Re: [patch]2.4.0-test6 "spinlock" preemption patch

From: Andrew Morton (
Date: Wed Sep 06 2000 - 08:23:07 EST

George Anzinger wrote:
> This patch, for 2.4.0-test6, allows the kernel to be built with full
> preemption.

Neat. Congratulations.

> ...
> The measured context switch latencies with this patch
> have been as high as 12 ms, however, we are actively working to
> isolate and fix the areas of the system where this occurs.

That has already been done! From memory, there are three long-lived
spinlocks which affect latency. Try applying

Also, review Ingo's ll-patch. He may have picked up on some extra
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