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    SubjectRe: ~500 megs cached yet 2.6.5 goes into swap hell
    Andrew Morton wrote:
    > 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.


    Sweet. I'm so happy you added posix_fadvise (way back when), and even
    happier to hear this.

    Does our fadvise support len==0 ("I mean the whole file")? That's
    defined in POSIX, and would allow a compliant app to simply
    POSIX_FADV_DONTNEED once at the beginning.

    Jeff



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