286 lines
6.8 KiB
C
286 lines
6.8 KiB
C
/*
|
|
* 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 <linux/tick.h>
|
|
|
|
#include <asm/uaccess.h>
|
|
|
|
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, "<%p>", sym);
|
|
else
|
|
SEQ_printf(m, "%s", symname);
|
|
}
|
|
|
|
static void
|
|
print_timer(struct seq_file *m, 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, timer);
|
|
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 nsecs [in %Lu nsecs]\n",
|
|
(unsigned long long)ktime_to_ns(timer->expires),
|
|
(unsigned long long)(ktime_to_ns(timer->expires) - 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 rb_node *curr;
|
|
unsigned long flags;
|
|
|
|
next_one:
|
|
i = 0;
|
|
spin_lock_irqsave(&base->cpu_base->lock, flags);
|
|
|
|
curr = base->first;
|
|
/*
|
|
* 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 = rb_next(curr);
|
|
i++;
|
|
}
|
|
|
|
if (curr) {
|
|
|
|
timer = rb_entry(curr, struct hrtimer, node);
|
|
tmp = *timer;
|
|
spin_unlock_irqrestore(&base->cpu_base->lock, flags);
|
|
|
|
print_timer(m, &tmp, i, now);
|
|
next++;
|
|
goto next_one;
|
|
}
|
|
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, " .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, "\ncpu: %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);
|
|
#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(idle_tick);
|
|
P(tick_stopped);
|
|
P(idle_jiffies);
|
|
P(idle_calls);
|
|
P(idle_sleeps);
|
|
P_ns(idle_entrytime);
|
|
P_ns(idle_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
|
|
}
|
|
|
|
#ifdef CONFIG_GENERIC_CLOCKEVENTS
|
|
static void
|
|
print_tickdevice(struct seq_file *m, struct tick_device *td)
|
|
{
|
|
struct clock_event_device *dev = td->evtdev;
|
|
|
|
SEQ_printf(m, "\nTick Device: mode: %d\n", td->mode);
|
|
|
|
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: %lu\n", dev->max_delta_ns);
|
|
SEQ_printf(m, " min_delta_ns: %lu\n", dev->min_delta_ns);
|
|
SEQ_printf(m, " mult: %lu\n", dev->mult);
|
|
SEQ_printf(m, " shift: %d\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");
|
|
|
|
SEQ_printf(m, " set_mode: ");
|
|
print_name_offset(m, dev->set_mode);
|
|
SEQ_printf(m, "\n");
|
|
|
|
SEQ_printf(m, " event_handler: ");
|
|
print_name_offset(m, dev->event_handler);
|
|
SEQ_printf(m, "\n");
|
|
}
|
|
|
|
static void timer_list_show_tickdevices(struct seq_file *m)
|
|
{
|
|
int cpu;
|
|
|
|
#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
|
|
print_tickdevice(m, tick_get_broadcast_device());
|
|
SEQ_printf(m, "tick_broadcast_mask: %08lx\n",
|
|
tick_get_broadcast_mask()->bits[0]);
|
|
#ifdef CONFIG_TICK_ONESHOT
|
|
SEQ_printf(m, "tick_broadcast_oneshot_mask: %08lx\n",
|
|
tick_get_broadcast_oneshot_mask()->bits[0]);
|
|
#endif
|
|
SEQ_printf(m, "\n");
|
|
#endif
|
|
for_each_online_cpu(cpu)
|
|
print_tickdevice(m, tick_get_device(cpu));
|
|
SEQ_printf(m, "\n");
|
|
}
|
|
#else
|
|
static void timer_list_show_tickdevices(struct seq_file *m) { }
|
|
#endif
|
|
|
|
static int timer_list_show(struct seq_file *m, void *v)
|
|
{
|
|
u64 now = ktime_to_ns(ktime_get());
|
|
int cpu;
|
|
|
|
SEQ_printf(m, "Timer List Version: v0.3\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);
|
|
|
|
for_each_online_cpu(cpu)
|
|
print_cpu(m, cpu, now);
|
|
|
|
SEQ_printf(m, "\n");
|
|
timer_list_show_tickdevices(m);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void sysrq_timer_list_show(void)
|
|
{
|
|
timer_list_show(NULL, NULL);
|
|
}
|
|
|
|
static int timer_list_open(struct inode *inode, struct file *filp)
|
|
{
|
|
return single_open(filp, timer_list_show, NULL);
|
|
}
|
|
|
|
static struct file_operations timer_list_fops = {
|
|
.open = timer_list_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release,
|
|
};
|
|
|
|
static int __init init_timer_list_procfs(void)
|
|
{
|
|
struct proc_dir_entry *pe;
|
|
|
|
pe = create_proc_entry("timer_list", 0644, NULL);
|
|
if (!pe)
|
|
return -ENOMEM;
|
|
|
|
pe->proc_fops = &timer_list_fops;
|
|
|
|
return 0;
|
|
}
|
|
__initcall(init_timer_list_procfs);
|