1/* SPDX-License-Identifier: GPL-2.0 */ 2 3/* 4 * Using the avg_vruntime, do the right thing and preserve lag across 5 * sleep+wake cycles. EEVDF placement strategy #1, #2 if disabled. 6 */ 7SCHED_FEAT(PLACE_LAG, true) 8SCHED_FEAT(PLACE_DEADLINE_INITIAL, true) 9SCHED_FEAT(RUN_TO_PARITY, true) 10 11/* 12 * Prefer to schedule the task we woke last (assuming it failed 13 * wakeup-preemption), since its likely going to consume data we 14 * touched, increases cache locality. 15 */ 16SCHED_FEAT(NEXT_BUDDY, false) 17 18/* 19 * Consider buddies to be cache hot, decreases the likeliness of a 20 * cache buddy being migrated away, increases cache locality. 21 */ 22SCHED_FEAT(CACHE_HOT_BUDDY, true) 23 24/* 25 * Allow wakeup-time preemption of the current task: 26 */ 27SCHED_FEAT(WAKEUP_PREEMPTION, true) 28 29SCHED_FEAT(HRTICK, false) 30SCHED_FEAT(HRTICK_DL, false) 31SCHED_FEAT(DOUBLE_TICK, false) 32 33/* 34 * Decrement CPU capacity based on time not spent running tasks 35 */ 36SCHED_FEAT(NONTASK_CAPACITY, true) 37 38#ifdef CONFIG_PREEMPT_RT 39SCHED_FEAT(TTWU_QUEUE, false) 40#else 41 42/* 43 * Queue remote wakeups on the target CPU and process them 44 * using the scheduler IPI. Reduces rq->lock contention/bounces. 45 */ 46SCHED_FEAT(TTWU_QUEUE, true) 47#endif 48 49/* 50 * When doing wakeups, attempt to limit superfluous scans of the LLC domain. 51 */ 52SCHED_FEAT(SIS_UTIL, true) 53 54/* 55 * Issue a WARN when we do multiple update_rq_clock() calls 56 * in a single rq->lock section. Default disabled because the 57 * annotations are not complete. 58 */ 59SCHED_FEAT(WARN_DOUBLE_CLOCK, false) 60 61#ifdef HAVE_RT_PUSH_IPI 62/* 63 * In order to avoid a thundering herd attack of CPUs that are 64 * lowering their priorities at the same time, and there being 65 * a single CPU that has an RT task that can migrate and is waiting 66 * to run, where the other CPUs will try to take that CPUs 67 * rq lock and possibly create a large contention, sending an 68 * IPI to that CPU and let that CPU push the RT task to where 69 * it should go may be a better scenario. 70 */ 71SCHED_FEAT(RT_PUSH_IPI, true) 72#endif 73 74SCHED_FEAT(RT_RUNTIME_SHARE, false) 75SCHED_FEAT(LB_MIN, false) 76SCHED_FEAT(ATTACH_AGE_LOAD, true) 77 78SCHED_FEAT(WA_IDLE, true) 79SCHED_FEAT(WA_WEIGHT, true) 80SCHED_FEAT(WA_BIAS, true) 81 82/* 83 * UtilEstimation. Use estimated CPU utilization. 84 */ 85SCHED_FEAT(UTIL_EST, true) 86 87SCHED_FEAT(LATENCY_WARN, false) 88 89SCHED_FEAT(HZ_BW, true) 90