diff options
Diffstat (limited to 'kernel/sched/features.h')
| -rw-r--r-- | kernel/sched/features.h | 45 |
1 files changed, 42 insertions, 3 deletions
diff --git a/kernel/sched/features.h b/kernel/sched/features.h index 143f55df890b..980d92bab8ab 100644 --- a/kernel/sched/features.h +++ b/kernel/sched/features.h @@ -5,15 +5,40 @@ * sleep+wake cycles. EEVDF placement strategy #1, #2 if disabled. */ SCHED_FEAT(PLACE_LAG, true) +/* + * Give new tasks half a slice to ease into the competition. + */ SCHED_FEAT(PLACE_DEADLINE_INITIAL, true) +/* + * Preserve relative virtual deadline on 'migration'. + */ +SCHED_FEAT(PLACE_REL_DEADLINE, true) +/* + * Inhibit (wakeup) preemption until the current task has either matched the + * 0-lag point or until is has exhausted it's slice. + */ SCHED_FEAT(RUN_TO_PARITY, true) +/* + * Allow wakeup of tasks with a shorter slice to cancel RUN_TO_PARITY for + * current. + */ +SCHED_FEAT(PREEMPT_SHORT, true) /* * Prefer to schedule the task we woke last (assuming it failed * wakeup-preemption), since its likely going to consume data we * touched, increases cache locality. */ -SCHED_FEAT(NEXT_BUDDY, false) +SCHED_FEAT(NEXT_BUDDY, true) + +/* + * Allow completely ignoring cfs_rq->next; which can be set from various + * places: + * - NEXT_BUDDY (wakeup preemption) + * - yield_to_task() + * - cgroup dequeue / pick + */ +SCHED_FEAT(PICK_BUDDY, true) /* * Consider buddies to be cache hot, decreases the likeliness of a @@ -22,13 +47,24 @@ SCHED_FEAT(NEXT_BUDDY, false) SCHED_FEAT(CACHE_HOT_BUDDY, true) /* + * Delay dequeueing tasks until they get selected or woken. + * + * By delaying the dequeue for non-eligible tasks, they remain in the + * competition and can burn off their negative lag. When they get selected + * they'll have positive lag by definition. + * + * DELAY_ZERO clips the lag on dequeue (or wakeup) to 0. + */ +SCHED_FEAT(DELAY_DEQUEUE, true) +SCHED_FEAT(DELAY_ZERO, true) + +/* * Allow wakeup-time preemption of the current task: */ SCHED_FEAT(WAKEUP_PREEMPTION, true) SCHED_FEAT(HRTICK, false) SCHED_FEAT(HRTICK_DL, false) -SCHED_FEAT(DOUBLE_TICK, false) /* * Decrement CPU capacity based on time not spent running tasks @@ -86,4 +122,7 @@ SCHED_FEAT(UTIL_EST, true) SCHED_FEAT(LATENCY_WARN, false) -SCHED_FEAT(HZ_BW, true) +/* + * Do newidle balancing proportional to its success rate using randomization. + */ +SCHED_FEAT(NI_RANDOM, true) |