sched: Ensure update_cfs_shares() is called for parents of continuously-running tasks
We typically update a task_group's shares within the dequeue/enqueue path. However, continuously running tasks sharing a CPU are not subject to these updates as they are only put/picked. Unfortunately, when we reverted f269ae04 (in 17bc14b7), we lost the augmenting periodic update that was supposed to account for this; resulting in a potential loss of fairness. To fix this, re-introduce the explicit update in update_cfs_rq_blocked_load() [called via entity_tick()]. Reported-by: NMax Hailperin <max@gustavus.edu> Signed-off-by: NPeter Zijlstra <peterz@infradead.org> Reviewed-by: NPaul Turner <pjt@google.com> Link: http://lkml.kernel.org/n/tip-9545m3apw5d93ubyrotrj31y@git.kernel.org Cc: <stable@kernel.org> Signed-off-by: NIngo Molnar <mingo@kernel.org>
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