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 nsecs [in %Ld nsecs]\n", 70 (unsigned long long)ktime_to_ns(timer->expires), 71 (long long)(ktime_to_ns(timer->expires) - now)); 72 } 73 74 static void 75 print_active_timers(struct seq_file *m, struct hrtimer_clock_base *base, 76 u64 now) 77 { 78 struct hrtimer *timer, tmp; 79 unsigned long next = 0, i; 80 struct rb_node *curr; 81 unsigned long flags; 82 83 next_one: 84 i = 0; 85 spin_lock_irqsave(&base->cpu_base->lock, flags); 86 87 curr = base->first; 88 /* 89 * Crude but we have to do this O(N*N) thing, because 90 * we have to unlock the base when printing: 91 */ 92 while (curr && i < next) { 93 curr = rb_next(curr); 94 i++; 95 } 96 97 if (curr) { 98 99 timer = rb_entry(curr, struct hrtimer, node); 100 tmp = *timer; 101 spin_unlock_irqrestore(&base->cpu_base->lock, flags); 102 103 print_timer(m, timer, &tmp, i, now); 104 next++; 105 goto next_one; 106 } 107 spin_unlock_irqrestore(&base->cpu_base->lock, flags); 108 } 109 110 static void 111 print_base(struct seq_file *m, struct hrtimer_clock_base *base, u64 now) 112 { 113 SEQ_printf(m, " .base: %p\n", base); 114 SEQ_printf(m, " .index: %d\n", 115 base->index); 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); 120 SEQ_printf(m, "\n"); 121 #ifdef CONFIG_HIGH_RES_TIMERS 122 SEQ_printf(m, " .offset: %Lu nsecs\n", 123 (unsigned long long) ktime_to_ns(base->offset)); 124 #endif 125 SEQ_printf(m, "active timers:\n"); 126 print_active_timers(m, base, now); 127 } 128 129 static void print_cpu(struct seq_file *m, int cpu, u64 now) 130 { 131 struct hrtimer_cpu_base *cpu_base = &per_cpu(hrtimer_bases, cpu); 132 int i; 133 134 SEQ_printf(m, "\n"); 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); 139 } 140 #define P(x) \ 141 SEQ_printf(m, " .%-15s: %Lu\n", #x, \ 142 (unsigned long long)(cpu_base->x)) 143 #define P_ns(x) \ 144 SEQ_printf(m, " .%-15s: %Lu nsecs\n", #x, \ 145 (unsigned long long)(ktime_to_ns(cpu_base->x))) 146 147 #ifdef CONFIG_HIGH_RES_TIMERS 148 P_ns(expires_next); 149 P(hres_active); 150 P(nr_events); 151 #endif 152 #undef P 153 #undef P_ns 154 155 #ifdef CONFIG_TICK_ONESHOT 156 # define P(x) \ 157 SEQ_printf(m, " .%-15s: %Lu\n", #x, \ 158 (unsigned long long)(ts->x)) 159 # define P_ns(x) \ 160 SEQ_printf(m, " .%-15s: %Lu nsecs\n", #x, \ 161 (unsigned long long)(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_waketime); 172 P_ns(idle_exittime); 173 P_ns(idle_sleeptime); 174 P(last_jiffies); 175 P(next_jiffies); 176 P_ns(idle_expires); 177 SEQ_printf(m, "jiffies: %Lu\n", 178 (unsigned long long)jiffies); 179 } 180 #endif 181 182 #undef P 183 #undef P_ns 184 } 185 186 #ifdef CONFIG_GENERIC_CLOCKEVENTS 187 static void 188 print_tickdevice(struct seq_file *m, struct tick_device *td, int cpu) 189 { 190 struct clock_event_device *dev = td->evtdev; 191 192 SEQ_printf(m, "\n"); 193 SEQ_printf(m, "Tick Device: mode: %d\n", td->mode); 194 if (cpu < 0) 195 SEQ_printf(m, "Broadcast device\n"); 196 else 197 SEQ_printf(m, "Per CPU device: %d\n", cpu); 198 199 SEQ_printf(m, "Clock Event Device: "); 200 if (!dev) { 201 SEQ_printf(m, "<NULL>\n"); 202 return; 203 } 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)); 212 213 SEQ_printf(m, " set_next_event: "); 214 print_name_offset(m, dev->set_next_event); 215 SEQ_printf(m, "\n"); 216 217 SEQ_printf(m, " set_mode: "); 218 print_name_offset(m, dev->set_mode); 219 SEQ_printf(m, "\n"); 220 221 SEQ_printf(m, " event_handler: "); 222 print_name_offset(m, dev->event_handler); 223 SEQ_printf(m, "\n"); 224 } 225 226 static void timer_list_show_tickdevices(struct seq_file *m) 227 { 228 int cpu; 229 230 #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]); 237 #endif 238 SEQ_printf(m, "\n"); 239 #endif 240 for_each_online_cpu(cpu) 241 print_tickdevice(m, tick_get_device(cpu), cpu); 242 SEQ_printf(m, "\n"); 243 } 244 #else 245 static void timer_list_show_tickdevices(struct seq_file *m) { } 246 #endif 247 248 static int timer_list_show(struct seq_file *m, void *v) 249 { 250 u64 now = ktime_to_ns(ktime_get()); 251 int cpu; 252 253 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); 256 257 for_each_online_cpu(cpu) 258 print_cpu(m, cpu, now); 259 260 SEQ_printf(m, "\n"); 261 timer_list_show_tickdevices(m); 262 263 return 0; 264 } 265 266 void sysrq_timer_list_show(void) 267 { 268 timer_list_show(NULL, NULL); 269 } 270 271 static int timer_list_open(struct inode *inode, struct file *filp) 272 { 273 return single_open(filp, timer_list_show, NULL); 274 } 275 276 static struct file_operations timer_list_fops = { 277 .open = timer_list_open, 278 .read = seq_read, 279 .llseek = seq_lseek, 280 .release = single_release, 281 }; 282 283 static int __init init_timer_list_procfs(void) 284 { 285 struct proc_dir_entry *pe; 286 287 pe = proc_create("timer_list", 0644, NULL, &timer_list_fops); 288 if (!pe) 289 return -ENOMEM; 290 return 0; 291 } 292 __initcall(init_timer_list_procfs); 293