/* * 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 = single_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);