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   1 /*
   2  * kernel/time/sched_debug.c
   3  *
   4  * Print the CFS rbtree
   5  *
   6  * Copyright(C) 2007, 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/sched.h>
  15 #include <linux/seq_file.h>
  16 #include <linux/kallsyms.h>
  17 #include <linux/utsname.h>
  18
  19 /*
  20  * This allows printing both to /proc/sched_debug and
  21  * to the console
  22  */
  23 #define SEQ_printf(m, x...)                     \
  24  do {                                           \
  25         if (m)                                  \
  26                 seq_printf(m, x);               \
  27         else                                    \
  28                 printk(x);                      \
  29  } while (0)
  30
  31 static void
  32 print_task(struct seq_file *m, struct rq *rq, struct task_struct *p)
  33 {
  34         if (rq->curr == p)
  35                 SEQ_printf(m, "R");
  36         else
  37                 SEQ_printf(m, " ");
  38
  39         SEQ_printf(m, "%15s %5d %15Ld %13Ld %13Ld %9Ld %5d ",
  40                 p->comm, p->pid,
  41                 (long long)p->se.fair_key,
  42                 (long long)(p->se.fair_key - rq->cfs.fair_clock),
  43                 (long long)p->se.wait_runtime,
  44                 (long long)(p->nvcsw + p->nivcsw),
  45                 p->prio);
  46 #ifdef CONFIG_SCHEDSTATS
  47         SEQ_printf(m, "%15Ld %15Ld %15Ld %15Ld %15Ld %15Ld\n",
  48                 (long long)p->se.vruntime,
  49                 (long long)p->se.sum_exec_runtime,
  50                 (long long)p->se.sum_wait_runtime,
  51                 (long long)p->se.sum_sleep_runtime,
  52                 (long long)p->se.wait_runtime_overruns,
  53                 (long long)p->se.wait_runtime_underruns);
  54 #else
  55         SEQ_printf(m, "%15Ld %15Ld %15Ld %15Ld %15Ld\n",
  56                 0LL, 0LL, 0LL, 0LL, 0LL);
  57 #endif
  58 }
  59
  60 static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu)
  61 {
  62         struct task_struct *g, *p;
  63
  64         SEQ_printf(m,
  65         "\nrunnable tasks:\n"
  66         "            task   PID        tree-key         delta       waiting"
  67         "  switches  prio"
  68         "    exec-runtime        sum-exec        sum-wait       sum-sleep"
  69         "    wait-overrun   wait-underrun\n"
  70         "------------------------------------------------------------------"
  71         "--------------------------------"
  72         "------------------------------------------------"
  73         "--------------------------------\n");
  74
  75         read_lock_irq(&tasklist_lock);
  76
  77         do_each_thread(g, p) {
  78                 if (!p->se.on_rq || task_cpu(p) != rq_cpu)
  79                         continue;
  80
  81                 print_task(m, rq, p);
  82         } while_each_thread(g, p);
  83
  84         read_unlock_irq(&tasklist_lock);
  85 }
  86
  87 static void
  88 print_cfs_rq_runtime_sum(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
  89 {
  90         s64 wait_runtime_rq_sum = 0;
  91         struct task_struct *p;
  92         struct rb_node *curr;
  93         unsigned long flags;
  94         struct rq *rq = &per_cpu(runqueues, cpu);
  95
  96         spin_lock_irqsave(&rq->lock, flags);
  97         curr = first_fair(cfs_rq);
  98         while (curr) {
  99                 p = rb_entry(curr, struct task_struct, se.run_node);
 100                 wait_runtime_rq_sum += p->se.wait_runtime;
 101
 102                 curr = rb_next(curr);
 103         }
 104         spin_unlock_irqrestore(&rq->lock, flags);
 105
 106         SEQ_printf(m, "  .%-30s: %Ld\n", "wait_runtime_rq_sum",
 107                 (long long)wait_runtime_rq_sum);
 108 }
 109
 110 void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
 111 {
 112         s64 MIN_vruntime = -1, max_vruntime = -1, spread;
 113         struct rq *rq = &per_cpu(runqueues, cpu);
 114         struct sched_entity *last;
 115         unsigned long flags;
 116
 117         SEQ_printf(m, "\ncfs_rq\n");
 118
 119 #define P(x) \
 120         SEQ_printf(m, "  .%-30s: %Ld\n", #x, (long long)(cfs_rq->x))
 121
 122         P(fair_clock);
 123         P(exec_clock);
 124         P(min_vruntime);
 125
 126         spin_lock_irqsave(&rq->lock, flags);
 127         if (cfs_rq->rb_leftmost)
 128                 MIN_vruntime = (__pick_next_entity(cfs_rq))->vruntime;
 129         last = __pick_last_entity(cfs_rq);
 130         if (last)
 131                 max_vruntime = last->vruntime;
 132         spin_unlock_irqrestore(&rq->lock, flags);
 133         SEQ_printf(m, "  .%-30s: %Ld\n", "MIN_vruntime",
 134                         (long long)MIN_vruntime);
 135         SEQ_printf(m, "  .%-30s: %Ld\n", "max_vruntime",
 136                         (long long)max_vruntime);
 137         spread = max_vruntime - MIN_vruntime;
 138         SEQ_printf(m, "  .%-30s: %Ld\n", "spread",
 139                         (long long)spread);
 140
 141         P(wait_runtime);
 142         P(wait_runtime_overruns);
 143         P(wait_runtime_underruns);
 144         P(sleeper_bonus);
 145 #undef P
 146
 147         print_cfs_rq_runtime_sum(m, cpu, cfs_rq);
 148 }
 149
 150 static void print_cpu(struct seq_file *m, int cpu)
 151 {
 152         struct rq *rq = &per_cpu(runqueues, cpu);
 153
 154 #ifdef CONFIG_X86
 155         {
 156                 unsigned int freq = cpu_khz ? : 1;
 157
 158                 SEQ_printf(m, "\ncpu#%d, %u.%03u MHz\n",
 159                            cpu, freq / 1000, (freq % 1000));
 160         }
 161 #else
 162         SEQ_printf(m, "\ncpu#%d\n", cpu);
 163 #endif
 164
 165 #define P(x) \
 166         SEQ_printf(m, "  .%-30s: %Ld\n", #x, (long long)(rq->x))
 167
 168         P(nr_running);
 169         SEQ_printf(m, "  .%-30s: %lu\n", "load",
 170                    rq->ls.load.weight);
 171         P(nr_switches);
 172         P(nr_load_updates);
 173         P(nr_uninterruptible);
 174         SEQ_printf(m, "  .%-30s: %lu\n", "jiffies", jiffies);
 175         P(next_balance);
 176         P(curr->pid);
 177         P(clock);
 178         P(idle_clock);
 179         P(prev_clock_raw);
 180         P(clock_warps);
 181         P(clock_overflows);
 182         P(clock_deep_idle_events);
 183         P(clock_max_delta);
 184         P(cpu_load[0]);
 185         P(cpu_load[1]);
 186         P(cpu_load[2]);
 187         P(cpu_load[3]);
 188         P(cpu_load[4]);
 189 #undef P
 190
 191         print_cfs_stats(m, cpu);
 192
 193         print_rq(m, rq, cpu);
 194 }
 195
 196 static int sched_debug_show(struct seq_file *m, void *v)
 197 {
 198         u64 now = ktime_to_ns(ktime_get());
 199         int cpu;
 200
 201         SEQ_printf(m, "Sched Debug Version: v0.05-v20, %s %.*s\n",
 202                 init_utsname()->release,
 203                 (int)strcspn(init_utsname()->version, " "),
 204                 init_utsname()->version);
 205
 206         SEQ_printf(m, "now at %Lu nsecs\n", (unsigned long long)now);
 207
 208         for_each_online_cpu(cpu)
 209                 print_cpu(m, cpu);
 210
 211         SEQ_printf(m, "\n");
 212
 213         return 0;
 214 }
 215
 216 static void sysrq_sched_debug_show(void)
 217 {
 218         sched_debug_show(NULL, NULL);
 219 }
 220
 221 static int sched_debug_open(struct inode *inode, struct file *filp)
 222 {
 223         return single_open(filp, sched_debug_show, NULL);
 224 }
 225
 226 static struct file_operations sched_debug_fops = {
 227         .open           = sched_debug_open,
 228         .read           = seq_read,
 229         .llseek         = seq_lseek,
 230         .release        = single_release,
 231 };
 232
 233 static int __init init_sched_debug_procfs(void)
 234 {
 235         struct proc_dir_entry *pe;
 236
 237         pe = create_proc_entry("sched_debug", 0644, NULL);
 238         if (!pe)
 239                 return -ENOMEM;
 240
 241         pe->proc_fops = &sched_debug_fops;
 242
 243         return 0;
 244 }
 245
 246 __initcall(init_sched_debug_procfs);
 247
 248 void proc_sched_show_task(struct task_struct *p, struct seq_file *m)
 249 {
 250         unsigned long flags;
 251         int num_threads = 1;
 252
 253         rcu_read_lock();
 254         if (lock_task_sighand(p, &flags)) {
 255                 num_threads = atomic_read(&p->signal->count);
 256                 unlock_task_sighand(p, &flags);
 257         }
 258         rcu_read_unlock();
 259
 260         SEQ_printf(m, "%s (%d, #threads: %d)\n", p->comm, p->pid, num_threads);
 261         SEQ_printf(m, "----------------------------------------------\n");
 262 #define P(F) \
 263         SEQ_printf(m, "%-25s:%20Ld\n", #F, (long long)p->F)
 264
 265         P(se.wait_runtime);
 266         P(se.wait_start_fair);
 267         P(se.exec_start);
 268         P(se.sleep_start_fair);
 269         P(se.vruntime);
 270         P(se.sum_exec_runtime);
 271
 272 #ifdef CONFIG_SCHEDSTATS
 273         P(se.wait_start);
 274         P(se.sleep_start);
 275         P(se.block_start);
 276         P(se.sleep_max);
 277         P(se.block_max);
 278         P(se.exec_max);
 279         P(se.slice_max);
 280         P(se.wait_max);
 281         P(se.wait_runtime_overruns);
 282         P(se.wait_runtime_underruns);
 283         P(se.sum_wait_runtime);
 284 #endif
 285         SEQ_printf(m, "%-25s:%20Ld\n",
 286                    "nr_switches", (long long)(p->nvcsw + p->nivcsw));
 287         P(se.load.weight);
 288         P(policy);
 289         P(prio);
 290 #undef P
 291
 292         {
 293                 u64 t0, t1;
 294
 295                 t0 = sched_clock();
 296                 t1 = sched_clock();
 297                 SEQ_printf(m, "%-25s:%20Ld\n",
 298                            "clock-delta", (long long)(t1-t0));
 299         }
 300 }
 301
 302 void proc_sched_set_task(struct task_struct *p)
 303 {
 304 #ifdef CONFIG_SCHEDSTATS
 305         p->se.sleep_max                 = 0;
 306         p->se.block_max                 = 0;
 307         p->se.exec_max                  = 0;
 308         p->se.slice_max                 = 0;
 309         p->se.wait_max                  = 0;
 310         p->se.wait_runtime_overruns     = 0;
 311         p->se.wait_runtime_underruns    = 0;
 312 #endif
 313         p->se.sum_exec_runtime          = 0;
 314         p->se.prev_sum_exec_runtime     = 0;
 315 }