diff options
Diffstat (limited to 'kernel/sched/features.h')
-rw-r--r-- | kernel/sched/features.h | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/kernel/sched/features.h b/kernel/sched/features.h new file mode 100644 index 00000000..1ad1d2b5 --- /dev/null +++ b/kernel/sched/features.h @@ -0,0 +1,79 @@ +/* + * 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, true) + +/* + * Place new tasks ahead so that they do not starve already running + * tasks + */ +SCHED_FEAT(START_DEBIT, 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) + +/* + * 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, true) + +/* + * Consider buddies to be cache hot, decreases the likelyness of a + * cache buddy being migrated away, increases cache locality. + */ +SCHED_FEAT(CACHE_HOT_BUDDY, true) + +/* + * Allow wakeup-time preemption of the current task: + */ +SCHED_FEAT(WAKEUP_PREEMPTION, true) + +/* + * Use arch dependent cpu power functions + */ +SCHED_FEAT(ARCH_POWER, true) + +SCHED_FEAT(HRTICK, false) +SCHED_FEAT(DOUBLE_TICK, false) +SCHED_FEAT(LB_BIAS, true) + +/* + * 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, true) + +/* + * Decrement CPU power based on time not spent running tasks + */ +SCHED_FEAT(NONTASK_POWER, true) + +/* + * Queue remote wakeups on the target CPU and process them + * using the scheduler IPI. Reduces rq->lock contention/bounces. + */ +SCHED_FEAT(TTWU_QUEUE, true) + +SCHED_FEAT(FORCE_SD_OVERLAP, false) +SCHED_FEAT(RT_RUNTIME_SHARE, true) +SCHED_FEAT(LB_MIN, false) + +/* + * Apply the automatic NUMA scheduling policy. Enabled automatically + * at runtime if running on a NUMA machine. Can be controlled via + * numa_balancing=. Allow PTE scanning to be forced on UMA machines + * for debugging the core machinery. + */ +#ifdef CONFIG_NUMA_BALANCING +SCHED_FEAT(NUMA, false) +SCHED_FEAT(NUMA_FORCE, false) +#endif |