>>>>> "Alan" == Alan Cox <alan@lxorguk.ukuu.org.uk> writes:
Oliver> You can have an rt task block on a lock held by a normal task that was
Oliver> preempted by a rt task of lower priority. The same problem as with the
Oliver> sched_idle patches.
>>
>> This can happen with a non-preemptible kernel too. And it has nothing to
>> do with scheduling policy.
Alan> So why bother adding pre-emption. As you keep saying - it doesnt
Alan> gain anything
Nope. I don't. I said (at least in the above) it didn't hurt.
One can consider a non-preemptible kernel as a special kind of
priority inversion, preemptible kernel will eliminate _that_ case of
priority inversion.
Regards,
-velco
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This archive was generated by hypermail 2b29 : Tue Jan 15 2002 - 21:00:48 EST