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    SubjectRe: the new VMt
    On Tue, Sep 26, 2000 at 11:45:02AM -0600, Erik Andersen wrote:
    [snip]
    > "Overcommit" to me is the same things as Mark Hemment stated earlier in this
    > thread -- the "fact that the system has over committed its memory resources.
    > ie. it has sold too many tickets for the number of seats in the plane, and all
    > the passengers have turned up." Basically any case where too many tickets
    > have been sold (applied to the entire system, and all subsystems).
    [snip]
    > If the Beancounter patch lets the kernel count "passengers", classify them
    > (with user hinting) so the pilot and flight attendants (init, X, or whatever)
    > always stay on the plane, and has some sane predictable mechanism for booting
    > non-priveledged passengers, then I am all for it.

    That's exactly what I'm doing.

    > How does one provide the kernel with hints as to which processes are sacred?
    > Where does one find this beancounter patch? How much weight does it add to
    > the kernel?

    ftp://ftp.sw.com.sg/pub/Linux/people/saw/kernel/user_beancounter/UserBeancounter.html

    The current version has some drawbacks, and one of them is the performance.
    Memory accounting is implemented as a kernel thread which goes through page
    tables of processes (similar to kswapd), and it appears to consume 1-5% of
    CPU (depending on number of processes). I consider it unacceptable, and have
    started reimplementation of the process memory accounting from the beginning.

    Best regards
    Andrey
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