[PATCH] Add debugging feature /proc/timer_list
add /proc/timer_list, which prints all currently pending (high-res) timers, all clock-event sources and their parameters in a human-readable form. Sample output: Timer List Version: v0.1 HRTIMER_MAX_CLOCK_BASES: 2 now at 4246046273872 nsecs cpu: 0 clock 0: .index: 0 .resolution: 1 nsecs .get_time: ktime_get_real .offset: 1273998312645738432 nsecs active timers: clock 1: .index: 1 .resolution: 1 nsecs .get_time: ktime_get .offset: 0 nsecs active timers: #0: <f5a90ec8>, hrtimer_sched_tick, hrtimer_stop_sched_tick, swapper/0 # expires at 4246432689566 nsecs [in 386415694 nsecs] #1: <f5a90ec8>, hrtimer_wakeup, do_nanosleep, pcscd/2050 # expires at 4247018194689 nsecs [in 971920817 nsecs] #2: <f5a90ec8>, hrtimer_wakeup, do_nanosleep, irqbalance/1909 # expires at 4247351358392 nsecs [in 1305084520 nsecs] #3: <f5a90ec8>, hrtimer_wakeup, do_nanosleep, crond/2157 # expires at 4249097614968 nsecs [in 3051341096 nsecs] #4: <f5a90ec8>, it_real_fn, do_setitimer, syslogd/1888 # expires at 4251329900926 nsecs [in 5283627054 nsecs] .expires_next : 4246432689566 nsecs .hres_active : 1 .check_clocks : 0 .nr_events : 31306 .idle_tick : 4246020791890 nsecs .tick_stopped : 1 .idle_jiffies : 986504 .idle_calls : 40700 .idle_sleeps : 36014 .idle_entrytime : 4246019418883 nsecs .idle_sleeptime : 4178181972709 nsecs cpu: 1 clock 0: .index: 0 .resolution: 1 nsecs .get_time: ktime_get_real .offset: 1273998312645738432 nsecs active timers: clock 1: .index: 1 .resolution: 1 nsecs .get_time: ktime_get .offset: 0 nsecs active timers: #0: <f5a90ec8>, hrtimer_sched_tick, hrtimer_restart_sched_tick, swapper/0 # expires at 4246050084568 nsecs [in 3810696 nsecs] #1: <f5a90ec8>, hrtimer_wakeup, do_nanosleep, atd/2227 # expires at 4261010635003 nsecs [in 14964361131 nsecs] #2: <f5a90ec8>, hrtimer_wakeup, do_nanosleep, smartd/2332 # expires at 5469485798970 nsecs [in 1223439525098 nsecs] .expires_next : 4246050084568 nsecs .hres_active : 1 .check_clocks : 0 .nr_events : 24043 .idle_tick : 4246046084568 nsecs .tick_stopped : 0 .idle_jiffies : 986510 .idle_calls : 26360 .idle_sleeps : 22551 .idle_entrytime : 4246043874339 nsecs .idle_sleeptime : 4170763761184 nsecs tick_broadcast_mask: 00000003 event_broadcast_mask: 00000001 CPU#0's local event device: Clock Event Device: lapic capabilities: 0000000e max_delta_ns: 807385544 min_delta_ns: 1443 mult: 44624025 shift: 32 set_next_event: lapic_next_event set_mode: lapic_timer_setup event_handler: hrtimer_interrupt .installed: 1 .expires: 4246432689566 nsecs CPU#1's local event device: Clock Event Device: lapic capabilities: 0000000e max_delta_ns: 807385544 min_delta_ns: 1443 mult: 44624025 shift: 32 set_next_event: lapic_next_event set_mode: lapic_timer_setup event_handler: hrtimer_interrupt .installed: 1 .expires: 4246050084568 nsecs Clock Event Device: hpet capabilities: 00000007 max_delta_ns: 2147483647 min_delta_ns: 3352 mult: 61496110 shift: 32 set_next_event: hpet_next_event set_mode: hpet_set_mode event_handler: handle_nextevt_broadcast Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: john stultz <johnstul@us.ibm.com> Cc: Roman Zippel <zippel@linux-m68k.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>hifive-unleashed-5.1
Ingo Molnar
Linus Torvalds
parent
82f67cd9fc
commit
289f480af8
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@ -59,6 +59,7 @@ struct tick_sched {
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extern void __init tick_init(void);
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extern int tick_is_oneshot_available(void);
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extern struct tick_device *tick_get_device(int cpu);
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# ifdef CONFIG_HIGH_RES_TIMERS
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extern int tick_init_highres(void);
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@ -69,6 +70,16 @@ extern void tick_cancel_sched_timer(int cpu);
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static inline void tick_cancel_sched_timer(int cpu) { }
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# endif /* HIGHRES */
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# ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
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extern struct tick_device *tick_get_broadcast_device(void);
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extern cpumask_t *tick_get_broadcast_mask(void);
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# ifdef CONFIG_TICK_ONESHOT
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extern cpumask_t *tick_get_broadcast_oneshot_mask(void);
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# endif
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# endif /* BROADCAST */
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# ifdef CONFIG_TICK_ONESHOT
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extern void tick_clock_notify(void);
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extern int tick_check_oneshot_change(int allow_nohz);
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@ -1,4 +1,4 @@
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obj-y += ntp.o clocksource.o jiffies.o
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obj-y += ntp.o clocksource.o jiffies.o timer_list.o
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obj-$(CONFIG_GENERIC_CLOCKEVENTS) += clockevents.o
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obj-$(CONFIG_GENERIC_CLOCKEVENTS) += tick-common.o
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@ -31,6 +31,19 @@ struct tick_device tick_broadcast_device;
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static cpumask_t tick_broadcast_mask;
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static DEFINE_SPINLOCK(tick_broadcast_lock);
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/*
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* Debugging: see timer_list.c
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*/
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struct tick_device *tick_get_broadcast_device(void)
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{
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return &tick_broadcast_device;
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}
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cpumask_t *tick_get_broadcast_mask(void)
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{
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return &tick_broadcast_mask;
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}
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/*
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* Start the device in periodic mode
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*/
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@ -275,6 +288,14 @@ void tick_shutdown_broadcast(unsigned int *cpup)
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static cpumask_t tick_broadcast_oneshot_mask;
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/*
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* Debugging: see timer_list.c
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*/
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cpumask_t *tick_get_broadcast_oneshot_mask(void)
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{
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return &tick_broadcast_oneshot_mask;
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}
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static int tick_broadcast_set_event(ktime_t expires, int force)
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{
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struct clock_event_device *bc = tick_broadcast_device.evtdev;
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@ -34,6 +34,14 @@ ktime_t tick_period;
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static int tick_do_timer_cpu = -1;
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DEFINE_SPINLOCK(tick_device_lock);
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/*
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* Debugging: see timer_list.c
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*/
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struct tick_device *tick_get_device(int cpu)
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{
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return &per_cpu(tick_cpu_device, cpu);
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}
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/**
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* tick_is_oneshot_available - check for a oneshot capable event device
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*/
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@ -33,6 +33,11 @@ static DEFINE_PER_CPU(struct tick_sched, tick_cpu_sched);
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*/
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static ktime_t last_jiffies_update;
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struct tick_sched *tick_get_tick_sched(int cpu)
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{
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return &per_cpu(tick_cpu_sched, cpu);
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}
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/*
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* Must be called with interrupts disabled !
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*/
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@ -0,0 +1,287 @@
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/*
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* kernel/time/timer_list.c
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*
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* List pending timers
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*
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* Copyright(C) 2006, Red Hat, Inc., Ingo Molnar
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/proc_fs.h>
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#include <linux/module.h>
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#include <linux/spinlock.h>
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#include <linux/sched.h>
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#include <linux/seq_file.h>
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#include <linux/kallsyms.h>
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#include <linux/tick.h>
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#include <asm/uaccess.h>
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typedef void (*print_fn_t)(struct seq_file *m, unsigned int *classes);
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DECLARE_PER_CPU(struct hrtimer_cpu_base, hrtimer_bases);
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/*
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* This allows printing both to /proc/timer_list and
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* to the console (on SysRq-Q):
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*/
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#define SEQ_printf(m, x...) \
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do { \
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if (m) \
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seq_printf(m, x); \
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else \
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printk(x); \
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} while (0)
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static void print_name_offset(struct seq_file *m, void *sym)
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{
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unsigned long addr = (unsigned long)sym;
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char namebuf[KSYM_NAME_LEN+1];
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unsigned long size, offset;
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const char *sym_name;
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char *modname;
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sym_name = kallsyms_lookup(addr, &size, &offset, &modname, namebuf);
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if (sym_name)
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SEQ_printf(m, "%s", sym_name);
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else
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SEQ_printf(m, "<%p>", sym);
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}
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static void
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print_timer(struct seq_file *m, struct hrtimer *timer, int idx, u64 now)
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{
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#ifdef CONFIG_TIMER_STATS
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char tmp[TASK_COMM_LEN + 1];
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#endif
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SEQ_printf(m, " #%d: ", idx);
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print_name_offset(m, timer);
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SEQ_printf(m, ", ");
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print_name_offset(m, timer->function);
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SEQ_printf(m, ", S:%02lx", timer->state);
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#ifdef CONFIG_TIMER_STATS
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SEQ_printf(m, ", ");
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print_name_offset(m, timer->start_site);
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memcpy(tmp, timer->start_comm, TASK_COMM_LEN);
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tmp[TASK_COMM_LEN] = 0;
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SEQ_printf(m, ", %s/%d", tmp, timer->start_pid);
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#endif
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SEQ_printf(m, "\n");
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SEQ_printf(m, " # expires at %Ld nsecs [in %Ld nsecs]\n",
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(unsigned long long)ktime_to_ns(timer->expires),
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(unsigned long long)(ktime_to_ns(timer->expires) - now));
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}
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static void
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print_active_timers(struct seq_file *m, struct hrtimer_clock_base *base,
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u64 now)
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{
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struct hrtimer *timer, tmp;
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unsigned long next = 0, i;
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struct rb_node *curr;
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unsigned long flags;
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next_one:
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i = 0;
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spin_lock_irqsave(&base->cpu_base->lock, flags);
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curr = base->first;
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/*
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* Crude but we have to do this O(N*N) thing, because
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* we have to unlock the base when printing:
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*/
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while (curr && i < next) {
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curr = rb_next(curr);
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i++;
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}
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if (curr) {
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timer = rb_entry(curr, struct hrtimer, node);
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tmp = *timer;
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spin_unlock_irqrestore(&base->cpu_base->lock, flags);
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print_timer(m, &tmp, i, now);
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next++;
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goto next_one;
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}
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spin_unlock_irqrestore(&base->cpu_base->lock, flags);
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}
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static void
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print_base(struct seq_file *m, struct hrtimer_clock_base *base, u64 now)
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{
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SEQ_printf(m, " .index: %d\n",
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base->index);
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SEQ_printf(m, " .resolution: %Ld nsecs\n",
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(unsigned long long)ktime_to_ns(base->resolution));
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SEQ_printf(m, " .get_time: ");
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print_name_offset(m, base->get_time);
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SEQ_printf(m, "\n");
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#ifdef CONFIG_HIGH_RES_TIMERS
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SEQ_printf(m, " .offset: %Ld nsecs\n",
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ktime_to_ns(base->offset));
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#endif
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SEQ_printf(m, "active timers:\n");
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print_active_timers(m, base, now);
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}
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static void print_cpu(struct seq_file *m, int cpu, u64 now)
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{
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struct hrtimer_cpu_base *cpu_base = &per_cpu(hrtimer_bases, cpu);
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int i;
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SEQ_printf(m, "\ncpu: %d\n", cpu);
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for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) {
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SEQ_printf(m, " clock %d:\n", i);
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print_base(m, cpu_base->clock_base + i, now);
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}
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#define P(x) \
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SEQ_printf(m, " .%-15s: %Ld\n", #x, (u64)(cpu_base->x))
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#define P_ns(x) \
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SEQ_printf(m, " .%-15s: %Ld nsecs\n", #x, \
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(u64)(ktime_to_ns(cpu_base->x)))
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#ifdef CONFIG_HIGH_RES_TIMERS
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P_ns(expires_next);
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P(hres_active);
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P(nr_events);
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#endif
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#undef P
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#undef P_ns
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#ifdef CONFIG_TICK_ONESHOT
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# define P(x) \
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SEQ_printf(m, " .%-15s: %Ld\n", #x, (u64)(ts->x))
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# define P_ns(x) \
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SEQ_printf(m, " .%-15s: %Ld nsecs\n", #x, \
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(u64)(ktime_to_ns(ts->x)))
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{
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struct tick_sched *ts = tick_get_tick_sched(cpu);
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P(nohz_mode);
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P_ns(idle_tick);
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P(tick_stopped);
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P(idle_jiffies);
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P(idle_calls);
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P(idle_sleeps);
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P_ns(idle_entrytime);
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P_ns(idle_sleeptime);
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P(last_jiffies);
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P(next_jiffies);
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P_ns(idle_expires);
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SEQ_printf(m, "jiffies: %Ld\n", (u64)jiffies);
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}
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#endif
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#undef P
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#undef P_ns
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}
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#ifdef CONFIG_GENERIC_CLOCKEVENTS
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static void
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print_tickdevice(struct seq_file *m, struct tick_device *td)
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{
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struct clock_event_device *dev = td->evtdev;
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SEQ_printf(m, "\nTick Device: mode: %d\n", td->mode);
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SEQ_printf(m, "Clock Event Device: ");
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if (!dev) {
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SEQ_printf(m, "<NULL>\n");
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return;
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}
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SEQ_printf(m, "%s\n", dev->name);
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SEQ_printf(m, " max_delta_ns: %ld\n", dev->max_delta_ns);
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SEQ_printf(m, " min_delta_ns: %ld\n", dev->min_delta_ns);
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SEQ_printf(m, " mult: %ld\n", dev->mult);
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SEQ_printf(m, " shift: %d\n", dev->shift);
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SEQ_printf(m, " mode: %d\n", dev->mode);
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SEQ_printf(m, " next_event: %Ld nsecs\n",
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(unsigned long long) ktime_to_ns(dev->next_event));
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SEQ_printf(m, " set_next_event: ");
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print_name_offset(m, dev->set_next_event);
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SEQ_printf(m, "\n");
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SEQ_printf(m, " set_mode: ");
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print_name_offset(m, dev->set_mode);
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SEQ_printf(m, "\n");
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SEQ_printf(m, " event_handler: ");
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print_name_offset(m, dev->event_handler);
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SEQ_printf(m, "\n");
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}
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static void timer_list_show_tickdevices(struct seq_file *m)
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{
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int cpu;
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#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
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print_tickdevice(m, tick_get_broadcast_device());
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SEQ_printf(m, "tick_broadcast_mask: %08lx\n",
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tick_get_broadcast_mask()->bits[0]);
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#ifdef CONFIG_TICK_ONESHOT
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SEQ_printf(m, "tick_broadcast_oneshot_mask: %08lx\n",
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tick_get_broadcast_oneshot_mask()->bits[0]);
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#endif
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SEQ_printf(m, "\n");
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#endif
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for_each_online_cpu(cpu)
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print_tickdevice(m, tick_get_device(cpu));
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SEQ_printf(m, "\n");
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}
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#else
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static void timer_list_show_tickdevices(struct seq_file *m) { }
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#endif
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static int timer_list_show(struct seq_file *m, void *v)
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{
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u64 now = ktime_to_ns(ktime_get());
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int cpu;
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SEQ_printf(m, "Timer List Version: v0.3\n");
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SEQ_printf(m, "HRTIMER_MAX_CLOCK_BASES: %d\n", HRTIMER_MAX_CLOCK_BASES);
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SEQ_printf(m, "now at %Ld nsecs\n", (unsigned long long)now);
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for_each_online_cpu(cpu)
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print_cpu(m, cpu, now);
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SEQ_printf(m, "\n");
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timer_list_show_tickdevices(m);
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return 0;
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}
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void sysrq_timer_list_show(void)
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{
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timer_list_show(NULL, NULL);
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}
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static int timer_list_open(struct inode *inode, struct file *filp)
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{
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return single_open(filp, timer_list_show, NULL);
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}
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static struct file_operations timer_list_fops = {
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.open = timer_list_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release,
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};
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static int __init init_timer_list_procfs(void)
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{
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struct proc_dir_entry *pe;
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pe = create_proc_entry("timer_list", 0644, NULL);
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if (!pe)
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return -ENOMEM;
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pe->proc_fops = &timer_list_fops;
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return 0;
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}
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__initcall(init_timer_list_procfs);
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