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+1]; 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 *timer, int idx, u64 now) 51 { 52 #ifdef CONFIG_TIMER_STATS 53 char tmp[TASK_COMM_LEN + 1]; 54 #endif 55 SEQ_printf(m, " #%d: ", idx); 56 print_name_offset(m, timer); 57 SEQ_printf(m, ", "); 58 print_name_offset(m, timer->function); 59 SEQ_printf(m, ", S:%02lx", timer->state); 60 #ifdef CONFIG_TIMER_STATS 61 SEQ_printf(m, ", "); 62 print_name_offset(m, timer->start_site); 63 memcpy(tmp, timer->start_comm, TASK_COMM_LEN); 64 tmp[TASK_COMM_LEN] = 0; 65 SEQ_printf(m, ", %s/%d", tmp, timer->start_pid); 66 #endif 67 SEQ_printf(m, "\n"); 68 SEQ_printf(m, " # expires at %Ld nsecs [in %Ld nsecs]\n", 69 (unsigned long long)ktime_to_ns(timer->expires), 70 (unsigned long long)(ktime_to_ns(timer->expires) - now)); 71 } 72 73 static void 74 print_active_timers(struct seq_file *m, struct hrtimer_clock_base *base, 75 u64 now) 76 { 77 struct hrtimer *timer, tmp; 78 unsigned long next = 0, i; 79 struct rb_node *curr; 80 unsigned long flags; 81 82 next_one: 83 i = 0; 84 spin_lock_irqsave(&base->cpu_base->lock, flags); 85 86 curr = base->first; 87 /* 88 * Crude but we have to do this O(N*N) thing, because 89 * we have to unlock the base when printing: 90 */ 91 while (curr && i < next) { 92 curr = rb_next(curr); 93 i++; 94 } 95 96 if (curr) { 97 98 timer = rb_entry(curr, struct hrtimer, node); 99 tmp = *timer; 100 spin_unlock_irqrestore(&base->cpu_base->lock, flags); 101 102 print_timer(m, &tmp, i, now); 103 next++; 104 goto next_one; 105 } 106 spin_unlock_irqrestore(&base->cpu_base->lock, flags); 107 } 108 109 static void 110 print_base(struct seq_file *m, struct hrtimer_clock_base *base, u64 now) 111 { 112 SEQ_printf(m, " .index: %d\n", 113 base->index); 114 SEQ_printf(m, " .resolution: %Ld nsecs\n", 115 (unsigned long long)ktime_to_ns(base->resolution)); 116 SEQ_printf(m, " .get_time: "); 117 print_name_offset(m, base->get_time); 118 SEQ_printf(m, "\n"); 119 #ifdef CONFIG_HIGH_RES_TIMERS 120 SEQ_printf(m, " .offset: %Ld nsecs\n", 121 ktime_to_ns(base->offset)); 122 #endif 123 SEQ_printf(m, "active timers:\n"); 124 print_active_timers(m, base, now); 125 } 126 127 static void print_cpu(struct seq_file *m, int cpu, u64 now) 128 { 129 struct hrtimer_cpu_base *cpu_base = &per_cpu(hrtimer_bases, cpu); 130 int i; 131 132 SEQ_printf(m, "\ncpu: %d\n", cpu); 133 for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) { 134 SEQ_printf(m, " clock %d:\n", i); 135 print_base(m, cpu_base->clock_base + i, now); 136 } 137 #define P(x) \ 138 SEQ_printf(m, " .%-15s: %Ld\n", #x, (u64)(cpu_base->x)) 139 #define P_ns(x) \ 140 SEQ_printf(m, " .%-15s: %Ld nsecs\n", #x, \ 141 (u64)(ktime_to_ns(cpu_base->x))) 142 143 #ifdef CONFIG_HIGH_RES_TIMERS 144 P_ns(expires_next); 145 P(hres_active); 146 P(nr_events); 147 #endif 148 #undef P 149 #undef P_ns 150 151 #ifdef CONFIG_TICK_ONESHOT 152 # define P(x) \ 153 SEQ_printf(m, " .%-15s: %Ld\n", #x, (u64)(ts->x)) 154 # define P_ns(x) \ 155 SEQ_printf(m, " .%-15s: %Ld nsecs\n", #x, \ 156 (u64)(ktime_to_ns(ts->x))) 157 { 158 struct tick_sched *ts = tick_get_tick_sched(cpu); 159 P(nohz_mode); 160 P_ns(idle_tick); 161 P(tick_stopped); 162 P(idle_jiffies); 163 P(idle_calls); 164 P(idle_sleeps); 165 P_ns(idle_entrytime); 166 P_ns(idle_sleeptime); 167 P(last_jiffies); 168 P(next_jiffies); 169 P_ns(idle_expires); 170 SEQ_printf(m, "jiffies: %Ld\n", (u64)jiffies); 171 } 172 #endif 173 174 #undef P 175 #undef P_ns 176 } 177 178 #ifdef CONFIG_GENERIC_CLOCKEVENTS 179 static void 180 print_tickdevice(struct seq_file *m, struct tick_device *td) 181 { 182 struct clock_event_device *dev = td->evtdev; 183 184 SEQ_printf(m, "\nTick Device: mode: %d\n", td->mode); 185 186 SEQ_printf(m, "Clock Event Device: "); 187 if (!dev) { 188 SEQ_printf(m, "<NULL>\n"); 189 return; 190 } 191 SEQ_printf(m, "%s\n", dev->name); 192 SEQ_printf(m, " max_delta_ns: %lu\n", dev->max_delta_ns); 193 SEQ_printf(m, " min_delta_ns: %lu\n", dev->min_delta_ns); 194 SEQ_printf(m, " mult: %lu\n", dev->mult); 195 SEQ_printf(m, " shift: %d\n", dev->shift); 196 SEQ_printf(m, " mode: %d\n", dev->mode); 197 SEQ_printf(m, " next_event: %Ld nsecs\n", 198 (unsigned long long) ktime_to_ns(dev->next_event)); 199 200 SEQ_printf(m, " set_next_event: "); 201 print_name_offset(m, dev->set_next_event); 202 SEQ_printf(m, "\n"); 203 204 SEQ_printf(m, " set_mode: "); 205 print_name_offset(m, dev->set_mode); 206 SEQ_printf(m, "\n"); 207 208 SEQ_printf(m, " event_handler: "); 209 print_name_offset(m, dev->event_handler); 210 SEQ_printf(m, "\n"); 211 } 212 213 static void timer_list_show_tickdevices(struct seq_file *m) 214 { 215 int cpu; 216 217 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST 218 print_tickdevice(m, tick_get_broadcast_device()); 219 SEQ_printf(m, "tick_broadcast_mask: %08lx\n", 220 tick_get_broadcast_mask()->bits[0]); 221 #ifdef CONFIG_TICK_ONESHOT 222 SEQ_printf(m, "tick_broadcast_oneshot_mask: %08lx\n", 223 tick_get_broadcast_oneshot_mask()->bits[0]); 224 #endif 225 SEQ_printf(m, "\n"); 226 #endif 227 for_each_online_cpu(cpu) 228 print_tickdevice(m, tick_get_device(cpu)); 229 SEQ_printf(m, "\n"); 230 } 231 #else 232 static void timer_list_show_tickdevices(struct seq_file *m) { } 233 #endif 234 235 static int timer_list_show(struct seq_file *m, void *v) 236 { 237 u64 now = ktime_to_ns(ktime_get()); 238 int cpu; 239 240 SEQ_printf(m, "Timer List Version: v0.3\n"); 241 SEQ_printf(m, "HRTIMER_MAX_CLOCK_BASES: %d\n", HRTIMER_MAX_CLOCK_BASES); 242 SEQ_printf(m, "now at %Ld nsecs\n", (unsigned long long)now); 243 244 for_each_online_cpu(cpu) 245 print_cpu(m, cpu, now); 246 247 SEQ_printf(m, "\n"); 248 timer_list_show_tickdevices(m); 249 250 return 0; 251 } 252 253 void sysrq_timer_list_show(void) 254 { 255 timer_list_show(NULL, NULL); 256 } 257 258 static int timer_list_open(struct inode *inode, struct file *filp) 259 { 260 return single_open(filp, timer_list_show, NULL); 261 } 262 263 static struct file_operations timer_list_fops = { 264 .open = timer_list_open, 265 .read = seq_read, 266 .llseek = seq_lseek, 267 .release = seq_release, 268 }; 269 270 static int __init init_timer_list_procfs(void) 271 { 272 struct proc_dir_entry *pe; 273 274 pe = create_proc_entry("timer_list", 0644, NULL); 275 if (!pe) 276 return -ENOMEM; 277 278 pe->proc_fops = &timer_list_fops; 279 280 return 0; 281 } 282 __initcall(init_timer_list_procfs); 283