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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221// SPDX-License-Identifier: GPL-2.0/* * /proc/schedstat implementation */#include "sched.h"
void __update_stats_wait_start(struct rq *rq, struct task_struct *p, struct sched_statistics *stats){ u64 wait_start, prev_wait_start;
wait_start = rq_clock(rq); prev_wait_start = schedstat_val(stats->wait_start);
if (p && likely(wait_start > prev_wait_start)) wait_start -= prev_wait_start;
__schedstat_set(stats->wait_start, wait_start);}
void __update_stats_wait_end(struct rq *rq, struct task_struct *p, struct sched_statistics *stats){ u64 delta = rq_clock(rq) - schedstat_val(stats->wait_start);
if (p) { if (task_on_rq_migrating(p)) { /* * Preserve migrating task's wait time so wait_start * time stamp can be adjusted to accumulate wait time * prior to migration. */ __schedstat_set(stats->wait_start, delta);
return; }
trace_sched_stat_wait(p, delta); }
__schedstat_set(stats->wait_max, max(schedstat_val(stats->wait_max), delta)); __schedstat_inc(stats->wait_count); __schedstat_add(stats->wait_sum, delta); __schedstat_set(stats->wait_start, 0);}
void __update_stats_enqueue_sleeper(struct rq *rq, struct task_struct *p, struct sched_statistics *stats){ u64 sleep_start, block_start;
sleep_start = schedstat_val(stats->sleep_start); block_start = schedstat_val(stats->block_start);
if (sleep_start) { u64 delta = rq_clock(rq) - sleep_start;
if ((s64)delta < 0) delta = 0;
if (unlikely(delta > schedstat_val(stats->sleep_max))) __schedstat_set(stats->sleep_max, delta);
__schedstat_set(stats->sleep_start, 0); __schedstat_add(stats->sum_sleep_runtime, delta);
if (p) { account_scheduler_latency(p, delta >> 10, 1); trace_sched_stat_sleep(p, delta); } }
if (block_start) { u64 delta = rq_clock(rq) - block_start;
if ((s64)delta < 0) delta = 0;
if (unlikely(delta > schedstat_val(stats->block_max))) __schedstat_set(stats->block_max, delta);
__schedstat_set(stats->block_start, 0); __schedstat_add(stats->sum_sleep_runtime, delta); __schedstat_add(stats->sum_block_runtime, delta);
if (p) { if (p->in_iowait) { __schedstat_add(stats->iowait_sum, delta); __schedstat_inc(stats->iowait_count); trace_sched_stat_iowait(p, delta); }
trace_sched_stat_blocked(p, delta);
account_scheduler_latency(p, delta >> 10, 0); } }}
/* * 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 17
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; struct sched_domain *sd; int dcount = 0; 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");
/* domain-specific stats */ rcu_read_lock(); for_each_domain(cpu, sd) { enum cpu_idle_type itype;
seq_printf(seq, "domain%d %s %*pb", dcount++, sd->name, cpumask_pr_args(sched_domain_span(sd))); for (itype = 0; itype < CPU_MAX_IDLE_TYPES; itype++) { seq_printf(seq, " %u %u %u %u %u %u %u %u %u %u %u", sd->lb_count[itype], sd->lb_balanced[itype], sd->lb_failed[itype], sd->lb_imbalance_load[itype], sd->lb_imbalance_util[itype], sd->lb_imbalance_task[itype], sd->lb_imbalance_misfit[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(); } return 0;}
/* * This iterator 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);