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SubjectRe: fbcon + scrolling = irq timeouts?


Andi Kleen wrote:

> benno@gardena.net (Benno Senoner) writes:
> >
> > An update kernel thread could work as well, but it might be more complicated to
> > implement this, plus you get async updates instead of sync updates which is not
> > really desired.
> >
> > correct me if I'm wrong.
>
> Only processes in user mode get preemptive scheduling, so even a kernel
> thread won't safe you from inserting the required schedule()s in the kernel
> code (except when you go rtlinux)
>
> -Andi
>

Yep, you are right I forgot this completely, that's why Ingo in his low-latency
patch
shortened the execution paths, and inserted rescheduling hookups.
This scheduling remembers me windoze's 3.11 "cooperative" multitasking.
:-)

Benno.



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