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 /proc/sched_debug and 12 * to the console 13 */ 14 #define SEQ_printf(m, x...) \ 15 do { \ 16 if (m) \ 17 seq_printf(m, x); \ 18 else \ 19 pr_cont(x); \ 20 } while (0) 21 22 /* 23 * Ease the printing of nsec fields: 24 */ 25 static long long nsec_high(unsigned long long nsec) 26 { 27 if ((long long)nsec < 0) { 28 nsec = -nsec; 29 do_div(nsec, 1000000); 30 return -nsec; 31 } 32 do_div(nsec, 1000000); 33 34 return nsec; 35 } 36 37 static unsigned long nsec_low(unsigned long long nsec) 38 { 39 if ((long long)nsec < 0) 40 nsec = -nsec; 41 42 return do_div(nsec, 1000000); 43 } 44 45 #define SPLIT_NS(x) nsec_high(x), nsec_low(x) 46 47 #define SCHED_FEAT(name, enabled) \ 48 #name , 49 50 static const char * const sched_feat_names[] = { 51 #include "features.h" 52 }; 53 54 #undef SCHED_FEAT 55 56 static int sched_feat_show(struct seq_file *m, void *v) 57 { 58 int i; 59 60 for (i = 0; i < __SCHED_FEAT_NR; i++) { 61 if (!(sysctl_sched_features & (1UL << i))) 62 seq_puts(m, "NO_"); 63 seq_printf(m, "%s ", sched_feat_names[i]); 64 } 65 seq_puts(m, "\n"); 66 67 return 0; 68 } 69 70 #ifdef CONFIG_JUMP_LABEL 71 72 #define jump_label_key__true STATIC_KEY_INIT_TRUE 73 #define jump_label_key__false STATIC_KEY_INIT_FALSE 74 75 #define SCHED_FEAT(name, enabled) \ 76 jump_label_key__##enabled , 77 78 struct static_key sched_feat_keys[__SCHED_FEAT_NR] = { 79 #include "features.h" 80 }; 81 82 #undef SCHED_FEAT 83 84 static void sched_feat_disable(int i) 85 { 86 static_key_disable_cpuslocked(&sched_feat_keys[i]); 87 } 88 89 static void sched_feat_enable(int i) 90 { 91 static_key_enable_cpuslocked(&sched_feat_keys[i]); 92 } 93 #else 94 static void sched_feat_disable(int i) { }; 95 static void sched_feat_enable(int i) { }; 96 #endif /* CONFIG_JUMP_LABEL */ 97 98 static int sched_feat_set(char *cmp) 99 { 100 int i; 101 int neg = 0; 102 103 if (strncmp(cmp, "NO_", 3) == 0) { 104 neg = 1; 105 cmp += 3; 106 } 107 108 i = match_string(sched_feat_names, __SCHED_FEAT_NR, cmp); 109 if (i < 0) 110 return i; 111 112 if (neg) { 113 sysctl_sched_features &= ~(1UL << i); 114 sched_feat_disable(i); 115 } else { 116 sysctl_sched_features |= (1UL << i); 117 sched_feat_enable(i); 118 } 119 120 return 0; 121 } 122 123 static ssize_t 124 sched_feat_write(struct file *filp, const char __user *ubuf, 125 size_t cnt, loff_t *ppos) 126 { 127 char buf[64]; 128 char *cmp; 129 int ret; 130 struct inode *inode; 131 132 if (cnt > 63) 133 cnt = 63; 134 135 if (copy_from_user(&buf, ubuf, cnt)) 136 return -EFAULT; 137 138 buf[cnt] = 0; 139 cmp = strstrip(buf); 140 141 /* Ensure the static_key remains in a consistent state */ 142 inode = file_inode(filp); 143 cpus_read_lock(); 144 inode_lock(inode); 145 ret = sched_feat_set(cmp); 146 inode_unlock(inode); 147 cpus_read_unlock(); 148 if (ret < 0) 149 return ret; 150 151 *ppos += cnt; 152 153 return cnt; 154 } 155 156 static int sched_feat_open(struct inode *inode, struct file *filp) 157 { 158 return single_open(filp, sched_feat_show, NULL); 159 } 160 161 static const struct file_operations sched_feat_fops = { 162 .open = sched_feat_open, 163 .write = sched_feat_write, 164 .read = seq_read, 165 .llseek = seq_lseek, 166 .release = single_release, 167 }; 168 169 #ifdef CONFIG_SMP 170 171 static ssize_t sched_scaling_write(struct file *filp, const char __user *ubuf, 172 size_t cnt, loff_t *ppos) 173 { 174 char buf[16]; 175 unsigned int scaling; 176 177 if (cnt > 15) 178 cnt = 15; 179 180 if (copy_from_user(&buf, ubuf, cnt)) 181 return -EFAULT; 182 buf[cnt] = '\0'; 183 184 if (kstrtouint(buf, 10, &scaling)) 185 return -EINVAL; 186 187 if (scaling >= SCHED_TUNABLESCALING_END) 188 return -EINVAL; 189 190 sysctl_sched_tunable_scaling = scaling; 191 if (sched_update_scaling()) 192 return -EINVAL; 193 194 *ppos += cnt; 195 return cnt; 196 } 197 198 static int sched_scaling_show(struct seq_file *m, void *v) 199 { 200 seq_printf(m, "%d\n", sysctl_sched_tunable_scaling); 201 return 0; 202 } 203 204 static int sched_scaling_open(struct inode *inode, struct file *filp) 205 { 206 return single_open(filp, sched_scaling_show, NULL); 207 } 208 209 static const struct file_operations sched_scaling_fops = { 210 .open = sched_scaling_open, 211 .write = sched_scaling_write, 212 .read = seq_read, 213 .llseek = seq_lseek, 214 .release = single_release, 215 }; 216 217 #endif /* SMP */ 218 219 #ifdef CONFIG_PREEMPT_DYNAMIC 220 221 static ssize_t sched_dynamic_write(struct file *filp, const char __user *ubuf, 222 size_t cnt, loff_t *ppos) 223 { 224 char buf[16]; 225 int mode; 226 227 if (cnt > 15) 228 cnt = 15; 229 230 if (copy_from_user(&buf, ubuf, cnt)) 231 return -EFAULT; 232 233 buf[cnt] = 0; 234 mode = sched_dynamic_mode(strstrip(buf)); 235 if (mode < 0) 236 return mode; 237 238 sched_dynamic_update(mode); 239 240 *ppos += cnt; 241 242 return cnt; 243 } 244 245 static int sched_dynamic_show(struct seq_file *m, void *v) 246 { 247 static const char * preempt_modes[] = { 248 "none", "voluntary", "full" 249 }; 250 int i; 251 252 for (i = 0; i < ARRAY_SIZE(preempt_modes); i++) { 253 if (preempt_dynamic_mode == i) 254 seq_puts(m, "("); 255 seq_puts(m, preempt_modes[i]); 256 if (preempt_dynamic_mode == i) 257 seq_puts(m, ")"); 258 259 seq_puts(m, " "); 260 } 261 262 seq_puts(m, "\n"); 263 return 0; 264 } 265 266 static int sched_dynamic_open(struct inode *inode, struct file *filp) 267 { 268 return single_open(filp, sched_dynamic_show, NULL); 269 } 270 271 static const struct file_operations sched_dynamic_fops = { 272 .open = sched_dynamic_open, 273 .write = sched_dynamic_write, 274 .read = seq_read, 275 .llseek = seq_lseek, 276 .release = single_release, 277 }; 278 279 #endif /* CONFIG_PREEMPT_DYNAMIC */ 280 281 __read_mostly bool sched_debug_verbose; 282 283 #ifdef CONFIG_SMP 284 static struct dentry *sd_dentry; 285 286 287 static ssize_t sched_verbose_write(struct file *filp, const char __user *ubuf, 288 size_t cnt, loff_t *ppos) 289 { 290 ssize_t result; 291 bool orig; 292 293 cpus_read_lock(); 294 mutex_lock(&sched_domains_mutex); 295 296 orig = sched_debug_verbose; 297 result = debugfs_write_file_bool(filp, ubuf, cnt, ppos); 298 299 if (sched_debug_verbose && !orig) 300 update_sched_domain_debugfs(); 301 else if (!sched_debug_verbose && orig) { 302 debugfs_remove(sd_dentry); 303 sd_dentry = NULL; 304 } 305 306 mutex_unlock(&sched_domains_mutex); 307 cpus_read_unlock(); 308 309 return result; 310 } 311 #else 312 #define sched_verbose_write debugfs_write_file_bool 313 #endif 314 315 static const struct file_operations sched_verbose_fops = { 316 .read = debugfs_read_file_bool, 317 .write = sched_verbose_write, 318 .open = simple_open, 319 .llseek = default_llseek, 320 }; 321 322 static const struct seq_operations sched_debug_sops; 323 324 static int sched_debug_open(struct inode *inode, struct file *filp) 325 { 326 return seq_open(filp, &sched_debug_sops); 327 } 328 329 static const struct file_operations sched_debug_fops = { 330 .open = sched_debug_open, 331 .read = seq_read, 332 .llseek = seq_lseek, 333 .release = seq_release, 334 }; 335 336 static struct dentry *debugfs_sched; 337 338 static __init int sched_init_debug(void) 339 { 340 struct dentry __maybe_unused *numa; 341 342 debugfs_sched = debugfs_create_dir("sched", NULL); 343 344 debugfs_create_file("features", 0644, debugfs_sched, NULL, &sched_feat_fops); 345 debugfs_create_file_unsafe("verbose", 0644, debugfs_sched, &sched_debug_verbose, &sched_verbose_fops); 346 #ifdef CONFIG_PREEMPT_DYNAMIC 347 debugfs_create_file("preempt", 0644, debugfs_sched, NULL, &sched_dynamic_fops); 348 #endif 349 350 debugfs_create_u32("latency_ns", 0644, debugfs_sched, &sysctl_sched_latency); 351 debugfs_create_u32("min_granularity_ns", 0644, debugfs_sched, &sysctl_sched_min_granularity); 352 debugfs_create_u32("idle_min_granularity_ns", 0644, debugfs_sched, &sysctl_sched_idle_min_granularity); 353 debugfs_create_u32("wakeup_granularity_ns", 0644, debugfs_sched, &sysctl_sched_wakeup_granularity); 354 355 debugfs_create_u32("latency_warn_ms", 0644, debugfs_sched, &sysctl_resched_latency_warn_ms); 356 debugfs_create_u32("latency_warn_once", 0644, debugfs_sched, &sysctl_resched_latency_warn_once); 357 358 #ifdef CONFIG_SMP 359 debugfs_create_file("tunable_scaling", 0644, debugfs_sched, NULL, &sched_scaling_fops); 360 debugfs_create_u32("migration_cost_ns", 0644, debugfs_sched, &sysctl_sched_migration_cost); 361 debugfs_create_u32("nr_migrate", 0644, debugfs_sched, &sysctl_sched_nr_migrate); 362 363 mutex_lock(&sched_domains_mutex); 364 update_sched_domain_debugfs(); 365 mutex_unlock(&sched_domains_mutex); 366 #endif 367 368 #ifdef CONFIG_NUMA_BALANCING 369 numa = debugfs_create_dir("numa_balancing", debugfs_sched); 370 371 debugfs_create_u32("scan_delay_ms", 0644, numa, &sysctl_numa_balancing_scan_delay); 372 debugfs_create_u32("scan_period_min_ms", 0644, numa, &sysctl_numa_balancing_scan_period_min); 373 debugfs_create_u32("scan_period_max_ms", 0644, numa, &sysctl_numa_balancing_scan_period_max); 374 debugfs_create_u32("scan_size_mb", 0644, numa, &sysctl_numa_balancing_scan_size); 375 debugfs_create_u32("hot_threshold_ms", 0644, numa, &sysctl_numa_balancing_hot_threshold); 376 #endif 377 378 debugfs_create_file("debug", 0444, debugfs_sched, NULL, &sched_debug_fops); 379 380 return 0; 381 } 382 late_initcall(sched_init_debug); 383 384 #ifdef CONFIG_SMP 385 386 static cpumask_var_t sd_sysctl_cpus; 387 388 static int sd_flags_show(struct seq_file *m, void *v) 389 { 390 unsigned long flags = *(unsigned int *)m->private; 391 int idx; 392 393 for_each_set_bit(idx, &flags, __SD_FLAG_CNT) { 394 seq_puts(m, sd_flag_debug[idx].name); 395 seq_puts(m, " "); 396 } 397 seq_puts(m, "\n"); 398 399 return 0; 400 } 401 402 static int sd_flags_open(struct inode *inode, struct file *file) 403 { 404 return single_open(file, sd_flags_show, inode->i_private); 405 } 406 407 static const struct file_operations sd_flags_fops = { 408 .open = sd_flags_open, 409 .read = seq_read, 410 .llseek = seq_lseek, 411 .release = single_release, 412 }; 413 414 static void register_sd(struct sched_domain *sd, struct dentry *parent) 415 { 416 #define SDM(type, mode, member) \ 417 debugfs_create_##type(#member, mode, parent, &sd->member) 418 419 SDM(ulong, 0644, min_interval); 420 SDM(ulong, 0644, max_interval); 421 SDM(u64, 0644, max_newidle_lb_cost); 422 SDM(u32, 0644, busy_factor); 423 SDM(u32, 0644, imbalance_pct); 424 SDM(u32, 0644, cache_nice_tries); 425 SDM(str, 0444, name); 426 427 #undef SDM 428 429 debugfs_create_file("flags", 0444, parent, &sd->flags, &sd_flags_fops); 430 } 431 432 void update_sched_domain_debugfs(void) 433 { 434 int cpu, i; 435 436 /* 437 * This can unfortunately be invoked before sched_debug_init() creates 438 * the debug directory. Don't touch sd_sysctl_cpus until then. 439 */ 440 if (!debugfs_sched) 441 return; 442 443 if (!sched_debug_verbose) 444 return; 445 446 if (!cpumask_available(sd_sysctl_cpus)) { 447 if (!alloc_cpumask_var(&sd_sysctl_cpus, GFP_KERNEL)) 448 return; 449 cpumask_copy(sd_sysctl_cpus, cpu_possible_mask); 450 } 451 452 if (!sd_dentry) { 453 sd_dentry = debugfs_create_dir("domains", debugfs_sched); 454 455 /* rebuild sd_sysctl_cpus if empty since it gets cleared below */ 456 if (cpumask_empty(sd_sysctl_cpus)) 457 cpumask_copy(sd_sysctl_cpus, cpu_online_mask); 458 } 459 460 for_each_cpu(cpu, sd_sysctl_cpus) { 461 struct sched_domain *sd; 462 struct dentry *d_cpu; 463 char buf[32]; 464 465 snprintf(buf, sizeof(buf), "cpu%d", cpu); 466 debugfs_lookup_and_remove(buf, sd_dentry); 467 d_cpu = debugfs_create_dir(buf, sd_dentry); 468 469 i = 0; 470 for_each_domain(cpu, sd) { 471 struct dentry *d_sd; 472 473 snprintf(buf, sizeof(buf), "domain%d", i); 474 d_sd = debugfs_create_dir(buf, d_cpu); 475 476 register_sd(sd, d_sd); 477 i++; 478 } 479 480 __cpumask_clear_cpu(cpu, sd_sysctl_cpus); 481 } 482 } 483 484 void dirty_sched_domain_sysctl(int cpu) 485 { 486 if (cpumask_available(sd_sysctl_cpus)) 487 __cpumask_set_cpu(cpu, sd_sysctl_cpus); 488 } 489 490 #endif /* CONFIG_SMP */ 491 492 #ifdef CONFIG_FAIR_GROUP_SCHED 493 static void print_cfs_group_stats(struct seq_file *m, int cpu, struct task_group *tg) 494 { 495 struct sched_entity *se = tg->se[cpu]; 496 497 #define P(F) SEQ_printf(m, " .%-30s: %lld\n", #F, (long long)F) 498 #define P_SCHEDSTAT(F) SEQ_printf(m, " .%-30s: %lld\n", \ 499 #F, (long long)schedstat_val(stats->F)) 500 #define PN(F) SEQ_printf(m, " .%-30s: %lld.%06ld\n", #F, SPLIT_NS((long long)F)) 501 #define PN_SCHEDSTAT(F) SEQ_printf(m, " .%-30s: %lld.%06ld\n", \ 502 #F, SPLIT_NS((long long)schedstat_val(stats->F))) 503 504 if (!se) 505 return; 506 507 PN(se->exec_start); 508 PN(se->vruntime); 509 PN(se->sum_exec_runtime); 510 511 if (schedstat_enabled()) { 512 struct sched_statistics *stats; 513 stats = __schedstats_from_se(se); 514 515 PN_SCHEDSTAT(wait_start); 516 PN_SCHEDSTAT(sleep_start); 517 PN_SCHEDSTAT(block_start); 518 PN_SCHEDSTAT(sleep_max); 519 PN_SCHEDSTAT(block_max); 520 PN_SCHEDSTAT(exec_max); 521 PN_SCHEDSTAT(slice_max); 522 PN_SCHEDSTAT(wait_max); 523 PN_SCHEDSTAT(wait_sum); 524 P_SCHEDSTAT(wait_count); 525 } 526 527 P(se->load.weight); 528 #ifdef CONFIG_SMP 529 P(se->avg.load_avg); 530 P(se->avg.util_avg); 531 P(se->avg.runnable_avg); 532 #endif 533 534 #undef PN_SCHEDSTAT 535 #undef PN 536 #undef P_SCHEDSTAT 537 #undef P 538 } 539 #endif 540 541 #ifdef CONFIG_CGROUP_SCHED 542 static DEFINE_SPINLOCK(sched_debug_lock); 543 static char group_path[PATH_MAX]; 544 545 static void task_group_path(struct task_group *tg, char *path, int plen) 546 { 547 if (autogroup_path(tg, path, plen)) 548 return; 549 550 cgroup_path(tg->css.cgroup, path, plen); 551 } 552 553 /* 554 * Only 1 SEQ_printf_task_group_path() caller can use the full length 555 * group_path[] for cgroup path. Other simultaneous callers will have 556 * to use a shorter stack buffer. A "..." suffix is appended at the end 557 * of the stack buffer so that it will show up in case the output length 558 * matches the given buffer size to indicate possible path name truncation. 559 */ 560 #define SEQ_printf_task_group_path(m, tg, fmt...) \ 561 { \ 562 if (spin_trylock(&sched_debug_lock)) { \ 563 task_group_path(tg, group_path, sizeof(group_path)); \ 564 SEQ_printf(m, fmt, group_path); \ 565 spin_unlock(&sched_debug_lock); \ 566 } else { \ 567 char buf[128]; \ 568 char *bufend = buf + sizeof(buf) - 3; \ 569 task_group_path(tg, buf, bufend - buf); \ 570 strcpy(bufend - 1, "..."); \ 571 SEQ_printf(m, fmt, buf); \ 572 } \ 573 } 574 #endif 575 576 static void 577 print_task(struct seq_file *m, struct rq *rq, struct task_struct *p) 578 { 579 if (task_current(rq, p)) 580 SEQ_printf(m, ">R"); 581 else 582 SEQ_printf(m, " %c", task_state_to_char(p)); 583 584 SEQ_printf(m, " %15s %5d %9Ld.%06ld %9Ld %5d ", 585 p->comm, task_pid_nr(p), 586 SPLIT_NS(p->se.vruntime), 587 (long long)(p->nvcsw + p->nivcsw), 588 p->prio); 589 590 SEQ_printf(m, "%9lld.%06ld %9lld.%06ld %9lld.%06ld %9lld.%06ld", 591 SPLIT_NS(schedstat_val_or_zero(p->stats.wait_sum)), 592 SPLIT_NS(p->se.sum_exec_runtime), 593 SPLIT_NS(schedstat_val_or_zero(p->stats.sum_sleep_runtime)), 594 SPLIT_NS(schedstat_val_or_zero(p->stats.sum_block_runtime))); 595 596 #ifdef CONFIG_NUMA_BALANCING 597 SEQ_printf(m, " %d %d", task_node(p), task_numa_group_id(p)); 598 #endif 599 #ifdef CONFIG_CGROUP_SCHED 600 SEQ_printf_task_group_path(m, task_group(p), " %s") 601 #endif 602 603 SEQ_printf(m, "\n"); 604 } 605 606 static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu) 607 { 608 struct task_struct *g, *p; 609 610 SEQ_printf(m, "\n"); 611 SEQ_printf(m, "runnable tasks:\n"); 612 SEQ_printf(m, " S task PID tree-key switches prio" 613 " wait-time sum-exec sum-sleep\n"); 614 SEQ_printf(m, "-------------------------------------------------------" 615 "------------------------------------------------------\n"); 616 617 rcu_read_lock(); 618 for_each_process_thread(g, p) { 619 if (task_cpu(p) != rq_cpu) 620 continue; 621 622 print_task(m, rq, p); 623 } 624 rcu_read_unlock(); 625 } 626 627 void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq) 628 { 629 s64 MIN_vruntime = -1, min_vruntime, max_vruntime = -1, 630 spread, rq0_min_vruntime, spread0; 631 struct rq *rq = cpu_rq(cpu); 632 struct sched_entity *last; 633 unsigned long flags; 634 635 #ifdef CONFIG_FAIR_GROUP_SCHED 636 SEQ_printf(m, "\n"); 637 SEQ_printf_task_group_path(m, cfs_rq->tg, "cfs_rq[%d]:%s\n", cpu); 638 #else 639 SEQ_printf(m, "\n"); 640 SEQ_printf(m, "cfs_rq[%d]:\n", cpu); 641 #endif 642 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "exec_clock", 643 SPLIT_NS(cfs_rq->exec_clock)); 644 645 raw_spin_rq_lock_irqsave(rq, flags); 646 if (rb_first_cached(&cfs_rq->tasks_timeline)) 647 MIN_vruntime = (__pick_first_entity(cfs_rq))->vruntime; 648 last = __pick_last_entity(cfs_rq); 649 if (last) 650 max_vruntime = last->vruntime; 651 min_vruntime = cfs_rq->min_vruntime; 652 rq0_min_vruntime = cpu_rq(0)->cfs.min_vruntime; 653 raw_spin_rq_unlock_irqrestore(rq, flags); 654 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "MIN_vruntime", 655 SPLIT_NS(MIN_vruntime)); 656 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "min_vruntime", 657 SPLIT_NS(min_vruntime)); 658 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "max_vruntime", 659 SPLIT_NS(max_vruntime)); 660 spread = max_vruntime - MIN_vruntime; 661 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "spread", 662 SPLIT_NS(spread)); 663 spread0 = min_vruntime - rq0_min_vruntime; 664 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "spread0", 665 SPLIT_NS(spread0)); 666 SEQ_printf(m, " .%-30s: %d\n", "nr_spread_over", 667 cfs_rq->nr_spread_over); 668 SEQ_printf(m, " .%-30s: %d\n", "nr_running", cfs_rq->nr_running); 669 SEQ_printf(m, " .%-30s: %d\n", "h_nr_running", cfs_rq->h_nr_running); 670 SEQ_printf(m, " .%-30s: %d\n", "idle_nr_running", 671 cfs_rq->idle_nr_running); 672 SEQ_printf(m, " .%-30s: %d\n", "idle_h_nr_running", 673 cfs_rq->idle_h_nr_running); 674 SEQ_printf(m, " .%-30s: %ld\n", "load", cfs_rq->load.weight); 675 #ifdef CONFIG_SMP 676 SEQ_printf(m, " .%-30s: %lu\n", "load_avg", 677 cfs_rq->avg.load_avg); 678 SEQ_printf(m, " .%-30s: %lu\n", "runnable_avg", 679 cfs_rq->avg.runnable_avg); 680 SEQ_printf(m, " .%-30s: %lu\n", "util_avg", 681 cfs_rq->avg.util_avg); 682 SEQ_printf(m, " .%-30s: %u\n", "util_est_enqueued", 683 cfs_rq->avg.util_est.enqueued); 684 SEQ_printf(m, " .%-30s: %ld\n", "removed.load_avg", 685 cfs_rq->removed.load_avg); 686 SEQ_printf(m, " .%-30s: %ld\n", "removed.util_avg", 687 cfs_rq->removed.util_avg); 688 SEQ_printf(m, " .%-30s: %ld\n", "removed.runnable_avg", 689 cfs_rq->removed.runnable_avg); 690 #ifdef CONFIG_FAIR_GROUP_SCHED 691 SEQ_printf(m, " .%-30s: %lu\n", "tg_load_avg_contrib", 692 cfs_rq->tg_load_avg_contrib); 693 SEQ_printf(m, " .%-30s: %ld\n", "tg_load_avg", 694 atomic_long_read(&cfs_rq->tg->load_avg)); 695 #endif 696 #endif 697 #ifdef CONFIG_CFS_BANDWIDTH 698 SEQ_printf(m, " .%-30s: %d\n", "throttled", 699 cfs_rq->throttled); 700 SEQ_printf(m, " .%-30s: %d\n", "throttle_count", 701 cfs_rq->throttle_count); 702 #endif 703 704 #ifdef CONFIG_FAIR_GROUP_SCHED 705 print_cfs_group_stats(m, cpu, cfs_rq->tg); 706 #endif 707 } 708 709 void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq) 710 { 711 #ifdef CONFIG_RT_GROUP_SCHED 712 SEQ_printf(m, "\n"); 713 SEQ_printf_task_group_path(m, rt_rq->tg, "rt_rq[%d]:%s\n", cpu); 714 #else 715 SEQ_printf(m, "\n"); 716 SEQ_printf(m, "rt_rq[%d]:\n", cpu); 717 #endif 718 719 #define P(x) \ 720 SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rt_rq->x)) 721 #define PU(x) \ 722 SEQ_printf(m, " .%-30s: %lu\n", #x, (unsigned long)(rt_rq->x)) 723 #define PN(x) \ 724 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rt_rq->x)) 725 726 PU(rt_nr_running); 727 #ifdef CONFIG_SMP 728 PU(rt_nr_migratory); 729 #endif 730 P(rt_throttled); 731 PN(rt_time); 732 PN(rt_runtime); 733 734 #undef PN 735 #undef PU 736 #undef P 737 } 738 739 void print_dl_rq(struct seq_file *m, int cpu, struct dl_rq *dl_rq) 740 { 741 struct dl_bw *dl_bw; 742 743 SEQ_printf(m, "\n"); 744 SEQ_printf(m, "dl_rq[%d]:\n", cpu); 745 746 #define PU(x) \ 747 SEQ_printf(m, " .%-30s: %lu\n", #x, (unsigned long)(dl_rq->x)) 748 749 PU(dl_nr_running); 750 #ifdef CONFIG_SMP 751 PU(dl_nr_migratory); 752 dl_bw = &cpu_rq(cpu)->rd->dl_bw; 753 #else 754 dl_bw = &dl_rq->dl_bw; 755 #endif 756 SEQ_printf(m, " .%-30s: %lld\n", "dl_bw->bw", dl_bw->bw); 757 SEQ_printf(m, " .%-30s: %lld\n", "dl_bw->total_bw", dl_bw->total_bw); 758 759 #undef PU 760 } 761 762 static void print_cpu(struct seq_file *m, int cpu) 763 { 764 struct rq *rq = cpu_rq(cpu); 765 766 #ifdef CONFIG_X86 767 { 768 unsigned int freq = cpu_khz ? : 1; 769 770 SEQ_printf(m, "cpu#%d, %u.%03u MHz\n", 771 cpu, freq / 1000, (freq % 1000)); 772 } 773 #else 774 SEQ_printf(m, "cpu#%d\n", cpu); 775 #endif 776 777 #define P(x) \ 778 do { \ 779 if (sizeof(rq->x) == 4) \ 780 SEQ_printf(m, " .%-30s: %ld\n", #x, (long)(rq->x)); \ 781 else \ 782 SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rq->x));\ 783 } while (0) 784 785 #define PN(x) \ 786 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rq->x)) 787 788 P(nr_running); 789 P(nr_switches); 790 P(nr_uninterruptible); 791 PN(next_balance); 792 SEQ_printf(m, " .%-30s: %ld\n", "curr->pid", (long)(task_pid_nr(rq->curr))); 793 PN(clock); 794 PN(clock_task); 795 #undef P 796 #undef PN 797 798 #ifdef CONFIG_SMP 799 #define P64(n) SEQ_printf(m, " .%-30s: %Ld\n", #n, rq->n); 800 P64(avg_idle); 801 P64(max_idle_balance_cost); 802 #undef P64 803 #endif 804 805 #define P(n) SEQ_printf(m, " .%-30s: %d\n", #n, schedstat_val(rq->n)); 806 if (schedstat_enabled()) { 807 P(yld_count); 808 P(sched_count); 809 P(sched_goidle); 810 P(ttwu_count); 811 P(ttwu_local); 812 } 813 #undef P 814 815 print_cfs_stats(m, cpu); 816 print_rt_stats(m, cpu); 817 print_dl_stats(m, cpu); 818 819 print_rq(m, rq, cpu); 820 SEQ_printf(m, "\n"); 821 } 822 823 static const char *sched_tunable_scaling_names[] = { 824 "none", 825 "logarithmic", 826 "linear" 827 }; 828 829 static void sched_debug_header(struct seq_file *m) 830 { 831 u64 ktime, sched_clk, cpu_clk; 832 unsigned long flags; 833 834 local_irq_save(flags); 835 ktime = ktime_to_ns(ktime_get()); 836 sched_clk = sched_clock(); 837 cpu_clk = local_clock(); 838 local_irq_restore(flags); 839 840 SEQ_printf(m, "Sched Debug Version: v0.11, %s %.*s\n", 841 init_utsname()->release, 842 (int)strcspn(init_utsname()->version, " "), 843 init_utsname()->version); 844 845 #define P(x) \ 846 SEQ_printf(m, "%-40s: %Ld\n", #x, (long long)(x)) 847 #define PN(x) \ 848 SEQ_printf(m, "%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x)) 849 PN(ktime); 850 PN(sched_clk); 851 PN(cpu_clk); 852 P(jiffies); 853 #ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK 854 P(sched_clock_stable()); 855 #endif 856 #undef PN 857 #undef P 858 859 SEQ_printf(m, "\n"); 860 SEQ_printf(m, "sysctl_sched\n"); 861 862 #define P(x) \ 863 SEQ_printf(m, " .%-40s: %Ld\n", #x, (long long)(x)) 864 #define PN(x) \ 865 SEQ_printf(m, " .%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x)) 866 PN(sysctl_sched_latency); 867 PN(sysctl_sched_min_granularity); 868 PN(sysctl_sched_idle_min_granularity); 869 PN(sysctl_sched_wakeup_granularity); 870 P(sysctl_sched_child_runs_first); 871 P(sysctl_sched_features); 872 #undef PN 873 #undef P 874 875 SEQ_printf(m, " .%-40s: %d (%s)\n", 876 "sysctl_sched_tunable_scaling", 877 sysctl_sched_tunable_scaling, 878 sched_tunable_scaling_names[sysctl_sched_tunable_scaling]); 879 SEQ_printf(m, "\n"); 880 } 881 882 static int sched_debug_show(struct seq_file *m, void *v) 883 { 884 int cpu = (unsigned long)(v - 2); 885 886 if (cpu != -1) 887 print_cpu(m, cpu); 888 else 889 sched_debug_header(m); 890 891 return 0; 892 } 893 894 void sysrq_sched_debug_show(void) 895 { 896 int cpu; 897 898 sched_debug_header(NULL); 899 for_each_online_cpu(cpu) { 900 /* 901 * Need to reset softlockup watchdogs on all CPUs, because 902 * another CPU might be blocked waiting for us to process 903 * an IPI or stop_machine. 904 */ 905 touch_nmi_watchdog(); 906 touch_all_softlockup_watchdogs(); 907 print_cpu(NULL, cpu); 908 } 909 } 910 911 /* 912 * This iterator needs some explanation. 913 * It returns 1 for the header position. 914 * This means 2 is CPU 0. 915 * In a hotplugged system some CPUs, including CPU 0, may be missing so we have 916 * to use cpumask_* to iterate over the CPUs. 917 */ 918 static void *sched_debug_start(struct seq_file *file, loff_t *offset) 919 { 920 unsigned long n = *offset; 921 922 if (n == 0) 923 return (void *) 1; 924 925 n--; 926 927 if (n > 0) 928 n = cpumask_next(n - 1, cpu_online_mask); 929 else 930 n = cpumask_first(cpu_online_mask); 931 932 *offset = n + 1; 933 934 if (n < nr_cpu_ids) 935 return (void *)(unsigned long)(n + 2); 936 937 return NULL; 938 } 939 940 static void *sched_debug_next(struct seq_file *file, void *data, loff_t *offset) 941 { 942 (*offset)++; 943 return sched_debug_start(file, offset); 944 } 945 946 static void sched_debug_stop(struct seq_file *file, void *data) 947 { 948 } 949 950 static const struct seq_operations sched_debug_sops = { 951 .start = sched_debug_start, 952 .next = sched_debug_next, 953 .stop = sched_debug_stop, 954 .show = sched_debug_show, 955 }; 956 957 #define __PS(S, F) SEQ_printf(m, "%-45s:%21Ld\n", S, (long long)(F)) 958 #define __P(F) __PS(#F, F) 959 #define P(F) __PS(#F, p->F) 960 #define PM(F, M) __PS(#F, p->F & (M)) 961 #define __PSN(S, F) SEQ_printf(m, "%-45s:%14Ld.%06ld\n", S, SPLIT_NS((long long)(F))) 962 #define __PN(F) __PSN(#F, F) 963 #define PN(F) __PSN(#F, p->F) 964 965 966 #ifdef CONFIG_NUMA_BALANCING 967 void print_numa_stats(struct seq_file *m, int node, unsigned long tsf, 968 unsigned long tpf, unsigned long gsf, unsigned long gpf) 969 { 970 SEQ_printf(m, "numa_faults node=%d ", node); 971 SEQ_printf(m, "task_private=%lu task_shared=%lu ", tpf, tsf); 972 SEQ_printf(m, "group_private=%lu group_shared=%lu\n", gpf, gsf); 973 } 974 #endif 975 976 977 static void sched_show_numa(struct task_struct *p, struct seq_file *m) 978 { 979 #ifdef CONFIG_NUMA_BALANCING 980 if (p->mm) 981 P(mm->numa_scan_seq); 982 983 P(numa_pages_migrated); 984 P(numa_preferred_nid); 985 P(total_numa_faults); 986 SEQ_printf(m, "current_node=%d, numa_group_id=%d\n", 987 task_node(p), task_numa_group_id(p)); 988 show_numa_stats(p, m); 989 #endif 990 } 991 992 void proc_sched_show_task(struct task_struct *p, struct pid_namespace *ns, 993 struct seq_file *m) 994 { 995 unsigned long nr_switches; 996 997 SEQ_printf(m, "%s (%d, #threads: %d)\n", p->comm, task_pid_nr_ns(p, ns), 998 get_nr_threads(p)); 999 SEQ_printf(m, 1000 "---------------------------------------------------------" 1001 "----------\n"); 1002 1003 #define P_SCHEDSTAT(F) __PS(#F, schedstat_val(p->stats.F)) 1004 #define PN_SCHEDSTAT(F) __PSN(#F, schedstat_val(p->stats.F)) 1005 1006 PN(se.exec_start); 1007 PN(se.vruntime); 1008 PN(se.sum_exec_runtime); 1009 1010 nr_switches = p->nvcsw + p->nivcsw; 1011 1012 P(se.nr_migrations); 1013 1014 if (schedstat_enabled()) { 1015 u64 avg_atom, avg_per_cpu; 1016 1017 PN_SCHEDSTAT(sum_sleep_runtime); 1018 PN_SCHEDSTAT(sum_block_runtime); 1019 PN_SCHEDSTAT(wait_start); 1020 PN_SCHEDSTAT(sleep_start); 1021 PN_SCHEDSTAT(block_start); 1022 PN_SCHEDSTAT(sleep_max); 1023 PN_SCHEDSTAT(block_max); 1024 PN_SCHEDSTAT(exec_max); 1025 PN_SCHEDSTAT(slice_max); 1026 PN_SCHEDSTAT(wait_max); 1027 PN_SCHEDSTAT(wait_sum); 1028 P_SCHEDSTAT(wait_count); 1029 PN_SCHEDSTAT(iowait_sum); 1030 P_SCHEDSTAT(iowait_count); 1031 P_SCHEDSTAT(nr_migrations_cold); 1032 P_SCHEDSTAT(nr_failed_migrations_affine); 1033 P_SCHEDSTAT(nr_failed_migrations_running); 1034 P_SCHEDSTAT(nr_failed_migrations_hot); 1035 P_SCHEDSTAT(nr_forced_migrations); 1036 P_SCHEDSTAT(nr_wakeups); 1037 P_SCHEDSTAT(nr_wakeups_sync); 1038 P_SCHEDSTAT(nr_wakeups_migrate); 1039 P_SCHEDSTAT(nr_wakeups_local); 1040 P_SCHEDSTAT(nr_wakeups_remote); 1041 P_SCHEDSTAT(nr_wakeups_affine); 1042 P_SCHEDSTAT(nr_wakeups_affine_attempts); 1043 P_SCHEDSTAT(nr_wakeups_passive); 1044 P_SCHEDSTAT(nr_wakeups_idle); 1045 1046 avg_atom = p->se.sum_exec_runtime; 1047 if (nr_switches) 1048 avg_atom = div64_ul(avg_atom, nr_switches); 1049 else 1050 avg_atom = -1LL; 1051 1052 avg_per_cpu = p->se.sum_exec_runtime; 1053 if (p->se.nr_migrations) { 1054 avg_per_cpu = div64_u64(avg_per_cpu, 1055 p->se.nr_migrations); 1056 } else { 1057 avg_per_cpu = -1LL; 1058 } 1059 1060 __PN(avg_atom); 1061 __PN(avg_per_cpu); 1062 1063 #ifdef CONFIG_SCHED_CORE 1064 PN_SCHEDSTAT(core_forceidle_sum); 1065 #endif 1066 } 1067 1068 __P(nr_switches); 1069 __PS("nr_voluntary_switches", p->nvcsw); 1070 __PS("nr_involuntary_switches", p->nivcsw); 1071 1072 P(se.load.weight); 1073 #ifdef CONFIG_SMP 1074 P(se.avg.load_sum); 1075 P(se.avg.runnable_sum); 1076 P(se.avg.util_sum); 1077 P(se.avg.load_avg); 1078 P(se.avg.runnable_avg); 1079 P(se.avg.util_avg); 1080 P(se.avg.last_update_time); 1081 P(se.avg.util_est.ewma); 1082 PM(se.avg.util_est.enqueued, ~UTIL_AVG_UNCHANGED); 1083 #endif 1084 #ifdef CONFIG_UCLAMP_TASK 1085 __PS("uclamp.min", p->uclamp_req[UCLAMP_MIN].value); 1086 __PS("uclamp.max", p->uclamp_req[UCLAMP_MAX].value); 1087 __PS("effective uclamp.min", uclamp_eff_value(p, UCLAMP_MIN)); 1088 __PS("effective uclamp.max", uclamp_eff_value(p, UCLAMP_MAX)); 1089 #endif 1090 P(policy); 1091 P(prio); 1092 if (task_has_dl_policy(p)) { 1093 P(dl.runtime); 1094 P(dl.deadline); 1095 } 1096 #undef PN_SCHEDSTAT 1097 #undef P_SCHEDSTAT 1098 1099 { 1100 unsigned int this_cpu = raw_smp_processor_id(); 1101 u64 t0, t1; 1102 1103 t0 = cpu_clock(this_cpu); 1104 t1 = cpu_clock(this_cpu); 1105 __PS("clock-delta", t1-t0); 1106 } 1107 1108 sched_show_numa(p, m); 1109 } 1110 1111 void proc_sched_set_task(struct task_struct *p) 1112 { 1113 #ifdef CONFIG_SCHEDSTATS 1114 memset(&p->stats, 0, sizeof(p->stats)); 1115 #endif 1116 } 1117 1118 void resched_latency_warn(int cpu, u64 latency) 1119 { 1120 static DEFINE_RATELIMIT_STATE(latency_check_ratelimit, 60 * 60 * HZ, 1); 1121 1122 WARN(__ratelimit(&latency_check_ratelimit), 1123 "sched: CPU %d need_resched set for > %llu ns (%d ticks) " 1124 "without schedule\n", 1125 cpu, latency, cpu_rq(cpu)->ticks_without_resched); 1126 } 1127