projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 51e0304c IM |
1 | /* |
| 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. | |
| 5 | */ | |
| 6 | SCHED_FEAT(GENTLE_FAIR_SLEEPERS, 1) | |
| e26af0e8 | 7 | |
| e26af0e8 PZ |
8 | /* |
| 9 | * Place new tasks ahead so that they do not starve already running | |
| 10 | * tasks | |
| 11 | */ | |
| f00b45c1 | 12 | SCHED_FEAT(START_DEBIT, 1) |
| e26af0e8 PZ |
13 | |
| 14 | /* | |
| 15 | * Should wakeups try to preempt running tasks. | |
| 16 | */ | |
| 17 | SCHED_FEAT(WAKEUP_PREEMPT, 1) | |
| 18 | ||
| e26af0e8 PZ |
19 | /* |
| 20 | * Based on load and program behaviour, see if it makes sense to place | |
| 21 | * a newly woken task on the same cpu as the task that woke it -- | |
| 22 | * improve cache locality. Typically used with SYNC wakeups as | |
| 23 | * generated by pipes and the like, see also SYNC_WAKEUPS. | |
| 24 | */ | |
| f00b45c1 | 25 | SCHED_FEAT(AFFINE_WAKEUPS, 1) |
| e26af0e8 PZ |
26 | |
| 27 | /* | |
| 28 | * Prefer to schedule the task we woke last (assuming it failed | |
| 29 | * wakeup-preemption), since its likely going to consume data we | |
| 30 | * touched, increases cache locality. | |
| 31 | */ | |
| 0ec9fab3 | 32 | SCHED_FEAT(NEXT_BUDDY, 0) |
| e26af0e8 PZ |
33 | |
| 34 | /* | |
| 35 | * Prefer to schedule the task that ran last (when we did | |
| 36 | * wake-preempt) as that likely will touch the same data, increases | |
| 37 | * cache locality. | |
| 38 | */ | |
| 39 | SCHED_FEAT(LAST_BUDDY, 1) | |
| 40 | ||
| 41 | /* | |
| 42 | * Consider buddies to be cache hot, decreases the likelyness of a | |
| 43 | * cache buddy being migrated away, increases cache locality. | |
| 44 | */ | |
| f00b45c1 | 45 | SCHED_FEAT(CACHE_HOT_BUDDY, 1) |
| e26af0e8 | 46 | |
| 8e6598af PZ |
47 | /* |
| 48 | * Use arch dependent cpu power functions | |
| 49 | */ | |
| 50 | SCHED_FEAT(ARCH_POWER, 0) | |
| 51 | ||
| 0c4b83da | 52 | SCHED_FEAT(HRTICK, 0) |
| f00b45c1 | 53 | SCHED_FEAT(DOUBLE_TICK, 0) |
| efc2dead | 54 | SCHED_FEAT(LB_BIAS, 1) |
| e26af0e8 PZ |
55 | |
| 56 | /* | |
| 57 | * Spin-wait on mutex acquisition when the mutex owner is running on | |
| 58 | * another cpu -- assumes that when the owner is running, it will soon | |
| 59 | * release the lock. Decreases scheduling overhead. | |
| 60 | */ | |
| 0d66bf6d | 61 | SCHED_FEAT(OWNER_SPIN, 1) |
| aa483808 VP |
62 | |
| 63 | /* | |
| 64 | * Decrement CPU power based on irq activity | |
| 65 | */ | |
| 66 | SCHED_FEAT(NONIRQ_POWER, 1) |