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    SubjectRe: [PATCH] vmscan: evict use-once pages first (v2)
    Andrew Morton wrote:
    > On Fri, 01 May 2009 10:05:53 -0400
    > Rik van Riel <riel@redhat.com> wrote:

    >> This means we need to provide our working set protection
    >> on a per-list basis, by tweaking the scan rate or avoiding
    >> scanning of the active file list alltogether under certain
    >> conditions.
    >>
    >> As a side effect, this will help protect frequently accessed
    >> file pages (good for ftp and nfs servers), indirect blocks,
    >> inode buffers and other frequently used metadata.
    >
    > Yeah, but that's all internal-implementation-of-the-day details. It
    > just doesn't matter how the sausages are made. What we have learned is
    > that the policy of retaining mapped pages over unmapped pages, *all
    > other things being equal* leads to a more pleasing system.

    Well, retaining mapped pages is one of the implementations
    that lead to a more pleasing system.

    I suspect that a fully scan resistant active file list will
    show the same behaviour, as well as a few other desired
    behaviours that come in very handy in various server loads.

    Are you open to evaluating other methods that could lead, on
    desktop systems, to a behaviour similar to the one achieved
    by the preserve-mapped-pages mechanism?

    --
    All rights reversed.


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