134 lines
3.5 KiB
C
134 lines
3.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Only give sleepers 50% of their service deficit. This allows
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* them to run sooner, but does not allow tons of sleepers to
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* rip the spread apart.
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*/
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SCHED_FEAT(GENTLE_FAIR_SLEEPERS, true)
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/*
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* Place new tasks ahead so that they do not starve already running
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* tasks
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*/
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SCHED_FEAT(START_DEBIT, true)
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/*
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* Prefer to schedule the task we woke last (assuming it failed
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* wakeup-preemption), since its likely going to consume data we
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* touched, increases cache locality.
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*/
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SCHED_FEAT(NEXT_BUDDY, false)
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/*
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* Prefer to schedule the task that ran last (when we did
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* wake-preempt) as that likely will touch the same data, increases
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* cache locality.
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*/
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SCHED_FEAT(LAST_BUDDY, true)
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/*
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* Consider buddies to be cache hot, decreases the likelyness of a
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* cache buddy being migrated away, increases cache locality.
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*/
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SCHED_FEAT(CACHE_HOT_BUDDY, true)
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/*
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* Allow wakeup-time preemption of the current task:
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*/
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SCHED_FEAT(WAKEUP_PREEMPTION, true)
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SCHED_FEAT(HRTICK, false)
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SCHED_FEAT(DOUBLE_TICK, false)
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SCHED_FEAT(LB_BIAS, true)
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/*
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* Decrement CPU capacity based on time not spent running tasks
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*/
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SCHED_FEAT(NONTASK_CAPACITY, true)
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/*
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* Queue remote wakeups on the target CPU and process them
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* using the scheduler IPI. Reduces rq->lock contention/bounces.
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*/
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SCHED_FEAT(TTWU_QUEUE, true)
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/*
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* When doing wakeups, attempt to limit superfluous scans of the LLC domain.
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*/
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SCHED_FEAT(SIS_AVG_CPU, false)
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SCHED_FEAT(SIS_PROP, true)
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/*
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* Issue a WARN when we do multiple update_rq_clock() calls
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* in a single rq->lock section. Default disabled because the
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* annotations are not complete.
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*/
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SCHED_FEAT(WARN_DOUBLE_CLOCK, false)
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#ifdef HAVE_RT_PUSH_IPI
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/*
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* In order to avoid a thundering herd attack of CPUs that are
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* lowering their priorities at the same time, and there being
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* a single CPU that has an RT task that can migrate and is waiting
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* to run, where the other CPUs will try to take that CPUs
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* rq lock and possibly create a large contention, sending an
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* IPI to that CPU and let that CPU push the RT task to where
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* it should go may be a better scenario.
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*/
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SCHED_FEAT(RT_PUSH_IPI, true)
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#endif
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SCHED_FEAT(RT_RUNTIME_SHARE, false)
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SCHED_FEAT(LB_MIN, false)
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SCHED_FEAT(ATTACH_AGE_LOAD, true)
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SCHED_FEAT(WA_IDLE, true)
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SCHED_FEAT(WA_WEIGHT, true)
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SCHED_FEAT(WA_BIAS, true)
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/*
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* UtilEstimation. Use estimated CPU utilization.
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*/
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SCHED_FEAT(UTIL_EST, true)
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SCHED_FEAT(UTIL_EST_FASTUP, true)
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/*
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* Utilization clamping lazy update.
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*/
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SCHED_FEAT(UCLAMP_LAZY_UPDATE, false)
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/*
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* Fast pre-selection of CPU candidates for EAS.
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*/
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SCHED_FEAT(FIND_BEST_TARGET, false)
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/*
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* Energy aware scheduling algorithm choices:
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* EAS_PREFER_IDLE
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* Direct tasks in a schedtune.prefer_idle=1 group through
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* the EAS path for wakeup task placement. Otherwise, put
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* those tasks through the mainline slow path.
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*/
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SCHED_FEAT(EAS_PREFER_IDLE, true)
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#ifdef CONFIG_MTK_SCHED_LB_ENHANCEMENT
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SCHED_FEAT(SCHED_MTK_EAS, true)
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#else
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SCHED_FEAT(SCHED_MTK_EAS, false)
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#endif
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/*
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* Request max frequency from schedutil whenever a RT task is running.
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*/
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SCHED_FEAT(SUGOV_RT_MAX_FREQ, false)
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/*
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* Apply schedtune boost hold to tasks of all sched classes.
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* If enabled, schedtune will hold the boost applied to a CPU
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* for 50ms regardless of task activation - if the task is
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* still running 50ms later, the boost hold expires and schedtune
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* boost will expire immediately the task stops.
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* If disabled, this behaviour will only apply to tasks of the
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* RT class.
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*/
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SCHED_FEAT(SCHEDTUNE_BOOST_HOLD_ALL, false)
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