2 * Disregards a certain amount of sleep time (sched_latency_ns) and
3 * considers the task to be running during that period. This gives it
4 * a service deficit on wakeup, allowing it to run sooner.
6 SCHED_FEAT(NEW_FAIR_SLEEPERS
, 0)
9 * By not normalizing the sleep time, heavy tasks get an effective
10 * longer period, and lighter task an effective shorter period they
11 * are considered running.
13 SCHED_FEAT(NORMALIZED_SLEEPER
, 0)
16 * Place new tasks ahead so that they do not starve already running
19 SCHED_FEAT(START_DEBIT
, 1)
22 * Should wakeups try to preempt running tasks.
24 SCHED_FEAT(WAKEUP_PREEMPT
, 1)
27 * Compute wakeup_gran based on task behaviour, clipped to
28 * [0, sched_wakeup_gran_ns]
30 SCHED_FEAT(ADAPTIVE_GRAN
, 1)
33 * When converting the wakeup granularity to virtual time, do it such
34 * that heavier tasks preempting a lighter task have an edge.
36 SCHED_FEAT(ASYM_GRAN
, 1)
39 * Always wakeup-preempt SYNC wakeups, see SYNC_WAKEUPS.
41 SCHED_FEAT(WAKEUP_SYNC
, 0)
44 * Wakeup preempt based on task behaviour. Tasks that do not overlap
45 * don't get preempted.
47 SCHED_FEAT(WAKEUP_OVERLAP
, 0)
50 * Use the SYNC wakeup hint, pipes and the likes use this to indicate
51 * the remote end is likely to consume the data we just wrote, and
52 * therefore has cache benefit from being placed on the same cpu, see
53 * also AFFINE_WAKEUPS.
55 SCHED_FEAT(SYNC_WAKEUPS
, 1)
58 * Based on load and program behaviour, see if it makes sense to place
59 * a newly woken task on the same cpu as the task that woke it --
60 * improve cache locality. Typically used with SYNC wakeups as
61 * generated by pipes and the like, see also SYNC_WAKEUPS.
63 SCHED_FEAT(AFFINE_WAKEUPS
, 1)
66 * Weaken SYNC hint based on overlap
68 SCHED_FEAT(SYNC_LESS
, 1)
71 * Add SYNC hint based on overlap
73 SCHED_FEAT(SYNC_MORE
, 0)
76 * Prefer to schedule the task we woke last (assuming it failed
77 * wakeup-preemption), since its likely going to consume data we
78 * touched, increases cache locality.
80 SCHED_FEAT(NEXT_BUDDY
, 0)
83 * Prefer to schedule the task that ran last (when we did
84 * wake-preempt) as that likely will touch the same data, increases
87 SCHED_FEAT(LAST_BUDDY
, 1)
90 * Consider buddies to be cache hot, decreases the likelyness of a
91 * cache buddy being migrated away, increases cache locality.
93 SCHED_FEAT(CACHE_HOT_BUDDY
, 1)
96 * Use arch dependent cpu power functions
98 SCHED_FEAT(ARCH_POWER
, 0)
100 SCHED_FEAT(HRTICK
, 0)
101 SCHED_FEAT(DOUBLE_TICK
, 0)
102 SCHED_FEAT(LB_BIAS
, 1)
103 SCHED_FEAT(LB_WAKEUP_UPDATE
, 1)
104 SCHED_FEAT(ASYM_EFF_LOAD
, 1)
107 * Spin-wait on mutex acquisition when the mutex owner is running on
108 * another cpu -- assumes that when the owner is running, it will soon
109 * release the lock. Decreases scheduling overhead.
111 SCHED_FEAT(OWNER_SPIN
, 1)
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