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 f269ae046 (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: Max Hailperin <[email protected]>
Signed-off-by: Peter Zijlstra <[email protected]>
Reviewed-by: Paul Turner <[email protected]>
Link: http://lkml.kernel.org/n/[email protected]
Cc: <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
1 file changed
