sched: Make tg_shares_up() walk on-demand
Make tg_shares_up() use the active cgroup list, this means we cannot do a strict bottom-up walk of the hierarchy, but assuming its a very wide tree with a small number of active groups it should be a win. Signed-off-by: Paul Turner <pjt@google.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <20101115234937.754159484@google.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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