diff options
Diffstat (limited to 'kernel/time/timer_list.c')
| -rw-r--r-- | kernel/time/timer_list.c | 396 |
1 files changed, 396 insertions, 0 deletions
diff --git a/kernel/time/timer_list.c b/kernel/time/timer_list.c new file mode 100644 index 000000000..e878c2e0b --- /dev/null +++ b/kernel/time/timer_list.c @@ -0,0 +1,396 @@ +/* + * kernel/time/timer_list.c + * + * List pending timers + * + * Copyright(C) 2006, 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/module.h> +#include <linux/spinlock.h> +#include <linux/sched.h> +#include <linux/seq_file.h> +#include <linux/kallsyms.h> + +#include <asm/uaccess.h> + +#include "tick-internal.h" + +struct timer_list_iter { + int cpu; + bool second_pass; + u64 now; +}; + +typedef void (*print_fn_t)(struct seq_file *m, unsigned int *classes); + +DECLARE_PER_CPU(struct hrtimer_cpu_base, hrtimer_bases); + +/* + * This allows printing both to /proc/timer_list and + * to the console (on SysRq-Q): + */ +#define SEQ_printf(m, x...) \ + do { \ + if (m) \ + seq_printf(m, x); \ + else \ + printk(x); \ + } while (0) + +static void print_name_offset(struct seq_file *m, void *sym) +{ + char symname[KSYM_NAME_LEN]; + + if (lookup_symbol_name((unsigned long)sym, symname) < 0) + SEQ_printf(m, "<%pK>", sym); + else + SEQ_printf(m, "%s", symname); +} + +static void +print_timer(struct seq_file *m, struct hrtimer *taddr, struct hrtimer *timer, + int idx, u64 now) +{ +#ifdef CONFIG_TIMER_STATS + char tmp[TASK_COMM_LEN + 1]; +#endif + SEQ_printf(m, " #%d: ", idx); + print_name_offset(m, taddr); + SEQ_printf(m, ", "); + print_name_offset(m, timer->function); + SEQ_printf(m, ", S:%02lx", timer->state); +#ifdef CONFIG_TIMER_STATS + SEQ_printf(m, ", "); + print_name_offset(m, timer->start_site); + memcpy(tmp, timer->start_comm, TASK_COMM_LEN); + tmp[TASK_COMM_LEN] = 0; + SEQ_printf(m, ", %s/%d", tmp, timer->start_pid); +#endif + SEQ_printf(m, "\n"); + SEQ_printf(m, " # expires at %Lu-%Lu nsecs [in %Ld to %Ld nsecs]\n", + (unsigned long long)ktime_to_ns(hrtimer_get_softexpires(timer)), + (unsigned long long)ktime_to_ns(hrtimer_get_expires(timer)), + (long long)(ktime_to_ns(hrtimer_get_softexpires(timer)) - now), + (long long)(ktime_to_ns(hrtimer_get_expires(timer)) - now)); +} + +static void +print_active_timers(struct seq_file *m, struct hrtimer_clock_base *base, + u64 now) +{ + struct hrtimer *timer, tmp; + unsigned long next = 0, i; + struct timerqueue_node *curr; + unsigned long flags; + +next_one: + i = 0; + raw_spin_lock_irqsave(&base->cpu_base->lock, flags); + + curr = timerqueue_getnext(&base->active); + /* + * Crude but we have to do this O(N*N) thing, because + * we have to unlock the base when printing: + */ + while (curr && i < next) { + curr = timerqueue_iterate_next(curr); + i++; + } + + if (curr) { + + timer = container_of(curr, struct hrtimer, node); + tmp = *timer; + raw_spin_unlock_irqrestore(&base->cpu_base->lock, flags); + + print_timer(m, timer, &tmp, i, now); + next++; + goto next_one; + } + raw_spin_unlock_irqrestore(&base->cpu_base->lock, flags); +} + +static void +print_base(struct seq_file *m, struct hrtimer_clock_base *base, u64 now) +{ + SEQ_printf(m, " .base: %pK\n", base); + SEQ_printf(m, " .index: %d\n", + base->index); + SEQ_printf(m, " .resolution: %Lu nsecs\n", + (unsigned long long)ktime_to_ns(base->resolution)); + SEQ_printf(m, " .get_time: "); + print_name_offset(m, base->get_time); + SEQ_printf(m, "\n"); +#ifdef CONFIG_HIGH_RES_TIMERS + SEQ_printf(m, " .offset: %Lu nsecs\n", + (unsigned long long) ktime_to_ns(base->offset)); +#endif + SEQ_printf(m, "active timers:\n"); + print_active_timers(m, base, now); +} + +static void print_cpu(struct seq_file *m, int cpu, u64 now) +{ + struct hrtimer_cpu_base *cpu_base = &per_cpu(hrtimer_bases, cpu); + int i; + + SEQ_printf(m, "cpu: %d\n", cpu); + for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) { + SEQ_printf(m, " clock %d:\n", i); + print_base(m, cpu_base->clock_base + i, now); + } +#define P(x) \ + SEQ_printf(m, " .%-15s: %Lu\n", #x, \ + (unsigned long long)(cpu_base->x)) +#define P_ns(x) \ + SEQ_printf(m, " .%-15s: %Lu nsecs\n", #x, \ + (unsigned long long)(ktime_to_ns(cpu_base->x))) + +#ifdef CONFIG_HIGH_RES_TIMERS + P_ns(expires_next); + P(hres_active); + P(nr_events); + P(nr_retries); + P(nr_hangs); + P_ns(max_hang_time); +#endif +#undef P +#undef P_ns + +#ifdef CONFIG_TICK_ONESHOT +# define P(x) \ + SEQ_printf(m, " .%-15s: %Lu\n", #x, \ + (unsigned long long)(ts->x)) +# define P_ns(x) \ + SEQ_printf(m, " .%-15s: %Lu nsecs\n", #x, \ + (unsigned long long)(ktime_to_ns(ts->x))) + { + struct tick_sched *ts = tick_get_tick_sched(cpu); + P(nohz_mode); + P_ns(last_tick); + P(tick_stopped); + P(idle_jiffies); + P(idle_calls); + P(idle_sleeps); + P_ns(idle_entrytime); + P_ns(idle_waketime); + P_ns(idle_exittime); + P_ns(idle_sleeptime); + P_ns(iowait_sleeptime); + P(last_jiffies); + P(next_jiffies); + P_ns(idle_expires); + SEQ_printf(m, "jiffies: %Lu\n", + (unsigned long long)jiffies); + } +#endif + +#undef P +#undef P_ns + SEQ_printf(m, "\n"); +} + +#ifdef CONFIG_GENERIC_CLOCKEVENTS +static void +print_tickdevice(struct seq_file *m, struct tick_device *td, int cpu) +{ + struct clock_event_device *dev = td->evtdev; + + SEQ_printf(m, "Tick Device: mode: %d\n", td->mode); + if (cpu < 0) + SEQ_printf(m, "Broadcast device\n"); + else + SEQ_printf(m, "Per CPU device: %d\n", cpu); + + SEQ_printf(m, "Clock Event Device: "); + if (!dev) { + SEQ_printf(m, "<NULL>\n"); + return; + } + SEQ_printf(m, "%s\n", dev->name); + SEQ_printf(m, " max_delta_ns: %llu\n", + (unsigned long long) dev->max_delta_ns); + SEQ_printf(m, " min_delta_ns: %llu\n", + (unsigned long long) dev->min_delta_ns); + SEQ_printf(m, " mult: %u\n", dev->mult); + SEQ_printf(m, " shift: %u\n", dev->shift); + SEQ_printf(m, " mode: %d\n", dev->mode); + SEQ_printf(m, " next_event: %Ld nsecs\n", + (unsigned long long) ktime_to_ns(dev->next_event)); + + SEQ_printf(m, " set_next_event: "); + print_name_offset(m, dev->set_next_event); + SEQ_printf(m, "\n"); + + if (dev->set_mode) { + SEQ_printf(m, " set_mode: "); + print_name_offset(m, dev->set_mode); + SEQ_printf(m, "\n"); + } else { + if (dev->set_state_shutdown) { + SEQ_printf(m, " shutdown: "); + print_name_offset(m, dev->set_state_shutdown); + SEQ_printf(m, "\n"); + } + + if (dev->set_state_periodic) { + SEQ_printf(m, " periodic: "); + print_name_offset(m, dev->set_state_periodic); + SEQ_printf(m, "\n"); + } + + if (dev->set_state_oneshot) { + SEQ_printf(m, " oneshot: "); + print_name_offset(m, dev->set_state_oneshot); + SEQ_printf(m, "\n"); + } + + if (dev->tick_resume) { + SEQ_printf(m, " resume: "); + print_name_offset(m, dev->tick_resume); + SEQ_printf(m, "\n"); + } + } + + SEQ_printf(m, " event_handler: "); + print_name_offset(m, dev->event_handler); + SEQ_printf(m, "\n"); + SEQ_printf(m, " retries: %lu\n", dev->retries); + SEQ_printf(m, "\n"); +} + +static void timer_list_show_tickdevices_header(struct seq_file *m) +{ +#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST + print_tickdevice(m, tick_get_broadcast_device(), -1); + SEQ_printf(m, "tick_broadcast_mask: %08lx\n", + cpumask_bits(tick_get_broadcast_mask())[0]); +#ifdef CONFIG_TICK_ONESHOT + SEQ_printf(m, "tick_broadcast_oneshot_mask: %08lx\n", + cpumask_bits(tick_get_broadcast_oneshot_mask())[0]); +#endif + SEQ_printf(m, "\n"); +#endif +} +#endif + +static inline void timer_list_header(struct seq_file *m, u64 now) +{ + SEQ_printf(m, "Timer List Version: v0.7\n"); + SEQ_printf(m, "HRTIMER_MAX_CLOCK_BASES: %d\n", HRTIMER_MAX_CLOCK_BASES); + SEQ_printf(m, "now at %Ld nsecs\n", (unsigned long long)now); + SEQ_printf(m, "\n"); +} + +static int timer_list_show(struct seq_file *m, void *v) +{ + struct timer_list_iter *iter = v; + + if (iter->cpu == -1 && !iter->second_pass) + timer_list_header(m, iter->now); + else if (!iter->second_pass) + print_cpu(m, iter->cpu, iter->now); +#ifdef CONFIG_GENERIC_CLOCKEVENTS + else if (iter->cpu == -1 && iter->second_pass) + timer_list_show_tickdevices_header(m); + else + print_tickdevice(m, tick_get_device(iter->cpu), iter->cpu); +#endif + return 0; +} + +void sysrq_timer_list_show(void) +{ + u64 now = ktime_to_ns(ktime_get()); + int cpu; + + timer_list_header(NULL, now); + + for_each_online_cpu(cpu) + print_cpu(NULL, cpu, now); + +#ifdef CONFIG_GENERIC_CLOCKEVENTS + timer_list_show_tickdevices_header(NULL); + for_each_online_cpu(cpu) + print_tickdevice(NULL, tick_get_device(cpu), cpu); +#endif + return; +} + +static void *move_iter(struct timer_list_iter *iter, loff_t offset) +{ + for (; offset; offset--) { + iter->cpu = cpumask_next(iter->cpu, cpu_online_mask); + if (iter->cpu >= nr_cpu_ids) { +#ifdef CONFIG_GENERIC_CLOCKEVENTS + if (!iter->second_pass) { + iter->cpu = -1; + iter->second_pass = true; + } else + return NULL; +#else + return NULL; +#endif + } + } + return iter; +} + +static void *timer_list_start(struct seq_file *file, loff_t *offset) +{ + struct timer_list_iter *iter = file->private; + + if (!*offset) + iter->now = ktime_to_ns(ktime_get()); + iter->cpu = -1; + iter->second_pass = false; + return move_iter(iter, *offset); +} + +static void *timer_list_next(struct seq_file *file, void *v, loff_t *offset) +{ + struct timer_list_iter *iter = file->private; + ++*offset; + return move_iter(iter, 1); +} + +static void timer_list_stop(struct seq_file *seq, void *v) +{ +} + +static const struct seq_operations timer_list_sops = { + .start = timer_list_start, + .next = timer_list_next, + .stop = timer_list_stop, + .show = timer_list_show, +}; + +static int timer_list_open(struct inode *inode, struct file *filp) +{ + return seq_open_private(filp, &timer_list_sops, + sizeof(struct timer_list_iter)); +} + +static const struct file_operations timer_list_fops = { + .open = timer_list_open, + .read = seq_read, + .llseek = seq_lseek, + .release = seq_release_private, +}; + +static int __init init_timer_list_procfs(void) +{ + struct proc_dir_entry *pe; + + pe = proc_create("timer_list", 0444, NULL, &timer_list_fops); + if (!pe) + return -ENOMEM; + return 0; +} +__initcall(init_timer_list_procfs); |