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 nsecs [in %Ld nsecs]\n",
70 (unsigned long long)ktime_to_ns(timer
->expires
),
71 (long long)(ktime_to_ns(timer
->expires
) - now
));
75 print_active_timers(struct seq_file
*m
, struct hrtimer_clock_base
*base
,
78 struct hrtimer
*timer
, tmp
;
79 unsigned long next
= 0, i
;
85 spin_lock_irqsave(&base
->cpu_base
->lock
, flags
);
89 * Crude but we have to do this O(N*N) thing, because
90 * we have to unlock the base when printing:
92 while (curr
&& i
< next
) {
99 timer
= rb_entry(curr
, struct hrtimer
, node
);
101 spin_unlock_irqrestore(&base
->cpu_base
->lock
, flags
);
103 print_timer(m
, timer
, &tmp
, i
, now
);
107 spin_unlock_irqrestore(&base
->cpu_base
->lock
, flags
);
111 print_base(struct seq_file
*m
, struct hrtimer_clock_base
*base
, u64 now
)
113 SEQ_printf(m
, " .base: %p\n", base
);
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
, int cpu
)
190 struct clock_event_device
*dev
= td
->evtdev
;
193 SEQ_printf(m
, "Tick Device: mode: %d\n", td
->mode
);
195 SEQ_printf(m
, "Broadcast device\n");
197 SEQ_printf(m
, "Per CPU device: %d\n", cpu
);
199 SEQ_printf(m
, "Clock Event Device: ");
201 SEQ_printf(m
, "<NULL>\n");
204 SEQ_printf(m
, "%s\n", dev
->name
);
205 SEQ_printf(m
, " max_delta_ns: %lu\n", dev
->max_delta_ns
);
206 SEQ_printf(m
, " min_delta_ns: %lu\n", dev
->min_delta_ns
);
207 SEQ_printf(m
, " mult: %lu\n", dev
->mult
);
208 SEQ_printf(m
, " shift: %d\n", dev
->shift
);
209 SEQ_printf(m
, " mode: %d\n", dev
->mode
);
210 SEQ_printf(m
, " next_event: %Ld nsecs\n",
211 (unsigned long long) ktime_to_ns(dev
->next_event
));
213 SEQ_printf(m
, " set_next_event: ");
214 print_name_offset(m
, dev
->set_next_event
);
217 SEQ_printf(m
, " set_mode: ");
218 print_name_offset(m
, dev
->set_mode
);
221 SEQ_printf(m
, " event_handler: ");
222 print_name_offset(m
, dev
->event_handler
);
226 static void timer_list_show_tickdevices(struct seq_file
*m
)
230 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
231 print_tickdevice(m
, tick_get_broadcast_device(), -1);
232 SEQ_printf(m
, "tick_broadcast_mask: %08lx\n",
233 tick_get_broadcast_mask()->bits
[0]);
234 #ifdef CONFIG_TICK_ONESHOT
235 SEQ_printf(m
, "tick_broadcast_oneshot_mask: %08lx\n",
236 tick_get_broadcast_oneshot_mask()->bits
[0]);
240 for_each_online_cpu(cpu
)
241 print_tickdevice(m
, tick_get_device(cpu
), cpu
);
245 static void timer_list_show_tickdevices(struct seq_file
*m
) { }
248 static int timer_list_show(struct seq_file
*m
, void *v
)
250 u64 now
= ktime_to_ns(ktime_get());
253 SEQ_printf(m
, "Timer List Version: v0.4\n");
254 SEQ_printf(m
, "HRTIMER_MAX_CLOCK_BASES: %d\n", HRTIMER_MAX_CLOCK_BASES
);
255 SEQ_printf(m
, "now at %Ld nsecs\n", (unsigned long long)now
);
257 for_each_online_cpu(cpu
)
258 print_cpu(m
, cpu
, now
);
261 timer_list_show_tickdevices(m
);
266 void sysrq_timer_list_show(void)
268 timer_list_show(NULL
, NULL
);
271 static int timer_list_open(struct inode
*inode
, struct file
*filp
)
273 return single_open(filp
, timer_list_show
, NULL
);
276 static struct file_operations timer_list_fops
= {
277 .open
= timer_list_open
,
280 .release
= single_release
,
283 static int __init
init_timer_list_procfs(void)
285 struct proc_dir_entry
*pe
;
287 pe
= proc_create("timer_list", 0644, NULL
, &timer_list_fops
);
292 __initcall(init_timer_list_procfs
);