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    SubjectRe: [PATCH] Rmap speedup
    Daniel Phillips wrote:
    >
    > This patch eliminates about 35% of the raw rmap setup/teardown overhead by
    > adopting a new locking interface that allows the add_rmaps to be batched in
    > copy_page_range.

    Well that's fairly straightforward, thanks. Butt-ugly though ;)

    Don't bother doing teardown yet. I have patches which batch
    all the zap_page_range activity into 16-page chunks, so we
    eventually end up in a single function with 16 virtually-contiguous
    pages to release. Adding the batched locking to that will
    be simple.

    Sigh. I have a test which sends the 2.5.30 VM into a five-minute
    coma and which immediately panics latest -ac with pte_chain oom.
    Remind me again why all this is worth it?

    I'll port your stuff to 2.5 over the weekend, let you know...
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