| Date | Mon, 07 Oct 2013 13:42:57 -0400 | From | Rik van Riel <> | Subject | Re: [PATCH 15/63] Revert "mm: sched: numa: Delay PTE scanning until a task is scheduled on a new node" |
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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@suse.de>
Reviewed-by: Rik van Riel <riel@redhat.com>
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