2009-09-16 14:54:45 +08:00
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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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2011-07-06 20:20:14 +08:00
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SCHED_FEAT(GENTLE_FAIR_SLEEPERS, true)
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2009-09-11 18:31:23 +08:00
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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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2011-07-06 20:20:14 +08:00
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SCHED_FEAT(START_DEBIT, true)
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2009-09-11 18:31:23 +08:00
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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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2011-07-06 20:20:14 +08:00
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SCHED_FEAT(NEXT_BUDDY, false)
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2009-09-11 18:31:23 +08:00
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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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2011-07-06 20:20:14 +08:00
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SCHED_FEAT(LAST_BUDDY, true)
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2009-09-11 18:31:23 +08:00
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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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2011-07-06 20:20:14 +08:00
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SCHED_FEAT(CACHE_HOT_BUDDY, true)
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2009-09-11 18:31:23 +08:00
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2012-10-14 20:28:50 +08:00
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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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2009-09-03 19:20:03 +08:00
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/*
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2014-05-28 01:50:41 +08:00
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* Use arch dependent cpu capacity functions
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2009-09-03 19:20:03 +08:00
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*/
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2014-05-28 01:50:41 +08:00
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SCHED_FEAT(ARCH_CAPACITY, true)
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2009-09-03 19:20:03 +08:00
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2011-07-06 20:20:14 +08:00
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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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2009-09-11 18:31:23 +08:00
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|
2010-10-05 08:03:22 +08:00
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/*
|
2014-05-28 01:50:41 +08:00
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|
* Decrement CPU capacity based on time not spent running tasks
|
2010-10-05 08:03:22 +08:00
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*/
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2014-05-28 01:50:41 +08:00
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SCHED_FEAT(NONTASK_CAPACITY, true)
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2011-04-05 23:23:58 +08:00
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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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2011-07-06 20:20:14 +08:00
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SCHED_FEAT(TTWU_QUEUE, true)
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2011-07-15 16:35:52 +08:00
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|
2011-07-06 20:20:14 +08:00
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SCHED_FEAT(FORCE_SD_OVERLAP, false)
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SCHED_FEAT(RT_RUNTIME_SHARE, true)
|
2012-04-17 19:38:40 +08:00
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SCHED_FEAT(LB_MIN, false)
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2012-10-25 20:16:43 +08:00
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/*
|
2012-11-22 19:16:36 +08:00
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|
|
* Apply the automatic NUMA scheduling policy. Enabled automatically
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|
* at runtime if running on a NUMA machine. Can be controlled via
|
2013-10-07 18:28:53 +08:00
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|
|
* numa_balancing=
|
2012-10-25 20:16:43 +08:00
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|
|
*/
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|
|
#ifdef CONFIG_NUMA_BALANCING
|
2012-11-22 19:16:36 +08:00
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SCHED_FEAT(NUMA, false)
|
2013-10-07 18:29:00 +08:00
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|
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/*
|
|
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|
|
* NUMA_FAVOUR_HIGHER will favor moving tasks towards nodes where a
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|
|
* higher number of hinting faults are recorded during active load
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|
|
* balancing.
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|
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*/
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SCHED_FEAT(NUMA_FAVOUR_HIGHER, true)
|
2013-10-07 18:29:01 +08:00
|
|
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|
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|
|
/*
|
|
|
|
|
* NUMA_RESIST_LOWER will resist moving tasks towards nodes where a
|
|
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|
|
* lower number of hinting faults have been recorded. As this has
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|
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|
|
* the potential to prevent a task ever migrating to a new node
|
|
|
|
|
* due to CPU overload it is disabled by default.
|
|
|
|
|
*/
|
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|
|
SCHED_FEAT(NUMA_RESIST_LOWER, false)
|
2012-10-25 20:16:43 +08:00
|
|
|
#endif
|
