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: %Ld.%06ld\n", "load_avg",
 222                         SPLIT_NS(cfs_rq->load_avg));
 223         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", "load_period",
 224                         SPLIT_NS(cfs_rq->load_period));
 225         SEQ_printf(m, "  .%-30s: %ld\n", "load_contrib",
 226                         cfs_rq->load_contribution);
 227         SEQ_printf(m, "  .%-30s: %d\n", "load_tg",
 228                         atomic_read(&cfs_rq->tg->load_weight));
 229         SEQ_printf(m, "  .%-30s: %lld\n", "runnable_load_avg",
 230                         cfs_rq->runnable_load_avg);
 231         SEQ_printf(m, "  .%-30s: %lld\n", "blocked_load_avg",
 232                         cfs_rq->blocked_load_avg);
 233         SEQ_printf(m, "  .%-30s: %ld\n", "tg_load_avg",
 234                         atomic64_read(&cfs_rq->tg->load_avg));
 235         SEQ_printf(m, "  .%-30s: %lld\n", "tg_load_contrib",
 236                         cfs_rq->tg_load_contrib);
 237         SEQ_printf(m, "  .%-30s: %d\n", "tg_runnable_contrib",
 238                         cfs_rq->tg_runnable_contrib);
 239         SEQ_printf(m, "  .%-30s: %d\n", "tg->runnable_avg",
 240                         atomic_read(&cfs_rq->tg->runnable_avg));
 241 #endif
 242
 243         print_cfs_group_stats(m, cpu, cfs_rq->tg);
 244 #endif
 245 }
 246
 247 void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq)
 248 {
 249 #ifdef CONFIG_RT_GROUP_SCHED
 250         SEQ_printf(m, "\nrt_rq[%d]:%s\n", cpu, task_group_path(rt_rq->tg));
 251 #else
 252         SEQ_printf(m, "\nrt_rq[%d]:\n", cpu);
 253 #endif
 254
 255 #define P(x) \
 256         SEQ_printf(m, "  .%-30s: %Ld\n", #x, (long long)(rt_rq->x))
 257 #define PN(x) \
 258         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rt_rq->x))
 259
 260         P(rt_nr_running);
 261         P(rt_throttled);
 262         PN(rt_time);
 263         PN(rt_runtime);
 264
 265 #undef PN
 266 #undef P
 267 }
 268
 269 extern __read_mostly int sched_clock_running;
 270
 271 static void print_cpu(struct seq_file *m, int cpu)
 272 {
 273         struct rq *rq = cpu_rq(cpu);
 274         unsigned long flags;
 275
 276 #ifdef CONFIG_X86
 277         {
 278                 unsigned int freq = cpu_khz ? : 1;
 279
 280                 SEQ_printf(m, "\ncpu#%d, %u.%03u MHz\n",
 281                            cpu, freq / 1000, (freq % 1000));
 282         }
 283 #else
 284         SEQ_printf(m, "\ncpu#%d\n", cpu);
 285 #endif
 286
 287 #define P(x)                                                            \
 288 do {                                                                    \
 289         if (sizeof(rq->x) == 4)                                         \
 290                 SEQ_printf(m, "  .%-30s: %ld\n", #x, (long)(rq->x));    \
 291         else                                                            \
 292                 SEQ_printf(m, "  .%-30s: %Ld\n", #x, (long long)(rq->x));\
 293 } while (0)
 294
 295 #define PN(x) \
 296         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rq->x))
 297
 298         P(nr_running);
 299         SEQ_printf(m, "  .%-30s: %lu\n", "load",
 300                    rq->load.weight);
 301         P(nr_switches);
 302         P(nr_load_updates);
 303         P(nr_uninterruptible);
 304         PN(next_balance);
 305         P(curr->pid);
 306         PN(clock);
 307         P(cpu_load[0]);
 308         P(cpu_load[1]);
 309         P(cpu_load[2]);
 310         P(cpu_load[3]);
 311         P(cpu_load[4]);
 312 #undef P
 313 #undef PN
 314
 315 #ifdef CONFIG_SCHEDSTATS
 316 #define P(n) SEQ_printf(m, "  .%-30s: %d\n", #n, rq->n);
 317 #define P64(n) SEQ_printf(m, "  .%-30s: %Ld\n", #n, rq->n);
 318
 319         P(yld_count);
 320
 321         P(sched_count);
 322         P(sched_goidle);
 323 #ifdef CONFIG_SMP
 324         P64(avg_idle);
 325 #endif
 326
 327         P(ttwu_count);
 328         P(ttwu_local);
 329
 330 #undef P
 331 #undef P64
 332 #endif
 333         spin_lock_irqsave(&sched_debug_lock, flags);
 334         print_cfs_stats(m, cpu);
 335         print_rt_stats(m, cpu);
 336
 337         rcu_read_lock();
 338         print_rq(m, rq, cpu);
 339         rcu_read_unlock();
 340         spin_unlock_irqrestore(&sched_debug_lock, flags);
 341 }
 342
 343 static const char *sched_tunable_scaling_names[] = {
 344         "none",
 345         "logaritmic",
 346         "linear"
 347 };
 348
 349 static int sched_debug_show(struct seq_file *m, void *v)
 350 {
 351         u64 ktime, sched_clk, cpu_clk;
 352         unsigned long flags;
 353         int cpu;
 354
 355         local_irq_save(flags);
 356         ktime = ktime_to_ns(ktime_get());
 357         sched_clk = sched_clock();
 358         cpu_clk = local_clock();
 359         local_irq_restore(flags);
 360
 361         SEQ_printf(m, "Sched Debug Version: v0.10, %s %.*s\n",
 362                 init_utsname()->release,
 363                 (int)strcspn(init_utsname()->version, " "),
 364                 init_utsname()->version);
 365
 366 #define P(x) \
 367         SEQ_printf(m, "%-40s: %Ld\n", #x, (long long)(x))
 368 #define PN(x) \
 369         SEQ_printf(m, "%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x))
 370         PN(ktime);
 371         PN(sched_clk);
 372         PN(cpu_clk);
 373         P(jiffies);
 374 #ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
 375         P(sched_clock_stable);
 376 #endif
 377 #undef PN
 378 #undef P
 379
 380         SEQ_printf(m, "\n");
 381         SEQ_printf(m, "sysctl_sched\n");
 382
 383 #define P(x) \
 384         SEQ_printf(m, "  .%-40s: %Ld\n", #x, (long long)(x))
 385 #define PN(x) \
 386         SEQ_printf(m, "  .%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x))
 387         PN(sysctl_sched_latency);
 388         PN(sysctl_sched_min_granularity);
 389         PN(sysctl_sched_wakeup_granularity);
 390         P(sysctl_sched_child_runs_first);
 391         P(sysctl_sched_features);
 392 #undef PN
 393 #undef P
 394
 395         SEQ_printf(m, "  .%-40s: %d (%s)\n", "sysctl_sched_tunable_scaling",
 396                 sysctl_sched_tunable_scaling,
 397                 sched_tunable_scaling_names[sysctl_sched_tunable_scaling]);
 398
 399         for_each_online_cpu(cpu)
 400                 print_cpu(m, cpu);
 401
 402         SEQ_printf(m, "\n");
 403
 404         return 0;
 405 }
 406
 407 void sysrq_sched_debug_show(void)
 408 {
 409         sched_debug_show(NULL, NULL);
 410 }
 411
 412 static int sched_debug_open(struct inode *inode, struct file *filp)
 413 {
 414         return single_open(filp, sched_debug_show, NULL);
 415 }
 416
 417 static const struct file_operations sched_debug_fops = {
 418         .open           = sched_debug_open,
 419         .read           = seq_read,
 420         .llseek         = seq_lseek,
 421         .release        = single_release,
 422 };
 423
 424 static int __init init_sched_debug_procfs(void)
 425 {
 426         struct proc_dir_entry *pe;
 427
 428         pe = proc_create("sched_debug", 0444, NULL, &sched_debug_fops);
 429         if (!pe)
 430                 return -ENOMEM;
 431         return 0;
 432 }
 433
 434 __initcall(init_sched_debug_procfs);
 435
 436 void proc_sched_show_task(struct task_struct *p, struct seq_file *m)
 437 {
 438         unsigned long nr_switches;
 439
 440         SEQ_printf(m, "%s (%d, #threads: %d)\n", p->comm, p->pid,
 441                                                 get_nr_threads(p));
 442         SEQ_printf(m,
 443                 "---------------------------------------------------------\n");
 444 #define __P(F) \
 445         SEQ_printf(m, "%-35s:%21Ld\n", #F, (long long)F)
 446 #define P(F) \
 447         SEQ_printf(m, "%-35s:%21Ld\n", #F, (long long)p->F)
 448 #define __PN(F) \
 449         SEQ_printf(m, "%-35s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)F))
 450 #define PN(F) \
 451         SEQ_printf(m, "%-35s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)p->F))
 452
 453         PN(se.exec_start);
 454         PN(se.vruntime);
 455         PN(se.sum_exec_runtime);
 456
 457         nr_switches = p->nvcsw + p->nivcsw;
 458
 459 #ifdef CONFIG_SCHEDSTATS
 460         PN(se.statistics.wait_start);
 461         PN(se.statistics.sleep_start);
 462         PN(se.statistics.block_start);
 463         PN(se.statistics.sleep_max);
 464         PN(se.statistics.block_max);
 465         PN(se.statistics.exec_max);
 466         PN(se.statistics.slice_max);
 467         PN(se.statistics.wait_max);
 468         PN(se.statistics.wait_sum);
 469         P(se.statistics.wait_count);
 470         PN(se.statistics.iowait_sum);
 471         P(se.statistics.iowait_count);
 472         P(se.nr_migrations);
 473         P(se.statistics.nr_migrations_cold);
 474         P(se.statistics.nr_failed_migrations_affine);
 475         P(se.statistics.nr_failed_migrations_running);
 476         P(se.statistics.nr_failed_migrations_hot);
 477         P(se.statistics.nr_forced_migrations);
 478         P(se.statistics.nr_wakeups);
 479         P(se.statistics.nr_wakeups_sync);
 480         P(se.statistics.nr_wakeups_migrate);
 481         P(se.statistics.nr_wakeups_local);
 482         P(se.statistics.nr_wakeups_remote);
 483         P(se.statistics.nr_wakeups_affine);
 484         P(se.statistics.nr_wakeups_affine_attempts);
 485         P(se.statistics.nr_wakeups_passive);
 486         P(se.statistics.nr_wakeups_idle);
 487
 488         {
 489                 u64 avg_atom, avg_per_cpu;
 490
 491                 avg_atom = p->se.sum_exec_runtime;
 492                 if (nr_switches)
 493                         do_div(avg_atom, nr_switches);
 494                 else
 495                         avg_atom = -1LL;
 496
 497                 avg_per_cpu = p->se.sum_exec_runtime;
 498                 if (p->se.nr_migrations) {
 499                         avg_per_cpu = div64_u64(avg_per_cpu,
 500                                                 p->se.nr_migrations);
 501                 } else {
 502                         avg_per_cpu = -1LL;
 503                 }
 504
 505                 __PN(avg_atom);
 506                 __PN(avg_per_cpu);
 507         }
 508 #endif
 509         __P(nr_switches);
 510         SEQ_printf(m, "%-35s:%21Ld\n",
 511                    "nr_voluntary_switches", (long long)p->nvcsw);
 512         SEQ_printf(m, "%-35s:%21Ld\n",
 513                    "nr_involuntary_switches", (long long)p->nivcsw);
 514
 515         P(se.load.weight);
 516         P(policy);
 517         P(prio);
 518 #undef PN
 519 #undef __PN
 520 #undef P
 521 #undef __P
 522
 523         {
 524                 unsigned int this_cpu = raw_smp_processor_id();
 525                 u64 t0, t1;
 526
 527                 t0 = cpu_clock(this_cpu);
 528                 t1 = cpu_clock(this_cpu);
 529                 SEQ_printf(m, "%-35s:%21Ld\n",
 530                            "clock-delta", (long long)(t1-t0));
 531         }
 532 }
 533
 534 void proc_sched_set_task(struct task_struct *p)
 535 {
 536 #ifdef CONFIG_SCHEDSTATS
 537         memset(&p->se.statistics, 0, sizeof(p->se.statistics));
 538 #endif
 539 }