// SPDX-License-Identifier: GPL-2.0
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/*
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* /proc/schedstat implementation
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*/
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#include "sched.h"
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/*
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* Current schedstat API version.
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*
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* Bump this up when changing the output format or the meaning of an existing
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* format, so that tools can adapt (or abort)
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*/
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#define SCHEDSTAT_VERSION 15
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static int show_schedstat(struct seq_file *seq, void *v)
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{
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int cpu;
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if (v == (void *)1) {
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seq_printf(seq, "version %d\n", SCHEDSTAT_VERSION);
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seq_printf(seq, "timestamp %lu\n", jiffies);
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} else {
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struct rq *rq;
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#ifdef CONFIG_SMP
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struct sched_domain *sd;
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int dcount = 0;
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#endif
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cpu = (unsigned long)(v - 2);
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rq = cpu_rq(cpu);
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/* runqueue-specific stats */
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seq_printf(seq,
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"cpu%d %u 0 %u %u %u %u %llu %llu %lu",
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cpu, rq->yld_count,
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rq->sched_count, rq->sched_goidle,
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rq->ttwu_count, rq->ttwu_local,
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rq->rq_cpu_time,
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rq->rq_sched_info.run_delay, rq->rq_sched_info.pcount);
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seq_printf(seq, "\n");
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#ifdef CONFIG_SMP
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/* domain-specific stats */
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rcu_read_lock();
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for_each_domain(cpu, sd) {
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enum cpu_idle_type itype;
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seq_printf(seq, "domain%d %*pb", dcount++,
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cpumask_pr_args(sched_domain_span(sd)));
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for (itype = CPU_IDLE; itype < CPU_MAX_IDLE_TYPES;
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itype++) {
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seq_printf(seq, " %u %u %u %u %u %u %u %u",
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sd->lb_count[itype],
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sd->lb_balanced[itype],
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sd->lb_failed[itype],
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sd->lb_imbalance[itype],
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sd->lb_gained[itype],
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sd->lb_hot_gained[itype],
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sd->lb_nobusyq[itype],
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sd->lb_nobusyg[itype]);
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}
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seq_printf(seq,
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" %u %u %u %u %u %u %u %u %u %u %u %u\n",
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sd->alb_count, sd->alb_failed, sd->alb_pushed,
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sd->sbe_count, sd->sbe_balanced, sd->sbe_pushed,
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sd->sbf_count, sd->sbf_balanced, sd->sbf_pushed,
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sd->ttwu_wake_remote, sd->ttwu_move_affine,
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sd->ttwu_move_balance);
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}
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rcu_read_unlock();
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#endif
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}
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return 0;
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}
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/*
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* This itererator needs some explanation.
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* It returns 1 for the header position.
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* This means 2 is cpu 0.
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* In a hotplugged system some CPUs, including cpu 0, may be missing so we have
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* to use cpumask_* to iterate over the CPUs.
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*/
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static void *schedstat_start(struct seq_file *file, loff_t *offset)
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{
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unsigned long n = *offset;
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if (n == 0)
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return (void *) 1;
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n--;
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if (n > 0)
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n = cpumask_next(n - 1, cpu_online_mask);
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else
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n = cpumask_first(cpu_online_mask);
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*offset = n + 1;
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if (n < nr_cpu_ids)
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return (void *)(unsigned long)(n + 2);
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return NULL;
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}
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static void *schedstat_next(struct seq_file *file, void *data, loff_t *offset)
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{
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(*offset)++;
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return schedstat_start(file, offset);
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}
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static void schedstat_stop(struct seq_file *file, void *data)
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{
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}
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static const struct seq_operations schedstat_sops = {
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.start = schedstat_start,
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.next = schedstat_next,
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.stop = schedstat_stop,
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.show = show_schedstat,
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};
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static int __init proc_schedstat_init(void)
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{
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proc_create_seq("schedstat", 0, NULL, &schedstat_sops);
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return 0;
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}
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subsys_initcall(proc_schedstat_init);
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