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// SPDX-License-Identifier: GPL-2.0
/*
* /proc/schedstat implementation
*/
#include "sched.h"
/*
* Current schedstat API version.
*
* Bump this up when changing the output format or the meaning of an existing
* format, so that tools can adapt (or abort)
*/
#define SCHEDSTAT_VERSION 15
static int show_schedstat(struct seq_file *seq, void *v)
{
int cpu;
if (v == (void *)1) {
seq_printf(seq, "version %d\n", SCHEDSTAT_VERSION);
seq_printf(seq, "timestamp %lu\n", jiffies);
} else {
struct rq *rq;
#ifdef CONFIG_SMP
struct sched_domain *sd;
int dcount = 0;
#endif
cpu = (unsigned long)(v - 2);
rq = cpu_rq(cpu);
/* runqueue-specific stats */
seq_printf(seq,
"cpu%d %u 0 %u %u %u %u %llu %llu %lu",
cpu, rq->yld_count,
rq->sched_count, rq->sched_goidle,
rq->ttwu_count, rq->ttwu_local,
rq->rq_cpu_time,
rq->rq_sched_info.run_delay, rq->rq_sched_info.pcount);
seq_printf(seq, "\n");
#ifdef CONFIG_SMP
/* domain-specific stats */
rcu_read_lock();
for_each_domain(cpu, sd) {
enum cpu_idle_type itype;
seq_printf(seq, "domain%d %*pb", dcount++,
cpumask_pr_args(sched_domain_span(sd)));
for (itype = CPU_IDLE; itype < CPU_MAX_IDLE_TYPES;
itype++) {
seq_printf(seq, " %u %u %u %u %u %u %u %u",
sd->lb_count[itype],
sd->lb_balanced[itype],
sd->lb_failed[itype],
sd->lb_imbalance[itype],
sd->lb_gained[itype],
sd->lb_hot_gained[itype],
sd->lb_nobusyq[itype],
sd->lb_nobusyg[itype]);
}
seq_printf(seq,
" %u %u %u %u %u %u %u %u %u %u %u %u\n",
sd->alb_count, sd->alb_failed, sd->alb_pushed,
sd->sbe_count, sd->sbe_balanced, sd->sbe_pushed,
sd->sbf_count, sd->sbf_balanced, sd->sbf_pushed,
sd->ttwu_wake_remote, sd->ttwu_move_affine,
sd->ttwu_move_balance);
}
rcu_read_unlock();
#endif
}
return 0;
}
/*
* 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 *schedstat_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 *schedstat_next(struct seq_file *file, void *data, loff_t *offset)
{
(*offset)++;
return schedstat_start(file, offset);
}
static void schedstat_stop(struct seq_file *file, void *data)
{
}
static const struct seq_operations schedstat_sops = {
.start = schedstat_start,
.next = schedstat_next,
.stop = schedstat_stop,
.show = show_schedstat,
};
static int schedstat_open(struct inode *inode, struct file *file)
{
return seq_open(file, &schedstat_sops);
}
static const struct file_operations proc_schedstat_operations = {
.open = schedstat_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
};
static int __init proc_schedstat_init(void)
{
proc_create("schedstat", 0, NULL, &proc_schedstat_operations);
return 0;
}
subsys_initcall(proc_schedstat_init);
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