_each_thread(g, p) {		if (!p->se.on_rq || task_cpu(p) != rq_cpu)			continue; 		print_task(m, rq, p);	} while_each_thread(g, p); 	read_unlock_irq(&tasklist_lock);} static voidprint_cfs_rq_runtime_sum(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq){	s64 wait_runtime_rq_sum = 0;	struct task_struct *p;	struct rb_node *curr;	unsigned long flags;	struct rq *rq = &per_cpu(runqueues, cpu); 	spin_lock_irqsave(&rq->lock, flags);	curr = first_fair(cfs_rq);	while (curr) {		p = rb_entry(curr, struct task_struct, se.run_node);		wait_runtime_rq_sum += p->se.wait_runtime; 		curr = rb_next(curr);	}	spin_unlock_irqrestore(&rq->lock, flags); 	SEQ_printf(m, "  .%-30s: %Ld\n", "wait_runtime_rq_sum",		(long long)wait_runtime_rq_sum);} void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq){	SEQ_printf(m, "\ncfs_rq\n"); #define P(x) \	SEQ_printf(m, "  .%-30s: %Ld\n", #x, (long long)(cfs_rq->x)) 	P(fair_clock);	P(exec_clock);	P(wait_runtime);	P(wait_runtime_overruns);	P(wait_runtime_underruns);	P(sleeper_bonus);#undef P 	print_cfs_rq_runtime_sum(m, cpu, cfs_rq);} static void print_cpu(struct seq_file *m, int cpu){	struct rq *rq = &per_cpu(runqueues, cpu); #ifdef CONFIG_X86	{		unsigned int freq = cpu_khz ? : 1; 		SEQ_printf(m, "\ncpu#%d, %u.%03u MHz\n",			   cpu, freq / 1000, (freq % 1000));	}#else	SEQ_printf(m, "\ncpu#%d\n", cpu);#endif #define P(x) \	SEQ_printf(m, "  .%-30s: %Ld\n", #x, (long long)(rq->x)) 	P(nr_running);	SEQ_printf(m, "  .%-30s: %lu\n", "load",		   rq->ls.load.weight);	P(ls.delta_fair);	P(ls.delta_exec);	P(nr_switches);	P(nr_load_updates);	P(nr_uninterruptible);	SEQ_printf(m, "  .%-30s: %lu\n", "jiffies", jiffies);	P(next_balance);	P(curr->pid);	P(clock);	P(idle_clock);	P(prev_clock_raw);	P(clock_warps);	P(clock_overflows);	P(clock_deep_idle_events);	P(clock_max_delta);	P(cpu_load[0]);	P(cpu_load[1]);	P(cpu_load[2]);	P(cpu_load[3]);	P(cpu_load[4]);#undef P 	print_cfs_stats(m, cpu); 	print_rq(m, rq, cpu);} static int sched_debug_show(struct seq_file *m, void *v){	u64 now = ktime_to_ns(ktime_get());	int cpu; 	SEQ_printf(m, "Sched Debug Version: v0.05-v20, %s %.*s\n",		init_utsname()->release,		(int)strcspn(init_utsname()->version, " "),		init_utsname()->version); 	SEQ_printf(m, "now at %Lu nsecs\n", (unsigned long long)now); 	for_each_online_cpu(cpu)		print_cpu(m, cpu); 	SEQ_printf(m, "\n"); 	return 0;} static void sysrq_sched_debug_show(void){	sched_debug_show(NULL, NULL);} static int sched_debug_open(struct inode *inode, struct file *filp){	return single_open(filp, sched_debug_show, NULL);} static struct file_operations sched_debug_fops = {	.open		= sched_debug_open,	.read		= seq_read,	.llseek		= seq_lseek,	.release	= single_release,}; static int __init init_sched_debug_procfs(void){	struct proc_dir_entry *pe; 	pe = create_proc_entry("sched_debug", 0644, NULL);	if (!pe)		return -ENOMEM; 	pe->proc_fops = &sched_debug_fops; 	return 0;} __initcall(init_sched_debug_procfs); void proc_sched_show_task(struct task_struct *p, struct seq_file *m){	unsigned long flags;	int num_threads = 1; 	rcu_read_lock();	if (lock_task_sighand(p, &flags)) {		num_threads = atomic_read(&p->signal->count);		unlock_task_sighand(p, &flags);	}	rcu_read_unlock(); 	SEQ_printf(m, "%s (%d, #threads: %d)\n", p->comm, p->pid, num_threads);	SEQ_printf(m, "----------------------------------------------\n");#define P(F) \	SEQ_printf(m, "%-25s:%20Ld\n", #F, (long long)p->F) 	P(se.wait_runtime);	P(se.wait_start_fair);	P(se.exec_start);	P(se.sleep_start_fair);	P(se.sum_exec_runtime); #ifdef CONFIG_SCHEDSTATS	P(se.wait_start);	P(se.sleep_start);	P(se.block_start);	P(se.sleep_max);	P(se.block_max);	P(se.exec_max);	P(se.wait_max);	P(se.wait_runtime_overruns);	P(se.wait_runtime_underruns);	P(se.sum_wait_runtime);#endif	SEQ_printf(m, "%-25s:%20Ld\n",		   "nr_switches", (long long)(p->nvcsw + p->nivcsw));	P(se.load.weight);	P(policy);	P(prio);#undef P 	{		u64 t0, t1; 		t0 = sched_clock();		t1 = sched_clock();		SEQ_printf(m, "%-25s:%20Ld\n",			   "clock-delta", (long long)(t1-t0));	}} void proc_sched_set_task(struct task_struct *p){#ifdef CONFIG_SCHEDSTATS	p->se.sleep_max = p->se.block_max = p->se.exec_max = p->se.wait_max = 0;	p->se.wait_runtime_overruns = p->se.wait_runtime_underruns = 0;#endif	p->se.sum_exec_runtime = 0;	p->se.prev_sum_exec_runtime	= 0;}