Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
51e0304c IM |
2 | /* |
3 | * Only give sleepers 50% of their service deficit. This allows | |
4 | * them to run sooner, but does not allow tons of sleepers to | |
5 | * rip the spread apart. | |
6 | */ | |
f8b6d1cc | 7 | SCHED_FEAT(GENTLE_FAIR_SLEEPERS, true) |
e26af0e8 | 8 | |
e26af0e8 PZ |
9 | /* |
10 | * Place new tasks ahead so that they do not starve already running | |
11 | * tasks | |
12 | */ | |
f8b6d1cc | 13 | SCHED_FEAT(START_DEBIT, true) |
e26af0e8 | 14 | |
e26af0e8 PZ |
15 | /* |
16 | * Prefer to schedule the task we woke last (assuming it failed | |
17 | * wakeup-preemption), since its likely going to consume data we | |
18 | * touched, increases cache locality. | |
19 | */ | |
f8b6d1cc | 20 | SCHED_FEAT(NEXT_BUDDY, false) |
e26af0e8 PZ |
21 | |
22 | /* | |
23 | * Prefer to schedule the task that ran last (when we did | |
24 | * wake-preempt) as that likely will touch the same data, increases | |
25 | * cache locality. | |
26 | */ | |
f8b6d1cc | 27 | SCHED_FEAT(LAST_BUDDY, true) |
e26af0e8 PZ |
28 | |
29 | /* | |
30 | * Consider buddies to be cache hot, decreases the likelyness of a | |
31 | * cache buddy being migrated away, increases cache locality. | |
32 | */ | |
f8b6d1cc | 33 | SCHED_FEAT(CACHE_HOT_BUDDY, true) |
e26af0e8 | 34 | |
8ed92e51 IM |
35 | /* |
36 | * Allow wakeup-time preemption of the current task: | |
37 | */ | |
38 | SCHED_FEAT(WAKEUP_PREEMPTION, true) | |
39 | ||
f8b6d1cc PZ |
40 | SCHED_FEAT(HRTICK, false) |
41 | SCHED_FEAT(DOUBLE_TICK, false) | |
e26af0e8 | 42 | |
aa483808 | 43 | /* |
5d4dfddd | 44 | * Decrement CPU capacity based on time not spent running tasks |
aa483808 | 45 | */ |
5d4dfddd | 46 | SCHED_FEAT(NONTASK_CAPACITY, true) |
317f3941 PZ |
47 | |
48 | /* | |
49 | * Queue remote wakeups on the target CPU and process them | |
50 | * using the scheduler IPI. Reduces rq->lock contention/bounces. | |
51 | */ | |
f8b6d1cc | 52 | SCHED_FEAT(TTWU_QUEUE, true) |
e3589f6c | 53 | |
4c77b18c PZ |
54 | /* |
55 | * When doing wakeups, attempt to limit superfluous scans of the LLC domain. | |
56 | */ | |
57 | SCHED_FEAT(SIS_AVG_CPU, false) | |
1ad3aaf3 | 58 | SCHED_FEAT(SIS_PROP, true) |
4c77b18c | 59 | |
26ae58d2 PZ |
60 | /* |
61 | * Issue a WARN when we do multiple update_rq_clock() calls | |
62 | * in a single rq->lock section. Default disabled because the | |
63 | * annotations are not complete. | |
64 | */ | |
65 | SCHED_FEAT(WARN_DOUBLE_CLOCK, false) | |
66 | ||
b6366f04 SR |
67 | #ifdef HAVE_RT_PUSH_IPI |
68 | /* | |
69 | * In order to avoid a thundering herd attack of CPUs that are | |
70 | * lowering their priorities at the same time, and there being | |
71 | * a single CPU that has an RT task that can migrate and is waiting | |
72 | * to run, where the other CPUs will try to take that CPUs | |
73 | * rq lock and possibly create a large contention, sending an | |
74 | * IPI to that CPU and let that CPU push the RT task to where | |
75 | * it should go may be a better scenario. | |
76 | */ | |
77 | SCHED_FEAT(RT_PUSH_IPI, true) | |
78 | #endif | |
79 | ||
f8b6d1cc | 80 | SCHED_FEAT(RT_RUNTIME_SHARE, true) |
eb95308e | 81 | SCHED_FEAT(LB_MIN, false) |
a9280514 PZ |
82 | SCHED_FEAT(ATTACH_AGE_LOAD, true) |
83 | ||
d153b153 | 84 | SCHED_FEAT(WA_IDLE, true) |
f2cdd9cc PZ |
85 | SCHED_FEAT(WA_WEIGHT, true) |
86 | SCHED_FEAT(WA_BIAS, true) | |
7f65ea42 PB |
87 | |
88 | /* | |
89 | * UtilEstimation. Use estimated CPU utilization. | |
90 | */ | |
d519329f | 91 | SCHED_FEAT(UTIL_EST, true) |