1 // SPDX-License-Identifier: GPL-2.0
3 #include <linux/slab.h>
5 #include <linux/seq_file.h>
6 #include <linux/proc_fs.h>
11 * bump this up when changing the output format or the meaning of an existing
12 * format, so that tools can adapt (or abort)
14 #define SCHEDSTAT_VERSION 15
16 static int show_schedstat(struct seq_file *seq, void *v)
21 seq_printf(seq, "version %d\n", SCHEDSTAT_VERSION);
22 seq_printf(seq, "timestamp %lu\n", jiffies);
26 struct sched_domain *sd;
29 cpu = (unsigned long)(v - 2);
32 /* runqueue-specific stats */
34 "cpu%d %u 0 %u %u %u %u %llu %llu %lu",
36 rq->sched_count, rq->sched_goidle,
37 rq->ttwu_count, rq->ttwu_local,
39 rq->rq_sched_info.run_delay, rq->rq_sched_info.pcount);
41 seq_printf(seq, "\n");
44 /* domain-specific stats */
46 for_each_domain(cpu, sd) {
47 enum cpu_idle_type itype;
49 seq_printf(seq, "domain%d %*pb", dcount++,
50 cpumask_pr_args(sched_domain_span(sd)));
51 for (itype = CPU_IDLE; itype < CPU_MAX_IDLE_TYPES;
53 seq_printf(seq, " %u %u %u %u %u %u %u %u",
55 sd->lb_balanced[itype],
57 sd->lb_imbalance[itype],
59 sd->lb_hot_gained[itype],
60 sd->lb_nobusyq[itype],
61 sd->lb_nobusyg[itype]);
64 " %u %u %u %u %u %u %u %u %u %u %u %u\n",
65 sd->alb_count, sd->alb_failed, sd->alb_pushed,
66 sd->sbe_count, sd->sbe_balanced, sd->sbe_pushed,
67 sd->sbf_count, sd->sbf_balanced, sd->sbf_pushed,
68 sd->ttwu_wake_remote, sd->ttwu_move_affine,
69 sd->ttwu_move_balance);
78 * This itererator needs some explanation.
79 * It returns 1 for the header position.
80 * This means 2 is cpu 0.
81 * In a hotplugged system some cpus, including cpu 0, may be missing so we have
82 * to use cpumask_* to iterate over the cpus.
84 static void *schedstat_start(struct seq_file *file, loff_t *offset)
86 unsigned long n = *offset;
94 n = cpumask_next(n - 1, cpu_online_mask);
96 n = cpumask_first(cpu_online_mask);
101 return (void *)(unsigned long)(n + 2);
105 static void *schedstat_next(struct seq_file *file, void *data, loff_t *offset)
108 return schedstat_start(file, offset);
111 static void schedstat_stop(struct seq_file *file, void *data)
115 static const struct seq_operations schedstat_sops = {
116 .start = schedstat_start,
117 .next = schedstat_next,
118 .stop = schedstat_stop,
119 .show = show_schedstat,
122 static int schedstat_open(struct inode *inode, struct file *file)
124 return seq_open(file, &schedstat_sops);
127 static const struct file_operations proc_schedstat_operations = {
128 .open = schedstat_open,
131 .release = seq_release,
134 static int __init proc_schedstat_init(void)
136 proc_create("schedstat", 0, NULL, &proc_schedstat_operations);
139 subsys_initcall(proc_schedstat_init);