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 *timer, int idx, u64 now)
52 #ifdef CONFIG_TIMER_STATS
53 char tmp[TASK_COMM_LEN + 1];
55 SEQ_printf(m, " #%d: ", idx);
56 print_name_offset(m, timer);
58 print_name_offset(m, timer->function);
59 SEQ_printf(m, ", S:%02lx", timer->state);
60 #ifdef CONFIG_TIMER_STATS
62 print_name_offset(m, timer->start_site);
63 memcpy(tmp, timer->start_comm, TASK_COMM_LEN);
64 tmp[TASK_COMM_LEN] = 0;
65 SEQ_printf(m, ", %s/%d", tmp, timer->start_pid);
68 SEQ_printf(m, " # expires at %Lu-%Lu nsecs [in %Ld to %Ld nsecs]\n",
69 (unsigned long long)ktime_to_ns(hrtimer_get_softexpires(timer)),
70 (unsigned long long)ktime_to_ns(hrtimer_get_expires(timer)),
71 (long long)(ktime_to_ns(hrtimer_get_softexpires(timer)) - now),
72 (long long)(ktime_to_ns(hrtimer_get_expires(timer)) - now));
76 print_active_timers(struct seq_file *m, struct hrtimer_clock_base *base,
79 struct hrtimer *timer, tmp;
80 unsigned long next = 0, i;
86 spin_lock_irqsave(&base->cpu_base->lock, flags);
90 * Crude but we have to do this O(N*N) thing, because
91 * we have to unlock the base when printing:
93 while (curr && i < next) {
100 timer = rb_entry(curr, struct hrtimer, node);
102 spin_unlock_irqrestore(&base->cpu_base->lock, flags);
104 print_timer(m, &tmp, i, now);
108 spin_unlock_irqrestore(&base->cpu_base->lock, flags);
112 print_base(struct seq_file *m, struct hrtimer_clock_base *base, u64 now)
114 SEQ_printf(m, " .index: %d\n",
116 SEQ_printf(m, " .resolution: %Lu nsecs\n",
117 (unsigned long long)ktime_to_ns(base->resolution));
118 SEQ_printf(m, " .get_time: ");
119 print_name_offset(m, base->get_time);
121 #ifdef CONFIG_HIGH_RES_TIMERS
122 SEQ_printf(m, " .offset: %Lu nsecs\n",
123 (unsigned long long) ktime_to_ns(base->offset));
125 SEQ_printf(m, "active timers:\n");
126 print_active_timers(m, base, now);
129 static void print_cpu(struct seq_file *m, int cpu, u64 now)
131 struct hrtimer_cpu_base *cpu_base = &per_cpu(hrtimer_bases, cpu);
135 SEQ_printf(m, "cpu: %d\n", cpu);
136 for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) {
137 SEQ_printf(m, " clock %d:\n", i);
138 print_base(m, cpu_base->clock_base + i, now);
141 SEQ_printf(m, " .%-15s: %Lu\n", #x, \
142 (unsigned long long)(cpu_base->x))
144 SEQ_printf(m, " .%-15s: %Lu nsecs\n", #x, \
145 (unsigned long long)(ktime_to_ns(cpu_base->x)))
147 #ifdef CONFIG_HIGH_RES_TIMERS
155 #ifdef CONFIG_TICK_ONESHOT
157 SEQ_printf(m, " .%-15s: %Lu\n", #x, \
158 (unsigned long long)(ts->x))
160 SEQ_printf(m, " .%-15s: %Lu nsecs\n", #x, \
161 (unsigned long long)(ktime_to_ns(ts->x)))
163 struct tick_sched *ts = tick_get_tick_sched(cpu);
170 P_ns(idle_entrytime);
173 P_ns(idle_sleeptime);
177 SEQ_printf(m, "jiffies: %Lu\n",
178 (unsigned long long)jiffies);
186 #ifdef CONFIG_GENERIC_CLOCKEVENTS
188 print_tickdevice(struct seq_file *m, struct tick_device *td)
190 struct clock_event_device *dev = td->evtdev;
193 SEQ_printf(m, "Tick Device: mode: %d\n", td->mode);
195 SEQ_printf(m, "Clock Event Device: ");
197 SEQ_printf(m, "<NULL>\n");
200 SEQ_printf(m, "%s\n", dev->name);
201 SEQ_printf(m, " max_delta_ns: %lu\n", dev->max_delta_ns);
202 SEQ_printf(m, " min_delta_ns: %lu\n", dev->min_delta_ns);
203 SEQ_printf(m, " mult: %lu\n", dev->mult);
204 SEQ_printf(m, " shift: %d\n", dev->shift);
205 SEQ_printf(m, " mode: %d\n", dev->mode);
206 SEQ_printf(m, " next_event: %Ld nsecs\n",
207 (unsigned long long) ktime_to_ns(dev->next_event));
209 SEQ_printf(m, " set_next_event: ");
210 print_name_offset(m, dev->set_next_event);
213 SEQ_printf(m, " set_mode: ");
214 print_name_offset(m, dev->set_mode);
217 SEQ_printf(m, " event_handler: ");
218 print_name_offset(m, dev->event_handler);
222 static void timer_list_show_tickdevices(struct seq_file *m)
226 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
227 print_tickdevice(m, tick_get_broadcast_device());
228 SEQ_printf(m, "tick_broadcast_mask: %08lx\n",
229 tick_get_broadcast_mask()->bits[0]);
230 #ifdef CONFIG_TICK_ONESHOT
231 SEQ_printf(m, "tick_broadcast_oneshot_mask: %08lx\n",
232 tick_get_broadcast_oneshot_mask()->bits[0]);
236 for_each_online_cpu(cpu)
237 print_tickdevice(m, tick_get_device(cpu));
241 static void timer_list_show_tickdevices(struct seq_file *m) { }
244 static int timer_list_show(struct seq_file *m, void *v)
246 u64 now = ktime_to_ns(ktime_get());
249 SEQ_printf(m, "Timer List Version: v0.3\n");
250 SEQ_printf(m, "HRTIMER_MAX_CLOCK_BASES: %d\n", HRTIMER_MAX_CLOCK_BASES);
251 SEQ_printf(m, "now at %Ld nsecs\n", (unsigned long long)now);
253 for_each_online_cpu(cpu)
254 print_cpu(m, cpu, now);
257 timer_list_show_tickdevices(m);
262 void sysrq_timer_list_show(void)
264 timer_list_show(NULL, NULL);
267 static int timer_list_open(struct inode *inode, struct file *filp)
269 return single_open(filp, timer_list_show, NULL);
272 static struct file_operations timer_list_fops = {
273 .open = timer_list_open,
276 .release = single_release,
279 static int __init init_timer_list_procfs(void)
281 struct proc_dir_entry *pe;
283 pe = proc_create("timer_list", 0644, NULL, &timer_list_fops);
288 __initcall(init_timer_list_procfs);