| Peter Zijlstra | 029632f | 2011-10-25 10:00:11 +0200 | [diff] [blame] | 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, |
| 35 | "cpu%d %u %u %u %u %u %u %llu %llu %lu", |
| 36 | cpu, rq->yld_count, |
| 37 | rq->sched_switch, rq->sched_count, rq->sched_goidle, |
| 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); |