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    SubjectRe: [PATCH V2 0/6] VA to numa node information
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    On 09/14/2018 11:04 AM, Prakash Sangappa wrote:
    > Also, for valid VMAs in 'maps' file, if the VMA is sparsely
    > populated with physical pages, the page walk can skip over non
    > existing page table entires (PMDs) and so can be faster.
    Note that this only works for things that were _never_ populated. They
    might be sparse after once being populated and then being reclaimed or
    discarded. Those will still have all the page tables allocated.

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