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>
20 #include <linux/uaccess.h>
22 #include "tick-internal.h"
24 struct timer_list_iter {
30 typedef void (*print_fn_t)(struct seq_file *m, unsigned int *classes);
33 * This allows printing both to /proc/timer_list and
34 * to the console (on SysRq-Q):
37 static void SEQ_printf(struct seq_file *m, const char *fmt, ...)
44 seq_vprintf(m, fmt, args);
51 static void print_name_offset(struct seq_file *m, void *sym)
53 char symname[KSYM_NAME_LEN];
55 if (lookup_symbol_name((unsigned long)sym, symname) < 0)
56 SEQ_printf(m, "<%pK>", sym);
58 SEQ_printf(m, "%s", symname);
62 print_timer(struct seq_file *m, struct hrtimer *taddr, struct hrtimer *timer,
65 SEQ_printf(m, " #%d: ", idx);
66 print_name_offset(m, taddr);
68 print_name_offset(m, timer->function);
69 SEQ_printf(m, ", S:%02x", timer->state);
71 SEQ_printf(m, " # expires at %Lu-%Lu nsecs [in %Ld to %Ld nsecs]\n",
72 (unsigned long long)ktime_to_ns(hrtimer_get_softexpires(timer)),
73 (unsigned long long)ktime_to_ns(hrtimer_get_expires(timer)),
74 (long long)(ktime_to_ns(hrtimer_get_softexpires(timer)) - now),
75 (long long)(ktime_to_ns(hrtimer_get_expires(timer)) - now));
79 print_active_timers(struct seq_file *m, struct hrtimer_clock_base *base,
82 struct hrtimer *timer, tmp;
83 unsigned long next = 0, i;
84 struct timerqueue_node *curr;
89 raw_spin_lock_irqsave(&base->cpu_base->lock, flags);
91 curr = timerqueue_getnext(&base->active);
93 * Crude but we have to do this O(N*N) thing, because
94 * we have to unlock the base when printing:
96 while (curr && i < next) {
97 curr = timerqueue_iterate_next(curr);
103 timer = container_of(curr, struct hrtimer, node);
105 raw_spin_unlock_irqrestore(&base->cpu_base->lock, flags);
107 print_timer(m, timer, &tmp, i, now);
111 raw_spin_unlock_irqrestore(&base->cpu_base->lock, flags);
115 print_base(struct seq_file *m, struct hrtimer_clock_base *base, u64 now)
117 SEQ_printf(m, " .base: %pK\n", base);
118 SEQ_printf(m, " .index: %d\n", base->index);
120 SEQ_printf(m, " .resolution: %u nsecs\n", hrtimer_resolution);
122 SEQ_printf(m, " .get_time: ");
123 print_name_offset(m, base->get_time);
125 #ifdef CONFIG_HIGH_RES_TIMERS
126 SEQ_printf(m, " .offset: %Lu nsecs\n",
127 (unsigned long long) ktime_to_ns(base->offset));
129 SEQ_printf(m, "active timers:\n");
130 print_active_timers(m, base, now + ktime_to_ns(base->offset));
133 static void print_cpu(struct seq_file *m, int cpu, u64 now)
135 struct hrtimer_cpu_base *cpu_base = &per_cpu(hrtimer_bases, cpu);
138 SEQ_printf(m, "cpu: %d\n", cpu);
139 for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) {
140 SEQ_printf(m, " clock %d:\n", i);
141 print_base(m, cpu_base->clock_base + i, now);
144 SEQ_printf(m, " .%-15s: %Lu\n", #x, \
145 (unsigned long long)(cpu_base->x))
147 SEQ_printf(m, " .%-15s: %Lu nsecs\n", #x, \
148 (unsigned long long)(ktime_to_ns(cpu_base->x)))
150 #ifdef CONFIG_HIGH_RES_TIMERS
161 #ifdef CONFIG_TICK_ONESHOT
163 SEQ_printf(m, " .%-15s: %Lu\n", #x, \
164 (unsigned long long)(ts->x))
166 SEQ_printf(m, " .%-15s: %Lu nsecs\n", #x, \
167 (unsigned long long)(ktime_to_ns(ts->x)))
169 struct tick_sched *ts = tick_get_tick_sched(cpu);
176 P_ns(idle_entrytime);
179 P_ns(idle_sleeptime);
180 P_ns(iowait_sleeptime);
184 SEQ_printf(m, "jiffies: %Lu\n",
185 (unsigned long long)jiffies);
194 #ifdef CONFIG_GENERIC_CLOCKEVENTS
196 print_tickdevice(struct seq_file *m, struct tick_device *td, int cpu)
198 struct clock_event_device *dev = td->evtdev;
200 SEQ_printf(m, "Tick Device: mode: %d\n", td->mode);
202 SEQ_printf(m, "Broadcast device\n");
204 SEQ_printf(m, "Per CPU device: %d\n", cpu);
206 SEQ_printf(m, "Clock Event Device: ");
208 SEQ_printf(m, "<NULL>\n");
211 SEQ_printf(m, "%s\n", dev->name);
212 SEQ_printf(m, " max_delta_ns: %llu\n",
213 (unsigned long long) dev->max_delta_ns);
214 SEQ_printf(m, " min_delta_ns: %llu\n",
215 (unsigned long long) dev->min_delta_ns);
216 SEQ_printf(m, " mult: %u\n", dev->mult);
217 SEQ_printf(m, " shift: %u\n", dev->shift);
218 SEQ_printf(m, " mode: %d\n", clockevent_get_state(dev));
219 SEQ_printf(m, " next_event: %Ld nsecs\n",
220 (unsigned long long) ktime_to_ns(dev->next_event));
222 SEQ_printf(m, " set_next_event: ");
223 print_name_offset(m, dev->set_next_event);
226 if (dev->set_state_shutdown) {
227 SEQ_printf(m, " shutdown: ");
228 print_name_offset(m, dev->set_state_shutdown);
232 if (dev->set_state_periodic) {
233 SEQ_printf(m, " periodic: ");
234 print_name_offset(m, dev->set_state_periodic);
238 if (dev->set_state_oneshot) {
239 SEQ_printf(m, " oneshot: ");
240 print_name_offset(m, dev->set_state_oneshot);
244 if (dev->set_state_oneshot_stopped) {
245 SEQ_printf(m, " oneshot stopped: ");
246 print_name_offset(m, dev->set_state_oneshot_stopped);
250 if (dev->tick_resume) {
251 SEQ_printf(m, " resume: ");
252 print_name_offset(m, dev->tick_resume);
256 SEQ_printf(m, " event_handler: ");
257 print_name_offset(m, dev->event_handler);
259 SEQ_printf(m, " retries: %lu\n", dev->retries);
263 static void timer_list_show_tickdevices_header(struct seq_file *m)
265 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
266 print_tickdevice(m, tick_get_broadcast_device(), -1);
267 SEQ_printf(m, "tick_broadcast_mask: %*pb\n",
268 cpumask_pr_args(tick_get_broadcast_mask()));
269 #ifdef CONFIG_TICK_ONESHOT
270 SEQ_printf(m, "tick_broadcast_oneshot_mask: %*pb\n",
271 cpumask_pr_args(tick_get_broadcast_oneshot_mask()));
278 static inline void timer_list_header(struct seq_file *m, u64 now)
280 SEQ_printf(m, "Timer List Version: v0.8\n");
281 SEQ_printf(m, "HRTIMER_MAX_CLOCK_BASES: %d\n", HRTIMER_MAX_CLOCK_BASES);
282 SEQ_printf(m, "now at %Ld nsecs\n", (unsigned long long)now);
286 static int timer_list_show(struct seq_file *m, void *v)
288 struct timer_list_iter *iter = v;
290 if (iter->cpu == -1 && !iter->second_pass)
291 timer_list_header(m, iter->now);
292 else if (!iter->second_pass)
293 print_cpu(m, iter->cpu, iter->now);
294 #ifdef CONFIG_GENERIC_CLOCKEVENTS
295 else if (iter->cpu == -1 && iter->second_pass)
296 timer_list_show_tickdevices_header(m);
298 print_tickdevice(m, tick_get_device(iter->cpu), iter->cpu);
303 void sysrq_timer_list_show(void)
305 u64 now = ktime_to_ns(ktime_get());
308 timer_list_header(NULL, now);
310 for_each_online_cpu(cpu)
311 print_cpu(NULL, cpu, now);
313 #ifdef CONFIG_GENERIC_CLOCKEVENTS
314 timer_list_show_tickdevices_header(NULL);
315 for_each_online_cpu(cpu)
316 print_tickdevice(NULL, tick_get_device(cpu), cpu);
321 static void *move_iter(struct timer_list_iter *iter, loff_t offset)
323 for (; offset; offset--) {
324 iter->cpu = cpumask_next(iter->cpu, cpu_online_mask);
325 if (iter->cpu >= nr_cpu_ids) {
326 #ifdef CONFIG_GENERIC_CLOCKEVENTS
327 if (!iter->second_pass) {
329 iter->second_pass = true;
340 static void *timer_list_start(struct seq_file *file, loff_t *offset)
342 struct timer_list_iter *iter = file->private;
345 iter->now = ktime_to_ns(ktime_get());
347 iter->second_pass = false;
348 return move_iter(iter, *offset);
351 static void *timer_list_next(struct seq_file *file, void *v, loff_t *offset)
353 struct timer_list_iter *iter = file->private;
355 return move_iter(iter, 1);
358 static void timer_list_stop(struct seq_file *seq, void *v)
362 static const struct seq_operations timer_list_sops = {
363 .start = timer_list_start,
364 .next = timer_list_next,
365 .stop = timer_list_stop,
366 .show = timer_list_show,
369 static int timer_list_open(struct inode *inode, struct file *filp)
371 return seq_open_private(filp, &timer_list_sops,
372 sizeof(struct timer_list_iter));
375 static const struct file_operations timer_list_fops = {
376 .open = timer_list_open,
379 .release = seq_release_private,
382 static int __init init_timer_list_procfs(void)
384 struct proc_dir_entry *pe;
386 pe = proc_create("timer_list", 0444, NULL, &timer_list_fops);
391 __initcall(init_timer_list_procfs);