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    SubjectRe: [PATCH 0/7] mm: faster get user pages
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    On 09/19/2018 02:02 PM, Keith Busch wrote:
    > Pinning user pages out of nvdimm dax memory is significantly slower
    > compared to system ram. Analysis points to software overhead incurred
    > from a radix tree lookup. This patch series fixes that by removing the
    > relatively costly dev_pagemap lookup that was repeated for each page,
    > significantly increasing gup time.

    Could you also remind us why DAX pages are such special snowflakes and
    *require* radix tree lookups in the first place?

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