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