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authorIngo Molnar <mingo@elte.hu>2007-02-16 04:28:15 -0500
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-02-16 11:13:59 -0500
commit289f480af87e45f7a6de6ba9b4c061c2e259fe98 (patch)
tree1075cdb8656d7af12558ea2a3dee1fcd1d7a44a7 /kernel
parent82f67cd9fca8c8762c15ba7ed0d5747588c1e221 (diff)
[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>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/time/Makefile2
-rw-r--r--kernel/time/tick-broadcast.c21
-rw-r--r--kernel/time/tick-common.c8
-rw-r--r--kernel/time/tick-sched.c5
-rw-r--r--kernel/time/timer_list.c287
5 files changed, 322 insertions, 1 deletions
diff --git a/kernel/time/Makefile b/kernel/time/Makefile
index 252b4b5d9dd0..93bccba1f265 100644
--- a/kernel/time/Makefile
+++ b/kernel/time/Makefile
@@ -1,4 +1,4 @@
1obj-y += ntp.o clocksource.o jiffies.o 1obj-y += ntp.o clocksource.o jiffies.o timer_list.o
2 2
3obj-$(CONFIG_GENERIC_CLOCKEVENTS) += clockevents.o 3obj-$(CONFIG_GENERIC_CLOCKEVENTS) += clockevents.o
4obj-$(CONFIG_GENERIC_CLOCKEVENTS) += tick-common.o 4obj-$(CONFIG_GENERIC_CLOCKEVENTS) += tick-common.o
diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c
index 8314ecb32d33..12b3efeb9f6f 100644
--- a/kernel/time/tick-broadcast.c
+++ b/kernel/time/tick-broadcast.c
@@ -32,6 +32,19 @@ static cpumask_t tick_broadcast_mask;
32static DEFINE_SPINLOCK(tick_broadcast_lock); 32static DEFINE_SPINLOCK(tick_broadcast_lock);
33 33
34/* 34/*
35 * Debugging: see timer_list.c
36 */
37struct tick_device *tick_get_broadcast_device(void)
38{
39 return &tick_broadcast_device;
40}
41
42cpumask_t *tick_get_broadcast_mask(void)
43{
44 return &tick_broadcast_mask;
45}
46
47/*
35 * Start the device in periodic mode 48 * Start the device in periodic mode
36 */ 49 */
37static void tick_broadcast_start_periodic(struct clock_event_device *bc) 50static void tick_broadcast_start_periodic(struct clock_event_device *bc)
@@ -275,6 +288,14 @@ void tick_shutdown_broadcast(unsigned int *cpup)
275 288
276static cpumask_t tick_broadcast_oneshot_mask; 289static cpumask_t tick_broadcast_oneshot_mask;
277 290
291/*
292 * Debugging: see timer_list.c
293 */
294cpumask_t *tick_get_broadcast_oneshot_mask(void)
295{
296 return &tick_broadcast_oneshot_mask;
297}
298
278static int tick_broadcast_set_event(ktime_t expires, int force) 299static int tick_broadcast_set_event(ktime_t expires, int force)
279{ 300{
280 struct clock_event_device *bc = tick_broadcast_device.evtdev; 301 struct clock_event_device *bc = tick_broadcast_device.evtdev;
diff --git a/kernel/time/tick-common.c b/kernel/time/tick-common.c
index c35d449be031..4500e347f1bb 100644
--- a/kernel/time/tick-common.c
+++ b/kernel/time/tick-common.c
@@ -34,6 +34,14 @@ ktime_t tick_period;
34static int tick_do_timer_cpu = -1; 34static int tick_do_timer_cpu = -1;
35DEFINE_SPINLOCK(tick_device_lock); 35DEFINE_SPINLOCK(tick_device_lock);
36 36
37/*
38 * Debugging: see timer_list.c
39 */
40struct tick_device *tick_get_device(int cpu)
41{
42 return &per_cpu(tick_cpu_device, cpu);
43}
44
37/** 45/**
38 * tick_is_oneshot_available - check for a oneshot capable event device 46 * tick_is_oneshot_available - check for a oneshot capable event device
39 */ 47 */
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 99d35e2af182..95e41f7f850b 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -33,6 +33,11 @@ static DEFINE_PER_CPU(struct tick_sched, tick_cpu_sched);
33 */ 33 */
34static ktime_t last_jiffies_update; 34static ktime_t last_jiffies_update;
35 35
36struct tick_sched *tick_get_tick_sched(int cpu)
37{
38 return &per_cpu(tick_cpu_sched, cpu);
39}
40
36/* 41/*
37 * Must be called with interrupts disabled ! 42 * Must be called with interrupts disabled !
38 */ 43 */
diff --git a/kernel/time/timer_list.c b/kernel/time/timer_list.c
new file mode 100644
index 000000000000..f82c635c3d5c
--- /dev/null
+++ b/kernel/time/timer_list.c
@@ -0,0 +1,287 @@
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
23typedef void (*print_fn_t)(struct seq_file *m, unsigned int *classes);
24
25DECLARE_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
39static void print_name_offset(struct seq_file *m, void *sym)
40{
41 unsigned long addr = (unsigned long)sym;
42 char namebuf[KSYM_NAME_LEN+1];
43 unsigned long size, offset;
44 const char *sym_name;
45 char *modname;
46
47 sym_name = kallsyms_lookup(addr, &size, &offset, &modname, namebuf);
48 if (sym_name)
49 SEQ_printf(m, "%s", sym_name);
50 else
51 SEQ_printf(m, "<%p>", sym);
52}
53
54static void
55print_timer(struct seq_file *m, struct hrtimer *timer, int idx, u64 now)
56{
57#ifdef CONFIG_TIMER_STATS
58 char tmp[TASK_COMM_LEN + 1];
59#endif
60 SEQ_printf(m, " #%d: ", idx);
61 print_name_offset(m, timer);
62 SEQ_printf(m, ", ");
63 print_name_offset(m, timer->function);
64 SEQ_printf(m, ", S:%02lx", timer->state);
65#ifdef CONFIG_TIMER_STATS
66 SEQ_printf(m, ", ");
67 print_name_offset(m, timer->start_site);
68 memcpy(tmp, timer->start_comm, TASK_COMM_LEN);
69 tmp[TASK_COMM_LEN] = 0;
70 SEQ_printf(m, ", %s/%d", tmp, timer->start_pid);
71#endif
72 SEQ_printf(m, "\n");
73 SEQ_printf(m, " # expires at %Ld nsecs [in %Ld nsecs]\n",
74 (unsigned long long)ktime_to_ns(timer->expires),
75 (unsigned long long)(ktime_to_ns(timer->expires) - now));
76}
77
78static void
79print_active_timers(struct seq_file *m, struct hrtimer_clock_base *base,
80 u64 now)
81{
82 struct hrtimer *timer, tmp;
83 unsigned long next = 0, i;
84 struct rb_node *curr;
85 unsigned long flags;
86
87next_one:
88 i = 0;
89 spin_lock_irqsave(&base->cpu_base->lock, flags);
90
91 curr = base->first;
92 /*
93 * Crude but we have to do this O(N*N) thing, because
94 * we have to unlock the base when printing:
95 */
96 while (curr && i < next) {
97 curr = rb_next(curr);
98 i++;
99 }
100
101 if (curr) {
102
103 timer = rb_entry(curr, struct hrtimer, node);
104 tmp = *timer;
105 spin_unlock_irqrestore(&base->cpu_base->lock, flags);
106
107 print_timer(m, &tmp, i, now);
108 next++;
109 goto next_one;
110 }
111 spin_unlock_irqrestore(&base->cpu_base->lock, flags);
112}
113
114static void
115print_base(struct seq_file *m, struct hrtimer_clock_base *base, u64 now)
116{
117 SEQ_printf(m, " .index: %d\n",
118 base->index);
119 SEQ_printf(m, " .resolution: %Ld nsecs\n",
120 (unsigned long long)ktime_to_ns(base->resolution));
121 SEQ_printf(m, " .get_time: ");
122 print_name_offset(m, base->get_time);
123 SEQ_printf(m, "\n");
124#ifdef CONFIG_HIGH_RES_TIMERS
125 SEQ_printf(m, " .offset: %Ld nsecs\n",
126 ktime_to_ns(base->offset));
127#endif
128 SEQ_printf(m, "active timers:\n");
129 print_active_timers(m, base, now);
130}
131
132static void print_cpu(struct seq_file *m, int cpu, u64 now)
133{
134 struct hrtimer_cpu_base *cpu_base = &per_cpu(hrtimer_bases, cpu);
135 int i;
136
137 SEQ_printf(m, "\ncpu: %d\n", cpu);
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) \
143 SEQ_printf(m, " .%-15s: %Ld\n", #x, (u64)(cpu_base->x))
144#define P_ns(x) \
145 SEQ_printf(m, " .%-15s: %Ld nsecs\n", #x, \
146 (u64)(ktime_to_ns(cpu_base->x)))
147
148#ifdef CONFIG_HIGH_RES_TIMERS
149 P_ns(expires_next);
150 P(hres_active);
151 P(nr_events);
152#endif
153#undef P
154#undef P_ns
155
156#ifdef CONFIG_TICK_ONESHOT
157# define P(x) \
158 SEQ_printf(m, " .%-15s: %Ld\n", #x, (u64)(ts->x))
159# define P_ns(x) \
160 SEQ_printf(m, " .%-15s: %Ld nsecs\n", #x, \
161 (u64)(ktime_to_ns(ts->x)))
162 {
163 struct tick_sched *ts = tick_get_tick_sched(cpu);
164 P(nohz_mode);
165 P_ns(idle_tick);
166 P(tick_stopped);
167 P(idle_jiffies);
168 P(idle_calls);
169 P(idle_sleeps);
170 P_ns(idle_entrytime);
171 P_ns(idle_sleeptime);
172 P(last_jiffies);
173 P(next_jiffies);
174 P_ns(idle_expires);
175 SEQ_printf(m, "jiffies: %Ld\n", (u64)jiffies);
176 }
177#endif
178
179#undef P
180#undef P_ns
181}
182
183#ifdef CONFIG_GENERIC_CLOCKEVENTS
184static void
185print_tickdevice(struct seq_file *m, struct tick_device *td)
186{
187 struct clock_event_device *dev = td->evtdev;
188
189 SEQ_printf(m, "\nTick Device: mode: %d\n", td->mode);
190
191 SEQ_printf(m, "Clock Event Device: ");
192 if (!dev) {
193 SEQ_printf(m, "<NULL>\n");
194 return;
195 }
196 SEQ_printf(m, "%s\n", dev->name);
197 SEQ_printf(m, " max_delta_ns: %ld\n", dev->max_delta_ns);
198 SEQ_printf(m, " min_delta_ns: %ld\n", dev->min_delta_ns);
199 SEQ_printf(m, " mult: %ld\n", dev->mult);
200 SEQ_printf(m, " shift: %d\n", dev->shift);
201 SEQ_printf(m, " mode: %d\n", dev->mode);
202 SEQ_printf(m, " next_event: %Ld nsecs\n",
203 (unsigned long long) ktime_to_ns(dev->next_event));
204
205 SEQ_printf(m, " set_next_event: ");
206 print_name_offset(m, dev->set_next_event);
207 SEQ_printf(m, "\n");
208
209 SEQ_printf(m, " set_mode: ");
210 print_name_offset(m, dev->set_mode);
211 SEQ_printf(m, "\n");
212
213 SEQ_printf(m, " event_handler: ");
214 print_name_offset(m, dev->event_handler);
215 SEQ_printf(m, "\n");
216}
217
218static void timer_list_show_tickdevices(struct seq_file *m)
219{
220 int cpu;
221
222#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
223 print_tickdevice(m, tick_get_broadcast_device());
224 SEQ_printf(m, "tick_broadcast_mask: %08lx\n",
225 tick_get_broadcast_mask()->bits[0]);
226#ifdef CONFIG_TICK_ONESHOT
227 SEQ_printf(m, "tick_broadcast_oneshot_mask: %08lx\n",
228 tick_get_broadcast_oneshot_mask()->bits[0]);
229#endif
230 SEQ_printf(m, "\n");
231#endif
232 for_each_online_cpu(cpu)
233 print_tickdevice(m, tick_get_device(cpu));
234 SEQ_printf(m, "\n");
235}
236#else
237static void timer_list_show_tickdevices(struct seq_file *m) { }
238#endif
239
240static int timer_list_show(struct seq_file *m, void *v)
241{
242 u64 now = ktime_to_ns(ktime_get());
243 int cpu;
244
245 SEQ_printf(m, "Timer List Version: v0.3\n");
246 SEQ_printf(m, "HRTIMER_MAX_CLOCK_BASES: %d\n", HRTIMER_MAX_CLOCK_BASES);
247 SEQ_printf(m, "now at %Ld nsecs\n", (unsigned long long)now);
248
249 for_each_online_cpu(cpu)
250 print_cpu(m, cpu, now);
251
252 SEQ_printf(m, "\n");
253 timer_list_show_tickdevices(m);
254
255 return 0;
256}
257
258void sysrq_timer_list_show(void)
259{
260 timer_list_show(NULL, NULL);
261}
262
263static int timer_list_open(struct inode *inode, struct file *filp)
264{
265 return single_open(filp, timer_list_show, NULL);
266}
267
268static struct file_operations timer_list_fops = {
269 .open = timer_list_open,
270 .read = seq_read,
271 .llseek = seq_lseek,
272 .release = seq_release,
273};
274
275static int __init init_timer_list_procfs(void)
276{
277 struct proc_dir_entry *pe;
278
279 pe = create_proc_entry("timer_list", 0644, NULL);
280 if (!pe)
281 return -ENOMEM;
282
283 pe->proc_fops = &timer_list_fops;
284
285 return 0;
286}
287__initcall(init_timer_list_procfs);