Re: [RFC PATCH] preempt: Add a generic function to return the preemption string.

[Sebastian Andrzej Siewior <bigeasy@linutronix.de>]

On 2025-01-09 15:54:08 [+0100], Peter Zijlstra wrote:
> On Thu, Jan 09, 2025 at 03:41:24PM +0100, Sebastian Andrzej Siewior wrote:
> > On 2025-01-09 15:37:01 [+0100], Peter Zijlstra wrote:
> > > Upgrade brain. Also the proposed thing was just plain wrong.
> > 
> > Was it?
> 
> Yes, things like:
> 
> > +             if (preempt_model_voluntary())
> > +                     return "VOLUNTARY+LAZY";
> > +             if (preempt_model_none())
> > +                     return "NONE+LAZY";
> 
> don't exist and make no sense.

point taken.

> > For the !DYNAMIC case everything should be optimized away except
> > for the current case.
> > Let me try your thing to see what is different…
> 
> For the various cases it was supposed to print something like so:
> 
> RT+DYN:	 PREEMPT_{RT,(dyn_mode)}
> RT+LAZY: PREEMPT_{RT,LAZY}
> RT+FULL: PREEMPT_RT
> 
> DYN:       PREEMPT_(dyn_mode)
> FULL:      PREEMPT
> LAZY:      PREEMPT_LAZY
> VOLUNTARY: VOLUNTARY
> NONE:      NONE

Good. I do like it. Let me make a patch.

Sebastian