| /* |
| * kernel/time/sched_debug.c |
| * |
| * Print the CFS rbtree |
| * |
| * Copyright(C) 2007, Red Hat, Inc., Ingo Molnar |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| |
| #include <linux/proc_fs.h> |
| #include <linux/sched.h> |
| #include <linux/seq_file.h> |
| #include <linux/kallsyms.h> |
| #include <linux/utsname.h> |
| |
| /* |
| * This allows printing both to /proc/sched_debug and |
| * to the console |
| */ |
| #define SEQ_printf(m, x...) \ |
| do { \ |
| if (m) \ |
| seq_printf(m, x); \ |
| else \ |
| printk(x); \ |
| } while (0) |
| |
| /* |
| * Ease the printing of nsec fields: |
| */ |
| static long long nsec_high(unsigned long long nsec) |
| { |
| if ((long long)nsec < 0) { |
| nsec = -nsec; |
| do_div(nsec, 1000000); |
| return -nsec; |
| } |
| do_div(nsec, 1000000); |
| |
| return nsec; |
| } |
| |
| static unsigned long nsec_low(unsigned long long nsec) |
| { |
| if ((long long)nsec < 0) |
| nsec = -nsec; |
| |
| return do_div(nsec, 1000000); |
| } |
| |
| #define SPLIT_NS(x) nsec_high(x), nsec_low(x) |
| |
| #ifdef CONFIG_FAIR_GROUP_SCHED |
| static void print_cfs_group_stats(struct seq_file *m, int cpu, |
| struct task_group *tg) |
| { |
| struct sched_entity *se = tg->se[cpu]; |
| if (!se) |
| return; |
| |
| #define P(F) \ |
| SEQ_printf(m, " .%-30s: %lld\n", #F, (long long)F) |
| #define PN(F) \ |
| SEQ_printf(m, " .%-30s: %lld.%06ld\n", #F, SPLIT_NS((long long)F)) |
| |
| PN(se->exec_start); |
| PN(se->vruntime); |
| PN(se->sum_exec_runtime); |
| #ifdef CONFIG_SCHEDSTATS |
| PN(se->statistics.wait_start); |
| PN(se->statistics.sleep_start); |
| PN(se->statistics.block_start); |
| PN(se->statistics.sleep_max); |
| PN(se->statistics.block_max); |
| PN(se->statistics.exec_max); |
| PN(se->statistics.slice_max); |
| PN(se->statistics.wait_max); |
| PN(se->statistics.wait_sum); |
| P(se->statistics.wait_count); |
| #endif |
| P(se->load.weight); |
| #undef PN |
| #undef P |
| } |
| #endif |
| |
| static void |
| print_task(struct seq_file *m, struct rq *rq, struct task_struct *p) |
| { |
| if (rq->curr == p) |
| SEQ_printf(m, "R"); |
| else |
| SEQ_printf(m, " "); |
| |
| SEQ_printf(m, "%15s %5d %9Ld.%06ld %9Ld %5d ", |
| p->comm, p->pid, |
| SPLIT_NS(p->se.vruntime), |
| (long long)(p->nvcsw + p->nivcsw), |
| p->prio); |
| #ifdef CONFIG_SCHEDSTATS |
| SEQ_printf(m, "%9Ld.%06ld %9Ld.%06ld %9Ld.%06ld", |
| SPLIT_NS(p->se.vruntime), |
| SPLIT_NS(p->se.sum_exec_runtime), |
| SPLIT_NS(p->se.statistics.sum_sleep_runtime)); |
| #else |
| SEQ_printf(m, "%15Ld %15Ld %15Ld.%06ld %15Ld.%06ld %15Ld.%06ld", |
| 0LL, 0LL, 0LL, 0L, 0LL, 0L, 0LL, 0L); |
| #endif |
| |
| #ifdef CONFIG_CGROUP_SCHED |
| { |
| char path[64]; |
| |
| rcu_read_lock(); |
| cgroup_path(task_group(p)->css.cgroup, path, sizeof(path)); |
| rcu_read_unlock(); |
| SEQ_printf(m, " %s", path); |
| } |
| #endif |
| SEQ_printf(m, "\n"); |
| } |
| |
| static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu) |
| { |
| struct task_struct *g, *p; |
| unsigned long flags; |
| |
| SEQ_printf(m, |
| "\nrunnable tasks:\n" |
| " task PID tree-key switches prio" |
| " exec-runtime sum-exec sum-sleep\n" |
| "------------------------------------------------------" |
| "----------------------------------------------------\n"); |
| |
| read_lock_irqsave(&tasklist_lock, flags); |
| |
| do_each_thread(g, p) { |
| if (!p->se.on_rq || task_cpu(p) != rq_cpu) |
| continue; |
| |
| print_task(m, rq, p); |
| } while_each_thread(g, p); |
| |
| read_unlock_irqrestore(&tasklist_lock, flags); |
| } |
| |
| #if defined(CONFIG_CGROUP_SCHED) && \ |
| (defined(CONFIG_FAIR_GROUP_SCHED) || defined(CONFIG_RT_GROUP_SCHED)) |
| static void task_group_path(struct task_group *tg, char *buf, int buflen) |
| { |
| /* may be NULL if the underlying cgroup isn't fully-created yet */ |
| if (!tg->css.cgroup) { |
| buf[0] = '\0'; |
| return; |
| } |
| cgroup_path(tg->css.cgroup, buf, buflen); |
| } |
| #endif |
| |
| void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq) |
| { |
| s64 MIN_vruntime = -1, min_vruntime, max_vruntime = -1, |
| spread, rq0_min_vruntime, spread0; |
| struct rq *rq = cpu_rq(cpu); |
| struct sched_entity *last; |
| unsigned long flags; |
| |
| #if defined(CONFIG_CGROUP_SCHED) && defined(CONFIG_FAIR_GROUP_SCHED) |
| char path[128]; |
| struct task_group *tg = cfs_rq->tg; |
| |
| task_group_path(tg, path, sizeof(path)); |
| |
| SEQ_printf(m, "\ncfs_rq[%d]:%s\n", cpu, path); |
| #else |
| SEQ_printf(m, "\ncfs_rq[%d]:\n", cpu); |
| #endif |
| SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "exec_clock", |
| SPLIT_NS(cfs_rq->exec_clock)); |
| |
| raw_spin_lock_irqsave(&rq->lock, flags); |
| if (cfs_rq->rb_leftmost) |
| MIN_vruntime = (__pick_next_entity(cfs_rq))->vruntime; |
| last = __pick_last_entity(cfs_rq); |
| if (last) |
| max_vruntime = last->vruntime; |
| min_vruntime = cfs_rq->min_vruntime; |
| rq0_min_vruntime = cpu_rq(0)->cfs.min_vruntime; |
| raw_spin_unlock_irqrestore(&rq->lock, flags); |
| SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "MIN_vruntime", |
| SPLIT_NS(MIN_vruntime)); |
| SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "min_vruntime", |
| SPLIT_NS(min_vruntime)); |
| SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "max_vruntime", |
| SPLIT_NS(max_vruntime)); |
| spread = max_vruntime - MIN_vruntime; |
| SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "spread", |
| SPLIT_NS(spread)); |
| spread0 = min_vruntime - rq0_min_vruntime; |
| SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "spread0", |
| SPLIT_NS(spread0)); |
| SEQ_printf(m, " .%-30s: %ld\n", "nr_running", cfs_rq->nr_running); |
| SEQ_printf(m, " .%-30s: %ld\n", "load", cfs_rq->load.weight); |
| |
| SEQ_printf(m, " .%-30s: %d\n", "nr_spread_over", |
| cfs_rq->nr_spread_over); |
| #ifdef CONFIG_FAIR_GROUP_SCHED |
| #ifdef CONFIG_SMP |
| SEQ_printf(m, " .%-30s: %lu\n", "shares", cfs_rq->shares); |
| #endif |
| print_cfs_group_stats(m, cpu, cfs_rq->tg); |
| #endif |
| } |
| |
| void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq) |
| { |
| #if defined(CONFIG_CGROUP_SCHED) && defined(CONFIG_RT_GROUP_SCHED) |
| char path[128]; |
| struct task_group *tg = rt_rq->tg; |
| |
| task_group_path(tg, path, sizeof(path)); |
| |
| SEQ_printf(m, "\nrt_rq[%d]:%s\n", cpu, path); |
| #else |
| SEQ_printf(m, "\nrt_rq[%d]:\n", cpu); |
| #endif |
| |
| |
| #define P(x) \ |
| SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rt_rq->x)) |
| #define PN(x) \ |
| SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rt_rq->x)) |
| |
| P(rt_nr_running); |
| P(rt_throttled); |
| PN(rt_time); |
| PN(rt_runtime); |
| |
| #undef PN |
| #undef P |
| } |
| |
| static void print_cpu(struct seq_file *m, int cpu) |
| { |
| struct rq *rq = cpu_rq(cpu); |
| |
| #ifdef CONFIG_X86 |
| { |
| unsigned int freq = cpu_khz ? : 1; |
| |
| SEQ_printf(m, "\ncpu#%d, %u.%03u MHz\n", |
| cpu, freq / 1000, (freq % 1000)); |
| } |
| #else |
| SEQ_printf(m, "\ncpu#%d\n", cpu); |
| #endif |
| |
| #define P(x) \ |
| SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rq->x)) |
| #define PN(x) \ |
| SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rq->x)) |
| |
| P(nr_running); |
| SEQ_printf(m, " .%-30s: %lu\n", "load", |
| rq->load.weight); |
| P(nr_switches); |
| P(nr_load_updates); |
| P(nr_uninterruptible); |
| PN(next_balance); |
| P(curr->pid); |
| PN(clock); |
| P(cpu_load[0]); |
| P(cpu_load[1]); |
| P(cpu_load[2]); |
| P(cpu_load[3]); |
| P(cpu_load[4]); |
| #undef P |
| #undef PN |
| |
| #ifdef CONFIG_SCHEDSTATS |
| #define P(n) SEQ_printf(m, " .%-30s: %d\n", #n, rq->n); |
| #define P64(n) SEQ_printf(m, " .%-30s: %Ld\n", #n, rq->n); |
| |
| P(yld_count); |
| |
| P(sched_switch); |
| P(sched_count); |
| P(sched_goidle); |
| #ifdef CONFIG_SMP |
| P64(avg_idle); |
| #endif |
| |
| P(ttwu_count); |
| P(ttwu_local); |
| |
| P(bkl_count); |
| |
| #undef P |
| #endif |
| print_cfs_stats(m, cpu); |
| print_rt_stats(m, cpu); |
| |
| print_rq(m, rq, cpu); |
| } |
| |
| static const char *sched_tunable_scaling_names[] = { |
| "none", |
| "logaritmic", |
| "linear" |
| }; |
| |
| static int sched_debug_show(struct seq_file *m, void *v) |
| { |
| u64 now = ktime_to_ns(ktime_get()); |
| int cpu; |
| |
| SEQ_printf(m, "Sched Debug Version: v0.09, %s %.*s\n", |
| init_utsname()->release, |
| (int)strcspn(init_utsname()->version, " "), |
| init_utsname()->version); |
| |
| SEQ_printf(m, "now at %Lu.%06ld msecs\n", SPLIT_NS(now)); |
| |
| #define P(x) \ |
| SEQ_printf(m, " .%-40s: %Ld\n", #x, (long long)(x)) |
| #define PN(x) \ |
| SEQ_printf(m, " .%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x)) |
| P(jiffies); |
| PN(sysctl_sched_latency); |
| PN(sysctl_sched_min_granularity); |
| PN(sysctl_sched_wakeup_granularity); |
| PN(sysctl_sched_child_runs_first); |
| P(sysctl_sched_features); |
| #undef PN |
| #undef P |
| |
| SEQ_printf(m, " .%-40s: %d (%s)\n", "sysctl_sched_tunable_scaling", |
| sysctl_sched_tunable_scaling, |
| sched_tunable_scaling_names[sysctl_sched_tunable_scaling]); |
| |
| for_each_online_cpu(cpu) |
| print_cpu(m, cpu); |
| |
| SEQ_printf(m, "\n"); |
| |
| return 0; |
| } |
| |
| static void sysrq_sched_debug_show(void) |
| { |
| sched_debug_show(NULL, NULL); |
| } |
| |
| static int sched_debug_open(struct inode *inode, struct file *filp) |
| { |
| return single_open(filp, sched_debug_show, NULL); |
| } |
| |
| static const struct file_operations sched_debug_fops = { |
| .open = sched_debug_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = single_release, |
| }; |
| |
| static int __init init_sched_debug_procfs(void) |
| { |
| struct proc_dir_entry *pe; |
| |
| pe = proc_create("sched_debug", 0444, NULL, &sched_debug_fops); |
| if (!pe) |
| return -ENOMEM; |
| return 0; |
| } |
| |
| __initcall(init_sched_debug_procfs); |
| |
| void proc_sched_show_task(struct task_struct *p, struct seq_file *m) |
| { |
| unsigned long nr_switches; |
| |
| SEQ_printf(m, "%s (%d, #threads: %d)\n", p->comm, p->pid, |
| get_nr_threads(p)); |
| SEQ_printf(m, |
| "---------------------------------------------------------\n"); |
| #define __P(F) \ |
| SEQ_printf(m, "%-35s:%21Ld\n", #F, (long long)F) |
| #define P(F) \ |
| SEQ_printf(m, "%-35s:%21Ld\n", #F, (long long)p->F) |
| #define __PN(F) \ |
| SEQ_printf(m, "%-35s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)F)) |
| #define PN(F) \ |
| SEQ_printf(m, "%-35s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)p->F)) |
| |
| PN(se.exec_start); |
| PN(se.vruntime); |
| PN(se.sum_exec_runtime); |
| |
| nr_switches = p->nvcsw + p->nivcsw; |
| |
| #ifdef CONFIG_SCHEDSTATS |
| PN(se.statistics.wait_start); |
| PN(se.statistics.sleep_start); |
| PN(se.statistics.block_start); |
| PN(se.statistics.sleep_max); |
| PN(se.statistics.block_max); |
| PN(se.statistics.exec_max); |
| PN(se.statistics.slice_max); |
| PN(se.statistics.wait_max); |
| PN(se.statistics.wait_sum); |
| P(se.statistics.wait_count); |
| PN(se.statistics.iowait_sum); |
| P(se.statistics.iowait_count); |
| P(sched_info.bkl_count); |
| P(se.nr_migrations); |
| P(se.statistics.nr_migrations_cold); |
| P(se.statistics.nr_failed_migrations_affine); |
| P(se.statistics.nr_failed_migrations_running); |
| P(se.statistics.nr_failed_migrations_hot); |
| P(se.statistics.nr_forced_migrations); |
| P(se.statistics.nr_wakeups); |
| P(se.statistics.nr_wakeups_sync); |
| P(se.statistics.nr_wakeups_migrate); |
| P(se.statistics.nr_wakeups_local); |
| P(se.statistics.nr_wakeups_remote); |
| P(se.statistics.nr_wakeups_affine); |
| P(se.statistics.nr_wakeups_affine_attempts); |
| P(se.statistics.nr_wakeups_passive); |
| P(se.statistics.nr_wakeups_idle); |
| |
| { |
| u64 avg_atom, avg_per_cpu; |
| |
| avg_atom = p->se.sum_exec_runtime; |
| if (nr_switches) |
| do_div(avg_atom, nr_switches); |
| else |
| avg_atom = -1LL; |
| |
| avg_per_cpu = p->se.sum_exec_runtime; |
| if (p->se.nr_migrations) { |
| avg_per_cpu = div64_u64(avg_per_cpu, |
| p->se.nr_migrations); |
| } else { |
| avg_per_cpu = -1LL; |
| } |
| |
| __PN(avg_atom); |
| __PN(avg_per_cpu); |
| } |
| #endif |
| __P(nr_switches); |
| SEQ_printf(m, "%-35s:%21Ld\n", |
| "nr_voluntary_switches", (long long)p->nvcsw); |
| SEQ_printf(m, "%-35s:%21Ld\n", |
| "nr_involuntary_switches", (long long)p->nivcsw); |
| |
| P(se.load.weight); |
| P(policy); |
| P(prio); |
| #undef PN |
| #undef __PN |
| #undef P |
| #undef __P |
| |
| { |
| unsigned int this_cpu = raw_smp_processor_id(); |
| u64 t0, t1; |
| |
| t0 = cpu_clock(this_cpu); |
| t1 = cpu_clock(this_cpu); |
| SEQ_printf(m, "%-35s:%21Ld\n", |
| "clock-delta", (long long)(t1-t0)); |
| } |
| } |
| |
| void proc_sched_set_task(struct task_struct *p) |
| { |
| #ifdef CONFIG_SCHEDSTATS |
| memset(&p->se.statistics, 0, sizeof(p->se.statistics)); |
| #endif |
| } |