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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 | ||
cb152ff2 NZ |
24 | if (v == (void *)1) { |
25 | seq_printf(seq, "version %d\n", SCHEDSTAT_VERSION); | |
26 | seq_printf(seq, "timestamp %lu\n", jiffies); | |
27 | } else { | |
28 | struct rq *rq; | |
029632fb PZ |
29 | #ifdef CONFIG_SMP |
30 | struct sched_domain *sd; | |
31 | int dcount = 0; | |
32 | #endif | |
cb152ff2 NZ |
33 | cpu = (unsigned long)(v - 2); |
34 | rq = cpu_rq(cpu); | |
029632fb PZ |
35 | |
36 | /* runqueue-specific stats */ | |
37 | seq_printf(seq, | |
30fd049a | 38 | "cpu%d %u 0 %u %u %u %u %llu %llu %lu", |
029632fb | 39 | cpu, rq->yld_count, |
30fd049a | 40 | rq->sched_count, rq->sched_goidle, |
029632fb PZ |
41 | rq->ttwu_count, rq->ttwu_local, |
42 | rq->rq_cpu_time, | |
43 | rq->rq_sched_info.run_delay, rq->rq_sched_info.pcount); | |
44 | ||
45 | seq_printf(seq, "\n"); | |
46 | ||
47 | #ifdef CONFIG_SMP | |
48 | /* domain-specific stats */ | |
49 | rcu_read_lock(); | |
50 | for_each_domain(cpu, sd) { | |
51 | enum cpu_idle_type itype; | |
52 | ||
53 | cpumask_scnprintf(mask_str, mask_len, | |
54 | sched_domain_span(sd)); | |
55 | seq_printf(seq, "domain%d %s", dcount++, mask_str); | |
56 | for (itype = CPU_IDLE; itype < CPU_MAX_IDLE_TYPES; | |
57 | itype++) { | |
58 | seq_printf(seq, " %u %u %u %u %u %u %u %u", | |
59 | sd->lb_count[itype], | |
60 | sd->lb_balanced[itype], | |
61 | sd->lb_failed[itype], | |
62 | sd->lb_imbalance[itype], | |
63 | sd->lb_gained[itype], | |
64 | sd->lb_hot_gained[itype], | |
65 | sd->lb_nobusyq[itype], | |
66 | sd->lb_nobusyg[itype]); | |
67 | } | |
68 | seq_printf(seq, | |
69 | " %u %u %u %u %u %u %u %u %u %u %u %u\n", | |
70 | sd->alb_count, sd->alb_failed, sd->alb_pushed, | |
71 | sd->sbe_count, sd->sbe_balanced, sd->sbe_pushed, | |
72 | sd->sbf_count, sd->sbf_balanced, sd->sbf_pushed, | |
73 | sd->ttwu_wake_remote, sd->ttwu_move_affine, | |
74 | sd->ttwu_move_balance); | |
75 | } | |
76 | rcu_read_unlock(); | |
77 | #endif | |
78 | } | |
79 | kfree(mask_str); | |
80 | return 0; | |
81 | } | |
82 | ||
cb152ff2 NZ |
83 | /* |
84 | * This itererator needs some explanation. | |
85 | * It returns 1 for the header position. | |
86 | * This means 2 is cpu 0. | |
87 | * In a hotplugged system some cpus, including cpu 0, may be missing so we have | |
88 | * to use cpumask_* to iterate over the cpus. | |
89 | */ | |
90 | static void *schedstat_start(struct seq_file *file, loff_t *offset) | |
029632fb | 91 | { |
cb152ff2 | 92 | unsigned long n = *offset; |
029632fb | 93 | |
cb152ff2 NZ |
94 | if (n == 0) |
95 | return (void *) 1; | |
96 | ||
97 | n--; | |
98 | ||
99 | if (n > 0) | |
100 | n = cpumask_next(n - 1, cpu_online_mask); | |
101 | else | |
102 | n = cpumask_first(cpu_online_mask); | |
103 | ||
104 | *offset = n + 1; | |
105 | ||
106 | if (n < nr_cpu_ids) | |
107 | return (void *)(unsigned long)(n + 2); | |
108 | return NULL; | |
109 | } | |
110 | ||
111 | static void *schedstat_next(struct seq_file *file, void *data, loff_t *offset) | |
112 | { | |
113 | (*offset)++; | |
114 | return schedstat_start(file, offset); | |
115 | } | |
116 | ||
117 | static void schedstat_stop(struct seq_file *file, void *data) | |
118 | { | |
119 | } | |
120 | ||
121 | static const struct seq_operations schedstat_sops = { | |
122 | .start = schedstat_start, | |
123 | .next = schedstat_next, | |
124 | .stop = schedstat_stop, | |
125 | .show = show_schedstat, | |
126 | }; | |
127 | ||
128 | static int schedstat_open(struct inode *inode, struct file *file) | |
129 | { | |
130 | return seq_open(file, &schedstat_sops); | |
029632fb PZ |
131 | } |
132 | ||
133 | static const struct file_operations proc_schedstat_operations = { | |
134 | .open = schedstat_open, | |
135 | .read = seq_read, | |
136 | .llseek = seq_lseek, | |
8e0bcc72 | 137 | .release = seq_release, |
029632fb PZ |
138 | }; |
139 | ||
140 | static int __init proc_schedstat_init(void) | |
141 | { | |
142 | proc_create("schedstat", 0, NULL, &proc_schedstat_operations); | |
143 | return 0; | |
144 | } | |
c96d6660 | 145 | subsys_initcall(proc_schedstat_init); |