On Mon, 2018-06-04 at 15:30 +0530, Srikar Dronamraju wrote: > Task migration under numa balancing can happen in parallel. More than > one task might choose to migrate to the same cpu at the same time. > This > can result in > - During task swap, choosing a task that was not part of the > evaluation. > - During task swap, task which just got moved into its preferred > node, > moving to a completely different node. > - During task swap, task failing to move to the preferred node, will > have > to wait an extra interval for the next migrate opportunity. > - During task movement, multiple task movements can cause load > imbalance. > > This problem is more likely if there are more cores per node or more > nodes in the system. > > Use a per run-queue variable to check if numa-balance is active on > the > run-queue.
> Signed-off-by: Srikar Dronamraju <sri...@linux.vnet.ibm.com> > Reviewed-by: Rik van Riel <r...@surriel.com> -- All Rights Reversed.
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