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    SubjectRe: REGRESSION: Performance regressions from switching anon_vma->lock to mutex
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    On Fri, 2011-06-17 at 11:01 -0700, Linus Torvalds wrote:

    > So I do think that "page_referenced_anon()" should do a trylock, and
    > return "referenced" if the trylock fails. Comments?

    The only problem I can immediately see with that is when a single
    process' anon memory is dominant, then such an allocation will never
    succeed in freeing these pages because the one lock will pin pretty much
    all anon. Then again, there's always a few file pages to drop.

    That said, its rather unlikely, and iirc people were working on removing
    direct reclaim, or at least rely less on it.





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