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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
029632fb PZ |
2 | |
3 | #include <linux/slab.h> | |
4 | #include <linux/fs.h> | |
5 | #include <linux/seq_file.h> | |
6 | #include <linux/proc_fs.h> | |
7 | ||
8 | #include "sched.h" | |
9 | ||
10 | /* | |
11 | * bump this up when changing the output format or the meaning of an existing | |
12 | * format, so that tools can adapt (or abort) | |
13 | */ | |
14 | #define SCHEDSTAT_VERSION 15 | |
15 | ||
16 | static int show_schedstat(struct seq_file *seq, void *v) | |
17 | { | |
18 | int cpu; | |
029632fb | 19 | |
cb152ff2 NZ |
20 | if (v == (void *)1) { |
21 | seq_printf(seq, "version %d\n", SCHEDSTAT_VERSION); | |
22 | seq_printf(seq, "timestamp %lu\n", jiffies); | |
23 | } else { | |
24 | struct rq *rq; | |
029632fb PZ |
25 | #ifdef CONFIG_SMP |
26 | struct sched_domain *sd; | |
27 | int dcount = 0; | |
28 | #endif | |
cb152ff2 NZ |
29 | cpu = (unsigned long)(v - 2); |
30 | rq = cpu_rq(cpu); | |
029632fb PZ |
31 | |
32 | /* runqueue-specific stats */ | |
33 | seq_printf(seq, | |
30fd049a | 34 | "cpu%d %u 0 %u %u %u %u %llu %llu %lu", |
029632fb | 35 | cpu, rq->yld_count, |
30fd049a | 36 | rq->sched_count, rq->sched_goidle, |
029632fb PZ |
37 | rq->ttwu_count, rq->ttwu_local, |
38 | rq->rq_cpu_time, | |
39 | rq->rq_sched_info.run_delay, rq->rq_sched_info.pcount); | |
40 | ||
41 | seq_printf(seq, "\n"); | |
42 | ||
43 | #ifdef CONFIG_SMP | |
44 | /* domain-specific stats */ | |
45 | rcu_read_lock(); | |
46 | for_each_domain(cpu, sd) { | |
47 | enum cpu_idle_type itype; | |
48 | ||
333470ee TH |
49 | seq_printf(seq, "domain%d %*pb", dcount++, |
50 | cpumask_pr_args(sched_domain_span(sd))); | |
029632fb PZ |
51 | for (itype = CPU_IDLE; itype < CPU_MAX_IDLE_TYPES; |
52 | itype++) { | |
53 | seq_printf(seq, " %u %u %u %u %u %u %u %u", | |
54 | sd->lb_count[itype], | |
55 | sd->lb_balanced[itype], | |
56 | sd->lb_failed[itype], | |
57 | sd->lb_imbalance[itype], | |
58 | sd->lb_gained[itype], | |
59 | sd->lb_hot_gained[itype], | |
60 | sd->lb_nobusyq[itype], | |
61 | sd->lb_nobusyg[itype]); | |
62 | } | |
63 | seq_printf(seq, | |
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); | |
70 | } | |
71 | rcu_read_unlock(); | |
72 | #endif | |
73 | } | |
029632fb PZ |
74 | return 0; |
75 | } | |
76 | ||
cb152ff2 NZ |
77 | /* |
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. | |
83 | */ | |
84 | static void *schedstat_start(struct seq_file *file, loff_t *offset) | |
029632fb | 85 | { |
cb152ff2 | 86 | unsigned long n = *offset; |
029632fb | 87 | |
cb152ff2 NZ |
88 | if (n == 0) |
89 | return (void *) 1; | |
90 | ||
91 | n--; | |
92 | ||
93 | if (n > 0) | |
94 | n = cpumask_next(n - 1, cpu_online_mask); | |
95 | else | |
96 | n = cpumask_first(cpu_online_mask); | |
97 | ||
98 | *offset = n + 1; | |
99 | ||
100 | if (n < nr_cpu_ids) | |
101 | return (void *)(unsigned long)(n + 2); | |
102 | return NULL; | |
103 | } | |
104 | ||
105 | static void *schedstat_next(struct seq_file *file, void *data, loff_t *offset) | |
106 | { | |
107 | (*offset)++; | |
108 | return schedstat_start(file, offset); | |
109 | } | |
110 | ||
111 | static void schedstat_stop(struct seq_file *file, void *data) | |
112 | { | |
113 | } | |
114 | ||
115 | static const struct seq_operations schedstat_sops = { | |
116 | .start = schedstat_start, | |
117 | .next = schedstat_next, | |
118 | .stop = schedstat_stop, | |
119 | .show = show_schedstat, | |
120 | }; | |
121 | ||
122 | static int schedstat_open(struct inode *inode, struct file *file) | |
123 | { | |
124 | return seq_open(file, &schedstat_sops); | |
029632fb PZ |
125 | } |
126 | ||
127 | static const struct file_operations proc_schedstat_operations = { | |
128 | .open = schedstat_open, | |
129 | .read = seq_read, | |
130 | .llseek = seq_lseek, | |
8e0bcc72 | 131 | .release = seq_release, |
029632fb PZ |
132 | }; |
133 | ||
134 | static int __init proc_schedstat_init(void) | |
135 | { | |
136 | proc_create("schedstat", 0, NULL, &proc_schedstat_operations); | |
137 | return 0; | |
138 | } | |
c96d6660 | 139 | subsys_initcall(proc_schedstat_init); |