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    SubjectRe: [PATCH] [request for inclusion] Realtime LSM
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    On Fri, 2005-01-07 at 22:10 +0000, Christoph Hellwig wrote:
    > It's not nessecarily a bad idea per, but it doesn't
    > really fit into the model we've been working to. I'd expect quite a few
    > unpleasant devices when a user detects that the distibution had been
    > binding various capabilities to uids/gids behinds his back.
    >

    Point taken, but do keep in mind that this will *certainly* be disabled
    by default, unless you run an audio oriented distro, and we assume those
    people know what they're doing ;-)

    > For that one I really wonder whether the combination of the now actually
    > working nicelevels (see Mingo's post)

    Ingo said "it should work". It currently doesn't, as you can see from
    Jack's post. My concern here is, the semantics of SCHED_FIFO are well
    defined and stable. The highest priority runnable SCHED_FIFO process
    *always* runs. The semantics of "nice -20" apparently change from
    release to release, as you can see. We can't have the scheduler
    deciding to run something else when jackd needs to run because it
    decides jackd is hogging the CPU or whatever. Everyone knows that when
    dealing with realtime constraints the important case is not the average
    but the worst.

    In a live audio situation an xrun storm and a complete system lockup are
    both catastrophic failures.

    Lee

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