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    SubjectRe: [PATCH] [request for inclusion] Realtime LSM
    On Sat, Jan 08, 2005 at 12:12:59AM -0600, Jack O'Quin wrote:
    > Chris Wright <chrisw@osdl.org> writes:
    >
    > > * Christoph Hellwig (hch@infradead.org) wrote:
    > >> So to make forward progress I'd like the audio people to confirm whether
    > >> the mlock bits in 2.6.9+ do help that half of their requirement first
    > >
    > > It sure should, but I guess they can reply on that.
    >
    > That does seem to work now (finally). It looks like that longstanding
    > CAP_IPC_LOCK bug is finally fixed, too.
    >
    > I find it hard to understand why some of you think PAM is an adequate
    > solution.

    The best we can do _here_ is present something that userspace can use
    sensibly. We can't make userspace actually use it that way though.

    Rlimits are neither UID/GID or PAM-specific. They fit well within
    the general model of UNIX security, extending an existing mechanism
    rather than adding a completely new one. That PAM happens to be the
    way rlimits are usually administered may be unfortunate, yes, but it
    doesn't mean that rlimits is the wrong way.

    > Running `nice --20' is still significantly worse than SCHED_FIFO, but
    > not the unmitigated disaster shown in the middle column. But, this
    > improved performance is still not adequate for audio work. The worst
    > delay was absurdly long (~1/2 sec).

    Let's work on that. It'd be _far_ better to have unprivileged near-RT
    capability everywhere without potential scheduling DoS.

    --
    Mathematics is the supreme nostalgia of our time.
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