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    SubjectSwap clustering with new VM

    On Thu, 6 Jul 2000, Stephen C. Tweedie wrote:

    <snip>

    > For example, our swap clustering relies on allocating
    > sequential swap addresses to sequentially scanned VM addresses, so
    > that clustered swapout and swapin work naturally. Switch to
    > physically-ordered swapping and there's no longer any natural way of
    > getting the on-disk swap related to VA ordering, so that swapin
    > clustering breaks completely. To fix this, you need the final swapout
    > to try to swap nearby pages in VA space at the same time. It's a lot
    > of work to get it right.

    AFAIK XFS's pagebuf structure contains a list of contiguous on-disk
    buffers, so the filesystem can do IO on a pagebuf structure avoiding disk
    seek time.

    Do you plan to fix the swap clustering problem with a similar idea?



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