kernel/sched/debug.c

   1 /*
   2  * kernel/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 #include "sched.h"
  20
  21 static DEFINE_SPINLOCK(sched_debug_lock);
  22
  23 /*
  24  * This allows printing both to /proc/sched_debug and
  25  * to the console
  26  */
  27 #define SEQ_printf(m, x...)                     \
  28  do {                                           \
  29         if (m)                                  \
  30                 seq_printf(m, x);               \
  31         else                                    \
  32                 printk(x);                      \
  33  } while (0)
  34
  35 /*
  36  * Ease the printing of nsec fields:
  37  */
  38 static long long nsec_high(unsigned long long nsec)
  39 {
  40         if ((long long)nsec < 0) {
  41                 nsec = -nsec;
  42                 do_div(nsec, 1000000);
  43                 return -nsec;
  44         }
  45         do_div(nsec, 1000000);
  46
  47         return nsec;
  48 }
  49
  50 static unsigned long nsec_low(unsigned long long nsec)
  51 {
  52         if ((long long)nsec < 0)
  53                 nsec = -nsec;
  54
  55         return do_div(nsec, 1000000);
  56 }
  57
  58 #define SPLIT_NS(x) nsec_high(x), nsec_low(x)
  59
  60 #ifdef CONFIG_FAIR_GROUP_SCHED
  61 static void print_cfs_group_stats(struct seq_file *m, int cpu, struct task_group *tg)
  62 {
  63         struct sched_entity *se = tg->se[cpu];
  64
  65 #define P(F) \
  66         SEQ_printf(m, "  .%-30s: %lld\n", #F, (long long)F)
  67 #define PN(F) \
  68         SEQ_printf(m, "  .%-30s: %lld.%06ld\n", #F, SPLIT_NS((long long)F))
  69
  70         if (!se) {
  71                 struct sched_avg *avg = &cpu_rq(cpu)->avg;
  72                 P(avg->runnable_avg_sum);
  73                 P(avg->runnable_avg_period);
  74                 return;
  75         }
  76
  77
  78         PN(se->exec_start);
  79         PN(se->vruntime);
  80         PN(se->sum_exec_runtime);
  81 #ifdef CONFIG_SCHEDSTATS
  82         PN(se->statistics.wait_start);
  83         PN(se->statistics.sleep_start);
  84         PN(se->statistics.block_start);
  85         PN(se->statistics.sleep_max);
  86         PN(se->statistics.block_max);
  87         PN(se->statistics.exec_max);
  88         PN(se->statistics.slice_max);
  89         PN(se->statistics.wait_max);
  90         PN(se->statistics.wait_sum);
  91         P(se->statistics.wait_count);
  92 #endif
  93         P(se->load.weight);
  94 #ifdef CONFIG_SMP
  95         P(se->avg.runnable_avg_sum);
  96         P(se->avg.runnable_avg_period);
  97         P(se->avg.load_avg_contrib);
  98         P(se->avg.decay_count);
  99 #endif
 100 #undef PN
 101 #undef P
 102 }
 103 #endif
 104
 105 #ifdef CONFIG_CGROUP_SCHED
 106 static char group_path[PATH_MAX];
 107
 108 static char *task_group_path(struct task_group *tg)
 109 {
 110         if (autogroup_path(tg, group_path, PATH_MAX))
 111                 return group_path;
 112
 113         /*
 114          * May be NULL if the underlying cgroup isn't fully-created yet
 115          */
 116         if (!tg->css.cgroup) {
 117                 group_path[0] = '\0';
 118                 return group_path;
 119         }
 120         cgroup_path(tg->css.cgroup, group_path, PATH_MAX);
 121         return group_path;
 122 }
 123 #endif
 124
 125 static void
 126 print_task(struct seq_file *m, struct rq *rq, struct task_struct *p)
 127 {
 128         if (rq->curr == p)
 129                 SEQ_printf(m, "R");
 130         else
 131                 SEQ_printf(m, " ");
 132
 133         SEQ_printf(m, "%15s %5d %9Ld.%06ld %9Ld %5d ",
 134                 p->comm, p->pid,
 135                 SPLIT_NS(p->se.vruntime),
 136                 (long long)(p->nvcsw + p->nivcsw),
 137                 p->prio);
 138 #ifdef CONFIG_SCHEDSTATS
 139         SEQ_printf(m, "%9Ld.%06ld %9Ld.%06ld %9Ld.%06ld",
 140                 SPLIT_NS(p->se.vruntime),
 141                 SPLIT_NS(p->se.sum_exec_runtime),
 142                 SPLIT_NS(p->se.statistics.sum_sleep_runtime));
 143 #else
 144         SEQ_printf(m, "%15Ld %15Ld %15Ld.%06ld %15Ld.%06ld %15Ld.%06ld",
 145                 0LL, 0LL, 0LL, 0L, 0LL, 0L, 0LL, 0L);
 146 #endif
 147 #ifdef CONFIG_CGROUP_SCHED
 148         SEQ_printf(m, " %s", task_group_path(task_group(p)));
 149 #endif
 150
 151         SEQ_printf(m, "\n");
 152 }
 153
 154 static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu)
 155 {
 156         struct task_struct *g, *p;
 157         unsigned long flags;
 158
 159         SEQ_printf(m,
 160         "\nrunnable tasks:\n"
 161         "            task   PID         tree-key  switches  prio"
 162         "     exec-runtime         sum-exec        sum-sleep\n"
 163         "------------------------------------------------------"
 164         "----------------------------------------------------\n");
 165
 166         read_lock_irqsave(&tasklist_lock, flags);
 167
 168         do_each_thread(g, p) {
 169                 if (!p->on_rq || task_cpu(p) != rq_cpu)
 170                         continue;
 171
 172                 print_task(m, rq, p);
 173         } while_each_thread(g, p);
 174
 175         read_unlock_irqrestore(&tasklist_lock, flags);
 176 }
 177
 178 void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
 179 {
 180         s64 MIN_vruntime = -1, min_vruntime, max_vruntime = -1,
 181                 spread, rq0_min_vruntime, spread0;
 182         struct rq *rq = cpu_rq(cpu);
 183         struct sched_entity *last;
 184         unsigned long flags;
 185
 186 #ifdef CONFIG_FAIR_GROUP_SCHED
 187         SEQ_printf(m, "\ncfs_rq[%d]:%s\n", cpu, task_group_path(cfs_rq->tg));
 188 #else
 189         SEQ_printf(m, "\ncfs_rq[%d]:\n", cpu);
 190 #endif
 191         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", "exec_clock",
 192                         SPLIT_NS(cfs_rq->exec_clock));
 193
 194         raw_spin_lock_irqsave(&rq->lock, flags);
 195         if (cfs_rq->rb_leftmost)
 196                 MIN_vruntime = (__pick_first_entity(cfs_rq))->vruntime;
 197         last = __pick_last_entity(cfs_rq);
 198         if (last)
 199                 max_vruntime = last->vruntime;
 200         min_vruntime = cfs_rq->min_vruntime;
 201         rq0_min_vruntime = cpu_rq(0)->cfs.min_vruntime;
 202         raw_spin_unlock_irqrestore(&rq->lock, flags);
 203         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", "MIN_vruntime",
 204                         SPLIT_NS(MIN_vruntime));
 205         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", "min_vruntime",
 206                         SPLIT_NS(min_vruntime));
 207         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", "max_vruntime",
 208                         SPLIT_NS(max_vruntime));
 209         spread = max_vruntime - MIN_vruntime;
 210         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", "spread",
 211                         SPLIT_NS(spread));
 212         spread0 = min_vruntime - rq0_min_vruntime;
 213         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", "spread0",
 214                         SPLIT_NS(spread0));
 215         SEQ_printf(m, "  .%-30s: %d\n", "nr_spread_over",
 216                         cfs_rq->nr_spread_over);
 217         SEQ_printf(m, "  .%-30s: %d\n", "nr_running", cfs_rq->nr_running);
 218         SEQ_printf(m, "  .%-30s: %ld\n", "load", cfs_rq->load.weight);
 219 #ifdef CONFIG_FAIR_GROUP_SCHED
 220 #ifdef CONFIG_SMP
 221         SEQ_printf(m, "  .%-30s: %lld\n", "runnable_load_avg",
 222                         cfs_rq->runnable_load_avg);
 223         SEQ_printf(m, "  .%-30s: %lld\n", "blocked_load_avg",
 224                         cfs_rq->blocked_load_avg);
 225         SEQ_printf(m, "  .%-30s: %ld\n", "tg_load_avg",
 226                         atomic64_read(&cfs_rq->tg->load_avg));
 227         SEQ_printf(m, "  .%-30s: %lld\n", "tg_load_contrib",
 228                         cfs_rq->tg_load_contrib);
 229         SEQ_printf(m, "  .%-30s: %d\n", "tg_runnable_contrib",
 230                         cfs_rq->tg_runnable_contrib);
 231         SEQ_printf(m, "  .%-30s: %d\n", "tg->runnable_avg",
 232                         atomic_read(&cfs_rq->tg->runnable_avg));
 233 #endif
 234
 235         print_cfs_group_stats(m, cpu, cfs_rq->tg);
 236 #endif
 237 }
 238
 239 void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq)
 240 {
 241 #ifdef CONFIG_RT_GROUP_SCHED
 242         SEQ_printf(m, "\nrt_rq[%d]:%s\n", cpu, task_group_path(rt_rq->tg));
 243 #else
 244         SEQ_printf(m, "\nrt_rq[%d]:\n", cpu);
 245 #endif
 246
 247 #define P(x) \
 248         SEQ_printf(m, "  .%-30s: %Ld\n", #x, (long long)(rt_rq->x))
 249 #define PN(x) \
 250         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rt_rq->x))
 251
 252         P(rt_nr_running);
 253         P(rt_throttled);
 254         PN(rt_time);
 255         PN(rt_runtime);
 256
 257 #undef PN
 258 #undef P
 259 }
 260
 261 extern __read_mostly int sched_clock_running;
 262
 263 static void print_cpu(struct seq_file *m, int cpu)
 264 {
 265         struct rq *rq = cpu_rq(cpu);
 266         unsigned long flags;
 267
 268 #ifdef CONFIG_X86
 269         {
 270                 unsigned int freq = cpu_khz ? : 1;
 271
 272                 SEQ_printf(m, "\ncpu#%d, %u.%03u MHz\n",
 273                            cpu, freq / 1000, (freq % 1000));
 274         }
 275 #else
 276         SEQ_printf(m, "\ncpu#%d\n", cpu);
 277 #endif
 278
 279 #define P(x)                                                            \
 280 do {                                                                    \
 281         if (sizeof(rq->x) == 4)                                         \
 282                 SEQ_printf(m, "  .%-30s: %ld\n", #x, (long)(rq->x));    \
 283         else                                                            \
 284                 SEQ_printf(m, "  .%-30s: %Ld\n", #x, (long long)(rq->x));\
 285 } while (0)
 286
 287 #define PN(x) \
 288         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rq->x))
 289
 290         P(nr_running);
 291         SEQ_printf(m, "  .%-30s: %lu\n", "load",
 292                    rq->load.weight);
 293         P(nr_switches);
 294         P(nr_load_updates);
 295         P(nr_uninterruptible);
 296         PN(next_balance);
 297         P(curr->pid);
 298         PN(clock);
 299         P(cpu_load[0]);
 300         P(cpu_load[1]);
 301         P(cpu_load[2]);
 302         P(cpu_load[3]);
 303         P(cpu_load[4]);
 304 #undef P
 305 #undef PN
 306
 307 #ifdef CONFIG_SCHEDSTATS
 308 #define P(n) SEQ_printf(m, "  .%-30s: %d\n", #n, rq->n);
 309 #define P64(n) SEQ_printf(m, "  .%-30s: %Ld\n", #n, rq->n);
 310
 311         P(yld_count);
 312
 313         P(sched_count);
 314         P(sched_goidle);
 315 #ifdef CONFIG_SMP
 316         P64(avg_idle);
 317 #endif
 318
 319         P(ttwu_count);
 320         P(ttwu_local);
 321
 322 #undef P
 323 #undef P64
 324 #endif
 325         spin_lock_irqsave(&sched_debug_lock, flags);
 326         print_cfs_stats(m, cpu);
 327         print_rt_stats(m, cpu);
 328
 329         rcu_read_lock();
 330         print_rq(m, rq, cpu);
 331         rcu_read_unlock();
 332         spin_unlock_irqrestore(&sched_debug_lock, flags);
 333 }
 334
 335 static const char *sched_tunable_scaling_names[] = {
 336         "none",
 337         "logaritmic",
 338         "linear"
 339 };
 340
 341 static int sched_debug_show(struct seq_file *m, void *v)
 342 {
 343         u64 ktime, sched_clk, cpu_clk;
 344         unsigned long flags;
 345         int cpu;
 346
 347         local_irq_save(flags);
 348         ktime = ktime_to_ns(ktime_get());
 349         sched_clk = sched_clock();
 350         cpu_clk = local_clock();
 351         local_irq_restore(flags);
 352
 353         SEQ_printf(m, "Sched Debug Version: v0.10, %s %.*s\n",
 354                 init_utsname()->release,
 355                 (int)strcspn(init_utsname()->version, " "),
 356                 init_utsname()->version);
 357
 358 #define P(x) \
 359         SEQ_printf(m, "%-40s: %Ld\n", #x, (long long)(x))
 360 #define PN(x) \
 361         SEQ_printf(m, "%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x))
 362         PN(ktime);
 363         PN(sched_clk);
 364         PN(cpu_clk);
 365         P(jiffies);
 366 #ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
 367         P(sched_clock_stable);
 368 #endif
 369 #undef PN
 370 #undef P
 371
 372         SEQ_printf(m, "\n");
 373         SEQ_printf(m, "sysctl_sched\n");
 374
 375 #define P(x) \
 376         SEQ_printf(m, "  .%-40s: %Ld\n", #x, (long long)(x))
 377 #define PN(x) \
 378         SEQ_printf(m, "  .%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x))
 379         PN(sysctl_sched_latency);
 380         PN(sysctl_sched_min_granularity);
 381         PN(sysctl_sched_wakeup_granularity);
 382         P(sysctl_sched_child_runs_first);
 383         P(sysctl_sched_features);
 384 #undef PN
 385 #undef P
 386
 387         SEQ_printf(m, "  .%-40s: %d (%s)\n", "sysctl_sched_tunable_scaling",
 388                 sysctl_sched_tunable_scaling,
 389                 sched_tunable_scaling_names[sysctl_sched_tunable_scaling]);
 390
 391         for_each_online_cpu(cpu)
 392                 print_cpu(m, cpu);
 393
 394         SEQ_printf(m, "\n");
 395
 396         return 0;
 397 }
 398
 399 void sysrq_sched_debug_show(void)
 400 {
 401         sched_debug_show(NULL, NULL);
 402 }
 403
 404 static int sched_debug_open(struct inode *inode, struct file *filp)
 405 {
 406         return single_open(filp, sched_debug_show, NULL);
 407 }
 408
 409 static const struct file_operations sched_debug_fops = {
 410         .open           = sched_debug_open,
 411         .read           = seq_read,
 412         .llseek         = seq_lseek,
 413         .release        = single_release,
 414 };
 415
 416 static int __init init_sched_debug_procfs(void)
 417 {
 418         struct proc_dir_entry *pe;
 419
 420         pe = proc_create("sched_debug", 0444, NULL, &sched_debug_fops);
 421         if (!pe)
 422                 return -ENOMEM;
 423         return 0;
 424 }
 425
 426 __initcall(init_sched_debug_procfs);
 427
 428 void proc_sched_show_task(struct task_struct *p, struct seq_file *m)
 429 {
 430         unsigned long nr_switches;
 431
 432         SEQ_printf(m, "%s (%d, #threads: %d)\n", p->comm, p->pid,
 433                                                 get_nr_threads(p));
 434         SEQ_printf(m,
 435                 "---------------------------------------------------------\n");
 436 #define __P(F) \
 437         SEQ_printf(m, "%-35s:%21Ld\n", #F, (long long)F)
 438 #define P(F) \
 439         SEQ_printf(m, "%-35s:%21Ld\n", #F, (long long)p->F)
 440 #define __PN(F) \
 441         SEQ_printf(m, "%-35s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)F))
 442 #define PN(F) \
 443         SEQ_printf(m, "%-35s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)p->F))
 444
 445         PN(se.exec_start);
 446         PN(se.vruntime);
 447         PN(se.sum_exec_runtime);
 448
 449         nr_switches = p->nvcsw + p->nivcsw;
 450
 451 #ifdef CONFIG_SCHEDSTATS
 452         PN(se.statistics.wait_start);
 453         PN(se.statistics.sleep_start);
 454         PN(se.statistics.block_start);
 455         PN(se.statistics.sleep_max);
 456         PN(se.statistics.block_max);
 457         PN(se.statistics.exec_max);
 458         PN(se.statistics.slice_max);
 459         PN(se.statistics.wait_max);
 460         PN(se.statistics.wait_sum);
 461         P(se.statistics.wait_count);
 462         PN(se.statistics.iowait_sum);
 463         P(se.statistics.iowait_count);
 464         P(se.nr_migrations);
 465         P(se.statistics.nr_migrations_cold);
 466         P(se.statistics.nr_failed_migrations_affine);
 467         P(se.statistics.nr_failed_migrations_running);
 468         P(se.statistics.nr_failed_migrations_hot);
 469         P(se.statistics.nr_forced_migrations);
 470         P(se.statistics.nr_wakeups);
 471         P(se.statistics.nr_wakeups_sync);
 472         P(se.statistics.nr_wakeups_migrate);
 473         P(se.statistics.nr_wakeups_local);
 474         P(se.statistics.nr_wakeups_remote);
 475         P(se.statistics.nr_wakeups_affine);
 476         P(se.statistics.nr_wakeups_affine_attempts);
 477         P(se.statistics.nr_wakeups_passive);
 478         P(se.statistics.nr_wakeups_idle);
 479
 480         {
 481                 u64 avg_atom, avg_per_cpu;
 482
 483                 avg_atom = p->se.sum_exec_runtime;
 484                 if (nr_switches)
 485                         do_div(avg_atom, nr_switches);
 486                 else
 487                         avg_atom = -1LL;
 488
 489                 avg_per_cpu = p->se.sum_exec_runtime;
 490                 if (p->se.nr_migrations) {
 491                         avg_per_cpu = div64_u64(avg_per_cpu,
 492                                                 p->se.nr_migrations);
 493                 } else {
 494                         avg_per_cpu = -1LL;
 495                 }
 496
 497                 __PN(avg_atom);
 498                 __PN(avg_per_cpu);
 499         }
 500 #endif
 501         __P(nr_switches);
 502         SEQ_printf(m, "%-35s:%21Ld\n",
 503                    "nr_voluntary_switches", (long long)p->nvcsw);
 504         SEQ_printf(m, "%-35s:%21Ld\n",
 505                    "nr_involuntary_switches", (long long)p->nivcsw);
 506
 507         P(se.load.weight);
 508         P(policy);
 509         P(prio);
 510 #undef PN
 511 #undef __PN
 512 #undef P
 513 #undef __P
 514
 515         {
 516                 unsigned int this_cpu = raw_smp_processor_id();
 517                 u64 t0, t1;
 518
 519                 t0 = cpu_clock(this_cpu);
 520                 t1 = cpu_clock(this_cpu);
 521                 SEQ_printf(m, "%-35s:%21Ld\n",
 522                            "clock-delta", (long long)(t1-t0));
 523         }
 524 }
 525
 526 void proc_sched_set_task(struct task_struct *p)
 527 {
 528 #ifdef CONFIG_SCHEDSTATS
 529         memset(&p->se.statistics, 0, sizeof(p->se.statistics));
 530 #endif
 531 }