sched: Implement on-demand (active) cfs_rq list
Make certain load-balance actions scale per number of active cgroups instead of the number of existing cgroups. This makes wakeup/sleep paths more expensive, but is a win for systems where the vast majority of existing cgroups are idle. Signed-off-by:Paul Turner <pjt@google.com> Signed-off-by:
Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <20101115234937.666535048@google.com> Signed-off-by:
Ingo Molnar <mingo@elte.hu>
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