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    SubjectRe: [PATCH 5/5] extend KSM refcounts to the anon_vma root
    On 05/27/2010 10:02 AM, Minchan Kim wrote:

    > Hmm, I can understand this point.
    > Now, rmap code always depeneds on root anon_vma's lock.
    > I think it doesn't depends on KSM and MIGRATION.
    >
    > If we don't use KSM and MIGRATION and it is compiled out,
    > Can root's anon_vma disappear during rmap walking?
    > who prevent it?
    >
    > What am I missing?

    unlink_anon_vmas walks the list in the order from newest
    to oldest, ie. the root always gets unlinked (and potentially
    freed) last.

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