| /* |
| * 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 *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 nsecs [in %Ld nsecs]\n", |
| (unsigned long long)ktime_to_ns(timer->expires), |
| (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, timer, &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, "\n"); |
| 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); |
| #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_waketime); |
| P_ns(idle_exittime); |
| 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, int cpu) |
| { |
| struct clock_event_device *dev = td->evtdev; |
| |
| SEQ_printf(m, "\n"); |
| 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: %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(), -1); |
| 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), 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 = single_release, |
| }; |
| |
| static int __init init_timer_list_procfs(void) |
| { |
| struct proc_dir_entry *pe; |
| |
| pe = proc_create("timer_list", 0644, NULL, &timer_list_fops); |
| if (!pe) |
| return -ENOMEM; |
| return 0; |
| } |
| __initcall(init_timer_list_procfs); |