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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2008-10-24 11:06:16 +0200
committerIngo Molnar <mingo@elte.hu>2008-10-24 12:51:03 +0200
commit3f3a490480d8ab96e0fe30a41f80f14e6a0c579d (patch)
treeaddbfb1207d816b1e1f5e4ab75f95a08c7b15202 /Documentation/scheduler
parent464b75273f64be7c81fee975bd6ca9593df3427b (diff)
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: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Mike Galbraith <efault@gmx.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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