On Mon, 2018-06-04 at 15:30 +0530, Srikar Dronamraju wrote: > Since task migration under numa balancing can happen in parallel, > more > than one task might choose to move to the same node at the same time. > This can cause load imbalances at the node level. > > The problem is more likely if there are more cores per node or more > nodes in system. > > Use a per-node variable to indicate if task migration > to the node under numa balance is currently active. > This per-node variable will not track swapping of tasks.
> The commit does cause some performance regression but is needed from > a fairness/correctness perspective. Does it help any "real workloads", even simple things like SpecJBB2005? If this patch only causes regressions, and does not help any workloads, I would argue that it is not in fact needed. -- All Rights Reversed.
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