Messages in this thread | | | Subject | Re: [2.4.17/18pre] VM and swap - it's really unusable | From | Momchil Velikov <> | Date | 15 Jan 2002 00:34:01 +0200 |
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>>>>> "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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