kernel/sched/debug.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * kernel/sched/debug.c
   4  *
   5  * Print the CFS rbtree and other debugging details
   6  *
   7  * Copyright(C) 2007, Red Hat, Inc., Ingo Molnar
   8  */
   9
  10 /*
  11  * This allows printing both to /sys/kernel/debug/sched/debug and
  12  * to the console
  13  */
  14 #define SEQ_printf(m, x...)                     \
  15  do {                                           \
  16         if (m)                                  \
  17                 seq_printf(m, x);               \
  18         else                                    \
  19                 pr_cont(x);                     \
  20  } while (0)
  21
  22 /*
  23  * Ease the printing of nsec fields:
  24  */
  25 static long long nsec_high(unsigned long long nsec)
  26 {
  27         if ((long long)nsec < 0) {
  28                 nsec = -nsec;
  29                 do_div(nsec, 1000000);
  30                 return -nsec;
  31         }
  32         do_div(nsec, 1000000);
  33
  34         return nsec;
  35 }
  36
  37 static unsigned long nsec_low(unsigned long long nsec)
  38 {
  39         if ((long long)nsec < 0)
  40                 nsec = -nsec;
  41
  42         return do_div(nsec, 1000000);
  43 }
  44
  45 #define SPLIT_NS(x) nsec_high(x), nsec_low(x)
  46
  47 #define SCHED_FEAT(name, enabled)       \
  48         #name ,
  49
  50 static const char * const sched_feat_names[] = {
  51 #include "features.h"
  52 };
  53
  54 #undef SCHED_FEAT
  55
  56 static int sched_feat_show(struct seq_file *m, void *v)
  57 {
  58         int i;
  59
  60         for (i = 0; i < __SCHED_FEAT_NR; i++) {
  61                 if (!(sysctl_sched_features & (1UL << i)))
  62                         seq_puts(m, "NO_");
  63                 seq_printf(m, "%s ", sched_feat_names[i]);
  64         }
  65         seq_puts(m, "\n");
  66
  67         return 0;
  68 }
  69
  70 #ifdef CONFIG_JUMP_LABEL
  71
  72 #define jump_label_key__true  STATIC_KEY_INIT_TRUE
  73 #define jump_label_key__false STATIC_KEY_INIT_FALSE
  74
  75 #define SCHED_FEAT(name, enabled)       \
  76         jump_label_key__##enabled ,
  77
  78 struct static_key sched_feat_keys[__SCHED_FEAT_NR] = {
  79 #include "features.h"
  80 };
  81
  82 #undef SCHED_FEAT
  83
  84 static void sched_feat_disable(int i)
  85 {
  86         static_key_disable_cpuslocked(&sched_feat_keys[i]);
  87 }
  88
  89 static void sched_feat_enable(int i)
  90 {
  91         static_key_enable_cpuslocked(&sched_feat_keys[i]);
  92 }
  93 #else
  94 static void sched_feat_disable(int i) { };
  95 static void sched_feat_enable(int i) { };
  96 #endif /* CONFIG_JUMP_LABEL */
  97
  98 static int sched_feat_set(char *cmp)
  99 {
 100         int i;
 101         int neg = 0;
 102
 103         if (strncmp(cmp, "NO_", 3) == 0) {
 104                 neg = 1;
 105                 cmp += 3;
 106         }
 107
 108         i = match_string(sched_feat_names, __SCHED_FEAT_NR, cmp);
 109         if (i < 0)
 110                 return i;
 111
 112         if (neg) {
 113                 sysctl_sched_features &= ~(1UL << i);
 114                 sched_feat_disable(i);
 115         } else {
 116                 sysctl_sched_features |= (1UL << i);
 117                 sched_feat_enable(i);
 118         }
 119
 120         return 0;
 121 }
 122
 123 static ssize_t
 124 sched_feat_write(struct file *filp, const char __user *ubuf,
 125                 size_t cnt, loff_t *ppos)
 126 {
 127         char buf[64];
 128         char *cmp;
 129         int ret;
 130         struct inode *inode;
 131
 132         if (cnt > 63)
 133                 cnt = 63;
 134
 135         if (copy_from_user(&buf, ubuf, cnt))
 136                 return -EFAULT;
 137
 138         buf[cnt] = 0;
 139         cmp = strstrip(buf);
 140
 141         /* Ensure the static_key remains in a consistent state */
 142         inode = file_inode(filp);
 143         cpus_read_lock();
 144         inode_lock(inode);
 145         ret = sched_feat_set(cmp);
 146         inode_unlock(inode);
 147         cpus_read_unlock();
 148         if (ret < 0)
 149                 return ret;
 150
 151         *ppos += cnt;
 152
 153         return cnt;
 154 }
 155
 156 static int sched_feat_open(struct inode *inode, struct file *filp)
 157 {
 158         return single_open(filp, sched_feat_show, NULL);
 159 }
 160
 161 static const struct file_operations sched_feat_fops = {
 162         .open           = sched_feat_open,
 163         .write          = sched_feat_write,
 164         .read           = seq_read,
 165         .llseek         = seq_lseek,
 166         .release        = single_release,
 167 };
 168
 169 #ifdef CONFIG_SMP
 170
 171 static ssize_t sched_scaling_write(struct file *filp, const char __user *ubuf,
 172                                    size_t cnt, loff_t *ppos)
 173 {
 174         char buf[16];
 175         unsigned int scaling;
 176
 177         if (cnt > 15)
 178                 cnt = 15;
 179
 180         if (copy_from_user(&buf, ubuf, cnt))
 181                 return -EFAULT;
 182         buf[cnt] = '\0';
 183
 184         if (kstrtouint(buf, 10, &scaling))
 185                 return -EINVAL;
 186
 187         if (scaling >= SCHED_TUNABLESCALING_END)
 188                 return -EINVAL;
 189
 190         sysctl_sched_tunable_scaling = scaling;
 191         if (sched_update_scaling())
 192                 return -EINVAL;
 193
 194         *ppos += cnt;
 195         return cnt;
 196 }
 197
 198 static int sched_scaling_show(struct seq_file *m, void *v)
 199 {
 200         seq_printf(m, "%d\n", sysctl_sched_tunable_scaling);
 201         return 0;
 202 }
 203
 204 static int sched_scaling_open(struct inode *inode, struct file *filp)
 205 {
 206         return single_open(filp, sched_scaling_show, NULL);
 207 }
 208
 209 static const struct file_operations sched_scaling_fops = {
 210         .open           = sched_scaling_open,
 211         .write          = sched_scaling_write,
 212         .read           = seq_read,
 213         .llseek         = seq_lseek,
 214         .release        = single_release,
 215 };
 216
 217 #endif /* SMP */
 218
 219 #ifdef CONFIG_PREEMPT_DYNAMIC
 220
 221 static ssize_t sched_dynamic_write(struct file *filp, const char __user *ubuf,
 222                                    size_t cnt, loff_t *ppos)
 223 {
 224         char buf[16];
 225         int mode;
 226
 227         if (cnt > 15)
 228                 cnt = 15;
 229
 230         if (copy_from_user(&buf, ubuf, cnt))
 231                 return -EFAULT;
 232
 233         buf[cnt] = 0;
 234         mode = sched_dynamic_mode(strstrip(buf));
 235         if (mode < 0)
 236                 return mode;
 237
 238         sched_dynamic_update(mode);
 239
 240         *ppos += cnt;
 241
 242         return cnt;
 243 }
 244
 245 static int sched_dynamic_show(struct seq_file *m, void *v)
 246 {
 247         static const char * preempt_modes[] = {
 248                 "none", "voluntary", "full", "lazy",
 249         };
 250         int j = ARRAY_SIZE(preempt_modes) - !IS_ENABLED(CONFIG_ARCH_HAS_PREEMPT_LAZY);
 251         int i = IS_ENABLED(CONFIG_PREEMPT_RT) * 2;
 252
 253         for (; i < j; i++) {
 254                 if (preempt_dynamic_mode == i)
 255                         seq_puts(m, "(");
 256                 seq_puts(m, preempt_modes[i]);
 257                 if (preempt_dynamic_mode == i)
 258                         seq_puts(m, ")");
 259
 260                 seq_puts(m, " ");
 261         }
 262
 263         seq_puts(m, "\n");
 264         return 0;
 265 }
 266
 267 static int sched_dynamic_open(struct inode *inode, struct file *filp)
 268 {
 269         return single_open(filp, sched_dynamic_show, NULL);
 270 }
 271
 272 static const struct file_operations sched_dynamic_fops = {
 273         .open           = sched_dynamic_open,
 274         .write          = sched_dynamic_write,
 275         .read           = seq_read,
 276         .llseek         = seq_lseek,
 277         .release        = single_release,
 278 };
 279
 280 #endif /* CONFIG_PREEMPT_DYNAMIC */
 281
 282 __read_mostly bool sched_debug_verbose;
 283
 284 #ifdef CONFIG_SMP
 285 static struct dentry           *sd_dentry;
 286
 287
 288 static ssize_t sched_verbose_write(struct file *filp, const char __user *ubuf,
 289                                   size_t cnt, loff_t *ppos)
 290 {
 291         ssize_t result;
 292         bool orig;
 293
 294         cpus_read_lock();
 295         mutex_lock(&sched_domains_mutex);
 296
 297         orig = sched_debug_verbose;
 298         result = debugfs_write_file_bool(filp, ubuf, cnt, ppos);
 299
 300         if (sched_debug_verbose && !orig)
 301                 update_sched_domain_debugfs();
 302         else if (!sched_debug_verbose && orig) {
 303                 debugfs_remove(sd_dentry);
 304                 sd_dentry = NULL;
 305         }
 306
 307         mutex_unlock(&sched_domains_mutex);
 308         cpus_read_unlock();
 309
 310         return result;
 311 }
 312 #else
 313 #define sched_verbose_write debugfs_write_file_bool
 314 #endif
 315
 316 static const struct file_operations sched_verbose_fops = {
 317         .read =         debugfs_read_file_bool,
 318         .write =        sched_verbose_write,
 319         .open =         simple_open,
 320         .llseek =       default_llseek,
 321 };
 322
 323 static const struct seq_operations sched_debug_sops;
 324
 325 static int sched_debug_open(struct inode *inode, struct file *filp)
 326 {
 327         return seq_open(filp, &sched_debug_sops);
 328 }
 329
 330 static const struct file_operations sched_debug_fops = {
 331         .open           = sched_debug_open,
 332         .read           = seq_read,
 333         .llseek         = seq_lseek,
 334         .release        = seq_release,
 335 };
 336
 337 enum dl_param {
 338         DL_RUNTIME = 0,
 339         DL_PERIOD,
 340 };
 341
 342 static unsigned long fair_server_period_max = (1UL << 22) * NSEC_PER_USEC; /* ~4 seconds */
 343 static unsigned long fair_server_period_min = (100) * NSEC_PER_USEC;     /* 100 us */
 344
 345 static ssize_t sched_fair_server_write(struct file *filp, const char __user *ubuf,
 346                                        size_t cnt, loff_t *ppos, enum dl_param param)
 347 {
 348         long cpu = (long) ((struct seq_file *) filp->private_data)->private;
 349         struct rq *rq = cpu_rq(cpu);
 350         u64 runtime, period;
 351         size_t err;
 352         int retval;
 353         u64 value;
 354
 355         err = kstrtoull_from_user(ubuf, cnt, 10, &value);
 356         if (err)
 357                 return err;
 358
 359         scoped_guard (rq_lock_irqsave, rq) {
 360                 runtime  = rq->fair_server.dl_runtime;
 361                 period = rq->fair_server.dl_period;
 362
 363                 switch (param) {
 364                 case DL_RUNTIME:
 365                         if (runtime == value)
 366                                 break;
 367                         runtime = value;
 368                         break;
 369                 case DL_PERIOD:
 370                         if (value == period)
 371                                 break;
 372                         period = value;
 373                         break;
 374                 }
 375
 376                 if (runtime > period ||
 377                     period > fair_server_period_max ||
 378                     period < fair_server_period_min) {
 379                         return  -EINVAL;
 380                 }
 381
 382                 if (rq->cfs.h_nr_running) {
 383                         update_rq_clock(rq);
 384                         dl_server_stop(&rq->fair_server);
 385                 }
 386
 387                 retval = dl_server_apply_params(&rq->fair_server, runtime, period, 0);
 388                 if (retval)
 389                         cnt = retval;
 390
 391                 if (!runtime)
 392                         printk_deferred("Fair server disabled in CPU %d, system may crash due to starvation.\n",
 393                                         cpu_of(rq));
 394
 395                 if (rq->cfs.h_nr_running)
 396                         dl_server_start(&rq->fair_server);
 397         }
 398
 399         *ppos += cnt;
 400         return cnt;
 401 }
 402
 403 static size_t sched_fair_server_show(struct seq_file *m, void *v, enum dl_param param)
 404 {
 405         unsigned long cpu = (unsigned long) m->private;
 406         struct rq *rq = cpu_rq(cpu);
 407         u64 value;
 408
 409         switch (param) {
 410         case DL_RUNTIME:
 411                 value = rq->fair_server.dl_runtime;
 412                 break;
 413         case DL_PERIOD:
 414                 value = rq->fair_server.dl_period;
 415                 break;
 416         }
 417
 418         seq_printf(m, "%llu\n", value);
 419         return 0;
 420
 421 }
 422
 423 static ssize_t
 424 sched_fair_server_runtime_write(struct file *filp, const char __user *ubuf,
 425                                 size_t cnt, loff_t *ppos)
 426 {
 427         return sched_fair_server_write(filp, ubuf, cnt, ppos, DL_RUNTIME);
 428 }
 429
 430 static int sched_fair_server_runtime_show(struct seq_file *m, void *v)
 431 {
 432         return sched_fair_server_show(m, v, DL_RUNTIME);
 433 }
 434
 435 static int sched_fair_server_runtime_open(struct inode *inode, struct file *filp)
 436 {
 437         return single_open(filp, sched_fair_server_runtime_show, inode->i_private);
 438 }
 439
 440 static const struct file_operations fair_server_runtime_fops = {
 441         .open           = sched_fair_server_runtime_open,
 442         .write          = sched_fair_server_runtime_write,
 443         .read           = seq_read,
 444         .llseek         = seq_lseek,
 445         .release        = single_release,
 446 };
 447
 448 static ssize_t
 449 sched_fair_server_period_write(struct file *filp, const char __user *ubuf,
 450                                size_t cnt, loff_t *ppos)
 451 {
 452         return sched_fair_server_write(filp, ubuf, cnt, ppos, DL_PERIOD);
 453 }
 454
 455 static int sched_fair_server_period_show(struct seq_file *m, void *v)
 456 {
 457         return sched_fair_server_show(m, v, DL_PERIOD);
 458 }
 459
 460 static int sched_fair_server_period_open(struct inode *inode, struct file *filp)
 461 {
 462         return single_open(filp, sched_fair_server_period_show, inode->i_private);
 463 }
 464
 465 static const struct file_operations fair_server_period_fops = {
 466         .open           = sched_fair_server_period_open,
 467         .write          = sched_fair_server_period_write,
 468         .read           = seq_read,
 469         .llseek         = seq_lseek,
 470         .release        = single_release,
 471 };
 472
 473 static struct dentry *debugfs_sched;
 474
 475 static void debugfs_fair_server_init(void)
 476 {
 477         struct dentry *d_fair;
 478         unsigned long cpu;
 479
 480         d_fair = debugfs_create_dir("fair_server", debugfs_sched);
 481         if (!d_fair)
 482                 return;
 483
 484         for_each_possible_cpu(cpu) {
 485                 struct dentry *d_cpu;
 486                 char buf[32];
 487
 488                 snprintf(buf, sizeof(buf), "cpu%lu", cpu);
 489                 d_cpu = debugfs_create_dir(buf, d_fair);
 490
 491                 debugfs_create_file("runtime", 0644, d_cpu, (void *) cpu, &fair_server_runtime_fops);
 492                 debugfs_create_file("period", 0644, d_cpu, (void *) cpu, &fair_server_period_fops);
 493         }
 494 }
 495
 496 static __init int sched_init_debug(void)
 497 {
 498         struct dentry __maybe_unused *numa;
 499
 500         debugfs_sched = debugfs_create_dir("sched", NULL);
 501
 502         debugfs_create_file("features", 0644, debugfs_sched, NULL, &sched_feat_fops);
 503         debugfs_create_file_unsafe("verbose", 0644, debugfs_sched, &sched_debug_verbose, &sched_verbose_fops);
 504 #ifdef CONFIG_PREEMPT_DYNAMIC
 505         debugfs_create_file("preempt", 0644, debugfs_sched, NULL, &sched_dynamic_fops);
 506 #endif
 507
 508         debugfs_create_u32("base_slice_ns", 0644, debugfs_sched, &sysctl_sched_base_slice);
 509
 510         debugfs_create_u32("latency_warn_ms", 0644, debugfs_sched, &sysctl_resched_latency_warn_ms);
 511         debugfs_create_u32("latency_warn_once", 0644, debugfs_sched, &sysctl_resched_latency_warn_once);
 512
 513 #ifdef CONFIG_SMP
 514         debugfs_create_file("tunable_scaling", 0644, debugfs_sched, NULL, &sched_scaling_fops);
 515         debugfs_create_u32("migration_cost_ns", 0644, debugfs_sched, &sysctl_sched_migration_cost);
 516         debugfs_create_u32("nr_migrate", 0644, debugfs_sched, &sysctl_sched_nr_migrate);
 517
 518         mutex_lock(&sched_domains_mutex);
 519         update_sched_domain_debugfs();
 520         mutex_unlock(&sched_domains_mutex);
 521 #endif
 522
 523 #ifdef CONFIG_NUMA_BALANCING
 524         numa = debugfs_create_dir("numa_balancing", debugfs_sched);
 525
 526         debugfs_create_u32("scan_delay_ms", 0644, numa, &sysctl_numa_balancing_scan_delay);
 527         debugfs_create_u32("scan_period_min_ms", 0644, numa, &sysctl_numa_balancing_scan_period_min);
 528         debugfs_create_u32("scan_period_max_ms", 0644, numa, &sysctl_numa_balancing_scan_period_max);
 529         debugfs_create_u32("scan_size_mb", 0644, numa, &sysctl_numa_balancing_scan_size);
 530         debugfs_create_u32("hot_threshold_ms", 0644, numa, &sysctl_numa_balancing_hot_threshold);
 531 #endif
 532
 533         debugfs_create_file("debug", 0444, debugfs_sched, NULL, &sched_debug_fops);
 534
 535         debugfs_fair_server_init();
 536
 537         return 0;
 538 }
 539 late_initcall(sched_init_debug);
 540
 541 #ifdef CONFIG_SMP
 542
 543 static cpumask_var_t            sd_sysctl_cpus;
 544
 545 static int sd_flags_show(struct seq_file *m, void *v)
 546 {
 547         unsigned long flags = *(unsigned int *)m->private;
 548         int idx;
 549
 550         for_each_set_bit(idx, &flags, __SD_FLAG_CNT) {
 551                 seq_puts(m, sd_flag_debug[idx].name);
 552                 seq_puts(m, " ");
 553         }
 554         seq_puts(m, "\n");
 555
 556         return 0;
 557 }
 558
 559 static int sd_flags_open(struct inode *inode, struct file *file)
 560 {
 561         return single_open(file, sd_flags_show, inode->i_private);
 562 }
 563
 564 static const struct file_operations sd_flags_fops = {
 565         .open           = sd_flags_open,
 566         .read           = seq_read,
 567         .llseek         = seq_lseek,
 568         .release        = single_release,
 569 };
 570
 571 static void register_sd(struct sched_domain *sd, struct dentry *parent)
 572 {
 573 #define SDM(type, mode, member) \
 574         debugfs_create_##type(#member, mode, parent, &sd->member)
 575
 576         SDM(ulong, 0644, min_interval);
 577         SDM(ulong, 0644, max_interval);
 578         SDM(u64,   0644, max_newidle_lb_cost);
 579         SDM(u32,   0644, busy_factor);
 580         SDM(u32,   0644, imbalance_pct);
 581         SDM(u32,   0644, cache_nice_tries);
 582         SDM(str,   0444, name);
 583
 584 #undef SDM
 585
 586         debugfs_create_file("flags", 0444, parent, &sd->flags, &sd_flags_fops);
 587         debugfs_create_file("groups_flags", 0444, parent, &sd->groups->flags, &sd_flags_fops);
 588         debugfs_create_u32("level", 0444, parent, (u32 *)&sd->level);
 589 }
 590
 591 void update_sched_domain_debugfs(void)
 592 {
 593         int cpu, i;
 594
 595         /*
 596          * This can unfortunately be invoked before sched_debug_init() creates
 597          * the debug directory. Don't touch sd_sysctl_cpus until then.
 598          */
 599         if (!debugfs_sched)
 600                 return;
 601
 602         if (!sched_debug_verbose)
 603                 return;
 604
 605         if (!cpumask_available(sd_sysctl_cpus)) {
 606                 if (!alloc_cpumask_var(&sd_sysctl_cpus, GFP_KERNEL))
 607                         return;
 608                 cpumask_copy(sd_sysctl_cpus, cpu_possible_mask);
 609         }
 610
 611         if (!sd_dentry) {
 612                 sd_dentry = debugfs_create_dir("domains", debugfs_sched);
 613
 614                 /* rebuild sd_sysctl_cpus if empty since it gets cleared below */
 615                 if (cpumask_empty(sd_sysctl_cpus))
 616                         cpumask_copy(sd_sysctl_cpus, cpu_online_mask);
 617         }
 618
 619         for_each_cpu(cpu, sd_sysctl_cpus) {
 620                 struct sched_domain *sd;
 621                 struct dentry *d_cpu;
 622                 char buf[32];
 623
 624                 snprintf(buf, sizeof(buf), "cpu%d", cpu);
 625                 debugfs_lookup_and_remove(buf, sd_dentry);
 626                 d_cpu = debugfs_create_dir(buf, sd_dentry);
 627
 628                 i = 0;
 629                 for_each_domain(cpu, sd) {
 630                         struct dentry *d_sd;
 631
 632                         snprintf(buf, sizeof(buf), "domain%d", i);
 633                         d_sd = debugfs_create_dir(buf, d_cpu);
 634
 635                         register_sd(sd, d_sd);
 636                         i++;
 637                 }
 638
 639                 __cpumask_clear_cpu(cpu, sd_sysctl_cpus);
 640         }
 641 }
 642
 643 void dirty_sched_domain_sysctl(int cpu)
 644 {
 645         if (cpumask_available(sd_sysctl_cpus))
 646                 __cpumask_set_cpu(cpu, sd_sysctl_cpus);
 647 }
 648
 649 #endif /* CONFIG_SMP */
 650
 651 #ifdef CONFIG_FAIR_GROUP_SCHED
 652 static void print_cfs_group_stats(struct seq_file *m, int cpu, struct task_group *tg)
 653 {
 654         struct sched_entity *se = tg->se[cpu];
 655
 656 #define P(F)            SEQ_printf(m, "  .%-30s: %lld\n",       #F, (long long)F)
 657 #define P_SCHEDSTAT(F)  SEQ_printf(m, "  .%-30s: %lld\n",       \
 658                 #F, (long long)schedstat_val(stats->F))
 659 #define PN(F)           SEQ_printf(m, "  .%-30s: %lld.%06ld\n", #F, SPLIT_NS((long long)F))
 660 #define PN_SCHEDSTAT(F) SEQ_printf(m, "  .%-30s: %lld.%06ld\n", \
 661                 #F, SPLIT_NS((long long)schedstat_val(stats->F)))
 662
 663         if (!se)
 664                 return;
 665
 666         PN(se->exec_start);
 667         PN(se->vruntime);
 668         PN(se->sum_exec_runtime);
 669
 670         if (schedstat_enabled()) {
 671                 struct sched_statistics *stats;
 672                 stats = __schedstats_from_se(se);
 673
 674                 PN_SCHEDSTAT(wait_start);
 675                 PN_SCHEDSTAT(sleep_start);
 676                 PN_SCHEDSTAT(block_start);
 677                 PN_SCHEDSTAT(sleep_max);
 678                 PN_SCHEDSTAT(block_max);
 679                 PN_SCHEDSTAT(exec_max);
 680                 PN_SCHEDSTAT(slice_max);
 681                 PN_SCHEDSTAT(wait_max);
 682                 PN_SCHEDSTAT(wait_sum);
 683                 P_SCHEDSTAT(wait_count);
 684         }
 685
 686         P(se->load.weight);
 687 #ifdef CONFIG_SMP
 688         P(se->avg.load_avg);
 689         P(se->avg.util_avg);
 690         P(se->avg.runnable_avg);
 691 #endif
 692
 693 #undef PN_SCHEDSTAT
 694 #undef PN
 695 #undef P_SCHEDSTAT
 696 #undef P
 697 }
 698 #endif
 699
 700 #ifdef CONFIG_CGROUP_SCHED
 701 static DEFINE_SPINLOCK(sched_debug_lock);
 702 static char group_path[PATH_MAX];
 703
 704 static void task_group_path(struct task_group *tg, char *path, int plen)
 705 {
 706         if (autogroup_path(tg, path, plen))
 707                 return;
 708
 709         cgroup_path(tg->css.cgroup, path, plen);
 710 }
 711
 712 /*
 713  * Only 1 SEQ_printf_task_group_path() caller can use the full length
 714  * group_path[] for cgroup path. Other simultaneous callers will have
 715  * to use a shorter stack buffer. A "..." suffix is appended at the end
 716  * of the stack buffer so that it will show up in case the output length
 717  * matches the given buffer size to indicate possible path name truncation.
 718  */
 719 #define SEQ_printf_task_group_path(m, tg, fmt...)                       \
 720 {                                                                       \
 721         if (spin_trylock(&sched_debug_lock)) {                          \
 722                 task_group_path(tg, group_path, sizeof(group_path));    \
 723                 SEQ_printf(m, fmt, group_path);                         \
 724                 spin_unlock(&sched_debug_lock);                         \
 725         } else {                                                        \
 726                 char buf[128];                                          \
 727                 char *bufend = buf + sizeof(buf) - 3;                   \
 728                 task_group_path(tg, buf, bufend - buf);                 \
 729                 strcpy(bufend - 1, "...");                              \
 730                 SEQ_printf(m, fmt, buf);                                \
 731         }                                                               \
 732 }
 733 #endif
 734
 735 static void
 736 print_task(struct seq_file *m, struct rq *rq, struct task_struct *p)
 737 {
 738         if (task_current(rq, p))
 739                 SEQ_printf(m, ">R");
 740         else
 741                 SEQ_printf(m, " %c", task_state_to_char(p));
 742
 743         SEQ_printf(m, " %15s %5d %9Ld.%06ld   %c   %9Ld.%06ld %c %9Ld.%06ld %9Ld.%06ld %9Ld   %5d ",
 744                 p->comm, task_pid_nr(p),
 745                 SPLIT_NS(p->se.vruntime),
 746                 entity_eligible(cfs_rq_of(&p->se), &p->se) ? 'E' : 'N',
 747                 SPLIT_NS(p->se.deadline),
 748                 p->se.custom_slice ? 'S' : ' ',
 749                 SPLIT_NS(p->se.slice),
 750                 SPLIT_NS(p->se.sum_exec_runtime),
 751                 (long long)(p->nvcsw + p->nivcsw),
 752                 p->prio);
 753
 754         SEQ_printf(m, "%9lld.%06ld %9lld.%06ld %9lld.%06ld",
 755                 SPLIT_NS(schedstat_val_or_zero(p->stats.wait_sum)),
 756                 SPLIT_NS(schedstat_val_or_zero(p->stats.sum_sleep_runtime)),
 757                 SPLIT_NS(schedstat_val_or_zero(p->stats.sum_block_runtime)));
 758
 759 #ifdef CONFIG_NUMA_BALANCING
 760         SEQ_printf(m, "   %d      %d", task_node(p), task_numa_group_id(p));
 761 #endif
 762 #ifdef CONFIG_CGROUP_SCHED
 763         SEQ_printf_task_group_path(m, task_group(p), "        %s")
 764 #endif
 765
 766         SEQ_printf(m, "\n");
 767 }
 768
 769 static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu)
 770 {
 771         struct task_struct *g, *p;
 772
 773         SEQ_printf(m, "\n");
 774         SEQ_printf(m, "runnable tasks:\n");
 775         SEQ_printf(m, " S            task   PID       vruntime   eligible    "
 776                    "deadline             slice          sum-exec      switches  "
 777                    "prio         wait-time        sum-sleep       sum-block"
 778 #ifdef CONFIG_NUMA_BALANCING
 779                    "  node   group-id"
 780 #endif
 781 #ifdef CONFIG_CGROUP_SCHED
 782                    "  group-path"
 783 #endif
 784                    "\n");
 785         SEQ_printf(m, "-------------------------------------------------------"
 786                    "------------------------------------------------------"
 787                    "------------------------------------------------------"
 788 #ifdef CONFIG_NUMA_BALANCING
 789                    "--------------"
 790 #endif
 791 #ifdef CONFIG_CGROUP_SCHED
 792                    "--------------"
 793 #endif
 794                    "\n");
 795
 796         rcu_read_lock();
 797         for_each_process_thread(g, p) {
 798                 if (task_cpu(p) != rq_cpu)
 799                         continue;
 800
 801                 print_task(m, rq, p);
 802         }
 803         rcu_read_unlock();
 804 }
 805
 806 void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
 807 {
 808         s64 left_vruntime = -1, min_vruntime, right_vruntime = -1, left_deadline = -1, spread;
 809         struct sched_entity *last, *first, *root;
 810         struct rq *rq = cpu_rq(cpu);
 811         unsigned long flags;
 812
 813 #ifdef CONFIG_FAIR_GROUP_SCHED
 814         SEQ_printf(m, "\n");
 815         SEQ_printf_task_group_path(m, cfs_rq->tg, "cfs_rq[%d]:%s\n", cpu);
 816 #else
 817         SEQ_printf(m, "\n");
 818         SEQ_printf(m, "cfs_rq[%d]:\n", cpu);
 819 #endif
 820
 821         raw_spin_rq_lock_irqsave(rq, flags);
 822         root = __pick_root_entity(cfs_rq);
 823         if (root)
 824                 left_vruntime = root->min_vruntime;
 825         first = __pick_first_entity(cfs_rq);
 826         if (first)
 827                 left_deadline = first->deadline;
 828         last = __pick_last_entity(cfs_rq);
 829         if (last)
 830                 right_vruntime = last->vruntime;
 831         min_vruntime = cfs_rq->min_vruntime;
 832         raw_spin_rq_unlock_irqrestore(rq, flags);
 833
 834         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", "left_deadline",
 835                         SPLIT_NS(left_deadline));
 836         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", "left_vruntime",
 837                         SPLIT_NS(left_vruntime));
 838         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", "min_vruntime",
 839                         SPLIT_NS(min_vruntime));
 840         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", "avg_vruntime",
 841                         SPLIT_NS(avg_vruntime(cfs_rq)));
 842         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", "right_vruntime",
 843                         SPLIT_NS(right_vruntime));
 844         spread = right_vruntime - left_vruntime;
 845         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", "spread", SPLIT_NS(spread));
 846         SEQ_printf(m, "  .%-30s: %d\n", "nr_running", cfs_rq->nr_running);
 847         SEQ_printf(m, "  .%-30s: %d\n", "h_nr_running", cfs_rq->h_nr_running);
 848         SEQ_printf(m, "  .%-30s: %d\n", "h_nr_delayed", cfs_rq->h_nr_delayed);
 849         SEQ_printf(m, "  .%-30s: %d\n", "idle_nr_running",
 850                         cfs_rq->idle_nr_running);
 851         SEQ_printf(m, "  .%-30s: %d\n", "idle_h_nr_running",
 852                         cfs_rq->idle_h_nr_running);
 853         SEQ_printf(m, "  .%-30s: %ld\n", "load", cfs_rq->load.weight);
 854 #ifdef CONFIG_SMP
 855         SEQ_printf(m, "  .%-30s: %lu\n", "load_avg",
 856                         cfs_rq->avg.load_avg);
 857         SEQ_printf(m, "  .%-30s: %lu\n", "runnable_avg",
 858                         cfs_rq->avg.runnable_avg);
 859         SEQ_printf(m, "  .%-30s: %lu\n", "util_avg",
 860                         cfs_rq->avg.util_avg);
 861         SEQ_printf(m, "  .%-30s: %u\n", "util_est",
 862                         cfs_rq->avg.util_est);
 863         SEQ_printf(m, "  .%-30s: %ld\n", "removed.load_avg",
 864                         cfs_rq->removed.load_avg);
 865         SEQ_printf(m, "  .%-30s: %ld\n", "removed.util_avg",
 866                         cfs_rq->removed.util_avg);
 867         SEQ_printf(m, "  .%-30s: %ld\n", "removed.runnable_avg",
 868                         cfs_rq->removed.runnable_avg);
 869 #ifdef CONFIG_FAIR_GROUP_SCHED
 870         SEQ_printf(m, "  .%-30s: %lu\n", "tg_load_avg_contrib",
 871                         cfs_rq->tg_load_avg_contrib);
 872         SEQ_printf(m, "  .%-30s: %ld\n", "tg_load_avg",
 873                         atomic_long_read(&cfs_rq->tg->load_avg));
 874 #endif
 875 #endif
 876 #ifdef CONFIG_CFS_BANDWIDTH
 877         SEQ_printf(m, "  .%-30s: %d\n", "throttled",
 878                         cfs_rq->throttled);
 879         SEQ_printf(m, "  .%-30s: %d\n", "throttle_count",
 880                         cfs_rq->throttle_count);
 881 #endif
 882
 883 #ifdef CONFIG_FAIR_GROUP_SCHED
 884         print_cfs_group_stats(m, cpu, cfs_rq->tg);
 885 #endif
 886 }
 887
 888 void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq)
 889 {
 890 #ifdef CONFIG_RT_GROUP_SCHED
 891         SEQ_printf(m, "\n");
 892         SEQ_printf_task_group_path(m, rt_rq->tg, "rt_rq[%d]:%s\n", cpu);
 893 #else
 894         SEQ_printf(m, "\n");
 895         SEQ_printf(m, "rt_rq[%d]:\n", cpu);
 896 #endif
 897
 898 #define P(x) \
 899         SEQ_printf(m, "  .%-30s: %Ld\n", #x, (long long)(rt_rq->x))
 900 #define PU(x) \
 901         SEQ_printf(m, "  .%-30s: %lu\n", #x, (unsigned long)(rt_rq->x))
 902 #define PN(x) \
 903         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rt_rq->x))
 904
 905         PU(rt_nr_running);
 906
 907 #ifdef CONFIG_RT_GROUP_SCHED
 908         P(rt_throttled);
 909         PN(rt_time);
 910         PN(rt_runtime);
 911 #endif
 912
 913 #undef PN
 914 #undef PU
 915 #undef P
 916 }
 917
 918 void print_dl_rq(struct seq_file *m, int cpu, struct dl_rq *dl_rq)
 919 {
 920         struct dl_bw *dl_bw;
 921
 922         SEQ_printf(m, "\n");
 923         SEQ_printf(m, "dl_rq[%d]:\n", cpu);
 924
 925 #define PU(x) \
 926         SEQ_printf(m, "  .%-30s: %lu\n", #x, (unsigned long)(dl_rq->x))
 927
 928         PU(dl_nr_running);
 929 #ifdef CONFIG_SMP
 930         dl_bw = &cpu_rq(cpu)->rd->dl_bw;
 931 #else
 932         dl_bw = &dl_rq->dl_bw;
 933 #endif
 934         SEQ_printf(m, "  .%-30s: %lld\n", "dl_bw->bw", dl_bw->bw);
 935         SEQ_printf(m, "  .%-30s: %lld\n", "dl_bw->total_bw", dl_bw->total_bw);
 936
 937 #undef PU
 938 }
 939
 940 static void print_cpu(struct seq_file *m, int cpu)
 941 {
 942         struct rq *rq = cpu_rq(cpu);
 943
 944 #ifdef CONFIG_X86
 945         {
 946                 unsigned int freq = cpu_khz ? : 1;
 947
 948                 SEQ_printf(m, "cpu#%d, %u.%03u MHz\n",
 949                            cpu, freq / 1000, (freq % 1000));
 950         }
 951 #else
 952         SEQ_printf(m, "cpu#%d\n", cpu);
 953 #endif
 954
 955 #define P(x)                                                            \
 956 do {                                                                    \
 957         if (sizeof(rq->x) == 4)                                         \
 958                 SEQ_printf(m, "  .%-30s: %d\n", #x, (int)(rq->x));      \
 959         else                                                            \
 960                 SEQ_printf(m, "  .%-30s: %Ld\n", #x, (long long)(rq->x));\
 961 } while (0)
 962
 963 #define PN(x) \
 964         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rq->x))
 965
 966         P(nr_running);
 967         P(nr_switches);
 968         P(nr_uninterruptible);
 969         PN(next_balance);
 970         SEQ_printf(m, "  .%-30s: %ld\n", "curr->pid", (long)(task_pid_nr(rq->curr)));
 971         PN(clock);
 972         PN(clock_task);
 973 #undef P
 974 #undef PN
 975
 976 #ifdef CONFIG_SMP
 977 #define P64(n) SEQ_printf(m, "  .%-30s: %Ld\n", #n, rq->n);
 978         P64(avg_idle);
 979         P64(max_idle_balance_cost);
 980 #undef P64
 981 #endif
 982
 983 #define P(n) SEQ_printf(m, "  .%-30s: %d\n", #n, schedstat_val(rq->n));
 984         if (schedstat_enabled()) {
 985                 P(yld_count);
 986                 P(sched_count);
 987                 P(sched_goidle);
 988                 P(ttwu_count);
 989                 P(ttwu_local);
 990         }
 991 #undef P
 992
 993         print_cfs_stats(m, cpu);
 994         print_rt_stats(m, cpu);
 995         print_dl_stats(m, cpu);
 996
 997         print_rq(m, rq, cpu);
 998         SEQ_printf(m, "\n");
 999 }
1000
1001 static const char *sched_tunable_scaling_names[] = {
1002         "none",
1003         "logarithmic",
1004         "linear"
1005 };
1006
1007 static void sched_debug_header(struct seq_file *m)
1008 {
1009         u64 ktime, sched_clk, cpu_clk;
1010         unsigned long flags;
1011
1012         local_irq_save(flags);
1013         ktime = ktime_to_ns(ktime_get());
1014         sched_clk = sched_clock();
1015         cpu_clk = local_clock();
1016         local_irq_restore(flags);
1017
1018         SEQ_printf(m, "Sched Debug Version: v0.11, %s %.*s\n",
1019                 init_utsname()->release,
1020                 (int)strcspn(init_utsname()->version, " "),
1021                 init_utsname()->version);
1022
1023 #define P(x) \
1024         SEQ_printf(m, "%-40s: %Ld\n", #x, (long long)(x))
1025 #define PN(x) \
1026         SEQ_printf(m, "%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x))
1027         PN(ktime);
1028         PN(sched_clk);
1029         PN(cpu_clk);
1030         P(jiffies);
1031 #ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
1032         P(sched_clock_stable());
1033 #endif
1034 #undef PN
1035 #undef P
1036
1037         SEQ_printf(m, "\n");
1038         SEQ_printf(m, "sysctl_sched\n");
1039
1040 #define P(x) \
1041         SEQ_printf(m, "  .%-40s: %Ld\n", #x, (long long)(x))
1042 #define PN(x) \
1043         SEQ_printf(m, "  .%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x))
1044         PN(sysctl_sched_base_slice);
1045         P(sysctl_sched_features);
1046 #undef PN
1047 #undef P
1048
1049         SEQ_printf(m, "  .%-40s: %d (%s)\n",
1050                 "sysctl_sched_tunable_scaling",
1051                 sysctl_sched_tunable_scaling,
1052                 sched_tunable_scaling_names[sysctl_sched_tunable_scaling]);
1053         SEQ_printf(m, "\n");
1054 }
1055
1056 static int sched_debug_show(struct seq_file *m, void *v)
1057 {
1058         int cpu = (unsigned long)(v - 2);
1059
1060         if (cpu != -1)
1061                 print_cpu(m, cpu);
1062         else
1063                 sched_debug_header(m);
1064
1065         return 0;
1066 }
1067
1068 void sysrq_sched_debug_show(void)
1069 {
1070         int cpu;
1071
1072         sched_debug_header(NULL);
1073         for_each_online_cpu(cpu) {
1074                 /*
1075                  * Need to reset softlockup watchdogs on all CPUs, because
1076                  * another CPU might be blocked waiting for us to process
1077                  * an IPI or stop_machine.
1078                  */
1079                 touch_nmi_watchdog();
1080                 touch_all_softlockup_watchdogs();
1081                 print_cpu(NULL, cpu);
1082         }
1083 }
1084
1085 /*
1086  * This iterator needs some explanation.
1087  * It returns 1 for the header position.
1088  * This means 2 is CPU 0.
1089  * In a hotplugged system some CPUs, including CPU 0, may be missing so we have
1090  * to use cpumask_* to iterate over the CPUs.
1091  */
1092 static void *sched_debug_start(struct seq_file *file, loff_t *offset)
1093 {
1094         unsigned long n = *offset;
1095
1096         if (n == 0)
1097                 return (void *) 1;
1098
1099         n--;
1100
1101         if (n > 0)
1102                 n = cpumask_next(n - 1, cpu_online_mask);
1103         else
1104                 n = cpumask_first(cpu_online_mask);
1105
1106         *offset = n + 1;
1107
1108         if (n < nr_cpu_ids)
1109                 return (void *)(unsigned long)(n + 2);
1110
1111         return NULL;
1112 }
1113
1114 static void *sched_debug_next(struct seq_file *file, void *data, loff_t *offset)
1115 {
1116         (*offset)++;
1117         return sched_debug_start(file, offset);
1118 }
1119
1120 static void sched_debug_stop(struct seq_file *file, void *data)
1121 {
1122 }
1123
1124 static const struct seq_operations sched_debug_sops = {
1125         .start          = sched_debug_start,
1126         .next           = sched_debug_next,
1127         .stop           = sched_debug_stop,
1128         .show           = sched_debug_show,
1129 };
1130
1131 #define __PS(S, F) SEQ_printf(m, "%-45s:%21Ld\n", S, (long long)(F))
1132 #define __P(F) __PS(#F, F)
1133 #define   P(F) __PS(#F, p->F)
1134 #define   PM(F, M) __PS(#F, p->F & (M))
1135 #define __PSN(S, F) SEQ_printf(m, "%-45s:%14Ld.%06ld\n", S, SPLIT_NS((long long)(F)))
1136 #define __PN(F) __PSN(#F, F)
1137 #define   PN(F) __PSN(#F, p->F)
1138
1139
1140 #ifdef CONFIG_NUMA_BALANCING
1141 void print_numa_stats(struct seq_file *m, int node, unsigned long tsf,
1142                 unsigned long tpf, unsigned long gsf, unsigned long gpf)
1143 {
1144         SEQ_printf(m, "numa_faults node=%d ", node);
1145         SEQ_printf(m, "task_private=%lu task_shared=%lu ", tpf, tsf);
1146         SEQ_printf(m, "group_private=%lu group_shared=%lu\n", gpf, gsf);
1147 }
1148 #endif
1149
1150
1151 static void sched_show_numa(struct task_struct *p, struct seq_file *m)
1152 {
1153 #ifdef CONFIG_NUMA_BALANCING
1154         if (p->mm)
1155                 P(mm->numa_scan_seq);
1156
1157         P(numa_pages_migrated);
1158         P(numa_preferred_nid);
1159         P(total_numa_faults);
1160         SEQ_printf(m, "current_node=%d, numa_group_id=%d\n",
1161                         task_node(p), task_numa_group_id(p));
1162         show_numa_stats(p, m);
1163 #endif
1164 }
1165
1166 void proc_sched_show_task(struct task_struct *p, struct pid_namespace *ns,
1167                                                   struct seq_file *m)
1168 {
1169         unsigned long nr_switches;
1170
1171         SEQ_printf(m, "%s (%d, #threads: %d)\n", p->comm, task_pid_nr_ns(p, ns),
1172                                                 get_nr_threads(p));
1173         SEQ_printf(m,
1174                 "---------------------------------------------------------"
1175                 "----------\n");
1176
1177 #define P_SCHEDSTAT(F)  __PS(#F, schedstat_val(p->stats.F))
1178 #define PN_SCHEDSTAT(F) __PSN(#F, schedstat_val(p->stats.F))
1179
1180         PN(se.exec_start);
1181         PN(se.vruntime);
1182         PN(se.sum_exec_runtime);
1183
1184         nr_switches = p->nvcsw + p->nivcsw;
1185
1186         P(se.nr_migrations);
1187
1188         if (schedstat_enabled()) {
1189                 u64 avg_atom, avg_per_cpu;
1190
1191                 PN_SCHEDSTAT(sum_sleep_runtime);
1192                 PN_SCHEDSTAT(sum_block_runtime);
1193                 PN_SCHEDSTAT(wait_start);
1194                 PN_SCHEDSTAT(sleep_start);
1195                 PN_SCHEDSTAT(block_start);
1196                 PN_SCHEDSTAT(sleep_max);
1197                 PN_SCHEDSTAT(block_max);
1198                 PN_SCHEDSTAT(exec_max);
1199                 PN_SCHEDSTAT(slice_max);
1200                 PN_SCHEDSTAT(wait_max);
1201                 PN_SCHEDSTAT(wait_sum);
1202                 P_SCHEDSTAT(wait_count);
1203                 PN_SCHEDSTAT(iowait_sum);
1204                 P_SCHEDSTAT(iowait_count);
1205                 P_SCHEDSTAT(nr_migrations_cold);
1206                 P_SCHEDSTAT(nr_failed_migrations_affine);
1207                 P_SCHEDSTAT(nr_failed_migrations_running);
1208                 P_SCHEDSTAT(nr_failed_migrations_hot);
1209                 P_SCHEDSTAT(nr_forced_migrations);
1210                 P_SCHEDSTAT(nr_wakeups);
1211                 P_SCHEDSTAT(nr_wakeups_sync);
1212                 P_SCHEDSTAT(nr_wakeups_migrate);
1213                 P_SCHEDSTAT(nr_wakeups_local);
1214                 P_SCHEDSTAT(nr_wakeups_remote);
1215                 P_SCHEDSTAT(nr_wakeups_affine);
1216                 P_SCHEDSTAT(nr_wakeups_affine_attempts);
1217                 P_SCHEDSTAT(nr_wakeups_passive);
1218                 P_SCHEDSTAT(nr_wakeups_idle);
1219
1220                 avg_atom = p->se.sum_exec_runtime;
1221                 if (nr_switches)
1222                         avg_atom = div64_ul(avg_atom, nr_switches);
1223                 else
1224                         avg_atom = -1LL;
1225
1226                 avg_per_cpu = p->se.sum_exec_runtime;
1227                 if (p->se.nr_migrations) {
1228                         avg_per_cpu = div64_u64(avg_per_cpu,
1229                                                 p->se.nr_migrations);
1230                 } else {
1231                         avg_per_cpu = -1LL;
1232                 }
1233
1234                 __PN(avg_atom);
1235                 __PN(avg_per_cpu);
1236
1237 #ifdef CONFIG_SCHED_CORE
1238                 PN_SCHEDSTAT(core_forceidle_sum);
1239 #endif
1240         }
1241
1242         __P(nr_switches);
1243         __PS("nr_voluntary_switches", p->nvcsw);
1244         __PS("nr_involuntary_switches", p->nivcsw);
1245
1246         P(se.load.weight);
1247 #ifdef CONFIG_SMP
1248         P(se.avg.load_sum);
1249         P(se.avg.runnable_sum);
1250         P(se.avg.util_sum);
1251         P(se.avg.load_avg);
1252         P(se.avg.runnable_avg);
1253         P(se.avg.util_avg);
1254         P(se.avg.last_update_time);
1255         PM(se.avg.util_est, ~UTIL_AVG_UNCHANGED);
1256 #endif
1257 #ifdef CONFIG_UCLAMP_TASK
1258         __PS("uclamp.min", p->uclamp_req[UCLAMP_MIN].value);
1259         __PS("uclamp.max", p->uclamp_req[UCLAMP_MAX].value);
1260         __PS("effective uclamp.min", uclamp_eff_value(p, UCLAMP_MIN));
1261         __PS("effective uclamp.max", uclamp_eff_value(p, UCLAMP_MAX));
1262 #endif
1263         P(policy);
1264         P(prio);
1265         if (task_has_dl_policy(p)) {
1266                 P(dl.runtime);
1267                 P(dl.deadline);
1268         }
1269 #ifdef CONFIG_SCHED_CLASS_EXT
1270         __PS("ext.enabled", task_on_scx(p));
1271 #endif
1272 #undef PN_SCHEDSTAT
1273 #undef P_SCHEDSTAT
1274
1275         {
1276                 unsigned int this_cpu = raw_smp_processor_id();
1277                 u64 t0, t1;
1278
1279                 t0 = cpu_clock(this_cpu);
1280                 t1 = cpu_clock(this_cpu);
1281                 __PS("clock-delta", t1-t0);
1282         }
1283
1284         sched_show_numa(p, m);
1285 }
1286
1287 void proc_sched_set_task(struct task_struct *p)
1288 {
1289 #ifdef CONFIG_SCHEDSTATS
1290         memset(&p->stats, 0, sizeof(p->stats));
1291 #endif
1292 }
1293
1294 void resched_latency_warn(int cpu, u64 latency)
1295 {
1296         static DEFINE_RATELIMIT_STATE(latency_check_ratelimit, 60 * 60 * HZ, 1);
1297
1298         WARN(__ratelimit(&latency_check_ratelimit),
1299              "sched: CPU %d need_resched set for > %llu ns (%d ticks) "
1300              "without schedule\n",
1301              cpu, latency, cpu_rq(cpu)->ticks_without_resched);
1302 }