kernel/sched_rt.c

   1 /*
   2  * Real-Time Scheduling Class (mapped to the SCHED_FIFO and SCHED_RR
   3  * policies)
   4  */
   5
   6 #ifdef CONFIG_SMP
   7 static cpumask_t rt_overload_mask;
   8 static atomic_t rto_count;
   9 static inline int rt_overloaded(void)
  10 {
  11         return atomic_read(&rto_count);
  12 }
  13 static inline cpumask_t *rt_overload(void)
  14 {
  15         return &rt_overload_mask;
  16 }
  17 static inline void rt_set_overload(struct rq *rq)
  18 {
  19         cpu_set(rq->cpu, rt_overload_mask);
  20         /*
  21          * Make sure the mask is visible before we set
  22          * the overload count. That is checked to determine
  23          * if we should look at the mask. It would be a shame
  24          * if we looked at the mask, but the mask was not
  25          * updated yet.
  26          */
  27         wmb();
  28         atomic_inc(&rto_count);
  29 }
  30 static inline void rt_clear_overload(struct rq *rq)
  31 {
  32         /* the order here really doesn't matter */
  33         atomic_dec(&rto_count);
  34         cpu_clear(rq->cpu, rt_overload_mask);
  35 }
  36
  37 static void update_rt_migration(struct rq *rq)
  38 {
  39         if (rq->rt.rt_nr_migratory && (rq->rt.rt_nr_running > 1))
  40                 rt_set_overload(rq);
  41         else
  42                 rt_clear_overload(rq);
  43 }
  44 #endif /* CONFIG_SMP */
  45
  46 /*
  47  * Update the current task's runtime statistics. Skip current tasks that
  48  * are not in our scheduling class.
  49  */
  50 static void update_curr_rt(struct rq *rq)
  51 {
  52         struct task_struct *curr = rq->curr;
  53         u64 delta_exec;
  54
  55         if (!task_has_rt_policy(curr))
  56                 return;
  57
  58         delta_exec = rq->clock - curr->se.exec_start;
  59         if (unlikely((s64)delta_exec < 0))
  60                 delta_exec = 0;
  61
  62         schedstat_set(curr->se.exec_max, max(curr->se.exec_max, delta_exec));
  63
  64         curr->se.sum_exec_runtime += delta_exec;
  65         curr->se.exec_start = rq->clock;
  66         cpuacct_charge(curr, delta_exec);
  67 }
  68
  69 static inline void inc_rt_tasks(struct task_struct *p, struct rq *rq)
  70 {
  71         WARN_ON(!rt_task(p));
  72         rq->rt.rt_nr_running++;
  73 #ifdef CONFIG_SMP
  74         if (p->prio < rq->rt.highest_prio)
  75                 rq->rt.highest_prio = p->prio;
  76         if (p->nr_cpus_allowed > 1)
  77                 rq->rt.rt_nr_migratory++;
  78
  79         update_rt_migration(rq);
  80 #endif /* CONFIG_SMP */
  81 }
  82
  83 static inline void dec_rt_tasks(struct task_struct *p, struct rq *rq)
  84 {
  85         WARN_ON(!rt_task(p));
  86         WARN_ON(!rq->rt.rt_nr_running);
  87         rq->rt.rt_nr_running--;
  88 #ifdef CONFIG_SMP
  89         if (rq->rt.rt_nr_running) {
  90                 struct rt_prio_array *array;
  91
  92                 WARN_ON(p->prio < rq->rt.highest_prio);
  93                 if (p->prio == rq->rt.highest_prio) {
  94                         /* recalculate */
  95                         array = &rq->rt.active;
  96                         rq->rt.highest_prio =
  97                                 sched_find_first_bit(array->bitmap);
  98                 } /* otherwise leave rq->highest prio alone */
  99         } else
 100                 rq->rt.highest_prio = MAX_RT_PRIO;
 101         if (p->nr_cpus_allowed > 1)
 102                 rq->rt.rt_nr_migratory--;
 103
 104         update_rt_migration(rq);
 105 #endif /* CONFIG_SMP */
 106 }
 107
 108 static void enqueue_task_rt(struct rq *rq, struct task_struct *p, int wakeup)
 109 {
 110         struct rt_prio_array *array = &rq->rt.active;
 111
 112         list_add_tail(&p->run_list, array->queue + p->prio);
 113         __set_bit(p->prio, array->bitmap);
 114         inc_cpu_load(rq, p->se.load.weight);
 115
 116         inc_rt_tasks(p, rq);
 117 }
 118
 119 /*
 120  * Adding/removing a task to/from a priority array:
 121  */
 122 static void dequeue_task_rt(struct rq *rq, struct task_struct *p, int sleep)
 123 {
 124         struct rt_prio_array *array = &rq->rt.active;
 125
 126         update_curr_rt(rq);
 127
 128         list_del(&p->run_list);
 129         if (list_empty(array->queue + p->prio))
 130                 __clear_bit(p->prio, array->bitmap);
 131         dec_cpu_load(rq, p->se.load.weight);
 132
 133         dec_rt_tasks(p, rq);
 134 }
 135
 136 /*
 137  * Put task to the end of the run list without the overhead of dequeue
 138  * followed by enqueue.
 139  */
 140 static void requeue_task_rt(struct rq *rq, struct task_struct *p)
 141 {
 142         struct rt_prio_array *array = &rq->rt.active;
 143
 144         list_move_tail(&p->run_list, array->queue + p->prio);
 145 }
 146
 147 static void
 148 yield_task_rt(struct rq *rq)
 149 {
 150         requeue_task_rt(rq, rq->curr);
 151 }
 152
 153 #ifdef CONFIG_SMP
 154 static int find_lowest_rq(struct task_struct *task);
 155
 156 static int select_task_rq_rt(struct task_struct *p, int sync)
 157 {
 158         struct rq *rq = task_rq(p);
 159
 160         /*
 161          * If the task will not preempt the RQ, try to find a better RQ
 162          * before we even activate the task
 163          */
 164         if ((p->prio >= rq->rt.highest_prio)
 165             && (p->nr_cpus_allowed > 1)) {
 166                 int cpu = find_lowest_rq(p);
 167
 168                 return (cpu == -1) ? task_cpu(p) : cpu;
 169         }
 170
 171         /*
 172          * Otherwise, just let it ride on the affined RQ and the
 173          * post-schedule router will push the preempted task away
 174          */
 175         return task_cpu(p);
 176 }
 177 #endif /* CONFIG_SMP */
 178
 179 /*
 180  * Preempt the current task with a newly woken task if needed:
 181  */
 182 static void check_preempt_curr_rt(struct rq *rq, struct task_struct *p)
 183 {
 184         if (p->prio < rq->curr->prio)
 185                 resched_task(rq->curr);
 186 }
 187
 188 static struct task_struct *pick_next_task_rt(struct rq *rq)
 189 {
 190         struct rt_prio_array *array = &rq->rt.active;
 191         struct task_struct *next;
 192         struct list_head *queue;
 193         int idx;
 194
 195         idx = sched_find_first_bit(array->bitmap);
 196         if (idx >= MAX_RT_PRIO)
 197                 return NULL;
 198
 199         queue = array->queue + idx;
 200         next = list_entry(queue->next, struct task_struct, run_list);
 201
 202         next->se.exec_start = rq->clock;
 203
 204         return next;
 205 }
 206
 207 static void put_prev_task_rt(struct rq *rq, struct task_struct *p)
 208 {
 209         update_curr_rt(rq);
 210         p->se.exec_start = 0;
 211 }
 212
 213 #ifdef CONFIG_SMP
 214 /* Only try algorithms three times */
 215 #define RT_MAX_TRIES 3
 216
 217 static int double_lock_balance(struct rq *this_rq, struct rq *busiest);
 218 static void deactivate_task(struct rq *rq, struct task_struct *p, int sleep);
 219
 220 static int pick_rt_task(struct rq *rq, struct task_struct *p, int cpu)
 221 {
 222         if (!task_running(rq, p) &&
 223             (cpu < 0 || cpu_isset(cpu, p->cpus_allowed)) &&
 224             (p->nr_cpus_allowed > 1))
 225                 return 1;
 226         return 0;
 227 }
 228
 229 /* Return the second highest RT task, NULL otherwise */
 230 static struct task_struct *pick_next_highest_task_rt(struct rq *rq,
 231                                                      int cpu)
 232 {
 233         struct rt_prio_array *array = &rq->rt.active;
 234         struct task_struct *next;
 235         struct list_head *queue;
 236         int idx;
 237
 238         assert_spin_locked(&rq->lock);
 239
 240         if (likely(rq->rt.rt_nr_running < 2))
 241                 return NULL;
 242
 243         idx = sched_find_first_bit(array->bitmap);
 244         if (unlikely(idx >= MAX_RT_PRIO)) {
 245                 WARN_ON(1); /* rt_nr_running is bad */
 246                 return NULL;
 247         }
 248
 249         queue = array->queue + idx;
 250         BUG_ON(list_empty(queue));
 251
 252         next = list_entry(queue->next, struct task_struct, run_list);
 253         if (unlikely(pick_rt_task(rq, next, cpu)))
 254                 goto out;
 255
 256         if (queue->next->next != queue) {
 257                 /* same prio task */
 258                 next = list_entry(queue->next->next, struct task_struct, run_list);
 259                 if (pick_rt_task(rq, next, cpu))
 260                         goto out;
 261         }
 262
 263  retry:
 264         /* slower, but more flexible */
 265         idx = find_next_bit(array->bitmap, MAX_RT_PRIO, idx+1);
 266         if (unlikely(idx >= MAX_RT_PRIO))
 267                 return NULL;
 268
 269         queue = array->queue + idx;
 270         BUG_ON(list_empty(queue));
 271
 272         list_for_each_entry(next, queue, run_list) {
 273                 if (pick_rt_task(rq, next, cpu))
 274                         goto out;
 275         }
 276
 277         goto retry;
 278
 279  out:
 280         return next;
 281 }
 282
 283 static DEFINE_PER_CPU(cpumask_t, local_cpu_mask);
 284
 285 static int find_lowest_rq(struct task_struct *task)
 286 {
 287         int cpu;
 288         cpumask_t *cpu_mask = &__get_cpu_var(local_cpu_mask);
 289         struct rq *lowest_rq = NULL;
 290
 291         cpus_and(*cpu_mask, cpu_online_map, task->cpus_allowed);
 292
 293         /*
 294          * Scan each rq for the lowest prio.
 295          */
 296         for_each_cpu_mask(cpu, *cpu_mask) {
 297                 struct rq *rq = cpu_rq(cpu);
 298
 299                 /* We look for lowest RT prio or non-rt CPU */
 300                 if (rq->rt.highest_prio >= MAX_RT_PRIO) {
 301                         lowest_rq = rq;
 302                         break;
 303                 }
 304
 305                 /* no locking for now */
 306                 if (rq->rt.highest_prio > task->prio &&
 307                     (!lowest_rq || rq->rt.highest_prio > lowest_rq->rt.highest_prio)) {
 308                         lowest_rq = rq;
 309                 }
 310         }
 311
 312         return lowest_rq ? lowest_rq->cpu : -1;
 313 }
 314
 315 /* Will lock the rq it finds */
 316 static struct rq *find_lock_lowest_rq(struct task_struct *task,
 317                                       struct rq *rq)
 318 {
 319         struct rq *lowest_rq = NULL;
 320         int cpu;
 321         int tries;
 322
 323         for (tries = 0; tries < RT_MAX_TRIES; tries++) {
 324                 cpu = find_lowest_rq(task);
 325
 326                 if ((cpu == -1) || (cpu == rq->cpu))
 327                         break;
 328
 329                 lowest_rq = cpu_rq(cpu);
 330
 331                 /* if the prio of this runqueue changed, try again */
 332                 if (double_lock_balance(rq, lowest_rq)) {
 333                         /*
 334                          * We had to unlock the run queue. In
 335                          * the mean time, task could have
 336                          * migrated already or had its affinity changed.
 337                          * Also make sure that it wasn't scheduled on its rq.
 338                          */
 339                         if (unlikely(task_rq(task) != rq ||
 340                                      !cpu_isset(lowest_rq->cpu, task->cpus_allowed) ||
 341                                      task_running(rq, task) ||
 342                                      !task->se.on_rq)) {
 343                                 spin_unlock(&lowest_rq->lock);
 344                                 lowest_rq = NULL;
 345                                 break;
 346                         }
 347                 }
 348
 349                 /* If this rq is still suitable use it. */
 350                 if (lowest_rq->rt.highest_prio > task->prio)
 351                         break;
 352
 353                 /* try again */
 354                 spin_unlock(&lowest_rq->lock);
 355                 lowest_rq = NULL;
 356         }
 357
 358         return lowest_rq;
 359 }
 360
 361 /*
 362  * If the current CPU has more than one RT task, see if the non
 363  * running task can migrate over to a CPU that is running a task
 364  * of lesser priority.
 365  */
 366 static int push_rt_task(struct rq *rq)
 367 {
 368         struct task_struct *next_task;
 369         struct rq *lowest_rq;
 370         int ret = 0;
 371         int paranoid = RT_MAX_TRIES;
 372
 373         assert_spin_locked(&rq->lock);
 374
 375         next_task = pick_next_highest_task_rt(rq, -1);
 376         if (!next_task)
 377                 return 0;
 378
 379  retry:
 380         if (unlikely(next_task == rq->curr)) {
 381                 WARN_ON(1);
 382                 return 0;
 383         }
 384
 385         /*
 386          * It's possible that the next_task slipped in of
 387          * higher priority than current. If that's the case
 388          * just reschedule current.
 389          */
 390         if (unlikely(next_task->prio < rq->curr->prio)) {
 391                 resched_task(rq->curr);
 392                 return 0;
 393         }
 394
 395         /* We might release rq lock */
 396         get_task_struct(next_task);
 397
 398         /* find_lock_lowest_rq locks the rq if found */
 399         lowest_rq = find_lock_lowest_rq(next_task, rq);
 400         if (!lowest_rq) {
 401                 struct task_struct *task;
 402                 /*
 403                  * find lock_lowest_rq releases rq->lock
 404                  * so it is possible that next_task has changed.
 405                  * If it has, then try again.
 406                  */
 407                 task = pick_next_highest_task_rt(rq, -1);
 408                 if (unlikely(task != next_task) && task && paranoid--) {
 409                         put_task_struct(next_task);
 410                         next_task = task;
 411                         goto retry;
 412                 }
 413                 goto out;
 414         }
 415
 416         assert_spin_locked(&lowest_rq->lock);
 417
 418         deactivate_task(rq, next_task, 0);
 419         set_task_cpu(next_task, lowest_rq->cpu);
 420         activate_task(lowest_rq, next_task, 0);
 421
 422         resched_task(lowest_rq->curr);
 423
 424         spin_unlock(&lowest_rq->lock);
 425
 426         ret = 1;
 427 out:
 428         put_task_struct(next_task);
 429
 430         return ret;
 431 }
 432
 433 /*
 434  * TODO: Currently we just use the second highest prio task on
 435  *       the queue, and stop when it can't migrate (or there's
 436  *       no more RT tasks).  There may be a case where a lower
 437  *       priority RT task has a different affinity than the
 438  *       higher RT task. In this case the lower RT task could
 439  *       possibly be able to migrate where as the higher priority
 440  *       RT task could not.  We currently ignore this issue.
 441  *       Enhancements are welcome!
 442  */
 443 static void push_rt_tasks(struct rq *rq)
 444 {
 445         /* push_rt_task will return true if it moved an RT */
 446         while (push_rt_task(rq))
 447                 ;
 448 }
 449
 450 static int pull_rt_task(struct rq *this_rq)
 451 {
 452         struct task_struct *next;
 453         struct task_struct *p;
 454         struct rq *src_rq;
 455         cpumask_t *rto_cpumask;
 456         int this_cpu = this_rq->cpu;
 457         int cpu;
 458         int ret = 0;
 459
 460         assert_spin_locked(&this_rq->lock);
 461
 462         /*
 463          * If cpusets are used, and we have overlapping
 464          * run queue cpusets, then this algorithm may not catch all.
 465          * This is just the price you pay on trying to keep
 466          * dirtying caches down on large SMP machines.
 467          */
 468         if (likely(!rt_overloaded()))
 469                 return 0;
 470
 471         next = pick_next_task_rt(this_rq);
 472
 473         rto_cpumask = rt_overload();
 474
 475         for_each_cpu_mask(cpu, *rto_cpumask) {
 476                 if (this_cpu == cpu)
 477                         continue;
 478
 479                 src_rq = cpu_rq(cpu);
 480                 if (unlikely(src_rq->rt.rt_nr_running <= 1)) {
 481                         /*
 482                          * It is possible that overlapping cpusets
 483                          * will miss clearing a non overloaded runqueue.
 484                          * Clear it now.
 485                          */
 486                         if (double_lock_balance(this_rq, src_rq)) {
 487                                 /* unlocked our runqueue lock */
 488                                 struct task_struct *old_next = next;
 489                                 next = pick_next_task_rt(this_rq);
 490                                 if (next != old_next)
 491                                         ret = 1;
 492                         }
 493                         if (likely(src_rq->rt.rt_nr_running <= 1))
 494                                 /*
 495                                  * Small chance that this_rq->curr changed
 496                                  * but it's really harmless here.
 497                                  */
 498                                 rt_clear_overload(this_rq);
 499                         else
 500                                 /*
 501                                  * Heh, the src_rq is now overloaded, since
 502                                  * we already have the src_rq lock, go straight
 503                                  * to pulling tasks from it.
 504                                  */
 505                                 goto try_pulling;
 506                         spin_unlock(&src_rq->lock);
 507                         continue;
 508                 }
 509
 510                 /*
 511                  * We can potentially drop this_rq's lock in
 512                  * double_lock_balance, and another CPU could
 513                  * steal our next task - hence we must cause
 514                  * the caller to recalculate the next task
 515                  * in that case:
 516                  */
 517                 if (double_lock_balance(this_rq, src_rq)) {
 518                         struct task_struct *old_next = next;
 519                         next = pick_next_task_rt(this_rq);
 520                         if (next != old_next)
 521                                 ret = 1;
 522                 }
 523
 524                 /*
 525                  * Are there still pullable RT tasks?
 526                  */
 527                 if (src_rq->rt.rt_nr_running <= 1) {
 528                         spin_unlock(&src_rq->lock);
 529                         continue;
 530                 }
 531
 532  try_pulling:
 533                 p = pick_next_highest_task_rt(src_rq, this_cpu);
 534
 535                 /*
 536                  * Do we have an RT task that preempts
 537                  * the to-be-scheduled task?
 538                  */
 539                 if (p && (!next || (p->prio < next->prio))) {
 540                         WARN_ON(p == src_rq->curr);
 541                         WARN_ON(!p->se.on_rq);
 542
 543                         /*
 544                          * There's a chance that p is higher in priority
 545                          * than what's currently running on its cpu.
 546                          * This is just that p is wakeing up and hasn't
 547                          * had a chance to schedule. We only pull
 548                          * p if it is lower in priority than the
 549                          * current task on the run queue or
 550                          * this_rq next task is lower in prio than
 551                          * the current task on that rq.
 552                          */
 553                         if (p->prio < src_rq->curr->prio ||
 554                             (next && next->prio < src_rq->curr->prio))
 555                                 goto bail;
 556
 557                         ret = 1;
 558
 559                         deactivate_task(src_rq, p, 0);
 560                         set_task_cpu(p, this_cpu);
 561                         activate_task(this_rq, p, 0);
 562                         /*
 563                          * We continue with the search, just in
 564                          * case there's an even higher prio task
 565                          * in another runqueue. (low likelyhood
 566                          * but possible)
 567                          */
 568
 569                         /*
 570                          * Update next so that we won't pick a task
 571                          * on another cpu with a priority lower (or equal)
 572                          * than the one we just picked.
 573                          */
 574                         next = p;
 575
 576                 }
 577  bail:
 578                 spin_unlock(&src_rq->lock);
 579         }
 580
 581         return ret;
 582 }
 583
 584 static void schedule_balance_rt(struct rq *rq,
 585                                 struct task_struct *prev)
 586 {
 587         /* Try to pull RT tasks here if we lower this rq's prio */
 588         if (unlikely(rt_task(prev)) &&
 589             rq->rt.highest_prio > prev->prio)
 590                 pull_rt_task(rq);
 591 }
 592
 593 static void schedule_tail_balance_rt(struct rq *rq)
 594 {
 595         /*
 596          * If we have more than one rt_task queued, then
 597          * see if we can push the other rt_tasks off to other CPUS.
 598          * Note we may release the rq lock, and since
 599          * the lock was owned by prev, we need to release it
 600          * first via finish_lock_switch and then reaquire it here.
 601          */
 602         if (unlikely(rq->rt.rt_nr_running > 1)) {
 603                 spin_lock_irq(&rq->lock);
 604                 push_rt_tasks(rq);
 605                 spin_unlock_irq(&rq->lock);
 606         }
 607 }
 608
 609
 610 static void wakeup_balance_rt(struct rq *rq, struct task_struct *p)
 611 {
 612         if (unlikely(rt_task(p)) &&
 613             !task_running(rq, p) &&
 614             (p->prio >= rq->curr->prio))
 615                 push_rt_tasks(rq);
 616 }
 617
 618 static unsigned long
 619 load_balance_rt(struct rq *this_rq, int this_cpu, struct rq *busiest,
 620                 unsigned long max_load_move,
 621                 struct sched_domain *sd, enum cpu_idle_type idle,
 622                 int *all_pinned, int *this_best_prio)
 623 {
 624         /* don't touch RT tasks */
 625         return 0;
 626 }
 627
 628 static int
 629 move_one_task_rt(struct rq *this_rq, int this_cpu, struct rq *busiest,
 630                  struct sched_domain *sd, enum cpu_idle_type idle)
 631 {
 632         /* don't touch RT tasks */
 633         return 0;
 634 }
 635 static void set_cpus_allowed_rt(struct task_struct *p, cpumask_t *new_mask)
 636 {
 637         int weight = cpus_weight(*new_mask);
 638
 639         BUG_ON(!rt_task(p));
 640
 641         /*
 642          * Update the migration status of the RQ if we have an RT task
 643          * which is running AND changing its weight value.
 644          */
 645         if (p->se.on_rq && (weight != p->nr_cpus_allowed)) {
 646                 struct rq *rq = task_rq(p);
 647
 648                 if ((p->nr_cpus_allowed <= 1) && (weight > 1))
 649                         rq->rt.rt_nr_migratory++;
 650                 else if((p->nr_cpus_allowed > 1) && (weight <= 1)) {
 651                         BUG_ON(!rq->rt.rt_nr_migratory);
 652                         rq->rt.rt_nr_migratory--;
 653                 }
 654
 655                 update_rt_migration(rq);
 656         }
 657
 658         p->cpus_allowed    = *new_mask;
 659         p->nr_cpus_allowed = weight;
 660 }
 661 #else /* CONFIG_SMP */
 662 # define schedule_tail_balance_rt(rq)   do { } while (0)
 663 # define schedule_balance_rt(rq, prev)  do { } while (0)
 664 # define wakeup_balance_rt(rq, p)       do { } while (0)
 665 #endif /* CONFIG_SMP */
 666
 667 static void task_tick_rt(struct rq *rq, struct task_struct *p)
 668 {
 669         update_curr_rt(rq);
 670
 671         /*
 672          * RR tasks need a special form of timeslice management.
 673          * FIFO tasks have no timeslices.
 674          */
 675         if (p->policy != SCHED_RR)
 676                 return;
 677
 678         if (--p->time_slice)
 679                 return;
 680
 681         p->time_slice = DEF_TIMESLICE;
 682
 683         /*
 684          * Requeue to the end of queue if we are not the only element
 685          * on the queue:
 686          */
 687         if (p->run_list.prev != p->run_list.next) {
 688                 requeue_task_rt(rq, p);
 689                 set_tsk_need_resched(p);
 690         }
 691 }
 692
 693 static void set_curr_task_rt(struct rq *rq)
 694 {
 695         struct task_struct *p = rq->curr;
 696
 697         p->se.exec_start = rq->clock;
 698 }
 699
 700 const struct sched_class rt_sched_class = {
 701         .next                   = &fair_sched_class,
 702         .enqueue_task           = enqueue_task_rt,
 703         .dequeue_task           = dequeue_task_rt,
 704         .yield_task             = yield_task_rt,
 705 #ifdef CONFIG_SMP
 706         .select_task_rq         = select_task_rq_rt,
 707 #endif /* CONFIG_SMP */
 708
 709         .check_preempt_curr     = check_preempt_curr_rt,
 710
 711         .pick_next_task         = pick_next_task_rt,
 712         .put_prev_task          = put_prev_task_rt,
 713
 714 #ifdef CONFIG_SMP
 715         .load_balance           = load_balance_rt,
 716         .move_one_task          = move_one_task_rt,
 717         .set_cpus_allowed       = set_cpus_allowed_rt,
 718 #endif
 719
 720         .set_curr_task          = set_curr_task_rt,
 721         .task_tick              = task_tick_rt,
 722 };