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         int i = IS_ENABLED(CONFIG_PREEMPT_RT) * 2;
 248         int j;
 249
 250         /* Count entries in NULL terminated preempt_modes */
 251         for (j = 0; preempt_modes[j]; j++)
 252                 ;
 253         j -= !IS_ENABLED(CONFIG_ARCH_HAS_PREEMPT_LAZY);
 254
 255         for (; i < j; i++) {
 256                 if (preempt_dynamic_mode == i)
 257                         seq_puts(m, "(");
 258                 seq_puts(m, preempt_modes[i]);
 259                 if (preempt_dynamic_mode == i)
 260                         seq_puts(m, ")");
 261
 262                 seq_puts(m, " ");
 263         }
 264
 265         seq_puts(m, "\n");
 266         return 0;
 267 }
 268
 269 static int sched_dynamic_open(struct inode *inode, struct file *filp)
 270 {
 271         return single_open(filp, sched_dynamic_show, NULL);
 272 }
 273
 274 static const struct file_operations sched_dynamic_fops = {
 275         .open           = sched_dynamic_open,
 276         .write          = sched_dynamic_write,
 277         .read           = seq_read,
 278         .llseek         = seq_lseek,
 279         .release        = single_release,
 280 };
 281
 282 #endif /* CONFIG_PREEMPT_DYNAMIC */
 283
 284 __read_mostly bool sched_debug_verbose;
 285
 286 #ifdef CONFIG_SMP
 287 static struct dentry           *sd_dentry;
 288
 289
 290 static ssize_t sched_verbose_write(struct file *filp, const char __user *ubuf,
 291                                   size_t cnt, loff_t *ppos)
 292 {
 293         ssize_t result;
 294         bool orig;
 295
 296         cpus_read_lock();
 297         sched_domains_mutex_lock();
 298
 299         orig = sched_debug_verbose;
 300         result = debugfs_write_file_bool(filp, ubuf, cnt, ppos);
 301
 302         if (sched_debug_verbose && !orig)
 303                 update_sched_domain_debugfs();
 304         else if (!sched_debug_verbose && orig) {
 305                 debugfs_remove(sd_dentry);
 306                 sd_dentry = NULL;
 307         }
 308
 309         sched_domains_mutex_unlock();
 310         cpus_read_unlock();
 311
 312         return result;
 313 }
 314 #else
 315 #define sched_verbose_write debugfs_write_file_bool
 316 #endif
 317
 318 static const struct file_operations sched_verbose_fops = {
 319         .read =         debugfs_read_file_bool,
 320         .write =        sched_verbose_write,
 321         .open =         simple_open,
 322         .llseek =       default_llseek,
 323 };
 324
 325 static const struct seq_operations sched_debug_sops;
 326
 327 static int sched_debug_open(struct inode *inode, struct file *filp)
 328 {
 329         return seq_open(filp, &sched_debug_sops);
 330 }
 331
 332 static const struct file_operations sched_debug_fops = {
 333         .open           = sched_debug_open,
 334         .read           = seq_read,
 335         .llseek         = seq_lseek,
 336         .release        = seq_release,
 337 };
 338
 339 enum dl_param {
 340         DL_RUNTIME = 0,
 341         DL_PERIOD,
 342 };
 343
 344 static unsigned long fair_server_period_max = (1UL << 22) * NSEC_PER_USEC; /* ~4 seconds */
 345 static unsigned long fair_server_period_min = (100) * NSEC_PER_USEC;     /* 100 us */
 346
 347 static ssize_t sched_fair_server_write(struct file *filp, const char __user *ubuf,
 348                                        size_t cnt, loff_t *ppos, enum dl_param param)
 349 {
 350         long cpu = (long) ((struct seq_file *) filp->private_data)->private;
 351         struct rq *rq = cpu_rq(cpu);
 352         u64 runtime, period;
 353         size_t err;
 354         int retval;
 355         u64 value;
 356
 357         err = kstrtoull_from_user(ubuf, cnt, 10, &value);
 358         if (err)
 359                 return err;
 360
 361         scoped_guard (rq_lock_irqsave, rq) {
 362                 runtime  = rq->fair_server.dl_runtime;
 363                 period = rq->fair_server.dl_period;
 364
 365                 switch (param) {
 366                 case DL_RUNTIME:
 367                         if (runtime == value)
 368                                 break;
 369                         runtime = value;
 370                         break;
 371                 case DL_PERIOD:
 372                         if (value == period)
 373                                 break;
 374                         period = value;
 375                         break;
 376                 }
 377
 378                 if (runtime > period ||
 379                     period > fair_server_period_max ||
 380                     period < fair_server_period_min) {
 381                         return  -EINVAL;
 382                 }
 383
 384                 if (rq->cfs.h_nr_queued) {
 385                         update_rq_clock(rq);
 386                         dl_server_stop(&rq->fair_server);
 387                 }
 388
 389                 retval = dl_server_apply_params(&rq->fair_server, runtime, period, 0);
 390                 if (retval)
 391                         cnt = retval;
 392
 393                 if (!runtime)
 394                         printk_deferred("Fair server disabled in CPU %d, system may crash due to starvation.\n",
 395                                         cpu_of(rq));
 396
 397                 if (rq->cfs.h_nr_queued)
 398                         dl_server_start(&rq->fair_server);
 399         }
 400
 401         *ppos += cnt;
 402         return cnt;
 403 }
 404
 405 static size_t sched_fair_server_show(struct seq_file *m, void *v, enum dl_param param)
 406 {
 407         unsigned long cpu = (unsigned long) m->private;
 408         struct rq *rq = cpu_rq(cpu);
 409         u64 value;
 410
 411         switch (param) {
 412         case DL_RUNTIME:
 413                 value = rq->fair_server.dl_runtime;
 414                 break;
 415         case DL_PERIOD:
 416                 value = rq->fair_server.dl_period;
 417                 break;
 418         }
 419
 420         seq_printf(m, "%llu\n", value);
 421         return 0;
 422
 423 }
 424
 425 static ssize_t
 426 sched_fair_server_runtime_write(struct file *filp, const char __user *ubuf,
 427                                 size_t cnt, loff_t *ppos)
 428 {
 429         return sched_fair_server_write(filp, ubuf, cnt, ppos, DL_RUNTIME);
 430 }
 431
 432 static int sched_fair_server_runtime_show(struct seq_file *m, void *v)
 433 {
 434         return sched_fair_server_show(m, v, DL_RUNTIME);
 435 }
 436
 437 static int sched_fair_server_runtime_open(struct inode *inode, struct file *filp)
 438 {
 439         return single_open(filp, sched_fair_server_runtime_show, inode->i_private);
 440 }
 441
 442 static const struct file_operations fair_server_runtime_fops = {
 443         .open           = sched_fair_server_runtime_open,
 444         .write          = sched_fair_server_runtime_write,
 445         .read           = seq_read,
 446         .llseek         = seq_lseek,
 447         .release        = single_release,
 448 };
 449
 450 static ssize_t
 451 sched_fair_server_period_write(struct file *filp, const char __user *ubuf,
 452                                size_t cnt, loff_t *ppos)
 453 {
 454         return sched_fair_server_write(filp, ubuf, cnt, ppos, DL_PERIOD);
 455 }
 456
 457 static int sched_fair_server_period_show(struct seq_file *m, void *v)
 458 {
 459         return sched_fair_server_show(m, v, DL_PERIOD);
 460 }
 461
 462 static int sched_fair_server_period_open(struct inode *inode, struct file *filp)
 463 {
 464         return single_open(filp, sched_fair_server_period_show, inode->i_private);
 465 }
 466
 467 static const struct file_operations fair_server_period_fops = {
 468         .open           = sched_fair_server_period_open,
 469         .write          = sched_fair_server_period_write,
 470         .read           = seq_read,
 471         .llseek         = seq_lseek,
 472         .release        = single_release,
 473 };
 474
 475 static struct dentry *debugfs_sched;
 476
 477 static void debugfs_fair_server_init(void)
 478 {
 479         struct dentry *d_fair;
 480         unsigned long cpu;
 481
 482         d_fair = debugfs_create_dir("fair_server", debugfs_sched);
 483         if (!d_fair)
 484                 return;
 485
 486         for_each_possible_cpu(cpu) {
 487                 struct dentry *d_cpu;
 488                 char buf[32];
 489
 490                 snprintf(buf, sizeof(buf), "cpu%lu", cpu);
 491                 d_cpu = debugfs_create_dir(buf, d_fair);
 492
 493                 debugfs_create_file("runtime", 0644, d_cpu, (void *) cpu, &fair_server_runtime_fops);
 494                 debugfs_create_file("period", 0644, d_cpu, (void *) cpu, &fair_server_period_fops);
 495         }
 496 }
 497
 498 static __init int sched_init_debug(void)
 499 {
 500         struct dentry __maybe_unused *numa;
 501
 502         debugfs_sched = debugfs_create_dir("sched", NULL);
 503
 504         debugfs_create_file("features", 0644, debugfs_sched, NULL, &sched_feat_fops);
 505         debugfs_create_file_unsafe("verbose", 0644, debugfs_sched, &sched_debug_verbose, &sched_verbose_fops);
 506 #ifdef CONFIG_PREEMPT_DYNAMIC
 507         debugfs_create_file("preempt", 0644, debugfs_sched, NULL, &sched_dynamic_fops);
 508 #endif
 509
 510         debugfs_create_u32("base_slice_ns", 0644, debugfs_sched, &sysctl_sched_base_slice);
 511
 512         debugfs_create_u32("latency_warn_ms", 0644, debugfs_sched, &sysctl_resched_latency_warn_ms);
 513         debugfs_create_u32("latency_warn_once", 0644, debugfs_sched, &sysctl_resched_latency_warn_once);
 514
 515 #ifdef CONFIG_SMP
 516         debugfs_create_file("tunable_scaling", 0644, debugfs_sched, NULL, &sched_scaling_fops);
 517         debugfs_create_u32("migration_cost_ns", 0644, debugfs_sched, &sysctl_sched_migration_cost);
 518         debugfs_create_u32("nr_migrate", 0644, debugfs_sched, &sysctl_sched_nr_migrate);
 519
 520         sched_domains_mutex_lock();
 521         update_sched_domain_debugfs();
 522         sched_domains_mutex_unlock();
 523 #endif
 524
 525 #ifdef CONFIG_NUMA_BALANCING
 526         numa = debugfs_create_dir("numa_balancing", debugfs_sched);
 527
 528         debugfs_create_u32("scan_delay_ms", 0644, numa, &sysctl_numa_balancing_scan_delay);
 529         debugfs_create_u32("scan_period_min_ms", 0644, numa, &sysctl_numa_balancing_scan_period_min);
 530         debugfs_create_u32("scan_period_max_ms", 0644, numa, &sysctl_numa_balancing_scan_period_max);
 531         debugfs_create_u32("scan_size_mb", 0644, numa, &sysctl_numa_balancing_scan_size);
 532         debugfs_create_u32("hot_threshold_ms", 0644, numa, &sysctl_numa_balancing_hot_threshold);
 533 #endif
 534
 535         debugfs_create_file("debug", 0444, debugfs_sched, NULL, &sched_debug_fops);
 536
 537         debugfs_fair_server_init();
 538
 539         return 0;
 540 }
 541 late_initcall(sched_init_debug);
 542
 543 #ifdef CONFIG_SMP
 544
 545 static cpumask_var_t            sd_sysctl_cpus;
 546
 547 static int sd_flags_show(struct seq_file *m, void *v)
 548 {
 549         unsigned long flags = *(unsigned int *)m->private;
 550         int idx;
 551
 552         for_each_set_bit(idx, &flags, __SD_FLAG_CNT) {
 553                 seq_puts(m, sd_flag_debug[idx].name);
 554                 seq_puts(m, " ");
 555         }
 556         seq_puts(m, "\n");
 557
 558         return 0;
 559 }
 560
 561 static int sd_flags_open(struct inode *inode, struct file *file)
 562 {
 563         return single_open(file, sd_flags_show, inode->i_private);
 564 }
 565
 566 static const struct file_operations sd_flags_fops = {
 567         .open           = sd_flags_open,
 568         .read           = seq_read,
 569         .llseek         = seq_lseek,
 570         .release        = single_release,
 571 };
 572
 573 static void register_sd(struct sched_domain *sd, struct dentry *parent)
 574 {
 575 #define SDM(type, mode, member) \
 576         debugfs_create_##type(#member, mode, parent, &sd->member)
 577
 578         SDM(ulong, 0644, min_interval);
 579         SDM(ulong, 0644, max_interval);
 580         SDM(u64,   0644, max_newidle_lb_cost);
 581         SDM(u32,   0644, busy_factor);
 582         SDM(u32,   0644, imbalance_pct);
 583         SDM(u32,   0644, cache_nice_tries);
 584         SDM(str,   0444, name);
 585
 586 #undef SDM
 587
 588         debugfs_create_file("flags", 0444, parent, &sd->flags, &sd_flags_fops);
 589         debugfs_create_file("groups_flags", 0444, parent, &sd->groups->flags, &sd_flags_fops);
 590         debugfs_create_u32("level", 0444, parent, (u32 *)&sd->level);
 591
 592         if (sd->flags & SD_ASYM_PACKING)
 593                 debugfs_create_u32("group_asym_prefer_cpu", 0444, parent,
 594                                    (u32 *)&sd->groups->asym_prefer_cpu);
 595 }
 596
 597 void update_sched_domain_debugfs(void)
 598 {
 599         int cpu, i;
 600
 601         /*
 602          * This can unfortunately be invoked before sched_debug_init() creates
 603          * the debug directory. Don't touch sd_sysctl_cpus until then.
 604          */
 605         if (!debugfs_sched)
 606                 return;
 607
 608         if (!sched_debug_verbose)
 609                 return;
 610
 611         if (!cpumask_available(sd_sysctl_cpus)) {
 612                 if (!alloc_cpumask_var(&sd_sysctl_cpus, GFP_KERNEL))
 613                         return;
 614                 cpumask_copy(sd_sysctl_cpus, cpu_possible_mask);
 615         }
 616
 617         if (!sd_dentry) {
 618                 sd_dentry = debugfs_create_dir("domains", debugfs_sched);
 619
 620                 /* rebuild sd_sysctl_cpus if empty since it gets cleared below */
 621                 if (cpumask_empty(sd_sysctl_cpus))
 622                         cpumask_copy(sd_sysctl_cpus, cpu_online_mask);
 623         }
 624
 625         for_each_cpu(cpu, sd_sysctl_cpus) {
 626                 struct sched_domain *sd;
 627                 struct dentry *d_cpu;
 628                 char buf[32];
 629
 630                 snprintf(buf, sizeof(buf), "cpu%d", cpu);
 631                 debugfs_lookup_and_remove(buf, sd_dentry);
 632                 d_cpu = debugfs_create_dir(buf, sd_dentry);
 633
 634                 i = 0;
 635                 for_each_domain(cpu, sd) {
 636                         struct dentry *d_sd;
 637
 638                         snprintf(buf, sizeof(buf), "domain%d", i);
 639                         d_sd = debugfs_create_dir(buf, d_cpu);
 640
 641                         register_sd(sd, d_sd);
 642                         i++;
 643                 }
 644
 645                 __cpumask_clear_cpu(cpu, sd_sysctl_cpus);
 646         }
 647 }
 648
 649 void dirty_sched_domain_sysctl(int cpu)
 650 {
 651         if (cpumask_available(sd_sysctl_cpus))
 652                 __cpumask_set_cpu(cpu, sd_sysctl_cpus);
 653 }
 654
 655 #endif /* CONFIG_SMP */
 656
 657 #ifdef CONFIG_FAIR_GROUP_SCHED
 658 static void print_cfs_group_stats(struct seq_file *m, int cpu, struct task_group *tg)
 659 {
 660         struct sched_entity *se = tg->se[cpu];
 661
 662 #define P(F)            SEQ_printf(m, "  .%-30s: %lld\n",       #F, (long long)F)
 663 #define P_SCHEDSTAT(F)  SEQ_printf(m, "  .%-30s: %lld\n",       \
 664                 #F, (long long)schedstat_val(stats->F))
 665 #define PN(F)           SEQ_printf(m, "  .%-30s: %lld.%06ld\n", #F, SPLIT_NS((long long)F))
 666 #define PN_SCHEDSTAT(F) SEQ_printf(m, "  .%-30s: %lld.%06ld\n", \
 667                 #F, SPLIT_NS((long long)schedstat_val(stats->F)))
 668
 669         if (!se)
 670                 return;
 671
 672         PN(se->exec_start);
 673         PN(se->vruntime);
 674         PN(se->sum_exec_runtime);
 675
 676         if (schedstat_enabled()) {
 677                 struct sched_statistics *stats;
 678                 stats = __schedstats_from_se(se);
 679
 680                 PN_SCHEDSTAT(wait_start);
 681                 PN_SCHEDSTAT(sleep_start);
 682                 PN_SCHEDSTAT(block_start);
 683                 PN_SCHEDSTAT(sleep_max);
 684                 PN_SCHEDSTAT(block_max);
 685                 PN_SCHEDSTAT(exec_max);
 686                 PN_SCHEDSTAT(slice_max);
 687                 PN_SCHEDSTAT(wait_max);
 688                 PN_SCHEDSTAT(wait_sum);
 689                 P_SCHEDSTAT(wait_count);
 690         }
 691
 692         P(se->load.weight);
 693 #ifdef CONFIG_SMP
 694         P(se->avg.load_avg);
 695         P(se->avg.util_avg);
 696         P(se->avg.runnable_avg);
 697 #endif
 698
 699 #undef PN_SCHEDSTAT
 700 #undef PN
 701 #undef P_SCHEDSTAT
 702 #undef P
 703 }
 704 #endif
 705
 706 #ifdef CONFIG_CGROUP_SCHED
 707 static DEFINE_SPINLOCK(sched_debug_lock);
 708 static char group_path[PATH_MAX];
 709
 710 static void task_group_path(struct task_group *tg, char *path, int plen)
 711 {
 712         if (autogroup_path(tg, path, plen))
 713                 return;
 714
 715         cgroup_path(tg->css.cgroup, path, plen);
 716 }
 717
 718 /*
 719  * Only 1 SEQ_printf_task_group_path() caller can use the full length
 720  * group_path[] for cgroup path. Other simultaneous callers will have
 721  * to use a shorter stack buffer. A "..." suffix is appended at the end
 722  * of the stack buffer so that it will show up in case the output length
 723  * matches the given buffer size to indicate possible path name truncation.
 724  */
 725 #define SEQ_printf_task_group_path(m, tg, fmt...)                       \
 726 {                                                                       \
 727         if (spin_trylock(&sched_debug_lock)) {                          \
 728                 task_group_path(tg, group_path, sizeof(group_path));    \
 729                 SEQ_printf(m, fmt, group_path);                         \
 730                 spin_unlock(&sched_debug_lock);                         \
 731         } else {                                                        \
 732                 char buf[128];                                          \
 733                 char *bufend = buf + sizeof(buf) - 3;                   \
 734                 task_group_path(tg, buf, bufend - buf);                 \
 735                 strcpy(bufend - 1, "...");                              \
 736                 SEQ_printf(m, fmt, buf);                                \
 737         }                                                               \
 738 }
 739 #endif
 740
 741 static void
 742 print_task(struct seq_file *m, struct rq *rq, struct task_struct *p)
 743 {
 744         if (task_current(rq, p))
 745                 SEQ_printf(m, ">R");
 746         else
 747                 SEQ_printf(m, " %c", task_state_to_char(p));
 748
 749         SEQ_printf(m, " %15s %5d %9Ld.%06ld   %c   %9Ld.%06ld %c %9Ld.%06ld %9Ld.%06ld %9Ld   %5d ",
 750                 p->comm, task_pid_nr(p),
 751                 SPLIT_NS(p->se.vruntime),
 752                 entity_eligible(cfs_rq_of(&p->se), &p->se) ? 'E' : 'N',
 753                 SPLIT_NS(p->se.deadline),
 754                 p->se.custom_slice ? 'S' : ' ',
 755                 SPLIT_NS(p->se.slice),
 756                 SPLIT_NS(p->se.sum_exec_runtime),
 757                 (long long)(p->nvcsw + p->nivcsw),
 758                 p->prio);
 759
 760         SEQ_printf(m, "%9lld.%06ld %9lld.%06ld %9lld.%06ld",
 761                 SPLIT_NS(schedstat_val_or_zero(p->stats.wait_sum)),
 762                 SPLIT_NS(schedstat_val_or_zero(p->stats.sum_sleep_runtime)),
 763                 SPLIT_NS(schedstat_val_or_zero(p->stats.sum_block_runtime)));
 764
 765 #ifdef CONFIG_NUMA_BALANCING
 766         SEQ_printf(m, "   %d      %d", task_node(p), task_numa_group_id(p));
 767 #endif
 768 #ifdef CONFIG_CGROUP_SCHED
 769         SEQ_printf_task_group_path(m, task_group(p), "        %s")
 770 #endif
 771
 772         SEQ_printf(m, "\n");
 773 }
 774
 775 static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu)
 776 {
 777         struct task_struct *g, *p;
 778
 779         SEQ_printf(m, "\n");
 780         SEQ_printf(m, "runnable tasks:\n");
 781         SEQ_printf(m, " S            task   PID       vruntime   eligible    "
 782                    "deadline             slice          sum-exec      switches  "
 783                    "prio         wait-time        sum-sleep       sum-block"
 784 #ifdef CONFIG_NUMA_BALANCING
 785                    "  node   group-id"
 786 #endif
 787 #ifdef CONFIG_CGROUP_SCHED
 788                    "  group-path"
 789 #endif
 790                    "\n");
 791         SEQ_printf(m, "-------------------------------------------------------"
 792                    "------------------------------------------------------"
 793                    "------------------------------------------------------"
 794 #ifdef CONFIG_NUMA_BALANCING
 795                    "--------------"
 796 #endif
 797 #ifdef CONFIG_CGROUP_SCHED
 798                    "--------------"
 799 #endif
 800                    "\n");
 801
 802         rcu_read_lock();
 803         for_each_process_thread(g, p) {
 804                 if (task_cpu(p) != rq_cpu)
 805                         continue;
 806
 807                 print_task(m, rq, p);
 808         }
 809         rcu_read_unlock();
 810 }
 811
 812 void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
 813 {
 814         s64 left_vruntime = -1, min_vruntime, right_vruntime = -1, left_deadline = -1, spread;
 815         struct sched_entity *last, *first, *root;
 816         struct rq *rq = cpu_rq(cpu);
 817         unsigned long flags;
 818
 819 #ifdef CONFIG_FAIR_GROUP_SCHED
 820         SEQ_printf(m, "\n");
 821         SEQ_printf_task_group_path(m, cfs_rq->tg, "cfs_rq[%d]:%s\n", cpu);
 822 #else
 823         SEQ_printf(m, "\n");
 824         SEQ_printf(m, "cfs_rq[%d]:\n", cpu);
 825 #endif
 826
 827         raw_spin_rq_lock_irqsave(rq, flags);
 828         root = __pick_root_entity(cfs_rq);
 829         if (root)
 830                 left_vruntime = root->min_vruntime;
 831         first = __pick_first_entity(cfs_rq);
 832         if (first)
 833                 left_deadline = first->deadline;
 834         last = __pick_last_entity(cfs_rq);
 835         if (last)
 836                 right_vruntime = last->vruntime;
 837         min_vruntime = cfs_rq->min_vruntime;
 838         raw_spin_rq_unlock_irqrestore(rq, flags);
 839
 840         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", "left_deadline",
 841                         SPLIT_NS(left_deadline));
 842         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", "left_vruntime",
 843                         SPLIT_NS(left_vruntime));
 844         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", "min_vruntime",
 845                         SPLIT_NS(min_vruntime));
 846         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", "avg_vruntime",
 847                         SPLIT_NS(avg_vruntime(cfs_rq)));
 848         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", "right_vruntime",
 849                         SPLIT_NS(right_vruntime));
 850         spread = right_vruntime - left_vruntime;
 851         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", "spread", SPLIT_NS(spread));
 852         SEQ_printf(m, "  .%-30s: %d\n", "nr_queued", cfs_rq->nr_queued);
 853         SEQ_printf(m, "  .%-30s: %d\n", "h_nr_runnable", cfs_rq->h_nr_runnable);
 854         SEQ_printf(m, "  .%-30s: %d\n", "h_nr_queued", cfs_rq->h_nr_queued);
 855         SEQ_printf(m, "  .%-30s: %d\n", "h_nr_idle", cfs_rq->h_nr_idle);
 856         SEQ_printf(m, "  .%-30s: %ld\n", "load", cfs_rq->load.weight);
 857 #ifdef CONFIG_SMP
 858         SEQ_printf(m, "  .%-30s: %lu\n", "load_avg",
 859                         cfs_rq->avg.load_avg);
 860         SEQ_printf(m, "  .%-30s: %lu\n", "runnable_avg",
 861                         cfs_rq->avg.runnable_avg);
 862         SEQ_printf(m, "  .%-30s: %lu\n", "util_avg",
 863                         cfs_rq->avg.util_avg);
 864         SEQ_printf(m, "  .%-30s: %u\n", "util_est",
 865                         cfs_rq->avg.util_est);
 866         SEQ_printf(m, "  .%-30s: %ld\n", "removed.load_avg",
 867                         cfs_rq->removed.load_avg);
 868         SEQ_printf(m, "  .%-30s: %ld\n", "removed.util_avg",
 869                         cfs_rq->removed.util_avg);
 870         SEQ_printf(m, "  .%-30s: %ld\n", "removed.runnable_avg",
 871                         cfs_rq->removed.runnable_avg);
 872 #ifdef CONFIG_FAIR_GROUP_SCHED
 873         SEQ_printf(m, "  .%-30s: %lu\n", "tg_load_avg_contrib",
 874                         cfs_rq->tg_load_avg_contrib);
 875         SEQ_printf(m, "  .%-30s: %ld\n", "tg_load_avg",
 876                         atomic_long_read(&cfs_rq->tg->load_avg));
 877 #endif
 878 #endif
 879 #ifdef CONFIG_CFS_BANDWIDTH
 880         SEQ_printf(m, "  .%-30s: %d\n", "throttled",
 881                         cfs_rq->throttled);
 882         SEQ_printf(m, "  .%-30s: %d\n", "throttle_count",
 883                         cfs_rq->throttle_count);
 884 #endif
 885
 886 #ifdef CONFIG_FAIR_GROUP_SCHED
 887         print_cfs_group_stats(m, cpu, cfs_rq->tg);
 888 #endif
 889 }
 890
 891 void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq)
 892 {
 893 #ifdef CONFIG_RT_GROUP_SCHED
 894         SEQ_printf(m, "\n");
 895         SEQ_printf_task_group_path(m, rt_rq->tg, "rt_rq[%d]:%s\n", cpu);
 896 #else
 897         SEQ_printf(m, "\n");
 898         SEQ_printf(m, "rt_rq[%d]:\n", cpu);
 899 #endif
 900
 901 #define P(x) \
 902         SEQ_printf(m, "  .%-30s: %Ld\n", #x, (long long)(rt_rq->x))
 903 #define PU(x) \
 904         SEQ_printf(m, "  .%-30s: %lu\n", #x, (unsigned long)(rt_rq->x))
 905 #define PN(x) \
 906         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rt_rq->x))
 907
 908         PU(rt_nr_running);
 909
 910 #ifdef CONFIG_RT_GROUP_SCHED
 911         P(rt_throttled);
 912         PN(rt_time);
 913         PN(rt_runtime);
 914 #endif
 915
 916 #undef PN
 917 #undef PU
 918 #undef P
 919 }
 920
 921 void print_dl_rq(struct seq_file *m, int cpu, struct dl_rq *dl_rq)
 922 {
 923         struct dl_bw *dl_bw;
 924
 925         SEQ_printf(m, "\n");
 926         SEQ_printf(m, "dl_rq[%d]:\n", cpu);
 927
 928 #define PU(x) \
 929         SEQ_printf(m, "  .%-30s: %lu\n", #x, (unsigned long)(dl_rq->x))
 930
 931         PU(dl_nr_running);
 932 #ifdef CONFIG_SMP
 933         dl_bw = &cpu_rq(cpu)->rd->dl_bw;
 934 #else
 935         dl_bw = &dl_rq->dl_bw;
 936 #endif
 937         SEQ_printf(m, "  .%-30s: %lld\n", "dl_bw->bw", dl_bw->bw);
 938         SEQ_printf(m, "  .%-30s: %lld\n", "dl_bw->total_bw", dl_bw->total_bw);
 939
 940 #undef PU
 941 }
 942
 943 static void print_cpu(struct seq_file *m, int cpu)
 944 {
 945         struct rq *rq = cpu_rq(cpu);
 946
 947 #ifdef CONFIG_X86
 948         {
 949                 unsigned int freq = cpu_khz ? : 1;
 950
 951                 SEQ_printf(m, "cpu#%d, %u.%03u MHz\n",
 952                            cpu, freq / 1000, (freq % 1000));
 953         }
 954 #else
 955         SEQ_printf(m, "cpu#%d\n", cpu);
 956 #endif
 957
 958 #define P(x)                                                            \
 959 do {                                                                    \
 960         if (sizeof(rq->x) == 4)                                         \
 961                 SEQ_printf(m, "  .%-30s: %d\n", #x, (int)(rq->x));      \
 962         else                                                            \
 963                 SEQ_printf(m, "  .%-30s: %Ld\n", #x, (long long)(rq->x));\
 964 } while (0)
 965
 966 #define PN(x) \
 967         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rq->x))
 968
 969         P(nr_running);
 970         P(nr_switches);
 971         P(nr_uninterruptible);
 972         PN(next_balance);
 973         SEQ_printf(m, "  .%-30s: %ld\n", "curr->pid", (long)(task_pid_nr(rq->curr)));
 974         PN(clock);
 975         PN(clock_task);
 976 #undef P
 977 #undef PN
 978
 979 #ifdef CONFIG_SMP
 980 #define P64(n) SEQ_printf(m, "  .%-30s: %Ld\n", #n, rq->n);
 981         P64(avg_idle);
 982         P64(max_idle_balance_cost);
 983 #undef P64
 984 #endif
 985
 986 #define P(n) SEQ_printf(m, "  .%-30s: %d\n", #n, schedstat_val(rq->n));
 987         if (schedstat_enabled()) {
 988                 P(yld_count);
 989                 P(sched_count);
 990                 P(sched_goidle);
 991                 P(ttwu_count);
 992                 P(ttwu_local);
 993         }
 994 #undef P
 995
 996         print_cfs_stats(m, cpu);
 997         print_rt_stats(m, cpu);
 998         print_dl_stats(m, cpu);
 999
1000         print_rq(m, rq, cpu);
1001         SEQ_printf(m, "\n");
1002 }
1003
1004 static const char *sched_tunable_scaling_names[] = {
1005         "none",
1006         "logarithmic",
1007         "linear"
1008 };
1009
1010 static void sched_debug_header(struct seq_file *m)
1011 {
1012         u64 ktime, sched_clk, cpu_clk;
1013         unsigned long flags;
1014
1015         local_irq_save(flags);
1016         ktime = ktime_to_ns(ktime_get());
1017         sched_clk = sched_clock();
1018         cpu_clk = local_clock();
1019         local_irq_restore(flags);
1020
1021         SEQ_printf(m, "Sched Debug Version: v0.11, %s %.*s\n",
1022                 init_utsname()->release,
1023                 (int)strcspn(init_utsname()->version, " "),
1024                 init_utsname()->version);
1025
1026 #define P(x) \
1027         SEQ_printf(m, "%-40s: %Ld\n", #x, (long long)(x))
1028 #define PN(x) \
1029         SEQ_printf(m, "%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x))
1030         PN(ktime);
1031         PN(sched_clk);
1032         PN(cpu_clk);
1033         P(jiffies);
1034 #ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
1035         P(sched_clock_stable());
1036 #endif
1037 #undef PN
1038 #undef P
1039
1040         SEQ_printf(m, "\n");
1041         SEQ_printf(m, "sysctl_sched\n");
1042
1043 #define P(x) \
1044         SEQ_printf(m, "  .%-40s: %Ld\n", #x, (long long)(x))
1045 #define PN(x) \
1046         SEQ_printf(m, "  .%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x))
1047         PN(sysctl_sched_base_slice);
1048         P(sysctl_sched_features);
1049 #undef PN
1050 #undef P
1051
1052         SEQ_printf(m, "  .%-40s: %d (%s)\n",
1053                 "sysctl_sched_tunable_scaling",
1054                 sysctl_sched_tunable_scaling,
1055                 sched_tunable_scaling_names[sysctl_sched_tunable_scaling]);
1056         SEQ_printf(m, "\n");
1057 }
1058
1059 static int sched_debug_show(struct seq_file *m, void *v)
1060 {
1061         int cpu = (unsigned long)(v - 2);
1062
1063         if (cpu != -1)
1064                 print_cpu(m, cpu);
1065         else
1066                 sched_debug_header(m);
1067
1068         return 0;
1069 }
1070
1071 void sysrq_sched_debug_show(void)
1072 {
1073         int cpu;
1074
1075         sched_debug_header(NULL);
1076         for_each_online_cpu(cpu) {
1077                 /*
1078                  * Need to reset softlockup watchdogs on all CPUs, because
1079                  * another CPU might be blocked waiting for us to process
1080                  * an IPI or stop_machine.
1081                  */
1082                 touch_nmi_watchdog();
1083                 touch_all_softlockup_watchdogs();
1084                 print_cpu(NULL, cpu);
1085         }
1086 }
1087
1088 /*
1089  * This iterator needs some explanation.
1090  * It returns 1 for the header position.
1091  * This means 2 is CPU 0.
1092  * In a hotplugged system some CPUs, including CPU 0, may be missing so we have
1093  * to use cpumask_* to iterate over the CPUs.
1094  */
1095 static void *sched_debug_start(struct seq_file *file, loff_t *offset)
1096 {
1097         unsigned long n = *offset;
1098
1099         if (n == 0)
1100                 return (void *) 1;
1101
1102         n--;
1103
1104         if (n > 0)
1105                 n = cpumask_next(n - 1, cpu_online_mask);
1106         else
1107                 n = cpumask_first(cpu_online_mask);
1108
1109         *offset = n + 1;
1110
1111         if (n < nr_cpu_ids)
1112                 return (void *)(unsigned long)(n + 2);
1113
1114         return NULL;
1115 }
1116
1117 static void *sched_debug_next(struct seq_file *file, void *data, loff_t *offset)
1118 {
1119         (*offset)++;
1120         return sched_debug_start(file, offset);
1121 }
1122
1123 static void sched_debug_stop(struct seq_file *file, void *data)
1124 {
1125 }
1126
1127 static const struct seq_operations sched_debug_sops = {
1128         .start          = sched_debug_start,
1129         .next           = sched_debug_next,
1130         .stop           = sched_debug_stop,
1131         .show           = sched_debug_show,
1132 };
1133
1134 #define __PS(S, F) SEQ_printf(m, "%-45s:%21Ld\n", S, (long long)(F))
1135 #define __P(F) __PS(#F, F)
1136 #define   P(F) __PS(#F, p->F)
1137 #define   PM(F, M) __PS(#F, p->F & (M))
1138 #define __PSN(S, F) SEQ_printf(m, "%-45s:%14Ld.%06ld\n", S, SPLIT_NS((long long)(F)))
1139 #define __PN(F) __PSN(#F, F)
1140 #define   PN(F) __PSN(#F, p->F)
1141
1142
1143 #ifdef CONFIG_NUMA_BALANCING
1144 void print_numa_stats(struct seq_file *m, int node, unsigned long tsf,
1145                 unsigned long tpf, unsigned long gsf, unsigned long gpf)
1146 {
1147         SEQ_printf(m, "numa_faults node=%d ", node);
1148         SEQ_printf(m, "task_private=%lu task_shared=%lu ", tpf, tsf);
1149         SEQ_printf(m, "group_private=%lu group_shared=%lu\n", gpf, gsf);
1150 }
1151 #endif
1152
1153
1154 static void sched_show_numa(struct task_struct *p, struct seq_file *m)
1155 {
1156 #ifdef CONFIG_NUMA_BALANCING
1157         if (p->mm)
1158                 P(mm->numa_scan_seq);
1159
1160         P(numa_pages_migrated);
1161         P(numa_preferred_nid);
1162         P(total_numa_faults);
1163         SEQ_printf(m, "current_node=%d, numa_group_id=%d\n",
1164                         task_node(p), task_numa_group_id(p));
1165         show_numa_stats(p, m);
1166 #endif
1167 }
1168
1169 void proc_sched_show_task(struct task_struct *p, struct pid_namespace *ns,
1170                                                   struct seq_file *m)
1171 {
1172         unsigned long nr_switches;
1173
1174         SEQ_printf(m, "%s (%d, #threads: %d)\n", p->comm, task_pid_nr_ns(p, ns),
1175                                                 get_nr_threads(p));
1176         SEQ_printf(m,
1177                 "---------------------------------------------------------"
1178                 "----------\n");
1179
1180 #define P_SCHEDSTAT(F)  __PS(#F, schedstat_val(p->stats.F))
1181 #define PN_SCHEDSTAT(F) __PSN(#F, schedstat_val(p->stats.F))
1182
1183         PN(se.exec_start);
1184         PN(se.vruntime);
1185         PN(se.sum_exec_runtime);
1186
1187         nr_switches = p->nvcsw + p->nivcsw;
1188
1189         P(se.nr_migrations);
1190
1191         if (schedstat_enabled()) {
1192                 u64 avg_atom, avg_per_cpu;
1193
1194                 PN_SCHEDSTAT(sum_sleep_runtime);
1195                 PN_SCHEDSTAT(sum_block_runtime);
1196                 PN_SCHEDSTAT(wait_start);
1197                 PN_SCHEDSTAT(sleep_start);
1198                 PN_SCHEDSTAT(block_start);
1199                 PN_SCHEDSTAT(sleep_max);
1200                 PN_SCHEDSTAT(block_max);
1201                 PN_SCHEDSTAT(exec_max);
1202                 PN_SCHEDSTAT(slice_max);
1203                 PN_SCHEDSTAT(wait_max);
1204                 PN_SCHEDSTAT(wait_sum);
1205                 P_SCHEDSTAT(wait_count);
1206                 PN_SCHEDSTAT(iowait_sum);
1207                 P_SCHEDSTAT(iowait_count);
1208                 P_SCHEDSTAT(nr_migrations_cold);
1209                 P_SCHEDSTAT(nr_failed_migrations_affine);
1210                 P_SCHEDSTAT(nr_failed_migrations_running);
1211                 P_SCHEDSTAT(nr_failed_migrations_hot);
1212                 P_SCHEDSTAT(nr_forced_migrations);
1213                 P_SCHEDSTAT(nr_wakeups);
1214                 P_SCHEDSTAT(nr_wakeups_sync);
1215                 P_SCHEDSTAT(nr_wakeups_migrate);
1216                 P_SCHEDSTAT(nr_wakeups_local);
1217                 P_SCHEDSTAT(nr_wakeups_remote);
1218                 P_SCHEDSTAT(nr_wakeups_affine);
1219                 P_SCHEDSTAT(nr_wakeups_affine_attempts);
1220                 P_SCHEDSTAT(nr_wakeups_passive);
1221                 P_SCHEDSTAT(nr_wakeups_idle);
1222
1223                 avg_atom = p->se.sum_exec_runtime;
1224                 if (nr_switches)
1225                         avg_atom = div64_ul(avg_atom, nr_switches);
1226                 else
1227                         avg_atom = -1LL;
1228
1229                 avg_per_cpu = p->se.sum_exec_runtime;
1230                 if (p->se.nr_migrations) {
1231                         avg_per_cpu = div64_u64(avg_per_cpu,
1232                                                 p->se.nr_migrations);
1233                 } else {
1234                         avg_per_cpu = -1LL;
1235                 }
1236
1237                 __PN(avg_atom);
1238                 __PN(avg_per_cpu);
1239
1240 #ifdef CONFIG_SCHED_CORE
1241                 PN_SCHEDSTAT(core_forceidle_sum);
1242 #endif
1243         }
1244
1245         __P(nr_switches);
1246         __PS("nr_voluntary_switches", p->nvcsw);
1247         __PS("nr_involuntary_switches", p->nivcsw);
1248
1249         P(se.load.weight);
1250 #ifdef CONFIG_SMP
1251         P(se.avg.load_sum);
1252         P(se.avg.runnable_sum);
1253         P(se.avg.util_sum);
1254         P(se.avg.load_avg);
1255         P(se.avg.runnable_avg);
1256         P(se.avg.util_avg);
1257         P(se.avg.last_update_time);
1258         PM(se.avg.util_est, ~UTIL_AVG_UNCHANGED);
1259 #endif
1260 #ifdef CONFIG_UCLAMP_TASK
1261         __PS("uclamp.min", p->uclamp_req[UCLAMP_MIN].value);
1262         __PS("uclamp.max", p->uclamp_req[UCLAMP_MAX].value);
1263         __PS("effective uclamp.min", uclamp_eff_value(p, UCLAMP_MIN));
1264         __PS("effective uclamp.max", uclamp_eff_value(p, UCLAMP_MAX));
1265 #endif
1266         P(policy);
1267         P(prio);
1268         if (task_has_dl_policy(p)) {
1269                 P(dl.runtime);
1270                 P(dl.deadline);
1271         } else if (fair_policy(p->policy)) {
1272                 P(se.slice);
1273         }
1274 #ifdef CONFIG_SCHED_CLASS_EXT
1275         __PS("ext.enabled", task_on_scx(p));
1276 #endif
1277 #undef PN_SCHEDSTAT
1278 #undef P_SCHEDSTAT
1279
1280         {
1281                 unsigned int this_cpu = raw_smp_processor_id();
1282                 u64 t0, t1;
1283
1284                 t0 = cpu_clock(this_cpu);
1285                 t1 = cpu_clock(this_cpu);
1286                 __PS("clock-delta", t1-t0);
1287         }
1288
1289         sched_show_numa(p, m);
1290 }
1291
1292 void proc_sched_set_task(struct task_struct *p)
1293 {
1294 #ifdef CONFIG_SCHEDSTATS
1295         memset(&p->stats, 0, sizeof(p->stats));
1296 #endif
1297 }
1298
1299 void resched_latency_warn(int cpu, u64 latency)
1300 {
1301         static DEFINE_RATELIMIT_STATE(latency_check_ratelimit, 60 * 60 * HZ, 1);
1302
1303         if (likely(!__ratelimit(&latency_check_ratelimit)))
1304                 return;
1305
1306         pr_err("sched: CPU %d need_resched set for > %llu ns (%d ticks) without schedule\n",
1307                cpu, latency, cpu_rq(cpu)->ticks_without_resched);
1308         dump_stack();
1309 }