Re: [2.4.17/18pre] VM and swap - it's really unusable
Daniel Phillips (phillips@bonn-fries.net)
Tue, 8 Jan 2002 22:51:55 +0100
On January 8, 2002 10:08 pm, Rik van Riel wrote:
> On Tue, 8 Jan 2002, Daniel Phillips wrote:
>
> > The preemptible kernel can reschedule, on average, sooner than the
> > scheduling-point kernel, which has to wait for a scheduling point to
> > roll around.
>
> The preemptible kernel ALSO has to wait for a scheduling point
> to roll around, since it cannot preempt with spinlocks held.
Think about the relative amount of time spent inside spinlocks vs regular
kernel.
> Considering this, I don't see much of an advantage to adding
> kernel preemption.
And now?
--
Daniel
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