On 10/07/2013 06:28 AM, Mel Gorman wrote:
> PTE scanning and NUMA hinting fault handling is expensive so commit
> 5bca2303 ("mm: sched: numa: Delay PTE scanning until a task is scheduled
> on a new node") deferred the PTE scan until a task had been scheduled on
> another node. The problem is that in the purely shared memory case that
> this may never happen and no NUMA hinting fault information will be
> captured. We are not ruling out the possibility that something better
> can be done here but for now, this patch needs to be reverted and depend
> entirely on the scan_delay to avoid punishing short-lived processes.
>
> Signed-off-by: Mel Gorman <mgorman@xxxxxxx>
Reviewed-by: Rik van Riel <riel@xxxxxxxxxx>
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