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