^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * /proc/schedstat implementation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) #include "sched.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Current schedstat API version.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * Bump this up when changing the output format or the meaning of an existing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * format, so that tools can adapt (or abort)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #define SCHEDSTAT_VERSION 15
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) static int show_schedstat(struct seq_file *seq, void *v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) int cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) if (v == (void *)1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) seq_printf(seq, "version %d\n", SCHEDSTAT_VERSION);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) seq_printf(seq, "timestamp %lu\n", jiffies);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) struct rq *rq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #ifdef CONFIG_SMP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) struct sched_domain *sd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) int dcount = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) cpu = (unsigned long)(v - 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) rq = cpu_rq(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) /* runqueue-specific stats */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) seq_printf(seq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) "cpu%d %u 0 %u %u %u %u %llu %llu %lu",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) cpu, rq->yld_count,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) rq->sched_count, rq->sched_goidle,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) rq->ttwu_count, rq->ttwu_local,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) rq->rq_cpu_time,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) rq->rq_sched_info.run_delay, rq->rq_sched_info.pcount);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) seq_printf(seq, "\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) #ifdef CONFIG_SMP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) /* domain-specific stats */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) for_each_domain(cpu, sd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) enum cpu_idle_type itype;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) seq_printf(seq, "domain%d %*pb", dcount++,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) cpumask_pr_args(sched_domain_span(sd)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) for (itype = CPU_IDLE; itype < CPU_MAX_IDLE_TYPES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) itype++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) seq_printf(seq, " %u %u %u %u %u %u %u %u",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) sd->lb_count[itype],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) sd->lb_balanced[itype],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) sd->lb_failed[itype],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) sd->lb_imbalance[itype],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) sd->lb_gained[itype],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) sd->lb_hot_gained[itype],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) sd->lb_nobusyq[itype],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) sd->lb_nobusyg[itype]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) seq_printf(seq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) " %u %u %u %u %u %u %u %u %u %u %u %u\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) sd->alb_count, sd->alb_failed, sd->alb_pushed,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) sd->sbe_count, sd->sbe_balanced, sd->sbe_pushed,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) sd->sbf_count, sd->sbf_balanced, sd->sbf_pushed,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) sd->ttwu_wake_remote, sd->ttwu_move_affine,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) sd->ttwu_move_balance);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) * This itererator needs some explanation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) * It returns 1 for the header position.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) * This means 2 is cpu 0.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) * In a hotplugged system some CPUs, including cpu 0, may be missing so we have
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) * to use cpumask_* to iterate over the CPUs.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) static void *schedstat_start(struct seq_file *file, loff_t *offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) unsigned long n = *offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) if (n == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) return (void *) 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) n--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) if (n > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) n = cpumask_next(n - 1, cpu_online_mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) n = cpumask_first(cpu_online_mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) *offset = n + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) if (n < nr_cpu_ids)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) return (void *)(unsigned long)(n + 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) static void *schedstat_next(struct seq_file *file, void *data, loff_t *offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) (*offset)++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) return schedstat_start(file, offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) static void schedstat_stop(struct seq_file *file, void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) static const struct seq_operations schedstat_sops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) .start = schedstat_start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) .next = schedstat_next,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) .stop = schedstat_stop,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) .show = show_schedstat,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) static int __init proc_schedstat_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) proc_create_seq("schedstat", 0, NULL, &schedstat_sops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) subsys_initcall(proc_schedstat_init);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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