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/nmi.h>
21 #include <asm/uaccess.h>
23 #include "tick-internal.h"
25 struct timer_list_iter {
31 typedef void (*print_fn_t)(struct seq_file *m, unsigned int *classes);
34 * This allows printing both to /proc/timer_list and
35 * to the console (on SysRq-Q):
38 static void SEQ_printf(struct seq_file *m, const char *fmt, ...)
45 seq_vprintf(m, fmt, args);
52 static void print_name_offset(struct seq_file *m, void *sym)
54 char symname[KSYM_NAME_LEN];
56 if (lookup_symbol_name((unsigned long)sym, symname) < 0)
57 SEQ_printf(m, "<%pK>", sym);
59 SEQ_printf(m, "%s", symname);
63 print_timer(struct seq_file *m, struct hrtimer *taddr, struct hrtimer *timer,
66 #ifdef CONFIG_TIMER_STATS
67 char tmp[TASK_COMM_LEN + 1];
69 SEQ_printf(m, " #%d: ", idx);
70 print_name_offset(m, taddr);
72 print_name_offset(m, timer->function);
73 SEQ_printf(m, ", S:%02x", timer->state);
74 #ifdef CONFIG_TIMER_STATS
76 print_name_offset(m, timer->start_site);
77 memcpy(tmp, timer->start_comm, TASK_COMM_LEN);
78 tmp[TASK_COMM_LEN] = 0;
79 SEQ_printf(m, ", %s/%d", tmp, timer->start_pid);
82 SEQ_printf(m, " # expires at %Lu-%Lu nsecs [in %Ld to %Ld nsecs]\n",
83 (unsigned long long)ktime_to_ns(hrtimer_get_softexpires(timer)),
84 (unsigned long long)ktime_to_ns(hrtimer_get_expires(timer)),
85 (long long)(ktime_to_ns(hrtimer_get_softexpires(timer)) - now),
86 (long long)(ktime_to_ns(hrtimer_get_expires(timer)) - now));
90 print_active_timers(struct seq_file *m, struct hrtimer_clock_base *base,
93 struct hrtimer *timer, tmp;
94 unsigned long next = 0, i;
95 struct timerqueue_node *curr;
101 touch_nmi_watchdog();
103 raw_spin_lock_irqsave(&base->cpu_base->lock, flags);
105 curr = timerqueue_getnext(&base->active);
107 * Crude but we have to do this O(N*N) thing, because
108 * we have to unlock the base when printing:
110 while (curr && i < next) {
111 curr = timerqueue_iterate_next(curr);
117 timer = container_of(curr, struct hrtimer, node);
119 raw_spin_unlock_irqrestore(&base->cpu_base->lock, flags);
121 print_timer(m, timer, &tmp, i, now);
125 raw_spin_unlock_irqrestore(&base->cpu_base->lock, flags);
129 print_base(struct seq_file *m, struct hrtimer_clock_base *base, u64 now)
131 SEQ_printf(m, " .base: %pK\n", base);
132 SEQ_printf(m, " .index: %d\n", base->index);
134 SEQ_printf(m, " .resolution: %u nsecs\n", (unsigned) hrtimer_resolution);
136 SEQ_printf(m, " .get_time: ");
137 print_name_offset(m, base->get_time);
139 #ifdef CONFIG_HIGH_RES_TIMERS
140 SEQ_printf(m, " .offset: %Lu nsecs\n",
141 (unsigned long long) ktime_to_ns(base->offset));
143 SEQ_printf(m, "active timers:\n");
144 print_active_timers(m, base, now + ktime_to_ns(base->offset));
147 static void print_cpu(struct seq_file *m, int cpu, u64 now)
149 struct hrtimer_cpu_base *cpu_base = &per_cpu(hrtimer_bases, cpu);
152 SEQ_printf(m, "cpu: %d\n", cpu);
153 for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) {
154 SEQ_printf(m, " clock %d:\n", i);
155 print_base(m, cpu_base->clock_base + i, now);
158 SEQ_printf(m, " .%-15s: %Lu\n", #x, \
159 (unsigned long long)(cpu_base->x))
161 SEQ_printf(m, " .%-15s: %Lu nsecs\n", #x, \
162 (unsigned long long)(ktime_to_ns(cpu_base->x)))
164 #ifdef CONFIG_HIGH_RES_TIMERS
175 #ifdef CONFIG_TICK_ONESHOT
177 SEQ_printf(m, " .%-15s: %Lu\n", #x, \
178 (unsigned long long)(ts->x))
180 SEQ_printf(m, " .%-15s: %Lu nsecs\n", #x, \
181 (unsigned long long)(ktime_to_ns(ts->x)))
183 struct tick_sched *ts = tick_get_tick_sched(cpu);
190 P_ns(idle_entrytime);
193 P_ns(idle_sleeptime);
194 P_ns(iowait_sleeptime);
198 SEQ_printf(m, "jiffies: %Lu\n",
199 (unsigned long long)jiffies);
208 #ifdef CONFIG_GENERIC_CLOCKEVENTS
210 print_tickdevice(struct seq_file *m, struct tick_device *td, int cpu)
212 struct clock_event_device *dev = td->evtdev;
214 touch_nmi_watchdog();
216 SEQ_printf(m, "Tick Device: mode: %d\n", td->mode);
218 SEQ_printf(m, "Broadcast device\n");
220 SEQ_printf(m, "Per CPU device: %d\n", cpu);
222 SEQ_printf(m, "Clock Event Device: ");
224 SEQ_printf(m, "<NULL>\n");
227 SEQ_printf(m, "%s\n", dev->name);
228 SEQ_printf(m, " max_delta_ns: %llu\n",
229 (unsigned long long) dev->max_delta_ns);
230 SEQ_printf(m, " min_delta_ns: %llu\n",
231 (unsigned long long) dev->min_delta_ns);
232 SEQ_printf(m, " mult: %u\n", dev->mult);
233 SEQ_printf(m, " shift: %u\n", dev->shift);
234 SEQ_printf(m, " mode: %d\n", clockevent_get_state(dev));
235 SEQ_printf(m, " next_event: %Ld nsecs\n",
236 (unsigned long long) ktime_to_ns(dev->next_event));
238 SEQ_printf(m, " set_next_event: ");
239 print_name_offset(m, dev->set_next_event);
242 if (dev->set_state_shutdown) {
243 SEQ_printf(m, " shutdown: ");
244 print_name_offset(m, dev->set_state_shutdown);
248 if (dev->set_state_periodic) {
249 SEQ_printf(m, " periodic: ");
250 print_name_offset(m, dev->set_state_periodic);
254 if (dev->set_state_oneshot) {
255 SEQ_printf(m, " oneshot: ");
256 print_name_offset(m, dev->set_state_oneshot);
260 if (dev->set_state_oneshot_stopped) {
261 SEQ_printf(m, " oneshot stopped: ");
262 print_name_offset(m, dev->set_state_oneshot_stopped);
266 if (dev->tick_resume) {
267 SEQ_printf(m, " resume: ");
268 print_name_offset(m, dev->tick_resume);
272 SEQ_printf(m, " event_handler: ");
273 print_name_offset(m, dev->event_handler);
275 SEQ_printf(m, " retries: %lu\n", dev->retries);
279 static void timer_list_show_tickdevices_header(struct seq_file *m)
281 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
282 print_tickdevice(m, tick_get_broadcast_device(), -1);
283 SEQ_printf(m, "tick_broadcast_mask: %*pb\n",
284 cpumask_pr_args(tick_get_broadcast_mask()));
285 #ifdef CONFIG_TICK_ONESHOT
286 SEQ_printf(m, "tick_broadcast_oneshot_mask: %*pb\n",
287 cpumask_pr_args(tick_get_broadcast_oneshot_mask()));
294 static inline void timer_list_header(struct seq_file *m, u64 now)
296 SEQ_printf(m, "Timer List Version: v0.8\n");
297 SEQ_printf(m, "HRTIMER_MAX_CLOCK_BASES: %d\n", HRTIMER_MAX_CLOCK_BASES);
298 SEQ_printf(m, "now at %Ld nsecs\n", (unsigned long long)now);
302 void sysrq_timer_list_show(void)
304 u64 now = ktime_to_ns(ktime_get());
307 timer_list_header(NULL, now);
309 for_each_online_cpu(cpu)
310 print_cpu(NULL, cpu, now);
312 #ifdef CONFIG_GENERIC_CLOCKEVENTS
313 timer_list_show_tickdevices_header(NULL);
314 for_each_online_cpu(cpu)
315 print_tickdevice(NULL, tick_get_device(cpu), cpu);
320 #ifdef CONFIG_PROC_FS
321 static int timer_list_show(struct seq_file *m, void *v)
323 struct timer_list_iter *iter = v;
325 if (iter->cpu == -1 && !iter->second_pass)
326 timer_list_header(m, iter->now);
327 else if (!iter->second_pass)
328 print_cpu(m, iter->cpu, iter->now);
329 #ifdef CONFIG_GENERIC_CLOCKEVENTS
330 else if (iter->cpu == -1 && iter->second_pass)
331 timer_list_show_tickdevices_header(m);
333 print_tickdevice(m, tick_get_device(iter->cpu), iter->cpu);
338 static void *move_iter(struct timer_list_iter *iter, loff_t offset)
340 for (; offset; offset--) {
341 iter->cpu = cpumask_next(iter->cpu, cpu_online_mask);
342 if (iter->cpu >= nr_cpu_ids) {
343 #ifdef CONFIG_GENERIC_CLOCKEVENTS
344 if (!iter->second_pass) {
346 iter->second_pass = true;
357 static void *timer_list_start(struct seq_file *file, loff_t *offset)
359 struct timer_list_iter *iter = file->private;
362 iter->now = ktime_to_ns(ktime_get());
364 iter->second_pass = false;
365 return move_iter(iter, *offset);
368 static void *timer_list_next(struct seq_file *file, void *v, loff_t *offset)
370 struct timer_list_iter *iter = file->private;
372 return move_iter(iter, 1);
375 static void timer_list_stop(struct seq_file *seq, void *v)
379 static const struct seq_operations timer_list_sops = {
380 .start = timer_list_start,
381 .next = timer_list_next,
382 .stop = timer_list_stop,
383 .show = timer_list_show,
386 static int timer_list_open(struct inode *inode, struct file *filp)
388 return seq_open_private(filp, &timer_list_sops,
389 sizeof(struct timer_list_iter));
392 static const struct file_operations timer_list_fops = {
393 .open = timer_list_open,
396 .release = seq_release_private,
399 static int __init init_timer_list_procfs(void)
401 struct proc_dir_entry *pe;
403 pe = proc_create("timer_list", 0400, NULL, &timer_list_fops);
408 __initcall(init_timer_list_procfs);