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    SubjectRe: [PATCH 28/40] autonuma: make khugepaged pte_numa aware
    On 07/12/2012 02:50 PM, Andrea Arcangeli wrote:
    > On Mon, Jul 02, 2012 at 12:24:36AM -0400, Rik van Riel wrote:
    >> On 06/28/2012 08:56 AM, Andrea Arcangeli wrote:
    >>> If any of the ptes that khugepaged is collapsing was a pte_numa, the
    >>> resulting trans huge pmd will be a pmd_numa too.
    >> Why?
    >> If some of the ptes already got faulted in and made really
    >> resident again, why do you want to incur a new NUMA fault
    >> on the newly collapsed hugepage?
    > If we don't set pmd_numa on the collapsed hugepage, the result is that
    > we'll understimate the thread NUMA affinity to the node where the
    > hugepage is located (mm affinity is recorded independently by the NUMA
    > hinting page faults).
    > If it's better or worse I guess depends on luck, we just lose
    > information.

    Fair enough.

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