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SubjectRe: [PATCH] sched/numa: Avoid trapping faults and attempting migration of file-backed dirty pages
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 <>

Reviewed-by: Rik van Riel <>

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