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    SubjectRe: [patch 3/9] Guest page hinting: volatile page cache.
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    On Fri, 2006-09-01 at 19:42 +0200, Martin Schwidefsky wrote: 
    > The problem of page discard vs. normal page remove is that the page can
    > be remove and discarded at the same time. Both sides are writers in the
    > sense that they want to remove the page from page cache. RCU doesn't not
    > help with that kind of race.

    OK. It comes down to a race between

    __remove_from_page_cache()/__delete_from_swap_cache()

    and

    __page_discard()

    running on the same page at the same time. Right?

    -- Dave

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