Swap clustering with new VM

[Marcelo Tosatti <marcelo@conectiva.com.br>]

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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