/*
   * 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>

  static DEFINE_SPINLOCK(sched_debug_lock);

  /*
   * 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)

  /*
   * Ease the printing of nsec fields:
   */

  static long long nsec_high(unsigned long long nsec)

  {

  	if ((long long)nsec < 0) {

  		nsec = -nsec;
  		do_div(nsec, 1000000);
  		return -nsec;
  	}
  	do_div(nsec, 1000000);
  
  	return nsec;
  }

  static unsigned long nsec_low(unsigned long long nsec)

  {

  	if ((long long)nsec < 0)

  		nsec = -nsec;
  
  	return do_div(nsec, 1000000);
  }
  
  #define SPLIT_NS(x) nsec_high(x), nsec_low(x)

  #ifdef CONFIG_FAIR_GROUP_SCHED

  static void print_cfs_group_stats(struct seq_file *m, int cpu, struct task_group *tg)

  {
  	struct sched_entity *se = tg->se[cpu];
  	if (!se)
  		return;
  
  #define P(F) \
  	SEQ_printf(m, "  .%-30s: %lld
  ", #F, (long long)F)
  #define PN(F) \
  	SEQ_printf(m, "  .%-30s: %lld.%06ld
  ", #F, SPLIT_NS((long long)F))
  
  	PN(se->exec_start);
  	PN(se->vruntime);
  	PN(se->sum_exec_runtime);
  #ifdef CONFIG_SCHEDSTATS

  	PN(se->statistics.wait_start);
  	PN(se->statistics.sleep_start);
  	PN(se->statistics.block_start);
  	PN(se->statistics.sleep_max);
  	PN(se->statistics.block_max);
  	PN(se->statistics.exec_max);
  	PN(se->statistics.slice_max);
  	PN(se->statistics.wait_max);
  	PN(se->statistics.wait_sum);
  	P(se->statistics.wait_count);

  #endif
  	P(se->load.weight);
  #undef PN
  #undef P
  }
  #endif

  #ifdef CONFIG_CGROUP_SCHED
  static char group_path[PATH_MAX];
  
  static char *task_group_path(struct task_group *tg)
  {

  	if (autogroup_path(tg, group_path, PATH_MAX))
  		return group_path;

  	/*
  	 * May be NULL if the underlying cgroup isn't fully-created yet
  	 */
  	if (!tg->css.cgroup) {
  		group_path[0] = '\0';
  		return group_path;
  	}
  	cgroup_path(tg->css.cgroup, group_path, PATH_MAX);
  	return group_path;
  }
  #endif

  static void

  print_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 %9Ld.%06ld %9Ld %5d ",

  		p->comm, p->pid,

  		SPLIT_NS(p->se.vruntime),

  		(long long)(p->nvcsw + p->nivcsw),

  		p->prio);

  #ifdef CONFIG_SCHEDSTATS

  	SEQ_printf(m, "%9Ld.%06ld %9Ld.%06ld %9Ld.%06ld",

  		SPLIT_NS(p->se.vruntime),
  		SPLIT_NS(p->se.sum_exec_runtime),

  		SPLIT_NS(p->se.statistics.sum_sleep_runtime));

  #else

  	SEQ_printf(m, "%15Ld %15Ld %15Ld.%06ld %15Ld.%06ld %15Ld.%06ld",

  		0LL, 0LL, 0LL, 0L, 0LL, 0L, 0LL, 0L);

  #endif

  #ifdef CONFIG_CGROUP_SCHED
  	SEQ_printf(m, " %s", task_group_path(task_group(p)));
  #endif

  	SEQ_printf(m, "
  ");

  }

  static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu)

  {
  	struct task_struct *g, *p;

  	unsigned long flags;

  
  	SEQ_printf(m,
  	"
  runnable tasks:
  "

  	"            task   PID         tree-key  switches  prio"
  	"     exec-runtime         sum-exec        sum-sleep
  "

  	"------------------------------------------------------"

  	"----------------------------------------------------
  ");

  	read_lock_irqsave(&tasklist_lock, flags);

  
  	do_each_thread(g, p) {

  		if (!p->on_rq || task_cpu(p) != rq_cpu)

  			continue;

  		print_task(m, rq, p);

  	} while_each_thread(g, p);

  	read_unlock_irqrestore(&tasklist_lock, flags);

  }

  void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)

  {

  	s64 MIN_vruntime = -1, min_vruntime, max_vruntime = -1,
  		spread, rq0_min_vruntime, spread0;

  	struct rq *rq = cpu_rq(cpu);

  	struct sched_entity *last;
  	unsigned long flags;

  #ifdef CONFIG_FAIR_GROUP_SCHED
  	SEQ_printf(m, "
  cfs_rq[%d]:%s
  ", cpu, task_group_path(cfs_rq->tg));
  #else

  	SEQ_printf(m, "
  cfs_rq[%d]:
  ", cpu);

  #endif

  	SEQ_printf(m, "  .%-30s: %Ld.%06ld
  ", "exec_clock",
  			SPLIT_NS(cfs_rq->exec_clock));

  	raw_spin_lock_irqsave(&rq->lock, flags);

  	if (cfs_rq->rb_leftmost)

  		MIN_vruntime = (__pick_first_entity(cfs_rq))->vruntime;

  	last = __pick_last_entity(cfs_rq);
  	if (last)
  		max_vruntime = last->vruntime;

  	min_vruntime = cfs_rq->min_vruntime;

  	rq0_min_vruntime = cpu_rq(0)->cfs.min_vruntime;

  	raw_spin_unlock_irqrestore(&rq->lock, flags);

  	SEQ_printf(m, "  .%-30s: %Ld.%06ld
  ", "MIN_vruntime",
  			SPLIT_NS(MIN_vruntime));
  	SEQ_printf(m, "  .%-30s: %Ld.%06ld
  ", "min_vruntime",
  			SPLIT_NS(min_vruntime));
  	SEQ_printf(m, "  .%-30s: %Ld.%06ld
  ", "max_vruntime",
  			SPLIT_NS(max_vruntime));

  	spread = max_vruntime - MIN_vruntime;

  	SEQ_printf(m, "  .%-30s: %Ld.%06ld
  ", "spread",
  			SPLIT_NS(spread));

  	spread0 = min_vruntime - rq0_min_vruntime;

  	SEQ_printf(m, "  .%-30s: %Ld.%06ld
  ", "spread0",
  			SPLIT_NS(spread0));

  	SEQ_printf(m, "  .%-30s: %d
  ", "nr_spread_over",

  			cfs_rq->nr_spread_over);

  	SEQ_printf(m, "  .%-30s: %ld
  ", "nr_running", cfs_rq->nr_running);
  	SEQ_printf(m, "  .%-30s: %ld
  ", "load", cfs_rq->load.weight);

  #ifdef CONFIG_FAIR_GROUP_SCHED
  #ifdef CONFIG_SMP

  	SEQ_printf(m, "  .%-30s: %Ld.%06ld
  ", "load_avg",
  			SPLIT_NS(cfs_rq->load_avg));
  	SEQ_printf(m, "  .%-30s: %Ld.%06ld
  ", "load_period",
  			SPLIT_NS(cfs_rq->load_period));
  	SEQ_printf(m, "  .%-30s: %ld
  ", "load_contrib",
  			cfs_rq->load_contribution);
  	SEQ_printf(m, "  .%-30s: %d
  ", "load_tg",

  			atomic_read(&cfs_rq->tg->load_weight));

  #endif

  	print_cfs_group_stats(m, cpu, cfs_rq->tg);

  #endif

  }

  void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq)
  {

  #ifdef CONFIG_RT_GROUP_SCHED
  	SEQ_printf(m, "
  rt_rq[%d]:%s
  ", cpu, task_group_path(rt_rq->tg));
  #else

  	SEQ_printf(m, "
  rt_rq[%d]:
  ", cpu);

  #endif

  
  #define P(x) \
  	SEQ_printf(m, "  .%-30s: %Ld
  ", #x, (long long)(rt_rq->x))
  #define PN(x) \
  	SEQ_printf(m, "  .%-30s: %Ld.%06ld
  ", #x, SPLIT_NS(rt_rq->x))
  
  	P(rt_nr_running);
  	P(rt_throttled);
  	PN(rt_time);
  	PN(rt_runtime);
  
  #undef PN
  #undef P
  }

  extern __read_mostly int sched_clock_running;

  static void print_cpu(struct seq_file *m, int cpu)

  {

  	struct rq *rq = cpu_rq(cpu);

  	unsigned long flags;

  
  #ifdef CONFIG_X86
  	{
  		unsigned int freq = cpu_khz ? : 1;
  
  		SEQ_printf(m, "
  cpu#%d, %u.%03u MHz
  ",
  			   cpu, freq / 1000, (freq % 1000));
  	}
  #else
  	SEQ_printf(m, "
  cpu#%d
  ", cpu);
  #endif
  
  #define P(x) \
  	SEQ_printf(m, "  .%-30s: %Ld
  ", #x, (long long)(rq->x))

  #define PN(x) \
  	SEQ_printf(m, "  .%-30s: %Ld.%06ld
  ", #x, SPLIT_NS(rq->x))

  
  	P(nr_running);
  	SEQ_printf(m, "  .%-30s: %lu
  ", "load",

  		   rq->load.weight);

  	P(nr_switches);
  	P(nr_load_updates);
  	P(nr_uninterruptible);

  	PN(next_balance);

  	P(curr->pid);

  	PN(clock);

  	P(cpu_load[0]);
  	P(cpu_load[1]);
  	P(cpu_load[2]);
  	P(cpu_load[3]);
  	P(cpu_load[4]);
  #undef P

  #undef PN

  #ifdef CONFIG_SCHEDSTATS
  #define P(n) SEQ_printf(m, "  .%-30s: %d
  ", #n, rq->n);

  #define P64(n) SEQ_printf(m, "  .%-30s: %Ld
  ", #n, rq->n);

  	P(yld_count);
  
  	P(sched_switch);
  	P(sched_count);
  	P(sched_goidle);

  #ifdef CONFIG_SMP
  	P64(avg_idle);
  #endif

  
  	P(ttwu_count);
  	P(ttwu_local);

  #undef P

  #undef P64

  #endif

  	spin_lock_irqsave(&sched_debug_lock, flags);

  	print_cfs_stats(m, cpu);

  	print_rt_stats(m, cpu);

  	rcu_read_lock();

  	print_rq(m, rq, cpu);

  	rcu_read_unlock();
  	spin_unlock_irqrestore(&sched_debug_lock, flags);

  }

  static const char *sched_tunable_scaling_names[] = {
  	"none",
  	"logaritmic",
  	"linear"
  };

  static int sched_debug_show(struct seq_file *m, void *v)
  {

  	u64 ktime, sched_clk, cpu_clk;
  	unsigned long flags;

  	int cpu;

  	local_irq_save(flags);
  	ktime = ktime_to_ns(ktime_get());
  	sched_clk = sched_clock();
  	cpu_clk = local_clock();
  	local_irq_restore(flags);
  
  	SEQ_printf(m, "Sched Debug Version: v0.10, %s %.*s
  ",

  		init_utsname()->release,
  		(int)strcspn(init_utsname()->version, " "),
  		init_utsname()->version);

  #define P(x) \
  	SEQ_printf(m, "%-40s: %Ld
  ", #x, (long long)(x))
  #define PN(x) \
  	SEQ_printf(m, "%-40s: %Ld.%06ld
  ", #x, SPLIT_NS(x))
  	PN(ktime);
  	PN(sched_clk);
  	PN(cpu_clk);
  	P(jiffies);
  #ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
  	P(sched_clock_stable);
  #endif
  #undef PN
  #undef P
  
  	SEQ_printf(m, "
  ");
  	SEQ_printf(m, "sysctl_sched
  ");

  #define P(x) \

  	SEQ_printf(m, "  .%-40s: %Ld
  ", #x, (long long)(x))

  #define PN(x) \

  	SEQ_printf(m, "  .%-40s: %Ld.%06ld
  ", #x, SPLIT_NS(x))

  	PN(sysctl_sched_latency);

  	PN(sysctl_sched_min_granularity);

  	PN(sysctl_sched_wakeup_granularity);

  	P(sysctl_sched_child_runs_first);

  	P(sysctl_sched_features);
  #undef PN
  #undef P

  	SEQ_printf(m, "  .%-40s: %d (%s)
  ", "sysctl_sched_tunable_scaling",
  		sysctl_sched_tunable_scaling,
  		sched_tunable_scaling_names[sysctl_sched_tunable_scaling]);

  	for_each_online_cpu(cpu)

  		print_cpu(m, cpu);

  
  	SEQ_printf(m, "
  ");
  
  	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 const 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 = proc_create("sched_debug", 0444, NULL, &sched_debug_fops);

  	if (!pe)
  		return -ENOMEM;

  	return 0;
  }
  
  __initcall(init_sched_debug_procfs);
  
  void proc_sched_show_task(struct task_struct *p, struct seq_file *m)
  {

  	unsigned long nr_switches;

  	SEQ_printf(m, "%s (%d, #threads: %d)
  ", p->comm, p->pid,
  						get_nr_threads(p));

  	SEQ_printf(m,
  		"---------------------------------------------------------
  ");

  #define __P(F) \
  	SEQ_printf(m, "%-35s:%21Ld
  ", #F, (long long)F)

  #define P(F) \

  	SEQ_printf(m, "%-35s:%21Ld
  ", #F, (long long)p->F)

  #define __PN(F) \
  	SEQ_printf(m, "%-35s:%14Ld.%06ld
  ", #F, SPLIT_NS((long long)F))

  #define PN(F) \

  	SEQ_printf(m, "%-35s:%14Ld.%06ld
  ", #F, SPLIT_NS((long long)p->F))

  	PN(se.exec_start);
  	PN(se.vruntime);
  	PN(se.sum_exec_runtime);

  	nr_switches = p->nvcsw + p->nivcsw;

  #ifdef CONFIG_SCHEDSTATS

  	PN(se.statistics.wait_start);
  	PN(se.statistics.sleep_start);
  	PN(se.statistics.block_start);
  	PN(se.statistics.sleep_max);
  	PN(se.statistics.block_max);
  	PN(se.statistics.exec_max);
  	PN(se.statistics.slice_max);
  	PN(se.statistics.wait_max);
  	PN(se.statistics.wait_sum);
  	P(se.statistics.wait_count);
  	PN(se.statistics.iowait_sum);
  	P(se.statistics.iowait_count);

  	P(se.nr_migrations);

  	P(se.statistics.nr_migrations_cold);
  	P(se.statistics.nr_failed_migrations_affine);
  	P(se.statistics.nr_failed_migrations_running);
  	P(se.statistics.nr_failed_migrations_hot);
  	P(se.statistics.nr_forced_migrations);
  	P(se.statistics.nr_wakeups);
  	P(se.statistics.nr_wakeups_sync);
  	P(se.statistics.nr_wakeups_migrate);
  	P(se.statistics.nr_wakeups_local);
  	P(se.statistics.nr_wakeups_remote);
  	P(se.statistics.nr_wakeups_affine);
  	P(se.statistics.nr_wakeups_affine_attempts);
  	P(se.statistics.nr_wakeups_passive);
  	P(se.statistics.nr_wakeups_idle);

  
  	{
  		u64 avg_atom, avg_per_cpu;
  
  		avg_atom = p->se.sum_exec_runtime;
  		if (nr_switches)
  			do_div(avg_atom, nr_switches);
  		else
  			avg_atom = -1LL;
  
  		avg_per_cpu = p->se.sum_exec_runtime;

  		if (p->se.nr_migrations) {

  			avg_per_cpu = div64_u64(avg_per_cpu,
  						p->se.nr_migrations);

  		} else {

  			avg_per_cpu = -1LL;

  		}

  
  		__PN(avg_atom);
  		__PN(avg_per_cpu);
  	}

  #endif

  	__P(nr_switches);

  	SEQ_printf(m, "%-35s:%21Ld
  ",

  		   "nr_voluntary_switches", (long long)p->nvcsw);
  	SEQ_printf(m, "%-35s:%21Ld
  ",
  		   "nr_involuntary_switches", (long long)p->nivcsw);

  	P(se.load.weight);
  	P(policy);
  	P(prio);

  #undef PN

  #undef __PN
  #undef P
  #undef __P

  
  	{

  		unsigned int this_cpu = raw_smp_processor_id();

  		u64 t0, t1;

  		t0 = cpu_clock(this_cpu);
  		t1 = cpu_clock(this_cpu);

  		SEQ_printf(m, "%-35s:%21Ld
  ",

  			   "clock-delta", (long long)(t1-t0));
  	}
  }
  
  void proc_sched_set_task(struct task_struct *p)
  {

  #ifdef CONFIG_SCHEDSTATS

  	memset(&p->se.statistics, 0, sizeof(p->se.statistics));

  #endif

  }