From 391e43da797a96aeb65410281891f6d0b0e9611c Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Tue, 15 Nov 2011 17:14:39 +0100 Subject: sched: Move all scheduler bits into kernel/sched/ There's too many sched*.[ch] files in kernel/, give them their own directory. (No code changed, other than Makefile glue added.) Signed-off-by: Peter Zijlstra Signed-off-by: Ingo Molnar --- kernel/sched/features.h | 70 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 70 insertions(+) create mode 100644 kernel/sched/features.h (limited to 'kernel/sched/features.h') diff --git a/kernel/sched/features.h b/kernel/sched/features.h new file mode 100644 index 000000000000..84802245abd2 --- /dev/null +++ b/kernel/sched/features.h @@ -0,0 +1,70 @@ +/* + * 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) + +/* + * Place new tasks ahead so that they do not starve already running + * tasks + */ +SCHED_FEAT(START_DEBIT, 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) + +/* + * 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) + +/* + * 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) + +/* + * Decrement CPU power based on time not spent running tasks + */ +SCHED_FEAT(NONTASK_POWER, 1) + +/* + * Queue remote wakeups on the target CPU and process them + * using the scheduler IPI. Reduces rq->lock contention/bounces. + */ +SCHED_FEAT(TTWU_QUEUE, 1) + +SCHED_FEAT(FORCE_SD_OVERLAP, 0) +SCHED_FEAT(RT_RUNTIME_SHARE, 1) -- cgit v1.2.3-58-ga151