Re: [RFC][PATCH] Make MAX_RT_PRIO and MAX_USER_RT_PRIO configurable

[Esben Nielsen <simlo@phys.au.dk>]

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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