1 /* 2 * kernel/sched/debug.c 3 * 4 * Print the CFS rbtree 5 * 6 * Copyright(C) 2007, Red Hat, Inc., Ingo Molnar 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 */ 12 13 #include <linux/proc_fs.h> 14 #include <linux/sched.h> 15 #include <linux/seq_file.h> 16 #include <linux/kallsyms.h> 17 #include <linux/utsname.h> 18 #include <linux/mempolicy.h> 19 20 #include "sched.h" 21 22 static DEFINE_SPINLOCK(sched_debug_lock); 23 24 /* 25 * This allows printing both to /proc/sched_debug and 26 * to the console 27 */ 28 #define SEQ_printf(m, x...) \ 29 do { \ 30 if (m) \ 31 seq_printf(m, x); \ 32 else \ 33 printk(x); \ 34 } while (0) 35 36 /* 37 * Ease the printing of nsec fields: 38 */ 39 static long long nsec_high(unsigned long long nsec) 40 { 41 if ((long long)nsec < 0) { 42 nsec = -nsec; 43 do_div(nsec, 1000000); 44 return -nsec; 45 } 46 do_div(nsec, 1000000); 47 48 return nsec; 49 } 50 51 static unsigned long nsec_low(unsigned long long nsec) 52 { 53 if ((long long)nsec < 0) 54 nsec = -nsec; 55 56 return do_div(nsec, 1000000); 57 } 58 59 #define SPLIT_NS(x) nsec_high(x), nsec_low(x) 60 61 #ifdef CONFIG_FAIR_GROUP_SCHED 62 static void print_cfs_group_stats(struct seq_file *m, int cpu, struct task_group *tg) 63 { 64 struct sched_entity *se = tg->se[cpu]; 65 66 #define P(F) \ 67 SEQ_printf(m, " .%-30s: %lld\n", #F, (long long)F) 68 #define PN(F) \ 69 SEQ_printf(m, " .%-30s: %lld.%06ld\n", #F, SPLIT_NS((long long)F)) 70 71 if (!se) { 72 struct sched_avg *avg = &cpu_rq(cpu)->avg; 73 P(avg->runnable_avg_sum); 74 P(avg->runnable_avg_period); 75 return; 76 } 77 78 79 PN(se->exec_start); 80 PN(se->vruntime); 81 PN(se->sum_exec_runtime); 82 #ifdef CONFIG_SCHEDSTATS 83 PN(se->statistics.wait_start); 84 PN(se->statistics.sleep_start); 85 PN(se->statistics.block_start); 86 PN(se->statistics.sleep_max); 87 PN(se->statistics.block_max); 88 PN(se->statistics.exec_max); 89 PN(se->statistics.slice_max); 90 PN(se->statistics.wait_max); 91 PN(se->statistics.wait_sum); 92 P(se->statistics.wait_count); 93 #endif 94 P(se->load.weight); 95 #ifdef CONFIG_SMP 96 P(se->avg.runnable_avg_sum); 97 P(se->avg.runnable_avg_period); 98 P(se->avg.load_avg_contrib); 99 P(se->avg.decay_count); 100 #endif 101 #undef PN 102 #undef P 103 } 104 #endif 105 106 #ifdef CONFIG_CGROUP_SCHED 107 static char group_path[PATH_MAX]; 108 109 static char *task_group_path(struct task_group *tg) 110 { 111 if (autogroup_path(tg, group_path, PATH_MAX)) 112 return group_path; 113 114 return cgroup_path(tg->css.cgroup, group_path, PATH_MAX); 115 } 116 #endif 117 118 static void 119 print_task(struct seq_file *m, struct rq *rq, struct task_struct *p) 120 { 121 if (rq->curr == p) 122 SEQ_printf(m, "R"); 123 else 124 SEQ_printf(m, " "); 125 126 SEQ_printf(m, "%15s %5d %9Ld.%06ld %9Ld %5d ", 127 p->comm, task_pid_nr(p), 128 SPLIT_NS(p->se.vruntime), 129 (long long)(p->nvcsw + p->nivcsw), 130 p->prio); 131 #ifdef CONFIG_SCHEDSTATS 132 SEQ_printf(m, "%9Ld.%06ld %9Ld.%06ld %9Ld.%06ld", 133 SPLIT_NS(p->se.vruntime), 134 SPLIT_NS(p->se.sum_exec_runtime), 135 SPLIT_NS(p->se.statistics.sum_sleep_runtime)); 136 #else 137 SEQ_printf(m, "%15Ld %15Ld %15Ld.%06ld %15Ld.%06ld %15Ld.%06ld", 138 0LL, 0LL, 0LL, 0L, 0LL, 0L, 0LL, 0L); 139 #endif 140 #ifdef CONFIG_NUMA_BALANCING 141 SEQ_printf(m, " %d", task_node(p)); 142 #endif 143 #ifdef CONFIG_CGROUP_SCHED 144 SEQ_printf(m, " %s", task_group_path(task_group(p))); 145 #endif 146 147 SEQ_printf(m, "\n"); 148 } 149 150 static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu) 151 { 152 struct task_struct *g, *p; 153 154 SEQ_printf(m, 155 "\nrunnable tasks:\n" 156 " task PID tree-key switches prio" 157 " exec-runtime sum-exec sum-sleep\n" 158 "------------------------------------------------------" 159 "----------------------------------------------------\n"); 160 161 rcu_read_lock(); 162 for_each_process_thread(g, p) { 163 if (task_cpu(p) != rq_cpu) 164 continue; 165 166 print_task(m, rq, p); 167 } 168 rcu_read_unlock(); 169 } 170 171 void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq) 172 { 173 s64 MIN_vruntime = -1, min_vruntime, max_vruntime = -1, 174 spread, rq0_min_vruntime, spread0; 175 struct rq *rq = cpu_rq(cpu); 176 struct sched_entity *last; 177 unsigned long flags; 178 179 #ifdef CONFIG_FAIR_GROUP_SCHED 180 SEQ_printf(m, "\ncfs_rq[%d]:%s\n", cpu, task_group_path(cfs_rq->tg)); 181 #else 182 SEQ_printf(m, "\ncfs_rq[%d]:\n", cpu); 183 #endif 184 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "exec_clock", 185 SPLIT_NS(cfs_rq->exec_clock)); 186 187 raw_spin_lock_irqsave(&rq->lock, flags); 188 if (cfs_rq->rb_leftmost) 189 MIN_vruntime = (__pick_first_entity(cfs_rq))->vruntime; 190 last = __pick_last_entity(cfs_rq); 191 if (last) 192 max_vruntime = last->vruntime; 193 min_vruntime = cfs_rq->min_vruntime; 194 rq0_min_vruntime = cpu_rq(0)->cfs.min_vruntime; 195 raw_spin_unlock_irqrestore(&rq->lock, flags); 196 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "MIN_vruntime", 197 SPLIT_NS(MIN_vruntime)); 198 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "min_vruntime", 199 SPLIT_NS(min_vruntime)); 200 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "max_vruntime", 201 SPLIT_NS(max_vruntime)); 202 spread = max_vruntime - MIN_vruntime; 203 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "spread", 204 SPLIT_NS(spread)); 205 spread0 = min_vruntime - rq0_min_vruntime; 206 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "spread0", 207 SPLIT_NS(spread0)); 208 SEQ_printf(m, " .%-30s: %d\n", "nr_spread_over", 209 cfs_rq->nr_spread_over); 210 SEQ_printf(m, " .%-30s: %d\n", "nr_running", cfs_rq->nr_running); 211 SEQ_printf(m, " .%-30s: %ld\n", "load", cfs_rq->load.weight); 212 #ifdef CONFIG_SMP 213 SEQ_printf(m, " .%-30s: %ld\n", "runnable_load_avg", 214 cfs_rq->runnable_load_avg); 215 SEQ_printf(m, " .%-30s: %ld\n", "blocked_load_avg", 216 cfs_rq->blocked_load_avg); 217 #ifdef CONFIG_FAIR_GROUP_SCHED 218 SEQ_printf(m, " .%-30s: %ld\n", "tg_load_contrib", 219 cfs_rq->tg_load_contrib); 220 SEQ_printf(m, " .%-30s: %d\n", "tg_runnable_contrib", 221 cfs_rq->tg_runnable_contrib); 222 SEQ_printf(m, " .%-30s: %ld\n", "tg_load_avg", 223 atomic_long_read(&cfs_rq->tg->load_avg)); 224 SEQ_printf(m, " .%-30s: %d\n", "tg->runnable_avg", 225 atomic_read(&cfs_rq->tg->runnable_avg)); 226 #endif 227 #endif 228 #ifdef CONFIG_CFS_BANDWIDTH 229 SEQ_printf(m, " .%-30s: %d\n", "tg->cfs_bandwidth.timer_active", 230 cfs_rq->tg->cfs_bandwidth.timer_active); 231 SEQ_printf(m, " .%-30s: %d\n", "throttled", 232 cfs_rq->throttled); 233 SEQ_printf(m, " .%-30s: %d\n", "throttle_count", 234 cfs_rq->throttle_count); 235 #endif 236 237 #ifdef CONFIG_FAIR_GROUP_SCHED 238 print_cfs_group_stats(m, cpu, cfs_rq->tg); 239 #endif 240 } 241 242 void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq) 243 { 244 #ifdef CONFIG_RT_GROUP_SCHED 245 SEQ_printf(m, "\nrt_rq[%d]:%s\n", cpu, task_group_path(rt_rq->tg)); 246 #else 247 SEQ_printf(m, "\nrt_rq[%d]:\n", cpu); 248 #endif 249 250 #define P(x) \ 251 SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rt_rq->x)) 252 #define PN(x) \ 253 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rt_rq->x)) 254 255 P(rt_nr_running); 256 P(rt_throttled); 257 PN(rt_time); 258 PN(rt_runtime); 259 260 #undef PN 261 #undef P 262 } 263 264 extern __read_mostly int sched_clock_running; 265 266 static void print_cpu(struct seq_file *m, int cpu) 267 { 268 struct rq *rq = cpu_rq(cpu); 269 unsigned long flags; 270 271 #ifdef CONFIG_X86 272 { 273 unsigned int freq = cpu_khz ? : 1; 274 275 SEQ_printf(m, "cpu#%d, %u.%03u MHz\n", 276 cpu, freq / 1000, (freq % 1000)); 277 } 278 #else 279 SEQ_printf(m, "cpu#%d\n", cpu); 280 #endif 281 282 #define P(x) \ 283 do { \ 284 if (sizeof(rq->x) == 4) \ 285 SEQ_printf(m, " .%-30s: %ld\n", #x, (long)(rq->x)); \ 286 else \ 287 SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rq->x));\ 288 } while (0) 289 290 #define PN(x) \ 291 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rq->x)) 292 293 P(nr_running); 294 SEQ_printf(m, " .%-30s: %lu\n", "load", 295 rq->load.weight); 296 P(nr_switches); 297 P(nr_load_updates); 298 P(nr_uninterruptible); 299 PN(next_balance); 300 SEQ_printf(m, " .%-30s: %ld\n", "curr->pid", (long)(task_pid_nr(rq->curr))); 301 PN(clock); 302 P(cpu_load[0]); 303 P(cpu_load[1]); 304 P(cpu_load[2]); 305 P(cpu_load[3]); 306 P(cpu_load[4]); 307 #undef P 308 #undef PN 309 310 #ifdef CONFIG_SCHEDSTATS 311 #define P(n) SEQ_printf(m, " .%-30s: %d\n", #n, rq->n); 312 #define P64(n) SEQ_printf(m, " .%-30s: %Ld\n", #n, rq->n); 313 314 P(yld_count); 315 316 P(sched_count); 317 P(sched_goidle); 318 #ifdef CONFIG_SMP 319 P64(avg_idle); 320 P64(max_idle_balance_cost); 321 #endif 322 323 P(ttwu_count); 324 P(ttwu_local); 325 326 #undef P 327 #undef P64 328 #endif 329 spin_lock_irqsave(&sched_debug_lock, flags); 330 print_cfs_stats(m, cpu); 331 print_rt_stats(m, cpu); 332 333 print_rq(m, rq, cpu); 334 spin_unlock_irqrestore(&sched_debug_lock, flags); 335 SEQ_printf(m, "\n"); 336 } 337 338 static const char *sched_tunable_scaling_names[] = { 339 "none", 340 "logaritmic", 341 "linear" 342 }; 343 344 static void sched_debug_header(struct seq_file *m) 345 { 346 u64 ktime, sched_clk, cpu_clk; 347 unsigned long flags; 348 349 local_irq_save(flags); 350 ktime = ktime_to_ns(ktime_get()); 351 sched_clk = sched_clock(); 352 cpu_clk = local_clock(); 353 local_irq_restore(flags); 354 355 SEQ_printf(m, "Sched Debug Version: v0.11, %s %.*s\n", 356 init_utsname()->release, 357 (int)strcspn(init_utsname()->version, " "), 358 init_utsname()->version); 359 360 #define P(x) \ 361 SEQ_printf(m, "%-40s: %Ld\n", #x, (long long)(x)) 362 #define PN(x) \ 363 SEQ_printf(m, "%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x)) 364 PN(ktime); 365 PN(sched_clk); 366 PN(cpu_clk); 367 P(jiffies); 368 #ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK 369 P(sched_clock_stable()); 370 #endif 371 #undef PN 372 #undef P 373 374 SEQ_printf(m, "\n"); 375 SEQ_printf(m, "sysctl_sched\n"); 376 377 #define P(x) \ 378 SEQ_printf(m, " .%-40s: %Ld\n", #x, (long long)(x)) 379 #define PN(x) \ 380 SEQ_printf(m, " .%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x)) 381 PN(sysctl_sched_latency); 382 PN(sysctl_sched_min_granularity); 383 PN(sysctl_sched_wakeup_granularity); 384 P(sysctl_sched_child_runs_first); 385 P(sysctl_sched_features); 386 #undef PN 387 #undef P 388 389 SEQ_printf(m, " .%-40s: %d (%s)\n", 390 "sysctl_sched_tunable_scaling", 391 sysctl_sched_tunable_scaling, 392 sched_tunable_scaling_names[sysctl_sched_tunable_scaling]); 393 SEQ_printf(m, "\n"); 394 } 395 396 static int sched_debug_show(struct seq_file *m, void *v) 397 { 398 int cpu = (unsigned long)(v - 2); 399 400 if (cpu != -1) 401 print_cpu(m, cpu); 402 else 403 sched_debug_header(m); 404 405 return 0; 406 } 407 408 void sysrq_sched_debug_show(void) 409 { 410 int cpu; 411 412 sched_debug_header(NULL); 413 for_each_online_cpu(cpu) 414 print_cpu(NULL, cpu); 415 416 } 417 418 /* 419 * This itererator needs some explanation. 420 * It returns 1 for the header position. 421 * This means 2 is cpu 0. 422 * In a hotplugged system some cpus, including cpu 0, may be missing so we have 423 * to use cpumask_* to iterate over the cpus. 424 */ 425 static void *sched_debug_start(struct seq_file *file, loff_t *offset) 426 { 427 unsigned long n = *offset; 428 429 if (n == 0) 430 return (void *) 1; 431 432 n--; 433 434 if (n > 0) 435 n = cpumask_next(n - 1, cpu_online_mask); 436 else 437 n = cpumask_first(cpu_online_mask); 438 439 *offset = n + 1; 440 441 if (n < nr_cpu_ids) 442 return (void *)(unsigned long)(n + 2); 443 return NULL; 444 } 445 446 static void *sched_debug_next(struct seq_file *file, void *data, loff_t *offset) 447 { 448 (*offset)++; 449 return sched_debug_start(file, offset); 450 } 451 452 static void sched_debug_stop(struct seq_file *file, void *data) 453 { 454 } 455 456 static const struct seq_operations sched_debug_sops = { 457 .start = sched_debug_start, 458 .next = sched_debug_next, 459 .stop = sched_debug_stop, 460 .show = sched_debug_show, 461 }; 462 463 static int sched_debug_release(struct inode *inode, struct file *file) 464 { 465 seq_release(inode, file); 466 467 return 0; 468 } 469 470 static int sched_debug_open(struct inode *inode, struct file *filp) 471 { 472 int ret = 0; 473 474 ret = seq_open(filp, &sched_debug_sops); 475 476 return ret; 477 } 478 479 static const struct file_operations sched_debug_fops = { 480 .open = sched_debug_open, 481 .read = seq_read, 482 .llseek = seq_lseek, 483 .release = sched_debug_release, 484 }; 485 486 static int __init init_sched_debug_procfs(void) 487 { 488 struct proc_dir_entry *pe; 489 490 pe = proc_create("sched_debug", 0444, NULL, &sched_debug_fops); 491 if (!pe) 492 return -ENOMEM; 493 return 0; 494 } 495 496 __initcall(init_sched_debug_procfs); 497 498 #define __P(F) \ 499 SEQ_printf(m, "%-45s:%21Ld\n", #F, (long long)F) 500 #define P(F) \ 501 SEQ_printf(m, "%-45s:%21Ld\n", #F, (long long)p->F) 502 #define __PN(F) \ 503 SEQ_printf(m, "%-45s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)F)) 504 #define PN(F) \ 505 SEQ_printf(m, "%-45s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)p->F)) 506 507 508 static void sched_show_numa(struct task_struct *p, struct seq_file *m) 509 { 510 #ifdef CONFIG_NUMA_BALANCING 511 struct mempolicy *pol; 512 int node, i; 513 514 if (p->mm) 515 P(mm->numa_scan_seq); 516 517 task_lock(p); 518 pol = p->mempolicy; 519 if (pol && !(pol->flags & MPOL_F_MORON)) 520 pol = NULL; 521 mpol_get(pol); 522 task_unlock(p); 523 524 SEQ_printf(m, "numa_migrations, %ld\n", xchg(&p->numa_pages_migrated, 0)); 525 526 for_each_online_node(node) { 527 for (i = 0; i < 2; i++) { 528 unsigned long nr_faults = -1; 529 int cpu_current, home_node; 530 531 if (p->numa_faults_memory) 532 nr_faults = p->numa_faults_memory[2*node + i]; 533 534 cpu_current = !i ? (task_node(p) == node) : 535 (pol && node_isset(node, pol->v.nodes)); 536 537 home_node = (p->numa_preferred_nid == node); 538 539 SEQ_printf(m, "numa_faults_memory, %d, %d, %d, %d, %ld\n", 540 i, node, cpu_current, home_node, nr_faults); 541 } 542 } 543 544 mpol_put(pol); 545 #endif 546 } 547 548 void proc_sched_show_task(struct task_struct *p, struct seq_file *m) 549 { 550 unsigned long nr_switches; 551 552 SEQ_printf(m, "%s (%d, #threads: %d)\n", p->comm, task_pid_nr(p), 553 get_nr_threads(p)); 554 SEQ_printf(m, 555 "---------------------------------------------------------" 556 "----------\n"); 557 #define __P(F) \ 558 SEQ_printf(m, "%-45s:%21Ld\n", #F, (long long)F) 559 #define P(F) \ 560 SEQ_printf(m, "%-45s:%21Ld\n", #F, (long long)p->F) 561 #define __PN(F) \ 562 SEQ_printf(m, "%-45s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)F)) 563 #define PN(F) \ 564 SEQ_printf(m, "%-45s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)p->F)) 565 566 PN(se.exec_start); 567 PN(se.vruntime); 568 PN(se.sum_exec_runtime); 569 570 nr_switches = p->nvcsw + p->nivcsw; 571 572 #ifdef CONFIG_SCHEDSTATS 573 PN(se.statistics.wait_start); 574 PN(se.statistics.sleep_start); 575 PN(se.statistics.block_start); 576 PN(se.statistics.sleep_max); 577 PN(se.statistics.block_max); 578 PN(se.statistics.exec_max); 579 PN(se.statistics.slice_max); 580 PN(se.statistics.wait_max); 581 PN(se.statistics.wait_sum); 582 P(se.statistics.wait_count); 583 PN(se.statistics.iowait_sum); 584 P(se.statistics.iowait_count); 585 P(se.nr_migrations); 586 P(se.statistics.nr_migrations_cold); 587 P(se.statistics.nr_failed_migrations_affine); 588 P(se.statistics.nr_failed_migrations_running); 589 P(se.statistics.nr_failed_migrations_hot); 590 P(se.statistics.nr_forced_migrations); 591 P(se.statistics.nr_wakeups); 592 P(se.statistics.nr_wakeups_sync); 593 P(se.statistics.nr_wakeups_migrate); 594 P(se.statistics.nr_wakeups_local); 595 P(se.statistics.nr_wakeups_remote); 596 P(se.statistics.nr_wakeups_affine); 597 P(se.statistics.nr_wakeups_affine_attempts); 598 P(se.statistics.nr_wakeups_passive); 599 P(se.statistics.nr_wakeups_idle); 600 601 { 602 u64 avg_atom, avg_per_cpu; 603 604 avg_atom = p->se.sum_exec_runtime; 605 if (nr_switches) 606 avg_atom = div64_ul(avg_atom, nr_switches); 607 else 608 avg_atom = -1LL; 609 610 avg_per_cpu = p->se.sum_exec_runtime; 611 if (p->se.nr_migrations) { 612 avg_per_cpu = div64_u64(avg_per_cpu, 613 p->se.nr_migrations); 614 } else { 615 avg_per_cpu = -1LL; 616 } 617 618 __PN(avg_atom); 619 __PN(avg_per_cpu); 620 } 621 #endif 622 __P(nr_switches); 623 SEQ_printf(m, "%-45s:%21Ld\n", 624 "nr_voluntary_switches", (long long)p->nvcsw); 625 SEQ_printf(m, "%-45s:%21Ld\n", 626 "nr_involuntary_switches", (long long)p->nivcsw); 627 628 P(se.load.weight); 629 #ifdef CONFIG_SMP 630 P(se.avg.runnable_avg_sum); 631 P(se.avg.runnable_avg_period); 632 P(se.avg.load_avg_contrib); 633 P(se.avg.decay_count); 634 #endif 635 P(policy); 636 P(prio); 637 #undef PN 638 #undef __PN 639 #undef P 640 #undef __P 641 642 { 643 unsigned int this_cpu = raw_smp_processor_id(); 644 u64 t0, t1; 645 646 t0 = cpu_clock(this_cpu); 647 t1 = cpu_clock(this_cpu); 648 SEQ_printf(m, "%-45s:%21Ld\n", 649 "clock-delta", (long long)(t1-t0)); 650 } 651 652 sched_show_numa(p, m); 653 } 654 655 void proc_sched_set_task(struct task_struct *p) 656 { 657 #ifdef CONFIG_SCHEDSTATS 658 memset(&p->se.statistics, 0, sizeof(p->se.statistics)); 659 #endif 660 } 661