On Mon, 2018-03-26 at 10:43 +0100, Mel Gorman wrote: > change_pte_range is called from task work context to mark PTEs for > receiving > NUMA faulting hints. If the marked pages are dirty then migration may > fail. > Some filesystems cannot migrate dirty pages without blocking so are > skipped > in MIGRATE_ASYNC mode which just wastes CPU. Even when they can, it > can > be a waste of cycles when the pages are shared forcing higher scan > rates. > Signed-off-by: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx> Reviewed-by: Rik van Riel <riel@xxxxxxxxxxx> -- All Rights Reversed.
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