[net-next-2.6.git] / kernel / time / timer_list.c

/*
 * kernel/time/timer_list.c
 *
 * List pending timers
 *
 * Copyright(C) 2006, Red Hat, Inc., Ingo Molnar
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/proc_fs.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/sched.h>
#include <linux/seq_file.h>
#include <linux/kallsyms.h>
#include <linux/tick.h>

#include <asm/uaccess.h>

typedef void (*print_fn_t)(struct seq_file *m, unsigned int *classes);

DECLARE_PER_CPU(struct hrtimer_cpu_base, hrtimer_bases);

/*
 * This allows printing both to /proc/timer_list and
 * to the console (on SysRq-Q):
 */
#define SEQ_printf(m, x...)			\
 do {						\
	if (m)					\
		seq_printf(m, x);		\
	else					\
		printk(x);			\
 } while (0)

static void print_name_offset(struct seq_file *m, void *sym)
{
	char symname[KSYM_NAME_LEN];

	if (lookup_symbol_name((unsigned long)sym, symname) < 0)
		SEQ_printf(m, "<%p>", sym);
	else
		SEQ_printf(m, "%s", symname);
}

static void
print_timer(struct seq_file *m, struct hrtimer *taddr, struct hrtimer *timer,
	    int idx, u64 now)
{
#ifdef CONFIG_TIMER_STATS
	char tmp[TASK_COMM_LEN + 1];
#endif
	SEQ_printf(m, " #%d: ", idx);
	print_name_offset(m, taddr);
	SEQ_printf(m, ", ");
	print_name_offset(m, timer->function);
	SEQ_printf(m, ", S:%02lx", timer->state);
#ifdef CONFIG_TIMER_STATS
	SEQ_printf(m, ", ");
	print_name_offset(m, timer->start_site);
	memcpy(tmp, timer->start_comm, TASK_COMM_LEN);
	tmp[TASK_COMM_LEN] = 0;
	SEQ_printf(m, ", %s/%d", tmp, timer->start_pid);
#endif
	SEQ_printf(m, "\n");
	SEQ_printf(m, " # expires at %Lu-%Lu nsecs [in %Ld to %Ld nsecs]\n",
		(unsigned long long)ktime_to_ns(hrtimer_get_softexpires(timer)),
		(unsigned long long)ktime_to_ns(hrtimer_get_expires(timer)),
		(long long)(ktime_to_ns(hrtimer_get_softexpires(timer)) - now),
		(long long)(ktime_to_ns(hrtimer_get_expires(timer)) - now));
}

static void
print_active_timers(struct seq_file *m, struct hrtimer_clock_base *base,
		    u64 now)
{
	struct hrtimer *timer, tmp;
	unsigned long next = 0, i;
	struct rb_node *curr;
	unsigned long flags;

next_one:
	i = 0;
	raw_spin_lock_irqsave(&base->cpu_base->lock, flags);

	curr = base->first;
	/*
	 * Crude but we have to do this O(N*N) thing, because
	 * we have to unlock the base when printing:
	 */
	while (curr && i < next) {
		curr = rb_next(curr);
		i++;
	}

	if (curr) {

		timer = rb_entry(curr, struct hrtimer, node);
		tmp = *timer;
		raw_spin_unlock_irqrestore(&base->cpu_base->lock, flags);

		print_timer(m, timer, &tmp, i, now);
		next++;
		goto next_one;
	}
	raw_spin_unlock_irqrestore(&base->cpu_base->lock, flags);
}

static void
print_base(struct seq_file *m, struct hrtimer_clock_base *base, u64 now)
{
	SEQ_printf(m, "  .base:       %p\n", base);
	SEQ_printf(m, "  .index:      %d\n",
			base->index);
	SEQ_printf(m, "  .resolution: %Lu nsecs\n",
			(unsigned long long)ktime_to_ns(base->resolution));
	SEQ_printf(m,   "  .get_time:   ");
	print_name_offset(m, base->get_time);
	SEQ_printf(m,   "\n");
#ifdef CONFIG_HIGH_RES_TIMERS
	SEQ_printf(m, "  .offset:     %Lu nsecs\n",
		   (unsigned long long) ktime_to_ns(base->offset));
#endif
	SEQ_printf(m,   "active timers:\n");
	print_active_timers(m, base, now);
}

static void print_cpu(struct seq_file *m, int cpu, u64 now)
{
	struct hrtimer_cpu_base *cpu_base = &per_cpu(hrtimer_bases, cpu);
	int i;

	SEQ_printf(m, "\n");
	SEQ_printf(m, "cpu: %d\n", cpu);
	for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) {
		SEQ_printf(m, " clock %d:\n", i);
		print_base(m, cpu_base->clock_base + i, now);
	}
#define P(x) \
	SEQ_printf(m, "  .%-15s: %Lu\n", #x, \
		   (unsigned long long)(cpu_base->x))
#define P_ns(x) \
	SEQ_printf(m, "  .%-15s: %Lu nsecs\n", #x, \
		   (unsigned long long)(ktime_to_ns(cpu_base->x)))

#ifdef CONFIG_HIGH_RES_TIMERS
	P_ns(expires_next);
	P(hres_active);
	P(nr_events);
	P(nr_retries);
	P(nr_hangs);
	P_ns(max_hang_time);
#endif
#undef P
#undef P_ns

#ifdef CONFIG_TICK_ONESHOT
# define P(x) \
	SEQ_printf(m, "  .%-15s: %Lu\n", #x, \
		   (unsigned long long)(ts->x))
# define P_ns(x) \
	SEQ_printf(m, "  .%-15s: %Lu nsecs\n", #x, \
		   (unsigned long long)(ktime_to_ns(ts->x)))
	{
		struct tick_sched *ts = tick_get_tick_sched(cpu);
		P(nohz_mode);
		P_ns(idle_tick);
		P(tick_stopped);
		P(idle_jiffies);
		P(idle_calls);
		P(idle_sleeps);
		P_ns(idle_entrytime);
		P_ns(idle_waketime);
		P_ns(idle_exittime);
		P_ns(idle_sleeptime);
		P_ns(iowait_sleeptime);
		P(last_jiffies);
		P(next_jiffies);
		P_ns(idle_expires);
		SEQ_printf(m, "jiffies: %Lu\n",
			   (unsigned long long)jiffies);
	}
#endif

#undef P
#undef P_ns
}

#ifdef CONFIG_GENERIC_CLOCKEVENTS
static void
print_tickdevice(struct seq_file *m, struct tick_device *td, int cpu)
{
	struct clock_event_device *dev = td->evtdev;

	SEQ_printf(m, "\n");
	SEQ_printf(m, "Tick Device: mode:     %d\n", td->mode);
	if (cpu < 0)
		SEQ_printf(m, "Broadcast device\n");
	else
		SEQ_printf(m, "Per CPU device: %d\n", cpu);

	SEQ_printf(m, "Clock Event Device: ");
	if (!dev) {
		SEQ_printf(m, "<NULL>\n");
		return;
	}
	SEQ_printf(m, "%s\n", dev->name);
	SEQ_printf(m, " max_delta_ns:   %llu\n",
		   (unsigned long long) dev->max_delta_ns);
	SEQ_printf(m, " min_delta_ns:   %llu\n",
		   (unsigned long long) dev->min_delta_ns);
	SEQ_printf(m, " mult:           %u\n", dev->mult);
	SEQ_printf(m, " shift:          %u\n", dev->shift);
	SEQ_printf(m, " mode:           %d\n", dev->mode);
	SEQ_printf(m, " next_event:     %Ld nsecs\n",
		   (unsigned long long) ktime_to_ns(dev->next_event));

	SEQ_printf(m, " set_next_event: ");
	print_name_offset(m, dev->set_next_event);
	SEQ_printf(m, "\n");

	SEQ_printf(m, " set_mode:       ");
	print_name_offset(m, dev->set_mode);
	SEQ_printf(m, "\n");

	SEQ_printf(m, " event_handler:  ");
	print_name_offset(m, dev->event_handler);
	SEQ_printf(m, "\n");
	SEQ_printf(m, " retries:        %lu\n", dev->retries);
}

static void timer_list_show_tickdevices(struct seq_file *m)
{
	int cpu;

#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
	print_tickdevice(m, tick_get_broadcast_device(), -1);
	SEQ_printf(m, "tick_broadcast_mask: %08lx\n",
		   cpumask_bits(tick_get_broadcast_mask())[0]);
#ifdef CONFIG_TICK_ONESHOT
	SEQ_printf(m, "tick_broadcast_oneshot_mask: %08lx\n",
		   cpumask_bits(tick_get_broadcast_oneshot_mask())[0]);
#endif
	SEQ_printf(m, "\n");
#endif
	for_each_online_cpu(cpu)
		print_tickdevice(m, tick_get_device(cpu), cpu);
	SEQ_printf(m, "\n");
}
#else
static void timer_list_show_tickdevices(struct seq_file *m) { }
#endif

static int timer_list_show(struct seq_file *m, void *v)
{
	u64 now = ktime_to_ns(ktime_get());
	int cpu;

	SEQ_printf(m, "Timer List Version: v0.6\n");
	SEQ_printf(m, "HRTIMER_MAX_CLOCK_BASES: %d\n", HRTIMER_MAX_CLOCK_BASES);
	SEQ_printf(m, "now at %Ld nsecs\n", (unsigned long long)now);

	for_each_online_cpu(cpu)
		print_cpu(m, cpu, now);

	SEQ_printf(m, "\n");
	timer_list_show_tickdevices(m);

	return 0;
}

void sysrq_timer_list_show(void)
{
	timer_list_show(NULL, NULL);
}

static int timer_list_open(struct inode *inode, struct file *filp)
{
	return single_open(filp, timer_list_show, NULL);
}

static const struct file_operations timer_list_fops = {
	.open		= timer_list_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static int __init init_timer_list_procfs(void)
{
	struct proc_dir_entry *pe;

	pe = proc_create("timer_list", 0444, NULL, &timer_list_fops);
	if (!pe)
		return -ENOMEM;
	return 0;
}
__initcall(init_timer_list_procfs);
Commit	Line	Data
289f480a IM	1	/*
	2	* kernel/time/timer_list.c
	3	*
	4	* List pending timers
	5	*
	6	* Copyright(C) 2006, Red Hat, Inc., Ingo Molnar
	7	*
	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.
	11	*/
	12
	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>
	20
	21	#include <asm/uaccess.h>
	22
	23	typedef void (print_fn_t)(struct seq_file m, unsigned int *classes);
	24
	25	DECLARE_PER_CPU(struct hrtimer_cpu_base, hrtimer_bases);
	26
	27	/*
	28	* This allows printing both to /proc/timer_list and
	29	* to the console (on SysRq-Q):
	30	*/
	31	#define SEQ_printf(m, x...) \
	32	do { \
	33	if (m) \
	34	seq_printf(m, x); \
	35	else \
	36	printk(x); \
	37	} while (0)
	38
	39	static void print_name_offset(struct seq_file m, void sym)
	40	{
9281acea	41	char symname[KSYM_NAME_LEN];
289f480a	42
9d65cb4a	43	if (lookup_symbol_name((unsigned long)sym, symname) < 0)
289f480a	44	SEQ_printf(m, "<%p>", sym);
9d65cb4a AD	45	else
9d65cb4a AD	46	SEQ_printf(m, "%s", symname);
289f480a IM	47	}
	48
	49	static void
e67ef25a TG	50	print_timer(struct seq_file m, struct hrtimer taddr, struct hrtimer *timer,
e67ef25a TG	51	int idx, u64 now)
289f480a IM	52	{
	53	#ifdef CONFIG_TIMER_STATS
	54	char tmp[TASK_COMM_LEN + 1];
	55	#endif
	56	SEQ_printf(m, " #%d: ", idx);
e67ef25a	57	print_name_offset(m, taddr);
289f480a IM	58	SEQ_printf(m, ", ");
	59	print_name_offset(m, timer->function);
	60	SEQ_printf(m, ", S:%02lx", timer->state);
	61	#ifdef CONFIG_TIMER_STATS
	62	SEQ_printf(m, ", ");
	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);
	67	#endif
	68	SEQ_printf(m, "\n");
704af52b AV	69	SEQ_printf(m, " # expires at %Lu-%Lu nsecs [in %Ld to %Ld nsecs]\n",
704af52b AV	70	(unsigned long long)ktime_to_ns(hrtimer_get_softexpires(timer)),
cc584b21	71	(unsigned long long)ktime_to_ns(hrtimer_get_expires(timer)),
704af52b	72	(long long)(ktime_to_ns(hrtimer_get_softexpires(timer)) - now),
cc584b21	73	(long long)(ktime_to_ns(hrtimer_get_expires(timer)) - now));
289f480a IM	74	}
	75
	76	static void
	77	print_active_timers(struct seq_file m, struct hrtimer_clock_base base,
	78	u64 now)
	79	{
	80	struct hrtimer *timer, tmp;
	81	unsigned long next = 0, i;
	82	struct rb_node *curr;
	83	unsigned long flags;
	84
	85	next_one:
	86	i = 0;
ecb49d1a	87	raw_spin_lock_irqsave(&base->cpu_base->lock, flags);
289f480a IM	88
	89	curr = base->first;
	90	/*
	91	* Crude but we have to do this O(N*N) thing, because
	92	* we have to unlock the base when printing:
	93	*/
	94	while (curr && i < next) {
	95	curr = rb_next(curr);
	96	i++;
	97	}
	98
	99	if (curr) {
	100
	101	timer = rb_entry(curr, struct hrtimer, node);
	102	tmp = *timer;
ecb49d1a	103	raw_spin_unlock_irqrestore(&base->cpu_base->lock, flags);
289f480a	104
e67ef25a	105	print_timer(m, timer, &tmp, i, now);
289f480a IM	106	next++;
	107	goto next_one;
	108	}
ecb49d1a	109	raw_spin_unlock_irqrestore(&base->cpu_base->lock, flags);
289f480a IM	110	}
	111
	112	static void
	113	print_base(struct seq_file m, struct hrtimer_clock_base base, u64 now)
	114	{
870e2a28	115	SEQ_printf(m, " .base: %p\n", base);
289f480a IM	116	SEQ_printf(m, " .index: %d\n",
289f480a IM	117	base->index);
9b04bd27	118	SEQ_printf(m, " .resolution: %Lu nsecs\n",
289f480a IM	119	(unsigned long long)ktime_to_ns(base->resolution));
	120	SEQ_printf(m, " .get_time: ");
	121	print_name_offset(m, base->get_time);
	122	SEQ_printf(m, "\n");
	123	#ifdef CONFIG_HIGH_RES_TIMERS
9b04bd27 DM	124	SEQ_printf(m, " .offset: %Lu nsecs\n",
9b04bd27 DM	125	(unsigned long long) ktime_to_ns(base->offset));
289f480a IM	126	#endif
	127	SEQ_printf(m, "active timers:\n");
	128	print_active_timers(m, base, now);
	129	}
	130
	131	static void print_cpu(struct seq_file *m, int cpu, u64 now)
	132	{
	133	struct hrtimer_cpu_base *cpu_base = &per_cpu(hrtimer_bases, cpu);
	134	int i;
	135
129f1d2c VN	136	SEQ_printf(m, "\n");
129f1d2c VN	137	SEQ_printf(m, "cpu: %d\n", cpu);
289f480a IM	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);
	141	}
	142	#define P(x) \
9b04bd27 DM	143	SEQ_printf(m, " .%-15s: %Lu\n", #x, \
9b04bd27 DM	144	(unsigned long long)(cpu_base->x))
289f480a	145	#define P_ns(x) \
9b04bd27 DM	146	SEQ_printf(m, " .%-15s: %Lu nsecs\n", #x, \
9b04bd27 DM	147	(unsigned long long)(ktime_to_ns(cpu_base->x)))
289f480a IM	148
	149	#ifdef CONFIG_HIGH_RES_TIMERS
	150	P_ns(expires_next);
	151	P(hres_active);
	152	P(nr_events);
41d2e494 TG	153	P(nr_retries);
	154	P(nr_hangs);
	155	P_ns(max_hang_time);
289f480a IM	156	#endif
	157	#undef P
	158	#undef P_ns
	159
	160	#ifdef CONFIG_TICK_ONESHOT
	161	# define P(x) \
9b04bd27 DM	162	SEQ_printf(m, " .%-15s: %Lu\n", #x, \
9b04bd27 DM	163	(unsigned long long)(ts->x))
289f480a	164	# define P_ns(x) \
9b04bd27 DM	165	SEQ_printf(m, " .%-15s: %Lu nsecs\n", #x, \
9b04bd27 DM	166	(unsigned long long)(ktime_to_ns(ts->x)))
289f480a IM	167	{
	168	struct tick_sched *ts = tick_get_tick_sched(cpu);
	169	P(nohz_mode);
	170	P_ns(idle_tick);
	171	P(tick_stopped);
	172	P(idle_jiffies);
	173	P(idle_calls);
	174	P(idle_sleeps);
	175	P_ns(idle_entrytime);
5df7fa1c TG	176	P_ns(idle_waketime);
5df7fa1c TG	177	P_ns(idle_exittime);
289f480a	178	P_ns(idle_sleeptime);
0224cf4c	179	P_ns(iowait_sleeptime);
289f480a IM	180	P(last_jiffies);
	181	P(next_jiffies);
	182	P_ns(idle_expires);
9b04bd27 DM	183	SEQ_printf(m, "jiffies: %Lu\n",
9b04bd27 DM	184	(unsigned long long)jiffies);
289f480a IM	185	}
	186	#endif
	187
	188	#undef P
	189	#undef P_ns
	190	}
	191
	192	#ifdef CONFIG_GENERIC_CLOCKEVENTS
	193	static void
c5b77a3d	194	print_tickdevice(struct seq_file m, struct tick_device td, int cpu)
289f480a IM	195	{
	196	struct clock_event_device *dev = td->evtdev;
	197
129f1d2c VN	198	SEQ_printf(m, "\n");
129f1d2c VN	199	SEQ_printf(m, "Tick Device: mode: %d\n", td->mode);
c5b77a3d TG	200	if (cpu < 0)
	201	SEQ_printf(m, "Broadcast device\n");
	202	else
	203	SEQ_printf(m, "Per CPU device: %d\n", cpu);
289f480a IM	204
	205	SEQ_printf(m, "Clock Event Device: ");
	206	if (!dev) {
	207	SEQ_printf(m, "<NULL>\n");
	208	return;
	209	}
	210	SEQ_printf(m, "%s\n", dev->name);
97813f2f JH	211	SEQ_printf(m, " max_delta_ns: %llu\n",
	212	(unsigned long long) dev->max_delta_ns);
	213	SEQ_printf(m, " min_delta_ns: %llu\n",
	214	(unsigned long long) dev->min_delta_ns);
23af368e TG	215	SEQ_printf(m, " mult: %u\n", dev->mult);
23af368e TG	216	SEQ_printf(m, " shift: %u\n", dev->shift);
289f480a IM	217	SEQ_printf(m, " mode: %d\n", dev->mode);
	218	SEQ_printf(m, " next_event: %Ld nsecs\n",
	219	(unsigned long long) ktime_to_ns(dev->next_event));
	220
	221	SEQ_printf(m, " set_next_event: ");
	222	print_name_offset(m, dev->set_next_event);
	223	SEQ_printf(m, "\n");
	224
	225	SEQ_printf(m, " set_mode: ");
	226	print_name_offset(m, dev->set_mode);
	227	SEQ_printf(m, "\n");
	228
	229	SEQ_printf(m, " event_handler: ");
	230	print_name_offset(m, dev->event_handler);
	231	SEQ_printf(m, "\n");
80a05b9f	232	SEQ_printf(m, " retries: %lu\n", dev->retries);
289f480a IM	233	}
	234
	235	static void timer_list_show_tickdevices(struct seq_file *m)
	236	{
	237	int cpu;
	238
	239	#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
c5b77a3d	240	print_tickdevice(m, tick_get_broadcast_device(), -1);
289f480a	241	SEQ_printf(m, "tick_broadcast_mask: %08lx\n",
62ac1279	242	cpumask_bits(tick_get_broadcast_mask())[0]);
289f480a IM	243	#ifdef CONFIG_TICK_ONESHOT
289f480a IM	244	SEQ_printf(m, "tick_broadcast_oneshot_mask: %08lx\n",
62ac1279	245	cpumask_bits(tick_get_broadcast_oneshot_mask())[0]);
289f480a IM	246	#endif
	247	SEQ_printf(m, "\n");
	248	#endif
	249	for_each_online_cpu(cpu)
c5b77a3d	250	print_tickdevice(m, tick_get_device(cpu), cpu);
289f480a IM	251	SEQ_printf(m, "\n");
	252	}
	253	#else
	254	static void timer_list_show_tickdevices(struct seq_file *m) { }
	255	#endif
	256
	257	static int timer_list_show(struct seq_file m, void v)
	258	{
	259	u64 now = ktime_to_ns(ktime_get());
	260	int cpu;
	261
80a05b9f	262	SEQ_printf(m, "Timer List Version: v0.6\n");
289f480a IM	263	SEQ_printf(m, "HRTIMER_MAX_CLOCK_BASES: %d\n", HRTIMER_MAX_CLOCK_BASES);
	264	SEQ_printf(m, "now at %Ld nsecs\n", (unsigned long long)now);
	265
	266	for_each_online_cpu(cpu)
	267	print_cpu(m, cpu, now);
	268
	269	SEQ_printf(m, "\n");
	270	timer_list_show_tickdevices(m);
	271
	272	return 0;
	273	}
	274
	275	void sysrq_timer_list_show(void)
	276	{
	277	timer_list_show(NULL, NULL);
	278	}
	279
	280	static int timer_list_open(struct inode inode, struct file filp)
	281	{
	282	return single_open(filp, timer_list_show, NULL);
	283	}
	284
828c0950	285	static const struct file_operations timer_list_fops = {
289f480a IM	286	.open = timer_list_open,
	287	.read = seq_read,
	288	.llseek = seq_lseek,
5ea473a1	289	.release = single_release,
289f480a IM	290	};
	291
	292	static int __init init_timer_list_procfs(void)
	293	{
	294	struct proc_dir_entry *pe;
	295
de809347	296	pe = proc_create("timer_list", 0444, NULL, &timer_list_fops);
289f480a IM	297	if (!pe)
289f480a IM	298	return -ENOMEM;
289f480a IM	299	return 0;
	300	}
	301	__initcall(init_timer_list_procfs);