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    SubjectRe: [PATCH 10/19] sched/numa: Stop multiple tasks from moving to the cpu at the same time
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    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 <srikar@linux.vnet.ibm.com>
    >

    Reviewed-by: Rik van Riel <riel@surriel.com>
    --
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