mirror of https://gitee.com/openkylin/linux.git
129 lines
2.9 KiB
C
129 lines
2.9 KiB
C
// 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 __init proc_schedstat_init(void)
|
|
{
|
|
proc_create_seq("schedstat", 0, NULL, &schedstat_sops);
|
|
return 0;
|
|
}
|
|
subsys_initcall(proc_schedstat_init);
|