2 * 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.
6 SCHED_FEAT(GENTLE_FAIR_SLEEPERS
, true)
9 * Place new tasks ahead so that they do not starve already running
12 SCHED_FEAT(START_DEBIT
, true)
15 * 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.
19 SCHED_FEAT(NEXT_BUDDY
, false)
22 * Prefer to schedule the task that ran last (when we did
23 * wake-preempt) as that likely will touch the same data, increases
26 SCHED_FEAT(LAST_BUDDY
, true)
29 * Consider buddies to be cache hot, decreases the likelyness of a
30 * cache buddy being migrated away, increases cache locality.
32 SCHED_FEAT(CACHE_HOT_BUDDY
, true)
35 * Allow wakeup-time preemption of the current task:
37 SCHED_FEAT(WAKEUP_PREEMPTION
, true)
40 * Use arch dependent cpu power functions
42 SCHED_FEAT(ARCH_POWER
, true)
44 SCHED_FEAT(HRTICK
, false)
45 SCHED_FEAT(DOUBLE_TICK
, false)
46 SCHED_FEAT(LB_BIAS
, true)
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.
53 SCHED_FEAT(OWNER_SPIN
, true)
56 * Decrement CPU power based on time not spent running tasks
58 SCHED_FEAT(NONTASK_POWER
, true)
61 * Queue remote wakeups on the target CPU and process them
62 * using the scheduler IPI. Reduces rq->lock contention/bounces.
64 SCHED_FEAT(TTWU_QUEUE
, true)
66 SCHED_FEAT(FORCE_SD_OVERLAP
, false)
67 SCHED_FEAT(RT_RUNTIME_SHARE
, true)
68 SCHED_FEAT(LB_MIN
, false)
71 * Apply the automatic NUMA scheduling policy. Enabled automatically
72 * at runtime if running on a NUMA machine. Can be controlled via
73 * numa_balancing=. Allow PTE scanning to be forced on UMA machines
74 * for debugging the core machinery.
76 #ifdef CONFIG_NUMA_BALANCING
77 SCHED_FEAT(NUMA
, false)
78 SCHED_FEAT(NUMA_FORCE
, false)