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    SubjectRe: What to expect with the 2.6 VM
    Andrea Arcangeli wrote:
    > so you agree it'd better be a separate syscall

    Per-page protections might be workable just through mremap(). As you
    say, it's just a matter of appropriate bits in the swap entry. To
    userspace it is a transparent performance improvement.

    Unfortunately without an appropriate bit in the pte too, that
    restricts per-page protections to work only with shared mappings, or
    anon mappings which have not been forked, due to the lack of COW. It
    would still be a good optimisation, although it would be a shame if,
    say, a GC implementation of malloc et al. (eg. Boehm's allocator)
    would not be transparent over fork().

    -- Jamie
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