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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 | { |
41 | char symname[KSYM_NAME_LEN]; |
42 | |
43 | if (lookup_symbol_name((unsigned long)sym, symname) < 0) |
44 | SEQ_printf(m, "<%p>", sym); |
45 | else |
46 | SEQ_printf(m, "%s", symname); |
47 | } |
48 | |
49 | static void |
50 | print_timer(struct seq_file *m, struct hrtimer *taddr, struct hrtimer *timer, |
51 | int idx, u64 now) |
52 | { |
53 | #ifdef CONFIG_TIMER_STATS |
54 | char tmp[TASK_COMM_LEN + 1]; |
55 | #endif |
56 | SEQ_printf(m, " #%d: ", idx); |
57 | print_name_offset(m, taddr); |
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"); |
69 | SEQ_printf(m, " # expires at %Lu-%Lu nsecs [in %Ld to %Ld nsecs]\n", |
70 | (unsigned long long)ktime_to_ns(hrtimer_get_softexpires(timer)), |
71 | (unsigned long long)ktime_to_ns(hrtimer_get_expires(timer)), |
72 | (long long)(ktime_to_ns(hrtimer_get_softexpires(timer)) - now), |
73 | (long long)(ktime_to_ns(hrtimer_get_expires(timer)) - now)); |
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; |
87 | raw_spin_lock_irqsave(&base->cpu_base->lock, flags); |
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; |
103 | raw_spin_unlock_irqrestore(&base->cpu_base->lock, flags); |
104 | |
105 | print_timer(m, timer, &tmp, i, now); |
106 | next++; |
107 | goto next_one; |
108 | } |
109 | raw_spin_unlock_irqrestore(&base->cpu_base->lock, flags); |
110 | } |
111 | |
112 | static void |
113 | print_base(struct seq_file *m, struct hrtimer_clock_base *base, u64 now) |
114 | { |
115 | SEQ_printf(m, " .base: %p\n", base); |
116 | SEQ_printf(m, " .index: %d\n", |
117 | base->index); |
118 | SEQ_printf(m, " .resolution: %Lu nsecs\n", |
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 |
124 | SEQ_printf(m, " .offset: %Lu nsecs\n", |
125 | (unsigned long long) ktime_to_ns(base->offset)); |
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 | |
136 | SEQ_printf(m, "\n"); |
137 | SEQ_printf(m, "cpu: %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: %Lu\n", #x, \ |
144 | (unsigned long long)(cpu_base->x)) |
145 | #define P_ns(x) \ |
146 | SEQ_printf(m, " .%-15s: %Lu nsecs\n", #x, \ |
147 | (unsigned long long)(ktime_to_ns(cpu_base->x))) |
148 | |
149 | #ifdef CONFIG_HIGH_RES_TIMERS |
150 | P_ns(expires_next); |
151 | P(hres_active); |
152 | P(nr_events); |
153 | P(nr_retries); |
154 | P(nr_hangs); |
155 | P_ns(max_hang_time); |
156 | #endif |
157 | #undef P |
158 | #undef P_ns |
159 | |
160 | #ifdef CONFIG_TICK_ONESHOT |
161 | # define P(x) \ |
162 | SEQ_printf(m, " .%-15s: %Lu\n", #x, \ |
163 | (unsigned long long)(ts->x)) |
164 | # define P_ns(x) \ |
165 | SEQ_printf(m, " .%-15s: %Lu nsecs\n", #x, \ |
166 | (unsigned long long)(ktime_to_ns(ts->x))) |
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); |
176 | P_ns(idle_waketime); |
177 | P_ns(idle_exittime); |
178 | P_ns(idle_sleeptime); |
179 | P_ns(iowait_sleeptime); |
180 | P(last_jiffies); |
181 | P(next_jiffies); |
182 | P_ns(idle_expires); |
183 | SEQ_printf(m, "jiffies: %Lu\n", |
184 | (unsigned long long)jiffies); |
185 | } |
186 | #endif |
187 | |
188 | #undef P |
189 | #undef P_ns |
190 | } |
191 | |
192 | #ifdef CONFIG_GENERIC_CLOCKEVENTS |
193 | static void |
194 | print_tickdevice(struct seq_file *m, struct tick_device *td, int cpu) |
195 | { |
196 | struct clock_event_device *dev = td->evtdev; |
197 | |
198 | SEQ_printf(m, "\n"); |
199 | SEQ_printf(m, "Tick Device: mode: %d\n", td->mode); |
200 | if (cpu < 0) |
201 | SEQ_printf(m, "Broadcast device\n"); |
202 | else |
203 | SEQ_printf(m, "Per CPU device: %d\n", cpu); |
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); |
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); |
215 | SEQ_printf(m, " mult: %u\n", dev->mult); |
216 | SEQ_printf(m, " shift: %u\n", dev->shift); |
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"); |
232 | SEQ_printf(m, " retries: %lu\n", dev->retries); |
233 | } |
234 | |
235 | static void timer_list_show_tickdevices(struct seq_file *m) |
236 | { |
237 | int cpu; |
238 | |
239 | #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST |
240 | print_tickdevice(m, tick_get_broadcast_device(), -1); |
241 | SEQ_printf(m, "tick_broadcast_mask: %08lx\n", |
242 | cpumask_bits(tick_get_broadcast_mask())[0]); |
243 | #ifdef CONFIG_TICK_ONESHOT |
244 | SEQ_printf(m, "tick_broadcast_oneshot_mask: %08lx\n", |
245 | cpumask_bits(tick_get_broadcast_oneshot_mask())[0]); |
246 | #endif |
247 | SEQ_printf(m, "\n"); |
248 | #endif |
249 | for_each_online_cpu(cpu) |
250 | print_tickdevice(m, tick_get_device(cpu), cpu); |
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 | |
262 | SEQ_printf(m, "Timer List Version: v0.6\n"); |
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 | |
285 | static const struct file_operations timer_list_fops = { |
286 | .open = timer_list_open, |
287 | .read = seq_read, |
288 | .llseek = seq_lseek, |
289 | .release = single_release, |
290 | }; |
291 | |
292 | static int __init init_timer_list_procfs(void) |
293 | { |
294 | struct proc_dir_entry *pe; |
295 | |
296 | pe = proc_create("timer_list", 0444, NULL, &timer_list_fops); |
297 | if (!pe) |
298 | return -ENOMEM; |
299 | return 0; |
300 | } |
301 | __initcall(init_timer_list_procfs); |
302 |
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