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/mm.h>
  15 #include <linux/sched/task.h>
  16 #include <linux/seq_file.h>
  17 #include <linux/kallsyms.h>
  18 #include <linux/utsname.h>
  19 #include <linux/mempolicy.h>
  20 #include <linux/debugfs.h>
  21
  22 #include "sched.h"
  23
  24 static DEFINE_SPINLOCK(sched_debug_lock);
  25
  26 /*
  27  * This allows printing both to /proc/sched_debug and
  28  * to the console
  29  */
  30 #define SEQ_printf(m, x...)                     \
  31  do {                                           \
  32         if (m)                                  \
  33                 seq_printf(m, x);               \
  34         else                                    \
  35                 printk(x);                      \
  36  } while (0)
  37
  38 /*
  39  * Ease the printing of nsec fields:
  40  */
  41 static long long nsec_high(unsigned long long nsec)
  42 {
  43         if ((long long)nsec < 0) {
  44                 nsec = -nsec;
  45                 do_div(nsec, 1000000);
  46                 return -nsec;
  47         }
  48         do_div(nsec, 1000000);
  49
  50         return nsec;
  51 }
  52
  53 static unsigned long nsec_low(unsigned long long nsec)
  54 {
  55         if ((long long)nsec < 0)
  56                 nsec = -nsec;
  57
  58         return do_div(nsec, 1000000);
  59 }
  60
  61 #define SPLIT_NS(x) nsec_high(x), nsec_low(x)
  62
  63 #define SCHED_FEAT(name, enabled)       \
  64         #name ,
  65
  66 static const char * const sched_feat_names[] = {
  67 #include "features.h"
  68 };
  69
  70 #undef SCHED_FEAT
  71
  72 static int sched_feat_show(struct seq_file *m, void *v)
  73 {
  74         int i;
  75
  76         for (i = 0; i < __SCHED_FEAT_NR; i++) {
  77                 if (!(sysctl_sched_features & (1UL << i)))
  78                         seq_puts(m, "NO_");
  79                 seq_printf(m, "%s ", sched_feat_names[i]);
  80         }
  81         seq_puts(m, "\n");
  82
  83         return 0;
  84 }
  85
  86 #ifdef HAVE_JUMP_LABEL
  87
  88 #define jump_label_key__true  STATIC_KEY_INIT_TRUE
  89 #define jump_label_key__false STATIC_KEY_INIT_FALSE
  90
  91 #define SCHED_FEAT(name, enabled)       \
  92         jump_label_key__##enabled ,
  93
  94 struct static_key sched_feat_keys[__SCHED_FEAT_NR] = {
  95 #include "features.h"
  96 };
  97
  98 #undef SCHED_FEAT
  99
 100 static void sched_feat_disable(int i)
 101 {
 102         static_key_disable(&sched_feat_keys[i]);
 103 }
 104
 105 static void sched_feat_enable(int i)
 106 {
 107         static_key_enable(&sched_feat_keys[i]);
 108 }
 109 #else
 110 static void sched_feat_disable(int i) { };
 111 static void sched_feat_enable(int i) { };
 112 #endif /* HAVE_JUMP_LABEL */
 113
 114 static int sched_feat_set(char *cmp)
 115 {
 116         int i;
 117         int neg = 0;
 118
 119         if (strncmp(cmp, "NO_", 3) == 0) {
 120                 neg = 1;
 121                 cmp += 3;
 122         }
 123
 124         for (i = 0; i < __SCHED_FEAT_NR; i++) {
 125                 if (strcmp(cmp, sched_feat_names[i]) == 0) {
 126                         if (neg) {
 127                                 sysctl_sched_features &= ~(1UL << i);
 128                                 sched_feat_disable(i);
 129                         } else {
 130                                 sysctl_sched_features |= (1UL << i);
 131                                 sched_feat_enable(i);
 132                         }
 133                         break;
 134                 }
 135         }
 136
 137         return i;
 138 }
 139
 140 static ssize_t
 141 sched_feat_write(struct file *filp, const char __user *ubuf,
 142                 size_t cnt, loff_t *ppos)
 143 {
 144         char buf[64];
 145         char *cmp;
 146         int i;
 147         struct inode *inode;
 148
 149         if (cnt > 63)
 150                 cnt = 63;
 151
 152         if (copy_from_user(&buf, ubuf, cnt))
 153                 return -EFAULT;
 154
 155         buf[cnt] = 0;
 156         cmp = strstrip(buf);
 157
 158         /* Ensure the static_key remains in a consistent state */
 159         inode = file_inode(filp);
 160         inode_lock(inode);
 161         i = sched_feat_set(cmp);
 162         inode_unlock(inode);
 163         if (i == __SCHED_FEAT_NR)
 164                 return -EINVAL;
 165
 166         *ppos += cnt;
 167
 168         return cnt;
 169 }
 170
 171 static int sched_feat_open(struct inode *inode, struct file *filp)
 172 {
 173         return single_open(filp, sched_feat_show, NULL);
 174 }
 175
 176 static const struct file_operations sched_feat_fops = {
 177         .open           = sched_feat_open,
 178         .write          = sched_feat_write,
 179         .read           = seq_read,
 180         .llseek         = seq_lseek,
 181         .release        = single_release,
 182 };
 183
 184 static __init int sched_init_debug(void)
 185 {
 186         debugfs_create_file("sched_features", 0644, NULL, NULL,
 187                         &sched_feat_fops);
 188
 189         return 0;
 190 }
 191 late_initcall(sched_init_debug);
 192
 193 #ifdef CONFIG_SMP
 194
 195 #ifdef CONFIG_SYSCTL
 196
 197 static struct ctl_table sd_ctl_dir[] = {
 198         {
 199                 .procname       = "sched_domain",
 200                 .mode           = 0555,
 201         },
 202         {}
 203 };
 204
 205 static struct ctl_table sd_ctl_root[] = {
 206         {
 207                 .procname       = "kernel",
 208                 .mode           = 0555,
 209                 .child          = sd_ctl_dir,
 210         },
 211         {}
 212 };
 213
 214 static struct ctl_table *sd_alloc_ctl_entry(int n)
 215 {
 216         struct ctl_table *entry =
 217                 kcalloc(n, sizeof(struct ctl_table), GFP_KERNEL);
 218
 219         return entry;
 220 }
 221
 222 static void sd_free_ctl_entry(struct ctl_table **tablep)
 223 {
 224         struct ctl_table *entry;
 225
 226         /*
 227          * In the intermediate directories, both the child directory and
 228          * procname are dynamically allocated and could fail but the mode
 229          * will always be set. In the lowest directory the names are
 230          * static strings and all have proc handlers.
 231          */
 232         for (entry = *tablep; entry->mode; entry++) {
 233                 if (entry->child)
 234                         sd_free_ctl_entry(&entry->child);
 235                 if (entry->proc_handler == NULL)
 236                         kfree(entry->procname);
 237         }
 238
 239         kfree(*tablep);
 240         *tablep = NULL;
 241 }
 242
 243 static int min_load_idx = 0;
 244 static int max_load_idx = CPU_LOAD_IDX_MAX-1;
 245
 246 static void
 247 set_table_entry(struct ctl_table *entry,
 248                 const char *procname, void *data, int maxlen,
 249                 umode_t mode, proc_handler *proc_handler,
 250                 bool load_idx)
 251 {
 252         entry->procname = procname;
 253         entry->data = data;
 254         entry->maxlen = maxlen;
 255         entry->mode = mode;
 256         entry->proc_handler = proc_handler;
 257
 258         if (load_idx) {
 259                 entry->extra1 = &min_load_idx;
 260                 entry->extra2 = &max_load_idx;
 261         }
 262 }
 263
 264 static struct ctl_table *
 265 sd_alloc_ctl_domain_table(struct sched_domain *sd)
 266 {
 267         struct ctl_table *table = sd_alloc_ctl_entry(14);
 268
 269         if (table == NULL)
 270                 return NULL;
 271
 272         set_table_entry(&table[0], "min_interval", &sd->min_interval,
 273                 sizeof(long), 0644, proc_doulongvec_minmax, false);
 274         set_table_entry(&table[1], "max_interval", &sd->max_interval,
 275                 sizeof(long), 0644, proc_doulongvec_minmax, false);
 276         set_table_entry(&table[2], "busy_idx", &sd->busy_idx,
 277                 sizeof(int), 0644, proc_dointvec_minmax, true);
 278         set_table_entry(&table[3], "idle_idx", &sd->idle_idx,
 279                 sizeof(int), 0644, proc_dointvec_minmax, true);
 280         set_table_entry(&table[4], "newidle_idx", &sd->newidle_idx,
 281                 sizeof(int), 0644, proc_dointvec_minmax, true);
 282         set_table_entry(&table[5], "wake_idx", &sd->wake_idx,
 283                 sizeof(int), 0644, proc_dointvec_minmax, true);
 284         set_table_entry(&table[6], "forkexec_idx", &sd->forkexec_idx,
 285                 sizeof(int), 0644, proc_dointvec_minmax, true);
 286         set_table_entry(&table[7], "busy_factor", &sd->busy_factor,
 287                 sizeof(int), 0644, proc_dointvec_minmax, false);
 288         set_table_entry(&table[8], "imbalance_pct", &sd->imbalance_pct,
 289                 sizeof(int), 0644, proc_dointvec_minmax, false);
 290         set_table_entry(&table[9], "cache_nice_tries",
 291                 &sd->cache_nice_tries,
 292                 sizeof(int), 0644, proc_dointvec_minmax, false);
 293         set_table_entry(&table[10], "flags", &sd->flags,
 294                 sizeof(int), 0644, proc_dointvec_minmax, false);
 295         set_table_entry(&table[11], "max_newidle_lb_cost",
 296                 &sd->max_newidle_lb_cost,
 297                 sizeof(long), 0644, proc_doulongvec_minmax, false);
 298         set_table_entry(&table[12], "name", sd->name,
 299                 CORENAME_MAX_SIZE, 0444, proc_dostring, false);
 300         /* &table[13] is terminator */
 301
 302         return table;
 303 }
 304
 305 static struct ctl_table *sd_alloc_ctl_cpu_table(int cpu)
 306 {
 307         struct ctl_table *entry, *table;
 308         struct sched_domain *sd;
 309         int domain_num = 0, i;
 310         char buf[32];
 311
 312         for_each_domain(cpu, sd)
 313                 domain_num++;
 314         entry = table = sd_alloc_ctl_entry(domain_num + 1);
 315         if (table == NULL)
 316                 return NULL;
 317
 318         i = 0;
 319         for_each_domain(cpu, sd) {
 320                 snprintf(buf, 32, "domain%d", i);
 321                 entry->procname = kstrdup(buf, GFP_KERNEL);
 322                 entry->mode = 0555;
 323                 entry->child = sd_alloc_ctl_domain_table(sd);
 324                 entry++;
 325                 i++;
 326         }
 327         return table;
 328 }
 329
 330 static struct ctl_table_header *sd_sysctl_header;
 331 void register_sched_domain_sysctl(void)
 332 {
 333         int i, cpu_num = num_possible_cpus();
 334         struct ctl_table *entry = sd_alloc_ctl_entry(cpu_num + 1);
 335         char buf[32];
 336
 337         WARN_ON(sd_ctl_dir[0].child);
 338         sd_ctl_dir[0].child = entry;
 339
 340         if (entry == NULL)
 341                 return;
 342
 343         for_each_possible_cpu(i) {
 344                 snprintf(buf, 32, "cpu%d", i);
 345                 entry->procname = kstrdup(buf, GFP_KERNEL);
 346                 entry->mode = 0555;
 347                 entry->child = sd_alloc_ctl_cpu_table(i);
 348                 entry++;
 349         }
 350
 351         WARN_ON(sd_sysctl_header);
 352         sd_sysctl_header = register_sysctl_table(sd_ctl_root);
 353 }
 354
 355 /* may be called multiple times per register */
 356 void unregister_sched_domain_sysctl(void)
 357 {
 358         unregister_sysctl_table(sd_sysctl_header);
 359         sd_sysctl_header = NULL;
 360         if (sd_ctl_dir[0].child)
 361                 sd_free_ctl_entry(&sd_ctl_dir[0].child);
 362 }
 363 #endif /* CONFIG_SYSCTL */
 364 #endif /* CONFIG_SMP */
 365
 366 #ifdef CONFIG_FAIR_GROUP_SCHED
 367 static void print_cfs_group_stats(struct seq_file *m, int cpu, struct task_group *tg)
 368 {
 369         struct sched_entity *se = tg->se[cpu];
 370
 371 #define P(F) \
 372         SEQ_printf(m, "  .%-30s: %lld\n", #F, (long long)F)
 373 #define P_SCHEDSTAT(F) \
 374         SEQ_printf(m, "  .%-30s: %lld\n", #F, (long long)schedstat_val(F))
 375 #define PN(F) \
 376         SEQ_printf(m, "  .%-30s: %lld.%06ld\n", #F, SPLIT_NS((long long)F))
 377 #define PN_SCHEDSTAT(F) \
 378         SEQ_printf(m, "  .%-30s: %lld.%06ld\n", #F, SPLIT_NS((long long)schedstat_val(F)))
 379
 380         if (!se)
 381                 return;
 382
 383         PN(se->exec_start);
 384         PN(se->vruntime);
 385         PN(se->sum_exec_runtime);
 386         if (schedstat_enabled()) {
 387                 PN_SCHEDSTAT(se->statistics.wait_start);
 388                 PN_SCHEDSTAT(se->statistics.sleep_start);
 389                 PN_SCHEDSTAT(se->statistics.block_start);
 390                 PN_SCHEDSTAT(se->statistics.sleep_max);
 391                 PN_SCHEDSTAT(se->statistics.block_max);
 392                 PN_SCHEDSTAT(se->statistics.exec_max);
 393                 PN_SCHEDSTAT(se->statistics.slice_max);
 394                 PN_SCHEDSTAT(se->statistics.wait_max);
 395                 PN_SCHEDSTAT(se->statistics.wait_sum);
 396                 P_SCHEDSTAT(se->statistics.wait_count);
 397         }
 398         P(se->load.weight);
 399 #ifdef CONFIG_SMP
 400         P(se->avg.load_avg);
 401         P(se->avg.util_avg);
 402 #endif
 403
 404 #undef PN_SCHEDSTAT
 405 #undef PN
 406 #undef P_SCHEDSTAT
 407 #undef P
 408 }
 409 #endif
 410
 411 #ifdef CONFIG_CGROUP_SCHED
 412 static char group_path[PATH_MAX];
 413
 414 static char *task_group_path(struct task_group *tg)
 415 {
 416         if (autogroup_path(tg, group_path, PATH_MAX))
 417                 return group_path;
 418
 419         cgroup_path(tg->css.cgroup, group_path, PATH_MAX);
 420         return group_path;
 421 }
 422 #endif
 423
 424 static void
 425 print_task(struct seq_file *m, struct rq *rq, struct task_struct *p)
 426 {
 427         if (rq->curr == p)
 428                 SEQ_printf(m, "R");
 429         else
 430                 SEQ_printf(m, " ");
 431
 432         SEQ_printf(m, "%15s %5d %9Ld.%06ld %9Ld %5d ",
 433                 p->comm, task_pid_nr(p),
 434                 SPLIT_NS(p->se.vruntime),
 435                 (long long)(p->nvcsw + p->nivcsw),
 436                 p->prio);
 437
 438         SEQ_printf(m, "%9Ld.%06ld %9Ld.%06ld %9Ld.%06ld",
 439                 SPLIT_NS(schedstat_val_or_zero(p->se.statistics.wait_sum)),
 440                 SPLIT_NS(p->se.sum_exec_runtime),
 441                 SPLIT_NS(schedstat_val_or_zero(p->se.statistics.sum_sleep_runtime)));
 442
 443 #ifdef CONFIG_NUMA_BALANCING
 444         SEQ_printf(m, " %d %d", task_node(p), task_numa_group_id(p));
 445 #endif
 446 #ifdef CONFIG_CGROUP_SCHED
 447         SEQ_printf(m, " %s", task_group_path(task_group(p)));
 448 #endif
 449
 450         SEQ_printf(m, "\n");
 451 }
 452
 453 static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu)
 454 {
 455         struct task_struct *g, *p;
 456
 457         SEQ_printf(m,
 458         "\nrunnable tasks:\n"
 459         "            task   PID         tree-key  switches  prio"
 460         "     wait-time             sum-exec        sum-sleep\n"
 461         "------------------------------------------------------"
 462         "----------------------------------------------------\n");
 463
 464         rcu_read_lock();
 465         for_each_process_thread(g, p) {
 466                 if (task_cpu(p) != rq_cpu)
 467                         continue;
 468
 469                 print_task(m, rq, p);
 470         }
 471         rcu_read_unlock();
 472 }
 473
 474 void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
 475 {
 476         s64 MIN_vruntime = -1, min_vruntime, max_vruntime = -1,
 477                 spread, rq0_min_vruntime, spread0;
 478         struct rq *rq = cpu_rq(cpu);
 479         struct sched_entity *last;
 480         unsigned long flags;
 481
 482 #ifdef CONFIG_FAIR_GROUP_SCHED
 483         SEQ_printf(m, "\ncfs_rq[%d]:%s\n", cpu, task_group_path(cfs_rq->tg));
 484 #else
 485         SEQ_printf(m, "\ncfs_rq[%d]:\n", cpu);
 486 #endif
 487         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", "exec_clock",
 488                         SPLIT_NS(cfs_rq->exec_clock));
 489
 490         raw_spin_lock_irqsave(&rq->lock, flags);
 491         if (cfs_rq->rb_leftmost)
 492                 MIN_vruntime = (__pick_first_entity(cfs_rq))->vruntime;
 493         last = __pick_last_entity(cfs_rq);
 494         if (last)
 495                 max_vruntime = last->vruntime;
 496         min_vruntime = cfs_rq->min_vruntime;
 497         rq0_min_vruntime = cpu_rq(0)->cfs.min_vruntime;
 498         raw_spin_unlock_irqrestore(&rq->lock, flags);
 499         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", "MIN_vruntime",
 500                         SPLIT_NS(MIN_vruntime));
 501         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", "min_vruntime",
 502                         SPLIT_NS(min_vruntime));
 503         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", "max_vruntime",
 504                         SPLIT_NS(max_vruntime));
 505         spread = max_vruntime - MIN_vruntime;
 506         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", "spread",
 507                         SPLIT_NS(spread));
 508         spread0 = min_vruntime - rq0_min_vruntime;
 509         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", "spread0",
 510                         SPLIT_NS(spread0));
 511         SEQ_printf(m, "  .%-30s: %d\n", "nr_spread_over",
 512                         cfs_rq->nr_spread_over);
 513         SEQ_printf(m, "  .%-30s: %d\n", "nr_running", cfs_rq->nr_running);
 514         SEQ_printf(m, "  .%-30s: %ld\n", "load", cfs_rq->load.weight);
 515 #ifdef CONFIG_SMP
 516         SEQ_printf(m, "  .%-30s: %lu\n", "load_avg",
 517                         cfs_rq->avg.load_avg);
 518         SEQ_printf(m, "  .%-30s: %lu\n", "runnable_load_avg",
 519                         cfs_rq->runnable_load_avg);
 520         SEQ_printf(m, "  .%-30s: %lu\n", "util_avg",
 521                         cfs_rq->avg.util_avg);
 522         SEQ_printf(m, "  .%-30s: %ld\n", "removed_load_avg",
 523                         atomic_long_read(&cfs_rq->removed_load_avg));
 524         SEQ_printf(m, "  .%-30s: %ld\n", "removed_util_avg",
 525                         atomic_long_read(&cfs_rq->removed_util_avg));
 526 #ifdef CONFIG_FAIR_GROUP_SCHED
 527         SEQ_printf(m, "  .%-30s: %lu\n", "tg_load_avg_contrib",
 528                         cfs_rq->tg_load_avg_contrib);
 529         SEQ_printf(m, "  .%-30s: %ld\n", "tg_load_avg",
 530                         atomic_long_read(&cfs_rq->tg->load_avg));
 531 #endif
 532 #endif
 533 #ifdef CONFIG_CFS_BANDWIDTH
 534         SEQ_printf(m, "  .%-30s: %d\n", "throttled",
 535                         cfs_rq->throttled);
 536         SEQ_printf(m, "  .%-30s: %d\n", "throttle_count",
 537                         cfs_rq->throttle_count);
 538 #endif
 539
 540 #ifdef CONFIG_FAIR_GROUP_SCHED
 541         print_cfs_group_stats(m, cpu, cfs_rq->tg);
 542 #endif
 543 }
 544
 545 void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq)
 546 {
 547 #ifdef CONFIG_RT_GROUP_SCHED
 548         SEQ_printf(m, "\nrt_rq[%d]:%s\n", cpu, task_group_path(rt_rq->tg));
 549 #else
 550         SEQ_printf(m, "\nrt_rq[%d]:\n", cpu);
 551 #endif
 552
 553 #define P(x) \
 554         SEQ_printf(m, "  .%-30s: %Ld\n", #x, (long long)(rt_rq->x))
 555 #define PN(x) \
 556         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rt_rq->x))
 557
 558         P(rt_nr_running);
 559         P(rt_throttled);
 560         PN(rt_time);
 561         PN(rt_runtime);
 562
 563 #undef PN
 564 #undef P
 565 }
 566
 567 void print_dl_rq(struct seq_file *m, int cpu, struct dl_rq *dl_rq)
 568 {
 569         struct dl_bw *dl_bw;
 570
 571         SEQ_printf(m, "\ndl_rq[%d]:\n", cpu);
 572         SEQ_printf(m, "  .%-30s: %ld\n", "dl_nr_running", dl_rq->dl_nr_running);
 573 #ifdef CONFIG_SMP
 574         dl_bw = &cpu_rq(cpu)->rd->dl_bw;
 575 #else
 576         dl_bw = &dl_rq->dl_bw;
 577 #endif
 578         SEQ_printf(m, "  .%-30s: %lld\n", "dl_bw->bw", dl_bw->bw);
 579         SEQ_printf(m, "  .%-30s: %lld\n", "dl_bw->total_bw", dl_bw->total_bw);
 580 }
 581
 582 extern __read_mostly int sched_clock_running;
 583
 584 static void print_cpu(struct seq_file *m, int cpu)
 585 {
 586         struct rq *rq = cpu_rq(cpu);
 587         unsigned long flags;
 588
 589 #ifdef CONFIG_X86
 590         {
 591                 unsigned int freq = cpu_khz ? : 1;
 592
 593                 SEQ_printf(m, "cpu#%d, %u.%03u MHz\n",
 594                            cpu, freq / 1000, (freq % 1000));
 595         }
 596 #else
 597         SEQ_printf(m, "cpu#%d\n", cpu);
 598 #endif
 599
 600 #define P(x)                                                            \
 601 do {                                                                    \
 602         if (sizeof(rq->x) == 4)                                         \
 603                 SEQ_printf(m, "  .%-30s: %ld\n", #x, (long)(rq->x));    \
 604         else                                                            \
 605                 SEQ_printf(m, "  .%-30s: %Ld\n", #x, (long long)(rq->x));\
 606 } while (0)
 607
 608 #define PN(x) \
 609         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rq->x))
 610
 611         P(nr_running);
 612         SEQ_printf(m, "  .%-30s: %lu\n", "load",
 613                    rq->load.weight);
 614         P(nr_switches);
 615         P(nr_load_updates);
 616         P(nr_uninterruptible);
 617         PN(next_balance);
 618         SEQ_printf(m, "  .%-30s: %ld\n", "curr->pid", (long)(task_pid_nr(rq->curr)));
 619         PN(clock);
 620         PN(clock_task);
 621         P(cpu_load[0]);
 622         P(cpu_load[1]);
 623         P(cpu_load[2]);
 624         P(cpu_load[3]);
 625         P(cpu_load[4]);
 626 #undef P
 627 #undef PN
 628
 629 #ifdef CONFIG_SMP
 630 #define P64(n) SEQ_printf(m, "  .%-30s: %Ld\n", #n, rq->n);
 631         P64(avg_idle);
 632         P64(max_idle_balance_cost);
 633 #undef P64
 634 #endif
 635
 636 #define P(n) SEQ_printf(m, "  .%-30s: %d\n", #n, schedstat_val(rq->n));
 637         if (schedstat_enabled()) {
 638                 P(yld_count);
 639                 P(sched_count);
 640                 P(sched_goidle);
 641                 P(ttwu_count);
 642                 P(ttwu_local);
 643         }
 644 #undef P
 645
 646         spin_lock_irqsave(&sched_debug_lock, flags);
 647         print_cfs_stats(m, cpu);
 648         print_rt_stats(m, cpu);
 649         print_dl_stats(m, cpu);
 650
 651         print_rq(m, rq, cpu);
 652         spin_unlock_irqrestore(&sched_debug_lock, flags);
 653         SEQ_printf(m, "\n");
 654 }
 655
 656 static const char *sched_tunable_scaling_names[] = {
 657         "none",
 658         "logaritmic",
 659         "linear"
 660 };
 661
 662 static void sched_debug_header(struct seq_file *m)
 663 {
 664         u64 ktime, sched_clk, cpu_clk;
 665         unsigned long flags;
 666
 667         local_irq_save(flags);
 668         ktime = ktime_to_ns(ktime_get());
 669         sched_clk = sched_clock();
 670         cpu_clk = local_clock();
 671         local_irq_restore(flags);
 672
 673         SEQ_printf(m, "Sched Debug Version: v0.11, %s %.*s\n",
 674                 init_utsname()->release,
 675                 (int)strcspn(init_utsname()->version, " "),
 676                 init_utsname()->version);
 677
 678 #define P(x) \
 679         SEQ_printf(m, "%-40s: %Ld\n", #x, (long long)(x))
 680 #define PN(x) \
 681         SEQ_printf(m, "%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x))
 682         PN(ktime);
 683         PN(sched_clk);
 684         PN(cpu_clk);
 685         P(jiffies);
 686 #ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
 687         P(sched_clock_stable());
 688 #endif
 689 #undef PN
 690 #undef P
 691
 692         SEQ_printf(m, "\n");
 693         SEQ_printf(m, "sysctl_sched\n");
 694
 695 #define P(x) \
 696         SEQ_printf(m, "  .%-40s: %Ld\n", #x, (long long)(x))
 697 #define PN(x) \
 698         SEQ_printf(m, "  .%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x))
 699         PN(sysctl_sched_latency);
 700         PN(sysctl_sched_min_granularity);
 701         PN(sysctl_sched_wakeup_granularity);
 702         P(sysctl_sched_child_runs_first);
 703         P(sysctl_sched_features);
 704 #undef PN
 705 #undef P
 706
 707         SEQ_printf(m, "  .%-40s: %d (%s)\n",
 708                 "sysctl_sched_tunable_scaling",
 709                 sysctl_sched_tunable_scaling,
 710                 sched_tunable_scaling_names[sysctl_sched_tunable_scaling]);
 711         SEQ_printf(m, "\n");
 712 }
 713
 714 static int sched_debug_show(struct seq_file *m, void *v)
 715 {
 716         int cpu = (unsigned long)(v - 2);
 717
 718         if (cpu != -1)
 719                 print_cpu(m, cpu);
 720         else
 721                 sched_debug_header(m);
 722
 723         return 0;
 724 }
 725
 726 void sysrq_sched_debug_show(void)
 727 {
 728         int cpu;
 729
 730         sched_debug_header(NULL);
 731         for_each_online_cpu(cpu)
 732                 print_cpu(NULL, cpu);
 733
 734 }
 735
 736 /*
 737  * This itererator needs some explanation.
 738  * It returns 1 for the header position.
 739  * This means 2 is cpu 0.
 740  * In a hotplugged system some cpus, including cpu 0, may be missing so we have
 741  * to use cpumask_* to iterate over the cpus.
 742  */
 743 static void *sched_debug_start(struct seq_file *file, loff_t *offset)
 744 {
 745         unsigned long n = *offset;
 746
 747         if (n == 0)
 748                 return (void *) 1;
 749
 750         n--;
 751
 752         if (n > 0)
 753                 n = cpumask_next(n - 1, cpu_online_mask);
 754         else
 755                 n = cpumask_first(cpu_online_mask);
 756
 757         *offset = n + 1;
 758
 759         if (n < nr_cpu_ids)
 760                 return (void *)(unsigned long)(n + 2);
 761         return NULL;
 762 }
 763
 764 static void *sched_debug_next(struct seq_file *file, void *data, loff_t *offset)
 765 {
 766         (*offset)++;
 767         return sched_debug_start(file, offset);
 768 }
 769
 770 static void sched_debug_stop(struct seq_file *file, void *data)
 771 {
 772 }
 773
 774 static const struct seq_operations sched_debug_sops = {
 775         .start = sched_debug_start,
 776         .next = sched_debug_next,
 777         .stop = sched_debug_stop,
 778         .show = sched_debug_show,
 779 };
 780
 781 static int sched_debug_release(struct inode *inode, struct file *file)
 782 {
 783         seq_release(inode, file);
 784
 785         return 0;
 786 }
 787
 788 static int sched_debug_open(struct inode *inode, struct file *filp)
 789 {
 790         int ret = 0;
 791
 792         ret = seq_open(filp, &sched_debug_sops);
 793
 794         return ret;
 795 }
 796
 797 static const struct file_operations sched_debug_fops = {
 798         .open           = sched_debug_open,
 799         .read           = seq_read,
 800         .llseek         = seq_lseek,
 801         .release        = sched_debug_release,
 802 };
 803
 804 static int __init init_sched_debug_procfs(void)
 805 {
 806         struct proc_dir_entry *pe;
 807
 808         pe = proc_create("sched_debug", 0444, NULL, &sched_debug_fops);
 809         if (!pe)
 810                 return -ENOMEM;
 811         return 0;
 812 }
 813
 814 __initcall(init_sched_debug_procfs);
 815
 816 #define __P(F) \
 817         SEQ_printf(m, "%-45s:%21Ld\n", #F, (long long)F)
 818 #define P(F) \
 819         SEQ_printf(m, "%-45s:%21Ld\n", #F, (long long)p->F)
 820 #define __PN(F) \
 821         SEQ_printf(m, "%-45s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)F))
 822 #define PN(F) \
 823         SEQ_printf(m, "%-45s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)p->F))
 824
 825
 826 #ifdef CONFIG_NUMA_BALANCING
 827 void print_numa_stats(struct seq_file *m, int node, unsigned long tsf,
 828                 unsigned long tpf, unsigned long gsf, unsigned long gpf)
 829 {
 830         SEQ_printf(m, "numa_faults node=%d ", node);
 831         SEQ_printf(m, "task_private=%lu task_shared=%lu ", tsf, tpf);
 832         SEQ_printf(m, "group_private=%lu group_shared=%lu\n", gsf, gpf);
 833 }
 834 #endif
 835
 836
 837 static void sched_show_numa(struct task_struct *p, struct seq_file *m)
 838 {
 839 #ifdef CONFIG_NUMA_BALANCING
 840         struct mempolicy *pol;
 841
 842         if (p->mm)
 843                 P(mm->numa_scan_seq);
 844
 845         task_lock(p);
 846         pol = p->mempolicy;
 847         if (pol && !(pol->flags & MPOL_F_MORON))
 848                 pol = NULL;
 849         mpol_get(pol);
 850         task_unlock(p);
 851
 852         P(numa_pages_migrated);
 853         P(numa_preferred_nid);
 854         P(total_numa_faults);
 855         SEQ_printf(m, "current_node=%d, numa_group_id=%d\n",
 856                         task_node(p), task_numa_group_id(p));
 857         show_numa_stats(p, m);
 858         mpol_put(pol);
 859 #endif
 860 }
 861
 862 void proc_sched_show_task(struct task_struct *p, struct seq_file *m)
 863 {
 864         unsigned long nr_switches;
 865
 866         SEQ_printf(m, "%s (%d, #threads: %d)\n", p->comm, task_pid_nr(p),
 867                                                 get_nr_threads(p));
 868         SEQ_printf(m,
 869                 "---------------------------------------------------------"
 870                 "----------\n");
 871 #define __P(F) \
 872         SEQ_printf(m, "%-45s:%21Ld\n", #F, (long long)F)
 873 #define P(F) \
 874         SEQ_printf(m, "%-45s:%21Ld\n", #F, (long long)p->F)
 875 #define P_SCHEDSTAT(F) \
 876         SEQ_printf(m, "%-45s:%21Ld\n", #F, (long long)schedstat_val(p->F))
 877 #define __PN(F) \
 878         SEQ_printf(m, "%-45s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)F))
 879 #define PN(F) \
 880         SEQ_printf(m, "%-45s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)p->F))
 881 #define PN_SCHEDSTAT(F) \
 882         SEQ_printf(m, "%-45s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)schedstat_val(p->F)))
 883
 884         PN(se.exec_start);
 885         PN(se.vruntime);
 886         PN(se.sum_exec_runtime);
 887
 888         nr_switches = p->nvcsw + p->nivcsw;
 889
 890         P(se.nr_migrations);
 891
 892         if (schedstat_enabled()) {
 893                 u64 avg_atom, avg_per_cpu;
 894
 895                 PN_SCHEDSTAT(se.statistics.sum_sleep_runtime);
 896                 PN_SCHEDSTAT(se.statistics.wait_start);
 897                 PN_SCHEDSTAT(se.statistics.sleep_start);
 898                 PN_SCHEDSTAT(se.statistics.block_start);
 899                 PN_SCHEDSTAT(se.statistics.sleep_max);
 900                 PN_SCHEDSTAT(se.statistics.block_max);
 901                 PN_SCHEDSTAT(se.statistics.exec_max);
 902                 PN_SCHEDSTAT(se.statistics.slice_max);
 903                 PN_SCHEDSTAT(se.statistics.wait_max);
 904                 PN_SCHEDSTAT(se.statistics.wait_sum);
 905                 P_SCHEDSTAT(se.statistics.wait_count);
 906                 PN_SCHEDSTAT(se.statistics.iowait_sum);
 907                 P_SCHEDSTAT(se.statistics.iowait_count);
 908                 P_SCHEDSTAT(se.statistics.nr_migrations_cold);
 909                 P_SCHEDSTAT(se.statistics.nr_failed_migrations_affine);
 910                 P_SCHEDSTAT(se.statistics.nr_failed_migrations_running);
 911                 P_SCHEDSTAT(se.statistics.nr_failed_migrations_hot);
 912                 P_SCHEDSTAT(se.statistics.nr_forced_migrations);
 913                 P_SCHEDSTAT(se.statistics.nr_wakeups);
 914                 P_SCHEDSTAT(se.statistics.nr_wakeups_sync);
 915                 P_SCHEDSTAT(se.statistics.nr_wakeups_migrate);
 916                 P_SCHEDSTAT(se.statistics.nr_wakeups_local);
 917                 P_SCHEDSTAT(se.statistics.nr_wakeups_remote);
 918                 P_SCHEDSTAT(se.statistics.nr_wakeups_affine);
 919                 P_SCHEDSTAT(se.statistics.nr_wakeups_affine_attempts);
 920                 P_SCHEDSTAT(se.statistics.nr_wakeups_passive);
 921                 P_SCHEDSTAT(se.statistics.nr_wakeups_idle);
 922
 923                 avg_atom = p->se.sum_exec_runtime;
 924                 if (nr_switches)
 925                         avg_atom = div64_ul(avg_atom, nr_switches);
 926                 else
 927                         avg_atom = -1LL;
 928
 929                 avg_per_cpu = p->se.sum_exec_runtime;
 930                 if (p->se.nr_migrations) {
 931                         avg_per_cpu = div64_u64(avg_per_cpu,
 932                                                 p->se.nr_migrations);
 933                 } else {
 934                         avg_per_cpu = -1LL;
 935                 }
 936
 937                 __PN(avg_atom);
 938                 __PN(avg_per_cpu);
 939         }
 940
 941         __P(nr_switches);
 942         SEQ_printf(m, "%-45s:%21Ld\n",
 943                    "nr_voluntary_switches", (long long)p->nvcsw);
 944         SEQ_printf(m, "%-45s:%21Ld\n",
 945                    "nr_involuntary_switches", (long long)p->nivcsw);
 946
 947         P(se.load.weight);
 948 #ifdef CONFIG_SMP
 949         P(se.avg.load_sum);
 950         P(se.avg.util_sum);
 951         P(se.avg.load_avg);
 952         P(se.avg.util_avg);
 953         P(se.avg.last_update_time);
 954 #endif
 955         P(policy);
 956         P(prio);
 957         if (p->policy == SCHED_DEADLINE) {
 958                 P(dl.runtime);
 959                 P(dl.deadline);
 960         }
 961 #undef PN_SCHEDSTAT
 962 #undef PN
 963 #undef __PN
 964 #undef P_SCHEDSTAT
 965 #undef P
 966 #undef __P
 967
 968         {
 969                 unsigned int this_cpu = raw_smp_processor_id();
 970                 u64 t0, t1;
 971
 972                 t0 = cpu_clock(this_cpu);
 973                 t1 = cpu_clock(this_cpu);
 974                 SEQ_printf(m, "%-45s:%21Ld\n",
 975                            "clock-delta", (long long)(t1-t0));
 976         }
 977
 978         sched_show_numa(p, m);
 979 }
 980
 981 void proc_sched_set_task(struct task_struct *p)
 982 {
 983 #ifdef CONFIG_SCHEDSTATS
 984         memset(&p->se.statistics, 0, sizeof(p->se.statistics));
 985 #endif
 986 }