2 #include <linux/slab.h>
4 #include <linux/seq_file.h>
5 #include <linux/proc_fs.h>
10 * bump this up when changing the output format or the meaning of an existing
11 * format, so that tools can adapt (or abort)
13 #define SCHEDSTAT_VERSION 15
15 static int show_schedstat(struct seq_file *seq, void *v)
18 int mask_len = DIV_ROUND_UP(NR_CPUS, 32) * 9;
19 char *mask_str = kmalloc(mask_len, GFP_KERNEL);
24 seq_printf(seq, "version %d\n", SCHEDSTAT_VERSION);
25 seq_printf(seq, "timestamp %lu\n", jiffies);
26 for_each_online_cpu(cpu) {
27 struct rq *rq = cpu_rq(cpu);
29 struct sched_domain *sd;
33 /* runqueue-specific stats */
35 "cpu%d %u 0 %u %u %u %u %llu %llu %lu",
37 rq->sched_count, rq->sched_goidle,
38 rq->ttwu_count, rq->ttwu_local,
40 rq->rq_sched_info.run_delay, rq->rq_sched_info.pcount);
42 seq_printf(seq, "\n");
45 /* domain-specific stats */
47 for_each_domain(cpu, sd) {
48 enum cpu_idle_type itype;
50 cpumask_scnprintf(mask_str, mask_len,
51 sched_domain_span(sd));
52 seq_printf(seq, "domain%d %s", dcount++, mask_str);
53 for (itype = CPU_IDLE; itype < CPU_MAX_IDLE_TYPES;
55 seq_printf(seq, " %u %u %u %u %u %u %u %u",
57 sd->lb_balanced[itype],
59 sd->lb_imbalance[itype],
61 sd->lb_hot_gained[itype],
62 sd->lb_nobusyq[itype],
63 sd->lb_nobusyg[itype]);
66 " %u %u %u %u %u %u %u %u %u %u %u %u\n",
67 sd->alb_count, sd->alb_failed, sd->alb_pushed,
68 sd->sbe_count, sd->sbe_balanced, sd->sbe_pushed,
69 sd->sbf_count, sd->sbf_balanced, sd->sbf_pushed,
70 sd->ttwu_wake_remote, sd->ttwu_move_affine,
71 sd->ttwu_move_balance);
80 static int schedstat_open(struct inode *inode, struct file *file)
82 unsigned int size = PAGE_SIZE * (1 + num_online_cpus() / 32);
83 char *buf = kmalloc(size, GFP_KERNEL);
89 res = single_open(file, show_schedstat, NULL);
91 m = file->private_data;
99 static const struct file_operations proc_schedstat_operations = {
100 .open = schedstat_open,
103 .release = single_release,
106 static int __init proc_schedstat_init(void)
108 proc_create("schedstat", 0, NULL, &proc_schedstat_operations);
111 module_init(proc_schedstat_init);