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    SubjectRe: [RFC][PATCH] Make MAX_RT_PRIO and MAX_USER_RT_PRIO configurable
    On Wed, 27 Jul 2005, Ingo Molnar wrote:

    >
    > * Steven Rostedt <rostedt@goodmis.org> wrote:
    >
    > > Perfectly understood. I've had two customers ask me to increase the
    > > priorities for them, but those where custom kernels, and a config
    > > option wasn't necessary. But since I've had customers asking, I
    > > thought that this might be something that others want. But I deal
    > > with a niche market, and what my customers want might not be what
    > > everyone wants. (hence the RFC in the subject).
    > >
    > > So if there are others out there that would prefer to change their
    > > priority ranges, speak now otherwise this patch will go by the waste
    > > side.
    >
    > i'm not excluding that this will become necessary in the future. We
    > should also add the safety check to sched.h - all i'm suggesting is to
    > not make it a .config option just now, because that tends to be fiddled
    > with.
    >
    Isn't there a way to mark it "warning! warning! dangerous!" ?

    Anyway: I think 100 RT priorities is way overkill - and slowing things
    down by making the scheduler checking more empty slots in the runqueue.
    Default ought to be 10. In practise it will be very hard to have
    a task at the lower RT priority behaving real-time with 99 higher
    priority tasks around. I find it hard to believe that somebody has an RT
    app needing more than 10 priorities and can't do with RR or FIFO
    scheduling within a fewer number of prorities.

    Esben

    > Ingo
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