| /* |
| * Disregards a certain amount of sleep time (sched_latency_ns) and |
| * considers the task to be running during that period. This gives it |
| * a service deficit on wakeup, allowing it to run sooner. |
| */ |
| SCHED_FEAT(FAIR_SLEEPERS, 1) |
| |
| /* |
| * Only give sleepers 50% of their service deficit. This allows |
| * them to run sooner, but does not allow tons of sleepers to |
| * rip the spread apart. |
| */ |
| SCHED_FEAT(GENTLE_FAIR_SLEEPERS, 1) |
| |
| /* |
| * By not normalizing the sleep time, heavy tasks get an effective |
| * longer period, and lighter task an effective shorter period they |
| * are considered running. |
| */ |
| SCHED_FEAT(NORMALIZED_SLEEPER, 0) |
| |
| /* |
| * Place new tasks ahead so that they do not starve already running |
| * tasks |
| */ |
| SCHED_FEAT(START_DEBIT, 1) |
| |
| /* |
| * Should wakeups try to preempt running tasks. |
| */ |
| SCHED_FEAT(WAKEUP_PREEMPT, 1) |
| |
| /* |
| * Compute wakeup_gran based on task behaviour, clipped to |
| * [0, sched_wakeup_gran_ns] |
| */ |
| SCHED_FEAT(ADAPTIVE_GRAN, 1) |
| |
| /* |
| * When converting the wakeup granularity to virtual time, do it such |
| * that heavier tasks preempting a lighter task have an edge. |
| */ |
| SCHED_FEAT(ASYM_GRAN, 1) |
| |
| /* |
| * Always wakeup-preempt SYNC wakeups, see SYNC_WAKEUPS. |
| */ |
| SCHED_FEAT(WAKEUP_SYNC, 0) |
| |
| /* |
| * Wakeup preempt based on task behaviour. Tasks that do not overlap |
| * don't get preempted. |
| */ |
| SCHED_FEAT(WAKEUP_OVERLAP, 0) |
| |
| /* |
| * Use the SYNC wakeup hint, pipes and the likes use this to indicate |
| * the remote end is likely to consume the data we just wrote, and |
| * therefore has cache benefit from being placed on the same cpu, see |
| * also AFFINE_WAKEUPS. |
| */ |
| SCHED_FEAT(SYNC_WAKEUPS, 1) |
| |
| /* |
| * Based on load and program behaviour, see if it makes sense to place |
| * a newly woken task on the same cpu as the task that woke it -- |
| * improve cache locality. Typically used with SYNC wakeups as |
| * generated by pipes and the like, see also SYNC_WAKEUPS. |
| */ |
| SCHED_FEAT(AFFINE_WAKEUPS, 1) |
| |
| /* |
| * Weaken SYNC hint based on overlap |
| */ |
| SCHED_FEAT(SYNC_LESS, 1) |
| |
| /* |
| * Add SYNC hint based on overlap |
| */ |
| SCHED_FEAT(SYNC_MORE, 0) |
| |
| /* |
| * 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, 0) |
| |
| /* |
| * Prefer to schedule the task that ran last (when we did |
| * wake-preempt) as that likely will touch the same data, increases |
| * cache locality. |
| */ |
| SCHED_FEAT(LAST_BUDDY, 1) |
| |
| /* |
| * Consider buddies to be cache hot, decreases the likelyness of a |
| * cache buddy being migrated away, increases cache locality. |
| */ |
| SCHED_FEAT(CACHE_HOT_BUDDY, 1) |
| |
| /* |
| * Use arch dependent cpu power functions |
| */ |
| SCHED_FEAT(ARCH_POWER, 0) |
| |
| SCHED_FEAT(HRTICK, 0) |
| SCHED_FEAT(DOUBLE_TICK, 0) |
| SCHED_FEAT(LB_BIAS, 1) |
| SCHED_FEAT(LB_SHARES_UPDATE, 1) |
| SCHED_FEAT(ASYM_EFF_LOAD, 1) |
| |
| /* |
| * Spin-wait on mutex acquisition when the mutex owner is running on |
| * another cpu -- assumes that when the owner is running, it will soon |
| * release the lock. Decreases scheduling overhead. |
| */ |
| SCHED_FEAT(OWNER_SPIN, 1) |