/* * Only give sleepers 50% of their service deficit. This allows * them to run sooner, but does not allow tons of sleepers to * rip the spread apart. */SCHED_FEAT(GENTLE_FAIR_SLEEPERS, true) /* * Place new tasks ahead so that they do not starve already running * tasks */SCHED_FEAT(START_DEBIT, true) /* * Prefer to schedule the task we woke last (assuming it failed * wakeup-preemption), since its likely going to consume data we * touched, increases cache locality. */SCHED_FEAT(NEXT_BUDDY, false) /* * Prefer to schedule the task that ran last (when we did * wake-preempt) as that likely will touch the same data, increases * cache locality. */SCHED_FEAT(LAST_BUDDY, true) /* * Consider buddies to be cache hot, decreases the likelyness of a * cache buddy being migrated away, increases cache locality. */SCHED_FEAT(CACHE_HOT_BUDDY, true) /* * Allow wakeup-time preemption of the current task: */SCHED_FEAT(WAKEUP_PREEMPTION, true) SCHED_FEAT(HRTICK, false)SCHED_FEAT(DOUBLE_TICK, false)SCHED_FEAT(LB_BIAS, true) /* * Decrement CPU capacity based on time not spent running tasks */SCHED_FEAT(NONTASK_CAPACITY, true) /* * Queue remote wakeups on the target CPU and process them * using the scheduler IPI. Reduces rq->lock contention/bounces. */SCHED_FEAT(TTWU_QUEUE, true) /* * When doing wakeups, attempt to limit superfluous scans of the LLC domain. */SCHED_FEAT(SIS_AVG_CPU, false)SCHED_FEAT(SIS_PROP, true) /* * Issue a WARN when we do multiple update_rq_clock() calls * in a single rq->lock section. Default disabled because the * annotations are not complete. */SCHED_FEAT(WARN_DOUBLE_CLOCK, false) #ifdef HAVE_RT_PUSH_IPI/* * In order to avoid a thundering herd attack of CPUs that are * lowering their priorities at the same time, and there being * a single CPU that has an RT task that can migrate and is waiting * to run, where the other CPUs will try to take that CPUs * rq lock and possibly create a large contention, sending an * IPI to that CPU and let that CPU push the RT task to where * it should go may be a better scenario. */SCHED_FEAT(RT_PUSH_IPI, true)#endif SCHED_FEAT(RT_RUNTIME_SHARE, true)SCHED_FEAT(LB_MIN, false)SCHED_FEAT(ATTACH_AGE_LOAD, true)