Re: [patch] Real-Time Preemption, -RT-2.6.12-rc1-V0.7.43-00

[Ingo Molnar <mingo@elte.hu>]

* Esben Nielsen <simlo@phys.au.dk> wrote:

> > Now the question is, who will fix it? Preferably the maintainers, but I
> > don't know how much of a priority this is to them. I don't have the time
> > now to look at this and understand enough about the code to be able to
> > make a proper fix, and I'm sure you have other things to do too.
> 
> How about adding a
>  if(rt_task(current)) {
>         WARN_ON(1);
>         mutex_setprio(current, MAX_PRIO-1)
>  }
> ?
> 
> to find all calls to yields from rt-tasks. That will force the user 
> (aka the real-time developer) to either stop calling the subsystems 
> still using yield from his RT-tasks, or fix those subsystems.

i've added this to the -43-08 patch, so that we can see the scope of the 
problem. But any yield() use could become a problem due to priority 
inheritance. (which might eventually be expanded to userspace locking 
too)

	Ingo
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