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TOMOYO Linux Cross Reference
Linux/kernel/sched/debug.c

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  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 

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