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