• Andrea Arcangeli's avatar
    mm: numa: pte_numa() and pmd_numa() · be3a7284
    Andrea Arcangeli authored
    Implement pte_numa and pmd_numa.
    
    We must atomically set the numa bit and clear the present bit to
    define a pte_numa or pmd_numa.
    
    Once a pte or pmd has been set as pte_numa or pmd_numa, the next time
    a thread touches a virtual address in the corresponding virtual range,
    a NUMA hinting page fault will trigger. The NUMA hinting page fault
    will clear the NUMA bit and set the present bit again to resolve the
    page fault.
    
    The expectation is that a NUMA hinting page fault is used as part
    of a placement policy that decides if a page should remain on the
    current node or migrated to a different node.
    Acked-by: default avatarRik van Riel <riel@redhat.com>
    Signed-off-by: default avatarAndrea Arcangeli <aarcange@redhat.com>
    Signed-off-by: default avatarMel Gorman <mgorman@suse.de>
    be3a7284
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