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 #include "sched.h"
  10
  11 /*
  12  * This allows printing both to /proc/sched_debug and
  13  * to the console
  14  */
  15 #define SEQ_printf(m, x...)                     \
  16  do {                                           \
  17         if (m)                                  \
  18                 seq_printf(m, x);               \
  19         else                                    \
  20                 pr_cont(x);                     \
  21  } while (0)
  22
  23 /*
  24  * Ease the printing of nsec fields:
  25  */
  26 static long long nsec_high(unsigned long long nsec)
  27 {
  28         if ((long long)nsec < 0) {
  29                 nsec = -nsec;
  30                 do_div(nsec, 1000000);
  31                 return -nsec;
  32         }
  33         do_div(nsec, 1000000);
  34
  35         return nsec;
  36 }
  37
  38 static unsigned long nsec_low(unsigned long long nsec)
  39 {
  40         if ((long long)nsec < 0)
  41                 nsec = -nsec;
  42
  43         return do_div(nsec, 1000000);
  44 }
  45
  46 #define SPLIT_NS(x) nsec_high(x), nsec_low(x)
  47
  48 #define SCHED_FEAT(name, enabled)       \
  49         #name ,
  50
  51 static const char * const sched_feat_names[] = {
  52 #include "features.h"
  53 };
  54
  55 #undef SCHED_FEAT
  56
  57 static int sched_feat_show(struct seq_file *m, void *v)
  58 {
  59         int i;
  60
  61         for (i = 0; i < __SCHED_FEAT_NR; i++) {
  62                 if (!(sysctl_sched_features & (1UL << i)))
  63                         seq_puts(m, "NO_");
  64                 seq_printf(m, "%s ", sched_feat_names[i]);
  65         }
  66         seq_puts(m, "\n");
  67
  68         return 0;
  69 }
  70
  71 #ifdef CONFIG_JUMP_LABEL
  72
  73 #define jump_label_key__true  STATIC_KEY_INIT_TRUE
  74 #define jump_label_key__false STATIC_KEY_INIT_FALSE
  75
  76 #define SCHED_FEAT(name, enabled)       \
  77         jump_label_key__##enabled ,
  78
  79 struct static_key sched_feat_keys[__SCHED_FEAT_NR] = {
  80 #include "features.h"
  81 };
  82
  83 #undef SCHED_FEAT
  84
  85 static void sched_feat_disable(int i)
  86 {
  87         static_key_disable_cpuslocked(&sched_feat_keys[i]);
  88 }
  89
  90 static void sched_feat_enable(int i)
  91 {
  92         static_key_enable_cpuslocked(&sched_feat_keys[i]);
  93 }
  94 #else
  95 static void sched_feat_disable(int i) { };
  96 static void sched_feat_enable(int i) { };
  97 #endif /* CONFIG_JUMP_LABEL */
  98
  99 static int sched_feat_set(char *cmp)
 100 {
 101         int i;
 102         int neg = 0;
 103
 104         if (strncmp(cmp, "NO_", 3) == 0) {
 105                 neg = 1;
 106                 cmp += 3;
 107         }
 108
 109         i = match_string(sched_feat_names, __SCHED_FEAT_NR, cmp);
 110         if (i < 0)
 111                 return i;
 112
 113         if (neg) {
 114                 sysctl_sched_features &= ~(1UL << i);
 115                 sched_feat_disable(i);
 116         } else {
 117                 sysctl_sched_features |= (1UL << i);
 118                 sched_feat_enable(i);
 119         }
 120
 121         return 0;
 122 }
 123
 124 static ssize_t
 125 sched_feat_write(struct file *filp, const char __user *ubuf,
 126                 size_t cnt, loff_t *ppos)
 127 {
 128         char buf[64];
 129         char *cmp;
 130         int ret;
 131         struct inode *inode;
 132
 133         if (cnt > 63)
 134                 cnt = 63;
 135
 136         if (copy_from_user(&buf, ubuf, cnt))
 137                 return -EFAULT;
 138
 139         buf[cnt] = 0;
 140         cmp = strstrip(buf);
 141
 142         /* Ensure the static_key remains in a consistent state */
 143         inode = file_inode(filp);
 144         cpus_read_lock();
 145         inode_lock(inode);
 146         ret = sched_feat_set(cmp);
 147         inode_unlock(inode);
 148         cpus_read_unlock();
 149         if (ret < 0)
 150                 return ret;
 151
 152         *ppos += cnt;
 153
 154         return cnt;
 155 }
 156
 157 static int sched_feat_open(struct inode *inode, struct file *filp)
 158 {
 159         return single_open(filp, sched_feat_show, NULL);
 160 }
 161
 162 static const struct file_operations sched_feat_fops = {
 163         .open           = sched_feat_open,
 164         .write          = sched_feat_write,
 165         .read           = seq_read,
 166         .llseek         = seq_lseek,
 167         .release        = single_release,
 168 };
 169
 170 #ifdef CONFIG_SMP
 171
 172 static ssize_t sched_scaling_write(struct file *filp, const char __user *ubuf,
 173                                    size_t cnt, loff_t *ppos)
 174 {
 175         char buf[16];
 176         unsigned int scaling;
 177
 178         if (cnt > 15)
 179                 cnt = 15;
 180
 181         if (copy_from_user(&buf, ubuf, cnt))
 182                 return -EFAULT;
 183         buf[cnt] = '\0';
 184
 185         if (kstrtouint(buf, 10, &scaling))
 186                 return -EINVAL;
 187
 188         if (scaling >= SCHED_TUNABLESCALING_END)
 189                 return -EINVAL;
 190
 191         sysctl_sched_tunable_scaling = scaling;
 192         if (sched_update_scaling())
 193                 return -EINVAL;
 194
 195         *ppos += cnt;
 196         return cnt;
 197 }
 198
 199 static int sched_scaling_show(struct seq_file *m, void *v)
 200 {
 201         seq_printf(m, "%d\n", sysctl_sched_tunable_scaling);
 202         return 0;
 203 }
 204
 205 static int sched_scaling_open(struct inode *inode, struct file *filp)
 206 {
 207         return single_open(filp, sched_scaling_show, NULL);
 208 }
 209
 210 static const struct file_operations sched_scaling_fops = {
 211         .open           = sched_scaling_open,
 212         .write          = sched_scaling_write,
 213         .read           = seq_read,
 214         .llseek         = seq_lseek,
 215         .release        = single_release,
 216 };
 217
 218 #endif /* SMP */
 219
 220 #ifdef CONFIG_PREEMPT_DYNAMIC
 221
 222 static ssize_t sched_dynamic_write(struct file *filp, const char __user *ubuf,
 223                                    size_t cnt, loff_t *ppos)
 224 {
 225         char buf[16];
 226         int mode;
 227
 228         if (cnt > 15)
 229                 cnt = 15;
 230
 231         if (copy_from_user(&buf, ubuf, cnt))
 232                 return -EFAULT;
 233
 234         buf[cnt] = 0;
 235         mode = sched_dynamic_mode(strstrip(buf));
 236         if (mode < 0)
 237                 return mode;
 238
 239         sched_dynamic_update(mode);
 240
 241         *ppos += cnt;
 242
 243         return cnt;
 244 }
 245
 246 static int sched_dynamic_show(struct seq_file *m, void *v)
 247 {
 248         static const char * preempt_modes[] = {
 249                 "none", "voluntary", "full"
 250         };
 251         int i;
 252
 253         for (i = 0; i < ARRAY_SIZE(preempt_modes); i++) {
 254                 if (preempt_dynamic_mode == i)
 255                         seq_puts(m, "(");
 256                 seq_puts(m, preempt_modes[i]);
 257                 if (preempt_dynamic_mode == i)
 258                         seq_puts(m, ")");
 259
 260                 seq_puts(m, " ");
 261         }
 262
 263         seq_puts(m, "\n");
 264         return 0;
 265 }
 266
 267 static int sched_dynamic_open(struct inode *inode, struct file *filp)
 268 {
 269         return single_open(filp, sched_dynamic_show, NULL);
 270 }
 271
 272 static const struct file_operations sched_dynamic_fops = {
 273         .open           = sched_dynamic_open,
 274         .write          = sched_dynamic_write,
 275         .read           = seq_read,
 276         .llseek         = seq_lseek,
 277         .release        = single_release,
 278 };
 279
 280 #endif /* CONFIG_PREEMPT_DYNAMIC */
 281
 282 __read_mostly bool sched_debug_verbose;
 283
 284 static const struct seq_operations sched_debug_sops;
 285
 286 static int sched_debug_open(struct inode *inode, struct file *filp)
 287 {
 288         return seq_open(filp, &sched_debug_sops);
 289 }
 290
 291 static const struct file_operations sched_debug_fops = {
 292         .open           = sched_debug_open,
 293         .read           = seq_read,
 294         .llseek         = seq_lseek,
 295         .release        = seq_release,
 296 };
 297
 298 static struct dentry *debugfs_sched;
 299
 300 static __init int sched_init_debug(void)
 301 {
 302         struct dentry __maybe_unused *numa;
 303
 304         debugfs_sched = debugfs_create_dir("sched", NULL);
 305
 306         debugfs_create_file("features", 0644, debugfs_sched, NULL, &sched_feat_fops);
 307         debugfs_create_bool("verbose", 0644, debugfs_sched, &sched_debug_verbose);
 308 #ifdef CONFIG_PREEMPT_DYNAMIC
 309         debugfs_create_file("preempt", 0644, debugfs_sched, NULL, &sched_dynamic_fops);
 310 #endif
 311
 312         debugfs_create_u32("latency_ns", 0644, debugfs_sched, &sysctl_sched_latency);
 313         debugfs_create_u32("min_granularity_ns", 0644, debugfs_sched, &sysctl_sched_min_granularity);
 314         debugfs_create_u32("idle_min_granularity_ns", 0644, debugfs_sched, &sysctl_sched_idle_min_granularity);
 315         debugfs_create_u32("wakeup_granularity_ns", 0644, debugfs_sched, &sysctl_sched_wakeup_granularity);
 316
 317         debugfs_create_u32("latency_warn_ms", 0644, debugfs_sched, &sysctl_resched_latency_warn_ms);
 318         debugfs_create_u32("latency_warn_once", 0644, debugfs_sched, &sysctl_resched_latency_warn_once);
 319
 320 #ifdef CONFIG_SMP
 321         debugfs_create_file("tunable_scaling", 0644, debugfs_sched, NULL, &sched_scaling_fops);
 322         debugfs_create_u32("migration_cost_ns", 0644, debugfs_sched, &sysctl_sched_migration_cost);
 323         debugfs_create_u32("nr_migrate", 0644, debugfs_sched, &sysctl_sched_nr_migrate);
 324
 325         mutex_lock(&sched_domains_mutex);
 326         update_sched_domain_debugfs();
 327         mutex_unlock(&sched_domains_mutex);
 328 #endif
 329
 330 #ifdef CONFIG_NUMA_BALANCING
 331         numa = debugfs_create_dir("numa_balancing", debugfs_sched);
 332
 333         debugfs_create_u32("scan_delay_ms", 0644, numa, &sysctl_numa_balancing_scan_delay);
 334         debugfs_create_u32("scan_period_min_ms", 0644, numa, &sysctl_numa_balancing_scan_period_min);
 335         debugfs_create_u32("scan_period_max_ms", 0644, numa, &sysctl_numa_balancing_scan_period_max);
 336         debugfs_create_u32("scan_size_mb", 0644, numa, &sysctl_numa_balancing_scan_size);
 337 #endif
 338
 339         debugfs_create_file("debug", 0444, debugfs_sched, NULL, &sched_debug_fops);
 340
 341         return 0;
 342 }
 343 late_initcall(sched_init_debug);
 344
 345 #ifdef CONFIG_SMP
 346
 347 static cpumask_var_t            sd_sysctl_cpus;
 348 static struct dentry            *sd_dentry;
 349
 350 static int sd_flags_show(struct seq_file *m, void *v)
 351 {
 352         unsigned long flags = *(unsigned int *)m->private;
 353         int idx;
 354
 355         for_each_set_bit(idx, &flags, __SD_FLAG_CNT) {
 356                 seq_puts(m, sd_flag_debug[idx].name);
 357                 seq_puts(m, " ");
 358         }
 359         seq_puts(m, "\n");
 360
 361         return 0;
 362 }
 363
 364 static int sd_flags_open(struct inode *inode, struct file *file)
 365 {
 366         return single_open(file, sd_flags_show, inode->i_private);
 367 }
 368
 369 static const struct file_operations sd_flags_fops = {
 370         .open           = sd_flags_open,
 371         .read           = seq_read,
 372         .llseek         = seq_lseek,
 373         .release        = single_release,
 374 };
 375
 376 static void register_sd(struct sched_domain *sd, struct dentry *parent)
 377 {
 378 #define SDM(type, mode, member) \
 379         debugfs_create_##type(#member, mode, parent, &sd->member)
 380
 381         SDM(ulong, 0644, min_interval);
 382         SDM(ulong, 0644, max_interval);
 383         SDM(u64,   0644, max_newidle_lb_cost);
 384         SDM(u32,   0644, busy_factor);
 385         SDM(u32,   0644, imbalance_pct);
 386         SDM(u32,   0644, cache_nice_tries);
 387         SDM(str,   0444, name);
 388
 389 #undef SDM
 390
 391         debugfs_create_file("flags", 0444, parent, &sd->flags, &sd_flags_fops);
 392 }
 393
 394 void update_sched_domain_debugfs(void)
 395 {
 396         int cpu, i;
 397
 398         /*
 399          * This can unfortunately be invoked before sched_debug_init() creates
 400          * the debug directory. Don't touch sd_sysctl_cpus until then.
 401          */
 402         if (!debugfs_sched)
 403                 return;
 404
 405         if (!cpumask_available(sd_sysctl_cpus)) {
 406                 if (!alloc_cpumask_var(&sd_sysctl_cpus, GFP_KERNEL))
 407                         return;
 408                 cpumask_copy(sd_sysctl_cpus, cpu_possible_mask);
 409         }
 410
 411         if (!sd_dentry)
 412                 sd_dentry = debugfs_create_dir("domains", debugfs_sched);
 413
 414         for_each_cpu(cpu, sd_sysctl_cpus) {
 415                 struct sched_domain *sd;
 416                 struct dentry *d_cpu;
 417                 char buf[32];
 418
 419                 snprintf(buf, sizeof(buf), "cpu%d", cpu);
 420                 debugfs_remove(debugfs_lookup(buf, sd_dentry));
 421                 d_cpu = debugfs_create_dir(buf, sd_dentry);
 422
 423                 i = 0;
 424                 for_each_domain(cpu, sd) {
 425                         struct dentry *d_sd;
 426
 427                         snprintf(buf, sizeof(buf), "domain%d", i);
 428                         d_sd = debugfs_create_dir(buf, d_cpu);
 429
 430                         register_sd(sd, d_sd);
 431                         i++;
 432                 }
 433
 434                 __cpumask_clear_cpu(cpu, sd_sysctl_cpus);
 435         }
 436 }
 437
 438 void dirty_sched_domain_sysctl(int cpu)
 439 {
 440         if (cpumask_available(sd_sysctl_cpus))
 441                 __cpumask_set_cpu(cpu, sd_sysctl_cpus);
 442 }
 443
 444 #endif /* CONFIG_SMP */
 445
 446 #ifdef CONFIG_FAIR_GROUP_SCHED
 447 static void print_cfs_group_stats(struct seq_file *m, int cpu, struct task_group *tg)
 448 {
 449         struct sched_entity *se = tg->se[cpu];
 450
 451 #define P(F)            SEQ_printf(m, "  .%-30s: %lld\n",       #F, (long long)F)
 452 #define P_SCHEDSTAT(F)  SEQ_printf(m, "  .%-30s: %lld\n",       \
 453                 #F, (long long)schedstat_val(stats->F))
 454 #define PN(F)           SEQ_printf(m, "  .%-30s: %lld.%06ld\n", #F, SPLIT_NS((long long)F))
 455 #define PN_SCHEDSTAT(F) SEQ_printf(m, "  .%-30s: %lld.%06ld\n", \
 456                 #F, SPLIT_NS((long long)schedstat_val(stats->F)))
 457
 458         if (!se)
 459                 return;
 460
 461         PN(se->exec_start);
 462         PN(se->vruntime);
 463         PN(se->sum_exec_runtime);
 464
 465         if (schedstat_enabled()) {
 466                 struct sched_statistics *stats;
 467                 stats = __schedstats_from_se(se);
 468
 469                 PN_SCHEDSTAT(wait_start);
 470                 PN_SCHEDSTAT(sleep_start);
 471                 PN_SCHEDSTAT(block_start);
 472                 PN_SCHEDSTAT(sleep_max);
 473                 PN_SCHEDSTAT(block_max);
 474                 PN_SCHEDSTAT(exec_max);
 475                 PN_SCHEDSTAT(slice_max);
 476                 PN_SCHEDSTAT(wait_max);
 477                 PN_SCHEDSTAT(wait_sum);
 478                 P_SCHEDSTAT(wait_count);
 479         }
 480
 481         P(se->load.weight);
 482 #ifdef CONFIG_SMP
 483         P(se->avg.load_avg);
 484         P(se->avg.util_avg);
 485         P(se->avg.runnable_avg);
 486 #endif
 487
 488 #undef PN_SCHEDSTAT
 489 #undef PN
 490 #undef P_SCHEDSTAT
 491 #undef P
 492 }
 493 #endif
 494
 495 #ifdef CONFIG_CGROUP_SCHED
 496 static DEFINE_SPINLOCK(sched_debug_lock);
 497 static char group_path[PATH_MAX];
 498
 499 static void task_group_path(struct task_group *tg, char *path, int plen)
 500 {
 501         if (autogroup_path(tg, path, plen))
 502                 return;
 503
 504         cgroup_path(tg->css.cgroup, path, plen);
 505 }
 506
 507 /*
 508  * Only 1 SEQ_printf_task_group_path() caller can use the full length
 509  * group_path[] for cgroup path. Other simultaneous callers will have
 510  * to use a shorter stack buffer. A "..." suffix is appended at the end
 511  * of the stack buffer so that it will show up in case the output length
 512  * matches the given buffer size to indicate possible path name truncation.
 513  */
 514 #define SEQ_printf_task_group_path(m, tg, fmt...)                       \
 515 {                                                                       \
 516         if (spin_trylock(&sched_debug_lock)) {                          \
 517                 task_group_path(tg, group_path, sizeof(group_path));    \
 518                 SEQ_printf(m, fmt, group_path);                         \
 519                 spin_unlock(&sched_debug_lock);                         \
 520         } else {                                                        \
 521                 char buf[128];                                          \
 522                 char *bufend = buf + sizeof(buf) - 3;                   \
 523                 task_group_path(tg, buf, bufend - buf);                 \
 524                 strcpy(bufend - 1, "...");                              \
 525                 SEQ_printf(m, fmt, buf);                                \
 526         }                                                               \
 527 }
 528 #endif
 529
 530 static void
 531 print_task(struct seq_file *m, struct rq *rq, struct task_struct *p)
 532 {
 533         if (task_current(rq, p))
 534                 SEQ_printf(m, ">R");
 535         else
 536                 SEQ_printf(m, " %c", task_state_to_char(p));
 537
 538         SEQ_printf(m, " %15s %5d %9Ld.%06ld %9Ld %5d ",
 539                 p->comm, task_pid_nr(p),
 540                 SPLIT_NS(p->se.vruntime),
 541                 (long long)(p->nvcsw + p->nivcsw),
 542                 p->prio);
 543
 544         SEQ_printf(m, "%9lld.%06ld %9lld.%06ld %9lld.%06ld %9lld.%06ld",
 545                 SPLIT_NS(schedstat_val_or_zero(p->stats.wait_sum)),
 546                 SPLIT_NS(p->se.sum_exec_runtime),
 547                 SPLIT_NS(schedstat_val_or_zero(p->stats.sum_sleep_runtime)),
 548                 SPLIT_NS(schedstat_val_or_zero(p->stats.sum_block_runtime)));
 549
 550 #ifdef CONFIG_NUMA_BALANCING
 551         SEQ_printf(m, " %d %d", task_node(p), task_numa_group_id(p));
 552 #endif
 553 #ifdef CONFIG_CGROUP_SCHED
 554         SEQ_printf_task_group_path(m, task_group(p), " %s")
 555 #endif
 556
 557         SEQ_printf(m, "\n");
 558 }
 559
 560 static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu)
 561 {
 562         struct task_struct *g, *p;
 563
 564         SEQ_printf(m, "\n");
 565         SEQ_printf(m, "runnable tasks:\n");
 566         SEQ_printf(m, " S            task   PID         tree-key  switches  prio"
 567                    "     wait-time             sum-exec        sum-sleep\n");
 568         SEQ_printf(m, "-------------------------------------------------------"
 569                    "------------------------------------------------------\n");
 570
 571         rcu_read_lock();
 572         for_each_process_thread(g, p) {
 573                 if (task_cpu(p) != rq_cpu)
 574                         continue;
 575
 576                 print_task(m, rq, p);
 577         }
 578         rcu_read_unlock();
 579 }
 580
 581 void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
 582 {
 583         s64 MIN_vruntime = -1, min_vruntime, max_vruntime = -1,
 584                 spread, rq0_min_vruntime, spread0;
 585         struct rq *rq = cpu_rq(cpu);
 586         struct sched_entity *last;
 587         unsigned long flags;
 588
 589 #ifdef CONFIG_FAIR_GROUP_SCHED
 590         SEQ_printf(m, "\n");
 591         SEQ_printf_task_group_path(m, cfs_rq->tg, "cfs_rq[%d]:%s\n", cpu);
 592 #else
 593         SEQ_printf(m, "\n");
 594         SEQ_printf(m, "cfs_rq[%d]:\n", cpu);
 595 #endif
 596         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", "exec_clock",
 597                         SPLIT_NS(cfs_rq->exec_clock));
 598
 599         raw_spin_rq_lock_irqsave(rq, flags);
 600         if (rb_first_cached(&cfs_rq->tasks_timeline))
 601                 MIN_vruntime = (__pick_first_entity(cfs_rq))->vruntime;
 602         last = __pick_last_entity(cfs_rq);
 603         if (last)
 604                 max_vruntime = last->vruntime;
 605         min_vruntime = cfs_rq->min_vruntime;
 606         rq0_min_vruntime = cpu_rq(0)->cfs.min_vruntime;
 607         raw_spin_rq_unlock_irqrestore(rq, flags);
 608         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", "MIN_vruntime",
 609                         SPLIT_NS(MIN_vruntime));
 610         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", "min_vruntime",
 611                         SPLIT_NS(min_vruntime));
 612         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", "max_vruntime",
 613                         SPLIT_NS(max_vruntime));
 614         spread = max_vruntime - MIN_vruntime;
 615         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", "spread",
 616                         SPLIT_NS(spread));
 617         spread0 = min_vruntime - rq0_min_vruntime;
 618         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", "spread0",
 619                         SPLIT_NS(spread0));
 620         SEQ_printf(m, "  .%-30s: %d\n", "nr_spread_over",
 621                         cfs_rq->nr_spread_over);
 622         SEQ_printf(m, "  .%-30s: %d\n", "nr_running", cfs_rq->nr_running);
 623         SEQ_printf(m, "  .%-30s: %d\n", "h_nr_running", cfs_rq->h_nr_running);
 624         SEQ_printf(m, "  .%-30s: %d\n", "idle_nr_running",
 625                         cfs_rq->idle_nr_running);
 626         SEQ_printf(m, "  .%-30s: %d\n", "idle_h_nr_running",
 627                         cfs_rq->idle_h_nr_running);
 628         SEQ_printf(m, "  .%-30s: %ld\n", "load", cfs_rq->load.weight);
 629 #ifdef CONFIG_SMP
 630         SEQ_printf(m, "  .%-30s: %lu\n", "load_avg",
 631                         cfs_rq->avg.load_avg);
 632         SEQ_printf(m, "  .%-30s: %lu\n", "runnable_avg",
 633                         cfs_rq->avg.runnable_avg);
 634         SEQ_printf(m, "  .%-30s: %lu\n", "util_avg",
 635                         cfs_rq->avg.util_avg);
 636         SEQ_printf(m, "  .%-30s: %u\n", "util_est_enqueued",
 637                         cfs_rq->avg.util_est.enqueued);
 638         SEQ_printf(m, "  .%-30s: %ld\n", "removed.load_avg",
 639                         cfs_rq->removed.load_avg);
 640         SEQ_printf(m, "  .%-30s: %ld\n", "removed.util_avg",
 641                         cfs_rq->removed.util_avg);
 642         SEQ_printf(m, "  .%-30s: %ld\n", "removed.runnable_avg",
 643                         cfs_rq->removed.runnable_avg);
 644 #ifdef CONFIG_FAIR_GROUP_SCHED
 645         SEQ_printf(m, "  .%-30s: %lu\n", "tg_load_avg_contrib",
 646                         cfs_rq->tg_load_avg_contrib);
 647         SEQ_printf(m, "  .%-30s: %ld\n", "tg_load_avg",
 648                         atomic_long_read(&cfs_rq->tg->load_avg));
 649 #endif
 650 #endif
 651 #ifdef CONFIG_CFS_BANDWIDTH
 652         SEQ_printf(m, "  .%-30s: %d\n", "throttled",
 653                         cfs_rq->throttled);
 654         SEQ_printf(m, "  .%-30s: %d\n", "throttle_count",
 655                         cfs_rq->throttle_count);
 656 #endif
 657
 658 #ifdef CONFIG_FAIR_GROUP_SCHED
 659         print_cfs_group_stats(m, cpu, cfs_rq->tg);
 660 #endif
 661 }
 662
 663 void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq)
 664 {
 665 #ifdef CONFIG_RT_GROUP_SCHED
 666         SEQ_printf(m, "\n");
 667         SEQ_printf_task_group_path(m, rt_rq->tg, "rt_rq[%d]:%s\n", cpu);
 668 #else
 669         SEQ_printf(m, "\n");
 670         SEQ_printf(m, "rt_rq[%d]:\n", cpu);
 671 #endif
 672
 673 #define P(x) \
 674         SEQ_printf(m, "  .%-30s: %Ld\n", #x, (long long)(rt_rq->x))
 675 #define PU(x) \
 676         SEQ_printf(m, "  .%-30s: %lu\n", #x, (unsigned long)(rt_rq->x))
 677 #define PN(x) \
 678         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rt_rq->x))
 679
 680         PU(rt_nr_running);
 681 #ifdef CONFIG_SMP
 682         PU(rt_nr_migratory);
 683 #endif
 684         P(rt_throttled);
 685         PN(rt_time);
 686         PN(rt_runtime);
 687
 688 #undef PN
 689 #undef PU
 690 #undef P
 691 }
 692
 693 void print_dl_rq(struct seq_file *m, int cpu, struct dl_rq *dl_rq)
 694 {
 695         struct dl_bw *dl_bw;
 696
 697         SEQ_printf(m, "\n");
 698         SEQ_printf(m, "dl_rq[%d]:\n", cpu);
 699
 700 #define PU(x) \
 701         SEQ_printf(m, "  .%-30s: %lu\n", #x, (unsigned long)(dl_rq->x))
 702
 703         PU(dl_nr_running);
 704 #ifdef CONFIG_SMP
 705         PU(dl_nr_migratory);
 706         dl_bw = &cpu_rq(cpu)->rd->dl_bw;
 707 #else
 708         dl_bw = &dl_rq->dl_bw;
 709 #endif
 710         SEQ_printf(m, "  .%-30s: %lld\n", "dl_bw->bw", dl_bw->bw);
 711         SEQ_printf(m, "  .%-30s: %lld\n", "dl_bw->total_bw", dl_bw->total_bw);
 712
 713 #undef PU
 714 }
 715
 716 static void print_cpu(struct seq_file *m, int cpu)
 717 {
 718         struct rq *rq = cpu_rq(cpu);
 719
 720 #ifdef CONFIG_X86
 721         {
 722                 unsigned int freq = cpu_khz ? : 1;
 723
 724                 SEQ_printf(m, "cpu#%d, %u.%03u MHz\n",
 725                            cpu, freq / 1000, (freq % 1000));
 726         }
 727 #else
 728         SEQ_printf(m, "cpu#%d\n", cpu);
 729 #endif
 730
 731 #define P(x)                                                            \
 732 do {                                                                    \
 733         if (sizeof(rq->x) == 4)                                         \
 734                 SEQ_printf(m, "  .%-30s: %ld\n", #x, (long)(rq->x));    \
 735         else                                                            \
 736                 SEQ_printf(m, "  .%-30s: %Ld\n", #x, (long long)(rq->x));\
 737 } while (0)
 738
 739 #define PN(x) \
 740         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rq->x))
 741
 742         P(nr_running);
 743         P(nr_switches);
 744         P(nr_uninterruptible);
 745         PN(next_balance);
 746         SEQ_printf(m, "  .%-30s: %ld\n", "curr->pid", (long)(task_pid_nr(rq->curr)));
 747         PN(clock);
 748         PN(clock_task);
 749 #undef P
 750 #undef PN
 751
 752 #ifdef CONFIG_SMP
 753 #define P64(n) SEQ_printf(m, "  .%-30s: %Ld\n", #n, rq->n);
 754         P64(avg_idle);
 755         P64(max_idle_balance_cost);
 756 #undef P64
 757 #endif
 758
 759 #define P(n) SEQ_printf(m, "  .%-30s: %d\n", #n, schedstat_val(rq->n));
 760         if (schedstat_enabled()) {
 761                 P(yld_count);
 762                 P(sched_count);
 763                 P(sched_goidle);
 764                 P(ttwu_count);
 765                 P(ttwu_local);
 766         }
 767 #undef P
 768
 769         print_cfs_stats(m, cpu);
 770         print_rt_stats(m, cpu);
 771         print_dl_stats(m, cpu);
 772
 773         print_rq(m, rq, cpu);
 774         SEQ_printf(m, "\n");
 775 }
 776
 777 static const char *sched_tunable_scaling_names[] = {
 778         "none",
 779         "logarithmic",
 780         "linear"
 781 };
 782
 783 static void sched_debug_header(struct seq_file *m)
 784 {
 785         u64 ktime, sched_clk, cpu_clk;
 786         unsigned long flags;
 787
 788         local_irq_save(flags);
 789         ktime = ktime_to_ns(ktime_get());
 790         sched_clk = sched_clock();
 791         cpu_clk = local_clock();
 792         local_irq_restore(flags);
 793
 794         SEQ_printf(m, "Sched Debug Version: v0.11, %s %.*s\n",
 795                 init_utsname()->release,
 796                 (int)strcspn(init_utsname()->version, " "),
 797                 init_utsname()->version);
 798
 799 #define P(x) \
 800         SEQ_printf(m, "%-40s: %Ld\n", #x, (long long)(x))
 801 #define PN(x) \
 802         SEQ_printf(m, "%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x))
 803         PN(ktime);
 804         PN(sched_clk);
 805         PN(cpu_clk);
 806         P(jiffies);
 807 #ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
 808         P(sched_clock_stable());
 809 #endif
 810 #undef PN
 811 #undef P
 812
 813         SEQ_printf(m, "\n");
 814         SEQ_printf(m, "sysctl_sched\n");
 815
 816 #define P(x) \
 817         SEQ_printf(m, "  .%-40s: %Ld\n", #x, (long long)(x))
 818 #define PN(x) \
 819         SEQ_printf(m, "  .%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x))
 820         PN(sysctl_sched_latency);
 821         PN(sysctl_sched_min_granularity);
 822         PN(sysctl_sched_idle_min_granularity);
 823         PN(sysctl_sched_wakeup_granularity);
 824         P(sysctl_sched_child_runs_first);
 825         P(sysctl_sched_features);
 826 #undef PN
 827 #undef P
 828
 829         SEQ_printf(m, "  .%-40s: %d (%s)\n",
 830                 "sysctl_sched_tunable_scaling",
 831                 sysctl_sched_tunable_scaling,
 832                 sched_tunable_scaling_names[sysctl_sched_tunable_scaling]);
 833         SEQ_printf(m, "\n");
 834 }
 835
 836 static int sched_debug_show(struct seq_file *m, void *v)
 837 {
 838         int cpu = (unsigned long)(v - 2);
 839
 840         if (cpu != -1)
 841                 print_cpu(m, cpu);
 842         else
 843                 sched_debug_header(m);
 844
 845         return 0;
 846 }
 847
 848 void sysrq_sched_debug_show(void)
 849 {
 850         int cpu;
 851
 852         sched_debug_header(NULL);
 853         for_each_online_cpu(cpu) {
 854                 /*
 855                  * Need to reset softlockup watchdogs on all CPUs, because
 856                  * another CPU might be blocked waiting for us to process
 857                  * an IPI or stop_machine.
 858                  */
 859                 touch_nmi_watchdog();
 860                 touch_all_softlockup_watchdogs();
 861                 print_cpu(NULL, cpu);
 862         }
 863 }
 864
 865 /*
 866  * This iterator needs some explanation.
 867  * It returns 1 for the header position.
 868  * This means 2 is CPU 0.
 869  * In a hotplugged system some CPUs, including CPU 0, may be missing so we have
 870  * to use cpumask_* to iterate over the CPUs.
 871  */
 872 static void *sched_debug_start(struct seq_file *file, loff_t *offset)
 873 {
 874         unsigned long n = *offset;
 875
 876         if (n == 0)
 877                 return (void *) 1;
 878
 879         n--;
 880
 881         if (n > 0)
 882                 n = cpumask_next(n - 1, cpu_online_mask);
 883         else
 884                 n = cpumask_first(cpu_online_mask);
 885
 886         *offset = n + 1;
 887
 888         if (n < nr_cpu_ids)
 889                 return (void *)(unsigned long)(n + 2);
 890
 891         return NULL;
 892 }
 893
 894 static void *sched_debug_next(struct seq_file *file, void *data, loff_t *offset)
 895 {
 896         (*offset)++;
 897         return sched_debug_start(file, offset);
 898 }
 899
 900 static void sched_debug_stop(struct seq_file *file, void *data)
 901 {
 902 }
 903
 904 static const struct seq_operations sched_debug_sops = {
 905         .start          = sched_debug_start,
 906         .next           = sched_debug_next,
 907         .stop           = sched_debug_stop,
 908         .show           = sched_debug_show,
 909 };
 910
 911 #define __PS(S, F) SEQ_printf(m, "%-45s:%21Ld\n", S, (long long)(F))
 912 #define __P(F) __PS(#F, F)
 913 #define   P(F) __PS(#F, p->F)
 914 #define   PM(F, M) __PS(#F, p->F & (M))
 915 #define __PSN(S, F) SEQ_printf(m, "%-45s:%14Ld.%06ld\n", S, SPLIT_NS((long long)(F)))
 916 #define __PN(F) __PSN(#F, F)
 917 #define   PN(F) __PSN(#F, p->F)
 918
 919
 920 #ifdef CONFIG_NUMA_BALANCING
 921 void print_numa_stats(struct seq_file *m, int node, unsigned long tsf,
 922                 unsigned long tpf, unsigned long gsf, unsigned long gpf)
 923 {
 924         SEQ_printf(m, "numa_faults node=%d ", node);
 925         SEQ_printf(m, "task_private=%lu task_shared=%lu ", tpf, tsf);
 926         SEQ_printf(m, "group_private=%lu group_shared=%lu\n", gpf, gsf);
 927 }
 928 #endif
 929
 930
 931 static void sched_show_numa(struct task_struct *p, struct seq_file *m)
 932 {
 933 #ifdef CONFIG_NUMA_BALANCING
 934         struct mempolicy *pol;
 935
 936         if (p->mm)
 937                 P(mm->numa_scan_seq);
 938
 939         task_lock(p);
 940         pol = p->mempolicy;
 941         if (pol && !(pol->flags & MPOL_F_MORON))
 942                 pol = NULL;
 943         mpol_get(pol);
 944         task_unlock(p);
 945
 946         P(numa_pages_migrated);
 947         P(numa_preferred_nid);
 948         P(total_numa_faults);
 949         SEQ_printf(m, "current_node=%d, numa_group_id=%d\n",
 950                         task_node(p), task_numa_group_id(p));
 951         show_numa_stats(p, m);
 952         mpol_put(pol);
 953 #endif
 954 }
 955
 956 void proc_sched_show_task(struct task_struct *p, struct pid_namespace *ns,
 957                                                   struct seq_file *m)
 958 {
 959         unsigned long nr_switches;
 960
 961         SEQ_printf(m, "%s (%d, #threads: %d)\n", p->comm, task_pid_nr_ns(p, ns),
 962                                                 get_nr_threads(p));
 963         SEQ_printf(m,
 964                 "---------------------------------------------------------"
 965                 "----------\n");
 966
 967 #define P_SCHEDSTAT(F)  __PS(#F, schedstat_val(p->stats.F))
 968 #define PN_SCHEDSTAT(F) __PSN(#F, schedstat_val(p->stats.F))
 969
 970         PN(se.exec_start);
 971         PN(se.vruntime);
 972         PN(se.sum_exec_runtime);
 973
 974         nr_switches = p->nvcsw + p->nivcsw;
 975
 976         P(se.nr_migrations);
 977
 978         if (schedstat_enabled()) {
 979                 u64 avg_atom, avg_per_cpu;
 980
 981                 PN_SCHEDSTAT(sum_sleep_runtime);
 982                 PN_SCHEDSTAT(sum_block_runtime);
 983                 PN_SCHEDSTAT(wait_start);
 984                 PN_SCHEDSTAT(sleep_start);
 985                 PN_SCHEDSTAT(block_start);
 986                 PN_SCHEDSTAT(sleep_max);
 987                 PN_SCHEDSTAT(block_max);
 988                 PN_SCHEDSTAT(exec_max);
 989                 PN_SCHEDSTAT(slice_max);
 990                 PN_SCHEDSTAT(wait_max);
 991                 PN_SCHEDSTAT(wait_sum);
 992                 P_SCHEDSTAT(wait_count);
 993                 PN_SCHEDSTAT(iowait_sum);
 994                 P_SCHEDSTAT(iowait_count);
 995                 P_SCHEDSTAT(nr_migrations_cold);
 996                 P_SCHEDSTAT(nr_failed_migrations_affine);
 997                 P_SCHEDSTAT(nr_failed_migrations_running);
 998                 P_SCHEDSTAT(nr_failed_migrations_hot);
 999                 P_SCHEDSTAT(nr_forced_migrations);
1000                 P_SCHEDSTAT(nr_wakeups);
1001                 P_SCHEDSTAT(nr_wakeups_sync);
1002                 P_SCHEDSTAT(nr_wakeups_migrate);
1003                 P_SCHEDSTAT(nr_wakeups_local);
1004                 P_SCHEDSTAT(nr_wakeups_remote);
1005                 P_SCHEDSTAT(nr_wakeups_affine);
1006                 P_SCHEDSTAT(nr_wakeups_affine_attempts);
1007                 P_SCHEDSTAT(nr_wakeups_passive);
1008                 P_SCHEDSTAT(nr_wakeups_idle);
1009
1010                 avg_atom = p->se.sum_exec_runtime;
1011                 if (nr_switches)
1012                         avg_atom = div64_ul(avg_atom, nr_switches);
1013                 else
1014                         avg_atom = -1LL;
1015
1016                 avg_per_cpu = p->se.sum_exec_runtime;
1017                 if (p->se.nr_migrations) {
1018                         avg_per_cpu = div64_u64(avg_per_cpu,
1019                                                 p->se.nr_migrations);
1020                 } else {
1021                         avg_per_cpu = -1LL;
1022                 }
1023
1024                 __PN(avg_atom);
1025                 __PN(avg_per_cpu);
1026
1027 #ifdef CONFIG_SCHED_CORE
1028                 PN_SCHEDSTAT(core_forceidle_sum);
1029 #endif
1030         }
1031
1032         __P(nr_switches);
1033         __PS("nr_voluntary_switches", p->nvcsw);
1034         __PS("nr_involuntary_switches", p->nivcsw);
1035
1036         P(se.load.weight);
1037 #ifdef CONFIG_SMP
1038         P(se.avg.load_sum);
1039         P(se.avg.runnable_sum);
1040         P(se.avg.util_sum);
1041         P(se.avg.load_avg);
1042         P(se.avg.runnable_avg);
1043         P(se.avg.util_avg);
1044         P(se.avg.last_update_time);
1045         P(se.avg.util_est.ewma);
1046         PM(se.avg.util_est.enqueued, ~UTIL_AVG_UNCHANGED);
1047 #endif
1048 #ifdef CONFIG_UCLAMP_TASK
1049         __PS("uclamp.min", p->uclamp_req[UCLAMP_MIN].value);
1050         __PS("uclamp.max", p->uclamp_req[UCLAMP_MAX].value);
1051         __PS("effective uclamp.min", uclamp_eff_value(p, UCLAMP_MIN));
1052         __PS("effective uclamp.max", uclamp_eff_value(p, UCLAMP_MAX));
1053 #endif
1054         P(policy);
1055         P(prio);
1056         if (task_has_dl_policy(p)) {
1057                 P(dl.runtime);
1058                 P(dl.deadline);
1059         }
1060 #undef PN_SCHEDSTAT
1061 #undef P_SCHEDSTAT
1062
1063         {
1064                 unsigned int this_cpu = raw_smp_processor_id();
1065                 u64 t0, t1;
1066
1067                 t0 = cpu_clock(this_cpu);
1068                 t1 = cpu_clock(this_cpu);
1069                 __PS("clock-delta", t1-t0);
1070         }
1071
1072         sched_show_numa(p, m);
1073 }
1074
1075 void proc_sched_set_task(struct task_struct *p)
1076 {
1077 #ifdef CONFIG_SCHEDSTATS
1078         memset(&p->stats, 0, sizeof(p->stats));
1079 #endif
1080 }
1081
1082 void resched_latency_warn(int cpu, u64 latency)
1083 {
1084         static DEFINE_RATELIMIT_STATE(latency_check_ratelimit, 60 * 60 * HZ, 1);
1085
1086         WARN(__ratelimit(&latency_check_ratelimit),
1087              "sched: CPU %d need_resched set for > %llu ns (%d ticks) "
1088              "without schedule\n",
1089              cpu, latency, cpu_rq(cpu)->ticks_without_resched);
1090 }