On Mar 6, 2007, at 5:03 PM, Jason Thorpe wrote:

>
> On Mar 6, 2007, at 10:17 AM, Matt Thomas wrote:
>
>> I'd like a portion of kernel above real time as well at below.
>>
>> 192 - 255       Interrupt (64)
>> 160 - 191    Kernel high (32)
>> 96 - 159        Real time (64)
>> 64 - 95         Kernel low (32)
>> 0 - 63          User (64)
>
> If the goal is to have kernel real-time threads, then let's call it  
> like it is:
>
> 192 - 255     Interrupt (64)
> 160 - 191     Kernel real-time (32)
>  96 - 159     User real-time (64)
>  64 -  95     Kernel
>   0 -  63     User (64)
>
> That said, I'm a bit uneasy with "user process with real-time  
> threads can starve kernel threads".

which is why I wanted kernel realtime.  Note that the recently  
committed OSK5912 support in evbarm supports 160 interrupt sources,  
so having lots of interrupt priorities gives a lot of flexibility on  
those interrupts.