Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
325ea10c IM |
2 | /* |
3 | * /proc/schedstat implementation | |
4 | */ | |
029632fb PZ |
5 | #include "sched.h" |
6 | ||
7 | /* | |
325ea10c IM |
8 | * Current schedstat API version. |
9 | * | |
10 | * Bump this up when changing the output format or the meaning of an existing | |
029632fb PZ |
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; | |
029632fb | 18 | |
cb152ff2 NZ |
19 | if (v == (void *)1) { |
20 | seq_printf(seq, "version %d\n", SCHEDSTAT_VERSION); | |
21 | seq_printf(seq, "timestamp %lu\n", jiffies); | |
22 | } else { | |
23 | struct rq *rq; | |
029632fb PZ |
24 | #ifdef CONFIG_SMP |
25 | struct sched_domain *sd; | |
26 | int dcount = 0; | |
27 | #endif | |
cb152ff2 NZ |
28 | cpu = (unsigned long)(v - 2); |
29 | rq = cpu_rq(cpu); | |
029632fb PZ |
30 | |
31 | /* runqueue-specific stats */ | |
32 | seq_printf(seq, | |
30fd049a | 33 | "cpu%d %u 0 %u %u %u %u %llu %llu %lu", |
029632fb | 34 | cpu, rq->yld_count, |
30fd049a | 35 | rq->sched_count, rq->sched_goidle, |
029632fb PZ |
36 | rq->ttwu_count, rq->ttwu_local, |
37 | rq->rq_cpu_time, | |
38 | rq->rq_sched_info.run_delay, rq->rq_sched_info.pcount); | |
39 | ||
40 | seq_printf(seq, "\n"); | |
41 | ||
42 | #ifdef CONFIG_SMP | |
43 | /* domain-specific stats */ | |
44 | rcu_read_lock(); | |
45 | for_each_domain(cpu, sd) { | |
46 | enum cpu_idle_type itype; | |
47 | ||
333470ee TH |
48 | seq_printf(seq, "domain%d %*pb", dcount++, |
49 | cpumask_pr_args(sched_domain_span(sd))); | |
029632fb PZ |
50 | for (itype = CPU_IDLE; itype < CPU_MAX_IDLE_TYPES; |
51 | itype++) { | |
52 | seq_printf(seq, " %u %u %u %u %u %u %u %u", | |
53 | sd->lb_count[itype], | |
54 | sd->lb_balanced[itype], | |
55 | sd->lb_failed[itype], | |
56 | sd->lb_imbalance[itype], | |
57 | sd->lb_gained[itype], | |
58 | sd->lb_hot_gained[itype], | |
59 | sd->lb_nobusyq[itype], | |
60 | sd->lb_nobusyg[itype]); | |
61 | } | |
62 | seq_printf(seq, | |
63 | " %u %u %u %u %u %u %u %u %u %u %u %u\n", | |
64 | sd->alb_count, sd->alb_failed, sd->alb_pushed, | |
65 | sd->sbe_count, sd->sbe_balanced, sd->sbe_pushed, | |
66 | sd->sbf_count, sd->sbf_balanced, sd->sbf_pushed, | |
67 | sd->ttwu_wake_remote, sd->ttwu_move_affine, | |
68 | sd->ttwu_move_balance); | |
69 | } | |
70 | rcu_read_unlock(); | |
71 | #endif | |
72 | } | |
029632fb PZ |
73 | return 0; |
74 | } | |
75 | ||
cb152ff2 | 76 | /* |
3b03706f | 77 | * This iterator needs some explanation. |
cb152ff2 NZ |
78 | * It returns 1 for the header position. |
79 | * This means 2 is cpu 0. | |
97fb7a0a IM |
80 | * In a hotplugged system some CPUs, including cpu 0, may be missing so we have |
81 | * to use cpumask_* to iterate over the CPUs. | |
cb152ff2 NZ |
82 | */ |
83 | static void *schedstat_start(struct seq_file *file, loff_t *offset) | |
029632fb | 84 | { |
cb152ff2 | 85 | unsigned long n = *offset; |
029632fb | 86 | |
cb152ff2 NZ |
87 | if (n == 0) |
88 | return (void *) 1; | |
89 | ||
90 | n--; | |
91 | ||
92 | if (n > 0) | |
93 | n = cpumask_next(n - 1, cpu_online_mask); | |
94 | else | |
95 | n = cpumask_first(cpu_online_mask); | |
96 | ||
97 | *offset = n + 1; | |
98 | ||
99 | if (n < nr_cpu_ids) | |
100 | return (void *)(unsigned long)(n + 2); | |
97fb7a0a | 101 | |
cb152ff2 NZ |
102 | return NULL; |
103 | } | |
104 | ||
105 | static void *schedstat_next(struct seq_file *file, void *data, loff_t *offset) | |
106 | { | |
107 | (*offset)++; | |
97fb7a0a | 108 | |
cb152ff2 NZ |
109 | return schedstat_start(file, offset); |
110 | } | |
111 | ||
112 | static void schedstat_stop(struct seq_file *file, void *data) | |
113 | { | |
114 | } | |
115 | ||
116 | static const struct seq_operations schedstat_sops = { | |
117 | .start = schedstat_start, | |
118 | .next = schedstat_next, | |
119 | .stop = schedstat_stop, | |
120 | .show = show_schedstat, | |
121 | }; | |
122 | ||
029632fb PZ |
123 | static int __init proc_schedstat_init(void) |
124 | { | |
fddda2b7 | 125 | proc_create_seq("schedstat", 0, NULL, &schedstat_sops); |
029632fb PZ |
126 | return 0; |
127 | } | |
c96d6660 | 128 | subsys_initcall(proc_schedstat_init); |