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 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 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 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 #endif 154 #undef P 155 #undef P_ns 156 157 #ifdef CONFIG_TICK_ONESHOT 158 # define P(x) \ 159 SEQ_printf(m, " .%-15s: %Lu\n", #x, \ 160 (unsigned long long)(ts->x)) 161 # define P_ns(x) \ 162 SEQ_printf(m, " .%-15s: %Lu nsecs\n", #x, \ 163 (unsigned long long)(ktime_to_ns(ts->x))) 164 { 165 struct tick_sched *ts = tick_get_tick_sched(cpu); 166 P(nohz_mode); 167 P_ns(idle_tick); 168 P(tick_stopped); 169 P(idle_jiffies); 170 P(idle_calls); 171 P(idle_sleeps); 172 P_ns(idle_entrytime); 173 P_ns(idle_waketime); 174 P_ns(idle_exittime); 175 P_ns(idle_sleeptime); 176 P(last_jiffies); 177 P(next_jiffies); 178 P_ns(idle_expires); 179 SEQ_printf(m, "jiffies: %Lu\n", 180 (unsigned long long)jiffies); 181 } 182 #endif 183 184 #undef P 185 #undef P_ns 186 } 187 188 #ifdef CONFIG_GENERIC_CLOCKEVENTS 189 static void 190 print_tickdevice(struct seq_file *m, struct tick_device *td, int cpu) 191 { 192 struct clock_event_device *dev = td->evtdev; 193 194 SEQ_printf(m, "\n"); 195 SEQ_printf(m, "Tick Device: mode: %d\n", td->mode); 196 if (cpu < 0) 197 SEQ_printf(m, "Broadcast device\n"); 198 else 199 SEQ_printf(m, "Per CPU device: %d\n", cpu); 200 201 SEQ_printf(m, "Clock Event Device: "); 202 if (!dev) { 203 SEQ_printf(m, "<NULL>\n"); 204 return; 205 } 206 SEQ_printf(m, "%s\n", dev->name); 207 SEQ_printf(m, " max_delta_ns: %lu\n", dev->max_delta_ns); 208 SEQ_printf(m, " min_delta_ns: %lu\n", dev->min_delta_ns); 209 SEQ_printf(m, " mult: %lu\n", dev->mult); 210 SEQ_printf(m, " shift: %d\n", dev->shift); 211 SEQ_printf(m, " mode: %d\n", dev->mode); 212 SEQ_printf(m, " next_event: %Ld nsecs\n", 213 (unsigned long long) ktime_to_ns(dev->next_event)); 214 215 SEQ_printf(m, " set_next_event: "); 216 print_name_offset(m, dev->set_next_event); 217 SEQ_printf(m, "\n"); 218 219 SEQ_printf(m, " set_mode: "); 220 print_name_offset(m, dev->set_mode); 221 SEQ_printf(m, "\n"); 222 223 SEQ_printf(m, " event_handler: "); 224 print_name_offset(m, dev->event_handler); 225 SEQ_printf(m, "\n"); 226 } 227 228 static void timer_list_show_tickdevices(struct seq_file *m) 229 { 230 int cpu; 231 232 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST 233 print_tickdevice(m, tick_get_broadcast_device(), -1); 234 SEQ_printf(m, "tick_broadcast_mask: %08lx\n", 235 tick_get_broadcast_mask()->bits[0]); 236 #ifdef CONFIG_TICK_ONESHOT 237 SEQ_printf(m, "tick_broadcast_oneshot_mask: %08lx\n", 238 tick_get_broadcast_oneshot_mask()->bits[0]); 239 #endif 240 SEQ_printf(m, "\n"); 241 #endif 242 for_each_online_cpu(cpu) 243 print_tickdevice(m, tick_get_device(cpu), cpu); 244 SEQ_printf(m, "\n"); 245 } 246 #else 247 static void timer_list_show_tickdevices(struct seq_file *m) { } 248 #endif 249 250 static int timer_list_show(struct seq_file *m, void *v) 251 { 252 u64 now = ktime_to_ns(ktime_get()); 253 int cpu; 254 255 SEQ_printf(m, "Timer List Version: v0.4\n"); 256 SEQ_printf(m, "HRTIMER_MAX_CLOCK_BASES: %d\n", HRTIMER_MAX_CLOCK_BASES); 257 SEQ_printf(m, "now at %Ld nsecs\n", (unsigned long long)now); 258 259 for_each_online_cpu(cpu) 260 print_cpu(m, cpu, now); 261 262 SEQ_printf(m, "\n"); 263 timer_list_show_tickdevices(m); 264 265 return 0; 266 } 267 268 void sysrq_timer_list_show(void) 269 { 270 timer_list_show(NULL, NULL); 271 } 272 273 static int timer_list_open(struct inode *inode, struct file *filp) 274 { 275 return single_open(filp, timer_list_show, NULL); 276 } 277 278 static const struct file_operations timer_list_fops = { 279 .open = timer_list_open, 280 .read = seq_read, 281 .llseek = seq_lseek, 282 .release = single_release, 283 }; 284 285 static int __init init_timer_list_procfs(void) 286 { 287 struct proc_dir_entry *pe; 288 289 pe = proc_create("timer_list", 0444, NULL, &timer_list_fops); 290 if (!pe) 291 return -ENOMEM; 292 return 0; 293 } 294 __initcall(init_timer_list_procfs); 295