blob: e68e69ab917dcc244577504027e1b357230c55fe [file] [log] [blame]
Peter Zijlstrae26af0e2009-09-11 12:31:23 +02001/*
Ingo Molnar51e03042009-09-16 08:54:45 +02002 * Only give sleepers 50% of their service deficit. This allows
3 * them to run sooner, but does not allow tons of sleepers to
4 * rip the spread apart.
5 */
Peter Zijlstraf8b6d1c2011-07-06 14:20:14 +02006SCHED_FEAT(GENTLE_FAIR_SLEEPERS, true)
Peter Zijlstrae26af0e2009-09-11 12:31:23 +02007
8/*
Peter Zijlstrae26af0e2009-09-11 12:31:23 +02009 * Place new tasks ahead so that they do not starve already running
10 * tasks
11 */
Peter Zijlstraf8b6d1c2011-07-06 14:20:14 +020012SCHED_FEAT(START_DEBIT, true)
Peter Zijlstrae26af0e2009-09-11 12:31:23 +020013
14/*
Peter Zijlstrae26af0e2009-09-11 12:31:23 +020015 * Prefer to schedule the task we woke last (assuming it failed
16 * wakeup-preemption), since its likely going to consume data we
17 * touched, increases cache locality.
18 */
Peter Zijlstraf8b6d1c2011-07-06 14:20:14 +020019SCHED_FEAT(NEXT_BUDDY, false)
Peter Zijlstrae26af0e2009-09-11 12:31:23 +020020
21/*
22 * Prefer to schedule the task that ran last (when we did
23 * wake-preempt) as that likely will touch the same data, increases
24 * cache locality.
25 */
Peter Zijlstraf8b6d1c2011-07-06 14:20:14 +020026SCHED_FEAT(LAST_BUDDY, true)
Peter Zijlstrae26af0e2009-09-11 12:31:23 +020027
28/*
29 * Consider buddies to be cache hot, decreases the likelyness of a
30 * cache buddy being migrated away, increases cache locality.
31 */
Peter Zijlstraf8b6d1c2011-07-06 14:20:14 +020032SCHED_FEAT(CACHE_HOT_BUDDY, true)
Peter Zijlstrae26af0e2009-09-11 12:31:23 +020033
Peter Zijlstra8e6598a2009-09-03 13:20:03 +020034/*
Ingo Molnar8ed92e512012-10-14 14:28:50 +020035 * Allow wakeup-time preemption of the current task:
36 */
37SCHED_FEAT(WAKEUP_PREEMPTION, true)
38
39/*
Peter Zijlstra8e6598a2009-09-03 13:20:03 +020040 * Use arch dependent cpu power functions
41 */
Vincent Guittotbc2a27c2012-07-09 11:27:06 +020042SCHED_FEAT(ARCH_POWER, true)
Peter Zijlstra8e6598a2009-09-03 13:20:03 +020043
Peter Zijlstraf8b6d1c2011-07-06 14:20:14 +020044SCHED_FEAT(HRTICK, false)
45SCHED_FEAT(DOUBLE_TICK, false)
46SCHED_FEAT(LB_BIAS, true)
Peter Zijlstrae26af0e2009-09-11 12:31:23 +020047
48/*
49 * Spin-wait on mutex acquisition when the mutex owner is running on
50 * another cpu -- assumes that when the owner is running, it will soon
51 * release the lock. Decreases scheduling overhead.
52 */
Peter Zijlstraf8b6d1c2011-07-06 14:20:14 +020053SCHED_FEAT(OWNER_SPIN, true)
Venkatesh Pallipadiaa483802010-10-04 17:03:22 -070054
55/*
Glauber Costa095c0aa2011-07-11 15:28:18 -040056 * Decrement CPU power based on time not spent running tasks
Venkatesh Pallipadiaa483802010-10-04 17:03:22 -070057 */
Peter Zijlstraf8b6d1c2011-07-06 14:20:14 +020058SCHED_FEAT(NONTASK_POWER, true)
Peter Zijlstra317f3942011-04-05 17:23:58 +020059
60/*
61 * Queue remote wakeups on the target CPU and process them
62 * using the scheduler IPI. Reduces rq->lock contention/bounces.
63 */
Peter Zijlstraf8b6d1c2011-07-06 14:20:14 +020064SCHED_FEAT(TTWU_QUEUE, true)
Peter Zijlstrae3589f62011-07-15 10:35:52 +020065
Peter Zijlstraf8b6d1c2011-07-06 14:20:14 +020066SCHED_FEAT(FORCE_SD_OVERLAP, false)
67SCHED_FEAT(RT_RUNTIME_SHARE, true)
Peter Zijlstraeb953082012-04-17 13:38:40 +020068SCHED_FEAT(LB_MIN, false)