Messages in this thread | | | Date | Sun, 9 Jul 2000 14:11:09 -0300 (BRT) | From | Marcelo Tosatti <> | Subject | Swap clustering with new VM |
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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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