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128 lines
2.9 KiB
128 lines
2.9 KiB
// 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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