Commit | Line | Data |
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029632fb PZ |
1 | |
2 | #include <linux/slab.h> | |
3 | #include <linux/fs.h> | |
4 | #include <linux/seq_file.h> | |
5 | #include <linux/proc_fs.h> | |
6 | ||
7 | #include "sched.h" | |
8 | ||
9 | /* | |
10 | * bump this up when changing the output format or the meaning of an existing | |
11 | * format, so that tools can adapt (or abort) | |
12 | */ | |
13 | #define SCHEDSTAT_VERSION 15 | |
14 | ||
15 | static int show_schedstat(struct seq_file *seq, void *v) | |
16 | { | |
17 | int cpu; | |
18 | int mask_len = DIV_ROUND_UP(NR_CPUS, 32) * 9; | |
19 | char *mask_str = kmalloc(mask_len, GFP_KERNEL); | |
20 | ||
21 | if (mask_str == NULL) | |
22 | return -ENOMEM; | |
23 | ||
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); | |
28 | #ifdef CONFIG_SMP | |
29 | struct sched_domain *sd; | |
30 | int dcount = 0; | |
31 | #endif | |
32 | ||
33 | /* runqueue-specific stats */ | |
34 | seq_printf(seq, | |
30fd049a | 35 | "cpu%d %u 0 %u %u %u %u %llu %llu %lu", |
029632fb | 36 | cpu, rq->yld_count, |
30fd049a | 37 | rq->sched_count, rq->sched_goidle, |
029632fb PZ |
38 | rq->ttwu_count, rq->ttwu_local, |
39 | rq->rq_cpu_time, | |
40 | rq->rq_sched_info.run_delay, rq->rq_sched_info.pcount); | |
41 | ||
42 | seq_printf(seq, "\n"); | |
43 | ||
44 | #ifdef CONFIG_SMP | |
45 | /* domain-specific stats */ | |
46 | rcu_read_lock(); | |
47 | for_each_domain(cpu, sd) { | |
48 | enum cpu_idle_type itype; | |
49 | ||
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; | |
54 | itype++) { | |
55 | seq_printf(seq, " %u %u %u %u %u %u %u %u", | |
56 | sd->lb_count[itype], | |
57 | sd->lb_balanced[itype], | |
58 | sd->lb_failed[itype], | |
59 | sd->lb_imbalance[itype], | |
60 | sd->lb_gained[itype], | |
61 | sd->lb_hot_gained[itype], | |
62 | sd->lb_nobusyq[itype], | |
63 | sd->lb_nobusyg[itype]); | |
64 | } | |
65 | seq_printf(seq, | |
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); | |
72 | } | |
73 | rcu_read_unlock(); | |
74 | #endif | |
75 | } | |
76 | kfree(mask_str); | |
77 | return 0; | |
78 | } | |
79 | ||
80 | static int schedstat_open(struct inode *inode, struct file *file) | |
81 | { | |
82 | unsigned int size = PAGE_SIZE * (1 + num_online_cpus() / 32); | |
83 | char *buf = kmalloc(size, GFP_KERNEL); | |
84 | struct seq_file *m; | |
85 | int res; | |
86 | ||
87 | if (!buf) | |
88 | return -ENOMEM; | |
89 | res = single_open(file, show_schedstat, NULL); | |
90 | if (!res) { | |
91 | m = file->private_data; | |
92 | m->buf = buf; | |
93 | m->size = size; | |
94 | } else | |
95 | kfree(buf); | |
96 | return res; | |
97 | } | |
98 | ||
99 | static const struct file_operations proc_schedstat_operations = { | |
100 | .open = schedstat_open, | |
101 | .read = seq_read, | |
102 | .llseek = seq_lseek, | |
103 | .release = single_release, | |
104 | }; | |
105 | ||
106 | static int __init proc_schedstat_init(void) | |
107 | { | |
108 | proc_create("schedstat", 0, NULL, &proc_schedstat_operations); | |
109 | return 0; | |
110 | } | |
111 | module_init(proc_schedstat_init); |