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    SubjectRe: [PATCH] vma limited swapin readahead

    On Thu, Feb 01, 2001 at 02:45:04PM -0200, Rik van Riel wrote:
    > On Thu, 1 Feb 2001, Stephen C. Tweedie wrote:
    > But only when the extra pages we're reading in don't
    > displace useful data from memory, making us fault in
    > those other pages ... causing us to go to the disk
    > again and do more readahead, which could potentially
    > displace even more pages, etc...

    Remember, it's a balance. You can displace a few useful pages and
    still win overall because the cost _per page_ goes way down due to
    better disk IO utilisation.

    > One solution could be to put (most of) the swapin readahead
    > pages on the inactive_dirty list, so pressure by readahead
    > on the resident pages is smaller and the not used readahead
    > pages are reclaimed faster.

    Yep, that would make much sense.

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