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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 | /* SPDX-License-Identifier: GPL-2.0 */ /* * 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 likeliness 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(HRTICK_DL, false) SCHED_FEAT(DOUBLE_TICK, false) /* * Decrement CPU capacity based on time not spent running tasks */ SCHED_FEAT(NONTASK_CAPACITY, true) #ifdef CONFIG_PREEMPT_RT SCHED_FEAT(TTWU_QUEUE, false) #else /* * Queue remote wakeups on the target CPU and process them * using the scheduler IPI. Reduces rq->lock contention/bounces. */ SCHED_FEAT(TTWU_QUEUE, true) #endif /* * When doing wakeups, attempt to limit superfluous scans of the LLC domain. */ SCHED_FEAT(SIS_PROP, false) SCHED_FEAT(SIS_UTIL, 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, false) SCHED_FEAT(LB_MIN, false) SCHED_FEAT(ATTACH_AGE_LOAD, true) SCHED_FEAT(WA_IDLE, true) SCHED_FEAT(WA_WEIGHT, true) SCHED_FEAT(WA_BIAS, true) /* * UtilEstimation. Use estimated CPU utilization. */ SCHED_FEAT(UTIL_EST, true) SCHED_FEAT(UTIL_EST_FASTUP, true) SCHED_FEAT(LATENCY_WARN, false) SCHED_FEAT(ALT_PERIOD, true) SCHED_FEAT(BASE_SLICE, true) |