1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * kernel/sched/debug.c 4 * 5 * Print the CFS rbtree and other debugging details 6 * 7 * Copyright(C) 2007, Red Hat, Inc., Ingo Molnar 8 */ 9 10 /* 11 * This allows printing both to /sys/kernel/debug/sched/debug and 12 * to the console 13 */ 14 #define SEQ_printf(m, x...) \ 15 do { \ 16 if (m) \ 17 seq_printf(m, x); \ 18 else \ 19 pr_cont(x); \ 20 } while (0) 21 22 /* 23 * Ease the printing of nsec fields: 24 */ 25 static long long nsec_high(unsigned long long nsec) 26 { 27 if ((long long)nsec < 0) { 28 nsec = -nsec; 29 do_div(nsec, 1000000); 30 return -nsec; 31 } 32 do_div(nsec, 1000000); 33 34 return nsec; 35 } 36 37 static unsigned long nsec_low(unsigned long long nsec) 38 { 39 if ((long long)nsec < 0) 40 nsec = -nsec; 41 42 return do_div(nsec, 1000000); 43 } 44 45 #define SPLIT_NS(x) nsec_high(x), nsec_low(x) 46 47 #define SCHED_FEAT(name, enabled) \ 48 #name , 49 50 static const char * const sched_feat_names[] = { 51 #include "features.h" 52 }; 53 54 #undef SCHED_FEAT 55 56 static int sched_feat_show(struct seq_file *m, void *v) 57 { 58 int i; 59 60 for (i = 0; i < __SCHED_FEAT_NR; i++) { 61 if (!(sysctl_sched_features & (1UL << i))) 62 seq_puts(m, "NO_"); 63 seq_printf(m, "%s ", sched_feat_names[i]); 64 } 65 seq_puts(m, "\n"); 66 67 return 0; 68 } 69 70 #ifdef CONFIG_JUMP_LABEL 71 72 #define jump_label_key__true STATIC_KEY_INIT_TRUE 73 #define jump_label_key__false STATIC_KEY_INIT_FALSE 74 75 #define SCHED_FEAT(name, enabled) \ 76 jump_label_key__##enabled , 77 78 struct static_key sched_feat_keys[__SCHED_FEAT_NR] = { 79 #include "features.h" 80 }; 81 82 #undef SCHED_FEAT 83 84 static void sched_feat_disable(int i) 85 { 86 static_key_disable_cpuslocked(&sched_feat_keys[i]); 87 } 88 89 static void sched_feat_enable(int i) 90 { 91 static_key_enable_cpuslocked(&sched_feat_keys[i]); 92 } 93 #else 94 static void sched_feat_disable(int i) { }; 95 static void sched_feat_enable(int i) { }; 96 #endif /* CONFIG_JUMP_LABEL */ 97 98 static int sched_feat_set(char *cmp) 99 { 100 int i; 101 int neg = 0; 102 103 if (strncmp(cmp, "NO_", 3) == 0) { 104 neg = 1; 105 cmp += 3; 106 } 107 108 i = match_string(sched_feat_names, __SCHED_FEAT_NR, cmp); 109 if (i < 0) 110 return i; 111 112 if (neg) { 113 sysctl_sched_features &= ~(1UL << i); 114 sched_feat_disable(i); 115 } else { 116 sysctl_sched_features |= (1UL << i); 117 sched_feat_enable(i); 118 } 119 120 return 0; 121 } 122 123 static ssize_t 124 sched_feat_write(struct file *filp, const char __user *ubuf, 125 size_t cnt, loff_t *ppos) 126 { 127 char buf[64]; 128 char *cmp; 129 int ret; 130 struct inode *inode; 131 132 if (cnt > 63) 133 cnt = 63; 134 135 if (copy_from_user(&buf, ubuf, cnt)) 136 return -EFAULT; 137 138 buf[cnt] = 0; 139 cmp = strstrip(buf); 140 141 /* Ensure the static_key remains in a consistent state */ 142 inode = file_inode(filp); 143 cpus_read_lock(); 144 inode_lock(inode); 145 ret = sched_feat_set(cmp); 146 inode_unlock(inode); 147 cpus_read_unlock(); 148 if (ret < 0) 149 return ret; 150 151 *ppos += cnt; 152 153 return cnt; 154 } 155 156 static int sched_feat_open(struct inode *inode, struct file *filp) 157 { 158 return single_open(filp, sched_feat_show, NULL); 159 } 160 161 static const struct file_operations sched_feat_fops = { 162 .open = sched_feat_open, 163 .write = sched_feat_write, 164 .read = seq_read, 165 .llseek = seq_lseek, 166 .release = single_release, 167 }; 168 169 #ifdef CONFIG_SMP 170 171 static ssize_t sched_scaling_write(struct file *filp, const char __user *ubuf, 172 size_t cnt, loff_t *ppos) 173 { 174 char buf[16]; 175 unsigned int scaling; 176 177 if (cnt > 15) 178 cnt = 15; 179 180 if (copy_from_user(&buf, ubuf, cnt)) 181 return -EFAULT; 182 buf[cnt] = '\0'; 183 184 if (kstrtouint(buf, 10, &scaling)) 185 return -EINVAL; 186 187 if (scaling >= SCHED_TUNABLESCALING_END) 188 return -EINVAL; 189 190 sysctl_sched_tunable_scaling = scaling; 191 if (sched_update_scaling()) 192 return -EINVAL; 193 194 *ppos += cnt; 195 return cnt; 196 } 197 198 static int sched_scaling_show(struct seq_file *m, void *v) 199 { 200 seq_printf(m, "%d\n", sysctl_sched_tunable_scaling); 201 return 0; 202 } 203 204 static int sched_scaling_open(struct inode *inode, struct file *filp) 205 { 206 return single_open(filp, sched_scaling_show, NULL); 207 } 208 209 static const struct file_operations sched_scaling_fops = { 210 .open = sched_scaling_open, 211 .write = sched_scaling_write, 212 .read = seq_read, 213 .llseek = seq_lseek, 214 .release = single_release, 215 }; 216 217 #endif /* SMP */ 218 219 #ifdef CONFIG_PREEMPT_DYNAMIC 220 221 static ssize_t sched_dynamic_write(struct file *filp, const char __user *ubuf, 222 size_t cnt, loff_t *ppos) 223 { 224 char buf[16]; 225 int mode; 226 227 if (cnt > 15) 228 cnt = 15; 229 230 if (copy_from_user(&buf, ubuf, cnt)) 231 return -EFAULT; 232 233 buf[cnt] = 0; 234 mode = sched_dynamic_mode(strstrip(buf)); 235 if (mode < 0) 236 return mode; 237 238 sched_dynamic_update(mode); 239 240 *ppos += cnt; 241 242 return cnt; 243 } 244 245 static int sched_dynamic_show(struct seq_file *m, void *v) 246 { 247 int i = IS_ENABLED(CONFIG_PREEMPT_RT) * 2; 248 int j; 249 250 /* Count entries in NULL terminated preempt_modes */ 251 for (j = 0; preempt_modes[j]; j++) 252 ; 253 j -= !IS_ENABLED(CONFIG_ARCH_HAS_PREEMPT_LAZY); 254 255 for (; i < j; i++) { 256 if (preempt_dynamic_mode == i) 257 seq_puts(m, "("); 258 seq_puts(m, preempt_modes[i]); 259 if (preempt_dynamic_mode == i) 260 seq_puts(m, ")"); 261 262 seq_puts(m, " "); 263 } 264 265 seq_puts(m, "\n"); 266 return 0; 267 } 268 269 static int sched_dynamic_open(struct inode *inode, struct file *filp) 270 { 271 return single_open(filp, sched_dynamic_show, NULL); 272 } 273 274 static const struct file_operations sched_dynamic_fops = { 275 .open = sched_dynamic_open, 276 .write = sched_dynamic_write, 277 .read = seq_read, 278 .llseek = seq_lseek, 279 .release = single_release, 280 }; 281 282 #endif /* CONFIG_PREEMPT_DYNAMIC */ 283 284 __read_mostly bool sched_debug_verbose; 285 286 #ifdef CONFIG_SMP 287 static struct dentry *sd_dentry; 288 289 290 static ssize_t sched_verbose_write(struct file *filp, const char __user *ubuf, 291 size_t cnt, loff_t *ppos) 292 { 293 ssize_t result; 294 bool orig; 295 296 cpus_read_lock(); 297 sched_domains_mutex_lock(); 298 299 orig = sched_debug_verbose; 300 result = debugfs_write_file_bool(filp, ubuf, cnt, ppos); 301 302 if (sched_debug_verbose && !orig) 303 update_sched_domain_debugfs(); 304 else if (!sched_debug_verbose && orig) { 305 debugfs_remove(sd_dentry); 306 sd_dentry = NULL; 307 } 308 309 sched_domains_mutex_unlock(); 310 cpus_read_unlock(); 311 312 return result; 313 } 314 #else 315 #define sched_verbose_write debugfs_write_file_bool 316 #endif 317 318 static const struct file_operations sched_verbose_fops = { 319 .read = debugfs_read_file_bool, 320 .write = sched_verbose_write, 321 .open = simple_open, 322 .llseek = default_llseek, 323 }; 324 325 static const struct seq_operations sched_debug_sops; 326 327 static int sched_debug_open(struct inode *inode, struct file *filp) 328 { 329 return seq_open(filp, &sched_debug_sops); 330 } 331 332 static const struct file_operations sched_debug_fops = { 333 .open = sched_debug_open, 334 .read = seq_read, 335 .llseek = seq_lseek, 336 .release = seq_release, 337 }; 338 339 enum dl_param { 340 DL_RUNTIME = 0, 341 DL_PERIOD, 342 }; 343 344 static unsigned long fair_server_period_max = (1UL << 22) * NSEC_PER_USEC; /* ~4 seconds */ 345 static unsigned long fair_server_period_min = (100) * NSEC_PER_USEC; /* 100 us */ 346 347 static ssize_t sched_fair_server_write(struct file *filp, const char __user *ubuf, 348 size_t cnt, loff_t *ppos, enum dl_param param) 349 { 350 long cpu = (long) ((struct seq_file *) filp->private_data)->private; 351 struct rq *rq = cpu_rq(cpu); 352 u64 runtime, period; 353 size_t err; 354 int retval; 355 u64 value; 356 357 err = kstrtoull_from_user(ubuf, cnt, 10, &value); 358 if (err) 359 return err; 360 361 scoped_guard (rq_lock_irqsave, rq) { 362 runtime = rq->fair_server.dl_runtime; 363 period = rq->fair_server.dl_period; 364 365 switch (param) { 366 case DL_RUNTIME: 367 if (runtime == value) 368 break; 369 runtime = value; 370 break; 371 case DL_PERIOD: 372 if (value == period) 373 break; 374 period = value; 375 break; 376 } 377 378 if (runtime > period || 379 period > fair_server_period_max || 380 period < fair_server_period_min) { 381 return -EINVAL; 382 } 383 384 if (rq->cfs.h_nr_queued) { 385 update_rq_clock(rq); 386 dl_server_stop(&rq->fair_server); 387 } 388 389 retval = dl_server_apply_params(&rq->fair_server, runtime, period, 0); 390 if (retval) 391 cnt = retval; 392 393 if (!runtime) 394 printk_deferred("Fair server disabled in CPU %d, system may crash due to starvation.\n", 395 cpu_of(rq)); 396 397 if (rq->cfs.h_nr_queued) 398 dl_server_start(&rq->fair_server); 399 } 400 401 *ppos += cnt; 402 return cnt; 403 } 404 405 static size_t sched_fair_server_show(struct seq_file *m, void *v, enum dl_param param) 406 { 407 unsigned long cpu = (unsigned long) m->private; 408 struct rq *rq = cpu_rq(cpu); 409 u64 value; 410 411 switch (param) { 412 case DL_RUNTIME: 413 value = rq->fair_server.dl_runtime; 414 break; 415 case DL_PERIOD: 416 value = rq->fair_server.dl_period; 417 break; 418 } 419 420 seq_printf(m, "%llu\n", value); 421 return 0; 422 423 } 424 425 static ssize_t 426 sched_fair_server_runtime_write(struct file *filp, const char __user *ubuf, 427 size_t cnt, loff_t *ppos) 428 { 429 return sched_fair_server_write(filp, ubuf, cnt, ppos, DL_RUNTIME); 430 } 431 432 static int sched_fair_server_runtime_show(struct seq_file *m, void *v) 433 { 434 return sched_fair_server_show(m, v, DL_RUNTIME); 435 } 436 437 static int sched_fair_server_runtime_open(struct inode *inode, struct file *filp) 438 { 439 return single_open(filp, sched_fair_server_runtime_show, inode->i_private); 440 } 441 442 static const struct file_operations fair_server_runtime_fops = { 443 .open = sched_fair_server_runtime_open, 444 .write = sched_fair_server_runtime_write, 445 .read = seq_read, 446 .llseek = seq_lseek, 447 .release = single_release, 448 }; 449 450 static ssize_t 451 sched_fair_server_period_write(struct file *filp, const char __user *ubuf, 452 size_t cnt, loff_t *ppos) 453 { 454 return sched_fair_server_write(filp, ubuf, cnt, ppos, DL_PERIOD); 455 } 456 457 static int sched_fair_server_period_show(struct seq_file *m, void *v) 458 { 459 return sched_fair_server_show(m, v, DL_PERIOD); 460 } 461 462 static int sched_fair_server_period_open(struct inode *inode, struct file *filp) 463 { 464 return single_open(filp, sched_fair_server_period_show, inode->i_private); 465 } 466 467 static const struct file_operations fair_server_period_fops = { 468 .open = sched_fair_server_period_open, 469 .write = sched_fair_server_period_write, 470 .read = seq_read, 471 .llseek = seq_lseek, 472 .release = single_release, 473 }; 474 475 static struct dentry *debugfs_sched; 476 477 static void debugfs_fair_server_init(void) 478 { 479 struct dentry *d_fair; 480 unsigned long cpu; 481 482 d_fair = debugfs_create_dir("fair_server", debugfs_sched); 483 if (!d_fair) 484 return; 485 486 for_each_possible_cpu(cpu) { 487 struct dentry *d_cpu; 488 char buf[32]; 489 490 snprintf(buf, sizeof(buf), "cpu%lu", cpu); 491 d_cpu = debugfs_create_dir(buf, d_fair); 492 493 debugfs_create_file("runtime", 0644, d_cpu, (void *) cpu, &fair_server_runtime_fops); 494 debugfs_create_file("period", 0644, d_cpu, (void *) cpu, &fair_server_period_fops); 495 } 496 } 497 498 static __init int sched_init_debug(void) 499 { 500 struct dentry __maybe_unused *numa; 501 502 debugfs_sched = debugfs_create_dir("sched", NULL); 503 504 debugfs_create_file("features", 0644, debugfs_sched, NULL, &sched_feat_fops); 505 debugfs_create_file_unsafe("verbose", 0644, debugfs_sched, &sched_debug_verbose, &sched_verbose_fops); 506 #ifdef CONFIG_PREEMPT_DYNAMIC 507 debugfs_create_file("preempt", 0644, debugfs_sched, NULL, &sched_dynamic_fops); 508 #endif 509 510 debugfs_create_u32("base_slice_ns", 0644, debugfs_sched, &sysctl_sched_base_slice); 511 512 debugfs_create_u32("latency_warn_ms", 0644, debugfs_sched, &sysctl_resched_latency_warn_ms); 513 debugfs_create_u32("latency_warn_once", 0644, debugfs_sched, &sysctl_resched_latency_warn_once); 514 515 #ifdef CONFIG_SMP 516 debugfs_create_file("tunable_scaling", 0644, debugfs_sched, NULL, &sched_scaling_fops); 517 debugfs_create_u32("migration_cost_ns", 0644, debugfs_sched, &sysctl_sched_migration_cost); 518 debugfs_create_u32("nr_migrate", 0644, debugfs_sched, &sysctl_sched_nr_migrate); 519 520 sched_domains_mutex_lock(); 521 update_sched_domain_debugfs(); 522 sched_domains_mutex_unlock(); 523 #endif 524 525 #ifdef CONFIG_NUMA_BALANCING 526 numa = debugfs_create_dir("numa_balancing", debugfs_sched); 527 528 debugfs_create_u32("scan_delay_ms", 0644, numa, &sysctl_numa_balancing_scan_delay); 529 debugfs_create_u32("scan_period_min_ms", 0644, numa, &sysctl_numa_balancing_scan_period_min); 530 debugfs_create_u32("scan_period_max_ms", 0644, numa, &sysctl_numa_balancing_scan_period_max); 531 debugfs_create_u32("scan_size_mb", 0644, numa, &sysctl_numa_balancing_scan_size); 532 debugfs_create_u32("hot_threshold_ms", 0644, numa, &sysctl_numa_balancing_hot_threshold); 533 #endif 534 535 debugfs_create_file("debug", 0444, debugfs_sched, NULL, &sched_debug_fops); 536 537 debugfs_fair_server_init(); 538 539 return 0; 540 } 541 late_initcall(sched_init_debug); 542 543 #ifdef CONFIG_SMP 544 545 static cpumask_var_t sd_sysctl_cpus; 546 547 static int sd_flags_show(struct seq_file *m, void *v) 548 { 549 unsigned long flags = *(unsigned int *)m->private; 550 int idx; 551 552 for_each_set_bit(idx, &flags, __SD_FLAG_CNT) { 553 seq_puts(m, sd_flag_debug[idx].name); 554 seq_puts(m, " "); 555 } 556 seq_puts(m, "\n"); 557 558 return 0; 559 } 560 561 static int sd_flags_open(struct inode *inode, struct file *file) 562 { 563 return single_open(file, sd_flags_show, inode->i_private); 564 } 565 566 static const struct file_operations sd_flags_fops = { 567 .open = sd_flags_open, 568 .read = seq_read, 569 .llseek = seq_lseek, 570 .release = single_release, 571 }; 572 573 static void register_sd(struct sched_domain *sd, struct dentry *parent) 574 { 575 #define SDM(type, mode, member) \ 576 debugfs_create_##type(#member, mode, parent, &sd->member) 577 578 SDM(ulong, 0644, min_interval); 579 SDM(ulong, 0644, max_interval); 580 SDM(u64, 0644, max_newidle_lb_cost); 581 SDM(u32, 0644, busy_factor); 582 SDM(u32, 0644, imbalance_pct); 583 SDM(u32, 0644, cache_nice_tries); 584 SDM(str, 0444, name); 585 586 #undef SDM 587 588 debugfs_create_file("flags", 0444, parent, &sd->flags, &sd_flags_fops); 589 debugfs_create_file("groups_flags", 0444, parent, &sd->groups->flags, &sd_flags_fops); 590 debugfs_create_u32("level", 0444, parent, (u32 *)&sd->level); 591 592 if (sd->flags & SD_ASYM_PACKING) 593 debugfs_create_u32("group_asym_prefer_cpu", 0444, parent, 594 (u32 *)&sd->groups->asym_prefer_cpu); 595 } 596 597 void update_sched_domain_debugfs(void) 598 { 599 int cpu, i; 600 601 /* 602 * This can unfortunately be invoked before sched_debug_init() creates 603 * the debug directory. Don't touch sd_sysctl_cpus until then. 604 */ 605 if (!debugfs_sched) 606 return; 607 608 if (!sched_debug_verbose) 609 return; 610 611 if (!cpumask_available(sd_sysctl_cpus)) { 612 if (!alloc_cpumask_var(&sd_sysctl_cpus, GFP_KERNEL)) 613 return; 614 cpumask_copy(sd_sysctl_cpus, cpu_possible_mask); 615 } 616 617 if (!sd_dentry) { 618 sd_dentry = debugfs_create_dir("domains", debugfs_sched); 619 620 /* rebuild sd_sysctl_cpus if empty since it gets cleared below */ 621 if (cpumask_empty(sd_sysctl_cpus)) 622 cpumask_copy(sd_sysctl_cpus, cpu_online_mask); 623 } 624 625 for_each_cpu(cpu, sd_sysctl_cpus) { 626 struct sched_domain *sd; 627 struct dentry *d_cpu; 628 char buf[32]; 629 630 snprintf(buf, sizeof(buf), "cpu%d", cpu); 631 debugfs_lookup_and_remove(buf, sd_dentry); 632 d_cpu = debugfs_create_dir(buf, sd_dentry); 633 634 i = 0; 635 for_each_domain(cpu, sd) { 636 struct dentry *d_sd; 637 638 snprintf(buf, sizeof(buf), "domain%d", i); 639 d_sd = debugfs_create_dir(buf, d_cpu); 640 641 register_sd(sd, d_sd); 642 i++; 643 } 644 645 __cpumask_clear_cpu(cpu, sd_sysctl_cpus); 646 } 647 } 648 649 void dirty_sched_domain_sysctl(int cpu) 650 { 651 if (cpumask_available(sd_sysctl_cpus)) 652 __cpumask_set_cpu(cpu, sd_sysctl_cpus); 653 } 654 655 #endif /* CONFIG_SMP */ 656 657 #ifdef CONFIG_FAIR_GROUP_SCHED 658 static void print_cfs_group_stats(struct seq_file *m, int cpu, struct task_group *tg) 659 { 660 struct sched_entity *se = tg->se[cpu]; 661 662 #define P(F) SEQ_printf(m, " .%-30s: %lld\n", #F, (long long)F) 663 #define P_SCHEDSTAT(F) SEQ_printf(m, " .%-30s: %lld\n", \ 664 #F, (long long)schedstat_val(stats->F)) 665 #define PN(F) SEQ_printf(m, " .%-30s: %lld.%06ld\n", #F, SPLIT_NS((long long)F)) 666 #define PN_SCHEDSTAT(F) SEQ_printf(m, " .%-30s: %lld.%06ld\n", \ 667 #F, SPLIT_NS((long long)schedstat_val(stats->F))) 668 669 if (!se) 670 return; 671 672 PN(se->exec_start); 673 PN(se->vruntime); 674 PN(se->sum_exec_runtime); 675 676 if (schedstat_enabled()) { 677 struct sched_statistics *stats; 678 stats = __schedstats_from_se(se); 679 680 PN_SCHEDSTAT(wait_start); 681 PN_SCHEDSTAT(sleep_start); 682 PN_SCHEDSTAT(block_start); 683 PN_SCHEDSTAT(sleep_max); 684 PN_SCHEDSTAT(block_max); 685 PN_SCHEDSTAT(exec_max); 686 PN_SCHEDSTAT(slice_max); 687 PN_SCHEDSTAT(wait_max); 688 PN_SCHEDSTAT(wait_sum); 689 P_SCHEDSTAT(wait_count); 690 } 691 692 P(se->load.weight); 693 #ifdef CONFIG_SMP 694 P(se->avg.load_avg); 695 P(se->avg.util_avg); 696 P(se->avg.runnable_avg); 697 #endif 698 699 #undef PN_SCHEDSTAT 700 #undef PN 701 #undef P_SCHEDSTAT 702 #undef P 703 } 704 #endif 705 706 #ifdef CONFIG_CGROUP_SCHED 707 static DEFINE_SPINLOCK(sched_debug_lock); 708 static char group_path[PATH_MAX]; 709 710 static void task_group_path(struct task_group *tg, char *path, int plen) 711 { 712 if (autogroup_path(tg, path, plen)) 713 return; 714 715 cgroup_path(tg->css.cgroup, path, plen); 716 } 717 718 /* 719 * Only 1 SEQ_printf_task_group_path() caller can use the full length 720 * group_path[] for cgroup path. Other simultaneous callers will have 721 * to use a shorter stack buffer. A "..." suffix is appended at the end 722 * of the stack buffer so that it will show up in case the output length 723 * matches the given buffer size to indicate possible path name truncation. 724 */ 725 #define SEQ_printf_task_group_path(m, tg, fmt...) \ 726 { \ 727 if (spin_trylock(&sched_debug_lock)) { \ 728 task_group_path(tg, group_path, sizeof(group_path)); \ 729 SEQ_printf(m, fmt, group_path); \ 730 spin_unlock(&sched_debug_lock); \ 731 } else { \ 732 char buf[128]; \ 733 char *bufend = buf + sizeof(buf) - 3; \ 734 task_group_path(tg, buf, bufend - buf); \ 735 strcpy(bufend - 1, "..."); \ 736 SEQ_printf(m, fmt, buf); \ 737 } \ 738 } 739 #endif 740 741 static void 742 print_task(struct seq_file *m, struct rq *rq, struct task_struct *p) 743 { 744 if (task_current(rq, p)) 745 SEQ_printf(m, ">R"); 746 else 747 SEQ_printf(m, " %c", task_state_to_char(p)); 748 749 SEQ_printf(m, " %15s %5d %9Ld.%06ld %c %9Ld.%06ld %c %9Ld.%06ld %9Ld.%06ld %9Ld %5d ", 750 p->comm, task_pid_nr(p), 751 SPLIT_NS(p->se.vruntime), 752 entity_eligible(cfs_rq_of(&p->se), &p->se) ? 'E' : 'N', 753 SPLIT_NS(p->se.deadline), 754 p->se.custom_slice ? 'S' : ' ', 755 SPLIT_NS(p->se.slice), 756 SPLIT_NS(p->se.sum_exec_runtime), 757 (long long)(p->nvcsw + p->nivcsw), 758 p->prio); 759 760 SEQ_printf(m, "%9lld.%06ld %9lld.%06ld %9lld.%06ld", 761 SPLIT_NS(schedstat_val_or_zero(p->stats.wait_sum)), 762 SPLIT_NS(schedstat_val_or_zero(p->stats.sum_sleep_runtime)), 763 SPLIT_NS(schedstat_val_or_zero(p->stats.sum_block_runtime))); 764 765 #ifdef CONFIG_NUMA_BALANCING 766 SEQ_printf(m, " %d %d", task_node(p), task_numa_group_id(p)); 767 #endif 768 #ifdef CONFIG_CGROUP_SCHED 769 SEQ_printf_task_group_path(m, task_group(p), " %s") 770 #endif 771 772 SEQ_printf(m, "\n"); 773 } 774 775 static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu) 776 { 777 struct task_struct *g, *p; 778 779 SEQ_printf(m, "\n"); 780 SEQ_printf(m, "runnable tasks:\n"); 781 SEQ_printf(m, " S task PID vruntime eligible " 782 "deadline slice sum-exec switches " 783 "prio wait-time sum-sleep sum-block" 784 #ifdef CONFIG_NUMA_BALANCING 785 " node group-id" 786 #endif 787 #ifdef CONFIG_CGROUP_SCHED 788 " group-path" 789 #endif 790 "\n"); 791 SEQ_printf(m, "-------------------------------------------------------" 792 "------------------------------------------------------" 793 "------------------------------------------------------" 794 #ifdef CONFIG_NUMA_BALANCING 795 "--------------" 796 #endif 797 #ifdef CONFIG_CGROUP_SCHED 798 "--------------" 799 #endif 800 "\n"); 801 802 rcu_read_lock(); 803 for_each_process_thread(g, p) { 804 if (task_cpu(p) != rq_cpu) 805 continue; 806 807 print_task(m, rq, p); 808 } 809 rcu_read_unlock(); 810 } 811 812 void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq) 813 { 814 s64 left_vruntime = -1, min_vruntime, right_vruntime = -1, left_deadline = -1, spread; 815 struct sched_entity *last, *first, *root; 816 struct rq *rq = cpu_rq(cpu); 817 unsigned long flags; 818 819 #ifdef CONFIG_FAIR_GROUP_SCHED 820 SEQ_printf(m, "\n"); 821 SEQ_printf_task_group_path(m, cfs_rq->tg, "cfs_rq[%d]:%s\n", cpu); 822 #else 823 SEQ_printf(m, "\n"); 824 SEQ_printf(m, "cfs_rq[%d]:\n", cpu); 825 #endif 826 827 raw_spin_rq_lock_irqsave(rq, flags); 828 root = __pick_root_entity(cfs_rq); 829 if (root) 830 left_vruntime = root->min_vruntime; 831 first = __pick_first_entity(cfs_rq); 832 if (first) 833 left_deadline = first->deadline; 834 last = __pick_last_entity(cfs_rq); 835 if (last) 836 right_vruntime = last->vruntime; 837 min_vruntime = cfs_rq->min_vruntime; 838 raw_spin_rq_unlock_irqrestore(rq, flags); 839 840 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "left_deadline", 841 SPLIT_NS(left_deadline)); 842 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "left_vruntime", 843 SPLIT_NS(left_vruntime)); 844 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "min_vruntime", 845 SPLIT_NS(min_vruntime)); 846 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "avg_vruntime", 847 SPLIT_NS(avg_vruntime(cfs_rq))); 848 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "right_vruntime", 849 SPLIT_NS(right_vruntime)); 850 spread = right_vruntime - left_vruntime; 851 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "spread", SPLIT_NS(spread)); 852 SEQ_printf(m, " .%-30s: %d\n", "nr_queued", cfs_rq->nr_queued); 853 SEQ_printf(m, " .%-30s: %d\n", "h_nr_runnable", cfs_rq->h_nr_runnable); 854 SEQ_printf(m, " .%-30s: %d\n", "h_nr_queued", cfs_rq->h_nr_queued); 855 SEQ_printf(m, " .%-30s: %d\n", "h_nr_idle", cfs_rq->h_nr_idle); 856 SEQ_printf(m, " .%-30s: %ld\n", "load", cfs_rq->load.weight); 857 #ifdef CONFIG_SMP 858 SEQ_printf(m, " .%-30s: %lu\n", "load_avg", 859 cfs_rq->avg.load_avg); 860 SEQ_printf(m, " .%-30s: %lu\n", "runnable_avg", 861 cfs_rq->avg.runnable_avg); 862 SEQ_printf(m, " .%-30s: %lu\n", "util_avg", 863 cfs_rq->avg.util_avg); 864 SEQ_printf(m, " .%-30s: %u\n", "util_est", 865 cfs_rq->avg.util_est); 866 SEQ_printf(m, " .%-30s: %ld\n", "removed.load_avg", 867 cfs_rq->removed.load_avg); 868 SEQ_printf(m, " .%-30s: %ld\n", "removed.util_avg", 869 cfs_rq->removed.util_avg); 870 SEQ_printf(m, " .%-30s: %ld\n", "removed.runnable_avg", 871 cfs_rq->removed.runnable_avg); 872 #ifdef CONFIG_FAIR_GROUP_SCHED 873 SEQ_printf(m, " .%-30s: %lu\n", "tg_load_avg_contrib", 874 cfs_rq->tg_load_avg_contrib); 875 SEQ_printf(m, " .%-30s: %ld\n", "tg_load_avg", 876 atomic_long_read(&cfs_rq->tg->load_avg)); 877 #endif 878 #endif 879 #ifdef CONFIG_CFS_BANDWIDTH 880 SEQ_printf(m, " .%-30s: %d\n", "throttled", 881 cfs_rq->throttled); 882 SEQ_printf(m, " .%-30s: %d\n", "throttle_count", 883 cfs_rq->throttle_count); 884 #endif 885 886 #ifdef CONFIG_FAIR_GROUP_SCHED 887 print_cfs_group_stats(m, cpu, cfs_rq->tg); 888 #endif 889 } 890 891 void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq) 892 { 893 #ifdef CONFIG_RT_GROUP_SCHED 894 SEQ_printf(m, "\n"); 895 SEQ_printf_task_group_path(m, rt_rq->tg, "rt_rq[%d]:%s\n", cpu); 896 #else 897 SEQ_printf(m, "\n"); 898 SEQ_printf(m, "rt_rq[%d]:\n", cpu); 899 #endif 900 901 #define P(x) \ 902 SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rt_rq->x)) 903 #define PU(x) \ 904 SEQ_printf(m, " .%-30s: %lu\n", #x, (unsigned long)(rt_rq->x)) 905 #define PN(x) \ 906 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rt_rq->x)) 907 908 PU(rt_nr_running); 909 910 #ifdef CONFIG_RT_GROUP_SCHED 911 P(rt_throttled); 912 PN(rt_time); 913 PN(rt_runtime); 914 #endif 915 916 #undef PN 917 #undef PU 918 #undef P 919 } 920 921 void print_dl_rq(struct seq_file *m, int cpu, struct dl_rq *dl_rq) 922 { 923 struct dl_bw *dl_bw; 924 925 SEQ_printf(m, "\n"); 926 SEQ_printf(m, "dl_rq[%d]:\n", cpu); 927 928 #define PU(x) \ 929 SEQ_printf(m, " .%-30s: %lu\n", #x, (unsigned long)(dl_rq->x)) 930 931 PU(dl_nr_running); 932 #ifdef CONFIG_SMP 933 dl_bw = &cpu_rq(cpu)->rd->dl_bw; 934 #else 935 dl_bw = &dl_rq->dl_bw; 936 #endif 937 SEQ_printf(m, " .%-30s: %lld\n", "dl_bw->bw", dl_bw->bw); 938 SEQ_printf(m, " .%-30s: %lld\n", "dl_bw->total_bw", dl_bw->total_bw); 939 940 #undef PU 941 } 942 943 static void print_cpu(struct seq_file *m, int cpu) 944 { 945 struct rq *rq = cpu_rq(cpu); 946 947 #ifdef CONFIG_X86 948 { 949 unsigned int freq = cpu_khz ? : 1; 950 951 SEQ_printf(m, "cpu#%d, %u.%03u MHz\n", 952 cpu, freq / 1000, (freq % 1000)); 953 } 954 #else 955 SEQ_printf(m, "cpu#%d\n", cpu); 956 #endif 957 958 #define P(x) \ 959 do { \ 960 if (sizeof(rq->x) == 4) \ 961 SEQ_printf(m, " .%-30s: %d\n", #x, (int)(rq->x)); \ 962 else \ 963 SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rq->x));\ 964 } while (0) 965 966 #define PN(x) \ 967 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rq->x)) 968 969 P(nr_running); 970 P(nr_switches); 971 P(nr_uninterruptible); 972 PN(next_balance); 973 SEQ_printf(m, " .%-30s: %ld\n", "curr->pid", (long)(task_pid_nr(rq->curr))); 974 PN(clock); 975 PN(clock_task); 976 #undef P 977 #undef PN 978 979 #ifdef CONFIG_SMP 980 #define P64(n) SEQ_printf(m, " .%-30s: %Ld\n", #n, rq->n); 981 P64(avg_idle); 982 P64(max_idle_balance_cost); 983 #undef P64 984 #endif 985 986 #define P(n) SEQ_printf(m, " .%-30s: %d\n", #n, schedstat_val(rq->n)); 987 if (schedstat_enabled()) { 988 P(yld_count); 989 P(sched_count); 990 P(sched_goidle); 991 P(ttwu_count); 992 P(ttwu_local); 993 } 994 #undef P 995 996 print_cfs_stats(m, cpu); 997 print_rt_stats(m, cpu); 998 print_dl_stats(m, cpu); 999 1000 print_rq(m, rq, cpu); 1001 SEQ_printf(m, "\n"); 1002 } 1003 1004 static const char *sched_tunable_scaling_names[] = { 1005 "none", 1006 "logarithmic", 1007 "linear" 1008 }; 1009 1010 static void sched_debug_header(struct seq_file *m) 1011 { 1012 u64 ktime, sched_clk, cpu_clk; 1013 unsigned long flags; 1014 1015 local_irq_save(flags); 1016 ktime = ktime_to_ns(ktime_get()); 1017 sched_clk = sched_clock(); 1018 cpu_clk = local_clock(); 1019 local_irq_restore(flags); 1020 1021 SEQ_printf(m, "Sched Debug Version: v0.11, %s %.*s\n", 1022 init_utsname()->release, 1023 (int)strcspn(init_utsname()->version, " "), 1024 init_utsname()->version); 1025 1026 #define P(x) \ 1027 SEQ_printf(m, "%-40s: %Ld\n", #x, (long long)(x)) 1028 #define PN(x) \ 1029 SEQ_printf(m, "%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x)) 1030 PN(ktime); 1031 PN(sched_clk); 1032 PN(cpu_clk); 1033 P(jiffies); 1034 #ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK 1035 P(sched_clock_stable()); 1036 #endif 1037 #undef PN 1038 #undef P 1039 1040 SEQ_printf(m, "\n"); 1041 SEQ_printf(m, "sysctl_sched\n"); 1042 1043 #define P(x) \ 1044 SEQ_printf(m, " .%-40s: %Ld\n", #x, (long long)(x)) 1045 #define PN(x) \ 1046 SEQ_printf(m, " .%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x)) 1047 PN(sysctl_sched_base_slice); 1048 P(sysctl_sched_features); 1049 #undef PN 1050 #undef P 1051 1052 SEQ_printf(m, " .%-40s: %d (%s)\n", 1053 "sysctl_sched_tunable_scaling", 1054 sysctl_sched_tunable_scaling, 1055 sched_tunable_scaling_names[sysctl_sched_tunable_scaling]); 1056 SEQ_printf(m, "\n"); 1057 } 1058 1059 static int sched_debug_show(struct seq_file *m, void *v) 1060 { 1061 int cpu = (unsigned long)(v - 2); 1062 1063 if (cpu != -1) 1064 print_cpu(m, cpu); 1065 else 1066 sched_debug_header(m); 1067 1068 return 0; 1069 } 1070 1071 void sysrq_sched_debug_show(void) 1072 { 1073 int cpu; 1074 1075 sched_debug_header(NULL); 1076 for_each_online_cpu(cpu) { 1077 /* 1078 * Need to reset softlockup watchdogs on all CPUs, because 1079 * another CPU might be blocked waiting for us to process 1080 * an IPI or stop_machine. 1081 */ 1082 touch_nmi_watchdog(); 1083 touch_all_softlockup_watchdogs(); 1084 print_cpu(NULL, cpu); 1085 } 1086 } 1087 1088 /* 1089 * This iterator needs some explanation. 1090 * It returns 1 for the header position. 1091 * This means 2 is CPU 0. 1092 * In a hotplugged system some CPUs, including CPU 0, may be missing so we have 1093 * to use cpumask_* to iterate over the CPUs. 1094 */ 1095 static void *sched_debug_start(struct seq_file *file, loff_t *offset) 1096 { 1097 unsigned long n = *offset; 1098 1099 if (n == 0) 1100 return (void *) 1; 1101 1102 n--; 1103 1104 if (n > 0) 1105 n = cpumask_next(n - 1, cpu_online_mask); 1106 else 1107 n = cpumask_first(cpu_online_mask); 1108 1109 *offset = n + 1; 1110 1111 if (n < nr_cpu_ids) 1112 return (void *)(unsigned long)(n + 2); 1113 1114 return NULL; 1115 } 1116 1117 static void *sched_debug_next(struct seq_file *file, void *data, loff_t *offset) 1118 { 1119 (*offset)++; 1120 return sched_debug_start(file, offset); 1121 } 1122 1123 static void sched_debug_stop(struct seq_file *file, void *data) 1124 { 1125 } 1126 1127 static const struct seq_operations sched_debug_sops = { 1128 .start = sched_debug_start, 1129 .next = sched_debug_next, 1130 .stop = sched_debug_stop, 1131 .show = sched_debug_show, 1132 }; 1133 1134 #define __PS(S, F) SEQ_printf(m, "%-45s:%21Ld\n", S, (long long)(F)) 1135 #define __P(F) __PS(#F, F) 1136 #define P(F) __PS(#F, p->F) 1137 #define PM(F, M) __PS(#F, p->F & (M)) 1138 #define __PSN(S, F) SEQ_printf(m, "%-45s:%14Ld.%06ld\n", S, SPLIT_NS((long long)(F))) 1139 #define __PN(F) __PSN(#F, F) 1140 #define PN(F) __PSN(#F, p->F) 1141 1142 1143 #ifdef CONFIG_NUMA_BALANCING 1144 void print_numa_stats(struct seq_file *m, int node, unsigned long tsf, 1145 unsigned long tpf, unsigned long gsf, unsigned long gpf) 1146 { 1147 SEQ_printf(m, "numa_faults node=%d ", node); 1148 SEQ_printf(m, "task_private=%lu task_shared=%lu ", tpf, tsf); 1149 SEQ_printf(m, "group_private=%lu group_shared=%lu\n", gpf, gsf); 1150 } 1151 #endif 1152 1153 1154 static void sched_show_numa(struct task_struct *p, struct seq_file *m) 1155 { 1156 #ifdef CONFIG_NUMA_BALANCING 1157 if (p->mm) 1158 P(mm->numa_scan_seq); 1159 1160 P(numa_pages_migrated); 1161 P(numa_preferred_nid); 1162 P(total_numa_faults); 1163 SEQ_printf(m, "current_node=%d, numa_group_id=%d\n", 1164 task_node(p), task_numa_group_id(p)); 1165 show_numa_stats(p, m); 1166 #endif 1167 } 1168 1169 void proc_sched_show_task(struct task_struct *p, struct pid_namespace *ns, 1170 struct seq_file *m) 1171 { 1172 unsigned long nr_switches; 1173 1174 SEQ_printf(m, "%s (%d, #threads: %d)\n", p->comm, task_pid_nr_ns(p, ns), 1175 get_nr_threads(p)); 1176 SEQ_printf(m, 1177 "---------------------------------------------------------" 1178 "----------\n"); 1179 1180 #define P_SCHEDSTAT(F) __PS(#F, schedstat_val(p->stats.F)) 1181 #define PN_SCHEDSTAT(F) __PSN(#F, schedstat_val(p->stats.F)) 1182 1183 PN(se.exec_start); 1184 PN(se.vruntime); 1185 PN(se.sum_exec_runtime); 1186 1187 nr_switches = p->nvcsw + p->nivcsw; 1188 1189 P(se.nr_migrations); 1190 1191 if (schedstat_enabled()) { 1192 u64 avg_atom, avg_per_cpu; 1193 1194 PN_SCHEDSTAT(sum_sleep_runtime); 1195 PN_SCHEDSTAT(sum_block_runtime); 1196 PN_SCHEDSTAT(wait_start); 1197 PN_SCHEDSTAT(sleep_start); 1198 PN_SCHEDSTAT(block_start); 1199 PN_SCHEDSTAT(sleep_max); 1200 PN_SCHEDSTAT(block_max); 1201 PN_SCHEDSTAT(exec_max); 1202 PN_SCHEDSTAT(slice_max); 1203 PN_SCHEDSTAT(wait_max); 1204 PN_SCHEDSTAT(wait_sum); 1205 P_SCHEDSTAT(wait_count); 1206 PN_SCHEDSTAT(iowait_sum); 1207 P_SCHEDSTAT(iowait_count); 1208 P_SCHEDSTAT(nr_migrations_cold); 1209 P_SCHEDSTAT(nr_failed_migrations_affine); 1210 P_SCHEDSTAT(nr_failed_migrations_running); 1211 P_SCHEDSTAT(nr_failed_migrations_hot); 1212 P_SCHEDSTAT(nr_forced_migrations); 1213 #ifdef CONFIG_NUMA_BALANCING 1214 P_SCHEDSTAT(numa_task_migrated); 1215 P_SCHEDSTAT(numa_task_swapped); 1216 #endif 1217 P_SCHEDSTAT(nr_wakeups); 1218 P_SCHEDSTAT(nr_wakeups_sync); 1219 P_SCHEDSTAT(nr_wakeups_migrate); 1220 P_SCHEDSTAT(nr_wakeups_local); 1221 P_SCHEDSTAT(nr_wakeups_remote); 1222 P_SCHEDSTAT(nr_wakeups_affine); 1223 P_SCHEDSTAT(nr_wakeups_affine_attempts); 1224 P_SCHEDSTAT(nr_wakeups_passive); 1225 P_SCHEDSTAT(nr_wakeups_idle); 1226 1227 avg_atom = p->se.sum_exec_runtime; 1228 if (nr_switches) 1229 avg_atom = div64_ul(avg_atom, nr_switches); 1230 else 1231 avg_atom = -1LL; 1232 1233 avg_per_cpu = p->se.sum_exec_runtime; 1234 if (p->se.nr_migrations) { 1235 avg_per_cpu = div64_u64(avg_per_cpu, 1236 p->se.nr_migrations); 1237 } else { 1238 avg_per_cpu = -1LL; 1239 } 1240 1241 __PN(avg_atom); 1242 __PN(avg_per_cpu); 1243 1244 #ifdef CONFIG_SCHED_CORE 1245 PN_SCHEDSTAT(core_forceidle_sum); 1246 #endif 1247 } 1248 1249 __P(nr_switches); 1250 __PS("nr_voluntary_switches", p->nvcsw); 1251 __PS("nr_involuntary_switches", p->nivcsw); 1252 1253 P(se.load.weight); 1254 #ifdef CONFIG_SMP 1255 P(se.avg.load_sum); 1256 P(se.avg.runnable_sum); 1257 P(se.avg.util_sum); 1258 P(se.avg.load_avg); 1259 P(se.avg.runnable_avg); 1260 P(se.avg.util_avg); 1261 P(se.avg.last_update_time); 1262 PM(se.avg.util_est, ~UTIL_AVG_UNCHANGED); 1263 #endif 1264 #ifdef CONFIG_UCLAMP_TASK 1265 __PS("uclamp.min", p->uclamp_req[UCLAMP_MIN].value); 1266 __PS("uclamp.max", p->uclamp_req[UCLAMP_MAX].value); 1267 __PS("effective uclamp.min", uclamp_eff_value(p, UCLAMP_MIN)); 1268 __PS("effective uclamp.max", uclamp_eff_value(p, UCLAMP_MAX)); 1269 #endif 1270 P(policy); 1271 P(prio); 1272 if (task_has_dl_policy(p)) { 1273 P(dl.runtime); 1274 P(dl.deadline); 1275 } else if (fair_policy(p->policy)) { 1276 P(se.slice); 1277 } 1278 #ifdef CONFIG_SCHED_CLASS_EXT 1279 __PS("ext.enabled", task_on_scx(p)); 1280 #endif 1281 #undef PN_SCHEDSTAT 1282 #undef P_SCHEDSTAT 1283 1284 { 1285 unsigned int this_cpu = raw_smp_processor_id(); 1286 u64 t0, t1; 1287 1288 t0 = cpu_clock(this_cpu); 1289 t1 = cpu_clock(this_cpu); 1290 __PS("clock-delta", t1-t0); 1291 } 1292 1293 sched_show_numa(p, m); 1294 } 1295 1296 void proc_sched_set_task(struct task_struct *p) 1297 { 1298 #ifdef CONFIG_SCHEDSTATS 1299 memset(&p->stats, 0, sizeof(p->stats)); 1300 #endif 1301 } 1302 1303 void resched_latency_warn(int cpu, u64 latency) 1304 { 1305 static DEFINE_RATELIMIT_STATE(latency_check_ratelimit, 60 * 60 * HZ, 1); 1306 1307 if (likely(!__ratelimit(&latency_check_ratelimit))) 1308 return; 1309 1310 pr_err("sched: CPU %d need_resched set for > %llu ns (%d ticks) without schedule\n", 1311 cpu, latency, cpu_rq(cpu)->ticks_without_resched); 1312 dump_stack(); 1313 } 1314