diff options
Diffstat (limited to 'kernel/sched_debug.c')
-rw-r--r-- | kernel/sched_debug.c | 469 |
1 files changed, 469 insertions, 0 deletions
diff --git a/kernel/sched_debug.c b/kernel/sched_debug.c new file mode 100644 index 0000000..26ed8e3 --- /dev/null +++ b/kernel/sched_debug.c @@ -0,0 +1,469 @@ +/* + * 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) + +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.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]; + + cgroup_path(task_group(p)->css.cgroup, path, sizeof(path)); + 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); +} + +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 = &per_cpu(runqueues, cpu); + struct sched_entity *last; + unsigned long flags; + +#if defined(CONFIG_CGROUP_SCHED) && defined(CONFIG_FAIR_GROUP_SCHED) + char path[128] = ""; + struct cgroup *cgroup = NULL; + struct task_group *tg = cfs_rq->tg; + + if (tg) + cgroup = tg->css.cgroup; + + if (cgroup) + cgroup_path(cgroup, 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)); + + 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 = per_cpu(runqueues, 0).cfs.min_vruntime; + 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 +#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 cgroup *cgroup = NULL; + struct task_group *tg = rt_rq->tg; + + if (tg) + cgroup = tg->css.cgroup; + + if (cgroup) + cgroup_path(cgroup, 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 = &per_cpu(runqueues, 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); + SEQ_printf(m, " .%-30s: %lu\n", "jiffies", jiffies); + 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); + + P(yld_exp_empty); + P(yld_act_empty); + P(yld_both_empty); + P(yld_count); + + P(sched_switch); + P(sched_count); + P(sched_goidle); + + 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 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: v0.07, %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)) + 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 + + 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; + unsigned long flags; + int num_threads = 1; + + if (lock_task_sighand(p, &flags)) { + num_threads = atomic_read(&p->signal->count); + unlock_task_sighand(p, &flags); + } + + SEQ_printf(m, "%s (%d, #threads: %d)\n", p->comm, p->pid, num_threads); + 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); + PN(se.avg_overlap); + + nr_switches = p->nvcsw + p->nivcsw; + +#ifdef CONFIG_SCHEDSTATS + PN(se.wait_start); + PN(se.sleep_start); + PN(se.block_start); + PN(se.sleep_max); + PN(se.block_max); + PN(se.exec_max); + PN(se.slice_max); + PN(se.wait_max); + PN(se.wait_sum); + P(se.wait_count); + P(sched_info.bkl_count); + P(se.nr_migrations); + P(se.nr_migrations_cold); + P(se.nr_failed_migrations_affine); + P(se.nr_failed_migrations_running); + P(se.nr_failed_migrations_hot); + P(se.nr_forced_migrations); + P(se.nr_forced2_migrations); + P(se.nr_wakeups); + P(se.nr_wakeups_sync); + P(se.nr_wakeups_migrate); + P(se.nr_wakeups_local); + P(se.nr_wakeups_remote); + P(se.nr_wakeups_affine); + P(se.nr_wakeups_affine_attempts); + P(se.nr_wakeups_passive); + P(se.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 + p->se.wait_max = 0; + p->se.wait_sum = 0; + p->se.wait_count = 0; + p->se.sleep_max = 0; + p->se.sum_sleep_runtime = 0; + p->se.block_max = 0; + p->se.exec_max = 0; + p->se.slice_max = 0; + p->se.nr_migrations = 0; + p->se.nr_migrations_cold = 0; + p->se.nr_failed_migrations_affine = 0; + p->se.nr_failed_migrations_running = 0; + p->se.nr_failed_migrations_hot = 0; + p->se.nr_forced_migrations = 0; + p->se.nr_forced2_migrations = 0; + p->se.nr_wakeups = 0; + p->se.nr_wakeups_sync = 0; + p->se.nr_wakeups_migrate = 0; + p->se.nr_wakeups_local = 0; + p->se.nr_wakeups_remote = 0; + p->se.nr_wakeups_affine = 0; + p->se.nr_wakeups_affine_attempts = 0; + p->se.nr_wakeups_passive = 0; + p->se.nr_wakeups_idle = 0; + p->sched_info.bkl_count = 0; +#endif + p->se.sum_exec_runtime = 0; + p->se.prev_sum_exec_runtime = 0; + p->nvcsw = 0; + p->nivcsw = 0; +} |