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    SubjectRe: ~500 megs cached yet 2.6.5 goes into swap hell
    Andy Isaacson <adi@hexapodia.org> wrote:
    >
    > But in a related case, I have a background daemon that does a lot of IO
    > (mostly sequential, one page at a time read/modify/write of a multi-GB
    > file) to a filesystem on a separate spindle from my main filesystems.
    > I'd like to use a similar mechanism to say "don't let this program eat
    > my pagecache" that will let the daemon crunch away without severely
    > impacting my desktop work.

    fadvise(POSIX_FADV_DONTNEED) is ideal for this. Run it once per megabyte
    or so.
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