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From: Daniel Phillips <phillips@bonn-fries.net>
To: Rik van Riel <riel@conectiva.com.br>
Subject: Re: [2.4.17/18pre] VM and swap - it's really unusable
Date: Tue, 8 Jan 2002 22:51:55 +0100
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Cc: Andrew Morton <akpm@zip.com.au>, Anton Blanchard <anton@samba.org>,
        Andrea Arcangeli <andrea@suse.de>,
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        Dieter N?tzel <Dieter.Nuetzel@hamburg.de>,
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        Linux Kernel List <linux-kernel@vger.kernel.org>,
        Robert Love <rml@tech9.net>
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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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