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    SubjectRe: RFC: COW for hugepages
    On Wed, 7 Apr 2004 17:42:39 +1000
    David Gibson <> wrote:

    > Currently the kernel does not implement copy-on-write for huge pages -
    > in fact any sort of page fault on a hugepage results in a SIGBUS.
    > This means that hugepages *always* have MAP_SHARED semantics, even if
    > MAP_PRIVATE is requested, and in particular that they are always
    > shared across a fork(). Particularly when using hugetlbfs as just a
    > source of quasi-anonymous memory, those are rather strange semantics.


    Implementing this for ppc64 only is just wrong. Before you do this
    I would suggest to factor out the common code in the various hugetlbpage
    implementations and then implement it in common code.

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