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 static const struct seq_operations sched_debug_sops; 284 285 static int sched_debug_open(struct inode *inode, struct file *filp) 286 { 287 return seq_open(filp, &sched_debug_sops); 288 } 289 290 static const struct file_operations sched_debug_fops = { 291 .open = sched_debug_open, 292 .read = seq_read, 293 .llseek = seq_lseek, 294 .release = seq_release, 295 }; 296 297 static struct dentry *debugfs_sched; 298 299 static __init int sched_init_debug(void) 300 { 301 struct dentry __maybe_unused *numa; 302 303 debugfs_sched = debugfs_create_dir("sched", NULL); 304 305 debugfs_create_file("features", 0644, debugfs_sched, NULL, &sched_feat_fops); 306 debugfs_create_bool("verbose", 0644, debugfs_sched, &sched_debug_verbose); 307 #ifdef CONFIG_PREEMPT_DYNAMIC 308 debugfs_create_file("preempt", 0644, debugfs_sched, NULL, &sched_dynamic_fops); 309 #endif 310 311 debugfs_create_u32("latency_ns", 0644, debugfs_sched, &sysctl_sched_latency); 312 debugfs_create_u32("min_granularity_ns", 0644, debugfs_sched, &sysctl_sched_min_granularity); 313 debugfs_create_u32("idle_min_granularity_ns", 0644, debugfs_sched, &sysctl_sched_idle_min_granularity); 314 debugfs_create_u32("wakeup_granularity_ns", 0644, debugfs_sched, &sysctl_sched_wakeup_granularity); 315 316 debugfs_create_u32("latency_warn_ms", 0644, debugfs_sched, &sysctl_resched_latency_warn_ms); 317 debugfs_create_u32("latency_warn_once", 0644, debugfs_sched, &sysctl_resched_latency_warn_once); 318 319 #ifdef CONFIG_SMP 320 debugfs_create_file("tunable_scaling", 0644, debugfs_sched, NULL, &sched_scaling_fops); 321 debugfs_create_u32("migration_cost_ns", 0644, debugfs_sched, &sysctl_sched_migration_cost); 322 debugfs_create_u32("nr_migrate", 0644, debugfs_sched, &sysctl_sched_nr_migrate); 323 324 mutex_lock(&sched_domains_mutex); 325 update_sched_domain_debugfs(); 326 mutex_unlock(&sched_domains_mutex); 327 #endif 328 329 #ifdef CONFIG_NUMA_BALANCING 330 numa = debugfs_create_dir("numa_balancing", debugfs_sched); 331 332 debugfs_create_u32("scan_delay_ms", 0644, numa, &sysctl_numa_balancing_scan_delay); 333 debugfs_create_u32("scan_period_min_ms", 0644, numa, &sysctl_numa_balancing_scan_period_min); 334 debugfs_create_u32("scan_period_max_ms", 0644, numa, &sysctl_numa_balancing_scan_period_max); 335 debugfs_create_u32("scan_size_mb", 0644, numa, &sysctl_numa_balancing_scan_size); 336 debugfs_create_u32("hot_threshold_ms", 0644, numa, &sysctl_numa_balancing_hot_threshold); 337 #endif 338 339 debugfs_create_file("debug", 0444, debugfs_sched, NULL, &sched_debug_fops); 340 341 return 0; 342 } 343 late_initcall(sched_init_debug); 344 345 #ifdef CONFIG_SMP 346 347 static cpumask_var_t sd_sysctl_cpus; 348 static struct dentry *sd_dentry; 349 350 static int sd_flags_show(struct seq_file *m, void *v) 351 { 352 unsigned long flags = *(unsigned int *)m->private; 353 int idx; 354 355 for_each_set_bit(idx, &flags, __SD_FLAG_CNT) { 356 seq_puts(m, sd_flag_debug[idx].name); 357 seq_puts(m, " "); 358 } 359 seq_puts(m, "\n"); 360 361 return 0; 362 } 363 364 static int sd_flags_open(struct inode *inode, struct file *file) 365 { 366 return single_open(file, sd_flags_show, inode->i_private); 367 } 368 369 static const struct file_operations sd_flags_fops = { 370 .open = sd_flags_open, 371 .read = seq_read, 372 .llseek = seq_lseek, 373 .release = single_release, 374 }; 375 376 static void register_sd(struct sched_domain *sd, struct dentry *parent) 377 { 378 #define SDM(type, mode, member) \ 379 debugfs_create_##type(#member, mode, parent, &sd->member) 380 381 SDM(ulong, 0644, min_interval); 382 SDM(ulong, 0644, max_interval); 383 SDM(u64, 0644, max_newidle_lb_cost); 384 SDM(u32, 0644, busy_factor); 385 SDM(u32, 0644, imbalance_pct); 386 SDM(u32, 0644, cache_nice_tries); 387 SDM(str, 0444, name); 388 389 #undef SDM 390 391 debugfs_create_file("flags", 0444, parent, &sd->flags, &sd_flags_fops); 392 } 393 394 void update_sched_domain_debugfs(void) 395 { 396 int cpu, i; 397 398 /* 399 * This can unfortunately be invoked before sched_debug_init() creates 400 * the debug directory. Don't touch sd_sysctl_cpus until then. 401 */ 402 if (!debugfs_sched) 403 return; 404 405 if (!cpumask_available(sd_sysctl_cpus)) { 406 if (!alloc_cpumask_var(&sd_sysctl_cpus, GFP_KERNEL)) 407 return; 408 cpumask_copy(sd_sysctl_cpus, cpu_possible_mask); 409 } 410 411 if (!sd_dentry) 412 sd_dentry = debugfs_create_dir("domains", debugfs_sched); 413 414 for_each_cpu(cpu, sd_sysctl_cpus) { 415 struct sched_domain *sd; 416 struct dentry *d_cpu; 417 char buf[32]; 418 419 snprintf(buf, sizeof(buf), "cpu%d", cpu); 420 debugfs_lookup_and_remove(buf, sd_dentry); 421 d_cpu = debugfs_create_dir(buf, sd_dentry); 422 423 i = 0; 424 for_each_domain(cpu, sd) { 425 struct dentry *d_sd; 426 427 snprintf(buf, sizeof(buf), "domain%d", i); 428 d_sd = debugfs_create_dir(buf, d_cpu); 429 430 register_sd(sd, d_sd); 431 i++; 432 } 433 434 __cpumask_clear_cpu(cpu, sd_sysctl_cpus); 435 } 436 } 437 438 void dirty_sched_domain_sysctl(int cpu) 439 { 440 if (cpumask_available(sd_sysctl_cpus)) 441 __cpumask_set_cpu(cpu, sd_sysctl_cpus); 442 } 443 444 #endif /* CONFIG_SMP */ 445 446 #ifdef CONFIG_FAIR_GROUP_SCHED 447 static void print_cfs_group_stats(struct seq_file *m, int cpu, struct task_group *tg) 448 { 449 struct sched_entity *se = tg->se[cpu]; 450 451 #define P(F) SEQ_printf(m, " .%-30s: %lld\n", #F, (long long)F) 452 #define P_SCHEDSTAT(F) SEQ_printf(m, " .%-30s: %lld\n", \ 453 #F, (long long)schedstat_val(stats->F)) 454 #define PN(F) SEQ_printf(m, " .%-30s: %lld.%06ld\n", #F, SPLIT_NS((long long)F)) 455 #define PN_SCHEDSTAT(F) SEQ_printf(m, " .%-30s: %lld.%06ld\n", \ 456 #F, SPLIT_NS((long long)schedstat_val(stats->F))) 457 458 if (!se) 459 return; 460 461 PN(se->exec_start); 462 PN(se->vruntime); 463 PN(se->sum_exec_runtime); 464 465 if (schedstat_enabled()) { 466 struct sched_statistics *stats; 467 stats = __schedstats_from_se(se); 468 469 PN_SCHEDSTAT(wait_start); 470 PN_SCHEDSTAT(sleep_start); 471 PN_SCHEDSTAT(block_start); 472 PN_SCHEDSTAT(sleep_max); 473 PN_SCHEDSTAT(block_max); 474 PN_SCHEDSTAT(exec_max); 475 PN_SCHEDSTAT(slice_max); 476 PN_SCHEDSTAT(wait_max); 477 PN_SCHEDSTAT(wait_sum); 478 P_SCHEDSTAT(wait_count); 479 } 480 481 P(se->load.weight); 482 #ifdef CONFIG_SMP 483 P(se->avg.load_avg); 484 P(se->avg.util_avg); 485 P(se->avg.runnable_avg); 486 #endif 487 488 #undef PN_SCHEDSTAT 489 #undef PN 490 #undef P_SCHEDSTAT 491 #undef P 492 } 493 #endif 494 495 #ifdef CONFIG_CGROUP_SCHED 496 static DEFINE_SPINLOCK(sched_debug_lock); 497 static char group_path[PATH_MAX]; 498 499 static void task_group_path(struct task_group *tg, char *path, int plen) 500 { 501 if (autogroup_path(tg, path, plen)) 502 return; 503 504 cgroup_path(tg->css.cgroup, path, plen); 505 } 506 507 /* 508 * Only 1 SEQ_printf_task_group_path() caller can use the full length 509 * group_path[] for cgroup path. Other simultaneous callers will have 510 * to use a shorter stack buffer. A "..." suffix is appended at the end 511 * of the stack buffer so that it will show up in case the output length 512 * matches the given buffer size to indicate possible path name truncation. 513 */ 514 #define SEQ_printf_task_group_path(m, tg, fmt...) \ 515 { \ 516 if (spin_trylock(&sched_debug_lock)) { \ 517 task_group_path(tg, group_path, sizeof(group_path)); \ 518 SEQ_printf(m, fmt, group_path); \ 519 spin_unlock(&sched_debug_lock); \ 520 } else { \ 521 char buf[128]; \ 522 char *bufend = buf + sizeof(buf) - 3; \ 523 task_group_path(tg, buf, bufend - buf); \ 524 strcpy(bufend - 1, "..."); \ 525 SEQ_printf(m, fmt, buf); \ 526 } \ 527 } 528 #endif 529 530 static void 531 print_task(struct seq_file *m, struct rq *rq, struct task_struct *p) 532 { 533 if (task_current(rq, p)) 534 SEQ_printf(m, ">R"); 535 else 536 SEQ_printf(m, " %c", task_state_to_char(p)); 537 538 SEQ_printf(m, " %15s %5d %9Ld.%06ld %9Ld %5d ", 539 p->comm, task_pid_nr(p), 540 SPLIT_NS(p->se.vruntime), 541 (long long)(p->nvcsw + p->nivcsw), 542 p->prio); 543 544 SEQ_printf(m, "%9lld.%06ld %9lld.%06ld %9lld.%06ld %9lld.%06ld", 545 SPLIT_NS(schedstat_val_or_zero(p->stats.wait_sum)), 546 SPLIT_NS(p->se.sum_exec_runtime), 547 SPLIT_NS(schedstat_val_or_zero(p->stats.sum_sleep_runtime)), 548 SPLIT_NS(schedstat_val_or_zero(p->stats.sum_block_runtime))); 549 550 #ifdef CONFIG_NUMA_BALANCING 551 SEQ_printf(m, " %d %d", task_node(p), task_numa_group_id(p)); 552 #endif 553 #ifdef CONFIG_CGROUP_SCHED 554 SEQ_printf_task_group_path(m, task_group(p), " %s") 555 #endif 556 557 SEQ_printf(m, "\n"); 558 } 559 560 static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu) 561 { 562 struct task_struct *g, *p; 563 564 SEQ_printf(m, "\n"); 565 SEQ_printf(m, "runnable tasks:\n"); 566 SEQ_printf(m, " S task PID tree-key switches prio" 567 " wait-time sum-exec sum-sleep\n"); 568 SEQ_printf(m, "-------------------------------------------------------" 569 "------------------------------------------------------\n"); 570 571 rcu_read_lock(); 572 for_each_process_thread(g, p) { 573 if (task_cpu(p) != rq_cpu) 574 continue; 575 576 print_task(m, rq, p); 577 } 578 rcu_read_unlock(); 579 } 580 581 void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq) 582 { 583 s64 MIN_vruntime = -1, min_vruntime, max_vruntime = -1, 584 spread, rq0_min_vruntime, spread0; 585 struct rq *rq = cpu_rq(cpu); 586 struct sched_entity *last; 587 unsigned long flags; 588 589 #ifdef CONFIG_FAIR_GROUP_SCHED 590 SEQ_printf(m, "\n"); 591 SEQ_printf_task_group_path(m, cfs_rq->tg, "cfs_rq[%d]:%s\n", cpu); 592 #else 593 SEQ_printf(m, "\n"); 594 SEQ_printf(m, "cfs_rq[%d]:\n", cpu); 595 #endif 596 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "exec_clock", 597 SPLIT_NS(cfs_rq->exec_clock)); 598 599 raw_spin_rq_lock_irqsave(rq, flags); 600 if (rb_first_cached(&cfs_rq->tasks_timeline)) 601 MIN_vruntime = (__pick_first_entity(cfs_rq))->vruntime; 602 last = __pick_last_entity(cfs_rq); 603 if (last) 604 max_vruntime = last->vruntime; 605 min_vruntime = cfs_rq->min_vruntime; 606 rq0_min_vruntime = cpu_rq(0)->cfs.min_vruntime; 607 raw_spin_rq_unlock_irqrestore(rq, flags); 608 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "MIN_vruntime", 609 SPLIT_NS(MIN_vruntime)); 610 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "min_vruntime", 611 SPLIT_NS(min_vruntime)); 612 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "max_vruntime", 613 SPLIT_NS(max_vruntime)); 614 spread = max_vruntime - MIN_vruntime; 615 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "spread", 616 SPLIT_NS(spread)); 617 spread0 = min_vruntime - rq0_min_vruntime; 618 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "spread0", 619 SPLIT_NS(spread0)); 620 SEQ_printf(m, " .%-30s: %d\n", "nr_spread_over", 621 cfs_rq->nr_spread_over); 622 SEQ_printf(m, " .%-30s: %d\n", "nr_running", cfs_rq->nr_running); 623 SEQ_printf(m, " .%-30s: %d\n", "h_nr_running", cfs_rq->h_nr_running); 624 SEQ_printf(m, " .%-30s: %d\n", "idle_nr_running", 625 cfs_rq->idle_nr_running); 626 SEQ_printf(m, " .%-30s: %d\n", "idle_h_nr_running", 627 cfs_rq->idle_h_nr_running); 628 SEQ_printf(m, " .%-30s: %ld\n", "load", cfs_rq->load.weight); 629 #ifdef CONFIG_SMP 630 SEQ_printf(m, " .%-30s: %lu\n", "load_avg", 631 cfs_rq->avg.load_avg); 632 SEQ_printf(m, " .%-30s: %lu\n", "runnable_avg", 633 cfs_rq->avg.runnable_avg); 634 SEQ_printf(m, " .%-30s: %lu\n", "util_avg", 635 cfs_rq->avg.util_avg); 636 SEQ_printf(m, " .%-30s: %u\n", "util_est_enqueued", 637 cfs_rq->avg.util_est.enqueued); 638 SEQ_printf(m, " .%-30s: %ld\n", "removed.load_avg", 639 cfs_rq->removed.load_avg); 640 SEQ_printf(m, " .%-30s: %ld\n", "removed.util_avg", 641 cfs_rq->removed.util_avg); 642 SEQ_printf(m, " .%-30s: %ld\n", "removed.runnable_avg", 643 cfs_rq->removed.runnable_avg); 644 #ifdef CONFIG_FAIR_GROUP_SCHED 645 SEQ_printf(m, " .%-30s: %lu\n", "tg_load_avg_contrib", 646 cfs_rq->tg_load_avg_contrib); 647 SEQ_printf(m, " .%-30s: %ld\n", "tg_load_avg", 648 atomic_long_read(&cfs_rq->tg->load_avg)); 649 #endif 650 #endif 651 #ifdef CONFIG_CFS_BANDWIDTH 652 SEQ_printf(m, " .%-30s: %d\n", "throttled", 653 cfs_rq->throttled); 654 SEQ_printf(m, " .%-30s: %d\n", "throttle_count", 655 cfs_rq->throttle_count); 656 #endif 657 658 #ifdef CONFIG_FAIR_GROUP_SCHED 659 print_cfs_group_stats(m, cpu, cfs_rq->tg); 660 #endif 661 } 662 663 void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq) 664 { 665 #ifdef CONFIG_RT_GROUP_SCHED 666 SEQ_printf(m, "\n"); 667 SEQ_printf_task_group_path(m, rt_rq->tg, "rt_rq[%d]:%s\n", cpu); 668 #else 669 SEQ_printf(m, "\n"); 670 SEQ_printf(m, "rt_rq[%d]:\n", cpu); 671 #endif 672 673 #define P(x) \ 674 SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rt_rq->x)) 675 #define PU(x) \ 676 SEQ_printf(m, " .%-30s: %lu\n", #x, (unsigned long)(rt_rq->x)) 677 #define PN(x) \ 678 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rt_rq->x)) 679 680 PU(rt_nr_running); 681 #ifdef CONFIG_SMP 682 PU(rt_nr_migratory); 683 #endif 684 P(rt_throttled); 685 PN(rt_time); 686 PN(rt_runtime); 687 688 #undef PN 689 #undef PU 690 #undef P 691 } 692 693 void print_dl_rq(struct seq_file *m, int cpu, struct dl_rq *dl_rq) 694 { 695 struct dl_bw *dl_bw; 696 697 SEQ_printf(m, "\n"); 698 SEQ_printf(m, "dl_rq[%d]:\n", cpu); 699 700 #define PU(x) \ 701 SEQ_printf(m, " .%-30s: %lu\n", #x, (unsigned long)(dl_rq->x)) 702 703 PU(dl_nr_running); 704 #ifdef CONFIG_SMP 705 PU(dl_nr_migratory); 706 dl_bw = &cpu_rq(cpu)->rd->dl_bw; 707 #else 708 dl_bw = &dl_rq->dl_bw; 709 #endif 710 SEQ_printf(m, " .%-30s: %lld\n", "dl_bw->bw", dl_bw->bw); 711 SEQ_printf(m, " .%-30s: %lld\n", "dl_bw->total_bw", dl_bw->total_bw); 712 713 #undef PU 714 } 715 716 static void print_cpu(struct seq_file *m, int cpu) 717 { 718 struct rq *rq = cpu_rq(cpu); 719 720 #ifdef CONFIG_X86 721 { 722 unsigned int freq = cpu_khz ? : 1; 723 724 SEQ_printf(m, "cpu#%d, %u.%03u MHz\n", 725 cpu, freq / 1000, (freq % 1000)); 726 } 727 #else 728 SEQ_printf(m, "cpu#%d\n", cpu); 729 #endif 730 731 #define P(x) \ 732 do { \ 733 if (sizeof(rq->x) == 4) \ 734 SEQ_printf(m, " .%-30s: %ld\n", #x, (long)(rq->x)); \ 735 else \ 736 SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rq->x));\ 737 } while (0) 738 739 #define PN(x) \ 740 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rq->x)) 741 742 P(nr_running); 743 P(nr_switches); 744 P(nr_uninterruptible); 745 PN(next_balance); 746 SEQ_printf(m, " .%-30s: %ld\n", "curr->pid", (long)(task_pid_nr(rq->curr))); 747 PN(clock); 748 PN(clock_task); 749 #undef P 750 #undef PN 751 752 #ifdef CONFIG_SMP 753 #define P64(n) SEQ_printf(m, " .%-30s: %Ld\n", #n, rq->n); 754 P64(avg_idle); 755 P64(max_idle_balance_cost); 756 #undef P64 757 #endif 758 759 #define P(n) SEQ_printf(m, " .%-30s: %d\n", #n, schedstat_val(rq->n)); 760 if (schedstat_enabled()) { 761 P(yld_count); 762 P(sched_count); 763 P(sched_goidle); 764 P(ttwu_count); 765 P(ttwu_local); 766 } 767 #undef P 768 769 print_cfs_stats(m, cpu); 770 print_rt_stats(m, cpu); 771 print_dl_stats(m, cpu); 772 773 print_rq(m, rq, cpu); 774 SEQ_printf(m, "\n"); 775 } 776 777 static const char *sched_tunable_scaling_names[] = { 778 "none", 779 "logarithmic", 780 "linear" 781 }; 782 783 static void sched_debug_header(struct seq_file *m) 784 { 785 u64 ktime, sched_clk, cpu_clk; 786 unsigned long flags; 787 788 local_irq_save(flags); 789 ktime = ktime_to_ns(ktime_get()); 790 sched_clk = sched_clock(); 791 cpu_clk = local_clock(); 792 local_irq_restore(flags); 793 794 SEQ_printf(m, "Sched Debug Version: v0.11, %s %.*s\n", 795 init_utsname()->release, 796 (int)strcspn(init_utsname()->version, " "), 797 init_utsname()->version); 798 799 #define P(x) \ 800 SEQ_printf(m, "%-40s: %Ld\n", #x, (long long)(x)) 801 #define PN(x) \ 802 SEQ_printf(m, "%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x)) 803 PN(ktime); 804 PN(sched_clk); 805 PN(cpu_clk); 806 P(jiffies); 807 #ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK 808 P(sched_clock_stable()); 809 #endif 810 #undef PN 811 #undef P 812 813 SEQ_printf(m, "\n"); 814 SEQ_printf(m, "sysctl_sched\n"); 815 816 #define P(x) \ 817 SEQ_printf(m, " .%-40s: %Ld\n", #x, (long long)(x)) 818 #define PN(x) \ 819 SEQ_printf(m, " .%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x)) 820 PN(sysctl_sched_latency); 821 PN(sysctl_sched_min_granularity); 822 PN(sysctl_sched_idle_min_granularity); 823 PN(sysctl_sched_wakeup_granularity); 824 P(sysctl_sched_child_runs_first); 825 P(sysctl_sched_features); 826 #undef PN 827 #undef P 828 829 SEQ_printf(m, " .%-40s: %d (%s)\n", 830 "sysctl_sched_tunable_scaling", 831 sysctl_sched_tunable_scaling, 832 sched_tunable_scaling_names[sysctl_sched_tunable_scaling]); 833 SEQ_printf(m, "\n"); 834 } 835 836 static int sched_debug_show(struct seq_file *m, void *v) 837 { 838 int cpu = (unsigned long)(v - 2); 839 840 if (cpu != -1) 841 print_cpu(m, cpu); 842 else 843 sched_debug_header(m); 844 845 return 0; 846 } 847 848 void sysrq_sched_debug_show(void) 849 { 850 int cpu; 851 852 sched_debug_header(NULL); 853 for_each_online_cpu(cpu) { 854 /* 855 * Need to reset softlockup watchdogs on all CPUs, because 856 * another CPU might be blocked waiting for us to process 857 * an IPI or stop_machine. 858 */ 859 touch_nmi_watchdog(); 860 touch_all_softlockup_watchdogs(); 861 print_cpu(NULL, cpu); 862 } 863 } 864 865 /* 866 * This iterator needs some explanation. 867 * It returns 1 for the header position. 868 * This means 2 is CPU 0. 869 * In a hotplugged system some CPUs, including CPU 0, may be missing so we have 870 * to use cpumask_* to iterate over the CPUs. 871 */ 872 static void *sched_debug_start(struct seq_file *file, loff_t *offset) 873 { 874 unsigned long n = *offset; 875 876 if (n == 0) 877 return (void *) 1; 878 879 n--; 880 881 if (n > 0) 882 n = cpumask_next(n - 1, cpu_online_mask); 883 else 884 n = cpumask_first(cpu_online_mask); 885 886 *offset = n + 1; 887 888 if (n < nr_cpu_ids) 889 return (void *)(unsigned long)(n + 2); 890 891 return NULL; 892 } 893 894 static void *sched_debug_next(struct seq_file *file, void *data, loff_t *offset) 895 { 896 (*offset)++; 897 return sched_debug_start(file, offset); 898 } 899 900 static void sched_debug_stop(struct seq_file *file, void *data) 901 { 902 } 903 904 static const struct seq_operations sched_debug_sops = { 905 .start = sched_debug_start, 906 .next = sched_debug_next, 907 .stop = sched_debug_stop, 908 .show = sched_debug_show, 909 }; 910 911 #define __PS(S, F) SEQ_printf(m, "%-45s:%21Ld\n", S, (long long)(F)) 912 #define __P(F) __PS(#F, F) 913 #define P(F) __PS(#F, p->F) 914 #define PM(F, M) __PS(#F, p->F & (M)) 915 #define __PSN(S, F) SEQ_printf(m, "%-45s:%14Ld.%06ld\n", S, SPLIT_NS((long long)(F))) 916 #define __PN(F) __PSN(#F, F) 917 #define PN(F) __PSN(#F, p->F) 918 919 920 #ifdef CONFIG_NUMA_BALANCING 921 void print_numa_stats(struct seq_file *m, int node, unsigned long tsf, 922 unsigned long tpf, unsigned long gsf, unsigned long gpf) 923 { 924 SEQ_printf(m, "numa_faults node=%d ", node); 925 SEQ_printf(m, "task_private=%lu task_shared=%lu ", tpf, tsf); 926 SEQ_printf(m, "group_private=%lu group_shared=%lu\n", gpf, gsf); 927 } 928 #endif 929 930 931 static void sched_show_numa(struct task_struct *p, struct seq_file *m) 932 { 933 #ifdef CONFIG_NUMA_BALANCING 934 if (p->mm) 935 P(mm->numa_scan_seq); 936 937 P(numa_pages_migrated); 938 P(numa_preferred_nid); 939 P(total_numa_faults); 940 SEQ_printf(m, "current_node=%d, numa_group_id=%d\n", 941 task_node(p), task_numa_group_id(p)); 942 show_numa_stats(p, m); 943 #endif 944 } 945 946 void proc_sched_show_task(struct task_struct *p, struct pid_namespace *ns, 947 struct seq_file *m) 948 { 949 unsigned long nr_switches; 950 951 SEQ_printf(m, "%s (%d, #threads: %d)\n", p->comm, task_pid_nr_ns(p, ns), 952 get_nr_threads(p)); 953 SEQ_printf(m, 954 "---------------------------------------------------------" 955 "----------\n"); 956 957 #define P_SCHEDSTAT(F) __PS(#F, schedstat_val(p->stats.F)) 958 #define PN_SCHEDSTAT(F) __PSN(#F, schedstat_val(p->stats.F)) 959 960 PN(se.exec_start); 961 PN(se.vruntime); 962 PN(se.sum_exec_runtime); 963 964 nr_switches = p->nvcsw + p->nivcsw; 965 966 P(se.nr_migrations); 967 968 if (schedstat_enabled()) { 969 u64 avg_atom, avg_per_cpu; 970 971 PN_SCHEDSTAT(sum_sleep_runtime); 972 PN_SCHEDSTAT(sum_block_runtime); 973 PN_SCHEDSTAT(wait_start); 974 PN_SCHEDSTAT(sleep_start); 975 PN_SCHEDSTAT(block_start); 976 PN_SCHEDSTAT(sleep_max); 977 PN_SCHEDSTAT(block_max); 978 PN_SCHEDSTAT(exec_max); 979 PN_SCHEDSTAT(slice_max); 980 PN_SCHEDSTAT(wait_max); 981 PN_SCHEDSTAT(wait_sum); 982 P_SCHEDSTAT(wait_count); 983 PN_SCHEDSTAT(iowait_sum); 984 P_SCHEDSTAT(iowait_count); 985 P_SCHEDSTAT(nr_migrations_cold); 986 P_SCHEDSTAT(nr_failed_migrations_affine); 987 P_SCHEDSTAT(nr_failed_migrations_running); 988 P_SCHEDSTAT(nr_failed_migrations_hot); 989 P_SCHEDSTAT(nr_forced_migrations); 990 P_SCHEDSTAT(nr_wakeups); 991 P_SCHEDSTAT(nr_wakeups_sync); 992 P_SCHEDSTAT(nr_wakeups_migrate); 993 P_SCHEDSTAT(nr_wakeups_local); 994 P_SCHEDSTAT(nr_wakeups_remote); 995 P_SCHEDSTAT(nr_wakeups_affine); 996 P_SCHEDSTAT(nr_wakeups_affine_attempts); 997 P_SCHEDSTAT(nr_wakeups_passive); 998 P_SCHEDSTAT(nr_wakeups_idle); 999 1000 avg_atom = p->se.sum_exec_runtime; 1001 if (nr_switches) 1002 avg_atom = div64_ul(avg_atom, nr_switches); 1003 else 1004 avg_atom = -1LL; 1005 1006 avg_per_cpu = p->se.sum_exec_runtime; 1007 if (p->se.nr_migrations) { 1008 avg_per_cpu = div64_u64(avg_per_cpu, 1009 p->se.nr_migrations); 1010 } else { 1011 avg_per_cpu = -1LL; 1012 } 1013 1014 __PN(avg_atom); 1015 __PN(avg_per_cpu); 1016 1017 #ifdef CONFIG_SCHED_CORE 1018 PN_SCHEDSTAT(core_forceidle_sum); 1019 #endif 1020 } 1021 1022 __P(nr_switches); 1023 __PS("nr_voluntary_switches", p->nvcsw); 1024 __PS("nr_involuntary_switches", p->nivcsw); 1025 1026 P(se.load.weight); 1027 #ifdef CONFIG_SMP 1028 P(se.avg.load_sum); 1029 P(se.avg.runnable_sum); 1030 P(se.avg.util_sum); 1031 P(se.avg.load_avg); 1032 P(se.avg.runnable_avg); 1033 P(se.avg.util_avg); 1034 P(se.avg.last_update_time); 1035 P(se.avg.util_est.ewma); 1036 PM(se.avg.util_est.enqueued, ~UTIL_AVG_UNCHANGED); 1037 #endif 1038 #ifdef CONFIG_UCLAMP_TASK 1039 __PS("uclamp.min", p->uclamp_req[UCLAMP_MIN].value); 1040 __PS("uclamp.max", p->uclamp_req[UCLAMP_MAX].value); 1041 __PS("effective uclamp.min", uclamp_eff_value(p, UCLAMP_MIN)); 1042 __PS("effective uclamp.max", uclamp_eff_value(p, UCLAMP_MAX)); 1043 #endif 1044 P(policy); 1045 P(prio); 1046 if (task_has_dl_policy(p)) { 1047 P(dl.runtime); 1048 P(dl.deadline); 1049 } 1050 #undef PN_SCHEDSTAT 1051 #undef P_SCHEDSTAT 1052 1053 { 1054 unsigned int this_cpu = raw_smp_processor_id(); 1055 u64 t0, t1; 1056 1057 t0 = cpu_clock(this_cpu); 1058 t1 = cpu_clock(this_cpu); 1059 __PS("clock-delta", t1-t0); 1060 } 1061 1062 sched_show_numa(p, m); 1063 } 1064 1065 void proc_sched_set_task(struct task_struct *p) 1066 { 1067 #ifdef CONFIG_SCHEDSTATS 1068 memset(&p->stats, 0, sizeof(p->stats)); 1069 #endif 1070 } 1071 1072 void resched_latency_warn(int cpu, u64 latency) 1073 { 1074 static DEFINE_RATELIMIT_STATE(latency_check_ratelimit, 60 * 60 * HZ, 1); 1075 1076 WARN(__ratelimit(&latency_check_ratelimit), 1077 "sched: CPU %d need_resched set for > %llu ns (%d ticks) " 1078 "without schedule\n", 1079 cpu, latency, cpu_rq(cpu)->ticks_without_resched); 1080 } 1081