2 * kernel/time/timer_list.c
6 * Copyright(C) 2006, Red Hat, Inc., Ingo Molnar
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
13 #include <linux/proc_fs.h>
14 #include <linux/module.h>
15 #include <linux/spinlock.h>
16 #include <linux/sched.h>
17 #include <linux/seq_file.h>
18 #include <linux/kallsyms.h>
19 #include <linux/tick.h>
21 #include <asm/uaccess.h>
23 typedef void (*print_fn_t)(struct seq_file *m, unsigned int *classes);
25 DECLARE_PER_CPU(struct hrtimer_cpu_base, hrtimer_bases);
28 * This allows printing both to /proc/timer_list and
29 * to the console (on SysRq-Q):
31 #define SEQ_printf(m, x...) \
39 static void print_name_offset(struct seq_file *m, void *sym)
41 char symname[KSYM_NAME_LEN];
43 if (lookup_symbol_name((unsigned long)sym, symname) < 0)
44 SEQ_printf(m, "<%p>", sym);
46 SEQ_printf(m, "%s", symname);
50 print_timer(struct seq_file *m, struct hrtimer *taddr, struct hrtimer *timer,
53 #ifdef CONFIG_TIMER_STATS
54 char tmp[TASK_COMM_LEN + 1];
56 SEQ_printf(m, " #%d: ", idx);
57 print_name_offset(m, taddr);
59 print_name_offset(m, timer->function);
60 SEQ_printf(m, ", S:%02lx", timer->state);
61 #ifdef CONFIG_TIMER_STATS
63 print_name_offset(m, timer->start_site);
64 memcpy(tmp, timer->start_comm, TASK_COMM_LEN);
65 tmp[TASK_COMM_LEN] = 0;
66 SEQ_printf(m, ", %s/%d", tmp, timer->start_pid);
69 SEQ_printf(m, " # expires at %Lu-%Lu nsecs [in %Ld to %Ld nsecs]\n",
70 (unsigned long long)ktime_to_ns(hrtimer_get_softexpires(timer)),
71 (unsigned long long)ktime_to_ns(hrtimer_get_expires(timer)),
72 (long long)(ktime_to_ns(hrtimer_get_softexpires(timer)) - now),
73 (long long)(ktime_to_ns(hrtimer_get_expires(timer)) - now));
77 print_active_timers(struct seq_file *m, struct hrtimer_clock_base *base,
80 struct hrtimer *timer, tmp;
81 unsigned long next = 0, i;
87 spin_lock_irqsave(&base->cpu_base->lock, flags);
91 * Crude but we have to do this O(N*N) thing, because
92 * we have to unlock the base when printing:
94 while (curr && i < next) {
101 timer = rb_entry(curr, struct hrtimer, node);
103 spin_unlock_irqrestore(&base->cpu_base->lock, flags);
105 print_timer(m, timer, &tmp, i, now);
109 spin_unlock_irqrestore(&base->cpu_base->lock, flags);
113 print_base(struct seq_file *m, struct hrtimer_clock_base *base, u64 now)
115 SEQ_printf(m, " .base: %p\n", base);
116 SEQ_printf(m, " .index: %d\n",
118 SEQ_printf(m, " .resolution: %Lu nsecs\n",
119 (unsigned long long)ktime_to_ns(base->resolution));
120 SEQ_printf(m, " .get_time: ");
121 print_name_offset(m, base->get_time);
123 #ifdef CONFIG_HIGH_RES_TIMERS
124 SEQ_printf(m, " .offset: %Lu nsecs\n",
125 (unsigned long long) ktime_to_ns(base->offset));
127 SEQ_printf(m, "active timers:\n");
128 print_active_timers(m, base, now);
131 static void print_cpu(struct seq_file *m, int cpu, u64 now)
133 struct hrtimer_cpu_base *cpu_base = &per_cpu(hrtimer_bases, cpu);
137 SEQ_printf(m, "cpu: %d\n", cpu);
138 for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) {
139 SEQ_printf(m, " clock %d:\n", i);
140 print_base(m, cpu_base->clock_base + i, now);
143 SEQ_printf(m, " .%-15s: %Lu\n", #x, \
144 (unsigned long long)(cpu_base->x))
146 SEQ_printf(m, " .%-15s: %Lu nsecs\n", #x, \
147 (unsigned long long)(ktime_to_ns(cpu_base->x)))
149 #ifdef CONFIG_HIGH_RES_TIMERS
157 #ifdef CONFIG_TICK_ONESHOT
159 SEQ_printf(m, " .%-15s: %Lu\n", #x, \
160 (unsigned long long)(ts->x))
162 SEQ_printf(m, " .%-15s: %Lu nsecs\n", #x, \
163 (unsigned long long)(ktime_to_ns(ts->x)))
165 struct tick_sched *ts = tick_get_tick_sched(cpu);
172 P_ns(idle_entrytime);
175 P_ns(idle_sleeptime);
179 SEQ_printf(m, "jiffies: %Lu\n",
180 (unsigned long long)jiffies);
188 #ifdef CONFIG_GENERIC_CLOCKEVENTS
190 print_tickdevice(struct seq_file *m, struct tick_device *td, int cpu)
192 struct clock_event_device *dev = td->evtdev;
195 SEQ_printf(m, "Tick Device: mode: %d\n", td->mode);
197 SEQ_printf(m, "Broadcast device\n");
199 SEQ_printf(m, "Per CPU device: %d\n", cpu);
201 SEQ_printf(m, "Clock Event Device: ");
203 SEQ_printf(m, "<NULL>\n");
206 SEQ_printf(m, "%s\n", dev->name);
207 SEQ_printf(m, " max_delta_ns: %lu\n", dev->max_delta_ns);
208 SEQ_printf(m, " min_delta_ns: %lu\n", dev->min_delta_ns);
209 SEQ_printf(m, " mult: %lu\n", dev->mult);
210 SEQ_printf(m, " shift: %d\n", dev->shift);
211 SEQ_printf(m, " mode: %d\n", dev->mode);
212 SEQ_printf(m, " next_event: %Ld nsecs\n",
213 (unsigned long long) ktime_to_ns(dev->next_event));
215 SEQ_printf(m, " set_next_event: ");
216 print_name_offset(m, dev->set_next_event);
219 SEQ_printf(m, " set_mode: ");
220 print_name_offset(m, dev->set_mode);
223 SEQ_printf(m, " event_handler: ");
224 print_name_offset(m, dev->event_handler);
228 static void timer_list_show_tickdevices(struct seq_file *m)
232 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
233 print_tickdevice(m, tick_get_broadcast_device(), -1);
234 SEQ_printf(m, "tick_broadcast_mask: %08lx\n",
235 tick_get_broadcast_mask()->bits[0]);
236 #ifdef CONFIG_TICK_ONESHOT
237 SEQ_printf(m, "tick_broadcast_oneshot_mask: %08lx\n",
238 tick_get_broadcast_oneshot_mask()->bits[0]);
242 for_each_online_cpu(cpu)
243 print_tickdevice(m, tick_get_device(cpu), cpu);
247 static void timer_list_show_tickdevices(struct seq_file *m) { }
250 static int timer_list_show(struct seq_file *m, void *v)
252 u64 now = ktime_to_ns(ktime_get());
255 SEQ_printf(m, "Timer List Version: v0.4\n");
256 SEQ_printf(m, "HRTIMER_MAX_CLOCK_BASES: %d\n", HRTIMER_MAX_CLOCK_BASES);
257 SEQ_printf(m, "now at %Ld nsecs\n", (unsigned long long)now);
259 for_each_online_cpu(cpu)
260 print_cpu(m, cpu, now);
263 timer_list_show_tickdevices(m);
268 void sysrq_timer_list_show(void)
270 timer_list_show(NULL, NULL);
273 static int timer_list_open(struct inode *inode, struct file *filp)
275 return single_open(filp, timer_list_show, NULL);
278 static struct file_operations timer_list_fops = {
279 .open = timer_list_open,
282 .release = single_release,
285 static int __init init_timer_list_procfs(void)
287 struct proc_dir_entry *pe;
289 pe = proc_create("timer_list", 0644, NULL, &timer_list_fops);
294 __initcall(init_timer_list_procfs);