sched: virtual time buddy preemption
Since we moved wakeup preemption back to virtual time, it makes sense to move the buddy stuff back as well. The purpose of the buddy scheduling is to allow a quickly scheduling pair of tasks to run away from the group as far as a regular busy task would be allowed under wakeup preemption. This has the advantage that the pair can ping-pong for a while, enjoying cache-hotness. Without buddy scheduling other tasks would interleave destroying the cache. Also, it saves a word in cfs_rq. Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: NMike Galbraith <efault@gmx.de> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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