debug.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * kernel/sched/debug.c
 *
 * Print the CFS rbtree and other debugging details
 *
 * Copyright(C) 2007, Red Hat, Inc., Ingo Molnar
 */
#include "sched.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					\
		pr_cont(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)

#define SCHED_FEAT(name, enabled)	\
	#name ,

static const char * const sched_feat_names[] = {
#include "features.h"
};

#undef SCHED_FEAT

static int sched_feat_show(struct seq_file *m, void *v)
{
	int i;

	for (i = 0; i < __SCHED_FEAT_NR; i++) {
		if (!(sysctl_sched_features & (1UL << i)))
			seq_puts(m, "NO_");
		seq_printf(m, "%s ", sched_feat_names[i]);
	}
	seq_puts(m, "\n");

	return 0;
}

#ifdef CONFIG_JUMP_LABEL

#define jump_label_key__true  STATIC_KEY_INIT_TRUE
#define jump_label_key__false STATIC_KEY_INIT_FALSE

#define SCHED_FEAT(name, enabled)	\
	jump_label_key__##enabled ,

struct static_key sched_feat_keys[__SCHED_FEAT_NR] = {
#include "features.h"
};

#undef SCHED_FEAT

static void sched_feat_disable(int i)
{
	static_key_disable_cpuslocked(&sched_feat_keys[i]);
}

static void sched_feat_enable(int i)
{
	static_key_enable_cpuslocked(&sched_feat_keys[i]);
}
#else
static void sched_feat_disable(int i) { };
static void sched_feat_enable(int i) { };
#endif /* CONFIG_JUMP_LABEL */

static int sched_feat_set(char *cmp)
{
	int i;
	int neg = 0;

	if (strncmp(cmp, "NO_", 3) == 0) {
		neg = 1;
		cmp += 3;
	}

	i = match_string(sched_feat_names, __SCHED_FEAT_NR, cmp);
	if (i < 0)
		return i;

	if (neg) {
		sysctl_sched_features &= ~(1UL << i);
		sched_feat_disable(i);
	} else {
		sysctl_sched_features |= (1UL << i);
		sched_feat_enable(i);
	}

	return 0;
}

static ssize_t
sched_feat_write(struct file *filp, const char __user *ubuf,
		size_t cnt, loff_t *ppos)
{
	char buf[64];
	char *cmp;
	int ret;
	struct inode *inode;

	if (cnt > 63)
		cnt = 63;

	if (copy_from_user(&buf, ubuf, cnt))
		return -EFAULT;

	buf[cnt] = 0;
	cmp = strstrip(buf);

	/* Ensure the static_key remains in a consistent state */
	inode = file_inode(filp);
	cpus_read_lock();
	inode_lock(inode);
	ret = sched_feat_set(cmp);
	inode_unlock(inode);
	cpus_read_unlock();
	if (ret < 0)
		return ret;

	*ppos += cnt;

	return cnt;
}

static int sched_feat_open(struct inode *inode, struct file *filp)
{
	return single_open(filp, sched_feat_show, NULL);
}

static const struct file_operations sched_feat_fops = {
	.open		= sched_feat_open,
	.write		= sched_feat_write,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

__read_mostly bool sched_debug_enabled;

static __init int sched_init_debug(void)
{
	debugfs_create_file("sched_features", 0644, NULL, NULL,
			&sched_feat_fops);

	debugfs_create_bool("sched_debug", 0644, NULL,
			&sched_debug_enabled);

	return 0;
}
late_initcall(sched_init_debug);

#ifdef CONFIG_SMP

#ifdef CONFIG_SYSCTL

static struct ctl_table sd_ctl_dir[] = {
	{
		.procname	= "sched_domain",
		.mode		= 0555,
	},
	{}
};

static struct ctl_table sd_ctl_root[] = {
	{
		.procname	= "kernel",
		.mode		= 0555,
		.child		= sd_ctl_dir,
	},
	{}
};

static struct ctl_table *sd_alloc_ctl_entry(int n)
{
	struct ctl_table *entry =
		kcalloc(n, sizeof(struct ctl_table), GFP_KERNEL);

	return entry;
}

static void sd_free_ctl_entry(struct ctl_table **tablep)
{
	struct ctl_table *entry;

	/*
	 * In the intermediate directories, both the child directory and
	 * procname are dynamically allocated and could fail but the mode
	 * will always be set. In the lowest directory the names are
	 * static strings and all have proc handlers.
	 */
	for (entry = *tablep; entry->mode; entry++) {
		if (entry->child)
			sd_free_ctl_entry(&entry->child);
		if (entry->proc_handler == NULL)
			kfree(entry->procname);
	}

	kfree(*tablep);
	*tablep = NULL;
}

static void
set_table_entry(struct ctl_table *entry,
		const char *procname, void *data, int maxlen,
		umode_t mode, proc_handler *proc_handler)
{
	entry->procname = procname;
	entry->data = data;
	entry->maxlen = maxlen;
	entry->mode = mode;
	entry->proc_handler = proc_handler;
}

static struct ctl_table *
sd_alloc_ctl_domain_table(struct sched_domain *sd)
{
	struct ctl_table *table = sd_alloc_ctl_entry(9);

	if (table == NULL)
		return NULL;

	set_table_entry(&table[0], "min_interval",	  &sd->min_interval,	    sizeof(long), 0644, proc_doulongvec_minmax);
	set_table_entry(&table[1], "max_interval",	  &sd->max_interval,	    sizeof(long), 0644, proc_doulongvec_minmax);
	set_table_entry(&table[2], "busy_factor",	  &sd->busy_factor,	    sizeof(int),  0644, proc_dointvec_minmax);
	set_table_entry(&table[3], "imbalance_pct",	  &sd->imbalance_pct,	    sizeof(int),  0644, proc_dointvec_minmax);
	set_table_entry(&table[4], "cache_nice_tries",	  &sd->cache_nice_tries,    sizeof(int),  0644, proc_dointvec_minmax);
	set_table_entry(&table[5], "flags",		  &sd->flags,		    sizeof(int),  0644, proc_dointvec_minmax);
	set_table_entry(&table[6], "max_newidle_lb_cost", &sd->max_newidle_lb_cost, sizeof(long), 0644, proc_doulongvec_minmax);
	set_table_entry(&table[7], "name",		  sd->name,	       CORENAME_MAX_SIZE, 0444, proc_dostring);
	/* &table[8] is terminator */

	return table;
}

static struct ctl_table *sd_alloc_ctl_cpu_table(int cpu)
{
	struct ctl_table *entry, *table;
	struct sched_domain *sd;
	int domain_num = 0, i;
	char buf[32];

	for_each_domain(cpu, sd)
		domain_num++;
	entry = table = sd_alloc_ctl_entry(domain_num + 1);
	if (table == NULL)
		return NULL;

	i = 0;
	for_each_domain(cpu, sd) {
		snprintf(buf, 32, "domain%d", i);
		entry->procname = kstrdup(buf, GFP_KERNEL);
		entry->mode = 0555;
		entry->child = sd_alloc_ctl_domain_table(sd);
		entry++;
		i++;
	}
	return table;
}

static cpumask_var_t		sd_sysctl_cpus;
static struct ctl_table_header	*sd_sysctl_header;

void register_sched_domain_sysctl(void)
{
	static struct ctl_table *cpu_entries;
	static struct ctl_table **cpu_idx;
	static bool init_done = false;
	char buf[32];
	int i;

	if (!cpu_entries) {
		cpu_entries = sd_alloc_ctl_entry(num_possible_cpus() + 1);
		if (!cpu_entries)
			return;

		WARN_ON(sd_ctl_dir[0].child);
		sd_ctl_dir[0].child = cpu_entries;
	}

	if (!cpu_idx) {
		struct ctl_table *e = cpu_entries;

		cpu_idx = kcalloc(nr_cpu_ids, sizeof(struct ctl_table*), GFP_KERNEL);
		if (!cpu_idx)
			return;

		/* deal with sparse possible map */
		for_each_possible_cpu(i) {
			cpu_idx[i] = e;
			e++;
		}
	}

	if (!cpumask_available(sd_sysctl_cpus)) {
		if (!alloc_cpumask_var(&sd_sysctl_cpus, GFP_KERNEL))
			return;
	}

	if (!init_done) {
		init_done = true;
		/* init to possible to not have holes in @cpu_entries */
		cpumask_copy(sd_sysctl_cpus, cpu_possible_mask);
	}

	for_each_cpu(i, sd_sysctl_cpus) {
		struct ctl_table *e = cpu_idx[i];

		if (e->child)
			sd_free_ctl_entry(&e->child);

		if (!e->procname) {
			snprintf(buf, 32, "cpu%d", i);
			e->procname = kstrdup(buf, GFP_KERNEL);
		}
		e->mode = 0555;
		e->child = sd_alloc_ctl_cpu_table(i);

		__cpumask_clear_cpu(i, sd_sysctl_cpus);
	}

	WARN_ON(sd_sysctl_header);
	sd_sysctl_header = register_sysctl_table(sd_ctl_root);
}

void dirty_sched_domain_sysctl(int cpu)
{
	if (cpumask_available(sd_sysctl_cpus))
		__cpumask_set_cpu(cpu, sd_sysctl_cpus);
}

/* may be called multiple times per register */
void unregister_sched_domain_sysctl(void)
{
	unregister_sysctl_table(sd_sysctl_header);
	sd_sysctl_header = NULL;
}
#endif /* CONFIG_SYSCTL */
#endif /* CONFIG_SMP */

#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];

#define P(F)		SEQ_printf(m, "  .%-30s: %lld\n",	#F, (long long)F)
#define P_SCHEDSTAT(F)	SEQ_printf(m, "  .%-30s: %lld\n",	#F, (long long)schedstat_val(F))
#define PN(F)		SEQ_printf(m, "  .%-30s: %lld.%06ld\n", #F, SPLIT_NS((long long)F))
#define PN_SCHEDSTAT(F)	SEQ_printf(m, "  .%-30s: %lld.%06ld\n", #F, SPLIT_NS((long long)schedstat_val(F)))

	if (!se)
		return;

	PN(se->exec_start);
	PN(se->vruntime);
	PN(se->sum_exec_runtime);

	if (schedstat_enabled()) {
		PN_SCHEDSTAT(se->statistics.wait_start);
		PN_SCHEDSTAT(se->statistics.sleep_start);
		PN_SCHEDSTAT(se->statistics.block_start);
		PN_SCHEDSTAT(se->statistics.sleep_max);
		PN_SCHEDSTAT(se->statistics.block_max);
		PN_SCHEDSTAT(se->statistics.exec_max);
		PN_SCHEDSTAT(se->statistics.slice_max);
		PN_SCHEDSTAT(se->statistics.wait_max);
		PN_SCHEDSTAT(se->statistics.wait_sum);
		P_SCHEDSTAT(se->statistics.wait_count);
	}

	P(se->load.weight);
#ifdef CONFIG_SMP
	P(se->avg.load_avg);
	P(se->avg.util_avg);
	P(se->avg.runnable_avg);
#endif

#undef PN_SCHEDSTAT
#undef PN
#undef P_SCHEDSTAT
#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;

	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, " %c", task_state_to_char(p));

	SEQ_printf(m, "%15s %5d %9Ld.%06ld %9Ld %5d ",
		p->comm, task_pid_nr(p),
		SPLIT_NS(p->se.vruntime),
		(long long)(p->nvcsw + p->nivcsw),
		p->prio);

	SEQ_printf(m, "%9Ld.%06ld %9Ld.%06ld %9Ld.%06ld",
		SPLIT_NS(schedstat_val_or_zero(p->se.statistics.wait_sum)),
		SPLIT_NS(p->se.sum_exec_runtime),
		SPLIT_NS(schedstat_val_or_zero(p->se.statistics.sum_sleep_runtime)));

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

	SEQ_printf(m, "\n");
}

static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu)
{
	struct task_struct *g, *p;

	SEQ_printf(m, "\n");
	SEQ_printf(m, "runnable tasks:\n");
	SEQ_printf(m, " S           task   PID         tree-key  switches  prio"
		   "     wait-time             sum-exec        sum-sleep\n");
	SEQ_printf(m, "-------------------------------------------------------"
		   "----------------------------------------------------\n");

	rcu_read_lock();
	for_each_process_thread(g, p) {
		if (task_cpu(p) != rq_cpu)
			continue;

		print_task(m, rq, p);
	}
	rcu_read_unlock();
}

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, "\n");
	SEQ_printf(m, "cfs_rq[%d]:%s\n", cpu, task_group_path(cfs_rq->tg));
#else
	SEQ_printf(m, "\n");
	SEQ_printf(m, "cfs_rq[%d]:\n", cpu);
#endif
	SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", "exec_clock",
			SPLIT_NS(cfs_rq->exec_clock));

	raw_spin_lock_irqsave(&rq->lock, flags);
	if (rb_first_cached(&cfs_rq->tasks_timeline))
		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\n", "MIN_vruntime",
			SPLIT_NS(MIN_vruntime));
	SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", "min_vruntime",
			SPLIT_NS(min_vruntime));
	SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", "max_vruntime",
			SPLIT_NS(max_vruntime));
	spread = max_vruntime - MIN_vruntime;
	SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", "spread",
			SPLIT_NS(spread));
	spread0 = min_vruntime - rq0_min_vruntime;
	SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", "spread0",
			SPLIT_NS(spread0));
	SEQ_printf(m, "  .%-30s: %d\n", "nr_spread_over",
			cfs_rq->nr_spread_over);
	SEQ_printf(m, "  .%-30s: %d\n", "nr_running", cfs_rq->nr_running);
	SEQ_printf(m, "  .%-30s: %ld\n", "load", cfs_rq->load.weight);
#ifdef CONFIG_SMP
	SEQ_printf(m, "  .%-30s: %lu\n", "load_avg",
			cfs_rq->avg.load_avg);
	SEQ_printf(m, "  .%-30s: %lu\n", "runnable_avg",
			cfs_rq->avg.runnable_avg);
	SEQ_printf(m, "  .%-30s: %lu\n", "util_avg",
			cfs_rq->avg.util_avg);
	SEQ_printf(m, "  .%-30s: %u\n", "util_est_enqueued",
			cfs_rq->avg.util_est.enqueued);
	SEQ_printf(m, "  .%-30s: %ld\n", "removed.load_avg",
			cfs_rq->removed.load_avg);
	SEQ_printf(m, "  .%-30s: %ld\n", "removed.util_avg",
			cfs_rq->removed.util_avg);
	SEQ_printf(m, "  .%-30s: %ld\n", "removed.runnable_avg",
			cfs_rq->removed.runnable_avg);
#ifdef CONFIG_FAIR_GROUP_SCHED
	SEQ_printf(m, "  .%-30s: %lu\n", "tg_load_avg_contrib",
			cfs_rq->tg_load_avg_contrib);
	SEQ_printf(m, "  .%-30s: %ld\n", "tg_load_avg",
			atomic_long_read(&cfs_rq->tg->load_avg));
#endif
#endif
#ifdef CONFIG_CFS_BANDWIDTH
	SEQ_printf(m, "  .%-30s: %d\n", "throttled",
			cfs_rq->throttled);
	SEQ_printf(m, "  .%-30s: %d\n", "throttle_count",
			cfs_rq->throttle_count);
#endif

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

#define P(x) \
	SEQ_printf(m, "  .%-30s: %Ld\n", #x, (long long)(rt_rq->x))
#define PU(x) \
	SEQ_printf(m, "  .%-30s: %lu\n", #x, (unsigned long)(rt_rq->x))
#define PN(x) \
	SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rt_rq->x))

	PU(rt_nr_running);
#ifdef CONFIG_SMP
	PU(rt_nr_migratory);
#endif
	P(rt_throttled);
	PN(rt_time);
	PN(rt_runtime);

#undef PN
#undef PU
#undef P
}

void print_dl_rq(struct seq_file *m, int cpu, struct dl_rq *dl_rq)
{
	struct dl_bw *dl_bw;

	SEQ_printf(m, "\n");
	SEQ_printf(m, "dl_rq[%d]:\n", cpu);

#define PU(x) \
	SEQ_printf(m, "  .%-30s: %lu\n", #x, (unsigned long)(dl_rq->x))

	PU(dl_nr_running);
#ifdef CONFIG_SMP
	PU(dl_nr_migratory);
	dl_bw = &cpu_rq(cpu)->rd->dl_bw;
#else
	dl_bw = &dl_rq->dl_bw;
#endif
	SEQ_printf(m, "  .%-30s: %lld\n", "dl_bw->bw", dl_bw->bw);
	SEQ_printf(m, "  .%-30s: %lld\n", "dl_bw->total_bw", dl_bw->total_bw);

#undef PU
}

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\n",
			   cpu, freq / 1000, (freq % 1000));
	}
#else
	SEQ_printf(m, "cpu#%d\n", cpu);
#endif

#define P(x)								\
do {									\
	if (sizeof(rq->x) == 4)						\
		SEQ_printf(m, "  .%-30s: %ld\n", #x, (long)(rq->x));	\
	else								\
		SEQ_printf(m, "  .%-30s: %Ld\n", #x, (long long)(rq->x));\
} while (0)

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

	P(nr_running);
	P(nr_switches);
	P(nr_load_updates);
	P(nr_uninterruptible);
	PN(next_balance);
	SEQ_printf(m, "  .%-30s: %ld\n", "curr->pid", (long)(task_pid_nr(rq->curr)));
	PN(clock);
	PN(clock_task);
#undef P
#undef PN

#ifdef CONFIG_SMP
#define P64(n) SEQ_printf(m, "  .%-30s: %Ld\n", #n, rq->n);
	P64(avg_idle);
	P64(max_idle_balance_cost);
#undef P64
#endif

#define P(n) SEQ_printf(m, "  .%-30s: %d\n", #n, schedstat_val(rq->n));
	if (schedstat_enabled()) {
		P(yld_count);
		P(sched_count);
		P(sched_goidle);
		P(ttwu_count);
		P(ttwu_local);
	}
#undef P

	spin_lock_irqsave(&sched_debug_lock, flags);
	print_cfs_stats(m, cpu);
	print_rt_stats(m, cpu);
	print_dl_stats(m, cpu);

	print_rq(m, rq, cpu);
	spin_unlock_irqrestore(&sched_debug_lock, flags);
	SEQ_printf(m, "\n");
}

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

static void sched_debug_header(struct seq_file *m)
{
	u64 ktime, sched_clk, cpu_clk;
	unsigned long flags;

	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: v0.11, %s %.*s\n",
		init_utsname()->release,
		(int)strcspn(init_utsname()->version, " "),
		init_utsname()->version);

#define P(x) \
	SEQ_printf(m, "%-40s: %Ld\n", #x, (long long)(x))
#define PN(x) \
	SEQ_printf(m, "%-40s: %Ld.%06ld\n", #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, "\n");
	SEQ_printf(m, "sysctl_sched\n");

#define P(x) \
	SEQ_printf(m, "  .%-40s: %Ld\n", #x, (long long)(x))
#define PN(x) \
	SEQ_printf(m, "  .%-40s: %Ld.%06ld\n", #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)\n",
		"sysctl_sched_tunable_scaling",
		sysctl_sched_tunable_scaling,
		sched_tunable_scaling_names[sysctl_sched_tunable_scaling]);
	SEQ_printf(m, "\n");
}

static int sched_debug_show(struct seq_file *m, void *v)
{
	int cpu = (unsigned long)(v - 2);

	if (cpu != -1)
		print_cpu(m, cpu);
	else
		sched_debug_header(m);

	return 0;
}

void sysrq_sched_debug_show(void)
{
	int cpu;

	sched_debug_header(NULL);
	for_each_online_cpu(cpu) {
		/*
		 * Need to reset softlockup watchdogs on all CPUs, because
		 * another CPU might be blocked waiting for us to process
		 * an IPI or stop_machine.
		 */
		touch_nmi_watchdog();
		touch_all_softlockup_watchdogs();
		print_cpu(NULL, cpu);
	}
}

/*
 * This itererator needs some explanation.
 * It returns 1 for the header position.
 * This means 2 is CPU 0.
 * In a hotplugged system some CPUs, including CPU 0, may be missing so we have
 * to use cpumask_* to iterate over the CPUs.
 */
static void *sched_debug_start(struct seq_file *file, loff_t *offset)
{
	unsigned long n = *offset;

	if (n == 0)
		return (void *) 1;

	n--;

	if (n > 0)
		n = cpumask_next(n - 1, cpu_online_mask);
	else
		n = cpumask_first(cpu_online_mask);

	*offset = n + 1;

	if (n < nr_cpu_ids)
		return (void *)(unsigned long)(n + 2);

	return NULL;
}

static void *sched_debug_next(struct seq_file *file, void *data, loff_t *offset)
{
	(*offset)++;
	return sched_debug_start(file, offset);
}

static void sched_debug_stop(struct seq_file *file, void *data)
{
}

static const struct seq_operations sched_debug_sops = {
	.start		= sched_debug_start,
	.next		= sched_debug_next,
	.stop		= sched_debug_stop,
	.show		= sched_debug_show,
};

static int __init init_sched_debug_procfs(void)
{
	if (!proc_create_seq("sched_debug", 0444, NULL, &sched_debug_sops))
		return -ENOMEM;
	return 0;
}

__initcall(init_sched_debug_procfs);

#define __PS(S, F) SEQ_printf(m, "%-45s:%21Ld\n", S, (long long)(F))
#define __P(F) __PS(#F, F)
#define   P(F) __PS(#F, p->F)
#define __PSN(S, F) SEQ_printf(m, "%-45s:%14Ld.%06ld\n", S, SPLIT_NS((long long)(F)))
#define __PN(F) __PSN(#F, F)
#define   PN(F) __PSN(#F, p->F)


#ifdef CONFIG_NUMA_BALANCING
void print_numa_stats(struct seq_file *m, int node, unsigned long tsf,
		unsigned long tpf, unsigned long gsf, unsigned long gpf)
{
	SEQ_printf(m, "numa_faults node=%d ", node);
	SEQ_printf(m, "task_private=%lu task_shared=%lu ", tpf, tsf);
	SEQ_printf(m, "group_private=%lu group_shared=%lu\n", gpf, gsf);
}
#endif


static void sched_show_numa(struct task_struct *p, struct seq_file *m)
{
#ifdef CONFIG_NUMA_BALANCING
	struct mempolicy *pol;

	if (p->mm)
		P(mm->numa_scan_seq);

	task_lock(p);
	pol = p->mempolicy;
	if (pol && !(pol->flags & MPOL_F_MORON))
		pol = NULL;
	mpol_get(pol);
	task_unlock(p);

	P(numa_pages_migrated);
	P(numa_preferred_nid);
	P(total_numa_faults);
	SEQ_printf(m, "current_node=%d, numa_group_id=%d\n",
			task_node(p), task_numa_group_id(p));
	show_numa_stats(p, m);
	mpol_put(pol);
#endif
}

void proc_sched_show_task(struct task_struct *p, struct pid_namespace *ns,
						  struct seq_file *m)
{
	unsigned long nr_switches;

	SEQ_printf(m, "%s (%d, #threads: %d)\n", p->comm, task_pid_nr_ns(p, ns),
						get_nr_threads(p));
	SEQ_printf(m,
		"---------------------------------------------------------"
		"----------\n");

#define P_SCHEDSTAT(F)  __PS(#F, schedstat_val(p->F))
#define PN_SCHEDSTAT(F) __PSN(#F, schedstat_val(p->F))

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

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

	P(se.nr_migrations);

	if (schedstat_enabled()) {
		u64 avg_atom, avg_per_cpu;

		PN_SCHEDSTAT(se.statistics.sum_sleep_runtime);
		PN_SCHEDSTAT(se.statistics.wait_start);
		PN_SCHEDSTAT(se.statistics.sleep_start);
		PN_SCHEDSTAT(se.statistics.block_start);
		PN_SCHEDSTAT(se.statistics.sleep_max);
		PN_SCHEDSTAT(se.statistics.block_max);
		PN_SCHEDSTAT(se.statistics.exec_max);
		PN_SCHEDSTAT(se.statistics.slice_max);
		PN_SCHEDSTAT(se.statistics.wait_max);
		PN_SCHEDSTAT(se.statistics.wait_sum);
		P_SCHEDSTAT(se.statistics.wait_count);
		PN_SCHEDSTAT(se.statistics.iowait_sum);
		P_SCHEDSTAT(se.statistics.iowait_count);
		P_SCHEDSTAT(se.statistics.nr_migrations_cold);
		P_SCHEDSTAT(se.statistics.nr_failed_migrations_affine);
		P_SCHEDSTAT(se.statistics.nr_failed_migrations_running);
		P_SCHEDSTAT(se.statistics.nr_failed_migrations_hot);
		P_SCHEDSTAT(se.statistics.nr_forced_migrations);
		P_SCHEDSTAT(se.statistics.nr_wakeups);
		P_SCHEDSTAT(se.statistics.nr_wakeups_sync);
		P_SCHEDSTAT(se.statistics.nr_wakeups_migrate);
		P_SCHEDSTAT(se.statistics.nr_wakeups_local);
		P_SCHEDSTAT(se.statistics.nr_wakeups_remote);
		P_SCHEDSTAT(se.statistics.nr_wakeups_affine);
		P_SCHEDSTAT(se.statistics.nr_wakeups_affine_attempts);
		P_SCHEDSTAT(se.statistics.nr_wakeups_passive);
		P_SCHEDSTAT(se.statistics.nr_wakeups_idle);

		avg_atom = p->se.sum_exec_runtime;
		if (nr_switches)
			avg_atom = div64_ul(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);
	}

	__P(nr_switches);
	__PS("nr_voluntary_switches", p->nvcsw);
	__PS("nr_involuntary_switches", p->nivcsw);

	P(se.load.weight);
#ifdef CONFIG_SMP
	P(se.avg.load_sum);
	P(se.avg.runnable_sum);
	P(se.avg.util_sum);
	P(se.avg.load_avg);
	P(se.avg.runnable_avg);
	P(se.avg.util_avg);
	P(se.avg.last_update_time);
	P(se.avg.util_est.ewma);
	P(se.avg.util_est.enqueued);
#endif
#ifdef CONFIG_UCLAMP_TASK
	__PS("uclamp.min", p->uclamp[UCLAMP_MIN].value);
	__PS("uclamp.max", p->uclamp[UCLAMP_MAX].value);
	__PS("effective uclamp.min", uclamp_eff_value(p, UCLAMP_MIN));
	__PS("effective uclamp.max", uclamp_eff_value(p, UCLAMP_MAX));
#endif
	P(policy);
	P(prio);
	if (task_has_dl_policy(p)) {
		P(dl.runtime);
		P(dl.deadline);
	}
#undef PN_SCHEDSTAT
#undef P_SCHEDSTAT

	{
		unsigned int this_cpu = raw_smp_processor_id();
		u64 t0, t1;

		t0 = cpu_clock(this_cpu);
		t1 = cpu_clock(this_cpu);
		__PS("clock-delta", t1-t0);
	}

	sched_show_numa(p, m);
}

void proc_sched_set_task(struct task_struct *p)
{
#ifdef CONFIG_SCHEDSTATS
	memset(&p->se.statistics, 0, sizeof(p->se.statistics));
#endif
}