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    SubjectRe: [PATCH 1/6] mm: make mm->pinned_vm an atomic64 counter
    On Mon, 21 Jan 2019, Davidlohr Bueso wrote
    > Taking a sleeping lock to _only_ increment a variable is quite the
    > overkill, and pretty much all users do this. Furthermore, some drivers
    > (ie: infiniband and scif) that need pinned semantics can go to quite
    > some trouble to actually delay via workqueue (un)accounting for pinned
    > pages when not possible to acquire it.

    Reviewed-by: Christoph Lameter <cl@linux.com>

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